CN118077277A

CN118077277A - Sidestream transmission method and device and terminal equipment

Info

Publication number: CN118077277A
Application number: CN202180103096.2A
Authority: CN
Inventors: 赵振山; 林晖闵; 史志华; 陈文洪
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2021-12-21
Filing date: 2021-12-21
Publication date: 2024-05-24
Also published as: WO2023115335A1

Abstract

The embodiment of the application provides a sidestream transmission method and device and terminal equipment, wherein the method comprises the following steps: the first terminal device uses a first default spatial domain transmission filter to transmit a first sidelink transmission to the second terminal device, and/or uses a first default spatial domain reception filter to receive a second sidelink transmission transmitted by the second terminal device.

Description

Sidestream transmission method and device and terminal equipment

Technical Field

The embodiment of the application relates to the technical field of mobile communication, in particular to a sidestream transmission method and device and terminal equipment.

Background

In order to increase the transmission rate of the sidestream transmission system, it is considered to use the millimeter wave band in the sidestream transmission system. In the side millimeter wave transmission system, it is necessary to determine an optimal transmission beam, such as an optimal transmission beam and an optimal reception beam, of the terminal device, and the terminal device uses the optimal transmission beam for side communication. However, in some cases, such as where the terminal device has not determined the optimal beam or cannot use the optimal beam, how the terminal device performs sidestream communication needs to be addressed.

Disclosure of Invention

The embodiment of the application provides a sidestream transmission method and device, terminal equipment, a chip, a computer readable storage medium, a computer program product and a computer program.

The lateral transmission method provided by the embodiment of the application comprises the following steps:

The first terminal device sends a first sidelink transmission to the second terminal device using a first default spatial transmit filter (spatial domain transmission filter) and/or receives a second sidelink transmission sent by the second terminal device using a first default spatial receive filter (spatial domain reception filter).

The second terminal device receives the first sidestream transmission sent by the first terminal device by using a third default airspace receiving filter, and/or sends the second sidestream transmission to the first terminal device by using a third default airspace sending filter.

The sidestream transmission device provided by the embodiment of the application is applied to first terminal equipment, and comprises:

And the transmission unit is used for transmitting the first side line transmission to the second terminal equipment by using the first default airspace transmission filter and/or receiving the second side line transmission transmitted by the second terminal equipment by using the first default airspace reception filter.

The sidestream transmission device provided by the embodiment of the application is applied to second terminal equipment, and comprises:

And the transmission unit is used for receiving the first side line transmission sent by the first terminal equipment by using a third default airspace receiving filter and/or sending the second side line transmission to the first terminal equipment by using a third default airspace sending filter.

The terminal equipment provided by the embodiment of the application comprises 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 side line transmission method.

The chip provided by the embodiment of the application is used for realizing the lateral transmission method.

Specifically, the chip includes: and a processor for calling and running the computer program from the memory, so that the device mounted with the chip executes the side-line transmission method.

The computer readable storage medium provided by the embodiment of the application is used for storing a computer program, and the computer program enables a computer to execute the side line transmission method.

The computer program product provided by the embodiment of the application comprises computer program instructions, wherein the computer program instructions enable a computer to execute the lateral transmission method.

The computer program provided by the embodiment of the application, when running on a computer, causes the computer to execute the lateral transmission method.

By means of the technical scheme, under the condition that the first terminal equipment does not determine the optimal beam or cannot use the optimal beam, the first terminal equipment uses the first default airspace transmission filter (namely, the first default transmission beam) to transmit the first sidestream transmission to the second terminal equipment, and/or uses the first default airspace reception filter (namely, the first default reception beam) to receive the second sidestream transmission transmitted by the second terminal equipment, so that normal sidestream communication between the first terminal equipment and the second terminal equipment can be achieved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:

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

fig. 2-1 is a schematic diagram of communication performed on the inner side of a network coverage area according to an embodiment of the present application;

Fig. 2-2 are schematic diagrams of partial network coverage sidestream communications provided by an embodiment of the present application;

FIGS. 2-3 are schematic diagrams of network coverage outside line communications provided by embodiments of the present application;

FIGS. 2-4 are schematic diagrams of control side-by-side communications with a central control node provided by embodiments of the present application;

fig. 3-1 is a schematic diagram of a unicast transmission manner provided in an embodiment of the present application;

fig. 3-2 is a schematic diagram of a multicast transmission mode according to an embodiment of the present application;

fig. 3-3 are schematic diagrams of a broadcast transmission manner according to an embodiment of the present application;

Fig. 4 is a schematic diagram of a slot structure provided by an embodiment of the present application;

fig. 5 is a schematic diagram of a SL CSI-RS time-frequency position according to an embodiment of the present application;

fig. 6 is a schematic diagram of non-beamforming and beamforming provided by an embodiment of the present application;

Fig. 7 is a schematic diagram of a TCI state configuration method of PDSCH according to an embodiment of the present application;

FIG. 8 is a schematic diagram of beam selection provided by an embodiment of the present application;

Fig. 9 is a schematic flow chart of a sidestream transfer method according to an embodiment of the present application;

Fig. 10 is a second flow chart of a sidestream transmission method according to an embodiment of the present application;

Fig. 11 is a schematic diagram of a process of determining an optimal transmit beam by a transmitting end according to an embodiment of the present application;

FIG. 12 is a schematic diagram of time domain positions of a first default beam and a target transmit beam provided by an embodiment of the present application;

Fig. 13 is a schematic diagram of a structure of a lateral conveying device according to an embodiment of the present application;

fig. 14 is a schematic diagram II of the structural composition of a lateral conveying device according to an embodiment of the present application;

fig. 15 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 16 is a schematic structural view of a chip of an embodiment of the present application.

Detailed Description

The following description of the technical solutions according to the embodiments of the present application will be given with reference to the accompanying 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 those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Fig. 1 is a schematic diagram of an application scenario according to an embodiment of the present application.

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

It should be understood that embodiments of the present application are illustrated by way of example only with respect to communication system 100, and embodiments of the present application are not limited thereto. That is, the technical solution of the embodiment of the present application may be applied to various communication systems, for example: long term evolution (Long Term Evolution, LTE) systems, LTE time division duplex (Time Division Duplex, TDD), universal mobile telecommunications system (Universal Mobile Telecommunication System, UMTS), internet of things (Internet of Things, ioT) systems, narrowband internet of things (Narrow Band Internet of Things, NB-IoT) systems, enhanced machine type communications (ENHANCED MACHINE-Type Communications, eMTC) systems, 5G communication systems (also known as New Radio (NR) communication systems), or future communication systems, etc.

In the communication system 100 shown in fig. 1, the network device 120 may be an access network device in communication with the terminal device 110. The access network device may provide communication coverage for a particular geographic area and may communicate with terminal devices 110 (e.g., UEs) located within the coverage area.

The network device 120 may be an evolved base station (Evolutional Node B, eNB or eNodeB) in a long term evolution (Long Term Evolution, LTE) system, or a next generation radio access network (Next Generation Radio Access Network, NG RAN) device, or a base station (gNB) in a NR system, or a radio controller in a cloud radio access network (Cloud Radio Access Network, CRAN), or the network device 120 may be a relay station, an access point, a vehicle device, a wearable device, a hub, a switch, a bridge, a router, or a network device in a future evolved public land mobile network (Public Land Mobile Network, PLMN), etc.

Terminal device 110 may be any terminal device including, but not limited to, a terminal device that employs a wired or wireless connection with network device 120 or other terminal devices.

For example, the terminal device 110 may refer to an access terminal, user Equipment (UE), subscriber unit, subscriber station, mobile station, remote terminal, mobile device, user terminal, wireless communication device, user agent, or User Equipment. An access terminal may be a cellular telephone, a cordless telephone, a session initiation protocol (Session Initiation Protocol, SIP) phone, an IoT device, a satellite handset, a wireless local loop (Wireless Local Loop, WLL) station, a Personal digital assistant (Personal DIGITAL ASSISTANT, PDA), a handset 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 5G network or a terminal device in a future evolution network, etc.

The terminal Device 110 may be used for Device-to-Device (D2D) communication.

The wireless communication system 100 may further comprise a core network device 130 in communication with the base station, which core network device 130 may be a 5G core,5gc device, e.g. an access and mobility management function (ACCESS AND Mobility Management Function, AMF), further e.g. an authentication server function (Authentication Server Function, AUSF), further e.g. a user plane function (User Plane Function, UPF), further e.g. a session management function (Session Management Function, SMF). Optionally, the Core network device 130 may also be a packet Core evolution (Evolved Packet Core, EPC) device of the LTE network, for example, a session management function+a data gateway (Session Management Function +core PACKET GATEWAY, SMF +pgw-C) device of the Core network. It should be appreciated that SMF+PGW-C may perform the functions performed by both SMF and PGW-C. In the network evolution process, the core network device may also call other names, or form new network entities by dividing the functions of the core network, which is not limited in this embodiment of the present application.

Communication may also be achieved by establishing connections between various functional units in the communication system 100 through a next generation Network (NG) interface.

For example, the terminal device establishes an air interface connection with the access network device through an NR interface, and is used for transmitting user plane data and control plane signaling; the terminal equipment can establish control plane signaling connection with AMF through NG interface 1 (N1 for short); an access network device, such as a next generation radio access base station (gNB), can establish a user plane data connection with a UPF through an NG interface 3 (N3 for short); the access network equipment can establish control plane signaling connection with AMF through NG interface 2 (N2 for short); the UPF can establish control plane signaling connection with the SMF through an NG interface 4 (N4 for short); the UPF can interact user plane data with the data network through an NG interface 6 (N6 for short); the AMF may establish a control plane signaling connection with the SMF through NG interface 11 (N11 for short); the SMF may establish a control plane signaling connection with the PCF via NG interface 7 (N7 for short).

Fig. 1 exemplarily illustrates one base station, one core network device, and two terminal devices, alternatively, the wireless communication system 100 may include a plurality of base station devices and each base station may include other number of terminal devices within a coverage area, which is not limited by the embodiment of the present application.

It should be noted that fig. 1 is only an exemplary system to which the present application is applicable, and of course, the method shown in the embodiment of the present application may be applicable to other systems. Furthermore, the terms "system" and "network" are often 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. It should also 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. It should also be understood that "corresponding" mentioned in the embodiments of the present application may mean that there is a direct correspondence or an indirect correspondence between the two, may mean that there is an association between the two, and may also be a relationship between an instruction and an indicated, configured, or the like. It should also be understood that "predefined" or "predefined rules" mentioned in the embodiments of the present application may be implemented by pre-storing corresponding codes, tables or other manners in which related information may be indicated in devices (including, for example, terminal devices and network devices), and the present application is not limited to the specific implementation thereof. Such as predefined may refer to what is defined in the protocol. It should be further understood that, in the embodiment of the present application, the "protocol" may refer to a standard protocol in the field of communications, and may include, for example, an LTE protocol, an NR protocol, and related protocols applied in a future communication system, which is not limited by the present application.

In order to facilitate understanding of the technical solutions of the embodiments of the present application, the following description describes related technologies of the embodiments of the present application, and the following related technologies may be optionally combined with the technical solutions of the embodiments of the present application as alternatives, which all belong to the protection scope of the embodiments of the present application.

Sidestream communication in different network coverage environments

In the side line communication, according to the network coverage condition of the terminal device for communication, the side line communication can be classified into the network coverage inner line communication, the partial network coverage side line communication and the network coverage outer line communication.

As shown in fig. 2-1, in the network coverage inside-line communication, all terminal devices performing side-line communication are located in the coverage of the same base station, so that the terminal devices can perform side-line communication based on the same side-line configuration by receiving the configuration signaling of the base station.

As shown in fig. 2-2, in the case of partial network coverage sidestream communication, a part of terminal equipment performing sidestream communication is located in the coverage area of the base station, and this part of terminal equipment can receive the configuration signaling of the base station and perform sidestream communication according to the configuration of the base station. In this case, the terminal device outside the network coverage area determines the sidestream configuration according to pre-configuration information and information carried in a physical sidestream broadcast channel (PHYSICAL SIDELINK Broadcast Channel, PSBCH) sent by the terminal device within the network coverage area, so as to perform sidestream communication.

As shown in fig. 2-3, for network coverage outside line communication, all terminal devices performing outside line communication are located outside the network coverage, and all terminal devices determine side line configuration according to pre-configuration information to perform side line communication.

As shown in fig. 2-4, for side-by-side communication with a central control node, a plurality of terminal devices form a communication group, which has a central control node, also called a Cluster Head (CH) terminal device, within the communication group, 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 terminal equipment, and receiving side feedback information of other terminal equipment; and performing resource coordination and other functions with other communication groups.

Device-to-Device (D2D)/Vehicle-to-Device (V2X) to other devices

Device-to-device communication is a D2D based sidelink (Sidelink, SL) transmission technique, and has higher spectral efficiency and lower transmission delay than conventional cellular systems in which communication data is received or transmitted by a base station. The internet of vehicles system adopts a device-to-device direct communication mode, and defines two transmission modes: a first mode and a second mode.

First mode: the transmission resources of the terminal equipment are allocated by the base station, and the terminal equipment transmits data on the side link according to the resources allocated by the base station. The base station may allocate resources for single transmission to the terminal device, or may allocate resources for semi-static transmission to the terminal device. For example, in fig. 2-1, the terminal device is located in the coverage area of the network, and the base station allocates transmission resources for side transmission to the terminal device.

Second mode: the terminal equipment selects one resource from the resource pool to transmit data. For example, in fig. 2-3, the terminal device is located outside the coverage area of the cell, and the terminal device autonomously selects transmission resources from the preconfigured resource pool to perform side transmission. Or for example, in fig. 1-1, the terminal device autonomously selects transmission resources from a resource pool configured by the network to perform side transmission.

The names of the first mode and the second mode are not limited in the present application.

In NR-V2X, automatic driving needs to be supported, and thus, higher demands are placed on data interaction between vehicles, such as higher throughput, lower latency, higher reliability, larger coverage, more flexible resource allocation, etc.

In LTE-V2X, a broadcast transmission scheme is supported, and in NR-V2X, a unicast transmission scheme and a multicast transmission scheme are introduced. For the unicast transmission mode, the receiving end has only one terminal device, as in fig. 3-1, and unicast transmission is performed between the terminal device 1 and the terminal device 2. For multicast transmission mode, the receiving end is all the terminal devices in a communication group, or all the terminal devices in a certain transmission distance, as in fig. 3-2, the terminal device 1, the terminal device 2, the terminal device 3 and the terminal device 4 form a communication group, wherein the terminal device 1 sends data, and the other terminal devices in the group are all receiving ends. For the broadcast transmission mode, the receiving end is any one of the terminal devices around the transmitting end, as in fig. 3-3, the terminal device 1 is the transmitting end, and the other terminal devices around it (such as the terminal device 2 and the terminal device 6) are all receiving ends.

NR-V2X system frame structure

The slot structure in NR-V2X is shown in fig. 4, where (a) in fig. 4 illustrates the slot structure in which the Physical Side Feedback Channel (PSFCH) is not included in the slot; fig. 4 (b) illustrates a slot structure including PSFCH of slots.

In NR-V2X, a Physical Sidelink Control Channel (PSCCH) occupies 2 or 3 time domain symbols from the second time domain symbol of the slot in the time domain, and {10,12, 15,20,25} physical resource blocks (Physical Resource Block, PRBs) may be occupied in the frequency domain. In order to reduce the complexity of blind detection of the PSCCH by the terminal device, only one time domain symbol number and PRB number are allowed to be configured for the PSCCH 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 limitation on PSSCH resource selection or allocation. The PSSCH also starts in the time domain from the second time domain symbol of the slot, the last time domain symbol in the slot is used as Guard Period (GP) symbol, and the remaining symbols map the PSSCH. The first time domain symbol in the slot is a repetition of the second time domain symbol, and typically the first time domain symbol is used by the receiving end as an automatic gain control (Automatic Gain Control, AGC) symbol, the data on which is typically not used for data demodulation. The PSSCH occupies K subchannels in the frequency domain, each of which includes N consecutive PRBs, as shown in (a) of fig. 4. When PSFCH is included in the slot, the penultimate and penultimate symbols in the slot are used for PSFCH transmission, and one time domain symbol before PSFCH is used as a GP symbol, as shown in (b) of fig. 4.

It should be noted that, for the sidelink transmission system, the time domain symbol described in the present application refers to a sidelink symbol. Wherein the time domain symbols described in the present application may be orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) symbols.

Sidestream channel state Information-reference signal (CHANNEL STATE Information-REFERENCE SIGNAL, CSI-RS)

In order to better support unicast communication, a sidelink CSI-RS (SL CSI-RS) is supported in NR-V2X, and the SL CSI-RS is transmitted only when the following three conditions are met:

1. The terminal device transmits the corresponding PSSCH, that is, the terminal device cannot transmit only the SL CSI-RS;

2. The high-layer signaling activates the reporting of the lateral channel state Information (CHANNEL STATE Information, CSI);

3. under the condition that the high-layer signaling activates the sidelink CSI reporting, corresponding bits in second-order sidelink control information (Sidelink Control Information, SCI) sent by the terminal equipment trigger the sidelink CSI reporting.

The maximum port number supported by the SL CSI-RS is 2. When the SL CSI-RS support two ports, the SL CSI-RS of different ports are multiplexed on two adjacent Resource Elements (REs) of the same time domain symbol in a code division manner, and the number of the SL CSI-RS of each port in one PRB is 1, that is, the density is 1. Therefore, the SL CSI-RS will only appear on at most one time domain symbol in one PRB, and the specific position of this symbol is determined by the transmitting end, so that in order to avoid affecting the resource mapping of PSCCH and second-order SCI, the SL CSI-RS cannot be located in the same time domain symbol as PSCCH and second-order SCI. Since the Demodulation reference signal (Demodulation REFERENCE SIGNAL, DMRS) of the PSSCH has higher channel estimation accuracy, and the SL CSI-RS of the two ports occupy two consecutive REs in the frequency domain, the SL CSI-RS cannot be located on the same time domain symbol as the DMRS of the PSSCH. The position of the symbol where the SL CSI-RS is located is indicated by the SL-CSI-RS-FirstSymbol parameter in PC5-RRC signaling.

The position of the first RE occupied by SL CSI-RS within one PRB is indicated by the SL-CSI-RS-FreqAllocation parameter in PC5-RRC signaling. If the SL CSI-RS is a port, the parameter is a bit map with the length of 12, and 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 end, 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. 5 shows a schematic diagram of a time-frequency position of the SL CSI-RS, in which the number of ports of the SL CSI-RS is 2, SL-CSI-RS-FirstSymbol is 8, and SL-CSI-RS-FreqAllocation is [ b ₅,b ₄,b ₃,b ₂,b ₁,b ₀ ] = [0,0,0,1,0,0].

Multi-beam system

Design goals for NR/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.

In a 2/3/4G typical system, one cell (sector) uses one wider beam (beam) to cover the entire cell. At each instant, therefore, terminal devices within the coverage of the cell have an opportunity to acquire the transmission resources allocated by the system.

The NR/5G Multi-beam system covers the whole cell by different beams, i.e. each beam covers a smaller range, with a scanning (sweeping) over time to achieve the effect that multiple beams cover the whole cell.

Fig. 6 presents a schematic view without and with beamforming. The left diagram in fig. 6 is a conventional scenario in which beamforming is not used, and the right diagram in fig. 6 is a scenario in which beamforming is used. In the left figure, the network side uses one wide beam to cover the whole cell, and the terminals 1-5 can receive the network signal at any time. In contrast, in the right figure, the network side uses a narrower beam, and uses different beams at different times (e.g., time 1 to time 4 in the figure) to cover different areas in the cell, e.g., at time 1, the network side covers the area where the terminal device 1 is located by the beam 1; at the moment 2, the network side covers the area where the terminal equipment 2 is located through the wave beam 2; at time 3, the network side covers the areas where the terminal equipment 3 and the terminal equipment 4 are located through the wave beam 3; at time 4, the network side covers the area where the terminal device 5 is located by the beam 4.

In the right diagram of fig. 6, the transmitted energy can be more concentrated and thus can cover a greater distance due to the narrower beams used on the network side; 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 terminal devices 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).

Currently, different beams are identified by different reference signals carried above. For example: different synchronization signal blocks (SS/PBCH, SSB) are transmitted on different beams, which can be distinguished by the terminal device. For another example: different CSI-RSs are transmitted on different beams, and the terminal equipment can identify the different beams through the CSI-RSs or the CSI-RS resources. It can be seen that the reference signal and the beam are corresponding.

In a 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 communication systems below 6G, the terminal device typically does not have an analog beam, and therefore an omni-directional antenna (or a near omni-directional antenna) is used to receive signals transmitted by the base station using different downlink transmit beams. For millimeter wave communication systems, the terminal device may have an analog beam that needs to use a corresponding downlink receive beam to receive signals transmitted by the base station using a corresponding downlink transmit beam. At this time, corresponding beam indication information (beam indication) is required to assist the terminal device in determining the related information of the transmission beam used by the base station or the related information of the reception beam used by the terminal device.

In the NR protocol, the beam indication information does not directly indicate the beam itself, but indicates by Quasi Co-Location (QCL) between signals. On the terminal device side, the corresponding channel/signal is received also based on QCL assumptions.

QCL for downlink transmission

In order to improve the reception performance when the terminal device receives signals, the reception algorithm may be improved 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 information (QCL-Info).

Downlink transmission if the downlink transmission is from different transmission receiving points (Transmission Reception Point, TRP) or antenna panels (panels) or beams, the characteristics of the transmission environment corresponding to the data transmission may also change, so in the NR system, the network side may indicate the corresponding QCL information to the terminal device by transmitting the configuration indication (Transmission Configuration Indicator, TCI) status when transmitting the downlink control channel or the data channel.

The configuration of one TCI state may include the following:

a TCI state identifier for identifying a TCI state;

QCL information 1;

QCL information 2, which is optional.

For the above QCL information, one QCL information further includes the following information:

QCL type configuration for configuring the QCL type, which may be one of QCL type a, QCL typeB, QCL type c or QCL typeD;

The QCL reference signal configuration includes a cell identifier where a reference signal is located, a BWP identifier, and an identifier of the reference signal, where the identifier of the reference signal may be a CSI-RS resource identifier or an SSB index.

If both QCL information 1 and QCL information 2 are configured, the QCL type configuration of at least one of the two QCL information must be configured as one of QCL type a, QCL typeB, QCL type c, and the QCL type configuration of the other QCL information must be configured as QCL type D.

The definition of the different QCL types is shown in table 1 below:

QCL type	Characteristics of	Action
QCL type A	Doppler shift, doppler spread, average delay, delay spread	Obtaining channel estimation information
QCL typeB	Doppler shift, doppler spread	Obtaining channel estimation information
QCL typeC	Doppler shift, average delay	Obtaining measurement information
QCL typeD	Spatial reception (Rx) parameters	Auxiliary beamforming

TABLE 1

For the configuration of the TCI state, the following table 2 gives the configuration content, wherein TCI-StateId is the TCI state identifier, and QCL-Info is the QCL information.

TABLE 2

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 an SSB or CSI-RS resource through the TCI state, and the QCL type is configured to be QCL type a, QCL typeB or QCL type c, the terminal device may assume that the large-scale parameters of the target downlink signal and the SSB or 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 an SSB or CSI-RS resource through the TCI state and the QCL type is configured to be QCL typeD, the terminal device may receive the target downlink signal by using the same receiving beam as that used for receiving the reference SSB or reference CSI-RS resource. Typically, the target downlink channel (or downlink signal) and the associated SSB or CSI-RS resources 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 RRC signaling or by RRC signaling plus MAC signaling.

For the downlink data channel, as shown in fig. 7, the available TCI state set is indicated by RRC signaling (e.g., N candidate TCI states are indicated by RRC signaling, N is a positive integer), part of the TCI states are activated by MAC signaling (e.g., K TCI states in the N TCI states are activated by MAC signaling, K is a positive integer greater than or equal to 1 and less than or equal to N), and finally one or two TCI states are indicated from the activated TCI states by a TCI state indication field in the DCI for PDSCH of the DCI schedule. The case of 2 TCI states is mainly for multiple TRP-like scenarios.

In the downlink transmission system, PDCCH and PDSCH may be time-division transmitted, e.g., PDCCH and PDSCH scheduled by the PDCCH are located in different time slots, and the transmission beam used for PDSCH is indicated by DCI scheduled by the PDSCH. And the terminal equipment acquires the indicated beam information by detecting the DCI, namely, the beam information of the PDSCH scheduled by the DCI can be determined, so that corresponding data receiving can be performed.

In order to increase the transmission rate of the sidestream transmission system, it is considered to use the millimeter wave band in the sidestream transmission system, and in the sidestream millimeter wave transmission system, it is necessary to determine an optimal transmission beam of the transmitting end and/or an optimal reception beam of the receiving end. In determining the optimal transmit beam at the transmitting end, as shown in fig. 8, the following manner is generally adopted: the transmitting end uses different beams to alternately transmit the sideline CSI-RS (fig. 8 uses 4 beams to alternately transmit the sideline CSI-RS as an example), the different transmitting beams correspond to different sideline CSI-RS resources, the receiving end uses the same beam (fig. 8 uses beam 2 as an example) to respectively receive a plurality of sideline CSI-RS transmitted by the transmitting end, and the detected sideline CSI-RS are measured. As a way, the receiving end may select an optimal sidelink CSI-RS (e.g., the sidelink CSI-RS with the best signal quality) according to the measurement result of the sidelink CSI-RS, and feed back the corresponding sidelink CSI-RS resource identifier to the transmitting end, where the transmitting beam corresponding to the sidelink CSI-RS resource is the transmitting beam optimal for the receiving end. As another way, the receiving end reports the side CSI-RS resource identifiers of the plurality of side CSI-RS and the corresponding measurement results thereof to the transmitting end, and the transmitting end selects an optimal side CSI-RS (e.g., the side CSI-RS with the best signal quality) from the plurality of side CSI-RS according to the reported information, and uses a transmitting beam corresponding to the corresponding side CSI-RS resource as the transmitting beam optimal for the receiving end. Here, when the receiving end feeds back the related information of the plurality of sideline CSI-RS to the transmitting end, the transmitting end may consider that the transmission beams corresponding to the plurality of sideline CSI-RS are all available transmission beams. Then, the transmitting end informs the receiving end of the target transmitting beam, for example, indicates a TCI state to the receiving end, the QCL reference signal of the TCI state is the target sidelink CSI-RS, and the QCL type is QCL TypeD. The receiving end obtains the target sending beam according to the TCI state, and the receiving beam corresponding to the target sending beam can be used for receiving the sidestream data sent by the sending end. Further, if the transmitting end can judge that the beam fails, the transmitting end may reselect the transmitting beam, and optionally, the transmitting end may select, from the plurality of sidelink CSI-RSs, other sidelink CSI-RSs except the target sidelink CSI-RS as a new target sidelink CSI-RS, and use the corresponding transmitting beam as a new target transmitting beam.

In the above scheme, the transmitting end may indicate the corresponding relationship between the reference signal and the transmitting beam to the receiving end by configuring the TCI state. The configuration of the TCI state may include the following configurations: a TCI status identifier for indicating or identifying a TCI status; QCL information. Wherein, the QCL information further comprises the following information:

The QCL reference signal configuration includes a cell identifier where a reference signal is located, a BWP identifier, and an identifier of the reference signal, where the reference signal may include at least one of the following: side-row CSI-RS, PSCCH DMRS, PSSCH DMRS, PT-RS.

The above four QCL types may be defined as shown in the foregoing table 1, where QCL typeD indicates that the receiving end receives using the same spatial reception parameters (or spatial reception filters) as the reference signal associated with receiving the QCL type; or indicates that the transmitting end transmits using the same spatial transmission parameters (or spatial transmission filters) as the reference signal associated with the QCL type.

When the transmitting end selects the transmitting beam, the information needs to be transmitted to the receiving end so as to assist the receiving end to perform correct data receiving. However, in the side-row transmission system, the PSCCH and the pscsch scheduled by the PSCCH are located in the same time slot, and when detecting the PSCCH and the pscsch, the receiving end needs to first receive the data in the time slot, then perform PSCCH detection, and then perform pscsch detection. The receiving end cannot know the beam information used by the transmitting end before detecting the PSCCH, and cannot determine the corresponding receiving beam to receive, at this time, how the transmitting end indicates the transmitting beam is a problem to be solved. In addition, before the transmitting end selects the transmitting beam, how to perform side communication with the receiving end, or how to determine the transmitting beam used by the transmitting end is also a problem to be solved. For this reason, the following technical solutions of the embodiments of the present application are provided.

It should be noted that the technical solution of the embodiment of the present application may be applied to a sidestream transmission system.

In order to facilitate understanding of the technical solution of the embodiments of the present application, the technical solution of the present application is described in detail below through specific embodiments. The above 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.

It should be noted that, in the embodiment of the present application, the description of the "spatial transmission filter" may be replaced by the "transmission beam" or the "spatial transmission parameter", the description of the "spatial reception filter" may be replaced by the "reception beam" or the "spatial reception parameter", and the "spatial transmission filter" may include the "spatial transmission filter" and/or the "post-spatial reception filter".

Fig. 9 is a schematic flow chart of a side transmission method according to an embodiment of the present application, as shown in fig. 9, where the side transmission method includes the following steps:

Step 901: the first terminal device uses a first default spatial domain transmission filter to transmit a first sidelink transmission to the second terminal device, and/or uses a first default spatial domain reception filter to receive a second sidelink transmission transmitted by the second terminal device.

In the embodiment of the application, the first terminal equipment can use the first default airspace transmitting filter and/or the first default airspace receiving filter to carry out sidestream transmission with the second terminal equipment. In some alternative embodiments, the first default spatial transmit filter and the first default spatial receive filter have an association or correspondence that is embodied by: if the spatial transmission filter used by the first terminal device when transmitting is the first default spatial transmission filter, the spatial reception filter used by the first terminal device when receiving is the first default spatial reception filter. Or if the spatial reception filter used by the first terminal device when receiving is the first default spatial reception filter, the spatial transmission filter used by the first terminal device when transmitting is the first default spatial transmission filter.

The implementation of the first sidestream transfer and/or the second sidestream transfer is described below in connection with different schemes.

Scheme one

In the embodiment of the application, the first terminal equipment uses a first default airspace transmission filter to transmit a side uplink establishment request message to the second terminal equipment, wherein the side uplink establishment request message is used for requesting to establish a unicast link between the first terminal equipment and the second terminal equipment.

Further optionally, the first terminal device receives a sidelink setup accept message sent by the second terminal device by using a first default spatial domain receive filter, where the sidelink setup accept message is used to instruct the second terminal device to accept a sidelink setup request of the first terminal device; or the first terminal equipment uses a first default airspace receiving filter to receive a side-link establishment rejection message sent by the second terminal equipment, wherein the side-link establishment rejection message is used for indicating the second terminal equipment to reject a side-link establishment request of the first terminal equipment.

Scheme II

In the embodiment of the application, the first terminal equipment uses a first default airspace transmission filter to transmit a sidestream RRC reconfiguration message to the second terminal equipment, wherein the sidestream RRC reconfiguration message is used for reconfiguring sidestream RRC connection between the first terminal equipment and the second terminal equipment.

Further, optionally, the first terminal device uses a first default spatial domain receiving filter to receive a sidelink RRC reconfiguration complete message sent by the second terminal device, where the sidelink RRC reconfiguration complete message is used to indicate that sidelink RRC connection reconfiguration between the first terminal device and the second terminal device is completed; or the first terminal equipment receives a sidestream RRC reconfiguration failure message sent by the second terminal equipment by using a first default airspace receiving filter, wherein the sidestream RRC reconfiguration failure message is used for indicating that the sidestream RRC connection reconfiguration between the first terminal equipment and the second terminal equipment fails.

In some optional embodiments, if the first terminal device receives a sidelink RRC reconfiguration failure message, the first terminal device uses the first default airspace transmission filter to send a unicast link connection request message to the second terminal device, where the unicast link connection request message is used to request to reestablish a unicast link.

Scheme III

In the embodiment of the application, the first terminal equipment uses a first default airspace sending filter to send a first lateral transmission carrying first indication information to the second terminal equipment, wherein the first indication information is used for indicating to perform a selection process of the airspace sending filter of the first terminal equipment and/or a selection process of the airspace receiving filter of the second terminal equipment.

In the case 1) the first indication information indicates that the first terminal device uses a plurality of spatial domain transmission filters to transmit a reference signal to the second terminal device when the first indication information indicates to perform a selection process of the spatial domain transmission filters of the first terminal device; the first terminal equipment receives feedback information which is sent by the second terminal equipment and is measured for the reference signal; the first terminal device selects one airspace transmission filter from the airspace transmission filters as a target airspace transmission filter based on the feedback information, or determines the target airspace transmission filter based on the feedback information.

Here, the first terminal device is used as a transmitting end, the second terminal device is used as a receiving end, and the first terminal device uses a plurality of spatial domain transmitting filters to transmit reference signals to the second terminal device; the second terminal equipment receives the reference signal by using the same spatial domain receiving filter and measures the reference signal, and sends feedback information for reference signal measurement to the first terminal equipment; the first terminal device selects one airspace transmission filter from a plurality of airspace transmission filters as a target airspace transmission filter based on the feedback information, or determines the target airspace transmission filter based on the feedback information. Optionally, the first terminal device may receive the feedback information sent by the second terminal device using the first default spatial domain receive filter.

In the above scheme, optionally, the reference signal is a sidelink CSI-RS. It should be noted that the reference signal is not limited to the sidelink CSI-RS, but may be other types of signals, such as sidelink SSB.

Taking the reference signal as a sidelink CSI-RS as an example, as shown in fig. 8, a transmitting end (i.e. a first terminal device) uses 4 different transmitting beams (i.e. airspace transmitting filters) to transmit the sidelink CSI-RS in turn, the different transmitting beams correspond to different sidelink CSI-RS resources, a receiving end (i.e. a second terminal device) uses a beam 2 (i.e. airspace receiving filters) to respectively receive a plurality of sidelink CSI-RS transmitted by the transmitting end, and the detected sidelink CSI-RS are measured. As a way, the receiving end may select an optimal sidelink CSI-RS (e.g., the sidelink CSI-RS with the best signal quality) according to the measurement result of the sidelink CSI-RS, and report feedback information (e.g., including the sidelink CSI-RS resource identifier corresponding to the optimal sidelink CSI-RS and the corresponding measurement result) to the transmitting end, and the transmitting end may determine, according to the feedback information, that the transmitting beam corresponding to the sidelink CSI-RS resource is the transmitting beam (i.e., the target airspace transmitting filter) that is optimal for the receiving end. As another way, the receiving end reports feedback information (including the side CSI-RS resource identifiers of the plurality of side CSI-RS and corresponding measurement results thereof) to the transmitting end, and the transmitting end selects an optimal side CSI-RS (such as the side CSI-RS with the best signal quality) from the plurality of side CSI-RS according to the feedback information, and determines that a transmitting beam corresponding to the side CSI-RS resource of the side CSI-RS is the transmitting beam (i.e., the target airspace transmitting filter) optimal to the receiving end.

In case 2) the first indication information indicates that the selection process of the spatial domain receiving filter of the second terminal device is performed, the first terminal device uses the same spatial domain transmitting filter to transmit a reference signal to the second terminal device, the reference signal is received and measured by the second terminal device using a plurality of spatial domain receiving filters, and the measurement result of the reference signal is used for the second terminal device to select one spatial domain receiving filter from the plurality of spatial domain receiving filters as a target spatial domain receiving filter.

Here, the process of selecting the target spatial domain receiving filter by the second terminal device is similar to the process of selecting the target spatial domain transmitting filter by the first terminal device, and can be understood with reference to the process of selecting the target spatial domain transmitting filter by the first terminal device.

Scheme IV

In the embodiment of the application, the first terminal equipment uses a first default airspace transmission filter to send a first lateral transmission carrying second indication information to the second terminal equipment, wherein the second indication information is used for determining a target airspace transmission filter selected by the first terminal equipment, or the second indication information is used for indicating the first terminal equipment to use the target airspace transmission filter to carry out lateral transmission after a first time.

In some alternative embodiments, the first time is determined based on a first time period, the first time period is determined according to predefined information, or the first time period is determined according to preconfigured information, or the first time period is determined according to network configuration information, or the first time period is determined according to third indication information sent by the first terminal device.

For example, the first duration is specified by the protocol to be a duration corresponding to 4 time domain symbols at 15kHz subcarrier spacing. For another example, the indication information is included in a preconfigured or network configured resource pool parameter, the indication information being used to configure the first time period. For another example, the first terminal device sends third indication information to the second terminal device, where the third indication information is used to indicate that the first time length is 2 slots.

In some embodiments, the first terminal device sends the second indication information and the third indication information simultaneously, that is, the second indication information and the third indication information are included in the first side transmission.

In some embodiments, the third indication information is carried in SCI, MAC CE or PC5-RRC signaling. Further optionally, a second time is determined based on the end position of the first side line transmission, and a time interval between the first time and the second time is greater than or equal to the first time, and the second time is located before the first time. For example: the second moment is a moment corresponding to the end position of the first side line transmission, and the time interval between the first moment and the second moment is greater than or equal to the first duration.

In some embodiments, a second time is determined based on an end position of the first side-line transmission, and the first time is determined according to the second time and the first time, e.g., the first time is located after the second time and is greater than or equal to the first time in a time interval from the second time.

In some alternative embodiments, the first terminal device uses the first default spatial transmit filter for sidestream transmissions during a time interval between the first time instant and the second time instant.

Here, optionally, the end position of the first side line transmission may be defined as follows:

The end position of the first side line transmission corresponds to the end position of the time slot where the first side line transmission is located; or alternatively

The end position of the first sidelink transmission corresponds to the end position of the last time domain symbol occupied by the first sidelink transmission; or alternatively

The end position of the first sidelink transmission corresponds to the end position of the last time domain symbol occupied by the third sidelink transmission of the first sidelink transmission schedule.

As an alternative, if the second indication information is carried in the first-order SCI, the end position of the first side transmission corresponds to the end position of the last time domain symbol of the PSCCH or the end position of the last time domain symbol of the PSCCH scheduled PSCCH. Wherein the first order SCI is carried in the PSCCH.

As an alternative, if the second indication information is carried in the second-level SCI, the end position of the first side transmission corresponds to the end position of the last time domain symbol of the second-level SCI or the end position of the last time domain symbol of the PSCCH scheduled pscsch. Wherein the PSCCH is a PSCCH associated with the second order SCI, i.e. the PSCCH is transmitted simultaneously with the second order SCI and both carry parameters relating to the PSCCH.

As an optional case, if the second indication information is carried in a media access Control (MEDIA ACCESS Control, MAC) Control Element (CE), the end position of the first sidelink transmission corresponds to the end position of the last time domain symbol of the PSSCH carrying the MAC CE.

As an alternative, if the second indication information is carried in PC5-RRC signaling, the end position of the first side transmission corresponds to the end position of the last time domain symbol of the PSSCH carrying the PC5-RRC signaling.

In some alternative embodiments, if the second indication information is carried in the first-order SCI, the second-order SCI, or the MAC CE, the first terminal device activates sidestream feedback when sending the first sidestream transmission carrying the second indication information to the second terminal device.

Further optionally, the starting position of the first side line transmission is used for determining a second time, and a time interval between the first time and the second time is greater than or equal to the first time, and the second time is located before the first time. For example: the second moment is a moment corresponding to the starting position of the first side line transmission, and the time interval between the first moment and the second moment is greater than or equal to the first duration.

Here, alternatively, the starting position of the first side line transmission may be defined as follows:

the starting position of the first side line transmission corresponds to the starting position of the time slot where the first side line transmission is located; or alternatively

The starting position of the first side transmission corresponds to the starting position of a first time domain symbol of the first side transmission; or alternatively

The starting position of the first sidelink transmission corresponds to the starting position of a first time domain symbol of a third sidelink transmission of the first sidelink transmission schedule.

In some alternative embodiments, the first terminal device sends a first side-line transmission carrying second indication information to the second terminal device using a first default spatial domain sending filter in case the first terminal device determines that the current beam is invalid.

In some embodiments, the first terminal device determines that beam switching is required when the current beam (denoted as a first beam) fails, and selects a new available beam (denoted as a second beam), where the first terminal device needs to send second indication information to the second terminal device, where the second indication information carries indication information of the second beam; since the first beam is disabled, the first terminal device cannot use the first beam for sidelink transmission, and when transmitting the second instruction information, the first default transmission beam can be used to transmit the second instruction information.

Here, optionally, the determining, by the first terminal device, that the current beam is invalid may be implemented by: the first terminal equipment receives fourth indication information sent by the second terminal equipment through a first default airspace receiving filter, wherein the fourth indication information is used for indicating the current beam failure; and the first terminal equipment determines that the current beam fails based on the fourth indication information.

Scheme five

In the embodiment of the application, under the condition that the first terminal equipment determines that the current unicast link fails, a first default airspace sending filter is used for sending a unicast link connection request message to the second terminal equipment, wherein the unicast link connection request message is used for requesting to establish a unicast link.

It should be noted that, the first to fifth embodiments may be implemented independently, or may be implemented by combining two or more embodiments.

In the embodiment of the present application, the first default airspace transmitting filter and/or the first default airspace receiving filter may be understood as an airspace transmitting filter and/or an airspace receiving filter that are used by default (i.e. default) by the first terminal device; or the first default airspace transmitting filter and/or the first default airspace receiving filter is an airspace transmitting filter and/or an airspace receiving filter used before the first terminal device and the second terminal device establish a unicast link or after a unicast link fails (i.e. a wireless link fails (Radio Link Failure, RLF)); or the first default airspace transmitting filter and/or the first default airspace receiving filter are airspace transmitting filters and/or airspace receiving filters used when the first terminal device and the second terminal device perform sidestream RRC reconfiguration; or the first default spatial domain transmission filter is a spatial domain transmission filter used before the first terminal device obtains an optimal transmission beam (i.e., a target spatial domain transmission filter); or the first default airspace transmission filter is an airspace transmission filter used when the first terminal device transmits indication information for indicating to start a transmission beam selection process or a reception beam selection process; or the first default airspace transmission filter is an airspace transmission filter used when the first terminal device transmits indication information for indicating the selected target airspace transmission filter; or the first default airspace transmission filter is an airspace transmission filter used under the condition that the target airspace transmission filter selected by the first terminal device through the beam selection process has beam failure; or the first default spatial domain transmission filter is a spatial domain transmission filter used when the first terminal device transmits indication information for indicating beam switching.

In some embodiments, the first default spatial transmission filter is determined according to a spatial transmission filter used when the first terminal device performs broadcast communication; the first default airspace receiving filter is determined according to the airspace receiving filter used when the first terminal device receives the sidestream data sent by other terminal devices in a broadcast communication mode.

This will be described below.

In some alternative embodiments, the first default spatial transmit filter and/or the first default spatial receive filter corresponds to a first default TCI state; or the first default spatial transmit filter and/or the first default spatial receive filter corresponds to a first default sidelink CSI-RS resource.

In some alternative embodiments, the first default spatial transmit filter and/or the first default spatial receive filter is determined based on at least one of predefined information, pre-configuration information, network configuration information.

In some alternative embodiments, the first default spatial domain transmit filter and/or the first default spatial domain receive filter are determined based on fifth indication information configured by the first terminal device or the second terminal device, the fifth indication information being used to indicate the first default spatial domain transmit filter and/or the first default spatial domain receive filter. Here, optionally, the fifth indication information is carried in SCI, or MAC CE, or PC5-RRC signaling.

For determining the first default spatial transmit filter and/or the first default spatial receive filter according to predefined information, for example: the protocol specifies the following predefined information: the first terminal device uses a specific beam (i.e., a first default spatial transmit filter) for sidelink transmission before acquiring an optimal transmit beam (i.e., a target spatial transmit filter). The specific beam is the same as the transmission beam when the first terminal device broadcasts, or the specific beam is the transmission beam corresponding to the mode that the terminal adopts omni-directional transmission.

For determining the first default spatial transmit filter and/or the first default spatial receive filter based on pre-configuration information or network configuration information, for example: the resource pool configuration information includes an indication information for determining beam information (i.e., information of a first default spatial transmission filter) used by the first terminal device before acquiring the optimal transmission beam (i.e., the target spatial transmission filter), or for determining beam information (i.e., information of the first default spatial transmission filter) used by the first terminal device when transmitting information indicating the optimal transmission beam.

Determining the first default spatial transmit filter and/or the first default spatial receive filter for fifth indication information configured according to the first terminal device or the second terminal device, e.g.: an indication information is interacted between the first terminal device and the second terminal device through PC5-RRC signaling, and the indication information is used to determine beam information (i.e., information of the first default spatial domain transmission filter) used by the first terminal device when transmitting information indicating an optimal transmission beam. Also for example: when the first terminal configures the TCI state to the second terminal device, indicating that the airspace transmission filter corresponding to one TCI state is the first default airspace transmission filter at the same time, namely, when the first terminal device indicates to transmit beam information, the airspace transmission filter used by the indication information is the first default airspace transmission filter.

In some alternative embodiments, the first terminal device uses a second default spatial transmit filter and/or a second default spatial receive filter for sidestream transmissions before the fifth indication information is configured. Here, optionally, the second default spatial transmit filter and/or the second default spatial receive filter is determined based on at least one of predefined information, pre-configuration information, network configuration information. Based on this, option a) if the unicast link between the first terminal device and the second terminal device is valid: a-1) if the first terminal device configures the first default airspace transmitting filter and/or the first default airspace receiving filter to the second terminal device through the fifth indication information, the first terminal device uses the first default airspace transmitting filter and/or the first default airspace receiving filter to perform sidestream transmission; and A-2) if the first terminal equipment does not configure the first default airspace sending filter and/or the first default airspace receiving filter to the second terminal equipment through the fifth indication information, the first terminal equipment uses the second default airspace sending filter and/or the second default airspace receiving filter to perform sidestream transmission. Option B) if the unicast link between the first terminal device and the second terminal device is not valid,

And the first terminal equipment uses the second default airspace transmitting filter and/or the second default airspace receiving filter to carry out sidestream transmission.

According to the technical scheme provided by the embodiment of the application, the default airspace transmission filter (the default airspace transmission filter and/or the default airspace receiving filter) is utilized to carry out sidestream transmission in a sidestream transmission system, so that normal sidestream communication between the first terminal equipment and the second terminal equipment can be realized.

Fig. 10 is a second flow chart of a side transmission method according to an embodiment of the present application, as shown in fig. 10, where the side transmission method includes the following steps:

Step 1001: the second terminal device receives the first sidestream transmission sent by the first terminal device by using a third default airspace receiving filter, and/or sends the second sidestream transmission to the first terminal device by using a third default airspace sending filter.

In the embodiment of the application, the second terminal equipment can use the third default airspace receiving filter and/or the third default airspace transmitting filter to carry out sidestream transmission with the first terminal equipment. In some alternative embodiments, the third default spatial reception filter and the third default spatial transmission filter have an association or correspondence that is embodied in: if the spatial reception filter used by the second terminal device during reception is the third default spatial reception filter, the spatial transmission filter used by the second terminal device during transmission is the third default spatial transmission filter. Or if the spatial transmission filter used by the second terminal device when transmitting is the third default spatial transmission filter, the spatial reception filter used by the second terminal device when receiving is the third default spatial reception filter.

Scheme one

In the embodiment of the application, the second terminal equipment uses a third default airspace receiving filter to receive a side-link establishment request message sent by the first terminal equipment, wherein the side-link establishment request message is used for requesting to establish a unicast link between the first terminal equipment and the second terminal equipment.

Further optionally, the second terminal device uses a third default spatial domain transmission filter to send a side uplink establishment acceptance message to the first terminal device, where the side uplink establishment acceptance message is used to instruct the second terminal device to accept a side uplink establishment request of the first terminal device; or the second terminal equipment uses a third default airspace transmission filter to transmit a side-link establishment rejection message to the first terminal equipment, wherein the side-link establishment rejection message is used for indicating the second terminal equipment to reject the side-link establishment request of the first terminal equipment.

Scheme II

In the embodiment of the application, the second terminal equipment uses a third default airspace receiving filter to receive a sidestream RRC reconfiguration message sent by the first terminal equipment, wherein the sidestream RRC reconfiguration message is used for reconfiguring sidestream RRC connection between the first terminal equipment and the second terminal equipment.

Further, optionally, the second terminal device uses a third default spatial domain transmission filter to send a sidelink RRC reconfiguration complete message to the first terminal device, where the sidelink RRC reconfiguration complete message is used to indicate that the sidelink RRC connection reconfiguration between the first terminal device and the second terminal device is completed; or the second terminal equipment uses a third default airspace transmission filter to transmit a sidestream RRC reconfiguration failure message to the first terminal equipment, wherein the sidestream RRC reconfiguration failure message is used for indicating that the sidestream RRC connection reconfiguration between the first terminal equipment and the second terminal equipment fails.

In some optional embodiments, in a case that the second terminal device uses a third default spatial domain transmission filter to send a side RRC reconfiguration failure message to the first terminal device, the second terminal device uses a third default spatial domain reception filter to receive a unicast link connection request message sent by the first terminal device, where the unicast link connection request message is used to request to reestablish a unicast link.

Scheme III

In the embodiment of the application, the second terminal equipment uses a third default airspace receiving filter to receive a first lateral transmission carrying first indication information sent by the first terminal equipment, wherein the first indication information is used for indicating to perform a selection process of an airspace sending filter of the first terminal equipment and/or a selection process of an airspace receiving filter of the second terminal equipment.

In the case 1) that the first indication information indicates to perform a selection process of the spatial domain transmission filter of the first terminal device, the second terminal device receives reference signals sent by the first terminal device by using a plurality of spatial domain transmission filters, and measures the reference signals; the second terminal device sends feedback information for the reference signal measurement to the first terminal device, wherein the feedback information is used for the first terminal device to select one airspace sending filter from the airspace sending filters as a target airspace sending filter or used for the first terminal device to determine the target airspace sending filter.

2) Under the condition that the first indication information indicates to perform the selection process of the spatial domain receiving filter of the second terminal equipment, the second terminal equipment uses a plurality of spatial domain receiving filters to receive the test signal sent by the first terminal equipment, and measures the reference signal; and the second terminal equipment selects one spatial receiving filter from the plurality of spatial receiving filters as a target spatial receiving filter based on the measurement result of the reference signal.

Scheme IV

In the embodiment of the application, the second terminal device uses a third default airspace receiving filter to receive the first lateral transmission carrying the second indication information sent by the first terminal device, where the second indication information is used to determine the target airspace sending filter selected by the first terminal device, or the second indication information is used to instruct the first terminal device to use the target airspace sending filter to perform lateral transmission after the first time.

In some embodiments, the third indication information is carried in SCI, MAC CE or PC5-RRC signaling.

Further optionally, the second terminal device determines a second time based on the end position of the first side line transmission, where a time interval between the first time and the second time is greater than or equal to the first time, and the second time is before the first time. For example: the second moment is a moment corresponding to the end position of the first side line transmission, and the time interval between the first moment and the second moment is greater than or equal to the first duration.

In some alternative embodiments, the second terminal device uses the third default spatial domain receive filter for sidestream transmissions during a time interval between the first time instant and the second time instant.

As an alternative case, if the second indication information is carried in the MAC CE, the end position of the first side transmission corresponds to the end position of the last time domain symbol of the PSSCH carrying the MAC CE.

In some alternative embodiments, if the second indication information is carried in the first order SCI, second order SCI or MAC CE,

And the second terminal equipment receives the first lateral feedback carrying the second indication information sent by the first terminal equipment and activates the lateral feedback when the first lateral transmission is carried out.

In some alternative embodiments, in the case of the current beam failure, the second terminal device uses a third default spatial domain receiving filter to receive the first side-line transmission carrying the second indication information sent by the first terminal device.

Here, optionally, the second terminal device uses a third default spatial domain transmission filter to send fourth indication information to the first terminal device, where the fourth indication information is used to indicate that the current beam fails.

In some embodiments, when the second terminal device determines that the current beam (denoted as the third beam) fails, the second terminal device cannot use the third beam for side-line transmission due to the failure of the third beam, and may use the third default receiving beam to receive the second indication information when receiving the second indication information.

Scheme five

In the embodiment of the application, under the condition that the unicast link fails, the second terminal equipment uses a third default airspace receiving filter to receive a unicast link connection request message sent by the first terminal equipment, wherein the unicast link connection request message is used for requesting to establish the unicast link.

In the embodiment of the present application, the third default airspace receiving filter and/or the third default airspace sending filter may be understood as an airspace receiving filter and/or an airspace sending filter that are used by default (i.e. default) by the second terminal device; or the third default spatial domain receiving filter and/or the third default spatial domain transmitting filter is a spatial domain transmitting filter and/or a spatial domain receiving filter used before or after the second terminal device and the first terminal device establish a unicast link or after a unicast link failure (i.e. wireless link failure (Radio Link Failure, RLF)); or the third default airspace receiving filter and/or the third default airspace transmitting filter is/are an airspace transmitting filter and/or an airspace receiving filter used when the second terminal device and the first terminal device perform sidestream RRC reconfiguration; or the third default spatial reception filter is a spatial reception filter used before the second terminal device obtains an optimal reception beam (i.e., a target spatial reception filter); or the third default spatial domain receiving filter is a spatial domain receiving filter used when the second terminal equipment receives indication information for indicating to start a transmission beam selection process or a reception beam selection process; or the third default airspace receiving filter is an airspace receiving filter used when the second terminal device receives the indication information for indicating the selected target airspace transmitting filter; or the third default airspace receiving filter is an airspace receiving filter used under the condition that the target airspace receiving filter selected by the second terminal device through the beam selection process has beam failure; or the third default spatial reception filter is a spatial reception filter used when the second terminal device receives the indication information for indicating beam switching.

In some embodiments, the third default spatial transmission filter is determined according to a spatial transmission filter used when the second terminal device performs broadcast communication; and the third default airspace receiving filter is determined according to the airspace receiving filter used when the second terminal equipment receives the sidestream data sent by other terminal equipment in a broadcast communication mode.

This will be described below.

In some alternative embodiments, the third default spatial transmit filter and/or the third default spatial receive filter corresponds to a third default TCI state; or the third default spatial transmit filter and/or the third default spatial receive filter corresponds to a third default sidelink CSI-RS resource.

In some alternative embodiments, the third default spatial transmit filter and/or the third default spatial receive filter is determined based on at least one of predefined information, pre-configuration information, network configuration information.

In some alternative embodiments, the third default spatial domain transmission filter and/or the third default spatial domain reception filter are determined based on sixth indication information configured by the first terminal device or the second terminal device, where the sixth indication information is used to indicate the third default spatial domain transmission filter and/or the third default spatial domain reception filter. Here, optionally, the sixth indication information is carried in SCI, or MAC CE, or PC5-RRC signaling.

In some alternative embodiments, before the sixth indication information is configured, the second terminal device performs sidestream transmission using a fourth default spatial domain transmit filter and/or a fourth default spatial domain receive filter. Here, optionally, the fourth default spatial transmit filter and/or the fourth default spatial receive filter is determined based on at least one of predefined information, pre-configuration information, network configuration information. Based on this, option I) if the unicast link between the second terminal device and the first terminal device is valid: i-1) if the second terminal equipment configures the third default airspace sending filter and/or the third default airspace receiving filter for the second terminal equipment through the sixth indication information, the first terminal equipment uses the third default airspace sending filter and/or the third default airspace receiving filter to perform sidestream transmission; i-2) if the first terminal equipment does not configure the third default airspace sending filter and/or the third default airspace receiving filter for the second terminal equipment through the sixth indication information, the first terminal equipment uses the fourth default airspace sending filter and/or the fourth default airspace receiving filter to perform sidestream transmission. And II) if the unicast link between the second terminal equipment and the first terminal equipment is invalid, the second terminal equipment uses the fourth default airspace transmitting filter and/or the fourth default airspace receiving filter to carry out sidestream transmission.

The following describes the technical scheme of the embodiment of the present application with reference to specific application examples. The following application examples are described with respect to beams, and the description of "beams" may be replaced with "spatial transmission filters", for example, the description of "transmission beams" may be replaced with "spatial transmission filters", and the description of "reception beams" may be replaced with "spatial reception filters".

Application example 1

The first default beam is used for unicast link setup procedures or side-link RRC reconfiguration procedures by the first and second terminal devices.

In some alternative embodiments, the first terminal device and the second terminal device perform a unicast link establishment procedure, where the first terminal device has not selected an optimal transmit beam, and therefore, the first terminal device may perform a unicast link establishment procedure based on the first default beam. Specifically, a first terminal device uses a first default transmission beam to transmit a side uplink establishment request message to a second terminal device, where the side uplink establishment request message is used to request establishment of a unicast link between the first terminal device and the second terminal device; further optionally, the first terminal device receives a sidelink setup accept message or a sidelink setup reject message sent by the second terminal device using a first default reception beam, where the sidelink setup accept message is used to instruct the second terminal device to accept a sidelink setup request of the first terminal device, and the sidelink setup accept message is used to instruct the second terminal device to accept a sidelink setup request of the first terminal device. Optionally, the first default beam (e.g., the first default transmit beam and/or the first default receive beam) used in the unicast link establishment procedure is determined based on at least one of predefined information, pre-configuration information, network configuration information.

In some alternative embodiments, the first terminal device and the second terminal device perform a side-link RRC reconfiguration procedure, at which point the first terminal device may perform the side-link RRC reconfiguration procedure based on the first default beam. Specifically, a first terminal device uses a first default transmission beam to transmit a sidestream Radio Resource Control (RRC) reconfiguration message to a second terminal device, wherein the sidestream RRC reconfiguration message is used for reconfiguring sidestream RRC connection between the first terminal device and the second terminal device; further, optionally, the first terminal device receives a sideline RRC reconfiguration complete message or a sideline RRC reconfiguration failure message sent by the second terminal device by using a first default reception beam, where the sideline RRC reconfiguration complete message is used to indicate that the sideline RRC connection reconfiguration between the first terminal device and the second terminal device is completed, and the sideline RRC reconfiguration failure message is used to indicate that the sideline RRC connection reconfiguration between the first terminal device and the second terminal device fails. Optionally, the first default beam (e.g., the first default transmit beam and/or the first default receive beam) used in the unicast link establishment procedure is determined based on at least one of predefined information, pre-configuration information, network configuration information, or on indication information of the first terminal device or the second terminal device configuration.

Application instance two

The first default beam is used for the first terminal device to send first indication information, and the first indication information is used for indicating to trigger or start the beam selection process. The selection of the wave beam comprises the selection of a transmitting wave beam at the first terminal equipment side and/or the selection of a receiving wave beam at the second terminal equipment side.

When a first terminal device and a second terminal device establish a unicast link and need to select a wave beam, in the process of selecting a transmitting wave beam, the first terminal device uses a plurality of different transmitting wave beams to alternately transmit a sideline CSI-RS, the second terminal device uses the same receiving wave beam to receive and measure the sideline CSI-RS, and in the case, the first terminal device needs to send first indication information to the second terminal device in advance, wherein the first indication information is used for indicating the first terminal device to perform the process of selecting the transmitting wave beam, so that the second terminal device can use the same receiving wave beam to receive and measure; the first terminal device may transmit using a first default transmit beam when transmitting the first indication information. Similarly, in the process of selecting a receiving beam, the first terminal device uses the same transmitting beam to transmit the sideline CSI-RS, the second terminal device uses a plurality of different receiving beams to receive and measure the sideline CSI-RS, and for this case, the first terminal device also needs to send first indication information to the second terminal device in advance, where the first indication information is used to indicate that the first terminal device is about to perform the process of selecting the receiving beam, so that the second terminal device can use the plurality of different receiving beams to receive and measure the sideline CSI-RS; the first terminal device may transmit using a first default transmit beam when transmitting the first indication information.

Optionally, the first default beam (e.g. the first default transmit beam) used in the above procedure is determined based on at least one of predefined information, pre-configuration information, network configuration information, or on indication information of the first terminal device or the second terminal device configuration.

As shown in fig. 11, the procedure of selecting a transmission beam by a first terminal device, where the first terminal device sends first indication information to a second terminal device in time slot 0, where the first indication information is used to instruct the first terminal device to start a selection procedure of the transmission beam, and the first indication information is sent by using a first default transmission beam, for example, a default transmission beam configured by the first terminal device to the second terminal device in a unicast link establishment procedure of the first terminal device and the second terminal device. In time slots 3, 5, 6 and 8, the first terminal device uses different transmitting beams to transmit the sidelink CSI-RS respectively, the second terminal device measures the received sidelink CSI-RS, selects an optimal sidelink CSI-RS (such as the sidelink CSI-RS with the best signal quality), feeds back the corresponding resource information to the first terminal device, and the first terminal device can determine the optimal transmitting beam according to the transmitting beam corresponding to the sidelink CSI-RS resource.

Application example three

The first default beam is used for the first terminal device to send second indication information, and the second indication information is used for determining a target sending beam or is used for indicating the first terminal device to use the target sending beam for sidestream transmission after a first time.

Optionally, the first time is determined based on a first time period, the first time period is determined according to predefined information, or the first time period is determined according to preconfigured information, or the first time period is determined according to network configuration information, or the first time period is determined according to indication information sent by the first terminal device.

Optionally, the end position of the first side line transmission is used for determining a second time, and a time interval between the first time and the second time is greater than or equal to the first time, and the second time is located before the first time. Here, the first terminal device performs sidelink transmission during the time interval using the first default spatial transmit filter.

As an example, as shown in fig. 12, the second terminal device receives the second indication information sent by the first terminal device at the time slot a, and after a first time period after the end position (corresponding to the second time period) of the time slot a, the second terminal device considers that the first terminal device uses the target transmission beam indicated by the second indication information to send, and accordingly, the first terminal device uses the target transmission beam to send after the first time period, where the first time period is located after the second time period and is longer than or equal to the first time period from the second time period. The side transmissions corresponding to time slot c and time slot d in fig. 12 are transmitted using the target transmit beam, while the side transmission corresponding to time slot b in the figure is still transmitted using the first default beam after the end position of time slot a until the first time.

Optionally, the end position of the first sidelink transmission corresponds to the end position of the time slot in which the first sidelink transmission is located; or the end position of the first side line transmission corresponds to the end position of the last time domain symbol occupied by the first side line transmission; or the end position of the first sidelink transmission corresponds to the end position of the last time domain symbol occupied by the third sidelink transmission of the first sidelink transmission schedule.

Specifically, if the second indication information is carried in a first-order SCI, an end position of the first side transmission corresponds to an end position of a last time domain symbol of a PSCCH or corresponds to an end position of a last time domain symbol of a pscsch scheduled by the PSCCH, wherein the first-order SCI is carried in the PSCCH; if the second indication information is carried in the second-level SCI, the end position of the first side transmission corresponds to the end position of the last time domain symbol of the second-level SCI or corresponds to the end position of the last time domain symbol of the PSCCH scheduled pscsch; if the second indication information is carried in the MAC CE, the end position of the first side transmission corresponds to the end position of the last time domain symbol of the PSSCH carrying the MAC CE; if the second indication information is carried in the PC5-RRC signaling, the end position of the first side transmission corresponds to the end position of the last time domain symbol of the PSSCH carrying the PC5-RRC signaling.

Optionally, the second indication information is carried in SCI, MAC CE or PC5-RRC signaling.

Optionally, if the second indication information is carried in the first-stage SCI, the second-stage SCI, or the MAC CE, the first terminal device sends, to the second terminal device, the first side line feedback carrying the second indication information when the first side line is transmitted.

Alternatively, the first default beam and the target transmit beam may be the same transmit beam, or may be different transmit beams.

Application example four

And when the first terminal equipment detects beam failure or wireless link failure, the first default beam is used for lateral communication. Here, when the first terminal device detects that the beam fails or the wireless link fails, it indicates that the current transmission beam cannot meet the communication requirement, and beam switching needs to be performed or a unicast link needs to be reestablished, where the first terminal device may use the first default beam to perform side transmission.

In some optional embodiments, when the first terminal device detects that the beam fails, it indicates that the current transmission beam cannot meet the transmission requirement, and beam switching or beam reselection is required, at this time, the first terminal device may send second indication information using the first default beam, where the second indication information is used to determine the target transmission beam or is used to instruct the first terminal device to perform side-line transmission using the target transmission beam after the first moment. Here, the target transmit beam is the transmit beam that the first terminal device reselects.

In some alternative embodiments, when the first terminal device detects that the radio link has failed, indicating that the unicast link between the first terminal device and the second terminal device has failed, the unicast link needs to be re-established, at which point the first terminal device may send a unicast link connection request using the first default beam.

Application example five

When the first default wave beam is used for the first terminal equipment to receive the wave beam failure indication information sent by the second terminal equipment, the first default wave beam is used for carrying out sidestream communication; or when the first terminal device determines that the beam failure occurs, performing sidestream communication by using the first default beam.

In some embodiments, the second terminal device determines that the beam failure occurs, and sends indication information for indicating the beam failure to the first terminal device, where the first terminal device uses the first default beam to receive the indication information for indicating the beam failure sent by the second terminal device, and performs beam switching or beam reselection, where the first terminal device may use the first default beam to send second indication information, where the second indication information is used to determine the target transmission beam or is used to instruct the first terminal device to perform side transmission using the target transmission beam after the first time. Here, the target transmission beam is a transmission beam reselected by the first terminal device; or the first terminal device sends first indication information by using the first default beam, wherein the first indication information is used for indicating the first terminal device to start a sending beam selection process.

In some embodiments, the first terminal device determines that a beam failure has occurred, e.g., the first terminal device detects a discontinuous transmission (Discontinuous transmission, DTX) state N consecutive times, at which point the first terminal device sends second indication information using the first default beam, where the second indication information is used to determine the target transmit beam or is used to instruct the first terminal device to perform a sidelink transmission using the target transmit beam after the first time. Here, the target transmission beam is a transmission beam reselected by the first terminal device; or the first terminal device sends first indication information by using the first default beam, wherein the first indication information is used for indicating the first terminal device to start a sending beam selection process.

It should be noted that, in the above scheme of the embodiment of the present application, the side transmission performed by the first terminal device using the default beam may be one or more of the following channels or signal transmissions: PSCCH, PSSCH, PSCCH-DMRS, PSSCH-DMRS, sidestream CSI-RS, PT-RS.

The preferred embodiments of the present application have been described in detail above with reference to the accompanying drawings, but the present application is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present application within the scope of the technical concept of the present application, and all the simple modifications belong to the protection scope of the present application. For example, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further. As another example, any combination of the various embodiments of the present application may be made without departing from the spirit of the present application, which should also be regarded as the disclosure of the present application. For example, on the premise of no conflict, the embodiments described in the present application and/or technical features in the embodiments may be combined with any other embodiments in the prior art, and the technical solutions obtained after combination should also fall into the protection scope of the present application.

It should be further understood that, in the various method embodiments of the present application, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic of the processes, and should not constitute any limitation on the implementation process of the embodiments of the present application. Furthermore, in the embodiment of the present application, the terms "downstream", "upstream" and "sidestream" are used to indicate a transmission direction of signals or data, where "downstream" is used to indicate that the transmission direction of signals or data is a first direction from a station to a user equipment of a cell, and "upstream" is used to indicate that the transmission direction of signals or data is a second direction from the user equipment of the cell to the station, and "sidestream" is used to indicate that the transmission direction of signals or data is a third direction from the user equipment 1 to the user equipment 2. For example, "downstream signal" means that the transmission direction of the signal is the first direction. In addition, in the embodiment of the present application, the term "and/or" is merely an association relationship describing the association object, which means that three relationships may exist. Specifically, 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.

Fig. 13 is a schematic structural diagram of a side transmission device according to an embodiment of the present application, which is applied to a first terminal device, as shown in fig. 13, where the side transmission device includes:

a transmission unit 1301, configured to send a first sidelink transmission to a second terminal device using a first default spatial domain sending filter, and/or receive a second sidelink transmission sent by the second terminal device using a first default spatial domain receiving filter.

In some alternative embodiments, the transmitting unit 1301 is configured to send a side uplink setup request message to the second terminal device using the first default spatial domain sending filter, where the side uplink setup request message is used to request establishment of a unicast link between the first terminal device and the second terminal device.

In some optional embodiments, the transmitting unit 1301 is configured to receive, using a first default spatial domain receiving filter, a sidelink setup accept message sent by the second terminal device, where the sidelink setup accept message is used to instruct the second terminal device to accept the sidelink setup request of the first terminal device; or using a first default airspace receiving filter to receive a side-link establishment rejection message sent by the second terminal device, where the side-link establishment rejection message is used to instruct the second terminal device to reject the side-link establishment request of the first terminal device.

In some optional embodiments, the transmitting unit 1301 is configured to send a sidelink radio resource control RRC reconfiguration message to the second terminal device using the first default spatial domain transmission filter, where the sidelink RRC reconfiguration message is used to reconfigure a sidelink RRC connection between the first terminal device and the second terminal device.

In some optional embodiments, the transmitting unit 1301 is configured to receive a sidelink RRC reconfiguration complete message sent by the second terminal device using a first default spatial domain receiving filter, where the sidelink RRC reconfiguration complete message is used to indicate that sidelink RRC connection reconfiguration between the first terminal device and the second terminal device is complete; or receiving a sidestream RRC reconfiguration failure message sent by the second terminal equipment by using a first default airspace receiving filter, wherein the sidestream RRC reconfiguration failure message is used for indicating that the sidestream RRC connection reconfiguration between the first terminal equipment and the second terminal equipment fails.

In some optional embodiments, the transmitting unit 1301 is configured to send, if a sidelink RRC reconfiguration failure message is received, a unicast link connection request message to the second terminal device using the first default airspace sending filter, where the unicast link connection request message is used to request reestablishment of a unicast link.

In some optional embodiments, the transmission unit 1301 is configured to send, to a second terminal device, a first side transmission carrying first indication information by using a first default spatial domain sending filter, where the first indication information is used to indicate that a selection process of the spatial domain sending filter of the first terminal device and/or a selection process of the spatial domain receiving filter of the second terminal device are performed.

In some optional embodiments, when the first indication information indicates that the selection process of the spatial transmission filter of the first terminal device is performed, the transmission unit 1301 is further configured to send a reference signal to the second terminal device using a plurality of spatial transmission filters; receiving feedback information which is sent by the second terminal equipment and is measured for the reference signal;

The apparatus further comprises: a determining unit 1302, configured to select one spatial domain transmission filter from the plurality of spatial domain transmission filters as a target spatial domain transmission filter based on the feedback information, or determine the target spatial domain transmission filter based on the feedback information.

In some optional embodiments, in a case where the first indication information indicates that the selection process of the spatial domain receiving filter of the second terminal device is performed, the transmission unit 1301 is further configured to send, to the second terminal device, a reference signal using the same spatial domain sending filter, where the reference signal is received and measured by the second terminal device using a plurality of spatial domain receiving filters, and a measurement result of the reference signal is used by the second terminal device to select one spatial domain receiving filter from the plurality of spatial domain receiving filters as a target spatial domain receiving filter.

In some alternative embodiments, the reference signal is a sidelink CSI-RS.

In some optional embodiments, the transmitting unit 1301 is configured to send, to a second terminal device, a first side transmission carrying second indication information by using a first default spatial domain sending filter, where the second indication information is used to determine a target spatial domain sending filter selected by the first terminal device, or the second indication information is used to instruct the first terminal device to perform a side transmission by using the target spatial domain sending filter after a first time.

In some alternative embodiments, the end position of the first side line transmission is used to determine a second time, and a time interval between the first time and the second time is greater than or equal to the first time, and the second time is before the first time.

In some alternative embodiments, the first terminal device uses the first default spatial transmit filter for sidestream transmissions during the time interval.

In some alternative embodiments, the end position of the first sidelink transmission corresponds to the end position of the time slot in which the first sidelink transmission is located; or the end position of the first side line transmission corresponds to the end position of the last time domain symbol occupied by the first side line transmission; or the end position of the first sidelink transmission corresponds to the end position of the last time domain symbol occupied by the third sidelink transmission of the first sidelink transmission schedule.

In some alternative embodiments, if the second indication information is carried in the first-order SCI, the end position of the first sidelink transmission corresponds to the end position of the last time domain symbol of the PSCCH or corresponds to the end position of the last time domain symbol of the PSCCH scheduled PSCCH; if the second indication information is carried in the second-level SCI, the end position of the first side transmission corresponds to the end position of the last time domain symbol of the second-level SCI or corresponds to the end position of the last time domain symbol of the PSCCH scheduled pscsch; if the second indication information is carried in the MAC CE, the end position of the first side transmission corresponds to the end position of the last time domain symbol of the PSSCH carrying the MAC CE; if the second indication information is carried in the PC5-RRC signaling, the end position of the first side transmission corresponds to the end position of the last time domain symbol of the PSSCH carrying the PC5-RRC signaling; wherein the first order SCI is carried in the PSCCH.

In some alternative embodiments, if the second instruction information is carried in the first-stage SCI, the second-stage SCI, or the MAC CE, the transmission unit 1301 sends, to the second terminal device, the first side-line transmission that carries the second instruction information, and activates side-line feedback.

In some optional embodiments, the transmitting unit 1301 is configured to send, when determining that the current beam fails, a first side transmission carrying the second indication information to the second terminal device using a first default spatial domain sending filter.

In some optional embodiments, the transmission unit 1301 is further configured to receive, through a first default spatial domain receiving filter, fourth indication information sent by the second terminal device, where the fourth indication information is used to indicate that the current beam is invalid;

The determining unit 1302 is configured to determine that the current beam fails based on the fourth indication information.

In some optional embodiments, the transmitting unit 1301 is configured to send, when determining that the current unicast link fails, a unicast link connection request message to the second terminal device using the first default spatial domain sending filter, where the unicast link connection request message is used to request establishment of a unicast link.

In some alternative embodiments, the first default spatial domain transmit filter and/or the first default spatial domain receive filter are determined based on fifth indication information configured by the first terminal device or the second terminal device, the fifth indication information being used to indicate the first default spatial domain transmit filter and/or the first default spatial domain receive filter.

In some alternative embodiments, the fifth indication information is carried in SCI, or MAC CE, or PC5-RRC signaling.

In some alternative embodiments, the transmitting unit 1301 is further configured to perform side-line transmission using a second default spatial transmit filter and/or a second default spatial receive filter before the fifth indication information is configured.

In some alternative embodiments, the second default spatial transmit filter and/or the second default spatial receive filter is determined based on at least one of predefined information, pre-configuration information, network configuration information.

In some optional embodiments, the transmission unit 1301 is further configured to, if a unicast link between the first terminal device and the second terminal device is valid:

If the first terminal equipment configures the first default airspace sending filter and/or the first default airspace receiving filter to the second terminal equipment through the fifth indication information, using the first default airspace sending filter and/or the first default airspace receiving filter to perform sidestream transmission;

and if the first terminal equipment does not configure the first default airspace sending filter and/or the first default airspace receiving filter to the second terminal equipment through the fifth indication information, using the second default airspace sending filter and/or the second default airspace receiving filter to perform sidestream transmission.

In some optional embodiments, the transmission unit 1301 is further configured to use the second default spatial transmission filter and/or the second default spatial reception filter to perform side-line transmission if the unicast link between the first terminal device and the second terminal device is invalid.

It should be understood by those skilled in the art that the above description of the sidestream transport apparatus according to the embodiment of the present application may be understood with reference to the description of the sidestream transport method according to the embodiment of the present application.

Fig. 14 is a schematic diagram ii of the structural composition of a side-line transmission device according to an embodiment of the present application, which is applied to a second terminal device, as shown in fig. 14, where the side-line transmission device includes:

A transmission unit 1401 is configured to receive the first sidelink transmission sent by the first terminal device using a third default spatial domain receiving filter, and/or send the second sidelink transmission to the first terminal device using a third default spatial domain sending filter.

In some alternative embodiments, the transmitting unit 1401 is configured to receive, using a third default spatial domain receive filter, a side-link establishment request message sent by a first terminal device, where the side-link establishment request message is used to request establishment of a unicast link between the first terminal device and the second terminal device.

In some alternative embodiments, the transmitting unit 1401 is configured to send a side-link establishment acceptance message to the first terminal device using a third default spatial domain transmission filter, where the side-link establishment acceptance message is used to instruct the second terminal device to accept a side-link establishment request of the first terminal device; or using a third default spatial domain transmission filter to transmit a side-link establishment rejection message to the first terminal device, where the side-link establishment rejection message is used to instruct the second terminal device to reject the side-link establishment request of the first terminal device.

In some optional embodiments, the transmitting unit 1401 is configured to receive a sidelink RRC reconfiguration message sent by the first terminal device using a third default spatial domain receive filter, where the sidelink RRC reconfiguration message is used to reconfigure a sidelink RRC connection between the first terminal device and the second terminal device.

In some optional embodiments, the transmitting unit 1401 is configured to send a sidelink RRC reconfiguration complete message to the first terminal device using a third default spatial domain transmission filter, where the sidelink RRC reconfiguration complete message is used to indicate that the sidelink RRC connection reconfiguration between the first terminal device and the second terminal device is complete; or using a third default airspace transmission filter to transmit a sidestream RRC reconfiguration failure message to the first terminal equipment, wherein the sidestream RRC reconfiguration failure message is used for indicating that the sidestream RRC connection reconfiguration between the first terminal equipment and the second terminal equipment fails.

In some alternative embodiments, in a case where the second terminal device uses a third default spatial domain transmission filter to send a side RRC reconfiguration failure message to the first terminal device, the transmission unit 1401 receives, using a third default spatial domain reception filter, a unicast link connection request message sent by the first terminal device, where the unicast link connection request message is used to request to reestablish a unicast link.

In some optional embodiments, the transmission unit 1401 is configured to receive, using a third default spatial domain receive filter, a first side transmission sent by a first terminal device and carrying first indication information, where the first indication information is used to indicate that a selection process of a spatial domain transmit filter of the first terminal device and/or a selection process of a spatial domain receive filter of the second terminal device is performed.

In some optional embodiments, when the first indication information indicates that the selection process of the spatial domain transmission filter of the first terminal device is performed, the transmission unit 1401 is further configured to receive reference signals sent by the first terminal device using a plurality of spatial domain transmission filters, and measure the reference signals; and sending feedback information for the reference signal measurement to the first terminal equipment, wherein the feedback information is used for the first terminal equipment to select one airspace sending filter from the airspace sending filters as a target airspace sending filter or used for the first terminal equipment to determine the target airspace sending filter.

In some optional embodiments, when the first indication information indicates that the selection process of the spatial domain receiving filter of the second terminal device is performed, the transmission unit 1401 is further configured to receive the test signals sent by the first terminal device by using a plurality of spatial domain receiving filters, and measure the reference signals;

The apparatus further comprises: a determining unit 1402, configured to select one spatial reception filter from the plurality of spatial reception filters as a target spatial reception filter based on a measurement result of the reference signal.

In some alternative embodiments, the reference signal is a sidelink CSI-RS.

In some optional embodiments, the transmission unit 1401 is configured to receive, using a third default spatial domain receiving filter, a first side transmission sent by a first terminal device and carrying second indication information, where the second indication information is used to determine a target spatial domain sending filter selected by the first terminal device, or the second indication information is used to instruct the first terminal device to perform a side transmission using the target spatial domain sending filter after a first time.

In some alternative embodiments, the first terminal device uses the third default spatial reception filter for sidestream transmissions during the time interval.

In some alternative embodiments, the end position of the first sidelink transmission corresponds to the end position of the time slot in which the first sidelink transmission is located; or the end position of the first side line transmission corresponds to the end position of the last time domain symbol number occupied by the first side line transmission; or the end position of the first sidelink transmission corresponds to the end position of the last time domain symbol occupied by the third sidelink transmission of the first sidelink transmission schedule.

In some optional embodiments, if the second instruction information is carried in the first-order SCI, the second-order SCI, or the MAC CE, the second terminal device receives the first side feedback carrying the second instruction information sent by the first terminal device, and activates side feedback when the first side feedback carrying the second instruction information is transmitted.

In some optional embodiments, the transmission unit 1401 is configured to receive, in a case that the current beam fails, a first side transmission carrying the second indication information sent by the first terminal device using a third default spatial domain receiving filter.

In some alternative embodiments, the transmission unit 1401 is further configured to send fourth indication information to the first terminal device using a third default spatial domain sending filter, where the fourth indication information is used to indicate that the current beam is invalid.

In some optional embodiments, the transmission unit 1401 is configured to receive, in a case of a unicast link failure, a unicast link connection request message sent by the first terminal device, where the unicast link connection request message is used to request establishment of a unicast link, using a third default spatial domain receive filter.

In some alternative embodiments, the third default spatial domain transmission filter and/or the third default spatial domain reception filter are determined based on sixth indication information configured by the first terminal device or the second terminal device, where the sixth indication information is used to indicate the third default spatial domain transmission filter and/or the third default spatial domain reception filter.

In some alternative embodiments, the sixth indication information is carried in SCI, or MAC CE, or PC5-RRC signaling.

In some alternative embodiments, the transmitting unit 1401 is further configured to perform side-line transmission using a fourth default spatial transmit filter and/or a fourth default spatial receive filter before the sixth indication information is configured.

In some alternative embodiments, the fourth default spatial transmit filter and/or the fourth default spatial receive filter is determined based on at least one of predefined information, pre-configuration information, network configuration information.

In some alternative embodiments, the transmission unit 1401 is further configured to, if a unicast link between the second terminal device and the first terminal device is valid:

If the second terminal equipment configures the third default airspace sending filter and/or the third default airspace receiving filter to the second terminal equipment through the sixth indication information, using the third default airspace sending filter and/or the third default airspace receiving filter to perform sidestream transmission;

And if the first terminal equipment does not configure the third default airspace sending filter and/or the third default airspace receiving filter to the second terminal equipment through the sixth indication information, using the fourth default airspace sending filter and/or the fourth default airspace receiving filter to perform sidestream transmission.

In some alternative embodiments, the transmission unit 1401 is further configured to use the fourth default spatial transmit filter and/or the fourth default spatial receive filter to perform side-line transmission if the unicast link between the second terminal device and the first terminal device is invalid.

Fig. 15 is a schematic block diagram of a communication device 1500 according to an embodiment of the present application. The communication device may be a terminal device (e.g., a first terminal device, a second terminal device). The communication device 1500 shown in fig. 15 comprises a processor 1510, from which the processor 1510 can call and run a computer program to implement the method in an embodiment of the application.

Optionally, as shown in fig. 15, the communication device 1500 may also include a memory 1520. Wherein the processor 1510 may invoke and run a computer program from the memory 1520 to implement the method in embodiments of the present application.

Wherein the memory 1520 may be a separate device from the processor 1510 or may be integrated into the processor 1510.

Optionally, as shown in fig. 15, the communication device 1500 may further include a transceiver 1530, and the processor 1510 may control the transceiver 1530 to communicate with other devices, and in particular, may send information or data to other devices, or receive information or data sent by other devices.

Wherein the transceiver 1530 may include a transmitter and a receiver. The transceiver 1530 may further include an antenna, the number of which may be one or more.

The communication device 1500 may be specifically a first terminal device or a second terminal device in the embodiment of the present application, and the communication device 1500 may implement corresponding processes implemented by the first terminal device or the second terminal device in each method in the embodiment of the present application, which are not described herein for brevity.

Fig. 16 is a schematic structural view of a chip of an embodiment of the present application. The chip 1600 shown in fig. 16 includes a processor 1610, and the processor 1610 may call and execute a computer program from a memory to implement the method in an embodiment of the present application.

Optionally, as shown in fig. 16, the chip 1600 may also include a memory 1620. Wherein the processor 1610 may call and run a computer program from the memory 1620 to implement the method in an embodiment of the present application.

Wherein memory 1620 may be a separate device from processor 1610 or may be integrated within processor 1610.

Optionally, the chip 1600 may also include an input interface 1630. Wherein processor 1610 may control the input interface 1630 to communicate with other devices or chips, and in particular may obtain information or data sent by other devices or chips.

Optionally, the chip 1600 may also include an output interface 1640. Wherein processor 1610 may control the output interface 1640 to communicate with other devices or chips, and in particular may output information or data to other devices or chips.

The chip may be applied to the first terminal device or the second terminal device in the embodiment of the present application, and the chip may implement a corresponding flow implemented by the first terminal device or the second terminal device in each method in the embodiment of the present application, which is not described herein for brevity.

It should be understood that the chips referred to in the embodiments of the present application may also be referred to as system-on-chip chips, or the like.

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 (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 the method disclosed in connection with the embodiments of the present application may be embodied directly in the execution of a hardware decoding processor, or in the execution of a combination of hardware and software modules in a decoding 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 application may be 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 external cache memory. By way of example, and not limitation, many forms of RAM are available, such as static random access memory (STATIC RAM, SRAM), dynamic random access memory (DYNAMIC RAM, DRAM), synchronous Dynamic Random Access Memory (SDRAM), double data rate Synchronous dynamic random access memory (Double DATA RATE SDRAM, DDR SDRAM), enhanced Synchronous dynamic random access memory (ENHANCED SDRAM, ESDRAM), synchronous link dynamic random access memory (SYNCHLINK DRAM, SLDRAM), and Direct memory bus 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 appreciated that the above memory is exemplary and not limiting, and for example, the memory in the embodiments of the present application may be static random access memory (STATIC RAM, SRAM), dynamic random access memory (DYNAMIC RAM, DRAM), synchronous Dynamic Random Access Memory (SDRAM), double data rate synchronous dynamic random access memory (double DATA RATE SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (ENHANCED SDRAM, ESDRAM), synchronous connection dynamic random access memory (SYNCH LINK DRAM, SLDRAM), direct Rambus 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.

The embodiment of the application also provides a computer readable storage medium for storing a computer program. The computer readable storage medium may be applied to the first terminal device or the second terminal device in the embodiment of the present application, and the computer program causes a computer to execute corresponding processes implemented by the first terminal device or the second terminal device in the methods in the embodiments of the present application, which are not described herein for brevity.

The embodiment of the application also provides a computer program product comprising computer program instructions. The computer program product may be applied to the first terminal device or the second terminal device in the embodiment of the present application, and the computer program instructions cause the computer to execute the corresponding processes implemented by the first terminal device or the second terminal device in the methods in the embodiments of the present application, which are not described herein for brevity.

The embodiment of the application also provides a computer program. The computer program may be applied to the first terminal device or the second terminal device in the embodiment of the present application, and when the computer program runs on a computer, the computer is caused to execute corresponding processes implemented by the first terminal device or the second terminal device in each method of the embodiment of the present application, which are 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 by the present 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 the embodiments 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. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a usb 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 illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within 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 sidestream transport method, the method comprising:

The first terminal device uses a first default spatial domain transmission filter to transmit a first sidelink transmission to the second terminal device, and/or uses a first default spatial domain reception filter to receive a second sidelink transmission transmitted by the second terminal device.
The method of claim 1, wherein the first terminal device transmitting the first side-line transmission to the second terminal device using a first default spatial transmit filter comprises:

The first terminal device uses a first default spatial domain transmission filter to transmit a side-link establishment request message to a second terminal device, where the side-link establishment request message is used to request establishment of a unicast link between the first terminal device and the second terminal device.
The method of claim 2, wherein the receiving the second sidelink transmission sent by the second terminal device using the first default spatial reception filter comprises:

The first terminal equipment receives a side-link establishment acceptance message sent by the second terminal equipment by using a first default airspace receiving filter, wherein the side-link establishment acceptance message is used for indicating the second terminal equipment to accept a side-link establishment request of the first terminal equipment; or alternatively

The first terminal equipment uses a first default airspace receiving filter to receive a side-link establishment rejection message sent by the second terminal equipment, wherein the side-link establishment rejection message is used for indicating the second terminal equipment to reject a side-link establishment request of the first terminal equipment.
The method of claim 1, wherein the first terminal device transmitting the first side-line transmission to the second terminal device using a first default spatial transmit filter comprises:

And the first terminal equipment uses a first default airspace transmission filter to transmit a sidestream Radio Resource Control (RRC) reconfiguration message to the second terminal equipment, wherein the sidestream RRC reconfiguration message is used for reconfiguring sidestream RRC connection between the first terminal equipment and the second terminal equipment.
The method of claim 4, wherein the receiving the second sidelink transmission sent by the second terminal device using the first default spatial reception filter comprises:

The first terminal equipment receives a sidestream RRC reconfiguration complete message sent by the second terminal equipment by using a first default airspace receiving filter, wherein the sidestream RRC reconfiguration complete message is used for indicating completion of sidestream RRC connection reconfiguration between the first terminal equipment and the second terminal equipment; or alternatively

And the first terminal equipment uses a first default airspace receiving filter to receive a sidestream RRC reconfiguration failure message sent by the second terminal equipment, wherein the sidestream RRC reconfiguration failure message is used for indicating that the sidestream RRC connection reconfiguration between the first terminal equipment and the second terminal equipment fails.
The method of claim 5, wherein the method further comprises:

And if the first terminal equipment receives the sidelink RRC reconfiguration failure message, the first terminal equipment uses the first default airspace transmission filter to transmit a unicast link connection request message to the second terminal equipment, wherein the unicast link connection request message is used for requesting to reestablish a unicast link.
The method of claim 1, wherein the first terminal device transmitting the first side-line transmission to the second terminal device using a first default spatial transmit filter comprises:

The first terminal equipment uses a first default airspace sending filter to send a first lateral transmission carrying first indication information to the second terminal equipment, wherein the first indication information is used for indicating to perform a selection process of the airspace sending filter of the first terminal equipment and/or a selection process of the airspace receiving filter of the second terminal equipment.
The method of claim 7, wherein the method further comprises: in the case where the first indication information indicates that a selection process of the spatial transmission filter of the first terminal apparatus is performed,

The first terminal device sends a reference signal to the second terminal device by using a plurality of spatial domain sending filters;

the first terminal equipment receives feedback information which is sent by the second terminal equipment and is measured for the reference signal;

the first terminal device selects one airspace transmission filter from the airspace transmission filters as a target airspace transmission filter based on the feedback information, or determines the target airspace transmission filter based on the feedback information.
The method of claim 7, wherein the method further comprises: in case the first indication information indicates that a selection procedure of the spatial reception filter of the second terminal device is performed,

The first terminal equipment uses the same spatial domain sending filter to send a reference signal to the second terminal equipment, the reference signal is received and measured by the second terminal equipment by using a plurality of spatial domain receiving filters, and the measurement result of the reference signal is used for the second terminal equipment to select one spatial domain receiving filter from the plurality of spatial domain receiving filters as a target spatial domain receiving filter.
The method according to claim 8 or 9, wherein the reference signal is a sidelink channel state information-reference signal, CSI-RS.
The method of claim 1, wherein the first terminal device transmitting the first side-line transmission to the second terminal device using a first default spatial transmit filter comprises:

the first terminal equipment uses a first default airspace sending filter to send first lateral transmission carrying second indication information to the second terminal equipment, wherein the second indication information is used for determining a target airspace sending filter selected by the first terminal equipment, or the second indication information is used for indicating the first terminal equipment to use the target airspace sending filter to carry out lateral transmission after a first moment.
The method of claim 11, wherein the first time is determined based on a first time period, the first time period is determined according to predefined information, or the first time period is determined according to pre-configuration information, or the first time period is determined according to network configuration information, or the first time period is determined according to third indication information sent by the first terminal device.
The method of claim 12, wherein an end position of the first side line transmission is used to determine a second time, a time interval between the first time and the second time being greater than or equal to the first time, the second time being prior to the first time.
The method of claim 13, wherein the first terminal device uses the first default spatial transmit filter for sidestream transmissions during the time interval.
The method according to claim 13 or 14, wherein,

The end position of the first side line transmission corresponds to the end position of the time slot where the first side line transmission is located; or alternatively

The end position of the first sidelink transmission corresponds to the end position of the last time domain symbol occupied by the first sidelink transmission; or alternatively

The end position of the first sidelink transmission corresponds to the end position of the last time domain symbol occupied by the third sidelink transmission of the first sidelink transmission schedule.
The method according to any one of claims 13 to 15, wherein,

If the second indication information is carried in the first-order sidelink control information SCI, the end position of the first sidelink transmission corresponds to the end position of the last time domain symbol of the physical sidelink control channel PSCCH or corresponds to the end position of the last time domain symbol of the physical sidelink shared channel PSCCH scheduled by the PSCCH;

If the second indication information is carried in the second-level SCI, the end position of the first side transmission corresponds to the end position of the last time domain symbol of the second-level SCI or corresponds to the end position of the last time domain symbol of the PSCCH scheduled pscsch;

If the second indication information is carried in a Media Access Control (MAC) control unit (CE), the end position of the first side transmission corresponds to the end position of the last time domain symbol of the PSSCH carrying the MAC CE;

If the second indication information is carried in the PC5-RRC signaling, the end position of the first side transmission corresponds to the end position of the last time domain symbol of the PSSCH carrying the PC5-RRC signaling;

wherein the first order SCI is carried in the PSCCH.
The method according to any one of claims 11 to 16, wherein,

And if the second indication information is carried in the first-order SCI, the second-order SCI or the MAC CE, the first terminal equipment activates sidestream feedback when sending the first sidestream transmission carrying the second indication information to the second terminal equipment.
The method according to any of claims 11 to 17, wherein the first terminal device sending a first side-line transmission carrying second indication information to a second terminal device using a first default spatial domain send filter, comprising:

And under the condition that the first terminal equipment determines that the current wave beam fails, a first default airspace transmission filter is used for transmitting a first lateral transmission carrying second indication information to the second terminal equipment.
The method of claim 18, wherein the method further comprises:

The first terminal equipment receives fourth indication information sent by the second terminal equipment through a first default airspace receiving filter, wherein the fourth indication information is used for indicating the current beam failure;

the first terminal device determining that the current beam fails includes: and the first terminal equipment determines that the current beam fails based on the fourth indication information.
The method of claim 1, wherein the first terminal device transmitting the first side-line transmission to the second terminal device using a first default spatial transmit filter comprises:

and under the condition that the first terminal equipment determines that the current unicast link fails, a first default airspace sending filter is used for sending a unicast link connection request message to the second terminal equipment, wherein the unicast link connection request message is used for requesting to establish a unicast link.
The method according to any one of claims 1 to 20, wherein,

The first default spatial transmit filter and/or the first default spatial receive filter indicates a TCI state corresponding to a first default transmission configuration; or alternatively

The first default spatial transmit filter and/or the first default spatial receive filter corresponds to a first default sidelink CSI-RS resource.
The method of any of claims 1 to 21, wherein the first default spatial transmit filter and/or the first default spatial receive filter is determined based on at least one of predefined information, pre-configuration information, network configuration information.
The method of any one of claims 1 to 21, wherein the first default spatial transmit filter and/or the first default spatial receive filter is determined based on fifth indication information configured by the first terminal device or the second terminal device, the fifth indication information being used to indicate the first default spatial transmit filter and/or the first default spatial receive filter.
The method of claim 23, wherein the fifth indication information is carried in SCI, or MAC CE, or PC5-RRC signaling.
The method of claim 23 or 24, wherein the method further comprises:

before the fifth indication information is configured, the first terminal device uses a second default airspace transmitting filter and/or a second default airspace receiving filter to perform sidestream transmission.
The method of claim 25, wherein the second default spatial transmit filter and/or the second default spatial receive filter is determined based on at least one of predefined information, pre-configuration information, network configuration information.
The method of claim 25 or 26, wherein the method further comprises:

If the unicast link between the first terminal device and the second terminal device is valid, then:

If the first terminal device configures the first default airspace sending filter and/or the first default airspace receiving filter to the second terminal device through the fifth indication information, the first terminal device uses the first default airspace sending filter and/or the first default airspace receiving filter to perform sidestream transmission;

And if the first terminal equipment does not configure the first default airspace sending filter and/or the first default airspace receiving filter to the second terminal equipment through the fifth indication information, the first terminal equipment uses the second default airspace sending filter and/or the second default airspace receiving filter to carry out sidestream transmission.
The method of claim 25 or 26, wherein the method further comprises:

And if the unicast link between the first terminal equipment and the second terminal equipment is invalid, the first terminal equipment uses the second default airspace transmitting filter and/or the second default airspace receiving filter to carry out sidestream transmission.
A sidestream transport method, the method comprising:

The second terminal device receives the first sidestream transmission sent by the first terminal device by using a third default airspace receiving filter, and/or sends the second sidestream transmission to the first terminal device by using a third default airspace sending filter.
The method of claim 29, wherein the second terminal device receives the first side-line transmission sent by the first terminal device using a third default spatial reception filter, comprising:

The second terminal equipment uses a third default airspace receiving filter to receive a side-link establishment request message sent by the first terminal equipment, wherein the side-link establishment request message is used for requesting to establish a unicast link between the first terminal equipment and the second terminal equipment.
The method of claim 30, wherein the sending the second sidelink transmission to the first terminal device using a third default spatial transmit filter comprises:

The second terminal equipment uses a third default airspace transmission filter to transmit a side-link establishment acceptance message to the first terminal equipment, wherein the side-link establishment acceptance message is used for indicating the second terminal equipment to accept a side-link establishment request of the first terminal equipment; or alternatively

The second terminal device uses a third default spatial domain transmission filter to transmit a side-link establishment rejection message to the first terminal device, where the side-link establishment rejection message is used to instruct the second terminal device to reject a side-link establishment request of the first terminal device.
The method of claim 29, wherein the second terminal device receives the first side-line transmission sent by the first terminal device using a third default spatial reception filter, comprising:

And the second terminal equipment uses a third default airspace receiving filter to receive a sidestream RRC reconfiguration message sent by the first terminal equipment, wherein the sidestream RRC reconfiguration message is used for reconfiguring sidestream RRC connection between the first terminal equipment and the second terminal equipment.
The method of claim 32, wherein the sending the second sidelink transmission to the first terminal device using a third default spatial transmit filter comprises:

the second terminal equipment uses a third default airspace transmission filter to transmit a sidestream RRC reconfiguration completion message to the first terminal equipment, wherein the sidestream RRC reconfiguration completion message is used for indicating that sidestream RRC connection reconfiguration between the first terminal equipment and the second terminal equipment is completed; or alternatively

And the second terminal equipment uses a third default airspace transmission filter to transmit a sidestream RRC reconfiguration failure message to the first terminal equipment, wherein the sidestream RRC reconfiguration failure message is used for indicating that the sidestream RRC connection reconfiguration between the first terminal equipment and the second terminal equipment fails.
The method of claim 33, wherein in the case where the second terminal device sends a sidelink RRC reconfiguration failure message to the first terminal device using a third default spatial transmit filter, the method further comprises:

The second terminal device uses a third default airspace receiving filter to receive a unicast link connection request message sent by the first terminal device, where the unicast link connection request message is used to request to reestablish a unicast link.
The method of claim 29, wherein the second terminal device receives the first side-line transmission sent by the first terminal device using a third default spatial reception filter, comprising:

The second terminal device uses a third default airspace receiving filter to receive a first lateral transmission carrying first indication information sent by the first terminal device, where the first indication information is used to indicate a selection process of the airspace sending filter of the first terminal device and/or a selection process of the airspace receiving filter of the second terminal device.
The method of claim 35, wherein the method further comprises: in the case where the first indication information indicates that a selection process of the spatial transmission filter of the first terminal apparatus is performed,

The second terminal equipment receives the reference signals sent by the first terminal equipment by using a plurality of spatial domain sending filters, and measures the reference signals;

The second terminal device sends feedback information for the reference signal measurement to the first terminal device, wherein the feedback information is used for the first terminal device to select one airspace sending filter from the airspace sending filters as a target airspace sending filter or used for the first terminal device to determine the target airspace sending filter.
The method of claim 35, wherein the method further comprises: in case the first indication information indicates that a selection procedure of the spatial reception filter of the second terminal device is performed,

The second terminal equipment uses a plurality of spatial domain receiving filters to receive the test signals sent by the first terminal equipment and measures the reference signals;

And the second terminal equipment selects one spatial receiving filter from the plurality of spatial receiving filters as a target spatial receiving filter based on the measurement result of the reference signal.
The method of claim 36 or 37, wherein the reference signal is a sidelobe CSI-RS.
The method of claim 29, wherein the second terminal device receives the first side-line transmission sent by the first terminal device using a third default spatial reception filter, comprising:

The second terminal equipment uses a third default airspace receiving filter to receive first lateral transmission carrying second indication information sent by the first terminal equipment, wherein the second indication information is used for determining a target airspace sending filter selected by the first terminal equipment, or the second indication information is used for indicating the first terminal equipment to use the target airspace sending filter to carry out lateral transmission after a first moment.
The method of claim 39, wherein the first time is determined based on a first time period, the first time period being determined according to predefined information, or the first time period being determined according to preconfigured information, or the first time period being determined according to network configuration information, or the first time period being determined according to third indication information sent by the first terminal device.
The method of claim 40, wherein the end position of the first side line transmission is used to determine a second time, a time interval between the first time and the second time being greater than or equal to the first time, the second time being prior to the first time.
A method as defined in claim 41, wherein the first terminal device uses the third default spatial reception filter for sidestream transmissions during the time interval.
The method of claim 41 or 42, wherein,

The end position of the first side line transmission corresponds to the end position of the time slot where the first side line transmission is located; or alternatively

The end position of the first sidelink transmission corresponds to the end position of the last time domain symbol occupied by the first sidelink transmission; or alternatively

The end position of the first sidelink transmission corresponds to the end position of the last time domain symbol occupied by the third sidelink transmission of the first sidelink transmission schedule.
The method of any one of claims 41 to 43, wherein,

If the second indication information is carried in the first-order SCI, the end position of the first side transmission corresponds to the end position of the last time domain symbol of the PSCCH or corresponds to the end position of the last time domain symbol of the PSCCH scheduled PSCCH;

If the second indication information is carried in the second-level SCI, the end position of the first side transmission corresponds to the end position of the last time domain symbol of the second-level SCI or corresponds to the end position of the last time domain symbol of the PSCCH scheduled pscsch;

If the second indication information is carried in the MAC CE, the end position of the first side transmission corresponds to the end position of the last time domain symbol of the PSSCH carrying the MAC CE;

If the second indication information is carried in the PC5-RRC signaling, the end position of the first side transmission corresponds to the end position of the last time domain symbol of the PSSCH carrying the PC5-RRC signaling;

wherein the first order SCI is carried in the PSCCH.
The method according to any one of claims 39 to 44, wherein if the second indication information is carried in a first-order SCI, a second-order SCI or a MAC CE, the second terminal device receives a first side-line transmission carrying the second indication information sent by the first terminal device, and activates side-line feedback.
The method according to any one of claims 39 to 45, wherein the second terminal device receives the first side-line transmission carrying the second indication information sent by the first terminal device using a third default spatial domain receive filter, comprising:

And under the condition that the current wave beam fails, the second terminal equipment receives the first side transmission carrying the second indication information and sent by the first terminal equipment by using a third default airspace receiving filter.
The method of claim 46, wherein the method further comprises:

And the second terminal equipment uses a third default airspace transmission filter to transmit fourth indication information to the first terminal equipment, wherein the fourth indication information is used for indicating the current beam failure.
The method of claim 29, wherein the second terminal device receives the first side-line transmission sent by the first terminal device using a third default spatial reception filter, comprising:

And under the condition that the unicast link fails, the second terminal equipment uses a third default airspace receiving filter to receive a unicast link connection request message sent by the first terminal equipment, wherein the unicast link connection request message is used for requesting to establish the unicast link.
The method of any one of claims 29 to 48, wherein,

The third default spatial transmit filter and/or the third default spatial receive filter corresponds to a third default TCI state; or alternatively

The third default spatial transmit filter and/or the third default spatial receive filter corresponds to a third default sidelink CSI-RS resource.
The method of any of claims 29-49, wherein the third default spatial transmit filter and/or the third default spatial receive filter is determined based on at least one of predefined information, pre-configuration information, network configuration information.
The method of any one of claims 29 to 49, wherein the third default spatial transmit filter and/or the third default spatial receive filter is determined based on sixth indication information configured by the first terminal device or the second terminal device, the sixth indication information being used to indicate the third default spatial transmit filter and/or the third default spatial receive filter.
The method of claim 51, wherein the sixth indication information is carried in SCI, or MAC CE, or PC5-RRC signaling.
The method of claim 51 or 52, wherein the method further comprises:

Before the sixth indication information is configured, the second terminal equipment uses a fourth default airspace transmitting filter and/or a fourth default airspace receiving filter to perform sidestream transmission.
The method of claim 53, wherein the fourth default spatial transmit filter and/or the fourth default spatial receive filter is determined based on at least one of predefined information, pre-configuration information, network configuration information.
The method of claim 53 or 54, wherein the method further comprises:

If the unicast link between the second terminal device and the first terminal device is valid, then:

if the second terminal device configures the third default airspace sending filter and/or the third default airspace receiving filter to the second terminal device through the sixth indication information, the first terminal device uses the third default airspace sending filter and/or the third default airspace receiving filter to perform sidestream transmission;

And if the first terminal equipment does not configure the third default airspace sending filter and/or the third default airspace receiving filter to the second terminal equipment through the sixth indication information, the first terminal equipment uses the fourth default airspace sending filter and/or the fourth default airspace receiving filter to carry out sidestream transmission.
The method of claim 53 or 54, wherein the method further comprises:

And if the unicast link between the second terminal equipment and the first terminal equipment is invalid, the second terminal equipment uses the fourth default airspace transmitting filter and/or the fourth default airspace receiving filter to carry out sidestream transmission.
A sidestream transmission device applied to a first terminal device, the device comprising:

And the transmission unit is used for transmitting the first side line transmission to the second terminal equipment by using the first default airspace transmission filter and/or receiving the second side line transmission transmitted by the second terminal equipment by using the first default airspace reception filter.
A sidestream transmission device applied to a second terminal device, the device comprising:

And the transmission unit is used for receiving the first side line transmission sent by the first terminal equipment by using a third default airspace receiving filter and/or sending the second side line transmission to the first terminal equipment by using a third default airspace sending filter.
A terminal device, comprising: a processor and a memory for storing a computer program, the processor being for invoking and running the computer program stored in the memory, performing the method of any of claims 1 to 28, or the method of any of claims 29 to 56.
A chip, comprising: a processor for calling and running a computer program from memory, causing a device on which the chip is mounted to perform the method of any one of claims 1 to 28 or the method of any one of claims 29 to 56.
A computer readable storage medium storing a computer program for causing a computer to perform the method of any one of claims 1 to 28 or the method of any one of claims 29 to 56.
A computer program product comprising computer program instructions which cause a computer to perform the method of any one of claims 1 to 28 or the method of any one of claims 29 to 56.
A computer program which causes a computer to perform the method of any one of claims 1 to 28 or the method of any one of claims 29 to 56.