WO2020063930A9

WO2020063930A9 - Reference signal sending and receiving method and apparatus

Info

Publication number: WO2020063930A9
Application number: PCT/CN2019/108770
Authority: WO
Inventors: 费永强; 郭志恒; 谢信乾
Original assignee: 华为技术有限公司
Priority date: 2018-09-28
Filing date: 2019-09-27
Publication date: 2020-08-13
Also published as: WO2020063930A1

Abstract

Provided by the present application are a reference signal sending and receiving method and an apparatus, which are used to provide a method for measuring between base stations. The method comprises: base station 1 sending a reference signal to base station 2 on a second resource, wherein the second resource comprises M continuous downlink OFDM symbols; in the M continuous downlink OFDM symbols, a reference signal carried between any two adjacent OFDM symbols satisfies cyclic characteristics on the time domain, or a phase difference value between reference signals carried on sub-carriers of any two OFDM symbols has a linear relationship with a sub-carrier index; base station 2 determining a first resource for receiving the reference signal, the first resource comprising an uplink OFDM symbol and/or a guard interval, and base station 2 receiving the reference signal on the first resource.

Description

Method and device for sending and receiving reference signal

Cross references to related applications

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on September 28, 2018, with application number 201811143498.1, and the application title is "a method and device for sending and receiving a reference signal", the entire content of which is incorporated by reference In this application; this application claims the priority of a Chinese patent application filed with the Chinese Patent Office, the application number is 201910020561.0, and the application title is "a method and device for sending and receiving a reference signal" on January 9, 2019. The entire content is incorporated into this application by reference.

Technical field

This application relates to the field of communication technology, and in particular to a method and device for sending and receiving reference signals.

Background technique

In wireless communication systems, such as new radio (NR), long term evolution (LTE), and evolved LTE (LTE advanced, LTE-A), if the system uses time division duplex (time division duplex), In duplex (TDD) duplex mode, cross-link interference (CLI) may occur between a base station (base station, BS) and the base station. The so-called non-directional interference between base stations mainly refers to that a downlink (DL) signal sent by a base station interferes with an uplink (UL) signal of another base station. The uplink signal may be, for example, user equipment (UE). The signal sent to the base station. For example, when the first base station is sending a downlink signal, the second base station is receiving an uplink signal. The downlink signal sent by the first base station generally has a relatively high power and may be received by the second base station, which will interfere with the second base station's receiving uplink signal.

The CLI between base stations usually occurs when two TDD cells working on the same frequency have different transmission directions. Therefore, if the transmission direction of the TDD cell is the same, the CLI will usually not be generated. But there are exceptions: two base stations that are geographically separated, even if they have the same transmission direction (that is, receive uplink/send downlink signals at the same time), but due to the long distance between them, the downlink signal sent by one base station It has already passed a significant time delay when reaching another base station. At this time, another base station has switched from the downlink transmission direction to the uplink reception direction. Therefore, the downlink signal of the remote base station interferes with the reception of the uplink signal of the local base station, which means that CLI.

The ultra-long-distance interference between base stations is usually caused by the phenomenon of tropospheric bending; whether the interference between base stations, the interference distance and the time delay are affected by geographical location and weather, there is great uncertainty. In order to combat ultra-long-distance interference, methods such as interfering stations can be used to reduce the transmission power and the number of downlink symbols sent by the interfering station. However, before implementing the interference reduction scheme, it is necessary to perform measurements between base stations to identify the existence of ultra-long-distance interference, or Identify the interfering base station.

In NR, there is currently no standardization of reference signals used for measurement between NR base stations (gNodeB, gNB), that is, between gNB and gNB, and there is no standardization of related measurement procedures.

Summary of the invention

This application provides a method and device for sending and receiving a reference signal to provide a reference signal for measurement between NR base stations.

In the first aspect, an embodiment of the present application provides a method for sending a reference signal. The method may be executed by a network device, including:

Sending reference signals carried on M consecutive orthogonal frequency division multiplexing OFDM symbols;

Wherein, among the M consecutive OFDM symbols, the difference between the phase of the reference signal carried on the first subcarrier of the first OFDM symbol and the phase of the reference signal carried on the first subcarrier of the second OFDM symbol The phase difference is determined by the index of the first subcarrier, where the first OFDM symbol and the second OFDM symbol are any two OFDM symbols among the M consecutive OFDM symbols, and M is greater than or equal to 2 Integer.

The above solution provides a method for measuring between base stations, and the reference signals carried by different OFDM symbols meet the cyclic characteristics, so that the receiver can obtain a complete reference signal within a detection window when detecting the reference signal.

In a possible design, it further includes: among the M consecutive OFDM symbols, the phase of the reference signal carried on the first subcarrier of the first OFDM symbol and the first subcarrier carried on the second OFDM symbol The phase difference between the phases of the reference signals on the above is w1, the phase of the reference signal carried on the second subcarrier of the first OFDM symbol and the reference signal carried on the second subcarrier of the second OFDM symbol The phase difference between the phases of the signals is w2, the phase of the reference signal carried on the third subcarrier of the first OFDM symbol and the phase of the reference signal carried on the third subcarrier of the second OFDM symbol The phase difference between is w3, the difference between the phase of the reference signal carried on the fourth subcarrier of the first OFDM symbol and the phase of the reference signal carried on the fourth subcarrier of the second OFDM symbol The phase difference is w4; if the difference between the index of the second subcarrier and the index of the first subcarrier is equal to the difference between the index of the fourth subcarrier and the index of the third subcarrier, then (w2-w1) modulo 2π It is equal to the value of (w4-w3) mod 2π.

Through the above design, the linear relationship between the phase difference and the subcarrier index between different OFDMs is satisfied, so that the reference signals carried by different OFDM symbols meet the cyclic characteristics, so that the receiver can obtain a complete reference signal within a detection window.

In a possible design, the phase difference between the phase of the reference signal carried on the first subcarrier of the first OFDM symbol and the phase of the reference signal carried on the first subcarrier of the second OFDM symbol is also determined by The symbol length of the OFDM symbol and/or the cyclic prefix CP length of the OFDM symbol are determined.

Through the above design, the phase difference is determined based on the subcarrier index, the symbol length of the OFDM symbol, and/or the cyclic prefix CP length of the OFDM symbol, so that the reference signals carried by different OFDM symbols meet the cyclic characteristics, so that the receiver is in a detection window A complete reference signal can be obtained.

In a possible design, the first OFDM symbol and the second OFDM symbol are separated by X OFDM symbols, the first OFDM symbol is earlier than the second OFDM symbol in the time domain, and the X is greater than or An integer equal to 0; the CP length of the OFDM symbol is determined by the CP length of the X OFDM symbols and the CP length of the second OFDM symbol.

The above design provides a relationship between reference signals carried by different OFDM symbols when the cyclic characteristics are satisfied.

In a possible design, among the M consecutive OFDM symbols, any two adjacent OFDM symbols, the phase of the reference signal carried on the first subcarrier of the next OFDM symbol and the phase of the reference signal carried on the previous OFDM symbol The phase difference between the phases of the reference signals on the first subcarrier of the symbol is 2πLk/N, where N is the symbol length of the OFDM symbol, L is the CP length of the OFDM symbol, and k is the first subcarrier index.

The above-mentioned design provides a method for determining the phase difference between the reference signals carried by adjacent OFDM symbols, so that the reference signals carried by different OFDM symbols meet the cyclic characteristics, so that the receiver can obtain a complete reference within a detection window signal.

In a possible design, among the M consecutive OFDM symbols, the phase of the reference signal carried on the first subcarrier of the uth OFDM symbol and the phase of the reference signal carried on the first subcarrier of the vth OFDM symbol The phase difference between the phases of the reference signal is

Where N is the symbol length of the OFDM symbol, Ln is the CP length of the nth OFDM symbol, u is an integer greater than 1 and less than or equal to M, v is an integer greater than or equal to 1 and less than u, k Is the index of the first subcarrier.

The above-mentioned design provides a method for determining the phase difference between the reference signals carried by different OFDM symbols, so that the reference signals carried by different OFDM symbols meet the cyclic characteristics, so that the receiver can obtain a complete reference within a detection window signal.

In a possible design, the M consecutive OFDM symbols are the last M OFDM symbols of the downlink transmission part of the uplink-downlink switching period.

The above design, on the one hand, can determine the maximum range of interference, because the RS is already the last N symbols of the downlink transmission, so after the receiver detects the RS, it can determine that the range after the time domain position of the RS is not affected by the sender Therefore, interference cancellation measures can be further applied, such as lower-order modulation, lower code rate, etc., for the area interfered by CLI; on the other hand, the detection success rate can be guaranteed to the greatest extent.

In a possible design, the reference signal is carried on K subcarriers, K≤Kmax, Kmax is the maximum number of subcarriers in the system; through the above design, the same OFDM symbol can not only carry the reference signal, but also other Signals, such as data signals, enable base stations to perform channel measurement between base stations and also perform data transmission between base stations and user equipment in the same time.

In a second aspect, the embodiments of the present application provide a method for receiving a reference signal. The method may be executed by a network device. The method includes: determining a first resource for receiving a reference signal, where the first resource includes uplink OFDM symbols and/ Or guard interval; receiving a reference signal on the first resource; the reference signal is sent through a second resource, and the second resource includes M consecutive downlink OFDM symbols; wherein, the M consecutive downlink OFDM symbols In an OFDM symbol, the phase difference between the phase of the reference signal carried on the first subcarrier of the first OFDM symbol and the phase of the reference signal carried on the first subcarrier of the second OFDM symbol is determined by the phase difference of the first subcarrier. The index is determined, where the first OFDM symbol and the second OFDM symbol are OFDM symbols of any two of the M consecutive downlink OFDM symbols, and M is an integer greater than or equal to 2.

In one possible design, it also includes:

In the M consecutive OFDM symbols, the phase difference between the phase of the reference signal carried on the first subcarrier of the first OFDM symbol and the phase of the reference signal carried on the first subcarrier of the second OFDM symbol Is w1, the phase difference between the phase of the reference signal carried on the second subcarrier of the first OFDM symbol and the phase of the reference signal carried on the second subcarrier of the second OFDM symbol is w2, The phase difference between the phase of the reference signal carried on the third subcarrier of the first OFDM symbol and the phase of the reference signal carried on the third subcarrier of the second OFDM symbol is w3, which is carried on the The phase difference between the phase of the reference signal on the fourth subcarrier of the first OFDM symbol and the phase of the reference signal carried on the fourth subcarrier of the second OFDM symbol is w4;

If the difference between the index of the second subcarrier and the index of the first subcarrier is equal to the difference between the index of the fourth subcarrier and the index of the third subcarrier, then the value of (w2-w1) mod 2π is equal to (w4-w3 ) The value modulo 2π.

In a third aspect, the embodiments of the present application provide a method for sending a reference signal, which may be executed by a network device, including: sending a reference signal carried on M consecutive orthogonal frequency division multiplexing OFDM symbols; wherein, Among the M consecutive OFDM symbols, any two adjacent OFDM symbols in the time domain, the reference signal carried by the part excluding the CP on the latter OFDM symbol and the reference signal carried by the part excluding the CP on the previous OFDM symbol The signals obtained by cyclic shifting the signals are the same, and the length of the cyclic shift is determined by the cyclic prefix CP length of the OFDM symbol.

The above solution provides a method for measuring between base stations. The cyclic shift characteristics are satisfied between two adjacent OFDM symbols, so that the reference signals carried by different OFDM symbols meet the cyclic characteristics, so that the receiver can detect the reference A complete reference signal can be obtained in a detection window.

In a possible design, the CP length of the OFDM symbol is the CP length of the last OFDM symbol among the two adjacent OFDM symbols.

In a possible design, among M consecutive OFDM symbols, the reference signal carried by the part of the u-th OFDM symbol excluding the CP and the reference signal carried by the part excluding the CP of the v-th OFDM symbol are performed (uv)·L long The signals obtained by the cyclic shift of are the same, u is an integer greater than 1 and less than or equal to M, v is an integer greater than or equal to 1 and less than u, and L is the CP length of the OFDM symbol.

In the above design, the cyclic shift characteristics are satisfied between any two OFDM symbols, so that the reference signals carried by different OFDM symbols meet the cyclic characteristics, so that the receiver can obtain a complete reference signal within a detection window.

In a possible design, among the M consecutive OFDM symbols, the reference signal carried by the part excluding the CP of the u-th OFDM symbol is performed with the reference signal carried by the part excluding the CP of the v-th OFDM symbol.

The signals obtained by the long cyclic shift are the same, Ln is the CP length of the nth OFDM symbol, u is an integer greater than 1 and less than or equal to M, and v is an integer greater than or equal to 1 and less than u.

In a fourth aspect, an embodiment of the present application provides a method for receiving a reference signal. The method may be executed by a network device. The method includes: determining a first resource for receiving a reference signal, where the first resource includes uplink OFDM symbols and/ Or guard interval; receiving a reference signal on the first resource; the reference signal is sent through a second resource, and the second resource includes M consecutive downlink OFDM symbols; wherein, the M consecutive OFDM symbols In the symbol, any two adjacent OFDM symbols, in the time domain, are obtained by cyclically shifting the reference signal carried by the part excluding the CP on the latter OFDM symbol and the reference signal carried by the part excluding the CP on the previous OFDM symbol The signal is the same, and the length of the cyclic shift is determined by the cyclic prefix CP length of the OFDM symbol.

In the fifth aspect, the embodiments of the present application provide a method for receiving a reference signal. The method may be executed by a network device, including:

Determine the first resource for receiving the reference signal according to the obtained first information; wherein the first information includes time domain resource and/or frequency domain resource location information used to carry the reference signal; receiving on the first resource Reference signal.

In the above solution, for the base stations that are close to each other, since the signal transmission delay is negligible, the sending time of the sending end can be regarded as the receiving time of the receiving end. Therefore, the receiving end can know in advance the location of the resource carrying the reference signal (that is, the sending end). The resource location for sending the reference signal), thereby receiving the reference signal received at the determined resource location. Then perform channel measurement according to the reference signal, or determine the interfering base station.

In a possible design, the method further includes: obtaining second information, where the second information includes the reference signal, or parameter information required to generate the reference signal; The reference signal is received on a resource, or channel estimation is performed according to the second information and the received reference signal.

In a possible design, the first resource includes a guard time interval, or the first resource includes M downlink OFDM symbols.

In a sixth aspect, an embodiment of the present application provides a method for sending a reference signal, including:

Send reference signals carried on Z consecutive basic resources; the basic resources include Y consecutive third orthogonal frequency division multiplexing OFDM symbols, and a cyclic prefix CP and/or a cyclic suffix CS; among them, one The reference signals carried on the Y third OFDM symbols included in the basic resources are the same; the third OFDM symbols do not include CP;

Wherein, in the Z consecutive basic resources, the phase of the reference signal carried on the first subcarrier of the first basic resource and the phase of the reference signal carried on the first subcarrier of the second basic resource are between The phase difference is determined by the index of the first subcarrier, where the first basic resource and the second basic resource are any two basic resources among the Z consecutive basic resources, and Z and Y are greater than or equal to An integer of 2.

Exemplarily, the length of the basic resource is equal to the sum of the lengths of Y fourth OFDM symbols, and the fourth OFDM symbol includes a CP.

Exemplarily, the symbol lengths of the third OFDM symbol and the fourth OFDM symbol are equal, that is, the third OFDM symbol is equal to the fourth OFDM symbol after removing the CP and/or CS.

In one possible design, it also includes:

In the Z consecutive basic resources, the phase difference between the phase of the reference signal carried on the first subcarrier of the first basic resource and the phase of the reference signal carried on the first subcarrier of the second basic resource Is w1, the phase difference between the phase of the reference signal carried on the second subcarrier of the first basic resource and the phase of the reference signal carried on the second subcarrier of the second basic resource is w2, The phase difference between the phase of the reference signal carried on the third subcarrier of the first basic resource and the phase of the reference signal carried on the third subcarrier of the second basic resource is w3, which is carried on all The phase difference between the phase of the reference signal on the fourth subcarrier of the first basic resource and the phase of the reference signal carried on the fourth subcarrier of the second basic resource is w4;

In a possible design, when the basic resource only includes Y consecutive third OFDM symbols and one CP, the phase of the reference signal carried on the first subcarrier of the first basic resource is different from the phase of the reference signal carried on the second subcarrier. The phase difference between the phases of the reference signals on the first subcarrier of the basic resource is also determined by the symbol length of the third OFDM symbol and/or the CP length of the basic resource.

In a possible design, the first basic resource and the second basic resource are separated by X basic resources, the first basic resource is earlier than the second basic resource in the time domain, and the X is greater than or An integer equal to 0; the CP length of the basic resource is determined by the CP length of the X basic resources and the CP length of the second basic resource.

In a possible design, when the basic resource includes only Y consecutive third OFDM symbols and a cyclic prefix CP, any two adjacent basic resources among the Z consecutive basic resources, The phase difference between the phase of the reference signal carried on the first subcarrier of the latter basic resource and the phase of the reference signal carried on the first subcarrier of the previous basic resource is 2πLK/N, where N is the The symbol length of the third OFDM symbol, L is the CP length of the basic resource, and k is the index of the first subcarrier.

In a possible design, when the basic resource only includes Y consecutive third OFDM symbols and a cyclic prefix CP, among the Z consecutive basic resources, the first resource is carried in the u-th basic resource. The phase difference between the phase of the reference signal on a subcarrier and the phase of the reference signal carried on the first subcarrier of the v-th basic resource is

Where N is the symbol length of the third OFDM symbol, Ln is the CP length of the nth basic resource, u is an integer greater than 1 and less than or equal to Z, v is an integer greater than or equal to 1 and less than u , K is the index of the first subcarrier.

In a possible design, when the basic resource only includes Y consecutive third OFDM symbols and one CS, the phase of the reference signal carried on the first subcarrier of the first basic resource is different from the phase of the reference signal carried on the first subcarrier. The phase difference between the phases of the reference signals on the first subcarrier of the two basic resources is further determined by the symbol length of the third OFDM symbol and/or the CS length of the basic resource.

In a possible design, the first basic resource and the second basic resource are separated by X basic resources, the first basic resource is earlier than the second basic resource in the time domain, and the X is greater than or An integer equal to 0; the CS length of the basic resource is determined by the CS length of the X basic resources and the CS length of the first basic resource.

In a possible design, when the basic resource includes only Y consecutive third OFDM symbols and one CS, among the Z consecutive basic resources, any two adjacent basic resources are carried on The phase difference between the phase of the reference signal on the first subcarrier of the latter basic resource and the phase of the reference signal on the first subcarrier of the previous basic resource is 2πJK/N, where N is the third The symbol length of the OFDM symbol, J is the CS length of the basic resource, and k is the index of the first subcarrier.

In a possible design, when the basic resource includes only Y consecutive third OFDM symbols and one CS, among the Z consecutive basic resources, the first sub-group of the u-th basic resource is carried. The phase difference between the phase of the reference signal on the carrier and the phase of the reference signal carried on the first subcarrier of the v-th basic resource is

Where, N is the symbol length of the third OFDM symbol, Jn is the CS length of the n-th basic resource, u is an integer greater than 1 and less than or equal to Z, v is an integer greater than or equal to 1 and less than u , K is the index of the first subcarrier.

In a possible design, when the basic resource includes Y consecutive third OFDM symbols, one CS, and one CP, the phase of the reference signal carried on the first subcarrier of the first basic resource is relative to the phase of the reference signal carried on the first subcarrier. The phase difference between the phases of the reference signals on the first subcarrier of the second basic resource is also determined by the symbol length of the third OFDM symbol, the CS length of the basic resource, and the CP length of the basic resource.

In a possible design, the first basic resource and the second basic resource are separated by X basic resources, the first basic resource is earlier than the second basic resource in the time domain, and the X is greater than or An integer equal to 0; the CS length of the basic resource is determined by the CS length of the X basic resources and the CS length of the first basic resource, and the CP length of the basic resource is determined by the CP length of the X basic resources and The CP length of the second basic resource is determined.

In a possible design, when the basic resources include Y consecutive third OFDM symbols, one CS, and one CP, among the Z consecutive basic resources, any two adjacent basic resources bear The phase difference between the phase of the reference signal on the first subcarrier of the latter basic resource and the phase of the reference signal carried on the first subcarrier of the previous basic resource is 2π(L+J)k/N, Where N is the symbol length of the third OFDM symbol, L is the CP length of the basic resource, J is the CS length of the basic resource, and k is the index of the first subcarrier.

In a possible design, when the basic resources include Y consecutive third OFDM symbols, one CS, and one CP, among the Z consecutive basic resources, the first one carried in the u-th basic resource The phase difference between the phase of the reference signal on the subcarrier and the phase of the reference signal on the first subcarrier carried on the v-th basic resource is

Where N is the symbol length of the third OFDM symbol, Ln is the CP length of the n-th basic resource, Jn is the CS length of the n-th basic resource, u is greater than 1 and less than or equal to Z An integer, v is an integer greater than or equal to 1 and less than u, and k is the index of the first subcarrier.

In a possible design, the Z continuous basic resources are the last Z basic resources in the downlink transmission part of the uplink-downlink switching period.

In a seventh aspect, an embodiment of the present application provides a method for sending a reference signal, including:

Sending reference signals carried on Z consecutive basic resources;

Wherein, the basic resource includes Y consecutive third orthogonal frequency division multiplexing OFDM symbols, and a cyclic prefix CP; wherein, the reference signals carried on the Y third OFDM symbols included in one basic resource are the same ; The third OFDM symbol does not include CP;

Wherein, among the Z consecutive basic resources, any two adjacent basic resources, in the time domain, the reference signal carried on the third OFDM symbol included in the latter basic resource is compared with the third basic resource included in the previous basic resource. The cyclic shift of the reference signal carried on the OFDM symbol results in the same signal, and the length of the cyclic shift is determined by the CP length of the basic resource.

In a possible design, the CP length of the basic resource is the CP length of the latter one of the two adjacent basic resources.

In a possible design, among the Z consecutive basic resources, the reference signal carried on the third OFDM symbol included in the u-th basic resource is performed with the reference signal carried on the third OFDM symbol included in the v-th basic resource. (uv) The signals obtained by the cyclic shift of L length are the same, u is an integer greater than 1 and less than or equal to Z, v is an integer greater than or equal to 1 and less than u, and L is the CP length of the basic resource.

In a possible design, among the Z consecutive basic resources, the reference signal carried on the third OFDM symbol included in the u-th basic resource and the reference signal carried on the third OFDM symbol included in the v-th basic resource Signaling

The signals obtained by the long cyclic shift are the same, Ln is the CP length of the n-th basic resource, u is an integer greater than 1 and less than or equal to Z, and v is an integer greater than or equal to 1 and less than u.

In a possible design, the Z consecutive basic resources are the last Z basic resources in the downlink transmission part of the uplink-downlink switching period.

In an eighth aspect, an embodiment of the present application provides a method for sending a reference signal, including:

Sending reference signals carried on Z consecutive basic resources;

Wherein, the basic resource includes Y consecutive third orthogonal frequency division multiplexing OFDM symbols, and a cyclic suffix CS; wherein, the reference signals carried on the Y third OFDM symbols included in one basic resource are the same ; The third OFDM symbol does not include CP;

Wherein, among the Z consecutive basic resources, any two adjacent basic resources, in the time domain, the reference signal carried on the third OFDM symbol included in the latter basic resource and the first included in the previous basic resource The signals obtained by cyclic shifting the reference signals carried on the three OFDM symbols are the same, and the length of the cyclic shift is determined by the CS length of the basic resource.

In a possible design, the CS length of the basic resource is the CS length of the previous basic resource among the two adjacent basic resources.

In a possible design, among the Z consecutive basic resources, the reference signal carried on the third OFDM symbol included in the u-th basic resource is performed with the reference signal carried on the third OFDM symbol included in the v-th basic resource. (uv) The signals obtained by the cyclic shift of J length are the same, u is an integer greater than 1 and less than or equal to Z, v is an integer greater than or equal to 1 and less than u, and J is the CS length of the basic resource.

The signals obtained by the long cyclic shift are the same, Jn is the CS length of the n-th basic resource, u is an integer greater than 1 and less than or equal to Z, and v is an integer greater than or equal to 1 and less than u.

In a ninth aspect, an embodiment of the present application provides a method for sending a reference signal, including:

Sending reference signals carried on Z consecutive basic resources;

Wherein, the basic resource includes Y consecutive third orthogonal frequency division multiplexing OFDM symbols, and a cyclic prefix CP and a cyclic suffix CS; wherein, one of the basic resources includes Y third OFDM symbols. The reference signals carried are the same; the third OFDM symbol does not include CP;

Wherein, among the Z consecutive basic resources, any two adjacent basic resources, in the time domain, the reference signal carried on the third OFDM symbol included in the latter basic resource is compared with the third basic resource included in the previous basic resource. The cyclic shift of the reference signal carried on the OFDM symbol results in the same signal, and the length of the cyclic shift is determined by the CP of the basic resource and the CS length of the basic resource.

In a possible design, the CS length of the basic resource is the CS length of the previous one of the two adjacent basic resources, and the CP length of the basic resource is the two adjacent basic resources CP length of the latter basic resource in

In a possible design, among the Z consecutive basic resources, the reference signal carried on the third OFDM symbol included in the u-th basic resource is performed with the reference signal carried on the third OFDM symbol included in the v-th basic resource. (uv)·(L+J) long cyclic shifts get the same signal, u is an integer greater than 1 and less than or equal to Z, v is an integer greater than or equal to 1 and less than u, L is the CP length of the basic resource , J is the CS length of the basic resource.

The signals obtained by the long cyclic shift are the same, Ln is the CP length of the n-th basic resource, Jn is the CS length of the n-th basic resource, u is an integer greater than 1 and less than or equal to Z, and v is greater than or equal to 1. And an integer less than u.

In a tenth aspect, an embodiment of the present application provides a method for receiving a reference signal, including:

Determining a first resource for receiving a reference signal, where the first resource includes an uplink OFDM symbol and/or a guard interval;

A reference signal is received on the first resource; the reference signal is sent through a second resource, and the second resource includes Z continuous basic resources; the basic resource includes Y continuous third orthogonal frequencies Multiplexing OFDM symbols, and a cyclic prefix CP and/or a cyclic suffix CS; wherein the reference signals carried on the Y third OFDM symbols included in one basic resource are the same; the third OFDM symbols do not include CP; the second resource is a downlink transmission resource (for example, the second resource includes a third OFDM symbol as a downlink OFDM symbol);

In one possible design, it also includes:

In an eleventh aspect, an embodiment of the present application provides a method for receiving a reference signal, including:

A reference signal is received on the first resource; the reference signal is sent through a second resource, and the second resource includes Z consecutive basic resources; the basic resource includes Y consecutive third orthogonal frequencies Multiplexing OFDM symbols and a cyclic prefix CP; wherein the reference signals carried on the Y third OFDM symbols included in one of the basic resources are the same; the third OFDM symbol does not include the CP; the second resource Is a downlink transmission resource (for example, the second resource including the third OFDM symbol is a downlink OFDM symbol);

In a twelfth aspect, an embodiment of the present application provides a method for receiving a reference signal, including:

A reference signal is received on the first resource; the reference signal is sent through a second resource, and the second resource includes Z continuous basic resources; the basic resource includes Y continuous third orthogonal frequencies Multiplexing OFDM symbols and a cyclic suffix CS; wherein the reference signals carried on the Y third OFDM symbols included in one basic resource are the same; the third OFDM symbols do not include CP; and the second resource is Downlink transmission resources (for example, the second resource includes the third OFDM symbol being a downlink OFDM symbol);

In a thirteenth aspect, an embodiment of the present application provides a method for receiving a reference signal, including:

A reference signal is received on the first resource; the reference signal is sent through a second resource, and the second resource includes Z consecutive basic resources; the basic resource includes Y consecutive third orthogonal frequencies Multiplexing OFDM symbols, a cyclic prefix CP and a cyclic suffix CS; wherein the reference signals carried on the Y third OFDM symbols included in one of the basic resources are the same; the third OFDM symbol does not include the CP; The second resource is a downlink transmission resource (for example, the second resource including the third OFDM symbol is a downlink OFDM symbol);

In a fourteenth aspect, a device is provided. The device provided in the present application has the function of realizing the behavior of the network device in the above method, and it includes means for executing the steps or functions described in the above method. The steps or functions can be realized by software, or by hardware (such as a circuit), or by a combination of hardware and software.

In a possible design, the foregoing device includes one or more processors and communication units. The one or more processors are configured to support the apparatus to perform corresponding functions of the network device in the above method. For example, the reference signal is carried on the OFDM symbol and transmitted. The communication unit is used to support the device to communicate with other devices, and realize the receiving and/or sending functions. For example, sending a reference signal.

Optionally, the device may further include one or more memories, where the memory is used for coupling with the processor and stores necessary program instructions and/or data for the device. The one or more memories may be integrated with the processor, or may be provided separately from the processor. This application is not limited.

The communication unit may be a transceiver, or a transceiver circuit. Optionally, the transceiver may also be an input/output circuit or interface.

The device may be a base station, gNB or TRP, etc., and the communication unit may be a transceiver or a transceiver circuit. Optionally, the transceiver may also be an input/output circuit or interface.

The device may also be a communication chip. The communication unit may be an input/output circuit or interface of a communication chip.

In another possible design, the above device includes a transceiver, a processor, and a memory. The processor is used to control the transceiver or the input/output circuit to send and receive signals, the memory is used to store a computer program, and the processor is used to run the computer program in the memory so that the device executes the first aspect or any one of the first aspect The method completed by the network device in the possible implementation manners, or the method completed by the network device in the second aspect or any one of the possible implementation manners of the second aspect, or the third aspect or any one of the possible implementation manners of the third aspect The method completed by the network device, or the method completed by the network device in any one of the fourth aspect or the fourth aspect, or the method completed by the network device in any one of the fifth aspect or the fifth aspect Method, or execute the method completed by the network device in any one of the sixth aspect or the sixth aspect, or execute the method completed by the network device in any one of the seventh aspect or the seventh aspect, or execute The method implemented by the network device in any one of the eighth aspect or the eighth aspect may be implemented, or the method implemented by the network device in any one of the ninth aspect or the ninth aspect may be implemented, or the tenth aspect or The method completed by the network device in any possible implementation manner of the tenth aspect, or the method completed by the network device in any possible implementation manner of the eleventh aspect or the eleventh aspect, or the implementation of the twelfth aspect or the first aspect The method completed by the network device in any possible implementation manner in the twelfth aspect, or the method completed by the network device in any possible implementation manner in the thirteenth aspect or the thirteenth aspect.

In a fifteenth aspect, a system is provided, which includes the above-mentioned at least two network devices.

In a sixteenth aspect, a computer-readable storage medium is provided for storing a computer program. The computer program includes instructions for executing the method in the first aspect or any one of the possible implementations of the first aspect, or includes Instructions for executing the method in the second aspect or any one of the possible implementations of the second aspect, or include instructions for executing the method in the third aspect or any of the possible implementations of the third aspect, or including The instruction used to execute the method in any one of the fourth aspect or the fourth aspect, or the instruction used to execute the method in any one of the fifth aspect or the fifth aspect, or includes Instructions for executing the method in the sixth aspect or any one of the possible implementation manners of the sixth aspect, or including instructions for executing the method in the seventh aspect or any one of the possible implementation manners of the seventh aspect, or including Instructions for executing the method in the eighth aspect or any one of the possible implementation manners of the eighth aspect, or including instructions for executing the method in the ninth aspect or any one of the possible implementation manners of the ninth aspect, or including Instructions for executing the method in the tenth aspect or any one of the possible implementation manners of the tenth aspect, or including instructions for executing the method in the eleventh aspect or any one of the possible implementation manners of the eleventh aspect, Or include instructions for executing the method in the twelfth aspect or any one of the possible implementation manners of the twelfth aspect, or include instructions for executing the method in the thirteenth aspect or any one of the possible implementation manners of the thirteenth aspect Method instruction.

In a seventeenth aspect, a computer program product is provided, the computer program product comprising: computer program code, when the computer program code runs on a computer, the computer executes the first aspect or any one of the first aspect The method in one possible implementation manner, or the method in any one of the second aspect or the second aspect, or the method in the third aspect or any one of the third aspect, or the The fourth aspect or the method in any one of the possible implementation manners of the fourth aspect, or the implementation of the method in any one of the fifth aspect or the fifth aspect, or the implementation of the sixth aspect or the sixth aspect A possible implementation method, or implementation of the seventh aspect or any one of the seventh aspect, or any one of the eighth aspect or the eighth aspect, or the ninth aspect Or any one of the possible implementation methods of the ninth aspect, or the implementation of the tenth aspect or any one of the possible implementation methods of the tenth aspect, or the implementation of the eleventh aspect or any one of the possible implementations of the eleventh aspect Or the method of implementing any one of the possible implementation manners of the twelfth aspect or the twelfth aspect, or the method of implementing any one of the possible implementation manners of the thirteenth aspect or the thirteenth aspect.

Description of the drawings

FIG. 1 is an architecture diagram of a communication system provided by an embodiment of the application;

FIG. 2 is a schematic diagram of a different direction interference provided by an embodiment of this application;

FIG. 3 is a schematic diagram of another different direction interference provided by an embodiment of this application;

FIG. 4 is a schematic diagram of generating OFDM symbols according to an embodiment of the application;

FIG. 5 is a schematic diagram of frequency-domain correlation detection provided by an embodiment of this application;

FIG. 6 is a schematic diagram showing that the cycle characteristic provided by an embodiment of the application is destroyed;

FIG. 7A is a schematic diagram of the first OFDM symbol provided by an embodiment of this application;

FIG. 7B is a schematic diagram of the second OFDM symbol provided by an embodiment of the application;

FIG. 7C is a schematic diagram of two adjacent OFDM symbols satisfying cyclic characteristics according to an embodiment of the application;

FIG. 7D is a schematic diagram of three consecutive OFDM symbols satisfying cyclic characteristics provided by an embodiment of the application;

FIG. 7E is a schematic diagram of another two adjacent OFDM symbols satisfying the cyclic characteristic provided by an embodiment of the application;

8 is a schematic diagram of the relationship between RSs carried on different OFDM symbols according to an embodiment of the application;

FIG. 9A is a time-domain schematic diagram of the first basic resource structure carrying reference signals provided by an embodiment of this application;

FIG. 9B is a time-domain schematic diagram of the second basic resource structure carrying reference signals according to an embodiment of this application;

FIG. 9C is a time-domain schematic diagram of a third basic resource structure carrying reference signals provided by an embodiment of this application;

FIG. 10 is a schematic diagram of the cycle characteristics between basic resources provided by an embodiment of the application being destroyed;

FIG. 11 is a schematic diagram of two adjacent basic resources satisfying cyclic characteristics provided by an embodiment of this application;

FIG. 12 is a schematic diagram of another two adjacent basic resources that meet the cyclic characteristic provided by an embodiment of this application;

FIG. 13 is a schematic diagram of the time domain and frequency domain of the reference signal carried by the basic resource provided by an embodiment of the application;

FIG. 14 is a schematic diagram of the relationship between RSs carried on different basic resources provided by an embodiment of this application;

FIG. 15 is a flowchart of a method provided by an embodiment of this application;

FIG. 16 is a schematic diagram of receiving and sending time configuration according to an embodiment of the application;

FIG. 17 is a schematic diagram of normal and abnormal transmission RS provided by an embodiment of the application;

18 is a schematic diagram of the timing relationship between base station 1 sending reference signals and base station 2 detecting reference signals according to an embodiment of the application;

FIG. 19 is a flowchart of another method provided by an embodiment of this application;

20A is a schematic diagram of a resource position occupied by a reference signal according to an embodiment of this application;

20B is a schematic diagram of another reference signal occupation resource location provided by an embodiment of this application;

FIG. 20C is a schematic diagram of resource locations corresponding to reference signal transmission and reception according to an embodiment of this application;

FIG. 21A is a schematic structural diagram of an apparatus provided by an embodiment of this application;

FIG. 21B is a schematic structural diagram of a network device provided by an embodiment of the present application;

FIG. 22 is a schematic structural diagram of a communication device provided by an embodiment of the present application.

detailed description

The embodiments of this application can be applied to but not limited to 5G systems, such as NR systems, and can also be applied to LTE systems, long-term evolution-advanced (LTE-A) systems, and enhanced long-term evolution technologies (enhanced long term evolution). -advanced (eLTE) and other communication systems can also be extended to related cellular systems such as wireless fidelity (WiFi), worldwide interoperability for microwave access (wimax), and 3GPP. Specifically, the communication system architecture applied in the embodiment of the present application may be as shown in FIG. 1, including at least two network devices, namely network device 1 and network device 2, respectively. Network device 1 serves terminal device 1, and network device 2 serves于terminal equipment 2. The network device 1 and the network device 2 may be network devices that are geographically separated relatively far apart. It should be noted that the embodiments of the present application do not limit the number of terminal devices and network devices in the communication system shown in FIG. 1.

Hereinafter, some terms in this application are explained to facilitate the understanding of those skilled in the art.

1) Network equipment is the equipment that connects the terminal to the wireless network in the communication system. The network equipment is a node in a radio access network, which may also be referred to as a base station, or may also be referred to as a radio access network (RAN) node (or device). In the following description, a base station is used as an example. At present, some examples of network equipment are: gNB, transmission reception point (TRP), evolved Node B (evolved Node B, eNB), radio network controller (RNC), Node B (Node B) B, NB), base station controller (BSC), base transceiver station (base transceiver station, BTS), home base station (for example, home evolved NodeB, or home Node B, HNB), baseband unit (baseband unit) , BBU), or wireless fidelity (Wifi) access point (AP), etc. In addition, in a network structure, the network device may include a centralized unit (CU) node and a distributed unit (DU) node. This structure splits the protocol layer of the eNB in the long term evolution (LTE) system. Some of the protocol layer functions are placed under the centralized control of the CU, and some or all of the protocol layer functions are distributed in the DU. Centralized control of DU.

2) Terminal, also called terminal equipment, user equipment (UE), mobile station (MS), mobile terminal (MT), etc., is a way to provide users with voice and/or data Connected devices, for example, handheld devices with wireless connectivity, vehicle-mounted devices, etc. At present, some examples of terminals are: mobile phones, tablet computers, notebook computers, handheld computers, mobile internet devices (MID), wearable devices, virtual reality (VR) devices, augmented reality (augmented reality, AR) equipment, wireless terminals in industrial control, wireless terminals in autonomous driving (self-driving), wireless terminals in remote medical surgery, and smart grid (smart grid) The wireless terminal in the transportation safety (transportation safety), the wireless terminal in the smart city (smart city), the wireless terminal in the smart home (smart home), etc.

3) Different direction interference (CLI):

The CLI between base stations mainly refers to that a downlink (DL) signal sent by one base station interferes with an uplink (UL) signal of another base station. The uplink signal may be, for example, a signal sent by the UE to the base station. As shown in Fig. 2, the left and right cells belonging to two base stations work in the same frequency band, the cell on the left belongs to the first base station, and the base station on the right belongs to the second base station. In the cell on the left, the first base station is sending DL signals to UE1, and in the cell on the right, the second base station is receiving UL signals sent by UE2, but the DL signals sent by the first base station can also be received by the second base station. Therefore, the downlink signal of the cell on the left interferes with the reception of the cell on the right.

The CLI between base stations usually occurs when the transmission directions of two TDD cells working on the same frequency are different. Therefore, if the TDD cell keeps the same transmission direction, the CLI will usually not be generated. But there are exceptions: two base stations that are geographically separated, even if they have the same transmission direction (that is, receive uplink/send downlink signals at the same time), but due to their far geographic location, one base station sends The downlink signal arrives at another base station after a significant time delay, and the other base station has switched from the downlink sending direction to the uplink receiving direction, and CLI will also be generated at this time, as shown in Figure 3: The downlink signal sent by base station 1 reaches base station 2. At this time, time delay is generated, and base station 2 is receiving uplink signals at this time, thereby generating CLI.

4) Cyclic shift:

The so-called cyclic shift means that the bits in the original range before the shift are not lost when shifting, but they are used as complementary bits at the other end. For example, taking the cyclic left shift as an example, the sequence A=123456, and the sequence B after the sequence A is cyclically shifted by two bits is: B=345612. Taking the cyclic right shift as an example, the sequence C after the sequence A is cyclically shifted by two bits is: C=561234. That is, if the sequence x(n), n=0,1,2,...,N-1 is cyclically shifted to the left by K bits to obtain the sequence y(n), then x(n) and y(n) satisfy y(n)=x(n+K) _N , n=0,1,2,...,N-1, where x(n) _N represents the period extension of x(n). Without loss of generality, for a sequence with sequential significance, "left" can mean "earlier/earlier in time", and "right" can mean "later/late in time"; for example, sequence A=123456, because "1" is to the left of "2", so "1" is earlier than "2".

5) Orthogonal frequency division system:

Orthogonal frequency division multiplexing (OFDM) communication systems are multi-carrier systems. In the frequency domain, one OFDM symbol occupies multiple orthogonal subcarriers. In the time domain, an OFDM symbol includes multiple samples, also called sampling points; the signal carried by an OFDM symbol is a signal obtained by superimposing N orthogonal sub-carrier signals. An OFDM symbol is usually generated by first carrying the signal to be transmitted in the frequency domain, and then converting it into the time domain by inverse Fourier transform; the OFDM symbol converted into the time domain also needs to add a cyclic prefix (CP) , That is, add several sampling points at the end to the head end as a CP to form an OFDM symbol with CP, as shown in Figure 4. In FIG. 4, a square in the frequency domain sequence represents one or more subcarriers, and a square in the time domain sequence represents one or more samples.

In order to combat the existence of CLI between ultra-long-distance base stations, it is first necessary to perform measurements between base stations. In NR, there is currently no standardized reference signal for channel condition measurement between NR base stations, and there is no standardized measurement process.

The applicant found that to perform ultra-long-distance measurement between base stations, it is necessary to consider the problem of uncertain arrival time between reference signals (RS). This is because the distance between the base stations that cause ultra-long-distance interference is uncertain, so the time for the RS sent from base station 1 to reach base station 2 is also uncertain. Due to the uncertainty of RS time delay, a base station can only detect the reference signal by blind detection. If correlation detection is performed in the time domain, time-domain sliding correlation window detection is required for sampling points one by one, and convolution calculation is required for each sampling point position, which is very computationally expensive. Correlation detection in the frequency domain can obtain the correlation calculation results corresponding to multiple sampling points at one time through "Fourier Transform-Frequency Domain Point Multiplication-Inverse Fourier Transform", so the frequency domain correlation detection is less complicated. Therefore, it is more advantageous to use frequency-domain correlation detection for measurements between base stations. The frequency domain correlation detection needs to ensure that at least one complete sample to be detected can be observed in the time domain in a detection window, and the observed sample to be detected may be a sample to be detected after a cyclic shift. Therefore, if you want to use the frequency domain correlation detection method to detect the reference signal, you should ensure that the reference signal has cyclic shift characteristics, that is, the reference signal can include several repeated parts, each part is the same, each part is equivalent to one A complete sample to be tested. From a mathematical point of view, for a cyclic sequence x(n) with a total length of N, x(n)=x(n+K) should be satisfied, where n=0,1,2,...,NK-1 All times are true, and K is a constant related to the cycle characteristics, such as the length of each part. When at least one of these repeated parts is detected in the detection window, it can be determined that the reference signal is detected.

For example, if the length of the detection window is one OFDM symbol, and the length of the repeated part included in the reference signal is also one OFDM symbol, then the reference signals carried in consecutive OFDM symbols are required to be the same. As shown in FIG. 5, base station 2 performs frequency-domain correlation detection on the RS sent by base station 1. According to the characteristics of frequency-domain correlation detection, the RSs carried in consecutive OFDM symbols sent by the base station 1 are the same, and the cyclic characteristics are guaranteed. As an example in FIG. 5, it is assumed that the detection window length is 1 OFDM symbol, and the RS occupies 2 consecutive OFDM symbols.

In order to include at least one complete RS in the detection window, a possible design is to make the RS carried by two consecutive OFDM symbols before and after the same.

However, if the same RS is directly carried on the two OFDM symbols before and after, the cyclic characteristics will be destroyed due to the addition of the respective CP on each OFDM symbol. For example, as shown in FIG. 6, different filled symbols respectively represent the first OFDM symbol and the second OFDM symbol, and the same RS is carried on the two OFDM symbols before and after, that is, 12345678 in the time domain. However, after the CP is added to each OFDM symbol, the transmitted RS is in the form of "78-12345678-78-12345678", which is cyclic within only one OFDM symbol (that is, the form of 78-12345678), but it is in the form of two OFDM symbols are not cyclic, and the cyclic characteristics between two OFDM symbols need to be in the form of "12345678-12345678". Due to the destruction of cyclic characteristics, the receiving end cannot effectively perform blind detection through frequency-domain correlation methods.

Based on this, the embodiments of the present application provide a method and device for sending and receiving a reference signal to solve the problem that the channel measurement cannot be performed between two long-distance base stations in the prior art. Among them, the method and the device are based on the same inventive concept. Since the principles of the method and the device to solve the problem are similar, the implementation of the device and the method can be referred to each other, and the repetition will not be repeated.

The base station 1 at the transmitting end may carry the reference signal on multiple symbols and send it to the base station 2 at the receiving end. For example, the base station 1 may transmit the reference signal on M consecutive OFDM symbols.

The continuity mentioned here refers to continuity in the time domain. In addition, on the one hand, the OFDM symbols involved in the embodiments of the present application may be OFDM symbols with CP added, on the other hand, the OFDM symbols may also be OFDM symbols with cyclic suffix (CS) added.

The following describes the relationship between the reference signals respectively carried by the M consecutive OFDM symbols in the time domain and the frequency domain.

First, take the CP-added OFDM symbol as an example to illustrate from the time domain:

In the time domain, in M consecutive OFDM, the reference signal carried by the part of the first OFDM symbol excluding the CP is the same as the signal obtained by cyclic shifting the reference signal carried by the part of the second OFDM symbol excluding the CP. . The first OFDM symbol and the second OFDM symbol are any two OFDM symbols among the M consecutive OFDM symbols.

If the first OFDM symbol is later than the second OFDM symbol in the time domain, the cyclic shift is a cyclic left shift. W can be based on the CP length of the OFDM symbol between the first OFDM symbol and the second OFDM symbol and the first OFDM symbol The CP length is determined.

If the first OFDM symbol is earlier than the second OFDM symbol in the time domain, the cyclic shift is a cyclic right shift. W may be based on the CP length of the OFDM symbol between the first OFDM symbol and the second OFDM symbol and the second OFDM symbol. The CP length of the OFDM symbol is determined.

In a possible example, the first OFDM symbol and the second OFDM symbol are two adjacent OFDM symbols in the time domain, and the two adjacent OFDM symbols are in the time domain, and the latter OFDM symbol is The reference signal carried by the part excluding the CP is the same as the signal obtained by cyclic shift (circular left shift) of the reference signal carried by the part excluding the CP on the previous OFDM symbol. The length of the cyclic shift is determined by the CP length of the OFDM symbol definite.

Exemplarily, the CP length of the OFDM symbol is the CP length of the last OFDM symbol among the two adjacent OFDM symbols.

Wherein, the latter and the former refer to the time before and after.

If the CP length from the second OFDM symbol to the Mth OFDM symbol is the same in M OFDM symbols, for example, both are L, the length of the cyclic shift of the reference signal carried by the part of the previous OFDM symbol excluding the CP It is L, that is, the signal obtained by cyclic shifting (circular left shift) the reference signal carried by the part of the previous OFDM symbol without the CP by L bits is the same as the reference signal carried by the part of the latter OFDM symbol without the CP.

In another possible example, among the M consecutive OFDM symbols, the reference signal carried by the part of the u-th OFDM symbol excluding the CP and the reference signal carried by the part excluding the CP of the v-th OFDM symbol are performed (uv)·L The signals obtained by the long cyclic shift are the same, u is an integer greater than 1 and less than or equal to M, v is an integer greater than or equal to 1 and less than u, and L is the CP length of the OFDM symbol. For example, when v=1, the reference signal carried by the part of the u-th OFDM symbol excluding the CP and the reference signal carried by the part of the first OFDM symbol excluding the CP are subjected to a (u-1)·L-long cyclic shift (circular left) The signals obtained by shift) are the same, and the CP lengths of the 2nd to Mth OFDM symbols are all L.

In another possible example, among the M consecutive OFDM symbols, the reference signal carried by the part of the u-th OFDM symbol excluding the CP is performed with the reference signal carried by the part excluding the CP of the v-th OFDM symbol.

The signals obtained by the long cyclic shift are the same, Ln is the CP length of the nth OFDM symbol, u is an integer greater than 1 and less than or equal to M, and v is an integer greater than or equal to 1 and less than u. For example, when v=1, the reference signal carried by the part excluding the CP of the u-th OFDM symbol is compared with the reference signal carried by the part excluding the CP of the first OFDM symbol.

Long cyclic shift (circular shift left) results in the same signal.

The following is an example of adding CS OFDM symbols to illustrate from the time domain:

In the time domain, in M consecutive OFDM, the reference signal carried by the part of the first OFDM symbol excluding the CS is the same as the signal obtained by performing a W-long cyclic shift on the part of the second OFDM symbol excluding the CS. . The first OFDM symbol and the second OFDM symbol are any two OFDM symbols among the M consecutive OFDM symbols.

If the first OFDM symbol is later than the second OFDM symbol in the time domain, the cyclic shift is a cyclic left shift. W can be based on the CS length of the OFDM symbol between the first OFDM symbol and the second OFDM symbol and the second OFDM symbol. The CS length of the symbol is determined.

If the first OFDM symbol is earlier than the second OFDM symbol in the time domain, the cyclic shift is a cyclic right shift. W can be based on the CS length of the OFDM symbol separated from the first OFDM symbol and the second OFDM symbol and the first The CS length of OFDM is determined.

In a possible example, the first OFDM symbol and the second OFDM symbol are two adjacent OFDM symbols in the time domain, and the two adjacent OFDM symbols are in the time domain, and the latter OFDM symbol is The reference signal carried by the part excluding the CS is the same as the signal obtained by cyclic shifting (circular shifting to the left) the reference signal carried by the part excluding the CS on the previous OFDM symbol. The length of the cyclic shift is determined by the CS length of the OFDM symbol definite.

Exemplarily, the CS length of the OFDM symbol is the CS length of the previous OFDM symbol among the two adjacent OFDM symbols.

If in M OFDM symbols, the CS length from the first OFDM symbol to the M-1th OFDM symbol is the same, for example, both are L, then the reference signal carried by the part of the previous OFDM symbol excluding CS is cyclically shifted The length of is L, that is, the signal obtained by cyclically shifting (circularly shifting left) the reference signal carried by the part of the previous OFDM symbol without CS is the same as the reference signal carried by the part of the latter OFDM symbol without CS.

In another possible example, among the M consecutive OFDM symbols, the reference signal carried by the part of the u-th OFDM symbol excluding the CS and the reference signal carried by the part of the v-th OFDM symbol excluding the CS are performed (uv)·L The signals obtained by the long cyclic shift are the same, u is an integer greater than 1 and less than or equal to M, v is an integer greater than or equal to 1 and less than u, and L is the CS length of the OFDM symbol. For example, when v=1, the reference signal carried by the part of the u-th OFDM symbol excluding the CS and the reference signal carried by the part of the first OFDM symbol excluding the CS are subjected to a (u-1)·L-long cyclic shift (circular left) The signals obtained by shift) are the same, and the CS lengths of the 2nd to Mth OFDM symbols are all L.

In another possible example, among the M consecutive OFDM symbols, the reference signal carried by the part of the u-th OFDM symbol excluding the CS and the reference signal carried by the part of the v-th OFDM symbol excluding the CS are performed.

The signals obtained by the long cyclic shift are the same, Ln is the CS length of the nth OFDM symbol, u is an integer greater than 1 and less than or equal to M, and v is an integer greater than or equal to 1 and less than u. For example, when v=1, the reference signal carried by the part of the u-th OFDM symbol excluding CS is performed with the reference signal carried by the part of the first OFDM symbol excluding CS.

Long cyclic shift (circular shift left) results in the same signal.

In the following, taking the first OFDM symbol and the second OFDM symbol among the M OFDM symbols including the CP as an example, it will be described how any two OFDM symbols satisfy the cyclic characteristics through cyclic shift.

For example, the first OFDM symbol is x ₁ (n), and the length is N when the CP is not included. After adding the L-long CP, it will be at n=0,1,2,...,L-1 The N point cyclic shift characteristic is satisfied within the range, that is, the condition shown in formula (1) is satisfied:

x ₁ (n)=x ₁ (n+N), n=0,1,2,...,L-1 (1)

See Figure 7A, taking N=8 as an example.

The second OFDM symbol is x ₂ (m), and the length is N when the CP is not included. After adding the L-long CP, it will be in the range of m=0,1,2,...,L-1 Satisfy the N-point cyclic shift characteristics, that is, satisfy the condition shown in formula (2):

x ₂ (m)=x ₂ (m+N), m=0,1,2,...,L-1 (2)

See Figure 7B, taking N=8 as an example.

By connecting the first OFDM symbol (including CP) with the second OFDM symbol (including CP) in the time domain, and the second OFDM symbol is after the first OFDM symbol, we can get n=N+L,N X ₁ (n) in the range of +L+1,N+L+2,...,2N+2L-1 and x ₂ (m) in the range of m=0,1,2,...,N+L-1 The relationship, that is, satisfy the condition shown in formula (3):

x ₁ (n)=x ₂ (nNL), n=N+L,N+L+1,N+L+2,...,2N+2L-1 (3)

Within the first OFDM symbol and the second OFDM symbol, the condition that x ₁ (n) satisfies the N-point cyclic characteristic is shown in formula (4):

x ₁ (n)=x ₁ (n+N), n=0,1,2,...,L-1,L,L+1,L+2,...,N+2L-1 (4)

In formula (4), the value range of n is n=0,1,2,...,L-1,L,L+1,L+2,...,N+2L-1. Combining formula (3) and formula (4), formula (5) can be obtained:

x ₂ (n)=x ₁ (n+N+L)=x ₁ (n+L), n=0,1,2,...,N+L-1 (5)

Formula (5) reflects the relationship between x ₁ (n) and x ₂ (n). But further, considering that x ₁ (n) and x ₂ (n) are actually defined as N-long sequences, and L is the number of points to add CP, it is necessary to obtain the domain of n=0,1,2,... The relationship between x ₁ (n) and x ₂ (n) in the range of N-1 (or n=L, L+1,...L+N-1, both are equivalent). Further, combining formula (1), formula (2) and formula (5), formula (6) can be obtained:

It can be seen from formula (6) that the sequence obtained after x ₁ (n) and x ₂ (n) are connected still satisfies the condition of the N-point cyclic characteristic: the sequence obtained after x ₂ (n) is cyclically shifted by the L point and x ₁ (n) is the same.

Exemplarily, referring to Figure 7C, when x ₁ (n) and x ₂ (n) are connected, in order to ensure that the entire sequence still satisfies N points (N=8 in Figure 7C as an example) cyclic characteristics, x ₂ ( "12345678" of n) needs to be equal to "34567812" of x ₁ (n), which is equivalent to the sequence obtained by cyclic shifting the part of x ₂ (n) that does not include CP and x ₁ (n) does not include CP The parts are the same (L=2 as an example in Fig. 7C).

The above conclusion can also be extended to the case where the reference signal is mapped to multiple symbols, as shown in Figure 7D, taking three symbols as an example: when x ₁ (n), x ₂ (n) and x ₃ (n) are connected Later, in order to ensure that the entire sequence still meets the cyclic characteristics of N points (N=8 in Figure 7D as an example), the "12345678" of x ₂ (n) needs to be equal to the "34567812" of x ₁ (n), which is equivalent to x ₂ ( n) The sequence obtained by the cyclic shift of the L point is the same as x ₁ (n) (L=2 in Figure 7D as an example); the "12345678" of x ₃ (n) needs to be equal to the "34567812" of x ₂ (n) , Which is equivalent to the sequence obtained by cyclically shifting the part of x ₃ (n) that does not include CP with the L point is the same as the part of x ₂ (n) that does not include CP, and the "12345678" of x ₃ (n) is also equal to x "56781234" of ₁ (n) is equivalent to the sequence obtained by cyclically shifting the part of x ₃ (n) that does not include CP by 2L points and the part of x ₁ (n) that does not include CP.

As an example, referring to Figure 7E, the two reference signal sequences for adding CS are x ₄ (n) and x ₅ (n), x ₄ (n) is "1234567812", if x ₄ (n) and x _{After 5} (n) is connected, in order to ensure that the entire sequence meets the N-point cycle characteristics, N is the length of the two reference signal sequences without CS added, and x ₅ (n) should be "3456781234".

The following explains from the frequency domain:

In the frequency domain, among the M consecutive OFDM symbols, the phase of the reference signal carried on the first subcarrier of the first OFDM symbol is compared with the phase of the reference signal carried on the first subcarrier of the second OFDM symbol. The phase difference between the phases is determined by the index of the first subcarrier, where the first OFDM symbol and the second OFDM symbol are any two OFDM symbols among the M consecutive OFDM symbols, and M is greater than Or an integer equal to 2. It should be noted that one OFDM symbol occupies multiple subcarriers in the frequency domain, and the number of subcarriers occupied is related to the system bandwidth. The first subcarrier is one OFDM symbol occupies any one of the multiple subcarriers in the frequency domain.

For OFDM multi-carrier systems such as NR and LTE, it is possible that an OFDM symbol not only needs to carry the RS, but also needs to carry the data sent to the UE, that is, for the base station 1, the RS and the data sent to the base station 2 The data sent to the UE it serves is carried on different subcarriers of the same OFDM symbol. If the second OFDM symbol is directly cyclically shifted in the time domain, it may cause problems such as inaccurate estimation of its downlink channel by the terminal equipment, and inability to correctly receive and demodulate the data on the cyclically shifted OFDM symbol. Therefore, through the frequency domain adjustment means provided in the embodiments of the present application, under the premise that the RSs of M OFDM symbols can be correctly detected, the data reception thereof is not affected.

The cyclic shift of the OFDM signal in the time domain will appear in the frequency domain as the phase shift of the corresponding frequency domain signal (that is, the phase difference between the reference signals carried by two OFDM symbols on the same subcarrier). The phase offset between the reference signals carried on the same subcarrier of each OFDM symbol is determined according to the index of the subcarrier. For a complex number Ae ^iθ , i means

θ is its phase. The complex number phase usually considers its value in the range of 0-2π, that is, the value of θ mod 2π (θmod 2π), because for complex numbers, the phase of θ and the phase of (θ+2π) are equivalent. The phase offset (phase difference value) is proportional to the change of the subcarrier k, that is, the phase difference value changes with the index k of the subcarrier to show a linear characteristic, that is, there is a linear relationship between the phase difference value and the index k of the subcarrier .

The linear relationship between the phase difference w of the reference signal carried by the two OFDM symbols on the subcarrier k and the subcarrier index k is embodied in a linear relationship between the phase difference w and k, for example, w=Ak+ C, where A and C are constants independent of k. Exemplarily, among the M consecutive OFDM symbols, the phase of the reference signal carried on the first subcarrier of the first OFDM symbol is different from the phase of the reference signal carried on the first subcarrier of the second OFDM symbol The phase difference between W1 is w1, the phase between the phase of the reference signal carried on the second subcarrier of the first OFDM symbol and the phase of the reference signal carried on the second subcarrier of the second OFDM symbol The difference is w2, and the phase difference between the phase of the reference signal carried on the third subcarrier of the first OFDM symbol and the phase of the reference signal carried on the third subcarrier of the second OFDM symbol is w3 , The phase difference between the phase of the reference signal carried on the fourth subcarrier of the first OFDM symbol and the phase of the reference signal carried on the fourth subcarrier of the second OFDM symbol is w4; if the first The difference between the index of the two subcarriers and the index of the first subcarrier is equal to the difference between the index of the fourth subcarrier and the index of the third subcarrier, then the value of (w2-w1) mod 2π is equal to (w4-w3) modulo The value of 2π.

In a feasible implementation manner, for an OFDM symbol containing CP, the phase of the reference signal carried on the first subcarrier of the first OFDM symbol is the same as the reference signal carried on the first subcarrier of the second OFDM symbol The phase difference between the phases of the signals is also determined by the symbol length of the OFDM symbol and/or the cyclic prefix CP length of the OFDM symbol.

For OFDM symbols including CS, the phase difference between the phase of the reference signal carried on the first subcarrier of the first OFDM symbol and the phase of the reference signal carried on the first subcarrier of the second OFDM symbol is also It is determined by the symbol length of the OFDM symbol and/or the CS length of the OFDM symbol.

Exemplarily, taking an OFDM symbol including a CP as an example, the first OFDM symbol and the second OFDM symbol are separated by X OFDM symbols, and the first OFDM symbol is earlier than the second OFDM symbol in the time domain, so The X is an integer greater than or equal to 0; the CP length of the OFDM symbol is determined by the CP length of the X OFDM symbols and the CP length of the second OFDM symbol. For example, the first OFDM symbol is adjacent to the second OFDM symbol, and the CP length of the OFDM symbol is the CP length of the second OFDM symbol. For example, if the first OFDM symbol and the second OFDM symbol are separated by 2 OFDM symbols, the CP length of the OFDM symbol is determined according to the CP length of the spaced 2 OFDM symbols and the CP length of the second OFDM symbol. Among them, a feasible method is that the phase difference is determined by the sum of the CP length of two spaced OFDM symbols and the CP length of the second OFDM symbol.

In another feasible implementation manner, for an OFDM symbol including a CP, among the M consecutive OFDM symbols, any two adjacent OFDM symbols are carried on the first subcarrier of the next OFDM symbol The phase difference between the phase of the reference signal and the phase of the reference signal carried on the first subcarrier of the previous OFDM symbol is 2πLk/N, where N is the symbol length of the OFDM symbol, and L is the CP of the OFDM symbol Length, k is the index of the first subcarrier. Exemplarily, L is the CP length of the next OFDM symbol. Among them, the length N does not include the CP part.

For an OFDM symbol including CS, among the M consecutive OFDM symbols, any two adjacent OFDM symbols, the phase of the reference signal carried on the first subcarrier of the next OFDM symbol and the phase of the reference signal carried on the previous one The phase difference between the phases of the reference signals on the first subcarrier of the OFDM symbol is 2πLk/N, where N is the symbol length of the OFDM symbol, L is the CS length of the OFDM symbol, and k is the first subcarrier index of. Exemplarily, L is the CS length of the previous OFDM symbol. Among them, the length N does not include the CS part.

In yet another feasible implementation manner, for an OFDM symbol containing CP, among the M consecutive OFDM symbols, the phase and the phase of the reference signal carried on the first subcarrier of the u-th OFDM symbol are The phase difference between the phases of the reference signals on the first subcarrier of the v-th OFDM symbol is

For OFDM symbols including CS, among the M consecutive OFDM symbols, the phase of the reference signal carried on the first subcarrier of the uth OFDM symbol and the first subcarrier carried on the vth OFDM symbol The phase difference between the phases of the reference signal is

Where N is the symbol length of the OFDM symbol, Ln is the CS length of the nth OFDM symbol, u is an integer greater than 1 and less than or equal to M, v is an integer greater than or equal to 1 and less than u, k Is the index of the first subcarrier.

Exemplarily, taking the OFDM symbol containing CP as an example, if v=1, the phase of the reference signal carried on the first subcarrier of the uth OFDM symbol and the first subcarrier carried on the first OFDM symbol The phase difference between the phases of the reference signal is

Exemplarily, among the M consecutive OFDM symbols, the CP lengths of the 2nd to Mth OFDM symbols are equal and both are L, then the reference signal carried on the first subcarrier of the uth OFDM symbol The phase difference between the phase of and the phase of the reference signal carried on the first subcarrier of the vth OFDM symbol is

Exemplarily, among the M consecutive OFDM symbols, the CP lengths of the 2nd to Mth OFDM symbols are equal and both are L, then the reference signal carried on the first subcarrier of the uth OFDM symbol The phase difference between the phase of and the phase of the reference signal carried on the first subcarrier of the first OFDM symbol is

That is, 2π(u-1)Lk/N.

According to the nature of the OFDM system, the cyclic shift of the OFDM signal in the time domain will appear in the frequency domain as the phase shift of the corresponding frequency domain signal (that is, the two OFDM symbols are between reference signals carried on the same subcarrier). The phase difference), the phase offset is determined according to the index of the subcarrier. In other words, the cyclic shift of an OFDM signal in the time domain will appear in the frequency domain as the corresponding frequency domain signal point multiplied by a phase Sequence, the phase sequence is a linear phase sequence with a linear relationship with the subcarrier index k. Taking the OFDM symbol containing CP as an example, the corresponding derivation is as follows:

Let y(n) be the L point cyclic shift sequence of x(n) sequence, then y(n) satisfies formula (7):

y(n)=x(n+L) _N R _N (n) (7)

Among them, x(n+L) _N represents the cyclic extension sequence of x(n) sequence shifted by L points, R _N (n) represents a window function of N length, so that y(n) and x( n) The sequence obtained by cyclic shifting at point L is the same. Let X[k] represent the frequency domain signal of x(n) expanded by Fourier transform in the frequency domain, as shown in formula (8):

Equation (8) is the principle of the OFDM system, i is

The value range of k is k=0,1,2,...N-1. For example, Y[k] represents the frequency domain signal after y(n) is expanded by Fourier transform in the frequency domain, as shown in formula (9):

Let n+L=n’, then formula (9) can be further transformed into formula (10):

Since x(n') _N is a periodic sequence, the integral (that is, sum) of x(n') _N in the interval [L,L+1,...,N+L-1] and x(n') The integral of _N in the interval [0,1,...,N-1] is the same, so:

Therefore, it can be seen from the above formula (11) that the phase difference of the reference signal carried by the two OFDM symbols on the subcarrier index k is determined by the subcarrier k, and is also determined by the symbol length N of the OFDM symbol (that is, the Fourier transform的点) and L related. For the cyclic shift between two adjacent OFDM negative signs caused by the CP, the length L of the cyclic shift is the CP length of the OFDM symbol. And, the phase difference of the reference signal carried on the subcarrier with index k of two OFDM symbols is

It increases linearly with the index k of the subcarrier. The phase difference can also be regarded as a straight line varying with k, the slope of the straight line is 2πL/N.

That is, if an RS signal is carried on each OFDM symbol in a plurality of consecutive OFDM symbols, and the RS carried on the kth subcarrier of the first OFDM symbol is S(k), then for the second OFDM symbol The RS carried on subcarrier k should be S(k) multiplied by a complex compensation amount, and the phase of the complex compensation amount is

That is, the complex compensation amount is

For the 3rd, 4th, ... Mth OFDM symbols, the phase of the complex compensation amount to be multiplied by the RS carried on the subcarrier k on the mth OFDM symbol is

Ln is the CP length corresponding to the nth OFDM symbol; if the CP length from the 2nd OFDM symbol to the Mth OFDM symbol is L, the RS carried on the subcarrier k on the mth OFDM symbol needs The phase of the multiplied complex compensation amount is

That is, the phase of the phase compensation amount corresponding to the reference signal carried on the subcarrier k from the second OFDM symbol to the Mth OFDM symbol is

Therefore, for the base station that sends the reference signal, the reference signal carried on different OFDM symbols can be linearly phase compensated in the frequency domain to achieve an effect equivalent to the time domain cyclic shift; the base station that sends the reference signal sends the Reference signal, so that the base station receiving the reference signal can detect the reference signal in a frequency-domain correlation manner. Wherein, the transmitting base station may first generate the reference signal carried on one OFDM symbol, and then generate the reference signal carried on other OFDM symbols according to the relationship between the reference signals between different OFDM symbols described in the embodiment of the present application in the time domain/frequency domain Or, the sending base station can directly generate reference signals carried on multiple OFDM symbols according to the time-domain/frequency-domain relationship of reference signals between different OFDM symbols described in the embodiments of this application, or The reference signal is generated in other ways, which is not limited in this application.

Exemplarily, an OFDM symbol occupies 8 subcarriers as an example. As shown in FIG. 8, the RSs carried on the 8 subcarriers of the first OFDM are S(0), S(1), and S(2). …, S(7). According to the solution provided by the embodiment of this application, the RS carried on the 8 subcarriers of the second OFDM symbol are respectively S(0)*exp(i*0*2πL/N), S(1)*exp(i* 1*2πL/N), S(2)*exp(i*2*2πL/N),..., S(7)*exp(i*7*2πL/N), 8 subcarriers of the third OFDM symbol The RS carried on the above are S(0)*exp(i*2*0*2πL/N), S(1)*exp(i*2*1*2πL/N), S(2)*exp(i *2*2*2πL/N),..., S(7)*exp(i*2*7*2πL/N). Among them, exp(x) represents e ^x .

It should be noted that the above is based on the previous OFDM symbol. "The RS of the latter OFDM symbol is multiplied by one in the frequency domain.

“Linear phase”, but it can also be based on the latter OFDM symbol. “The RS of the previous OFDM symbol is multiplied by one in the frequency domain.

"Linear phase", the essence of the two is the same, that is, the phase difference between the RS on the subcarrier indexed k on two adjacent OFDM symbols is

In the embodiments of this application, the solutions provided by the embodiments of this application are described from the perspective of the symbols carrying the reference signals. As described in the previous embodiments, the following is from the perspective of the basic resources formed by multiple OFDM symbols carrying the reference signals. description. The base station 1 at the sending end may carry the reference signal on multiple basic resources and send it to the base station 2 at the receiving end.

In the embodiment of the application, the resource used to carry the RS measured between the base stations includes one or more basic resources, and each basic resource includes Y consecutive third OFDM symbols in the time domain (the third OFDM symbol does not include CP or CS), Y is an integer greater than or equal to 2; each third OFDM symbol in a basic resource carries the same RS. The time domain length of one basic resource is equal to the length of Y fourth OFDM symbols including CP. The fourth OFDM symbol in the embodiment of the present application represents an OFDM symbol including CP and/or CS. The third OFDM symbol is an OFDM symbol that does not include CP and CS.

Exemplarily, the third OFDM symbol and the fourth OFDM symbol have the same symbol length, that is, the third OFDM symbol has the same length as the fourth OFDM symbol excluding the CP and/or CS.

It should be understood that the OFDM symbols not explicitly described in the embodiments of the present application all refer to OFDM symbols including CP and/or CS.

Optionally, for ease of presentation, the RS carried by a third OFDM symbol may be referred to as an RS time domain sequence in the time domain.

Among them, each basic resource may include a CP and/or a CS. Therefore, the basic resources can be divided into the following three structures.

The first basic resource structure: the basic resource only includes the CP, the CP of the basic resource is at the forefront of the basic resource, and the CP length of the basic resource is equal to the sum of the CP lengths of Y fourth OFDM symbols. For example, referring to FIG. 9A, the time domain length of the basic resource is equal to two fourth OFDM symbols as an example in FIG. 9A. One basic resource includes two third OFDM symbols and one CP.

The second basic resource structure: the basic resource only includes the CS, the CS of the basic resource is at the end of the basic resource, and the length of the CS of the basic resource is equal to the sum of the CP lengths of Y fourth OFDM symbols. For example, referring to 9B, the time domain length of the basic resource is equal to two fourth OFDM symbols as an example in FIG. 9B. One basic resource includes two third OFDM symbols and one CS.

The third basic resource structure: the basic resource includes a CP and a CS, the CS of the basic resource is at the end of the basic resource, and the CP of the basic resource is at the forefront of the basic resource. For example, referring to FIG. 9C, in FIG. 9C, the time domain length of the basic resource is equal to two fourth OFDM symbols as an example. One basic resource includes two third OFDM symbols and one CP and one CS.

Since the RS time domain sequence carried by each third OFDM symbol in a basic resource is the same, the RS in a basic resource satisfies the cyclic characteristics in the time domain; but in the continuous Z basic resources, even if the RS sequence carried Similarly, because the CP and/or CS in each basic resource are added separately, the overall cycle characteristics are destroyed. For example, take a basic resource structure as an example. As shown in Figure 10, each basic resource includes multiple RS sequences and one CP, and each basic resource includes the same RS sequence, that is, "12345678" from the time domain. ". After each basic resource is added with a CP, the sent RS is "5678-12345678-12345678", which is cyclic in one basic resource, but the RS "5678-12345678-12345678-5678-12345678-" in the two basic resources "12345678" is not cyclic, and the cyclic characteristics of the two basic resources need to be in the form of "12345678-12345678-12345678-12345678". Because the cyclic characteristics between the two basic resources are destroyed, when the detection window of the receiving end observes the RS between the two basic resources, it is still unable to effectively perform blind detection through the frequency domain correlation method.

Based on this, the solution provided by the embodiments of the present application can solve the problem that the cycle characteristics of multiple basic resources are destroyed.

The base station 1 at the transmitting end may carry the reference signal on multiple basic resources and send it to the base station 2 at the receiving end. For example, the base station 1 carries the reference signal on Z consecutive basic resources for transmission. The continuity mentioned here refers to continuity in the time domain. In addition, on the one hand, the fourth OFDM symbol involved in the embodiments of the present application may be an OFDM symbol added with a CP, on the other hand, the fourth OFDM symbol may also be an OFDM symbol added with a cyclic suffix (CS).

The following describes the relationship between the reference signals respectively carried by the Z continuous basic resources in the time domain and the frequency domain.

First, take the structure of the first basic resource as an example, that is, only include the basic resources of the CP, and explain from the time domain:

From a time domain perspective, among the Z consecutive basic resources, the reference signal included in the first basic resource is the same as the signal obtained by performing a W-long cyclic shift on the reference signal included in the second basic resource. The first basic resource and the second basic resource are any two basic resources among the Z consecutive basic resources.

It should be understood that a feasible understanding is that the reference signal carried by the basic resource in the embodiment of this application refers to the reference signal carried by the symbol part included in the basic resource, that is, the reference signal carried by the Y third OFDM symbols included in the basic resource In another feasible understanding, the reference signal carried by the basic resource in the embodiment of the present application refers to the reference signal carried by any third OFDM symbol among the Y third OFDM symbols included in the basic resource.

If the first basic resource is later than the second basic resource in the time domain, the cyclic shift is a cyclic left shift. W can be based on the CP length of the basic resource between the first basic resource and the second basic resource and the CP of the first basic resource The length is determined.

If the first basic resource is earlier than the second basic resource in the time domain, the cyclic shift is a cyclic right shift. W can be based on the CP length of the basic resource between the first basic resource and the second basic resource and the CP of the second basic resource The length is determined.

In a possible example, the first basic resource and the second basic resource are two adjacent basic resources in the time domain, and then the two adjacent basic resources in the time domain, the latter basic resource bears The reference signal of is the same as the signal obtained by cyclic shifting (circular shifting to the left) of the reference signal carried by the previous basic resource, and the length of the cyclic shift is determined by the CP length of the basic resource.

Exemplarily, the CP length of the basic resource is the CP length of the latter basic resource among the two adjacent basic resources.

Wherein, the latter and the former refer to the time before and after.

If the CP length from the second basic resource to the Z-th basic resource is the same among the Z basic resources, for example, all are L, the length of the cyclic shift of the reference signal carried by the previous basic resource is L, that is, the previous The reference signal carried by one basic resource is cyclically shifted (circularly shifted to the left) by L bits, and the signal obtained is the same as the reference signal carried by the latter basic resource.

In another possible example, among the Z consecutive basic resources, the reference signal carried by the u-th basic resource and the reference signal carried by the v-th basic resource are cyclically shifted by (uv)·L. Same, u is an integer greater than 1 and less than or equal to Z, v is an integer greater than or equal to 1 and less than u, and L is the CP length of the basic resource. For example, when v=1, the reference signal carried by the u-th basic resource and the reference signal carried by the first basic resource are subjected to (u-1)·L-long cyclic shift (circular shift left) to obtain the same signal. The CP length of the 2 to Zth basic resources is L.

In another possible example, among the Z consecutive basic resources, the reference signal carried by the u-th basic resource is performed with the reference signal carried by the v-th basic resource.

The signals obtained by the long cyclic shift are the same, Ln is the CP length of the n-th basic resource, u is an integer greater than 1 and less than or equal to Z, and v is an integer greater than or equal to 1 and less than u. For example, when v=1, the reference signal carried by the u-th basic resource is compared with the reference signal carried by the first basic resource.

Long cyclic shift (circular shift left) results in the same signal.

Exemplarily, referring to Figure 11, taking Z=2, Y=2, and L=4 as an example, the second basic resource is later than the first basic resource when the first basic resource is connected to the second basic resource Later, in order to ensure that the entire sequence still satisfies the cyclic characteristics, the RS time domain sequence of the second basic resource needs to be equal to the L=4 point cyclic shift of the RS time domain sequence "12345678" of the first basic resource, that is, "56781234" . Through the cyclic shift, the entire RS included in the first basic resource and the second basic resource satisfies the cyclic characteristic in the time domain.

The above conclusion can also be extended to the case where the reference signal is mapped to multiple basic resources. The application principle of the solution of the present application is the same as the above, and will not be repeated here.

Secondly, take the structure of the second basic resource as an example, that is, only the basic resource of CS, which is explained from the time domain:

If the first basic resource is later than the second basic resource in the time domain, the cyclic shift is a cyclic left shift, and W can be determined according to the CS length of the second basic resource and the CS length between the first basic resource and the second basic resource.

If the first basic resource is earlier than the second basic resource in the time domain, the cyclic shift is a cyclic right shift. W can be based on the CS length of the first basic resource and the CS of the basic resource between the first basic resource and the second basic resource. The length is determined.

In a possible example, the first basic resource and the second basic resource are two adjacent basic resources in the time domain, and then the two adjacent basic resources in the time domain, the latter basic resource bears The reference signal of is the same as the signal obtained by cyclic shifting (circular shifting to the left) of the reference signal carried by the previous basic resource, and the length of the cyclic shift is determined by the CS length of the basic resource.

Exemplarily, the CS length of the basic resource is the CS length of the previous basic resource in the two adjacent basic resources.

Wherein, the latter and the former refer to the time before and after.

If among the Z basic resources, the CS length from the first basic resource to the Z-1th basic resource is the same, for example, all are J, then the cyclic shift length of the reference signal carried by the previous basic resource is J, That is, the signal obtained by the cyclic shift (circular left shift) of the reference signal carried by the previous basic resource by J bits is the same as the reference signal carried by the latter basic resource.

In another possible example, among the Z consecutive basic resources, the reference signal carried by the u-th basic resource and the reference signal carried by the v-th basic resource are cyclically shifted by (uv)·J length. Same, u is an integer greater than 1 and less than or equal to Z, v is an integer greater than or equal to 1 and less than u, and J is the CS length of the basic resource. For example, when v=1, the reference signal carried by the u-th basic resource and the reference signal carried by the first basic resource are cyclically shifted (u-1)·J length (circular shift left) to obtain the same signal. The CS length of the 1st to Z-1th basic resources is J.

The signals obtained by the long cyclic shift are the same, Jn is the CS length of the n-th basic resource, u is an integer greater than 1 and less than or equal to Z, and v is an integer greater than or equal to 1 and less than u. For example, when v=1, the reference signal carried by the u-th basic resource is compared with the reference signal carried by the first basic resource.

Long cyclic shift (circular shift left) results in the same signal.

Again, take the structure of the third basic resource as an example, that is, take the basic resource including CP and CS as an example to illustrate from the time domain:

If the first basic resource is later than the second basic resource in the time domain, the cyclic shift is a cyclic left shift. W can be based on the CS length of the second basic resource, and the CP of the basic resource between the first basic resource and the second basic resource. The length and the CS length and the CP length of the first basic resource are determined.

If the first basic resource is earlier than the second basic resource in the time domain, the cyclic shift is a cyclic right shift. W can be based on the CS length of the first basic resource and the CP of the basic resource between the first basic resource and the second basic resource. The length and the CS length and the CP length of the second basic resource are determined.

In a possible example, the first basic resource and the second basic resource are two adjacent basic resources in the time domain, and then the two adjacent basic resources in the time domain, the latter basic resource bears The reference signal of is the same as the signal obtained by cyclic shifting (circular shifting to the left) of the reference signal carried by the previous basic resource, and the length of the cyclic shift is determined by the CP length and CS length of the basic resource.

Exemplarily, the CP length of the basic resource is the CP length of the latter one of the two adjacent basic resources, and the CS length of the basic resource is the former one of the two adjacent basic resources The CS length of the basic resource.

Wherein, the latter and the former refer to the time before and after.

If Z basic resources, the CP length from the second basic resource to the Zth basic resource is the same, for example, all are L, and the CS length from the first basic resource to the Z-1th basic resource is the same For example, both are J, the length of the cyclic shift of the reference signal carried by the previous basic resource is L+J, that is, the signal obtained by cyclic shifting (circular left shift) the reference signal carried by the previous basic resource by L+J bits It is the same as the reference signal carried by the latter basic resource.

In another possible example, among the Z consecutive basic resources, the reference signal carried by the u-th basic resource and the reference signal carried by the v-th basic resource perform a (uv)·(L+J) long cyclic shift. The signals obtained by the bits are the same, u is an integer greater than 1 and less than or equal to Z, v is an integer greater than or equal to 1 and less than u, L is the CP length of the basic resource, and L is the CS length of the basic resource. For example, when v=1, the reference signal carried by the u-th basic resource and the reference signal carried by the first basic resource are cyclically shifted (u-1)·(L+J) long (circular shift left) The signals are the same, the CP lengths of the 2nd to Zth basic resources are all L, and the CS lengths of the 1st to Z-1th basic resources are all J.

The signals obtained by the long cyclic shift are the same, Ln is the CP length of the n-th basic resource, Jn is the CS length of the n-th basic resource, u is an integer greater than 1 and less than or equal to Z, and v is greater than or equal to 1. And an integer less than u. For example, when v=1, the reference signal carried by the u-th basic resource is compared with the reference signal carried by the first basic resource.

Long cyclic shift (circular shift left) results in the same signal.

Exemplarily, referring to Fig. 12, taking Z=2, Y=2, L=2, and J=2 as an example, the second basic resource is later than the first basic resource, when the first basic resource and the first basic resource After the two basic resources are connected, in order to ensure that the sequence as a whole still meets the cyclic characteristics, the RS time domain sequence of the second basic resource needs to be equal to the RS time domain sequence of the first basic resource "12345678". L+J=4 point cyclic shift Bit, which is "56781234". Through the cyclic shift, the entire RS included in the first basic resource and the second basic resource satisfies the cyclic characteristic in the time domain.

The application is described in the time domain above, and the description in the frequency domain is below:

In the frequency domain, in the Z consecutive basic resources, the phase of the reference signal carried on the first subcarrier of the first basic resource and the phase of the reference signal carried on the first subcarrier of the second basic resource The phase difference between is determined by the index of the first subcarrier, where the first basic resource and the second basic resource are any two basic resources of the Z consecutive basic resources, and Z is greater than or An integer equal to 2. It should be noted that one basic resource includes multiple third OFDM symbols, and one third OFDM symbol occupies multiple subcarriers in the frequency domain, and the number of subcarriers occupied is related to the system bandwidth. The first subcarrier is a third OFDM symbol that occupies any one of the multiple subcarriers in the frequency domain.

First, take the structure of the first basic resource as an example, that is, the basic resource includes CP but does not include CS. Figure 13 shows a schematic diagram of the time domain and frequency domain of a basic resource carrying reference signal. Illustratively, Y=2. The RS frequency domain sequence is carried on subcarriers. Illustratively, S(k) represents the RS carried on subcarrier k, and k=0,1,...,7. Since the reference signals carried on the multiple third OFDM symbols included in a basic resource are all the same, the reference signal on the subcarrier k of a basic resource can be regarded as the reference signal on the subcarrier k of any OFDM symbol in the basic resource. Reference signal.

In a feasible implementation manner, for the basic resource including CP, the phase of the reference signal carried on the first subcarrier of the first basic resource and the reference signal carried on the first subcarrier of the second basic resource The phase difference between the phases of the signals is also determined by the symbol length of the third OFDM symbol and/or the cyclic prefix CP length of the basic resource.

Exemplarily, taking a basic resource including a CP as an example, the first basic resource is separated from the second basic resource by X basic resources, and the first basic resource is earlier than the second basic resource in the time domain, so The X is an integer greater than or equal to 0; the CP length of the basic resource is determined by the CP length of the X basic resources and the CP length of the second basic resource. For example, the first basic resource is adjacent to the second basic resource, and the CP length of the basic resource is the CP length of the second basic resource. For example, if the first basic resource and the second basic resource are separated by two basic resources, the CP length of the basic resource is determined according to the CP length of the separated two basic resources and the CP length of the second basic resource. Among them, a feasible method is that the phase difference is determined by the sum of the CP length of the two basic resources that are spaced apart and the CP length of the second basic resource.

In another feasible implementation manner, for the basic resource including CP, among the Z consecutive basic resources, any two adjacent basic resources are carried on the first subcarrier of the latter basic resource The phase difference between the phase of the reference signal and the phase of the reference signal carried on the first subcarrier of the previous basic resource is 2πLk/N, where N is the symbol length of the third OFDM symbol, and L is the basic resource The CP length of, k is the index of the first subcarrier. Exemplarily, L is the CP length of the latter basic resource.

In yet another feasible implementation manner, for the basic resource including CP, among the Z consecutive basic resources, the phase and the phase of the reference signal carried on the first subcarrier of the u-th basic resource are The phase difference between the phases of the reference signals on the first subcarrier of the v-th basic resource is

Exemplarily, taking a basic resource including a CP as an example, among the Z consecutive basic resources, the CP length of the second to the Zth basic resources is the same, and they are all L, then they are carried on the u-th basic resource The phase difference between the phase of the reference signal on the first subcarrier and the phase of the reference signal carried on the first subcarrier of the first basic resource is

That is, 2π(u-1)Lk/N, where k is the index of the first subcarrier, and N is the symbol length of the third OFDM symbol.

Exemplarily, a basic resource includes two third OFDM symbols, and each third OFDM symbol occupies 8 subcarriers as an example. As shown in FIG. 14, the first basic resource has 8 subcarriers on the third OFDM symbol. The RSs carried are S(0), S(1), S(2), ..., S(7). According to the solution provided by the embodiment of this application, the RSs carried on the 8 subcarriers of the third OFDM symbol of the second basic resource are respectively S(0)*exp(i*0*2πL/N), S(1) *exp(i*1*2πL/N), S(2)*exp(i*2*2πL/N),..., S(7)*exp(i*7*2πL/N), the third basic The RSs carried on the 8 subcarriers of the OFDM symbol of the resource are respectively S(0)*exp(i*2*0*2πL/N), S(1)*exp(i*2*1*2πL/N), S(2)*exp(i*2*2*2πL/N),..., S(7)*exp(i*2*7*2πL/N). Among them, exp(x) represents e ^x .

Secondly, take the structure of the second basic resource as an example, that is, the basic resource includes CS.

For basic resources including CS, the phase difference between the phase of the reference signal carried on the first subcarrier of the first basic resource and the phase of the reference signal carried on the first subcarrier of the second basic resource is also It is determined by the symbol length of the third OFDM symbol and/or the CS length of the basic resource.

For basic resources including CS, among the Z consecutive basic resources, any two adjacent basic resources, the phase of the reference signal carried on the first subcarrier of the latter basic resource and the phase of the reference signal carried on the previous one The phase difference between the phases of the reference signals on the first subcarrier of the basic resource is 2πLk/N, where N is the symbol length of the third OFDM symbol, L is the CS length of the basic resource, and k is the first The index of the subcarrier. Exemplarily, L is the CS length of the previous basic resource.

For basic resources including CS, among the Z consecutive basic resources, the phase of the reference signal carried on the first subcarrier of the u-th basic resource and the first subcarrier carried on the v-th basic resource The phase difference between the phases of the reference signal is

Where N is the symbol length of the third OFDM symbol, Ln is the CS length of the nth basic resource, u is an integer greater than 1 and less than or equal to Z, v is an integer greater than or equal to 1 and less than u , K is the index of the first subcarrier.

Secondly, take the structure of the third basic resource as an example, that is, the basic resource includes CS and CP.

For basic resources including CP and CS, the phase between the phase of the reference signal carried on the first subcarrier of the first basic resource and the phase of the reference signal carried on the first subcarrier of the second basic resource The difference is also determined by the symbol length of the third OFDM symbol and/or the CP length of the basic resource and the CS length. For basic resources including CP and CS, among the Z consecutive basic resources, any two adjacent basic resources, the phase and the phase of the reference signal carried on the first subcarrier of the latter basic resource The phase difference between the phases of the reference signals on the first subcarrier of the previous basic resource is 2π(L+J)k/N, where N is the symbol length of the third OFDM symbol, and L is the CP of the basic resource Length, J is the CS length of the basic resource, and k is the index of the first subcarrier. Exemplarily, L is the CP length of the next basic resource, and J is the CS length of the previous basic resource.

For basic resources including CP and CS, among the Z consecutive basic resources, the phase of the reference signal carried on the first subcarrier of the u-th basic resource and the first subcarrier carried on the v-th basic resource The phase difference between the phases of the reference signals on the subcarriers is

Exemplarily, taking basic resources including CP and CS as an example, among the Z consecutive basic resources, the CP lengths of the second to Zth basic resources are the same, and they are all L, and the first to Zth basic resources -1 basic resources have the same CS length and are all J, then the phase of the reference signal carried on the first subcarrier of the u-th basic resource and the reference carried on the first subcarrier of the first basic resource The phase difference between the phases of the signal is

That is, 2π(u-1)(L+J)k/N, where k is the index of the first subcarrier, and N is the length of the third OFDM symbol that does not include CP or CS.

It should be noted that the above is based on the previous basic resource. "The RS of the latter basic resource is multiplied by one in the frequency domain.

“Linear phase”, but it can also be based on the latter basic resource. “The RS of the former basic resource is multiplied by one in the frequency domain.

"Linear phase", the essence of the two is the same, that is, the phase difference between the RS on the subcarrier index k in the two adjacent basic resources is

It should be understood that since the length of the third OFDM symbol is the same as the length of the fourth OFDM symbol excluding the CP of the fourth OFDM symbol, in the above, the phase difference of the reference signal on the first subcarrier of different basic resources It can be determined not only according to the length of the third OFDM symbol, but also according to the length of the fourth OFDM symbol. For example, if the length of the third OFDM symbol is N, the length of the fourth OFDM symbol is Ncp, and the CP length of the fourth OFDM symbol is Lcp, then N=Ncp−Lcp.

For the principle that the cyclic shift of the basic resource in the time domain will appear in the frequency domain as the linear phase offset of the corresponding frequency domain signal (that is, the phase difference value and the index k of the subcarrier are linear), in It has been introduced above, so I won't repeat it here.

For the base station that sends the reference signal, the reference signal carried on different basic resources can be linear phase compensated in the frequency domain to achieve an effect equivalent to the time domain cyclic shift; the base station that sends the reference signal sends the reference signal , So that the base station receiving the reference signal can detect the reference signal in a frequency-domain correlation manner. Among them, the transmitting base station may first generate a reference signal carried on one basic resource, and then generate the reference signal carried on other basic resources according to the relationship between the reference signals in the different basic resources described in the embodiment of this application in the time domain/frequency domain Or, the sending base station may directly generate reference signals carried on multiple basic resources according to the time-domain/frequency-domain relationship of reference signals between different basic resources described in the embodiments of this application, or The reference signal is generated in other ways, which is not limited in this application.

In addition, in the embodiment of the present application, the RS used for measurement between base stations may not occupy all subcarriers of one OFDM symbol in the frequency domain. For example, the total number of subcarriers in an OFDM symbol is N, and the RS may only occupy M subcarriers, and M≤N. However, the phase difference between two OFDM symbols on the same subcarrier is related to the length N of an OFDM symbol. Generally, the number of time domain samples of an OFDM symbol is the same as the total number of subcarriers, so the phase difference can also be considered to be related to the total number of subcarriers N of an OFDM symbol.

Generally, the frequency domain resources occupied by the RSs on the front and back two OFDM symbols or the front and back two RSs on the basic resources are the same frequency domain resources, that is, carried on the same subcarrier. If the number of subcarriers carrying the reference signal is less than the number of subcarriers of the OFDM symbol, other subcarriers may carry other signals, such as data signals between the base station and the user equipment. If other signals carried on different OFDM symbols are not the same, the time domain signal superimposed in the time domain by all the subcarriers of the OFDM symbol may not meet the cyclic characteristics, but only the subcarrier carrying the reference signal is superimposed in the time domain The time-domain signal still satisfies the cycle characteristics, so the reference signal can still be detected by blind detection.

The embodiments of the present application are also applicable to situations where the frequency domain resources occupied by the RSs on the two OFDM symbols before and after or the RSs on the basic resources are different. For example, referring to FIG. 8, the first OFDM symbol occupies the first subcarrier-the fourth carrier, and the second OFDM symbol occupies the fifth subcarrier-the eighth subcarrier. As another example, referring to FIG. 8, the first OFDM symbol occupies the first subcarrier-the sixth carrier, and the second OFDM symbol occupies the third subcarrier-the eighth subcarrier.

The specific sequence of measuring RS is not limited in the embodiment of this application. For example, the RS may be a pseudo-random sequence based on the Gold sequence and QPSK modulation, or a low peak to average power ratio (PAPR) sequence based on the ZadOff-Chu (ZC) sequence. In particular, if the RS is a ZC sequence or a low peak-to-average ratio sequence based on the ZC sequence, due to the characteristics of the sequence, the RS dot multiplies the linear phase

It is also equivalent to the L point cyclic shift of RS. For example, if the RS signal is carried on each of the M consecutive OFDM symbols, the CP length of the 2nd to Mth OFDM symbols is all L, and it is carried on the kth subcarrier of the 1st OFDM symbol RS is S(k), then the RS carried on subcarrier k of the mth OFDM symbol is S(k+(m-1)*L), that is, S(k+(m-1)*L) and

equal.

If the distance between base station 1 and base station 2 is long, base station 1 transmits on downlink symbols, and base station 2 may need to receive on the guard interval and/or uplink OFDM symbols due to time delay.

See Figure 15:

S901: Base station 1 sends a reference signal to base station 2 on the second resource. Among them, the second resource is a downlink transmission resource.

The first way is: the second resource includes M consecutive downlink OFDM symbols. The M consecutive downlink OFDM symbols satisfy the above-mentioned relationship in the time domain and/or frequency domain, and will not be repeated here.

The second way is that the second resource includes Z continuous basic resources; the Z continuous basic resources satisfy the above-mentioned relationship in the time domain and/or the frequency domain, which will not be repeated here. The OFDM symbols included in the basic resources are downlink OFDM symbols.

S902: The base station 2 determines a first resource for receiving a reference signal, where the first resource includes an uplink OFDM symbol and/or a guard interval.

S903: The base station 2 receives a reference signal on the first resource.

Optionally, for the first manner, before S901, the base station 1 generates a sequence corresponding to the reference signal.

The sequence corresponding to the reference signal may be a sequence mapped to an OFDM symbol or basic resource, based on the relationship between different OFDM symbols or between different basic resources in the time domain and/or frequency domain described in the embodiments of this application In this way, sequences on other OFDM symbols or sequences on other basic resources can be generated.

It is also possible to directly generate sequences mapped to M OFDM symbols or Z basic resources according to the relationship between different OFDM symbols or basic resources in the time domain and/or frequency domain described in the embodiments of the present application.

For the second resource described in the first manner, the base station 1 sending the reference signal to the base station 2 on the second resource includes:

The base station 1 maps the sequence corresponding to the reference channel to resource elements (resource elements, RE) (k, l) of M consecutive OFDM symbols. k represents the subcarrier index, and l represents the OFDM symbol index.

Exemplarily, the reference signal sequence a(k,l) carried on RE(k,l) satisfies the condition shown in formula (12):

Where j is

l _start is the index of the l-th OFDM symbol among the M OFDM symbols carrying the RS,

Represents the length of the CP corresponding to the l-th OFDM symbol,

Indicates the bandwidth of the system, that is, the total number of subcarriers in an OFDM symbol. There is a certain correspondence between k and k', for example, k'=m*k+k _offset , where m and k _offset are predefined or configurable values. Exemplarily, m=1 and k _offset =0, at this time k′=k.

Regarding the second resource described in the second manner, the base station 1 sends a reference signal to the base station 2 on the second resource, including:

The base station 1 maps the sequence corresponding to the reference channel to the resource element (k, l') of each third OFDM symbol in the Z consecutive basic resources. k represents the subcarrier index, and l'represents the basic resource index.

Exemplarily, the reference signal sequence a(k, l') carried on RE(k, l') satisfies the condition shown in formula (13):

Where j is

l' _start is the index of the l'th elementary resource among the Z _elements carrying RS,

Represents the length of the CP corresponding to the l'th basic resource,

In a feasible implementation manner, the base station 1 and the base station 2 participating in the measurement may adopt the same transmission and reception time configuration. The sending and receiving time configuration information includes at least one of the following: uplink and downlink switching cycle, the latest downlink transmission time, and the earliest uplink reception time. The base station 2 can determine the transceiver time configuration according to the transceiver time configuration information, and determine the start time of the blind RS.

The time domain position of the reference signal sent between the base stations can also be the same time domain position, so that when the base station 2 receives and blindly detects an RS, the interference range can be determined according to the fixed time domain position, so as to determine the need for interference. The range of resources to be eliminated, and the distance between the interference source (base station 1) and the local station can be calculated more conveniently, which is beneficial to locate the interference source base station. See Figure 16.

In the embodiment of the present application, M OFDM symbols carrying RS may occupy the last M symbols of the downlink transmission time, or alternatively, Z basic resources carrying RS may occupy the last Z basic resources of the downlink transmission time. Taking M OFDM symbols carrying RSs can occupy the last M symbols of the downlink transmission time as an example, on the one hand, the maximum range of interference can be determined, because RS is already the last M symbols of downlink transmission, so after base station 2 detects RS , It can be determined that the range behind the time domain position where the RS is located is not interfered by base station 1, so that interference cancellation measures can be further applied, such as lower-order modulation and lower code rate for the area interfered by CLI. ; On the other hand, the detection success rate can be guaranteed to the greatest extent. As shown in Figure 17, if the RS is not in the last M symbols of the DL part, it is possible that the RS is still in the DL area after the delay, causing the interfered station to fail The RS is detected. In this case, the DL part of the interferer base station 1 still produces out-of-way interference to the UL part of the interfered base station 2.

Based on this, optionally, in S901, before base station 1 sends a reference signal to base station 2 on the second resource, the method further includes:

S904: The base station 1 and/or the base station 2 receive the transceiver time configuration information.

The sending and receiving time configuration information can be notified to the receiving base station 2 by the base station 1, or the receiving base station 1 is notified by the base station 2; or, the sending and receiving time configuration information can also be configured by the higher-level control node to the base station 1 and/or the base station 2. Yes, or the engineer configured it in base station 1 and/or base station 2 during network deployment. When the base station 2 receives the reference signal on the first resource, the base station 2 can generate RS1 locally, and use the local RS1 to perform frequency domain cross-correlation with the received reference signal, and then perform the inverse Fourier of the frequency domain cross-correlation result The leaf transform is transformed to the time domain to obtain the correlation peak; when the correlation peak exceeds a certain threshold, the base station 2 can determine that the reference signal RS1 sent from the base station 1 is received.

As an example, referring to FIG. 18, base station 1 sends the downlink OFDM symbols used by RS1. Due to the long distance between base station 1 and base station 2, resulting in time delay, base station 1 detects reference signals on the uplink OFDM.

In addition, the execution time of step S903 in the above steps can be earlier than step S901. Since base station 1 is far away from base station 2, and the tropospheric bending effect affects signal propagation, base station 2 is not sure when the reference signal from base station 1 will arrive. Therefore, the base station 2 can detect whether there is RS1 on all symbols that may receive the reference signal. In this case, step S903 can be performed earlier than step S901. However, although base station 2 can start detection as early as possible, base station 2 can only detect RS1 sent by base station 1 after RS1 of base station 1 reaches base station 2.

The design of the reference signal between the long-distance base stations provided in the embodiments of the present application can also be applied to the measurement scenario between neighboring base stations (base stations that are closer). In the measurement scenario of neighboring base stations, the time delay due to geographic distance can be ignored. For example, base station 1 and base station 3 are two adjacent base stations, and the time when base station 1 sends the reference signal can be considered as the time when base station 3 receives the reference signal.

See Figure 19:

S1301. Base station 1 sends a reference signal on the second resource. Among them, the second resource is a downlink transmission resource.

The second resource includes M consecutive downlink OFDM symbols, or the second resource includes a guard interval (GP). Or, the second resource includes Z consecutive basic resources. The OFDM symbols included in the basic resources are downlink OFDM symbols.

Exemplarily, reference signals carried by M continuous OFDM symbols or Z continuous basic resources satisfy the above-mentioned relationship in the time domain and/or frequency domain, and details are not described herein again.

S1302: The base station 3 determines the first resource for receiving the reference signal according to the obtained first information. Wherein, the first information includes time-frequency resource location information used to carry the reference signal. That is, the first information includes the time domain resource and/or frequency domain resource location of the second resource.

The first information may be notified by the base station 1 to the receiving base station 3, or configured by the higher-level control node to the base station 3, or configured in the base station 3 by the engineer during network deployment.

S1303: The base station 3 receives the reference signal on the first resource.

In a possible implementation manner, the base station 3 may also obtain second information, where the second information includes the reference signal, or parameter information required for generating the reference signal; thus, it is determined based on the second information The reference signal is received on the first resource, or channel estimation is performed according to the second information and the received reference signal.

Among them, the first information and the second information can be included in the same configuration information, sent by base station 1 to base station 3, can also be configured to base station 3 by a higher-level control node, or configured in base station 3 by an engineer during network deployment . The first information and the second information may also be included in different configuration information, which are sent by the base station 1 to the base station 3 through the same message or different messages, and may also be configured by the higher-level control node to the base station 3 through the same message or different messages.

Exemplarily, the parameter information required to generate the reference signal may be, for example, the initial phase of the Gold sequence, the root sequence of the ZC sequence, and so on. The base station 3 may receive the reference signal (as a local reference signal), or locally generate the same reference signal as the reference signal sent by the base station 1 (the generated reference signal is used as the local reference signal). On the one hand, by performing cross-correlation between the local reference signal and the received signal, it can be detected whether the transmitting base station has transmitted the RS. On the other hand, the base station 3 can perform channel estimation based on the local reference signal and the received signal (including the RS sent by the base station 1).

For example, referring to FIG. 20A, the base station 1 transmits the reference signal in the GP, and the base station 3 receives the reference signal in the GP.

In Figure 20A, DL symbols and UL symbols are for terminal equipment, and terminal equipment usually does not send and receive in GP; therefore, when measuring between base stations, RS can be sent and received within the GP range. The RS will not cause interference to the data sent by the terminal equipment and the data that the UE needs to receive.

For another example, referring to FIG. 20B, base station 1 occupies M downlink OFDM symbols to send reference signals, and base station 3 receives reference signals in the GP. Therefore, it can be ensured that the RS sent from the base station 1 will not interfere with the uplink part of the base station 3.

In the embodiment of the present application, the ultra-long-distance interference measurement and the adjacent base station interference measurement can reuse the same RS, as shown in FIG. 20C. Base station 1 sends the same RS to base station 2 and base station 3, which is used for ultra-long-distance measurement and measurement between neighboring base stations; for base station 3, since it is a neighboring station, it can be determined according to base station 1. The transmission time determines the reception time. It is not necessary to perform "blind" detection in all GP and/or UL areas; for the measurement between base station 1 and base station 3, it is necessary to perform "blind" detection in the UL area. The reference signal carried in the time domain satisfies the relevant description of the relationship in the time domain and/or the frequency domain, which is not repeated here.

The communication device according to the embodiment of the present application will be described in detail below with reference to FIGS. 21A, 21B, and 22.

Based on the same inventive concept as the foregoing method embodiment, referring to FIG. 21A, a schematic structural diagram of an apparatus provided in an embodiment of this application may include a transceiver unit 1510 and a processing unit 1520.

In a possible implementation manner, the device may be applied to the base station of the sender, and the transceiver unit 1510 may be used to send a reference signal to the base station of the receiver, or receive transmission and reception time configuration information sent by a higher-level control node. Exemplarily, the transceiver unit 1510 executes step S901 or S1301. The processing unit 1520 can be used to generate reference signals, etc. The specific processing unit 1510 can be used to implement the functions performed by the base station 1 in the embodiment corresponding to FIG. 15 or FIG. 19.

In a possible implementation manner, the device may be used in the base station of the receiver, the transceiver unit 1510, to receive the reference signal sent by the base station of the receiver, or receive the transceiver time configuration information sent by the higher-level control node, or receive the first information, Second information and so on. Exemplarily, the transceiver unit 1510 may be used to perform step S903 or step 1303. The processing unit 1520 may be used to determine resources for receiving reference signals, or determine an interfering base station according to the received reference signals, or perform channel estimation, etc. For example, the processing unit 1520 may be used to perform step S902 or step S1302. The specific processing unit 1510 may be used to implement the functions performed by the base station 2 in the embodiment corresponding to FIG. 15 or FIG. 19.

FIG. 21B is a schematic structural diagram of a network device provided by an embodiment of the present application, for example, it may be a schematic structural diagram of a base station. As shown in FIG. 21B, the base station can be applied to the system shown in FIG. 1 to perform the functions of the network device (or base station) in the foregoing method embodiment. The base station 150 may include one or more radio frequency units, such as a remote radio unit (RRU) 1501 and one or more baseband units (BBU) (also referred to as digital units, digital units, DU) 1502. The RRU 1501 may be called a transceiver unit, a transceiver, a transceiver circuit, or a transceiver, etc., and it may include at least one antenna 15011 and a radio frequency unit 15012. The RRU 1501 part is mainly used for receiving and sending of radio frequency signals and conversion of radio frequency signals and baseband signals, for example, for sending the reference signals described in the foregoing embodiments to terminal equipment. The BBU 1502 part is mainly used to perform baseband processing, control the base station, and so on. The RRU 1501 and the BBU 1502 may be physically set together, or may be physically separated, that is, a distributed base station.

The BBU 1502 is the control center of the base station, and may also be called a processing unit, which is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, and spreading. For example, the BBU (processing unit) 1502 may be used to control the base station to execute the operation procedure of the network device (or base station) in the foregoing method embodiment.

In an example, the BBU 1502 may be composed of one or more single boards, and multiple single boards may jointly support a radio access network (such as an LTE network or 5G network) with a single access indication, or may support different Access standard wireless access network (such as LTE network, 5G network or other networks). The BBU 1502 also includes a memory 15021 and a processor 15022, and the memory 15021 is used to store necessary instructions and data. The processor 15022 is used to control the base station to perform necessary actions, for example, to control the base station to execute the operation procedure of the network device (or the base station) in the foregoing method embodiment. The memory 15021 and the processor 15022 may serve one or more single boards. In other words, the memory and the processor can be set separately on each board. It can also be that multiple boards share the same memory and processor. In addition, necessary circuits can be provided on each board.

FIG. 22 shows a schematic structural diagram of a communication device 1600. The apparatus 1600 may be used to implement the method described in the foregoing method embodiment, and reference may be made to the description in the foregoing method embodiment. The communication device 1600 may be a chip, a network device (such as a base station), or the like.

The communication device 1600 includes one or more processors 1601. The processor 1601 may be a general-purpose processor or a special-purpose processor. For example, it can be a baseband processor or a central processing unit. The baseband processor can be used to process communication protocols and communication data, and the central processor can be used to control communication devices (such as base stations, terminals, or chips), execute software programs, and process data in the software programs. The communication device may include a transceiving unit to implement signal input (reception) and output (transmission). For example, the communication device may be a chip, and the transceiver unit may be an input and/or output circuit of the chip, or a communication interface. The chip can be used in a terminal or a base station or other network equipment. For another example, the communication device may be a base station or a network device, and the transceiver unit may be a transceiver, a radio frequency chip, or the like.

The communication device 1600 includes one or more of the processors 1601, and the one or more processors 1601 may implement the base station (base station 1, base station 2, or base station 3) in the embodiment shown in FIG. 15 or FIG. Method of execution.

In a possible design, the communication device 1600 includes a means for generating a reference signal and a means for sending a reference signal. The functions of the means for generating the reference signal and the means for sending the reference signal may be realized by one or more processors. For example, the reference signal may be generated by one or more processors, and the reference signal may be transmitted through a transceiver, or an input/output circuit, or an interface of a chip. For the reference signal, refer to the related description in the foregoing method embodiment.

In a possible design, the communication device 1600 includes means for receiving reference signals. For example, the reference signal may be received through a transceiver, or an input/output circuit, or an interface of a chip.

Optionally, the processor 1601 may implement other functions in addition to implementing the method of the embodiment shown in FIG. 15 or FIG. 19.

Optionally, in a design, the processor 1601 may execute instructions to enable the communication device 1600 to execute the method described in the foregoing method embodiment. The instructions may be stored in the processor in whole or in part, such as the instruction 1603, or in the memory 1602 coupled to the processor, in whole or in part, such as the instruction 1604, or the

instructions

1603 and 1604 may be used together to make The communication device 1600 executes the method described in the foregoing method embodiment.

In another possible design, the communication device 1600 may also include a circuit, and the circuit may implement the function of the network device (or base station) in the foregoing method embodiment.

In another possible design, the communication device 1600 may include one or more memories 1602, on which instructions 1604 are stored, and the instructions may be executed on the processor, so that the communication device 1600 can execute The method described in the above method embodiment. Optionally, data may also be stored in the memory. The optional processor may also store instructions and/or data. For example, the one or more memories 1602 may store the corresponding relationship described in the foregoing embodiment, or related parameters or tables involved in the foregoing embodiment. The processor and memory can be provided separately or integrated together.

In another possible design, the communication device 1600 may further include a transceiver unit 1605 and an antenna 1606. The processor 1601 may be called a processing unit, and controls a communication device (terminal or base station). The transceiving unit 1605 may be called a transceiver, a transceiving circuit, or a transceiver, etc., and is used to implement the transceiving function of the communication device through the antenna 1606.

The application also provides a communication system, which includes the aforementioned multiple network devices (or base stations). It may also include one or more terminal devices.

It should be noted that the processor in the embodiment of the present application may be an integrated circuit chip with signal processing capability. In the implementation process, the steps of the foregoing method embodiments can be completed by hardware integrated logic circuits in the processor or instructions in the form of software. The above-mentioned processor may be a general-purpose processor, a digital signal processor (digital signal processor, DSP), an application specific integrated circuit (ASIC), a ready-made programmable gate array (field programmable gate array, FPGA) or other Programming logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like. The steps of the method disclosed in combination with the embodiments of the present application may be directly embodied as being executed and completed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

It can be understood that the memory in the embodiments of the present application may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. Among them, the non-volatile memory can be read-only memory (ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), and electrically available Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory. The volatile memory may be random access memory (RAM), which is used as an external cache. By way of exemplary but not restrictive description, many forms of RAM are available, such as static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection dynamic random access memory (synchlink DRAM, SLDRAM) ) And direct memory bus random access memory (direct rambus RAM, DR RAM). It should be noted that the memories of the systems and methods described herein are intended to include, but are not limited to, these and any other suitable types of memories.

The embodiment of the present application also provides a computer-readable medium on which a computer program is stored, and when the computer program is executed by a computer, the communication method described in any of the above method embodiments is implemented.

The embodiments of the present application also provide a computer program product, which, when executed by a computer, implements the communication method described in any of the foregoing method embodiments.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in the form of a computer program product in whole or in part. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center. Transmission to another website, computer, server, or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center integrated with one or more available media. The usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a high-density digital video disc (digital video disc, DVD)), or a semiconductor medium (for example, a solid state disk, SSD)) etc.

An embodiment of the present application also provides a processing device, including a processor and an interface; the processor is configured to execute the communication method described in any of the foregoing method embodiments.

It should be understood that the foregoing processing device may be a chip, and the processor may be implemented by hardware or software. When implemented by hardware, the processor may be a logic circuit, an integrated circuit, etc.; when implemented by software, At this time, the processor may be a general-purpose processor, which is realized by reading the software code stored in the memory, and the memory may be integrated in the processor, may be located outside the processor, and exist independently.

It should be understood that "one embodiment" or "an embodiment" mentioned throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present application. Therefore, appearances of "in one embodiment" or "in an embodiment" in various places throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in the various embodiments of the present application, the size of the sequence numbers of the foregoing processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not correspond to the embodiments of the present application. The implementation process constitutes any limitation.

In addition, the terms "system" and "network" in this article are often used interchangeably in this article. The term "and/or" in this article is only an association relationship describing the associated objects, which means that there can be three relationships, for example, A and/or B, which can mean: A alone exists, A and B exist at the same time, exist alone B these three situations. In addition, the character "/" in this text generally indicates that the associated objects before and after are in an "or" relationship.

It should be understood that in the embodiments of the present application, "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B according to A does not mean that B is determined only according to A, and B can also be determined according to A and/or other information.

A person of ordinary skill in the art may be aware that the units and algorithm steps of the examples described in the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two, in order to clearly illustrate the hardware and software Interchangeability. In the above description, the composition and steps of each example have been generally described in accordance with the function. Whether these functions are performed by hardware or software depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and conciseness of description, the specific working process of the system, device and unit described above can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, device, and method may be implemented in other ways. For example, the device embodiments described above are merely illustrative, for example, the division of units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or integrated. To another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may also be electrical, mechanical or other forms of connection.

The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments of the present application.

In addition, the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or software functional unit.

Through the description of the foregoing implementation manners, those skilled in the art can clearly understand that this application can be implemented by hardware, firmware, or a combination thereof. When implemented by software, the above functions can be stored in a computer-readable medium or transmitted as one or more instructions or codes on the computer-readable medium. The computer-readable medium includes a computer storage medium and a communication medium, where the communication medium includes any medium that facilitates the transfer of a computer program from one place to another. The storage medium may be any available medium that can be accessed by a computer. Take this as an example but not limited to: computer readable media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage media or other magnetic storage devices, or can be used to carry or store instructions or data structures The desired program code and any other medium that can be accessed by the computer. In addition. Any connection can suitably become a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable , Fiber optic cable, twisted pair, DSL or wireless technologies such as infrared, wireless and microwave are included in the fixing of the media. As used in this application, Disk and disc include compact discs (CD), laser discs, optical discs, digital versatile discs (DVD), floppy discs and Blu-ray discs. Discs usually copy data magnetically, while discs The laser is used to optically copy data. The above combination should also be included in the protection scope of the computer-readable medium.

Obviously, those skilled in the art can make various changes and modifications to the application without departing from the scope of the application. In this way, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, then this application is also intended to include these modifications and variations.

Claims

A method for sending a reference signal, characterized in that it comprises:

Sending reference signals carried on M consecutive orthogonal frequency division multiplexing OFDM symbols;

Wherein, among the M consecutive OFDM symbols, the difference between the phase of the reference signal carried on the first subcarrier of the first OFDM symbol and the phase of the reference signal carried on the first subcarrier of the second OFDM symbol The phase difference is determined by the index of the first subcarrier, where the first OFDM symbol and the second OFDM symbol are any two OFDM symbols among the M consecutive OFDM symbols, and M is greater than or equal to 2 Integer.
The method of claim 1, further comprising:

In the M consecutive OFDM symbols, the phase difference between the phase of the reference signal carried on the first subcarrier of the first OFDM symbol and the phase of the reference signal carried on the first subcarrier of the second OFDM symbol Is w1, the phase difference between the phase of the reference signal carried on the second subcarrier of the first OFDM symbol and the phase of the reference signal carried on the second subcarrier of the second OFDM symbol is w2, The phase difference between the phase of the reference signal carried on the third subcarrier of the first OFDM symbol and the phase of the reference signal carried on the third subcarrier of the second OFDM symbol is w3, which is carried on the The phase difference between the phase of the reference signal on the fourth subcarrier of the first OFDM symbol and the phase of the reference signal carried on the fourth subcarrier of the second OFDM symbol is w4;

If the difference between the index of the second subcarrier and the index of the first subcarrier is equal to the difference between the index of the fourth subcarrier and the index of the third subcarrier, then the value of (w2-w1) mod 2π is equal to (w4-w3 ) The value modulo 2π.
The method according to claim 1 or 2, characterized in that:

The phase difference between the phase of the reference signal carried on the first subcarrier of the first OFDM symbol and the phase of the reference signal carried on the first subcarrier of the second OFDM symbol is also determined by the symbol length of the OFDM symbol and/or The CP length of the cyclic prefix of the OFDM symbol is determined.
The method of claim 3, wherein:

The first OFDM symbol and the second OFDM symbol are separated by X OFDM symbols, the first OFDM symbol is earlier than the second OFDM symbol in the time domain, and the X is an integer greater than or equal to 0; the OFDM The CP length of the symbol is determined by the CP length of the X OFDM symbols and the CP length of the second OFDM symbol.
The method according to any one of claims 1 to 4, characterized in that:

Among the M consecutive OFDM symbols, any two adjacent OFDM symbols, the phase of the reference signal carried on the first subcarrier of the next OFDM symbol and the phase of the reference signal carried on the first subcarrier of the previous OFDM symbol The phase difference between the phases of the reference signals is 2πLk/N, where N is the symbol length of the OFDM symbol, L is the CP length of the OFDM symbol, and k is the index of the first subcarrier.
The method according to any one of claims 1 to 4, characterized in that:

Among the M consecutive OFDM symbols, the difference between the phase of the reference signal carried on the first subcarrier of the uth OFDM symbol and the phase of the reference signal carried on the first subcarrier of the vth OFDM symbol The phase difference is
Where N is the symbol length of the OFDM symbol, Ln is the CP length of the nth OFDM symbol, u is an integer greater than 1 and less than or equal to M, v is an integer greater than or equal to 1 and less than u, k Is the index of the first subcarrier.
The method according to any one of claims 1 to 6, wherein the M consecutive OFDM symbols are the last M OFDM symbols of the downlink transmission part of the uplink-downlink switching period.
A method for receiving a reference signal, characterized in that it includes:

Determining a first resource for receiving a reference signal, where the first resource includes an uplink OFDM symbol and/or a guard interval;

A reference signal is received on the first resource; the reference signal is sent through a second resource, and the second resource includes M consecutive downlink OFDM symbols; wherein, among the M consecutive downlink OFDM symbols, The phase difference between the phase of the reference signal carried on the first subcarrier of the first OFDM symbol and the phase of the reference signal carried on the first subcarrier of the second OFDM symbol is determined by the index of the first subcarrier, where The first OFDM symbol and the second OFDM symbol are OFDM symbols of any two of the M consecutive downlink OFDM symbols, and M is an integer greater than or equal to 2.
The method of claim 8, further comprising:

In the M consecutive OFDM symbols, the phase difference between the phase of the reference signal carried on the first subcarrier of the first OFDM symbol and the phase of the reference signal carried on the first subcarrier of the second OFDM symbol Is w1, the phase difference between the phase of the reference signal carried on the second subcarrier of the first OFDM symbol and the phase of the reference signal carried on the second subcarrier of the second OFDM symbol is w2, The phase difference between the phase of the reference signal carried on the third subcarrier of the first OFDM symbol and the phase of the reference signal carried on the third subcarrier of the second OFDM symbol is w3, which is carried on the The phase difference between the phase of the reference signal on the fourth subcarrier of the first OFDM symbol and the phase of the reference signal carried on the fourth subcarrier of the second OFDM symbol is w4;

If the difference between the index of the second subcarrier and the index of the first subcarrier is equal to the difference between the index of the fourth subcarrier and the index of the third subcarrier, then the value of (w2-w1) mod 2π is equal to (w4-w3 ) The value modulo 2π.
The method according to claim 8 or 9, characterized in that:

The phase difference between the phase of the reference signal carried on the first subcarrier of the first OFDM symbol and the phase of the reference signal carried on the first subcarrier of the second OFDM symbol is also determined by the symbol length of the OFDM symbol and/or The CP length of the cyclic prefix of the OFDM symbol is determined.
The method of claim 10, wherein:

The first OFDM symbol and the second OFDM symbol are separated by X OFDM symbols, the first OFDM symbol is earlier than the second OFDM symbol in the time domain, and the X is an integer greater than or equal to 0; the OFDM The CP length of the symbol is determined by the CP length of the X OFDM symbols and the CP length of the second OFDM symbol.
The method according to any one of claims 8-11, wherein:

Among the M consecutive OFDM symbols, any two adjacent OFDM symbols, the phase of the reference signal carried on the first subcarrier of the next OFDM symbol and the phase of the reference signal carried on the first subcarrier of the previous OFDM symbol The phase difference between the phases of the reference signals is 2πLk/N, where N is the symbol length of the OFDM symbol, L is the CP length of the OFDM symbol, and k is the index of the first subcarrier.
The method according to any one of claims 8-11, wherein:

Among the M consecutive OFDM symbols, the difference between the phase of the reference signal carried on the first subcarrier of the uth OFDM symbol and the phase of the reference signal carried on the first subcarrier of the vth OFDM symbol The phase difference is
Where N is the symbol length of the OFDM symbol, Ln is the CP length of the nth OFDM symbol, u is an integer greater than 1 and less than or equal to M, v is an integer greater than or equal to 1 and less than u, k Is the index of the first subcarrier.
The method according to any one of claims 8-13, wherein the M consecutive OFDM symbols are the last M OFDM symbols of the downlink transmission part of the uplink-downlink switching period.
A method for sending a reference signal, characterized in that it comprises:

Sending reference signals carried on M consecutive orthogonal frequency division multiplexing OFDM symbols;

Wherein, among the M consecutive OFDM symbols, any two adjacent OFDM symbols are in the time domain, and the reference signal carried by the part excluding the CP on the latter OFDM symbol and the part excluding the CP on the previous OFDM symbol. The signal obtained by cyclic shifting the reference signal of the reference signal is the same, and the length of the cyclic shift is determined by the cyclic prefix CP length of the OFDM symbol.
The method of claim 15, wherein:

The CP length of the OFDM symbol is the CP length of the last OFDM symbol among the two adjacent OFDM symbols.
The method according to claim 15 or 16, wherein, among the M consecutive OFDM symbols, the reference signal carried by the part of the u-th OFDM symbol excluding the CP and the reference signal carried by the part excluding the CP of the v-th OFDM symbol The signals obtained by performing a cyclic shift of (uv)·L length are the same, u is an integer greater than 1 and less than or equal to M, v is an integer greater than or equal to 1 and less than u, and L is the CP length of the OFDM symbol.
The method according to claim 15, wherein, among the M consecutive OFDM symbols, the reference signal carried by the part excluding the CP of the u-th OFDM symbol and the reference signal carried by the part excluding the CP of the v-th OFDM symbol get on
The signals obtained by the long cyclic shift are the same, Ln is the CP length of the nth OFDM symbol, u is an integer greater than 1 and less than or equal to M, and v is an integer greater than or equal to 1 and less than u.
The method according to any one of claims 15-18, wherein the M consecutive OFDM symbols are the last M OFDM symbols of the downlink transmission part of the uplink-downlink switching period.
A method for receiving a reference signal, characterized in that it includes:

Determining a first resource for receiving a reference signal, where the first resource includes an uplink OFDM symbol and/or a guard interval;

A reference signal is received on the first resource; the reference signal is sent through a second resource, and the second resource includes M consecutive downlink OFDM symbols; wherein, among the M consecutive OFDM symbols, any For two adjacent OFDM symbols, in the time domain, the reference signal carried by the part excluding the CP on the latter OFDM symbol is the same as the signal obtained by cyclic shifting the reference signal carried by the part excluding the CP on the previous OFDM symbol. The length of the cyclic shift is determined by the cyclic prefix CP length of the OFDM symbol.
The method of claim 20, wherein:

The CP length of the OFDM symbol is the CP length of the last OFDM symbol among the two adjacent OFDM symbols.
The method according to claim 20 or 21, wherein, among the M consecutive OFDM symbols, the reference signal carried by the part excluding the CP of the u-th OFDM symbol and the reference signal carried by the part excluding the CP of the v-th OFDM symbol The signals obtained by performing a cyclic shift of (uv)·L length are the same, u is an integer greater than 1 and less than or equal to M, v is an integer greater than or equal to 1 and less than u, and L is the CP length of the OFDM symbol.
The method according to claim 20, wherein, among the M consecutive OFDM symbols, the reference signal carried by the part excluding the CP of the u-th OFDM symbol and the reference signal carried by the part excluding the CP of the v-th OFDM symbol get on
The signals obtained by the long cyclic shift are the same, Ln is the CP length of the nth OFDM symbol, u is an integer greater than 1 and less than or equal to M, and v is an integer greater than or equal to 1 and less than u.
The method according to any one of claims 20-23, wherein the M consecutive OFDM symbols are the last M OFDM symbols of the downlink transmission part of the uplink-downlink switching period.
A method for receiving a reference signal, characterized in that it includes:

Determine the first resource for receiving the reference signal according to the obtained first information; wherein the first information includes time domain resource and/or frequency domain resource location information for carrying the reference signal;

Receiving a reference signal on the first resource.
The method of claim 25, further comprising:

Obtaining second information, where the second information includes the reference signal or parameter information required for generating the reference signal;

It is determined according to the second information that the reference signal is received on the first resource, or channel estimation is performed according to the second information and the received reference signal.
The method according to claim 25 or 26, wherein the first resource includes a guard time interval, or the first resource includes M downlink OFDM symbols.
A method for sending a reference signal, characterized in that it comprises:

Sending reference signals carried on Z consecutive basic resources;

The basic resource includes Y consecutive third orthogonal frequency division multiplexing OFDM symbols, and a cyclic prefix CP and/or a cyclic suffix CS; wherein, one of the basic resources includes Y third OFDM symbols. The reference signals carried are the same; the third OFDM symbol does not include CP;

Wherein, in the Z consecutive basic resources, the phase of the reference signal carried on the first subcarrier of the first basic resource and the phase of the reference signal carried on the first subcarrier of the second basic resource are between The phase difference is determined by the index of the first subcarrier, where the first basic resource and the second basic resource are any two basic resources among the Z consecutive basic resources, and Z and Y are greater than or equal to An integer of 2.
The method of claim 28, further comprising:

In the Z consecutive basic resources, the phase difference between the phase of the reference signal carried on the first subcarrier of the first basic resource and the phase of the reference signal carried on the first subcarrier of the second basic resource Is w1, the phase difference between the phase of the reference signal carried on the second subcarrier of the first basic resource and the phase of the reference signal carried on the second subcarrier of the second basic resource is w2, The phase difference between the phase of the reference signal carried on the third subcarrier of the first basic resource and the phase of the reference signal carried on the third subcarrier of the second basic resource is w3, which is carried on all The phase difference between the phase of the reference signal on the fourth subcarrier of the first basic resource and the phase of the reference signal carried on the fourth subcarrier of the second basic resource is w4;

If the difference between the index of the second subcarrier and the index of the first subcarrier is equal to the difference between the index of the fourth subcarrier and the index of the third subcarrier, then the value of (w2-w1) mod 2π is equal to (w4-w3 ) The value modulo 2π.
The method according to claim 28 or 29, wherein when the basic resource only includes Y consecutive third OFDM symbols and one CP, the reference signal carried on the first subcarrier of the first basic resource The phase difference between the phase of and the phase of the reference signal carried on the first subcarrier of the second basic resource is also determined by the symbol length of the third OFDM symbol and/or the CP length of the basic resource.
The method of claim 30, wherein:

The first basic resource and the second basic resource are separated by X basic resources, the first basic resource is earlier than the second basic resource in the time domain, and the X is an integer greater than or equal to 0; The CP length of the resource is determined by the CP length of the X basic resources and the CP length of the second basic resource.
The method according to any one of claims 28-31, wherein when the basic resource only includes Y consecutive third OFDM symbols and one cyclic prefix CP, among the Z consecutive basic resources , The phase difference between the phase of the reference signal carried on the first subcarrier of any two adjacent basic resources and the phase of the reference signal carried on the first subcarrier of the previous basic resource Is 2πLk/N, where N is the symbol length of the third OFDM symbol, L is the CP length of the basic resource, and k is the index of the first subcarrier.
The method according to any one of claims 28-32, wherein when the basic resources only include Y consecutive third OFDM symbols and one cyclic prefix CP, among the Z consecutive basic resources , The phase difference between the phase of the reference signal carried on the first subcarrier of the u-th basic resource and the phase of the reference signal carried on the first subcarrier of the v-th basic resource is
Where N is the symbol length of the third OFDM symbol, Ln is the CP length of the nth basic resource, u is an integer greater than 1 and less than or equal to Z, v is an integer greater than or equal to 1 and less than u , K is the index of the first subcarrier.
The method according to claim 28 or 29, wherein when the basic resource only includes Y consecutive third OFDM symbols and one CS, the reference carried on the first subcarrier of the first basic resource The phase difference between the phase of the signal and the phase of the reference signal carried on the first subcarrier of the second basic resource is also determined by the symbol length of the third OFDM symbol and/or the CS length of the basic resource.
The method of claim 34, wherein:

The first basic resource and the second basic resource are separated by X basic resources, the first basic resource is earlier than the second basic resource in the time domain, and the X is an integer greater than or equal to 0; The CS length of the resource is determined by the CS length of the X basic resources and the CS length of the first basic resource.
The method according to any one of claims 28-29 and 34-35, wherein when the basic resource only includes Y consecutive third OFDM symbols and one CS, the Z consecutive basic resources In the resources, any two adjacent basic resources, the phase of the reference signal carried on the first subcarrier of the following basic resource and the phase of the reference signal carried on the first subcarrier of the previous basic resource The phase difference is 2πJk/N, where N is the symbol length of the third OFDM symbol, J is the CS length of the basic resource, and k is the index of the first subcarrier.
The method according to any one of claims 28-29 and 34-35, wherein when the basic resource only includes Y consecutive third OFDM symbols and one CS, the Z consecutive basic resources In the resources, the phase difference between the phase of the reference signal carried on the first subcarrier of the u-th basic resource and the phase of the reference signal carried on the first subcarrier of the v-th basic resource is
Where, N is the symbol length of the third OFDM symbol, Jn is the CS length of the n-th basic resource, u is an integer greater than 1 and less than or equal to Z, v is an integer greater than or equal to 1 and less than u , K is the index of the first subcarrier.
The method according to claim 28 or 29, wherein when the basic resource includes Y consecutive third OFDM symbols, one CS, and one CP, the data carried on the first subcarrier of the first basic resource The phase difference between the phase of the reference signal and the phase of the reference signal carried on the first subcarrier of the second basic resource is also determined by the symbol length of the third OFDM symbol, the CS length of the basic resource, and the CP length of the basic resource.
The method of claim 38, wherein:

The first basic resource and the second basic resource are separated by X basic resources, the first basic resource is earlier than the second basic resource in the time domain, and the X is an integer greater than or equal to 0; The CS length of the resource is determined by the CS length of the X basic resources and the CS length of the first basic resource, and the CP length of the basic resource is determined by the CP length of the X basic resources and the CP of the second basic resource The length is determined.
The method according to any one of claims 28-29 and 38-39, wherein when the basic resource includes Y consecutive third OFDM symbols, one CS and one CP, the Z consecutive Among the basic resources, any two adjacent basic resources are between the phase of the reference signal carried on the first subcarrier of the latter basic resource and the phase of the reference signal carried on the first subcarrier of the previous basic resource The phase difference is 2π(L+J)k/N, where N is the symbol length of the third OFDM symbol, L is the CP length of the basic resource, J is the CS length of the basic resource, and k is the first sub The index of the carrier.
The method according to any one of claims 28-29 and 38-39, wherein when the basic resources include Y consecutive third OFDM symbols, one CS, and one CP, the Z consecutive In the basic resources, the phase difference between the phase of the reference signal carried on the first subcarrier of the u-th basic resource and the phase of the reference signal carried on the first subcarrier of the v-th basic resource is
Where N is the symbol length of the third OFDM symbol, Ln is the CP length of the n-th basic resource, Jn is the CS length of the n-th basic resource, u is greater than 1 and less than or equal to Z An integer, v is an integer greater than or equal to 1 and less than u, and k is the index of the first subcarrier.
The method according to any one of claims 28-41, wherein the Z consecutive basic resources are the last Z basic resources of the downlink transmission part of the uplink-downlink switching period.
A device, characterized by being used to execute the method according to any one of claims 1-42.
A device, characterized by comprising: a processor, which is coupled with a memory;

Memory, used to store computer programs;

The processor is configured to execute the computer program stored in the memory, so that the device executes the method according to any one of claims 1-42.
A readable storage medium, characterized by comprising a program or instruction, when the program or instruction runs on a computer, the method according to any one of claims 1-42 is executed.