Lateral control information sending method and device, equipment and medium

Abstract

The invention discloses a sidewalk control information sending method and device, equipment and a medium, and relates to the field of wireless communication. The method is applied to a terminal, and the method comprises: transmitting, according to a network configuration or pre-configuration, an SL PRS and sideward control information SCI, the SCI being used for indicating a resource reservation condition of the SL PRS (210). According to the method, conflicts between SL PRS sending resources and SL-U communication resources can be reduced.

Description

Method, device, equipment and medium for transmitting side control information Technical Field

[0001] The present application relates to the field of wireless communications, and in particular to a method, apparatus, device, and medium for transmitting side control information. Background Art

[0002] When SL (SideLink) PRS (Positioning Reference Signal) is sent on an unlicensed spectrum, if the SL PRS resource pool used to send SL PRS is the same as the SL-U communication resource pool used for SL-U (SideLink-Unlicense) communication, or the SL PRS resource pool and the SL-U communication resource pool are not exactly the same but there is resource overlap, how to reduce the conflict between SL PRS sending resources and SL-U communication resources is an urgent problem to be solved.

[0003] Summary of the Invention

[0004] The embodiments of the present application provide a method, apparatus, device, and medium for transmitting sideline control information, which can reduce the conflict between SL PRS transmission resources and SL-U communication resources. The technical solution is as follows:

[0005] According to one aspect of the present application, a method for sending sideline control information is provided, which is applied to a terminal, and the method includes:

[0006] According to network configuration or pre-configuration, SL PRS and sideline control information SCI are sent, and the SCI is used to indicate the resource reservation status of SL PRS.

[0007] According to one aspect of the present application, a device for transmitting side control information is provided, the device comprising:

[0008] The sending module is used to send SL PRS and side control information SCI according to network configuration or pre-configuration, and the SCI is used to indicate the resource reservation status of SL PRS.

[0009] According to one aspect of the present application, a terminal is provided, comprising: a processor and a transceiver connected to the processor; wherein,

[0010] The transceiver is used to send the SL PRS and sideline control information SCI according to network configuration or pre-configuration, and the SCI is used to indicate the resource reservation status of the SL PRS.

[0011] According to one aspect of the present application, a terminal is provided, comprising: a processor and a memory, wherein the memory stores at least one instruction, at least one program, a code set, or an instruction set, and the at least one instruction, the at least one program, the code set, or the instruction set is loaded and executed by the processor to implement the method for sending side control information as described in the above aspect.

[0012] According to one aspect of the present application, a computer-readable storage medium is provided, in which executable instructions are stored. The executable instructions are loaded and executed by a processor to enable a communication device to implement the method for sending side control information as described in the above aspect.

[0013] According to one aspect of an embodiment of the present application, a chip is provided, which includes a programmable logic circuit and / or program instructions. When the chip runs on a communication device, it is used to enable the communication device to implement the method for sending side control information described in the above aspect.

[0014] According to one aspect of the present application, a computer program product is provided. When the computer program product is executed on a processor of a communication device, the communication device executes the method for sending sidelink control information described in the above aspect.

[0015] The technical solutions provided by the embodiments of the present application include at least the following beneficial effects:

[0016] Since some terminals (backward terminals) cannot recognize the SCI (Sidelink Control Information) (or SCI-P (SCI for Positioning)) used to indicate the SL PRS resource reservation status, if the terminal sends SCI-P to reserve some resources for SL PRS, the backward terminal cannot know that these resources have been occupied, and the backward terminal may still select these resources for SL-U communication, resulting in a transmission conflict between SL-U communication and SL PRS. In order to avoid the transmission conflict between SL-U communication and SL PRS, the terminal sending SL PRS can determine the resource reservation status of SL PRS based on network configuration or pre-configuration; wherein the network configuration or pre-configuration is determined by the network equipment based on the reservation status of the SL PRS resource pool and the SL-U communication resource pool. If there is resource overlap between the SL PRS resource pool and the SL-U communication resource pool, the overlapping resources do not need to be reserved for SL PRS; if there are non-overlapping resources between the SL PRS resource pool and the SL-U communication resource pool, the non-overlapping resources can be reserved for SL PRS, thereby reducing the mutual interference between SL PRS and SL-U data and improving the positioning accuracy of the SL PRS system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] FIG1 is a schematic diagram of a communication system provided by an exemplary embodiment of the present application;

[0019] FIG2 is a schematic diagram of side communication provided by an exemplary embodiment of the present application;

[0020] FIG3 is a schematic diagram of side communication provided by an exemplary embodiment of the present application;

[0021] FIG4 is a schematic diagram of sideline communication provided by an exemplary embodiment of the present application;

[0022] FIG5 is a schematic diagram of a method for transmitting side control information provided by an exemplary embodiment of the present application;

[0023] FIG6 is a schematic diagram of a method for transmitting side control information provided by an exemplary embodiment of the present application;

[0024] FIG7 is a schematic diagram of a method for transmitting side control information provided by an exemplary embodiment of the present application;

[0025] FIG8 is a schematic diagram of a method for transmitting side control information provided by an exemplary embodiment of the present application;

[0026] FIG9 is a schematic diagram of a method for transmitting side control information provided by an exemplary embodiment of the present application;

[0027] FIG10 is a schematic diagram of a method for transmitting side control information provided by an exemplary embodiment of the present application;

[0028] FIG11 is a schematic diagram of a method for transmitting side control information provided by an exemplary embodiment of the present application;

[0029] FIG12 is a schematic diagram of a method for transmitting side control information provided by an exemplary embodiment of the present application;

[0030] FIG13 is a schematic diagram of a method for transmitting side control information provided by an exemplary embodiment of the present application;

[0031] FIG14 is a schematic diagram of a method for transmitting side control information provided by an exemplary embodiment of the present application;

[0032] FIG15 is a schematic diagram of a method for transmitting side control information provided by an exemplary embodiment of the present application;

[0033] FIG16 is a flowchart of a method for transmitting side control information provided by an exemplary embodiment of the present application;

[0034] FIG17 is a schematic diagram of a method for transmitting side control information provided by an exemplary embodiment of the present application;

[0035] FIG18 is a schematic diagram of a method for transmitting side control information provided by an exemplary embodiment of the present application;

[0036] FIG19 is a schematic diagram of a method for transmitting side control information provided by an exemplary embodiment of the present application;

[0037] FIG20 is a schematic diagram of a method for transmitting side control information provided by an exemplary embodiment of the present application;

[0038] FIG21 is a flowchart of a method for transmitting side control information provided by an exemplary embodiment of the present application;

[0039] FIG22 is a flowchart of a method for transmitting side control information provided by an exemplary embodiment of the present application;

[0040] FIG23 is a schematic diagram of a method for transmitting side control information provided by an exemplary embodiment of the present application;

[0041] FIG24 is a flowchart of a method for transmitting side control information provided by an exemplary embodiment of the present application;

[0042] FIG25 is a flowchart of a method for transmitting side control information provided by an exemplary embodiment of the present application;

[0043] FIG26 is a schematic diagram of a method for transmitting side control information provided by an exemplary embodiment of the present application;

[0044] FIG27 is a schematic diagram of a method for transmitting side control information provided by an exemplary embodiment of the present application;

[0045] FIG28 is a schematic diagram of a method for transmitting side control information provided by an exemplary embodiment of the present application;

[0046] FIG29 is a schematic diagram of a method for transmitting side control information provided by an exemplary embodiment of the present application;

[0047] FIG30 is a flowchart of a method for transmitting side control information provided by an exemplary embodiment of the present application;

[0048] FIG31 is a schematic diagram of a method for transmitting side control information provided by an exemplary embodiment of the present application;

[0049] FIG32 is a schematic diagram of a method for transmitting side control information provided by an exemplary embodiment of the present application;

[0050] FIG33 is a schematic diagram of a method for transmitting side control information provided by an exemplary embodiment of the present application;

[0051] FIG34 is a structural block diagram of a device for transmitting side control information provided by an exemplary embodiment of the present application;

[0052] FIG35 is a schematic structural diagram of a communication device provided by an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0053] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0054] The network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. A person skilled in the art will appreciate that, with the evolution of the network architecture and the emergence of new business scenarios, the technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.

[0055] It should be understood that the "indication" mentioned in the embodiments of this application can be a direct indication, an indirect indication, or an indication of an association. For example, "A indicates B" can mean that A directly indicates B, for example, B can be obtained through A; it can also mean that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also mean that there is an association between A and B.

[0056] In the description of the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between the two, or an association relationship between the two, or a relationship between indication and being indicated, configuration and being configured, etc.

[0057] In the embodiments of the present application, "predefined" can be implemented by pre-storing corresponding codes, tables, or other methods that can be used to indicate relevant information in a device (for example, a terminal and a network device), and the present application does not limit the specific implementation method. For example, predefined can refer to information defined in a protocol.

[0058] Please refer to FIG1 , which shows a schematic diagram of a network architecture 100 provided by an embodiment of the present application. The network architecture 100 may include: a terminal 10 , an access network device 20 , and a core network device 30 .

[0059] The terminal 10 may refer to a user equipment (UE), an access terminal, a user unit, a user station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a wireless communication device, a user agent, or a user device. Optionally, the terminal 10 may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal in the fifth generation mobile communication system (5GS) or a terminal in the future evolved public land mobile communication network (PLMN), etc., and the embodiments of the present application are not limited to this. For the convenience of description, the above-mentioned devices are collectively referred to as terminals. The number of terminals 10 is usually multiple, and one or more terminals 10 can be distributed in each cell managed by the access network device 20.

[0060] The access network device 20 is a device deployed in the access network to provide wireless communication functions for the terminal 10. The access network device 20 may include various forms of macro base stations, micro base stations, relay stations, access points, etc. In systems using different wireless access technologies, the names of devices with access network device functions may be different. For example, in the 5G NR system, it is called gNodeB or gNB (next Generation Node B, next generation node B (or new generation access network node)). With the evolution of communication technology, the name "access network device" may change. For the convenience of description, in the embodiments of the present application, the above-mentioned devices that provide wireless communication functions for the terminal 10 are collectively referred to as access network devices. Optionally, a communication relationship can be established between the terminal 10 and the core network device 30 through the access network device 20. For example, in a Long Term Evolution (LTE) system, the access network device 20 may be an Evolved Universal Terrestrial Radio Access Network (EUTRAN) or one or more eNodeBs in the EUTRAN. In a 5G NR system, the access network device 20 may be a Radio Access Network (RAN) or one or more gNBs in the RAN. In the embodiments of the present application, unless otherwise specified, the network device referred to herein refers to the access network device 20, such as a base station.

[0061] The core network device 30 is a device deployed in the core network. The function of the core network device 30 is mainly to provide user connection, user management, and service carrying, and to provide an interface to the external network as a bearer network. For example, the core network equipment in the 5G NR system may include an access and mobility management function (AMF) network element, an authentication server function (AUSF) network element, a user plane function (UPF) network element, a session management function (SMF) network element, a location management function (LMF) network element, a policy control function (PCF) network element, a unified data management (UDM) network element, etc.

[0062] In one example, the access network device 20 and the core network device 30 communicate with each other via an interface technology, such as the NG interface in the 5G NR system. The access network device 20 and the terminal 10 communicate with each other via an air interface technology, such as the Uu interface.

[0063] Access network equipment is the device that allows terminals to access the network architecture wirelessly. It is primarily responsible for radio resource management, Quality of Service (QoS) management, data compression and encryption, etc. on the air interface side. Examples include NodeBs, evolved eNodeBs, base stations in 5G mobile communication systems or next-generation wireless (NR) communication systems, and base stations in future mobile communication systems.

[0064] The core network equipment includes NSSF (Network Slice Selection Function), AUSF (Authentication Server Function), UDM (Unified Data Management), AMF (Access and Mobility Management Function), SMF (Session Management Function), PCF (Policy Control Function), and UPF (User Plane Function).

[0065] The UE establishes an access layer connection with the (R)AN (Access Network) through the Uu interface, exchanging access layer messages and wireless data transmission. The UE establishes a non-access layer (None Access Stratum, NAS) connection with the AMF through the N1 interface, exchanging NAS messages. The AMF is the mobility management function in the core network, and the SMF is the session management function in the core network. In addition to managing the mobility of the UE, the AMF is also responsible for forwarding session management-related messages between the UE and the SMF. The PCF is the policy management function in the core network, responsible for formulating policies related to the mobility management, session management, and billing of the UE. The PCF transmits data with the external application function (AF) through the N5 interface. The UPF is a user plane function in the core network, which transmits data with the external data network (DN) through the N6 interface and with the AN through the N3 interface.

[0066] The "5G NR system" in the embodiments of the present application may also be referred to as a 5G system or an NR system, but those skilled in the art will understand its meaning. The technical solutions described in the embodiments of the present application may be applicable to LTE systems, 5G NR systems, subsequent evolution systems of 5G NR systems, and other communication systems such as Narrow Band Internet of Things (NB-IoT) systems, and this application does not limit this.

[0067] First, the relevant content is introduced.

[0068] SL transmission technology: Unlike traditional cellular systems where communication data is received or sent through access network equipment, SL (Sidelink) transmission refers to direct communication data transmission between terminals through sidelinks. Regarding SL transmission, 3GPP (3rd Generation Partnership Project) defines two transmission modes: Mode A and Mode B. Mode A: The transmission resources of SL UE (User Equipment) are allocated by the access network equipment. The SL UE transmits communication data on the sidelink according to the transmission resources allocated by the access network equipment. The access network equipment can allocate transmission resources for single transmission to the SL UE, or allocate transmission resources for semi-static transmission to the SL UE. Mode B: The SL UE selects one or more transmission resources in the resource pool to transmit communication data. The SL UE can select transmission resources in the resource pool by listening, or select transmission resources in the resource pool by random selection. When SL transmission is performed on the unlicensed spectrum, the access network equipment can pre-configure multiple resource pools (SL PRS resource pool, SL-U communication resource pool, etc.) for the UE. When executing specific services, the UE can select resources from the corresponding resource pool to perform the LBT (Listen Before Talk) process. If the LBT is successful, the UE can occupy this part of the resources for side transmission on the unlicensed spectrum. When the UE sends side data on this part of the resources, it also sends SCI. SCI indicates the resources occupied by the UE's current side transmission. In addition, SCI can also be used to indicate the resources reserved by the UE. For example, if the UE occupies a part of the resources in the SL PRS resource pool through LBT to send SL PRS, the UE sends SL PRS and SCI-P on this part of the resources. SCI-P indicates the resources occupied by this SL PRS and the resources reserved for subsequent SL PRS.

[0069] In SideLink (SL) transmission, according to the network coverage of the communicating terminals, it can be divided into sidelink communication within the network coverage, sidelink communication with partial network coverage, and sidelink communication outside the network coverage, as shown in Figures 2, 3 and 4 respectively.

[0070] Figure 2: In sideline communications within network coverage, all terminals 21 performing sideline communications are within the coverage of the same base station 10. Therefore, the above terminals 21 can all perform sideline communications based on the same sideline configuration by receiving configuration signaling from the base station 10.

[0071] Figure 3: In the case of partial network coverage and sidelink communication, some terminals 21 performing sidelink communication are within the coverage of the base station 10. These terminals 21 can receive configuration signaling from the base station 10 and perform sidelink communication according to the configuration of the base station 10. However, terminals 22 outside the network coverage cannot receive configuration signaling from the base station 10. In this case, the terminal 22 outside the network coverage will determine the sidelink configuration based on pre-configuration information and information carried in the Physical Sidelink Broadcast Channel (PSBCH) sent by the terminal 21 within the network coverage, and perform sidelink communication.

[0072] Figure 4: For sideline communication outside the network coverage, all terminals 22 performing sideline communication are located outside the network coverage, and all terminals 22 determine the sideline configuration according to the pre-configured information to perform sideline communication.

[0073] Vehicle-to-everything (V2X) is a key technology for future intelligent transportation systems. Research focuses on vehicle data transmission solutions based on 3GPP communication protocols. V2X communications include vehicle-to-vehicle (V2V), vehicle-to-roadside infrastructure (V2I), and vehicle-to-pedestrian (V2P). V2X applications will improve driving safety, reduce congestion and vehicle energy consumption, and increase traffic efficiency.

[0074] NR-V2X time slot structure

[0075] In NR-V2X, the PSSCH (Physical Sidelink Shared Channel) and its associated PSCCH (Physical Sidelink Control Channel) are transmitted in the same time slot, with the PSCCH occupying two or three time domain symbols. NR-V2X time domain resource allocation uses time slots as the granularity. The starting point and length of the time domain symbols used for sidelink transmission in a time slot are configured by the parameters sl-startSLsymbols (sidelink - sidelink start symbol) and sl-lengthSLsymbols (sidelink - sidelink symbol length). The last symbol in this part of symbols is used as GP (Guard Period). PSSCH and PSCCH can only use the remaining time domain symbols. However, if PSFCH (Physical Sidelink Feedback Channel) transmission resources are configured in a time slot, PSSCH and PSCCH cannot occupy the time domain symbols used for PSFCH transmission, as well as the AGC (Automatic Gain Control) and GP symbols before the symbol.

[0076] As shown in Figure 5, the network configuration sl-StartSymbol (sideline start symbol) = 3, sl-LengthSymbols (sideline symbol length) = 11, that is, the 11 time domain symbols starting from symbol index 3 in a time slot can be used for sideline transmission. There are PSFCH transmission resources in the time slot. The PSFCH occupies symbols 11 and 12, among which symbol 11 is used as the AGC symbol of PSFCH, and symbols 10 and 13 are used as GPs respectively. The time that can be used for PSSCH transmission is symbol 3 to symbol 9, and PSCCH occupies 3 time domain symbols, namely symbols 3, 4, and 5. Symbol 3 is usually used as an AGC symbol.

[0077] In NR-V2X, a sidelink timeslot contains not only the PSCCH and PSSCH but also the PSFCH, as shown in Figure 6. As can be seen, within a timeslot, the first OFDM (Orthogonal Frequency Division Multiplexing) symbol is used exclusively for automatic gain control (AGC). During this AGC symbol, the UE replicates the information sent on the second symbol. The last symbol of the timeslot is reserved for the transmit / receive transition, allowing the UE to switch from transmit (or receive) to receive (or transmit) mode. Within the remaining OFDM symbols, the PSCCH can occupy two or three OFDM symbols, starting with the second sidelink symbol. In the frequency domain, the number of PRBs (Physical Resource Blocks) occupied by the PSCCH falls within the range of a PSSCH subband. If the number of PRBs occupied by the PSCCH is smaller than the size of a PSSCH subchannel, or if the PSSCH's frequency domain resources include multiple subchannels, the PSCCH can be frequency-division multiplexed with the PSSCH in the same OFDM symbol as the PSCCH.

[0078] The DMRS (Demodulation Reference Signal) of the PSSCH in NR-V2X draws on the design of the NR Uu interface and adopts multiple time-domain PSSCH DMRS patterns. In a resource pool, the number of available DMRS patterns is related to the number of PSSCH symbols in the resource pool. For a specific number of PSSCH symbols (including the first AGC symbol) and PSCCH symbols, the available DMRS patterns and the position of each DMRS symbol in the pattern are shown in Table 1. Figure 7 shows a schematic diagram of the time-domain position of 4 DMRS symbols when the PSSCH has 13 symbols. That is, when the number of PSSCH symbols is 13, the number of PSCCH symbols is 2, and the number of DMRS symbols is 4, the DMRS symbol positions are located at symbols 1, 4, 7, and 10, respectively.

[0079] Table 1 Number and position of DMRS symbols under different PSSCH and PSCCH symbol numbers

[0080]

[0081] If multiple time-domain DMRS patterns are configured within the resource pool, the transmitting UE selects the specific time-domain DMRS pattern to use and indicates this in the first-order SCI. This design allows high-speed UEs to select a high-density DMRS pattern, thereby ensuring accurate channel estimation, while low-speed UEs can use a low-density DMRS pattern, thereby improving spectrum efficiency.

[0082] The generation method of the PSSCH DMRS sequence is almost identical to that of the PSCCH DMRS sequence. The only difference is the initialization formula c(m) of the pseudo-random sequence. init middle, p i The i-th CRC (Cyclic Redundancy Check) of the PSCCH that schedules the PSSCH, where L=24 is the number of bits of the PSCCH CRC.

[0083] NR PDSCH and PUSCH support two frequency domain DMRS patterns, namely DMRS frequency domain type 1 and DMRS frequency domain type 2. For each frequency domain type, there are two different types: single DMRS symbol and double DMRS symbol. Single symbol DMRS frequency domain type 1 supports 4 DMRS ports, single symbol DMRS frequency domain type 2 can support 6 DMRS ports, and in the case of double DMRS symbols, the number of supported ports is doubled. However, in NR-V2X, since PSSCH only needs to support a maximum of two DMRS ports, only single symbol DMRS frequency domain type 1 is supported, as shown in Figure 8.

[0084] Determination of NR-V2X frequency domain resources

[0085] Similar to LTE (Long Term Evolution)-V2X, the frequency domain resources of the NR-V2X resource pool are also continuous, and the allocation granularity of the frequency domain resources is also sub-channel. The number of PRBs included in a sub-channel is {10, 12, 15, 20, 50, 75, 100}, among which the minimum sub-channel size is 10PRB, which is much larger than the minimum sub-channel size of 4PRB in LTE-V2X. This is mainly because the frequency domain resources of PSCCH in NR-V2X are located in the first sub-channel of the PSSCH associated with it. The frequency domain resources of PSCCH are less than or equal to the size of a sub-channel of PSSCH, while the time domain resources of PSCCH occupy 2 or 3 OFDM symbols. If the sub-channel size is configured to be relatively small, the available resources of PSCCH will be very few, the code rate will increase, and the detection performance of PSCCH will be reduced. In NR-V2X, the size of the PSSCH subchannel and the frequency domain resource size of the PSCCH are configured independently, but the frequency domain resource of the PSCCH must be less than or equal to the subchannel size of the PSSCH.

[0086] The following configuration parameters in the NR-V2X resource pool configuration information are used to determine the frequency domain resources of the PSCCH and PSSCH resource pools:

[0087] Subchannel size (sl-SubchannelSize): indicates the number of consecutive PRBs included in a subchannel in the resource pool, and the value range is {10, 12, 15, 20, 50, 75, 100} PRBs;

[0088] Number of subchannels (sl-NumSubchannel): indicates the number of subchannels included in the resource pool;

[0089] sl-StartRB-Subchannel: indicates the starting PRB index of the first subchannel in the resource pool.

[0090] PRB number (sl-RB-Number): indicates the number of consecutive PRBs included in the resource pool;

[0091] PSCCH frequency domain resource indication (sl-FreqResourcePSCCH): indicates the frequency domain resource size of PSCCH, and the value range is {10, 12, 15, 20, 25} PRB;

[0092] When the UE determines the resource pool for PSSCH transmission or PSSCH reception, the frequency domain resources included in the resource pool are sl-NumSubchannel consecutive subchannels starting from the PRB indicated by sl-StartRB-Subchannel. If the number of PRBs contained in the final sl-NumSubchannel consecutive subchannels is less than the number of PRBs indicated by sl-RB-Number, the remaining PRBs cannot be used for PSSCH transmission or reception.

[0093] In NR-V2X, as shown in Figure 9, the frequency domain starting position of the first subchannel of the PSCCH and its associated PSSCH is aligned. Therefore, the starting position of each PSSCH subchannel is the possible frequency domain starting position of the PSCCH. The frequency domain range of the resource pool of PSCCH and PSSCH can be determined according to the above parameters.

[0094] In NR-V2X, the PSCCH is used to carry side control information related to resource sensing, including:

[0095] The priority of the scheduled transmission;

[0096] Frequency domain resource allocation, indicating the number of frequency domain resources of PSSCH in the current time slot scheduled by PSCCH, and the number and starting position of frequency domain resources of up to two retransmission resources reserved;

[0097] Time domain resource allocation, indicating the time domain locations of up to two retransmission resources;

[0098] Reference signal pattern for PSSCH;

[0099] Second level SCI format;

[0100] Second-order SCI rate offset;

[0101] Number of PSSCH DMRS ports;

[0102] Modulation and Coding Scheme (MCS);

[0103] MCS form instructions;

[0104] Number of PSFCH symbols;

[0105] Resource reservation period, reserves resources for another TB to send in the next period. If inter-TB (Transport Block) resource reservation is not activated in the resource pool configuration, this information bit field does not exist.

[0106] Reserved bits: 2 to 4 bits. The specific number of bits is configured or pre-configured by the network.

[0107] Since the PSCCH is always transmitted in the same time slot as the scheduled PSSCH, and the starting position of the PRB occupied by the PSCCH is the starting position of the first subchannel of the scheduled PSSCH, the SCI format 1-A does not explicitly indicate the time-frequency domain starting position of the scheduled PSSCH.

[0108] Determination of NR-V2X time domain resources (time slots)

[0109] In NR-V2X, the transmission of PSCCH / PSSCH is based on the time slot level, that is, only one PSCCH / PSSCH can be transmitted in one time slot. It does not support the transmission of multiple PSCCH / PSSCH in one time slot through TDM (Time Division Multiplex and Multiplexer). The PSCCH / PSSCH between different users can be multiplexed in one time slot through FDM (Frequency Division Multiplexing). The time domain resources of PSSCH in NR-V2X are based on the time slot granularity, but unlike the PSSCH in LTE-V2X that occupies all the time domain symbols in a subframe, the PSSCH in NR-V2X can occupy part of the symbols in a time slot. This is mainly because in the LTE system, uplink or downlink transmission is also based on the subframe granularity, so the sidelink transmission is also based on the subframe granularity (the special subframes in the TDD (Time Division Duplex) system are not used for sidelink transmission). The NR system uses a flexible time slot structure, meaning that a time slot includes both uplink and downlink symbols, enabling more flexible scheduling and reducing latency. A typical NR system subframe is shown in Figure 10. A time slot can include downlink symbols (DL), uplink symbols (UL), and flexible symbols. Downlink symbols are located at the beginning of the time slot, while uplink symbols are located at the end of the time slot. Flexible symbols are located between downlink and uplink symbols, and the number of each type of symbol in each time slot is configurable.

[0110] As mentioned above, the sidelink transmission system can share a carrier with the cellular system. In this case, sidelink transmission can only use the cellular system's uplink transmission resources. For NR-V2X, if sidelink transmission still needs to occupy all time-domain symbols in a timeslot, the network must configure a timeslot full of uplink symbols for sidelink transmission. This will significantly impact both uplink and downlink data transmission in the NR system and degrade system performance. Therefore, NR-V2X supports the use of a portion of the time-domain symbols in a timeslot for sidelink transmission, that is, a portion of the uplink symbols in a timeslot are used for sidelink transmission. Furthermore, considering that sidelink transmission includes AGC and GP symbols, if the number of uplink symbols available for sidelink transmission is small, removing AGC and GP symbols leaves even fewer symbols available for transmitting valid data, resulting in low resource utilization. Therefore, in NR-V2X, the minimum number of time-domain symbols occupied by sidelink transmission is seven (including GP symbols). When the sidelink transmission system uses a dedicated carrier, there is no issue of sharing transmission resources with other systems, and all symbols in the timeslot can be configured for sidelink transmission.

[0111] In NR-V2X, the starting point and length of the time domain symbols used for sideline transmission in a time slot are configured through the parameters starting symbol position (sl-StartSymbol) and number of symbols (sl-LengthSymbols). The last symbol in the time domain symbols used for sideline transmission is used as GP, and PSSCH and PSCCH can only use the remaining time domain symbols. However, if PSFCH transmission resources are configured in a time slot, PSSCH and PSCCH cannot occupy the time domain symbols used for PSFCH transmission, as well as the AGC and GP symbols before the symbol.

[0112] As shown in Figure 11, the network configuration starting symbol position = 3, the number of symbols = 11, that is, the 11 time domain symbols starting from symbol index 3 in a time slot can be used for sideline transmission, among which symbol 3 is usually used as an AGC symbol, symbol 13 is used as a GP, and the remaining symbols can be used for PSCCH and PSSCH transmission. PSCCH occupies 2 time domain symbols, but since the data on the AGC symbol is a copy of the data on the second sideline symbol, the first sideline symbol also includes PSCCH data.

[0113] In the NR-V2X system, the time domain resources of the resource pool are also indicated by a bitmap. Considering the flexible time slot structure in the NR system, the length of the bitmap has been extended to support a bitmap length range of [10:160]. The method of using the bitmap to determine the time slot position belonging to the resource pool within an SFN (System Frame Number) period is the same as in LTE-V2X, but with the following two differences:

[0114] The total number of time slots included in one SFN (System Frame Number) period is 10240×2 μ , where the parameter μ is related to the subcarrier spacing;

[0115] If at least one of the time-domain symbols Y, Y+1, Y+2…Y+X-1 included in a time slot is not configured as an uplink symbol by the network's TDD-UL-DL-ConfigCommon signaling, then the time slot cannot be used for sidelink transmission. Y and X represent sl-StartSymbol and sl-LengthSymbols, respectively.

[0116] The specific steps include:

[0117] Step 1: Remove the time slots that do not belong to the resource pool within the SFN cycle, including synchronization time slots and time slots that cannot be used for sideline transmission. The remaining time slots are represented as the remaining time slot set, and the remaining time slots are renumbered as

[0118] in:

[0119] N S_SSB Indicates the number of synchronization time slots in an SFN cycle; the synchronization time slot is determined according to the synchronization-related configuration parameters, and is related to the period of transmitting SSB (Synchronization Signal Block) and the number of SSB transmission resources configured in the period.

[0120] N nonSL Indicates the number of time slots in an SFN cycle that do not comply with the uplink symbol start point and number configuration: If at least one of the time domain symbols Y, Y+1, Y+2…Y+X-1 included in a time slot is not semi-statically configured as an uplink symbol, then the time slot cannot be used for sidelink transmission, where Y and X represent sl-StartSymbol and sl-LengthSymbols, respectively.

[0121] Step 2: Determine the number of reserved time slots and the corresponding time domain positions.

[0122] If the number of time slots in the remaining time slot set cannot be divided by the bitmap length, the number of reserved time slots and the corresponding time domain positions need to be determined. r (0≤r<10240×2 μ -N S_SSB -N nonSL ) satisfies the following conditions, then the time slot is a reserved time slot:

[0123]

[0124] Among them, N reserved =(10240×2 μ -N S_SSB -N nonSL )modL bitmap , represents the number of reserved time slots, L bitmap Indicates the length of the bitmap, m = 0, ..., N reserved -1.

[0125] Step 3: Remove the reserved time slots from the remaining time slot set. The remaining time slot set is represented as a logical time slot set. The time slots in the time slot set are all time slots that can be used in the resource pool. The time slots in the logical time slot set are renumbered as Among them, T max =10240×2 μ -N S_SSB -N nonSL -N reserved .

[0126] Step 4: Determine the time slots in the logical time slot set that belong to the resource pool according to the bitmap.

[0127] The bitmap in the resource pool configuration information is For a time slot in a logical time slot set (0≤k<(10240×2 μ -N S_SSB -N nonSL -N reserved )), when full b k′ =1, the time slot belongs to the resource pool, where k′=k mod L bitmap .

[0128] Step 5: Renumber the time slots belonging to the resource pool determined in step 4 in order i∈{0,1,…,T′ max -1}, where T′ max Indicates the number of time slots included in the resource pool.

[0129] As shown in FIG12 , an SFN cycle (or a DFN (Direct Frame Number) cycle) includes 10240 subframes. The synchronization signal period is 160 ms, and two synchronization subframes are included in one synchronization cycle. Therefore, there are a total of 128 synchronization subframes in one SFN cycle. The length of the bitmap used to indicate the time domain resources of the resource pool is 10 bits, so two reserved subframes are required. The number of remaining subframes is (10240-128-2=10110), which is evenly divisible by the bitmap length of 10. The remaining subframes are renumbered as 0, 1, 2, ..., 10109, with the first three bits of the bitmap being 1 and the remaining seven bits being 0. That is, among the remaining subframes, the first three subframes out of every ten subframes belong to the resource pool, and the remaining subframes do not belong to the resource pool. Since the bitmap needs to be repeated 1011 times in the remaining subframes to indicate whether all subframes belong to the resource pool, and each bitmap period includes 3 subframes, a total of 3033 subframes belong to the resource pool in one SFN period.

[0130] Mode 2 Resource Selection in NR V2X

[0131] Mode 2 resource selection is supported in NR-V2X, that is, the UE excludes resources reserved by other UEs based on the PSCCH sent by other UEs detected, and selects resources for data transmission from the remaining resources.

[0132] The second mode resource selection is performed in two steps:

[0133] Step 1: The UE takes all available resources in the resource selection window as resource set A.

[0134] If the UE sends data in certain time slots within the listening window and does not listen, all resources in the corresponding time slots in the selection window for these time slots are excluded. The UE determines the corresponding time slots in the selection window using the value set of the "resource reservation period" field in the resource pool configuration used.

[0135] If the UE detects the PSCCH within the listening window, it measures the RSRP (Reference Signal Received Power) of the PSCCH or the RSRP of the PSSCH scheduled by the PSCCH. If the measured RSRP is greater than the SL-RSRP threshold, and the reserved resources are determined to be within the resource selection window based on the resource reservation information in the sidelink control information transmitted in the PSCCH, the corresponding resources are excluded from set A. If the remaining resources in resource set A are less than X% of all resources before resource set A is excluded, the SL-RSRP threshold is raised by 3dB and step 1 is repeated. The possible values ​​of X are {20, 35, 50}, and the UE determines the parameter X from this value set based on the priority of the data to be sent. At the same time, the SL-RSRP threshold is related to the priority carried in the PSCCH detected by the UE and the priority of the data to be sent by the UE. The UE uses the remaining resources in set A after resource exclusion as the candidate resource set.

[0136] Step 2: The UE randomly selects several resources from the candidate resource set as the transmission resources for its initial transmission and retransmission.

[0137] Sidelink-based positioning

[0138] 3GPP RAN has conducted studies on “NR Positioning Enhancements” and “Scenarios and Requirements for NR Positioning Use Cases in In-Coverage, Partial Coverage and Out-of-Coverage”. The “Scenarios and Requirements for NR Positioning Use Cases in In-Coverage, Partial Coverage and Out-of-Coverage” studies focus on V2X and public safety use cases. In addition, SA1 (Security Association 1) has developed requirements for “Ranging-based Services” and positioning accuracy requirements for IIoT (Industrial Internet of Things) use cases in out-of-coverage scenarios. 3GPP needs to research and develop sidelink positioning solutions to support the use cases, scenarios and requirements identified in these activities. In order to improve positioning accuracy, especially for UEs located outside of cellular network coverage, 3GPP has introduced positioning based on sidelink positioning reference signals. According to the current conclusions, the sideline positioning reference signal SL PRS can be sent in a dedicated resource pool. However, in order to support sideline positioning and sideline communication, the UE also needs to send and receive UE mutual discovery information, configuration information, measurement reporting information related to sideline positioning, as well as control and data information related to sideline communication, etc., and this information needs to be carried through sideline channels such as PSCCH and / or PSSCH.

[0139] Sidelink transmission in unlicensed spectrum (SL-U)

[0140] When performing sidelink transmission over unlicensed spectrum (SL-U), sidelink transmission must meet specific regulatory requirements, including minimum occupied channel bandwidth (OCB) and maximum power spectral density (PSD). For OCB requirements, the UE must occupy no less than 80% of the channel bandwidth when using the channel for data transmission. For maximum power spectral density requirements, the UE's transmit power per 1MHz cannot exceed 10dBm. To meet OCB and PSD regulatory requirements, sidelink transmission over unlicensed spectrum must adopt an interlaced resource block (IRB) structure. An IRB consists of N discrete RBs in the frequency domain, with a total of M IRBs within the frequency band. The mth IRB consists of RBs in the order {m, M+m, 2M+m, 3M+m, ...}.

[0141] As shown in Figure 13, the system bandwidth includes 20 RBs, including 5 IRBs (i.e., M=5), each IRB includes 4 RBs (i.e., N=4), and the frequency domain intervals of two adjacent RBs belonging to the same IRB are the same, i.e., they are 5 RBs apart. The numbers in the boxes in the figure represent the IRB indexes.

[0142] In the SL-U system, if IRB-based resource allocation granularity is adopted, channels such as the PSCCH and PSSCH in the SL-U system should all be based on the IRB structure. In this case, the frame structure of the SL-U system is shown in Figure 14, where the numbers within the boxes represent the IRB indexes. Figure 14 illustrates a frame structure where only the PSCCH and PSSCH are included in a time slot, excluding the PSFCH. The bandwidth shown in Figure 14 consists of 20 RBs, with five IRB resources configured (i.e., M = 5). Each IRB resource consists of four RBs, and the numbers within the boxes represent the IRB indexes. In Figure 14, the system configures the PSCCH to occupy one IRB resource and two OFDM symbols in the time domain. The PSSCH uses IRB granularity, with the first symbol in the time slot being an AGC symbol and the last symbol being a GP symbol. In Figure 14, PSSCH1 occupies IRB#0 and IRB#1, with its corresponding PSCCH1 occupying IRB#0. PSSCH2 occupies IRB#2, with its corresponding PSCCH2 also occupying IRB#2. It should be noted that, for the sake of simplicity, FIG14 does not show the resources occupied by the second-order SCI and the resources occupied by the PSCCH DMRS and PSSCH DMRS.

[0143] In the unlicensed spectrum, the UE accesses the channel through LBT. As shown in Figure 15, LBT uses a granularity of 20 MHz in the frequency domain. Every 20 MHz is called an RB Set. A carrier can include multiple RB Sets, and there is a guard interval between RB Sets.

[0144] Please refer to Figure 16, which shows a flow chart of a method for sending side control information provided by an embodiment of the present application, which can be applied in a terminal. The method includes the following steps.

[0145] Step 210: Send SL PRS and SCI according to network configuration or pre-configuration, where SCI is used to indicate resource reservation status of SL PRS.

[0146] The terminal receives the network configuration sent by the network device, and sends SL PRS and SCI according to the resource reservation method indicated in the network configuration (allow reservation / allow reservation in reservable time slots / not allow reservation), wherein the resource reservation status of the SL PRS indicated by the SCI is determined according to the resource reservation method indicated by the network configuration.

[0147] Alternatively, the terminal sends SL PRS and SCI according to the resource reservation mode indicated in the preconfiguration (allow reservation / allow reservation in reservable time slots / not allow reservation), wherein the resource reservation status of the SL PRS indicated by the SCI is determined according to the resource reservation mode indicated by the preconfiguration.

[0148] The network device may send a network configuration to the terminal based on the resource overlap between the SL PRS resource pool and the SL-U communication resource pool, or pre-configure the terminal based on the resource overlap between the SL PRS resource pool and the SL-U communication resource pool. For example, different resource overlap situations correspond to different network configurations or pre-configurations.

[0149] The SL PRS resource pool and the SL-U communication resource pool are resource pools on the unlicensed spectrum configured by the network for terminals for sideline communication. The SL PRS resource pool is used for SL PRS transmission, and the SL-U resource pool is used for SL-U communication.

[0150] The SL PRS resource pool / SL-U resource pool includes at least one time slot in the time domain. The at least one time slot can be continuous, distributed, or periodically repeated. The SL PRS resource pool / SL-U resource pool includes at least one subchannel in the frequency domain. The at least one subchannel is continuous. Optionally, the at least one subchannel can also be distributed or periodically repeated.

[0151] A subchannel includes at least one continuous PRB. Optionally, a subchannel includes 10, 12, 15, 20, 50, 75, or 100 PRBs.

[0152] The configuration information of the resource pool (SL PRS resource pool / SL-U resource pool) includes at least one of the following parameters: subchannel size (sl-SubchannelSize): indicates the number of consecutive PRBs included in a subchannel in the resource pool, with a value range of {10, 12, 15, 20, 50, 75, 100} PRBs; number of subchannels (sl-NumSubchannel): indicates the number of subchannels included in the resource pool; subchannel starting RB index (sl-StartRB-Subchannel): indicates the starting PRB index of the first subchannel in the resource pool; number of PRBs (sl-RB-Number): indicates the number of consecutive PRBs included in the resource pool.

[0153] The resource overlap between the SL PRS resource pool and the SL-U communication resource pool includes but is not limited to:

[0154] Case (1): The SL PRS resource pool completely overlaps with the SL-U communication resource pool; for example, as shown in FIG17 , the SL PRS resource pool and the SL-U communication resource pool are identical in both the time domain and the frequency domain.

[0155] Case (2): There are resources overlapping with the SL-U communication resource pool in each time slot in the SL PRS resource pool; for example, as shown in Figure 18, the SL PRS resource pool and the SL-U communication resource pool are the same in the time domain and overlap in the frequency domain.

[0156] Case (3): Some time slots of the SL PRS resource pool belong to the SL-U communication resource pool, and other time slots of the SL PRS resource pool do not belong to the SL-U communication resource pool, that is, the SL PRS resource pool includes time slots that do not belong to the SL-U communication resource pool; for example, as shown in Figure 19, the SL PRS resource pool and the SL-U communication resource pool have non-overlapping parts in the time domain, and there is frequency domain overlap in the time domain of the overlapping parts.

[0157] Case (4): The SL PRS resource pool and the SL-U communication resource pool do not overlap at all. For example, as shown in FIG20 , the SL PRS resource pool and the SL-U communication resource pool do not overlap in both the time domain and the frequency domain.

[0158] If SL PRS transmission and SL-U communication are carried out simultaneously in the same time slot, transmission conflict may occur, resulting in the receiver being unable to receive the information accurately. Therefore, based on the time domain overlap between the SL PRS resource pool and the SL-U communication resource pool, consider whether the terminal sending SL PRS can reserve resources in the SL PRS resource pool for SL PRS transmission.

[0159] If the SL PRS resource pool and the SL-U communication resource pool completely overlap in the time domain, the network configuration or pre-configuration can indicate that the terminal sending the SL PRS cannot reserve resources in the SL PRS resource pool for SL PRS sending, or the terminal sending the SL PRS needs to send an SCI that can be recognized by all terminals to indicate the resources reserved for SL PRS sending.

[0160] If there are time slots in the SL PRS resource pool that do not overlap with the SL-U communication resource pool, the network configuration or pre-configuration may indicate that the terminal sending the SL PRS may reserve resources on the non-overlapping time slots for SL PRS transmission.

[0161] Optionally, the SL-U communication resource pool can be a resource pool for SL-U communication configured by the network for the backward UE. The backward UE is a UE that supports sending side data on the unlicensed spectrum but cannot recognize SCI-P (SCI for Positioning, positioning side control information). For example, the SCI-P and SCI-C (SCI for Communication, communication control information) have different formats or different sending methods, and the backward UE cannot decode SCI-P. SCI-P is used to indicate SL PRS sending resources and / or SL PRS reserved resources. For example, the backward UE is a UE that only supports 3GPP R18 version SL-U. The backward UE can recognize SCI-C.

[0162] When the backward UE cannot identify the SCI-P sent by the UE that sends the SL PRS, the backward UE cannot know the resources reserved by the UE that sends the SL PRS, and the backward UE may use the resources reserved by the UE that sends the SL PRS for SL-U communication. At this time, a transmission conflict between the SL-U communication and the SL PRS transmission will occur. Therefore, the method provided in the embodiment of the present application requires the UE that sends the SL PRS to determine the resource reservation status of the SL PRS based on the resource overlap between the SL PRS resource pool and the SL-U communication resource pool, so as to avoid transmission conflicts with the backward UE.

[0163] The terminal executing this method is a terminal sending an SL PRS, which sends an SL PRS and an SCI in one time slot. The SCI may be referred to as an SCI-P. The SCI is used to indicate the resources for this SL PRS transmission. Optionally, the SCI is also used to indicate the reserved resources for SL PRS transmission.

[0164] The SCI is used to indicate the resource reservation status of the SL PRS. When the SCI includes relevant indication information of reserved resources, the SCI is used to indicate the reserved resources sent by the SL PRS; when the SCI does not include relevant indication information of reserved resources, the SCI is used to indicate that no resources are reserved for the SL PRS.

[0165] Optionally, the formats of the SCI (SCI-P) used to indicate SL PRS transmission resources and / or SL PRS reserved resources and the SCI (SCI-C) used by the backward UE to indicate PSSCH transmission resources and PSSCH reserved resources may be different or the same, and the SCI-P includes one or more of the following information:

[0166] – SL PRS ID (Identity) information;

[0167] –The time-frequency resource location occupied by SL PRS;

[0168] – The number of repetitions of the SL PRS and the time-frequency resource locations used for repeated transmission;

[0169] –SL PRS sending period;

[0170] –SL PRS sends relevant information of UE, such as geographical location, type, etc.

[0171] Optionally, the UE occupies at least one RB set when sending SL PRS.

[0172] Optionally, the SL PRS sent by the UE may be used for absolute positioning, or for relative positioning, that is, for the UE receiving the PRS to determine the distance and / or direction relative to the sending UE.

[0173] Optionally, the SL-U communication resource pool may also be called a sideline communication resource pool, a Mode 2 sideline communication resource pool, etc.

[0174] In summary, the method provided in this embodiment, since some terminals (backward terminals) cannot recognize the SCI (Sidelink Control Information) (or SCI-P (SCI for Positioning)) used to indicate the SL PRS resource reservation status, if the terminal sends SCI-P to reserve part of the resources for SL PRS, the backward terminal cannot know that this part of the resources has been occupied, and the backward terminal may still select this part of the resources for SL-U communication, resulting in a transmission conflict between SL-U communication and SL PRS. In order to avoid the transmission conflict between SL-U communication and SL PRS, the terminal sending SL PRS can determine the resource reservation status of SL PRS according to the network configuration or pre-configuration; wherein the network configuration or pre-configuration is determined by the network equipment based on the reservation status of the SL PRS resource pool and the SL-U communication resource pool. If there is resource overlap between the SL PRS resource pool and the SL-U communication resource pool, the overlapping resources do not need to be reserved for SL PRS; if there are non-overlapping resources between the SL PRS resource pool and the SL-U communication resource pool, the non-overlapping resources can be reserved for SL PRS, thereby reducing the mutual interference between SL PRS and SL-U data and improving the positioning accuracy of the SL PRS system.

[0175] Exemplarily, in view of the different resource overlaps between the SL PRS resource pool and the SL-U communication resource pool, the following three exemplary embodiments are provided to reduce the conflict between the SL PRS transmission resources and the SL-U transmission resources:

[0176] 1. The UE sending the SL PRS does not reserve resources in other time slots that overlap with the SL-U communication resource pool used by the backward UE for SL PRS transmission.

[0177] 2. The UE sending the SL PRS may reserve time slots in the SL-U communication resource pool that are not used by backward UEs for SL PRS transmission.

[0178] 3. The UE sending SL PRS can reserve resources in other time slots that overlap with the SL-U communication resource pool used by the backward SL-U UE for SL PRS transmission, and indicate the reserved resources through the SCI that can be recognized by the backward UE.

[0179] Of course, based on the method provided in the embodiments of the present application, more exemplary embodiments can be obtained, and are not limited to the above three exemplary embodiments.

[0180] These three exemplary embodiments are described below respectively.

[0181] 1. The UE sending the SL PRS does not reserve resources in other time slots that overlap with the SL-U communication resource pool used by the backward UE for SL PRS transmission.

[0182] Please refer to Figure 21, which shows a flow chart of a method for sending side control information provided by an embodiment of the present application, which can be applied in a terminal. The method includes the following steps.

[0183] Step 211: When the network configuration or pre-configuration indicates that reserved resources are not allowed in the SL PRS resource pool, the SL PRS and SCI are sent, and the SCI is not used to indicate the reserved resources of the SL PRS.

[0184] Alternatively, when the network configuration or pre-configuration does not indicate a reservable time slot, the SCI is not used to indicate the reserved resources of the SL PRS. Optionally, the reservable time slot belongs to the SL PRS resource pool and does not belong to the SL-U communication resource pool.

[0185] Optionally, when each time slot in the SL PRS resource pool has resources that overlap with the SL-U communication resource pool, the network configuration or pre-configuration indicates that reserved resources are not allowed in the SL PRS resource pool.

[0186] Optionally, the terminal sends SCI and SL PRS in the same time slot, and SCI is used to indicate the resources of the SL PRS sent this time, and SCI is not used to indicate the reserved resources of SL PRS. For example, the terminal sends PSCCH and SL PRS in the same time slot, and PSCCH carries SCI. Alternatively, SCI includes first-order SCI and second-order SCI, and the terminal sends PSCCH, PSSCH and SL PRS in the same time slot, PSCCH carries first-order SCI, and PSSCH carries second-order SCI.

[0187] Optionally, the resources used by the terminal to send the SCI and SL PRS this time are the transmission resources occupied by the terminal after the LBT is successful. Alternatively, the resources used by the terminal to send the SCI and SL PRS this time are the resources previously reserved by the terminal.

[0188] In this embodiment, the SL PRS resource pool and the SL-U communication resource pool completely overlap in the time domain and partially overlap, completely overlap, or do not overlap in the frequency domain. For example, as shown in FIG18 , the SL PRS resource pool and the SL-U communication resource pool contain the same time slots.

[0189] In this embodiment, the SCI sent by the terminal is SCI-P, and the format of SCI-P is different from that of SCI-C, and / or the transmission mode of SCI-P is different from that of SCI-C. SCI-P includes at least one of the following information: ID information of SL PRS; the time-frequency resource location occupied by SL PRS; the number of repetitions of SL PRS and the time-frequency resource location used for repeated transmission; the transmission period of SL PRS; and relevant information of the terminal sending SL PRS.

[0190] In this embodiment, the formats / transmission modes of SCI-P and SCI-C are different, and the backward UE cannot decode the SCI (SCI-P) indicating that the SL PRS is sent. For example, the formats of SCI-P and SCI-C are different, or the PSCCH transmission modes used to carry SCI-P and used to carry SCI-C are different.

[0191] Since the backward UE cannot identify SCI-P, the UE sending SL PRS cannot send SCI-P in time slot A to reserve resources in time slot B for SL PRS transmission, where A≠B. For example, when each time slot in the SL PRS resource pool has resources that overlap with the SL-U communication resource pool used by the backward UE, any resources reserved for SL PRS transmission by the UE sending SL PRS may conflict with the resources used by the backward UE. In order to reduce the occurrence of resource conflicts between the two, in the SL PRS resource pool, the UE sending SL PRS is only allowed to determine the resources for SL PRS transmission in a time slot through Mode 2 resource selection, and cannot reserve resources in another time slot for SL PRS transmission through SCI-P sent in a time slot. As shown in Figure 18, the SL PRS resource pool and the sideline communication resource pool used by the backward UE contain the same time slots. The UE sending SL PRS cannot send indication information in any time slot in the resource pool to reserve resources in other time slots in the resource pool for SL PRS transmission.

[0192] To sum up, in the method provided in this embodiment, since the backward UE cannot recognize SCI-P, when the time slots in the SL PRS resource pool and the SL-U communication resource pool completely overlap, the terminal sending SL PRS will not reserve resources for SL PRS and can only determine the resources of SL PRS through LBT, thereby avoiding conflicts between SL PRS sending resources and SL-U communication resources, reducing mutual interference between SL PRS and SL-U data, and improving the positioning accuracy of the SL PRS system.

[0193] 2. The UE sending the SL PRS may reserve time slots in the SL-U communication resource pool that are not used by backward UEs for SL PRS transmission.

[0194] Please refer to Figure 22, which shows a flow chart of a method for sending side control information provided by an embodiment of the present application, which can be applied in a terminal. The method includes the following steps.

[0195] Step 212: When the network configuration or pre-configuration indicates a reservable time slot, SL PRS and SCI are sent. SCI is used to indicate the reserved resources of SL PRS. The reserved resources are transmission resources in the reservable time slot.

[0196] Optionally, the reservable time slot belongs to the SL PRS resource pool and does not belong to the SL-U communication resource pool.

[0197] Optionally, the terminal sends SCI and SL PRS in the same time slot, and SCI is used to indicate the resources of the SL PRS sent this time and the reserved resources of the SL PRS. For example, the terminal sends PSCCH and SL PRS in the same time slot, and the PSCCH carries SCI. Alternatively, SCI includes first-order SCI and second-order SCI, and the terminal sends PSCCH, PSSCH and SL PRS in the same time slot, the PSCCH carries first-order SCI, and the PSSCH carries second-order SCI.

[0198] Optionally, the resources used by the terminal to send the SCI and SL PRS this time are the transmission resources occupied by the terminal after the LBT is successful. Alternatively, the resources used by the terminal to send the SCI and SL PRS this time are the resources previously reserved by the terminal.

[0199] In this embodiment, the SL PRS resource pool and the SL-U communication resource pool do not overlap or completely overlap in the time domain (there are time slots in the SL PRS resource pool that do not belong to the SL-U communication resource pool), and partially overlap, completely overlap, or do not overlap in the frequency domain. For example, as shown in Figure 19, the SL PRS resource pool contains time slots 3, 4, 13, and 14 that do not belong to the SL-U communication resource pool. Time slots 3, 4, 13, and 14 are reservable time slots, and the terminal can indicate the resources in the reservable time slots as reserved resources for the SL PRS in the SCI.

[0200] In this embodiment, the SCI sent by the terminal is SCI-P, and the format of SCI-P is different from that of SCI-C, and / or the transmission mode of SCI-P is different from that of SCI-C. SCI-P includes at least one of the following information: ID information of SL PRS; the time-frequency resource location occupied by SL PRS; the number of repetitions of SL PRS and the time-frequency resource location used for repeated transmission; the transmission period of SL PRS; and relevant information of the terminal sending SL PRS.

[0201] In this embodiment, the backward UE cannot decode the SCI (SCI-P) indicating the SL PRS transmission, for example, the SCI-P and SCI-C formats are different, or the PSCCH transmission methods used to carry SCI-P and used to carry SCI-C are different.

[0202] The UE can send indication information in time slot A to reserve resources in time slot B for SL PRS transmission, but time slot B should belong to a specific time slot range (referred to as reservable time slot). Optionally, the reservable time slot does not belong to the SL-U communication resource pool used by the backward UE. For example, when some time slots of the SL PRS resource pool belong to the sideline communication resource pool used by the backward UE, and other time slots do not belong to the Mode 2 sideline communication resource pool (SL-U communication resource pool) used by the backward UE, the UE sending the SL PRS can reserve resources in this part of the time slots for SL PRS transmission. As shown in Figure 23, time slot #2, time slot #12...are included in the SL PRS resource pool but do not belong to the Mode 2 sideline communication resource pool (SL-U communication resource pool) used by the backward UE, and can be used as reservable time slots. The UE sending the SL PRS can reserve resources in this part of the time slots for sending the SL PRS through indication information sent in other time slots. Since the backward UE will not send sidelink data in the reservable time slot, the resources reserved by the SL PRS will not conflict with the resources of the backward UE.

[0203] For example, as shown in FIG19 , the reservable time slots include time slot 3, time slot 4, time slot 13, and time slot 14. When the terminal sends SCI and SL PRS in time slot 2, the SCI may indicate that the transmission resources in time slot 13 are reserved for SL PRS transmission.

[0204] Optionally, the reservable time slots are indicated by resource pool configuration or pre-configuration signaling. For example, the reserved time slots in the resource pool configuration are used as reservable time slots. Alternatively, the reserved time slots indicated in the pre-configuration signaling are used as reservable time slots. The resource pool configuration includes configuration information of the SL PRS resource pool and configuration information of the SL-U communication resource pool.

[0205] Specifically, the UE that sends the SL PRS can determine the reservable time slots through the configuration of the resource pool or pre-configuration signaling. For example, the reservable time slots can be indicated by the configuration of the resource pool or a specific information field (such as a specific bit map) in the pre-configuration signaling; or, the UE that sends the SL PRS can determine the reservable time slots through specific rules. For example, if the SL PRS resource pool contains time slots for S-SSB transmission, or contains reserved time slots (reserved slots) in the process of determining the SL-U communication resource pool, then this part of the time slots can be used as reservable time slots. Among them, the S-SSB time slot is the time slot for S-SSB transmission configured on the current SL BWP (Bandwidth Part), and the UE can only send SL PRS using the frequency domain resources in the time slot that are not used for S-SSB transmission.

[0206] It should be noted that Example 1 can be regarded as a special case of Example 2, that is, when the UE sending SL PRS determines that there are reservable time slots in the SL PRS resource pool, the resources in the reservable time slots can be reserved for SL PRS sending (that is, Example 2); otherwise, resources in different time slots cannot be reserved for SL PRS sending (that is, Example 1).

[0207] Optionally, for any UE sending SL PRS, it can determine whether resources in a reservable time slot are reserved by other UEs by detecting indication information sent by other UEs, thereby determining whether resources in the time slot can be selected or reserved for sending SL PRS.

[0208] To sum up, the method provided in this embodiment is that since the backward UE cannot recognize SCI-P, when there are some time slots in the SL PRS resource pool that do not overlap with the SL-U communication resource pool, the terminal sending SL PRS can reserve the resources on this non-overlapping time slot for SL PRS transmission, thereby avoiding the conflict between SL PRS transmission resources and SL-U communication resources, reducing the mutual interference between SL PRS and SL-U data, and improving the positioning accuracy of the SL PRS system.

[0209] 3. The UE sending SL PRS can reserve resources in other time slots that overlap with the SL-U communication resource pool used by the backward SL-U UE for SL PRS transmission, and indicate the reserved resources through the SCI that can be recognized by the backward UE.

[0210] Please refer to Figure 24, which shows a flow chart of a method for sending side control information provided by an embodiment of the present application, which can be applied in a terminal. The method includes the following steps.

[0211] Step 213: When the network configuration or pre-configuration indicates that reserved resources are allowed in the SL PRS resource pool, the SL PRS and SCI are sent, where the SCI is used to indicate the reserved resources of the SL PRS.

[0212] Optionally, the network configuration or pre-configuration indicates that resources can be reserved in the SL PRS resource pool, and the format and transmission method of SCI-P are the same as those of SCI-C. In this way, the terminal can reserve resources in the SL PRS resource pool and indicate the reserved resources through SCI-P. The UE can then parse the SCI-P to know that these resources have been reserved.

[0213] Optionally, there is resource overlap between the SL PRS resource pool and the SL-U communication resource pool in the time slot where the reserved resources are located.

[0214] Optionally, the UE determines whether there is overlap with the resources of the SL-U communication resource pool based on the configuration information of the SL PRS resource pool. The UE can reserve resources in other time slots that overlap with the SL-U communication resource pool used by the backward UE for SL PRS transmission, and indicate the reserved resources through an SCI that can be identified by the backward UE. Alternatively, the UE reserves resources in other time slots in the SL PRS resource pool for SL PRS transmission based on network configuration or pre-configuration, and indicates the reserved resources through an SCI that can be identified by the backward UE.

[0215] In this embodiment, the time slots occupied by the SL PRS resource pool and the SL-U communication resource pool used by the backward UE overlap, and the frequency domain resources occupied in each time slot can be the same or different. If the UE sending the SL PRS sends the SL PRS in time slot A and reserves one or more subsequent overlapping time slots for SL PRS transmission, the UE should send a PSCCH in time slot A to indicate the above reservation information.

[0216] In this embodiment, the SCI sent by the terminal is SCI-P. The format of SCI-P is the same as that of SCI-C, and the transmission method of SCI-P and SCI-C is the same. The format of SCI-P is the same as that of SCI-C, and the transmission method of the PSCCH carrying SCI-P and carrying SCI-C is the same. SCI-P includes at least one of the following information: SL PRS ID information; the time-frequency resource location occupied by SL PRS; the number of repetitions of SL PRS and the time-frequency resource location used for repeated transmission; the transmission period of SL PRS; and relevant information of the SL PRS transmitting terminal.

[0217] The UE always transmits the SL PRS and the PSCCH and / or PSSCH indicating SL PRS transmission in the same time slot.

[0218] Specifically, if the PSCCH in the SL PRS resource pool is sent using continuous RBs, the PSCCH carrying SCI is sent using continuous RBs. That is, if the PSCCH in the resource pool is sent using continuous RBs, the PSCCH used to carry SCI-P and the PSCCH used to carry SCI-C are both sent using continuous RBs.

[0219] When the PSCCH in the SL PRS resource pool is sent using a continuous IRB structure, the PSCCH carrying SCI is sent using an IRB structure. That is, if the PSCCH in the resource pool is sent using an IRB structure, both the PSCCH carrying SCI-P and the PSCCH carrying SCI-C are sent using an IRB structure.

[0220] In this embodiment, the time slots occupied by the SL PRS resource pool and the SL-U communication resource pool used by the backward UE are partially overlapped or completely overlapped. If the terminal sending the SL PRS wants to reserve the transmission resources in the overlapping time slots for SL PRS sending, it is necessary to send an SCI that can be parsed by the backward UE to indicate the reserved resources.

[0221] Optionally, there are multiple ways to send SCI, which can be carried on PSCCH or carried on PSCCH and PSSCH. The ways to send SCI include at least:

[0222] In mode 1, the terminal can send PSCCH in the time slot of sending SL PRS, and PSCCH carries SCI.

[0223] Mode 1.1: SL PRS is not transmitted in the symbol where PSCCH is located, and PSCCH is transmitted in the first subchannel used for SL PRS transmission.

[0224] Mode 1.2: SL PRS is not transmitted on the symbol where PSCCH is located. Multiple groups of resources for transmitting PSCCH and SL PRS are set in one time slot, and different SL PRS resources are used to correspond to different PSCCH resources.

[0225] Mode 1.3: SL PRS can be sent in the symbol where PSCCH is located.

[0226] In mode 2, the terminal can send PSCCH and PSSCH in the time slot of sending SL PRS. PSCCH carries the first-order SCI and PSSCH carries the second-order SCI.

[0227] Mode 2.1: SL PRS is not transmitted on the symbol where PSCCH is located. PSCCH is transmitted in the first subchannel used for SL PRS transmission, and the remaining IRBs on the symbol where PSCCH is located are used to transmit PSSCH.

[0228] Mode 2.2: SL PRS is not transmitted on the symbol where PSCCH is located. Multiple groups of resources for transmitting PSCCH, PSSCH and SL PRS are set in one time slot. Different SL PRS resources are used to correspond to different PSCCH / PSSCH resources.

[0229] Mode 2.3: SL PRS can be sent in the symbol where PSCCH is located.

[0230] The above methods are described below respectively.

[0231] In mode 1, the terminal can send PSCCH in the time slot of sending SL PRS, and PSCCH carries SCI.

[0232] Please refer to Figure 25, step 213 may include step 214.

[0233] Step 214: When the network configuration or pre-configuration indicates that reserved resources are allowed in the SL PRS resource pool, the SL PRS and PSCCH are sent in the first time slot. The PSCCH carries the SCI, and the SCI is used to indicate the reserved resources of the SL PRS.

[0234] Optionally, there is time-frequency overlap between the SL PRS resource pool and the SL-U communication resource pool in the time slot where the reserved resources are located.

[0235] That is, PSCCH is sent in the time slot in which SL PRS is sent. A UE sending SL PRS only sends PSCCH in the time slot in which SL PRS is sent, and does not send PSSCH in the same time slot. The UE only indicates SL PRS transmission and / or reserves SL PRS transmission resources through SCI-P carried by PSCCH.

[0236] Specifically, the time-frequency resources for sending the PSCCH may be:

[0237] Mode 1.1: SL PRS is not transmitted in the symbol where PSCCH is located, and PSCCH is transmitted in the first subchannel used for SL PRS transmission.

[0238] The time-frequency resources of PSCCH include: the OFDM symbols used for PSCCH transmission in the first time slot, and part or all of the IRBs / RBs in the first subchannel used for SL PRS transmission. The OFDM symbols used for PSCCH transmission can be determined according to network configuration or established rules.

[0239] The time-frequency resources of SL PRS include: part or all of the IRBs / RBs in the subchannel used for SL PRS transmission on the OFDM symbols other than the OFDM symbols used for PSCCH transmission in the first time slot.

[0240] SL PRS is not sent on the OFDM symbol where PSCCH is located. The UE occupies one or all IRBs in the first subchannel used for SL PRS transmission to send PSCCH on the OFDM symbol used for PSCCH transmission in the time slot.

[0241] For example, as shown in (1) in Figure 26, it is a time-frequency resource diagram for SL PRS transmission in the first time slot. The first time slot includes 14 symbols, and the frequency domain resources for SL PRS transmission include four sub-channels. Among them, symbol 3, symbol 4, and symbol 5 are OFDM symbols for PSCCH transmission. Based on the time-frequency resource diagram shown in Figure 26 (1), as shown in (2) in Figure 26, the time-frequency resources used to send PSCCH in method 1.1 are part or all of the IRB / RB in the first sub-channel on symbols 3, 4, and 5; the time-frequency resources used to send SL PRS are part or all of the IRB / RB in the four sub-channels on symbols 6-13.

[0242] When the SL PRS is sent in the first time slot, the frequency domain resources used for SL PRS transmission include part or all of the PRBs in the SL PRS resource pool. That is, if the UE sends the SL PRS in one time slot, the UE occupies all or part of the PRBs in the resource pool.

[0243] Mode 1.2: SL PRS is not transmitted on the symbol where PSCCH is located. Multiple groups of resources for transmitting PSCCH and SL PRS are set in one time slot, and different SL PRS resources are used to correspond to different PSCCH resources.

[0244] The first time slot includes multiple groups of time-frequency resources for PSCCH, and a group of time-frequency resources for PSCCH includes: part or all of the IRBs on the OFDM symbols used for PSCCH transmission; the time-frequency resources of SL PRS adopt a comb-tooth structure; the first time slot includes one or more time-frequency resources for SL PRS, and a time-frequency resource of SL PRS includes: a group of comb-tooth structure resources on part or all of the OFDM symbols in the first time slot except those used for PSCCH transmission; a group of time-frequency resources for PSCCH corresponds one-to-one to a time-frequency resource of SL PRS.

[0245] The SL PRS uses a comb-tooth structure. Different RE (Resource Element) offsets on the first OFDM symbol used for SL PRS transmission in a time slot correspond to different SL PRS resources. An example is shown in Figure 27, where the comb-tooth size is 2, and the SL PRS resources are sorted from low to high by RE offset. As shown in Figure 27, a group of SL PRS resources with RE offset = 0 is SL PRS resource #0, and a group of SL PRS resources with RE offset = 1 is SL PRS resource #1.

[0246] Optionally, the tooth size of the SL PRS comb structure is the number of time-frequency resources / groups of the SL PRS. If the tooth size of the SL PRS comb structure is x, then the SL PRS resources include x groups, where x is a positive integer. Optionally, the number of PSCCH resource groups is the same as the number of SL PRS resource groups, so that one group of SL PRS resources corresponds to one group of PSCCH resources.

[0247] For example, in the first time slot, the SL PRS resource pool includes a subchannels in the frequency domain, and the resources used to send PSCCH in each subchannel are a group of PSCCH resources. There are a total of a groups of PSCCH resources, and the a groups of PSCCH resources are sorted from low to high in the frequency domain, and a is a positive number. In the first time slot, the SL PRS resources are in a comb-tooth structure, and the comb-tooth size is a. Then there are a total of a groups of SL PRS resources, and the a groups of SL PRS resources are sorted from low to high according to the RE offset. Then the i-th group of PSCCH resources corresponds to the i-th group of SL PRS resources. When the i-th group of SL PRS resources is used to send SL PRS, the i-th group of PSCCH resources is used to send PSCCH, and i is an integer not greater than a.

[0248] That is, in this method, a group of PSCCH resources is one or more IRBs within a subchannel; multiple time-frequency resources of SL PRS are sorted according to the resource element RE offset of the comb structure; when the i-th time-frequency resource of SL PRS is used to send SL PRS, the time-frequency resources for sending PSCCH are: part or all of the IRBs used for PSCCH transmission in the i-th subchannel in the SL PRS resource pool, where i is an integer.

[0249] Optionally, the frequency domain resources indicated by the SCI in the PSCCH are from the i-th subchannel to the last subchannel occupied by the SL PRS. That is, the frequency domain resources for sending the SL PRS are: the i-th group of SL PRS resources in the SL PRS resource pool from the i-th subchannel to the last subchannel in the SL PRS resource pool; the time domain resources are: the symbols in the first time slot that are not used to send the PSCCH.

[0250] That is, the time-frequency resources for sending SL PRS are: the i-th time-frequency resource of SL PRS in the frequency domain starting from the i-th subchannel to the last subchannel in the SL PRS resource pool on the OFDM symbol after the OFDM symbol used to send PSCCH in the first time slot.

[0251] For example, as shown in (1) in Figure 28, this is the time-frequency resource diagram for SL PRS transmission in the first time slot. The first time slot includes 14 symbols, and the frequency domain resources for SL PRS transmission include two subchannels, one subchannel includes ten RBs, and one RB includes 12 REs. SL PRS has a comb-tooth structure with a comb-tooth size of 2. An RE offset of 0 corresponds to SL PRS resource 0, and an RE offset of 1 corresponds to SL PRS resource 1. Symbol 3, symbol 4, and symbol 5 are OFDM symbols for PSCCH transmission. The resource for sending PSCCH in the first subchannel is PSCCH resource 0, and the resource for sending PSCCH in the second subchannel is PSCCH resource 1. Based on the time-frequency resource diagram shown in Figure 28 (1), SL PRS resource 0 corresponds to PSCCH resource 0, and SL PRS resource 1 corresponds to PSCCH resource 1. As shown in (2) in Figure 28, if SL PRS resource 1 is used to send SL PRS in method 1.2, the time-frequency resources used to send PSCCH are PSCCH resource 1 in the second sub-channel on symbols 3, 4, and 5; the time-frequency resources used to send SL PRS are SL PRS resource 1 corresponding to the RE offset of 1 in the second sub-channel on symbols 6-13.

[0252] Alternatively, in the first time slot, there are b symbols used to send PSCCH, and the resources used to send PSCCH in the symbol are defined as a group of PSCCH resources. There are b groups of PSCCH resources in total, and the b groups of PSCCH resources are sorted from low to high according to the time domain, where b is a positive number. In the first time slot, the SL PRS resources have a comb-tooth structure with a comb-tooth size of b, and there are b groups of SL PRS resources in total, and the b groups of SL PRS resources are sorted from low to high according to RE offset. Then the i-th group of PSCCH resources corresponds to the i-th group of SL PRS resources. When the i-th group of SL PRS resources is used to send SL PRS, the i-th group of PSCCH resources is used to send PSCCH, where i is an integer not greater than b.

[0253] This approach can support multiple UEs sending SL PRS in the same time slot through frequency division multiplexing.

[0254] Mode 1.3: SL PRS can be sent in the symbol where PSCCH is located.

[0255] The time-frequency resources of PSCCH include: part or all of the IRB / RB in the first subchannel used for SL PRS transmission on the OFDM symbol used for PSCCH transmission in the first time slot; the time-frequency resources of SL PRS include: the first part of resources and the second part of resources; among which, the first part of resources includes: part or all of the IRB / RB in the OFDM symbol used for PSCCH transmission in the first time slot that is not used for sending PSCCH; the second part of resources includes: part or all of the IRB / RB in the subchannel used for SL PRS transmission on the OFDM symbol other than that used for PSCCH in the first time slot.

[0256] Optionally, the second part of resources includes part or all of the IRB / RB in the subchannel used for SL PRS transmission on the OFDM symbol following the OFDM symbol used for PSCCH transmission in the first time slot.

[0257] For example, the terminal can send SL PRS on the OFDM symbol where the PSCCH is located, but the receiving UE is not required to process the SL PRS sent on these OFDM symbols. If the terminal capability of the receiving UE is strong enough, the receiving UE can process the SL PRS on these OFDM symbols. If the terminal capability of the receiving UE is weak, the SL PRS on these OFDM symbols may not be processed.

[0258] Optionally, when determining the RE offset of SL PRS on different OFDM symbols, the OFDM symbols used to send PSCCH are not considered. That is, the RE offset of the SL PRS comb structure is calculated according to the RE offset on the OFDM symbols in the second part of the resources, and the RE offset on the OFDM symbols in the first part of the resources is not considered.

[0259] In this method, the PSCCH carrying the SCI-P is sent in part or all of the IRBs of the first subchannel occupied by the SL PRS. Within the OFDM symbols of the PSCCH, the UE can send the SL PRS on other IRBs except for those used to send the PSCCH. Assume that OFDM symbols 0, 1, ..., C-1 in the time slot are OFDM symbols containing the PSCCH, and symbol C is the OFDM symbol used for SL PRS transmission.

[0260] For example, as shown in (1) in Figure 29, it is a time-frequency resource diagram for SL PRS transmission in the first time slot. The first time slot includes 14 symbols, and the frequency domain resources for SL PRS transmission include four sub-channels. Among them, symbol 3, symbol 4, and symbol 5 are OFDM symbols for PSCCH transmission. Based on the time-frequency resource diagram shown in Figure 29 (1), as shown in (2) in Figure 29, the time-frequency resources used to send PSCCH in method 1.3 are part or all of the IRB / RB in the first sub-channel on symbols 3, 4, and 5; the time-frequency resources used to send SL PRS are part or all of the IRB / RB in the four sub-channels on symbols 3-13 that are not used to send PSCCH.

[0261] Exemplarily, the SL PRS sequence sent on the first part of resources and the RE position for sending the SL PRS may be determined in at least the following ways:

[0262] (1) The SL PRS sequence sent on the first part of resources is the same as the DMRS sequence of the PSCCH; the REs occupied by the SL PRS sent on the first part of resources on the RB are the same as the RE positions occupied by the DMRS of the PSCCH on the RB.

[0263] The sequence of the SL PRS sent by the UE on the OFDM symbol where the PSCCH is located is a repetition of the DMRS of the PSCCH in the frequency domain. The REs occupied on each PRB are the same as the REs occupied by the DMRS on the RB occupied by the PSCCH.

[0264] For example, if the DMRS sequence of the PSCCH is 010101, the sequence of the SL PRS sent on the first part of resources is also 010101. If the DMRS of the PSCCH is sent on RE#2 of the RB, the SL PRS sent on the first part of resources is also sent on RE#2 of the RB.

[0265] (2) The SL PRS sequence sent on the first part of resources is the subsequent part of the DMRS sequence of the PSCCH; the REs occupied by the SL PRS sent on the first part of resources on the RB are the same as the RE positions occupied by the DMRS of the PSCCH on the RB.

[0266] The SL PRS sequence sent by the UE on the OFDM symbol where the PSCCH is located is the DMRS sequence of the PSCCH, and the REs occupied on each PRB are the same as the REs occupied by the DMRS on the RB occupied by the PSCCH.

[0267] The DMRS sequence is derived from the preliminary sequence, which is an infinite sequence. For example, the preliminary sequence is 0101, 0100, 0111, 0000, 1111... The first segment of the PSCCH DMRS sequence is 0101. Then, the SL PRS sent on the first part of the resources can sequentially truncate the subsequent sequences: 0100, 0111, 0000, 1111. For example, the SL PRS sequence sent on the first symbol is 0100, the SL PRS sequence sent on the second symbol is 0111, the SL PRS sequence sent on the third symbol is 0000, and the SL PRS sequence sent on the fourth symbol is 1111.

[0268] (3) The SL PRS sequence sent on the first part of the resources is the same as the SL PRS sequence sent on the first symbol of the second part of the resources; the RE occupied by the SL PRS sent on the first part of the resources on the RB is the same as the RE position occupied by the SL PRS sent on the first symbol of the second part of the resources on the RB.

[0269] Optionally, the first symbol of the second part of the resources is the Cth symbol in the first time slot. The SL PRS sequence sent by the UE on the OFDM symbol where the PSCCH is located is the SL PRS sequence sent on the Cth OFDM symbol, and the RE position occupied on each RB is the same as the RE occupied by the SL PRS on the Cth OFDM symbol.

[0270] For example, if the SL PRS sequence sent on the Cth OFDM symbol is 010101, then the SL PRS sequence sent on the first part of resources is also 010101. If the SL PRS on the Cth OFDM symbol is sent on RE#2 of the RB, then the SL PRS sent on the first part of resources is also sent on RE#2 of the RB.

[0271] (4) The SL PRS sequence sent on the j-th symbol of the first part of the resources is the same as the SL PRS sequence sent on the j-th symbol of the second part of the resources, where j is an integer; the RE occupied by the SL PRS sent on the j-th symbol of the first part of the resources on the RB is the same as the RE position occupied by the SL PRS sent on the j-th symbol of the second part of the resources on the RB.

[0272] Optionally, the first part of resources includes OFDM symbols 0-(C-1) in the first time slot, and the OFDM symbols of the second part of resources start from the Cth symbol in the first time slot. The SL PRS sequence sent by the UE on OFDM symbols 0, 1, ..., C-1 where the PSCCH is located is the SL PRS sequence sent on the C OFDM symbols used for SL PRS starting from OFDM symbol C, and the occupied REs are also the same as the C OFDM symbols.

[0273] For example, the symbols used for PSCCH transmission are symbols 0-2, and the SL PRS sequences transmitted on symbols 3-5 are 0000, 1111, and 1100 respectively, then the SL PRS sequences transmitted on symbols 0-2 are 0000, 1111, and 1100 respectively.

[0274] (5) The first part of the resources includes C symbols, where C is a positive integer. The SL PRS sequence sent on the Ck-th symbol of the first part of the resources is the same as the SL PRS sequence sent on the k+1-th symbol from the end of the second part of the resources, where k is an integer less than C. The REs occupied by the SL PRS sent on the Ck-th symbol of the first part of the resources are the same as the RE positions occupied by the SL PRS sent on the k+1-th symbol from the end of the second part of the resources.

[0275] Optionally, the first part of resources includes OFDM symbols 0-(C-1) in the first time slot, and the OFDM symbols of the second part of resources start from the Cth symbol in the first time slot. The SL PRS sequence sent by the UE on OFDM symbols 0, 1, ..., C-1 where the PSCCH is located, and the SL PRS sequence sent on the last C OFDM symbols in the time slot, also occupies the same REs as the C OFDM symbols.

[0276] For example, the symbols used for PSCCH transmission are symbols 0-2, and the SL PRS sequences transmitted on symbols 11-13 are 0000, 1111, and 1100 respectively, then the SL PRS sequences transmitted on symbols 0-2 are 0000, 1111, and 1100 respectively.

[0277] In this method, for any OFDM symbol used for SL PRS in the time slot, that is, from OFDM symbol C to the last OFDM symbol used for SL PRS in the time slot, the RE offset occupied by SL PRS is determined according to the interval of the OFDM symbol relative to OFDM symbol C.

[0278] In mode 2, the terminal can send PSCCH and PSSCH in the time slot of sending SL PRS. PSCCH carries the first-order SCI and PSSCH carries the second-order SCI.

[0279] Please refer to Figure 30, step 213 may include step 215.

[0280] Step 215: When the network configuration or pre-configuration indicates that reserved resources are allowed in the SL PRS resource pool, SL PRS, PSCCH and PSSCH are sent in the first time slot. PSCCH carries the first-order SCI, PSSCH carries the second-order SCI, and SCI is used to indicate the reserved resources of SL PRS.

[0281] Optionally, there is time-frequency overlap between the SL PRS resource pool and the SL-U communication resource pool in the time slot where the reserved resources are located.

[0282] The UE that sends the SL PRS sends the PSCCH in the time slot in which the SL PRS is sent, and at the same time sends the PSSCH in the same time slot, wherein the PSCCH carries the second-order SCI to indicate the sending of the SL PRS.

[0283] In this embodiment, SCI includes first-order SCI and second-order SCI. That is, SCI-P is divided into first-order SCI-P and second-order SCI-P. The first-order SCI-P is carried by the PSCCH, and the second-order SCI-P is carried by the PSSCH. The first-order SCI-P and the second-order SCI-P carry different information. For example, the first-order SCI-P is used to carry the SL PRS time-frequency resource information, and the second-order SCI-P is used to carry the SL PRS sequence ID and other information.

[0284] In this embodiment, in the DMRS pattern of the PSSCH, the DMRS exists in the first OFDM symbol used to transmit the PSCCH. The DMRS pattern of the PSSCH selected by the UE should ensure that the DMRS exists in the first OFDM symbol used to transmit the PSCCH.

[0285] Specifically, the time-frequency resources for sending PSCCH and PSSCH can be:

[0286] Mode 2.1: SL PRS is not transmitted on the symbol where PSCCH is located. PSCCH is transmitted in the first subchannel used for SL PRS transmission, and the remaining IRBs on the symbol where PSCCH is located are used to transmit PSSCH.

[0287] The time-frequency resources of PSCCH include: part or all of the IRB / RB in the first subchannel used for SL PRS transmission on the OFDM symbol used for PSCCH transmission in the first time slot.

[0288] The time-frequency resources of SL PRS include: part or all of the IRB / RB in the subchannel used for SL PRS transmission on the OFDM symbols other than those used for PSCCH in the first time slot.

[0289] The time-frequency resources of the PSSCH include: part or all of the IRBs / RBs that are not used to send the PSCCH on the OFDM symbols used for sending the PSCCH in the first time slot.

[0290] That is, SL PRS is not sent on the OFDM symbol where PSCCH is located. The UE occupies one or all IRBs in the first subchannel used for SL PRS transmission to send PSCCH on the OFDM symbol used for PSCCH transmission in the time slot, and sends PSSCH on the remaining IRBs.

[0291] For example, as shown in (1) in Figure 31, it is a time-frequency resource diagram for SL PRS transmission in the first time slot. The first time slot includes 14 symbols, and the frequency domain resources for SL PRS transmission include four sub-channels. Among them, symbol 3, symbol 4, and symbol 5 are OFDM symbols for PSCCH transmission. Based on the time-frequency resource diagram shown in Figure 31 (1), as shown in (2) in Figure 31, the time-frequency resources for sending PSCCH in method 2.1 are part or all of the IRB / RB in the first sub-channel on symbols 3, 4, and 5; the time-frequency resources for sending PSSCH are part or all of the IRB / RB in the first sub-channel on symbols 3, 4, and 5 that are not used to send PSCCH; the time-frequency resources for sending SL PRS are part or all of the IRB / RB in the four sub-channels on symbols 6-13.

[0292] Optionally, when the SL PRS is sent in the first time slot, the frequency domain resources used for SL PRS transmission include part or all of the PRBs in the SL PRS resource pool. If the UE sends the SL PRS in a time slot, the UE occupies all or part of the PRBs in the resource pool.

[0293] The DMRS pattern of the PSSCH selected by the UE should ensure that the DMRS exists in the first OFDM symbol used for the PSCCH.

[0294] Mode 2.2: SL PRS is not transmitted on the symbol where PSCCH is located. Multiple groups of resources for transmitting PSCCH, PSSCH and SL PRS are set in one time slot. Different SL PRS resources are used to correspond to different PSCCH / PSSCH resources.

[0295] The first time slot includes multiple groups of time-frequency resources for PSCCH, and a group of time-frequency resources for PSCCH includes: part or all of the IRBs on the OFDM symbols used for PSCCH transmission; the first time slot includes multiple groups of time-frequency resources for PSSCH, and a group of time-frequency resources for PSSCH includes: part or all of the IRBs on the OFDM symbols used for PSSCH transmission; the time-frequency resources of SL PRS adopt a comb-tooth structure; the first time slot includes multiple time-frequency resources for SL PRS, and a time-frequency resource of SL PRS includes: a group of comb-tooth structure resources on the OFDM symbols in the first time slot except those used for PSCCH and PSSCH transmission; a group of time-frequency resources for PSCCH, a group of time-frequency resources for PSSCH, and a time-frequency resource for SL PRS correspond one to one.

[0296] In this method, there are multiple SL PRS resources in the frequency domain, and different SL PRS resources correspond to different PSCCH / PSSCH resources. For example, SL PRS adopts a comb-tooth structure, and different RE offsets on the first OFDM symbol used for SL PRS transmission in the time slot correspond to different SL PRS resources.

[0297] The multiple time-frequency resources of SL PRS are sorted according to the resource element RE offset of the comb-tooth structure; when the i-th time-frequency resource of SL PRS is used to send SL PRS, the time-frequency resources for sending PSCCH are: part or all of the IRBs used for PSCCH transmission in the i-th sub-channel in the SL PRS resource pool, where i is an integer; when the i-th time-frequency resource of SL PRS is used to send SL PRS, the time-frequency resources for sending PSSCH are: part or all of the IRBs not used for PSCCH transmission in the i-th sub-channel in the SL PRS resource pool, where i is an integer.

[0298] In this method, the PSCCH / PSSCH resources are one or more contiguous subchannels. Part or all of the IRBs in the first subchannel within a subchannel are used for PSCCH transmission, and the remaining IRBs are used for PSSCH transmission. If a UE occupies the i-th SL PRS resource, the UE transmits the PSCCH / PSSCH within the i-th PSCCH / PSSCH resource occupied by the SL PRS.

[0299] That is, the time-frequency resources for sending SL PRS are: on the OFDM symbol after the OFDM symbol used to send PSCCH in the first time slot, starting from the i-th subchannel to the last subchannel occupied by SL PRS.

[0300] For example, as shown in (1) in Figure 32, this is the time-frequency resource diagram for SL PRS transmission in the first time slot. The first time slot includes 14 symbols, and the frequency domain resources for SL PRS transmission include two subchannels, one subchannel includes ten RBs, and one RB includes 12 REs. SL PRS has a comb-tooth structure with a comb-tooth size of 2. An RE offset of 0 corresponds to SL PRS resource 0, and an RE offset of 1 corresponds to SL PRS resource 1. Symbol 3, symbol 4, and symbol 5 are OFDM symbols for PSCCH transmission. The resources for transmitting PSCCH in the first subchannel are PSCCH resource 0, and the resources for transmitting PSCCH in the second subchannel are PSCCH resource 1; the resources for transmitting PSSCH in the first subchannel are PSSCH resource 0, and the resources for transmitting PSSCH in the second subchannel are PSSCH resource 1. Based on the time-frequency resource diagram shown in Figure 32 (1), SL PRS resource 0 corresponds to PSCCH resource 0 and PSSCH resource 0, and SL PRS resource 1 corresponds to PSCCH resource 1 and PSSCH resource 1. As shown in (2) in Figure 32, if SL PRS resource 1 is used to send SL PRS in method 2.2, the time-frequency resources used to send PSCCH are PSCCH resource 1 in the second subchannel on symbols 3, 4, and 5; the time-frequency resources used to send PSSCH are PSSCH resource 1 in the second subchannel on symbols 3, 4, and 5; the time-frequency resources used to send SL PRS are SL PRS resource 1 corresponding to the RE offset of 1 in the second subchannel on symbols 6-13.

[0301] This approach can support multiple UEs sending SL PRS in the same time slot through frequency division multiplexing.

[0302] Mode 2.3: SL PRS can be sent in the symbol where PSCCH is located.

[0303] The time-frequency resources of PSCCH include: part or all of the IRBs / RBs in one or more sub-channels used for SL PRS transmission on the OFDM symbols used for PSCCH transmission in the first time slot; the time-frequency resources of PSSCH include: part or all of the IRBs / RBs not used for PSCCH transmission on the symbols used for PSCCH transmission and on the OFDM symbols used for PSSCH transmission in the first time slot; the time-frequency resources of SL PRS include: a first part of resources and a second part of resources; wherein, the first part of resources include: part or all of the IRBs / RBs not used for PSCCH or PSSCH on the OFDM symbols used for PSCCH transmission and on the OFDM symbols used for PSSCH transmission in the first time slot; the second part of resources include: part or all of the IRBs / RBs in the sub-channels used for SL PRS transmission on the OFDM symbols other than those used for PSCCH and PSSCH transmission in the first time slot.

[0304] Optionally, the second part of resources includes part or all of the IRB / RB in the subchannel used for SL PRS transmission on the OFDM symbol following the OFDM symbol used for PSCCH transmission in the first time slot.

[0305] For example, the terminal can send SL PRS on the OFDM symbol where the PSCCH is located, but the receiving UE is not required to process the SL PRS sent on these OFDM symbols. If the terminal capability of the receiving UE is strong enough, the receiving UE can process the SL PRS on these OFDM symbols. If the terminal capability of the receiving UE is weak, the SL PRS on these OFDM symbols may not be processed.

[0306] Optionally, when determining the RE offset of SL PRS on different OFDM symbols, the OFDM symbols used to send PSCCH are not considered. That is, the RE offset of the SL PRS comb structure is calculated according to the RE offset on the OFDM symbols in the second part of the resources, and the RE offset on the OFDM symbols in the first part of the resources is not considered.

[0307] In this method, the PSCCH carrying the first-order SCI-P and the PSSCH carrying the second-order SCI-P are sent in the first one or more subchannels occupied by the SL PRS. Within the OFDM symbol where the PSCCH / PSSCH is located, the UE can send the SL PRS except on other IRBs used to send the PSCCH / PSSCH.

[0308] For example, as shown in (1) in FIG33 , it is a time-frequency resource diagram for SL PRS transmission in the first time slot. The first time slot includes 14 symbols, and the frequency domain resources for SL PRS transmission include four sub-channels. Among them, symbol 3, symbol 4, and symbol 5 are OFDM symbols for PSCCH transmission. Based on the time-frequency resource diagram shown in FIG33 (1), as shown in (2) in FIG33 , the time-frequency resources for transmitting PSCCH in method 2.3 are part or all of the IRB / RB in the first sub-channel on symbols 3, 4, and 5; the time-frequency resources for transmitting PSSCH are part or all of the IRB / RB in the first sub-channel on symbols 3, 4, and 5 that are not used for transmitting PSCCH; the time-frequency resources for transmitting SL PRS are part or all of the IRB / RB in the four sub-channels on symbols 3-13 that are not used for transmitting PSCCH and PSSCH.

[0309] For example, the SL PRS sequence sent on the first part of resources and the method adopted by the RE position of sending the SL PRS can refer to the relevant description in method 1.3.

[0310] To sum up, the method provided in this embodiment is that when the terminal sending SL PRS reserves resources in the overlapping time slot for SL PRS transmission, it needs to send SCI-P that can be recognized by the backward UE, that is, the structure and transmission method of SCI-P and SCI-C are the same. This is to inform the backward UE of the reserved SL PRS resources, thereby avoiding the conflict between SL PRS transmission resources and SL-U communication resources, reducing the mutual interference between SL PRS and SL-U data, and improving the positioning accuracy of the SL PRS system.

[0311] It should be noted that the method steps in the above embodiments can be arbitrarily combined to obtain new embodiments, and this application does not impose any restrictions on this.

[0312] FIG34 shows a block diagram of a device for transmitting side control information provided by an exemplary embodiment of the present application. The device may be implemented as a terminal, or as a part of a terminal. The device includes:

[0313] The sending module 301 is configured to send the SL PRS and sidelink control information SCI according to network configuration or pre-configuration, where the SCI is used to indicate resource reservation status of the SL PRS.

[0314] In an optional embodiment, when each time slot in the SL PRS resource pool has resources overlapping with the SL-U communication resource pool, the SCI is not used to indicate the reserved resources of the SL PRS.

[0315] In an optional embodiment, when the network configuration or pre-configuration indicates that reserved resources are not allowed in the SL PRS resource pool, the SCI is used to indicate reserved resources for the SL PRS.

[0316] In an optional embodiment, when the network configuration or pre-configuration indicates a reservable time slot, the SCI is used to indicate reserved resources of the SL PRS, and the reserved resources are transmission resources in the reservable time slot.

[0317] In an optional embodiment, the SCI is positioning side control information SCI-P; the format of the SCI-P is different from that of the communication side control information SCI-C, and / or the SCI-P and the SCI-C are sent in different ways.

[0318] In an optional embodiment, when the network configuration or pre-configuration indicates that reserved resources are allowed in the SL PRS resource pool, the SCI is used to indicate the reserved resources of the SL PRS.

[0319] In an optional embodiment, when the physical sidelink control channel PSCCH in the SL PRS resource pool is sent using continuous resource blocks RB, the PSCCH carrying the SCI is sent using continuous RBs.

[0320] In an optional embodiment, when the PSCCH in the SL PRS resource pool is sent using a continuous interleaved resource block IRB structure, the PSCCH carrying the SCI is sent using an IRB structure.

[0321] In an optional embodiment, the sending module 301 is configured to send the SL PRS and PSCCH in a first time slot, where the PSCCH carries the SCI.

[0322] In an optional embodiment, the time-frequency resources of the PSCCH include: part or all of the IRBs in the first subchannel used for SL PRS transmission on the orthogonal frequency division multiplexing OFDM symbol used for PSCCH transmission in the first time slot.

[0323] In an optional embodiment, when the SL PRS is sent by occupying the first time slot, the frequency domain resources used for SL PRS transmission include part or all of the physical resource blocks PRBs in the SL PRS resource pool.

[0324] In an optional embodiment, the first time slot includes multiple groups of time-frequency resources of the PSCCH, and the group of time-frequency resources of the PSCCH includes: part or all of the IRBs on the OFDM symbol used for PSCCH transmission;

[0325] The time-frequency resources of the SL PRS adopt a comb-tooth structure; the first time slot includes one or more time-frequency resources of the SL PRS, and one time-frequency resource of the SL PRS includes: a group of comb-tooth structure resources on part or all OFDM symbols in the first time slot except those used for PSCCH transmission;

[0326] A group of time-frequency resources of the PSCCH corresponds one-to-one to a time-frequency resource of the SL PRS.

[0327] In an optional embodiment, the multiple time-frequency resources of the SL PRS are sorted according to the resource element RE offset of the comb-tooth structure;

[0328] When the SL PRS is sent using the i-th time-frequency resource of the SL PRS, the time-frequency resource for sending the PSCCH is: part or all of the IRBs used for PSCCH transmission in the i-th subchannel in the SL PRS resource pool, where i is an integer.

[0329] In an optional embodiment, the time-frequency resources of the PSCCH include: part or all of the IRBs in the first subchannel used for SL PRS transmission on the OFDM symbol used for PSCCH transmission in the first time slot;

[0330] The time-frequency resources of the SL PRS include: a first part of resources and a second part of resources;

[0331] The first part of resources includes: part or all of the IRBs not used for sending PSCCH on the OFDM symbols used for sending PSCCH in the first time slot;

[0332] The second part of resources includes: part or all of the IRBs in the subchannel used for SL PRS transmission on the OFDM symbols other than those used for PSCCH in the first time slot.

[0333] In an optional embodiment, the SL PRS sequence sent on the first part of resources is the same as the demodulation reference signal DMRS sequence of the PSCCH;

[0334] The REs occupied by the SL PRS sent on the first part of resources on the RB are the same as the RE positions occupied by the DMRS of the PSCCH on the RB.

[0335] In an optional embodiment, the SL PRS sequence sent on the first part of resources is a subsequent part of the DMRS sequence of the PSCCH;

[0336] The REs occupied by the SL PRS sent on the first part of resources on the RB are the same as the RE positions occupied by the DMRS of the PSCCH on the RB.

[0337] In an optional embodiment, the SL PRS sequence sent on the first part of resources is the same as the SL PRS sequence sent on the first symbol of the second part of resources;

[0338] The REs occupied by the SL PRS sent on the first part of resources on the RB are the same as the RE positions occupied by the SL PRS sent on the first symbol of the second part of resources on the RB.

[0339] In an optional embodiment, the SL PRS sequence sent on the j-th symbol of the first part of resources is the same as the SL PRS sequence sent on the j-th symbol of the second part of resources, where j is an integer;

[0340] The REs occupied by the SL PRS sent on the j-th symbol of the first part of resources on the RB are the same as the RE positions occupied by the SL PRS sent on the j-th symbol of the second part of resources on the RB.

[0341] In an optional embodiment, the first part of resources includes C symbols, where C is a positive integer;

[0342] Sending an SL PRS sequence on the Ck-th symbol of the first part of resources, which is the same as the SL PRS sequence sent on the penultimate (k+1)-th symbol of the second part of resources, where k is an integer less than C;

[0343] The REs occupied by the SL PRS sent on the Ck-th symbol of the first part of resources on the RB are the same as the RE positions occupied by the SL PRS sent on the penultimate (k+1)-th symbol of the second part of resources on the RB.

[0344] In an optional embodiment, the SCI includes a first-order SCI and a second-order SCI;

[0345] The sending module 301 is configured to send the SL PRS, PSCCH and physical sidelink shared channel PSSCH in a first time slot, the PSCCH carries the first-order SCI, and the PSSCH carries the second-order SCI.

[0346] In an optional embodiment, in the DMRS pattern of the PSSCH, a DMRS exists in the first OFDM symbol used to send the PSCCH.

[0347] In an optional embodiment, the time-frequency resources of the PSCCH include: part or all of the IRBs in the first subchannel used for SL PRS transmission on the OFDM symbol used for PSCCH transmission in the first time slot;

[0348] The time-frequency resources of the SL PRS include: part or all of the IRBs in the subchannel used for SL PRS transmission on the OFDM symbols other than those used for PSCCH in the first time slot;

[0349] The time-frequency resources of the PSSCH include: part or all of the IRBs that are not used to send the PSCCH on the orthogonal frequency division multiplexing OFDM symbols used for sending the PSCCH in the first time slot.

[0350] In an optional embodiment, when the SL PRS is sent by occupying the first time slot, the frequency domain resources used for SL PRS transmission include part or all of the physical resource blocks PRBs in the SL PRS resource pool.

[0351] In an optional embodiment, the first time slot includes multiple groups of time-frequency resources of the PSCCH, and the group of time-frequency resources of the PSCCH includes: part or all of the IRBs on the OFDM symbol used for PSCCH transmission;

[0352] The first time slot includes multiple groups of time-frequency resources of the PSSCH, and the group of time-frequency resources of the PSSCH includes: part or all of the IRBs on the OFDM symbol used for PSSCH transmission;

[0353] The time-frequency resources of the SL PRS adopt a comb-tooth structure; the first time slot includes multiple time-frequency resources of the SL PRS, and one time-frequency resource of the SL PRS includes: a group of comb-tooth structure resources on the OFDM symbols in the first time slot except for the transmission of PSCCH and PSSCH;

[0354] A group of time-frequency resources of the PSCCH, a group of time-frequency resources of the PSSCH, and a time-frequency resource of the SL PRS correspond one to one.

[0355] In an optional embodiment, the multiple time-frequency resources of the SL PRS are sorted according to the resource element RE offset of the comb-tooth structure;

[0356] In the case where the SL PRS is sent using the i-th time-frequency resource of the SL PRS, the time-frequency resource for sending the PSCCH is: part or all of the IRBs used for PSCCH transmission in the i-th subchannel in the SL PRS resource pool, where i is an integer;

[0357] When the SL PRS is sent using the i-th time-frequency resource of the SL PRS, the time-frequency resource for sending the PSSCH is: part or all of the IRBs in the i-th subchannel in the SL PRS resource pool that are not used for PSCCH transmission, where i is an integer.

[0358] In an optional embodiment, the time-frequency resources of the PSCCH include: part or all of the IRBs in one or more subchannels used for SL PRS transmission on the OFDM symbol used for PSCCH transmission in the first time slot;

[0359] The time-frequency resources of the PSSCH include: part or all of the IRBs not used for PSCCH transmission on the symbols used for PSCCH transmission and on the OFDM symbols used for PSSCH transmission in the first time slot;

[0360] The time-frequency resources of the SL PRS include: a first part of resources and a second part of resources;

[0361] The first part of resources includes: part or all of the IRBs not used for transmitting the PSCCH or PSSCH on the OFDM symbols used for transmitting the PSCCH and the OFDM symbols used for transmitting the PSSCH in the first time slot;

[0362] The second part of resources includes: part or all of the IRBs in the subchannel used for SL PRS transmission on the OFDM symbols other than those used for PSCCH and PSSCH transmission in the first time slot.

[0363] In an optional embodiment, the SCI is positioning side control information SCI-P; the format and sending method of the SCI-P and the communication side control information SCI-C are the same.

[0364] In an optional embodiment, the SCI-P includes at least one of the following information:

[0365] The identification ID information of the SL PRS;

[0366] The time-frequency resource position occupied by the SL PRS;

[0367] The number of repetitions of the SL PRS and the time-frequency resource locations used for repeated transmission;

[0368] The transmission period of the SL PRS;

[0369] The SL PRS sends terminal related information.

[0370] Figure 35 shows a schematic structural diagram of a communication device (terminal or network device) provided by an exemplary embodiment of the present application. The communication device includes: a processor 101, a receiver 102, a transmitter 103, a memory 104 and a bus 105.

[0371] The processor 101 includes one or more processing cores. The processor 101 executes various functional applications and information processing by running software programs and modules.

[0372] The receiver 102 and the transmitter 103 may be implemented as a communication component, which may be a communication chip, and may be referred to as a transceiver.

[0373] The memory 104 is connected to the processor 101 via a bus 105 .

[0374] The memory 104 may be used to store at least one instruction, and the processor 101 may be used to execute the at least one instruction to implement each step in the above method embodiment.

[0375] In addition, the memory 104 can be implemented by any type of volatile or non-volatile storage device or a combination thereof. Volatile or non-volatile storage devices include but are not limited to: magnetic disks or optical disks, electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), static random access memory (SRAM), read-only memory (ROM), magnetic memory, flash memory, and programmable read-only memory (PROM).

[0376] Among them, when the communication device is implemented as a terminal, the processor and transceiver in the communication device involved in the embodiments of the present application can execute the steps performed by the terminal in any of the methods shown above, which will not be repeated here.

[0377] In a possible implementation, when the communication device is implemented as a terminal,

[0378] The transceiver is used to send SL PRS and side control information SCI based on the resource overlap between the sidelink positioning reference signal SL PRS resource pool and the unauthorized sidelink SL-U communication resource pool, according to network configuration or pre-configuration, and the SCI is used to indicate the resource reservation status of the SL PRS.

[0379] In an exemplary embodiment, a computer-readable storage medium is also provided, in which at least one instruction, at least one program, code set or instruction set is stored. The at least one instruction, the at least one program, the code set or instruction set is loaded and executed by a processor to implement the side control information sending method performed by the communication device provided in the above-mentioned various method embodiments.

[0380] In an exemplary embodiment, a chip is further provided, which includes a programmable logic circuit and / or program instructions. When the chip runs on a communication device, it is used to enable the communication device to implement the method for sending side control information described in the above aspect.

[0381] In an exemplary embodiment, a computer program product is further provided. When the computer program product is executed on a processor of a communication device, the communication device executes the method for sending sidelink control information described in the above aspects.

[0382] Those skilled in the art will understand that all or part of the steps to implement the above embodiments may be accomplished by hardware, or by a program to instruct the relevant hardware, and the program may be stored in a computer-readable storage medium, which may be a read-only memory, a disk, or an optical disk, etc.

[0383] The above description is merely an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A method for transmitting side control information, characterized in that: The method is executed by a terminal, and includes: According to network configuration or pre-configuration, a sidelink positioning reference signal SL PRS and sidelink control information SCI are sent, where the SCI is used to indicate resource reservation status of the SL PRS.

2. The method according to claim 1, characterized in that In the case where the network configuration or pre-configuration indicates that reserved resources are not allowed in the SL PRS resource pool, the SCI is not used to indicate reserved resources for the SL PRS.

3. The method according to claim 1, characterized in that In the case where the network configuration or pre-configuration does not indicate a reservable time slot, the SCI is not used to indicate reserved resources for the SL PRS.

4. The method according to claim 1, wherein In the case where the network configuration or pre-configuration indicates a reservable time slot, the SCI is used to indicate reserved resources of the SL PRS, and the reserved resources are transmission resources in the reservable time slot.

5. The method according to any one of claims 1 to 4, characterized in that: The SCI is positioning side control information SCI-P; the format of the SCI-P is different from that of the communication side control information SCI-C, and / or the SCI-P and the SCI-C are sent in different ways.

6. The method according to claim 1, wherein In the case where the network configuration or pre-configuration indicates that reserved resources are allowed in the SL PRS resource pool, the SCI is used to indicate the reserved resources of the SL PRS.

7. The method according to claim 6, characterized in that In the case where the physical sidelink control channel PSCCH in the SL PRS resource pool is sent using continuous resource blocks RB, the PSCCH carrying the SCI is sent using continuous RBs.

8. The method according to claim 6, characterized in that In the case where the PSCCH in the SL PRS resource pool is sent using a continuous interleaved resource block IRB structure, the PSCCH carrying the SCI is sent using an IRB structure.

9. The method according to any one of claims 7 to 8, characterized in that: The sending of SL PRS and SCI includes: The SL PRS and PSCCH are sent in the first time slot, and the PSCCH carries the SCI.

10. The method according to claim 9, characterized in that The time-frequency resources of the PSCCH include: part or all of the IRBs in the first subchannel used for SL PRS transmission on the orthogonal frequency division multiplexing OFDM symbol used for PSCCH transmission in the first time slot.

11. The method according to claim 10, characterized in that In the case of occupying the first time slot to send the SL PRS, the frequency domain resources used for SL PRS transmission include part or all of the physical resource blocks PRBs in the SL PRS resource pool.

12. The method according to claim 9, characterized in that The first time slot includes multiple groups of time-frequency resources of the PSCCH, and the group of time-frequency resources of the PSCCH includes: part or all of the IRBs on the OFDM symbol used for PSCCH transmission; The time-frequency resources of the SL PRS adopt a comb-tooth structure; the first time slot includes one or more time-frequency resources of the SL PRS, and one time-frequency resource of the SL PRS includes: a group of comb-tooth structure resources on part or all OFDM symbols in the first time slot except those used for PSCCH transmission; A group of time-frequency resources of the PSCCH corresponds one-to-one to a time-frequency resource of the SL PRS.

13. The method according to claim 12, characterized in that The multiple time-frequency resources of the SL PRS are sorted according to the resource element RE offset of the comb-tooth structure; When the SL PRS is sent using the i-th time-frequency resource of the SL PRS, the time-frequency resource for sending the PSCCH is: part or all of the IRBs used for PSCCH transmission in the i-th subchannel in the SL PRS resource pool, where i is an integer.

14. The method according to claim 9, characterized in that The time-frequency resources of the PSCCH include: part or all of the IRBs in the first subchannel used for SL PRS transmission on the OFDM symbol used for PSCCH transmission in the first time slot; The time-frequency resources of the SL PRS include: a first part of resources and a second part of resources; The first part of resources includes: part or all of the IRBs not used for sending PSCCH on the OFDM symbols used for sending PSCCH in the first time slot; The second part of resources includes: part or all of the IRBs in the subchannel used for SL PRS transmission on the OFDM symbols other than those used for PSCCH in the first time slot.

15. The method according to claim 14, characterized in that The SL PRS sequence sent on the first part of resources is the same as the demodulation reference signal DMRS sequence of the PSCCH; The REs occupied by the SL PRS sent on the first part of resources on the RB are the same as the RE positions occupied by the DMRS of the PSCCH on the RB.

16. The method according to claim 14, characterized in that Sending an SL PRS sequence as a subsequent part of the DMRS sequence of the PSCCH on the first part of resources; The REs occupied by the SL PRS sent on the first part of resources on the RB are the same as the RE positions occupied by the DMRS of the PSCCH on the RB.

17. The method according to claim 14, characterized in that The SL PRS sequence sent on the first part of resources is the same as the SL PRS sequence sent on the first symbol of the second part of resources; The REs occupied by the SL PRS sent on the first part of resources on the RB are the same as the RE positions occupied by the SL PRS sent on the first symbol of the second part of resources on the RB.

18. The method according to claim 14, characterized in that Sending an SL PRS sequence on the j-th symbol of the first part of resources, which is the same as the SL PRS sequence sent on the j-th symbol of the second part of resources, where j is an integer; The REs occupied by the SL PRS sent on the j-th symbol of the first part of resources on the RB are the same as the RE positions occupied by the SL PRS sent on the j-th symbol of the second part of resources on the RB.

19. The method according to claim 14, wherein The first part of the resource includes C symbols, where C is a positive integer; Sending an SL PRS sequence on the Ck-th symbol of the first part of resources, which is the same as the SL PRS sequence sent on the penultimate (k+1)-th symbol of the second part of resources, where k is an integer less than C; The REs occupied by the SL PRS sent on the Ck-th symbol of the first part of resources on the RB are the same as the RE positions occupied by the SL PRS sent on the penultimate (k+1)-th symbol of the second part of resources on the RB.

20. The method according to any one of claims 6 to 8, characterized in that The SCI includes first-order SCI and second-order SCI; The sending of the SL PRS and the sideline control information SCI includes: The SL PRS, PSCCH and physical sidelink shared channel PSSCH are sent in a first time slot, the PSCCH carries the first-order SCI, and the PSSCH carries the second-order SCI.

21. The method according to claim 20, characterized in that In the DMRS pattern of the PSSCH, a DMRS exists in the first OFDM symbol used to transmit the PSCCH.

22. The method according to claim 20 or 21, characterized in that The time-frequency resources of the PSCCH include: part or all of the IRBs in the first subchannel used for SL PRS transmission on the OFDM symbol used for PSCCH transmission in the first time slot; The time-frequency resources of the SL PRS include: part or all of the IRBs in the subchannel used for SL PRS transmission on the OFDM symbols other than those used for PSCCH in the first time slot; The time-frequency resources of the PSSCH include: part or all of the IRBs that are not used to send the PSCCH on the orthogonal frequency division multiplexing OFDM symbols used for sending the PSCCH in the first time slot.

23. The method according to claim 22, characterized in that In the case of occupying the first time slot to send the SL PRS, the frequency domain resources used for SL PRS transmission include part or all of the physical resource blocks PRBs in the SL PRS resource pool.

24. The method according to claim 20 or 21, characterized in that The first time slot includes multiple groups of time-frequency resources of the PSCCH, and the group of time-frequency resources of the PSCCH includes: part or all of the IRBs on the OFDM symbol used for PSCCH transmission; The first time slot includes multiple groups of time-frequency resources of the PSSCH, and the group of time-frequency resources of the PSSCH includes: part or all of the IRBs on the OFDM symbol used for PSSCH transmission; The time-frequency resources of the SL PRS adopt a comb-tooth structure; the first time slot includes multiple time-frequency resources of the SL PRS, and one time-frequency resource of the SL PRS includes: a group of comb-tooth structure resources on the OFDM symbols in the first time slot except for the transmission of PSCCH and PSSCH; A group of time-frequency resources of the PSCCH, a group of time-frequency resources of the PSSCH, and a time-frequency resource of the SL PRS correspond one to one.

25. The method according to claim 24, characterized in that The multiple time-frequency resources of the SL PRS are sorted according to the resource element RE offset of the comb-tooth structure; In the case where the SL PRS is sent using the i-th time-frequency resource of the SL PRS, the time-frequency resource for sending the PSCCH is: part or all of the IRBs used for PSCCH transmission in the i-th subchannel in the SL PRS resource pool, where i is an integer; When the SL PRS is sent using the i-th time-frequency resource of the SL PRS, the time-frequency resource for sending the PSSCH is: part or all of the IRBs in the i-th subchannel in the SL PRS resource pool that are not used for PSCCH transmission, where i is an integer.

26. The method according to claim 20 or 21, characterized in that The time-frequency resources of the PSCCH include: part or all of the IRBs in one or more subchannels used for SL PRS transmission on the OFDM symbol used for PSCCH transmission in the first time slot; The time-frequency resources of the PSSCH include: part or all of the IRBs not used for PSCCH transmission on the symbols used for PSCCH transmission and on the OFDM symbols used for PSSCH transmission in the first time slot; The time-frequency resources of the SL PRS include: a first part of resources and a second part of resources; The first part of resources includes: part or all of the IRBs not used for transmitting the PSCCH or PSSCH on the OFDM symbols used for transmitting the PSCCH and the OFDM symbols used for transmitting the PSSCH in the first time slot; The second part of resources includes: part or all of the IRBs in the subchannel used for SL PRS transmission on the OFDM symbols other than those used for PSCCH and PSSCH transmission in the first time slot.

27. The method according to any one of claims 6 to 26, characterized in that The SCI is positioning side control information SCI-P; the format and sending method of the SCI-P are the same as those of the communication side control information SCI-C.

28. The method according to claim 5 or 27, characterized in that The SCI-P includes at least one of the following information: The identification ID information of the SL PRS; The time-frequency resource position occupied by the SL PRS; The number of repetitions of the SL PRS and the time-frequency resource locations used for repeated transmission; The transmission period of the SL PRS; The SL PRS sends terminal related information.

29. A device for transmitting side control information, characterized in that: The device is used to implement a terminal, and the device includes: The sending module is used to send SL PRS and side control information SCI according to network configuration or pre-configuration, and the SCI is used to indicate the resource reservation status of SL PRS.

30. A terminal, characterized in that: The terminal includes: a processor and a transceiver connected to the processor; wherein, The transceiver is used to send the SL PRS and sideline control information SCI according to network configuration or pre-configuration, and the SCI is used to indicate the resource reservation status of the SL PRS.

31. A terminal, characterized in that: The terminal includes: a processor and a memory, wherein the memory stores at least one instruction, at least one program, a code set or an instruction set, and the at least one instruction, the at least one program, the code set or the instruction set is loaded and executed by the processor to implement the method for sending side control information as described in any one of claims 1 to 28.

32. A computer-readable storage medium, characterized in that The readable storage medium stores executable instructions, which are loaded and executed by the processor to enable the communication device to implement the method for sending side control information according to any one of claims 1 to 28.

33. A chip, characterized in that: The chip includes a programmable logic circuit or a program, and a communication device equipped with the chip is used to implement the method for sending side control information as described in any one of claims 1 to 28.

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