WO2022205022A1

WO2022205022A1 - Method and apparatus for transmitting reference signal

Info

Publication number: WO2022205022A1
Application number: PCT/CN2021/084207
Authority: WO
Inventors: 曲秉玉; 高翔; 张哲宁; 刘鹍鹏
Original assignee: 华为技术有限公司
Priority date: 2021-03-30
Filing date: 2021-03-30
Publication date: 2022-10-06
Also published as: CN117121414A

Abstract

Provided are a method and apparatus for transmitting a reference signal, applicable to the field of wireless communications. The method may comprise: designing check sequences having different lengths for distinguishing an original port and a newly-added port; and multiplexing semi-orthogonal or low-cross-correlated DMRS ports without increasing time-frequency resources. The port capacity is expanded, the interference between the original port and the newly-added port in a protocol is minimized, and the quality of channel estimation is guaranteed. The method and apparatus provided for transmitting the reference signal satisfy the system requirement for the number of ports when the number of antennas suddenly increases, and improve the flexibility and efficiency of information transmission.

Description

Method and apparatus for transmitting a reference signal

technical field

The present application relates to the field of communications, and more particularly, to a method and apparatus for transmitting a reference signal.

Background technique

Demodulation reference signal (DeModulation Reference Signal, DMRS) is used to estimate the equivalent channel experienced by data channel (such as Physical downlink shared channel, PDSCH) or control channel (such as Physical downlink control channel, PDCCH) matrix for data detection and demodulation. Currently, 5G NR supports two types of DMRS resource mapping. For Type 1 (Type 1) DMRS, a maximum of 8 orthogonal ports can be supported; for Type 2 (Type 2) DMRS, a maximum of 12 orthogonal ports can be supported. With the more intensive deployment of wireless communication equipment in the future, the number of terminal equipment will further increase. With the continuous evolution of the Multiple Input Multiple Output Massive MIMO system, the number of transmitting and receiving antennas will further increase (the number of transmitting antennas for network equipment supports 128T or 256T, and the number of receiving antennas for terminals supports 128T or 256T). 8R), more DMRS ports are bound to support a higher number of transport streams (greater than 12 streams).

Since different DMRS ports rely on time division multiplexing, frequency division multiplexing or code division multiplexing to achieve orthogonality, and time-frequency resources and orthogonal codeword sets are limited, the easiest way to expand the number of existing orthogonal DMRS ports is The method is to increase the time-frequency resources occupied by the DMRS. This method can ensure that the number of resources occupied by the DMRS symbols corresponding to each DMRS port remains unchanged, however, the increase of the DMRS overhead will reduce the spectral efficiency of the system. Another method is to multiplex more DMRS symbols corresponding to non-orthogonal DMRS ports under the condition of ensuring the same time-frequency resources (overhead). However, the superposition of non-orthogonal ports will inevitably bring some interference, which will lead to system performance loss. Therefore, how to increase a certain number of DMRS ports without increasing additional time-frequency resource overhead and ensure less damage to channel estimation performance is a problem to be solved.

SUMMARY OF THE INVENTION

The present application provides a method and apparatus for transmitting a reference signal, which can support more DMRS ports without increasing additional time-frequency resource overhead, improve system capacity, and ensure less damage to channel estimation performance.

A first aspect provides a method for transmitting a reference signal, the method may include: sending a first reference signal on a first resource; sending a second reference signal on a second resource, wherein the first resource corresponds to the first resource a time domain resource and a first frequency domain resource, the second resource corresponds to the first time domain resource and the second frequency domain resource, and the first frequency domain resource is smaller than the second frequency domain resource.

It should be understood that the first reference signal and the second reference signal may represent one or more reference signal symbols, the one or more reference signal symbols are mapped to one or more time-frequency resources, and the reference signal may correspond to one or more ports , which is not limited in this application. The first reference signal may correspond to an existing port, and the second reference signal may correspond to a newly added port.

In a possible manner, the first reference signal corresponds to a first sequence, the second reference signal corresponds to a second sequence, and the number of elements included in the first sequence is smaller than the number of elements included in the second sequence .

In a possible manner, the first sequence belongs to a first sequence set, the second sequence belongs to a second sequence set, the first sequence set includes at least one sequence, and the second sequence set includes at least one sequence, The sequences included in the first sequence set include the same number of elements, and the sequences included in the second sequence set include the same number of elements.

In a possible manner, the average value of multiple values formed by the cross-correlation coefficient between any sequence in the first sequence set and any sequence in the second sequence set is less than or equal to the first threshold.

In a possible manner, the cross-correlation coefficient between any sequence in the first sequence set and any sequence in the second sequence set is less than or equal to a first threshold, that is, the Each sequence has a low cross-correlation with each sequence in the second set of sequences.

One possible way, the first threshold can be

In a possible manner, the first reference signal is generated according to the first sequence and the third sequence; the second reference signal is generated according to the second sequence and the fourth sequence. The third sequence and the fourth sequence may be base sequences of reference signals, respectively. The base sequence of the reference signal may be a pseudo-random sequence, such as a gold sequence or the like.

The above technical solution makes the sequences included in the two sequence sets exhibit low cross-correlation, that is, low cross-correlation between the DMRS signal corresponding to the existing port and the DMRS signal corresponding to any newly added port, thus ensuring that the existing The reusability of the port and the newly added port ensures that the interference between the DMRS signal corresponding to the existing DMRS port and the DMRS signal corresponding to the newly added port is minimized.

In one possible way, the first sequence and the second sequence may be mask sequences.

In a possible manner, the first sequence and the second sequence may be orthogonal mask sequences.

In a possible manner, the first sequence set includes multiple orthogonal mask sequences, the second sequence set includes multiple orthogonal mask sequences, and the multiple sequences included in the first sequence set are orthogonal to each other , the multiple sequences included in the second sequence set are orthogonal to each other.

In one example, there is a low cross-correlation between the first sequence and the second sequence.

In a possible way, the low cross-correlation between sequences can be characterized by a cross-correlation coefficient, for example, the cross-correlation coefficient between the first sequence and the second sequence is less than or equal to a first threshold.

As another example, the cross-correlation coefficient can be determined by a vector formed by the elements of the sequence. For example, the cross-correlation coefficient can be calculated by the following formula,

Among them, ρ is the cross-correlation coefficient, L ₁ and L ₂ can be vectors composed of sequence elements of two sequences to be calculated, H can represent the conjugate transpose, which means the conjugate transpose of the matrix L ₂ or the vector L ₂ , L _{1 ·} L ₂ means that the vector L ₁ and the vector L ₂ are multiplied.

In yet another example, the sequence length of the first sequence is different from the sequence length of the second sequence, which can be expressed as a multiple relationship. As yet another example, the sequence length of the second sequence may be three times the sequence length of the first sequence. The sequence length may be determined according to the number of elements included in the sequence.

In yet another example, the first sequence may be a sequence corresponding to an existing port, and the second sequence may be a sequence corresponding to a newly added port.

The above technical solution provides the characterization of the cross-correlation between sequences, and also provides its calculation method. In addition, sequences with different lengths are designed to generate different reference signals, the same resource is reused, the number of ports is increased, and the number of ports is guaranteed. lower interference.

In a possible manner, when the first sequence set includes at least two sequences, the sequences included in the first sequence set are orthogonal to each other, and when the second sequence set includes at least two sequences, the second sequence set includes The sequences of are orthogonal to each other.

The above technical solution ensures the orthogonality between sequences within each sequence set, that is, there is no interference between DMRS signals corresponding to existing ports, and no interference between DMRS signals corresponding to newly added ports.

In another possible manner, the cross-correlation coefficient between any sequence in the first sequence set and any sequence in the first subset of the second sequence set is zero, and the cross-correlation coefficient between any sequence in the second sequence set and the second sequence set is zero. The average value of a plurality of numerical values formed by the cross-correlation coefficients between any sequences included except the first subset is less than or equal to the second threshold.

It should be understood that the cross-correlation coefficient between any sequence in the first sequence set and any sequence in the first subset of the second sequence set is zero can also be understood as being zero in the first sequence set. Any sequence is orthogonal to any sequence in the first subset of the second set of sequences.

In a possible manner, the cross-correlation coefficient between any sequence in the first sequence set and any sequence included in the second sequence set except the first subset is less than or equal to the The second threshold, that is, a low cross-correlation between each sequence in the first set of sequences and any sequence included in the second set of sequences except the first subset.

One possible way, the second threshold can be

It should be understood that the first threshold and the second threshold may be configured by a high layer, and may also be predefined, which is not limited in this application.

A possible example, the first subset may include half of the sequences in the second set of sequences, that is, any sequence in the first set of sequences and half of the sequences in the second set of sequences are mutually orthogonal, and The remaining half of the series showed low cross-correlation.

The above technical solution further realizes that the DMRS signals corresponding to the existing ports and the DMRS signals corresponding to half of the newly added ports are orthogonal to each other on the basis of ensuring low cross-correlation between the existing ports and the newly added ports, thereby ensuring the least damage to the channel estimation performance. .

In another possible manner, the reference signal sequence of the second reference signal may satisfy the following relationship:

reference signal sequence of the second reference signal

elements mapped on the kth subcarrier and the lth symbol

Satisfy the following relationship:

where k is an integer from 0 to K-1, and K is

The total number of subcarriers occupied in the frequency domain, l is 0 or 1, β is a non-zero complex number, the number of elements included in the mask sequence w is I, and i satisfies i=k mod(I/2)+l· (I/2) or i=(k mod(I/2))·2+l,r(k,l) is the element of the base sequence r mapped on the kth subcarrier and the lth symbol, c(t ) is a block sequence, and t satisfies t=floor(k/(I/2)).

In another possible manner, the sequences included in the second sequence set may be generated according to the first matrix and the second matrix. A possible way is generated according to the following formula:

in,

An example, the mask sequence of length 12 generated according to this formula is shown in Table 3, which can include

or

An example, the mask sequence of length 12 generated according to this formula is shown in Table 4, which can include:

or

An example, the mask sequence of length 12 generated according to this formula is shown in Table 5, which can include:

{1,j,1,j,1,j,1,j,1,j,1,j},

{1,-j,1,-j,1,-j,1,-j,1,-j,1,-j},

{1,j,1,j,1,j,-1,-j,-1,-j,-1,-j},

{1,-j,1,-j,1,-j,-1,j,-1,j,-1,j},

Another possible way is generated according to the following formula:

An example, the mask sequence of length 12 generated according to this formula is shown in Table 10, which can include:

or,

An example, the mask sequence of length 12 generated according to this formula is shown in Table 11, which can include:

Another possible way, the generated mask sequences with length 8 are shown in Tables 14, 15, and 16.

The above technical solutions provide a method for generating a mask sequence and elements specifically included in the mask sequence, which provide a basis for the application of the mask sequence.

A possible way, when the mask sequence length is 12, the first resource includes 4 resource elements RE, the first time domain resource includes 2 OFDM symbols, and the first frequency domain resource includes 2 consecutive , the second resource includes 12 REs, the second resource includes the 2 OFDM symbols, the second frequency domain resource includes 6 consecutive subcarriers, and the first frequency domain resource is When the subset of the second frequency domain resources, that is, the DMRS sequences corresponding to the existing ports and the DMRS sequences corresponding to the newly added ports are mapped, a part of the frequency domain resources are multiplexed.

In another possible manner, the first resource includes four resource elements RE, the first time domain resource includes two OFDM symbols, the first frequency domain resource includes two consecutive subcarriers, and the first time domain resource includes two consecutive subcarriers. The second resource includes 8 REs, the second time domain resource includes the 2 OFDM symbols, the second frequency domain resource includes 4 consecutive subcarriers, the first frequency domain resource and the second frequency domain resource include 4 consecutive subcarriers. The intersection of domain resources is empty, that is, when the DMRS sequence corresponding to the existing port and the DMRS sequence corresponding to the newly added port are mapped, the frequency domain resources are not multiplexed.

The time domain resource may be the first symbol, and the first symbol may include one symbol or multiple symbols.

The frequency domain resources may be subcarriers.

That is, the sequence elements corresponding to the newly added ports may reuse the resources mapped by the sequence elements corresponding to the existing ports, or may not reuse the resources mapped by the sequence elements corresponding to the existing ports.

The above technical solution provides a way of using resources of existing ports and newly-added ports, which can be divided or reused, which improves the flexibility of resource use.

In a possible manner, the elements included in any sequence in the first sequence set are in a one-to-one correspondence with the resource elements RE included in the first resource, and the elements included in any sequence in the second sequence set are in one-to-one correspondence. The elements are in one-to-one correspondence with the REs included in the second resource,

That is, taking 12 REs consisting of 6 consecutive subcarriers and 2 OFDM symbols as an example of resources to be mapped, and taking a sequence with a length of 12 as an example, 12 elements included in any sequence are sequentially mapped to the 12 REs above; taking a sequence with a length of 8 as an example, the 8 elements included in any sequence are sequentially mapped to 8 REs other than the 4 REs occupied by the existing ports.

The above technical solution provides a method for mapping elements on resources. The elements included in one mask sequence are distributed on multiple REs, so that the joint noise reduction effect of multiple REs can be obtained and the accuracy of channel estimation can be improved.

In a second aspect, a method for transmitting a reference signal is provided, the method may include: receiving a first reference signal on a first resource; receiving a second reference signal on a second resource, wherein the first resource corresponds to the first resource a time domain resource and a first frequency domain resource, the second resource corresponds to the first time domain resource and the second frequency domain resource, and the first frequency domain resource is smaller than the second frequency domain resource.

It should be understood that the first reference signal and the second reference signal may represent one or more reference signal symbols, the one or more reference signal symbols are mapped to one or more time-frequency resources, and the reference signal may correspond to one or more ports , which is not limited in this application.

One possible way, the first threshold can be

In a possible manner, the low cross-correlation can be characterized by a cross-correlation coefficient, for example, the cross-correlation coefficient between the first sequence and the second sequence is less than or equal to a first threshold.

The above technical solution provides the characterization of the cross-correlation between sequences, and also provides its calculation method. In addition, sequences with different lengths are designed to generate different reference signals, the same resource is reused, the number of ports is increased, and the number of ports is also guaranteed. lower interference.

One possible way, the second threshold can be

It should be understood that the first threshold and the second threshold may be configured by a high layer or defined manually, which is not limited in this application.

As a possible example, the first subset may include half of the sequences in the second set of sequences.

That is, any sequence in the first sequence set is mutually orthogonal to half of the sequences in the second sequence set, and has low cross-correlation with the remaining half of the sequences.

The above technical solution further realizes that the DMRS signals corresponding to the existing ports and the DMRS signals corresponding to half of the newly added ports are orthogonal to each other on the basis of ensuring low cross-correlation between the existing ports and the newly added ports, thereby ensuring the minimum loss of channel estimation performance. .

In another possible manner, the reference signal sequences of the second reference signal may respectively satisfy the following relationship:

reference signal sequence of the second reference signal

elements mapped on the kth subcarrier and the lth symbol

Satisfy the following relationship:

where k is an integer from 0 to K-1, and K is

In another possible manner, when the sequence included in the second sequence set is a mask sequence, the sequence may be generated according to the first matrix and the second matrix.

A possible way is generated according to the following formula:

in,

or

or

{1,j,1,j,1,j,1,j,1,j,1,j},

{1,-j,1,-j,1,-j,1,-j,1,-j,1,-j},

{1,j,1,j,1,j,-1,-j,-1,-j,-1,-j},

{1,-j,1,-j,1,-j,-1,j,-1,j,-1,j},

Another possible way is generated according to the following formula:

or,

In another possible manner, the number of elements included in the second sequence is 8, the first resource includes 4 resource elements RE, the first time domain resource includes 2 OFDM symbols, and the first resource includes 2 OFDM symbols. The frequency domain resource includes 2 consecutive subcarriers, the second resource includes 8 REs, the second time domain resource includes the 2 OFDM symbols, and the second frequency domain resource includes 4 consecutive subcarriers , the intersection of the first frequency domain resource and the second frequency domain resource is empty, that is, when the DMRS sequence corresponding to the existing port and the DMRS sequence corresponding to the newly added port are mapped, the frequency domain resources are not multiplexed.

The frequency domain resources may be subcarriers.

In a third aspect, a communication device is provided, which is characterized by comprising a processing unit configured to determine a first resource and a second resource; a transceiver unit configured to send a first reference signal on the first resource, and send a first reference signal on the second resource. sending a second reference signal on the Time domain resources, including the second frequency domain resources in the frequency domain, the first frequency domain resources are a part of the second frequency domain resources, or, the first frequency domain resources and the second frequency domain resources Domain resource intersection is empty. .

In a possible manner, when the first sequence set includes at least two sequences and the second sequence set includes at least two sequences, the sequences included in the first sequence set are orthogonal to each other, and the second sequence set includes at least two sequences. The sequences included in the sequence set are orthogonal to each other.

In a possible manner, the number of elements included in the second sequence is 12.

A possible way, the reference signal sequence of the second reference signal

elements mapped on the kth subcarrier and the lth symbol

Satisfy the following relationship:

where k is an integer from 0 to K-1, and K is

In a possible manner, any sequence included in the first sequence set is orthogonal to any sequence included in the first subset included in the second sequence set.

In a possible manner, the sequences included in the first subset are half of the sequences included in the second sequence set.

A possible way is to use the sequences included in the second sequence set as a matrix composed of row vectors

Satisfy the following relationship:

where w _k is the row vector corresponding to the kth sequence contained in the second sequence set, k is an integer from 0 to N-1, and b satisfies the following relationship:

or,

or,

Satisfy the following relationship:

or,

where w _k is the row vector corresponding to the kth sequence contained in the second sequence set, and k is an integer from 0 to N-1.

In a possible manner, the first resource includes four resource elements RE, the first time domain resource includes two OFDM symbols, the first frequency domain resource includes two consecutive subcarriers, and the second The resource includes 12 REs, the second resource includes the 2 OFDM symbols, the second frequency domain resource includes 6 consecutive subcarriers, and the first frequency domain resource is the second frequency domain resource. Subset.

In a possible manner, the number of elements included in the second sequence is 8.

In a possible manner, the first resource includes four resource elements RE, the first time domain resource includes two OFDM symbols, the first frequency domain resource includes two consecutive subcarriers, and the second The resource includes 8 REs, the second resource corresponds to the 2 OFDM symbols, and the second frequency domain resource includes 4 consecutive subcarriers.

In a possible manner, the elements included in any sequence in the first sequence set are in a one-to-one correspondence with the resource elements RE included in the first resource, and the elements included in any sequence in the second sequence set are in one-to-one correspondence. There is a one-to-one correspondence between elements and REs included in the second resource.

In a fourth aspect, a communication apparatus is provided, the apparatus may include a transceiver unit for receiving a first reference signal on a first resource and a second reference signal on a second resource; a processing unit for receiving a reference signal according to the reference signal Detecting a channel, wherein the first resource includes the first time domain resource in the time domain, includes the first frequency domain resource in the frequency domain, and the second resource includes the first time domain resource in the time domain resources, including the second frequency domain resource in the frequency domain, the first frequency domain resource is a part of the second frequency domain resource, or the first frequency domain resource and the second frequency domain resource The intersection is empty. .

A possible way, the reference signal sequence of the second reference signal

elements mapped on the kth subcarrier and the lth symbol

Satisfy the following relationship:

where k is an integer from 0 to K-1, and K is

A possible way, characterized in that the sequence included in the second sequence set is used as a matrix composed of row vectors

Satisfy the following relationship:

or,

or,

Satisfy the following relationship:

or,

It should be understood that the expansions, definitions, explanations and descriptions of the related content in the above-mentioned first aspect also apply to the same content in the second, third and fourth aspects.

In a fifth aspect, an apparatus is provided, including a processor. The processor is coupled to the memory and is operable to execute instructions in the memory to cause the apparatus to perform the first aspect or the second aspect, or any of the first aspects, or any of the second aspects, or the first aspect A method in all possible implementations in one aspect, or in all possible implementations in the second aspect. Optionally, the apparatus further includes a memory. Optionally, the apparatus further includes an interface circuit, and the processor is coupled to the interface circuit.

In a sixth aspect, a processor is provided, including: an input circuit, an output circuit, and a processing circuit. The processing circuit is configured to receive signals through the input circuit and transmit signals through the output circuit, causing the processor to perform the first aspect or, the second aspect, or any of the first aspects, or any of the second aspects methods in all possible implementations of the first aspect, or all possible implementations of the second aspect.

In a specific implementation process, the above-mentioned processor may be a chip, the input circuit may be an input pin, the output circuit may be an output pin, and the processing circuit may be a transistor, a gate circuit, a flip-flop, and various logic circuits. The input signal received by the input circuit may be received and input by, for example, but not limited to, a receiver, the signal output by the output circuit may be, for example, but not limited to, output to and transmitted by a transmitter, and the input circuit and output The circuit can be the same circuit that acts as an input circuit and an output circuit at different times. The embodiments of the present application do not limit the specific implementation manners of the processor and various circuits.

In a seventh aspect, a processing apparatus is provided, including a processor and a memory. The processor is configured to read instructions stored in the memory, and may receive signals through a receiver and transmit signals through a transmitter to perform the first aspect or the second aspect, or any one of the first aspects, or the second aspect A method in any one, or all of the first aspect, or all possible implementations of the second aspect.

The processing device in the above seventh aspect 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, or the like; when implemented by software, the processor may be a logic circuit or an integrated circuit. When implemented, the processor can be a general-purpose processor, which is realized by reading software codes stored in a memory, and the memory can be integrated in the processor or located outside the processor and exist independently.

In an eighth aspect, a computer program product is provided, the computer program product comprising: a computer program (also referred to as code, or instructions), when the computer program is executed, causes the computer to execute the above-mentioned first aspect or, the second Aspect, or any one of the first aspect, or any one of the second aspect, or all of the first aspect, or a method in all possible implementations of the second aspect.

In a ninth aspect, a computer-readable medium is provided, the computer-readable medium stores a computer program (also referred to as code, or instruction) when it runs on a computer, causing the computer to execute the above-mentioned first aspect or, the first The second aspect, or any one of the first aspect, or any one of the second aspect, or all of the first aspect, or a method in all possible implementations of the second aspect.

Description of drawings

FIG. 1 is a schematic diagram of a communication system provided by an embodiment of the present application.

Figure 2 is a pilot pattern for two configuration types in the current standard.

FIG. 3 , FIG. 5 , and FIG. 8 show several examples of DMRS patterns provided by the embodiments of the present application.

FIG. 4 , FIG. 6 , and FIG. 7 show several examples of sequence element mapping patterns provided by the embodiments of the present application.

FIG. 9 is a schematic flowchart of a solution for transmitting a reference signal provided by an embodiment of the present application.

FIG. 10 is a schematic flowchart of an interaction system applying a transmission reference signal scheme provided by an embodiment of the present application.

FIG. 11 is a schematic diagram of a communication apparatus provided by an embodiment of the present application.

FIG. 12 is a schematic diagram of a network device provided by an embodiment of the present application.

FIG. 13 is a schematic diagram of a terminal device provided by an embodiment of the present application.

Detailed ways

The technical solutions in the present application will be described below with reference to the accompanying drawings.

The wireless communication systems mentioned in the embodiments of this application include, but are not limited to: Global System of Mobile communication (GSM) system, Code Division Multiple Access (Code Division Multiple Access, CDMA) system, Wideband Code Division Multiple Access (Wideband Code Division Multiple Access, WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, Advanced Long Term Evolution (LTE-A) system, LTE Frequency Division Duplex (Frequency Division Duplex, FDD) system, LTE Time Division Duplex (TDD), Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication system, fifth generation ( fifth-generation, 5G) communication system, fusion system of multiple access systems, or evolution system, three major application scenarios of 5G mobile communication system eMBB, URLLC and eMTC or new communication systems that will appear in the future.

The network device involved in the embodiments of this application may be any device with a wireless transceiver function or a chip that can be provided in the device, and the device includes but is not limited to: an evolved Node B (evolved Node B, eNB), a wireless network Controller (Radio Network Controller, RNC), Node B (Node B, NB), Base Station Controller (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), access point (Access Point, AP), wireless relay node, wireless backhaul node, transmission in Wireless Fidelity (Wireless Fidelity, WIFI) system Point (transmission point, TP) or transmission and reception point (transmission and reception point, TRP) or remote radio head (remote radio head, RRH), etc., can also be 5G, such as NR, gNB in the system, or transmission point (TRP or TP), one or a group (including multiple antenna panels) antenna panels of a base station in a 5G system, or, it can also be a network node that constitutes a gNB or transmission point, such as a baseband unit (BBU), or, distributed type unit (distributed unit, DU) and so on.

In some deployments, a gNB may include a centralized unit (CU) and a DU. The gNB may also include an active antenna unit (active antenna unit, AAU for short). The CU implements some functions of the gNB, and the DU implements some functions of the gNB. For example, the CU is responsible for processing non-real-time protocols and services, and implementing functions of radio resource control (RRC) and packet data convergence protocol (PDCP) layers. The DU is responsible for processing physical layer protocols and real-time services, and implementing the functions of the radio link control (RLC) layer, the media access control (MAC) layer and the physical (PHY) layer. AAU implements some physical layer processing functions, radio frequency processing and related functions of active antennas. Since the information of the RRC layer will eventually become the information of the PHY layer, or be transformed from the information of the PHY layer, therefore, in this architecture, the higher-layer signaling, such as the RRC layer signaling, can also be considered to be sent by the DU. , or, sent by DU+AAU. It can be understood that the network device may be a device including one or more of a CU node, a DU node, and an AAU node. In addition, the CU can be divided into network devices in an access network (radio access network, RAN), and the CU can also be divided into network devices in a core network (core network, CN), which is not limited in this application.

For example, a network device can be used as a scheduling device. In this case, the network device may include, but is not limited to, an LTE base station eNB, an NR base station gNB, an operator, etc., and its functions may include, for example, configuring uplink and downlink resources, In the base station scheduling mode, downlink control information (DCI) is sent. Exemplarily, the network device can also be used as a sending device. In this case, the network device may include, but is not limited to, TRP and RRH, and its functions may include, for example, sending downlink signals and receiving uplink signals.

The terminal equipment involved in the embodiments of this application may also be referred to as user equipment (user equipment, UE), access terminal, subscriber unit, subscriber station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, Terminal, wireless communication device, user agent or user equipment. The terminal device in the embodiment of the present application may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with a wireless transceiver function, a wearable device, a virtual reality (virtual reality, VR) terminal device, an augmented reality (augmented reality) , AR) terminal equipment, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical, wireless terminals in smart grid , wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, and so on. The embodiments of the present application do not limit application scenarios. In this application, the aforementioned terminal equipment and the chips that can be provided in the aforementioned terminal equipment are collectively referred to as terminal equipment.

The functions of the terminal device may include, but are not limited to, for example, receiving downlink/sidelink signals, and/or sending uplink/sidelink signals.

This application takes the physical downlink control channel PDCCH as an example to describe the downlink control channel, takes the physical downlink shared channel PDSCH as an example to describe the downlink data channel, and takes the carrier as an example to describe the frequency domain unit , taking a time slot as an example to describe the time unit in the 5G system, the time slot involved in this application may also be a transmission time interval TTI and/or a time unit and/or a subframe and/or a mini-slot.

FIG. 1 is a schematic diagram of a communication system using the present application to transmit information. As shown in FIG. 1 , the communication system 100 includes a network device 102 , which may include a plurality of antennas, eg,

antennas

104 , 106 , 108 , 110 , 112 , and 114 . Additionally, the network device 102 may additionally include a transmitter chain and a receiver chain, each of which may include various components (eg, processors, modulators, multiplexers) related to signal transmission and reception, as will be understood by those of ordinary skill in the art. , demodulator, demultiplexer or antenna, etc.).

Network device 102 may communicate with a plurality of end devices (eg, end device 116 and end device 122). It will be appreciated, however, that network device 102 may communicate with any number of end devices similar to end

devices

116 or 122 .

Terminal devices

116 and 122 may be, for example, cellular telephones, smart phones, laptop computers, handheld communication devices, handheld computing devices, satellite radios, global positioning systems, PDAs, and/or any other suitable device for communicating over wireless communication system 100 . equipment.

As shown in FIG. 1 , end device 116 communicates with

antennas

112 and 114 that transmit information to end device 116 over forward link 118 and receive information from end device 116 over reverse link 120 . In addition, terminal device 122 communicates with

antennas

104 and 106 , which transmit information to terminal device 122 via forward link 124 and receive information from terminal device 122 via reverse link 126 .

For example, in a Frequency Division Duplex (FDD) system, for example, forward link 118 may use a different frequency band than reverse link 120, and forward link 124 may use a different frequency band than reverse link 126. frequency band.

For another example, in a Time Division Duplex (TDD) system and a Full Duplex (Full Duplex) system, the forward link 118 and the reverse link 120 may use a common frequency band, and the forward link 124 and the reverse link 120 may use a common frequency band. Links 126 may use a common frequency band.

Each antenna (or group of antennas) and/or area designed for communication is referred to as a sector of network device 102 . For example, an antenna group may be designed to communicate with terminal devices in sectors of the network device 102 coverage area. During communication of network device 102 with

terminal devices

116 and 122 over

forward links

118 and 124, respectively, the transmit antenna of network device 102 may utilize beamforming to improve the signal-to-noise ratio of

forward links

118 and 124. Furthermore, when the network device 102 uses beamforming to transmit to the

terminal devices

116 and 122 randomly dispersed in the associated coverage area, the Mobile devices will experience less interference.

At a given time, network device 102, end device 116, or end device 122 may be a wireless communication transmitter and/or a wireless communication receiver. When transmitting data, the wireless communication transmitting device may encode the data for transmission. Specifically, the wireless communication transmitting device may acquire (eg, generate, receive from other communication devices, or store in memory, etc.) a certain number of data bits to be transmitted over the channel to the wireless communication receiving device. Such data bits may be contained in a transport block (or transport blocks) of data, which may be segmented to produce multiple code blocks.

In addition, the communication system 100 may be a public land mobile network (full name in English may be: Public Land Mobile Network, abbreviation in English may be: PLMN) network or D2D network or M2M network or other network, FIG. 1 is only a simplified schematic diagram of an example, the network It may also include other network equipment, which is not shown in FIG. 1 .

It should be noted that, in this embodiment of the present application, the sending device may be the above-mentioned network device 102 or a terminal device (for example, the terminal device 116 or the terminal device 122 ), and correspondingly, the receiving end device may be the above-mentioned terminal device ( For example, the terminal device 116 or the terminal device 122) may also be the network device 102, which is not particularly limited in this application.

It can be understood that, the DMRS is used as an example to perform signal transmission in the embodiments of the present application, and other signal types applicable to the embodiments of the present application are all within the protection scope of the present application, which is not particularly limited in the present application.

To facilitate understanding of the embodiments of the present application, the following briefly introduces terms and backgrounds involved in the present application.

1. Antenna port

Antenna ports are referred to as ports for short. It can be understood as a transmitting antenna recognized by the receiving end, or a transmitting antenna that can be distinguished in space. One antenna port may be configured for each virtual antenna, and each virtual antenna may be a weighted combination of multiple physical antennas. According to different signals carried, the antenna ports can be divided into reference signal ports and data ports. The reference signal ports include, but are not limited to, demodulation reference signal (DMRS) ports, channel state information reference signal (CSI-RS) ports, and the like.

This application includes existing ports and new ports. Existing ports refer to ports in existing protocols or ports that support technical solutions in existing protocols; new ports refer to ports that can support the technical solutions of the present application. .

2. Time-frequency resources

In this embodiment of the present application, data or information may be carried through time-frequency resources, where the time-frequency resources may include resources in the time domain and resources in the frequency domain. Wherein, in the time domain, the time-frequency resources may include one or more time-domain units (or may also be referred to as time units, time units), and in the frequency domain, the time-frequency resources may include one or more frequency-domain units .

One time domain unit may be one symbol or several symbols (such as orthogonal frequency division multiplexing (OFDM) symbols), or a mini-slot (mini-slot), or a time slot (slot). ), or a subframe, where the duration of a subframe in the time domain may be 1 millisecond (ms), a slot consists of 7 or 14 symbols, and a mini slot may include at least one symbols (eg, 2 symbols or 7 symbols or 14 symbols, or any number of symbols less than or equal to 14 symbols). The above-mentioned time-domain unit size enumerated is only for the convenience of understanding the solution of the present application, and does not limit the protection scope of the embodiments of the present application. It can be understood that the above-mentioned time-domain unit size can be other values, which is not limited in this application.

A frequency domain unit can be a resource block (RB), or a subcarrier (subcarrier), or a resource block group (RBG), or a predefined subband (subband), or a A precoding resource block group (PRG), or a bandwidth part (BWP), or a resource element (RE) (or resource element), or a carrier, or a serving cell.

The transmission unit mentioned in the embodiments of this application may include any one of the following: a time-domain unit, a frequency-domain unit, or a time-frequency unit. For example, the transmission unit mentioned in the embodiments of this application may be replaced by a time-domain unit, It can also be replaced by a frequency domain unit, and can also be replaced by a time-frequency unit. For another example, the transmission unit may also be replaced by a transmission opportunity. The time domain unit may include one or more OFDM symbols, or the time domain unit may include one or more slots, and so on. The frequency domain unit may include one or more RBs, or the frequency domain unit may include one or more subcarriers, and so on.

3. Space layer

For a spatial multiplexing MIMO system, multiple parallel data streams can be simultaneously transmitted on the same time-frequency resource, and each data stream is called a spatial layer or spatial stream.

4. Demodulation Reference Signal (DMRS)

The DMRS is used to estimate the equivalent channel matrix experienced by a data channel (eg PDSCH) or control channel (eg PDCCH) for detection and demodulation of data. Taking the data channel PDSCH as an example, the DMRS usually performs the same precoding as the transmitted data signal, so as to ensure that the DMRS and the data experience the same equivalent channel. Assuming that the DMRS vector sent by the sender is s, the data symbol vector sent by the sender is x, and the DMRS and data are subjected to the same precoding operation (multiplied by the same precoding matrix P), the corresponding received signal vector at the receiver can be expressed as

data:

DMRS:

For both the data signal and the reference signal, the experienced equivalent channels are

Based on the known DMRS vector s, the receiver can use channel estimation algorithms (such as least squares LS channel estimation, minimum mean square error MMSE channel estimation, etc.) to obtain the equivalent channel.

's estimate. MIMO equalization and subsequent demodulation of the data signal can be accomplished based on the equivalent channel.

Since DMRS is used to estimate the equivalent channel

Its dimension is _NR ×R, where _NR is the number of receiving antennas, and R is the number of transport streams (rank). Generally speaking, one DMRS port corresponds to one spatial layer. For MIMO transmission with R number of transmission streams, the required number of DMRS ports is R. In order to ensure the quality of channel estimation, usually different DMRS ports are orthogonal ports. The DMRS symbols corresponding to different DMRS ports are orthogonal in the frequency domain, time-frequency or code domain. Currently, 5G NR supports two types of DMRS resource mapping. For Type 1 (Type 1) DMRS, a maximum of 8 orthogonal ports can be supported; for a Type 2 (Type 2) DMRS, a maximum of 12 orthogonal ports can be supported. Therefore, currently, NR can only support MIMO transmission of up to 12 streams.

DMRS is an important reference signal for detection by the receiver. The DMRS is sent along with the transmitted data channel (PDSCH). The NR DMRS ports are orthogonal DMRS ports, that is, the DMRS symbols corresponding to different DMRS ports are frequency division multiplexed and/or code division multiplexed. For a DMRS port, in order to perform channel estimation on different time-frequency resources and ensure the quality of channel estimation, it is necessary to send multiple DMRS symbols in multiple time-frequency resources.

Hereinafter, with reference to FIG. 9 , the method for sending and receiving a DMRS according to an embodiment of the present application will be described in detail.

It should be noted that, in this embodiment of the present application, the sending device (for example, the first sending device) may be a network device (for example, an access network device) or a terminal device, which is not particularly limited in this application. When it is a network device, it can perform the actions performed by the network device in the following description; when the sending device is a terminal device, it can perform the actions performed by the terminal device in the following description.

Similarly, the receiving device (for example, the first receiving device) may be a network device (for example, an access network device) or a terminal device, which is not particularly limited in this application. When the receiving device is a network device, the following description can be performed The actions performed by the network device in the description below; when the receiving device is a terminal device, the actions performed by the terminal device in the following description can be performed.

FIG. 9 shows a schematic interaction diagram of a method 200 for transceiving a reference signal according to an embodiment of the present application. As shown in FIG. 9 , at S210, the transmission device #A (ie, an example of the first transmission device) generates DMRS #A (ie, an example of the first DMRS). Wherein, the process of generating the DMRS#A may be similar to that in the prior art, and the detailed description thereof is omitted here in order to avoid redundant description.

It should be understood that the steps shown in FIG. 9 are taken as an example and not a limitation.

It should be noted that, in this embodiment of the present application, the DMRS #A is a DMRS of type #A (ie, an example of the first type).

Afterwards, the transmitting device #A can determine the antenna port of the DMRS #A, which is hereinafter denoted as: antenna port #A for ease of understanding and distinction. It should be noted that the antenna port #A is only used to correspond to the DMRS #A, and does not limit the number of antenna ports, that is, the antenna port #A may represent one or more antenna ports.

As an example but not a limitation, in this embodiment of the present application, the antenna port of the DMRS may be determined by the network device and delivered to the terminal device by means of RRC signaling, MAC signaling, or physical layer signaling (such as DCI signaling, etc.). of. Therefore, when the sending device #A is a network device, the sending device #A can determine the antenna port #A by itself; when the sending device #A is a terminal device, the sending device #A can indicates that the antenna port #A is determined.

It should be noted that the antenna port #A is an antenna port that can be supported by the sending device #A, including existing ports and newly added ports. For the newly added port, the UE may report the capability of supporting the newly added port, and the network device may allocate the port to the UE based on the reported capability.

The antenna port of the first DMRS is determined from all antenna ports supported by the transmitting device.

In this embodiment of the present application, the sending device can support multiple antenna ports, and specifically, can support sending signals (for example, DMRS) through each antenna port of the multiple antenna ports.

In the prior art, each type of DMRS can only be transmitted through the antenna port corresponding to this type of DMRS. The antenna port of the DMRS may correspond to the antenna port index, and the antenna port corresponding to the DMRS may be 0, 1, 2, ..., 11, or may be 1000, 1001, 1002, ..., 1011. Or the index of the antenna port corresponding to the DMRS may be 0, 1, 2, ..., 11, or the index of the antenna port corresponding to the DMRS may be 1000, 1001, 1002, ..., 1011.

In contrast, in this embodiment of the present application, each type of DMRS can be sent through any one of all antenna ports supported by the sending device.

That is, in this embodiment of the present application, the antenna ports in the configuration pattern may not be bound with the type of DMRS, or in other words, each type of DMRS may be sent through any antenna port in the configuration pattern.

It should be understood that the configuration pattern may be a formula, a table or a diagram representing a rule for mapping sequence elements and time-frequency resources, which is not limited in this application. It should also be understood that the configuration pattern may be indicated by the network device, or may be predefined, which is not limited in this application.

As an example and not a limitation, for example, assuming that the configuration pattern can include time-frequency resources corresponding to each of the 8 antenna ports with antenna port indices a to h, the transmitting device #A can support all antenna ports in the configuration pattern. The transmitting device #A may transmit DMRS #A using antenna ports a and b in one time period and transmit DMRS #A using antenna ports e and f in another time period.

Further, if sending device #A is a network device, sending device #A can notify the antenna port index and/or the number of antenna ports used by DMRS #A through RRC signaling, MAC signaling, or physical layer signaling. receiving device.

If sending device #A is a terminal device, sending device #A may determine the antenna port index and/or the number of antenna ports used by DMRS#A by receiving RRC signaling, MAC signaling, or physical layer signaling, etc., where DMRS The antenna port index and/or the number of antenna ports used by #A are determined by the network device and notified to the terminal device. It should be noted that the terminal device needs to report the maximum number of antenna ports or the maximum number of layers that the device can support to the network device in advance, so that the network device can determine the number of antenna ports or the number of antenna ports that the terminal device can support.

And, in S210, the receiving device of the DMRS #A (that is, an example of the first receiving device, hereinafter, for ease of understanding and description, referred to as: receiving device #A) can determine the antenna port #A, and receive The process by which device #A determines the antenna port #A may be similar to the process by which the transmitting device #A determines the antenna port #A, that is, when the receiving device #A is a network device, the receiving device #A can determine the antenna port # by itself. A; When the receiving device #A is a terminal device, the receiving device #A can determine the antenna port #A according to the indication of the network device to which it is connected.

In S220, the sending device #A may search for a configuration pattern based on the antenna port #A, so as to determine the time-frequency resource corresponding to the antenna port #A (ie, an example of the first time-frequency resource, hereinafter, for ease of understanding and description) , denoted as: time-frequency resource #A), map DMRS #A to time-frequency resource #A, and send the DMRS #A through antenna port #A.

It should be noted that, as described above, the system time-frequency resources (or, in other words, the time-frequency resources included in the configuration pattern) can be divided into multiple basic time-frequency resource units (for example, one or more RBs or one or more RE), the time-frequency resource #A may be located on all basic time-frequency resource units in the system time-frequency resource, or may be located on some basic time-frequency resource units in the system time-frequency resource, for example, the time-frequency resource #A It is located on one RB or multiple RBs in the system time-frequency resource, which is not particularly limited in this application.

In addition, in this embodiment of the present application, in addition to the DMRS #A, all or part of the time-frequency resources (for example, all or part of the REs) that exist in the time-frequency resource #A also carry one or more other DMRSs ( For example, the following DMRS#B and/or DMRS#C), hereinafter, in order to facilitate understanding and distinction, some or all of the time-frequency resources that bear at least two types of DMRS on time-frequency resource #A are denoted as: time-frequency Resource #A1.

In this case, the DMRS #A and the other one or more DMRSs may use, for example, code division multiplexing to multiplex the time-frequency resource #A1.

Therefore, in this embodiment of the present application, the sending device #A can determine the code resource corresponding to the DMRS #A (for example, the CDM code, hereinafter, for ease of understanding and distinction, denoted as: code resource #A). Wherein, "code resource corresponding to DMRS#A" can be understood as DMRS#A is multiplexed on time-frequency resource #A1 based on the code resource #A.

As an example and not a limitation, in this embodiment of the present application, the maximum number of DMRS ports multiplexed on the same time-frequency resource may be determined based on the length of the code resource. For example, if the length of the code resource is 4, the maximum number of DMRS ports can be determined. 4 DMRSs are supported to be multiplexed in the same time-frequency resource. If the length of the code resource is 8, 8 DMRSs can be supported to be multiplexed in the same time-frequency resource.

In addition, in this embodiment of the present application, the code resource corresponding to each DMRS may be determined by a network device (which can be used as a DMRS sending device or a receiving device) and notified to a terminal device (which can be used as a DMRS sending device or receiving device). Alternatively, the code resource corresponding to each DMRS may be preset, and the code resource corresponding to each DMRS corresponds to the DMRS port index.

For another example, in this embodiment of the present application, the code resource corresponding to each type of DMRS may be specified by a communication system or a communication protocol, so that the type of DMRS actually sent and or the port index corresponding to the actually sent DMRS can be determined. Code resource corresponding to DMRS.

It should be understood that the methods for determining code resources listed above are only exemplary descriptions, and the present application is not limited thereto. The method for determining code resources in the embodiments of the present application may also be similar to the prior art. its detailed description.

The code resource #A is orthogonal to code resources (eg, CDM codes) corresponding to other DMRSs (eg, DMRS #B and/or DMRS #C described later) carried on time-frequency resource #A1. Therefore, the sending device #A can also multiplex the DMRS #A on the time-frequency resource #A1 based on the code resource #A.

And, in S220, the receiving device #A may search for a configuration pattern based on the antenna port #A, thereby determining the time-frequency resource #A corresponding to the antenna port #A, and receive the DMRS #A through the time-frequency resource #A , and the process of determining the time-frequency resource #A by the receiving device #A may be similar to the process of determining the time-frequency resource #A by the transmitting device #A, and the detailed description thereof is omitted here to avoid redundant description.

In addition, the receiving device #A can also determine the code resource #A, and obtain the DMRS #A from the time-frequency resource #A1 based on the code resource #A, and the process of determining the code resource #A by the receiving device #A can be the same as that of the sending device #A. A process for determining the code resource #A is similar, and the detailed description thereof is omitted here in order to avoid redundant description.

It should be noted that, if code resource #A is used on time-frequency resource #A1, the same code resource #A can also be used on other time-frequency resources except time-frequency resource #A1 in time-frequency resource #A.

It should be understood that the sequences in this application may be used for DMRS, and may also be used for other reference signals, such as CSI-RS, CRS, SRS, etc., which are not limited in this application.

The DMRS may occupy at least one OFDM symbol in the time domain, and the bandwidth occupied in the frequency domain is the same as the scheduling bandwidth of the scheduled data signal. Multiple DMRS symbols corresponding to one port correspond to one DMRS base sequence, and one DMRS base sequence includes multiple DMRS base sequence elements. Taking the DMRS base sequence corresponding to the existing port as an example, the nth element in the DMRS base sequence can be generated by the following formula:

The DMRS base sequence r(n) generated based on the gold sequence can satisfy the following formula:

Among them, c(n) is a pseudo-random sequence, and the generation formula is:

Among them, N _C =1600, x ₁ (n) can be initialized as x ₁ (0)=1, x ₁ (n)=0, n=1,2,...,30, x ₂ (n) initialization Satisfy:

ci _n i _t is defined in the following form:

where l is an orthogonal frequency division multiplexing (OFDM) symbol index in a time slot,

is the slot index within a system frame,

is the number of OFDM symbols in a time slot, N _ID ⁰ , N _ID ¹ ∈ {0, 1, 2, 3, 4, 5, 6...}, the values are all integers, and can be configured by high-layer signaling.

It is related to the cell ID (identification), which can usually be equal to the cell ID.

For initialization parameters, the value can be 0 or 1. λ represents the code division multiplexing (CDM) group index corresponding to the DMRS port.

In this embodiment of the present application, an OFDM symbol may also be referred to as a symbol for short. If there is no special description, the symbol hereinafter refers to an OFDM symbol.

The DMRS base sequence corresponding to one port is multiplied by the corresponding mask sequence and then mapped to the corresponding time-frequency resource through a preset time-frequency resource mapping rule. In the current NR protocol, two types of DMRS configuration methods are defined, including Type 1 DMRS and Type 2 DMRS.

For example, for an existing port p, the m-th element r(m) in the corresponding DMRS base sequence is mapped to a resource element (RE) with an index of (k, l) _{p, μ} according to the following rules. Among them, the RE with index (k, l) _{p, μ} corresponds to the OFDM symbol with index l in one slot in the time domain, and corresponds to the subcarrier with index k in the frequency domain, and the mapping rules satisfy:

p is the index of the DMRS port,

is the symbol index of the starting OFDM symbol occupied by the DMRS modulation symbol or the symbol index of the reference OFDM symbol, w _f (k') is the frequency domain mask sequence element corresponding to the subcarrier with index k', w _t (l') is the time-domain mask sequence element corresponding to the OFDM symbol with index l'. μ represents the subcarrier spacing parameter,

is the power scaling factor, m=2n+k', and Δ is the subcarrier offset factor.

In this application, the reference signal sequence corresponding to the newly added port is

elements mapped on the kth subcarrier and the lth symbol

Satisfy the following relationship:

where k is an integer from 0 to K-1, and K is

The total number of subcarriers occupied in the frequency domain, l is 0 or 1, β is a non-zero complex number, the number of elements included in the mask sequence w is I, and i satisfies i=k mod(I/2)+l· (I/2) or i=(k mod(I/2))·2+l,r(k,l) is the element of the base sequence r mapped on the kth subcarrier and the lth symbol, the base sequence r The production method of can be as shown in formula (1). c(t) is a block sequence, and t satisfies t=floor(k/(I/2)).

Among them, A mod B represents the modulo operation, which is used to represent the remainder obtained by dividing A by B. It can also be recorded as A%B or mod(A,B), and floor(A) represents the rounding operation of A, which is used for Represents the largest integer not greater than A.

Among them, each element in the block sequence corresponds to a sequence block composed of a mask sequence with a length of 1. As shown in equation (5), there are 1 time-frequency resources corresponding to consecutive 1/2 subcarriers and 2 OFDM symbols. Particles each correspond to an element in the block sequence. Or the I elements contained in the mask sequence w(i) all correspond to one element in the block sequence. For different sequence blocks, corresponding to different elements in the block sequence. In this way, the cross-correlation between long sequences composed of multiple sequence blocks can be guaranteed to be low, thereby reducing interference.

In the configuration type 1 (Type 1 DMRS) mapping rule, the values of w _f (k'), _wt (l') and Δ corresponding to the existing DMRS port p may be determined according to Table 1.

Table 1 Type 1 DMRS parameter values

It should be understood that Table 1 is only used for illustration, not limitation.

In the configuration type 2 (Type 2 DMRS) mapping rule, the values of w _f (k'), _wt (l') and Δ corresponding to the existing DMRS port p can be determined according to Table 2.

Table 2 Type 2 DMRS parameter values

It should be understood that Table 2 is only used for illustration, not limitation.

Among them, λ is the index of the code division multiplexing group (CDM group) to which the existing port p belongs, and the time-frequency resources occupied by the DMRS ports in the same CDM group are the same.

According to formula (4), the time-frequency resource mapping mode of Type1 DMRS is shown in (a) of FIG. 2 .

For a single-symbol DMRS (corresponding to 1'=0), a maximum of 4 ports are supported, and the DMRS resource occupies one OFDM symbol. The 4 DMRS ports are divided into 2 code division multiplexing groups, where CDM group 0 includes port 0 and port 1; CDM group 1 includes port 2 and port 3. CDM group 0 and CDM group 1 are frequency division multiplexed (mapped on different frequency domain resources). The DMRS ports included in the CDM group are mapped on the same time-frequency resources. The reference signal sequences corresponding to the DMRS ports included in the CDM group are distinguished by the mask sequence, thereby ensuring the orthogonality of the DMRS ports in the CDM group, thereby suppressing the interference between the DMRSs transmitted on different antenna ports.

Specifically, port 0 and port 1 are located in the same resource element (RE), and resource mapping is performed in a comb-tooth manner in the frequency domain. That is, the adjacent frequency domain resources occupied by port 0 and port 1 are separated by one subcarrier. For a DMRS port, the occupied adjacent two REs correspond to a mask sequence of length 2. For example, for subcarrier 0 and subcarrier 2, port 0 and port 1 use a set of mask sequences of length 2 (+1+1 and +1-1). Similarly, port 2 and port 3 are located in the same RE, and are mapped on the REs not occupied by port 0 and port 1 in a comb-tooth manner in the frequency domain. For subcarrier 1 and subcarrier 3, port 2 and port 3 use a set of mask sequences of length 2 (+1+1 and +1-1).

It should be understood that p in the table of this application is the port index, the port whose port index is 1000 can be port 0 or port 0, the port whose port index is 1001 can be port 1 or port 1, ..., the port whose port index is 100X Can be port X or port X.

For dual-symbol DMRS (corresponding to l'=0 or 1), a maximum of 8 ports are supported, and the DMRS resource occupies two OFDM symbols. The 8 DMRS ports are divided into 2 CDM groups. CDM group 0 includes port 0, port 1, port 4, and port 5; CDM group 1 includes port 2, port 3, port 6, and port 7. CDM group 0 and CDM group 1 are frequency division multiplexed. The DMRS ports included in the CDM group are mapped on the same time-frequency resources. The reference signal sequences corresponding to the DMRS ports included in the CDM group are distinguished by mask sequences.

Specifically, port 0, port 1, port 4, and port 5 are located in the same RE, and resource mapping is performed in the frequency domain in a comb-tooth manner, that is, adjacent frequencies occupied by port 0, port 1, port 4, and port 5 are The domain resources are spaced by one subcarrier. For one DMRS port, the occupied adjacent 2 subcarriers and 2 OFDM symbols correspond to a mask sequence with a length of 4. For example, for subcarrier 0 and subcarrier 2 corresponding to OFDM symbol 0 and OFDM symbol 1, port 0, port 1, port 4 and port 5 use a set of mask sequences of length 4 (+1+1+1+1/ +1+1-1-1/+1-1+1-1/+1-1-1+1). Similarly, port 2, port 3, port 6 and port 7 are located in the same RE, and are mapped on the unoccupied subcarriers of port 0, port 1, port 4 and port 5 in a comb-tooth manner in the frequency domain. For subcarrier 1 and subcarrier 3 corresponding to OFDM symbol 0 and OFDM symbol 1, port 2, port 3, port 6 and port 7 use a set of mask sequences of length 4 (+1+1+1+1/+1 +1-1-1/+1-1+1-1/+1-1-1+1).

For Type 2 DMRS, the time-frequency resource mapping method is shown in (b) in Figure 2.

For single-symbol DMRS, a maximum of 6 ports are supported, and the DMRS resource occupies one OFDM symbol. The 6 DMRS ports are divided into 3 CDM groups. CDM group 0 includes port 0 and port 1; CDM group 1 includes port 2 and port 3; CDM group 2 includes port 4 and port 5. Frequency division multiplexing is used between CDM groups, and the DMRS corresponding to the DMRS ports included in the CDM group are mapped on the same time-frequency resources. The reference signal sequences corresponding to the DMRS ports included in the CDM group are distinguished by mask sequences. For one DMRS port, its corresponding DMRS reference signal is mapped in a plurality of resource sub-blocks including two consecutive sub-carriers in the frequency domain, and the adjacent resource sub-blocks are separated by 4 sub-carriers in the frequency domain.

Specifically, port 0 and port 1 are located in the same RE, and resource mapping is performed in a comb-tooth manner in the frequency domain. Taking the frequency domain resource granularity of 1RB as an example, port 0 and port 1 occupy subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7. Port 2 and port 3 occupy sub-carrier 2, sub-carrier 3, sub-carrier 8 and sub-carrier 9. Port 4 and port 5 occupy sub-carrier 4, sub-carrier 5, sub-carrier 10 and sub-carrier 11. For two DMRS ports included in one CDM group, they correspond to a mask sequence of length 2 (+1+1 and +1-1) in two adjacent subcarriers.

For dual-symbol DMRS, a maximum of 12 ports are supported, and DMRS resources occupy two OFDM symbols. The 12 DMRS ports are divided into 3 CDM groups, of which CDM group 0 includes port 0, port 1, port 6 and port 7; CDM group 1 includes port 2, port 3, port 8 and port 9; CDM group 2 includes port 4 , port 5, port 10, and port 11. Frequency division multiplexing is used between CDM groups, and the DMRS corresponding to the DMRS ports included in the CDM group are mapped on the same time-frequency resources. The reference signal sequences corresponding to the DMRS ports included in the CDM group are distinguished by mask sequences. For one DMRS port, its corresponding DMRS reference signal is mapped in a plurality of resource sub-blocks including two consecutive sub-carriers in the frequency domain, and the adjacent resource sub-blocks are separated by 4 sub-carriers in the frequency domain.

Specifically, port 0, port 1, port 6, and port 7 are located in the same RE, and resource mapping is performed in a comb-tooth manner in the frequency domain. Taking the frequency domain resource granularity of 1RB as an example, port 0, port 1, port 6, and port 7 occupy subcarrier 0, subcarrier 1, subcarrier 6, and subcarrier 7 corresponding to OFDM symbol 0 and OFDM symbol 1. port 2, port 3, port 8, and port 9 occupy subcarrier 2, subcarrier 3, subcarrier 8, and subcarrier 9 corresponding to OFDM symbol 1 and OFDM symbol 2. port 4, port 5, port 10, and port 11 occupy subcarrier 4, subcarrier 5, subcarrier 10, and subcarrier 11 corresponding to OFDM symbol 1 and OFDM symbol 2. For the 4 DMRS ports included in a CDM group, it corresponds to a mask sequence of length 4 (+1+1+1+1/+1+1- 1-1/+1-1+1-1/+1-1-1+1).

The DMRS transmission method according to the embodiment of the present application is described in detail below with reference to the accompanying drawings.

It should be understood that the mask sequence is used as an example in this embodiment of the present application as an encoding to characterize the orthogonality of transmission data, and other applicable encodings are also within the protection scope of the present application, which is not limited in the present application.

In an embodiment of the present application, the transmitting end device transmits the reference signal of the existing port (that is, the first reference signal) and the reference signal of the newly added port (that is, the second reference signal) on the same resource, and the receiving end device is in the The reference signal of the existing port and the reference signal of the newly added port are received on the same block of resources, and channel estimation is performed according to the reference signal sequence corresponding to each reference signal.

For example, for Type 2 DMRS, 12 DMRS ports are divided into 3 CDM groups. For each DMRS port, the basic frequency domain granularity of its time-frequency resource mapping is 6 consecutive subcarriers. The 6 consecutive subcarriers and 2 OFDM symbols are divided into 3 time-frequency resource subblocks, and each time-frequency resource subblock includes 2 consecutive subcarriers and 2 OFDM symbols. The three time-frequency resource sub-blocks are frequency-division multiplexed. As shown in FIG. 3 , the reference signal sequences corresponding to the four DMRS ports included in each CDM group are multiplied by a mask sequence with a length of 4 and then mapped onto all REs included in the same resource sub-block. For example, for DMRS port 1, in the time-frequency resource block composed of 12 REs shown in Figure 3, 4 REs corresponding to 2 consecutive subcarriers and 2 OFDM symbols are occupied, and the corresponding mask sequence of length 4 is + 1, -1, +1, -1.

In order to reuse the same time-frequency resources for more DMRS ports, the present application designs a set of mask sequences with a length of 12, wherein one mask sequence set includes 12 mask sequences. Each mask sequence contains 12 elements. Each mask sequence corresponds to a new DMRS port, so at least 12 new DMRS ports can be added.

In one implementation, the set of mask sequences may contain 12 mask sequences, and each mask sequence may contain 12 elements. Represent a mask sequence as a row vector, a matrix of 12 mask sequences in the form of row vectors

The following relationship can be satisfied:

in

or,

or,

here

represents the Kronecker product, B is a 12*12 matrix, where each row vector w _k = [w _k(0) w _k(1) ... w _k(11) ](k=1, 2, ......., N, which is a positive integer) corresponds to a mask sequence with a length of 12, and the length indicates the number of elements of the mask sequence. The matrix B corresponds to the set of mask sequences, wherein the 12 mask sequences included in the set of mask sequences correspond to the 12 row vectors in the matrix B one-to-one. Any two mask sequences contained in the mask sequence set B are orthogonal. The DMRS mask sequences of length 12 generated according to formula (6.A), formula (6.B) and formula (6.C) are shown in Table 3, Table 4 and Table 5, respectively.

It should be understood that the tables in this application are only used as examples rather than limitations. For example, the correspondence between indexes and elements in the table may also be other correspondences, and the correspondence between the sequence index in the table and the row vector corresponding to a row in the table. The relationship may also be other correspondence, the correspondence between the sequence index and the mask sequence in the table may also be other correspondence, the elements listed in the table may be part, may be all, and so on.

Table 3 Mask sequence of length 12 (based on Equation 6.A)

As shown in Table 3, the mask sequence can include

Table 4 Mask sequence of length 12 (based on Equation 6.B)

As shown in Table 4, the mask sequence can include

Table 5 Mask sequence of length 12 (based on Equation 6.C)

As shown in Table 5, the mask sequence can include {1,j,1,j,1,j,1,j,1,j,1,j},

{1,-j,1,-j,1,-j,1,-j,1,-j,1,-j},

{1,j,1,j,1,j,-1,-j,-1,-j,-1,-j},

{1,-j,1,-j,1,-j,-1,j,-1,j,-1,j},

In the new mask sequences with a length of 12 shown in Table 3, Table 4 or Table 5, each mask sequence corresponds to a DMRS port, so a total of 12 DMRS ports are added (hereinafter referred to as new ports) . One element included in each sequence corresponds to one RE included in the time-frequency resource block shown in FIG. 4 .

Specifically, a DMRS port corresponds to a mask sequence with a length of 12 in Table 3, Table 4 or Table 5, and the corresponding rules of the mask sequence element index and the time-frequency resource RE are shown in FIG. 4 . A mask sequence contains 12 elements, corresponding to the mask sequence element indices 0-11. The numbers marked in each RE in Figure 4 represent the indices of the mask sequence elements. The mask sequence elements corresponding to the mask sequence element indices 0 to 5 in Table 3, Table 4 or Table 5 correspond to the 6 subcarriers of the first OFDM symbol respectively; the mask sequence element indices 6 to 11 in Table 3 and Table 4 The corresponding mask sequence elements respectively correspond to the 6 subcarriers of the second OFDM symbol.

It should be understood that FIG. 4 is only an example and not a limitation, and FIG. 4 may be a diagram of a part of REs or all REs, that is, subcarriers 0 to 5 in the figure may represent any set of resource blocks, and symbols 0 to 1 may also be are other two consecutive OFDM symbols, which are not limited in this application. For example, sub-carriers 0-5 may be sub-carriers with indices 6q+0-6q+5, where q=0, 1, 2 . . .

Combined with the existing NR Type 2 DMRS port time-frequency resource mapping rules shown in Figure 3, the multiplexing relationship between the newly added DMRS port and the existing NR Type 2 DMRS port in the time-frequency resource blocks of the above 12 REs is shown in Figure 5 shown. The existing 12 ports of NR Type 2 DMRS are mapped according to the existing protocol time-frequency resource mapping method. One DMRS port corresponds to a mask sequence of length 4, which is mapped on two consecutive subcarriers. For the newly added 12 DMRS ports, the corresponding port indices 12 to 23 are multiplexed on all 12 REs using different 12-long mask sequences.

Taking DMRS port 0 and DMRS port 12 as an example, DMRS port 0 uses a mask sequence of length 4, which is mapped on subcarrier 0 and subcarrier 1 corresponding to two OFDM symbols. The DMRS port 12 adopts a mask sequence with a length of 12, which is mapped on subcarriers 0 to 5 corresponding to two OFDM symbols. For example, taking FIG. 4 as an example, the first element in the sequence corresponds to the RE with index 0, the second element corresponds to the RE with index 1, the third element corresponds to the RE with index 2, and so on.

In the new mask sequences of length 12 shown in Table 3, Table 4 or Table 5, any two mask sequences are orthogonal, that is, the 12-length mask sequences corresponding to any two ports in the newly added ports are Orthogonal. In addition, the mask sequence corresponding to any one of the existing Type 2 DMRS ports is pairwise orthogonal to the six mask sequences in the new 12 mask sequences shown in Table 3, Table 4 or Table 5 , and the cross-correlation coefficient with any one of the remaining 6 mask sequences is

Specifically, the existing NR Type 2 DMRS ports are arranged in the time-frequency resource block composed of the above 12 REs according to the mask sequence element index and the time-frequency resource correspondence rule shown in FIG. 4 , and the existing NR Type 2 DMRS ports correspond to The mask sequence of can be expressed as:

Table 6 Existing NR Type 2 DMRS mask sequences

For example, for the existing NR Type 2 DMRS port 0, according to the rule shown in Figure 4, the corresponding DMRS mask sequence length extended to 12 can be expressed as {+1 +1 0 0 0 0 +1 +1 0 0 0 0} . This sequence is orthogonal to the new mask sequence whose sequence index is 6 to 11 in Table 3, Table 4 or Table 5, and is orthogonal to the new mask sequence whose sequence index is 0 to 5 in Table 3, Table 4 or Table 5. The correlation coefficient is

Taking the new mask sequence whose sequence index is 0 in Table 3 as an example, its cross-correlation coefficient with the DMRS mask sequence corresponding to the existing NR Type 2 DMRS port 0 is:

It should be understood that the threshold value of the cross-correlation coefficient here may be

Therefore, for the mask sequences corresponding to the newly designed DMRS ports, half of the sequences are orthogonal to the mask sequences corresponding to the existing DMRS ports, and the other half of the mask sequences corresponding to the existing DMRS ports maintain low cross-correlation properties. , so that the quality of the channel estimation can be guaranteed to the greatest extent.

Taking Figure 4 as an example, the m-th element r(m) in the DMRS base sequence corresponding to port p in the newly added 12 DMRS ports is mapped to the RE with index (k,l) _p,μ according to the following rules . Among them, the RE with index (k, l) _{p, μ} corresponds to the OFDM symbol with index l in one slot in the time domain, and corresponds to the subcarrier with index k in the frequency domain, and the mapping rules satisfy:

p is the index of the DMRS port,

is the symbol index of the starting OFDM symbol occupied by the DMRS modulation symbol or the symbol index of the reference OFDM symbol, w _f (k') is the frequency domain mask sequence element corresponding to the subcarrier with index k', w _t (l') is the time-domain mask sequence element corresponding to the OFDM symbol with index l', and c(n) is the element of the block sequence mapped on the kth subcarrier and the lth symbol. μ represents the subcarrier spacing parameter,

is the power scaling factor, m=2n+k'.

Corresponding to the mask sequence shown in Table 3, the values of w _f (k') and _wt (l') corresponding to the DMRS port p can be determined according to Table 7.

Table 7 The new design length is 12 mask sequences corresponding to the mapping rules (corresponding to Table 3)

Corresponding to the mask sequence shown in Table 4, the values of w _f (k') and _wt (l') corresponding to the DMRS port p can be determined according to Table 8.

Table 8 The new design length is 12 mask sequences corresponding to the mapping rules (corresponding to Table 4)

Corresponding to the mask sequence shown in Table 5, the values of w _f (k') and _wt (l') corresponding to the DMRS port p can be determined according to Table 9.

Table 9 The new design length is 12 mask sequences corresponding to the mapping rules (corresponding to Table 5)

The value of the block sequence element c(n) can satisfy the following relationship:

Wherein, N is twice the number of RBs included in the bandwidth occupied by the DMRS signal in the frequency domain, and v may be a number relatively prime to N.

The embodiment of the present application expands the port of NR Type 2 DMRS. In the same time-frequency resource block, the existing NR Type 2 DMRS port and the newly added DMRS port respectively use a mask sequence with a length of 4 and a mask sequence with a length of 12. mask sequence. By design, any two sequences of the 12 mask sequences of length 12 are orthogonal. Any one of the mask sequences of length 4 is orthogonal to one half of the set of mask sequences of length 12, and guarantees low cross-correlation with the remaining half of the sequences. Therefore, the capacity of the DMRS port can be doubled without increasing the time-frequency resources, and the interference between the original port and the newly added port of the protocol can be minimized, and the quality of the channel estimation can be guaranteed.

In another implementation manner, a set of mask sequences with a length of 12 is designed, and the mask sequences contained in the set of mask sequences are matrices in the form of row vectors

The following relationship can be satisfied:

or,

here

represents the Kronecker product, B is a 12*12 matrix, where each row vector w _k = [w _k(0) w _k(1) ... w _k(11) ](k=1, 2,...,N, which is a positive integer) corresponds to a mask sequence of length 12. Any two mask sequences contained in the mask sequence set B are orthogonal. The DMRS mask sequences of length 12 generated according to Equation (9.A) and Equation (9.B) are shown in Table 10 and Table 11, respectively.

Table 10 Mask sequence of length 12 (based on Equation 9.A)

As shown in Table 10, the mask sequence can include:

Table 11 Mask sequence of length 12 (based on Equation 9.B)

As shown in Table 11, the mask sequence can include:

It should be understood that, in each embodiment of the present application, j in the table is an imaginary unit, and j ² =-1.

In the new mask sequences of length 12 shown in Table 10 or Table 11, each mask sequence corresponds to one DMRS port, so a total of 12 DMRS ports are added (hereinafter referred to as newly added ports). One element included in each sequence corresponds to one RE included in the time-frequency resource block shown in FIG. 4 .

Specifically, for a DMRS port, corresponding to a mask sequence with a length of 12 in Table 10 or Table 11, the corresponding rules of the mask sequence element index and the time-frequency resource RE are shown in FIG. 6 . A mask sequence contains 12 elements, corresponding to the indices of the mask sequence elements from 0 to 11. The numbers marked in each RE in Figure 6 represent the indices of the mask sequence elements. The mask sequence elements corresponding to the mask

sequence element indices

0, 2, 4, 6, 8, and 10 in Table 10 or Table 11 correspond to

subcarriers

0, 1, 2, 3, 4, and 5 of the first OFDM symbol, respectively. ; Mask sequence elements corresponding to mask

sequence element indices

1, 3, 5, 7, 9, and 11 in Table 10 or Table 11 correspond to

subcarriers

0, 1, 2, 3, 4, and 5 of the second OFDM symbol, respectively .

Taking DMRS port 0 and DMRS port 12 as an example, DMRS port 0 uses a mask sequence of length 4, which is mapped on subcarrier 0 and subcarrier 1 corresponding to two OFDM symbols. The DMRS port 12 adopts a mask sequence with a length of 12, which is mapped on subcarriers 0 to 5 corresponding to two OFDM symbols.

In the new mask sequences of length 12 shown in Table 10 or Table 11, any two mask sequences are orthogonal, that is, the 12-length mask sequences corresponding to any two ports in the newly added ports are orthogonal . In addition, the cross-correlation coefficient between the mask sequence corresponding to any one of the existing Type 2 DMRS ports and any one of the new 12 mask sequences shown in Table 10 or Table 11 is:

Specifically, for the existing NR Type 2 DMRS port 0, according to the rule shown in Figure 4, the corresponding DMRS mask sequence extended to a length of 12 can be expressed as {+1 +1 0 0 0 0 +1 +1 0 0 0 0} . The cross-correlation coefficient between this sequence and any of the new mask sequences in Table 8 or Table 11 is

Therefore, for the mask sequence corresponding to the newly designed DMRS port, the mask sequence corresponding to the existing DMRS port maintains an extremely low cross-correlation characteristic, so that the quality of the channel estimation can be guaranteed to the maximum extent.

Taking FIG. 6 as an example, the m-th element r(m) in the DMRS sequence corresponding to port p in the newly added 12 DMRS ports is mapped to the resource element RE with index (k,l) _p,μ according to the following rules superior. Among them, the RE with index (k, l) _{p, μ} corresponds to the OFDM symbol with index l in one slot in the time domain, and corresponds to the subcarrier with index k in the frequency domain, and the mapping rules satisfy:

p is the index of the DMRS port,

is the symbol index of the starting OFDM symbol occupied by the DMRS modulation symbol or the symbol index of the reference OFDM symbol, w(k', l') is the frequency domain mask element corresponding to the subcarrier with index k' and the index of the subcarrier with index l' Time-domain mask element corresponding to the OFDM symbol. μ represents the subcarrier spacing parameter,

is the power scaling factor.

Corresponding to the mask sequence shown in Table 10, the value of w(k', l') corresponding to the DMRS port p can be determined according to Table 12.

Table 12 The new design length is 12 mask sequences corresponding to the mapping rules (corresponding to Table 10)

Corresponding to the mask sequence shown in Table 11, the value of w(k', l') corresponding to the DMRS port p can be determined according to Table 13.

Table 13 The new design length is 12 mask sequences corresponding to the mapping rules (corresponding to Table 11)

The present application aims at the port expansion method of NR Type 2 DMRS. In the same time-frequency resource block, the existing NR Type 2 DMRS port and the newly added DMRS port respectively adopt a mask sequence of length 4 and a mask of length 12 sequence. By design, any two sequences of the 12 mask sequences of length 12 are orthogonal. Any sequence in the mask sequence of length 4 and any sequence in the set of mask sequences of length 12 guarantee extremely low cross-correlation. Therefore, the capacity of the DMRS port can be doubled without increasing the time-frequency resources, and the interference between the original port and the newly added port of the protocol can be minimized, and the quality of the channel estimation can be guaranteed.

In another implementation manner, in order to multiplex more DMRS ports in the same time-frequency resource and ensure that the newly added DMRS ports do not affect the channel estimation performance of the existing DMRS ports, the existing ports and the new DMRS ports can also be combined. The additional ports are multiplexed by frequency division. For example, for Type 2 DMRS, 12 DMRS ports are divided into 3 CDM groups. The six consecutive subcarriers and two OFDM symbols are divided into three time-frequency resource subblocks, and each time-frequency resource subblock includes two consecutive subcarriers and two OFDM symbols. In an implementation manner, one time-frequency resource sub-block corresponds to one CDM group. As shown in FIG. 3 , the DMRS signals corresponding to the four DMRS ports included in each CDM group are mapped on all REs included in the same resource sub-block. In an implementation manner, the existing DMRS ports belong to 4 DMRS ports included in 1 CDM group among 3 CDM groups, the existing ports occupy one sub-block of the 3 time-frequency resource sub-blocks, and the newly added ports can occupy The remaining 2 sub-blocks in the 3 time-frequency resource sub-blocks. As shown in Figure 8, existing ports 0 to 3 correspond to CDM group 0, and are mapped to two consecutive subcarriers (subcarrier 0 and subcarrier 1) and two consecutive OFDM symbols ( On the 4 REs corresponding to symbol 0 and symbol 1). To ensure compatibility, existing ports 0 to 3 can be assigned to existing devices (existing devices cannot learn about newly added ports, and do not have the ability to detect newly added ports). The newly added ports 4 to 19 correspond to CDM group 1, and are mapped to four consecutive subcarriers (subcarrier 2, subcarrier 3, subcarrier 4, and subcarrier 5) and two consecutive subcarriers based on an orthogonal mask sequence of length 8. 8 REs corresponding to OFDM symbols (symbol 0 and symbol 1). The newly added ports 4 to 19 can be assigned to new devices (the newly added ports can be known and the newly added ports can be detected).

In another implementation manner, the existing port is mapped to two consecutive subcarriers (subcarrier 4 and subcarrier 5) and two consecutive OFDM symbols (symbol 0 and symbol 1) based on an orthogonal mask sequence of length 4 on the corresponding 4 REs. In order to ensure compatibility, existing ports can be allocated to existing devices (existing devices cannot learn about newly added ports, and do not have the ability to detect newly added ports). The new port is mapped to four consecutive subcarriers (subcarrier 0, subcarrier 1, subcarrier 2, and subcarrier 3) and two consecutive OFDM symbols (symbol 0 and symbol 1) based on an orthogonal mask sequence of length 8 ) on the corresponding 8 REs. The newly added port can be assigned to a new device (it can learn about the newly added port and have the ability to detect the newly added port).

In another implementation manner, the existing DMRS ports belong to the 8 DMRS ports included in 2 CDM groups in the 3 CDM groups, the existing ports can occupy 2 sub-blocks in the 3 time-frequency resource sub-blocks, and the new ports can be added. It can occupy the remaining 1 sub-block in the 3 time-frequency resource sub-blocks. Specifically, the existing DMRS ports occupy CDM group 0 and CDM group 1, that is, the existing DMRS ports are mapped to four consecutive subcarriers (subcarrier 0, subcarrier 1, subcarrier 2, and subcarrier 3). The newly added DMRS ports occupy CDM group 2, that is, the existing DMRS ports are mapped to two consecutive subcarriers (subcarrier 4 and subcarrier 5). Or the existing DMRS ports occupy CDM group 1 and CDM group 2, that is, the existing DMRS ports are mapped to four consecutive subcarriers (subcarrier 2, subcarrier 3, subcarrier 4, and subcarrier 5). The newly added DMRS ports occupy CDM group 0, that is, the existing DMRS ports are mapped to two consecutive subcarriers (subcarrier 0 and subcarrier 1).

Assuming that the existing DMRS port belongs to the 4 DMRS ports included in 1 CDM group among the 3 CDM groups, the existing port occupies one sub-block of the 3 time-frequency resource sub-blocks, and the newly added port can occupy 3 time-frequency resource sub-blocks. Taking the case of the remaining two sub-blocks in the block as an example, multiple mask sequence sets with a length of 8 can also be designed, wherein one mask sequence set contains 8 mask sequences. Each mask sequence corresponds to a newly added DMRS port.

Taking two mask sequence sets with a length of 8 as an example, 8 DMRS ports can be added. Taking three mask sequence sets with a length of 8 as an example, 16 DMRS ports can be added.

For example, the orthogonal mask sequences included in the mask sequence set with a length of 8 are shown in Table 14 to Table 16.

Table 14 Mask sequence set 1 of length 8

Table 15 Mask sequence set 2 of length 8

Table 16 Mask sequence set 3 of length 8

Each mask sequence in the new set of mask sequences of length 8 shown in Tables 14 to 16 corresponds to a DMRS port (hereinafter referred to as newly added ports). One element included in each sequence corresponds to one RE included in the time-frequency resource block shown in FIG. 7 .

Specifically, for a DMRS port, corresponding to a mask sequence with a length of 8 in Table 14 to Table 16, the corresponding rules of the mask sequence element index and the time-frequency resource RE are shown in FIG. 8 . The mask sequence elements corresponding to the mask sequence element indices 0 to 3 in Tables 14 to 16 correspond to the 4 subcarriers of the first OFDM symbol respectively; the mask sequence elements corresponding to the mask sequence element indices 4 to 7 in Tables 14 to 16 The code sequence elements correspond to the 4 subcarriers of the second OFDM symbol respectively.

It should be understood that FIG. 8 is an example and not a limitation, and the mask sequence elements may also follow other mapping rules. For example, the 8 elements contained in a sequence with a length of 8 may be mapped on subcarriers 0 to 3, and the existing ports correspond to The 4 elements included in the sequence of length 4 may be mapped on subcarriers 4 to 5, which are not limited in this application.

The DMRS port corresponding to the mask sequence of length 8 (newly designed mask sequence) and the DMRS port corresponding to the mask sequence of length 4 (the existing mask sequence of NR length 4) are mapped by frequency division multiplexing In the time-frequency resource block of 12 REs. Taking the use of two mask sequence sets with a length of 8 to add 8 DMRS ports as an example, the correspondence between the DMRS ports and the mask sequence sets and REs included in the time-frequency resource block is shown in FIG. 8 . For the 4 REs composed of subcarrier 0 and subcarrier 1 corresponding to OFDM symbol 0 and symbol 1, the DMRS symbols corresponding to the 4 DMRS ports are mapped, and the 4 REs correspond to the existing mask sequences with NR length 4 respectively. For the 8 REs composed of subcarriers 2 to 5 corresponding to OFDM symbol 0 and symbol 1, the DMRS symbols corresponding to 16 DMRS ports are mapped, corresponding to port indices 4 to 19, and different 8-length mask sequences are used for multiplexing. on all 8 REs.

Taking DMRS port 0 and DMRS port 4 as an example, DMRS port 0 adopts a mask sequence with a length of 4, which is mapped on subcarrier 0 and subcarrier 1 corresponding to two OFDM symbols. The DMRS port 4 adopts a mask sequence with a length of 8, which is mapped on the subcarriers 2 to 5 corresponding to the two OFDM symbols.

In the three sets of mask sequence sets with length 8 shown in Tables 12 to 14, any two mask sequences in each mask sequence set are orthogonal. In addition, in any two mask sequence sets, each mask sequence set selects a mask sequence, then the cross-correlation coefficient between the two mask sequences is

Therefore, as shown in the DMRS resource mapping method shown in Figure 8, a mask sequence group with a length of 4 is reserved, which can be used to be compatible with the existing NR Type 2 DMRS. In addition, a new mask sequence group with a length of 8 is added, and the cross-correlation between the mask sequences in this sequence group is low, so that it can ensure that more DMRS ports are multiplexed in fixed time-frequency resources at the same time. , to ensure the channel estimation performance.

Taking FIG. 8 as an example, the port p in the 20 DMRS ports corresponds to the mth r(m) in the DMRS sequence, and is mapped to the RE with the index (k,l) _p,μ according to the following rules. Among them, the RE with index (k, l) _{p, μ} corresponds to the OFDM symbol with index l in one slot in the time domain, and corresponds to the subcarrier with index k in the frequency domain, and the mapping rules satisfy:

p is the index of the DMRS port,

to map to the DMRS modulation symbol corresponding to port p on the RE with index (k,l) _p,μ ,

is the symbol index of the starting OFDM symbol occupied by the DMRS modulation symbol or the symbol index of the reference OFDM symbol, w(k', l') is the mask sequence corresponding to the OFDM symbol with index l' and the subcarrier with index k' element. μ represents the subcarrier spacing parameter,

is the power scaling factor.

Corresponding to the mask sequences shown in Tables 14 and 15, the value of w(k', l') corresponding to the DMRS port p can be determined according to Table 17.

Table 17 New design mask sequence corresponding mapping rules (corresponding to Table 14 and Table 15)

For the port expansion method of NR Type 2 DMRS, in the same time-frequency resource block, 6 subcarriers are divided into 2 time-frequency resource subgroups by frequency division, one subgroup contains 4 REs, the other The subgroup contains the remaining 8 REs. For a subgroup containing 4 REs, a mask sequence with a length of 4 is used to map 4 DMRS ports correspondingly. For a subgroup including 8 REs, 2 sets of mask sequences with a length of 8 are used to map 16 DMRS ports, or 3 sets of mask sequences with a length of 8 are used to map 24 DMRS ports. By design, any two sequences in each set of length 8 mask sequences are orthogonal. Very low cross-correlation is guaranteed between any two mask sequences of length 8 belonging to different groups. Therefore, without increasing the time-frequency resources, it can achieve 0.6 times or 1.3 times the capacity expansion of the DMRS ports while ensuring compatibility with the existing DMRS ports, and minimize the interference between the newly added ports to ensure channel estimation. the quality of.

FIG. 11 is a schematic diagram of a communication apparatus provided by an embodiment of the present application. As shown in FIG. 11 , the communication apparatus 2000 may include a receiving unit 2100 and a sending unit 2200 . Optionally, the communication apparatus may further include a processing unit 2200 .

The receiving unit 2100 may be a receiver, an input interface, a pin or a circuit, and the like. The receiving unit 2100 may be configured to perform the receiving steps in the foregoing method embodiments.

The sending unit 2200 may be a transmitter, an output interface, a pin or a circuit, and the like. The sending unit 2200 may be configured to perform the receiving steps in the above method embodiments.

It should be understood that the receiving unit 2100 and the transmitting unit 2200 may be combined as a transceiver unit. The transceiving unit may include a transmitting unit and/or a receiving unit. The transceiver unit may be a transceiver (including a transmitter and/or a receiver), an input/output interface (including an input and/or output interface), a pin or a circuit, and the like.

The processing unit 2300 may be a processor (which may include one or more), a processing circuit with a processor function, etc., and may be used to perform other steps in the foregoing method embodiments except for sending and receiving.

Optionally, the communication device may further include a storage unit, which may be a memory, an internal storage unit (eg, a register, a cache, etc.), an external storage unit (eg, a read-only memory, a random access memory, etc.), etc. . The storage unit is used for storing instructions, and the processing unit 530 executes the instructions stored in the storage unit, so that the communication device executes the above method.

In a possible design, the communication apparatus 2000 may correspond to the receiving device in the above method embodiment, and may perform the operations performed by the receiving device in the above method.

In one example, the receiving unit 2100 is configured to receive a reference signal, and perform channel estimation after decoding.

In another possible design, the communication apparatus 2000 may correspond to the sending device in the above method embodiment, and may perform the operations performed by the sending device in the above method.

In an example, the processing unit 2300 generates a check sequence, maps the root sequence and the check sequence to corresponding time-frequency resources, and generates a reference signal. The generation method of the sequence is the same as the above, and will not be repeated here.

The transmitting unit 2200 transmits the reference signal.

In a possible design, the processing unit generates a check sequence with a length of 12, which is mapped to 6 consecutive subcarriers and 2 OFDM symbols, any sequence contains 12 elements, and any element is mapped to a single RE Above, the REs mapped by elements within the same sequence are different from each other.

In another possible design, the processing unit generates a check sequence with a length of 8, which is mapped to 6 consecutive subcarriers and 2 OFDM symbols, any sequence contains 8 elements, and any element is mapped to a separate one On REs, the REs mapped to elements in the same sequence are different from each other, and the REs mapped to the existing four ports are also different from each other. That is, REs are no longer multiplexed.

It should be understood that the above division of each unit is only functional division, and other division methods may be used in actual implementation.

It should also be understood that the above processing unit may be implemented by hardware or software, or may be implemented by a combination of software and hardware.

It should also be understood that when the communication device 2000 is a network device, the receiving unit 2100 and the sending unit 2200 in the communication device may correspond to the RRU 3100 in the network device 2000 shown in FIG. 12 , and the processing unit 2300 in the communication device It may correspond to the BBU 3200 in the network device 2000 shown in FIG. 28 . When the communication apparatus 2000 is a chip configured in a network device, the transceiver unit 2100 in the communication apparatus may be an input/output interface.

It should also be understood that when the communication device 2000 is a terminal device, the receiving unit 2100 and the sending unit 2200 in the communication device 2000 may correspond to the transceiver 4002 in the terminal device 4000 shown in FIG. The processing unit 2300 may correspond to the processor 4001 in the terminal device 4000 shown in FIG. 13 .

FIG. 12 is a schematic structural diagram of a network device provided by an embodiment of the present application, which may be, for example, a schematic structural diagram of a base station. The network device 3000 may perform the functions of the network device in the foregoing method embodiments.

As shown in the figure, the network device 3000 may include one or more radio frequency units, such as a remote radio unit (remote radio unit, RRU) 3100 and one or more baseband units (BBU) (also referred to as distributed units ( DU))3200. The RRU 3100 may be called a transceiver unit or a communication unit, which corresponds to the transceiver unit 2100 in FIG. 11 .

Optionally, the transceiver unit 3100 may also be referred to as a transceiver, a transceiver circuit, or a transceiver, etc., which may include at least one antenna 3101 and a radio frequency unit 3102 . Optionally, the transceiver unit 3100 may include a receiving unit and a sending unit, the receiving unit may correspond to a receiver (or called a receiver, a receiving circuit), and the sending unit may correspond to a transmitter (or called a transmitter, a sending circuit). The RRU 3100 part is mainly used for the transceiver of radio frequency signals and the conversion of radio frequency signals and baseband signals. The part of the BBU 3200 is mainly used to perform baseband processing, control the base station, and the like. The RRU 3100 and the BBU 3200 may be physically set together, or may be physically separated, that is, a distributed base station.

The BBU 3200 is the control center of the base station, and can also be called a processing unit, which can correspond to the processing unit 2200 in FIG. 11 , and is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, spread spectrum, and the like. For example, the BBU (processing unit) may be used to control the base station to perform the operation procedures related to the network device in the foregoing method embodiments.

In an example, the BBU 3200 may be composed of one or more boards, and the multiple boards may jointly support a wireless access network (such as an LTE network) of a single access standard, or may respectively support a wireless access network of different access standards. Wireless access network (such as LTE network, 5G network or other network). The BBU 3200 also includes a memory 3201 and a processor 3202. The memory 3201 is used to store necessary instructions and data. The processor 3202 is configured to control the base station to perform necessary actions, for example, to control the base station to perform the operation flow of the network device in the foregoing method embodiments. The memory 3201 and processor 3202 may serve one or more single boards. That is to say, the memory and processor can be provided separately on each single board. It can also be that multiple boards share the same memory and processor. In addition, necessary circuits may also be provided on each single board.

It should be understood that the network device 3000 shown in FIG. 12 can implement various processes related to the network device in the foregoing method embodiments. The operations or functions of each module in the network device 3000 are respectively to implement the corresponding processes in the foregoing method embodiments. For details, reference may be made to the descriptions in the foregoing method embodiments, and to avoid repetition, the detailed descriptions are appropriately omitted here.

The above-mentioned BBU 3200 may be used to perform the actions performed by the network device described in the foregoing method embodiments, and the RRU 3100 may be used to perform the actions of sending and receiving by the network device described in the foregoing method embodiments. For details, please refer to the descriptions in the foregoing method embodiments, which will not be repeated here.

FIG. 13 is a schematic structural diagram of a terminal device 4000 provided by an embodiment of the present application. As shown in the figure, the terminal device 4000 includes a processor 4001 and a transceiver 4002 . Optionally, the terminal device 4000 may further include a memory 4003 . Among them, the processor 4001, the transceiver 4002 and the memory 4003 can communicate with each other through an internal connection path to transmit control and/or data signals, the memory 4003 is used to store computer programs, and the processor 4001 is used to retrieve data from the memory 4003. The computer program is invoked and executed to control the transceiver 4002 to send and receive signals.

The above-mentioned processor 4001 and the memory 4003 can be combined into a processing device 4004, and the processor 4001 is configured to execute the program codes stored in the memory 4003 to realize the above-mentioned functions. It should be understood that the processing device 4004 shown in the figure is only an example. During specific implementation, the memory 4003 may also be integrated in the processor 4001 or independent of the processor 4001 . This application does not limit this.

The above-mentioned terminal device 4000 may further include an antenna 4010 for transmitting the uplink data or uplink control signaling output by the transceiver 4002 through wireless signals.

It should be understood that the terminal device 4000 shown in FIG. 13 can implement various processes related to the terminal device in the foregoing method embodiments. The operations or functions of each module in the terminal device 4000 are respectively to implement the corresponding processes in the above method embodiments. For details, reference may be made to the descriptions in the foregoing method embodiments, and to avoid repetition, the detailed descriptions are appropriately omitted here.

Optionally, the above-mentioned terminal device 4000 may further include a power supply 4005 for providing power to various devices or circuits in the terminal device.

In addition, in order to make the functions of the terminal device more complete, the terminal device 4000 may further include one or more of an input unit 4006, a display unit 4007, an audio circuit 4008, a camera 4009, a sensor 4011, etc., the audio circuit A speaker 40081, a microphone 40082, and the like may also be included.

It should be understood that the processing device 4004 or the processor 4001 may be a chip. For example, the processing device 4004 or the processor 4001 may be a field programmable gate array (FPGA), a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (application specific integrated circuit) integrated circuit, ASIC), off-the-shelf programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and can also be a system on chip (system on chip, SoC), It can also be a central processing unit (CPU), a network processor (NP), a digital signal processing circuit (DSP), or a microcontroller (microcontroller). controller unit, MCU), it can also be a programmable logic device (PLD) or other integrated chips. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in conjunction with the embodiments of the present application may be directly embodied as executed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules may be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other storage media mature in the art. 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.

A memory (eg, memory 4003) in this application may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically programmable Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory. Volatile memory may be random access memory (RAM), which acts as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), 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 link dynamic random access memory (synchlink DRAM, SLDRAM) ) and direct memory bus random access memory (direct rambus RAM, DR RAM).

According to the method provided by the embodiment of the present application, the present application also provides a computer program product, the computer program product includes: computer program code, when the computer program code is run on a computer, the computer executes the execution of the aforementioned terminal device. method.

According to the method provided by the embodiment of the present application, the present application also provides a computer program product, the computer program product includes: computer program code, when the computer program code is run on a computer, the computer is made to execute the above-mentioned network device. method.

According to the methods provided by the embodiments of the present application, the present application further provides a computer-readable medium, where program codes are stored in the computer-readable medium, and when the program codes are run on a computer, the computer is made to execute the execution of the aforementioned terminal device. method.

According to the method provided by the embodiment of the present application, the present application further provides a computer-readable medium, where the computer-readable medium stores program codes, when the program codes are executed on a computer, the computer is made to execute the execution of the aforementioned network device. method.

According to the method provided by the embodiment of the present application, the present application further provides a system, which includes a network device. Optionally, the system may also include a terminal device.

An embodiment of the present application further provides a processing apparatus, including a processor and an interface, where the processor is configured to execute the method in any of the foregoing method embodiments.

It should be understood that the above processing device may be a chip. For example, the processing device may be a field programmable gate array (FPGA), a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC) , off-the-shelf programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, can also be system on chip (system on chip, SoC), can also be central processing It can be a central processor unit (CPU), a network processor (NP), a digital signal processing circuit (DSP), or a microcontroller (MCU) , it can also be a programmable logic device (PLD) or other integrated chips. The methods, steps, and logic block diagrams disclosed in the embodiments of this application can be implemented or executed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in conjunction with the embodiments of the present application may be directly embodied as executed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules may be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other storage media mature in the art. 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.

In the above-mentioned embodiments, it may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented in software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer may be a general purpose computer, special purpose computer, computer network, or other programmable device. The computer instructions may be stored in or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be downloaded from a website site, computer, server or data center Transmission to another website site, computer, server, or data center by wire (eg, coaxial cable, optical fiber, digital subscriber line, DSL) or wireless (eg, 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, data center, etc. that includes an integration of one or more available media. The available media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, high-density digital video discs (DVDs)), or semiconductor media (eg, solid state discs, SSD)) etc.

The terms "component", "module", "system" and the like are used in this specification to refer to a computer-related entity, hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a component may be, but is not limited to, a process running on a processor, a processor, an object, an executable, a thread of execution, a program, or a computer. By way of illustration, both an application running on a computing device and the computing device may be components. One or more components may reside within a process or thread of execution, and a component may be localized on one computer or distributed between 2 or more computers. In addition, these components can execute from various computer readable media having various data structures stored thereon. A component may, for example, pass a signal through a local system based on a signal having one or more data packets (such as data from two components interacting with another component between a local system, a distributed system, or a network, such as the Internet interacting with other systems through signals). or remote process to communicate.

It is to be understood that reference throughout the specification to an "embodiment" means that a particular feature, structure, or characteristic associated with the embodiment is included in at least one embodiment of the present application. Thus, various embodiments throughout this specification are not necessarily necessarily referring to the same embodiment. Furthermore, the particular features, structures or characteristics may be combined in any suitable manner in one or more embodiments.

It should be understood that, in the embodiments of the present application, the numbers "first", "second"... are only used to distinguish different objects, such as to distinguish different network devices, and do not limit the scope of the embodiments of the present application. The example is not limited to this.

It should also be understood that in this application, "when", "if" and "if" all mean that the network element will make corresponding processing under certain objective circumstances, not a limited time, and does not require the network element There must be a judgmental action during implementation, and it does not mean that there are other restrictions.

It should also be understood that, in this application, "at least one" refers to one or more, and "a plurality" refers to two or more.

It should also be understood that, in each embodiment of the present application, "B corresponding to A" indicates 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 only determined according to A, and B may also be determined according to A and/or other information.

It should also be understood that the term "and/or" in this document is only an association relationship for describing associated objects, indicating that there can be three kinds of relationships, for example, A and/or B, which can mean that A exists alone, and A and B exist at the same time. B, there are three cases of B alone. In addition, the character "/" in this document generally indicates that the related objects are an "or" relationship.

In this application, meanings similar to the expression "an item includes one or more of the following: A, B, and C" generally means that the item can be any of the following: A; B, unless otherwise specified. ;C;A and B;A and C;B and C;A,B and C;A and A;A,A and A;A,A and B;A,A and C,A,B and B;A , C and C; B and B, B, B and B, B, B and C, C and C; C, C and C, and other combinations of A, B and C. A total of three elements of A, B and C are used as examples above to illustrate the optional items of the item. When the expression is "the item includes at least one of the following: A, B, ..., and X", it means that the expression is in When there are more elements, then the items to which the item can apply can also be obtained according to the preceding rules.

Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described systems, devices and units may refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a removable hard disk, a read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk and other media that can store program codes.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited to this. should be covered within the scope of protection of this application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

A method for transmitting a reference signal, comprising:

sending a first reference signal on the first resource;

sending a second reference signal on the second resource,

Wherein, the first resource includes the first time domain resource in the time domain, includes the first frequency domain resource in the frequency domain, the second resource includes the first time domain resource in the time domain, and includes the first time domain resource in the frequency domain. The above includes the second frequency domain resource, the first frequency domain resource is a part of the second frequency domain resource, or the intersection of the first frequency domain resource and the second frequency domain resource is empty.
The method according to claim 1, wherein the first reference signal corresponds to a first sequence, the second reference signal corresponds to a second sequence, and the number of elements included in the first sequence is smaller than that of the first sequence. A binary sequence includes the number of elements.
The method according to claim 2, wherein the first sequence belongs to a first sequence set, the second sequence belongs to a second sequence set, the first sequence set includes at least one sequence, and the second sequence The sequence set includes at least one sequence, the sequences included in the first sequence set include the same number of elements, and the sequences included in the second sequence set include the same number of elements.
The method according to claim 3, wherein when the first sequence set includes at least two sequences and the second sequence set includes at least two sequences,

The sequences included in the first sequence set are orthogonal to each other,

The sequences included in the second sequence set are orthogonal to each other.
The method according to any one of claims 2 to 4, wherein the number of elements included in the second sequence is 12.
The method according to any one of claims 1 to 5, wherein the reference signal sequence of the second reference signal
elements mapped on the kth subcarrier and the lth symbol
Satisfy the following relationship:

where k is an integer from 0 to K-1, and K is
The total number of subcarriers occupied in the frequency domain, l is 0 or 1, β is a non-zero complex number, the number of elements included in the mask sequence w is I, and i satisfies i=k mod(I/2)+l· (I/2) or i=(k mod(I/2))·2+l,r(k,l) is the element of the base sequence r mapped on the kth subcarrier and the lth symbol, c(t ) is a block sequence, and t satisfies t=floor(k/(I/2)).
The method according to any one of claims 3 to 6, wherein any sequence included in the first sequence set is orthogonal to any sequence included in the first subset included in the second sequence set.
The method of claim 7, wherein the sequences included in the first subset are half of the sequences included in the second sequence set.
The method according to claim 8, characterized in that, a matrix formed by taking the sequences included in the second sequence set as row vectors
Satisfy the following relationship:

where w k is the row vector corresponding to the kth sequence contained in the second sequence set, k is an integer from 0 to N-1, and b satisfies the following relationship:

or,

or,
The method according to claim 6, wherein a matrix formed by taking the sequences included in the second sequence set as row vectors
Satisfy the following relationship:

or,

where w k is the row vector corresponding to the kth sequence contained in the second sequence set, and k is an integer from 0 to N-1.
The method according to any one of claims 5 to 10, wherein the first resource includes 4 resource elements (REs), the first time domain resource includes 2 OFDM symbols, and the first frequency domain resource includes 2 OFDM symbols. The resource includes 2 consecutive subcarriers, the second resource includes 12 REs, the second resource includes the 2 OFDM symbols, the second frequency domain resource includes 6 consecutive subcarriers, and the second resource includes 6 consecutive subcarriers. A frequency domain resource is a subset of the second frequency domain resource.
The method according to any one of claims 2 to 4, wherein the number of elements included in the second sequence is 8.
The method according to claim 12, wherein the first resource includes four resource elements (RE), the first time domain resource includes two OFDM symbols, and the first frequency domain resource includes two consecutive OFDM symbols. subcarriers, the second resource includes 8 REs, the second resource corresponds to the 2 OFDM symbols, and the second frequency domain resource includes 4 consecutive subcarriers.
The method according to any one of claims 1 to 13, wherein elements included in any sequence in the first sequence set are in a one-to-one correspondence with resource elements RE included in the first resource, Elements included in any sequence in the second sequence set are in one-to-one correspondence with REs included in the second resource.
A method for transmitting a reference signal, comprising:

receiving a first reference signal on a first resource;

receiving a second reference signal on a second resource,

Wherein, the first resource includes the first time domain resource in the time domain, includes the first frequency domain resource in the frequency domain, the second resource includes the first time domain resource in the time domain, and includes the first time domain resource in the frequency domain. including the second frequency domain resource, the first frequency domain resource is a part of the second frequency domain resource, or the intersection of the first frequency domain resource and the second frequency domain resource is empty;

The channel is detected based on the reference signal.
The method according to claim 15, wherein the first reference signal corresponds to a first sequence, the second reference signal corresponds to a second sequence, and the number of elements included in the first sequence is smaller than that of the first sequence. A binary sequence includes the number of elements.
The method of claim 16, wherein the first sequence belongs to a first sequence set, the second sequence belongs to a second sequence set, the first sequence set includes at least one sequence, the second sequence The sequence set includes at least one sequence, the sequences included in the first sequence set include the same number of elements, and the sequences included in the second sequence set include the same number of elements.
The method according to claim 17, wherein when the first sequence set includes at least two sequences and the second sequence set includes at least two sequences,

The sequences included in the first sequence set are orthogonal to each other,

The sequences included in the second sequence set are orthogonal to each other.
The method according to any one of claims 16 to 18, wherein the number of elements included in the second sequence is 12.
The method according to any one of claims 16 to 19, wherein the reference signal sequence of the second reference signal
elements mapped on the kth subcarrier and the lth symbol
Satisfy the following relationship:

where k is an integer from 0 to K-1, and K is
The total number of subcarriers occupied in the frequency domain, l is 0 or 1, β is a non-zero complex number, the number of elements included in the mask sequence w is I, and i satisfies i=k mod(I/2)+l· (I/2) or i=(k mod(I/2))·2+l,r(k,l) is the element of the base sequence r mapped on the kth subcarrier and the lth symbol, c(t ) is a block sequence, and t satisfies t=floor(k/(I/2)).
The method according to any one of claims 17 to 20, wherein any sequence included in the first sequence set is orthogonal to any sequence included in the first subset included in the second sequence set.
The method of claim 21, wherein the sequences included in the first subset are half of the sequences included in the second set of sequences.
The method according to claim 22, wherein a matrix formed by taking the sequences included in the second sequence set as row vectors
Satisfy the following relationship:

where w k is the row vector corresponding to the kth sequence contained in the second sequence set, k is an integer from 0 to N-1, and b satisfies the following relationship:

or,

or,
The method according to claim 20, wherein a matrix formed by taking the sequences included in the second sequence set as row vectors
Satisfy the following relationship:

or,
The method according to any one of claims 19 to 24, wherein the first resource includes 4 resource elements (REs), the first time domain resource includes 2 OFDM symbols, and the first frequency domain resource includes 2 OFDM symbols. The resource includes 2 consecutive subcarriers, the second resource includes 12 REs, the second resource corresponds to the 2 OFDM symbols, the second frequency domain resource includes 6 consecutive subcarriers, the first A frequency domain resource is a subset of the second frequency domain resource.
The method according to any one of claims 16 to 18, wherein the number of elements included in the second sequence is 8.
The method according to claim 26, wherein the first resource includes four resource elements (RE), the first time domain resource includes two OFDM symbols, and the first frequency domain resource includes two consecutive OFDM symbols. subcarriers, the second resource includes 8 REs, the second resource corresponds to the 2 OFDM symbols, and the second frequency domain resource includes 4 consecutive subcarriers.
The method according to any one of claims 15 to 27, wherein any element included in any sequence in the first sequence set is in a one-to-one correspondence with the resource element RE included in the first resource There is a one-to-one correspondence between any element included in any sequence in the second sequence set and the RE included in the second resource.
A device for transmitting a reference signal, comprising:

a processing unit for determining the first resource and the second resource;

a transceiver unit, configured to send the first reference signal on the first resource and send the second reference signal on the second resource,

The first resource includes the first time domain resource in the time domain, the first frequency domain resource includes the first frequency domain resource in the frequency domain, the second resource includes the first time domain resource in the time domain, and the frequency domain includes the first time domain resource. The above includes the second frequency domain resource, the first frequency domain resource is a part of the second frequency domain resource, or the intersection of the first frequency domain resource and the second frequency domain resource is empty.
The apparatus according to claim 29, wherein the first reference signal corresponds to a first sequence, the second reference signal corresponds to a second sequence, and the number of elements included in the first sequence is smaller than that of the first sequence. A binary sequence includes the number of elements.
The apparatus according to claim 30, wherein the first sequence belongs to a first sequence set, the second sequence belongs to a second sequence set, the first sequence set includes at least one sequence, the second sequence The sequence set includes at least one sequence, the sequences included in the first sequence set include the same number of elements, and the sequences included in the second sequence set include the same number of elements.
The apparatus according to claim 31, wherein when the first sequence set includes at least two sequences, and the second sequence set includes at least two sequences,

The sequences included in the first sequence set are orthogonal to each other,

The sequences included in the second sequence set are orthogonal to each other.
The apparatus according to any one of claims 30 to 32, wherein the number of elements included in the second sequence is 12.
The apparatus according to any one of claims 29 to 33, wherein the reference signal sequence of the second reference signal
elements mapped on the kth subcarrier and the lth symbol
Satisfy the following relationship:

where k is an integer from 0 to K-1, and K is
The total number of subcarriers occupied in the frequency domain, l is 0 or 1, β is a non-zero complex number, the number of elements included in the mask sequence w is I, and i satisfies i=k mod(I/2)+l· (I/2) or i=(k mod(I/2))·2+l,r(k,l) is the element of the base sequence r mapped on the kth subcarrier and the lth symbol, c(t ) is a block sequence, and t satisfies t=floor(k/(I/2)).
The apparatus according to any one of claims 31 to 34, wherein any sequence included in the first sequence set is orthogonal to any sequence included in the first subset included in the second sequence set.
36. The method of claim 35, wherein the sequences included in the first subset are half of the sequences included in the second set of sequences.
The device according to claim 36, characterized in that a matrix formed by taking the sequences included in the second sequence set as row vectors
Satisfy the following relationship:

where w k is the row vector corresponding to the kth sequence contained in the second sequence set, k is an integer from 0 to N-1, and b satisfies the following relationship:

or,

or,
The apparatus according to claim 34, characterized in that a matrix formed by taking the sequences included in the second sequence set as row vectors
Satisfy the following relationship:

or,

where w k is the row vector corresponding to the kth sequence contained in the second sequence set, and k is an integer from 0 to N-1.
The apparatus according to any one of claims 33 to 38, wherein the first resource includes 4 resource elements (RE), the first time domain resource includes 2 OFDM symbols, and the first frequency domain resource includes 2 OFDM symbols. The resource includes 2 consecutive subcarriers, the second resource includes 12 REs, the second resource includes the 2 OFDM symbols, the second frequency domain resource includes 6 consecutive subcarriers, and the second resource includes 6 consecutive subcarriers. A frequency domain resource is a subset of the second frequency domain resource.
The apparatus according to any one of claims 30 to 32, wherein the number of elements included in the second sequence is 8.
The apparatus according to claim 40, wherein the first resource includes four resource elements (RE), the first time domain resource includes two OFDM symbols, and the first frequency domain resource includes two consecutive subcarriers, the second resource includes 8 REs, the second resource corresponds to the 2 OFDM symbols, and the second frequency domain resource includes 4 consecutive subcarriers.
The method according to any one of claims 29 to 41, wherein elements included in any sequence in the first sequence set are in a one-to-one correspondence with resource elements RE included in the first resource, Elements included in any sequence in the second sequence set are in one-to-one correspondence with REs included in the second resource.
A device for transmitting a reference signal, comprising:

a transceiver unit, configured to receive the first reference signal on the first resource and receive the second reference signal on the second resource,

a processing unit, configured to detect the channel according to the reference signal,

Wherein, the first resource includes the first time domain resource in the time domain, includes the first frequency domain resource in the frequency domain, the second resource includes the first time domain resource in the time domain, and includes the first time domain resource in the frequency domain. The above includes the second frequency domain resource, the first frequency domain resource is a part of the second frequency domain resource, or the intersection of the first frequency domain resource and the second frequency domain resource is empty.
The apparatus according to claim 43, wherein the first reference signal corresponds to a first sequence, the second reference signal corresponds to a second sequence, and the number of elements included in the first sequence is smaller than that of the first sequence. A binary sequence includes the number of elements.
The apparatus of claim 44, wherein the first sequence belongs to a first sequence set, the second sequence belongs to a second sequence set, the first sequence set includes at least one sequence, the second sequence The sequence set includes at least one sequence, the sequences included in the first sequence set include the same number of elements, and the sequences included in the second sequence set include the same number of elements.
The apparatus according to claim 45, wherein when the first sequence set includes at least two sequences and the second sequence set includes at least two sequences,

The sequences included in the first sequence set are orthogonal to each other,

The sequences included in the second sequence set are orthogonal to each other.
The apparatus according to any one of claims 44 to 46, wherein the number of elements included in the second sequence is 12.
The apparatus according to any one of claims 43 to 47, wherein the reference signal sequence of the second reference signal
elements mapped on the kth subcarrier and the lth symbol
Satisfy the following relationship:

where k is an integer from 0 to K-1, and K is
The total number of subcarriers occupied in the frequency domain, l is 0 or 1, β is a non-zero complex number, the number of elements included in the mask sequence w is I, and i satisfies i=k mod(I/2)+l· (I/2) or i=(k mod (I/2))·2+l,r(k,l) is the element of the base sequence r mapped on the kth subcarrier and the lth symbol, c(t ) is a block sequence, and t satisfies t=floor(k/(I/2)).
The apparatus according to any one of claims 45 to 48, wherein any sequence included in the first sequence set is orthogonal to any sequence included in the first subset included in the second sequence set.
49. The method of claim 49, wherein the sequences included in the first subset are half of the sequences included in the second set of sequences.
The apparatus according to claim 50, characterized in that a matrix formed by taking the sequences included in the second sequence set as row vectors
Satisfy the following relationship:

where w k is the row vector corresponding to the kth sequence contained in the second sequence set, k is an integer from 0 to N-1, and b satisfies the following relationship:

or,

or,
The apparatus according to claim 48, characterized in that a matrix formed by taking the sequences included in the second sequence set as row vectors
Satisfy the following relationship:

or,

where w k is the row vector corresponding to the kth sequence contained in the second sequence set, and k is an integer from 0 to N-1.
The apparatus according to any one of claims 47 to 52, wherein the first resource includes 4 resource elements (REs), the first time domain resource includes 2 OFDM symbols, and the first frequency domain resource includes 2 OFDM symbols. The resource includes 2 consecutive subcarriers, the second resource includes 12 REs, the second resource includes the 2 OFDM symbols, the second frequency domain resource includes 6 consecutive subcarriers, and the second resource includes 6 consecutive subcarriers. A frequency domain resource is a subset of the second frequency domain resource.
The apparatus according to any one of claims 44 to 46, wherein the number of elements included in the second sequence is 8.
The apparatus according to claim 54, wherein the first resource includes four resource elements (RE), the first time domain resource includes two OFDM symbols, and the first frequency domain resource includes two consecutive subcarriers, the second resource includes 8 REs, the second resource corresponds to the 2 OFDM symbols, and the second frequency domain resource includes 4 consecutive subcarriers.
The method according to any one of claims 43 to 55, wherein elements included in any sequence in the first sequence set are in a one-to-one correspondence with resource elements RE included in the first resource, Elements included in any sequence in the second sequence set are in one-to-one correspondence with REs included in the second resource.
A communication device, characterized in that it comprises: a processor coupled with a memory, the memory is used to store a program or an instruction, when the program or instruction is executed by the processor, the device causes the device A method as claimed in any of claims 1 to 14, or alternatively, as claimed in any of claims 15 to 28, is performed.
A readable storage medium on which a computer program or instruction is stored, characterized in that, when the computer program or instruction is executed, the computer executes the method according to any one of claims 1 to 28.
A computer program product, comprising computer program instructions, the computer program instructions causing a computer to perform: the method of any one of claims 1 to 28.