WO2023164948A1

WO2023164948A1 - Wireless communication method and terminal device

Info

Publication number: WO2023164948A1
Application number: PCT/CN2022/079408
Authority: WO
Inventors: 赵振山; 马腾; 张世昌
Original assignee: Oppo广东移动通信有限公司
Priority date: 2022-03-04
Filing date: 2022-03-04
Publication date: 2023-09-07

Abstract

Embodiments of the present application provide a wireless communication method and a terminal device. The method comprises: a first terminal device receives a first channel sent by a second terminal device, or sends a first channel to a second terminal device; a first resource block (RB) comprises at least two first demodulation reference signal (DMRS) resource elements (REs); the at least two first DMRS REs comprise at least one of a starting RE and an ending RE of the first RB; the first RB is any RB in a first comb resource, and the first comb resource is a comb resource occupied by the first channel in a frequency domain; the first DMRS RE is used for transmitting a DMRS of the first channel.

Description

A wireless communication method and terminal equipment

technical field

The embodiments of the present application relate to the field of mobile communication technologies, and in particular to a wireless communication method and a terminal device.

Background technique

In a Sidelink (SL) system based on unlicensed spectrum access, in order to allow as many users as possible to access within the same time, a comb-tooth structure is introduced.

For the sidelink transmission system (also called SL-U system) working on the unlicensed spectrum, when the comb structure needs to be supported, how to design the demodulation reference signal (Demodulation Reference Signal, DMRS) structure becomes an urgent technical problem to be solved .

Contents of the invention

Embodiments of the present application provide a wireless communication method and a terminal device.

The wireless communication method provided by the embodiment of this application includes:

The first terminal device receives the first channel sent by the second terminal device, or sends the first channel to the second terminal device, and the first resource block (Resource Block, RB) includes at least two first demodulation reference signal DMRS resource elements (Resource Element, RE), the at least two first DMRS REs include at least one of the start RE and the end RE of the first RB, and the first RB is any RB in the first comb tooth resource, The first comb-tooth resource is a comb-tooth resource occupied by the first channel in the frequency domain, and the first DMRS RE is used to transmit the DMRS of the first channel.

The first terminal device receives the first channel sent by the second terminal device, or sends the first channel to the second terminal device. The first resource block RB includes four first demodulation reference signal DMRS resource elements RE, different from the first frequency The domain intervals are of the same size,

The first frequency domain interval is the frequency domain interval between adjacent first DMRS REs, the first RB is any RB in the first comb-tooth resource, and the first comb-tooth resource is the first The comb tooth resource occupied by the channel in the frequency domain, the first DMRS RE is used to transmit the DMRS of the first channel.

The first terminal device provided in the embodiment of this application includes:

The first transmission module is configured to receive the first channel sent by the second terminal device, or send the first channel to the second terminal device;

The first resource block RB includes at least two first demodulation reference signal DMRS resource element REs, the at least two first DMRS REs include at least one of the start RE and end RE of the first RB, the The first RB is any RB in the first comb-tooth resource, the first comb-tooth resource is the comb-tooth resource occupied by the first channel in the frequency domain, and the first DMRS RE is used to transmit the first Channel DMRS.

The second transmission module is configured to receive the first channel sent by the second terminal device, or send the first channel to the second terminal device;

The first resource block RB includes four first demodulation reference signal DMRS resource elements RE, the size of different first frequency domain intervals is the same, and the first frequency domain interval is the frequency domain between adjacent first DMRS REs interval, the first RB is any RB in the first comb-tooth resource, the first comb-tooth resource is the comb-tooth resource occupied by the first channel in the frequency domain, and the first DMRS RE is used for transmission The DMRS of the first channel.

The terminal device provided in the embodiment of the present application may be the terminal device in the above solution, and the terminal device includes a processor and a memory. The memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory, so that the terminal device executes the above wireless communication method.

The chip provided in the embodiment of the present application is used to implement the above wireless communication method.

Specifically, the chip includes: a processor, configured to call and run a computer program from the memory, so that the device installed with the chip executes the above wireless communication method.

The computer-readable storage medium provided by the embodiment of the present application is used to store a computer program, and the computer program causes the computer to execute the above wireless communication method.

The computer program product provided by the embodiments of the present application includes computer program instructions, where the computer program instructions cause a computer to execute the above wireless communication method.

The computer program provided by the embodiment of the present application, when running on a computer, enables the computer to execute the above wireless communication method.

Through the above technical solution, for an SL-U system that supports a comb-tooth structure, if a DMRS is transmitted in the start RE and/or end RE of an RB, then the DMRS is transmitted in the edge REs of the RB, without using the DMRS of adjacent RBs. Joint channel estimation to improve channel estimation performance.

Description of drawings

The drawings described here are used to provide a further understanding of the application and constitute a part of the application. The schematic embodiments and descriptions of the application are used to explain the application and do not constitute an improper limitation to the application. In the attached picture:

FIG. 1 is a schematic diagram of an application scenario of an embodiment of the present application;

Fig. 2 is a schematic diagram of an optional network structure of side communication provided by the embodiment of the present application;

FIG. 3 is a schematic diagram of an optional network structure for lateral communication provided by an embodiment of the present application;

FIG. 4 is a schematic diagram of an optional network structure for lateral communication provided by an embodiment of the present application;

FIG. 5 is a schematic diagram of an optional network structure for lateral communication provided by an embodiment of the present application;

FIG. 6 is a schematic diagram of an optional network structure of unicast provided by the embodiment of the present application;

FIG. 7 is a schematic diagram of an optional network structure of multicast provided by the embodiment of the present application;

FIG. 8 is a schematic diagram of an optional network structure for broadcasting provided by an embodiment of the present application;

FIG. 9 is a schematic diagram of an optional time slot structure provided by an embodiment of the present application;

FIG. 10 is a schematic diagram of an optional time slot structure provided by an embodiment of the present application;

Fig. 11 is an optional schematic diagram of the time-frequency domain position of the PSCCH DMRS provided by the embodiment of the present application;

Fig. 12 is an optional schematic diagram of the time-frequency domain position of the PSSCH DMRS provided by the embodiment of the present application;

Fig. 13 is an optional schematic diagram of the time-frequency domain position of the PSSCH DMRS provided by the embodiment of the present application;

Fig. 14 is an optional schematic diagram of the PSBCH DMRS time-frequency domain position provided by the embodiment of the present application;

Fig. 15 is an optional schematic diagram of the comb tooth structure provided by the embodiment of the present application;

FIG. 16 is a schematic diagram of an optional structure of a PSCCH/PSSCH frame provided by an embodiment of the present application;

FIG. 17 is an optional schematic diagram of the frequency domain location of the DMRS provided by the embodiment of the present application;

Fig. 18 is an optional schematic diagram of the comb tooth structure provided by the embodiment of the present application;

FIG. 19 is an optional schematic diagram of a DMRS frequency domain location provided by an embodiment of the present application;

FIG. 20 is an optional schematic diagram of the frequency domain location of the DMRS provided by the embodiment of the present application;

FIG. 21 is an optional schematic diagram of a DMRS frequency domain location provided by an embodiment of the present application;

FIG. 22 is an optional schematic diagram of a DMRS frequency domain location provided by an embodiment of the present application;

FIG. 23 is an optional schematic diagram of a DMRS frequency domain location provided by an embodiment of the present application;

FIG. 24 is an optional schematic diagram of the frequency domain location of the DMRS provided by the embodiment of the present application;

FIG. 25 is an optional schematic diagram of a DMRS frequency domain location provided by an embodiment of the present application;

FIG. 26 is an optional schematic diagram of the frequency domain location of the DMRS provided by the embodiment of the present application;

FIG. 27 is an optional schematic diagram of the frequency domain location of the DMRS provided by the embodiment of the present application;

FIG. 28 is an optional schematic diagram of the frequency domain location of the DMRS provided by the embodiment of the present application;

FIG. 29 is an optional schematic diagram of a DMRS frequency domain location provided by an embodiment of the present application;

FIG. 30 is an optional schematic diagram of a DMRS frequency domain location provided by an embodiment of the present application;

FIG. 31 is an optional schematic diagram of the time-frequency domain position of the DMRS provided by the embodiment of the present application;

FIG. 32 is an optional schematic diagram of the time-frequency domain position of the DMRS provided by the embodiment of the present application;

FIG. 33 is an optional schematic diagram of the time-frequency domain position of the DMRS provided by the embodiment of the present application;

FIG. 34 is an optional schematic diagram of the time-frequency domain position of the DMRS provided by the embodiment of the present application;

FIG. 35 is an optional schematic structural diagram of a first terminal device provided in an embodiment of the present application;

FIG. 36 is an optional schematic structural diagram of a first terminal device provided by an embodiment of the present application;

FIG. 37 is a schematic structural diagram of a terminal device provided by an embodiment of the present application;

FIG. 38 is a schematic structural diagram of a chip according to an embodiment of the present application;

Fig. 39 is a schematic block diagram of a communication system provided by an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

FIG. 1 is a schematic diagram of an application scenario of an embodiment of the present application.

As shown in FIG. 1 , a communication system 100 may include a terminal device 110 and a network device 120 . The network device 120 may communicate with the terminal device 110 through an air interface. Multi-service transmission is supported between the terminal device 110 and the network device 120 .

It should be understood that the embodiment of the present application is only described by using the communication system 100 as an example, but the embodiment of the present application is not limited thereto. That is to say, the technical solutions of the embodiments of the present application can be applied to various communication systems, such as: Long Term Evolution (Long Term Evolution, LTE) system, LTE Time Division Duplex (Time Division Duplex, TDD), Universal Mobile Communication System (Universal Mobile Telecommunication System, UMTS), Internet of Things (Internet of Things, IoT) system, Narrow Band Internet of Things (NB-IoT) system, enhanced Machine-Type Communications (eMTC) system, 5G communication system (also known as New Radio (NR) communication system), or future communication systems, etc.

In the communication system 100 shown in FIG. 1 , the network device 120 may be an access network device that communicates with the terminal device 110 . The access network device can provide communication coverage for a specific geographical area, and can communicate with terminal equipment 110 (for example, user equipment (User Equipment, UE)) located in the coverage area.

The network device 120 may be an evolved base station (Evolutional Node B, eNB or eNodeB) in an LTE system, or a next generation radio access network (Next Generation Radio Access Network, NG RAN) device, or a base station ( gNB), or a wireless controller in a cloud radio access network (Cloud Radio Access Network, CRAN), or the network device 120 can be a relay station, an access point, a vehicle-mounted device, a wearable device, a hub, a switch, a bridge , routers, or network devices in the future evolution of the Public Land Mobile Network (Public Land Mobile Network, PLMN), etc.

The terminal device 110 may be any terminal device, including but not limited to a terminal device connected to the network device 120 or other terminal devices by wire or wirelessly.

For example, the terminal device 110 may refer to an access terminal, UE, subscriber unit, subscriber station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent, or user device . Access terminals can be cellular phones, cordless phones, Session Initiation Protocol (SIP) phones, IoT devices, satellite handheld terminals, Wireless Local Loop (WLL) stations, Personal Digital Assistant , PDA), handheld devices with wireless communication functions, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices, terminal devices in 5G networks or terminal devices in future evolution networks, etc.

The wireless communication system 100 may also include a core network device 130 that communicates with the base station. The core network device 130 may be a 5G core network (5G Core, 5GC) device, for example, Access and Mobility Management Function (Access and Mobility Management Function , AMF), another example, authentication server function (Authentication Server Function, AUSF), another example, user plane function network element (User Plane Function, UPF), and another example, session management function network element (Session Management Function, SMF). Optionally, the core network device 130 may also be a packet core evolution (Evolved Packet Core, EPC) device of the LTE network, for example, a data gateway (Session Management Function+Core Packet Gateway, SMF+PGW- C) Equipment. It should be understood that SMF+PGW-C can realize the functions of SMF and PGW-C at the same time. In the process of network evolution, the above-mentioned core network equipment may be called by other names, or a new network entity may be formed by dividing functions of the core network, which is not limited in this embodiment of the present application.

Various functional units in the communication system 100 may also establish a connection through a next generation network (next generation, NG) interface to implement communication.

For example, the terminal device establishes an air interface connection with the access network device through the Uu interface to transmit user plane data and control plane signaling; the terminal device can establish a control plane signaling connection with the AMF through the NG interface 1 (N1 for short); the access Network equipment such as the next generation wireless access base station (gNB), can establish a user plane data connection with UPF through NG interface 3 (abbreviated as N3); access network equipment can establish control plane signaling with AMF through NG interface 2 (abbreviated as N2) connection; UPF can establish a control plane signaling connection with SMF through NG interface 4 (abbreviated as N4); UPF can exchange user plane data with the data network through NG interface 6 (abbreviated as N6); AMF can communicate with SMF through NG interface 11 (abbreviated as N11) The SMF establishes a control plane signaling connection; the SMF may establish a control plane signaling connection with the PCF through an NG interface 7 (N7 for short).

FIG. 1 exemplarily shows a base station, a core network device and two terminal devices. Optionally, the wireless communication system 100 may include multiple base station devices and each base station may include other numbers of terminals within the coverage area. The device is not limited in the embodiment of this application.

Optionally, sidelink communication may be performed between different terminal devices 110 .

It should be noted that FIG. 1 is only an illustration of a system applicable to this application, and of course, the method shown in the embodiment of this application may also be applicable to other systems. Furthermore, the terms "system" and "network" are often used interchangeably herein. The term "and/or" in this article is just an association relationship describing associated objects, which means that there can be three relationships, for example, A and/or B can mean: A exists alone, A and B exist simultaneously, and there exists alone B these three situations. In addition, the character "/" in this article generally indicates that the contextual objects are an "or" relationship. It should also be understood that the "indication" mentioned in the embodiments of the present application may be a direct indication, may also be an indirect indication, and may also mean that there is an association relationship. For example, A indicates B, which can mean that A directly indicates B, for example, B can be obtained through A; it can also indicate that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also indicate that there is an association between A and B relation. It should also be understood that the "correspondence" mentioned in the embodiments of the present application may mean that there is a direct correspondence or an indirect correspondence between the two, or that there is an association between the two, or that it indicates and is indicated. , configuration and configured relationship. It should also be understood that the "predefined" or "predefined rules" mentioned in the embodiments of this application can be used by pre-saving corresponding codes, tables or other It is implemented by indicating related information, and this application does not limit the specific implementation. For example, pre-defined may refer to defined in the protocol. It should also be understood that in the embodiment of the present application, the "protocol" may refer to a standard protocol in the communication field, for example, it may include the LTE protocol, the NR protocol, and related protocols applied to future communication systems, and this application does not limit this .

In order to facilitate the understanding of the technical solutions of the embodiments of the present application, the related technologies of the embodiments of the present application are described below. The following related technologies can be combined with the technical solutions of the embodiments of the present application as optional solutions, and all of them belong to the embodiments of the present application. protected range.

According to the network coverage of the terminal performing side communication, side communication can be divided into network coverage inner communication as shown in Figure 2, partial network coverage side communication as shown in Figure 3, and side communication as shown in Figure 4 or Figure 5. The network coverage outside the line communication.

As shown in FIG. 2 , the network covers the inner line communication, and all terminal devices 210 performing side line communication are within the coverage of the same base station 220 .

As shown in FIG. 3 , a part of the network covers lateral communication, and a terminal device 320 located within the coverage of the base station 310 and a terminal device 330 located outside the coverage of the base station 310 perform lateral communication.

Wherein, the terminal device 320 located within the coverage of the base station 310 can receive the configuration signaling of the base station 310 and perform sidelink communication according to the configuration of the base station 310 . However, the terminal equipment 330 located outside the coverage of the base station 310 cannot receive the configuration signaling from the base station 310. The information carried in the physical sidelink broadcast channel (Physical Sidelink Broadcast Channel, PSBCH) determines the sidelink configuration for sidelink communication.

As shown in FIG. 4 , the network covers outbound communication, and all terminal devices 410 performing side communication are outside the coverage of the base station. All terminal devices 410 determine the sidelink configuration according to the pre-configuration information, so as to perform sidelink communication.

As shown in FIG. 5 , the network covers outbound communication, and all terminal devices 510 (including terminal device 510 - 1 and terminal device 510 - 2 ) performing side communication are outside the coverage of the base station. A plurality of terminal devices 510 form a communication group 500, in which there is a central control node 510-1, which can also be called a group head terminal or a cluster head (Cluster Header, CH), and the central control node has one of the following functions: Responsible for the establishment of communication groups; joining and leaving of group members; resource coordination, allocating side transmission resources for other terminals, receiving side communication feedback information from other terminals; resource coordination with other communication groups, etc. The members 510-2 of the communication group perform side communication based on the resources allocated by the central control node 510-1.

Device-to-device communication is a sidelink transmission technology based on Device to Device (D2D). It is different from the way communication data is received or sent by base stations in traditional cellular systems, so it has higher spectral efficiency. and lower transmission delay. The Internet of Vehicles system adopts a terminal-to-terminal direct communication method, and two transmission modes are defined in the 3rd Generation Partnership Project (3GPP): the first mode and the second mode.

The first mode: the transmission resources of the terminal are allocated by the base station, and the terminal sends data on the sidelink according to the resources allocated by the base station; the base station can allocate resources for a single transmission to the terminal, and can also allocate semi-static transmission to the terminal H. As shown in FIG. 2 , the terminal located within the coverage of the base station, the base station allocates transmission resources for sidelink transmission to the terminal.

The second mode: the terminal selects a resource from the resource pool for data transmission. As shown in Figure 4, the terminal is located outside the coverage of the base station, and the terminal independently selects transmission resources from the pre-configured resource pool for sidelink transmission; The pool autonomously selects transmission resources for sideline transmission.

In NR-Vehicle to Everything (V2X), vehicles need to support automatic driving, so higher requirements are placed on data interaction between vehicles, such as higher throughput, lower latency, Higher reliability, larger coverage, more flexible resource allocation, etc.

In NR-V2X, unicast, multicast and broadcast transmission modes are supported. For unicast transmission, there is only one terminal at the receiving end. As shown in Figure 6, unicast transmission is performed between UE1 and UE2. For multicast transmission, the receiving end is all terminals in a communication group, or all terminals within a certain transmission distance, as shown in Figure 7, UE1, UE2, UE3 and UE4 form a communication group 701, where UE1 To send data, the other terminal devices in the communication group 701 are all receiving terminals. For the broadcast transmission mode, the receiver terminal is any terminal device around the sender terminal. As shown in FIG. 8 , UE1 is the sender terminal, and the surrounding UE2-UE6 are all receiver terminals.

NR-V2X system frame structure

The time slot structure in NR-V2X is shown in Figure 9 and Figure 10. Figure 9 shows the time slot structure not including the Physical Sidelink Feedback Channel (PSFCH) in the time slot; Figure 10 shows the time slot structure including PSFCH gap structure.

As shown in Figure 9 or Figure 10, the Physical Sidelink Control Channel (PSCCH) in NR-V2X starts from the second symbol of the time slot in the time domain and occupies 2 or 3 symbols. {10, 12, 15, 20, 25} RBs may be occupied in the frequency domain. In order to reduce the complexity of the blind detection of the PSCCH by the UE, only one number of PSCCH symbols and one number of RBs are allowed to be configured in one resource pool. In addition, because the sub-channel is the minimum granularity of resource allocation for the Physical Sidelink Shared Channel (PSSCH) in NR-V2X, the number of RBs occupied by the PSCCH must be less than or equal to the number of RBs in a sub-channel in the resource pool. The number of included RBs, so as not to impose additional restrictions on PSSCH resource selection or allocation.

As shown in Figure 9, when PSFCH is not included in the time slot, PSSCH also starts from the second symbol of the time slot in the time domain, and the last symbol in the time slot is a guard interval (Guard period, GP) symbol, and the rest Symbol mapping PSSCH. The first symbol in this slot is a repetition of the second symbol, usually the receiving terminal uses the first symbol as an Automatic Gain Control (AGC) symbol, and the data on this symbol is usually not used for data resolution Tune. The PSSCH occupies K sub-channels in the frequency domain, and each sub-channel includes N consecutive RBs.

As shown in Figure 10, when the slot contains PSFCH, PSFCH occupies 2 symbols in the time domain, corresponding to the penultimate and penultimate symbols in the time slot, the data on the two symbols is the same, the first PSFCH symbol Usually used as an AGC symbol, one symbol before PSFCH is used as a GP symbol.

NR-V2X system DMRS structure

In NR-V2X, the DMRS pattern of PSCCH is the same as the DMRS pattern of NR's Physical Downlink Control Channel (PDCCH, Physical Downlink Control Channel). As shown in Figure 11, DMRS exists on each PSCCH symbol, in the frequency domain Indexes located in one RB include REs of {#1, #5, #9}. Wherein, one RB includes 12 REs, and the corresponding indexes (#) are: 0 to 11 respectively.

In NR-V2X, the frequency domain structure of PSSCH DMRS is shown in Figure 12, which shows that the REs occupied by PSSCH DMRS in one RB include: {#0, #2, #4, #6, #8, # 10}, that is, the REs whose indexes are 0, 2, 4, 6, 8, and 10 respectively.

NR-V2X defines a variety of PSSCH DMRS patterns. The PSSCH DMRS pattern determines the number of symbols and symbol positions occupied by the PSSCH DMRS in a slot. The PSSCH DMRS patterns supported by NR-V2X are shown in Table 1. The DMRS in Table 1 Each number in the symbol number represents the symbol index where the PSSCH DMRS is located, where the DMRS symbol is the symbol for transmitting the DMRS.

Table 1, PSSCH DMRS pattern

Among them, Figure 13 shows a schematic diagram of the time domain positions of 4 DMRS symbols when the number of PSSCH symbols is 13, the number of PSCCH symbols is 2, and the number of DMRS symbols is 4, including the following symbols: {1, 4, 7, 10}.

The DMRS pattern of the PSBCH in NR-V2X is similar to the DMRS pattern of the PSCCH. As shown in Figure 14, an RB is taken as an example. The DMRS exists on each PSBCH symbol, but the frequency domain position is slightly different from the DMRS of the PSCCH. {#0, #4, #8} REs of one RB. Among them, in a time slot, the first symbol is used as the AGC symbol, the last symbol is used as the GP symbol, and the second and third symbols are the symbols of the Sidelink Primary Synchronization Signal (S-PSS) , the fourth and fifth symbols are symbols of Sidelink Secondary Synchronization Signal (S-SSS).

Unlicensed Spectrum

The unlicensed spectrum is the spectrum allocated by the country and region that can be used for radio device communication. This spectrum is usually considered a shared spectrum, that is, communication devices in different communication systems can be used as long as they meet the regulatory requirements set by the country or region on the spectrum. To use this spectrum, there is no need to apply to the government for exclusive spectrum authorization.

In order to allow various communication systems that use unlicensed spectrum for wireless communication to coexist friendly on this spectrum, some countries or regions have stipulated regulatory requirements that must be met when using unlicensed spectrum. For example, the communication device follows the "listen before talking (LBT)" principle, that is, the communication device needs to perform channel detection before sending signals on the channel of the unlicensed spectrum. Only when the channel detection result indicates that the channel is idle, the Only the communication device can send the signal; if the result of the channel detection of the communication device on the channel of the unlicensed frequency spectrum is that the channel is busy, the communication device cannot send the signal. In order to ensure fairness, in a transmission, the duration of signal transmission by the communication device using the channel of the unlicensed spectrum cannot exceed the Maximum Channel Occupancy Time (MCOT).

Comb structure in NR-U system

Communication on the unlicensed frequency band usually needs to meet the corresponding regulatory requirements. For example, if the terminal wants to use the unlicensed frequency band for communication, the frequency band occupied by the terminal needs to be greater than or equal to 80% of the system bandwidth. Therefore, in order to allow as many users as possible to access the channel within the same time period, an interlace-based resource allocation method is defined in NR-U. A comb-tooth resource includes S discrete RBs in the frequency domain, and a total of M comb-tooth resources are included in the frequency band, and the RBs included in the m-th comb are {m, M+m, 2M+m, 3M+m,... }. In an example, as shown in FIG. 15 , the system bandwidth includes 30 RBs, including 5 comb teeth (that is, M=5), each comb tooth includes 6 RBs (that is, S=6), and one comb tooth The frequency domain intervals of two adjacent RBs are the same, that is, 5 RBs apart. It should be noted that the RB included in one comb can also be called an interlaced resource block (Interlaced Resource Block, IRB), and the comb can also be called an IRB.

In the sidelink transmission system (also known as SL-U system) working on unlicensed spectrum, if comb-based resource allocation granularity is adopted, the PSCCH, PSSCH and other channels of the SL-U system are all based on the comb-tooth structure , at this time, the frame structure of the SL-U system is shown in Figure 16, and the numbers in the boxes indicate the comb index. Figure 16 is a schematic diagram of a frame structure that only includes PSCCH and PSSCH in a time slot and does not include PSFCH; the bandwidth shown in Figure 16 includes 20 RBs, and 5 comb resources are configured, that is, M=5, and each comb resource includes 4 RB, the number in the box indicates the comb index. In Figure 16, the system configures PSCCH to occupy 1 comb tooth resource, and the time domain occupies 2 symbols. PSSCH uses comb teeth as the granularity. The first symbol in the time slot is an AGC symbol, and the last symbol is a GP symbol. In FIG. 16 , PSSCH1 occupies comb tooth #0 and comb tooth #1, and its corresponding PSCCH1 occupies comb tooth #0. PSSCH2 occupies comb tooth #2, that is, the comb tooth whose index is 2, and its corresponding PSCCH2 also occupies comb tooth #2. The first time domain symbol in Figure 16 is typically used as AGC, and the data on this symbol can be a repetition of the data on the second symbol.

It should be noted that, for the sake of simplicity, the resources occupied by the second-order sidelink control information (Sidelink Control Information, SCI) and the resources occupied by the PSCCH DMRS and PSSCH DMRS are not shown in FIG. 16 .

The SL-U system needs to support the comb structure, and how to design the PSCCH DMRS structure is a problem that needs to be solved.

In this embodiment of the application, there is a mapping relationship between RBs and physical resource blocks (Physical Resource Blocks, PRBs). Therefore, RBs and PRBs in this application are interchangeable.

In the embodiment of the present application, the RE is a subcarrier in the frequency domain. Therefore, in the frequency domain, there is a corresponding relationship between the RE and the subcarrier, and the RE and the subcarrier can be replaced with each other.

In order to facilitate understanding of the technical solutions of the embodiments of the present application, the technical solutions of the present application are described in detail below through specific examples. As optional solutions, the above related technologies may be combined with the technical solutions of the embodiments of the present application in any combination, and all of them belong to the protection scope of the embodiments of the present application. The embodiment of the present application includes at least part of the following content.

The wireless communication method provided in the embodiment of the present application is applied to the first terminal device, including:

The first terminal device receives the first channel sent by the second terminal device, or sends the first channel to the second terminal device, the first resource block RB includes at least two first demodulation reference signal DMRS resource elements RE, and the at least The two first DMRS REs include at least one of the start RE and the end RE of the first RB, the first RB is any RB in the first comb-tooth resource, and the first comb-tooth resource is the Comb resources occupied by the first channel in the frequency domain, the first DMRS RE is used to transmit the DMRS of the first channel.

In the embodiment of the present application, the first terminal device is any terminal device among the two terminal devices performing side communication, and the second terminal device is the other terminal device except the first terminal device among the two terminal devices performing side communication. a terminal device.

The first channel may be sent by the first terminal device to the second terminal device, or may be sent by the second terminal device to the first terminal device.

Take UE1 sending the first channel to UE2 as an example. When UE1 is the first terminal device, UE2 is the second terminal device. At this time, the first terminal device sends the first channel to the second terminal device; when UE2 is the first terminal device device, UE1 is the second terminal device, and at this time, the first terminal device receives the first channel sent by the second terminal device.

Optionally, the first channel is PSCCH or PSBCH.

In the embodiment of the present application, the SL-U system adopts the comb-based resource allocation granularity, and the first channel is transmitted based on the comb structure. Here, the comb resource occupied by the first channel in the frequency domain is called the first comb Tooth resources, the first comb-tooth resource includes a plurality of discrete RBs in the frequency domain, and the first RB is any RB in the plurality of discrete RBs included in the first comb-tooth resource.

In the embodiment of the present application, one RB may include L REs, and L is greater than 1. Optionally, L is 12.

The RE transmitting the DMRS of the first channel in the first RB may be referred to as the first DMRS RE. Wherein, the first RB includes at least two first DMRS REs. The at least two first DMRS REs included in the first RB may include one or two of the start RE 1701 and the end RE 1702 as shown in Figure 17, wherein the first RB includes L REs, and the index of each RE They are: 0, 1, 2, 3, 4, ..., L-1, the start RE 1701 is the first RE whose index is 0 in the first RB, and the end RE 1702 is the first RE whose index in the first RB is L- 1, the start RE and end RE belong to the edge REs of the first RB. At this time, the REs occupied by the DMRS of the first channel include at least one or two edge REs.

In one example, the REs occupied by the DMRS of the first channel in the first RRB include the start RE 1701, but do not include the end RE 1702.

In one example, the REs occupied by the DMRS of the first channel in the first RRB include the ending RE 1702 but not the starting RE 1701.

In an example, the REs occupied by the DMRS of the first channel in the first RRB include an end RE 1702 and a start RE 1701.

In the embodiment of the present application, the number of REs occupied by the DMRS of the first channel in the first RRB, that is, the number of first DMRS REs in the first RB, may be greater than 2. The at least two first DMRS REs may include other REs in the first RB in addition to one or two of the end RE 1702 and the start RE 1701.

In this embodiment of the present application, the channel estimation results of REs that do not transmit DMRS in the first RB are determined based on the channel estimation results of the first DMRS REs in the at least two first DMRS REs, and the first DMRE REs The channel estimation result of is determined based on the DMRS transmitted on the first DMRS RE, and the second RE is an RE that does not transmit the DMRS of the first channel.

For the receiving end terminal receiving the first channel, the receiving end terminal can use the DMRS transmitted on each first DMRS RE to perform channel estimation on each first DMRS RE respectively, obtain the channel estimation result of each first DMRS RE, and perform channel estimation by interpolation Or an extension method, based on the channel estimation result of the first DMRS RE, determine the channel estimation result of the REs that do not transmit the DMRS in the first RB.

When the RE that does not transmit the DMRS is located between two adjacent first DMRS REs, the channel estimation results of the two adjacent first DMRS REs are used for interpolation to obtain the channel estimation results of the RE. When the RE that does not transmit the DMRS is not located between two adjacent first DMRS REs, the channel estimation results of the adjacent multiple consecutive REs of the RE are used for extension to obtain the channel estimation results of the RE.

In the wireless communication method provided by the embodiment of the present application, for the SL-U system supporting the comb structure, if the DMRS is transmitted in the start RE and/or the end RE of an RB, the DMRS is transmitted in the edge RE of the RB without using the corresponding DMRSs of adjacent RBs perform joint channel estimation to improve channel estimation performance.

In some embodiments, the first channel does not occupy the second RB, the second RB is adjacent to the first RB, and the second RB belongs to the second comb resource.

Here, the second RB is an RB adjacent to the first RB, and the first RB belongs to the first comb resource, and the second RB belongs to the second comb resource. Here, if the first channel does not occupy the second RB, the first The channel does not occupy the second comb resource. Here, the second comb tooth resource may be occupied by a second channel different from the first channel, or may not be occupied by any channel.

In an example, as shown in FIG. 18 , among the illustrated 15 RBs, five comb resources are included: comb resource 1, comb resource 2, comb resource 3, comb resource 4, and comb resource 5. Each comb resource includes 3 RBs, comb resource 1 includes three RB1802, comb resource 2 includes three RB1801, comb resource 3 includes three RB 1803, when the first channel occupies comb resource 2, Then RB1802 or RB1803 adjacent to RB1801 of comb-tooth resource 2 is not occupied by the first channel, that is, the first channel does not occupy RB1802 or RB1803 , and at this time, the first channel does not occupy comb-tooth resource 1 or comb-tooth resource 3 .

In the wireless communication method provided by the embodiment of the present application, when the first channel occupies the first RB and does not occupy the second RB adjacent to the first RB, based on the DMRS on the first DMRS RE in the first RB, the The channel estimation is performed by the REs in the first RB, and the performance of the channel estimation is improved when joint channel estimation based on multiple RBs is not satisfied.

In this embodiment of the present application, the size of the first frequency domain interval can be maximized, and the first frequency domain interval is the frequency domain interval between adjacent first DMRS REs.

Here, the maximization of the first frequency domain interval can be understood as trying to make the interval difference between different first frequency domain intervals as small as possible, that is, to minimize the interval difference between different first frequency domain intervals, so as to avoid some first frequency domain intervals being very large and some There are cases where the frequency domain spacing is very small.

In an example, at least two first DMRS REs include 3 first DMRS REs, corresponding to two first frequency domain intervals, the first RB includes 12 REs and 3 first DMRS REs include the start RE and In the case of the end RE, the remaining first DMRS RE except the start RE and the end RE among the three first DMRS REs can be: any one of the second RE to the eleventh RE; when the remaining first DMRS RE is the second RE, and the two first frequency domain intervals are: 1 and 10 respectively. At this time, the first frequency domain interval of 1 can continue to increase with the change of the position of the remaining first DMRS RE ; When the remaining first DMRS RE is the 3rd RE, the two first frequency domain intervals are respectively: 2 and 9, at this time, the first frequency domain interval of 2 can also follow the remaining first DMRS RE The change of position continues to increase; when the remaining first DMRS RE is the 4th RE, the two first frequency domain intervals are: 3 and 8, ..., when the remaining first DMRS RE is the 6th RE, Then the two first frequency domain intervals are respectively: 5 and 6. When the remaining first DMRS RE is the seventh RE, the two first frequency domain intervals are respectively: 6 and 5. When continuing to change the remaining first DMRS RE The position of the DMRS RE, the remaining first DMRS RE is the eighth RE, the two first frequency domain intervals are: 7 and 4, and so on. It can be seen that when the remaining first DMRS RE is the 6th RE or the 7th RE, the two first frequency domain intervals are: 5 and 6 respectively, and at least two first DMRS REs satisfy the first frequency domain interval maximization .

Optionally, when the at least two first DMRS REs include an edge RE, and the other edge RE is not the first DMRS RE, the first DMRS RE adjacent to the edge RE among the at least two first DMRS REs The frequency domain interval with the edge RE is smaller than the first value, and the first value can be 2 or 3, thereby avoiding that the frequency domain interval between the first DMRS RE adjacent to the edge RE and the edge RE is too large, further When the channel estimation result of the RE that does not transmit the DMRS is determined through extension, the accuracy of the channel estimation result will be reduced.

In an example, at least two first DMRS REs include 3 first DMRS REs, corresponding to two first frequency domain intervals, the first RB includes 12 REs and 3 first DMRS REs include the start RE In this case, the remaining two REs except the starting RE among the three first DMRS REs can be: any two of the second RE to the eleventh RE; when the first value is 2, the remaining two The first DMRS RE close to the starting RE in the RE is the 11th RE. At this time, the last first DMRS RE among the three first DMRS REs can be: any one of the second RE to the tenth RE; when The last first DMRS RE is the second RE, and the two first frequency domain intervals are: 1 and 9 respectively. At this time, the first frequency domain interval of 1 can also vary with the position of the last first DMRS RE. The change continues to increase; when the last first DMRS RE is the third RE, the two first frequency domain intervals are respectively: 2 and 8, at this time, the first frequency domain interval of 2 can also follow the last first frequency domain interval The change of the position of a DMRS RE continues to increase; when the last first DMRS RE is the 4th RE, the two first frequency domain intervals are respectively: 3 and 7,..., when the last first DMRS RE is the 4th RE 6 REs, the two first frequency domain intervals are: 5 and 5, respectively, when the last first DMRS RE is the seventh RE, the two first frequency domain intervals are: 6 and 4, when continuing to change The position of the last first DMRS RE, the last first DMRS RE is the 8th RE, the two first frequency domain intervals are: 7 and 3, and so on. It can be seen that when the last first DMRS RE is the sixth RE, the two first frequency domain intervals are: 5 and 5 respectively, and at least two first DMRS REs satisfy the first frequency domain interval maximization.

In some embodiments, in the at least two first frequency domain intervals corresponding to the at least two first DMRS REs, different first frequency domain intervals have the same size, and the first frequency domain intervals are adjacent first frequency domain intervals. Frequency domain spacing between DMRS REs.

In the embodiment of the present application, when different first frequency domain intervals have the same size, the frequency domain intervals of two adjacent DMRS REs are the same, and the accuracy of the channel estimation results of each RE is equivalent, thereby improving the channel estimation performance.

In some embodiments, the number of first DMRS REs included in the at least two first DMRS REs is three.

At this time, the DMRS of the first channel occupies 3 REs in the first RB.

Taking different first frequency domain intervals with the same size and the DMRS of the first channel occupying 3 REs in the first RB as an example, the distribution mode of at least two first DMRS REs in the first RB includes one of the following:

Distribution mode A1, the at least two first DMRS REs include: the initial RE, the first RE, and the second RE, and the first RE and the second RE are the first RB except the REs other than the starting RE and the ending RE;

Distribution mode A2, the at least two first DMRS REs include: a third RE, a fourth RE, and the end RE, and the third RE and the fourth RE are the first RB except the first RE. REs other than the start RE and the end RE;

In the distribution mode A1, the DMRS of the first channel occupies three REs in the first RB including the start RE but not the end RE. Optionally, the initial RE and the first RE are adjacent first DMRS REs, and the first RE and the second RE are adjacent first DMRS REs. At this time, the first frequency domain interval A and the first frequency domain The intervals B have the same size, wherein the first frequency interval A is the frequency interval between the first RE and the start RE, and the first frequency interval B is the frequency interval between the first RE and the second RE.

Taking the distribution mode as A1 as an example, the at least two first DMRS REs include REs with indices {0, 5, 10} in the first RB.

As shown in Figure 19, the first RB includes 12 REs, the indexes of the REs in the first RB are respectively: 0, 1, ..., 10, 11, the index of the starting RE 1901 is 0, and the index of the first RE 1902 is 5, the index of the second RE 1903 is 10, the frequency domain interval between the initial RE and the first RE is 5, and the frequency domain interval between the first RE and the second RE is 5.

In the distribution mode A2, the DMRS of the first channel occupies three REs in the first RB including the end RE but not the start RE. Optionally, the third RE and the fourth RE are adjacent first DMRS REs, and the fourth RE and the end RE are adjacent first DMRS REs. At this time, the first frequency domain interval C and the first frequency domain interval The sizes of D are the same, where the first frequency domain interval C is the frequency domain interval between the third RE and the fourth RE, and the first frequency domain interval D is the frequency domain interval between the fourth RE and the end RE.

Taking the distribution mode as A2 as an example, the at least two first DMRS REs include REs with indices {1, 6, 11} in the first RB.

As shown in Figure 20, the first RB includes 12 REs, the indexes of the REs in the first RB are: 0, 1, ..., 10, 11, the index of the third RE2001 is 1, and the index of the fourth RE2003 is 6 , the index of the end RE is 11, the frequency domain interval between the third RE and the fourth RE is 5, and the frequency domain interval between the fourth RE and the end RE is 5.

In some embodiments, in the at least two first frequency domain intervals corresponding to the at least two first DMRS REs, the sizes of different first frequency domain intervals are not the same size, and the first frequency domain intervals are adjacent The frequency domain spacing between the first DMRS REs.

Here, the fact that the sizes of different first frequency domain intervals are not the same size can be understood as that there are at least two first frequency domain intervals with different sizes. At this time, the sizes of different first frequency domain intervals are not the same size may include:

The sizes of the first frequency domain intervals in at least two first frequency domain intervals are different; or,

Among the at least two first frequency domain intervals, some of the first frequency domain intervals have the same size, and some of the first frequency domain intervals have the same size.

In the embodiment of the present application, in the case that different sizes of the first frequency domain intervals are different, the distribution of the first DMRS RE is not limited to the technical limitation that the frequency domain intervals of two adjacent DMRS REs are the same, thereby improving the first Distribution flexibility of DMRS REs.

At this time, the DMRS of the first channel occupies 3 REs in the first RB.

Taking the sizes of different first frequency domain intervals are not the same size, and the DMRS of the first channel occupies 3 REs in the first RB as an example, the distribution mode of at least two first DMRS REs in the first RB includes one of the following:

Distribution mode B1, the at least two first DMRS REs include: the starting RE, the fifth RE, and the ending RE, and the fifth RE is the starting RE and the ending RE in the first RB. Describe REs other than End REs.

In the distribution mode B1, the DMRS of the first channel occupies three REs in the first RB, including the start RE and the end RE. Optionally, the start RE and the fifth RE are adjacent first DMRS REs, and the fifth RE and end RE are adjacent first DMRS REs. At this time, the first frequency domain interval E and the first frequency domain interval The sizes of F are different, where the first frequency domain interval E is the frequency domain interval between the start RE and the fifth RE, and the first frequency domain interval F is the frequency domain interval between the fifth RE and the end RE.

Taking the distribution mode as B1 as an example, the at least two first DMRS REs include REs with indices {0, 5, 11} in the first RB.

As shown in Figure 21, the first RB includes 12 REs, the indexes of the REs in the first RB are: 0, 1, ..., 10, 11, the index of the starting RE 2101 is 0, and the index of the fifth RE 2102 is 5, the index of the end RE 2103 is 11, the frequency domain interval between the start RE and the fifth RE is 5, and the frequency domain interval between the fifth RE and the end RE is 6.

Taking the distribution mode as B1 as an example, the at least two first DMRS REs include REs with indices {0, 6, 11} in the first RB.

As shown in Figure 22, the first RB includes 12 REs, the indexes of the REs in the first RB are respectively: 0, 1, ..., 10, 11, the index of the starting RE 2101 is 0, and the index of the fifth RE 2102 is 6, the index of the end RE 2103 is 11, the frequency domain interval between the start RE and the fifth RE is 6, and the frequency domain interval between the fifth RE and the end RE is 5.

In some embodiments, the number of first DMRS REs included in the at least two first DMRS REs is four.

At this time, the DMRS of the first channel occupies 4 REs in the first RB.

In the embodiment of the present application, the number of REs occupied by the DMRS is increased in the RB, so that the number of DMRS REs for transmitting the DMRS increases, and the performance of channel estimation using the DMRS in one RB is improved.

Taking the sizes of different first frequency domain intervals are not the same size, and the DMRS of the first channel occupies 4 REs in the first RB as an example, the distribution mode of at least two first DMRS REs in the first RB includes one of the following:

Distribution mode C1, the at least two first DMRS REs include: the initial RE, the sixth RE, the seventh RE and the eighth RE, the sixth RE, the seventh RE and the eighth RE REs other than the start RE and the end RE in the first RB;

Distribution mode C2, the at least two first DMRS REs include: the ninth RE, the tenth RE, the eleventh RE and the end RE, the ninth RE, the tenth RE and the eleventh RE The REs are REs in the first RB other than the start RE and the end RE.

Distribution mode C3, the at least two first DMRS REs include: the start RE, the twelfth RE, the thirteenth RE, and the end RE, and the twelfth RE and the thirteenth RE are REs other than the start RE and the end RE in the first RB.

In the distribution mode C1, the DMRS of the first channel occupies four REs in the first RB including the start RE but not the end RE. Optionally, the starting RE and the sixth RE are adjacent first DMRS REs, the sixth RE and the seventh RE are adjacent first DMRS REs, and the seventh RE and the eighth RE are adjacent first DMRS REs. RE, at this time, the sizes of the first frequency domain interval G, the first frequency domain interval H, and the first frequency domain interval I are different, wherein the first frequency domain interval G is the frequency domain between the initial RE and the sixth RE interval, the first frequency domain interval H is the frequency domain interval between the sixth RE and the seventh RE, and the first frequency domain interval I is the frequency domain interval between the seventh RE and the eighth RE. The different sizes of the first frequency domain interval G, the first frequency domain interval H, and the first frequency domain interval I can be understood as part of the size of the first frequency domain interval G, the first frequency domain interval H, and the first frequency domain interval I The sizes of the first frequency domain intervals are the same or all are different.

Taking the distribution mode as C1 as an example, the at least two first DMRS REs include REs with indices {0, 4, 7, 10} in the first RB.

As shown in Figure 23, the first RB includes 12 REs, the indexes of the REs in the first RB are respectively: 0, 1, ..., 10, 11, the index of the starting RE 2301 is 0, and the index of the sixth RE 2302 is 4, the index of the seventh RE 2303 is 7, the index of the eighth RE 2304 is 10, the frequency domain interval between the start RE and the sixth RE is 4, the frequency domain interval between the sixth RE and the seventh RE is 3, and the frequency domain interval between the seventh RE and the eighth RE is 3.

Taking the distribution mode as C1 as an example, the at least two first DMRS REs include REs with indices {0, 3, 7, 10} in the first RB.

As shown in Figure 24, the first RB includes 12 REs, the indexes of the REs in the first RB are respectively: 0, 1, ..., 10, 11, the index of the starting RE 2301 is 0, and the index of the sixth RE 2302 is 3, the index of the seventh RE 2303 is 7, the index of the eighth RE 2304 is 10, the frequency domain interval between the start RE and the sixth RE is 3, the frequency domain interval between the sixth RE and the seventh RE is 4, and the frequency domain interval between the seventh RE and the eighth RE is 3.

In the distribution mode C2, the DMRS of the first channel occupies four REs in the first RB including the end RE but not the start RE. Optionally, the ninth RE and the tenth RE are adjacent first DMRS REs, the tenth RE and the eleventh RE are adjacent first DMRS REs, and the eleventh RE and the end RE are adjacent first DMRS REs. DMRS RE, at this time, the sizes of the first frequency domain interval J, the first frequency domain interval K, and the first frequency domain interval L are different, where the first frequency domain interval J is the frequency between the ninth RE and the tenth RE. Domain spacing, the first frequency domain spacing K is the frequency domain spacing between the tenth RE and the eleventh RE, and the first frequency domain spacing L is the frequency domain spacing between the eleventh RE and the end RE. The different sizes of the first frequency domain interval J, the first frequency domain interval K, and the first frequency domain interval L can be understood as part of the size of the first frequency domain interval J, the first frequency domain interval K, and the first frequency domain interval L The sizes of the first frequency domain intervals are the same or all are different.

Taking the distribution mode as C2 as an example, the at least two first DMRS REs include REs with indices {1, 4, 7, 11} in the first RB.

As shown in Figure 25, the first RB includes 12 REs, the indexes of the REs in the first RB are respectively: 0, 1, ..., 10, 11, the index of the ninth RE 2501 is 1, and the index of the tenth RE 2502 is 4, the index of the eleventh RE 2503 is 7, the index of the end RE 2504 is 11, the frequency domain interval between the ninth RE and the tenth RE is 3, the frequency domain interval between the tenth RE and the eleventh RE The interval is 3, and the frequency domain interval between the eleventh RE and the end RE is 4.

Taking the distribution mode as C2 as an example, the at least two first DMRS REs include REs with indices {1, 4, 8, 11} in the first RB.

As shown in Figure 26, the first RB includes 12 REs, the indexes of the REs in the first RB are respectively: 0, 1, ..., 10, 11, the index of the ninth RE 2501 is 1, and the index of the tenth RE 2502 is 4, the index of the eleventh RE 2503 is 8, the index of the end RE 2504 is 11, the frequency domain interval between the ninth RE and the tenth RE is 3, the frequency domain interval between the tenth RE and the eleventh RE The interval is 4, and the frequency domain interval between the eleventh RE and the end RE is 3.

In the distribution mode C3, the DMRS of the first channel occupies four REs in the first RB, including the start RE and the end RE. Optionally, the start RE and the twelfth RE are adjacent first DMRS REs, the twelfth RE and the thirteenth RE are adjacent first DMRS REs, and the thirteenth RE and the end RE are adjacent For the first DMRS RE, at this time, the sizes of the first frequency domain interval M, the first frequency domain interval N, and the first frequency domain interval O are different, wherein the first frequency domain interval M is the difference between the initial RE and the twelfth RE The first frequency domain interval N is the frequency domain interval between the twelfth RE and the thirteenth RE, and the first frequency domain interval O is the frequency domain interval between the thirteenth RE and the end RE. The different sizes of the first frequency domain interval M, the first frequency domain interval N, and the first frequency domain interval O can be understood as part of the size of the first frequency domain interval M, the first frequency domain interval N, and the first frequency domain interval O The sizes of the first frequency domain intervals are the same or all are different.

Taking the distribution mode as C3 as an example, the at least two first DMRS REs include REs with indices {0, 4, 7, 11} in the first RB.

As shown in Figure 27, the first RB includes 12 REs, the indexes of the REs in the first RB are: 0, 1, ..., 10, 11, the index of the starting RE 2701 is 0, and the index of the twelfth RE 2702 The index is 4, the index of the thirteenth RE 2703 is 7, the index of the end RE 2704 is 11, the frequency domain interval between the start RE and the twelfth RE is 4, and the interval between the twelfth RE and the thirteenth RE The frequency domain interval between the thirteenth RE and the end RE is 4.

Taking the distribution mode as C3 as an example, the at least two first DMRS REs include REs with indices {0, 4, 8, 11} in the first RB.

As shown in Figure 28, the first RB includes 12 REs, the indexes of the REs in the first RB are: 0, 1, ..., 10, 11, the index of the start RE 2701 is 0, and the index of the twelfth RE 2702 The index is 4, the index of the thirteenth RE 2703 is 8, the index of the end RE 2704 is 11, the frequency domain interval between the start RE and the twelfth RE is 4, and the interval between the twelfth RE and the thirteenth RE The frequency domain interval of is 4, and the frequency domain interval between the thirteenth RE and the end RE is 3.

Taking the distribution mode as C3 as an example, the at least two first DMRS REs include REs with indices {0, 3, 7, 11} in the first RB.

As shown in Figure 29, the first RB includes 12 REs, the indexes of the REs in the first RB are: 0, 1, ..., 10, 11, the index of the starting RE 2701 is 0, and the index of the twelfth RE 2702 The index is 3, the index of the thirteenth RE 2703 is 7, the index of the end RE 2704 is 11, the frequency domain interval between the start RE and the twelfth RE is 3, and the interval between the twelfth RE and the thirteenth RE The frequency domain interval of is 4, and the frequency domain interval between the thirteenth RE and the end RE is 4.

In some embodiments, the DMRS of the first channel exists in the time domain on every symbol occupied by the first channel.

Taking the first channel as PSCCH as an example, in the time domain, PSCCH occupies the 2nd, 3rd and 4th symbols of a time slot, or, PSCCH occupies the 2nd and 3rd symbols of a time slot , then on each symbol occupied by the PSCCH, the DMRS of the first channel occupies at least one of the start RE and the end RE in the first RB, and the distribution of the DMRS of each symbol in the frequency domain is the same.

The first terminal device receives the first channel sent by the second terminal device, or sends the first channel to the second terminal device. The first resource block RB includes four first demodulation reference signal DMRS resource elements RE, different from the first frequency The domain intervals have the same size, the first frequency domain interval is the frequency domain interval between adjacent first DMRS REs, the first RB is any RB in the first comb-tooth resource, and the first comb-tooth The resource is a comb tooth resource occupied by the first channel in the frequency domain, and the first DMRS RE is used to transmit the DMRS of the first channel.

Taking UE1 sending the first channel to UE2 as an example, when UE1 is the first terminal device, UE2 is the second terminal device, and at this time, the first terminal device sends the first channel to the second terminal device. When UE2 is the first terminal device, UE1 is the second terminal device, and at this time, the first terminal device receives the first channel sent by the second terminal device.

Optionally, the first channel is PSCCH or PSBCH.

Here, the number of REs occupied by the DMRS of the first channel in the first RRB, that is, the number of first DMRS REs in the first RB is 4, and the frequency domain between adjacent first DMRS REs among the 4 first DMRS REs same interval.

Optionally, the four first DMRS REs may include one or two of the end RE 1702 and the start RE 1701, or may not include the start RE and the end RE.

When the RE that does not transmit the DMRS is located between two adjacent first DMRS REs, the channel estimation results of the two adjacent first DMRS REs are used for interpolation to obtain the channel estimation results of the RE. When the RE that does not transmit the DMRS is not located between two adjacent first DMRS REs, use the channel estimation results of the adjacent multiple consecutive REs of the RE for extension, or use the adjacent multiple consecutive REs of the RE The channel estimation result of the first DMRS RE is extended to obtain the channel estimation result of this RE.

In the wireless communication method provided by the embodiment of the present application, for the SL-U system supporting the comb-tooth structure, the number of REs occupied by the DMRS is increased in the RB. When performing channel estimation, it is unnecessary to use DMRS of adjacent RBs for joint channel estimation, while improving the performance of channel estimation using DMRS in one RB, and making the accuracy of channel estimation results of each RE comparable.

In some embodiments, the second frequency domain interval is the same as the third frequency domain interval, the second frequency domain interval is the frequency domain interval between the second DMRS RE and the starting RE of the first RB, the The second DMRS RE is the first DMRS RE with the closest frequency domain interval to the start RE in the first RB, and the third frequency domain interval is between the third DMRS RE and the end RE of the first RB The frequency domain interval between, the third DMRS RE is the first DMRS RE with the frequency domain interval closest to the end RE in the first RB.

In the case that the four first DMRS REs do not include the start RE and the end RE, the edge REs at both ends of the first RB do not belong to the first DMRS RE, then there is an interval between the second DMRS RE and the start RE at this time: The second frequency domain interval, there is an interval between the third DMRS RE and the end RE: the third frequency domain interval, here, make the second frequency domain interval and the third frequency domain interval consistent, avoid the second frequency domain interval and the third frequency domain interval The difference in frequency domain spacing leads to the situation that too many REs need to be extended, thereby improving the performance of channel estimation.

In some embodiments, the four first DMRS REs include REs with indices {1, 4, 7, 10} in the first RB.

As shown in Figure 30, the first RB includes 12 REs, the indexes of the REs in the first RB are: 0, 1, ..., 10, 11, and the 4 first DMRS REs include the following REs in the first RB: RE 3001 with index 1, RE 3002 with index 4, RE 3003 with index 4, RE 3004 with index 10. Wherein, the first frequency domain interval is: 3, and the second frequency domain interval and the third frequency domain interval are 1.

Taking the first channel as PSCCH as an example, in the time domain, PSCCH occupies the 2nd, 3rd and 4th symbols of a time slot, or, PSCCH occupies the 2nd and 3rd symbols of a time slot , then on each symbol occupied by the PSCCH, the DMRS of the first channel occupies 4 REs in the first RB, and the different first frequency domain intervals have the same size, and the distribution of the DMRS of each symbol in the frequency domain is the same.

In the following, the wireless communication method provided by the embodiment of the present application is further described.

The terminal performs channel estimation and data demodulation according to DMRS. In the NRSL system, if PSSCH and PSCCH occupy consecutive RBs, the terminal can perform channel estimation in combination with DMRS in adjacent RBs, thereby improving the performance of channel estimation. For example, the RBs occupied by the PSCCH of the terminal include RB#n and RB#(n+1), according to the PSCCH DMRS pattern in Figure 9, RE#9 in RB#n and RE in RB#(n+1) can be used #1 Perform joint channel estimation, such as using the DMRS on the two REs to obtain the channel estimation results of the two REs, and then use the channel estimation results of the two REs for interpolation, so that the RE# of RB#n can be obtained 10. Channel estimation results of RE#11 and RE#0 of RB#(n+1). However, when SL works in unlicensed spectrum, a comb-tooth structure is required. At this time, the RBs occupied by PSCCH are discrete, and the DMRS of adjacent RBs cannot be used for joint channel estimation, resulting in reduced channel estimation performance.

Embodiment 1. The RE index within one RB occupied by the PSCCH DMRS is {0, 5, 11} shown in 311 in FIG. 31 or {0, 6, 11} shown in 312 in FIG. 31 .

feature:

1. One RB includes 3 REs for transmitting PSCCH DMRS;

2. The PSCCH DMRS occupies the first (ie RE#0) and the last RE (ie RE#11) in the RB, and another DMRS occupies the middle RE (ie RE#5 or RE#6) in the RB.

Advantages: PSCCH DMRS occupies the REs on both sides of the RB, so that the channel estimation results of all REs in the RB can be obtained by interpolation based on the channel estimation results of two adjacent DMRS REs, without the need for extrapolation. , which can improve the channel estimation performance.

Embodiment 2, PSCCH DMRS occupies an RE index in one RB as {0, 5, 10} as shown in FIG. 32 or {1, 6, 11} as shown in FIG. 33 .

feature:

1. The frequency domain spacing between adjacent DMRS REs is the same (that is, 5 REs are spaced apart), and the frequency domain spacing between adjacent DMRS REs is maximized;

Advantages: The frequency domain spacing between adjacent DMRSs is the same, and the accuracy of channel estimation results of each RE is equivalent.

Embodiment 3: The RE index within one RB occupied by the PSCCH DMRS is {1, 4, 7, 10} as shown in FIG. 34 .

The DMRS structure is the same as the NR Uu system PUCCH DMRS structure;

Features: 4 REs of PSCCH DMRS are included in RB, and the frequency domain interval between two adjacent PSCCH DMRSs is the same;

Advantages: One RB includes 4 PSCCH DMRS REs, and the number of DMRS REs increases, improving the accuracy of channel estimation; the frequency domain interval between two adjacent DMRS REs is the same, and the accuracy of channel estimation results of each RE is equivalent.

By redesigning the REs occupied by PSCCH DMRS or increasing the number of DMRS REs in one RB, the performance of channel estimation using PSCCH DMRS in one RB can be improved.

The preferred embodiments of the present application have been described in detail above in conjunction with the accompanying drawings. However, the present application is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present application, various simple modifications can be made to the technical solutions of the present application. These simple modifications all belong to the protection scope of the present application. For example, the various specific technical features described in the above specific implementation manners can be combined in any suitable manner if there is no contradiction. Separately. As another example, any combination of various implementations of the present application can also be made, as long as they do not violate the idea of the present application, they should also be regarded as the content disclosed in the present application. For another example, on the premise of no conflict, the various embodiments described in this application and/or the technical features in each embodiment can be combined with the prior art arbitrarily, and the technical solutions obtained after the combination should also fall within the scope of this application. protected range.

It should also be understood that, in various method embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the order of execution, and the order of execution of the processes should be determined by their functions and internal logic, and should not be used in this application. The implementation of the examples constitutes no limitation. In addition, in this embodiment of the application, the terms "downlink", "uplink" and "sidelink" are used to indicate the transmission direction of signals or data, wherein "downlink" is used to indicate that the transmission direction of signals or data is sent from the station The first direction to the user equipment in the cell, "uplink" is used to indicate that the signal or data transmission direction is the second direction sent from the user equipment in the cell to the station, and "side line" is used to indicate that the signal or data transmission direction is A third direction sent from UE1 to UE2. For example, "downlink signal" indicates that the transmission direction of the signal is the first direction. In addition, in the embodiment of the present application, the term "and/or" is only an association relationship describing associated objects, indicating that there may be three relationships. Specifically, A and/or B may mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" in this article generally indicates that the contextual objects are an "or" relationship.

Fig. 35 is a schematic diagram of the structure and composition of the first terminal device provided by the embodiment of the present application. As shown in Fig. 35, the first terminal device 3500 includes:

The first transmission module 3501 is configured to receive the first channel sent by the second terminal device, or send the first channel to the second terminal device;

In some embodiments, the at least two first DMRS REs include:

The start RE, the first RE and the second RE, the first RE and the second RE are REs in the first RB other than the start RE and the end RE.

In some embodiments, the at least two first DMRS REs include REs with indices {0, 5, 10} in the first RB.

In some embodiments, the at least two first DMRS REs include:

A third RE, a fourth RE, and the end RE, where the third RE and the fourth RE are REs in the first RB other than the start RE and the end RE.

In some embodiments, the at least two first DMRS REs include REs with indices {1, 6, 11} in the first RB.

In some embodiments, the at least two first DMRS REs include:

The start RE, the fifth RE, and the end RE, the fifth RE being an RE in the first RB other than the start RE and the end RE.

In some embodiments, the at least two first DMRS REs include REs with indices {0, 5, 11} in the first RB.

In some embodiments, the at least two first DMRS REs include REs with indices {0, 6, 11} in the first RB.

In some embodiments, the at least two first DMRS REs include:

The starting RE, the sixth RE, the seventh RE, and the eighth RE, the sixth RE, the seventh RE, and the eighth RE are Describes REs other than the end RE.

In some embodiments, the at least two first DMRS REs include REs with indices {0, 4, 7, 10} in the first RB.

In some embodiments, the at least two first DMRS REs include REs with indices {0, 3, 7, 10} in the first RB.

In some embodiments, the at least two first DMRS REs include:

The ninth RE, the tenth RE, the eleventh RE, and the end RE, the ninth RE, the tenth RE, and the eleventh RE are the first RB except the start RE and RE other than the end RE.

In some embodiments, the at least two first DMRS REs include REs with indices {1, 4, 7, 11} in the first RB.

In some embodiments, the at least two first DMRS REs include REs with indices {1, 4, 8, 11} in the first RB.

In some embodiments, the at least two first DMRS REs include:

The start RE, the twelfth RE, the thirteenth RE, and the end RE, the twelfth RE and the thirteenth RE are the first RB except the start RE and the end RE End RE other than RE.

In some embodiments, the at least two first DMRS REs include REs with indices {0, 4, 7, 11} in the first RB.

In some embodiments, the at least two first DMRS REs include REs with indices {0, 4, 8, 11} in the first RB.

In some embodiments, the at least two first DMRS REs include REs with indices {0, 3, 7, 11} in the first RB.

In some embodiments, the DMRS of the first channel exists in the time domain on every time domain symbol occupied by the first channel.

In some embodiments, the first channel is a physical sidelink control channel PSCCH or a physical sidelink broadcast channel PSBCH.

Fig. 36 is a schematic diagram of the structure and composition of the first terminal device provided by the embodiment of the present application. As shown in Fig. 36, the first terminal device 3600 includes:

The second transmission module 3601 is configured to receive the first channel sent by the second terminal device, or send the first channel to the second terminal device;

Those skilled in the art should understand that the related description of the first terminal device in the embodiment of the present application can be understood with reference to the related description of the wireless communication method in the embodiment of the present application.

FIG. 37 is a schematic structural diagram of a terminal device 3700 provided in an embodiment of the present application. The terminal device may be a first terminal device. The terminal device 3700 shown in FIG. 37 includes a processor 3710, and the processor 3710 can call and run a computer program from a memory, so that the terminal device 3700 implements the method in the embodiment of the present application.

Optionally, as shown in FIG. 37 , the terminal device 3700 may further include a memory 3720 . Wherein, the processor 3710 may call and run a computer program from the memory 3720, so that the terminal device 3700 implements the method in the embodiment of the present application.

Wherein, the memory 3720 may be an independent device independent of the processor 3710 , or may be integrated in the processor 3710 .

Optionally, as shown in Figure 37, the terminal device 3700 may further include a transceiver 3730, and the processor 3710 may control the transceiver 3730 to communicate with other devices, specifically, to send information or data to other devices, or receive other Information or data sent by the device.

Wherein, the transceiver 3730 may include a transmitter and a receiver. The transceiver 3730 may further include antennas, and the number of antennas may be one or more.

Optionally, the terminal device 3700 may specifically be the first terminal device in the embodiment of the present application, and the terminal device 3700 may implement the corresponding processes implemented by the first terminal device in each method of the embodiment of the present application. For the sake of brevity, in This will not be repeated here.

FIG. 38 is a schematic structural diagram of a chip according to an embodiment of the present application. The chip 3800 shown in FIG. 38 includes a processor 3810, and the processor 3810 can call and run a computer program from the memory, so as to implement the method in the embodiment of the present application.

Optionally, as shown in FIG. 38 , the chip 3800 may further include a memory 3820 . Wherein, the processor 3810 can invoke and run a computer program from the memory 3820, so as to implement the method in the embodiment of the present application.

Wherein, the memory 3820 may be an independent device independent of the processor 3810 , or may be integrated in the processor 3810 .

Optionally, the chip 3800 may also include an input interface 3830 . Wherein, the processor 1310 can control the input interface 3830 to communicate with other devices or chips, specifically, can obtain information or data sent by other devices or chips.

Optionally, the chip 3800 may also include an output interface 3840 . Wherein, the processor 3810 can control the output interface 3840 to communicate with other devices or chips, specifically, can output information or data to other devices or chips.

Optionally, the chip can be applied to the first terminal device in the embodiment of the present application, and the chip can implement the corresponding processes implemented by the first terminal device in the various methods of the embodiments of the present application. For the sake of brevity, no more repeat.

It should be understood that the chip mentioned in the embodiment of the present application may also be called a system-on-chip, a system-on-chip, a system-on-a-chip, or a system-on-a-chip.

FIG. 39 is a schematic block diagram of a communication system 3900 provided by an embodiment of the present application. As shown in FIG. 39 , the communication system 3900 includes a first terminal device 3910 and a second terminal device 3920 .

Wherein, the first terminal device 3910 can be used to realize the corresponding functions realized by the terminal device in the above method, and the second device 3920 can be used to realize the corresponding functions realized by the first terminal device in the above method. This will not be repeated here.

It should be understood that the processor in the embodiment of the present application may be an integrated circuit chip, which has a signal processing capability. In the implementation process, each step of the above-mentioned method embodiments may be completed by an integrated logic circuit of hardware in a processor or instructions in the form of software. The above-mentioned processor can be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), an off-the-shelf programmable gate array (Field Programmable Gate Array, FPGA) or other available Program logic devices, discrete gate or transistor logic devices, discrete hardware components. Various methods, steps, and logic block diagrams disclosed in the embodiments of the present application may 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 connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, register. The storage medium is located in the memory, and the processor reads the information in the memory, and completes the steps of the above method in combination with its hardware.

It can be understood that the memory in the embodiments of the present application may be a volatile memory or a nonvolatile memory, or may include both volatile and nonvolatile memories. 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 programmable Erase Programmable Read-Only Memory (Electrically EPROM, EEPROM) or Flash. The volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of illustration and 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 DRAM, SDRAM), double data rate synchronous dynamic random access memory (Double Data Rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (Enhanced SDRAM, ESDRAM), synchronous connection dynamic random access memory (Synchlink DRAM, SLDRAM ) and Direct Memory Bus Random Access Memory (Direct Rambus RAM, DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but not be limited to, these and any other suitable types of memory.

It should be understood that the above-mentioned memory is illustrative but not restrictive. For example, the memory in the embodiment of the present application may also be a static random access memory (static RAM, SRAM), a dynamic random access memory (dynamic RAM, DRAM), Synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection Dynamic random access memory (synch link DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM), etc. That is, the memory in the embodiments of the present application is intended to include, but not be limited to, these and any other suitable types of memory.

The embodiment of the present application also provides a computer-readable storage medium for storing computer programs.

Optionally, the computer-readable storage medium can be applied to the first terminal device in the embodiment of the present application, and the computer program causes the computer to execute the corresponding processes implemented by the first terminal device in the methods of the embodiments of the present application, in order It is concise and will not be repeated here.

The embodiment of the present application also provides a computer program product, including computer program instructions.

Optionally, the computer program product can be applied to the first terminal device in the embodiment of the present application, and the computer program instructions cause the computer to execute the corresponding processes implemented by the first terminal device in the methods of the embodiments of the present application. For the sake of brevity , which will not be repeated here.

The embodiment of the present application also provides a computer program.

Optionally, the computer program can be applied to the first terminal device in the embodiment of the present application, and when the computer program is run on the computer, the computer executes the corresponding functions implemented by the first terminal device in the various methods in the embodiments of the present application. For the sake of brevity, the process will not be repeated here.

Those skilled in the art can appreciate 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 by hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present application.

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

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods may be implemented in other ways. For example, the device 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 can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can 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, each unit may exist separately physically, or two or more units may be integrated into one unit.

If the functions described above are realized in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory,) ROM, random access memory (Random Access Memory, RAM), magnetic disk or optical disc, etc., which can store program codes. .

The above is only a specific implementation of the application, but the scope of protection of the application is not limited thereto. Anyone familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the application. Should be covered within the protection scope of this application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

A method of wireless communication, the method comprising:

The first terminal device receives the first channel sent by the second terminal device, or sends the first channel to the second terminal device, the first resource block RB includes at least two first demodulation reference signal DMRS resource elements RE, and the at least The two first DMRS REs include at least one of the start RE and the end RE of the first RB, the first RB is any RB in the first comb-tooth resource, and the first comb-tooth resource is the Comb resources occupied by the first channel in the frequency domain, the first DMRS RE is used to transmit the DMRS of the first channel.
The method according to claim 1, wherein the first channel does not occupy a second RB, the second RB is adjacent to the first RB, and the second RB belongs to a second comb resource.
The method according to claim 1 or 2, wherein, in the at least two first frequency domain intervals corresponding to the at least two first DMRS REs, different first frequency domain intervals have the same size, and the first frequency domain The interval is the frequency domain interval between adjacent first DMRS REs.
The method according to claim 3, wherein the number of the first DMRS REs included in the at least two first DMRS REs is 3.
The method according to claim 4, wherein the at least two first DMRS REs comprise:

The start RE, the first RE, and the second RE, the first RE and the second RE are REs in the first RB other than the start RE and the end RE.
The method according to claim 5, wherein the at least two first DMRS REs include REs with indices {0, 5, 10} in the first RB.
The method according to claim 4, wherein the at least two first DMRS REs comprise:

A third RE, a fourth RE, and the end RE, where the third RE and the fourth RE are REs in the first RB other than the start RE and the end RE.
The method according to claim 7, wherein the at least two first DMRS REs include REs with indices {1, 6, 11} in the first RB.
The method according to claim 1 or 2, wherein, in the at least two first frequency domain intervals corresponding to the at least two first DMRS REs, the sizes of different first frequency domain intervals are not the same size, and the first The frequency domain interval is the frequency domain interval between adjacent first DMRS REs.
The method according to claim 9, wherein the number of the first DMRS REs included in the at least two first DMRS REs is 3.
The method according to claim 10, wherein the at least two first DMRS REs comprise:

The start RE, the fifth RE, and the end RE, the fifth RE being an RE in the first RB other than the start RE and the end RE.
The method according to claim 11, wherein the at least two first DMRS REs include REs with indices {0, 5, 11} in the first RB.
The method according to claim 11, wherein the at least two first DMRS REs include REs with indices {0, 6, 11} in the first RB.
The method according to claim 9, wherein the number of first DMRS REs included in the at least two first DMRS REs is four.
The method according to claim 14, wherein the at least two first DMRS REs comprise:

The starting RE, the sixth RE, the seventh RE, and the eighth RE, the sixth RE, the seventh RE, and the eighth RE are Describe REs other than End REs.
The method according to claim 15, wherein the at least two first DMRS REs include REs with indices {0, 4, 7, 10} within the first RB.
The method according to claim 15, wherein the at least two first DMRS REs include REs with indices {0, 3, 7, 10} within the first RB.
The method according to claim 14, wherein the at least two first DMRS REs comprise:

The ninth RE, the tenth RE, the eleventh RE, and the end RE, the ninth RE, the tenth RE, and the eleventh RE are the first RB except the start RE and RE other than the end RE.
The method according to claim 18, wherein the at least two first DMRS REs include REs with indices {1, 4, 7, 11} in the first RB.
The method according to claim 18, wherein the at least two first DMRS REs include REs with indices {1, 4, 8, 11} within the first RB.
The method according to claim 14, wherein the at least two first DMRS REs comprise:

The start RE, the twelfth RE, the thirteenth RE, and the end RE, the twelfth RE and the thirteenth RE are the first RB except the start RE and the end RE End RE other than RE.
The method according to claim 21, wherein the at least two first DMRS REs include REs with indices {0, 4, 7, 11} within the first RB.
The method according to claim 21, wherein the at least two first DMRS REs include REs with indices {0, 4, 8, 11} in the first RB.
The method according to claim 21, wherein the at least two first DMRS REs include REs with indices {0, 3, 7, 11} in the first RB.
The method according to any one of claims 1 to 24, wherein the DMRS of the first channel exists in the time domain on every time domain symbol occupied by the first channel.
The method according to any one of claims 1 to 25, wherein the first channel is a physical sidelink control channel (PSCCH) or a physical sidelink broadcast channel (PSBCH).
A method of wireless communication, the method comprising:

The first terminal device receives the first channel sent by the second terminal device, or sends the first channel to the second terminal device. The first resource block RB includes four first demodulation reference signal DMRS resource elements RE, different from the first frequency The domain intervals have the same size, the first frequency domain interval is the frequency domain interval between adjacent first DMRS REs, the first RB is any RB in the first comb-tooth resource, and the first comb-tooth The resource is a comb tooth resource occupied by the first channel in the frequency domain, and the first DMRS RE is used to transmit the DMRS of the first channel.
The method according to claim 27, wherein the second frequency domain interval is the same as the third frequency domain interval, and the second frequency domain interval is the frequency between the second DMRS RE and the starting RE of the first RB. domain interval, the second DMRS RE is the first DMRS RE with the closest frequency domain interval to the initial RE in the first RB, and the third frequency domain interval is the distance between the third DMRS RE and the first RE The frequency domain interval between the end REs of RBs, the third DMRS RE is the first DMRS RE that is closest to the frequency domain interval of the end REs in the first RB.
The method according to claim 27 or 28, wherein the four first DMRS REs include REs with indices {1, 4, 7, 10} in the first RB.
The method according to any one of claims 27 to 29, wherein the DMRS of the first channel exists in the time domain on every time domain symbol occupied by the first channel.
The method according to any one of claims 27 to 30, wherein the first channel is a physical sidelink control channel (PSCCH) or a physical sidelink broadcast channel (PSBCH).
A first terminal device, comprising:

The first transmission module is configured to receive the first channel sent by the second terminal device, or send the first channel to the second terminal device;

The first resource block RB includes at least two first demodulation reference signal DMRS resource element REs, the at least two first DMRS REs include at least one of the start RE and end RE of the first RB, the The first RB is any RB in the first comb-tooth resource, the first comb-tooth resource is the comb-tooth resource occupied by the first channel in the frequency domain, and the first DMRS RE is used to transmit the first Channel DMRS.
A first terminal device, comprising:

The second transmission module is configured to receive the first channel sent by the second terminal device, or send the first channel to the second terminal device;

The first resource block RB includes four first demodulation reference signal DMRS resource elements RE, and the sizes of different first frequency domain intervals are the same, and the first frequency domain interval is the frequency domain between adjacent first DMRS REs interval, the first RB is any RB in the first comb-tooth resource, the first comb-tooth resource is the comb-tooth resource occupied by the first channel in the frequency domain, and the first DMRS RE is used for transmission The DMRS of the first channel.
A terminal device, comprising: a processor and a memory, the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory, so that the terminal device executes any of claims 1 to 26 or 4. A method as claimed in any one of claims 27 to 31.
A chip, comprising: a processor, configured to invoke and run a computer program from a memory, so that a device installed with the chip executes the method according to any one of claims 1 to 26 or claims 27 to 31.
A computer-readable storage medium for storing a computer program, the computer program causing a computer to execute the method according to any one of claims 1-26 or 27-31.
A computer program product comprising computer program instructions for causing a computer to perform the method as claimed in any one of claims 1 to 26 or claims 27 to 31.
A computer program that causes a computer to execute the method according to any one of claims 1 to 26 or claims 27 to 31.