CN117529893A

CN117529893A - Wireless communication method and terminal equipment

Info

Publication number: CN117529893A
Application number: CN202180099678.8A
Authority: CN
Inventors: 赵振山; 林晖闵; 张世昌
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2021-09-03
Filing date: 2021-09-03
Publication date: 2024-02-06
Also published as: WO2023028987A1

Abstract

The embodiment of the application provides a wireless communication method and terminal equipment, which are configured with CSI-RS resources for transmitting CSI-RS, and the CSI-RS is transmitted based on the configured CSI-RS resources, so that an optimal spatial transmission filter or an optimal spatial reception filter can be selected based on the transmitted CSI-RS. The method of wireless communication includes: the first terminal equipment sends M CSI-RSs to the second terminal equipment by using a spatial domain sending filter; one CSI-RS of the M CSI-RS occupies a second last time domain symbol and a third last time domain symbol of time domain symbols available for side line transmission in one time slot, the M CSI-RS are used for selecting a target spatial transmit filter, or the M CSI-RS are used for selecting a target spatial receive filter, and M is a positive integer.

Description

Wireless communication method and terminal equipment

Technical Field

The embodiment of the application relates to the field of communication, and more particularly, to a method and terminal equipment for wireless communication.

Background

In order to increase the transmission rate of the sidestream communication system, it is considered to use the millimeter wave band in the sidestream communication system, and in sidestream millimeter wave transmission, the transmitting end needs to transmit a channel state information reference signal (Channel State Information Reference Signal, CSI-RS) to determine an optimal spatial transmit filter of the transmitting end and/or determine an optimal spatial receive filter of the receiving end. However, how to configure CSI-RS resources for transmitting CSI-RS specifically to select an optimal spatial transmit filter or an optimal spatial receive filter based on the transmitted CSI-RS is a problem to be solved.

Disclosure of Invention

The embodiment of the application provides a wireless communication method and terminal equipment, which are configured with CSI-RS resources for transmitting CSI-RS, and the CSI-RS is transmitted based on the configured CSI-RS resources, so that an optimal spatial transmission filter or an optimal spatial reception filter can be selected based on the transmitted CSI-RS.

In a first aspect, a method of wireless communication is provided, the method comprising:

the first terminal equipment sends M CSI-RSs to the second terminal equipment by using a spatial domain sending filter;

one CSI-RS of the M CSI-RS occupies a second last time domain symbol and a third last time domain symbol of time domain symbols available for side line transmission in one time slot, the M CSI-RS are used for selecting a target spatial transmit filter, or the M CSI-RS are used for selecting a target spatial receive filter, and M is a positive integer.

In a second aspect, there is provided a method of wireless communication, the method comprising:

the second terminal equipment receives M CSI-RSs transmitted by the first terminal equipment by using a spatial domain transmission filter;

In a third aspect, a terminal device is provided for performing the method in the first aspect.

Specifically, the terminal device comprises functional modules for performing the method in the first aspect described above.

In a fourth aspect, a terminal device is provided for performing the method in the second aspect.

Specifically, the terminal device comprises a functional module for performing the method in the second aspect described above.

In a fifth aspect, a terminal device is provided comprising a processor and a memory. The memory is used for storing a computer program, and the processor is used for calling and running the computer program stored in the memory to execute the method in the first aspect.

In a sixth aspect, a terminal device is provided, comprising a processor and a memory. The memory is for storing a computer program and the processor is for calling and running the computer program stored in the memory for performing the method of the second aspect described above.

In a seventh aspect, there is provided an apparatus for implementing the method of any one of the first to second aspects.

Specifically, the device comprises: a processor for calling and running a computer program from a memory, causing a device in which the apparatus is installed to perform the method of any of the first to second aspects as described above.

In an eighth aspect, a computer-readable storage medium is provided for storing a computer program that causes a computer to execute the method of any one of the first to second aspects.

In a ninth aspect, there is provided a computer program product comprising computer program instructions for causing a computer to perform the method of any one of the first to second aspects above.

In a tenth aspect, there is provided a computer program which, when run on a computer, causes the computer to perform the method of any of the first to second aspects described above.

Through the technical scheme, the first terminal device uses the spatial domain transmission filter to transmit M CSI-RSs to the second terminal device, one CSI-RS in the M CSI-RSs occupies the second last time domain symbol and the third last time domain symbol in the time domain symbols available for side transmission in one time slot, namely, the embodiment of the application configures the second last time domain symbol and the third last time domain symbol in the time slot occupied by the CSI-RSs, so that the CSI-RSs are transmitted different from the PSCCH or the PSSCH, and the transmission efficiency of the CSI-RSs is optimized.

Drawings

Fig. 1 is a schematic diagram of a communication system architecture to which embodiments of the present application apply.

Fig. 2 is a schematic diagram of another communication system architecture to which embodiments of the present application apply.

Fig. 3 is a schematic diagram of network coverage area inside communication provided in the present application.

Fig. 4 is a schematic diagram of a partial network coverage sidestream communication provided herein.

Fig. 5 is a schematic diagram of a network overlay outside line communication provided herein.

Fig. 6 is a schematic diagram of a side-by-side communication in which a central control node is present, as provided herein.

Fig. 7 is a schematic diagram of a unicast sidestream communication provided herein.

Fig. 8 is a schematic diagram of a multicast side-line communication provided herein.

Fig. 9 is a schematic diagram of a broadcast side-by-side communication provided herein.

Fig. 10 is a schematic diagram of a slot structure in NR-V2X provided herein.

Fig. 11 is a schematic diagram of a SL CSI-RS time-frequency position provided herein.

Fig. 12 is a schematic diagram of one type of non-use and use of analog beams provided herein.

Fig. 13 is a schematic diagram of a TCI state of a PDSCH configuration provided in the present application.

Fig. 14 is a schematic flow chart diagram of a method of wireless communication provided in accordance with an embodiment of the present application.

Fig. 15 is a schematic diagram of CSI-RS symbols in a slot provided according to an embodiment of the present application.

Fig. 16 is a schematic diagram of CSI-RS symbols in another slot provided in accordance with an embodiment of the present application.

Fig. 17 is a schematic diagram of a CSI-RS resource with a period of 2 slots according to an embodiment of the present application.

Fig. 18 is a schematic diagram of a bit map indicating PRBs available for transmitting CSI-RS according to an embodiment of the present application.

Fig. 19 to 20 are schematic diagrams of determining PRBs usable for transmitting CSI-RS based on a starting frequency domain position and a frequency domain length, respectively, provided according to embodiments of the present application.

Fig. 21 is a schematic diagram of time domain resources of a CSI-RS resource set provided according to an embodiment of the present application.

Fig. 22 is a schematic diagram of a PRB that may be used for transmitting CSI-RS according to an embodiment of the present application.

Fig. 23 is a schematic block diagram of a terminal device according to an embodiment of the present application.

Fig. 24 is a schematic block diagram of another terminal device provided according to an embodiment of the present application.

Fig. 25 is a schematic block diagram of a communication device provided according to an embodiment of the present application.

Fig. 26 is a schematic block diagram of an apparatus provided in accordance with an embodiment of the present application.

Fig. 27 is a schematic block diagram of a communication system provided according to an embodiment of the present application.

Detailed Description

The following description of the technical solutions in the embodiments of the present application will be made with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden for the embodiments herein, are intended to be within the scope of the present application.

The technical solution of the embodiment of the application can be applied to various communication systems, for example: global system for mobile communications (Global System of Mobile communication, GSM), code division multiple access (Code Division Multiple Access, CDMA) system, wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) system, general packet Radio service (General Packet Radio Service, GPRS), long term evolution (Long Term Evolution, LTE) system, long term evolution advanced (Advanced long term evolution, LTE-a) system, new Radio, NR system evolution system, LTE over unlicensed spectrum (LTE-based access to unlicensed spectrum, LTE-U) system, NR over unlicensed spectrum (NR-based access to unlicensed spectrum, NR-U) system, non-terrestrial communication network (Non-Terrestrial Networks, NTN) system, universal mobile telecommunication system (Universal Mobile Telecommunication System, UMTS), wireless local area network (Wireless Local Area Networks, WLAN), wireless fidelity (Wireless Fidelity, wiFi), fifth Generation communication (5 th-Generation, 5G) system, or other communication system, etc.

Generally, the number of connections supported by the conventional communication system is limited and easy to implement, however, with the development of communication technology, the mobile communication system will support not only conventional communication but also, for example, device-to-Device (D2D) communication, machine-to-machine (Machine to Machine, M2M) communication, machine type communication (Machine Type Communication, MTC), inter-vehicle (Vehicle to Vehicle, V2V) communication, or internet of vehicles (Vehicle to everything, V2X) communication, etc., and the embodiments of the present application may also be applied to these communication systems.

Optionally, the communication system in the embodiment of the present application may be applied to a carrier aggregation (Carrier Aggregation, CA) scenario, a dual connectivity (Dual Connectivity, DC) scenario, and a Stand Alone (SA) fabric scenario.

Optionally, the communication system in the embodiments of the present application may be applied to unlicensed spectrum, where unlicensed spectrum may also be considered as shared spectrum; alternatively, the communication system in the embodiments of the present application may also be applied to licensed spectrum, where licensed spectrum may also be considered as non-shared spectrum.

Embodiments of the present application describe various embodiments in connection with network devices and terminal devices, where a terminal device may also be referred to as a User Equipment (UE), access terminal, subscriber unit, subscriber station, mobile station, remote terminal, mobile device, user terminal, wireless communication device, user agent, user Equipment, or the like.

The terminal device may be a STATION (ST) in a WLAN, may be a cellular telephone, a cordless telephone, a session initiation protocol (Session Initiation Protocol, SIP) phone, a wireless local loop (Wireless Local Loop, WLL) STATION, a personal digital assistant (Personal Digital Assistant, PDA) device, a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, an in-vehicle device, a wearable device, a terminal device in a next generation communication system such as an NR network, or a terminal device in a future evolved public land mobile network (Public Land Mobile Network, PLMN) network, etc.

In embodiments of the present application, the terminal device may be deployed on land, including indoor or outdoor, hand-held, wearable or vehicle-mounted; can also be deployed on the water surface (such as ships, etc.); but may also be deployed in the air (e.g., on aircraft, balloon, satellite, etc.).

In the embodiment of the present application, the terminal device may be a Mobile Phone (Mobile Phone), a tablet computer (Pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an augmented Reality (Augmented Reality, AR) terminal device, a wireless terminal device in industrial control (industrial control), a wireless terminal device in unmanned driving (self driving), a wireless terminal device in remote medical (remote medical), a wireless terminal device in smart grid (smart grid), a wireless terminal device in transportation security (transportation safety), a wireless terminal device in smart city (smart city), or a wireless terminal device in smart home (smart home), and the like.

By way of example, and not limitation, in embodiments of the present application, the terminal device may also be a wearable device. The wearable device can also be called as a wearable intelligent device, and is a generic name for intelligently designing daily wear by applying wearable technology and developing wearable devices, such as glasses, gloves, watches, clothes, shoes and the like. The wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also can realize a powerful function through software support, data interaction and cloud interaction. The generalized wearable intelligent device includes full functionality, large size, and may not rely on the smart phone to implement complete or partial functionality, such as: smart watches or smart glasses, etc., and focus on only certain types of application functions, and need to be used in combination with other devices, such as smart phones, for example, various smart bracelets, smart jewelry, etc. for physical sign monitoring.

In this embodiment of the present application, the network device may be a device for communicating with a mobile device, where the network device may be an Access Point (AP) in a WLAN, a base station (Base Transceiver Station, BTS) in GSM or CDMA, a base station (NodeB, NB) in WCDMA, an evolved base station (Evolutional Node B, eNB or eNodeB) in LTE, a relay station or an Access Point, a vehicle device, a wearable device, a network device or a base station (gNB) in an NR network, a network device in a PLMN network of future evolution, or a network device in an NTN network, etc.

By way of example and not limitation, in embodiments of the present application, a network device may have a mobile nature, e.g., the network device may be a mobile device. Alternatively, the network device may be a satellite, a balloon station. For example, the satellite may be a Low Earth Orbit (LEO) satellite, a medium earth orbit (medium earth orbit, MEO) satellite, a geosynchronous orbit (geostationary earth orbit, GEO) satellite, a high elliptical orbit (High Elliptical Orbit, HEO) satellite, or the like. Alternatively, the network device may be a base station disposed on land, in a water area, or the like.

In this embodiment of the present application, a network device may provide a service for a cell, where a terminal device communicates with the network device through a transmission resource (e.g., a frequency domain resource, or a spectrum resource) used by the cell, where the cell may be a cell corresponding to a network device (e.g., a base station), and the cell may belong to a macro base station, or may belong to a base station corresponding to a Small cell (Small cell), where the Small cell may include: urban cells (Metro cells), micro cells (Micro cells), pico cells (Pico cells), femto cells (Femto cells) and the like, and the small cells have the characteristics of small coverage area and low transmitting power and are suitable for providing high-rate data transmission services.

It should be understood that the terms "system" and "network" are used interchangeably herein. The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

The terminology used in the description section of the present application is for the purpose of describing particular embodiments of the present application only and is not intended to be limiting of the present application. The terms "first," "second," "third," and "fourth" and the like in the description and in the claims of this application and in the drawings, are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

It should be understood that, in the embodiments of the present application, the "indication" may be a direct indication, an indirect indication, or an indication having an association relationship. For example, a indicates B, which may mean that a indicates B directly, e.g., B may be obtained by a; it may also indicate that a indicates B indirectly, e.g. a indicates C, B may be obtained by C; it may also be indicated that there is an association between a and B.

In the description of the embodiments of the present application, the term "corresponding" may indicate that there is a direct correspondence or an indirect correspondence between the two, or may indicate that there is an association between the two, or may indicate a relationship between the two and the indicated, configured, or the like.

In the embodiment of the present application, the "pre-defining" or "pre-configuring" may be implemented by pre-storing a corresponding code, a table or other manners that may be used to indicate relevant information in a device (including, for example, a terminal device and a network device), and the specific implementation manner is not limited in this application. Such as predefined may refer to what is defined in the protocol.

In this embodiment of the present application, the "protocol" may refer to a standard protocol in the communication field, for example, may include an LTE protocol, an NR protocol, and related protocols applied in a future communication system, which is not limited in this application.

In order to facilitate understanding of the technical solutions of the embodiments of the present application, the technical solutions of the present application are described in detail below through specific embodiments. The following related technologies may be optionally combined with the technical solutions of the embodiments of the present application, which all belong to the protection scope of the embodiments of the present application. Embodiments of the present application include at least some of the following.

Fig. 1 is a schematic diagram of a communication system to which embodiments of the present application are applicable. The transmission resources of the in-vehicle terminals (in-vehicle terminal 121 and in-vehicle terminal 122) are allocated by the base station 110, and the in-vehicle terminals transmit data on the side links according to the resources allocated by the base station 110. Specifically, the base station 110 may allocate resources for single transmission to the terminal, or may allocate resources for semi-static transmission to the terminal.

Fig. 2 is a schematic diagram of another communication system to which embodiments of the present application are applicable. The vehicle-mounted terminals (the vehicle-mounted terminal 131 and the vehicle-mounted terminal 132) autonomously select transmission resources on the resources of the side links to perform data transmission. Optionally, the vehicle-mounted terminal may select the transmission resource randomly, or select the transmission resource by listening.

In the side line communication, according to the network coverage condition of the terminal for communication, the side line communication may be classified into the network coverage inside line communication, as shown in fig. 3; partial network coverage side traffic as shown in fig. 4; and network overlay outside line communications, as shown in fig. 5.

Fig. 3: in network coverage inside-side communication, all terminals performing side-side communication are in the coverage of the base station, so that the terminals can perform side-side communication based on the same side-side configuration by receiving the configuration signaling of the base station.

Fig. 4: under the condition that part of the network covers the side communication, part of terminals for performing the side communication are located in the coverage area of the base station, and the part of terminals can receive the configuration signaling of the base station and perform the side communication according to the configuration of the base station. And the terminal outside the network coverage area cannot receive the configuration signaling of the base station, in this case, the terminal outside the network coverage area determines the sidestream configuration according to the pre-configuration information and the information carried in the physical sidestream broadcast channel (Physical Sidelink Broadcast Channel, PSBCH) sent by the terminal inside the network coverage area, so as to perform sidestream communication.

Fig. 5: for network coverage outside line communication, all terminals for carrying out outside line communication are located outside the network coverage, and all terminals determine the outside line configuration according to pre-configuration information to carry out the outside line communication.

Fig. 6: for side-by-side communication with a central control node, a plurality of terminals form a communication group, the communication group having a central control node, also called a Cluster head terminal (CH), the central control node having one of the following functions: is responsible for the establishment of a communication group; joining and leaving of group members; performing resource coordination, distributing side transmission resources for other terminals, and receiving side feedback information of other terminals; and performing resource coordination and other functions with other communication groups.

It should be noted that, the Device-to-Device communication is based on a Side Link (SL) transmission technology of a Device-to-Device (D2D), and unlike a conventional cellular system in which communication data is received or transmitted through a base station, the internet of vehicles system adopts a direct terminal-to-terminal communication method, so that the system has higher spectral efficiency and lower transmission delay. Two transmission modes are defined in 3GPP, denoted as: a first mode (sidelink resource allocation mode 1) and a second mode (sidelink resource allocation mode 2).

First mode: the transmission resources of the terminal are allocated by the base station, and the terminal transmits data on the side links according to the resources allocated by the base station; the base station may allocate resources for single transmission to the terminal, or may allocate resources for semi-static transmission to the terminal. As shown in fig. 3, the terminal is located in the coverage area of the network, and the network allocates transmission resources for side transmission to the terminal.

Second mode: and the terminal selects one resource from the resource pool to transmit data. As shown in fig. 5, the terminal is located outside the coverage area of the cell, and autonomously selects transmission resources in a preconfigured resource pool to perform side transmission; or as shown in fig. 3, the terminal autonomously selects transmission resources from a resource pool configured by the network to perform side transmission.

In New air-interface-vehicle to other devices (New Radio-Vehicle to Everything, NR-V2X), autopilot is supported, thus placing higher demands on data interaction between vehicles, such as higher throughput, lower latency, higher reliability, greater coverage, more flexible resource allocation, etc.

In LTE-V2X, a broadcast transmission scheme is supported, and in NR-V2X, unicast and multicast transmission schemes are introduced. For unicast transmission, the receiving terminal has only one terminal, as shown in fig. 7, and unicast transmission is performed between UE1 and UE 2; for multicast transmission, the receiving end is all terminals in a communication group or all terminals in a certain transmission distance, as shown in fig. 8, UE1, UE2, UE3 and UE4 form a communication group, wherein UE1 sends data, and other terminal devices in the group are all receiving end terminals; for the broadcast transmission mode, the receiving end is any one of the terminals around the transmitting end terminal, as shown in fig. 9, UE1 is the transmitting end terminal, and the other terminals around it, UE2 to UE6 are all receiving end terminals.

For a better understanding of the embodiments of the present application, the frame structure of the NR-V2X system relevant to the present application will be described.

As shown in fig. 10, which shows a slot structure in NR-V2X, fig. 10 (a) shows a slot structure in which a physical sidelink feedback channel (Physical Sidelink Feedback Channel, PSFCH) is not included in a slot; the diagram (b) in fig. 10 shows a slot structure including the PSFCH.

The physical sidelink control channel (Physical Sidelink Control Channel, PSCCH) in NR-V2X occupies 2 or 3 orthogonal frequency division multiplexing (Orthogonal frequency-division multiplexing, OFDM) symbols from the second sidelink symbol of the slot in the time domain and may occupy {10,12, 15,20,25} physical resource blocks (physical resource block, PRBs) in the frequency domain. To reduce the complexity of blind detection of PSCCH by a UE, only one PSCCH symbol number and PRB number are allowed to be configured in one resource pool. In addition, because the sub-channel is the minimum granularity of the physical sidelink shared channel (Physical Sidelink Shared Channel, PSSCH) resource allocation in NR-V2X, the number of PRBs occupied by the PSCCH must be less than or equal to the number of PRBs contained in one sub-channel in the resource pool, so as not to cause additional restrictions on PSSCH resource selection or allocation. The PSSCH also starts in the time domain from the second side symbol of the slot, the last time domain symbol in the slot being a Guard Period (GP) symbol, the remaining symbols mapping the PSSCH. The first side symbol in the slot is a repetition of the second side symbol, and typically the receiving end terminal uses the first side symbol as an automatic gain control (Auto gain control, AGC) symbol, the data on which is not typically used for data demodulation. The PSSCH occupies M subchannels in the frequency domain, each comprising N consecutive PRBs. As shown in fig. 10 (a).

When a PSFCH channel is included in a slot, the penultimate symbol and the third last symbol in the slot are used for PSFCH channel transmission, and the data on the third last symbol is a repetition of the data on the second last symbol, and one time-domain symbol before the PSFCH channel is used as a GP symbol, as shown in (b) of fig. 10.

To facilitate a better understanding of embodiments of the present application, a side-by-Side (SL) CSI-RS related to the present application is described.

SL CSI-RS is supported in NR-V2X, which can be sent when the following 3 conditions are met:

the UE transmits the corresponding PSSCH, that is, the UE cannot transmit only the SL CSI-RS;

the high-layer signaling activates the reporting of the sidestream channel state information (Channel State Information, CSI);

under the condition that the high-layer signaling activates the sidelink CSI reporting, the corresponding bit in the second-order SCI sent by the UE triggers the sidelink CSI reporting.

The maximum port number supported by the SL CSI-RS is 2, the SL CSI-RSs of different ports in two ports are multiplexed on two adjacent Resource Elements (REs) of the same orthogonal frequency division multiplexing (Orthogonal frequency-division multiplexing, OFDM) symbol in a code division mode, and the average number of REs occupied by the SLCSI-RSs of each port in one PRB is 1, namely the density is 1. Therefore, the SL CSI-RS will only appear on one OFDM symbol at most within one PRB, and the specific position of this OFDM symbol is determined by the transmitting terminal. The position of the OFDM symbol where the SL CSI-RS is located is indicated by a sidelink CSI-RS first symbol (SL-CSI-RS-first symbol) parameter in the PC 5-radio resource control (Radio Resource Control, RRC).

The position of the first RE occupied by the SL CSI-RS in one PRB is indicated by a side-row CSI-RS frequency domain allocation (SL-CSI-RS-FreqAllocation) parameter in the PC5-RRC, and if the SL CSI-RS is a port, the parameter is a bit map with the length of 12, and the bit map corresponds to 12 REs in one PRB. If the SL CSI-RS is two ports, the parameter is a bit map of length 6, in which case the SL CSI-RS occupies two REs of 2f (1) and 2f (1) +1, where f (1) represents the index of the bit of value 1 in the bit map. The frequency domain position of the SL CSI-RS is also determined by the transmitting terminal, but the determined frequency domain position of the SL CSI-RS cannot collide with the phase tracking reference signal (Phase Tracking Reference Signal, PT-RS). FIG. 11 shows a time-frequency position of a SL CSI-RS, in FIG. 11, the number of SL CSI-RS ports is 2, SL-CSI-RS-FirstSymbol is 8, SL-CSI-RS-FreqAllocation is [ b ] ₅ ,b ₄ ,b ₃ ,b ₂ ,b ₁ ,b ₀ ]＝[0,0,0,1,0,0]That is, f (1) =2, 2f (1) =4, and 2f (1) +1=5, and sl CSI-RS occupies re#4 and re#5.

For a better understanding of embodiments of the present application, a multi-beam system related to the present application is described.

Design goals for NR or 5G systems include large bandwidth communications in the high frequency band (e.g., the frequency band above 6 GHz). As the operating frequency becomes higher, the path loss during transmission increases, thereby affecting the coverage capability of the high frequency system. In order to effectively ensure the coverage of the high-frequency range NR system, an effective technical scheme is based on a large-scale antenna array (Massive MIMO) to form a shaped beam with larger gain, overcome propagation loss and ensure the coverage of the system.

The millimeter wave antenna array has the advantages that due to the fact that the wavelength is shorter, the antenna array interval and the aperture are smaller, more physical antenna arrays can be integrated in a two-dimensional antenna array with a limited size, meanwhile, due to the fact that the size of the millimeter wave antenna array is limited, a digital wave beam forming mode cannot be adopted in consideration of factors such as hardware complexity, cost overhead and power consumption, an analog wave beam forming mode is adopted generally, network coverage is enhanced, and meanwhile the realization complexity of equipment can be reduced.

One cell (sector) uses one wider beam (beam) to cover the entire cell. At each instant, therefore, the terminal devices within the coverage area of the cell have an opportunity to acquire the transmission resources allocated by the system.

NR/5G Multi-beam (Multi-beam) systems cover the whole cell by different beams, i.e. each beam covers a small range, with scanning (sweep) over time to achieve the effect of multiple beams covering the whole cell.

Fig. 12 shows a schematic diagram without beamforming and with a beamforming system. Fig. 12 (a) is a conventional LTE and NR system that does not use beamforming, and fig. 12 (b) is a NR system that uses beamforming:

In fig. 12 (a), the LTE/NR network side uses one wide beam to cover the entire cell, and the users 1-5 can receive the network signal at any time.

In contrast, in fig. 12 (b), the network side uses a narrower beam (e.g., beams 1-4 in the figure), and uses different beams at different times to cover different areas in the cell, e.g., at time 1, the nr network side covers the area where user 1 is located by beam 1; at time 2, the NR network side covers the area where the user 2 is located through the beam 2; at time 3, the NR network side covers the areas where the users 3 and 4 are located through the beam 3; at time 4, the nr network side covers the area where the user 5 is located by the beam 4.

In fig. 12 (b), since the network uses narrower beams, the transmitted energy can be more concentrated and thus can cover greater distances; also, because the beams are narrow, each beam can only cover a partial area in the cell, so analog beamforming is "space-time".

Analog beamforming can be used not only for network side devices but also for terminals as well. Meanwhile, analog beamforming may be used not only for transmission of signals (referred to as a transmission beam) but also for reception of signals (referred to as a reception beam).

Different beams (beams) are identified by the different signals carried thereon.

Different synchronization signal blocks (Synchronization Signal block, SS blocks) are transmitted on different beams (beams), which can be distinguished by the terminal device.

Different channel state information reference signals (Channel State Information Reference Signal, CSI-RS) are transmitted on different beams (beams), which are identified by the terminal device through CSI-RS signals/CSI-RS resources.

In a multi-beam (multi-beam) system, the physical downlink control channel (Physical Downlink Control Channel, PDCCH) and the physical downlink shared channel (Physical Downlink Shared Channel, PDSCH) may be transmitted by different downlink transmit beams.

For systems with carrier frequencies below 6GHz, the terminal side typically has no analog beam, and therefore uses an omni-directional antenna (or a near-omni-directional antenna) to receive signals transmitted by different downlink transmit beams of the base station.

For millimeter wave systems, there may be an analog beam at the terminal side, and a corresponding downlink receiving beam needs to be used to receive a signal sent by a corresponding downlink sending beam. At this time, corresponding beam indication information (beam indication) is needed to assist the terminal device in determining the transmission beam related information of the network side or the corresponding reception beam related information of the terminal side.

In the NR protocol, the beam indication information does not directly indicate the beam itself, but indicates by a Quasi co-located (QCL) hypothesis (e.g., QCL hypothesis with QCL type "QCL-type") between signals. At the terminal side, the statistical characteristics of the received corresponding channels/signals are determined, also based on QCL quasi co-sited hypotheses.

To facilitate a better understanding of the embodiments of the present application, QCL quasi co-location indication/assumption for downstream transmissions related to the present application will be described.

In order to improve the reception performance when the terminal receives a signal, the terminal may improve the reception algorithm by using the characteristics of the transmission environment corresponding to the data transmission. The statistical properties of the channel may be used, for example, to optimize the design and parameters of the channel estimator. In the NR system, these characteristics corresponding to data transmission are represented by QCL state (QCL-Info).

Downlink transmission if the downlink transmission is from different transmission receiving points (Transmission Reception Point, TRP)/antenna array block (panel)/beam (beam), the characteristics of the transmission environment corresponding to the data transmission may also change, so in the NR system, the network side transmits the downlink control channel or the data channel, and indicates the corresponding QCL state information to the terminal through the transmission configuration indication (Transmission Configuration Indicator, TCI) state.

One TCI state may include the following configuration:

a TCI state Identification (ID) for identifying a TCI state;

QCL information 1;

QCL information 2 (optional).

Wherein, one QCL information further comprises the following information:

the QCL Type (Type) configuration may be one of QCL-Type A, QCL-Type B, QCL-Type C or QCL-Type D;

the QCL reference signal configuration includes a cell Identification (ID) where the reference signal is located, a bandwidth Part (BWP) Identification (ID), and an identification of the reference signal (which may be a CSI-RS resource identification or a synchronization signal block index).

Wherein, if both QCL information 1 and QCL information 2 are configured, the QCL Type of at least one QCL information must be one of QCL-Type a, QCL-Type b, and QCL-Type c, and the QCL Type of the other QCL information must be QCL-Type D.

Wherein, the definition of different QCL type configurations is as follows:

'QCL-TypeA': doppler shift (Doppler shift), doppler spread (Doppler spread), average delay (average delay), delay spread (delay spread) };

'QCL-TypeB': { Doppler shift (Doppler shift), doppler spread (Doppler spread) };

'QCL-TypeC': { Doppler shift (Doppler shift), average delay (average delay) };

'QCL-TypeD': spatial reception parameters (Spatial Rx parameter).

In an NR system, the network side may indicate a corresponding TCI state for a downlink signal or a downlink channel.

If the network side configures the QCL reference signal of the target downlink channel or the target downlink signal to be the reference SSB or the reference CSI-RS resource through the TCI state and the QCL type is configured to be TypeA, typeB or TypeC, the terminal may assume that the large-scale parameters of the target downlink signal and the reference SSB or the reference CSI-RS resource are the same, and the large-scale parameters are determined through QCL type configuration.

Similarly, if the network side configures the QCL reference signal of the target downlink channel or downlink signal to be the reference SSB or the reference CSI-RS resource through the TCI state and the QCL type is configured to be TypeD, the terminal may receive the target downlink channel or the target downlink signal by using the same receiving beam (i.e. Spatial Rx parameter) as that used for receiving the reference SSB or the reference CSI-RS resource. In general, the target downlink channel (or downlink signal) and its reference SSB or reference CSI-RS resource are transmitted by the same TRP or the same panel or the same beam on the network side. If the transmission TRP or transmission panel or transmission beam of the two downlink signals or downlink channels are different, different TCI states are typically configured.

For the downlink control channel, the TCI state of the corresponding control resource set (Control Resource Set, CORESET) may be indicated by means of radio resource control (Radio Resource Control, RRC) signaling or RRC signaling + medium access control (Media Access Control, MAC) signaling.

For the downlink data channel, the available set of TCI states is indicated by RRC signaling, part of the TCI states are activated by MAC layer signaling, and finally one or two TCI states are indicated from the activated TCI states by a TCI state indication field in the downlink control information (Downlink Control Information, DCI) for the PDSCH scheduled by the DCI. The case of 2 TCI states is mainly for multiple TRP-like scenarios. For example, as shown in fig. 13, the network device indicates N candidate TCI states through RRC signaling, activates K TCI states through MAC signaling, and finally indicates 1 or 2 used TCI states from among the activated TCI states through a TCI state indication field in DCI.

In order to facilitate better understanding of the embodiments of the present application, technical problems that exist in the present application are described.

The millimeter wave frequency band can be used in the sidestream transmission system to improve the transmission rate of the sidestream communication system, and in sidestream millimeter wave transmission, the transmitting end needs to transmit the CSI-RS to determine an optimal airspace transmitting filter of the transmitting end and/or determine an optimal airspace receiving filter of the receiving end. However, how to configure CSI-RS resources for transmitting CSI-RS specifically to select an optimal spatial transmit filter (transmit beam) or an optimal spatial receive filter (receive beam) based on the transmitted CSI-RS is a problem to be solved.

If only one CSI-RS is transmitted in one time slot, one time slot is required for each CSI-RS to be transmitted, and each CSI-RS needs to be transmitted together with the PSSCH, multiple CSI-RS need to be transmitted in determining a spatial transmit filter (transmit beam) or a spatial receive filter (receive beam), which may result in a larger transmission delay. In the selection process of the airspace transmitting filter and the airspace receiving filter, the transmitting end and the receiving end do not determine the optimal airspace transmitting filter and the airspace receiving filter, so normal data transmission is not usually carried out, and therefore PSSCH transmitted in the selection process of the airspace transmitting filter and the airspace receiving filter usually does not bear normal sidestream data, but only redundant bits, filling bits and the like are filled, and the transmission efficiency is reduced.

In addition, when the transmitting end works in mode 2 (i.e. the second mode), the transmitting end determines the transmission resource based on interception, and because mechanisms such as re-evaluation (re-evaluation) and pre-preemption (pre-preemption) may cause the transmitting end to perform resource reselection, the receiving end cannot accurately know the resource of the transmitting end for transmitting the CSI-RS, and in the process of determining the spatial receiving filter, the receiving end needs to use different spatial receiving filters to respectively receive the CSI-RS transmitted by the transmitting end, so that the receiving end needs to accurately know the resource position occupied by the CSI-RS transmitted by the transmitting end.

Based on the above problems, the present application proposes a scheme for transmitting a side-row CSI-RS, where a transmitting end uses a spatial domain transmission filter to transmit M CSI-RS to a receiving end, and one CSI-RS of the M CSI-RS occupies the last-to-last time-domain symbol and the last-to-last time-domain symbol in time-domain symbols available for side-row transmission in one slot, that is, in the embodiment of the present application, the last-to-last time-domain symbol and the last-to-last-third time-domain symbol in the time-slot occupied by the CSI-RS are configured, so that the CSI-RS and the PSCCH or the PSSCH are not transmitted simultaneously, and the transmission efficiency of the CSI-RS is optimized. In addition, the receiving end can determine the time slot positions of the plurality of subsequent CSI-RSs based on the time slot of the first CSI-RS, so that corresponding receiving beams can be determined in advance and received.

The technical scheme of the present application is described in detail below through specific embodiments.

Fig. 14 is a schematic flow chart of a method 200 of wireless communication according to an embodiment of the present application, as shown in fig. 14, the method 200 of wireless communication may include at least some of the following:

s210, a first terminal device sends M CSI-RSs to a second terminal device by using a spatial domain sending filter; one of the M CSI-RSs occupies the last but one time domain symbol and the last but one time domain symbol in time domain symbols which can be used for side line transmission in one time slot, the M CSI-RSs are used for selecting a target space domain transmitting filter, or the M CSI-RSs are used for selecting a target space domain receiving filter, and M is a positive integer;

S220, the second terminal equipment receives the M CSI-RSs sent by the first terminal equipment by using a spatial domain sending filter.

In this embodiment of the present application, the first terminal device is a transmitting end device, and the second terminal device is a receiving end device.

In the embodiment of the application, the optimal spatial domain transmitting filter of the first terminal device may be selected based on the CSI-RS transmitted by the first terminal device, or the optimal spatial domain receiving filter of the second terminal device may be selected based on the CSI-RS transmitted by the first terminal device.

In some embodiments, in determining an optimal transmission beam (optimal spatial domain transmission filter) of a transmitting end, for example, the transmitting end uses different beams to transmit CSI-RS in turn, a receiving end uses the same reception beam to respectively receive multiple CSI-RS transmitted by the transmitting end, measures the detected CSI-RS, selects a CSI-RS with an optimal measurement result, and feeds back corresponding resource information (such as a CSI-RS resource index or timeslot information corresponding to the CSI-RS) to the transmitting end, where the transmission beam corresponding to the CSI-RS resource is the transmission beam optimal for the receiving end.

In some embodiments, in determining an optimal receiving beam (optimal spatial receiving filter) of a receiving end, for example, a transmitting end uses the same beam to transmit CSI-RS, preferably, the transmitting end uses a transmitting beam optimal for the receiving end to transmit CSI-RS, the receiving end uses different receiving beams to receive CSI-RS transmitted by the transmitting end in turn, and performs measurement, and a beam corresponding to the receiving beam with an optimal measurement result is selected as an optimal beam of the receiving end. When the transmitting end uses the optimal transmitting beam to perform side transmission, the receiving end can use the optimal receiving beam corresponding to the transmitting end to perform corresponding receiving. Alternatively, the transmitting end adopts the above-mentioned process for different transmitting beams, respectively, and may determine the optimal receiving beam corresponding to each transmitting beam, respectively. Therefore, when the transmitting end is transmitting in the side line, the transmitting end can instruct the transmitting beam used in the side line transmission, and the receiving end can determine the optimal receiving beam corresponding to the transmitting beam and utilize the optimal receiving beam to perform side line receiving.

In the embodiment of the present application, in order to improve the transmission rate of the sidestream communication system, a millimeter wave band is used in the sidestream communication system, and in sidestream millimeter wave transmission, a transmitting end generally uses a beamforming (beamforming) manner to perform sidestream transmission.

In some embodiments, the Spatial transmit filter (Spatial domain transmission filter) may also be referred to as a transmit beam (transmit beam) or Spatial relationship (Spatial correlation) or Spatial configuration (Spatial transmission) or Spatial transmit parameters (Spatial transmit parameters).

In some embodiments, the spatial receive filter (spatial domain receive filter) may also be referred to as a receive beam (receptionbeam) or spatial receive parameter (spatial RXParameter).

In some embodiments, the spatial transmit filter and the spatial receive filter are collectively referred to as a spatial filter, which may also be referred to as a transmit-side spatial filter, and the spatial receive filter may also be referred to as a receive-side spatial filter or a receive beam.

In the embodiment of the present application, the "time slot" may also be other time units, such as micro time slots, frames, subframes, time domain symbols, absolute time, and relative time. Similarly, in the embodiments of the present application, the "time domain symbol" may be other time units, such as a minislot, a frame, a subframe, a slot, an absolute time, and a relative time. The present application is not limited in this regard.

In some embodiments, a CSI-RS of the M CSI-RS is a sidelink CSI-RS.

In some embodiments, in the above S210, "transmitting M CSI-RS" may also be expressed as "transmitting M CSI-RS resources", which is not limited in this application. That is, in the embodiment of the present application, the first terminal device transmitting CSI-RS may also be expressed as the first terminal device transmitting CSI-RS resources, that is, both are equivalent expressions. Similarly, the measurement result of the CSI-RS is equivalent to the measurement result of the CSI-RS resource.

In some embodiments, the value of M when the M CSI-RSs are used to select the target spatial transmit filter may be the same as or different from the value of M when the M CSI-RSs are used to select the target spatial receive filter, which is not limited in this application.

In some embodiments, the first terminal device transmitting M CSI-RSs to the second terminal device using the spatial transmit filter may refer to: the first terminal device uses different spatial domain transmission filters to transmit the M CSI-RS, for example, the M CSI-RS respectively correspond to the different spatial domain transmission filters; alternatively, instead of using the same spatial transmit filter to transmit the M CSI-RSs, the first terminal device may transmit the M CSI-RSs using at least two different spatial transmit filters, for example.

As an example, in S210 above, the first terminal device sends M CSI-RS to the second terminal device using M different spatial transmission filters, where each spatial transmission filter corresponds to one CSI-RS.

As an example, in S210 above, the first terminal device transmits M CSI-RSs to the second terminal device using K spatial transmission filters, where K is smaller than M and K is greater than 1, that is, at least two CSI-RSs among the M CSI-RSs are transmitted through different spatial transmission filters.

In some embodiments, in a case where the M CSI-RSs are used to select the target spatial domain transmission filter, a first value is taken by a corresponding repetition (repetition) field in the CSI-RS resource or the configuration information of the CSI-RS resource set corresponding to the M CSI-RSs, where the first value is used to indicate that the first terminal device does not use the same spatial domain transmission filter to transmit the CSI-RS. In other words, the first value is used to instruct the first terminal device to transmit CSI-RS using a different spatial transmit filter.

In some embodiments, the first value may be off (off), indicating that the M CSI-RSs transmitted by the first terminal device are used to select a target spatial domain transmit filter.

In some embodiments, when the M CSI-RS are used to select the target spatial domain receiving filter, the corresponding repetition field in the configuration information of the CSI-RS resource or the CSI-RS resource set corresponding to the M CSI-RS takes a second value, where the second value is used to instruct the first terminal device to send the CSI-RS using the same spatial domain sending filter.

In some embodiments, the second value may be on (on), indicating that the M CSI-RSs transmitted by the first terminal device are used to select a target spatial domain receive filter.

In some embodiments, the penultimate time domain symbol is a time domain symbol occupied by the CSI-RS.

In some embodiments, the data on the third-last time domain symbol is a repetition of the data on the second-last time domain symbol, or the data on the third-last time domain symbol is the same as the data on the second-last time domain symbol. For example, the third last time domain symbol is an AGC symbol.

In some embodiments, the third last time domain symbol is a time domain symbol occupied by CSI-RS.

In some embodiments, the data on the second-to-last time domain symbol is a repetition of the data on the third-to-last time domain symbol, or the data on the third-to-last time domain symbol is the same as the data on the second-to-last time domain symbol. For example, the third last time domain symbol is an AGC symbol.

In some embodiments, one time domain symbol before the third last time domain symbol is a GP symbol and/or one time domain symbol after the second last time domain symbol is a GP symbol.

Specifically, for example, as shown in fig. 15, in one slot, a second last time domain symbol and a third last time domain symbol are used for transmitting CSI-RS, where a time domain symbol before the third last time domain symbol is a GP symbol, and a time domain symbol after the second last time domain symbol is a GP symbol. In some embodiments, the terminal transmitting the PSCCH and/or PSSCH in one slot may be a different terminal than the terminal transmitting the CSI-RS. It should be understood that the slot structure including CSI-RS resources is only given as an example in fig. 15, and the relationship between CSI-RS resources and PSCCHs, PSSCHs in the frequency domain is not embodied.

Specifically, for example, when only a part of the time domain symbols in one slot are available for sidelink transmission, the CSI-RS occupies the second last time domain symbol and the third last time domain symbol in the time domain symbols available for sidelink transmission, as shown in fig. 16, the last 3 time domain symbols in the slot are not available for sidelink transmission, and the remaining 11 time domain symbols can be used for sidelink transmission.

In some embodiments, the first terminal device determines CSI-RS resources or CSI-RS resource sets corresponding to the M CSI-RS according to CSI-RS resource configuration information.

In some embodiments, the CSI-RS resource configuration information may include part or all of the CSI-RS resource configuration information in the resource pool configuration information or the side BWP configuration information, or the CSI-RS resource configuration information may be determined based on the CSI-RS resource configuration information in the resource pool configuration information or the side BWP configuration information, or the CSI-RS resource configuration information may be obtained from the CSI-RS resource configuration information in the resource pool configuration information or the side BWP configuration information.

In some embodiments, the first terminal device may send the CSI-RS resource configuration information to the second terminal device, so that the second terminal device may determine CSI-RS resources or CSI-RS resource sets corresponding to the M CSI-RS based on the CSI-RS resource configuration information.

In some embodiments, the CSI-RS resource configuration information includes, but is not limited to, at least one of:

the method comprises the steps of periodicity of CSI-RS resources, time slot offset of the CSI-RS resources, minimum time interval, time interval of two adjacent CSI-RSs, indication information of frequency domain resources which can be used for transmitting the CSI-RSs, frequency domain resources which are included by each CSI-RS resource, minimum frequency domain resource size which is included by each CSI-RS resource, interval of adjacent PRBs (physical resource blocks) of the mapping CSI-RSs, indication information of frequency domain positions of the CSI-RSs in one PRB, CSI-RS density, indication information of the quantity of the CSI-RSs which are multiplexed in a code division multiplexing (code division multiplexing, CDM) mode, code division multiplexing type and scrambling code identification.

In some embodiments, the period of the CSI-RS resource included in the CSI-RS resource configuration information may be represented by a number of slots. Specifically, for example, the period of the CSI-RS resource is P, which means that one time slot for transmitting the CSI-RS is included in every P time slots, or that there is one time slot including the CSI-RS in every P time slots. For example, p= {1,2,4,8}, i.e. means that one slot for transmitting CSI-RS is included every 1/2/4/8 slots.

In some embodiments, the slot offset of the CSI-RS resource included in the CSI-RS resource configuration information may be represented by a slot number. Specifically, for example, the slot offset of the CSI-RS resource represents a slot offset of a first slot including the CSI-RS relative to a first time domain location, wherein the first time domain location includes a first slot in SFN #0 or a first slot in DFN # 0. For example, the slot offset of the CSI-RS resource is 2 slots, and when p=4, i.e. there is one slot including the CSI-RS in every 4 slots, the first slot including the CSI-RS is located in slot 2 in one SFN period.

In some embodiments, the minimum time interval included in the CSI-RS resource allocation information may be represented by the number of slots. Specifically, for example, the minimum time interval represents a minimum time interval between the CSI-RS and first indication information associated with the CSI-RS, where the first indication information is used to instruct the first terminal device to send the CSI-RS, or the first indication information is used to instruct the first terminal device to send the CSI-RS. In particular, for another example, the minimum time interval represents a minimum time interval between a CSI-RS and its associated SCI or PSCCH, where the SCI or PSCCH is used to indicate transmission of the CSI-RS.

In some embodiments, if the first indication information is in the same slot as the first CSI-RS of the M CSI-RS, the minimum time interval is equal to 0. Or if the first indication information and the first CSI-RS in the M CSI-RS are in the same time slot, the minimum time interval is not included in the CSI-RS resource allocation information. That is, if the minimum time interval is not included in the CSI-RS resource allocation information, the default value is 0, that is, the first indication information and the first CSI-RS of the M CSI-RS are in the same time slot.

In some embodiments, the first indication information may be SCI.

Specifically, for example, the minimum time interval k=2, and the SCI is transmitted in the slot n, where the SCI instructs the first terminal device to transmit the CSI-RS, and the slot of the CSI-RS is the first slot in the resource pool located after the slot n+2 or the slot n+2, where the CSI-RS is included. As shown in fig. 17, the period of the CSI-RS resource is 2 slots, the minimum time interval k=2, when the SCI transmitted in slot 0 or slot 1 indicates that the CSI-RS are transmitted, the first CSI-RS thereof is located in slot 3, and similarly, when the SCI transmitted in slot 2/3 indicates that the CSI-RS are transmitted, the first CSI-RS thereof is located in slot 5, and so on. Optionally, the minimum time interval represents a minimum time interval between a first CSI-RS of the at least one CSI-RS associated with the SCI and a time slot in which the SCI is located.

In some embodiments, the time intervals of the adjacent two CSI-RS included in the CSI-RS resource configuration information are represented by a number of slots, or the time intervals of the adjacent two CSI-RS included in the CSI-RS resource configuration information are represented by a number of periods of CSI-RS resources.

In some embodiments, the time interval of the two adjacent CSI-RS is T, then t= {1,2,4,8} slots, or the period p=2 slots of the CSI-RS resource, then t= {1,2,3,4} CSI-RS resource periods.

Specifically, for example, the time interval t=4 slots of two adjacent CSI-RS resources sent by the sending end, sending an SCI indication to send 4 CSI-RS in the time slot n, where the determined first CSI-RS is located in the time slot n+2, and further, combining the time interval of the two adjacent CSI-RS, it can be determined that the time slots of the 4 CSI-RS are respectively: n+2; n+6; n+10; n+14.

Specifically, when the transmitting end indicates to transmit CSI-RS through SCI (or indication information), the transmitting end may transmit multiple CSI-RS in determining a spatial transmit filter (transmit beam) or a spatial receive filter (receive beam). The time domain position of the first CSI-RS can be determined by SCI (or indication information), and further, the time interval between two adjacent CSI-RS can be determined according to the time interval between the two adjacent CSI-RS, that is, the time domain positions of multiple CSI-RS can be determined.

In some embodiments, in a case where the time interval of the adjacent two CSI-RS is not included in the CSI-RS resource configuration information, the time interval of the adjacent two CSI-RS is a period of one CSI-RS resource. That is, the transmitting end transmits CSI-RS in consecutive CSI-RS resource periods, respectively. For example, the transmitting end does not configure a time interval between two adjacent CSI-RS, the period of the CSI-RS resource is 2 slots, sending SCI in slot n indicates to send 4 CSI-RS, and the determined first CSI-RS is located in slot n+2, and further, the slots of the 4 CSI-RS can be determined as follows: n+2; n+4; n+6; n+8.

It should be noted that, in the embodiment of the present application, the number of slots refers to the number of logical slots in the resource pool.

In some embodiments, the CSI-RS resource allocation information includes information of the frequency domain resource indication information available for transmitting CSI-RS resources for determining PRBs available for transmitting CSI-RS.

In some embodiments, the information of PRBs available for transmitting CSI-RS is indicated by a bit map, wherein each bit in the bit map corresponds to one PRB, and the length of the bit map is determined according to at least one of the following: the number of PRBs included in the sidelink carrier, the number of PRBs included in the sidelink BWP, and the number of PRBs included in the resource pool. For example, as shown in fig. 18, the system includes 30 PRBs, where PRB4, PRB9, PRB14, PRB19, PRB24, PRB29 have been allocated for PSFCH transmission, and the available PRBs for CSI-RS may be indicated by a bit bitmap of 30 bits, as shown in fig. 18, where bit bits in the bit bitmap take 0 to indicate PRBs for which CSI-RS are not available and bit bits in the bit bitmap take 1 to indicate PRBs for which CSI-RS are available, where the available PRBs for CSI-RS include PRB 0, PRB1, PRB2, PRB 5, PRB 6, PRB 7, PRB 10, PRB 11, PRB 12, PRB 15, PRB 16, PRB 17, PRB 20, PRB 21, PRB 22, PRB 25, PRB 26, PRB 27.

In some embodiments, the information of PRBs available for transmitting CSI-RS is determined by a starting frequency domain position and a frequency domain length available for transmitting CSI-RS.

In some embodiments, frequency domain resources included within the frequency domain resources determined based on the starting frequency domain position and the frequency domain length for transmitting the PSFCH and/or the sidelink positioning reference signal are not used for transmitting the CSI-RS.

In some embodiments, the frequency domain length is used to indicate the number of PRBs available for CSI-RS transmission.

Specifically, for example, the frequency domain resource indication information available for transmitting CSI-RS resources may indicate a frequency domain start position and a frequency domain length, respectively, or the frequency domain resource indication information available for transmitting CSI-RS resources may jointly indicate a frequency domain start position and a frequency domain length. For example, a resource indication value (resource indicator value, RIV) may be determined according to the frequency domain starting position and the frequency domain length, and the RIV value may be included in the frequency domain resource indication information that may be used to transmit the CSI-RS resource, and the corresponding frequency domain starting position and frequency domain length may be determined according to the RIV value.

In some embodiments, in case of frequency domain resources determined by a frequency domain start position and a frequency domain length, an end position of a frequency domain may be determined by the frequency domain start position and the frequency domain length, and if a PRB for transmitting a PSFCH is included between the frequency domain start position and the end position, the PRB for transmitting the PSFCH is not used for transmitting the CSI-RS; i.e. the PRBs used for transmitting CSI-RS do not comprise PRBs configured for transmitting PSFCH. As shown in fig. 19, the system includes 30 PRBs, where PRB4, PRB9, PRB14, PRB19, PRB24, and PRB29 are already allocated for PSFCH transmission, the starting PRB may be configured to be PRB6, and the frequency domain length is 10 PRBs, so the determined PRB range is PRB6 to PRB15, and since PRB9 and PRB14 are included for PSFCH transmission, the two PRBs (PRB 9 and PRB 14) cannot be used for transmitting CSI-RS, and the PRB that can be used for transmitting CSI-RS includes PRB with index {6,7,8,10,11,12,13,15 }.

In some embodiments, in the case of the frequency domain resource determined by the frequency domain starting position and the frequency domain length, the frequency domain length is used to indicate the total number of PRBs used for CSI-RS, if the PRB used for transmitting PSFCH is included in the process of determining the frequency domain resource of CSI-RS, the PRB used for transmitting PSFCH is skipped, and whether the next PRB is a PRB usable for CSI-RS is determined until the number of PRBs indicated by the frequency domain length is determined. As shown in fig. 20, the system includes 30 PRBs, where PRB4, PRB9, PRB14, PRB19, PRB24, PRB29 have been allocated for PSFCH transmission, then the starting PRB may be configured as PRB6, with a frequency domain length of 10 PRBs. The PRBs available for CSI-RS resources are determined starting from PRB6, where PRB9 and PRB14 are used for transmitting PSFCH, so these two PRBs (PRB 9 and PRB 14) cannot be used for transmitting CSI-RS resources, these two PRBs (PRB 9 and PRB 14) are skipped, and whether other PRBs are available is continuously determined, so the finally determined 10 PRBs available for transmitting CSI-RS include PRBs with index {6,7,8,10,11,12,13,1516,17 }.

In some embodiments, the frequency domain resources included by each CSI-RS resource included by the CSI-RS resource configuration information may be represented by a number of PRBs, e.g., each CSI-RS resource occupies 12 PRBs. Alternatively, the frequency domain resource included in each CSI-RS resource may be represented by the number of subchannels, e.g., each CSI-RS resource includes N subchannels, where the subchannels are granularity of PSSCH resource allocation, N being greater than or equal to 1; preferably, n=1.

In some embodiments, each CSI-RS resource includes frequency domain resources that may be represented by a number of PRBs available for CSI-RS transmission.

Alternatively, the frequency domain resource size determined according to the CSI-RS resource allocation information, which is available for CSI-RS transmission, should be divisible by the frequency domain resource size included in each CSI-RS. Therefore, the configured frequency domain resources which can be used for CSI-RS transmission can transmit an integral number of CSI-RSs, and the size of the frequency domain resources occupied by each CSI-RS is the same.

When the CSI-RS and the PSCCH/PSSCH are transmitted together, the frequency domain size occupied by the CSI-RS may be determined based on the frequency domain size of its associated PSSCH. In the embodiment of the present application, since the CSI-RS is not transmitted simultaneously with the PSCCH/psch, it is necessary to additionally determine the size of the frequency domain resources occupied by the CSI-RS.

In some embodiments, the CSI-RS resource allocation information includes an interval of adjacent PRBs of the mapped CSI-RS for determining an interval between two adjacent PRBs of the plurality of PRBs mapped by one CSI-RS, wherein the interval between the two adjacent PRBs is represented by a number of PRBs available for transmitting CSI-RS.

For example, one CSI-RS may not be mapped to all PRBs in the frequency domain resource occupied by the CSI-RS, and the interval of adjacent PRBs mapped to the CSI-RS may be indicated by configuration information. For example, the first PRB of the CSI-RS map is PRB2, and the interval of adjacent PRBs for mapping CSI-RS is 4 PRBs, and then CSI-RS map to PRB2, PRB6, PRB10, PRB14, and so on.

In some embodiments, one CSI-RS occupies adjacent PRBs available for CSI-RS transmission in case the interval of adjacent PRBs mapping CSI-RS is not included in the CSI-RS resource allocation information. When the interval of the adjacent PRBs for mapping the CSI-RS is not configured, the default value is 1 PRB, namely the CSI-RS occupies the adjacent PRBs which can be used for mapping the CSI-RS.

In some embodiments, the CSI-RS resource allocation information includes indication information of a frequency domain position of the CSI-RS resource within the one PRB for indicating the frequency domain position of the CSI-RS resource within the one PRB. For example, it may be indicated which REs are used for transmitting CSI-RS within one PRB. For example, REs that one PRB may be used for transmitting CSI-RS are indicated in the form of a bit map.

In some embodiments, the indication information of the frequency domain location of the CSI-RS resources within the one PRB is associated with the CSI-RS resource set, i.e. REs within the PRB occupied by all CSI-RS within the one CSI-RS resource set are the same.

It should be noted that, since different CSI-RS are transmitted in different time slots, only one CSI-RS is transmitted in one time slot, the resources of the CSI-RS may be distinguished by the time slot information where the CSI-RS are located, and at this time, REs occupied by all CSI-RS resources in one CSI-RS resource set in one PRB may be the same. In some embodiments, the M CSI-RSs transmitted by the first terminal device occupy the same REs within the PRB.

In some embodiments, the CSI-RS resource configuration information includes a CSI-RS density for indicating the number of REs occupied by CSI-RS of each CSI-RS port within each PRB. For example, the CSI-RS density is 2, which means that the CSI-RS of each antenna port occupies 2 REs within each PRB. When the CSI-RS density is less than 1, PRB information for mapping CSI-RS is further included. For example, the CSI-RS density is 0.5, that is, each antenna port occupies 1 RE in every 2 PRBs, and further, an indication information is further included to indicate PRB information for mapping CSI-RS in every 2 PRBs, for example, CSI-RS is mapped on odd (or even) PRBs.

In some embodiments, the indication information included in the CSI-RS resource configuration information for indicating the number of CSI-RS resources multiplexed by means of CDM may specifically indicate: for the same time-frequency resources, the number of CSI-RS resources may be multiplexed by code division.

In some embodiments, the CSI-RS resource allocation information includes a code division multiplexing type for determining a pattern of CSI-RS, i.e., a pattern of CSI-RS within one PRB.

In some embodiments, the code division multiplexing type includes: CDM, or CDM and Frequency Division Multiplexing (FDM).

Specifically, for example, multiple CSI-RS resources may be multiplexed in one PRB by CDM and/or FDM, and the multiplexing manner and/or multiplexing pattern of the multiple CSI-RS resources may be determined by the CSI-RS resource configuration information.

For example, FDM2 indicates that 2 CSI-RS may be multiplexed by FDM, specifically, 2 FDM multiplexed CSI-RS resources within one PRB occupy adjacent subcarriers or REs, where a subcarrier or RE occupied by one CSI-RS resource is determined according to a parameter side CSI-RS frequency domain allocation (sl-CSI-RS-FreqAllocation). For example, if the CSI-RS in the first CSI-RS resource is located at the subcarrier index 2 according to the sl-CSI-RS-FreqAllocation, the CSI-RS in the second CSI-RS resource is located at the subcarrier 3.

For another example, CDM2 means that 2 CSI-RS can be multiplexed by means of CDM, and specifically, 2 CDM-multiplexed CSI-RS resources within one PRB occupy the same subcarrier or RE, and the occupied subcarrier or RE is determined according to sl-CSI-RS-FreqAllocation. For example, if the CSI-RS in the first CSI-RS resource determined according to the sl-CSI-RS-FreqAllocation is located in the subcarrier indexes 2 and 3, the CSI-RS in the second CSI-RS resource is also located in the subcarriers 2 and 3, and the two CSI-RS are multiplexed by CDM.

In some embodiments, the CSI-RS resource configuration information includes the scrambling code identification used to generate the CSI-RS sequence. The CSI-RS sequence is generated from a Gold sequence, and the scrambling code identifies an initialization of the Gold sequence used to determine the CSI-RS sequence to generate.

For example, the CSI-RS sequence is generated by:

wherein the pseudo-random sequence c (n) is:

c(n)＝(x ₁ (n+N _C )+x ₂ (n+N _C ))mod 2

x ₁ (n+31)＝(x ₁ (n+3)+x ₁ (n))mod 2

x ₂ (n+31)＝(x ₂ (n+3)+x ₂ (n+2)+x ₂ (n+1)+x ₂ (n))mod 2

wherein N is _C =1600, first m sequence x ₁ Initialization parameter x of (n) ₁ (0)＝1,x ₁ (n) =0, n=1, 2,..30. Second m-sequence x ₂ (n) is expressed as

In some embodiments, c _init Determined from at least one of the following information:

time slot information associated with the CSI-RS;

time domain symbol information where the CSI-RS is located;

identification information n _ID 。

For example, the number of the cells to be processed,

the symbol indicates a slot number in a radio frame corresponding to a slot in which the CSI-RS is located, and l indicates an OFDM sequence number in the slot.

In some embodiments, n _ID Is determined by at least one of the following:

higher layer configuration parameters, namely scrambling code identification (scrambling id);

a CSI-RS resource set identifier;

CSI-RS resource identification;

CRC sequences generated based on SCI;

source identification information, such as the source identification information carried in SCI;

destination identification information, such as destination identification information carried in SCI; may be a receiving end identifier, a group identifier, an intra-group identifier of the terminal, etc.

In some embodiments, the CSI-RS resource configuration information further includes at least one of:

index of the CSI-RS resource corresponding to the M CSI-RS, index of the CSI-RS resource set corresponding to the M CSI-RS, corresponding relation between the CSI-RS resource set corresponding to the M CSI-RS and reporting amount of channel state information (Channel State Information, CSI), number of CSI-RS resources included in the CSI-RS resource set corresponding to the M CSI-RS, indication information for indicating a Quasi Co-Location (QCL) type, number of CSI-RS resources reported or fed back to the first terminal device by the second terminal device, and value of a corresponding repetition field in configuration information of the CSI-RS resource corresponding to the M CSI-RS or the CSI-RS resource set;

the first value is taken by a corresponding repeated field in the configuration information of the CSI-RS resources or the CSI-RS resource sets corresponding to the M CSI-RS, and is used for indicating that the first terminal device does not use the same spatial domain transmission filter to transmit the CSI-RS, and the second value is taken by a corresponding repeated field in the configuration information of the CSI-RS resources or the CSI-RS resource sets corresponding to the M CSI-RS, and is used for indicating that the first terminal device uses the same spatial domain transmission filter to transmit the CSI-RS.

In some embodiments, the indication information for indicating the QCL type is used to indicate the QCL type between CSI-RS resources in the CSI-RS resource set; alternatively, the indication information for indicating the QCL type is used to indicate whether the QCL-type relationship is TRUE (TRUE) or FALSE (FALSE). For example, the possible values of the indication information for indicating the QCL type include: { QCL-TypeA, QCL-TypeB, QCL-TypeC, QCL-TypeD }, when the value is QCL-TypeD, the relation that all the CSI-RS resources in the CSI-RS resource set have QCL-TypeD is indicated.

In some embodiments, the CSI reporting value is one of: CSI-RS resource indication (CSI-RS Resource Indicator, CRI), CRI and reference signal received power (Reference Signal Receiving Power, RSRP) ('CRI-RSRP'), CRI and signal to interference plus noise ratio (Signal to Interference plus Noise Ratio, SINR) ('CRI-SINR'), slot indication information and RSRP, slot indication information and SINR, no reporting or null ('none'). The time slot indication information is used for indicating the time slot where the CSI-RS is located. It should be understood that the CSI reporting amount refers to reporting by the second terminal to the first terminal.

In some embodiments, the CSI-RS resource configuration information includes: at least one parameter repetition (repetition) is set to a first set of CSI-RS resources that are off and/or at least one parameter repetition (repetition) is set to a second set of CSI-RS resources that are on. The first CSI-RS resource set is used for determining a spatial domain sending filter, and the second CSI-RS resource set is used for determining a spatial domain receiving filter.

For example, two CSI-RS resource sets are configured in the CSI-RS resource configuration information, where a repetition (repetition) field of the first CSI-RS resource set is off, and a repetition of the second CSI-RS resource set is on. When the transmitting end transmits the indication information to the receiving end to indicate that the CSI-RS resource set with the repetition (repetition) field being off is used, the receiving end can assume that the transmitting end uses different airspace transmission filters to transmit the CSI-RS, so that the receiving end can measure according to the CSI-RS and feed back the index and/or the measurement result of the preferable CSI-RS resource, and the transmitting end can determine the preferable transmitting airspace transmission filter; when the repetition field is on, the receiving end may assume that the transmitting end uses the same spatial domain transmitting filter to transmit the CSI-RS, so that the receiving end may use different receiving side-spatial domain receiving filters to respectively receive the CSI-RS, measure the CSI-RS, and select an optimal receiving side-spatial domain receiving filter according to the measurement result, thereby implementing a selection process of the receiving side-spatial domain receiving filter.

For another example, two sets of CSI-RS resources are configured in the CSI-RS resource configuration information, and the CSI reporting amount associated with the CSI-RS resource set is configured, the CSI reporting amount associated with the first set of CSI-RS resources is 'cri-RSRP', and the CSI reporting amount associated with the second set of CSI-RS resources is 'none'. When the transmitting end sends indication information to the receiving end to indicate that the CSI reporting amount is 'cri-RSRP', that is, the transmitting end will send CSI-RS resources in the first CSI-RS resource set, at this time, the receiving end can assume that the transmitting end uses different spatial domain transmission filters to send CSI-RS, so that the receiving end can measure according to the CSI-RS and feed back the preferred CSI-RS resource index and/or measurement result, thereby enabling the transmitting end to determine the preferred transmitting side spatial domain transmission filter; when the transmitting end sends the indication information to the receiving end to indicate that the CSI reporting amount is 'none', that is, the transmitting end will send the CSI-RS resources in the second CSI-RS resource set, at this time, the receiving end can assume that the transmitting end uses the same spatial domain transmitting filter to send the CSI-RS, so that the receiving end can use different receiving side spatial domain receiving filters to respectively receive the CSI-RS, measure the CSI-RS, and select an optimal receiving side spatial domain receiving filter according to the measurement result, thereby realizing a selection process of the receiving side spatial domain receiving filter.

In some embodiments, the CSI-RS resource configuration information includes one or more of the following parameters:

the number of antenna ports, for example, indicates that the CSI-RS antenna port number is {1,2,4,8}, etc.;

CSI-RS density.

In some embodiments, the CSI-RS density is used to indicate the number of REs occupied by CSI-RS per antenna port within each PRB. For example, the density is 2, which means that in each PRB, the CSI-RS of each antenna port occupies 2 REs.

In some embodiments, when the CSI-RS density is less than 1, the CSI-RS resource configuration information may further include PRB information for indicating that CSI-RS resources are mapped. For example, the CSI-RS resource allocation information may further include PRB information in which one CSI-RS resource is mapped every 2 PRBs, such as mapping CSI-RS resources on odd (or even) PRBs, when the density is 0.5, i.e., each antenna port occupies 1 RE every 2 PRBs.

In some embodiments, the purpose of the CSI-RS resource set may be indicated by a value of a repetition field of the CSI-RS resource set, for example, for determining a target transmit beam or for determining a target receive beam.

In some embodiments, the purpose of the CSI-RS resource set may be indicated by an index of the CSI-RS resource set, e.g., for determining a target transmit beam or for determining a target receive beam. The configuration information of the CSI-RS resource set comprises index information and repeated fields of the CSI-RS resource set. The corresponding CSI-RS resource set can be determined through the index of the CSI-RS resource set, and further, the value of the repeated field in the CSI-RS resource set can be determined.

For example, when determining the target transmit beam, the transmitting terminal may use the repetition of the CSI-RS resource set that is off, and when determining the target receive beam, the transmitting terminal may use the repetition of the CSI-RS resource set that is on.

In some embodiments, the resource pool configuration information or side-row BWP configuration information comprises configuration information of the first CSI-RS resource set and configuration information of the second CSI-RS resource set. Wherein the repetition of the first CSI-RS resource set is off and the repetition of the second CSI-RS resource set is on.

When the target transmission beam needs to be determined, the first terminal device indicates the index of the first CSI-RS resource set, or indicates to use the first CSI-RS resource set, for example, the first terminal device may use different transmission beams to respectively transmit M1 CSI-RS resources in the first CSI-RS resource set, the second terminal device respectively measures the received CSI-RS resources, and performs CSI reporting or feedback according to the measurement result, and the first terminal device performs selection of the target transmission beam according to CSI reporting or feedback of the second terminal device.

When determining the reception beam, the first terminal device indicates an index of the second CSI-RS resource set or indicates to use the second CSI-RS resource set. For example, the first terminal device uses the same transmitting beam to respectively transmit M2 CSI-RS resources in the second CSI-RS resource set, the second terminal device uses different receiving beams to respectively receive, measures the CSI-RS resources, and selects a target receiving beam according to a measurement result.

In other embodiments of the present application, the usage of the CSI-RS resource set may be indicated by the CSI reporting amount configuration corresponding to the CSI-RS resource set, for example, whether to determine the target transmit beam or the target receive beam. For example, when determining the target transmit beam, the transmitting terminal uses the CSI-RS resource set with the CSI reporting amount not being 'none', and when determining the target receive beam, the transmitting terminal uses the CSI-RS resource set with the CSI reporting amount being 'none'.

For example, the resource pool configuration information or the sidelink BWP configuration information configures two CSI-RS resource sets and configures a CSI reporting amount associated with the CSI-RS resource set, the CSI reporting amount associated with the first CSI-RS resource set being 'cri-RSRP', the CSI reporting amount associated with the second CSI-RS resource set being 'none'.

When the first terminal device indicates to the second terminal device that the CSI reporting amount is 'cri-RSRP', that is, indicates that the first terminal device will send CSI-RS resources in the first CSI-RS resource set, at this time, the second terminal device may assume that the first terminal device uses different transmission beams to send CSI-RS resources, so that the second terminal device measures the CSI-RS resources and performs CSI reporting or feedback, so that the first terminal device may determine a target transmission beam according to CSI reporting or feedback.

When the first terminal device indicates that the CSI reporting amount is 'none' to the second terminal device, that is, the first terminal device will send CSI-RS resources in the second CSI-RS resource set, at this time, the second terminal device may assume that the first terminal device uses the same transmission beam to send CSI-RS resources, so the second terminal device may use different reception beams to respectively receive CSI-RS resources, measure CSI-RS resources, and select a target reception beam according to a measurement result.

In this embodiment of the present application, the first terminal device and the second terminal device may both learn the resource pool configuration information or the side BWP configuration information. I.e. the first terminal device and the second terminal device are consistent with the understanding of the CSI-RS resource allocation information.

In some embodiments, CSI-RS resources within different time slots have the same frequency domain resources; and/or, the CSI-RS resources in different time slots have the same code domain resource; and/or, the CSI-RS resources in different slots have the same sequence.

In some embodiments, CSI-RS resources within different time slots have different frequency domain resources and/or CSI-RS resources within different time slots have different code domain resources and/or CSI-RS resources within different time slots have different sequences.

In some embodiments, the first terminal device sends second indication information to the second terminal device;

the second indication information is used for indicating that the CSI-RS sent by the first terminal equipment is used for selecting a space domain sending filter used for the first terminal equipment to send side data; or, the second indication information is used for indicating that the CSI-RS sent by the first terminal equipment is used for selecting an airspace receiving filter for the second terminal equipment to receive sidestream data; or, the second indication information is used for indicating that the CSI-RS sent by the first terminal device is used for measuring channel state information.

In some embodiments, the channel state information may include, but is not limited to, at least one of:

channel quality Indication (Channel Quantity Indicator, CQI), rank Indication (RI), precoding matrix Indication (Precoding Matrix Indicator, PMI).

In some embodiments, the second indication information is carried by one of:

PC5-RRC signaling, SCI, medium access control element (Media Access Control Control Element, MAC CE), sidestream feedback information.

In some embodiments, the first terminal device indicates to activate sidestream feedback when the second indication information is carried over SCI or MACCE.

In some embodiments, the sequence corresponding to one CSI-RS of the M CSI-RS is determined according to at least one of the following information:

CSI-RS resource set identification, CSI-RS resource identification, CRC sequence generated based on SCI, source identification information, destination identification information and scrambling code identification;

the SCI is associated with the CSI-RS, the source identification information is used for indicating terminal identification information for sending the CSI-RS, the destination identification information is used for indicating terminal identification information for receiving the CSI-RS, and the scrambling code identification is determined according to scrambling code identification information included in CSI-RS resource configuration information corresponding to the CSI-RS.

In some embodiments, the source identification information is determined from source identification information in the CSI-RS associated SCI and the destination identification information is determined from destination identification information in the CSI-RS associated SCI.

In the embodiment of the present application, in order to distinguish that CSI-RS resources transmitted in different time slots are different resources, CSI-RS resources may be distinguished by having at least one of different frequency domain resources (including different sets of CSI-RS resources, different PRBs, RE positions within different PRBs), different code domain resources, different sequences, and the like.

The schemes in the present application are described below by examples 1 and 2.

Embodiment 1, the CSI-RS resource configuration information includes the following parameters:

period P of CSI-RS resource: for example, p=1 slots;

slot offset t_offset of CSI-RS resources: for example, t_offset=0;

minimum time interval k: for example, k=2;

a time interval T_gap of two adjacent CSI-RSs transmitted by the first terminal equipment; for example, t_gap=2 slots.

In embodiment 1, the time domain resource of the CSI-RS resource set determined according to the above parameters is as shown in fig. 21, and the period p=1 of the CSI-RS resource indicates that each time slot includes the CSI-RS resource, and therefore, the corresponding t_offset=0; the parameter k=2 indicates a minimum time interval between a slot in which information indicating to transmit CSI-RS is carried and a slot in which a first CSI-RS is located, and if SCI transmitted in slot 2 is used to indicate to transmit CSI-RS and 4 CSI-RS are transmitted, the first CSI-RS is located in slot 4.T_gap represents the time interval between two adjacent CSI-RS transmitted by the first terminal device, and since t_gap=2 slots, the first CSI-RS is located in slot 4, and thus the subsequent CSI-RS are located in slots 6, 8 and 10, respectively. The second last time domain symbol of the time domain symbols available for side-line transmission in each slot is used for transmitting the CSI-RS, the data on the third last time domain symbol is a repetition of the data on the second last symbol, the third last time domain symbol may be an AGC symbol, and the first last individual time domain symbol and the fourth last time domain symbol are GP symbols.

Further, in embodiment 1, the CSI-RS resource allocation information further includes the following parameters:

indicating PRB (physical resource block) available for CSI-RS transmission by a bit bitmap according to frequency domain resource indication information of the CSI-RS resource;

the frequency domain resource n_rb occupied by each CSI-RS, for example, n_rb=6;

number of antenna ports (antanaport), e.g., antanaport=1;

bit bitmap [ b ] with 12-bit indication information (such as sl-CSI-RS-FreqAllocation) for indicating frequency domain position of CSI-RS resource in one PRB ₁₁ ,b ₁₀ ,b ₉ ,b ₈ ,b ₇ ,b ₆ ,b ₅ ,b ₄ ,b ₃ ,b ₂ ,b ₁ ,b ₀ ]＝[0,0,0,0,0,0,0,0,0,1,0,0]；

CSI-RS Density, e.g., density=1; i.e. it means that each antenna port occupies 1 RE within each PRB.

In embodiment 1, as shown in fig. 22, the system includes 30 PRBs, where PRB4, PRB9, PRB14, PRB19, PRB24, PRB29 have been allocated for PSFCH transmission, and the frequency domain resource indication information of the CSI-RS resources indicates the PRBs available for CSI-RS by a bitmap of 30 bits long, and as shown in fig. 22, a total of 18 PRBs are available for CSI-RS transmission. Since each CSI-RS includes 6 PRBs, 3 CSI-RS may be carried by a frequency division manner. Further, according to the parameter sl-CSI-RS-FreqAllocation, REs or subcarriers for carrying CSI-RS in the PRB of each CSI-RS may be determined.

for indicating the number cs_num of multiplexing CSI-RS resources by means of code division multiplexing; cs_num=2, i.e. means that 2 CSI-RS resources can be multiplexed by means of code division;

scrambling code identification (scrambling id): scramblingid=100.

In embodiment 1, as shown in fig. 22, since one CSI-RS resource occupies 6 PRBs, each PRB has one RE for mapping CSI-RS, and thus the length of the CSI-RS sequence is 6, 2 CSI-RS resources can be determined to be multiplexed by CDM according to the parameter cs_num, and the CSI-RS sequence is generated according to the scrambling code identification scramblingid=100.

Embodiment 2, the CSI-RS resource configuration information is used for configuring 2 CSI-RS resource sets, each CSI-RS resource set includes a plurality of CSI-RS resources, and specifically determines the configuration parameters of the CSI-RS resources, and further, the CSI-RS resource configuration information further includes the following configuration parameters:

CSI-RS resource set identification (CSI-RS-ResourceSetId): the identifications of the two CSI-RS resource sets are CSI-RS-resourceSID=0 and CSI-RS-resourceSID=1 respectively;

repetition (repetition); this parameter is set to off in the CSI-RS resource set identified as 0 and on in the CSI-RS resource set identified as 1.

In embodiment 2, each CSI-RS resource set is further configured with a CSI reporting configuration identity (CSI-ReportConfigId) associated therewith: for a CSI-RS resource set identified as 0, the CSI-ReportConfigId associated therewith is 'cir-RSRP'; for the CSI-RS resource set identified as 1, the CSI-ReportConfigId associated therewith is 'none'.

Therefore, in the embodiment of the present application, the first terminal device uses the spatial domain transmission filter to transmit M CSI-RSs to the second terminal device, and one CSI-RS of the M CSI-RSs occupies the second last time domain symbol and the third last time domain symbol in the time domain symbols available for side transmission in one slot, that is, by configuring the second last time domain symbol and the third last time domain symbol in the time slot occupied by the CSI-RS, the CSI-RSs are not transmitted simultaneously with the PSCCH or the PSSCH, so that the transmission efficiency of the CSI-RS is optimized. In addition, the second terminal device can determine the time slot positions of the plurality of subsequent CSI-RSs based on the time slot of the first CSI-RS, so that the corresponding spatial domain receiving filter can be determined in advance and received.

Further, in the embodiment of the present application, the first terminal device only needs to indicate the resource location occupied by the first CSI-RS, so that the resource locations occupied by all CSI-RS can be determined.

In some embodiments, the CSI-RS resources and the PSFCH resources may be multiplexed in the same time slot.

In some embodiments, the PSFCH resources are not included in the slots of the CSI-RS.

The method embodiments of the present application are described in detail above with reference to fig. 14 to 22, and the apparatus embodiments of the present application are described in detail below with reference to fig. 23 to 24, it being understood that the apparatus embodiments and the method embodiments correspond to each other, and similar descriptions may refer to the method embodiments.

Fig. 23 shows a schematic block diagram of a terminal device 300 according to an embodiment of the present application. The terminal device 300 is a first terminal device, as shown in fig. 23, and the terminal device 300 includes:

a communication unit 310, configured to send M CSI-RSs to the second terminal device using a spatial domain transmission filter;

In some embodiments, the data on the third-last time domain symbol is a repetition of, or the same as, the data on the second-last time domain symbol.

In some embodiments, one time domain symbol before the third last time domain symbol is a guard interval GP symbol and/or one time domain symbol after the second last time domain symbol is a GP symbol.

In some embodiments, the terminal device 300 further comprises: and a processing unit 320, where the processing unit 320 is configured to determine CSI-RS resources or CSI-RS resource sets corresponding to the M CSI-RS according to CSI-RS resource configuration information.

In some embodiments, the CSI-RS resource configuration information includes at least one of:

the method comprises the steps of periodicity of CSI-RS resources, time slot offset of the CSI-RS resources, minimum time interval, time interval of two adjacent CSI-RSs, indication information of frequency domain resources which can be used for transmitting the CSI-RSs, frequency domain resources which are included by each CSI-RS resource, minimum frequency domain resource size which is included by each CSI-RS resource, interval of adjacent Physical Resource Blocks (PRBs) of mapping the CSI-RSs, indication information of frequency domain positions of the CSI-RSs in one PRB, CSI-RS density, indication information of the number of the CSI-RSs which are multiplexed in a code division multiplexing mode, a code division multiplexing type and scrambling code identification.

In some embodiments, the slot offset of the CSI-RS resource represents a slot offset of a first slot including the CSI-RS relative to a first time domain location, wherein the first time domain location includes a first slot in SFN #0 or a first slot in DFN # 0.

In some embodiments, the minimum time interval represents a minimum time interval between a CSI-RS and first indication information associated therewith, the first indication information being used to instruct the first terminal device to transmit the CSI-RS.

In some embodiments, if the first indication information is in the same slot as the first CSI-RS of the M CSI-RS, the minimum time interval is equal to 0.

In some embodiments, the time interval of the adjacent two CSI-RS is represented by a number of slots, or the time interval of the adjacent two CSI-RS is represented by a number of periods of CSI-RS resources.

In some embodiments, in a case where the time interval of the adjacent two CSI-RS is not included in the CSI-RS resource configuration information, the time interval of the adjacent two CSI-RS is a period of one CSI-RS resource.

In some embodiments, the frequency domain resource indication information available for transmitting CSI-RS resources is used to determine information of PRBs available for transmitting CSI-RS.

In some embodiments, the information of PRBs available for transmitting CSI-RS is indicated by a bit map, wherein each bit in the bit map corresponds to one PRB, and the length of the bit map is determined according to at least one of the following: the number of PRBs included in the sidelink carrier, the number of PRBs included in the sidelink bandwidth part BWP, and the number of PRBs included in the resource pool.

In some embodiments, frequency domain resources included within the frequency domain resources determined based on the starting frequency domain location and the frequency domain length for transmitting the physical sidelink feedback channel PSFCH and/or the sidelink positioning reference signal are not used for transmitting the CSI-RS.

In some embodiments, the interval of adjacent PRBs for mapping CSI-RS is used to determine an interval between two adjacent PRBs among a plurality of PRBs for one CSI-RS mapping, wherein the interval between two adjacent PRBs is represented by the number of PRBs available for transmitting CSI-RS.

In some embodiments, one CSI-RS occupies adjacent PRBs available for CSI-RS transmission in case the interval of adjacent PRBs mapping CSI-RS is not included in the CSI-RS resource allocation information.

In some embodiments, the indication information of the frequency domain location of the CSI-RS resource within the one PRB is used to indicate the frequency domain location of the CSI-RS resource within the one PRB.

In some embodiments, the M CSI-RSs transmitted by the first terminal device occupy the same REs within a PRB.

In some embodiments, the code division multiplexing type includes: code division multiplexing CDM, or, CDM and frequency division multiplexing FDM.

In some embodiments, the scrambling code identification is used to generate CSI-RS sequences.

index of the CSI-RS resource corresponding to the M CSI-RS, index of the CSI-RS resource set corresponding to the M CSI-RS, corresponding relation between the CSI-RS resource set corresponding to the M CSI-RS and reporting amount of the channel state information CSI, number of CSI-RS resources included in the CSI-RS resource set corresponding to the M CSI-RS, indicating information of standard common site QCL type, number of CSI-RS resources reported or fed back to the first terminal device by the second terminal device, and value of corresponding repeated field in configuration information of the CSI-RS resource corresponding to the M CSI-RS or the CSI-RS resource set;

In some embodiments, when the M CSI-RS are used to select the target spatial domain transmission filter, the corresponding repetition field in the configuration information of the CSI-RS resource or the CSI-RS resource set corresponding to the M CSI-RS takes a first value, where the first value is used to indicate that the first terminal device does not use the same spatial domain transmission filter to transmit the CSI-RS;

under the condition that the M CSI-RSs are used for selecting a target airspace receiving filter, a second value is taken by a corresponding repeated field in the configuration information of the CSI-RS resources or the CSI-RS resource set corresponding to the M CSI-RSs, and the second value is used for indicating the first terminal equipment to send the CSI-RSs by using the same airspace sending filter.

In some embodiments, the communication unit 310 is further configured to send second indication information to the second terminal device;

In some embodiments, the communication unit 310 is further configured to send first side configuration information to the second terminal device;

wherein the first side configuration information includes at least one of:

index of the CSI-RS resource corresponding to the M CSI-RS, index of the CSI-RS resource set corresponding to the M CSI-RS, correspondence between the CSI-RS resource set corresponding to the M CSI-RS and channel state information CSI reporting amount, number of CSI-RS resources included in the CSI-RS resource set corresponding to the M CSI-RS, value of the M, indication information for indicating a QCL type, periodicity of the CSI-RS resource, time slot offset of the CSI-RS resource, minimum time interval, time interval of two adjacent CSI-RS in the M CSI-RS, indication information for indicating frequency domain resources occupied by the CSI-RS in the M CSI-RS, frequency domain resources included by each CSI-RS resource corresponding to the M CSI-RS, minimum frequency domain resource size included by each CSI-RS resource corresponding to the M CSI-RS, interval of adjacent PRBs for indicating a frequency domain position of the CSI-RS resource in one PRB, indication information for indicating a CSI-RS density, a multiplexing mode for indicating a number of CSI-RS resource in a multiplexing mode by using a CSI-RS, and a multiplexing mode for indicating a CSI-RS, a number of a CSI-RS is allocated to a terminal, a multiplexing device is allocated to the first CSI-RS, a multiplexing device, a second CSI-RS, a multiplexing device, or a multiplexing device, and a number of the CSI-RS is allocated to the first device, and a second device, and a multiplexing device;

In some embodiments, the CSI reporting amount includes at least one of:

the CSI-RS resource indicates CRI, CRI and Reference Signal Received Power (RSRP), CRI and signal to interference plus noise ratio (SINR), time slot indication information and RSRP, and time slot indication information and SINR are not reported; the time slot indication information is used for indicating the time slot where the CSI-RS is located.

the system comprises a CSI-RS resource set identifier, a CSI-RS resource identifier, a Cyclic Redundancy Check (CRC) sequence generated based on a SCI, source identification information, destination identification information and a scrambling code identifier;

In some embodiments, the communication unit may be a communication interface or transceiver, or an input/output interface of a communication chip or a system on a chip. The processing unit may be one or more processors.

It should be understood that the terminal device 300 according to the embodiment of the present application may correspond to the first terminal device in the embodiment of the method of the present application, and the foregoing and other operations and/or functions of each unit in the terminal device 300 are respectively for implementing the corresponding flow of the first terminal device in the method 200 shown in fig. 14, and are not repeated herein for brevity.

Fig. 24 shows a schematic block diagram of a terminal device 400 according to an embodiment of the present application. The terminal device 400 is a second terminal device, as shown in fig. 24, the terminal device 400 includes:

a communication unit 410, configured to receive M CSI-RSs transmitted by the first terminal device using the spatial domain transmission filter;

In some embodiments, the data on the third-last time domain symbol is a repetition of the data on the second-last time domain symbol, or the data on the third-last time domain symbol is the same as the data on the second-last time domain symbol.

In some embodiments, the CSI-RS resources or CSI-RS resource sets corresponding to the M CSI-RS are determined based on CSI-RS resource configuration information.

In some embodiments, the communication unit 410 is further configured to receive second indication information sent by the first terminal device;

In some embodiments, the communication unit 410 is further configured to receive first side configuration information sent by the first terminal device;

wherein the first side configuration information includes at least one of:

In some embodiments, the CSI reporting amount includes at least one of: the CSI-RS resource indicates CRI, CRI and Reference Signal Received Power (RSRP), CRI and signal to interference plus noise ratio (SINR), time slot indication information and RSRP, and time slot indication information and SINR are not reported; the time slot indication information is used for indicating the time slot where the CSI-RS is located.

In some embodiments, the communication unit may be a communication interface or transceiver, or an input/output interface of a communication chip or a system on a chip.

It should be understood that the terminal device 400 according to the embodiment of the present application may correspond to the second terminal device in the embodiment of the method of the present application, and the foregoing and other operations and/or functions of each unit in the terminal device 400 are respectively for implementing the corresponding flow of the second terminal device in the method 200 shown in fig. 14, and are not repeated herein for brevity.

Fig. 25 is a schematic structural diagram of a communication device 500 provided in an embodiment of the present application. The communication device 500 shown in fig. 25 comprises a processor 510, from which the processor 510 may call and run a computer program to implement the method in the embodiments of the present application.

In some embodiments, as shown in fig. 25, the communication device 500 may also include a memory 520. Wherein the processor 510 may call and run a computer program from the memory 520 to implement the methods in embodiments of the present application.

Wherein the memory 520 may be a separate device from the processor 510 or may be integrated into the processor 510.

In some embodiments, as shown in fig. 25, the communication device 500 may further include a transceiver 530, and the processor 510 may control the transceiver 530 to communicate with other devices, and in particular, may transmit information or data to other devices, or receive information or data transmitted by other devices.

Wherein the transceiver 530 may include a transmitter and a receiver. The transceiver 530 may further include antennas, the number of which may be one or more.

In some embodiments, the communication device 500 may be specifically a terminal device in the embodiments of the present application, and the communication device 500 may implement a corresponding flow implemented by the first terminal device in each method in the embodiments of the present application, which is not described herein for brevity.

In some embodiments, the communication device 500 may be specifically a terminal device in the embodiments of the present application, and the communication device 500 may implement a corresponding flow implemented by the second terminal device in each method in the embodiments of the present application, which is not described herein for brevity.

Fig. 26 is a schematic structural view of an apparatus of an embodiment of the present application. The apparatus 600 shown in fig. 26 includes a processor 610, and the processor 610 may call and run a computer program from a memory to implement the methods in the embodiments of the present application.

In some embodiments, as shown in fig. 26, the apparatus 600 may further include a memory 620. Wherein the processor 610 may call and run a computer program from the memory 620 to implement the methods in embodiments of the present application.

The memory 620 may be a separate device from the processor 610 or may be integrated into the processor 610.

In some embodiments, the apparatus 600 may further include an input interface 630. The processor 610 may control the input interface 630 to communicate with other devices or chips, and in particular, may acquire information or data sent by the other devices or chips.

In some embodiments, the apparatus 600 may further comprise an output interface 640. Wherein the processor 610 may control the output interface 640 to communicate with other devices or chips, and in particular, may output information or data to other devices or chips.

In some embodiments, the apparatus may be applied to a terminal device in the embodiments of the present application, and the apparatus may implement a corresponding flow implemented by a first terminal device in each method in the embodiments of the present application, which is not described herein for brevity.

In some embodiments, the apparatus may be applied to a terminal device in the embodiments of the present application, and the apparatus may implement a corresponding flow implemented by a second terminal device in each method in the embodiments of the present application, which is not described herein for brevity.

In some embodiments, the device mentioned in the embodiments of the present application may also be a chip. For example, a system-on-chip or a system-on-chip, etc.

Fig. 27 is a schematic block diagram of a communication system 700 provided in an embodiment of the present application. As shown in fig. 27, the communication system 700 includes a first terminal device 710 and a second terminal device 720.

The first terminal device 710 may be used to implement the corresponding function implemented by the first terminal device in the above method, and the second terminal device 720 may be used to implement the corresponding function implemented by the second terminal device in the above method, which are not described herein for brevity.

It should be appreciated that the processor of an embodiment of the present application may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method embodiments may be implemented by integrated logic circuits of hardware in a processor or instructions in software form. The processor may be a general purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), an off-the-shelf programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in hardware, in a decoded processor, or in a combination of hardware and software modules in a decoded processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory, and the processor reads the information in the memory and, in combination with its hardware, performs the steps of the above method.

It will be appreciated that the memory in embodiments of the present application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable EPROM (EEPROM), or a flash Memory. The volatile memory may be random access memory (Random Access Memory, RAM) which acts as an external cache. By way of example, and not limitation, many forms of RAM are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (Double Data Rate SDRAM), enhanced SDRAM (ESDRAM), synchronous DRAM (SLDRAM), and Direct RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

It should be understood that the above memory is exemplary but not limiting, and for example, the memory in the embodiments of the present application may be Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), direct RAM (DR RAM), and the like. That is, the memory in embodiments of the present application is intended to comprise, without being limited to, these and any other suitable types of memory.

Embodiments of the present application also provide a computer-readable storage medium for storing a computer program.

In some embodiments, the computer readable storage medium may be applied to a terminal device in the embodiments of the present application, and the computer program causes a computer to execute a corresponding procedure implemented by the first terminal device in each method in the embodiments of the present application, which is not described herein for brevity.

In some embodiments, the computer readable storage medium may be applied to a terminal device in the embodiments of the present application, and the computer program causes a computer to execute a corresponding procedure implemented by the second terminal device in each method in the embodiments of the present application, which is not described herein for brevity.

Embodiments of the present application also provide a computer program product comprising computer program instructions.

In some embodiments, the computer program product may be applied to a terminal device in an embodiment of the present application, and the computer program instructions cause the computer to execute a corresponding procedure implemented by the first terminal device in each method in the embodiment of the present application, which is not described herein for brevity.

In some embodiments, the computer program product may be applied to a terminal device in an embodiment of the present application, and the computer program instructions cause the computer to execute a corresponding flow implemented by the second terminal device in each method in the embodiment of the present application, which is not described herein for brevity.

The embodiment of the application also provides a computer program.

In some embodiments, the computer program may be applied to a terminal device in the embodiments of the present application, and when the computer program runs on a computer, the computer is caused to execute a corresponding flow implemented by the first terminal device in each method in the embodiments of the present application, which is not described herein for brevity.

In some embodiments, the computer program may be applied to the terminal device in the embodiments of the present application, and when the computer program runs on a computer, the computer is caused to execute a corresponding flow implemented by the second terminal device in each method in the embodiments of the present application, which is not described herein for brevity.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. For such understanding, the technical solutions of the present application may be embodied in essence or in a part contributing to the prior art or in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

A method of wireless communication, comprising:

the first terminal equipment uses a space domain transmission filter to transmit M channel state information reference signals (CSI-RS) to the second terminal equipment;

one CSI-RS of the M CSI-RS occupies a second last time domain symbol and a third last time domain symbol of time domain symbols available for side transmission in one time slot, the M CSI-RS are used for selecting a target spatial transmit filter, or the M CSI-RS are used for selecting a target spatial receive filter, and M is a positive integer.
The method of claim 1, wherein the data on the third-last time domain symbol is a repetition of the data on the second-last time domain symbol or the data on the third-last time domain symbol is the same as the data on the second-last time domain symbol.
The method according to claim 1 or 2, wherein one time domain symbol preceding the third last time domain symbol is a guard interval GP symbol and/or one time domain symbol following the second last time domain symbol is a GP symbol.
A method according to any one of claims 1 to 3, wherein the method further comprises:

and the first terminal equipment determines the CSI-RS resources or the CSI-RS resource sets corresponding to the M CSI-RSs according to the CSI-RS resource configuration information.
The method of claim 4, wherein the CSI-RS resource configuration information comprises at least one of:

the method comprises the steps of periodicity of CSI-RS resources, time slot offset of the CSI-RS resources, minimum time interval, time interval of two adjacent CSI-RSs, indication information of frequency domain resources which can be used for transmitting the CSI-RSs, frequency domain resources which are included by each CSI-RS resource, minimum frequency domain resource size which is included by each CSI-RS resource, interval of adjacent Physical Resource Blocks (PRBs) of mapping the CSI-RSs, indication information of frequency domain positions of the CSI-RSs in one PRB, CSI-RS density, indication information of the number of the CSI-RSs which are multiplexed in a code division multiplexing mode, a code division multiplexing type and scrambling code identification.
The method of claim 5, wherein,

the slot offset of the CSI-RS resource represents a slot offset of a first slot including the CSI-RS relative to a first time domain location, wherein the first time domain location includes a first slot in SFN #0 or a first slot in DFN # 0.
The method of claim 5, wherein,

the minimum time interval represents a minimum time interval between the CSI-RS and first indication information associated with the CSI-RS, and the first indication information is used for indicating the first terminal equipment to send the CSI-RS.
The method of claim 7, wherein,

and if the first indication information and the first CSI-RS in the M CSI-RSs are in the same time slot, the minimum time interval is equal to 0.
The method of claim 5, wherein,

the time interval of the adjacent two CSI-RSs is represented by the number of time slots, or the time interval of the adjacent two CSI-RSs is represented by the number of periods of the CSI-RS resources.
The method of claim 5, wherein,

and under the condition that the time interval of the two adjacent CSI-RSs is not included in the CSI-RS resource configuration information, the time interval of the two adjacent CSI-RSs is a period of one CSI-RS resource.
The method of claim 5, wherein,

the frequency domain resource indication information which can be used for transmitting the CSI-RS resource is used for determining information of PRBs which can be used for transmitting the CSI-RS.
The method of claim 11, wherein the information of PRBs available for transmitting CSI-RS is indicated by a bit map, wherein each bit in the bit map corresponds to one PRB, and wherein a length of the bit map is determined according to at least one of: the number of PRBs included in the sidelink carrier, the number of PRBs included in the sidelink bandwidth part BWP, and the number of PRBs included in the resource pool.
The method of claim 11, wherein the information of PRBs available for transmitting CSI-RS is determined by a starting frequency domain position and a frequency domain length available for transmitting CSI-RS.
The method of claim 13, wherein,

frequency domain resources included in the frequency domain resources determined based on the starting frequency domain position and the frequency domain length and used for transmitting a physical sidelink feedback channel PSFCH and/or a sidelink positioning reference signal are not used for transmitting CSI-RS.
The method of claim 5, wherein,

the interval of adjacent PRBs mapped to the CSI-RS is used for determining the interval between two adjacent PRBs in a plurality of PRBs mapped to one CSI-RS, wherein the interval between the two adjacent PRBs is represented by the number of PRBs available for transmitting the CSI-RS.
The method of claim 5, wherein,

and under the condition that the interval of adjacent PRBs for mapping the CSI-RS is not included in the CSI-RS resource configuration information, one CSI-RS occupies the adjacent PRBs which can be used for CSI-RS transmission.
The method of claim 5, wherein the indication information of the frequency domain location of the CSI-RS resources within the one PRB is used to indicate the frequency domain location of the CSI-RS resources within the one PRB.
The method of claim 17, wherein the M CSI-RSs transmitted by the first terminal device occupy the same REs within a PRB.
The method of claim 5, wherein the code division multiplexing type comprises:

code division multiplexing CDM, or, CDM and frequency division multiplexing FDM.
The method of claim 5, wherein the scrambling code identification is used to generate CSI-RS sequences.
The method of any of claims 4 to 20, wherein the CSI-RS resource configuration information further comprises at least one of:

the index of the CSI-RS resources corresponding to the M CSI-RS, the index of the CSI-RS resource set corresponding to the M CSI-RS, the correspondence between the CSI-RS resource set corresponding to the M CSI-RS and the reporting amount of the channel state information CSI, the number of CSI-RS resources included in the CSI-RS resource set corresponding to the M CSI-RS, which is used for indicating the indication information of the quasi co-sited QCL type, the number of CSI-RS resources reported or fed back to the first terminal device by the second terminal device, and the value of the corresponding repeated field in the configuration information of the CSI-RS resources or the CSI-RS resource set corresponding to the M CSI-RS;

The first terminal equipment sends the CSI-RS by using the same space domain sending filter, wherein a first value is taken by a corresponding repeated field in the configuration information of the CSI-RS resources or the CSI-RS resource sets corresponding to the M CSI-RSs, and the second value is taken by a corresponding repeated field in the configuration information of the CSI-RS resources or the CSI-RS resource sets corresponding to the M CSI-RSs, and the first terminal equipment sends the CSI-RS by using the same space domain sending filter.
The method according to any one of claim 1 to 21,

the CSI-RS resources in different time slots have the same frequency domain resource; and/or, the CSI-RS resources in different time slots have the same code domain resource; and/or, the CSI-RS resources in different slots have the same sequence.
The method according to any one of claim 1 to 21,

the CSI-RS resources in different time slots have different frequency domain resources and/or the CSI-RS resources in different time slots have different code domain resources and/or the CSI-RS resources in different time slots have different sequences.
The method according to any one of claim 1 to 23,

under the condition that the M CSI-RSs are used for selecting a target airspace transmission filter, a first value is taken by a corresponding repeated field in configuration information of CSI-RS resources or CSI-RS resource sets corresponding to the M CSI-RSs, and the first value is used for indicating that the first terminal equipment does not use the same airspace transmission filter to transmit the CSI-RSs;

And under the condition that the M CSI-RSs are used for selecting a target airspace receiving filter, the corresponding repeated fields in the configuration information of the CSI-RS resources or the CSI-RS resource sets corresponding to the M CSI-RSs take a second value, and the second value is used for indicating the first terminal equipment to send the CSI-RSs by using the same airspace sending filter.
The method of any one of claims 1 to 24, wherein the method further comprises:

the first terminal equipment sends second indication information to the second terminal equipment;

the second indication information is used for indicating that the CSI-RS sent by the first terminal equipment is used for selecting an airspace sending filter used for the first terminal equipment to send sidestream data; or the second indication information is used for indicating that the CSI-RS sent by the first terminal equipment is used for selecting an airspace receiving filter for the second terminal equipment to receive sidestream data; or, the second indication information is used for indicating that the CSI-RS sent by the first terminal device is used for measuring channel state information.
The method of any one of claims 1 to 25, wherein the method further comprises:

the first terminal equipment sends first side configuration information to the second terminal equipment;

Wherein the first side row configuration information includes at least one of:

index of the CSI-RS resources corresponding to the M CSI-RSs, index of the CSI-RS resource set corresponding to the M CSI-RSs, corresponding relation between the CSI-RS resource set corresponding to the M CSI-RSs and reporting amount of channel state information CSI, quantity of the CSI-RS resources included in the CSI-RS resource set corresponding to the M CSI-RSs, value of the M, indication information for indicating QCL type, periodicity of the CSI-RSs resources, time slot offset of the CSI-RSs resources, minimum time interval, time interval of two adjacent CSI-RSs in the M CSI-RSs, indication information for indicating frequency domain resources occupied by the CSI-RSs in the M CSI-RSs, the method comprises the steps that each CSI-RS resource corresponding to M CSI-RSs comprises frequency domain resources, the minimum frequency domain resource size of each CSI-RS resource corresponding to the M CSI-RSs is mapped to the interval of adjacent PRBs of the CSI-RSs, indication information used for indicating the frequency domain position of the CSI-RSs in one PRB, the CSI-RS density is used for indicating the number of the CSI-RSs multiplexed in a code division multiplexing mode, the code division multiplexing type and scrambling code identification, the second terminal equipment reports or feeds back the number of the CSI-RSs to the first terminal equipment, and the value of a corresponding repeated field in configuration information of the CSI-RSs resources corresponding to the M CSI-RSs or the CSI-RS resource set is obtained;

The first terminal equipment sends the CSI-RS by using the same space domain sending filter, wherein a first value is taken by a corresponding repeated field in the configuration information of the CSI-RS resources or the CSI-RS resource sets corresponding to the M CSI-RSs, and the second value is taken by a corresponding repeated field in the configuration information of the CSI-RS resources or the CSI-RS resource sets corresponding to the M CSI-RSs, and the first terminal equipment sends the CSI-RS by using the same space domain sending filter.
The method of claim 21 or 26, wherein the CSI reporting amount comprises at least one of:

the CSI-RS resource indicates CRI, CRI and Reference Signal Received Power (RSRP), CRI and signal to interference plus noise ratio (SINR), time slot indication information and RSRP, and time slot indication information and SINR are not reported;

the time slot indication information is used for indicating the time slot where the CSI-RS is located.
The method according to any one of claim 1 to 27,

the sequence corresponding to one of the M CSI-RSs is determined according to at least one of the following information:

the system comprises a CSI-RS resource set identifier, a CSI-RS resource identifier, a Cyclic Redundancy Check (CRC) sequence generated based on a SCI, source identification information, destination identification information and a scrambling code identifier;

The SCI is associated with the CSI-RS, the source identification information is used for indicating terminal identification information for sending the CSI-RS, the destination identification information is used for indicating terminal identification information for receiving the CSI-RS, and the scrambling code identification is determined according to scrambling code identification information included in the CSI-RS resource allocation information corresponding to the CSI-RS.
The method of claim 28, wherein,

the source identification information is determined according to the source identification information in the SCI associated with the CSI-RS, and the destination identification information is determined according to the destination identification information in the SCI associated with the CSI-RS.
A method of wireless communication, comprising:

the second terminal equipment receives M channel state information reference signals (CSI-RS) sent by the first terminal equipment by using a spatial domain sending filter;

one CSI-RS of the M CSI-RS occupies a second last time domain symbol and a third last time domain symbol of time domain symbols available for side transmission in one time slot, the M CSI-RS are used for selecting a target spatial transmit filter, or the M CSI-RS are used for selecting a target spatial receive filter, and M is a positive integer.
The method of claim 30, wherein the data on the third last time domain symbol is a repetition of the data on the second last time domain symbol or the data on the third last time domain symbol is the same as the data on the second last time domain symbol.
The method according to claim 30 or 31, wherein one time domain symbol preceding the third last time domain symbol is a guard interval, GP, symbol and/or one time domain symbol following the second last time domain symbol is a GP symbol.
The method of any one of claim 30 to 32,

and the CSI-RS resources or the CSI-RS resource sets corresponding to the M CSI-RSs are determined based on the CSI-RS resource configuration information.
The method of claim 33, wherein the CSI-RS resource configuration information comprises at least one of:

the method comprises the steps of periodicity of CSI-RS resources, time slot offset of the CSI-RS resources, minimum time interval, time interval of two adjacent CSI-RSs, indication information of frequency domain resources which can be used for transmitting the CSI-RSs, frequency domain resources which are included by each CSI-RS resource, minimum frequency domain resource size which is included by each CSI-RS resource, interval of adjacent Physical Resource Blocks (PRBs) of mapping the CSI-RSs, indication information of frequency domain positions of the CSI-RSs in one PRB, CSI-RS density, indication information of the number of the CSI-RSs which are multiplexed in a code division multiplexing mode, a code division multiplexing type and scrambling code identification.
The method of claim 34, wherein,

the slot offset of the CSI-RS resource represents a slot offset of a first slot including the CSI-RS relative to a first time domain location, wherein the first time domain location includes a first slot in SFN #0 or a first slot in DFN # 0.
The method of claim 34, wherein,

the minimum time interval represents a minimum time interval between the CSI-RS and first indication information associated with the CSI-RS, and the first indication information is used for indicating the first terminal equipment to send the CSI-RS.
The method of claim 36, wherein,

and if the first indication information and the first CSI-RS in the M CSI-RSs are in the same time slot, the minimum time interval is equal to 0.
The method of claim 34, wherein,

the time interval of the adjacent two CSI-RSs is represented by the number of time slots, or the time interval of the adjacent two CSI-RSs is represented by the number of periods of the CSI-RS resources.
The method of claim 34, wherein,

and under the condition that the time interval of the two adjacent CSI-RSs is not included in the CSI-RS resource configuration information, the time interval of the two adjacent CSI-RSs is a period of one CSI-RS resource.
The method of claim 34, wherein,

the frequency domain resource indication information which can be used for transmitting the CSI-RS resource is used for determining information of PRBs which can be used for transmitting the CSI-RS.
The method of claim 40, wherein the information of PRBs available for transmitting CSI-RS is indicated by a bit map, wherein each bit in the bit map corresponds to one PRB, and wherein a length of the bit map is determined according to at least one of: the number of PRBs included in the sidelink carrier, the number of PRBs included in the sidelink bandwidth part BWP, and the number of PRBs included in the resource pool.
The method of claim 40, wherein the information of PRBs available for transmitting CSI-RS is determined by a starting frequency domain position and a frequency domain length available for transmitting CSI-RS.
The method of claim 42, wherein,

frequency domain resources included in the frequency domain resources determined based on the starting frequency domain position and the frequency domain length and used for transmitting a physical sidelink feedback channel PSFCH and/or a sidelink positioning reference signal are not used for transmitting CSI-RS.
The method of claim 34, wherein,

the interval of adjacent PRBs mapped to the CSI-RS is used for determining the interval between two adjacent PRBs in a plurality of PRBs mapped to one CSI-RS, wherein the interval between the two adjacent PRBs is represented by the number of PRBs available for transmitting the CSI-RS.
The method of claim 34, wherein,

and under the condition that the interval of adjacent PRBs for mapping the CSI-RS is not included in the CSI-RS resource configuration information, one CSI-RS occupies the adjacent PRBs which can be used for CSI-RS transmission.
The method of claim 34, wherein the indication information of the frequency domain location of the CSI-RS resources within the one PRB is used for indicating the frequency domain location of the CSI-RS resources within the one PRB.
The method of claim 46, wherein the M CSI-RSs transmitted by the first terminal device occupy the same REs within a PRB.
The method of claim 34, wherein the code division multiplexing type comprises:

code division multiplexing CDM, or, CDM and frequency division multiplexing FDM.
The method of claim 34, wherein the scrambling code identification is used to generate CSI-RS sequences.
The method of any of claims 33 to 49, wherein the CSI-RS resource configuration information further comprises at least one of:

the index of the CSI-RS resources corresponding to the M CSI-RS, the index of the CSI-RS resource set corresponding to the M CSI-RS, the correspondence between the CSI-RS resource set corresponding to the M CSI-RS and the reporting amount of the channel state information CSI, the number of CSI-RS resources included in the CSI-RS resource set corresponding to the M CSI-RS, which is used for indicating the indication information of the quasi co-sited QCL type, the number of CSI-RS resources reported or fed back to the first terminal device by the second terminal device, and the value of the corresponding repeated field in the configuration information of the CSI-RS resources or the CSI-RS resource set corresponding to the M CSI-RS;

The first terminal equipment sends the CSI-RS by using the same space domain sending filter, wherein a first value is taken by a corresponding repeated field in the configuration information of the CSI-RS resources or the CSI-RS resource sets corresponding to the M CSI-RSs, and the second value is taken by a corresponding repeated field in the configuration information of the CSI-RS resources or the CSI-RS resource sets corresponding to the M CSI-RSs, and the first terminal equipment sends the CSI-RS by using the same space domain sending filter.
The method of any one of claim 30 to 50,

the CSI-RS resources in different time slots have the same frequency domain resource; and/or, the CSI-RS resources in different time slots have the same code domain resource; and/or, the CSI-RS resources in different slots have the same sequence.
The method of any one of claim 30 to 50,

the CSI-RS resources in different time slots have different frequency domain resources and/or the CSI-RS resources in different time slots have different code domain resources and/or the CSI-RS resources in different time slots have different sequences.
The method of any one of claim 30 to 52,

under the condition that the M CSI-RSs are used for selecting a target airspace transmission filter, a first value is taken by a corresponding repeated field in configuration information of CSI-RS resources or CSI-RS resource sets corresponding to the M CSI-RSs, and the first value is used for indicating that the first terminal equipment does not use the same airspace transmission filter to transmit the CSI-RSs;

And under the condition that the M CSI-RSs are used for selecting a target airspace receiving filter, the corresponding repeated fields in the configuration information of the CSI-RS resources or the CSI-RS resource sets corresponding to the M CSI-RSs take a second value, and the second value is used for indicating the first terminal equipment to send the CSI-RSs by using the same airspace sending filter.
The method of any one of claims 30 to 53, further comprising:

the second terminal equipment receives second indication information sent by the first terminal equipment;

the second indication information is used for indicating that the CSI-RS sent by the first terminal equipment is used for selecting an airspace sending filter used for the first terminal equipment to send sidestream data; or the second indication information is used for indicating that the CSI-RS sent by the first terminal equipment is used for selecting an airspace receiving filter for the second terminal equipment to receive sidestream data; or, the second indication information is used for indicating that the CSI-RS sent by the first terminal device is used for measuring channel state information.
The method of any one of claims 30 to 54, further comprising:

The second terminal equipment receives first side configuration information sent by the first terminal equipment;

wherein the first side row configuration information includes at least one of:

index of the CSI-RS resources corresponding to the M CSI-RSs, index of the CSI-RS resource set corresponding to the M CSI-RSs, corresponding relation between the CSI-RS resource set corresponding to the M CSI-RSs and reporting amount of channel state information CSI, quantity of the CSI-RS resources included in the CSI-RS resource set corresponding to the M CSI-RSs, value of the M, indication information for indicating QCL type, periodicity of the CSI-RSs resources, time slot offset of the CSI-RSs resources, minimum time interval, time interval of two adjacent CSI-RSs in the M CSI-RSs, indication information for indicating frequency domain resources occupied by the CSI-RSs in the M CSI-RSs, the method comprises the steps that each CSI-RS resource corresponding to M CSI-RSs comprises frequency domain resources, the minimum frequency domain resource size of each CSI-RS resource corresponding to the M CSI-RSs is mapped to the interval of adjacent PRBs of the CSI-RSs, indication information used for indicating the frequency domain position of the CSI-RSs in one PRB, the CSI-RS density is used for indicating the number of the CSI-RSs multiplexed in a code division multiplexing mode, the code division multiplexing type and scrambling code identification, the second terminal equipment reports or feeds back the number of the CSI-RSs to the first terminal equipment, and the value of a corresponding repeated field in configuration information of the CSI-RSs resources corresponding to the M CSI-RSs or the CSI-RS resource set is obtained;

The first terminal equipment sends the CSI-RS by using the same space domain sending filter, wherein a first value is taken by a corresponding repeated field in the configuration information of the CSI-RS resources or the CSI-RS resource sets corresponding to the M CSI-RSs, and the second value is taken by a corresponding repeated field in the configuration information of the CSI-RS resources or the CSI-RS resource sets corresponding to the M CSI-RSs, and the first terminal equipment sends the CSI-RS by using the same space domain sending filter.
The method of claim 50 or 55, wherein the CSI reporting amount comprises at least one of:

the CSI-RS resource indicates CRI, CRI and Reference Signal Received Power (RSRP), CRI and signal to interference plus noise ratio (SINR), time slot indication information and RSRP, and time slot indication information and SINR are not reported;

the time slot indication information is used for indicating the time slot where the CSI-RS is located.
The method of any of claims 30-56, wherein a sequence corresponding to one of the M CSI-RSs is determined from at least one of:

the system comprises a CSI-RS resource set identifier, a CSI-RS resource identifier, a Cyclic Redundancy Check (CRC) sequence generated based on a SCI, source identification information, destination identification information and a scrambling code identifier;

The SCI is associated with the CSI-RS, the source identification information is used for indicating terminal identification information for sending the CSI-RS, the destination identification information is used for indicating terminal identification information for receiving the CSI-RS, and the scrambling code identification is determined according to scrambling code identification information included in the CSI-RS resource allocation information corresponding to the CSI-RS.
The method of claim 57, wherein,

the source identification information is determined according to the source identification information in the SCI associated with the CSI-RS, and the destination identification information is determined according to the destination identification information in the SCI associated with the CSI-RS.
A terminal device, wherein the terminal device is a first terminal device, the terminal device comprising:

a communication unit, configured to send M channel state information reference signals CSI-RS to a second terminal device using a spatial domain transmission filter;

one CSI-RS of the M CSI-RS occupies a second last time domain symbol and a third last time domain symbol of time domain symbols available for side transmission in one time slot, the M CSI-RS are used for selecting a target spatial transmit filter, or the M CSI-RS are used for selecting a target spatial receive filter, and M is a positive integer.
A terminal device, wherein the terminal device is a second terminal device, the terminal device comprising:

a communication unit, configured to receive M channel state information reference signals CSI-RS transmitted by a first terminal device using a spatial domain transmission filter;

one CSI-RS of the M CSI-RS occupies a second last time domain symbol and a third last time domain symbol of time domain symbols available for side transmission in one time slot, the M CSI-RS are used for selecting a target spatial transmit filter, or the M CSI-RS are used for selecting a target spatial receive filter, and M is a positive integer.
A terminal device, comprising: a processor and a memory for storing a computer program, the processor being adapted to invoke and run the computer program stored in the memory, to perform the method of any of claims 1 to 29, or to perform the method of any of claims 30 to 58.
A chip, comprising: a processor for calling and running a computer program from a memory, causing a device on which the chip is mounted to perform the method of any one of claims 1 to 29 or to perform the method of any one of claims 30 to 58.
A computer readable storage medium storing a computer program for causing a computer to perform the method of any one of claims 1 to 29 or to perform the method of any one of claims 30 to 58.
A computer program product comprising computer program instructions for causing a computer to perform the method of any one of claims 1 to 29 or to perform the method of any one of claims 30 to 58.
A computer program, characterized in that the computer program causes a computer to perform the method according to any one of claims 1 to 29 or to perform the method according to any one of claims 30 to 58.