WO2020088080A1

WO2020088080A1 - Method and device for transmitting reference signal

Info

Publication number: WO2020088080A1
Application number: PCT/CN2019/103696
Authority: WO
Inventors: 史桢宇; 王艺; 黄甦
Original assignee: 华为技术有限公司
Priority date: 2018-11-01
Filing date: 2019-08-30
Publication date: 2020-05-07
Also published as: CN111132221B; CN111132221A

Abstract

Provided in the present application is a method for transmitting a reference signal, comprising: a positioning reference signal (PRS) sequence is generated; the PRS sequence is mapped to target symbols in a target time slot, the target symbols comprising a plurality of successive symbols following a symbol carrying a control signal in the target time slot, and the length of the PRS sequence being N_RE×N^DL_RB, N^DL_RB being the total number of resource blocks (RB) allocated for downlink transmission, and N_RE being the number of target resource elements carrying a PRS on one target symbol in every RB; and the PRS sequence is sent to user equipment on the target REs. By means of the method for transmitting a reference signal provided in the present application, effective use of transmission resources and more precise positioning can be achieved.

Description

Method and equipment for transmitting reference signal

This application requires the priority of the Chinese patent application filed on November 01, 2018 in the Chinese Patent Office with the application number 201811292729.5 and the application name "Method and Equipment for Transmitting Reference Signals", the entire contents of which are incorporated by reference in this application .

Technical field

The present application relates to the field of communications, and more specifically, to a method and device for transmitting reference signals.

Background technique

In the wireless communication system, positioning has always existed as an important feature in the 3rd Generation Partnership Project (3rd Generation Partnership Project, 3GPP).

The long-term evolution (LTE) system mainly uses positioning technologies such as enhanced cell-ID (E-CID) positioning technology and time-of-arrival (OTDOA) positioning technology, etc. . Based on the definition of TS36.211 in the LTE system, the signals mapped to a transmission slot (slot) and sent to user equipment (UE) in the LTE system include positioning reference signals (PRS) for positioning And cell-specific reference signal (CRS). Among them, PRS and CRS coexist in a time slot.

However, the CRS is currently weakened in the new radio (NR) system. Therefore, in the NR system, it is necessary to provide a new method for transmitting PRS, so that the transmission of PRS based on this method can achieve the effective use of transmission resources .

Summary of the invention

The present application provides a method for transmitting a reference signal, which can effectively utilize transmission resources and achieve more accurate positioning.

In a first aspect, a method for transmitting a reference signal is provided, characterized in that the method is performed by a network device and includes: generating a positioning reference signal PRS sequence; mapping the PRS sequence to a target symbol in a target time slot, The target symbol includes multiple consecutive symbols after the symbol carrying the control signal in the target time slot, wherein the length of the PRS sequence is

Is the total number of resource blocks RB allocated for downlink transmission, and N _RE is the number of target resource element REs carrying PRS on one target symbol in each RB; PRS sequence is sent to the user equipment UE on the target RE.

Therefore, by carrying the PRS on multiple consecutive symbols after the symbol carrying the control signal (for example, physical downlink control channel (PDCCH)) in one RB, the symbol carrying the control signal in one RB is made After that, all consecutive symbols carry PRS, so as to realize the effective use of transmission resources. And the method for transmitting reference signals provided in this application can make the correlation between the mapped PRS sequences lower (for example, the PRS sequence The mutual correlation number can be kept below 0.06), so that more accurate positioning can be achieved.

In a possible implementation, mapping the PRS sequence to the target symbol in the target time slot includes:

The value of the index value m 'in the PRS sequence is mapped to the target RE on the target symbol based on the following formula:

Where l is the index value of the target symbol where the corresponding target RE is mapped after the value with the index value m is mapped, and k is the frequency domain position of the target RE after the value with the index value m is mapped,

For the number of RBs used to carry the PRS, v _shift represents the offset in the frequency domain, and v _shift is an integer greater than or equal to 0.

When a target time slot contains 14 symbols (symbol # 0 ～ symbol # 13), by mapping the values in the PRS sequence to symbol # 3 ～ symbol # 13 in a target time slot, the A PRS sequence is mapped on a plurality of consecutive symbols after the symbol of the control signal, so as to achieve effective utilization of transmission resources.

Where l is the index value of the target symbol where the corresponding target RE is mapped after the value with the index value m is mapped, and the value range of l is [ls, ls + lprs-1], where lprs is the symbol length carrying the PRS, The value range is [1,11], ls is the starting symbol index, the value range is [3,14-lprs], and k is the frequency domain position of the corresponding target RE after the value with the index value m is mapped,

When a target time slot contains 14 symbols (symbol # 0 ～ symbol # 13), by mapping the values in the PRS sequence to symbol # 3 ～ symbol # 13 in a target time slot, the At least one symbol on a plurality of consecutive symbols after the symbol of the control signal is mapped with a PRS sequence, thereby achieving flexible utilization of transmission resources.

When a target time slot contains 12 symbols (symbol # 0 ～ symbol # 11), the value in the PRS sequence is mapped to symbol # 3 ～ symbol # 11 in a target time slot, so that A PRS sequence is mapped on a plurality of consecutive symbols after the symbol of the control signal, so as to achieve effective utilization of transmission resources.

Where l is the index value of the target symbol where the corresponding target RE is mapped after the value with the index value m is mapped, and the value range of l is [ls, ls + lprs-1], where lprs is the symbol length carrying the PRS, The value range is [1,9], ls is the starting symbol index, the value range is [3,12-lprs], k is the frequency domain position of the corresponding target RE after the value of the index value m is mapped,

When a target time slot contains 12 symbols (symbol # 0 ～ symbol # 11), the value in the PRS sequence is mapped to symbol # 3 ～ symbol # 11 in a target time slot, so that At least one symbol on a plurality of consecutive symbols after the symbol of the control signal is mapped with a PRS sequence, thereby achieving flexible utilization of transmission resources.

In a possible implementation manner, the v _shift satisfies the following formula:

among them,

For the PRS identifier, C ₁ is a constant. Illustratively, its value may be at least 0, ₁ , 2, 3, 4, or 5.

Where l is the index value of the target symbol where the target RE corresponding to the value with index value m 'is mapped, and k is the frequency domain position of the target RE after the value with index value m' is mapped,

For the number of RBs carrying PRS k _{1, init} , k _{2, init} represents the offset in the frequency domain, k _{1, init} , k _{2, init} are greater than or equal to 0 and less than or equal to (12 / N _RE -1) integer, f _shift represents the offset in the time domain, f _shift is an integer greater than or equal to 0.

When mapping the PRS sequence, by taking into account the flexible mapping pattern of the demodulation reference signal (DMRS), a comb-shaped mapping pattern consistent with the DMRS mapping pattern is used to map the PRS sequence: in the target time slot Two target symbols are selected within the target RE, and the values in the PRS sequence are mapped on the target REs on the selected two target symbols, so as to realize the transmission resources on the basis of better combination with the mapping patterns of other signals in the NR system Effective use.

Alternatively, f _shift can be expressed as:

Where, C ₂ is a constant, and exemplarily, its value may be at least 0, 1, 2, 3, or 4.

Is the number of RBs used to carry PRS. k _{1, init} , k _{2, init} represents the offset in the frequency domain, k _{1, init} , k _{2, init} are integers greater than or equal to 0 and less than or equal to (12 / N _RE -1), f _shift represents the offset in the time domain, and f _shift is an integer greater than or equal to 0.

When mapping the PRS sequence, by taking into account the flexible mapping pattern of the DMRS, a comb-shaped mapping pattern consistent with the DMRS mapping pattern is used to map the PRS sequence: two target symbols are selected in the target time slot. The target REs on the two target symbols map the values in the PRS sequence, so as to realize the effective utilization of transmission resources on the basis of better combination with the mapping patterns of other signals in the NR system.

Alternatively, f _shift can be expressed as:

Where, C ₃ is a constant, and exemplarily, its value may be at least 0, 1, 2, or 3.

In a second aspect, a communication device is provided, which includes a module for performing the method in the first aspect or any possible implementation manner of the first aspect.

In a third aspect, a communication device is provided. The communication device may be a network device in the above method design, or a chip provided in the network device. The communication apparatus includes: a processor, coupled to a memory, and configured to execute instructions in the memory to implement the method performed by the network device in the first aspect and any possible implementation manner thereof. Optionally, the communication device further includes a memory. Optionally, the communication device further includes a communication interface, and the processor is coupled to the communication interface.

When the communication device is a network device, the communication interface may be a transceiver or an input / output interface.

When the communication device is a chip provided in a network device, the communication interface may be an input / output interface.

Alternatively, the transceiver may be a transceiver circuit. Alternatively, the input / output interface may be an input / output circuit.

According to a fourth aspect, a program is provided, which when executed by a processor, is used to execute any method in the first aspect and its possible implementation manners.

According to a fifth aspect, a program product is provided, the program product comprising: program code, when the program code is run by a transceiver unit, processing unit or transceiver, or processor of a communication device (eg, a network device), such that The communication device performs any of the methods of the first aspect and its possible implementations.

In a sixth aspect, a computer-readable storage medium is provided, the computer-readable storage medium stores a program that causes a communication device (eg, a network device) to perform the above-described first aspect and possible implementations thereof Either way.

BRIEF DESCRIPTION

FIG. 1 is a schematic diagram of a system architecture according to an embodiment of this application.

FIG. 2 is a mapping pattern of PRS sequences in one RB in the conventional method.

FIG. 3 is a schematic flowchart of a method for transmitting a reference signal provided by an embodiment of this application.

FIG. 4 is a mapping pattern of a PRS sequence provided in an embodiment of this application in an RB.

FIG. 5 is another mapping pattern of PRS sequences provided in an embodiment of this application in one RB.

FIG. 6 is another mapping pattern of the PRS sequence provided in the embodiment of this application in one RB.

FIG. 7 is another mapping pattern of the PRS sequence provided in the embodiment of this application in one RB.

FIG. 8 is another mapping pattern of the PRS sequence provided in the embodiment of this application in one RB.

FIG. 9 is another mapping pattern of the PRS sequence provided in an embodiment of this application in one RB.

FIG. 10 is another mapping pattern of PRS sequences provided in an embodiment of the present application in one RB.

FIG. 11 is another mapping pattern of the PRS sequence provided in an embodiment of this application in one RB.

FIG. 12 is another mapping pattern of the PRS sequence provided in the embodiment of this application in one RB.

FIG. 13 is another mapping pattern of the PRS sequence provided in the embodiment of this application in one RB.

14 is a schematic block diagram of an apparatus for transmitting reference signals according to an embodiment of the present application.

15 is a schematic structural diagram of an apparatus for transmitting reference signals according to an embodiment of the present application.

detailed description

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

The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: global mobile communication (global system for mobile communications, GSM) system, code division multiple access (code division multiple access (CDMA) system, broadband code division multiple access) (wideband code division multiple access (WCDMA) system, general packet radio service (general packet radio service, GPRS), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE Time division duplex (time division duplex, TDD), universal mobile communication system (universal mobile telecommunication system, UMTS), global interconnected microwave access (worldwide interoperability for microwave access, WiMAX) communication system, future fifth-generation mobile communication system ( 5th generation mobile networks or 5th generation wireless systems (5G) or new radio (NR), etc.

The user equipment (UE) in the embodiments of the present application may refer to user equipment, access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless Communication equipment, user agent or user device. The UE can also be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), and a wireless communication function Handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, UEs in future 5G networks or UEs in future public land mobile communication networks (PLMN), etc. This is not limited in the embodiments of the present application.

The network device in the embodiment of the present application may be a device for communicating with a UE, and the network device may be a global mobile communication (global system for mobile communications, GSM) system or code division multiple access (code division multiple access, CDMA). The base transceiver station (BTS) can also be a base station (NodeB, NB) in a wideband code division multiple access (WCDMA) system, or an evolved base station (evolved NodeB in an LTE system) , ENB or eNodeB), or a wireless controller in a cloud radio access network (CRAN) scenario, or the network device can be a relay station, an access point, an in-vehicle device, a wearable device, and future 5G The network devices in the network or the network devices in the PLMN network that will evolve in the future are not limited in the embodiments of the present application.

In the embodiment of the present application, the UE or the network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. The hardware layer includes central processing unit (CPU), memory management unit (memory management unit, MMU), and memory (also called main memory) and other hardware. The operating system may be any one or more computer operating systems that implement business processes through processes, for example, a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a windows operating system. The application layer includes browser, address book, word processing software, instant messaging software and other applications. Moreover, the embodiment of the present application does not specifically limit the specific structure of the execution body of the method provided in the embodiment of the present application, as long as it can run the program that records the code of the method provided by the embodiment of the present application to provide according to the embodiment of the present application The method may be used for communication. For example, the execution body of the method provided in the embodiments of the present application may be a UE or a network device, or a functional module in the UE or a network device that can call a program and execute the program.

FIG. 1 is a schematic diagram of an application scenario according to an embodiment of the present application. In the wireless communication system shown in FIG. 1, the communication system 100 includes a network device 102, and the network device 102 may include one antenna or multiple antennas, for example,

antennas

104, 106, 108, 110, 112, and 114. In addition, the network device 102 may additionally include a transmitter chain and a receiver chain. Those of ordinary skill in the art will understand that they can all include multiple components related to signal transmission and reception (such as processors, modulators, and multiplexers) , Demodulator, demultiplexer or antenna, etc.).

The network device 102 can communicate with multiple UEs (eg, UE 116 and UE 122). However, it is understood that the network device 102 can communicate with any number of UEs similar to the UE 116 or the UE 122. The

UEs

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

As shown in FIG. 1, UE 116 communicates with

antennas

112 and 114, where

antennas

112 and 114 send information to UE 116 through a forward link (also known as a downlink) 118 and a reverse link (also known as an uplink) Way) 120 receives information from the UE 116. In addition, UE 122 communicates with

antennas

104 and 106, where

antennas

104 and 106 send information to UE 122 through forward link 124 and receive information from UE 122 through reverse link 126.

For example, in a frequency division duplex (FDD) system, for example, the forward link 118 may use a different frequency band from the reverse link 120, and the forward link 124 may use a different frequency band from the 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, the forward link 124 and the reverse link The link 126 may use a common frequency band.

Each antenna (or antenna group consisting of multiple antennas) and / or area designed for communication is called a sector of the network device 102. For example, the antenna group may be designed to communicate with UEs in sectors in the coverage area of the network device 102. The network device may send signals to all UEs in its corresponding sector through single antenna or multi-antenna transmit diversity. In the process of the network device 102 communicating with the

UEs

116 and 122 via the forward links 118 and 124, respectively, the transmit antenna of the network device 102 may also use beamforming to improve the signal-to-noise ratio of the forward links 118 and 124. In addition, when the network device 102 uses beamforming to transmit signals to randomly distributed

UEs

116 and 122 in the relevant coverage area, when the network device 102 uses beamforming to transmit signals to all its UEs, the neighboring cells Mobile devices in will experience less interference.

At a given time, the network device 102, the UE 116, or the UE 122 may be a wireless communication transmitting device and / or a wireless communication receiving device. 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 to the wireless communication receiving device through the channel. Such data bits may be contained in a transport block (or multiple transport blocks) of data, which may be segmented to produce multiple code blocks.

In addition, the communication system 100 may be a PLMN network, a D2D network, an M2M network, or other networks. FIG. 1 is only a simplified schematic diagram of an example, and the network may include other network devices, which are not shown in FIG.

First, a brief introduction to the traditional method of transmitting PRS.

FIG. 2 shows a mapping pattern of PRSs carried in a resource block (resource, block, RB). In addition, the CRS is also carried in the RB, and the CRS mapping pattern in the RB is shown in FIG. 2.

However, the CRS is currently weakened in the NR system, and the resources originally used to transmit CRS may be idle. For example, the symbol with index number 4 (symbol # 4), symbol # 7 and symbol # 11 in Figure 2 are in The NR system is not used to transmit CRS, which is in an idle state, which is not conducive to the effective use of transmission resources, and is also not conducive to the use of positioning reference signals to achieve more accurate positioning measurement.

In view of this, embodiments of the present application provide a method for transmitting PRS, by carrying PRS in a RB carrying multiple control symbols (for example, physical downlink control channel (PDCCH)) On consecutive symbols, the symbol carrying the control signal in one RB is followed by PRS on all consecutive symbols, so as to realize the effective use of transmission resources. And the method for transmitting reference signals provided by the present application can make the mapped PRS The cross-correlation coefficient between sequences is low (for example, the cross-correlation coefficient between PRS sequences can be kept below 0.06), thereby enabling more accurate positioning.

The above description can be replaced by: The embodiment of the present application provides a method for transmitting PRS, by carrying the PRS in a RB after carrying the symbol of the control signal (for example, physical downlink control channel (physical downlink control channel, PDCCH) On multiple consecutive symbols, a symbol carrying a control signal in one RB is followed by a PRS on consecutive symbols, so as to realize flexible utilization of transmission resources. And the method for transmitting reference signals provided by the present application can enable the mapped PRS The cross-correlation coefficient between sequences is low (for example, the cross-correlation coefficient between PRS sequences can be kept below 0.06), thereby enabling more accurate positioning.

FIG. 3 is a schematic flowchart of a method 200 for transmitting a reference signal according to an embodiment of the present application. The UE described in FIG. 3 may be the UE 116 or UE 122 in FIG. 1; the network device may be the network device 102 in FIG. Of course, in an actual system, the number of network devices and UEs may not be limited to examples in this embodiment or other embodiments, and details are not described below. The method 200 includes at least the following steps.

S201. Generate a positioning reference signal PRS sequence.

S202. Map the PRS sequence to the target symbol in the target time slot. The target symbol includes multiple consecutive symbols after the symbol carrying the control signal in the target time slot. The length of the PRS sequence is

Is the total number of resource blocks RB allocated for downlink transmission, and N _RE is the number of target resource elements RE carrying PRS on one target symbol in each RB.

In one implementation, specifically, before sending the PRS sequence to the UE, the network device first generates a PRS sequence, and the length of the PRS sequence generated by the network device is

Is the total number of resource blocks RB allocated by the network device for downlink transmission, and N _RE is the number of target resource element REs carrying PRS on a target symbol in each RB, where the RB allocated by the network device to the UE The number of RBs that can carry PRS is recorded as

For example, the total number of RBs allocated by the network device for downlink transmission is

Among the 100 RBs

RBs can carry PRSs, and the number of REs (eg, target REs) carrying PRSs on one symbol (eg, target symbol) for carrying PRSs in each RB is 2 (N _RE = 2).

It should be understood that this is only an example, and it may also be that among 100 RBs, one RE is selected from every 4 RBs to carry the PRS sequence. This application does not limit the specifics.

Taking the above assumption as an example, the network device generates a PRS sequence of length 200, selects a PRS sequence of length 120 from the PRS sequence of length 200, and maps a PRS sequence of length 120 to 120 on a target symbol RE on. In another implementation manner, specifically, the network device first generates a PRS sequence before sending the PRS sequence to the UE, and the length of the PRS sequence generated by the network device is

N _RE is the number of target resource element REs carrying PRSs on a target symbol in each RB, and the number of RBs that can carry PRSs in the RBs allocated by the network device to the UE is recorded as

Among the 100 RBs

Taking the above assumption as an example, the network device generates a PRS sequence of length 120, and maps the PRS sequence of length 120 to 120 REs on a target symbol.

It should be noted that the above description is based on the example in which the network device generates a PRS sequence and maps the generated PRS sequence to a target RE on a target symbol. In fact, when the target symbol is in the time slot (for example , Target time slot) includes multiple target symbols that can map PRS, for example, the target time slot includes 11 target symbols that can map PRS, then the network device can generate 11 PRS sequences, the The PRS is sequentially mapped to target REs on 11 target symbols, and each PRS sequence occupies 120 REs. For the method in which the network device generates the 11 PRS sequences, and the method of sequentially mapping the PRSs in the generated 11 sequences to the target REs on the 11 target symbols, please refer to the related descriptions above.

It should be understood that the same PRS sequence may also be placed on different target symbols, that is, one PRS sequence is repeatedly transmitted on different target symbols. In another implementation, the same PRS sequence can also be mapped to REs on different target symbols. This application does not limit the specific mapping method of the PRS sequence to the symbol. The following takes a PRS sequence mapped to a target symbol as an example, and different target symbols carry different PRS as an example, which will not be described in detail, but it should not be understood that the following embodiments limit the mapping method of the PRS sequence to the target symbol.

S203. Send a PRS sequence to the UE on the target RE.

Specifically, after the mapping of the generated PRS sequence to the target RE by the network device is completed, the network device sends the PRS sequence to the UE.

Taking the mapping of the generated PRS sequence in one RB as an example, a specific implementation manner in which the network device maps the generated PRS sequence to the target RE will be described in detail.

Way 1

In one implementation, mapping the PRS sequence to the target symbol in the target time slot includes:

Is the number of RBs used to carry PRS.

V _shift in equation (1) represents the offset in the frequency domain, v _shift is an integer greater than or equal to 0, and can be expressed as:

Where, C ₁ is a constant, and exemplarily, its value may be at least 0, ₁ , 2, 3, 4, or 5.

Specifically, the network device first generates a PRS sequence. The PRS sequence may be a Golden sequence, a Zadeoff-Chu sequence, or other random sequences, which are not specifically limited in the embodiments of the present application.

For example, the PRS sequence may be generated by a root sequence factor, and the root sequence factor may be expressed as:

among them,

Stands for PRS ID, or stands for other IDs defined by the upper layer (for example, cell ID or transmission and reception point (TRP) ID, etc.), n _s stands for the index value of the target time slot, l stands for the index of the target symbol Value, N _CP is a cyclic prefix (CP) flag. When N _CP = 1, it means normal CP (normal CP). At this time, there are 14 symbols in a time slot. When N _CP = 0, it means extension. CP (extended CP), this time includes 12 symbols in a time slot.

For example, when N _CP = 1,

When N _RE = 2, l = 3, 4, ..., 13, the network device sequentially generates 11 PRS sequences of length 200 according to equation (3), and selects a length of 120 from each PRS sequence. In the PRS sequence, the values in the 11 sets of PRS sequences are sequentially mapped to the target REs on the corresponding target symbols according to equation (1).

Where m 'in equation (1) is the corresponding index value of the value mapped on the target RE in the PRS sequence of length 200, and m is the corresponding index value of the value mapped on the target RE in the length of 120PRS sequence .

When l, m ', m,

When the values of v _shift are all determined, the network device may determine the frequency domain position k of the corresponding target RE after the value of the index value m 'is mapped according to equation (1), and the network device determines the values of l and k , Map the value of index value m 'to the target RE indicated by l and k.

Fig. 4 shows the mapping pattern of the mapped PRS sequence in one RB according to equation (1) when N _CP = 1, and it can be seen that on each target symbol in symbol # 3 ～ symbol # 13 Both target REs carry the values in the PRS sequence, where the two values mapped on a target symbol are separated by 6 REs.

It can also be seen from FIG. 4 that, in the embodiment of the present application, symbol # 0 to symbol # 2 in the target time slot may be used to carry control signals (for example, PDCCH).

In another implementation, mapping the PRS sequence to the target symbol in the target time slot includes:

Where l is the index value of the target symbol where the corresponding target RE is mapped after the value with index value m 'is mapped, and the value range of l is [ls, ls + lprs-1], where lprs is the symbol length carrying PRS , The value range is [1,11], ls is the starting symbol index, the value range is [3,14-lprs], k is the frequency domain position of the corresponding target RE after the value of the index value m 'is mapped ,

Is the number of RBs used to carry PRS.

The v _shift in equation (1 ′) represents the offset in the frequency domain, and v _shift is an integer greater than or equal to 0, which can be expressed as equation (2).

For example, the PRS sequence may be generated by a root sequence factor, and the root sequence factor may be expressed as formula (3).

In equation (3),

For example, when N _CP = 1,

When N _RE = 2, l = 3,4, ..., 13, the network device sequentially generates 11 PRS sequences of length 120 according to equation (3), and according to equation (1 '), the 11 sets of PRS sequences The value of in turn maps to the target RE on the corresponding target symbol.

Wherein, m 'in formula (1') is an index value mapped to the relative starting frequency of the relative downlink bandwidth of the target RE, and m is a corresponding index value of the value mapped on the target RE in a PRS sequence of length 120.

When l, m ', m,

When the values of v _shift are all determined, the network device can determine the frequency domain position k of the corresponding target RE after the value of the index value m 'is mapped according to equation (1'), and the network device can determine the values of l and k Value, map the value of index value m 'to the target RE indicated by l and k.

Fig. 4 shows the mapping pattern of the mapped PRS sequence in one RB according to equation (1 ') when N _CP = 1, and it can be seen that each target symbol in symbol # 3 ～ symbol # 13 There are two target REs carrying the values in the PRS sequence, where the two values mapped on a target symbol are separated by 6 REs.

Way 2

For the number of RBs used to carry PRS, v _shift represents the offset in the frequency domain, v _shift is an integer greater than or equal to 0, and can be expressed as equation (2).

Specifically, for example, when N _CP = 1,

When N _RE = 2, l = 3, 4, ..., 13, the network device sequentially generates 11 PRS sequences of length 160 according to equation (2), and selects lengths of 80 from each PRS sequence. In the PRS sequence, the values in the 11 groups of PRS sequences are sequentially mapped to the target REs on the corresponding target symbols according to equation (4).

Among them, for symbol # 3 ～ symbol # 6 in the target time slot, according to the formula (4)

Map the values in the PRS sequence. For symbol # 7 to symbol # 14 in the target time slot, follow the equation (4)

Map the values in the sequence.

M 'in equation (4) is the corresponding index value of the value mapped on the target RE in the PRS sequence of length 120, and m is the corresponding index value of the value mapped on the target RE in the PRS sequence of length 80 .

When l, m ', m,

When the values of v _shift are all determined, the network device may determine the frequency domain position k of the corresponding target RE after the value of the index value m 'is mapped according to equation (4), and the network device may determine the values of , Map the value of index value m 'to the target RE indicated by l and k.

Fig. 5 shows the mapping pattern of the mapped PRS sequence in one RB according to equation (4) when N _CP = 1, and it can be seen that on each target symbol in symbol # 3 ～ symbol # 13 Both target REs carry the values in the PRS sequence, where the two values mapped on a target symbol are separated by 6 REs.

It can also be seen from FIG. 5 that, in the embodiment of the present application, symbol # 0 to symbol # 2 in the target time slot can be used to carry control signals (for example, PDCCH).

It should be noted that, for the method for the network device to generate the PRS sequence, please refer to the relevant description in Mode 1, and for the sake of brevity, it will not be repeated here.

Based on formula (4), the value of the index value m 'in the PRS sequence is mapped to the target RE on the target symbol:

Specifically, for example, when N _CP = 1,

When N _RE = 2, l = 3,4, ..., 13, the network device sequentially generates 11 PRS sequences with a length of 80 according to equation (2), and according to equation (4), among the 11 sets of PRS sequences The values are sequentially mapped to the target REs on the corresponding target symbols.

Map the values in the sequence.

M 'in equation (4) is the corresponding index value of the value mapped on the target RE in the PRS sequence of length 120, and m is the index value mapped on the relative frequency of the target RE relative to the starting frequency.

When l, m ', m,

When the values of v _shift are all determined, the network device can determine the frequency domain position k of the corresponding target RE after the value of the index value m 'is mapped according to equation (4), and the network device determines the values of l and k , Map the value of index value m 'to the target RE indicated by l and k.

Way 3

Specifically, for example, when N _CP = 0,

When N _RE = 2, l = 3,4, ..., 11, the network device sequentially generates 9 PRS sequences of length 180 according to equation (2), and selects a length of 120 from each PRS sequence In the PRS sequence, the values in the 9 groups of PRS sequences are sequentially mapped to the target REs on the corresponding target symbols according to equation (5).

Where m 'in equation (5) is the corresponding index value of the value mapped on the target RE in the PRS sequence of length 180, and m is the value of the value mapped on the target RE in the PRS sequence of length 120 Index value.

When l, m ', m,

When the values of v _shift are all determined, the network device can determine the frequency domain position k of the corresponding target RE after the value of the index value m 'is mapped according to equation (5), and the network device can determine , Map the value of index value m 'to the target RE indicated by l and k.

Fig. 6 shows the mapping pattern of the mapped PRS sequence in one RB according to equation (5) when N _CP = 0, it can be seen that on each target symbol in symbol # 3 ～ symbol # 11 Both target REs carry the values in the PRS sequence, where the two values mapped on a target symbol are separated by 6 REs.

It can also be seen from FIG. 6 that, in the embodiment of the present application, symbol # 0 to symbol # 2 in the target time slot may be used to carry control signals (for example, PDCCH).

Where l is the index value of the target symbol where the corresponding target RE is mapped after the value with index value m 'is mapped, and the value range of l is [ls, ls + lprs-1], where lprs is the symbol length carrying PRS , The value range is [1,9], ls is the starting symbol index, the value range is [3,12-lprs], k is the frequency domain position of the corresponding target RE after the value with index value m 'is mapped ,

Specifically, for example, when N _CP = 0,

When N _RE = 2, l = 3,4, ..., 11, the network device sequentially generates 9 PRS sequences of length 120 according to equation (2), and according to equation (5 '), the 9 sets of PRS sequences The value of in turn maps to the target RE on the corresponding target symbol.

Where m 'in equation (5') is the corresponding index value of the value mapped on the target RE in the PRS sequence of length 180, and m is the value of the value mapped on the target RE in the PRS sequence of length 120 The index value of.

When l, m ', m,

When the values of v _shift are all determined, the network device may determine the frequency domain position k of the corresponding target RE after the value of the index value m 'is mapped according to equation (5'), and the network device may determine Value, map the value of index value m 'to the target RE indicated by l and k.

Fig. 6 shows the mapping pattern of the mapped PRS sequence in one RB according to equation (5 ') when N _CP = 0, it can be seen that each target symbol in symbol # 3 ～ symbol # 11 There are two target REs carrying the values in the PRS sequence, where the two values mapped on a target symbol are separated by 6 REs.

It should also be noted that the mapping patterns of the PRS given in the above manners 1 to 3 are only exemplary illustrations, and do not constitute any limitation on the embodiments of the present application. Any mapping of the PRS after the symbol carrying the control signal The schemes on each consecutive symbol fall within the protection scope of this application.

In addition to the ways 1 to 3 of mapping PRS provided above, embodiments of the present application provide several other ways of mapping PRS, which will be described in detail below.

Way 4

Map the PRS sequence to the target symbol in the target time slot, including:

Is the number of RBs used to carry PRS.

In equation (6), k _{1, init} , k _{2, and init} represent the offset in the frequency domain, and k _{1, init} , and k _{2, init} are all greater than or equal to 0 and less than or equal to (12 / N _RE -1) integer, f _shift represents the offset in the time domain, f _{shift is} greater than or equal to 0 integer, can be expressed as:

Specifically, the network device generates a PRS sequence, and when mapping the PRS in the target time slot, selects two target symbols in the target time slot, and compares the value in the PRS sequence on the target RE on the selected two target symbols For mapping.

A target device on the network can be symbol mapped in one RB value in the sequence number N _RE, N _RE values may be 1,2,3,4,6 or 12.

For example, when N _CP = 1,

When N _RE = 6, l = 3, 4, ..., 13, the network device sequentially generates 11 PRS sequences of length 300 according to equation (2), and selects lengths of 180 from each PRS sequence In the PRS sequence, the values in the 11 groups of PRS sequences are sequentially mapped to the target REs on the corresponding target symbols according to equation (6).

Where m 'in equation (6) is the corresponding index value of the value mapped on the target RE in the PRS sequence of length 300, and m is the value of the value mapped on the target RE in the PRS sequence of length 180 Index value.

When l, m ', m,

When the values of k _{1, init} , k _{2, init} , and f _shift are all determined, the network device can determine the frequency domain position k of the corresponding target RE after the value of the index value m 'is mapped according to equation (6) Based on the values of l and k, the network device maps the value of index value m 'to the target RE indicated by l and k.

Fig. 7 shows that when N _CP = 1, according to equation (6), the mapping pattern of the PRS sequence after being mapped in one RB can be seen that there are 6 targets in symbol # 4 and symbol # 9. The RE carries the values in the PRS sequence, where any two adjacent values mapped on a target symbol are separated by 1 RE. It can also be seen from Figure 7 that the values of k _{1, init} and k _{2, init} are different, and the difference between the two is 1.

In mode 4, the values of k _{1, init} and k _{2, init} can also be equal. When the values of k _{1, init} and k _{2, init} are equal, if N _RE = 6, according to equation (6), The mapping pattern of the mapped PRS sequence in one RB is shown in FIG. 8.

In mode 4, if N _RE = 12, according to equation (6), the mapping pattern of the mapped PRS sequence in one RB is shown in FIG. 9, at this time, k _{1, init} and k _{2, init} are taken The values may be equal or they may not be equal.

It can also be seen from FIG. 7 to FIG. 9 that, in the embodiment of the present application, symbol # 0 to symbol # 2 in the target time slot may be used to carry control signals (for example, PDCCH).

Way 5

Map the PRS sequence to the target symbol in the target time slot, including:

Is the number of RBs used to carry PRS.

In formula (8), k _{1, init} , k _{2, and init} represent the offset in the frequency domain, and k _{1, init} , and k _{2, init} are all greater than or equal to 0 and less than or equal to (12 / N _RE -1) integer, f _shift represents the offset in the time domain, f _{shift is} greater than or equal to 0 integer, can be expressed as:

Specifically, when the network device generates a PRS sequence and maps the PRS in the target time slot, two target symbols are selected in the target time slot, and the PRS is mapped on the target RE on the selected two target symbols.

The network device may map N _RE PRSs on a target symbol in an RB, and the value of N _RE may be 1, 2, 3, 4, 6, or 12.

For example, when N _CP = 0,

When N _RE = 6, l = 3, 4, ..., 13, the network device sequentially generates 9 PRS sequences of length 240 according to equation (2), and selects a length of 120 from each PRS sequence In the PRS sequence, the values in the 9 groups of PRS sequences are sequentially mapped to the target REs on the corresponding target symbols according to equation (8).

Where m 'in equation (9) is the corresponding index value of the value mapped on the target RE in the PRS sequence of length 240, and m is the value of the value S mapped on the target RE in the PRS sequence of length 120 Index value.

When l, m ', m,

When the values of k _{1, init} , k _{2, init} , and f _shift are all determined, the network device can determine the frequency domain position k of the corresponding target RE after the value of the index value m 'is mapped according to equation (9) Based on the values of l and k, the network device maps the value of index value m 'to the target RE indicated by l and k.

Fig. 10 shows the mapping pattern of the mapped PRS sequence in one RB according to equation (8) when N _CP = 0 and N _RE = 6, and it can be seen that symbol # 4 and symbol # 8 There are 6 target REs carrying the values in the PRS sequence, wherein any two adjacent values mapped on one target symbol are separated by 1 RE. It can also be seen from Figure 10 that k _{1, init} and k _{2, init have} the same value.

FIG. 11 shows the mapping pattern of the mapped PRS sequence in one RB according to equation (8) when N _CP = 0 and N _RE = 12. It can be seen that symbol # 4 and symbol # 8 There are 12 target REs carrying the values in the PRS sequence. At this time, the values of k _{1, init} and k _{2, init} may be equal, or may not be equal.

In mode 5, when N _CP = 1, N _RE = 6, k _{1, init} and k _2, the value of _init is equal, according to equation (8), the mapping pattern of the mapped PRS sequence in one RB As shown in Figure 12.

In mode 5, when N _CP = 1 and N _RE = 12, according to equation (8), the mapping pattern of the mapped PRS sequence in one RB is shown in FIG. 13. At this time, the values of k _{1, init} and k _{2, init} may be equal, or may not be equal.

It can also be seen from FIGS. 10 to 13 that in the embodiment of the present application, symbol # 0 to symbol # 2 in the target time slot can be used to carry control signals (for example, PDCCH).

In Mode 4 and Mode 5, when mapping the PRS sequence, by taking into account the flexible mapping pattern of the demodulation reference signal (DMRS), a comb-shaped mapping pattern that matches the DMRS mapping pattern is used Sequence mapping: select two target symbols in the target time slot, and map the values in the PRS sequence on the target REs on the selected two target symbols, so as to better map the other signals in the NR system On the basis of combination, the effective utilization of transmission resources is realized.

It should also be noted that the mapping patterns of the PRSs given in the above ways 4 to 5 are only exemplary descriptions, and do not constitute any limitation on the embodiments of the present application. Any mapping of the PRS after the symbol carrying the control signal The schemes on the symbols with intervals in the time domain all fall within the protection scope of the present application.

It should also be noted that, in the embodiment of the present application, when mapping the PRS sequence, different cells may be distinguished by the time domain offset between target REs on any two target symbols carrying the PRS sequence, or , The frequency domain offset between the target REs on any two target symbols carrying the PRS sequence can be used to distinguish different cells.

For example, when the time domain offset between target REs on two target symbols carrying PRS sequences is 1, it means that the PRS sequences carried on the two target symbols come from different cells. When the frequency domain offset between the target REs on the two target symbols carrying the PRS sequence is 1, it means that the PRS sequences carried on the two target symbols come from different cells.

It should also be noted that in various embodiments of the present application, the size of the sequence numbers of the above processes does not mean the order of execution order, and the execution order of each process should be determined by its function and inherent logic, and should not be The implementation process of the application examples constitutes no limitation.

The method for transmitting the reference signal according to the embodiment of the present application is described in detail above with reference to FIGS. 1 to 13. The apparatus for transmitting reference signals according to an embodiment of the present application will be described below with reference to FIGS. 14 and 15. It should be understood that the technical features described in the method embodiments are also applicable to the following device embodiments.

FIG. 14 shows a schematic block diagram of an apparatus 300 for transmitting reference signals according to an embodiment of the present application. The apparatus 300 is used to execute the method performed by the network device in the foregoing method embodiment. Optionally, the specific form of the apparatus 300 may be a chip in a network device. This embodiment of the present application does not limit this. The device 300 includes:

The processing module 301 is used to generate a positioning reference signal PRS sequence;

The processing module 301 is further configured to: map the PRS sequence to a target symbol in a target time slot, the target symbol includes a plurality of consecutive symbols after the symbol carrying the control signal in the target time slot, wherein, The length of the PRS sequence is

Is the total number of resource blocks RB allocated for downlink transmission, and N _RE is the number of target resource element REs carrying PRS on one target symbol in each RB;

The transceiver module 302 is configured to send a PRS sequence to the user equipment UE on the target RE.

Optionally, the processing module 301 is also used to:

For the number of RBs used to carry the PRS, v _shift represents the offset in the frequency domain, and v _shift is an integer greater than or equal to 0. Optionally, the processing module 301 is also used to:

Optionally, the processing module 301 is also used to:

For the number of RBs used to carry the PRS, v _shift represents the offset in the frequency domain, and v _shift is an integer greater than or equal to 0. Optionally, the v _shift satisfies the following formula:

among them,

For the PRS identification, C ₁ is a constant.

Optionally, the processing module 301 is also used to:

Alternatively, f _shift can be expressed as:

Optionally, the processing module 301 is also used to:

Alternatively, f _shift can be expressed as:

It should be understood that the apparatus for transmitting reference signals according to the embodiments of the present application may correspond to the method of the network device in the foregoing method embodiments, for example, the method in FIG. 2, and the above and other management operations of each module in the apparatus 300 and / or Or the functions are respectively to realize the corresponding steps of the method of the network device in the foregoing method embodiments, so the beneficial effects in the foregoing method embodiments can also be achieved.

It should also be understood that each module in the device 300 may be implemented in the form of software and / or hardware, which is not specifically limited. In other words, the device 300 is presented in the form of functional modules. The “module” here may refer to an application-specific integrated circuit ASIC, a circuit, a processor and memory that execute one or more software or firmware programs, an integrated logic circuit, and / or other devices that can provide the above-mentioned functions. Alternatively, in a simple embodiment, those skilled in the art may think that the device 300 may take the form shown in FIG. 15. The processing module 301 can be implemented by the processor 401 and the memory 402 shown in FIG. 15. The transceiver module 302 can be implemented by the transceiver 403 shown in FIG. 15. Specifically, the processor is implemented by executing the computer program stored in the memory. Optionally, when the device 300 is a chip, the function and / or implementation process of the transceiver module 302 may also be implemented through pins or circuits. Optionally, the memory is a storage unit within the chip, such as a register, a cache, etc. The storage unit may also be a storage unit located outside the chip within the computer device, as shown in Memory 402.

FIG. 15 shows a schematic structural diagram of an apparatus 400 for transmitting reference signals according to an embodiment of the present application. As shown in FIG. 15, the device 400 includes: a processor 401.

In a possible implementation manner, the processor 401 is configured to: generate a positioning reference signal PRS sequence; map the PRS sequence to a target symbol in a target time slot, the target symbol including the bearer in the target time slot Multiple consecutive symbols after the symbol with the control signal, where the length of the PRS sequence is

The processor 401 is further configured to call an interface to perform the following actions: send a PRS sequence to the user equipment UE on the target RE.

Optionally, the processor 401 is also used to:

Alternatively, f _shift can be expressed as:

Optionally, the processor 401 is also used to:

Alternatively, f _shift can be expressed as:

It should be understood that the processor 401 may call an interface to perform the foregoing sending action, where the called interface may be a logical interface or a physical interface, which is not limited in this embodiment of the present application. Alternatively, the physical interface may be implemented by a transceiver. Optionally, the device 400 may further include a transceiver 403.

Optionally, the device 400 further includes a memory 402, and the memory 402 may store the program code in the foregoing method embodiment, so that the processor 401 can call it.

Specifically, if the device 400 includes a processor 401, a memory 402, and a transceiver 403, the processor 401, the memory 402, and the transceiver 403 communicate with each other through an internal connection channel to transfer control and / or data signals. In a possible design, the processor 401, the memory 402, and the transceiver 403 may be implemented by a chip, and the processor 401, the memory 402, and the transceiver 403 may be implemented on the same chip, or may be implemented on different chips, respectively. Or any two of them can be combined in one chip. The memory 402 may store program codes, and the processor 401 calls the program codes stored in the memory 402 to implement the corresponding functions of the device 400.

It should be understood that the apparatus 400 may also be used to perform other steps and / or operations on the network device side in the foregoing embodiments, and for brevity, details are not described here.

It should be understood that the foregoing processor may be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), or a field programmable gate array (FPGA) Or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, can also be a system chip (system on chip, SoC), can also be a central processor (central processor (unit), CPU, or network processing Network (processor), can also be a digital signal processing circuit (digital signal processor, DSP), can also be a microcontroller (microcontroller unit, MCU), can also be a programmable controller (programmable logic (device, PLD ) Or other integrated chips. The methods, steps, and logical block diagrams disclosed in the embodiments of the present application may be implemented or executed. The 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 and executed by a hardware decoding processor, or may be executed and completed by a combination of hardware and software modules in the decoding processor. The software module may be located in a mature storage medium in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, and registers. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

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

It should be noted that when the processor is a general-purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component, the memory (storage module) is integrated in the processor.

It should be noted that the memories described herein are intended to include, but are not limited to these and any other suitable types of memories.

Those of ordinary skill in the art may realize that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in hardware or software depends on the specific application of the technical solution and design constraints. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that for the convenience and conciseness of the description, the specific working process of the system, device and unit described above can refer to the corresponding process 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, device, and method may be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a division of logical functions. In actual implementation, there may be other divisions, 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. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of 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 alone physically, or two or more units may be integrated into one unit.

If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present application essentially or part of the contribution to the existing technology or part of the technical solution can be embodied in the form of a software product, the computer software product is stored in a storage medium, including Several instructions are used to enable a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM), random access memory (random access memory, RAM), magnetic disk or optical disk and other media that can store program codes .

The above is only the specific implementation of this application, but the scope of protection of this application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in this application. It should be covered by the scope of protection of this application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

A method for transmitting a reference signal, characterized in that the method is performed by a network device and includes:

Generate a positioning reference signal PRS sequence;

Mapping the PRS sequence to a target symbol in a target time slot, the target symbol including a plurality of consecutive symbols after the symbol carrying the control signal in the target time slot, wherein the length of the PRS sequence is
Is the total number of resource blocks RB allocated for downlink transmission, and N RE is the number of target resource element REs carrying PRS on one target symbol in each RB;

Sending a PRS sequence to the user equipment UE on the target RE.
The method according to claim 1, wherein mapping the PRS sequence to the target symbol in the target time slot includes:

The value of the index value m 'in the PRS sequence is mapped to the target RE on the target symbol based on the following formula:

Where l is the index value of the target symbol where the corresponding target RE is mapped after the value with the index value m is mapped, and k is the frequency domain position of the target RE after the value with the index value m is mapped,
For the number of RBs used to carry the PRS, v shift represents the offset in the frequency domain, and v shift is an integer greater than or equal to 0.
The method according to claim 1, wherein mapping the PRS sequence to the target symbol in the target time slot includes:

The value of the index value m 'in the PRS sequence is mapped to the target RE on the target symbol based on the following formula:

Among them, l is the index value of the target symbol where the corresponding target RE is mapped after the value of the index value m is mapped. The value range is [1,11], ls is the starting symbol index, the value range is [3,14-lprs], k is the frequency domain position of the corresponding target RE after the value with the index value m is mapped,
For the number of RBs used to carry the PRS, v shift represents the offset in the frequency domain, and v shift is an integer greater than or equal to 0.
The method according to claim 1, wherein mapping the PRS sequence to the target symbol in the target time slot includes:

The value of the index value m 'in the PRS sequence is mapped to the target RE on the target symbol based on the following formula:

Where l is the index value of the target symbol where the corresponding target RE is mapped after the value with the index value m is mapped, and k is the frequency domain position of the target RE after the value with the index value m is mapped,
For the number of RBs used to carry the PRS, v shift represents the offset in the frequency domain, and v shift is an integer greater than or equal to 0.
The method according to claim 1, wherein mapping the PRS sequence to the target symbol in the target time slot includes:

The value of the index value m 'in the PRS sequence is mapped to the target RE on the target symbol based on the following formula:

Where l is the index value of the target symbol where the corresponding target RE is mapped after the value with the index value m is mapped, and k is the frequency domain position of the target RE after the value with the index value m is mapped,
For the number of RBs used to carry the PRS, v shift represents the offset in the frequency domain, and v shift is an integer greater than or equal to 0.
The method according to claim 1, wherein mapping the PRS sequence to the target symbol in the target time slot includes:

The value of the index value m 'in the PRS sequence is mapped to the target RE on the target symbol based on the following formula:

Where l is the index value of the target symbol where the corresponding target RE is mapped after the value with the index value m is mapped, and the value range of l is [ls, ls + lprs-1], where lprs is the symbol length carrying the PRS, The value range is [1,9], ls is the starting symbol index, the value range is [3,12-lprs], k is the frequency domain position of the corresponding target RE after the value of the index value m is mapped,
For the number of RBs used to carry the PRS, v shift represents the offset in the frequency domain, and v shift is an integer greater than or equal to 0.
The method according to any one of claims 2 to 6, wherein the v shift satisfies the following formula:

among them,
For the PRS identification, C 1 is a constant.
An apparatus for transmitting reference signals, which is characterized by comprising:

The processing module is used to generate a positioning reference signal PRS sequence;

The processing module is further configured to: map the PRS sequence to a target symbol in a target time slot, the target symbol includes a plurality of consecutive symbols after the symbol carrying the control signal in the target time slot, wherein, PRS The length of the sequence is
Is the total number of resource blocks RB allocated for downlink transmission, and N RE is the number of target resource element REs carrying PRS on one target symbol in each RB;

The transceiver module is configured to send a PRS sequence to the user equipment UE on the target RE.
The apparatus according to claim 8, wherein the processing module is further configured to:

The value of the index value m 'in the PRS sequence is mapped to the target RE on the target symbol based on the following formula:

Where l is the index value of the target symbol where the corresponding target RE is mapped after the value with the index value m is mapped, and k is the frequency domain position of the target RE after the value with the index value m is mapped,
For the number of RBs used to carry the PRS, v shift represents the offset in the frequency domain, and v shift is an integer greater than or equal to 0.
The apparatus according to claim 8, wherein the processing module is further configured to:

The value of the index value m 'in the PRS sequence is mapped to the target RE on the target symbol based on the following formula:

Where l is the index value of the target symbol where the corresponding target RE is mapped after the value with the index value m is mapped, and the value range of l is [ls, ls + lprs-1], lprs is the symbol length carrying the PRS, The value range is [1,11], ls is the starting symbol index, the value range is [3,14-lprs], k is the frequency domain position of the corresponding target RE after the value with the index value m is mapped,
For the number of RBs used to carry the PRS, v shift represents the offset in the frequency domain, and v shift is an integer greater than or equal to 0.
The apparatus according to claim 8, wherein the processing module is further configured to:

The value of the index value m 'in the PRS sequence is mapped to the target RE on the target symbol based on the following formula:

Where l is the index value of the target symbol where the corresponding target RE is mapped after the value with the index value m is mapped, and k is the frequency domain position of the target RE after the value with the index value m is mapped,
For the number of RBs used to carry the PRS, v shift represents the offset in the frequency domain, and v shift is an integer greater than or equal to 0.
The apparatus according to claim 8, wherein the processing module is further configured to:

The value of the index value m 'in the PRS sequence is mapped to the target RE on the target symbol based on the following formula:

Where l is the index value of the target symbol where the corresponding target RE is mapped after the value with the index value m is mapped, and k is the frequency domain position of the target RE after the value with the index value m is mapped,
For the number of RBs used to carry the PRS, v shift represents the offset in the frequency domain, and v shift is an integer greater than or equal to 0.
The apparatus according to claim 8, wherein the processing module is further configured to:

The value of the index value m 'in the PRS sequence is mapped to the target RE on the target symbol based on the following formula:

Where l is the index value of the target symbol where the corresponding target RE is mapped after the value with the index value m is mapped, and the value range of l is [ls, ls + lprs-1], where lprs is the symbol length carrying the PRS, The value range is [1,9], ls is the starting symbol index, the value range is [3,12-lprs], k is the frequency domain position of the corresponding target RE after the value of the index value m is mapped,
For the number of RBs used to carry the PRS, v shift represents the offset in the frequency domain, and v shift is an integer greater than or equal to 0.
The device according to any one of claims 9 to 13, wherein the v shift satisfies the following formula:

among them,
For the PRS identification, C 1 is a constant.