Transmission method, apparatus and related device of reference signal

Abstract

The application discloses a transmission method, device and related equipment of a reference signal, and belongs to the technical field of communication. The method comprises the following steps: a terminal determines a target transmission resource for transmitting a sidelink (SL) reference signal, wherein the SL reference signal comprises a reference signal for positioning; and the terminal transmits the SL reference signal through the target transmission resource.

Description

Technical Field

[0001] This application belongs to the field of communication technology, and specifically relates to a method, apparatus and related equipment for transmitting a reference signal. Background Technology

[0002] Long Term Evolution (LTE) systems support sidelink transmission, meaning data transmission between terminals occurs directly at the physical layer. LTE sidelink communication is broadcast-based, which, while suitable for basic safety-related communications in vehicle-to-everything (V2X) networks, is not applicable to more advanced V2X services. 5G New Radio (NR) systems will support more advanced sidelink transmission designs, such as unicast, multicast, or multicast, thus enabling support for a wider range of service types.

[0003] Currently, positioning on SL requires consideration of the resource allocation of reference signals used for positioning in order to meet the positioning accuracy requirements when using SL reference signals. Summary of the Invention

[0004] This application provides a method, apparatus, and related equipment for transmitting a reference signal, which can solve the positioning accuracy problem when using the SL reference signal for positioning.

[0005] Firstly, a method for transmitting a reference signal is provided, comprising:

[0006] The terminal determines the target transmission resource for transmitting the sublink SL reference signal, the SL reference signal including a reference signal for positioning;

[0007] The terminal transmits the SL reference signal through the target transmission resource.

[0008] Secondly, a reference signal transmission device is provided, comprising:

[0009] A determination module is used to determine the target transmission resources for transmitting the sublink SL reference signal, the SL reference signal including a reference signal for positioning;

[0010] A transmission module is used to transmit SL reference signals through the target transmission resource.

[0011] Thirdly, a terminal is provided, including a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the reference signal transmission method as described in the first aspect.

[0012] Fourthly, a readable storage medium is provided, on which a program or instructions are stored, which, when executed by a processor, implement the steps of the reference signal transmission method as described in the first aspect.

[0013] Fifthly, a chip is provided, the chip including a processor and a communication interface, the communication interface being coupled to the processor, the processor being used to run network-side device programs or instructions to implement the reference signal transmission method as described in the first aspect.

[0014] In this embodiment, the terminal determines a target transmission resource for transmitting the secondary link (SL) reference signal; the terminal transmits the SL reference signal through the target transmission resource to meet the requirement of positioning using the SL reference signal. Attached Figure Description

[0015] Figure 1 This is a structural diagram of a network system provided in an embodiment of this application;

[0016] Figure 2 This is a flowchart of a reference signal transmission method provided in an embodiment of this application;

[0017] Figure 3 This is a timing diagram of the terminal transmitting a reference signal provided in an embodiment of this application;

[0018] Figure 4 This is a structural diagram of the reference signal transmission device provided in the embodiments of this application;

[0019] Figure 5 This is a structural diagram of the communication device provided in the embodiments of this application;

[0020] Figure 6 This is a structural diagram of the terminal provided in the embodiments of this application. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0022] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same class, not limited in number; for example, a first object can be one or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship. In this application, "transmission" refers to the transmission of a signal, not signal sending in the narrow sense.

[0023] It is worth noting that the technologies described in this application are not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, 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), and other systems. The terms "system" and "network" in this application are often used interchangeably, and the described technologies can be used with the systems and radio technologies mentioned above, as well as with other systems and radio technologies. However, the following description describes New Radio (NR) systems for illustrative purposes, and the term NR is used in most of the following description, although these technologies can also be applied to applications other than NR systems, such as 6th generation (6G) radio systems. th Generation 6G communication system.

[0024] Figure 1This diagram illustrates a structural diagram of a wireless communication system applicable to embodiments of this application. The wireless communication system includes a terminal 11 and a network-side device 12. The terminal 11 can also be referred to as a terminal or user equipment (UE). The terminal 11 can be a mobile phone, tablet computer, laptop computer, personal digital assistant (PDA), handheld computer, netbook, ultra-mobile personal computer (UMPC), mobile internet device (MID), wearable device, vehicle-mounted device (VUE), pedestrian terminal (PUE), etc. Wearable devices include wristbands, headphones, glasses, etc. It should be noted that this application does not limit the specific type of terminal 11. Network-side device 12 can be a base station or a core network. The base station can be referred to as a node B, evolved node B, access point, base transceiver station (BTS), radio base station, radio transceiver, basic service set (BSS), extended service set (ESS), B node, evolved B node (eNB), home B node, home evolved B node, WLAN access point, WiFi node, transmitting and receiving point (TRP), or any other suitable term in the field, as long as the same technical effect is achieved. The base station is not limited to specific technical terms. It should be noted that in this application embodiment, only the base station in the NR system is used as an example, but the specific type of base station is not limited.

[0025] The method for transmitting reference signals provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0026] Please see Figure 2 , Figure 2 This is a flowchart illustrating a method for transmitting a reference signal according to an embodiment of this application. The method includes:

[0027] Step 201: The terminal determines the target transmission resource for transmitting the SideLink (SL) reference signal, which includes a reference signal for positioning.

[0028] The SL reference signal may include: SL positioning reference signals (PRS) and other SL reference signals. Other SL reference signals are extended for positioning, such as the SL synchronization signal block (S-SSB), SL channel state information reference signals (CSI-RS), SL phase-tracking reference signal (PTRS), or SL demodulation reference signal (DMRS). In this application, the SL reference signal refers to the reference signal used for positioning, not just the SL PRS. The SL PRS mentioned in the following description is for illustrative purposes only and is not limited to the SL PRS. Schemes applicable to the SL PRS are applicable to other SL reference signals used for positioning.

[0029] The target transport resources may include candidate resources or reserved resources.

[0030] Step 202: The terminal transmits the SL reference signal through the target transmission resource. Transmitting the SL reference signal may include sending or receiving the SL reference signal.

[0031] In this embodiment, the terminal determines the target transmission resource for transmitting the secondary link reference signal, and transmits the SL reference signal through the target transmission resource to meet the requirement of positioning using the SL reference signal.

[0032] In the above, the target transmission resource includes at least one of the following:

[0033] Resources predefined by the protocol;

[0034] Resources configured on network-side devices;

[0035] Resources configured in the terminal or other terminals;

[0036] Resources indicated by network-side devices;

[0037] The resources indicated by the terminal or other terminals;

[0038] Resources determined based on the first mapping relationship between the first resource and the reserved resources;

[0039] Resources determined based on the second mapping relationship between the first resource and the candidate resources;

[0040] Resources determined according to predefined rules in the protocol;

[0041] Resources determined according to the rules configured on the network-side devices;

[0042] Resources determined according to rules configured on the terminal or other terminals;

[0043] Resources determined according to the rules indicated by the network-side devices;

[0044] The first resource includes at least one of the following:

[0045] The first resource includes the resources of the Physical Sidelink Share Channel (PSSCH);

[0046] Resources of the Physical Sidelink Control Channel (PSCCH);

[0047] PSCCH candidate resources;

[0048] PSSCH candidate resources;

[0049] Resources of the Physical Sidelink Feedback Channel (PSFCH);

[0050] PSFCH candidate resources;

[0051] Resources of the Physical Sublink Broadcast Channel (PSBCH);

[0052] DMRS resources;

[0053] CSI-RS resources;

[0054] PTRS resources.

[0055] It should be noted that "terminal configuration" in this application can be understood as "terminal or other terminal configuration". For descriptions that only mention "terminal configuration" (e.g., the resources of the terminal configuration), it can be understood as "terminal or other terminal configuration". That is to say, the terminal configuration or terminal indication in the embodiments of this application is not limited to terminal configuration or indication, but can also be other terminal configuration or indication.

[0056] The SL reference signal can be configured or indicated as a periodic, semi-static, or aperiodic transmission. Accordingly, the target transmission resource for transmitting the SL reference signal can be a periodic resource, a semi-static resource, or an aperiodic resource.

[0057] In the above, if the SL reference signal is configured or indicated as periodic transmission, the period value of periodic transmission is configured or indicated; if the SL reference signal is configured or indicated as semi-static transmission, the Downlink Control Information (DCI) or Sidelink Control Information (SCI) dynamically triggers the configuration of resource enabling or disabling; if the SL reference signal is configured or indicated as aperiodic transmission, the position of the SL reference signal is pre-configured or configured.

[0058] The SL reference signal resources configured by the terminal or other terminal (e.g., via PC5-RRC configuration) can cover the SL reference signal resources configured by the network-side equipment (e.g., via Radio Resource Control (RRC) signaling configuration).

[0059] If the target transmission resource is a candidate resource for the SL reference signal, the terminal can further select the transmission resource for the SL reference signal from the candidate resources.

[0060] In one embodiment of this application, the target transmission resources configured by the terminal or other terminal cover the target transmission resources configured by the network-side device;

[0061] And / or, the network-side device may overwrite the target transmission resources configured via RRC by means of the target transmission resources indicated by the SCI sent by the Medium Access Control (MAC) control element (CE), DCI, or terminal.

[0062] Specifically, the resources for transmitting SL reference signals can be dynamically indicated via MAC CE, DCI, and SCI, i.e., the target transmission resources can be indicated. The target transmission resources indicated by the network-side device via MAC CE, DCI, or SCI sent by the terminal cover the target transmission resources configured via RRC.

[0063] In one embodiment of this application, the network-side device configures at least one style of the target transmission resource for the terminal. The target style of the target transmission resource is one of the at least one styles, which is indicated by a MAC CE indication, a DCI indication or an SCI indication sent by the terminal and sent by the network-side device.

[0064] For example, network-side equipment pre-configures or configures one or more patterns (e.g., N patterns) of SL PRS resources that the terminal can use, and indicates the SL PRS resource pattern adopted by the UE through MAC CE, DCI, or SCI. (RRC configures the available PRS patterns, dynamically indicating the specific pattern);

[0065] If the number of pre-configured or configured SL PRS resource patterns N = 1, then the size of the field value in DCI or SCI is 0;

[0066] If the number of pre-configured or configured SL PRS resource patterns N>1, then the size of the domain values ​​in DCI or SCI is log2(N) bits.

[0067] In one embodiment of this application, when there is a first mapping relationship between the first resource and the reserved resource, or a second mapping relationship between the first resource and the candidate resource, the target transmission resource is determined according to a predefined and / or detected method.

[0068] The first and second mapping relationships can be determined through predefinition, preconfiguration, and configuration.

[0069] For example: predefine the mapping relationship between SL PRS resources and PSFCH reserved resources. SL PRS is located on the symbol where PSFCH is located, and the mapping starts from the next PRB after the highest PRB of PSFCH, or from the next sub-channel after the sub-channel where the highest PRB of PSFCH is located.

[0070] For example: the mapping relationship between the pre-configured SL PRS resources and the reserved resources of PSSCH / PSCCH. The SL PRS is located at least N1 symbols after the PSSCH / PSCCH, and the frequency domain resources of the SL PRS are the same size as the frequency domain resources of the PSSCH / PSCCH.

[0071] In one embodiment of this application, when the first resource includes resources of PSSCH and / or resources of PSCCH, or when the first resource includes candidate resources of PSCCH and / or candidate resources of PSSCH, the target transmission resource is determined based on at least one of detection, the first mapping relationship, and the second mapping relationship.

[0072] For example, the UE determines the resource location of SL PRS based on the resource location of PSSCH / PSCCH determined by detection, and the mapping relationship between SL PRS resources and PSSCH / PSCCH reserved resources;

[0073] Alternatively, the UE determines the resource location of the SL PRS based on the detection information, the resource location of the PSFCH, and the mapping relationship between the resources of the SL PRS and the reserved resources of the PSFCH.

[0074] In one embodiment of this application, the target transmission resource satisfies at least one of the following:

[0075] The lowest sub-channel of the target transmission resource is the starting position of the SL reference signal;

[0076] The lowest physical resource block (PRB) corresponding to the lowest sub-channel of the target transmission resource is the starting position of the SL reference signal.

[0077] The highest sub-channel of the target transmission resource is the end position of the SL reference signal;

[0078] The highest PRB corresponding to the highest sub-channel of the target transmission resource is the end position of the SL reference signal.

[0079] For example, when there is a mapping relationship between the time domain and / or frequency domain of the candidate resource and the PSFCH, the lowest subchannel of the candidate resource's PSFCH can be selected as the starting position of the SL reference signal, or the lowest PRB corresponding to the lowest subchannel of the candidate resource can be selected as the starting position of the SL reference signal, or the highest subchannel of the candidate resource can be selected as the ending position of the SL reference signal, or the highest PRB corresponding to the highest subchannel of the candidate resource can be selected as the ending position of the SL reference signal.

[0080] In one embodiment of this application, when the SL reference signal is configured, the PSFCH is enabled. Further, the time-domain location of the enabled PSFCH is the time-domain location of a candidate resource of the target transmission resource.

[0081] For example, if an SL reference signal is configured, the PSFCH configuration is enabled within the resource pool (this may directly depend on the network configuration). When a PRS is configured, the time-domain location of the PSFCH configuration within the resource pool is the candidate resource time-domain location of the PRS. Optionally, PSFCH configuration is enabled, but PSFCH transmission is disabled. It should be noted that in this case, the time-domain resource location of the PSFCH is used for SL reference signal transmission, not for PSFCH transmission. The unit of time-domain resources in this application can be a symbol, time slot, subframe, frame, ms, s, etc. The time-domain unit can be different in different situations, and this application does not impose any restrictions.

[0082] The PSFCH is configured within the resource pool, but the bandwidth of the SL reference signal is not limited to the resource pool. This emphasizes that it is located within the time-domain resource unit of the PSFCH.

[0083] In one embodiment of this application, the target transmission resource is determined according to at least one of the following:

[0084] The period value of the SL reference signal resource;

[0085] The time interval of the SL reference signal resource;

[0086] The number of times the SL reference signal is transmitted;

[0087] The index value of the SL reference signal;

[0088] The detection or measurement window of the SL reference signal;

[0089] The frequency domain resource bandwidth of the SL reference signal;

[0090] Resource pool identifier;

[0091] Repeat factor;

[0092] Identification parameters;

[0093] The priority of the SL reference signal;

[0094] Cyclic offset;

[0095] Transmission power.

[0096] Specifically, one or more period values ​​can be predefined, preconfigured, configured, or indicated. If the period value is obtained from the SCI, it can be the period in the Sidelink Control Information (SCI) format 1-A or the period value of the read data is the period of the PRS, or the period value of the PRS can be independently indicated by the SCI. There are no restrictions here.

[0097] Optionally, if the period value is 0, the UE transmits the SL reference signal according to the time-domain and / or frequency-domain indication (TRI), or in other words, the UE transmits the SL reference signal aperiodically. That is, when the period value of the SL reference signal resource is 0, the SL reference signal resource is determined according to the time-domain and / or frequency-domain indication, or the transmission of the SL reference signal resource is aperiodic.

[0098] In the above, the period value of the SL reference signal resource is determined according to at least one of the following:

[0099] Priority of the SL reference signal;

[0100] Quality of Service (QoS);

[0101] Delay;

[0102] Channel Busy Ratio (CBR);

[0103] Channel occupancy ratio (CR);

[0104] Reference Signal Receiving Power (RSRP);

[0105] Reference Signal Strength Indicator (RSSI).

[0106] The period value of the SL reference signal resource is related to the priority, QoS, delay, CBR, CR, RSRP, etc. of the SL reference signal.

[0107] For example, if CBR is greater than the CBR threshold, it is the first cycle; if CBR is less than the CBR threshold, it is the second cycle. (The more congested the resource pool, the less resources can be allocated to the SL reference signal, thus increasing the SL reference signal cycle.)

[0108] If the delay is greater than or equal to the delay threshold, it is the first cycle; if the delay is less than the delay threshold, it is the second cycle. (The shorter the delay, the sooner the transmission needs to be sent, and the shorter the transmission cycle.)

[0109] If the priority is less than or equal to the priority threshold, it is the first cycle; if the priority is greater than the priority threshold, it is the second cycle.

[0110] It should be noted that the period value defined above can refer to the period value of a single PRS resource or the period value of a PRS resource set.

[0111] In the above, the time interval of the SL reference signal resource satisfies at least one of the following:

[0112] The time interval is the interval between the last reserved SL reference signal resources;

[0113] The time interval is the interval between the reserved SL reference signal resources and the resources for the first transmission of the SL reference signal.

[0114] For example, the time interval is the interval since the last reserved SL reference signal resource (that is, the time interval since the last SL reference signal transmission): For example, UE 1 transmits PRS 1 and PRS 2. Among them, PRS 1 is transmitted twice; PRS 2 is transmitted twice. The timing sequence of UE 1's transmission is: first PRS 1, first PRS 2, second PRS 1, second PRS 2.

[0115] Among them, the previously reserved SL PRS resource is the resource that transmitted the same SL PRS (that is, the repetition interval, which is the same PRS in terms of UE). For example, the first PRS 1 and the second PRS 1 are the same SL PRS, or the first PRS 2 and the second PRS 2 are the same SL PRS; or, the previously reserved SL PRS resource is the resource of the UE's previous transmission of SL PRS (distinguished by UE, which can be the same PRS or different PRS, without limitation). For example, the interval between the resource that sent the first PRS 1 and the resource that sent the first PRS 2, without restriction on whether the PRS sent by these two resources are the same.

[0116] The time interval is the interval between the reserved SL PRS resources and the resources used for the first SL PRS transmission, which is the time unit for the initial SL PRS to send the SCI. The reserved SL PRS and the first transmitted SL PRS can be the same SL PRS (i.e., repetition) or different SL PRS; there is no restriction here. For example, the interval between the first PRS 1 and the first PRS 2, the interval between the first PRS 1 and the second PRS 1, and the interval between the first PRS 1 and the second PRS 2.

[0117] The target transmission resource can be determined based on the number of transmissions or index value of the SL reference signal. For example, the UE excludes corresponding resources based on the SL reference signal index value. For instance, if the SL PRS resource reservation indication is three resources reserved for SL PRS, and the SL PRS index indicates a second reservation, then within that period, the UE excludes the time domain resources where the SL PRS is located, as well as the SL PRS resources corresponding to the next interval of the SL PRS, based on the domain value. When excluding periodic resources, the UE excludes the resources of the period corresponding to the SL PRS, the periodic resources corresponding to the SL PRS resources in the next interval of the SL PRS, and the periodic resources of the SL PRS corresponding to the previous interval of the SL PRS resources, based on the domain value.

[0118] In the above, the size of the indication field used by RRC / MAC CE / DCI / SCI is log2(N) bits, where N is a predefined, preconfigured, or configured value.

[0119] In the above, the parameters of the detection or measurement window of the SL reference signal include at least one of the following:

[0120] length;

[0121] size;

[0122] Starting position;

[0123] End position;

[0124] The window's lifespan;

[0125] Window spacing;

[0126] Window priority (if the UE has limited capabilities, the priority can be used to determine which window's SL PRS to detect);

[0127] Data priority indicators (representing priority rules within the window), for example, indicating priority for SL data, or priority for SL PRS, or priority for SL PRS over SL signals or SL channels within the time slot, or priority for SL PRS over SL signals or SL channels on SL PRS symbols.

[0128] The detection or measurement window of the SL reference signal restricts the location of SL PRS detection or measurement. In the above configuration, detection or measurement is only performed when the signal falls within the window.

[0129] In the above, the frequency domain resource bandwidth of the SL reference signal satisfies at least one of the following:

[0130] The frequency domain resource bandwidth is the same as the BWP size of the SL bandwidth portion;

[0131] The bandwidth of the frequency domain resources is the same as the size of the frequency domain resources in the SL resource pool;

[0132] The frequency domain resource bandwidth is within the bandwidth of SL data or SL PSSCH;

[0133] The bandwidth of the frequency domain resources is the same as the bandwidth of the SL data or SL PSSCH;

[0134] The frequency domain resource bandwidth is indicated in terms of PRB or sub-channel granularity.

[0135] The target transmission resource can be determined based on the resource pool identifier. If it is restricted to the resource pool, it can be similar to the transmission of TX (transmit) UE data, which is restricted to the resource pool. This is equivalent to TXresource pool. If the UE receives this information, the UE determines the corresponding time-domain or frequency-domain resource range based on the resource pool configuration in SL and the resource pool ID.

[0136] The target transmission resources can be determined based on a repetition factor. The repetition factor can be the number of times the SL PRS is repeated, or the number of reserved resources.

[0137] The target transmission resource can be determined based on an identification parameter (ID parameter). The ID parameter includes at least one of the following: (it can be selected based on ID modulo, or it can be selected based on ID after combining sensing).

[0138] Determined based on the UE ID;

[0139] Determined based on the source ID;

[0140] Determined based on the destination ID;

[0141] Determined by group ID;

[0142] Determined based on member ID;

[0143] Determined by zone ID.

[0144] There are two types of group identifiers: group ID, which represents the group number, and member ID, which represents the member ID within the group and is used to identify different UEs within the group ID.

[0145] In the above, the priority of the SL reference signal satisfies at least one of the following:

[0146] The priority is a value that is predefined, preconfigured, configured, or indicated by the protocol.

[0147] The priority is related to the priority of upper-layer services or location services (for example, the priority is the same as the priority of upper-layer services or location services);

[0148] The priority is determined based on the priority of the data packet to be transmitted, the priority of the SL process, the priority of the Hybrid Automatic Repeat reQuest (HARQ) process, or the priority of the MAC Protocol Data Unit (PDU) (applicable to cases where the SL reference signal is transmitted together with the data packet).

[0149] The priority is determined based on a priority offset value, which is a value predefined, preconfigured, configured, or indicated by the protocol. For example, the priority of the data packet to be transmitted is added to or subtracted from the offset value.

[0150] In one embodiment of this application, the target transmission resource is determined based on the detection result. If the resource determined by the detection result satisfies a first condition, the resource determined by the detection result is excluded. The first condition includes at least one of the following:

[0151] SL reference signal resources indicated or reserved in SCI;

[0152] Resources whose RSRP is greater than or equal to the RSRP threshold value;

[0153] Reference signal resources whose overlap with occupied reference signal resources within a time domain unit meets preset conditions. The degree of overlap may include at least one of overlap size and overlap ratio.

[0154] Specifically, the UE performs detection within a preset resource or resource pool, and excludes the resource if at least one of the following conditions is met:

[0155] (1) SL reference signal resources indicated or reserved in SCI;

[0156] Optionally, if the UE detects an SL PRS resource, then the resource is excluded.

[0157] Among them, SL PRS can be determined based on SCI.

[0158] (2) The RSRP measured by the UE is greater than or equal to an RSRP threshold value, which is determined according to at least one of the following:

[0159] (21) The RSRP threshold value is a value that is predefined, preconfigured, configured, or indicated by the protocol;

[0160] For example: the predefined SL PRS priority value is 1.

[0161] (22) The RSRP threshold value is a value determined according to the priority mapping rule;

[0162] a) The RSRP threshold value is determined according to the mapping rules based on the SL PRS priority to be transmitted and the SL PRS priority to be received by the UE.

[0163] b) Based on the SL priority of the data packet to be sent by the UE and the priority of the received SL data packet, determine the RSRP threshold value according to the mapping rules (this case assumes that SL PRS and data packets are sent simultaneously, and the priority is not configured separately, but rather the priority of the data packet is taken).

[0164] c) Add the SL PRS priority offset to the SL priority of the data packet to be sent by the UE.

[0165] The priority offset value can be an integer.

[0166] The SL PRS priority is represented by subtracting the positive offset value from the SL priority value; therefore, the SL PRS priority is greater than the SL priority. Within the SL, a smaller priority value indicates a higher priority.

[0167] (23) The RSRP threshold value is determined based on the data priority and the RSRP offset value.

[0168] The first RSRP threshold value is determined based on the SL data, wherein the RSRP threshold value is the first RSRP threshold value plus the RSRP offset;

[0169] Wherein, the RSRP offset is a predefined, preconfigured, configured, or indicated parameter.

[0170] (24) The above RSRP offset or priority offset is related to the number of CR, CBR, ACK, NACK, etc.

[0171] (3) Exclude PRS resources that are already in use and select from the remaining available PRS resources. (The degree of overlap should be considered when deciding whether to exclude resources.)

[0172] (31) Exclude resources corresponding to the time domain unit;

[0173] When the overlapping resources within the corresponding time-domain unit exceed a preset value or preset ratio, all frequency-domain resources within the corresponding time-domain unit are excluded. The preset value and preset ratio are predefined, pre-configured, or configured parameters.

[0174] If the remaining resources within the corresponding time unit do not meet the QoS, required Resource Element (RE), or PRB of the SL PRS to be transmitted, then the entire resource within the corresponding time unit is excluded.

[0175] (32) Exclude overlapping resources (REs or PRBs, etc.) within the corresponding time-domain unit. Optionally, the remaining frequency-domain resources within the time-domain unit are optional.

[0176] For example, if UE1 has SL PRS1 to send, and detects that another UE (e.g., UE2) is sending SL PRS2, then UE1 checks how much resource (RE / RB / subchannel) is remaining in the time domain where PRS2 is located. If it is greater than a certain value, then UE1 excludes the entire time domain resource; otherwise, it only excludes the resource occupied by PRS2, and the remaining resource is used as reserved or candidate resource for PRS1.

[0177] In one embodiment of this application, the target transmission resource is determined based on the detection result. If the resource determined by the detection result satisfies a second condition, then the resource determined by the detection result is selected. The second condition includes at least one of the following:

[0178] Resources for which the SL reference signal RSRP measured by the UE is less than or equal to the RSRP threshold value;

[0179] Resources in time domain units not reserved by DCI or SCI;

[0180] This method can be used when the remaining resource units (RE, PRB, or sub-channels) within the time domain unit where the resources reserved by DCI or SCI are located are less than a preset value or a preset threshold. The preset value or preset ratio is a predefined, pre-configured, or configured value.

[0181] The UE performs detection within a preset resource or resource pool. If the second condition is met, the UE selects the resource as a candidate resource in the resource set.

[0182] In one embodiment of this application, the SL reference signal satisfies at least one of the following:

[0183] The interval between the SL reference signal and the SL reference signal received by the terminal is determined according to the DCI or SCI indication, or predefined by the protocol, or RRC configuration;

[0184] The interval between the SL reference signal and the SCI received by the terminal is determined according to the DCI or SCI indication, or predefined by the protocol, or RRC configuration.

[0185] In the above, the DCI or SCI indicates the interval between the SL PRS of UE 2 (which can be understood as the terminal) and the SL PRS of the (most recent) received UE 1 (which can be understood as the terminal communicating with the terminal). The minimum value of this resource interval is predefined, pre-configured, or configured (considering transmit / receive conversion and SCI demodulation). Optionally, the SCI can be a first-level SCI or a second-level SCI. For TX UE instructing RX (receiving) UE, the second-level SCI is more reliable for RX UE sending SL PRS resources. The first-level SCI is used to instruct TX UE to send SL PRS resources.

[0186] The DCI or SCI indicates the interval between UE 2's SL PRS and the reception of that SCI. The minimum value of the resource interval is predefined, pre-configured, or configured. Optionally, the SCI can be a first-level SCI, a second-level SCI, or a standalone SCI. It may be a header UE or an assisted UE indicating the available resources for the RX UE, and the location of the received SCI referenced when the RX UE sends the SL PRS.

[0187] The resources used by the terminal to transmit the SL reference signal have different bandwidths than the resources used by other terminals to receive the SL reference signal. For example, UE 1 transmits the SL PRS within the Bandwidth Part (BWP) range, while UE 2 receives the SL PRS within the resource pool range.

[0188] In one embodiment of this application, the target transmission resource is determined based on the detection or measurement window of the SL reference signal; then at least one of the following is satisfied:

[0189] The UE detects or measures the SL PRS within the detection or measurement window of the SL reference signal, that is, the PRS within the detection window is required to be detected.

[0190] The PRS resources configured or indicated by the network-side equipment, the terminal, or other terminals are located within the SL PRS processing window; or, in other words, the UE does not expect the configured or indicated detection or measurement PRS resources to be located outside the SL PRS processing window. That is, the reference signal is located within the detection or measurement window of the SL reference signal.

[0191] In one embodiment of this application, the cyclic offset is determined according to at least one of the following:

[0192] Random selection to determine;

[0193] The selection is determined based on the terminal identifier of the terminal;

[0194] Selection is determined based on the source identifier;

[0195] The selection is determined based on the target identifier;

[0196] Select and confirm based on the group identifier;

[0197] The selection is determined based on the Cyclic Redundancy Check (CRC) of the PSCCH.

[0198] The selection is determined based on the resource pool identifier.

[0199] In the above, there are two types of group identifiers: group ID, which represents the group number, and member ID, which represents the member ID number within the group, used to identify the different UEs within this group ID.

[0200] When determining the cyclic offset, the "selection determination" can be made by the sending terminal, the scheduling terminal, or the receiving terminal. If it is selected by another terminal, it can be notified to that terminal via other signaling.

[0201] In one embodiment of this application, the transmission power is determined according to at least one of the following:

[0202] Target path loss;

[0203] The power adjustment parameter is determined based on the predefined, preconfigured, or configured PRS power adjustment parameter alpha_SL_PRS. Optionally, a predefined or preconfigured default alpha_SL_PRS value (e.g., 1) can be used.

[0204] L1 RSRP measurement or L3 RSRP measurement.

[0205] The terminal can adjust the transmission power according to the target path loss, which includes at least one of the following:

[0206] The path loss between the terminal and the network-side device, for example, downlink (DL) path loss;

[0207] The path loss (e.g., DL pathloss) between the terminal and the receiving terminal, wherein the terminal is the sending terminal;

[0208] The maximum value of multiple path losses between the terminal and multiple other terminals, wherein there is a connection between the terminal and the multiple other terminals;

[0209] The minimum of multiple path losses between the terminal and the plurality of other terminals;

[0210] The average value of multiple path losses between the terminal and the plurality of other terminals;

[0211] The path loss of the terminal that is furthest from the other terminals among the plurality of other terminals;

[0212] The path loss of the terminal closest to the terminal among the plurality of other terminals;

[0213] DL path loss;

[0214] SL path loss;

[0215] The path loss is determined based on configured rules, such as whether to select the path loss based on distance or to determine it based on a comparison of path loss values.

[0216] In the above, the SCI refers to either a first-level SCI or a second-level SCI.

[0217] The following uses SL PRS as an example to illustrate the resource selection method for SL reference signals. It should be noted that " / " means "or" in the following.

[0218] 1. The UE transmits the SL reference signal according to resources predefined / preconfigured / configured / indicated by the protocol, or according to resources determined by predefined / preconfigured / configured / indicated rules. The resources for transmitting the SL reference signal satisfy at least one of the following:

[0219] a) Transmit SL reference signals (predefined / RRC / PC5-RRC) according to the resource predefined / network preconfiguration / network configuration / terminal configuration.

[0220] i. Configure / indicate that the reference signal is for periodic / semi-static / aperiodic transmission

[0221] 1. If it is a periodic transmission, then configure / indicate the period value;

[0222] 2. If it is a semi-static transmission, DCI / SCI will dynamically trigger the configuration of resource enable / de-enable.

[0223] 3. If it is a non-periodic transmission, then pre-configure / configure the position of the SL PRS.

[0224] ii. Optionally, the SL PRS configured on the terminal side (e.g., PC5-RRC) may override the SL PRS configured on the network side (e.g., RRC).

[0225] b) MAC CE / DCI / SCI dynamically indicates the resource information of SL PRS (dynamic indication).

[0226] i. Optional, dynamically indicated SL PRS can override the SL PRS resource information configured by the RRC.

[0227] c) Pre-configure / configure one or more patterns (e.g., Npatterns) of SL PRS resources that the UE can use. MACCE / DCI / SCI indicates the SL PRS resource pattern adopted by the UE. (RRC configures the available PRS patterns, dynamically indicating the specific pattern.)

[0228] i. If the number of pre-configured / configured SL PRS resource styles N = 1, then the size of the field value in DCI / SCI is 0;

[0229] ii. If the number of pre-configured / configured SL PRS resource patterns N>1, then the size of the domain values ​​in DCI / SCI is log2(N) bits.

[0230] d) Define the mapping relationship between predefined / preconfigured / configured reserved resources / candidate resources and PRS resources, and determine the resources of PRS based on the mapping relationship between the reserved resources / candidate resources and the PRS resources. At least one of the following must be satisfied:

[0231] i. The PRS resource is located in the time domain unit where the PSFCH is located.

[0232] 1. Optionally, a predefined mapping relationship between the time-frequency domain (at least one of the time domain and frequency domain) of reserved resources / candidate resources and the PSFCH is provided.

[0233] a) The lowest subchannel of the PSFCH's reserved / candidate resources is the starting position of the PRS.

[0234] b) The lowest PRB corresponding to the lowest subchannel of the PSFCH reserved / candidate resources is the starting position of the PRS.

[0235] c) The highest subchannel of the PSFCH reserved / candidate resources is the end position of the PRS.

[0236] d) The highest PRB corresponding to the highest subchannel of the PSFCH reserved / candidate resources is the end position of the PRS.

[0237] 2. Optionally, if PRS is configured, then PSFCH configuration is enabled within this resource pool. (This may also directly depend on network configuration.)

[0238] 3. Optionally, when PRS is configured, the time domain position of the PSFCH enabled configuration within the resource pool is the time domain position of the candidate resources of PRS.

[0239] a) Optional, PSFCH configuration is enabled, but PSFCH transmission is disabled.

[0240] b) In this case, the time-domain resource location of the PSFCH is used for the transmission of PRS, not for the transmission of PSFCH.

[0241] 4. Here, PSFCH is the configuration within the resource pool, but the bandwidth of PRS is not limited to the resource pool. This emphasizes that it is located within the time-domain resource unit of PSFCH.

[0242] ii. The PRS resources are detection resources determined according to the resources of PSSCH / PSCCH.

[0243] 1. Define / configure the mapping relationship between PSSCH / PSCCH resources and PRS resources. Based on the resources of the selected / candidate PSSCH / PSCCH determined by detection and the mapping relationship, determine the selected / candidate resources of PRS.

[0244] 2. This applies when a PRS resource pool is defined independently, but sensing is not performed within the PRS resource pool. Instead, a mapping relationship is defined between the PRS resource pool and another resource pool used for transmitting PSSCH / PSCCH.

[0245] e) The above SCI signaling can be a 1st SCI / 2nd SCI indication.

[0246] f) The above configuration can be parameters configured for each carrier / BWP / resource pool.

[0247] 2. The resources for transmitting the SL reference signal are obtained based on at least one of the following parameters:

[0248] a) The period value of SL PRS satisfies at least one of the following:

[0249] i. Predefine / preconfigure / configure / indicate one or more period values. (Note: If the period value is obtained from the SCI, it can be the period in SCI format 1-A / the period value of the read data is the period of the PRS, or the period value of the PRS is independently indicated by the SCI. There are no restrictions here. This can be specified in the instruction manual.)

[0250] ii. Optionally, if the period value is 0, the UE transmits SL PRS according to the time-frequency domain indication (TRI), or in other words, the UE transmits SL PRS aperiodically.

[0251] iii. Optionally, the magnitude of the period value is related to SL PRS priority / QoS / latency / CBR / CR / RSRP, etc.

[0252] 1. If CBR is greater than the CBR threshold, it is the first cycle; if CBR is less than the CBR threshold, it is the second cycle. (The more congested the resource pool, the more resources allocated to PRS can be appropriately reduced, thus increasing the SL PRS cycle.)

[0253] 2. If the delay is greater than or equal to the delay threshold, it is the first cycle; if it is less than the threshold, it is the second cycle. (The shorter the delay, the faster the transmission needs to be, and the shorter the transmission cycle.)

[0254] 3. If the priority is less than or equal to the priority threshold, it is the first cycle; if it is greater than the threshold, it is the second cycle.

[0255] iv. The periodic value defined here can refer to the periodic value of a PRS resource or the periodic value of a PRS resource set.

[0256] b) The time interval of the SL PRS resource. The time interval satisfies at least one of the following:

[0257] i. The time interval is the interval since the last reserved SL PRS; (that is, the time interval since the last SL PRS transmission)

[0258] 1. The previously reserved SL PRS is the same as this SL PRS (that is, the repetition interval);

[0259] 2. Alternatively, the previous SL PRS for the UE (distinguished by UE, this can be the same PRS or different PRS).

[0260] ii. The time interval is the interval between the reserved SL PRS and the first SL PRS transmission; (that is, the time unit for the initial SL PRS to transmit SCI)

[0261] 1. Wherein, the reserved SL PRS can be the same SL PRS (i.e., repetition) or a different SL PRS as the first SL PRS sent, without any restrictions.

[0262] c) The SL PRS is the Nth transmission / SL PRS index.

[0263] i. The UE excludes the corresponding resources based on the SL PRS index. (Please consider periodic resource exclusion in PRS)

[0264] 1. For example: If the SL PRS resource reservation indication is that three resources are reserved for SL PRS, and the SL PRS index indication is that it is reserved for the second time; then, within this period, the UE excludes the time domain resources where the SL PRS is located, as well as the SL PRS resources corresponding to the next interval of the SL PRS, according to the aforementioned threshold value; when the UE excludes periodic resources, it excludes the resources of the period corresponding to the SL PRS, as well as the periodic resources corresponding to the SL PRS resources in the next interval of the SL PRS, and the periodic resources of the SL PRS corresponding to the previous interval of the SL PRS resources, according to the aforementioned threshold value.

[0265] 2. For example Figure 3 As shown, the UE transmits SL PRS in time slot K. In time slot K, it also transmits SCI carrying an SL PRS index indication, a first interval indication, a second interval indication, and a period indication. If in time slot K, the SL PRS index = 2, the first interval indication value is GAP 1, the second interval indication value is GAP 2, and the period indication value is T, then the SL PRS resources reserved by the terminal after time slot K are the resources for time slot K+GAP 2, time slot K+T-GAP 1, time slot K+T, and time slot K+T+GAP 2. If other terminals detect the UE's SCI in time slot K, they will exclude the resources for time slot K+GAP 2, time slot K+T-GAP 1, time slot K+T, and time slot K+T+GAP 2 based on the SL PRS index indication, the first interval indication, the second interval indication, and the period indication.

[0266] ii. In the above, the size of the indication field of the MAC CE / DCI / SCI indicator is log2(N) bits, where N is a predefined / preconfigured / configured value.

[0267] d) PRS detection / measurement window (e.g., SL PRS processing window), including at least one of the following parameters: (The detection / measurement window restricts the location of SL PRS detection / measurement; in the above configuration, detection / measurement only occurs when the data falls within the window.)

[0268] i. Length / Size

[0269] ii. Starting position

[0270] iii. End position

[0271] iv. Window cycle

[0272] v. Window spacing

[0273] vi. Window priority (If the UE has limited capabilities, priority can be used to determine which window's SLPRS to detect)

[0274] vii. Data priority indicator (indicating priority rules within the window)

[0275] 1. Indicate SL data priority, or indicate SL PRS priority.

[0276] 2. Alternatively, indicate whether SL PRS takes precedence over SL signal / SL channel in that time slot, or whether SLPRS takes precedence over SL signal / SL channel on the SL PRS symbol.

[0277] e) The bandwidth of the bandwidth frequency domain resources of the SL PRS

[0278] i. Using PRB as the granularity / using subchannel as the granularity indicator

[0279] ii. Optionally, the frequency domain resource bandwidth configuration can be specified to be the same as the SL BWP size.

[0280] iii. Optionally, it is indicated that the frequency domain resource size is the same as that of the SL resource pool;

[0281] iv. Optionally, the bandwidth of SL PRS is within the bandwidth of SL data / SL PSSCH, or the same as the bandwidth of SL data / PSSCH.

[0282] f) Resource pool ID (If restricted to the resource pool range, this can be similar to TX UE data transmission, limited to the resource pool range. Equivalent to TX resource pool)

[0283] i. If the UE receives this information, the UE determines the corresponding time / frequency domain resource range based on the resource pool configuration in the SL and the resource pool ID.

[0284] g) Repetition factor

[0285] i. The number of times the SL PRS is repeatedly transmitted, or the number of reserved resources.

[0286] h) The ID parameter includes at least one of the following: (It can be selected based on the modulo of ID, or it can be combined with sensing and then selected based on ID.)

[0287] i. Determined based on the UE ID;

[0288] ii. Determined based on source ID;

[0289] iii. Determined based on destination ID;

[0290] iv. Determined based on member ID;

[0291] v. Determined based on zone ID.

[0292] i) The priority of SL PRS, wherein the priority satisfies at least one of the following:

[0293] i. The priority of the SL PRS is a value predefined / preconfigured / configured / indicated by the protocol; or, it is related to the priority of the upper layer service / location service (e.g., the same).

[0294] ii. The priority of the SL PRS is determined according to the priority of the data packet / SL process / HARQ process / MACPDU to be transmitted (when the SL PRS is transmitted together with the data).

[0295] 1. Add / subtract the offset value to the priority of the data packet to be transmitted.

[0296] iii. The offset value is a parameter predefined by the protocol, or a parameter pre-configured / configured / indicated.

[0297] 3. If the UE selects SL PRS resources based on sensing, then at least one of the following conditions must be met: (In mode 2, the UE selects resources based on sensing.)

[0298] a) If the UE performs detection within a preset resource / resource pool and meets at least one of the following conditions, then the resource is excluded:

[0299] i. SL PRS resources indicated / reserved in the SCI; optionally, if the UE detects SL PRS resources, then exclude those resources. The SL PRS resources are determined based on the SCI.

[0300] ii. The SL PRS RSRP measured by the UE is greater than or equal to the RSRP threshold value;

[0301] 1. The RSRP threshold value is a value predefined / preconfigured / configured / indicated by the protocol;

[0302] For example: the predefined SL PRS priority value is 1.

[0303] 2. Alternatively, the RSRP threshold value is a value determined according to the priority mapping rule.

[0304] a) The RSRP threshold value is determined according to the mapping rules based on the SL PRS priority to be transmitted and the SL PRS priority to be received by the UE.

[0305] b) Based on the SL priority of the data packet to be sent by the UE and the priority of the received SL data packet, determine the RSRP threshold value according to the mapping rules (this case assumes that SL PRS and data packets are sent simultaneously, and the priority is not configured separately, but rather the priority of the data packet is taken).

[0306] c) Add the SL PRS priority offset to the SL priority of the data packet to be sent by the UE.

[0307] in,

[0308] The priority offset value can be an integer. For example, if the SL priority value is subtracted from the positive offset value to represent the SL PRS priority, then the SL PRS priority is greater than the SL priority. In SL, the smaller the priority value, the higher the priority.

[0309] 3. Alternatively, the RSRP threshold value may be determined based on the data priority and the RSRP offset.

[0310] For example, a first RSRP threshold value is determined based on SL data. The RSRP threshold value is the first RSRP threshold value plus an RSRP offset, where the RSRP offset is a predefined / preconfigured / configured / indicated parameter.

[0311] 4. Among them, the RSRP offset / priority offset mentioned above is related to the number of CR / CBR / ACK / NACK, etc.

[0312] iii. Exclude already occupied PRS resources and use the remaining available PRS resources. (The decision to exclude resources should be based on the degree of overlap.)

[0313] 1. Exclude resources with the corresponding time unit;

[0314] a) When the overlapping resources within the corresponding time-domain unit exceed a preset value / preset ratio, exclude all frequency-domain resources within the corresponding time-domain unit. The preset value / preset ratio is a predefined / preconfigured / configured parameter.

[0315] b) If the remaining resources in the corresponding time unit do not meet the QoS / required RE(s) / PRB(s) of the SL PRS with transmission, then the entire resource in the corresponding time unit is excluded.

[0316] 2. Exclude overlapping resources (RE(s) / PRB(s), etc.) within the corresponding time-domain unit. Optionally, the remaining frequency-domain resources within the time-domain unit are optional.

[0317] b) If the UE performs detection within a preset resource / resource pool and meets at least one of the following conditions, then the resource is selected as a resource in the candidate resource set:

[0318] i. The SL PRS RSRP measured by the UE is less than or equal to the RSRP threshold value; wherein the RSRP threshold value is defined in the same way as a) excluding the resources.

[0319] ii. Select resources with time units not reserved by DCI / SCI

[0320] iii. Select the remaining RE(s) / PRB(s) within the time frame where the DCI / SCI reserved resources are located. Optionally, this method can be used when the DCI / SCI reserved resources / resource ratio is less than a preset value / preset threshold. The preset value / preset ratio is a predefined / preconfigured / configured parameter.

[0321] c) Optionally, in a) excluding the resource and b) selecting the resource, the DCI / SCI indicates whether to use data priority or SL PRS priority for resource exclusion / resource selection.

[0322] d) Optionally, in a) excluding the resource and b) selecting the resource, the priority of the selected data is compared with the maximum / minimum value in the SL PRS priority to exclude / select the resource.

[0323] 4. Determining SL PRS resources for UE 2 (e.g., RX UE). (The method for determining resources independently for UE 2 is the same as above; the method for determining resources based on TX UE / header UE is as follows.)

[0324] a) The interval between the SL PRS of UE 2 and the (most recent) received SL PRS of UE 1, as indicated in the DCI / SCI.

[0325] i. Predefine / preconfigure / configure the minimum value of the resource interval (if considering send / receive conversion and SCI demodulation).

[0326] ii. Optionally, the above SCI is either the 1st SCI or the 2nd SCI. For example, in a), the TX UE instructs the RX UE to send SLPRS resources, so the 2nd SCI is more reliable. The 1st SCI is used to instruct the TX UE to send SLPRS resources.

[0327] b) The interval between the SL PRS of UE 2 and the received SCI is indicated in the DCI / SCI.

[0328] i. Predefine / preconfigure / configure the minimum value of the resource interval.

[0329] ii. Optionally, the above SCI is the 1st SCI / 2nd SCI / standalone SCI. b) may be the header UE / assisted UE indicating the resources that the RX UE can access, and the RX UE sends SL PRS reference to the location of the received SCI.

[0330] 5. If the SL PRS processing window is configured / indicated, then at least one of the following must be met:

[0331] a) The UE detects / measures the SL PRS within the SL PRS processing window. (That is, it is specified that the PRS within the detection window needs to be detected.)

[0332] b) The PRS resources configured / indicated by the network side / terminal side are within the SL PRS processing window; or, the UE does not expect the PRS resources configured / indicated for detection / measurement to be outside the SL PRS processing window.

[0333] 6. UE 1 can use different bandwidths to transmit SL PRS and UE 2 can use different bandwidths to receive SL PRS.

[0334] UE 1 transmits SL PRS within the BWP range, and UE 2 receives SL PRS within the resource pool range.

[0335] 7. The resource selection of the SL PRS also includes at least one of the following:

[0336] a) Cyclic shift of SL PRS

[0337] i. Optional, the UE randomly selects a cyclic shift;

[0338] ii. Optionally, the UE selects a cyclic shift based on at least one of the following: UE ID, source ID, destination ID, group ID, PSCCHCRC, and resource pool ID.

[0339] 8. The UE adjusts the transmit power according to the path loss, and the power control satisfies at least one of the following:

[0340] a) Pathloss is determined based on at least one of the following:

[0341] i. Path loss between the UE and the base station (e.g., DL path loss)

[0342] ii. Path loss between the UE and the receiving terminal (e.g., SL path loss)

[0343] iii. If the terminal is connected to multiple terminals, then at least one of the following conditions must be met:

[0344] 1. The maximum value of multiple pathlosses between the UE and multiple terminals;

[0345] 2. The minimum value of multiple pathlosses between the UE and multiple terminals;

[0346] 3. The average value of multiple path losses between the UE and multiple terminals;

[0347] 4. Path loss of the UE furthest from the stated UE;

[0348] 5. The path loss of the UE closest to the stated UE.

[0349] iv. Optionally, the base station / terminal pre-configures / configures the UE to perform power control based on either DL pathloss or SL pathloss;

[0350] v. Optional, base station / terminal pre-configuration / configuration method (e.g., selecting pathloss based on distance, or determining it based on comparison of pathloss values) for power control.

[0351] b) Determined based on the power adjustment parameter alpha_SL_PRS of the predefined / preconfigured / configured power PRS.

[0352] Optional, a predefined / preconfigured default alpha_SL_PRS value (e.g., a value of 1).

[0353] c) Power control is determined based on L1 RSRP measurements or L3 RSRP measurements.

[0354] 9. The time-domain resource units defined in the above method can be symbols, time slots, subframes, frames, milliseconds (ms), seconds (s), etc. The time-domain units can differ depending on the parameters. No restrictions are placed here.

[0355] The following example illustrates the method for transmitting the reference signal provided in this application.

[0356] 1. Reserve SL PRS resources during the network-side equipment configuration cycle.

[0357] One implementation method:

[0358] 1. Configure the network (i.e., network-side equipment) to transmit SL PRS resource pool / BWP / carrier resources.

[0359] 2. Network / Terminal Configuration: This configuration determines the period T and start position t for SL PRS. The network configuration uses two sets of parameters: t1, T1; and t2, T2. (This is to ensure that in a pair of TX-RX UEs, one set is used for the TX UE and the other for the RX UE, so that the measurement interval is not too far.)

[0360] 3. UE1 sends SL PRS 1 on the corresponding resource based on t1 and T1; UE2 detects SL PRS, and if it receives SL PRS 1, it sends SL PRS 2 on the SL PRS resource corresponding to the nearest t2 and T2.

[0361] Another implementation method:

[0362] 1. Configure network to transmit SL PRS resource pool resources.

[0363] 2. Network configuration / terminal configuration for the period T and start position t of SL PRS.

[0364] 3. UE1 sends SL PRS 1 on the corresponding resource based on t and T; UE2 detects SL PRS, and if it receives SL PRS 1, it sends SL PRS 2 on the nearest available periodic SL PRS resource.

[0365] 2. Configure the transmission resources of the TX UE on the network side, and the TX UE indicates the resources for the RX UE.

[0366] 1. Configure network to transmit SL PRS resource pool / BWP / carrier resources.

[0367] 2. Network configuration / terminal configuration for the period T and start position t of SL PRS.

[0368] 3. UE 1 sends SL PRS 1 on the corresponding resource according to t and T; UE 1 carries UE 2's SL PRS resource indication information in the 1st SCI (i.e., the first level SCI) or the 2nd SCI (i.e., the second level SCI).

[0369] 4. UE2 receives the SCI and detects the SL PRS. Based on the indication in the SCI, UE2 determines the SL PRS resource for UE2, and UE2 sends SL PRS 2 on the nearest available SL PRS resource.

[0370] III. UE selects SL PRS resources via sensing detection

[0371] 1. Configure network to transmit SL PRS resource pool / BWP / carrier resources.

[0372] 2. The UE performs SCI detection within the configured SL PRS resource pool / BWP / carrier. Based on the SCI indication, determine:

[0373] a) SL PRS resources indicated in SCI;

[0374] b) Determine the RSRP threshold value based on the priority carried in the SCI and the priority of the SL PRS to be transmitted, or determine the RSRP threshold value based on the priority carried in the SCI, the priority of the SL PRS to be transmitted, and the priority offset value.

[0375] 3. The UE measures the RSRP of the SL PRS and compares the measured RSRP with the RSRP threshold value.

[0376] a) If the measured SL PRS RSRP > RSRP threshold, UE 1 excludes the SL PRS resources indicated / reserved by SCI; or in other words, UE 1 does not consider the resources indicated / reserved by SCI as candidate resources.

[0377] b) If the measured SL PRS RSRP <= RSRP threshold, then UE 1 does not exclude the resources of the SL PRS indicated / reserved by SCI; or in other words, UE 1 will use the resources indicated / reserved by SCI as candidate resources.

[0378] 4. The UE selects one or more resources from the candidate resource set as resources of SL PRS.

[0379] 5. The UE sends SL PRS on the most recently available SL PRS resource.

[0380] IV. The TX UE selects SL PRS resources through sensing detection, and the TX UE indicates the resources available to the RX UE for transmitting SL PRS.

[0381] 1. Configure network to transmit SL PRS resource pool / BWP / carrier resources.

[0382] 2. UE 1 performs SCI detection within the configured SL PRS resource pool / BWP / carrier.

[0383] Determined according to SCI instructions:

[0384] a) SL PRS resources indicated in SCI;

[0385] b) Determine the RSRP threshold value based on the priority carried in the SCI and the priority of the SL PRS to be transmitted, or determine the RSRP threshold value based on the priority carried in the SCI, the priority of the SL PRS to be transmitted, and the priority offset value.

[0386] 3.UE 1 measures the RSRP of SL PRS and compares the measured RSRP with the RSRP threshold value.

[0387] a) If the measured SL PRS RSRP > RSRP threshold, UE 1 excludes the SL PRS resources indicated / reserved by SCI; or in other words, UE 1 does not consider the resources indicated / reserved by SCI as candidate resources.

[0388] b) If the measured SL PRS RSRP <= RSRP threshold, then UE 1 does not exclude the resources of the SL PRS indicated / reserved by SCI; or in other words, UE 1 will use the resources indicated / reserved by SCI as candidate resources.

[0389] 4. UE 1 selects one or more resources from the candidate resource set as resources of SL PRS.

[0390] 5. UE 1 transmits SL PRS on the most recently available SL PRS resource. UE 1 carries SL PRS resource indication information of UE 2 in the 1st SCI / 2nd SCI.

[0391] 6. UE2 receives the SCI and detects the SL PRS. Based on the indication in the SCI, UE2 determines the SL PRS resource for UE2, and UE2 sends SL PRS 2 on the nearest available SL PRS resource.

[0392] On SL reference signal resources, the UE can send or receive SL reference signals to locate the UE performing SL reference signal transmission.

[0393] It should be noted that the reference signal transmission method provided in this application embodiment can be executed by a reference signal transmission device or a control module in the reference signal transmission device for executing the reference signal transmission method.

[0394] The following embodiments use a reference signal transmission device to perform a reference signal transmission method as an example to illustrate the reference signal transmission device provided in this application.

[0395] Please see Figure 4 , Figure 4 This is a structural diagram of a reference signal transmission device provided in an embodiment of this application. The reference signal transmission device 300 includes:

[0396] The determining module 301 is used to determine the target transmission resources for transmitting the sublink SL reference signal, wherein the SL reference signal includes a reference signal for positioning;

[0397] The transmission module 302 is used to transmit the SL reference signal through the target transmission resource.

[0398] Optionally, the target transmission resource includes at least one of the following:

[0399] Resources predefined by the protocol;

[0400] Resources configured on network-side devices;

[0401] Resources configured in the terminal or other terminals;

[0402] Resources indicated by network-side devices;

[0403] The resources indicated by the terminal or other terminals;

[0404] Resources determined based on the first mapping relationship between the first resource and the reserved resources;

[0405] Resources determined based on the second mapping relationship between the first resource and the candidate resources;

[0406] Resources determined according to predefined rules in the protocol;

[0407] Resources determined according to the rules configured on the network-side devices;

[0408] Resources determined according to rules configured on the terminal or other terminals;

[0409] Resources determined according to the rules indicated by the network-side devices;

[0410] The first resource includes at least one of the following:

[0411] Physical secondary links share the resources of the PSSCH channel;

[0412] Resources of the Physical Sublink Control Channel (PSCCH);

[0413] PSCCH candidate resources;

[0414] PSSCH candidate resources;

[0415] Resources of the Physical Sublink Feedback Channel (PSFCH);

[0416] PSFCH candidate resources;

[0417] Resources of the Physical Sublink Broadcast Channel (PSBCH);

[0418] Resources for the demodulation reference signal DMRS;

[0419] Resources of Channel State Information Reference Signal (CSI-RS);

[0420] Resources for the Phase Tracking Reference Signal (PTRS).

[0421] Optionally, the target transmission resource can be a periodic resource, a semi-static resource, or an aperiodic resource.

[0422] Optionally, the target transmission resources configured by the terminal or other terminal cover the target transmission resources configured by the network-side device;

[0423] And / or,

[0424] The target transmission resources are covered by the target transmission resources configured by the Radio Resource Control (RRC) as indicated by the Media Access Control Unit (MAC CE), Downlink Control Information (DCI), or Sublink Control Information (SCI).

[0425] Optionally, the network-side device configures at least one style of the target transmission resource for the terminal. The target style of the target transmission resource is determined by a MAC CE indication, DCI indication, or SCI indication sent by the network-side device or the terminal. The target style is one of the at least one styles.

[0426] Optionally, if there is a first mapping relationship between the first resource and the reserved resource, or a second mapping relationship between the first resource and the candidate resource, the target transmission resource is determined according to a predefined and / or detected method.

[0427] Optionally, the target transmission resource satisfies at least one of the following:

[0428] The lowest sub-channel of the target transmission resource is the starting position of the SL reference signal;

[0429] The lowest physical resource block (PRB) corresponding to the lowest sub-channel of the target transmission resource is the starting position of the SL reference signal;

[0430] The highest sub-channel of the target transmission resource is the end position of the SL reference signal;

[0431] The highest PRB corresponding to the highest sub-channel of the target transmission resource is the end position of the SL reference signal.

[0432] Optionally, PSFCH is enabled when the SL reference signal is configured.

[0433] Optionally, the time-domain location of the enabled PSFCH is the time-domain location of the candidate resource of the target transmission resource.

[0434] Optionally, if the first resource includes resources of PSSCH and / or resources of PSCCH, or if the first resource includes candidate resources of PSCCH and / or candidate resources of PSSCH, the target transmission resource is determined based on at least one of detection, the first mapping relationship, and the second mapping relationship.

[0435] Optionally, the target transmission resource is determined according to at least one of the following:

[0436] The period value of the SL reference signal resource;

[0437] The time interval of the SL reference signal resource;

[0438] The number of times the SL reference signal is transmitted;

[0439] The index value of the SL reference signal;

[0440] The detection or measurement window of the SL reference signal;

[0441] The frequency domain resource bandwidth of the SL reference signal;

[0442] Resource pool identifier;

[0443] Repeat factor;

[0444] Identification parameters;

[0445] The priority of the SL reference signal;

[0446] Cyclic offset;

[0447] Transmission power.

[0448] Optionally, if the period value of the SL reference signal resource is 0, the SL reference signal resource is determined according to time domain and / or frequency domain indication, or the transmission of the SL reference signal resource is aperiodic transmission.

[0449] Optionally, the period value of the SL reference signal resource is determined according to at least one of the following:

[0450] Priority of the SL reference signal;

[0451] Quality of Service (QoS)

[0452] Delay;

[0453] Channel Busyness Rate (CBR);

[0454] Channel occupancy rate (CR);

[0455] Reference signal received power RSRP;

[0456] Reference Signal Strength Indicator (RSSI)

[0457] Optionally, the time interval of the SL reference signal resource satisfies at least one of the following:

[0458] The time interval is the interval between the last reserved SL reference signal resources;

[0459] The time interval is the interval between the reserved SL reference signal resources and the resources for the first transmission of the SL reference signal.

[0460] Optionally, the parameters of the detection or measurement window of the SL reference signal include at least one of the following:

[0461] length;

[0462] size;

[0463] Starting position;

[0464] End position;

[0465] The window's lifespan;

[0466] Window spacing;

[0467] Window priority;

[0468] Data priority indicator.

[0469] Optionally, the frequency domain resource bandwidth of the SL reference signal satisfies at least one of the following:

[0470] The frequency domain resource bandwidth is the same as the BWP size of the SL bandwidth portion;

[0471] The bandwidth of the frequency domain resources is the same as the size of the frequency domain resources in the SL resource pool;

[0472] The frequency domain resource bandwidth is within the bandwidth of SL data or SL PSSCH;

[0473] The bandwidth of the frequency domain resources is the same as the bandwidth of the SL data or SL PSSCH;

[0474] The frequency domain resource bandwidth is indicated in terms of PRB or sub-channel granularity.

[0475] Optionally, the priority of the SL reference signal satisfies at least one of the following:

[0476] The priority is a value predefined, configured, or indicated by the protocol;

[0477] The priority is related to the priority of upper-layer services or location services;

[0478] The priority is determined based on the priority of the data packet to be transmitted, the priority of the SL process, the priority of the Hybrid Automatic Repeat Request (HARQ) process, or the priority of the MAC Protocol Data Unit (PDU).

[0479] The priority is determined based on a priority offset value, which is a predefined, preconfigured, configured, or indicated value.

[0480] Optionally, the target transmission resource is determined based on the detection result. If the resource determined by the detection result meets a first condition, the resource determined by the detection result is excluded. The first condition includes at least one of the following:

[0481] SL reference signal resources indicated or reserved in SCI;

[0482] Resources whose RSRP is greater than or equal to the RSRP threshold value;

[0483] Reference signal resources whose overlap with occupied reference signal resources within a time domain unit meets preset conditions.

[0484] Optionally, the RSRP threshold value is determined according to at least one of the following:

[0485] The threshold value is a value predefined, configured, or indicated according to the protocol;

[0486] The threshold value is determined according to the priority mapping rule;

[0487] The threshold value is determined based on the data priority and the RSRP offset value.

[0488] Optionally, the target transmission resource is determined based on the detection result. If the resource determined by the detection result meets the second condition, then the resource determined by the detection result is selected. The second condition includes at least one of the following:

[0489] Resources whose RSRP is less than or equal to the RSRP threshold value;

[0490] Resources in time domain units not reserved by DCI or SCI;

[0491] The remaining resource units (RE, PRB, or sub-channels) within the time domain unit where the resources reserved by DCI or SCI are located.

[0492] Optionally, the SL reference signal satisfies at least one of the following:

[0493] The interval between the SL reference signal and the SL reference signal received by the terminal is determined according to the DCI or SCI indication, or predefined by the protocol, or RRC configuration;

[0494] The interval between the SL reference signal and the SCI received by the terminal is determined according to the DCI or SCI indication, or predefined by the protocol, or RRC configuration.

[0495] Optionally, the resources used by the terminal to transmit the SL reference signal have different bandwidths than the resources used by other terminals to receive the SL reference signal.

[0496] Optionally, the target transmission resource is determined based on the detection or measurement window of the SL reference signal;

[0497] Accordingly, the transmission module 302 is used to detect or measure the SL reference signal within the detection or measurement window of the SL reference signal.

[0498] Optionally, the target transmission resource is determined based on the detection or measurement window of the SL reference signal, wherein the reference signal is located within the detection or measurement window of the SL reference signal.

[0499] Optionally, the transmission power is determined according to at least one of the following:

[0500] Target path loss;

[0501] Power adjustment parameters;

[0502] L1 RSRP measurement or L3 RSRP measurement.

[0503] Optionally, the target path loss includes at least one of the following:

[0504] The path loss between the terminal and the network-side equipment;

[0505] The path loss between the terminal and the receiving terminal, wherein the terminal is the sending terminal;

[0506] The maximum value of multiple path losses between the terminal and multiple other terminals, wherein there is a connection between the terminal and the multiple other terminals;

[0507] The minimum of multiple path losses between the terminal and the plurality of other terminals;

[0508] The average value of multiple path losses between the terminal and the plurality of other terminals;

[0509] The path loss of the terminal that is furthest from the other terminals among the plurality of other terminals;

[0510] The path loss of the terminal closest to the terminal among the plurality of other terminals;

[0511] DL path loss;

[0512] SL path loss;

[0513] Path loss determined according to the configured rules.

[0514] Optionally, the cyclic offset is determined according to at least one of the following:

[0515] Random selection to determine;

[0516] The selection is determined based on the terminal identifier of the terminal;

[0517] Selection is determined based on the source identifier;

[0518] The selection is determined based on the target identifier;

[0519] Select and confirm based on the group identifier;

[0520] The selection is determined based on the PSCCH cyclic redundancy check (CRC).

[0521] The selection is determined based on the resource pool identifier.

[0522] Optionally, the SCI is a first-level SCI or a second-level SCI.

[0523] The reference signal transmission device 300 in the embodiments of this application may be a device, or it may be a component, integrated circuit, or chip in a terminal.

[0524] The reference signal transmission device 300 in this embodiment can be a device with an operating system. This operating system can be Android, iOS, or other possible operating systems; this embodiment does not specifically limit its use.

[0525] The reference signal transmission device 300 provided in this application embodiment can achieve Figure 2 The various processes implemented in the method embodiments achieve the same technical effect, and will not be described again here to avoid repetition.

[0526] Optional, such as Figure 5As shown, this application embodiment also provides a communication device 70, including a processor 71, a memory 72, and a program or instructions stored in the memory 72 and executable on the processor 71. For example, when the communication device 70 is a terminal, the program or instructions executed by the processor 71 implement the above-mentioned... Figure 2 The various processes of the reference signal transmission method embodiment shown can achieve the same technical effect.

[0527] Figure 6 A schematic diagram of the hardware structure of a terminal to implement an embodiment of this application.

[0528] The terminal 1000 includes, but is not limited to, the following components: radio frequency unit 1001, network module 1002, audio output unit 1003, input unit 1004, sensor 1005, display unit 1006, user input unit 1007, interface unit 1008, memory 1009, and processor 1010.

[0529] Those skilled in the art will understand that the terminal 1000 may also include a power supply (such as a battery) for supplying power to various components. The power supply may be logically connected to the processor 1010 through a power management system, thereby enabling functions such as managing charging, discharging, and power consumption through the power management system. Figure 6 The terminal structure shown does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown, or combine certain components, or have different component arrangements, which will not be elaborated here.

[0530] It should be understood that, in this embodiment, the input unit 1004 may include a graphics processing unit (GPU) 10041 and a microphone 10042. The GPU 10041 processes image data of still images or videos obtained by an image capture device (such as a camera) in video capture mode or image capture mode. The display unit 1006 may include a display panel 10061, which may be configured in the form of a liquid crystal display, an organic light-emitting diode, or the like. The user input unit 1007 includes a touch panel 10071 and other input devices 10072. The touch panel 10071 is also called a touch screen. The touch panel 10071 may include a touch detection device and a touch controller. Other input devices 10072 may include, but are not limited to, physical keyboards, function keys (such as volume control buttons, power buttons, etc.), trackballs, mice, and joysticks, which will not be described in detail here.

[0531] In this embodiment, the radio frequency unit 1001 receives downlink data from the network-side device and processes it for the processor 1010; additionally, it sends uplink data to the base station. Typically, the radio frequency unit 1001 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low-noise amplifier, a duplexer, etc.

[0532] The memory 1009 can be used to store software programs or instructions and various data. The memory 1009 may primarily include a program or instruction storage area and a data storage area. The program or instruction storage area may store the operating system, application programs or instructions required for at least one function (such as sound playback, image playback, etc.). Furthermore, the memory 1009 may include high-speed random access memory and non-volatile memory, wherein the non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. For example, at least one disk storage device, flash memory device, or other non-volatile solid-state storage device.

[0533] Processor 1010 may include one or more processing units; optionally, processor 1010 may integrate an application processor and a modem processor, wherein the application processor mainly handles the operating system, user interface, and applications or instructions, and the modem processor mainly handles wireless communication, such as a baseband processor. It is understood that the aforementioned modem processor may also not be integrated into processor 1010.

[0534] The processor 1010 is configured to determine the target transmission resources for transmitting the sublink SL reference signal, wherein the SL reference signal includes a reference signal for positioning.

[0535] Radio frequency unit 1001 is used to transmit SL reference signal through the target transmission resource.

[0536] Optionally, the target transmission resource includes at least one of the following:

[0537] Resources predefined by the protocol;

[0538] Resources configured on network-side devices;

[0539] Resources configured in the terminal or other terminals;

[0540] Resources indicated by network-side devices;

[0541] The resources indicated by the terminal or other terminals;

[0542] Resources determined based on the first mapping relationship between the first resource and the reserved resources;

[0543] Resources determined based on the second mapping relationship between the first resource and the candidate resources;

[0544] Resources determined according to predefined rules in the protocol;

[0545] Resources determined according to the rules configured on the network-side devices;

[0546] Resources determined according to rules configured on the terminal or other terminals;

[0547] Resources determined according to the rules indicated by the network-side devices;

[0548] The first resource includes at least one of the following:

[0549] Physical secondary links share the resources of the PSSCH channel;

[0550] Resources of the Physical Sublink Control Channel (PSCCH);

[0551] PSCCH candidate resources;

[0552] PSSCH candidate resources;

[0553] Resources of the Physical Sublink Feedback Channel (PSFCH);

[0554] PSFCH candidate resources;

[0555] Resources of the Physical Sublink Broadcast Channel (PSBCH);

[0556] Resources for the demodulation reference signal DMRS;

[0557] Resources of Channel State Information Reference Signal (CSI-RS);

[0558] Resources for the Phase Tracking Reference Signal (PTRS).

[0559] Optionally, the target transmission resource can be a periodic resource, a semi-static resource, or an aperiodic resource.

[0560] Optionally, the target transmission resources configured by the terminal or other terminal cover the target transmission resources configured by the network-side device;

[0561] And / or,

[0562] The target transmission resources are covered by the target transmission resources configured by the Radio Resource Control (RRC) as indicated by the Media Access Control Unit (MAC CE), Downlink Control Information (DCI), or Sublink Control Information (SCI).

[0563] Optionally, the network-side device configures at least one style of the target transmission resource for the terminal. The target style of the target transmission resource is determined by a MAC CE indication, DCI indication, or SCI indication sent by the network-side device or the terminal. The target style is one of the at least one styles.

[0564] Optionally, if there is a first mapping relationship between the first resource and the reserved resource, or a second mapping relationship between the first resource and the candidate resource, the target transmission resource is determined according to a predefined and / or detected method.

[0565] Optionally, the target transmission resource satisfies at least one of the following:

[0566] The lowest sub-channel of the target transmission resource is the starting position of the SL reference signal;

[0567] The lowest physical resource block (PRB) corresponding to the lowest sub-channel of the target transmission resource is the starting position of the SL reference signal;

[0568] The highest sub-channel of the target transmission resource is the end position of the SL reference signal;

[0569] The highest PRB corresponding to the highest sub-channel of the target transmission resource is the end position of the SL reference signal.

[0570] Optionally, PSFCH is enabled when the SL reference signal is configured.

[0571] Optionally, the time-domain location of the enabled PSFCH is the time-domain location of the candidate resource of the target transmission resource.

[0572] Optionally, if the first resource includes resources of PSSCH and / or resources of PSCCH, or if the first resource includes candidate resources of PSCCH and / or candidate resources of PSSCH, the target transmission resource is determined based on at least one of detection, the first mapping relationship, and the second mapping relationship.

[0573] Optionally, the target transmission resource is determined according to at least one of the following:

[0574] The period value of the SL reference signal resource;

[0575] The time interval of the SL reference signal resource;

[0576] The number of times the SL reference signal is transmitted;

[0577] The index value of the SL reference signal;

[0578] The detection or measurement window of the SL reference signal;

[0579] The frequency domain resource bandwidth of the SL reference signal;

[0580] Resource pool identifier;

[0581] Repeat factor;

[0582] Identification parameters;

[0583] The priority of the SL reference signal;

[0584] Cyclic offset;

[0585] Transmission power.

[0586] Optionally, if the period value of the SL reference signal resource is 0, the SL reference signal resource is determined according to time domain and / or frequency domain indication, or the transmission of the SL reference signal resource is aperiodic transmission.

[0587] Optionally, the period value of the SL reference signal resource is determined according to at least one of the following:

[0588] Priority of the SL reference signal;

[0589] Quality of Service (QoS)

[0590] Delay;

[0591] Channel Busyness Rate (CBR);

[0592] Channel occupancy rate (CR);

[0593] Reference signal received power RSRP;

[0594] Reference Signal Strength Indicator (RSSI)

[0595] Optionally, the time interval of the SL reference signal resource satisfies at least one of the following:

[0596] The time interval is the interval between the last reserved SL reference signal resources;

[0597] The time interval is the interval between the reserved SL reference signal resources and the resources for the first transmission of the SL reference signal.

[0598] Optionally, the parameters of the detection or measurement window of the SL reference signal include at least one of the following:

[0599] length;

[0600] size;

[0601] Starting position;

[0602] End position;

[0603] The window's lifespan;

[0604] Window spacing;

[0605] Window priority;

[0606] Data priority indicator.

[0607] Optionally, the frequency domain resource bandwidth of the SL reference signal satisfies at least one of the following:

[0608] The frequency domain resource bandwidth is the same as the BWP size of the SL bandwidth portion;

[0609] The bandwidth of the frequency domain resources is the same as the size of the frequency domain resources in the SL resource pool;

[0610] The frequency domain resource bandwidth is within the bandwidth of SL data or SL PSSCH;

[0611] The bandwidth of the frequency domain resources is the same as the bandwidth of the SL data or SL PSSCH;

[0612] The frequency domain resource bandwidth is indicated in terms of PRB or sub-channel granularity.

[0613] Optionally, the priority of the SL reference signal satisfies at least one of the following:

[0614] The priority is a value predefined, configured, or indicated by the protocol;

[0615] The priority is related to the priority of upper-layer services or location services;

[0616] The priority is determined based on the priority of the data packet to be transmitted, the priority of the SL process, the priority of the Hybrid Automatic Repeat Request (HARQ) process, or the priority of the MAC Protocol Data Unit (PDU).

[0617] The priority is determined based on a priority offset value, which is a predefined, preconfigured, configured, or indicated value.

[0618] Optionally, the target transmission resource is determined based on the detection result. If the resource determined by the detection result meets a first condition, the resource determined by the detection result is excluded. The first condition includes at least one of the following:

[0619] SL reference signal resources indicated or reserved in SCI;

[0620] Resources whose RSRP is greater than or equal to the RSRP threshold value;

[0621] Reference signal resources whose overlap with occupied reference signal resources within a time domain unit meets preset conditions.

[0622] Optionally, the RSRP threshold value is determined according to at least one of the following:

[0623] The threshold value is a value predefined, configured, or indicated according to the protocol;

[0624] The threshold value is determined according to the priority mapping rule;

[0625] The threshold value is determined based on the data priority and the RSRP offset value.

[0626] Optionally, the target transmission resource is determined based on the detection result. If the resource determined by the detection result meets the second condition, then the resource determined by the detection result is selected. The second condition includes at least one of the following:

[0627] Resources whose RSRP is less than or equal to the RSRP threshold value;

[0628] Resources in time domain units not reserved by DCI or SCI;

[0629] The remaining resource units (RE, PRB, or sub-channels) within the time domain unit where the resources reserved by DCI or SCI are located.

[0630] Optionally, the SL reference signal satisfies at least one of the following:

[0631] The interval between the SL reference signal and the SL reference signal received by the terminal is determined according to the DCI or SCI indication, or predefined by the protocol, or RRC configuration;

[0632] The interval between the SL reference signal and the SCI received by the terminal is determined according to the DCI or SCI indication, or predefined by the protocol, or RRC configuration.

[0633] Optionally, the resources used by the terminal to transmit the SL reference signal have different bandwidths than the resources used by other terminals to receive the SL reference signal.

[0634] Optionally, the target transmission resource is determined based on the detection or measurement window of the SL reference signal;

[0635] Correspondingly, the radio frequency unit 1001 is used to detect or measure the SL reference signal within the detection or measurement window of the SL reference signal.

[0636] Optionally, the target transmission resource is determined based on the detection or measurement window of the SL reference signal, wherein the reference signal is located within the detection or measurement window of the SL reference signal.

[0637] Optionally, the transmission power is determined according to at least one of the following:

[0638] Target path loss;

[0639] Power adjustment parameters;

[0640] L1 RSRP measurement or L3 RSRP measurement.

[0641] Optionally, the target path loss includes at least one of the following:

[0642] The path loss between the terminal and the network-side equipment;

[0643] The path loss between the terminal and the receiving terminal, wherein the terminal is the sending terminal;

[0644] The maximum value of multiple path losses between the terminal and multiple other terminals, wherein there is a connection between the terminal and the multiple other terminals;

[0645] The minimum of multiple path losses between the terminal and the plurality of other terminals;

[0646] The average value of multiple path losses between the terminal and the plurality of other terminals;

[0647] The path loss of the terminal that is furthest from the other terminals among the plurality of other terminals;

[0648] The path loss of the terminal closest to the terminal among the plurality of other terminals;

[0649] DL path loss;

[0650] SL path loss;

[0651] Path loss determined according to the configured rules.

[0652] Optionally, the cyclic offset is determined according to at least one of the following:

[0653] Random selection to determine;

[0654] The selection is determined based on the terminal identifier of the terminal;

[0655] Selection is determined based on the source identifier;

[0656] The selection is determined based on the target identifier;

[0657] Select and confirm based on the group identifier;

[0658] The selection is determined based on the PSCCH cyclic redundancy check (CRC).

[0659] The selection is determined based on the resource pool identifier.

[0660] Optionally, the SCI is a first-level SCI or a second-level SCI.

[0661] The terminal 1000 provided in the above embodiments can achieve Figure 2 The various processes implemented in the method embodiments achieve the same technical effect, and will not be described again here to avoid repetition.

[0662] This application embodiment also provides a readable storage medium storing a program or instructions that are executed by a processor. Figure 2 The various processes in the method embodiments described herein can achieve the same technical effect, and will not be repeated here to avoid repetition.

[0663] The processor mentioned above is the processor in the terminal or network-side device described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0664] This application embodiment also provides a chip, the chip including a processor and a communication interface, the communication interface being coupled to the processor, the processor being used to run network-side device programs or instructions to achieve the above-mentioned... Figure 2 The various processes in the method embodiments can achieve the same technical effect, and will not be described again here to avoid repetition.

[0665] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0666] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0667] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, air conditioner, or network, etc.) to execute the methods described in the various embodiments of this application.

[0668] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A method for transmitting a reference signal, characterized in that, include: The terminal determines the target transmission resource for transmitting the sublink SL reference signal, the SL reference signal including a reference signal for positioning; The terminal transmits the SL reference signal through the target transmission resource; The target transmission resource is determined based on at least one of the following: the frequency domain resource bandwidth of the SL reference signal; and the transmission power. The frequency domain resource bandwidth of the SL reference signal satisfies at least one of the following: The bandwidth of the frequency domain resources is the same as the size of the frequency domain resources in the SL resource pool; The bandwidth of the frequency domain resources is the same as that of the SL data or SL PSSCH.

2. The method according to claim 1, characterized in that, The target transmission resource includes at least one of the following: Resources predefined by the protocol; Resources configured on network-side devices; Resources configured in the terminal or other terminals; Resources indicated by network-side devices; The resources indicated by the terminal or other terminals; Resources determined based on the first mapping relationship between the first resource and the reserved resources; Resources determined based on the second mapping relationship between the first resource and the candidate resources; Resources determined according to predefined rules in the protocol; Resources determined according to the rules configured on the network-side devices; Resources determined according to rules configured on the terminal or other terminals; Resources determined according to the rules indicated by the network-side devices; The first resource includes at least one of the following: Physical secondary links share the resources of the PSSCH channel; Resources of the Physical Sublink Control Channel (PSCCH); PSCCH candidate resources; PSSCH candidate resources; Resources of the Physical Sublink Feedback Channel (PSFCH); PSFCH candidate resources; Resources of the Physical Sublink Broadcast Channel (PSBCH); Resources for the demodulation reference signal DMRS; Resources of Channel State Information Reference Signal (CSI-RS); Resources for the Phase Tracking Reference Signal (PTRS).

3. The method according to claim 1, characterized in that, The target transmission resource is a periodic resource, a semi-static resource, or an aperiodic resource.

4. The method according to claim 2, characterized in that, The target transmission resources configured in the terminal or other terminal cover the target transmission resources configured in the network-side device. And / or, The target transmission resources indicated by the Media Access Control Unit (MAC CE), Downlink Control Information (DCI), or Sublink Control Information (SCI) cover the target transmission resources configured by the Radio Resource Control (RRC).

5. The method according to claim 2, characterized in that, The network-side device configures at least one style of the target transmission resource for the terminal. The target style of the target transmission resource is determined by a MACCE indication, a DCI indication, or an SCI indication sent by the terminal, and the target style is one of the at least one styles.

6. The method according to claim 2, characterized in that, If there is a first mapping relationship between the first resource and the reserved resource, or a second mapping relationship between the first resource and the candidate resource, the target transmission resource is determined according to predefined and / or detection.

7. The method according to claim 1, characterized in that, The target transmission resource satisfies at least one of the following: The lowest sub-channel of the target transmission resource is the starting position of the SL reference signal; The lowest physical resource block (PRB) corresponding to the lowest sub-channel of the target transmission resource is the starting position of the SL reference signal; The highest sub-channel of the target transmission resource is the end position of the SL reference signal; The highest PRB corresponding to the highest sub-channel of the target transmission resource is the end position of the SL reference signal.

8. The method according to claim 1, characterized in that, When the SL reference signal is configured, enable PSFCH.

9. The method according to claim 8, characterized in that, The time-domain location of the enabled PSFCH is the time-domain location of the candidate resource of the target transmission resource.

10. The method according to claim 2, characterized in that, When the first resource includes resources of PSSCH and / or resources of PSCCH, or when the first resource includes candidate resources of PSCCH and / or candidate resources of PSSCH, the target transmission resource is determined based on at least one of detection, the first mapping relationship, and the second mapping relationship.

11. The method according to claim 1, characterized in that, The target transmission resource is also determined according to at least one of the following: The period value of the SL reference signal resource; The time interval of the SL reference signal resource; The number of times the SL reference signal is transmitted; The index value of the SL reference signal; The detection or measurement window of the SL reference signal; Resource pool identifier; Repeat factor; Identification parameters; The priority of the SL reference signal; Cyclic offset.

12. The method according to claim 11, characterized in that, When the period value of the SL reference signal resource is 0, the SL reference signal resource is determined according to time domain and / or frequency domain indication, or the transmission of the SL reference signal resource is aperiodic transmission.

13. The method according to claim 11, characterized in that, The period value of the SL reference signal resource is determined according to at least one of the following: Priority of the SL reference signal; Quality of Service (QoS) Delay; Channel Busyness Rate (CBR); Channel occupancy rate (CR); Reference signal received power RSRP; Reference Signal Strength Indicator (RSSI) 14. The method according to claim 11, characterized in that, The time interval of the SL reference signal resource satisfies at least one of the following: The time interval is the interval between the last reserved SL reference signal resources; The time interval is the interval between the reserved SL reference signal resources and the resources for the first transmission of the SL reference signal.

15. The method according to claim 11, characterized in that, The parameters of the detection or measurement window of the SL reference signal include at least one of the following: length; size; Starting position; End position; The window's lifespan; Window spacing; Window priority; Data priority indicator.

16. The method according to claim 11, characterized in that, The frequency domain resource bandwidth of the SL reference signal also satisfies at least one of the following: The frequency domain resource bandwidth is the same as the BWP size of the SL bandwidth portion; The frequency domain resource bandwidth is within the bandwidth of SL data or SL PSSCH; The frequency domain resource bandwidth is indicated in terms of PRB or sub-channel granularity.

17. The method according to claim 11, characterized in that, The priority of the SL reference signal satisfies at least one of the following: The priority is a value predefined, configured, or indicated by the protocol; The priority is related to the priority of upper-layer services or location services; The priority is determined based on the priority of the data packet to be transmitted, the priority of the SL process, the priority of the Hybrid Automatic Repeat Request (HARQ) process, or the priority of the MAC Protocol Data Unit (PDU). The priority is determined based on a priority offset value, which is a predefined, configured, or indicated value.

18. The method according to claim 1, characterized in that, The target transmission resource is determined based on the detection result. If the resource determined by the detection result meets a first condition, the resource determined by the detection result is excluded. The first condition includes at least one of the following: SL reference signal resources indicated or reserved in SCI; Resources whose RSRP is greater than or equal to the RSRP threshold value; Reference signal resources whose overlap with occupied reference signal resources within a time domain unit meets preset conditions.

19. The method according to claim 18, characterized in that, The RSRP threshold value is determined based on at least one of the following: The threshold value is a value predefined, configured, or indicated according to the protocol; The threshold value is determined according to the priority mapping rule; The threshold value is determined based on the data priority and the RSRP offset value.

20. The method according to claim 1, characterized in that, The target transmission resource is determined based on the detection results. If the resource determined by the detection results meets the second condition, then the resource determined by the detection results is selected. The second condition includes at least one of the following: Resources whose RSRP is less than or equal to the RSRP threshold value; Resources in time domain units not reserved by DCI or SCI; The remaining resource units (RE, PRB, or sub-channels) within the time domain unit where the resources reserved by DCI or SCI are located.

21. The method according to claim 1, characterized in that, The SL reference signal satisfies at least one of the following: The interval between the SL reference signal and the SL reference signal received by the terminal is determined according to the DCI or SCI indication, or predefined by the protocol, or RRC configuration; The interval between the SL reference signal and the SCI received by the terminal is determined according to the DCI or SCI indication, or predefined by the protocol, or RRC configuration.

22. The method according to claim 21, characterized in that, The resources used by the terminal to transmit SL reference signals have different bandwidths than the resources used by other terminals to receive SL reference signals.

23. The method according to claim 11, characterized in that, The target transmission resource is determined based on the detection or measurement window of the SL reference signal; The terminal transmits the SL reference signal through the target transmission resource, including: The terminal detects or measures the SL reference signal within the detection or measurement window of the SL reference signal.

24. The method according to claim 11, characterized in that, The target transmission resource is determined based on the detection or measurement window of the SL reference signal, wherein the reference signal is located within the detection or measurement window of the SL reference signal.

25. The method according to claim 11, characterized in that, The transmission power is determined according to at least one of the following: Target path loss; Power adjustment parameters; L1 RSRP measurement or L3 RSRP measurement.

26. The method according to claim 25, characterized in that, The target path loss includes at least one of the following: The path loss between the terminal and the network-side equipment; The path loss between the terminal and the receiving terminal, wherein the terminal is the sending terminal; The maximum value of multiple path losses between the terminal and multiple other terminals, wherein there is a connection between the terminal and the multiple other terminals; The minimum of multiple path losses between the terminal and the plurality of other terminals; The average value of multiple path losses between the terminal and the plurality of other terminals; The path loss of the terminal that is furthest from the other terminals among the plurality of other terminals; The path loss of the terminal closest to the terminal among the plurality of other terminals; DL path loss; SL path loss; Path loss determined according to the configured rules.

27. The method according to claim 11, characterized in that, The cyclic offset is determined based on at least one of the following: Random selection to determine; The selection is determined based on the terminal identifier of the terminal; Selection is determined based on the source identifier; The selection is determined based on the target identifier; Select and confirm based on the group identifier; The selection is determined based on the PSCCH cyclic redundancy check (CRC). The selection is determined based on the resource pool identifier.

28. The method according to claim 4, 5, 18, 20 or 21, characterized in that, The SCI is either a Level 1 SCI or a Level 2 SCI.

29. A reference signal transmission device, characterized in that, include: A determination module is used to determine the target transmission resources for transmitting the sublink SL reference signal, the SL reference signal including a reference signal for positioning; The transmission module is used to transmit the SL reference signal through the target transmission resource; The target transmission resource is determined based on at least one of the following: the frequency domain resource bandwidth of the SL reference signal; and the transmission power. The frequency domain resource bandwidth of the SL reference signal satisfies at least one of the following: The bandwidth of the frequency domain resources is the same as the size of the frequency domain resources in the SL resource pool; The bandwidth of the frequency domain resources is the same as that of the SL data or SL PSSCH.

30. The apparatus according to claim 29, characterized in that, The target transmission resource includes at least one of the following: Resources predefined by the protocol; Resources configured on network-side devices; Resources configured on the terminal or other terminals; Resources indicated by network-side devices; Resources indicated by a terminal or other terminal; Resources determined based on the first mapping relationship between the first resource and the reserved resources; Resources determined based on the second mapping relationship between the first resource and the candidate resources; Resources determined according to predefined rules in the protocol; Resources determined according to the rules configured on the network-side devices; Resources determined according to rules configured on the terminal or other terminals; Resources determined according to the rules indicated by the network-side devices; The first resource includes at least one of the following: Physical secondary links share the resources of the PSSCH channel; Resources of the Physical Sublink Control Channel (PSCCH); PSCCH candidate resources; PSSCH candidate resources; Resources of the Physical Sublink Feedback Channel (PSFCH); PSFCH candidate resources; Resources of the Physical Sublink Broadcast Channel (PSBCH); Resources for the demodulation reference signal DMRS; Resources of Channel State Information Reference Signal (CSI-RS); Resources for the Phase Tracking Reference Signal (PTRS).

31. The apparatus according to claim 29, characterized in that, The target transmission resource is also determined according to at least one of the following: The period value of the SL reference signal resource; The time interval of the SL reference signal resource; The number of times the SL reference signal is transmitted; The index value of the SL reference signal; The detection or measurement window of the SL reference signal; Resource pool identifier; Repeat factor; Identification parameters; The priority of the SL reference signal; Cyclic offset.

32. A terminal, characterized in that, It includes a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the method for transmitting a reference signal as claimed in any one of claims 1 to 28.

33. A readable storage medium, characterized in that, The readable storage medium stores a program or instructions that, when executed by a processor, implement the steps of the method for transmitting a reference signal as described in any one of claims 1 to 28.

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