Signal sending method, signal receiving method, and terminal

Abstract

The present application belongs to the technical field of communications. Disclosed are a signal sending method, a signal receiving method, and a terminal. The signal sending method in the embodiments of the present application comprises: a first terminal sending a first reference signal and a second reference signal of a sidelink (SL) in the same first time unit, wherein the first time unit belongs to a shared resource pool, the first reference signal and the second reference signal are located in different second time units, or the first reference signal and the second reference signal are located in different resource elements (REs), and the size of the second time unit is less than the size of the first time unit.

Description

Signal sending method, signal receiving method and terminal

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on September 28, 2023, with application number 202311281235.8 and invention name “Signal Transmitting Method, Signal Receiving Method and Terminal”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application belongs to the field of communication technology, and specifically relates to a signal sending method, a signal receiving method and a terminal. Background Art

[0004] The NR system supports sidelink (SL), which is used for direct data transmission between terminals without going through network equipment. In FR2, to reduce the impact of phase noise, the SL phase tracking reference signal (PTRS) is introduced in SL. SL PTRS is also called physical sidelink shared channel (PSSCH) PTRS. In addition, in SL positioning, the SL positioning reference signal (PRS) is introduced for SL positioning. The SL PRS can be located in a dedicated resource pool or a shared resource pool.

[0005] For a shared resource pool, the transmission of SL PRS and SL PTRS may conflict.

[0006] Summary of the Invention

[0007] The embodiments of the present application provide a signal sending method, a signal receiving method, and a terminal, which can solve the problem of how to reduce the conflict between sending SL PRS and SL PTRS.

[0008] In a first aspect, a signal transmission method is provided, comprising:

[0009] The first terminal sends a first reference signal and a second reference signal of the side link SL in the same first time unit; the first time unit belongs to the shared resource pool;

[0010] The first reference signal and the second reference signal are located in different second time units, or the first reference signal and the second reference signal are located in different resource elements RE; and the size of the second time unit is smaller than the size of the first time unit.

[0011] In a second aspect, a signal receiving method is provided, comprising:

[0012] The second terminal receives a first reference signal and a second reference signal of the side link SL sent by the first terminal in the same first time unit; the first time unit belongs to the shared resource pool;

[0013] The first reference signal and the second reference signal are located in different second time units, or the first reference signal and the second reference signal are located in different resource elements RE; and the size of the second time unit is smaller than the size of the first time unit.

[0014] In a third aspect, a signal sending device is provided, including:

[0015] a sending module, configured to send a first reference signal and a second reference signal of a side link SL in the same first time unit; the first time unit belongs to a shared resource pool;

[0016] The first reference signal and the second reference signal are located in different second time units, or the first reference signal and the second reference signal are located in different resource elements RE; and the size of the second time unit is smaller than the size of the first time unit.

[0017] In a fourth aspect, a signal receiving device is provided, comprising:

[0018] a receiving module, configured to receive a first reference signal and a second reference signal of a side link SL sent by a first terminal in a same first time unit; the first time unit belongs to a shared resource pool;

[0019] The first reference signal and the second reference signal are located in different second time units, or the first reference signal and the second reference signal are located in different resource elements RE; and the size of the second time unit is smaller than the size of the first time unit.

[0020] In a fifth aspect, a first terminal is provided, which includes a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the method described in the first aspect are implemented.

[0021] In a sixth aspect, a first terminal is provided, comprising a processor and a communication interface, wherein the communication interface is configured to send a first reference signal and a second reference signal of a side link SL in the same first time unit; the first time unit belongs to a shared resource pool;

[0022] The first reference signal and the second reference signal are located in different second time units, or the first reference signal and the second reference signal are located in different resource elements RE; and the size of the second time unit is smaller than the size of the first time unit.

[0023] In the seventh aspect, a second terminal is provided, which includes a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the method described in the second aspect are implemented.

[0024] In an eighth aspect, a second terminal is provided, comprising a processor and a communication interface, wherein the communication interface is configured to receive a first reference signal and a second reference signal of a side link SL sent by a first terminal in the same first time unit, wherein the first time unit belongs to a shared resource pool;

[0025] The first reference signal and the second reference signal are located in different second time units, or the first reference signal and the second reference signal are located in different resource elements RE; and the size of the second time unit is smaller than the size of the first time unit.

[0026] In the ninth aspect, a readable storage medium is provided, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the method described in the first aspect are implemented, or the steps of the method described in the second aspect are implemented.

[0027] In the tenth aspect, a wireless communication system is provided, including: a first terminal and a second terminal, wherein the first terminal can be used to execute the steps of the method described in the first aspect, and the second terminal can be used to execute the steps of the method described in the second aspect.

[0028] In the eleventh aspect, a chip is provided, comprising a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the method described in the first aspect, or to implement the method described in the second aspect.

[0029] In a twelfth aspect, a computer program / program product is provided, wherein the computer program / program product is stored in a storage medium, and the program / program product is executed by at least one processor to implement the steps of the method described in the first aspect or the second aspect.

[0030] In an embodiment of the present application, the first terminal sends the first reference signal and the second reference signal of the side link SL in the same first time unit; the first time unit belongs to a shared resource pool; since the first reference signal and the second reference signal are sent in the same first time unit, a conflict may occur, therefore, the first reference signal and the second reference signal are located in different second time units, or the first reference signal and the second reference signal are located in different resource particles RE; the size of the second time unit is smaller than the size of the first time unit, which can reduce the collision between the first reference signal and the second reference signal, improve the reception performance of the first reference signal and the second reference signal, and thereby improve the demodulation performance of the second-level SCI and the SL positioning performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a schematic diagram of the architecture of a wireless communication system provided in an embodiment of the present application;

[0032] FIG2 is a schematic diagram of the architecture of a side link scenario provided in an embodiment of the present application;

[0033] FIG3 is a flow chart of a signal transmission method according to an embodiment of the present application;

[0034] FIG4 is a flow chart of a signal receiving method according to an embodiment of the present application;

[0035] FIG5 is a schematic diagram of a structure of a signal sending device according to an embodiment of the present application;

[0036] FIG6 is a schematic diagram of a structure of a signal receiving device according to an embodiment of the present application;

[0037] FIG7 is a schematic structural diagram of a communication device provided in an embodiment of the present application;

[0038] FIG8 is a schematic structural diagram of a terminal according to an embodiment of the present application. DETAILED DESCRIPTION

[0039] The following will be combined with the accompanying drawings in the embodiments of this application to clearly describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0040] The terms "first", "second", etc. in this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same type, and do not limit the number of objects, for example, the first object can be one or more. In addition, "or" in this application represents at least one of the connected objects. For example, "A or B" covers three options, namely, Option 1: including A but not including B; Option 2: including B but not including A; Option 3: including both A and B. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0041] The term "indication" in this application can be either a direct indication (or explicit indication) or an indirect indication (or implicit indication). A direct indication can be understood as the sender explicitly informing the receiver of specific information, the operation to be performed, or the requested result, etc. in the instruction sent; an indirect indication can be understood as the receiver determining the corresponding information based on the instruction sent by the sender, or making a judgment and determining the operation to be performed or the requested result, etc. based on the judgment result.

[0042] It is worth noting that the technology described in the embodiments of the present application is not limited to the Long Term Evolution (LTE) / LTE-Advanced (LTE-A) system, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency Division Multiple Access (SC-FDMA) or other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the technology described can be used for the systems and radio technologies mentioned above, as well as for other systems and radio technologies. The following description describes a New Radio (NR) system for illustrative purposes, and the NR terminology is used in most of the following description, but these technologies can also be applied to systems other than NR systems, such as the 6th generation (6G) system. thGeneration, 6G) communication system.

[0043] FIG1 is a block diagram of a wireless communication system applicable to an embodiment of the present application. The wireless communication system includes a terminal 11 and a network-side device 12. The terminal 11 may be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer), a notebook computer, a personal digital assistant (PDA), a handheld computer, a netbook, an ultra-mobile personal computer (UMPC), a mobile internet device (MID), an augmented reality (AR), a virtual reality (VR) device, a robot, a wearable device (Wearable Device), an aircraft (Flight Vehicle), a vehicle-mounted device (VUE), a ship-mounted device, a pedestrian user equipment (PUE), a smart home (home appliances with wireless communication capabilities, such as refrigerators, televisions, washing machines, or furniture), a game console, a personal computer (PC), an ATM, or a self-service machine, or other terminal-side devices. Wearable devices include: smart watches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. Among them, the vehicle-mounted device can also be called a vehicle-mounted terminal, a vehicle-mounted controller, a vehicle-mounted module, a vehicle-mounted component, a vehicle-mounted chip or a vehicle-mounted unit, etc. It should be noted that the specific type of the terminal 11 is not limited in the embodiment of the present application. The network side device 12 may include an access network device or a core network device, wherein the access network device may also be called a radio access network (Radio Access Network, RAN) device, a radio access network function or a radio access network unit. The access network device may include a base station, a wireless local area network (WLAN) access point (AP) or a wireless fidelity (WiFi) node, etc.Among them, the base station can be referred to as Node B (NB), Evolved Node B (eNB), the next generation Node B (gNB), New Radio Node B (NR Node B), access point, Relay Base Station (RBS), Serving Base Station (SBS), Base Transceiver Station (BTS), radio base station, radio transceiver, Basic Service Set (BSS), Extended Service Set (ESS), Home Node B (HNB), Home Evolved Node B (homeevolved Node B), Transmission Reception Point (TRP) or other appropriate terms in the relevant field. As long as the same technical effect is achieved, the base station is not limited to specific technical vocabulary. It should be noted that in the embodiment of the present application, only the base station in the NR system is used as an example for introduction, and the specific type of the base station is not limited.

[0044] The core network equipment may include but is not limited to at least one of the following: core network node, core network function, mobility management entity (MME), access mobility management function (AMF), session management function (SMF), user plane function (UPF), policy control function (PCF), policy and charging rules function unit (PCRF), edge application service discovery function (EASDF), unified data management (UDM), unified data repository (UDR), home subscriber server (HSS), centralized network configuration (CNC), network storage function (NRF), network exposure function (NEF), local NEF (L-NEF), binding support function (BSF), etc. Function, BSF), application function (Application Function, AF), etc. It should be noted that in the embodiment of the present application, only the core network device in the NR system is introduced as an example, and the specific type of the core network device is not limited.

[0045] First, the nouns and application scenarios involved in the embodiments of this application are introduced:

[0046] 1. The NR system supports sidelink (SL) transmission, which is used for direct data transmission between terminals without going through network devices, as shown in Figure 2.

[0047] NR SL defines two resource allocation modes: Mode 1, in which the base station schedules resources; and Mode 2, in which the terminal determines which resources to use for transmission. Resource information may come from a base station broadcast message or pre-configured information. If the terminal is within the base station range and has a Radio Resource Control (RRC) connection with the base station, it can operate in either Mode 1 or Mode 2. If the terminal is within the base station range but has no RRC connection with the base station, it can only operate in Mode 2. If the terminal is out of range, it can only operate in Mode 2, using pre-configured information for SL transmission.

[0048] In mode 1, the base station schedules / activates / releases the terminal's SL resources based on downlink control information (DCI); in mode 2, the terminal selects resources, and sidelink control information (SCI) indicates the resources selected by the terminal.

[0049] The resource granularity selected is the time slot in the time domain and the subchannel in the frequency domain.

[0050] 2. For 5G NR frequency range 2 (FR2), in order to reduce the impact of phase noise, SL PTRS (also known as Physical Sidelink Shared Channel (PSSCH) PTRS) is introduced in SL and basically follows the idea of ​​Uu uplink UL PTRS. According to different Modulation Coding Scheme (MCS) levels, the time domain density L of SL PRS in a time slot is 10 ... PT-RS It can be {1,2,4}, that is, it appears once every 1, 2 or 4 symbols. The larger the MCS level, the higher the L PT-RS The smaller the SL PTRS time domain mapping is, the smaller the DMRS symbol position is.

[0051] When the SL PTRS is mapped in the time domain and the time domain density is 2 or 4, the time domain density is maintained at 2 or 4 with the demodulation reference signal (DMRS) symbol as a reference.

[0052] In addition, the frequency domain density of SL-PTRS also follows the frequency domain density of UL PTRS. The frequency domain density K PT-RS∈{2,4}, that is, it appears once every 2 or 4 RBs.

[0053] 3. In SL positioning, support is provided for Scheme 1, which allocates SL-PRS resources based on network scheduling, and Scheme 2, which allocates SL-PRS resources based on terminal autonomous selection. In Scheme 1, dynamic scheduling is supported, with configured grant type 1 / type 2 resource allocation. Downlink control information (DCI) may be used for resource scheduling / activation / release. Terminal autonomous resource allocation includes sensing-based resource selection and random resource selection. Sidelink control information (SCI) is used for resource scheduling.

[0054] In addition, the SL PRS signal may be located in a dedicated resource pool or a shared resource pool. If it is a SL PRS dedicated resource pool, the SL PRS dedicated resource pool contains a physical sidelink control channel (PSCCH) and the SL PRS signal.

[0055] A single-stage SCI is used in dedicated resource pools. This SCI is carried on the PSCCH and is used to schedule the SL PRS. For shared resource pools, backward compatibility with SL services must be considered. This means transmitting information in the same resource pool as R16 / R17 services and minimizing the impact on R16 / R17 terminal transmission performance.

[0056] The shared resource pool includes PSCCH+PSSCH+SL PRS information transmission. The shared resource pool adopts two-stage SCI (two stage SCI) scheduling information. The first stage SCI (1 st SCI) is carried on PSCCH, the second level SCI (2 nd SCI) is carried on PSSCH.

[0057] In addition, in the shared resource pool, there are some restrictions on the terminal sending the SL PRS, for example, the terminal sends the SL PRS after the last symbol of the second-level SCI.

[0058] In addition, in the shared resource pool, the number of symbols below SL PRS can be supported SL-PRS Comb structure size (frequency domain density) combination:

[0059] {1,1},{1,2},{2,1},{2,2},{2,4},{4,1},{4,2},{4,4}.

[0060] 4. SL PRS is mapped to continuous symbols in the time domain, and the frequency domain density is 1, 2, 4 SL PTRS time domain mapping uses the DMRS symbol as a reference and maintains a time domain density of 1, 2, or 4 mappings, and a frequency domain density of 2 or 4 RBs. Therefore, there is a potential for symbol or RE collisions between SL PRS and SL PTRS.

[0061] First, consider only the case where SL PRS and SL PTRS conflict on potential symbols. When sending SL PRS and SL PTRS in the same slot, there are two ways to ensure that SL PRS can be sent on consecutive symbols and resolve potential conflicts on symbols:

[0062] Method 1-1: SL PRS and SL PTRS are not mapped to the same symbol and there is no puncture (if a conflict occurs, it is an error case). That is, SL PRS is mapped in the SL PTRS symbol interval.

[0063] Method 1-2: When sending SL PRS, the corresponding SL PTRS symbol can be dropped / punctured so that the SL PRS is sent with continuous symbols.

[0064] Compared to the two approaches above, approach 1-1 presents several issues, particularly limiting the number of symbols that can be transmitted via the SL PRS. For example, when the PSSCH MCS is large, the SL PTRS time-domain density is 1, meaning no symbols can be used for SL PRS transmission. Furthermore, when the SL PTRS time-domain density is 2, only one symbol can be used for SL PRS transmission. Even with a smaller MCS, the SL PTRS time-domain density is 4, but only three symbols can be used for SL PRS transmission. Currently, the maximum number of SL PRS symbols in a shared resource pool is four, making approach 1-1 unsuitable.

[0065] In comparison, methods 1-2 are more acceptable, but there are still some issues that need to be resolved. If the SL PTRS symbol is dropped / punctured, which SL PTRS symbols can be dropped / punctured, or which SL PTRS cannot be dropped / punctured? The embodiments of this application provide specific solutions to the above problems.

[0066] Specifically: The receiving terminal generally determines the SL PRS symbol position (starting symbol and symbol number) through the indication of the 2nd SCI carried in the PSSCH. Therefore, before determining the SL PRS symbol position, the receiving terminal must decode the 2nd SCI in advance. nd SCI is mapped starting from the symbol containing the first column of PSSCH DMRS, first in the frequency domain and then in the time domain, mapping x consecutive symbols. To decode the 2nd SCI, the terminal must first decode the PTRS near these "x symbols," then estimate and process the phase noise based on the PTRS before demodulating the 2nd SCI. Therefore, to ensure smooth acquisition of the 2nd SCI, the PTRS near the 2nd SCI cannot be dropped / punctured (in other words, the SL PRS must be mapped after the PTRS symbol near the 2nd SCI). Otherwise, acquisition of the 2nd SCI will fail. As for the remaining SL PTRS symbols that potentially collide with the SL PRS, since these symbols do not need to transmit data, the SL PTRS has limited effect, and even if it is dropped, it will not affect performance.

[0067] Secondly, if we only consider the situation where SL PRS and SL PTRS conflict on potential REs, we can allow SL PRS and SL PTRS to be sent on the same symbol. The following solutions are available:

[0068] Method 2-1: SL PRS and SL PTRS are not mapped to the same RE, and there is no puncturing (if a conflict occurs, it is an error case).

[0069] Method 2-2: If the SL PRS and SL PTRS collide on RE, drop / puncture the SL PTRS or SL PRS on the corresponding RE.

[0070] Method 2-2-1: Drop the SL PRS on the corresponding RE;

[0071] Method 2-2-2: Drop the SL PTRS on the corresponding RE;

[0072] For method 2-1, the possible application scenario is that the comb size of SL PRS is 2 or 4, and there are empty REs between the REs occupied by SL PRS on the same symbol for SL PTRS transmission. However, when the comb size of SL PRS is 1, it is not applicable.

[0073] For method 2-2, in one scenario, the SL PTRS frequency domain density is 2 or 4 RBs, while the minimum SL PRS frequency domain density in the shared resource pool is combo-4. Even if RE collision occurs, dropping the SL PRS corresponding to the RE will not significantly impact performance. However, in other situations (such as when the SL PRS has a high priority), dropping the SL PTRS RE is also possible.

[0074] For mode 2-2, since SL PRS and SL PTRS are allowed to be sent on one symbol, the power on each RE (EPRE) for sending SL PRS and SL PTRS needs further study. For details, please refer to the following embodiment.

[0075] The signal sending method and signal receiving method provided in the embodiments of the present application are described in detail below with reference to some embodiments and their application scenarios in conjunction with the accompanying drawings.

[0076] Referring to FIG3 , an embodiment of the present application provides a signal transmission method. The embodiment is performed by a first terminal. The method includes:

[0077] Step 101: A first terminal sends a first reference signal and a second reference signal of a side link SL in the same first time unit; the first time unit belongs to a shared resource pool;

[0078] The first reference signal and the second reference signal are located in different second time units, or the first reference signal and the second reference signal are located in different resource elements RE; and the second time unit is smaller than the first time unit.

[0079] Specifically, the first reference signal is, for example, a SL PRS, and the second reference signal is, for example, a SL PTRS or a SL CSI-RS.

[0080] In a shared resource pool, the SL PRS and the SL PTRS are sent in the same first time unit, which is, for example, a time slot.

[0081] To avoid conflicts, you can use at least one of the following methods:

[0082] Mode a: SL PRS and SL PTRS (if SL PTRS exists) are not sent (or mapped) in the same second time unit;

[0083] Mode b: SL PRS and SL PTRS are not sent in the same resource element (RE) (SL PRS and SL PTRS are allowed to be sent in the same second time unit). The second time unit is, for example, symbol.

[0084] Optionally, RE is a resource unit with a granularity smaller than the second time unit.

[0085] In the method of this embodiment, the first terminal sends the first reference signal and the second reference signal of the side link SL in the same first time unit; the first time unit belongs to a shared resource pool; since the first reference signal and the second reference signal are sent in the same first time unit, a conflict may occur, and therefore, the first reference signal and the second reference signal are located in different second time units, or the first reference signal and the second reference signal are located in different resource elements RE; the size of the second time unit is smaller than the size of the first time unit, which can reduce the collision between the first reference signal and the second reference signal, improve the reception performance of the first reference signal and the second reference signal, and thereby improve the demodulation performance of the second-level SCI and the SL positioning performance.

[0086] In the following embodiments, description is given by taking the case where the first reference signal is SL PRS and the second reference signal is SL PTRS as an example.

[0087] Optionally, the first reference signal is sent after a target time unit;

[0088] The target time unit satisfies at least one of the following:

[0089] The symbol of the adjacent PTRS after the 2nd SCI which is used for phase noise mitigating for 2 nd SCI);

[0090] When the time domain density of the second reference signal is 1, the target time unit is the last symbol of the second-level sidelink control information SCI;

[0091] When the time domain density of the second reference signal is 2 or 4, and the last X symbols of the second-level SCI include the second reference signal or the physical side link shared channel demodulation reference signal PSSCH DMRS, the target time unit is the last symbol of the second-level SCI; X is an integer greater than 0;

[0092] When the time domain density of the second reference signal is 2 or 4, and the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, the target time unit is the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI, or the symbol of the nearest second reference signal after the last symbol of the second-level SCI, or the nearest PSSCH DMRS symbol after the last symbol of the second-level SCI;

[0093] When the time domain density of the second reference signal is 2 or 4, the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, and the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI is a symbol of the second reference signal, the target time unit is a symbol of the second reference signal;

[0094] When the time domain density of the second reference signal is 2 or 4, the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, and the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI is not a symbol of the second reference signal, the target time unit is the last symbol of the second-level SCI, or the target time unit is the nearest PSSCH DMRS symbol after the last symbol of the second-level SCI.

[0095] Specifically, the SL PRS is sent after the target time unit so as not to affect the demodulation performance of the 2nd SCI.

[0096] The target time unit satisfies one of the following:

[0097] (1) If the temporal density of the SL PTRS is 1, the target time unit is the last symbol of the 2nd SCI;

[0098] (2) If the time domain density of the SL PTRS is 2 or 4, at least one of the following must be included:

[0099] (2-1) If the last X symbols of the 2nd SCI include SL PTRS or SL PSSCH DMRS, the target time unit is the last symbol of the 2nd SCI;

[0100] (2-2) If the last X symbols of the 2nd SCI do not include SL PTRS and SL PSSCH DMRS, at least one of the following is true:

[0101] (2-2-1) The target time unit is the nearest symbol between the SL PTRS and SL PSSCH DMRS symbols after the last symbol of the 2nd SCI, or the nearest SL PTRS symbol, or the nearest SL PSSCH DMRS symbol;

[0102] (2-2-2) If the closest symbol between the SL PTRS symbol and the PSSCH DMRS symbol after the last symbol of the 2nd SCI is the SL PTRS symbol, the target time unit is the SL PTRS symbol; otherwise, the target time unit is the last symbol of the 2nd SCI, or the closest PSSCH DMRS symbol after the last symbol of the 2nd SCI.

[0103] (3) The symbol of the second reference signal closest to the last symbol of the second-level sidelink control information SCI, which is used to suppress (or eliminate) the phase noise in the second-level SCI.

[0104] Optionally, X may be determined by at least one of protocol agreement / predefinition, network-side device preconfiguration / configuration, and terminal autonomous selection.

[0105] For example, X=1, for (2-1), if the last symbol of the 2nd SCI contains SL PTRS or SL PSSCH DMRS, the target time unit is the last symbol of the 2nd SCI;

[0106] For (2-2-1), if the last symbol of the 2nd SCI does not contain SL PTRS and SL PSSCH DMRS, the target time unit is the nearest symbol of the SL PTRS and SL PSSCH DMRS symbols after the last symbol of the 2nd SCI, or the target time unit is the nearest SL PTRS symbol after the last symbol of the 2nd SCI, or the target time unit is the nearest SL PSSCH DMRS symbol after the last symbol of the 2nd SCI;

[0107] For (2-2-2), if the closest symbol between the SL PTRS symbol and the PSSCH DMRS symbol after the last symbol of the 2nd SCI is the SL PTRS symbol, the target time unit is the SL PTRS symbol; otherwise, the target time unit is the last symbol of the 2nd SCI, or the closest PSSCH DMRS symbol after the last symbol of the 2nd SCI.

[0108] Optionally, the value of X is related to the time domain density of the SL PTRS. If the time domain density of the SL PTRS is 2, X=1; if the time domain density of the SL PTRS is 4, X=1 or 2 or 3.

[0109] Optionally, the second time unit occupied by the first reference signal is M consecutive second time units that can be used to send the first reference signal in the first time unit, where M is an integer greater than or equal to 1.

[0110] Exemplarily, the symbols occupied by the SL PRS are the last M consecutive symbols that can be used for SL PRS transmission in the slot.

[0111] Optionally, the M consecutive second time units include a second time unit for mapping the second reference signal. For example, when determining the last available M consecutive symbols, the second time unit of the second reference signal is not considered (or ignored).

[0112] Specifically, when determining the last available M consecutive symbols, SL PTRS is not considered (or ignored), or is replaced by the available M consecutive symbols that may include a second time unit for mapping a second reference signal, for example, the available M consecutive symbols may include a symbol of SL PTRS.

[0113] Optionally, when the second reference signal exists and the first reference signal exists in the first time unit, the time domain density of the second reference signal is greater than or equal to the target time domain density 2; or, the level of the modulation coding mode of the PSSCH of the first time unit is less than or equal to the first MCS level.

[0114] Optionally, there is a first reference signal in the first time unit, and the Tx terminal can be determined based on at least one method such as network side indication (such as DCI or other signaling), autonomous determination by the Tx terminal, and indications from other terminals; the Rx terminal can be determined based on at least one method such as Tx terminal indication (such as the first-level SCI indication sent by the Tx terminal in the shared resource pool), network side indication (such as DCI or other signaling).

[0115] Optionally, the target time domain density may be determined by at least one of protocol agreement, network side device configuration (or pre-configuration), and terminal selection.

[0116] Optionally, for FR2 (or if SL PTRS exists), the 1st SCI in the shared resource pool indicates that there is SL PRS in the current first time unit, then the time domain density of SL PTRS is not less than the target time domain density, and the target time domain density is, for example, 2; or, the time domain density of SL PTRS is greater than 1;

[0117] Or, the scheduling MCS level of PSSCH needs to be lower than a certain MCS level (such as MCS3), or the MCS level does not belong to a certain MCS level range, for example, the MCS is equal to the range when the SL PTRS time domain density is 1.

[0118] In the above implementation, a specific mapping method for the first reference signal is provided, which has a simple implementation scheme and low complexity, can reduce conflicts, and improve the reception performance of the first reference signal and the second reference signal.

[0119] Optionally, the first reference signal and the second reference signal are located in different second time units, including at least one of the following:

[0120] The first reference signal and the second reference signal are reference signals mapped to different second time units;

[0121] When the first reference signal and the second reference signal are mapped to the same second time unit, the first terminal discards the second reference signal or the first reference signal located in the second time unit.

[0122] Optionally, the case where the first reference signal and the second reference signal are mapped to the same second time unit can also be expressed as: the first reference signal and the second reference signal overlap or collide in the same second time unit.

[0123] Specifically, the first reference signal and the second reference signal may be mapped in the following manner:

[0124] Method 1: If SL PRS and SL PTRS are not sent in the same symbol, it includes one of the following:

[0125] Mode 1a: SL PRS and SL PTRS do not collide (or overlap) at the symbol level during mapping. This mode does not involve puncturing (if a collision occurs, it is an error case).

[0126] Mode 1b: If the SL PRS and SL PTRS collide on the same symbol, the first terminal discards the transmission of the SL PTRS symbol;

[0127] Mode 1c: If the SL PRS and the SL PTRS collide on the same symbol, the first terminal discards the sending of the SL PRS symbol.

[0128] Optionally, when the first reference signal and the second reference signal are reference signals mapped to different symbols, the second reference signal is a reference signal that skips the symbol of the first reference signal during mapping.

[0129] Optionally, the second reference signal is mapped in the following manner:

[0130] excluding the symbols of the first reference signal when determining the time index of the second reference signal mapping; or,

[0131] If it is determined that there is symbol overlap between the second reference signal and the first reference signal during mapping, the time index of the second reference signal is re-determined with reference to a symbol following the first reference signal.

[0132] Specifically, mapping method 1: limiting the time index (time indices) l to exclude the SL PRS symbol(s):

[0133] Mapping method 2: If the SL PTRS symbol calculated in the conventional way overlaps with the SL PRS symbol, the SL PTRS is mapped again using the symbol after the SL PRS symbol as a reference:

[0134] Optionally, when the first reference signal and the second reference signal are mapped to the same second time unit, the terminal discards the second reference signal or the first reference signal located in the second time unit, and the second reference signal does not include the symbol of the second reference signal as the target time unit, and / or does not include the symbol of the second reference signal before the target time unit. Optionally, if SL PRS collides with SL PTRS on the same symbol, the SL PTRS symbol does not include the SL PTRS symbol as the target symbol and / or the SL PTRS symbol before the target symbol.

[0135] In the above implementation, in order to reduce conflicts, the first reference signal and the second reference signal are located in different second time units, which can be achieved in a variety of ways with great flexibility.

[0136] Optionally, when the first reference signal and the second reference signal are reference signals mapped to different symbols, the maximum number of resources of the first reference signal is related to the second reference signal, including at least one of the following:

[0137] In the case where the second reference signal exists, the maximum number of resources of the first reference signal is a first number; in the case where the second reference signal does not exist, the maximum number of resources of the first reference signal is a second number; the first number is less than or equal to the second number;

[0138] The maximum number of resources of the first reference signal is related to the time domain density of the second reference signal; the greater the time domain density of the second reference signal, the greater the maximum number of resources of the first reference signal.

[0139] Optionally, the time domain density of the second reference signal and whether the second reference signal exists are related to the MCS level of the PSSCH and have a one-to-one mapping relationship, then the maximum number of resources of the first reference signal is related to the MCS level of the PSSCH and have a mapping relationship.

[0140] Specifically, the maximum number of resources for SL PRS is related to SL PTRS. The network-side device configuration (or pre-configuration) or protocol agreement specifies the association between the maximum number of resources for SL PRS and SL PTRS. The association includes at least one of the following:

[0141] Case 1: If SL PTRS is used, the maximum number of SL PRS resources is A; if SL PTRS is not used, the maximum number of SL PRS resources is B; for example, A = 10; B = 17;

[0142] Case 2: The maximum number of SL PRS resource resources is related to the specific SL PTRS time domain density and / or whether the second reference signal exists.

[0143] Exemplarily, the time domain density is 1: the maximum number of resources A of SL PRS resource, such as A=0; the time domain density is 2: the maximum number of resources B of SL PRS resource, such as B=3; the time domain density is 4: the maximum number of resources C of SL PRS resource, such as C=10; there is no SL PTRS (for example, the time domain density is considered to be infinite), the maximum number of resources D of SL PRS resource, such as D=17.

[0144] Optionally, the time domain density of the SL PTRS and whether the SL PTRS exists are related to the MCS level of the PSSCH and have a one-to-one mapping relationship. Then the maximum number of resources of the SL PRS resource is related to the MCS level of the PSSCH and have a mapping relationship. For example: the MCS level is in different threshold ranges, corresponding to different maximum numbers of resources of SL PRS resource. For example, a higher MCS level corresponds to a smaller maximum number of resources; a lower MCS level corresponds to a larger maximum number of resources. And vice versa.

[0145] Optionally, the maximum number of resources corresponding to the larger second reference signal time-domain density is greater than or equal to the maximum number of resources corresponding to the smaller second reference signal time-domain density.

[0146] In the above embodiment, when the first reference signal and the second reference signal are reference signals mapped on different symbols, when mapping the first reference signal, the maximum number of resources of the first reference signal is related to the second reference signal, for example, related to the time domain density, and the implementation scheme is simple.

[0147] Optionally, when the first reference signal and the second reference signal are reference signals mapped to different symbols and the second reference signal exists, the first terminal does not send the 4-symbol first reference signal.

[0148] Alternatively, the 4-symbol first reference signal cannot be (pre-)configured or indicated; or, only the 1-symbol or 2-symbol first reference signal can be (pre-)configured or indicated.

[0149] Optionally, the method further includes:

[0150] If the second reference signal exists, the first terminal maps the first reference signal and the second reference signal using a first mapping manner according to a time domain density of the second reference signal, where the first mapping manner includes at least one of the following:

[0151] The first reference signal and the second reference signal are reference signals mapped to different symbols;

[0152] When the first reference signal and the second reference signal are mapped to the same second time unit, the terminal discards the second reference signal or the first reference signal located in the second time unit.

[0153] Specifically, the manner of mapping the first reference signal and the second reference signal is determined according to the time domain density of the second reference signal.

[0154] Optionally, when the time domain density of the second reference signal is less than a first target threshold, the first mapping mode is that, when the first reference signal and the second reference signal are mapped to the same second time unit, the terminal discards the second reference signal or the first reference signal located in the second time unit;

[0155] When the time domain density of the second reference signal is not less than a first target threshold, the first mapping manner is that the first reference signal and the second reference signal are reference signals mapped to different symbols.

[0156] For example, the time domain density of the second reference signal is relatively small (such as L PT-RS ∈{1} or L PT-RS ∈{1,2}), adopt method 1b or 1c, and adopt the method of dropping after symbol collision (allowing the two to overlap in symbols); when the time domain density of the second reference signal is large (such as L PT-RS ∈{4} or L PT-RS ∈{2,4}), adopt method 1a, and use a method that avoids collision as much as possible (the two do not overlap in symbols).

[0157] In the above embodiment, the time domain density of the second reference signal of the first terminal is mapped to the first reference signal and the second reference signal using different first mapping methods, which can reduce conflicts and improve the reception performance of the reference signal. Optionally, since the time domain density of the second reference signal has a mapping relationship with the MCS level of the PSSCH, adopting different first mapping methods according to the time domain density of the second reference signal can also be expressed as: adopting different first mapping methods according to the MCS level of the PSSCH. For example: the MCS level of the PSSCH is within a certain threshold range, and different first mapping methods are adopted accordingly. For example, the first mapping method corresponding to a higher MCS level is that when the first reference signal and the second reference signal are mapped to the same second time unit, the terminal discards the second reference signal or the first reference signal located in the second time unit; the first mapping method corresponding to a lower MCS level is that the first mapping method is that the first reference signal and the second reference signal are reference signals mapped on different symbols. And vice versa.

[0158] Optionally, if the first reference signal and the second reference signal are located in different REs, at least one of the following is included:

[0159] The first reference signal and the second reference signal are reference signals mapped to different REs;

[0160] When the first reference signal and the second reference signal are mapped to the same RE, the first terminal discards the second reference signal or the first reference signal located in the RE.

[0161] Specifically, the first reference signal and the second reference signal are located in different REs, allowing them to be mapped to the same second time unit (such as symbol).

[0162] Optionally, the first reference signal and the second reference signal being reference signals mapped to different REs can also be expressed as: the first reference signal and the second reference signal do not overlap or collide on the RE. The first reference signal and the second reference signal being mapped to the same RE can also be expressed as: the first reference signal and the second reference signal being mapped to overlap or collide on the RE.

[0163] Optionally, when the first reference signal and the second reference signal are mapped to the same RE, the first reference signal and the second reference signal may be considered to share the same RE. If the overlapping RE and the values ​​on the RE are shared, the signals on these REs may serve as both part of the first reference signal and part of the second reference signal, while having different functions.

[0164] Method 2: If the SL PRS and SL PTRS are not sent in the same RE, it includes one of the following:

[0165] Mode 2a: SL PRS and SL PTRS mappings do not collide (or overlap) at the RE level. In this mode, there is no Puncturing (if a collision occurs, it is an error case).

[0166] Method 2b: If the SL PRS and SL PTRS collide on RE, drop (or puncture) the SL PTRS on the corresponding RE;

[0167] Method 2c: If the SL PRS and SL PTRS collide on RE, the SL PRS on the corresponding RE is dropped.

[0168] Optionally, when the first reference signal and the second reference signal are mapped to the same RE, the second reference signal does not include a symbol of the second reference signal as a target time unit, and at least one of the symbols of the second reference signal before the target time unit.

[0169] Specifically, if the SL PRS collides with the SL PTRS on the RE, the SL PTRS does not include the SL PTRS symbol that is the target time unit, or the SL PTRS symbol before the target time unit.

[0170] Optionally, the method further includes:

[0171] If the second reference signal exists, the first terminal maps the first reference signal and the second reference signal using a second mapping manner according to a frequency domain density of the first reference signal or the second reference signal, where the second mapping manner includes at least one of the following:

[0172] The first reference signal and the second reference signal are reference signals mapped to different REs;

[0173] When the first reference signal and the second reference signal are mapped to the same RE, the terminal discards the second reference signal or the first reference signal located in the RE.

[0174] Optionally, when the frequency domain density of the first reference signal or the second reference signal is less than a second target threshold, the second mapping mode is that, when the first reference signal and the second reference signal are mapped to the same RE, the terminal discards the second reference signal or the first reference signal located in the RE;

[0175] When the frequency domain density of the first reference signal or the second reference signal is not less than the second target threshold, the second mapping mode is that the first reference signal and the second reference signal are reference signals mapped to different REs.

[0176] Among them, the frequency domain density is less than the second target threshold, such as K PT-RS ∈{2}; or, the frequency domain density is not less than the second target threshold, and the frequency domain density is larger, such as K PT-RS ∈{4}.

[0177] Optionally, since the frequency domain density of the second reference signal has a mapping relationship with the bandwidth of the PSSCH (such as the number of RB / subchannels), adopting different second mapping methods according to the frequency domain density of the second reference signal can also be expressed as: adopting different second mapping methods according to the bandwidth of the PSSCH. For example: the bandwidth of the PSSCH is within a certain threshold range, and different second mapping methods are adopted accordingly. For example, the second mapping method corresponding to the larger bandwidth is that when the first reference signal and the second reference signal are mapped to the same RE, the terminal discards the second reference signal or the first reference signal located in the RE; the second mapping method corresponding to the smaller bandwidth is that when the first reference signal and the second reference signal are mapped to the same RE, the terminal discards the second reference signal or the first reference signal located in the RE. And vice versa.

[0178] In the above implementation, in order to reduce conflicts, the first reference signal and the second reference signal are located in different REs, which can be achieved in a variety of ways with great flexibility.

[0179] Optionally, the first terminal discards the second reference signal or the first reference signal located in the RE, which may be specifically implemented in the following manner:

[0180] The first terminal discards a reference signal corresponding to a lower priority between the first reference signal and the second reference signal based on the priorities of the first reference signal and the second reference signal.

[0181] Specifically, according to the priorities of the SL PTRS and the SL PRS, the symbol or RE corresponding to the reference signal with a lower priority is dropped.

[0182] Optionally, the priority can be determined by at least one of protocol agreement (or pre-definition), network side device pre-configuration (or configuration), or terminal autonomous selection. For example, network side device pre-configuration or configuration can be pre-configured or configured in a resource pool.

[0183] In the above implementation, based on the priorities of the first reference signal and the second reference signal, the reference signal corresponding to the lower priority is discarded, thereby reducing conflicts while taking into account both reception performance and user experience.

[0184] Optionally, when the first reference signal and the second reference signal are in the same second time unit, energy per resource element (Energy Per Resource Element, EPRE) of the first reference signal and the second reference signal in the second time unit satisfies one of the following:

[0185] The EPRE of the first reference signal and the second reference signal in the second time unit is the same;

[0186] The EPREs of the first reference signal and the second reference signal in the second time unit are calculated separately.

[0187] Specifically, when the first reference signal and the second reference signal are in the same second time unit, such as the same symbol, the EPREs of the first reference signal and the second reference signal in the second time unit are the same, or are calculated separately.

[0188] Optionally, when the EPREs of the first reference signal and the second reference signal in the second time unit are calculated separately, the EPRE of the first reference signal in the second time unit is obtained by evenly distributing and converting the RE occupied by the first reference signal according to the residual power; the residual power is the total power of the second time unit minus the power occupied by the second reference signal.

[0189] Optionally, the total power is expressed as The square of multiplied by the number of REs corresponding to the PSSCH bandwidth in the second time unit.

[0190] Specifically, the EPRE corresponding to the first reference signal can be obtained by evenly distributing the REs occupied by the first reference signal according to the residual power, wherein the total power of the second time unit minus the power occupied by the second reference signal is the residual power.

[0191] Optionally, the first reference signal or the second reference signal is a reference signal located in the RE that has not been discarded.

[0192] For example, the EPRE of the SL PTRS in the same symbol as the SL PRS is equal to the EPRE of the SL PTRS in other symbols, that is, equal to the EPRE of the PSSCH DMRS. The SLPTRS in other symbols are the SL PTRS in the same symbol as the SL PRS. For example, the EPRE of the PSSCH DMRS can be expanded by the amplitude factor To express or convert.

[0193] For example, the EPRE of the second reference signal (such as SL CSI-RS) can be expanded by the amplitude factor β CSI-RS express: Among them, Q p is the number of SL CSI-RS ports, is the layer number of PSSCH; is the amplitude expansion factor of DMRS.

[0194] For example: SL PTRS is 1 port, corresponding to PSSCH is 1.

[0195] If SL PTRS and SL PRS are not mapped to the same RE, and the SL PTRS frequency domain density is 2, then the amplitude expansion factor of SL PRS is Corresponding to Comb 2 and 4 respectively.

[0196] For example, if the SL PTRS frequency domain density is 2 and the SL PRS is Comb 2, then there is 1 PTRS RE and 12 SL PRS REs for every 2 RBs. The total power for every 2 RBs is Then the power of SL PTRS is The total power of SL PRS is The power of each RE of SL PRS is SL PRS amplitude expansion factor The same applies to other amplitude expansion factors.

[0197] If SL PTRS and SL PRS are not mapped to the same RE, and the SL PTRS frequency domain density is 4, then the amplitude expansion factor of SL PRS is Corresponding to Comb 2 and 4 respectively.

[0198] If SL PTRS and SL PRS are mapped to the same RE, Drop SL PRS RE, and SL PTRS frequency domain density is 2, then the amplitude expansion factor of SL PRS is Corresponding to Comb 1, 2, and 4 respectively.

[0199] If SL PTRS and SL PRS are mapped to the same RE, Drop SL PRS RE, and SL PTRS frequency domain density is 4, then the amplitude expansion factor of SL PRS is Corresponding to Comb 1, 2, and 4 respectively.

[0200] For example: SL PTRS is 2port, corresponding to PSSCH is 2.

[0201] If SL PTRS and SL PRS are not mapped to the same RE, and the SL PTRS frequency domain density is 2, then the amplitude expansion factor of SL PRS is Corresponding to Comb 2 and 4 respectively.

[0202] If SL PTRS and SL PRS are not mapped to the same RE, and the SL PTRS frequency domain density is 4, then the amplitude expansion factor of SL PRS is Corresponding to Comb 2 and 4 respectively.

[0203] If both SL PTRS ports are mapped to the same RE as SL PRS, Drop SL PRS RE, SL PTRS frequency domain density is 2, and the amplitude expansion factors of SL PRS are Corresponding to Comb 1, 2, and 4 respectively.

[0204] If the SL PTRS 2 ports are not mapped to the same RE as the SL PRS, Drop SL PRS RE, SL PTRS frequency domain density is 4, and the SL PRS amplitude expansion factors are Corresponding to Comb 1, 2, and 4 respectively.

[0205] If one of the SL PTRS2 ports is mapped to the same RE as the SL PRS, and the other is not, Drop SL PRS RE, the SL PTRS frequency domain density is 2, and the SL PRS amplitude expansion factors are Corresponding to Comb 2 and 4 respectively.

[0206] If one of the SL PTRS2 ports is mapped to the same RE as the SL PRS, and the other is not, Drop SL PRS RE, the SL PTRS frequency domain density is 2, and the SL PRS amplitude expansion factors are Corresponding to Comb 2 and 4 respectively.

[0207] β SL-PRS is the amplitude expansion factor of SL PRS, which can represent the EPRE of SL PRS. In general, if a symbol is used only for SL PRS transmission,

[0208] in, is the power expansion factor of SL PSSCH DMRS or PSSCH, is the number of layers of PSSCH, Comb size of SL PRS, Q prs The port number of SL PRS (usually 1).

[0209] Generally, the port number of SL PRS is 1, then

[0210] For example, if the SL PRS and the SL PTRS are sent in the same symbol, and the EPRE of the SL PRS and the SL PTRS are the same, then the corresponding EPRE (β SL-PRS or β SL-PTRS ) can be determined according to the following Table 1:

[0211] Table 1

[0212] Among them, K PT-RS It is the SL PTRS frequency domain density, 2RB, 4RB.

[0213] For example, in K PT-RS =2,Q ptrs =1, since 1 RB is equal to 6 REs, PTRS appears once every 2 RBs, 1 RB corresponds to 0.5 PTRS, and EPRE is

[0214] exist K PT-RS =2 (PTRS occurs once every 2 RBs), Q ptrs =2, since the number of ports is 2, PTRS appears once every 2 RBs, each port corresponds to 0.5 PTRS, and EPRE is

[0215] For example, if the SL PRS and the SL CSI-RS are sent in the same symbol, and the EPRE of the SL PRS and the SL CSI-RS are the same, then the corresponding EPRE (β SL-PRS or β SL-CSIRS ) can be determined according to the following Table 2:

[0216] Table 2

[0217] Among them, Q csirs Indicates the number of SL CSI-RS ports.

[0218] Optionally, the method further includes:

[0219] If the second reference signal exists, the first terminal maps the first reference signal and the second reference signal using a third mapping method based on the frequency domain density of the first reference signal or the second reference signal. The third mapping method includes at least one of the following:

[0220] Mode 3a: the first reference signal and the second reference signal are located in different second time units;

[0221] Mode 3b: The first reference signal and the second reference signal are located in different resource elements RE.

[0222] Optionally, when the frequency domain density of the first reference signal or the second reference signal is less than a third target threshold, the third mapping manner is that the first reference signal and the second reference signal are located in different second time units;

[0223] When the frequency domain density of the first reference signal or the second reference signal is not less than the third target threshold, the third mapping manner is that the first reference signal and the second reference signal are located in different resource elements RE.

[0224] Specifically, the first terminal may determine, according to the frequency domain density, which third mapping manner to adopt to map the first reference signal and the second reference signal.

[0225] For example, when the frequency domain density of the first reference signal or the second reference signal is less than the third target threshold, the third mapping mode is mode 3a;

[0226] When the frequency domain density of the first reference signal or the second reference signal is not less than the third target threshold, the third mapping mode is mode 3b; and vice versa.

[0227] In the above implementation, the first terminal maps the first reference signal and the second reference signal using different third mapping modes according to the frequency domain density of the first reference signal or the second reference signal, which can reduce conflicts and improve the reception performance of the reference signals.

[0228] Optionally, if the second reference signal exists, the first terminal maps the first reference signal and the second reference signal using a fourth mapping manner according to a time domain density of the second reference signal, where the fourth mapping manner includes at least one of the following:

[0229] The first reference signal and the second reference signal are located in different second time units;

[0230] The first reference signal and the second reference signal are located in different resource elements RE.

[0231] When the time domain density of the second reference signal is greater than a fourth target threshold, the fourth mapping manner is that the first reference signal and the second reference signal are located in different second time units;

[0232] When the frequency domain density of the second reference signal is not greater than a fourth target threshold, the fourth mapping manner is that the first reference signal and the second reference signal are located in different resource elements RE; and vice versa.

[0233] Referring to FIG. 4 , an embodiment of the present application provides a signal receiving method. The embodiment is performed by a second terminal. The method includes:

[0234] Step 201: A second terminal receives a first reference signal and a second reference signal of a side link SL sent by a first terminal in the same first time unit; the first time unit belongs to a shared resource pool;

[0235] The first reference signal and the second reference signal are located in different second time units, or the first reference signal and the second reference signal are located in different resource elements RE; and the size of the second time unit is smaller than that of the first time unit.

[0236] Optionally, the first reference signal is sent after a target time unit;

[0237] The target time unit satisfies at least one of the following:

[0238] A symbol of a second reference signal closest to the last symbol of the second-stage sidelink control information SCI for suppressing phase noise in the second-stage SCI;

[0239] When the time domain density of the second reference signal is 1, the target time unit is the last symbol of the second-level sidelink control information SCI;

[0240] When the time domain density of the second reference signal is 2 or 4, and the last X symbols of the second-level SCI include the second reference signal or the physical side link shared channel demodulation reference signal PSSCH DMRS, the target time unit is the last symbol of the second-level SCI; X is an integer greater than 0;

[0241] When the time domain density of the second reference signal is 2 or 4, and the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, the target time unit is the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI, or the symbol of the nearest second reference signal after the last symbol of the second-level SCI, or the nearest PSSCH DMRS symbol after the last symbol of the second-level SCI;

[0242] When the time domain density of the second reference signal is 2 or 4, the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, and the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI is a symbol of the second reference signal, the target time unit is a symbol of the second reference signal;

[0243] When the time domain density of the second reference signal is 2 or 4, the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, and the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI is not a symbol of the second reference signal, the target time unit is the last symbol of the second-level SCI, or the target time unit is the nearest PSSCH DMRS symbol after the last symbol of the second-level SCI.

[0244] Optionally, the second time unit occupied by the first reference signal is M consecutive second time units that can be used to send the first reference signal in the first time unit, where M is an integer greater than or equal to 1.

[0245] Optionally, the M consecutive second time units include a second time unit for mapping the second reference signal.

[0246] Optionally, when the second reference signal exists and the first reference signal exists in the first time unit, the time domain density of the second reference signal is greater than or equal to the target time domain density; or, the level of the modulation coding mode of the PSSCH of the first time unit is less than or equal to the first MCS level.

[0247] Optionally, when the second reference signal exists and the first reference signal exists in the first time unit, the terminal does not expect the time domain density of the second reference signal to be greater than or equal to the target time domain density; or, the terminal does not expect the level of the modulation coding mode of the PSSCH of the first time unit to be less than or equal to the first MCS level.

[0248] Optionally, the first reference signal and the second reference signal are located in different second time units, including at least one of the following:

[0249] The second terminal does not expect the first reference signal and the second reference signal to be mapped to the same second time unit;

[0250] When the first reference signal and the second reference signal are mapped to the same second time unit, the second terminal does not expect to receive the second reference signal, but expects to receive the first reference signal; or, the second terminal does not expect to receive the first reference signal, but expects to receive the second reference signal.

[0251] Optionally, when the second terminal does not expect the first reference signal and the second reference signal to be mapped to the same symbol, the second reference signal is a reference signal that skips the symbol of the first reference signal during mapping.

[0252] Optionally, when the first reference signal and the second reference signal are mapped to the same second time unit, the second reference signal does not include a symbol of the second reference signal as a target time unit and / or a symbol of the second reference signal before the target time unit; the target time unit satisfies at least one of the following:

[0253] A symbol of a second reference signal closest to the last symbol of the second-stage sidelink control information SCI for suppressing phase noise in the second-stage SCI;

[0254] When the time domain density of the second reference signal is 1, the target time unit is the last symbol of the second-level sidelink control information SCI;

[0255] When the time domain density of the second reference signal is 2 or 4, and the last X symbols of the second-level SCI include the second reference signal or the physical side link shared channel demodulation reference signal PSSCH DMRS, the target time unit is the last symbol of the second-level SCI; X is an integer greater than 0;

[0256] When the time domain density of the second reference signal is 2 or 4, and the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, the target time unit is the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI, or the symbol of the nearest second reference signal after the last symbol of the second-level SCI, or the nearest PSSCH DMRS symbol after the last symbol of the second-level SCI;

[0257] When the time domain density of the second reference signal is 2 or 4, the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, and the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI is a symbol of the second reference signal, the target time unit is a symbol of the second reference signal;

[0258] When the time domain density of the second reference signal is 2 or 4, the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, and the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI is not a symbol of the second reference signal, the target time unit is the last symbol of the second-level SCI, or the target time unit is the nearest PSSCH DMRS symbol after the last symbol of the second-level SCI.

[0259] Optionally, when the second terminal does not expect the first reference signal and the second reference signal to be mapped to the same second time unit, the maximum number of resources of the first reference signal is related to the second reference signal, including at least one of the following:

[0260] In the case where the second reference signal exists, the maximum number of resources of the first reference signal is a first number; in the case where the second reference signal does not exist, the maximum number of resources of the first reference signal is a second number; the first number is less than or equal to the second number;

[0261] The maximum number of resources of the first reference signal is related to the time domain density of the second reference signal; the greater the time domain density of the second reference signal, the greater the maximum number of resources of the first reference signal.

[0262] Optionally, the second terminal receiving a first reference signal and a second reference signal of a side link SL sent by the first terminal in a same first time unit includes:

[0263] If the second reference signal exists, the second terminal receives the first reference signal and the second reference signal in a first receiving mode according to a time domain density of the second reference signal, where the first receiving mode includes at least one of the following:

[0264] The second terminal does not expect the first reference signal and the second reference signal to be mapped to the same second time unit;

[0265] When the first reference signal and the second reference signal are mapped to the same second time unit, the second terminal does not expect to receive the second reference signal, but expects to receive the first reference signal; or, the second terminal does not expect to receive the first reference signal, but expects to receive the second reference signal.

[0266] Optionally, the second terminal does not expect the first reference signal and the second reference signal to be mapped to the same second time unit, which can also be expressed as "the second terminal does not expect to receive the first reference signal and the second reference signal in the same second time unit".

[0267] Optionally, when the time domain density of the second reference signal is less than a first target threshold, the first receiving mode is that, when the first reference signal and the second reference signal are mapped to the same second time unit, the second terminal does not expect to receive the second reference signal, but expects to receive the first reference signal; or, the second terminal does not expect to receive the first reference signal, but expects to receive the second reference signal.

[0268] When the time domain density of the second reference signal is not less than a first target threshold, the first receiving mode is that the second terminal does not expect the first reference signal and the second reference signal to be mapped to the same second time unit.

[0269] Optionally, the first reference signal and the second reference signal are located in different resource elements RE, including at least one of the following:

[0270] The second terminal does not expect the first reference signal and the second reference signal to be mapped to the same RE;

[0271] When the first reference signal and the second reference signal are mapped to the same RE, the second terminal does not expect to receive the second reference signal, but expects to receive the first reference signal; or, the second terminal does not expect to receive the first reference signal, but expects to receive the second reference signal.

[0272] Optionally, when the first reference signal and the second reference signal are mapped to the same RE, the second reference signal does not include a symbol of the second reference signal as a target time unit and / or a symbol of the second reference signal before the target time unit; the target time unit satisfies at least one of the following:

[0273] A symbol of a second reference signal closest to the last symbol of the second-stage sidelink control information SCI for suppressing phase noise in the second-stage SCI;

[0274] When the time domain density of the second reference signal is 1, the target time unit is the last symbol of the second-level sidelink control information SCI;

[0275] When the time domain density of the second reference signal is 2 or 4, and the last X symbols of the second-level SCI include the second reference signal or the physical side link shared channel demodulation reference signal PSSCH DMRS, the target time unit is the last symbol of the second-level SCI; X is an integer greater than 0;

[0276] When the time domain density of the second reference signal is 2 or 4, and the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, the target time unit is the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI, or the symbol of the nearest second reference signal after the last symbol of the second-level SCI, or the nearest PSSCH DMRS symbol after the last symbol of the second-level SCI;

[0277] When the time domain density of the second reference signal is 2 or 4, the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, and the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI is a symbol of the second reference signal, the target time unit is a symbol of the second reference signal;

[0278] When the time domain density of the second reference signal is 2 or 4, the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, and the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI is not a symbol of the second reference signal, the target time unit is the last symbol of the second-level SCI, or the target time unit is the nearest PSSCH DMRS symbol after the last symbol of the second-level SCI.

[0279] Optionally, the second terminal receiving a first reference signal and a second reference signal of a side link SL sent by the first terminal in a same first time unit includes:

[0280] If the second reference signal exists, the second terminal receives the first reference signal and the second reference signal in a second receiving mode according to a frequency domain density of the first reference signal or the second reference signal, where the second receiving mode includes at least one of the following:

[0281] The second terminal does not expect the first reference signal and the second reference signal to be mapped to the same RE;

[0282] When the first reference signal and the second reference signal are mapped to the same RE, the second terminal does not expect to receive the second reference signal, but expects to receive the first reference signal; or, the second terminal does not expect to receive the first reference signal, but expects to receive the second reference signal.

[0283] Optionally, the second terminal does not expect the first reference signal and the second reference signal to be mapped to the same RE, which can also be expressed as "the second terminal does not expect to receive the first reference signal and the second reference signal in the same RE".

[0284] Optionally, when the frequency domain density of the first reference signal or the second reference signal is less than a second target threshold, the second reception mode is that, when the first reference signal and the second reference signal are mapped to the same RE, the second terminal does not expect to receive the second reference signal, but expects to receive the first reference signal; or, the second terminal does not expect to receive the first reference signal, but expects to receive the second reference signal;

[0285] When the frequency domain density of the first reference signal or the second reference signal is not less than the second target threshold, the second receiving mode is that the second terminal does not expect the first reference signal and the second reference signal to be mapped to the same RE.

[0286] Optionally, when the first reference signal and the second reference signal are in the same second time unit, energy EPRE of each resource element of the first reference signal and the second reference signal in the second time unit satisfies one of the following:

[0287] The EPRE of the first reference signal and the second reference signal in the second time unit is the same;

[0288] The EPREs of the first reference signal and the second reference signal in the second time unit are calculated separately.

[0289] Optionally, when the EPREs of the first reference signal and the second reference signal in the second time unit are calculated separately, the EPRE of the first reference signal in the second time unit is obtained by uniformly distributing the REs occupied by the first reference signal according to the residual power; the residual power is the total power of the second time unit minus the power occupied by the second reference signal.

[0290] Optionally, the first reference signal or the second reference signal is a reference signal located in RE that has not been discarded.

[0291] Optionally, the second terminal receiving a first reference signal and a second reference signal of a side link SL sent by the first terminal in a same first time unit includes:

[0292] If the second reference signal exists, the second terminal receives the first reference signal and the second reference signal in a third receiving mode according to a frequency domain density of the first reference signal or the second reference signal, where the third receiving mode includes at least one of the following:

[0293] The second terminal expects to receive a first reference signal and a second reference signal located in different second time units;

[0294] The second terminal expects to receive a first reference signal and a second reference signal located in different resource elements RE.

[0295] Optionally, when the frequency domain density of the first reference signal or the second reference signal is less than a third target threshold, the third receiving mode is that the second terminal expects to receive the first reference signal and the second reference signal in different second time units;

[0296] When the frequency domain density of the first reference signal or the second reference signal is not less than the third target threshold, the third receiving mode is that the second terminal expects to receive the first reference signal and the second reference signal located in different resource elements RE.

[0297] The specific implementation process and technical effects of the method of this embodiment are similar to those in the first terminal side method embodiment. For details, please refer to the detailed introduction in the first terminal side method embodiment, and no further details will be given here.

[0298] The signal transmission method provided in the embodiments of the present application may be performed by a signal transmission device. In the embodiments of the present application, the signal transmission device provided in the embodiments of the present application is described by taking a signal transmission device performing the signal transmission method as an example. The signal receiving method provided in the embodiments of the present application may be performed by a signal receiving device. In the embodiments of the present application, the signal receiving device provided in the embodiments of the present application is described by taking a signal receiving device performing the signal receiving method as an example.

[0299] FIG5 is a schematic diagram of a structure of a signal transmitting device provided in an embodiment of the present application. As shown in FIG5 , the signal transmitting device provided in this embodiment includes:

[0300] A sending module 510 is configured to send a first reference signal and a second reference signal of a side link SL in the same first time unit; the first time unit belongs to a shared resource pool;

[0301] The first reference signal and the second reference signal are located in different second time units, or the first reference signal and the second reference signal are located in different resource elements RE; and the size of the second time unit is smaller than the size of the first time unit.

[0302] Optionally, the first reference signal is sent after a target time unit;

[0303] The target time unit satisfies at least one of the following:

[0304] A symbol of a second reference signal closest to the last symbol of the second-stage sidelink control information SCI for suppressing phase noise in the second-stage SCI;

[0305] When the time domain density of the second reference signal is 1, the target time unit is the last symbol of the second-level SCI;

[0306] When the time domain density of the second reference signal is 2 or 4, and the last X symbols of the second-level SCI include the second reference signal or the physical side link shared channel demodulation reference signal PSSCH DMRS, the target time unit is the last symbol of the second-level SCI; X is an integer greater than 0;

[0307] When the time domain density of the second reference signal is 2 or 4, and the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, the target time unit is the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI, or the symbol of the nearest second reference signal after the last symbol of the second-level SCI, or the nearest PSSCH DMRS symbol after the last symbol of the second-level SCI;

[0308] When the time domain density of the second reference signal is 2 or 4, the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, and the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI is a symbol of the second reference signal, the target time unit is a symbol of the second reference signal;

[0309] When the time domain density of the second reference signal is 2 or 4, the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, and the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI is not a symbol of the second reference signal, the target time unit is the last symbol of the second-level SCI, or the target time unit is the nearest PSSCH DMRS symbol after the last symbol of the second-level SCI.

[0310] Optionally, the second time unit occupied by the first reference signal is M consecutive second time units that can be used to send the first reference signal in the first time unit, where M is an integer greater than or equal to 1.

[0311] Optionally, the M consecutive second time units include a second time unit for mapping the second reference signal.

[0312] Optionally, when the second reference signal exists and the first reference signal exists in the first time unit, the time domain density of the second reference signal is greater than or equal to the target time domain density; or, the level of the modulation coding mode of the PSSCH of the first time unit is less than or equal to the first MCS level.

[0313] Optionally, the first reference signal and the second reference signal are located in different second time units, including at least one of the following:

[0314] The first reference signal and the second reference signal are reference signals mapped to different second time units;

[0315] When the first reference signal and the second reference signal are mapped to the same second time unit, the first terminal discards the second reference signal or the first reference signal located in the second time unit.

[0316] Optionally, when the first reference signal and the second reference signal are reference signals mapped to different symbols, the second reference signal is a reference signal that skips the symbol of the first reference signal during mapping.

[0317] Optionally, the second reference signal is mapped in the following manner:

[0318] excluding the symbols of the first reference signal when determining the time index of the second reference signal mapping; or,

[0319] In a case where it is determined that there is symbol overlap between the second reference signal and the first reference signal during mapping, the time index of the second reference signal is re-determined with reference to a symbol following the first reference signal.

[0320] Optionally, when the first reference signal and the second reference signal are mapped to the same second time unit, the second reference signal does not include a symbol of the second reference signal as a target time unit and / or a symbol of the second reference signal before the target time unit; the target time unit satisfies at least one of the following:

[0321] A symbol of a second reference signal closest to the last symbol of the second-stage sidelink control information SCI for suppressing phase noise in the second-stage SCI;

[0322] When the time domain density of the second reference signal is 1, the target time unit is the last symbol of the second-level sidelink control information SCI;

[0323] When the time domain density of the second reference signal is 2 or 4, and the last X symbols of the second-level SCI include the second reference signal or the physical side link shared channel demodulation reference signal PSSCH DMRS, the target time unit is the last symbol of the second-level SCI; X is an integer greater than 0;

[0324] When the time domain density of the second reference signal is 2 or 4, and the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, the target time unit is the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI, or the symbol of the nearest second reference signal after the last symbol of the second-level SCI, or the nearest PSSCH DMRS symbol after the last symbol of the second-level SCI;

[0325] When the time domain density of the second reference signal is 2 or 4, the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, and the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI is a symbol of the second reference signal, the target time unit is a symbol of the second reference signal;

[0326] When the time domain density of the second reference signal is 2 or 4, the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, and the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI is not a symbol of the second reference signal, the target time unit is the last symbol of the second-level SCI, or the target time unit is the nearest PSSCH DMRS symbol after the last symbol of the second-level SCI.

[0327] Optionally, when the first reference signal and the second reference signal are reference signals mapped to different symbols, the maximum number of resources of the first reference signal is related to the second reference signal, including at least one of the following:

[0328] In the case where the second reference signal exists, the maximum number of resources of the first reference signal is a first number; in the case where the second reference signal does not exist, the maximum number of resources of the first reference signal is a second number; the first number is less than or equal to the second number;

[0329] The maximum number of resources of the first reference signal is related to the time domain density of the second reference signal; the greater the time domain density of the second reference signal, the greater the maximum number of resources of the first reference signal.

[0330] Optionally, when the first reference signal and the second reference signal are reference signals mapped to different symbols and the second reference signal exists, the first terminal does not send the 4-symbol first reference signal.

[0331] Optionally, the device further comprises:

[0332] a mapping module, configured to, if the second reference signal exists, map the first reference signal and the second reference signal using a first mapping manner according to a time domain density of the second reference signal, where the first mapping manner includes at least one of the following:

[0333] The first reference signal and the second reference signal are reference signals mapped to different second time units;

[0334] When the first reference signal and the second reference signal are mapped to the same second time unit, the terminal discards the second reference signal or the first reference signal located in the second time unit.

[0335] Optionally, when the time domain density of the second reference signal is less than a first target threshold, the first mapping mode is that, when the first reference signal and the second reference signal are mapped to the same second time unit, the terminal discards the second reference signal or the first reference signal located in the second time unit;

[0336] When the time domain density of the second reference signal is not less than a first target threshold, the first mapping manner is that the first reference signal and the second reference signal are reference signals mapped to different second time units.

[0337] Optionally, if the first reference signal and the second reference signal are located in different REs, at least one of the following is included:

[0338] The first reference signal and the second reference signal are reference signals mapped to different REs;

[0339] When the first reference signal and the second reference signal are mapped to the same RE, the first terminal discards the second reference signal or the first reference signal located in the RE.

[0340] Optionally, when the first reference signal and the second reference signal are mapped to the same RE, the second reference signal does not include a symbol of the second reference signal as a target time unit, or a symbol of the second reference signal before the target time unit; the target time unit satisfies at least one of the following:

[0341] A symbol of a second reference signal closest to the last symbol of the second-stage sidelink control information SCI for suppressing phase noise in the second-stage SCI;

[0342] When the time domain density of the second reference signal is 1, the target time unit is the last symbol of the second-level sidelink control information SCI;

[0343] When the time domain density of the second reference signal is 2 or 4, and the last X symbols of the second-level SCI include the second reference signal or the physical side link shared channel demodulation reference signal PSSCH DMRS, the target time unit is the last symbol of the second-level SCI; X is an integer greater than 0;

[0344] When the time domain density of the second reference signal is 2 or 4, and the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, the target time unit is the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI, or the symbol of the nearest second reference signal after the last symbol of the second-level SCI, or the nearest PSSCH DMRS symbol after the last symbol of the second-level SCI;

[0345] When the time domain density of the second reference signal is 2 or 4, the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, and the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI is a symbol of the second reference signal, the target time unit is a symbol of the second reference signal;

[0346] When the time domain density of the second reference signal is 2 or 4, the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, and the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI is not a symbol of the second reference signal, the target time unit is the last symbol of the second-level SCI, or the target time unit is the nearest PSSCH DMRS symbol after the last symbol of the second-level SCI.

[0347] Optionally, the mapping module is further configured to:

[0348] If the second reference signal exists, the first terminal maps the first reference signal and the second reference signal using a second mapping manner according to a frequency domain density of the first reference signal or the second reference signal, where the second mapping manner includes at least one of the following:

[0349] The first reference signal and the second reference signal are reference signals mapped to different REs;

[0350] When the first reference signal and the second reference signal are mapped to the same RE, the terminal discards the second reference signal or the first reference signal located in the RE.

[0351] Optionally, when the frequency domain density of the first reference signal or the second reference signal is less than a second target threshold, the second mapping mode is that, when the first reference signal and the second reference signal are mapped to the same RE, the terminal discards the second reference signal or the first reference signal located in the RE;

[0352] When the frequency domain density of the first reference signal or the second reference signal is not less than the second target threshold, the second mapping mode is that the first reference signal and the second reference signal are reference signals mapped to different REs.

[0353] Optionally, the apparatus further includes: a processing module, configured to discard a reference signal corresponding to a lower priority between the first reference signal and the second reference signal based on the priorities of the first reference signal and the second reference signal.

[0354] Optionally, when the first reference signal and the second reference signal are in the same second time unit, energy EPRE of each resource element of the first reference signal and the second reference signal in the second time unit satisfies one of the following:

[0355] The EPRE of the first reference signal and the second reference signal in the second time unit is the same;

[0356] The EPREs of the first reference signal and the second reference signal in the second time unit are calculated separately.

[0357] Optionally, when the EPREs of the first reference signal and the second reference signal in the second time unit are calculated separately, the EPRE of the first reference signal in the second time unit is obtained by uniformly distributing the REs occupied by the first reference signal according to the residual power; the residual power is the total power of the second time unit minus the power occupied by the second reference signal.

[0358] Optionally, the first reference signal or the second reference signal is a reference signal located in RE that has not been discarded.

[0359] Optionally, the mapping module is further configured to:

[0360] If the second reference signal exists, the first terminal maps the first reference signal and the second reference signal using a third mapping manner according to a frequency domain density of the first reference signal or the second reference signal, where the third mapping manner includes at least one of the following:

[0361] The first reference signal and the second reference signal are located in different second time units;

[0362] The first reference signal and the second reference signal are located in different resource elements RE.

[0363] Optionally, when the frequency domain density of the first reference signal or the second reference signal is less than a third target threshold, the third mapping manner is that the first reference signal and the second reference signal are located in different second time units;

[0364] When the frequency domain density of the first reference signal or the second reference signal is not less than a third target threshold, the third mapping manner is that the first reference signal and the second reference signal are located in different resource elements RE.

[0365] The device of this embodiment can be used to execute the method of any embodiment of the aforementioned first terminal side method embodiment. Its specific implementation process and technical effects are similar to those in the first terminal side method embodiment. For details, please refer to the detailed introduction in the first terminal side method embodiment, which will not be repeated here.

[0366] FIG6 is a schematic diagram of a structure of a signal receiving device provided in an embodiment of the present application. As shown in FIG6 , the signal receiving device provided in this embodiment includes:

[0367] A receiving module 610 is configured to receive a first reference signal and a second reference signal of a side link SL sent by a first terminal in the same first time unit; the first time unit belongs to a shared resource pool;

[0368] The first reference signal and the second reference signal are located in different second time units, or the first reference signal and the second reference signal are located in different resource elements RE; and the size of the second time unit is smaller than the size of the first time unit.

[0369] Optionally, the first reference signal is sent after a target time unit;

[0370] The target time unit satisfies at least one of the following:

[0371] A symbol of a second reference signal closest to the last symbol of the second-stage sidelink control information SCI for suppressing phase noise in the second-stage SCI;

[0372] When the time domain density of the second reference signal is 1, the target time unit is the last symbol of the second-level sidelink control information SCI;

[0373] When the time domain density of the second reference signal is 2 or 4, and the last X symbols of the second-level SCI include the second reference signal or the physical side link shared channel demodulation reference signal PSSCH DMRS, the target time unit is the last symbol of the second-level SCI; X is an integer greater than 0;

[0374] When the time domain density of the second reference signal is 2 or 4, and the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, the target time unit is the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI, or the symbol of the nearest second reference signal after the last symbol of the second-level SCI, or the nearest PSSCH DMRS symbol after the last symbol of the second-level SCI;

[0375] When the time domain density of the second reference signal is 2 or 4, the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, and the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI is a symbol of the second reference signal, the target time unit is a symbol of the second reference signal;

[0376] When the time domain density of the second reference signal is 2 or 4, the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, and the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI is not a symbol of the second reference signal, the target time unit is the last symbol of the second-level SCI, or the target time unit is the nearest PSSCH DMRS symbol after the last symbol of the second-level SCI.

[0377] Optionally, the second time unit occupied by the first reference signal is M consecutive second time units that can be used to send the first reference signal in the first time unit, where M is an integer greater than or equal to 1.

[0378] Optionally, the M consecutive second time units include a second time unit for mapping the second reference signal.

[0379] Optionally, when the second reference signal exists and the first reference signal exists in the first time unit, the time domain density of the second reference signal is greater than or equal to the target time domain density; or, the level of the modulation coding mode of the PSSCH of the first time unit is less than or equal to the first MCS level.

[0380] Optionally, the first reference signal and the second reference signal are located in different second time units, including at least one of the following:

[0381] The second terminal does not expect the first reference signal and the second reference signal to be mapped to the same second time unit;

[0382] When the first reference signal and the second reference signal are mapped to the same second time unit, the second terminal does not expect to receive the second reference signal, but expects to receive the first reference signal; or, the second terminal does not expect to receive the first reference signal, but expects to receive the second reference signal.

[0383] Optionally, when the second terminal does not expect the first reference signal and the second reference signal to be mapped to the same symbol, the second reference signal is a reference signal that skips the symbol of the first reference signal during mapping.

[0384] Optionally, when the first reference signal and the second reference signal are mapped to the same second time unit, the second reference signal does not include a symbol of the second reference signal as a target time unit and / or a symbol of the second reference signal before the target time unit; the target time unit satisfies at least one of the following:

[0385] A symbol of a second reference signal closest to the last symbol of the second-stage sidelink control information SCI for suppressing phase noise in the second-stage SCI;

[0386] When the time domain density of the second reference signal is 1, the target time unit is the last symbol of the second-level sidelink control information SCI;

[0387] When the time domain density of the second reference signal is 2 or 4, and the last X symbols of the second-level SCI include the second reference signal or the physical side link shared channel demodulation reference signal PSSCH DMRS, the target time unit is the last symbol of the second-level SCI; X is an integer greater than 0;

[0388] When the time domain density of the second reference signal is 2 or 4, and the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, the target time unit is the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI, or the symbol of the nearest second reference signal after the last symbol of the second-level SCI, or the nearest PSSCH DMRS symbol after the last symbol of the second-level SCI;

[0389] When the time domain density of the second reference signal is 2 or 4, the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, and the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI is a symbol of the second reference signal, the target time unit is a symbol of the second reference signal;

[0390] When the time domain density of the second reference signal is 2 or 4, the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, and the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI is not a symbol of the second reference signal, the target time unit is the last symbol of the second-level SCI, or the target time unit is the nearest PSSCH DMRS symbol after the last symbol of the second-level SCI.

[0391] Optionally, when the second terminal does not expect the first reference signal and the second reference signal to be mapped to the same second time unit, the maximum number of resources of the first reference signal is related to the second reference signal, including at least one of the following:

[0392] In the case where the second reference signal exists, the maximum number of resources of the first reference signal is a first number; in the case where the second reference signal does not exist, the maximum number of resources of the first reference signal is a second number; the first number is less than or equal to the second number;

[0393] The maximum number of resources of the first reference signal is related to the time domain density of the second reference signal; the greater the time domain density of the second reference signal, the greater the maximum number of resources of the first reference signal.

[0394] Optionally, the receiving module 610 is specifically configured to:

[0395] If the second reference signal exists, the first reference signal and the second reference signal are received using a first receiving mode according to a time domain density of the second reference signal, where the first receiving mode includes at least one of the following:

[0396] The second terminal does not expect the first reference signal and the second reference signal to be mapped to the same second time unit;

[0397] When the first reference signal and the second reference signal are mapped to the same second time unit, the second terminal does not expect to receive the second reference signal, but expects to receive the first reference signal; or, the second terminal does not expect to receive the first reference signal, but expects to receive the second reference signal.

[0398] Optionally, when the time domain density of the second reference signal is less than a first target threshold, the first receiving mode is that, when the first reference signal and the second reference signal are mapped to the same second time unit, the second terminal does not expect to receive the second reference signal, but expects to receive the first reference signal; or, the second terminal does not expect to receive the first reference signal, but expects to receive the second reference signal.

[0399] When the time domain density of the second reference signal is not less than a first target threshold, the first receiving mode is that the second terminal does not expect the first reference signal and the second reference signal to be mapped to the same second time unit.

[0400] Optionally, the first reference signal and the second reference signal are located in different resource elements RE, including at least one of the following:

[0401] The second terminal does not expect the first reference signal and the second reference signal to be mapped to the same RE;

[0402] When the first reference signal and the second reference signal are mapped to the same RE, the second terminal does not expect to receive the second reference signal, but expects to receive the first reference signal; or, the second terminal does not expect to receive the first reference signal, but expects to receive the second reference signal.

[0403] Optionally, when the first reference signal and the second reference signal are mapped to the same RE, the second reference signal does not include a symbol of the second reference signal as a target time unit and / or a symbol of the second reference signal before the target time unit; the target time unit satisfies at least one of the following:

[0404] A symbol of a second reference signal closest to the last symbol of the second-stage sidelink control information SCI for suppressing phase noise in the second-stage SCI;

[0405] When the time domain density of the second reference signal is 1, the target time unit is the last symbol of the second-level sidelink control information SCI;

[0406] When the time domain density of the second reference signal is 2 or 4, and the last X symbols of the second-level SCI include the second reference signal or the physical side link shared channel demodulation reference signal PSSCH DMRS, the target time unit is the last symbol of the second-level SCI; X is an integer greater than 0;

[0407] When the time domain density of the second reference signal is 2 or 4, and the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, the target time unit is the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI, or the symbol of the nearest second reference signal after the last symbol of the second-level SCI, or the nearest PSSCH DMRS symbol after the last symbol of the second-level SCI;

[0408] When the time domain density of the second reference signal is 2 or 4, the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, and the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI is a symbol of the second reference signal, the target time unit is a symbol of the second reference signal;

[0409] When the time domain density of the second reference signal is 2 or 4, the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, and the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI is not a symbol of the second reference signal, the target time unit is the last symbol of the second-level SCI, or the target time unit is the nearest PSSCH DMRS symbol after the last symbol of the second-level SCI.

[0410] Optionally, the receiving module 610 is specifically configured to:

[0411] If the second reference signal exists, the second terminal receives the first reference signal and the second reference signal in a second receiving mode according to a frequency domain density of the first reference signal or the second reference signal, where the second receiving mode includes at least one of the following:

[0412] The second terminal does not expect the first reference signal and the second reference signal to be mapped to the same RE;

[0413] When the first reference signal and the second reference signal are mapped to the same RE, the second terminal does not expect to receive the second reference signal, but expects to receive the first reference signal; or, the second terminal does not expect to receive the first reference signal, but expects to receive the second reference signal.

[0414] Optionally, when the frequency domain density of the first reference signal or the second reference signal is less than a second target threshold, the second reception mode is that, when the first reference signal and the second reference signal are mapped to the same RE, the second terminal does not expect to receive the second reference signal, but expects to receive the first reference signal; or, the second terminal does not expect to receive the first reference signal, but expects to receive the second reference signal;

[0415] When the frequency domain density of the first reference signal or the second reference signal is not less than the second target threshold, the second receiving mode is that the second terminal does not expect the first reference signal and the second reference signal to be mapped to the same RE.

[0416] Optionally, when the first reference signal and the second reference signal are in the same second time unit, energy EPRE of each resource element of the first reference signal and the second reference signal in the second time unit satisfies one of the following:

[0417] The EPRE of the first reference signal and the second reference signal in the second time unit is the same;

[0418] The EPREs of the first reference signal and the second reference signal in the second time unit are calculated separately.

[0419] Optionally, when the EPREs of the first reference signal and the second reference signal in the second time unit are calculated separately, the EPRE of the first reference signal in the second time unit is obtained by uniformly distributing the REs occupied by the first reference signal according to the residual power; the residual power is the total power of the second time unit minus the power occupied by the second reference signal.

[0420] Optionally, the first reference signal or the second reference signal is a reference signal located in RE that has not been discarded.

[0421] Optionally, the receiving module 610 is specifically configured to:

[0422] If the second reference signal exists, the second terminal receives the first reference signal and the second reference signal in a third receiving mode according to a frequency domain density of the first reference signal or the second reference signal, where the third receiving mode includes at least one of the following:

[0423] The second terminal expects to receive a first reference signal and a second reference signal located in different second time units;

[0424] The second terminal expects to receive a first reference signal and a second reference signal located in different resource elements RE.

[0425] Optionally, when the frequency domain density of the first reference signal or the second reference signal is less than a third target threshold, the third receiving mode is that the second terminal expects to receive the first reference signal and the second reference signal in different second time units;

[0426] When the frequency domain density of the first reference signal or the second reference signal is not less than the third target threshold, the third receiving mode is that the second terminal expects to receive the first reference signal and the second reference signal located in different resource elements RE.

[0427] The device of this embodiment can be used to execute the method of any embodiment of the aforementioned second terminal side method embodiment. Its specific implementation process and technical effects are similar to those in the second terminal side method embodiment. For details, please refer to the detailed introduction in the second terminal side method embodiment, which will not be repeated here.

[0428] The signal transmitting device and the signal receiving device in the embodiments of the present application can be electronic devices, such as electronic devices with an operating system, or components in electronic devices, such as integrated circuits or chips. The electronic device can be a terminal or other devices other than a terminal. For example, the terminal can include but is not limited to the types of terminal 11 listed above, and other devices can be servers, network attached storage (NAS), etc., which are not specifically limited in the embodiments of the present application.

[0429] The signal sending device and signal receiving device provided in the embodiments of the present application can implement the various processes implemented in the method embodiments of Figures 3 to 4 and achieve the same technical effects. To avoid repetition, they will not be described here.

[0430] As shown in Figure 7, an embodiment of the present application further provides a communication device 700, including a processor 701 and a memory 702. The memory 702 stores a program or instruction that can be run on the processor 701. For example, when the communication device 700 is a first terminal, the program or instruction is executed by the processor 701 to implement the various steps of the above-mentioned signal transmission method embodiment and can achieve the same technical effect. When the communication device 700 is a second terminal, the program or instruction is executed by the processor 701 to implement the various steps of the above-mentioned signal reception method embodiment and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0431] The embodiment of the present application also provides a first terminal, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement the steps in the method embodiment shown in Figure XXX. This first terminal embodiment corresponds to the above-mentioned first terminal side method embodiment, and each implementation process and implementation method of the above-mentioned method embodiment can be applied to the first terminal embodiment and can achieve the same technical effect. Specifically, Figure 8 is a schematic diagram of the hardware structure of a terminal that implements an embodiment of the present application. The terminal 800 includes but is not limited to: a radio frequency unit 801, a network module 802, an audio output unit 803, an input unit 804, a sensor 805, a display unit 806, a user input unit 807, an interface unit 808, a memory 809, and at least some of the components of the processor 810.

[0432] Those skilled in the art will appreciate that the terminal 800 may also include a power supply (such as a battery) to power various components. The power supply may be logically connected to the processor 810 via a power management system, thereby enabling the power management system to manage charging, discharging, and power consumption. The terminal structure shown in FIG8 does not limit the terminal. The terminal may include more or fewer components than shown, or may combine certain components, or have different component arrangements, which will not be described in detail here.

[0433] It should be understood that in an embodiment of the present application, the input unit 804 may include a graphics processing unit (GPU) 8041 and a microphone 8042, and the graphics processor 8041 processes the image data of a static picture or video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 806 may include a display panel 8061, and the display panel 8061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 807 includes a touch panel 8071 and at least one of other input devices 8072. The touch panel 8071 is also called a touch screen. The touch panel 8071 may include two parts: a touch detection device and a touch controller. Other input devices 8072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, and an operating stick, which will not be repeated here.

[0434] In the embodiment of the present application, after receiving downlink data from a network-side device, the radio frequency unit 801 may transmit the data to the processor 810 for processing. Furthermore, the radio frequency unit 801 may send uplink data to the network-side device. Typically, the radio frequency unit 801 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low-noise amplifier, a duplexer, and the like.

[0435] The memory 809 can be used to store software programs or instructions and various data. The memory 809 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, applications or instructions required for at least one function (such as a sound playback function, an image playback function, etc.). In addition, the memory 809 may include a volatile memory or a non-volatile memory. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be random access memory (RAM), static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct RAM bus random access memory (DRRAM). The memory 809 in the embodiment of the present application includes but is not limited to these and any other suitable types of memory.

[0436] Processor 810 may include one or more processing units. Optionally, processor 810 integrates an application processor and a modem processor. The application processor primarily handles operations related to the operating system, user interface, and application programs, while the modem processor primarily processes wireless communication signals, such as a baseband processor. It is understood that the modem processor may not be integrated into processor 810.

[0437] The radio frequency unit 801 is configured to send a first reference signal and a second reference signal of the side link SL in the same first time unit; the first time unit belongs to a shared resource pool;

[0438] The first reference signal and the second reference signal are located in different second time units, or the first reference signal and the second reference signal are located in different resource elements RE; and the size of the second time unit is smaller than the size of the first time unit.

[0439] Optionally, the first reference signal is sent after a target time unit;

[0440] The target time unit satisfies at least one of the following:

[0441] A symbol of a second reference signal closest to the last symbol of the second-stage sidelink control information SCI for suppressing phase noise in the second-stage SCI;

[0442] When the time domain density of the second reference signal is 1, the target time unit is the last symbol of the second-level SCI;

[0443] When the time domain density of the second reference signal is 2 or 4, and the last X symbols of the second-level SCI include the second reference signal or the physical side link shared channel demodulation reference signal PSSCH DMRS, the target time unit is the last symbol of the second-level SCI; X is an integer greater than 0;

[0444] When the time domain density of the second reference signal is 2 or 4, and the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, the target time unit is the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI, or the symbol of the nearest second reference signal after the last symbol of the second-level SCI, or the nearest PSSCH DMRS symbol after the last symbol of the second-level SCI;

[0445] When the time domain density of the second reference signal is 2 or 4, the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, and the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI is a symbol of the second reference signal, the target time unit is a symbol of the second reference signal;

[0446] When the time domain density of the second reference signal is 2 or 4, the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, and the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI is not a symbol of the second reference signal, the target time unit is the last symbol of the second-level SCI, or the target time unit is the nearest PSSCH DMRS symbol after the last symbol of the second-level SCI.

[0447] Optionally, the second time unit occupied by the first reference signal is M consecutive second time units that can be used to send the first reference signal in the first time unit, where M is an integer greater than or equal to 1.

[0448] Optionally, the M consecutive second time units include a second time unit for mapping the second reference signal.

[0449] Optionally, when the second reference signal exists and the first reference signal exists in the first time unit, the time domain density of the second reference signal is greater than or equal to the target time domain density; or, the level of the modulation coding mode of the PSSCH of the first time unit is less than or equal to the first MCS level.

[0450] Optionally, the first reference signal and the second reference signal are located in different second time units, including at least one of the following:

[0451] The first reference signal and the second reference signal are reference signals mapped to different second time units;

[0452] When the first reference signal and the second reference signal are mapped to the same second time unit, the first terminal discards the second reference signal or the first reference signal located in the second time unit.

[0453] Optionally, when the first reference signal and the second reference signal are reference signals mapped to different symbols, the second reference signal is a reference signal that skips the symbol of the first reference signal during mapping.

[0454] Optionally, the second reference signal is mapped in the following manner:

[0455] excluding the symbols of the first reference signal when determining the time index of the second reference signal mapping; or,

[0456] In a case where it is determined that there is symbol overlap between the second reference signal and the first reference signal during mapping, the time index of the second reference signal is re-determined with reference to a symbol following the first reference signal.

[0457] Optionally, when the first reference signal and the second reference signal are mapped to the same second time unit, the second reference signal does not include a symbol of the second reference signal as a target time unit and / or a symbol of the second reference signal before the target time unit; the target time unit satisfies at least one of the following:

[0458] A symbol of a second reference signal closest to the last symbol of the second-stage sidelink control information SCI for suppressing phase noise in the second-stage SCI;

[0459] When the time domain density of the second reference signal is 1, the target time unit is the last symbol of the second-level sidelink control information SCI;

[0460] When the time domain density of the second reference signal is 2 or 4, and the last X symbols of the second-level SCI include the second reference signal or the physical side link shared channel demodulation reference signal PSSCH DMRS, the target time unit is the last symbol of the second-level SCI; X is an integer greater than 0;

[0461] When the time domain density of the second reference signal is 2 or 4, and the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, the target time unit is the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI, or the symbol of the nearest second reference signal after the last symbol of the second-level SCI, or the nearest PSSCH DMRS symbol after the last symbol of the second-level SCI;

[0462] When the time domain density of the second reference signal is 2 or 4, the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, and the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI is a symbol of the second reference signal, the target time unit is a symbol of the second reference signal;

[0463] When the time domain density of the second reference signal is 2 or 4, the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, and the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI is not a symbol of the second reference signal, the target time unit is the last symbol of the second-level SCI, or the target time unit is the nearest PSSCH DMRS symbol after the last symbol of the second-level SCI.

[0464] Optionally, when the first reference signal and the second reference signal are reference signals mapped to different symbols, the maximum number of resources of the first reference signal is related to the second reference signal, including at least one of the following:

[0465] In the case where the second reference signal exists, the maximum number of resources of the first reference signal is a first number; in the case where the second reference signal does not exist, the maximum number of resources of the first reference signal is a second number; the first number is less than or equal to the second number;

[0466] The maximum number of resources of the first reference signal is related to the time domain density of the second reference signal; the greater the time domain density of the second reference signal, the greater the maximum number of resources of the first reference signal.

[0467] Optionally, when the first reference signal and the second reference signal are reference signals mapped to different symbols and the second reference signal exists, the first terminal does not send the 4-symbol first reference signal.

[0468] Optionally, the processor 810 is configured to, if the second reference signal exists, map the first reference signal and the second reference signal in a first mapping manner according to a time domain density of the second reference signal, where the first mapping manner includes at least one of the following:

[0469] The first reference signal and the second reference signal are reference signals mapped to different second time units;

[0470] When the first reference signal and the second reference signal are mapped to the same second time unit, the terminal discards the second reference signal or the first reference signal located in the second time unit.

[0471] Optionally, when the time domain density of the second reference signal is less than a first target threshold, the first mapping mode is that, when the first reference signal and the second reference signal are mapped to the same second time unit, the terminal discards the second reference signal or the first reference signal located in the second time unit;

[0472] When the time domain density of the second reference signal is not less than a first target threshold, the first mapping manner is that the first reference signal and the second reference signal are reference signals mapped to different second time units.

[0473] Optionally, if the first reference signal and the second reference signal are located in different REs, at least one of the following is included:

[0474] The first reference signal and the second reference signal are reference signals mapped to different REs;

[0475] When the first reference signal and the second reference signal are mapped to the same RE, the first terminal discards the second reference signal or the first reference signal located in the RE.

[0476] Optionally, when the first reference signal and the second reference signal are mapped to the same RE, the second reference signal does not include a symbol of the second reference signal as a target time unit, or a symbol of the second reference signal before the target time unit; the target time unit satisfies at least one of the following:

[0477] A symbol of a second reference signal closest to the last symbol of the second-stage sidelink control information SCI for suppressing phase noise in the second-stage SCI;

[0478] When the time domain density of the second reference signal is 1, the target time unit is the last symbol of the second-level sidelink control information SCI;

[0479] When the time domain density of the second reference signal is 2 or 4, and the last X symbols of the second-level SCI include the second reference signal or the physical side link shared channel demodulation reference signal PSSCH DMRS, the target time unit is the last symbol of the second-level SCI; X is an integer greater than 0;

[0480] When the time domain density of the second reference signal is 2 or 4, and the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, the target time unit is the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI, or the symbol of the nearest second reference signal after the last symbol of the second-level SCI, or the nearest PSSCH DMRS symbol after the last symbol of the second-level SCI;

[0481] When the time domain density of the second reference signal is 2 or 4, the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, and the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI is a symbol of the second reference signal, the target time unit is a symbol of the second reference signal;

[0482] When the time domain density of the second reference signal is 2 or 4, the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, and the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI is not a symbol of the second reference signal, the target time unit is the last symbol of the second-level SCI, or the target time unit is the nearest PSSCH DMRS symbol after the last symbol of the second-level SCI.

[0483] Optionally, the processor 810 is further configured to:

[0484] If the second reference signal exists, the first terminal maps the first reference signal and the second reference signal using a second mapping manner according to a frequency domain density of the first reference signal or the second reference signal, where the second mapping manner includes at least one of the following:

[0485] The first reference signal and the second reference signal are reference signals mapped to different REs;

[0486] When the first reference signal and the second reference signal are mapped to the same RE, the terminal discards the second reference signal or the first reference signal located in the RE.

[0487] Optionally, when the frequency domain density of the first reference signal or the second reference signal is less than a second target threshold, the second mapping mode is that, when the first reference signal and the second reference signal are mapped to the same RE, the terminal discards the second reference signal or the first reference signal located in the RE;

[0488] When the frequency domain density of the first reference signal or the second reference signal is not less than the second target threshold, the second mapping mode is that the first reference signal and the second reference signal are reference signals mapped to different REs.

[0489] Optionally, the processor 810 is further configured to discard a reference signal corresponding to a lower priority between the first reference signal and the second reference signal based on the priorities of the first reference signal and the second reference signal.

[0490] Optionally, when the first reference signal and the second reference signal are in the same second time unit, energy EPRE of each resource element of the first reference signal and the second reference signal in the second time unit satisfies one of the following:

[0491] The EPRE of the first reference signal and the second reference signal in the second time unit is the same;

[0492] The EPREs of the first reference signal and the second reference signal in the second time unit are calculated separately.

[0493] Optionally, when the EPREs of the first reference signal and the second reference signal in the second time unit are calculated separately, the EPRE of the first reference signal in the second time unit is obtained by uniformly distributing the REs occupied by the first reference signal according to the residual power; the residual power is the total power of the second time unit minus the power occupied by the second reference signal.

[0494] Optionally, the first reference signal or the second reference signal is a reference signal located in RE that has not been discarded.

[0495] Optionally, the processor 810 is further configured to:

[0496] If the second reference signal exists, the first terminal maps the first reference signal and the second reference signal using a third mapping manner according to a frequency domain density of the first reference signal or the second reference signal, where the third mapping manner includes at least one of the following:

[0497] The first reference signal and the second reference signal are located in different second time units;

[0498] The first reference signal and the second reference signal are located in different resource elements RE.

[0499] Optionally, when the frequency domain density of the first reference signal or the second reference signal is less than a third target threshold, the third mapping manner is that the first reference signal and the second reference signal are located in different second time units;

[0500] When the frequency domain density of the first reference signal or the second reference signal is not less than a third target threshold, the third mapping manner is that the first reference signal and the second reference signal are located in different resource elements RE.

[0501] It can be understood that the implementation process of each implementation method mentioned in this embodiment can refer to the relevant description of any method embodiment of the aforementioned first terminal side, and achieve the same or corresponding technical effect. To avoid repetition, it will not be repeated here.

[0502] Optionally, the second terminal may also be implemented using the structure shown in FIG8 , which will not be described in detail here.

[0503] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the various processes of the above-mentioned signal sending method or signal receiving method embodiment are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0504] The processor is the processor in the terminal described in the above embodiment. The readable storage medium includes a computer-readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk. In some examples, the readable storage medium may be a non-transitory readable storage medium.

[0505] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned signal sending method or signal receiving method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0506] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0507] An embodiment of the present application further provides a computer program / program product, which is stored in a storage medium. The computer program / program product is executed by at least one processor to implement the various processes of the above-mentioned signal sending method or signal receiving method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0508] An embodiment of the present application further provides a communication system, including: a first terminal and a second terminal, wherein the first terminal can be used to execute the steps of the signal sending method described above, and the second terminal can be used to execute the steps of the signal receiving method described above.

[0509] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0510] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of a computer software product plus a necessary general-purpose hardware platform, or of course, by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, magnetic disk, optical disk, etc.) and includes a number of instructions for enabling a terminal or network-side device to execute the methods described in each embodiment of the present application.

[0511] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms of implementation methods without departing from the purpose of this application and the scope of protection of the claims. These implementation methods are all within the protection of this application.

Claims

1. A signal transmission method, wherein: include: The first terminal sends the first reference signal and the second reference signal of the side link SL in the same first time unit; The first time unit belongs to a shared resource pool; The first reference signal and the second reference signal are located in different second time units, or the first reference signal and the second reference signal are located in different resource elements RE; and the size of the second time unit is smaller than the size of the first time unit.

2. The signal transmission method according to claim 1, wherein: The first reference signal is sent after a target time unit; The target time unit satisfies at least one of the following: A symbol of a second reference signal closest to the last symbol of the second-level sidelink control information SCI for suppressing phase noise in the second-level SCI; When the time domain density of the second reference signal is 1, the target time unit is the last symbol of the second-level SCI; When the time domain density of the second reference signal is 2 or 4, and the last X symbols of the second-level SCI include the second reference signal or the physical side link shared channel demodulation reference signal PSSCH DMRS, the target time unit is the last symbol of the second-level SCI; X is an integer greater than 0; When the time domain density of the second reference signal is 2 or 4, and the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, the target time unit is the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI, or the symbol of the nearest second reference signal after the last symbol of the second-level SCI, or the nearest PSSCH DMRS symbol after the last symbol of the second-level SCI; When the time domain density of the second reference signal is 2 or 4, the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, and the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI is a symbol of the second reference signal, the target time unit is a symbol of the second reference signal; When the time domain density of the second reference signal is 2 or 4, the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, and the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI is not a symbol of the second reference signal, the target time unit is the last symbol of the second-level SCI, or the target time unit is the nearest PSSCH DMRS symbol after the last symbol of the second-level SCI.

3. The signal transmission method according to claim 1 or 2, wherein: The second time unit occupied by the first reference signal is M consecutive second time units that can be finally used for sending the first reference signal within the first time unit, where M is an integer greater than or equal to 1.

4. The signal transmission method according to claim 1 or 2, wherein: When the second reference signal exists and the first reference signal exists in the first time unit, the time domain density of the second reference signal is greater than or equal to the target time domain density; or, the level of the modulation coding mode of the PSSCH of the first time unit is less than or equal to the first MCS level.

5. The signal sending method according to any one of claims 1 to 4, wherein: The first reference signal and the second reference signal are located in different second time units, including at least one of the following: The first reference signal and the second reference signal are reference signals mapped to different second time units; When the first reference signal and the second reference signal are mapped to the same second time unit, the first terminal discards the second reference signal or the first reference signal located in the second time unit.

6. The signal transmission method according to claim 5, wherein: When the first reference signal and the second reference signal are reference signals mapped to different symbols, the second reference signal is a reference signal in which symbols of the first reference signal are skipped during mapping.

7. The signal transmission method according to claim 6, wherein: The second reference signal is mapped in the following manner: excluding the symbol of the first reference signal when determining the time index of the second reference signal mapping; or, In the case where it is determined that there is symbol overlap between the second reference signal and the first reference signal during mapping, the time index of the second reference signal is re-determined with reference to a symbol after the first reference signal.

8. The signal transmission method according to claim 5, wherein: In the case where the first reference signal and the second reference signal are mapped to the same second time unit, the second reference signal does not include a symbol of the second reference signal as a target time unit and / or a symbol of the second reference signal before the target time unit; the target time unit satisfies at least one of the following: A symbol of a second reference signal closest to the last symbol of the second-level sidelink control information SCI for suppressing phase noise in the second-level SCI; When the time domain density of the second reference signal is 1, the target time unit is the last symbol of the second-level sidelink control information SCI; When the time domain density of the second reference signal is 2 or 4, and the last X symbols of the second-level SCI include the second reference signal or the physical side link shared channel demodulation reference signal PSSCH DMRS, the target time unit is the last symbol of the second-level SCI; X is an integer greater than 0; When the time domain density of the second reference signal is 2 or 4, and the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, the target time unit is the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI, or the symbol of the nearest second reference signal after the last symbol of the second-level SCI, or the nearest PSSCH DMRS symbol after the last symbol of the second-level SCI; When the time domain density of the second reference signal is 2 or 4, the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, and the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI is a symbol of the second reference signal, the target time unit is a symbol of the second reference signal; When the time domain density of the second reference signal is 2 or 4, the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, and the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI is not a symbol of the second reference signal, the target time unit is the last symbol of the second-level SCI, or the target time unit is the nearest PSSCH DMRS symbol after the last symbol of the second-level SCI.

9. The signal transmission method according to claim 5, wherein: In a case where the first reference signal and the second reference signal are reference signals mapped to different symbols, the maximum number of resources of the first reference signal is related to the second reference signal, including at least one of the following: In the case where the second reference signal exists, the maximum number of resources of the first reference signal is a first number; in the case where the second reference signal does not exist, the maximum number of resources of the first reference signal is a second number; the first number is less than or equal to the second number; The maximum number of resources of the first reference signal is related to the time domain density of the second reference signal; the greater the time domain density of the second reference signal, the greater the maximum number of resources of the first reference signal.

10. The signal transmission method according to claim 5, wherein: The method further comprises: If the second reference signal exists, the first terminal maps the first reference signal and the second reference signal in a first mapping manner according to the time domain density of the second reference signal, where the first mapping manner includes at least one of the following: The first reference signal and the second reference signal are reference signals mapped to different second time units; When the first reference signal and the second reference signal are mapped to the same second time unit, the terminal discards the second reference signal or the first reference signal located in the second time unit.

11. The signal transmission method according to claim 10, wherein: When the time domain density of the second reference signal is less than the first target threshold, the first mapping mode is that when the first reference signal and the second reference signal are mapped to the same second time unit, the terminal discards the second reference signal or the first reference signal located in the second time unit; When the time domain density of the second reference signal is not less than the first target threshold, the first mapping manner is that the first reference signal and the second reference signal are reference signals mapped to different second time units.

12. The signal sending method according to any one of claims 1 to 4, wherein: If the first reference signal and the second reference signal are located in different REs, at least one of the following is included: The first reference signal and the second reference signal are reference signals mapped on different REs; When the first reference signal and the second reference signal are mapped to the same RE, the first terminal discards the second reference signal or the first reference signal located in the RE.

13. The signal transmission method according to claim 12, wherein: In the case where the first reference signal and the second reference signal are mapped to the same RE, the second reference signal does not include a symbol of the second reference signal as a target time unit, or a symbol of the second reference signal before the target time unit; the target time unit satisfies at least one of the following: The last symbol of the second-level sidelink control information SCI is used to suppress the phase noise in the second-level SCI. the sign of the second reference signal; When the time domain density of the second reference signal is 1, the target time unit is the last symbol of the second-level sidelink control information SCI; When the time domain density of the second reference signal is 2 or 4, and the last X symbols of the second-level SCI include the second reference signal or the physical side link shared channel demodulation reference signal PSSCH DMRS, the target time unit is the last symbol of the second-level SCI; X is an integer greater than 0; When the time domain density of the second reference signal is 2 or 4, and the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, the target time unit is the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI, or the symbol of the nearest second reference signal after the last symbol of the second-level SCI, or the nearest PSSCH DMRS symbol after the last symbol of the second-level SCI; When the time domain density of the second reference signal is 2 or 4, the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, and the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI is a symbol of the second reference signal, the target time unit is a symbol of the second reference signal; When the time domain density of the second reference signal is 2 or 4, the last X symbols of the second-level SCI do not include the second reference signal and the PSSCH DMRS, and the nearest symbol of the second reference signal and the PSSCH DMRS after the last symbol of the second-level SCI is not a symbol of the second reference signal, the target time unit is the last symbol of the second-level SCI, or the target time unit is the nearest PSSCH DMRS symbol after the last symbol of the second-level SCI.

14. The signal transmission method according to claim 12, wherein: The method further comprises: If the second reference signal exists, the first terminal maps the first reference signal and the second reference signal in a second mapping manner according to a frequency domain density of the first reference signal or the second reference signal, where the second mapping manner includes at least one of the following: The first reference signal and the second reference signal are reference signals mapped on different REs; When the first reference signal and the second reference signal are mapped to the same RE, the terminal discards the second reference signal or the first reference signal located in the RE.

15. The signal transmission method according to claim 14, wherein: When the frequency domain density of the first reference signal or the second reference signal is less than a second target threshold, the second mapping mode is that when the first reference signal and the second reference signal are mapped to the same RE, the terminal discards the second reference signal or the first reference signal located in the RE; When the frequency domain density of the first reference signal or the second reference signal is not less than the second target threshold, the second mapping mode is that the first reference signal and the second reference signal are reference signals mapped to different REs.

16. The signal transmission method according to any one of claims 1 to 4 or 12, wherein: When the first reference signal and the second reference signal are in the same second time unit, the energy EPRE of each resource element of the first reference signal and the second reference signal in the second time unit satisfies Next item: The EPRE of the first reference signal and the second reference signal in the second time unit is the same; The EPREs of the first reference signal and the second reference signal in the second time unit are calculated separately.

17. The signal transmission method according to claim 16, wherein: When the EPREs of the first reference signal and the second reference signal in the second time unit are calculated separately, the EPRE of the first reference signal in the second time unit is obtained by uniformly distributing the REs occupied by the first reference signal according to the remaining power; the remaining power is the total power of the second time unit minus the power occupied by the second reference signal.

18. The signal sending method according to any one of claims 1 to 17, wherein: The method further comprises: If the second reference signal exists, the first terminal maps the first reference signal and the second reference signal in a third mapping manner according to a frequency domain density of the first reference signal or the second reference signal, where the third mapping manner includes at least one of the following: The first reference signal and the second reference signal are located in different second time units; The first reference signal and the second reference signal are located in different resource elements RE.

19. The signal transmission method according to claim 18, wherein: When the frequency domain density of the first reference signal or the second reference signal is less than a third target threshold, the third mapping mode is that the first reference signal and the second reference signal are located in different second time units; When the frequency domain density of the first reference signal or the second reference signal is not less than the third target threshold, the third mapping manner is that the first reference signal and the second reference signal are located in different resource elements RE.

20. A signal receiving method, wherein: include: The second terminal receives a first reference signal and a second reference signal of the side link SL sent by the first terminal in the same first time unit; The first time unit belongs to a shared resource pool; The first reference signal and the second reference signal are located in different second time units, or the first reference signal and the second reference signal are located in different resource elements RE; and the size of the second time unit is smaller than the size of the first time unit.

21. The signal receiving method according to claim 20, wherein: The first reference signal and the second reference signal are located in different second time units, including at least one of the following: The second terminal does not expect the first reference signal and the second reference signal to be mapped in the same second time unit; In a case where the first reference signal and the second reference signal are mapped to the same second time unit, the second terminal does not expect to receive the second reference signal, and the second terminal expects to receive the first reference signal; Or, the second terminal does not expect to receive the first reference signal, and the second terminal expects to receive the second reference signal.

22. The signal receiving method according to claim 21, wherein: In a case where the second terminal does not expect the first reference signal and the second reference signal to be mapped in the same second time unit, the maximum number of resources of the first reference signal is related to the second reference signal, including at least one of the following: In the case where the second reference signal exists, the maximum number of resources of the first reference signal is the first number; in the case where the second reference signal does not exist, the maximum number of resources of the first reference signal is the second number; The first number is less than or equal to the second number; The maximum number of resources of the first reference signal is related to the time domain density of the second reference signal; the greater the time domain density of the second reference signal, the greater the maximum number of resources of the first reference signal.

23. The signal receiving method according to claim 21, wherein: The second terminal receives a first reference signal and a second reference signal of a side link SL sent by the first terminal in a same first time unit, including: If the second reference signal exists, the second terminal receives the first reference signal and the second reference signal in a first receiving mode according to the time domain density of the second reference signal, where the first receiving mode includes at least one of the following: The second terminal does not expect the first reference signal and the second reference signal to be mapped in the same second time unit; When the first reference signal and the second reference signal are mapped to the same second time unit, the second terminal does not expect to receive the second reference signal, and the second terminal expects to receive the first reference signal; or, the second terminal does not expect to receive the first reference signal, and the second terminal expects to receive the second reference signal.

24. The signal receiving method according to claim 20, wherein: The first reference signal and the second reference signal are located in different resource elements RE, including at least one of the following: The second terminal does not expect the first reference signal and the second reference signal to be mapped to the same RE; In a case where the first reference signal and the second reference signal are mapped to the same RE, the second terminal does not expect to receive the second reference signal, and the second terminal expects to receive the first reference signal; Or, the second terminal does not expect to receive the first reference signal, and the second terminal expects to receive the second reference signal.

25. The signal receiving method according to claim 20, wherein: The second terminal receives a first reference signal and a second reference signal of a side link SL sent by the first terminal in a same first time unit, including: If the second reference signal exists, the second terminal receives the first reference signal and the second reference signal in a second receiving mode according to the frequency domain density of the first reference signal or the second reference signal, where the second receiving mode includes at least one of the following: The second terminal does not expect the first reference signal and the second reference signal to be mapped to the same RE; When the first reference signal and the second reference signal are mapped to the same RE, the second terminal does not expect to receive the second reference signal, and the second terminal expects to receive the first reference signal; or, the second terminal does not expect to receive the first reference signal, and the second terminal expects to receive the second reference signal.

26. The signal receiving method according to claim 20, wherein: The second terminal receives a first reference signal and a second reference signal of a side link SL sent by the first terminal in a same first time unit, including: If the second reference signal exists, the second terminal receives the first reference signal and the second reference signal in a third receiving mode according to the frequency domain density of the first reference signal or the second reference signal, where the third receiving mode includes at least one of the following: The second terminal expects to receive a first reference signal and a second reference signal located in different second time units; The second terminal expects to receive a first reference signal and a second reference signal located in different resource elements RE.

27. A signal sending device, wherein: include: A sending module is used to send the first reference signal and the second reference signal of the side link SL in the same first time unit. deliver; The first time unit belongs to a shared resource pool; The first reference signal and the second reference signal are located in different second time units, or the first reference signal and the second reference signal are located in different resource elements RE; and the size of the second time unit is smaller than the size of the first time unit.

28. A signal receiving device, wherein: include: A receiving module, configured to receive a first reference signal and a second reference signal of a side link SL sent by a first terminal in a same first time unit; The first time unit belongs to a shared resource pool; The first reference signal and the second reference signal are located in different second time units, or the first reference signal and the second reference signal are located in different resource elements RE; and the size of the second time unit is smaller than the size of the first time unit.

29. A first terminal, wherein: It includes a processor and a memory, the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the signal sending method according to any one of claims 1 to 19 are implemented.

30. A second terminal, wherein: It includes a processor and a memory, the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the signal receiving method as described in any one of claims 20 to 26 are implemented.

31. A readable storage medium, wherein: The readable storage medium stores a program or instruction, and when the program or instruction is executed by the processor, it implements the signal sending method as described in any one of claims 1 to 19, or implements the steps of the signal receiving method as described in any one of claims 20 to 26.

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