WO2020135151A1 - 用于侧行链路通信的方法、网络设备以及终端设备 - Google Patents

用于侧行链路通信的方法、网络设备以及终端设备 Download PDF

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Publication number
WO2020135151A1
WO2020135151A1 PCT/CN2019/125954 CN2019125954W WO2020135151A1 WO 2020135151 A1 WO2020135151 A1 WO 2020135151A1 CN 2019125954 W CN2019125954 W CN 2019125954W WO 2020135151 A1 WO2020135151 A1 WO 2020135151A1
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WIPO (PCT)
Prior art keywords
terminal device
information
terminal
slot format
indication information
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PCT/CN2019/125954
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English (en)
French (fr)
Inventor
张莉莉
张兴炜
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华为技术有限公司
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Publication of WO2020135151A1 publication Critical patent/WO2020135151A1/zh
Priority to US17/360,182 priority Critical patent/US20210329650A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/53—Allocation or scheduling criteria for wireless resources based on regulatory allocation policies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H04W4/08—User group management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037—Inter-user or inter-terminal allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0078—Timing of allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/1469—Two-way operation using the same type of signal, i.e. duplex using time-sharing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/121—Wireless traffic scheduling for groups of terminals or users
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • the present application relates to the field of communication technology, and more specifically, to a method, network device, and terminal device for side link communication.
  • V2X communication The communication methods in the vehicle-to-everything (V2X) system are collectively referred to as V2X communication (X represents anything).
  • the V2X communication includes: vehicle-to-vehicle (V2V) communication, vehicle-to-vehicle infrastructure (V2I) communication, vehicle-to-pedestrian communication (vehicle-to-vehicle) Pedestrian (V2P) or vehicle-to-network (V2N) communication, etc.
  • V2V vehicle-to-vehicle
  • V2I vehicle-to-vehicle infrastructure
  • V2P vehicle-to-pedestrian
  • V2N vehicle-to-network
  • the communication between the terminal devices involved in the V2X system is widely referred to as sidelink (slidelink, SL) communication.
  • SL sidelink
  • the network device When the terminal device communicates with the network device or other terminal devices, the network device will configure the time slot format for the terminal device in the time domain, where the time slot format can indicate the terminal device's different symbols on multiple symbols in a time slot 'S transfer status.
  • the transmission state may be an uplink transmission state, a downlink transmission state, or a flexible transmission state.
  • the network device configures the slot format (SF) of the time slot through semi-static or dynamic signaling.
  • dynamic configuration refers to the slot format indication (slot format format indicator, SFI) in the downlink control information (DCI) signaling. How to determine the time slot format of the terminal equipment in the terminal equipment group and realize the side link multicast communication between the terminal equipment in the terminal equipment group has become an urgent problem to be solved.
  • the present application provides a method, network equipment, and terminal equipment for side link communication.
  • the network equipment can configure a time slot format for the terminal equipment in the terminal equipment group to implement sidewalk between the terminal equipment in the terminal equipment group.
  • Link multicast communication can be configured.
  • a method for side link communication including: a network device determining downlink control information, where the downlink control information carries first indication information, where the first indication information is used to indicate N1
  • the configuration of the time slot format can be implemented for the terminal equipment group.
  • the information segment involved in the embodiments of the present application refers to part of the information included in the first indication information carried in the downlink control information, and may also be referred to as an information segment, an information field, an information location, an information unit, or a field Wait.
  • the N1 is equal to 1; the first indication information is used to indicate a slot format corresponding to N1 terminal device groups, including: the first indication information It is used to indicate the time slot format corresponding to the N terminal devices in the first terminal device group.
  • the first indication information includes N information segments, and one of the N information segments is used to indicate the first Time slot format corresponding to one terminal device in the terminal device group.
  • the first indication information carried in the downlink control information may be used to indicate a slot format corresponding to N terminal devices in a terminal device group, and is implemented as a terminal
  • the terminal equipment in the equipment group is configured with a time slot format.
  • N terminal devices in the above terminal device group may be a part of terminal devices in the terminal device group, or may be all terminal devices in the terminal device group.
  • the terminal device group is composed of N2 terminal devices that perform side link multicast communication, where N2 is an integer greater than 2 and greater than or equal to N.
  • the N1 is greater than 1; the first indication information is used to indicate a slot format corresponding to the N1 terminal device group, and the first indication information It includes N1 information segments, and one information segment in the N1 information segments is used to indicate a slot format corresponding to one terminal device group among the N1 terminal device groups.
  • the first indication information carried in the downlink control information may be used to indicate a slot format corresponding to multiple terminal device groups, and when configured for multiple terminal device groups Gap format.
  • the correspondence between the N pieces of information and the N terminal devices is pre-configured, or the method further includes: the network device The N terminal devices send a second message, and the second message includes a correspondence between the N information segments and the N terminal devices.
  • the network device may establish a correspondence between N pieces of information and the N terminal devices, and compare the N pieces of information with the N terminal devices.
  • the correspondence is notified to N terminal devices through a second message; or, the correspondence between the N pieces of information and the N terminal devices is pre-configured in the network device and/or N terminal devices so that the N terminal devices can learn A correspondence relationship between the N information segments and the N terminal devices, and a corresponding information segment is acquired based on the correspondence relationship.
  • the correspondence between the N information segments and the N terminal devices is a one-to-one correspondence between the N information segments and the N terminal devices, and one information segment is used to indicate that the one-to-one correspondence is satisfied
  • the time slot format of a terminal device in relation is a one-to-one correspondence between the N information segments and the N terminal devices, and one information segment is used to indicate that the one-to-one correspondence is satisfied.
  • the one-to-one correspondence between the N information segments and the N terminal devices in the embodiment of the present application may be a one-to-one correspondence between the N information segments and the identifiers of the N terminal devices , Where the identifier of the terminal device is the relative or absolute identifier of the terminal device in the terminal device group to which it belongs.
  • the absolute identification may be a wireless network temporary identification (radio network temporary identity, RNTI).
  • the downlink control information further includes second indication information, where the second indication information is used to identify the N terminal devices.
  • the terminal device receiving the downlink control information may be notified by carrying the second indication information in the downlink control information, and the information segment in the first indication information can determine which The time slot format of the terminal equipment.
  • the second indication information includes an identification of a starting terminal device among the N terminal devices; or, the second indication information includes the N The identification of each terminal device in the terminal device.
  • the second indication information may be an identifier indicating only the starting terminal device among N terminal devices, and the N terminals can be determined according to the identifier of the starting terminal device Device; or, the second indication information may include an identification of each of the N terminal devices.
  • the correspondence between the N1 information segments and the N1 terminal device groups is pre-configured, or the method further includes: the network device Sending a third message to the terminal devices in the N1 terminal device group, where the third message includes the correspondence between the N1 information segments and the N1 terminal device group.
  • the network device may establish a correspondence between N1 information segments and the N1 terminal device group, and compare the N1 information segments with the N1 terminal devices The corresponding relationship of the group is notified to the terminal devices in the N1 terminal device group through a second message; or, the corresponding relationship between the N1 information segment and the N1 terminal device group is pre-configured in the network device and/or N1 terminal device group
  • the terminal devices in the N1 terminal device group can learn the corresponding relationship between the N1 information segments and the N1 terminal device group, and obtain the information segment corresponding to the terminal device group based on the corresponding relationship.
  • N1 information segments and the N1 terminal device groups is a one-to-one correspondence between N1 information segments and the N1 terminal device groups, and one information segment is used to indicate that the A time slot format of a terminal equipment group in a correspondence relationship.
  • the one-to-one correspondence between the N1 information segments and the N1 terminal device groups in the embodiment of the present application may be a one-to-one relationship between the N1 information segments and the identifiers of the N1 terminal device groups Correspondence, wherein the identifier of the terminal device group is information that can uniquely determine the terminal device group in the side link communication system within the coverage of the network device.
  • the downlink control information further includes fourth indication information, where the fourth indication information is used to identify the N1 terminal device groups.
  • the terminal device receiving the downlink control information may be notified by carrying the fourth indication information in the downlink control information, and the information segment in the first indication information can determine which Time slot format of the terminal equipment group.
  • the fourth indication information includes an identifier of a starting terminal device group among the N1 terminal device groups; or, the fourth indication information includes the The identification of each terminal device group in N1 terminal device groups.
  • the time slot format corresponding to the one terminal device group is the time slot format corresponding to the terminal device serving as the sender in the one terminal device group.
  • the network device when the network device indicates the time slot format corresponding to a terminal device group through an information segment in the first indication information, the information segment indicates the terminal device group
  • the time slot format corresponding to the terminal device in which the information is sent is that, because the communication between the terminal devices in the terminal device group is multicast communication, one terminal device performs the transmission, and the other terminal devices in the terminal device group perform the reception.
  • the method before the network device sends the downlink control information, the method further includes: the network device scrambling the downlink control information using a first identifier , Where the first identifier is pre-configured or notified through semi-static signaling.
  • the network device scrambles the sent downlink control information based on the first identifier, and in order that the terminal device receiving the downlink control information can parse the downlink control information,
  • the first identifier may be notified to terminal devices in N1 terminal device groups through semi-static signaling or the first identifier is pre-configured.
  • the method further includes: the network device sends third indication information to terminal devices in the N1 terminal device group, the third indication information It is used to indicate a first search space, where the first search space is a search space for detecting the downlink control information.
  • the network device determines the first search space and notifies the terminal device of the first search space through the third indication information.
  • a method for side link communication including: a terminal device receiving downlink control information sent by a network device, where the downlink control information carries first indication information, wherein the first The indication information is used to indicate a time slot format corresponding to N1 terminal device groups.
  • One terminal device group includes a plurality of terminal devices performing sidelink multicast communication, and N1 is a positive integer; the terminal device analyzes the downlink control information .
  • the method for side link communication by making the first indication information carried in the downlink control information received by the terminal device, where the first indication information indicates the slot format corresponding to the terminal device group, Realize the configuration of time slot format for the terminal equipment group.
  • the N1 is equal to 1; the first indication information is used to indicate a slot format corresponding to N1 terminal device groups, including: the first indication information It is used to indicate the time slot format corresponding to the N terminal devices in the first terminal device group.
  • the first indication information includes N information segments, and one of the N information segments is used to indicate the first Time slot format corresponding to one terminal device in the terminal device group.
  • the first indication information carried in the downlink control information may be used to indicate a slot format corresponding to N terminal devices in a terminal device group, and is implemented as a terminal
  • the terminal equipment in the equipment group is configured with a time slot format.
  • the N1 is greater than 1; the first indication information is used to indicate a slot format corresponding to the N1 terminal device group, and the first indication information It includes N1 information segments, and one information segment in the N1 information segments is used to indicate a slot format corresponding to one terminal device group among the N1 terminal device groups.
  • the first indication information carried in the downlink control information may be used to indicate a slot format corresponding to multiple terminal device groups, and when configured for multiple terminal device groups Gap format.
  • the correspondence between the N pieces of information and the N terminal devices is pre-configured, or the method further includes: the terminal device receiving A second message sent by the network device, where the second message includes a correspondence between the N pieces of information and the N terminal devices.
  • the terminal device receives a second message sent by the network device that carries the correspondence between the N pieces of information and the N terminal devices; or, the N pieces of information
  • the correspondence relationship between the segment and the N terminal devices is pre-configured in the network device and/or N terminal devices, so that the N terminal devices can learn the corresponding relationship between the N information segments and the N terminal devices, and obtain based on the corresponding relationship Corresponding piece of information.
  • the downlink control information further includes second indication information, where the second indication information is used to identify the N terminal devices.
  • the terminal device receiving the downlink control information may be notified by carrying the second indication information in the downlink control information, and the information segment in the first indication information can determine which The time slot format of the terminal equipment.
  • the second indication information includes the identification of the originating terminal device among the N terminal devices; or, the second indication information includes the N The identification of each terminal device in the terminal device.
  • the second indication information may be an identifier indicating only the starting terminal device among N terminal devices, and the N terminals can be determined according to the identifier of the starting terminal device Device; or, the second indication information may include an identification of each of the N terminal devices.
  • the correspondence between the N1 information segments and the N1 terminal device groups is pre-configured, or the method further includes: the terminal device Receiving a third message sent by the network device, where the third message includes the correspondence between the N1 information segments and the N1 terminal device group.
  • the terminal device receives a third message sent by the network device that carries the correspondence between the N1 information segment and the N1 terminal device group; or, the N1
  • the correspondence between the information segment and the N1 terminal device group is pre-configured in the network device and/or the terminal device in the N1 terminal device group, so that the terminal devices in the N1 terminal device group can learn the N1 information segment and N1 Correspondence of each terminal device group, based on the correspondence relationship to obtain the corresponding piece of information corresponding to the terminal device group.
  • the time slot format corresponding to the one terminal device group is the time slot format corresponding to the terminal device in the terminal device group that is the sender; the terminal device Start the automatically detected transmission mode to detect the resources that can be transmitted on the slot format corresponding to the terminal equipment group, and determine its own time slot format according to the detection result; or, the terminal equipment according to the time slot corresponding to the terminal equipment group Format, allocate resources to the terminal devices in the terminal device group, and determine their own time slot format.
  • the network device when the network device indicates the time slot format corresponding to a terminal device group through an information segment in the first indication information, the information segment indicates the terminal device group
  • the time slot format corresponding to the terminal device in which the information is sent is that, because the communication between the terminal devices in the terminal device group is multicast communication, one terminal device performs the transmission, and the other terminal devices in the terminal device group perform the reception.
  • the terminal device in the terminal device group starts the automatic detection transmission mode to detect the resources that can be transmitted on the time slot format corresponding to the terminal device group, and determines the respective time slot format according to the detection result; or, the terminal device The group includes a master terminal device, and the master terminal device allocates resources to the terminal devices in the terminal device group according to the time slot format corresponding to the terminal device group, thereby determining the time slot format of the terminal device in the terminal device group.
  • the method before the terminal device receives the downlink control information sent by the network device, the method further includes: the terminal device acquiring the first identifier, The first identifier is used to scramble the downlink control information; the acquiring of the first identifier by the terminal device includes: the first identifier is pre-configured, or the terminal device receives the message sent by the network device Semi-static signaling, where the first identifier is carried in the semi-static signaling.
  • the terminal device obtains the first identifier of the scrambled downlink control information by receiving semi-static signaling delivered by the network device, or the first identifier of the scrambled downlink control information.
  • An identifier is pre-configured.
  • the method further includes: the terminal device receives third indication information sent by the network device, and the third indication information is used to indicate the first search Space, wherein the first search space is a search space for detecting the downlink control information.
  • the terminal device determines the first search space for detecting the downlink control information by receiving the third indication information.
  • a network device which can be used to perform the operations of the network device in the first aspect and any possible implementation manner of the first aspect.
  • the network device includes means corresponding to the steps or functions described in the first aspect above, and may be the network device of the first aspect.
  • the steps or functions may be implemented by software, hardware, or a combination of hardware and software.
  • a terminal device which can be used to perform the operation of the terminal device in the second aspect and any possible implementation manner of the second aspect.
  • the terminal device may include means corresponding to performing the steps or functions described in the second aspect above.
  • the steps or functions may be implemented by software, hardware, or a combination of hardware and software.
  • a side link communication device including a processor and a memory, where the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory so that the side link
  • the communication device performs the method for sidelink communication in any possible implementation manner of the first or second aspect.
  • processors there are one or more processors, and one or more memories.
  • the memory may be integrated with the processor, or the memory and the processor are provided separately.
  • the side link communication device further includes a transmitter (transmitter) and a receiver (receiver).
  • a system includes the network device and the terminal device described above.
  • a computer program product includes: a computer program (also referred to as code or instructions) that, when the computer program is executed, causes the computer to perform the first aspect or the above Any one of the two possible implementation methods.
  • a chip system including a memory and a processor, the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that a side link on which the chip system is installed
  • the communication device performs the method in any possible implementation manner of the first aspect to the second aspect above.
  • the method, network device, and terminal device for side link communication indicate the time slot format corresponding to at least one terminal device group by causing the first indication information carried in the downlink control information delivered by the network device, Furthermore, the time slot format can be configured for the terminal devices in the terminal device group, so as to realize the side link multicast communication between the terminal devices in the terminal device group.
  • FIG. 1 is a schematic diagram of a V2X system in the prior art.
  • FIG. 2 is a schematic block diagram of a communication system applicable to an embodiment of the present application.
  • FIG. 3 are schematic diagrams of terminal device groups provided by embodiments of the present application.
  • FIG. 4 is a schematic diagram of a time slot format for side link communication.
  • FIG. 5 is a schematic diagram of another time slot format for side link communication.
  • FIG. 6 is a schematic diagram of a method for side link communication provided by an embodiment of the present application.
  • FIG. 7(a)-(e) are schematic diagrams showing that the information segment corresponding to the terminal device group provided by the embodiment of the present application.
  • FIG. 8 is a schematic diagram of a one-to-one correspondence between an information segment and a terminal device provided by an embodiment of the present application.
  • FIG. 9 is a schematic diagram of another one-to-one correspondence between information segments and terminal devices provided by an embodiment of the present application.
  • FIG. 10 is a schematic diagram of a one-to-one correspondence between an information segment and a terminal device group provided by an embodiment of the present application.
  • FIG. 11 is a schematic diagram of another one-to-one correspondence between an information segment and a terminal device group provided by an embodiment of the present application.
  • FIG. 12 is a schematic diagram of a format of second indication information provided by the present application.
  • 13 is a schematic diagram of an indication time slot format provided by this application.
  • FIG. 14 is a schematic diagram of another indication slot format provided by this application.
  • 15 is a schematic diagram of an apparatus 10 for side link communication proposed in this application.
  • FIG. 16 is a schematic structural diagram of a terminal device 20 suitable for an embodiment of the present application.
  • FIG. 17 is a schematic diagram of an apparatus 30 for side link communication proposed in this application.
  • FIG. 18 is a schematic structural diagram of a network device 40 applicable to an embodiment of the present application.
  • GSM global mobile communication
  • CDMA code division multiple access
  • WCDMA broadband code division multiple access
  • general packet radio service general packet radio service, GPRS
  • LTE long term evolution
  • LTE frequency division duplex FDD
  • TDD time division duplex
  • UMTS universal mobile communication system
  • WiMAX worldwide interoperability for microwave access
  • the terminal device in the embodiments of the present application may refer to user equipment, access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or User device.
  • Terminal devices can also be cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (personal digital assistants, PDAs), and wireless communication Functional handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in future 5G networks or public land mobile communication networks (PLMN) in the future evolution
  • SIP session initiation protocol
  • WLL wireless local loop
  • PDAs personal digital assistants
  • the terminal device and the like are not limited in this embodiment of the present application.
  • the network device in the embodiment of the present application may be a device for communicating with a terminal device, and the network device may be a global system for mobile (GSM) system or code division multiple access (CDMA)
  • the base station (base transceiver) (BTS) in the system can also be the base station (NodeB, NB) in the wideband code division multiple access (WCDMA) system, or the evolved base station (evolved) in the LTE system NodeB, eNB or eNodeB), or a wireless controller in a cloud radio access network (CRAN) scenario
  • the network device may be a relay station, an access point, an in-vehicle device, a wearable device, and future Network devices in a 5G network or network devices in a PLMN network that will evolve in the future are not limited in the embodiments of the present application.
  • the terminal device or the network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer.
  • the hardware layer includes hardware such as a central processing unit (CPU), memory management unit (MMU), and memory (also called main memory).
  • the operating system may be any one or more computer operating systems that implement business processes through processes, for example, a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a windows operating system.
  • the application layer includes applications such as browsers, address books, word processing software, and instant messaging software.
  • the embodiments of the present application do not specifically limit the specific structure of the execution body of the method provided in the embodiments of the present application, as long as it can run the program that records the code of the method provided by the embodiments of the present application to provide according to the embodiments of the present application
  • the method may be used for communication.
  • the execution body of the method provided in the embodiments of the present application may be a terminal device or a network device, or a functional module in the terminal device or network device that can call a program and execute the program.
  • the term "article of manufacture” as used in this application encompasses a computer program accessible from any computer-readable device, carrier, or medium.
  • the computer-readable medium may include, but is not limited to: magnetic storage devices (for example, hard disks, floppy disks, or magnetic tapes, etc.), optical disks (for example, compact discs (CDs), digital universal discs (digital discs, digital discs, DVDs)) Etc.), smart cards and flash memory devices (for example, erasable programmable read-only memory (EPROM), cards, sticks or key drives, etc.).
  • various storage media described herein may represent one or more devices and/or other machine-readable media for storing information.
  • machine-readable medium may include, but is not limited to, wireless channels and various other media capable of storing, containing, and/or carrying instructions and/or data.
  • ITS intelligent transportation system
  • vehicles can obtain traffic information or receive service information in a timely manner through V2V, V2I, V2P or V2N communication methods. These communication methods can be collectively referred to as V2X communication.
  • FIG. 1 is a schematic diagram of a V2X system in the prior art. The diagram includes V2V communication, V2P communication, and V2I/N communication.
  • vehicles communicate via V2V.
  • the vehicle can broadcast its own speed, driving direction, specific location, whether it has stepped on the emergency brake, etc. to the surrounding vehicles.
  • the driver of the surrounding vehicle can better perceive the traffic situation beyond the line of sight, thus Dangerous conditions are pre-judgment and avoidance is made;
  • vehicles and roadside infrastructure communicate through V2I, and roadside infrastructure can provide vehicles with various service information and data network access.
  • functions such as non-parking tolls and in-car entertainment have greatly improved traffic intelligence.
  • Roadside infrastructure for example, roadside units (RSU) includes two types: one is the terminal equipment type RSU.
  • the RSU of the terminal device type can provide timing synchronization and resource scheduling for vehicles communicating with the network device.
  • Vehicles and people for example, vehicles and pedestrians, vehicles and cyclists, vehicles and drivers or vehicles and passengers
  • V2P Vehicles and people
  • V2N Vehicles and networks communicate through V2N
  • V2N can be collectively referred to as V2I/N with the aforementioned V2I.
  • FIG. 1 is only an exemplary schematic diagram for introducing the V2X system, and does not constitute any limitation to the present application.
  • the number of vehicles, the number of pedestrians, and the number of infrastructures may be multiple, not the number shown in FIG. 1.
  • FIG. 1 briefly introduces the V2X system involved in the prior art. The following briefly describes the applicable scenarios of the implementation provided by the present application in conjunction with FIG. 2.
  • FIG. 2 is a schematic block diagram of a communication system applicable to an embodiment of the present application.
  • the terminal device 121 and the network device 110 may determine the resources used for transmitting data with the terminal device 122 through signaling interaction, and then, the terminal device 121 Use the determined resources to communicate with the terminal device 122; or, before transmitting data, the terminal device 122 and the network device 110 may determine the resources used to transmit data with the terminal device 121 through signaling interaction, and then the terminal device 122 uses the determined Resources communicate with the terminal device 121. That is, the embodiments of the present application are applied to application scenarios of side link data transmission.
  • FIG. 2 is only a schematic diagram and does not constitute any limitation to the protection scope of the present application.
  • the number of terminal devices shown in FIG. 2 is just an example.
  • side link communication the communication between the terminal devices involved in the V2X system described above is referred to as side link communication, which does not constitute any limitation on this application.
  • side link communication may also be referred to as side link communication, through link communication, or secondary link communication.
  • side link communication it is not necessarily limited to V2X systems.
  • communication between terminal devices It can also be called sidelink communication.
  • FIG. 2 introduces the applicable scenarios of the embodiments of the present application.
  • the following briefly introduces several basic concepts involved in the technical solutions of the present application.
  • 5G NR mobile communication needs to have higher performance than the 4th generation (4th generation, 4G) mobile communication.
  • the 15th version of the 5G new radio access technology (5th generation new radio access technology, 5G NR) RAT defines a new air interface access technology.
  • the air interface access technology supports a user experience rate of 0.1 to 1 gigabit per second (gigabit per second, Gbps), a connection density of one million per square kilometer, end-to-end latency in milliseconds, and per square kilometer
  • user experience rate, connection number density and delay are the three most basic performance indicators of 5G.
  • 5G also needs to greatly improve the efficiency of network equipment deployment and operation. Compared with 4G, spectrum efficiency is improved by 5 to 15 times, and energy efficiency and cost efficiency are improved by more than 100 times.
  • 5G NR The three major application scenarios of 5G NR include enhanced mobile broadband (eMBB), massive machine-type-communications (mMTC), and ultra-reliable and low-latency communications (ultra, reliable, and low-latency communications, URLLC ).
  • eMBB enhanced mobile broadband
  • mMTC massive machine-type-communications
  • URLLC ultra-reliable and low-latency communications
  • URLLC application scenarios include unmanned driving, industrial control, etc.
  • the URLLC application scenario requires low latency and high reliability.
  • the specific requirements for low latency are end-to-end 0.5ms delay, and the air interface information exchanges back and forth for 1ms.
  • the specific requirement for high reliability is that the block error rate (BLER) reaches 10 ⁇ (-5), that is, the data packet The correct receiving ratio reaches 99.999%.
  • BLER block error rate
  • the baseline is 15kHz, which can be 15kHz*2 ⁇ n , n is an integer, from 3.75kHz, 7.5kHz to 480kHz, up to 8 kinds.
  • n is an integer, from 3.75kHz, 7.5kHz to 480kHz, up to 8 kinds.
  • symbol lengths and slot lengths as shown in Table 1 below.
  • S refers to a symbol. It can be seen from the table that the corresponding symbol length when the subcarrier spacing is f0 is twice the corresponding symbol length when the carrier spacing is f1, and four times the corresponding symbol length when the carrier spacing is f2.
  • Table 1 is only an exemplary table used to illustrate that there are many different symbol lengths corresponding to different subcarrier intervals. This application does not constitute any limitation.
  • the time slot may also have different time slot types, and different time slot types include different numbers of symbols.
  • the number of symbols contained in a mini slot is less than 7, for example, the number of symbols contained in a mini slot is 1 symbol, 2 symbols, 4 symbols, etc.; the symbols contained in a normal slot (Slot) The number is 7 symbols or 14 symbols.
  • time slot including 14 symbols as an example to describe the method for side link communication provided by the present application.
  • specific form of the time slot is not limited in the embodiments of the present application.
  • a time slot can contain at least one of downlink transmission symbols, flexible symbols, and uplink transmission symbols, and different time slots are configured to achieve different functions.
  • the composition of different time slots is called different slot format (slot format, SF).
  • the downlink transmission symbol is used for downlink transmission
  • the uplink transmission symbol is used for uplink transmission
  • the flexible symbol is used for direction configurable (can be configured by the terminal device specific radio resource control (RRC) to change the transmission direction, or can be Downlink control information (downlink control information, DCI) changes the transmission direction), or gap, or guard interval (GP).
  • RRC terminal device specific radio resource control
  • DCI Downlink control information
  • GP guard interval
  • the transmission state of each symbol contained in the time slot is any one of the following:
  • Uplink transmission (uplink, UL) state, downlink transmission (downlink, DL) state and unknown state (unknown) state can be recorded as UL/DL/X (or U/D/X for short).
  • X is called unknown state or flexible state, and the terminal device neither receives nor sends information on the symbol corresponding to the X state.
  • X can also be called F or U.
  • time slot format _0 refers to the transmission status of 14 symbols contained in a time slot are all downlink transmission states; time slot format _1 refers to the transmission state of 14 symbols contained in a time slot are all uplink transmission Status; time slot format_2 refers to the transmission status of 14 symbols contained in a time slot are neither uplink nor uplink transmission status.
  • time slot format_0 refers to the transmission status of 14 symbols contained in a time slot are all downlink transmission states;
  • time slot format _1 refers to the transmission state of 14 symbols contained in a time slot are all uplink transmission Status; time slot format_2 refers to the transmission status of 14 symbols contained in a time slot are neither uplink nor uplink transmission status.
  • different timeslot formats include different numbers of uplink transmission symbols, downlink transmission symbols, or flexible symbols.
  • 5G NR supports semi-static or dynamic time slot format configuration.
  • the network device sends semi-static signaling to the terminal device, and the semi-static signaling is used for time slot format configuration. For example, the transmission status of the symbols included in each time slot of the terminal device over a period of time or a certain period of time is notified through RRC signaling.
  • the semi-static signaling can be cell-specific, that is, all terminal devices in the cell receive this semi-static signaling to implement slot format configuration; or, the semi-static signaling can also be The dedicated signaling of a certain terminal device(s), that is to say, the certain terminal device(s) receives the semi-static signaling to realize the configuration of the time slot format.
  • 5G NR also supports time slot format to notify the terminal equipment through DCI signaling over a period of time or a period or periods on a period of time.
  • the DCI signaling includes slot format indicator (SFI) information, so it is called dynamic SFI signaling.
  • SFI slot format indicator
  • the SFI information is delivered through DCI2_0 information.
  • the DCI2_0 information can cover the above-mentioned semi-statically configured time slot format, where the symbol transmission state is unknown.
  • the DCI2_0 is a downlink control information format specified in the protocol for carrying SFI information.
  • 5G NR also predefines multiple symbol state combinations of multiple time slots, and the table where the combination is located is called a terminal specific table (specific table).
  • the network device configures a slot format combination (slot format combination) on one or more time slots through RRC signaling, where the combined sequence identification (entry identification, entry ID) may be used to indicate a specific slot format.
  • DCI signaling can dynamically indicate the slot format combination on the one or more time slots.
  • the maximum number of entries (max, Nrof, Slot, Format, Combinations, Set) in this specific table is 512, and the maximum number of slots (max, Nrof, Slot, Formats, Per, Combination) for each entry is 256.
  • Table 2 is the terminal specific table specific table.
  • s refers to a symbol (symbol)
  • n and m are identifications of different symbols.
  • the network device sends an entry ID configuration information and a specific time slot format table corresponding to the entry ID through RRC signaling.
  • the horizontal axis is the different slots in the combination, and the vertical axis is the entry ID.
  • Table 2 contains the possible time slot format combinations for each entry.
  • DCI signaling is used to indicate that the corresponding configuration of the corresponding carrier is an entry ID in the table.
  • DCI signaling is carried on the group common physical-physical downlink control channel (GC-PDCCH) channel.
  • GC-PDCCH group common physical-physical downlink control channel
  • Each SFI information carried in the DCI signaling is an entry ID corresponding to a slot format combination, and a total of 16 SFI information can be carried in the DCI signaling.
  • the SFI information can be understood as the index of SFI.
  • the network device configures the terminal device to periodically detect the GC-PDCCH and receive DCI signaling carrying SFI. This period is called a monitoring period.
  • multiple terminal devices that perform side link communication can perform groupcast communication in the form of a group.
  • the group formed by the multiple terminal devices can be referred to as a terminal device group.
  • Multicast communication is usually a terminal device in the terminal device group performs the action of sending information, and other terminal devices in the terminal device group receive the information sent by the terminal device. It should be understood that during multicast communication, there are usually multiple terminal devices in the terminal device group. For example, there are more than 2 terminal devices in each terminal device group.
  • FIG. 3 is a schematic diagram of a terminal device group provided by an embodiment of the present application.
  • the schematic diagram includes multiple terminal devices.
  • terminal device #A is a terminal device in the terminal device group that performs sending information
  • terminal device #B to terminal device #E are terminal devices in the terminal device group that perform receiving information.
  • the side link communication system within the coverage of the network device may include multiple terminal device groups related to each other.
  • terminal device group #1 and terminal device group #2 are Two related terminal equipment groups.
  • terminal equipment group #1 includes terminal equipment #A ⁇ terminal equipment #E
  • terminal equipment #A is the terminal equipment in terminal equipment group #1 that performs information transmission
  • terminal equipment #B is the terminal equipment group #1 is the terminal device that executes the reception of information
  • terminal device group #2 includes terminal device #1 ⁇ terminal device #5, terminal device #1 is the terminal device that performs information transmission in terminal device group #2, terminal device #2 ⁇
  • the terminal device #5 is a terminal device in the terminal device group #2 that performs reception of information.
  • related to multiple terminal device groups means that multiple terminal device groups need to coordinate resources with each other.
  • the network device needs to coordinate time-domain resources and/or frequency-domain resources and/or code-domain resources for multiple related terminal device groups.
  • FIG. 3(b) is just an example, and cannot limit the application.
  • the number of related terminal device group groups included in the side link communication system within the coverage of the network device may be more than the number of terminal device group groups shown in FIG. 3(b).
  • terminal device group #1-terminal device group #3 For the three terminal device groups and terminal device group #4-terminal device group #6 in the side link communication system within the coverage of the network device are the other side link communication systems within the coverage of the network device Related three terminal equipment groups. Specifically, terminal equipment group #1-terminal equipment group #3 is divided into area #1, and terminal equipment group #4-terminal equipment group #6 is divided into area #2.
  • the terminal device groups in the same area in the side link communication system within the coverage of the network device need to coordinate resources with each other.
  • the interference between different areas is small, which can be understood as a certain degree of isolation between different areas.
  • the network device may determine whether the terminal devices are based on the signal strength of the reference signal received power (RSRP)/reference signal received quality (RSRQ) reported by the terminal device, etc. There is interference, and resource allocation is coordinated between terminal equipment groups with strong interference.
  • RSRP reference signal received power
  • RSRQ reference signal received quality
  • FIG. 3(c) is only an example, and cannot limit the application.
  • the number of areas in the side link communication system covered by the network device may be more than the number of areas shown in FIG. 3(c).
  • a method for configuring the time slot format for side link communication is provided.
  • the method for configuring the time slot format is based on the above 5G NR system indication SFI, and further determines that the time slot can be used.
  • Symbol for side link communication The following briefly introduces the slot format indication method for side link communication with reference to FIGS. 4 and 5.
  • FIG. 4 is a schematic diagram of a time slot format for side link communication. The diagram includes the slot format shown in the first row and the slot format shown in the second row.
  • the first line in FIG. 4 shows the time slot format of the SFI configuration commonly used in 5G NR described above, where D indicates the transmission state of the symbol is the downlink transmission state, and U indicates the The transmission state of the symbol is the uplink transmission state and X indicates that the state of the symbol is an uncertain state.
  • the X symbol can also be called a flexible (F) symbol or an unknown (U) symbol, which means that the X symbol
  • the transmission direction is variable, or the transmission direction is configurable.
  • the second line in FIG. 4 shows the configuration of the slot format of SFI, which is common in 5G NR, and the symbol with the transmission status of the symbol in the time slot is X or U, further identifying the transmission status of the symbol as side Sidelink (S) symbol.
  • the side link communication time slot format indication (sidelink SFI, SL-SFI) may further indicate S_initial and S_end, where , S_initial refers to the start position of the S symbol, and S_end refers to the end position of the S symbol, so that the X or U symbol between S_initial and S_end is overwritten as the S symbol, which is used for sidelink communication.
  • SFI in 5G NR can indicate the D/X/U transmission status of multiple symbols contained in a time slot
  • SL-SFI in FIG. 4 can indicate the symbol S contained in the time slot.
  • the above-mentioned symbol S can also be regarded as an X symbol used for conversion between transmission and reception.
  • S can also be identified as the SL transmit (transmit, Tx) or SL receive (Rx) status on the sidelink.
  • FIG. 5 is a schematic diagram of another time slot format for side link communication. The diagram includes the slot format shown in the first row and the transmit and receive slot format shown in the second row.
  • the slot format shown in the first row in FIG. 5 is the slot format in the second row shown in FIG. 4, that is, the middle 12 symbols are used for SL.
  • multiple terminal devices when groupcast communication is performed on the side link, multiple terminal devices may establish a terminal device group, and the side link communication system within the coverage of the network device may include multiple Terminal device groups.
  • the V2X system includes terminal equipment #A-terminal equipment #E, where terminal equipment #A-terminal equipment #E constitute terminal equipment group #1, and terminal equipment #A is a terminal
  • the terminal device that sends information in device group #1, terminal device #B-terminal device #E is the terminal device that receives information in terminal device group #1; terminal device #1-terminal device #5 make up terminal device group #2 , Terminal device #1 is a terminal device that sends information in terminal device group #2, and terminal device #2-terminal device #5 is a terminal device that receives information in terminal device group #2.
  • multiple terminal devices in a terminal device group can be divided into an initiator terminal device (initiating user equipment, IUE) and a responder terminal device (reception user terminal equipment) according to different terminal devices that perform sending and receiving information.
  • IUE initiator terminal device
  • responder terminal device reception user terminal equipment
  • the initiator terminal device may also be called a sender terminal device or an active terminal device, and the responder terminal device may also be called a receiver terminal device or a passive terminal device.
  • terminal device group involved in this application is not limited to the terminal device group in the V2X system, and the terminal devices in other side link communication scenarios also include the above-mentioned terminal device group. I won't repeat them here.
  • the network device can indicate the time slot format of each terminal device in the terminal device group, so that each terminal device in the terminal device group knows respectively in which time domain position to transmit, And in which time domain positions are received, and the method for side link communication according to the embodiment of the present application occupies less information resources when indicating the slot format.
  • the method for side link communication can be applied to the above-mentioned V2V system or other scenarios of side link communication.
  • FIG. 6 is a schematic diagram of a method for side link communication provided by an embodiment of the present application. The method is described in detail below.
  • the network device determines downlink control information, where the downlink control information carries first indication information, where the first indication information is used to indicate a slot format corresponding to at least one terminal device group.
  • the network device determines which terminal device groups in the system need to be configured with a time slot format according to the total number of terminal device groups in the side link communication system within the coverage of the network device.
  • the total number of terminal device groups in the side link communication system within the coverage of the network device is M groups, and the network device determines that the terminal in the N1 terminal device group out of the M terminal device groups needs to be passed through the downlink control information Device configuration time slot format.
  • N1 is a positive integer
  • M is an integer greater than or equal to N1.
  • the network device configures N1 terminal device groups in the time slot format and the terminal devices in the N1 terminal device groups according to needs, and determines the load of downlink control information to be sent.
  • the downlink control information carries first indication information, and the first indication information is used to indicate a slot format corresponding to N1 terminal device groups.
  • the information segment of a terminal device group includes a plurality of terminal devices that perform side link multicast communication.
  • a plurality of terminal devices in a terminal device group that perform sidelink multicast communication include an initiator terminal device for sending information; and also include multiple responders other than the initiator terminal device The terminal device is used to receive information sent by the initiator terminal device.
  • the first indication information is used to indicate the slot format corresponding to the N1 terminal device groups, including:
  • the first indication information is used to indicate the time slot format corresponding to the N terminal devices in the first terminal device group.
  • the first indication information includes N information segments, and one of the N information segments is used to indicate the first terminal device Time slot format corresponding to a terminal device in the group, where N is a positive integer. That is, the network device configures the time slot format for the terminal devices in the first terminal device group through the downlink control information, and the N pieces of information correspond one-to-one to the N terminal devices in the first terminal device group, and the N pieces of information are respectively Used to determine the slot format of N terminal devices. Where N is a positive integer less than or equal to the number of all terminal devices in the first terminal device group, that is, the network device can configure a time slot format for some or all terminal devices in the first terminal device group through downlink control information .
  • the first terminal device group may be any terminal device group in the side link communication system within the coverage of the network device, and the "first" is only used for distinguishing description, and should not constitute any limitation to this application.
  • the first indication information is used to indicate a time slot format corresponding to N1 terminal device groups
  • the first indication information includes N1 information segments
  • one of the N1 information segments is used to indicate Time slot format corresponding to one terminal equipment group among N1 terminal equipment groups. That is, the network device configures a slot format for N1 terminal device groups through downlink control information.
  • the N1 information segments correspond to the N1 terminal equipment groups one-to-one, and the N1 information segments are respectively used to determine the time slot format of the N1 terminal equipment groups.
  • N1 terminal device groups need to coordinate resources with each other, that is, N1 terminal device groups are terminal device groups in the same area.
  • N1 terminal equipment groups need to perform resource coordination with each other, including: N1 terminal equipment groups need to perform time-domain resource coordination with each other, and/or, N1 terminal equipment groups need to perform frequency domain with each other Resource coordination, and/or, N1 terminal equipment groups need to coordinate code domain resources with each other.
  • FIG. 7 is a schematic diagram illustrating that the information segments correspond to terminal device groups according to an embodiment of the present application:
  • N1 is equal to 1, and the network device configures the slot format for the terminal devices in the first terminal device group through the first indication information.
  • the first terminal device group is composed of N terminal devices that perform side link multicast communication.
  • the first indication information includes N pieces of information, and the N pieces of information correspond one-to-one to the N terminal devices in the first terminal device group.
  • the first indication information carried in the downlink control information includes N information segments (information segment #1 to information segment #N shown in FIG. 7(a)), and each information segment is One terminal device in the terminal device group corresponds to (information segment #1 shown in FIG.
  • each information segment is used to determine the slot format of the terminal device corresponding to the information segment.
  • each information segment can determine the time slot format of the terminal device corresponding to the information segment may be that each information segment includes the time slot format indication information of the terminal device corresponding to the information segment, or, each information segment and the information The time slot format indication information of the terminal device corresponding to the segment corresponds.
  • each first indication information includes N pieces of information corresponding to N terminal devices included in one terminal device group of M terminal device groups (as shown in FIG. 7(b), each of the first Each of the indication information includes information segment #1 to information segment #N), and each information segment is used to determine the time slot format of the terminal device in the terminal device group corresponding to the information segment.
  • a first indication information can directly indicate the time slot format corresponding to all terminal equipment in a terminal equipment group, so that when the network equipment covers
  • the network device sends M first messages and carries the first indication information in each first message.
  • N1 is equal to 1, and the network device configures the slot format for the terminal devices in the first terminal device group through the first indication information.
  • the first terminal device group is composed of N2 terminal devices that perform side link multicast communication.
  • the first indication information includes N pieces of information, and the N pieces of information correspond one-to-one to the N terminal devices in the first terminal device group, and N is a positive integer less than N2.
  • the first indication information carried in the downlink control information includes N information segments (information segment #1 to information segment #N shown in FIG. 7(c)), and each information segment is One terminal device in the terminal device group corresponds to (information segment #1 shown in FIG. 7(c) corresponds to terminal device #1, information segment #2 corresponds to terminal device #2, ..., information segment #N Corresponding to terminal device #N), each information segment is used to determine the slot format of the terminal device corresponding to the information segment.
  • the network device configures a slot format for the N2 terminal devices included in the first terminal device group, and needs to pass 2 downlink control information (downlink control information #1 and downstream control information #2).
  • the first indication information carried in the downlink control information #1 includes N pieces of information corresponding to the terminal device #1-terminal device #N in the terminal device group, and the first indication information carried in the downlink control information #2 The included N pieces of information respectively correspond to terminal device #N+1-terminal device #N2 in the terminal device group.
  • Each first indication information includes N pieces of information corresponding to N terminal devices in one terminal device group of M terminal device groups (as shown in FIG. 7(d), each Each of the indication information includes information segment #1 to information segment #N), and each information segment is used to determine the slot format of the terminal device in the terminal device group corresponding to the information segment.
  • N2 may also be equal to 3N or other values.
  • N2 may also be equal to 3N or other values.
  • a first indication information can directly indicate the time slot format corresponding to a part of the terminal equipment in a terminal equipment group, so that when the network equipment covers
  • the network device needs to deliver M1 first messages and carry first indication information in each first message, and M1 is an integer greater than M. Then, in the second case, compared with the first case, there are more first messages to be delivered, and the resource overhead of the network device is larger.
  • the network device configures a slot format for N1 terminal device groups through the first indication information.
  • the first indication information carried in the downlink control information includes N1 information segments (information segment #1 to information segment #N1 shown in FIG. 7(e)), each information segment Corresponds to a terminal device group (information segment #1 shown in FIG. 7(e) corresponds to terminal device group #1, information segment #2 corresponds to terminal device group #2, ..., information segment #N1 corresponds to Terminal equipment group #N1 corresponds), each information segment is used to determine the slot format corresponding to the terminal equipment group corresponding to the information segment.
  • N1 pieces of information correspond to the N1 terminal equipment groups in one-to-one correspondence, where the N1 terminal equipment groups need to coordinate resources with each other.
  • a plurality of related terminal device groups in the side link communication system within the coverage of the network device may be divided into one area. It can be understood that the first indication information indicates the slot format of the terminal device in the terminal device group included in an area.
  • the second information segment in the N1 information segments indicates on which resources the terminal devices in the corresponding second terminal device group perform Transmission, but does not specifically indicate the slot format of the terminal devices in the second terminal device group.
  • the network device indicates the time slot format corresponding to the initiator terminal device in the second terminal device group through the second information segment, and the network device does not specify which of the plurality of terminal devices included in the second terminal device group One terminal device is the initiator terminal device.
  • the corresponding second information segment indicates that the transmission resource of the terminal device in the second terminal device group is TTTXXXTTXXXXXX; for the third terminal device group, the corresponding third information segment indicates The transmission resource of the terminal device in the third terminal device group is XXXTTTXXXXXTT; for the fourth terminal device group, the corresponding fourth information segment indicates that the transmission resource of the terminal device in the fourth terminal device group is XXXXXXTTTTTXX.
  • the network device will coordinate and allocate certain resources among the terminal device groups.
  • the transmission resources between the above-mentioned second terminal device group, third terminal device group, and fourth terminal device group are completely orthogonally coordinated in terms of time resources, so as to avoid mutual interference.
  • this application is not limited to this.
  • the transmission resources between the second terminal device group, the third terminal device group, and the fourth terminal device group may be not completely orthogonally coordinated in terms of time resources.
  • one first indication information can directly indicate the time slot format corresponding to multiple terminal device groups, so that when the network device covers the side link communication
  • the network device needs to send a first message and carry the first indication information in the first message. Then, in case 3, compared to case 1 and case 2, there are fewer first messages to be delivered, and the resource overhead of the network device is smaller.
  • a terminal device in a terminal device group learns the time slot format corresponding to the terminal device group to which it belongs, it can also learn the transmission resources of other terminal device groups in the same area with strong interference with itself, thereby When deciding the transmission state of symbols included in one time slot of oneself, the influence of surrounding terminal equipment groups can be considered.
  • the downlink control information is the DCI described above
  • the first indication information is information used to indicate a slot format
  • the DCI is used to carry slot format indication information.
  • DCI includes the following information:
  • DCI format identifier which can occupy one or more bits
  • the second DCI includes the following information:
  • DCI format identifier which can occupy one or more bits
  • the identifier of the starting terminal device in the information included in the above DCI is an item that needs to be added when the DCI size is insufficient, which will be described in detail in conjunction with specific scenarios below, and will not be repeated here.
  • three DCI includes the following information:
  • DCI format identifier which can occupy one or more bits
  • the SFI information of the terminal device group #1 refers to the transmission resource indication information of all terminal devices in the terminal device group #1.
  • the first indication information is the time slot format indication information of the terminal devices in the N1 terminal device group, and if the side devices in the terminal device group perform side link communication, the first indication information can be called Sidelink communication slot format indication (sidelink slot format indicator, SL-SFI) information.
  • Sidelink communication slot format indication sidelink slot format indicator, SL-SFI
  • N pieces of information correspond to N terminal devices, which may be one-to-one correspondence between N pieces of information and the identifiers of N terminal devices. Furthermore, in order to make the N pieces of information correspond to the identifications of the N terminal devices in one-to-one correspondence, the network device needs to determine the one-to-one correspondence between the N pieces of information and the identifications of the N terminal devices, and send the second Message, the second message includes a one-to-one correspondence between N pieces of information and the identifiers of N terminal devices. The second message may be semi-static signaling, or other messages for sending a one-to-one correspondence between N information segments and N terminal devices.
  • the second message may be RRC signaling, MAC signaling, or physical layer signaling; or, the second message may be any one determined by the network device to carry one-to-one between N pieces of information and N terminal devices Correspondence message.
  • the one-to-one correspondence between the N pieces of information and the identifiers of the N terminal devices is pre-configured in the network device and/or N terminal devices.
  • the one-to-one correspondence between the information segments described in the full text and the identification of the terminal device may also be referred to as a one-to-one correspondence between the location of the information containing SFI information in the downlink control information and the identification of the terminal device.
  • the terminal device can determine the information segment corresponding to the terminal device according to the identifier of the terminal device.
  • the terminal device can determine the information segment corresponding to the terminal device according to the identifier of the terminal device in the following ways:
  • Each information segment in the first indication information includes an identifier of a terminal device, indicating that each information segment includes SFI information of the terminal device indicated by the identifier of the terminal device.
  • FIG. 8 is a schematic diagram of a one-to-one correspondence between an information segment and a terminal device provided by an embodiment of the present application.
  • the schematic diagram includes information segment #1 ⁇ information segment#N, and each information segment includes the identification of the terminal device (terminal device #1 ⁇ terminal device#N shown in FIG. 8) and the SFI information corresponding to the terminal device (FIG. 8 SFI#1 to SFI#N shown). That is, it can indicate which terminal device's SFI information is included in each information segment.
  • FIG. 9 is a schematic diagram of another one-to-one correspondence between the information segment and the terminal device provided by the embodiment of the present application.
  • the schematic diagram includes information segment #1 to information segment #N, and each information segment includes SFI information corresponding to the terminal device in the terminal device group (SFI#1 to SFI#N shown in FIG. 9); information segment #N+ 1 to information segment #2N, each information segment includes the identification of the terminal device corresponding to information segment #1 to information segment #N (terminal device #1 to terminal device #N shown in FIG. 9). That is, a correspondence between the identification of the terminal device and the information segment including the SFI information of the terminal device can be established.
  • Information segment #1 to information segment #N and information segment #N+1 to information segment #2N in FIG. 9 can be reversed.
  • Information segment #1 to information segment #N in FIG. 9 can also be called sub information segment #1 to sub information segment #N under one information segment;
  • information segment #N+1 to information segment #2N can also be called Sub information segment #N+1 to sub information segment #2N under one information segment.
  • the sequence of the identification of the terminal device corresponding to each information segment in the first indication information is preset, and only the SFI corresponding to the terminal device needs to be included in each information segment, without the need to carry the terminal device as shown in FIGS. 8 and 9 Logo.
  • the terminal device #1 is a terminal device identified as 1, that is, the terminal device #1 acquires the information segment #1, and acquires its own SFI information from the information segment #1.
  • the terminal device identifier 1 may not be carried in the downlink control information, and the preset ascending order may be notified to N terminal devices through semi-static signaling, or may be pre-configured in the network device and/or N terminal devices.
  • the terminal device #1 is a terminal device identified as 1, that is, the terminal device #1 acquires the information segment #N, and acquires its own SFI information from the information segment #N.
  • the identifier N of the terminal device may not need to be carried in the downlink control information, and the preset descending order may be notified to the N terminal devices through semi-static signaling, or may be pre-configured in the network device and/or N terminal devices.
  • the terminal device #1 is a terminal device identified as 1, that is, the terminal device #1 acquires the information segment #1, and acquires its own SFI information from the information segment #1.
  • the terminal device identifier P and the ascending order can be notified to N terminal devices through semi-static signaling, or pre-configured in the network device and/or N terminal devices.
  • the identifier of the terminal device starts from P in descending order, and the terminal device correspondingly acquires the information segment according to its own identifier.
  • the terminal device #1 is a terminal device identified as 1, that is, the terminal device #1 acquires the information segment #P, and acquires its own SFI information from the information segment #P.
  • the identifier P and the descending order of the terminal devices may be notified to N terminal devices through semi-static signaling, or may be pre-configured in the network device and/or N terminal devices.
  • the order of the identification of the terminal device corresponding to each piece of information in the first indication information may be in a certain predefined order, or in a discontinuous ascending order, or in a discontinuous descending order, etc. These can be used as examples, no longer List them one by one.
  • the network device determines a one-to-one correspondence between the identifiers of N terminal devices and N information segments, and notifies the N terminal devices of the one-to-one correspondence through a second message, where the second message may be semi-static signaling .
  • the one-to-one correspondence between the identifiers of the N terminal devices and the N pieces of information is pre-configured in the network device and/or N terminal devices. Then, the terminal device can acquire the information segment corresponding to the identifier of the terminal device according to the one-to-one correspondence between its own identifier and the information segment.
  • the identifier of the terminal device mentioned above is the relative identifier of the terminal device in the terminal device group to which it belongs.
  • a terminal device group includes 16 terminal devices, and the numbers from 1 to 16 respectively identify the 16 terminal devices.
  • N1 information segments correspond to N1 terminal device groups
  • N1 information segments may correspond to identifiers of N1 terminal device groups.
  • determining the information segment corresponding to the terminal device group according to the identifier of the terminal device group includes the following ways:
  • Each information segment in the first indication information includes an identifier of a terminal device group, indicating that each information segment includes SFI information of the terminal device group indicated by the identifier of the terminal device group.
  • FIG. 10 is a schematic diagram of a one-to-one correspondence between an information segment and a terminal device group provided by an embodiment of the present application.
  • the schematic diagram includes information segment #1 to information segment #N1, and each information segment includes the corresponding terminal device group identifier (terminal device group #1 to terminal device group #N1 shown in FIG. 10) and the terminal device group.
  • SFI information (SFI#1 to SFI#N1 shown in FIG. 10). That is, it can indicate which terminal device group SFI information is included in each information segment.
  • FIG. 11 is a schematic diagram of another one-to-one correspondence between an information segment and a terminal device group provided by an embodiment of the present application.
  • the schematic diagram includes information segment #1 to information segment #N1, and each information segment includes SFI information corresponding to the terminal device group (SFI#1 to SFI#N1 shown in FIG. 11); information segment #N1+1 to information segment #2N1, each information segment includes the identification of the terminal device group corresponding to information segment #1 to information segment #N1. That is, a correspondence between the identification of the terminal device group and the information segment including the SFI information of the terminal device group can be established.
  • Information segment #1 to information segment #N1 and information segment #N1+1 to information segment #2N1 in FIG. 11 can also be called sub information segment #1 to sub information segment #N1 under one information segment; information segment #N1+1 to information segment #2N1 can also be called Sub information segment #N1+1 to sub information segment #2N1 under one information segment.
  • the sequence of the identification of the terminal device group corresponding to each information segment in the first indication information is preset, and only the SFI corresponding to the terminal device group needs to be included in each information segment, and there is no need to carry the terminal as shown in FIGS. 10 and 11 The ID of the device group.
  • the identification of the terminal device group starts from 1 in ascending order, and the terminal devices in the terminal device group acquire the information segment correspondingly according to the identification of the terminal device group to which they belong.
  • the terminal device group #1 is the terminal device group identified as 1, that is, the terminal device in the terminal device group #1 acquires the information segment #1, first obtains the SFI information of the terminal device group #1 from the information segment #1, and then Determine your own SFI based on automatic detection results or resource allocation.
  • the identifier 1 of the terminal device group may not need to be carried in the downlink control information, and the preset ascending order may notify the terminal devices in the N1 terminal device group through semi-static signaling, or pre-configured in the network device and/or N1 Terminal devices in a group of terminal devices.
  • the identification of the terminal device group starts from N1 in descending order, and the terminal devices in the terminal device group acquire the information segment correspondingly according to the identification of the terminal device group to which they belong.
  • the terminal device group #1 is the terminal device group identified as 1, that is, the terminal device in the terminal device group #1 obtains the information segment #N1, first obtains the SFI information of the terminal device group #1 from the information segment #N1, and then Determine your own SFI based on automatic detection results or resource allocation.
  • the identifier N1 of the terminal device group may not need to be carried in the downlink control information, the preset descending order may notify the terminal devices in the N1 terminal device group through semi-static signaling, or may be pre-configured in the network device and/or N1 Terminal devices in a group of terminal devices.
  • the identification of the terminal device group starts from P in ascending order, and the terminal devices in the terminal device group correspondingly acquire the information segment according to the identification of the terminal device group to which they belong.
  • the terminal device group #1 is the terminal device group identified as 1, that is, the terminal device in the terminal device group #1 acquires the information segment #1, first obtains the SFI information of the terminal device group #1 from the information segment #1, and then Determine your own SFI based on automatic detection results or resource allocation.
  • the terminal device group identifier P and the ascending order can be notified to the terminal devices in the N1 terminal device group through semi-static signaling, or pre-configured in the network device and/or the terminal devices in the N1 terminal device group.
  • the identification of the terminal device group starts from P in descending order, and the terminal devices in the terminal device group correspondingly acquire the information segment according to the identification of the terminal device group to which they belong.
  • the terminal device group #1 is the terminal device group identified as 1, that is, the terminal device in the terminal device group #1 acquires the information segment #P, first obtains the SFI information of the terminal device group #1 from the information segment #P, and then Determine your own SFI based on automatic detection results or resource allocation.
  • the terminal device group identifier P and the descending order can be notified to the terminal devices in the N1 terminal device group through semi-static signaling, or pre-configured in the network device and/or the terminal devices in the N1 terminal device group.
  • the order of the identification of the terminal device group corresponding to each piece of information in the first indication information may be in a certain predefined order, or in a discontinuous ascending order, or in a discontinuous descending order, etc. These can be used as examples, not List them one by one.
  • the network device determines the one-to-one correspondence between the identifiers of the N1 terminal device groups and the N1 information segments, and notifies the terminal devices in the N1 terminal device group of the one-to-one correspondence through a third message, where the third message It can be semi-static signaling.
  • the one-to-one correspondence between the identifiers of the N1 terminal device groups and the N1 information segments is pre-configured in the network device and/or the terminal devices in the N1 terminal device group. Then, the terminal device can obtain the information segment corresponding to the identifier of the terminal device group according to the one-to-one correspondence between the identifier of the terminal device group to which it belongs and the information segment, and further obtain its own SFI information.
  • the network device After the network device determines the downlink control information, it sends the downlink control information to the terminal device group that needs to configure the slot format, and executes S120.
  • the network device may perform signaling interaction with terminal devices in at least one terminal device group, so as to configure a slot format.
  • the method for side link communication provided by the embodiment of the present application will be described in detail.
  • first terminal device group may be any terminal device group in the at least one terminal device group, and the "first" is only used for distinguishing descriptions, and should not constitute any limitation to this application.
  • the network device sends downlink control information to the first terminal device group.
  • the network device sends downlink control information to the terminal devices in the first terminal device group, where the downlink control information carries first indication information, and the first indication information includes N pieces of information , N information segments correspond to N terminal devices in the first terminal device group one by one, and the N information segments respectively include time slot format indication SFI information corresponding to N terminal devices.
  • the first terminal device group is any one of multiple terminal device groups that need to be configured with a time slot format.
  • the network device sends downlink control information to the terminal device of the first terminal device group among the N1 terminal device groups, where the downlink control information carries first indication information, and the first indication information includes N1 N1 information segments correspond to the N1 terminal equipment groups one by one, and the N1 information segments respectively include time slot format indication SFI information corresponding to the N1 terminal equipment groups.
  • the SFI information included in each information segment may be a table for determining SFI configured in advance through RRC signaling, and the table contains the actual transmission status (sending status, receiving status, or unknown) of the SFI index and symbols State). Therefore, the SFI information included in the information segment is each SFI index.
  • the table for determining SFI is a combined table of slot format specific to the terminal device configured for the side link.
  • the SFI information contained in each information segment may also be a bitmap of a preset length.
  • the above-mentioned preset length may be notified by the network device to the terminal device in the terminal device group through RRC signaling; or, the preset length may also be preset in the network device and the terminal device.
  • the above-mentioned bitmap of the preset length represents an indication of the actual transmission state (sending state, receiving state, or unknown state) of the distinguished symbol within a certain time range from the first moment. Therefore, the SFI information included in the information segment is each SFI bitmap.
  • the network device scrambles the downlink control information before sending the downlink control information. Specifically, the network device defines a first identifier, and the downlink control information is scrambled by the first identifier.
  • the first identifier is predefined by the network device.
  • the network device notifies N terminal devices in the above terminal device group through semi-static signaling, so that all N terminal devices can learn the first identifier in advance.
  • the first identifier is pre-configured, and pre-configuration refers to being preset in the network device and/or N terminal devices.
  • each downlink control information carrying the first indication information may pass the radio network temporary identifier of the terminal equipment group corresponding to the terminal equipment group to which the terminal equipment corresponding to the information segment included in the first indication information belongs.
  • RNTI radio network temporary identifier of the terminal equipment group corresponding to the terminal equipment group to which the terminal equipment corresponding to the information segment included in the first indication information belongs.
  • different downlink control information sent by the network device for different groups of terminal devices may be scrambled by the same first identifier.
  • the network device defines a common first identifier for multiple terminal device groups. Further, a plurality of terminal device groups are distinguished by position offset or time offset. This can reduce the number of scrambling first identifiers required.
  • the position offset refers to an offset in the frequency domain position of control information transmission in the first search space
  • the time offset refers to an offset in time of transmission of control information in the first search space.
  • the time slot format needs to be configured.
  • the network equipment sends downlink control information to the terminal equipment in each terminal equipment group, that is, the network equipment targets the terminal.
  • the device group #1-terminal device group #30 delivers downlink control information #1-downlink control information #30, respectively.
  • the downlink control information #1-downlink control information #5 is scrambled by the first identifier #1
  • the downlink control information #6- downlink control information #10 is scrambled by the first identifier #1
  • ... downlink control information #26-Downlink control information #30 is scrambled by the first identifier #6.
  • the number of first identifiers required for scrambling downlink control information is reduced from 30 to 6.
  • the terminal equipment group #1-terminal equipment group #5 can be distinguished by position offset or time offset .
  • the terminal device can know which group corresponds to the first indication information, thereby reducing the number of required first identifiers At the same time, correctly configure the slot format of the terminal devices in multiple terminal device groups.
  • the terminal device can know which group corresponds to the first indication information, thereby reducing the number of required first identifiers At the same time, correctly configure the slot format of the terminal devices in multiple terminal device groups.
  • the indication of the downlink control information may also be jointly combined with the position offset and the time offset.
  • the method is similar and will not be listed in detail.
  • the first identifier is predefined by the network device.
  • the network device notifies the terminal devices in the N1 terminal device group through semi-static signaling, so that the terminal devices in the N1 terminal device group can learn the first identifier in advance.
  • the first identifier is pre-configured, and the pre-configuration refers to the terminal devices that are preset in the network device and/or N1 terminal device groups.
  • a zone RNTI may be defined for the zone, where the zone RNTI may also be called zone-RNTI.
  • the downlink control information carrying the first indication information may be scrambled through a predefined area RNTI.
  • the scrambled downlink control information described in this application refers to scrambling the cyclic redundancy check (CRC) part of the downlink control information.
  • CRC cyclic redundancy check
  • the network device defines a first search space of the SL, and sends third indication information to the terminal devices in the N1 terminal device group, where the third indication information is used to indicate The first search space.
  • the third indication information may be semi-static signaling. It is also possible to configure a control resource set (CORSET) for SL-specific SFI detection, for example, to send fourth indication information to terminal devices in N1 terminal device groups, where the fourth indication information is used to indicate Describing CORSET. It is also possible to configure a control channel element (control channel element, CCE) in a CORSET or in different CORSET for SFI detection of different terminal equipment groups.
  • CCE control channel element
  • the downlink control information due to the load limitation of the downlink control information, the SFI information of all the terminal devices included in the terminal device group cannot carry the downlink control information, then the downlink control information also includes the second indication information ,
  • the second indication information is used to identify the N terminal devices. That is, the downlink control information includes second indication information that can determine which terminal devices in the terminal device group are configured with a slot format.
  • the second indication information may be an identifier including each of the N terminal devices as shown in FIGS. 8 and 9.
  • the second indication information may indicate the identity of the terminal device that can be indicated through a position offset or a time offset.
  • one downlink control information can carry the time slot format indication information of up to 16 terminal devices, then the position offset can be 1 Detect the first part of the 30 terminal devices, that is, the time slot format indication information corresponding to 1-16 terminal devices, and detect the second part of the 30 terminal devices, ie 17-30, at a position offset of 2. Time slot format indication information corresponding to the terminal device.
  • the detection time domain offsets are different so that the first part and the second part of the 30 terminal devices are detected separately.
  • the first part of the 30 terminal devices is detected when the time domain offset is 1, that is, the time slot format indication information corresponding to 1-16 terminal devices, and the 30 terminal devices are detected when the time domain offset is 2.
  • the second part of the time slot format indication information corresponding to 17-30 terminal devices.
  • the second indication information includes the identification of the starting terminal device among the N terminal devices. That is, the second indication information is to indicate the N terminal devices by adding an extra field to the downlink control information.
  • this field is used to indicate the identification of the starting terminal device among the N terminal devices that can be indicated by the downlink control information, that is, the first indication information carried in the downlink control information can indicate the start of the index of the terminal device indicated by this field
  • the identifiers of multiple terminal devices included therein and the order of the identification sizes of different terminal devices are known by the network device and the terminal devices. Then, only the identifiers of the starting terminal devices among the N terminal devices may be indicated, and the N terminal devices are determined according to the identifiers of the starting terminal devices in a known order.
  • FIG. 12 is a schematic diagram of a format of second indication information provided by the present application.
  • the schematic diagram includes a first row and a second row, where the first row is downlink control information, and the second row is the terminal device in the terminal device group corresponding to the information segment included in the first indication information carried in the downlink control information.
  • a bit X is added to the downlink control information, which indicates that the first indication information included in the downlink control information starts to configure the time slot format from the Xth terminal device identified as X.
  • the first indication information included in the downlink control information is configured from the ninth terminal device, so the first information segment in the first indication information includes the first The SFI information of 9 terminal devices, the second information segment includes the SFI information of the 10th terminal device, and so on.
  • the downlink control information further includes fourth indication information, and the fourth indication information is used to identify the N1 terminal device groups. That is, the downlink control information includes fourth indication information that can determine which terminal device group is configured with a slot format.
  • the fourth indication information is similar to the above-mentioned second indication information, and will not be repeated here.
  • the terminal device obtains SFI information.
  • the network device sends downlink control information to the terminal devices in the first terminal device group, and scrambles the downlink control information through the first identifier.
  • the first terminal device in the terminal device group acquires corresponding SFI information as an example for description.
  • the first terminal device is any one of the N terminal devices in the terminal device group.
  • the first information segment included in the first indication information carried in the downlink control information includes SFI information of the first terminal device, and the first terminal device according to the one-to-one between the identifier of the first terminal device and the first information segment For the correspondence, obtain the first information segment corresponding to the first terminal device, and further obtain the SFI information included in the first information segment.
  • SFI information included in different information segments may indicate different time slot formats.
  • the network device sends downlink control information to terminal devices in N1 terminal device groups, and scrambles the downlink control information by using the first identifier.
  • the first terminal device group among the N1 terminal device groups obtains corresponding SFI information as an example for description.
  • the first information segment included in the first indication information carried in the downlink control information includes the SFI information of the first terminal device group, and the first terminal device group according to the identifier of the first terminal device group and the first information segment To obtain the first information segment corresponding to the first terminal device group, and further obtain the SFI information included in the first information segment.
  • the SFI information of the first terminal equipment group indicates the time slot format corresponding to the terminal equipment in the first terminal equipment group that sends information, which can be understood as the SFI information of the first terminal equipment group indicates the information sent in the first terminal equipment group
  • the time slot format of the terminal device of the terminal but does not specify which terminal device in the first terminal device group is the terminal device that sends the information.
  • the transmission method in which the terminal device in the first terminal device group starts automatic detection is detected on the time slot format indicated by the SFI information of the first terminal device group
  • For the resources that can be transmitted determine the respective time slot format according to the detection result, that is, the different terminal devices in the first terminal device group have an equal competition relationship, and strive to transmit on the time slot format indicated by the SFI information;
  • the first terminal device group is provided with a master terminal device, and the master terminal device performs resource allocation according to the time slot format indicated by the acquired SFI information included in the first information segment, and allocates resources to the first terminal device group
  • the master terminal device performs resource allocation according to the time slot format indicated by the acquired SFI information included in the first information segment, and allocates resources to the first terminal device group
  • Different terminal devices in which the main terminal device may be referred to as a group leader in the first terminal device group.
  • the first terminal equipment group may also acquire SFI information of other terminal equipment groups in the same area, that is, the first terminal equipment group can acquire the SFI information carried in the downlink control information.
  • the SFI information of the terminal device group corresponding to the information segment included in the first indication information. That is to say, when the first terminal equipment group learns its own SFI information, it can also know the SFI information of the terminal equipment group that strongly interferes with the first terminal equipment group, so as to determine the different terminal equipment in the first terminal equipment group group. In the transmission state, the influence of the strong interference terminal equipment group can be considered.
  • the configuration information of the semi-static signaling or the preset configuration involved in the foregoing may be at least one of RRC signaling, media access control (MAC) signaling, or physical layer signaling.
  • the method for lateral link communication provided by the present application is described in detail above with reference to FIGS. 6-12, and the method for lateral link communication provided by the present application will be briefly described below in conjunction with specific embodiments. Use flow in the scenario of multi-cast.
  • FIG. 13 is a schematic diagram of an indication time slot format provided by this application.
  • the schematic diagram includes the left side and the right side, where the left side is a different DCI and the right side is a different terminal device group.
  • each terminal device group includes 20 Terminal devices
  • the identification of 20 terminal devices is terminal device #1 ⁇ terminal device #20. Due to the size limitation of DCI, one DCI can only indicate the SFI information corresponding to 10 terminal devices in the terminal device group, that is, the slot format joint indication information carried in the DCI only includes 10 information segments, namely, information segment #1 ⁇ information segment #10, 10 pieces of information correspond to 10 terminal devices.
  • the network device issues two DCIs for each terminal device group.
  • Each DCI includes 10 pieces of information, which are used to indicate a terminal device group. SFI information of 10 terminal devices.
  • first DCI and second DCI as shown in FIG. 13 when two DCIs (first DCI and second DCI as shown in FIG. 13) are delivered to group#1, where the first DCI indicates when terminal device #1 to terminal device #10 in group#1
  • the slot format the first DCI indicates the slot format of terminal equipment #11 to terminal equipment #20 in group#1.
  • the second DCI needs to carry the indicated identifier of the starting terminal device (terminal device #11).
  • the network device respectively scrambles the DCI corresponding to the two terminal device groups with the group-RNTI of the two terminal device groups. Then, when the terminal device in each group multicast receives the corresponding DCI, it can analyze the DCI based on the group-RNTI.
  • the network device determines the one-to-one correspondence between the 10 information segments and the identifiers of the ten terminal devices, and notifies the ten terminals through semi-static signaling equipment. Then, when receiving the DCI, 10 terminal devices can obtain corresponding information segments based on the one-to-one correspondence and their own identifiers.
  • the identifier of the terminal device is the relative identifier of the terminal device in the terminal device group to which it belongs.
  • the second DCI includes the following information:
  • DCI format identifier which can occupy one or more bits
  • Information segment #1 (SFI information corresponding to terminal device #11), information segment #2 (SFI information corresponding to terminal device #12), ..., information segment #10 (SFI information corresponding to terminal device #20).
  • the schematic diagram includes a first row and a second row, where the first row is DCI and the second row is different terminal device groups.
  • the identifiers of the two terminal device groups are group#1 and group#2, and each terminal device group includes 20 Terminal devices, the identification of 20 terminal devices is terminal device #1 ⁇ terminal device #20.
  • the DCI includes two pieces of information corresponding to two terminal device groups, and is used to indicate the slot format corresponding to the terminal device group.
  • the network device defines the RNTI that scrambles the DCI, and the RNTI notifies the terminal device through semi-static signaling. Then, when receiving the DCI, the terminal device can analyze the DCI based on the RNTI.
  • the network device determines the one-to-one correspondence between the two pieces of information and the identifiers of the two terminal equipment groups, and notifies the terminal equipment of the one-to-one correspondence through semi-static signaling. Then, when receiving the DCI, the terminal device group can obtain the corresponding information segment based on the one-to-one correspondence and the identifier of the terminal device group.
  • the DCI includes the following information:
  • DCI format identifier which can occupy one or more bits
  • FIG. 15 is a schematic diagram of an apparatus 10 for side link communication proposed in this application.
  • the device 10 includes a receiving unit 110 and a processing unit 120.
  • the receiving unit 110 is configured to receive downlink control information sent by a network device; the downlink control information carries first indication information, where the first indication information is used to indicate a slot format corresponding to N1 terminal device groups, one
  • the terminal device group includes a plurality of terminal devices that perform side link multicast communication, and N1 is a positive integer.
  • the processing unit 120 is configured to parse the downlink control information.
  • the device 10 corresponds exactly to the terminal device in the method embodiment, and the corresponding unit of the device 10 is used to perform the corresponding steps performed by the terminal device in the method embodiment shown in FIG. 6.
  • the receiving unit 110 in the device 10 executes the steps received in the method embodiment. For example, execute the downlink control information received from the network device in FIG. 6.
  • the processing unit 120 executes steps internally implemented or processed in the terminal device in the method embodiment. For example, the analysis of the downlink control information in FIG. 6 is performed.
  • the apparatus 10 may further include a sending unit 130, configured to send information to other devices.
  • the receiving unit 110 and the transmitting unit 130 may constitute a transceiving unit, and have functions of receiving and transmitting at the same time.
  • the processing unit 120 may be a processor.
  • the receiving unit 110 may be a receiver.
  • the sending unit 130 may be a transmitter. The receiver and transmitter can be integrated together to form a transceiver.
  • FIG. 16 is a schematic structural diagram of a terminal device 20 applicable to an embodiment of the present application.
  • the terminal device 20 can be applied to the system shown in FIG. 1.
  • FIG. 16 shows only the main components of the terminal device.
  • the terminal device 20 includes a processor, a memory, a control circuit, an antenna, and input/output devices.
  • the processor is used to control the antenna and the input and output devices to send and receive signals.
  • the memory is used to store a computer program.
  • the processor is used to call and run the computer program from the memory to perform the method for side link communication proposed by the application. The corresponding processes and/or operations performed by the equipment. I won't repeat them here.
  • FIG. 16 only shows one memory and processor. In an actual terminal device, there may be multiple processors and memories.
  • the memory may also be referred to as a storage medium or a storage device, etc. This embodiment of the present application does not limit this.
  • FIG. 17 is a schematic diagram of an apparatus 30 for side link communication proposed by the present application.
  • the device 30 includes a sending unit 310 and a processing unit 320.
  • the processing unit 320 is configured to determine downlink control information that carries first indication information, where the first indication information is used to indicate a slot format corresponding to N1 terminal equipment groups, and one terminal equipment group includes N1 is a positive integer for multiple terminal devices that perform sidelink multicast communication;
  • the sending unit 310 is configured to send the downlink control information.
  • the device 30 corresponds exactly to the network device in the method embodiment, and the corresponding unit of the device 30 is used to perform the corresponding steps performed by the network device in the method embodiment shown in FIG. 6.
  • the sending unit 310 in the device 30 executes the steps sent by the network device in the method embodiment. For example, the step 120 of sending downlink control information to the terminal device in FIG. 6 is performed.
  • the processing unit 120 executes steps internally implemented or processed by the network device in the method embodiment. For example, the step 110 of determining downlink control information in FIG. 6 is performed.
  • the apparatus 30 may further include a receiving unit 330, configured to receive information sent by other devices.
  • the receiving unit 330 and the sending unit 310 may constitute a transceiving unit, and have both receiving and sending functions.
  • the processing unit 320 may be a processor.
  • the sending unit 310 may be a receiver.
  • the receiving unit 330 may be a transmitter. The receiver and transmitter can be integrated together to form a transceiver.
  • FIG. 18 is a schematic structural diagram of a network device 40 applicable to an embodiment of the present application, and may be used to implement the functions of the network device in the method for side link communication described above.
  • a network device 40 can be a schematic structural diagram of a base station.
  • the network device can be applied to the system shown in FIG.
  • the network device 40 may include one or more radio frequency units, such as a remote radio unit (RRU) 401 and one or more baseband units (BBU).
  • the baseband unit may also be referred to as a digital unit (DU) 402.
  • the RRU 401 may be called a transceiver unit, which corresponds to the sending unit 310 in FIG. 17.
  • the transceiver unit 401 may also be called a transceiver, a transceiver circuit, or a transceiver, etc., which may include at least one antenna 4011 and a radio frequency unit 4012.
  • the transceiving unit 401 may include a receiving unit and a transmitting unit.
  • the receiving unit may correspond to a receiver (or receiver, receiving circuit), and the transmitting unit may correspond to a transmitter (or transmitter, transmitting circuit).
  • the RRU 401 part is mainly used for the transmission and reception of radio frequency signals and the conversion of radio frequency signals and baseband signals, for example, for sending the control information described in the above embodiment to the terminal device.
  • the BBU 402 part is mainly used for baseband processing and controlling the base station.
  • the RRU 401 and the BBU 402 may be physically arranged together, or may be physically separated, that is, distributed base stations.
  • the BBU 402 is a control center of a network device, and may also be referred to as a processing unit. It may correspond to the processing unit 320 in FIG. 17 and is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, and spread spectrum.
  • the BBU (processing unit) 402 may be used to control the network device 40 to perform the operation flow on the network device in the above method embodiment, for example, to determine the length of the symbol carrying the control information of the terminal device.
  • the BBU 402 may be composed of one or more boards, and the plurality of boards may jointly support a wireless access network of a single access standard (for example, an LTE system or a 5G system), or may be supported separately. Wireless access networks with different access standards.
  • the BBU 402 also includes a memory 4021 and a processor 4022.
  • the memory 4021 is used to store necessary instructions and data.
  • the memory 4021 stores the codebook and the like in the above embodiment.
  • the processor 4022 is used to control the base station to perform necessary actions, for example, to control the base station to perform the operation flow on the network device in the foregoing method embodiment.
  • the memory 4021 and the processor 4022 may serve one or more single boards. In other words, the memory and processor can be set separately on each board. It is also possible that multiple boards share the same memory and processor. In addition, each board can also be equipped with necessary circuits.
  • the network device 40 shown in FIG. 18 can implement the network device functions involved in the method embodiments of FIGS. 6-17.
  • the operations and/or functions of each unit in the network device 40 are respectively for implementing the corresponding processes executed by the network device in the method embodiments of the present application. To avoid repetition, detailed description is omitted here as appropriate.
  • the structure of the network device illustrated in FIG. 18 is only one possible form, and should not constitute any limitation to the embodiments of the present application. This application does not exclude the possibility of other forms of network equipment structure that may appear in the future.
  • An embodiment of the present application further provides a communication system, which includes the foregoing network device and one or more terminal devices.
  • the present application also provides a computer-readable storage medium, the computer-readable storage medium stores instructions, and when the instructions run on the computer, the computer is allowed to perform the network device in the method shown in FIGS. 6-14 Steps performed.
  • the present application also provides a computer-readable storage medium, the computer-readable storage medium has instructions stored therein, and when the instructions run on the computer, it causes the computer to execute the terminal device in the method shown in FIGS. 6-14 Steps performed.
  • the present application also provides a computer program product containing instructions.
  • the computer program product runs on a computer, the computer program is caused to perform various steps performed by the network device in the method shown in FIGS. 6-14.
  • the present application also provides a computer program product containing instructions.
  • the computer program product runs on a computer, the computer is caused to perform various steps performed by the terminal device in the method shown in FIGS. 6-14.
  • the present application also provides a chip, including a processor.
  • the processor is used to read and run the computer program stored in the memory to perform the corresponding operations and/or processes performed by the terminal device in the method for side link communication provided by the present application.
  • the chip further includes a memory, the memory and the processor are connected to the memory through a circuit or a wire, and the processor is used to read and execute the computer program in the memory.
  • the chip further includes a communication interface, and the processor is connected to the communication interface.
  • the communication interface is used to receive data and/or information to be processed, and the processor obtains the data and/or information from the communication interface and processes the data and/or information.
  • the communication interface may be an input-output interface.
  • the present application also provides a chip, including a processor.
  • the processor is used to call and run the computer program stored in the memory to perform the corresponding operation and/or process performed by the network device in the method for side link communication provided by the present application.
  • the chip further includes a memory, the memory and the processor are connected to the memory through a circuit or a wire, and the processor is used to read and execute the computer program in the memory.
  • the chip further includes a communication interface, and the processor is connected to the communication interface.
  • the communication interface is used to receive data and/or information to be processed, and the processor obtains the data and/or information from the communication interface and processes the data and/or information.
  • the communication interface may be an input-output interface.
  • the processor may be a central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more technologies used to control the application Integrated circuits for program execution.
  • the processor may be a digital signal processor device, a microprocessor device, an analog-to-digital converter, a digital-to-analog converter, or the like.
  • the processor may allocate the functions of control and signal processing of the terminal device or the network device among these devices according to their respective functions.
  • the processor may have a function of operating one or more software programs, and the software programs may be stored in the memory.
  • the functions of the processor may be implemented by hardware, or may be implemented by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • the memory may be read-only memory (ROM), other types of static storage devices that can store static information and instructions, random access memory (random access memory, RAM), or other types of information and instructions that can be stored
  • Dynamic storage devices can also be electrically erasable programmable read-only memory (electrically erasable programmable-read-only memory (EEPROM), read-only compact disc (compact disc read-only memory, CD-ROM) or other optical disc storage, optical disc storage ( (Including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or can be used to carry or store the desired program code in the form of instructions or data structures Any other media accessed by the computer, etc.
  • EEPROM electrically erasable programmable read-only memory
  • compact disc compact disc read-only memory
  • CD-ROM compact disc read-only memory
  • optical disc storage (Including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs,
  • the memory and the memory involved in the foregoing embodiments may be physically independent units, or the memory may be integrated with the processor.
  • At least one refers to one or more, and “multiple” refers to two or more.
  • And/or describes the association relationship of the associated objects, indicating that there may be three relationships, for example, A and/or B, which may indicate the presence of A alone, A and B, and B alone. A and B can be singular or plural.
  • the character “/” generally indicates that the related object is a “or” relationship.
  • At least one of the following” and similar expressions refer to any combination of these items, including any combination of single items or plural items.
  • At least one of a, b, and c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, c may be single or multiple.
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are only schematic, for example, the division of units is only a logical function division, and there may be other division manners in actual implementation.
  • multiple units or components can be combined or integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical, or other forms.
  • the units described as separate components may not be physically separated, and the components displayed as units may not be physical units, that is, may be located in one place, or may be distributed on multiple network units. Part or all of the units may be selected according to actual needs to achieve the technical solution of the present application.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium.
  • the technical solution of the present application essentially or part of the contribution to the existing technology or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to enable a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and other media that can store program codes .

Abstract

本申请提供了一种用于侧行链路通信的方法、终端设备和网络设备。该用于侧行链路通信的方法包括：网络设备确定下行控制信息，在下行控制信息中携带第一指示信息，该第一指示信息用于指示N1个终端设备组对应的时隙格式，N1为正整数；网络设备向N1个终端设备组中的终端设备发送下行控制信息。本申请提供的技术方案网络设备可以为终端设备组中的终端设备配置时隙格式。

Description

用于侧行链路通信的方法、网络设备以及终端设备
本申请要求于2018年12月29日提交中国专利局、申请号为201811641301.7、申请名称为“用于侧行链路通信的方法、网络设备以及终端设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，并且更具体地，涉及一种用于侧行链路通信的方法、网络设备以及终端设备。
背景技术
车联网(vehicle to everything，V2X)系统中的通信方式统称为V2X通信(X代表任何事物)。例如，该V2X通信包括：车辆与车辆(vehicle to vehicle，V2V)之间的通信，车辆与路边基础设施(vehicle to infrastructure，V2I)之间的通信、车辆与行人之间的通信(vehicle to pedestrian，V2P)或车辆与网络(vehicle to network，V2N)之间的通信等。V2X系统中所涉及的终端设备之间进行的通信被广泛称为侧行链路(slidelink，SL)通信。
在终端设备与网络设备或其他终端设备通信时，在时域上网络设备会为终端设备配置时隙格式，其中，时隙格式能够指示终端设备在一个时隙内多个符号上终端设备的不同的传输状态。传输状态可以是上行传输状态、下行传输状态或灵活传输状态。具体地，在第五代新无线(5th generation new radio，5G NR)系统中，网络设备通过半静态或动态信令配置时隙的时隙格式(slot format，SF)。其中，动态配置指的是由下行控制信息(downlink control information，DCI)信令中的时隙格式指示(slot format indicator，SFI)进行时隙格式配置。终端设备组中的终端设备如何确定时隙格式，实现终端设备组中的终端设备之间的侧行链路组播通信，成为亟待解决的问题。
发明内容
本申请提供一种用于侧行链路通信的方法、网络设备以及终端设备，网络设备能够为终端设备组中的终端设备配置时隙格式，实现终端设备组中的终端设备之间的侧行链路组播通信。
第一方面，提供了一种用于侧行链路通信的方法，包括：网络设备确定下行控制信息，所述下行控制信息携带第一指示信息，其中，所述第一指示信息用于指示N1个终端设备组对应的时隙格式，一个终端设备组包括多个进行侧行链路组播通信的终端设备，N1为正整数；所述网络设备发送所述下行控制信息。
根据本申请实施例的用于侧行链路通信的方法，通过使网络设备下发的下行控制信息中携带的第一指示信息，其中，第一指示信息指示终端设备组对应的时隙格式，能够针对终端设备组实现时隙格式的配置。
应理解，本申请实施例中所涉及的信息段指的是下行控制信息中携带的第一指示信息所包括的部分信息，还可以称之为信息段、信息域、信息位置、信息单元或者字段等。
结合第一方面，在第一方面的某些实现方式中，所述N1等于1；所述第一指示信息用于指示N1个终端设备组对应的时隙格式，包括：所述第一指示信息用于指示第一终端设备组中的N个终端设备对应的时隙格式，所述第一指示信息包括N个信息段，所述N个信息段中的一个信息段用于指示所述第一终端设备组中的一个终端设备对应的时隙格式。
根据本申请实施例的用于侧行链路通信的方法，下行控制信息中携带的第一指示信息可以用于指示一个终端设备组中的N个终端设备对应的时隙格式，实现为一个终端设备组中的终端设备配置时隙格式。
应理解，上述的一个终端设备组中的N个终端设备，可以是该终端设备组中的一部分终端设备，也可以是该终端设备组中的全部终端设备。
例如，该终端设备组中由N2个进行侧行链路组播通信的终端设备组成，其中，N2为大于2且大于或者等于N的整数。
结合第一方面，在第一方面的某些实现方式中，所述N1大于1；所述第一指示信息用于指示所述N1个终端设备组对应的时隙格式，所述第一指示信息包括N1个信息段，所述N1个信息段中一个信息段用于指示所述N1个终端设备组中一个终端设备组对应的时隙格式。
根据本申请实施例的用于侧行链路通信的方法，下行控制信息中携带的第一指示信息可以用于指示多个终端设备组对应的时隙格式，实现为多个终端设备组配置时隙格式。
结合第一方面，在第一方面的某些实现方式中，所述N个信息段与所述N个终端设备的对应关系为预先配置的，或者，所述方法还包括：所述网络设备向所述N个终端设备发送第二消息，所述第二消息包括所述N个信息段与所述N个终端设备的对应关系。
根据本申请实施例的用于侧行链路通信的方法，网络设备可以建立N个信息段与所述N个终端设备的对应关系，并将该N个信息段与所述N个终端设备的对应关系通过第二消息通知N个终端设备；或者，该N个信息段与所述N个终端设备的对应关系预先配置在网络设备和/或N个终端设备中，使得N个终端设备能够获知N个信息段与所述N个终端设备的对应关系，基于该对应关系获取对应的信息段。
应理解，N个信息段与所述N个终端设备的对应关系为N个信息段与所述N个终端设备之间的一一对应关系，一个信息段用于指示与之满足该一一对应关系的一个终端设备的时隙格式。
还应理解，本申请实施例中N个信息段与所述N个终端设备之间的一一对应关系，可以是N个信息段与所述N个终端设备的标识之间的一一对应关系，其中，终端设备的标识为终端设备在所属的终端设备组中的相对标识或绝对标识。绝对标识可以为无线网络临时标识(radio network tempory identity，RNTI)。
结合第一方面，在第一方面的某些实现方式中，所述下行控制信息中还包括第二指示信息，所述第二指示信息用于标识所述N个终端设备。
根据本申请实施例的用于侧行链路通信的方法，可以通过在下行控制信息中携带第二指示信息，通知接收该下行控制信息的终端设备，第一指示信息中的信息段能够确定哪些 终端设备的时隙格式。
结合第一方面，在第一方面的某些实现方式中，所述第二指示信息包括所述N个终端设备中起始终端设备的标识；或者，所述第二指示信息包括所述N个终端设备中每个终端设备的标识。
根据本申请实施例的用于侧行链路通信的方法，第二指示信息可以是只指示N个终端设备中起始终端设备的标识，根据该起始终端设备的标识能够确定该N个终端设备；或者，第二指示信息可以是包括该N个终端设备中每个终端设备的标识。
结合第一方面，在第一方面的某些实现方式中，所述N1个信息段与所述N1个终端设备组的对应关系为预先配置的，或者，所述方法还包括：所述网络设备向所述N1个终端设备组中的终端设备发送第三消息，所述第三消息包括所述N1个信息段与所述N1个终端设备组的对应关系。
根据本申请实施例的用于侧行链路通信的方法，网络设备可以建立N1个信息段与所述N1个终端设备组的对应关系，并将该N1个信息段与所述N1个终端设备组的对应关系通过第二消息通知N1个终端设备组中的终端设备；或者，该N1个信息段与所述N1个终端设备组的对应关系预先配置在网络设备和/或N1个终端设备组中的终端设备中，使得N1个终端设备组中的终端设备能够获知N1个信息段与所述N1个终端设备组的对应关系，基于该对应关系获取所属终端设备组对应的信息段。
应理解，N1个信息段与所述N1个终端设备组的对应关系为N1个信息段与所述N1个终端设备组之间的一一对应关系，一个信息段用于指示与之满足该一一对应关系的一个终端设备组的时隙格式。
还应理解，本申请实施例中N1个信息段与所述N1个终端设备组之间的一一对应关系，可以是N1个信息段与所述N1个终端设备组的标识之间的一一对应关系，其中，终端设备组的标识为是在该网络设备覆盖范围内的侧行链路通信系统中能够唯一确定该终端设备组的信息。
结合第一方面，在第一方面的某些实现方式中，所述下行控制信息中还包括第四指示信息，所述第四指示信息用于标识所述N1个终端设备组。
根据本申请实施例的用于侧行链路通信的方法，可以通过在下行控制信息中携带第四指示信息，通知接收该下行控制信息的终端设备，第一指示信息中的信息段能够确定哪些终端设备组的时隙格式。
结合第一方面，在第一方面的某些实现方式中，所述第四指示信息包括所述N1个终端设备组中起始终端设备组的标识；或者，所述第四指示信息包括所述N1个终端设备组中每个终端设备组的标识。
结合第一方面，在第一方面的某些实现方式中，所述一个终端设备组对应的时隙格式为一个终端设备组中的作为发送方的终端设备对应的时隙格式。
根据本申请实施例的用于侧行链路通信的方法，网络设备通过一个第一指示信息中的信息段指示一个终端设备组对应的时隙格式时，该信息段指示的是该终端设备组中执行发送信息的终端设备对应的时隙格式，因为终端设备组中的终端设备之间的通信为组播通信，一个终端设备执行发送，该终端设备组中的其他终端设备执行接收。
结合第一方面，在第一方面的某些实现方式中，所述网络设备发送所述下行控制信息 之前，所述方法还包括：所述网络设备使用第一标识符加扰所述下行控制信息，其中，所述第一标识符为预先配置的或通过半静态信令通知的。
根据本申请实施例的用于侧行链路通信的方法，网络设备会对发送的下行控制信息基于第一标识符进行加扰，为了接收该下行控制信息的终端设备能够解析该下行控制信息，本申请中可以将第一标识符通过半静态信令通知给N1个终端设备组中的终端设备或该第一标识符为预先配置的。
结合第一方面，在第一方面的某些实现方式中，所述方法还包括：所述网络设备向所述N1个终端设备组中的终端设备发送第三指示信息，所述第三指示信息用于指示第一搜索空间，所述第一搜索空间为检测所述下行控制信息的搜索空间。
根据本申请实施例的用于侧行链路通信的方法，为了化简终端设备检测下行控制信息，网络设备确定第一搜索空间，并将该第一搜索空间通过第三指示信息通知终端设备。
第二方面，提供了一种一种用于侧行链路通信的方法，包括：终端设备接收网络设备发送的下行控制信息，所述下行控制信息携带第一指示信息，其中，所述第一指示信息用于指示N1个终端设备组对应的时隙格式，一个终端设备组包括多个进行侧行链路组播通信的终端设备，N1为正整数；所述终端设备解析所述下行控制信息。
根据本申请实施例的用于侧行链路通信的方法，通过使终端设备接收的下行控制信息中携带的第一指示信息，其中，第一指示信息指示终端设备组对应的时隙格式，能够针对终端设备组实现时隙格式的配置。
结合第二方面，在第二方面的某些实现方式中，所述N1等于1；所述第一指示信息用于指示N1个终端设备组对应的时隙格式，包括：所述第一指示信息用于指示第一终端设备组中的N个终端设备对应的时隙格式，所述第一指示信息包括N个信息段，所述N个信息段中的一个信息段用于指示所述第一终端设备组中的一个终端设备对应的时隙格式。
根据本申请实施例的用于侧行链路通信的方法，下行控制信息中携带的第一指示信息可以用于指示一个终端设备组中的N个终端设备对应的时隙格式，实现为一个终端设备组中的终端设备配置时隙格式。
结合第二方面，在第二方面的某些实现方式中，所述N1大于1；所述第一指示信息用于指示所述N1个终端设备组对应的时隙格式，所述第一指示信息包括N1个信息段，所述N1个信息段中一个信息段用于指示所述N1个终端设备组中一个终端设备组对应的时隙格式。
根据本申请实施例的用于侧行链路通信的方法，下行控制信息中携带的第一指示信息可以用于指示多个终端设备组对应的时隙格式，实现为多个终端设备组配置时隙格式。
结合第二方面，在第二方面的某些实现方式中，所述N个信息段与所述N个终端设备的对应关系为预先配置的，或者，所述方法还包括：所述终端设备接收所述网络设备发送的第二消息，所述第二消息包括所述N个信息段与所述N个终端设备的对应关系。
根据本申请实施例的用于侧行链路通信的方法，终端设备接收网络设备发送的携带该N个信息段与所述N个终端设备的对应关系的第二消息；或者，该N个信息段与所述N个终端设备的对应关系预先配置在网络设备和/或N个终端设备中，使得N个终端设备能够获知N个信息段与N个终端设备的对应关系，基于该对应关系获取对应的信息段。
结合第二方面，在第二方面的某些实现方式中，所述下行控制信息中还包括第二指示信息，所述第二指示信息用于标识所述N个终端设备。
根据本申请实施例的用于侧行链路通信的方法，可以通过在下行控制信息中携带第二指示信息，通知接收该下行控制信息的终端设备，第一指示信息中的信息段能够确定哪些终端设备的时隙格式。
结合第二方面，在第二方面的某些实现方式中，所述第二指示信息包括所述N个终端设备中起始终端设备的标识；或者，所述第二指示信息包括所述N个终端设备中每个终端设备的标识。
根据本申请实施例的用于侧行链路通信的方法，第二指示信息可以是只指示N个终端设备中起始终端设备的标识，根据该起始终端设备的标识能够确定该N个终端设备；或者，第二指示信息可以是包括该N个终端设备中每个终端设备的标识。
结合第二方面，在第二方面的某些实现方式中，所述N1个信息段与所述N1个终端设备组的对应关系为预先配置的，或者，所述方法还包括：所述终端设备接收所述网络设备发送的第三消息，所述第三消息包括所述N1个信息段与所述N1个终端设备组的对应关系。
根据本申请实施例的用于侧行链路通信的方法，终端设备接收网络设备发送的携带该N1个信息段与所述N1个终端设备组的对应关系的第三消息；或者，该N1个信息段与所述N1个终端设备组的对应关系预先配置在网络设备和/或N1个终端设备组中的终端设备中，使得N1个终端设备组中的终端设备能够获知N1个信息段与N1个终端设备组的对应关系，基于该对应关系获取所属的终端设备组对应的信息段。
结合第二方面，在第二方面的某些实现方式中，所述一个终端设备组对应的时隙格式为一个终端设备组中的作为发送方的终端设备对应的时隙格式；所述终端设备启动自动检测的传输方式在所述终端设备组对应的时隙格式上检测能够传输的资源，根据检测结果确定自身的时隙格式；或者，所述终端设备根据所述终端设备组对应的时隙格式，为所述终端设备组中的终端设备分配资源，确定自身的时隙格式。
根据本申请实施例的用于侧行链路通信的方法，网络设备通过一个第一指示信息中的信息段指示一个终端设备组对应的时隙格式时，该信息段指示的是该终端设备组中执行发送信息的终端设备对应的时隙格式，因为终端设备组中的终端设备之间的通信为组播通信，一个终端设备执行发送，该终端设备组中的其他终端设备执行接收。其中，该终端设备组中的终端设备启动自动检测的传输方式在所述终端设备组对应的时隙格式上检测能够传输的资源，根据该检测结果确定各自的时隙格式；或者，该终端设备组中包括主终端设备，主终端设备根据所述终端设备组对应的时隙格式，为所述终端设备组中的终端设备分配资源，从而确定该终端设备组中的终端设备的时隙格式。
结合第二方面，在第二方面的某些实现方式中，所述终端设备接收所述网络设备发送的所述下行控制信息之前，所述方法还包括：所述终端设备获取第一标识符，所述第一标识符用于加扰所述下行控制信息；所述终端设备获取第一标识符包括：所述第一标识为预先配置的，或者，所述终端设备接收所述网络设备发送的半静态信令，所述半静态信令中携带所述第一标识符。
根据本申请实施例的用于侧行链路通信的方法，终端设备通过接收网络设备下发的半 静态信令获取加扰下行控制信息的第一标识符，或者该加扰下行控制信息的第一标识符为预先配置的。
结合第二方面，在第二方面的某些实现方式中，所述方法还包括：所述终端设备接收所述网络设备发送的第三指示信息，所述第三指示信息用于指示第一搜索空间，其中，所述第一搜索空间为检测所述下行控制信息的搜索空间。
根据本申请实施例的用于侧行链路通信的方法，为了化简终端设备检测下行控制信息，终端设备通过接收第三指示信息确定检测下行控制信息的第一搜索空间。
第三方面，提供了一种网络设备，该网络设备可以用来执行第一方面及第一方面的任意可能的实现方式中的网络设备的操作。具体地，网络设备包括用于执行上述第一方面所描述的步骤或功能相对应的部件(means)可以是第一方面的网络设备。所述步骤或功能可以通过软件实现，或硬件实现，或者通过硬件和软件结合来实现。
第四方面，提供了一种终端设备，该终端设备可以用来用于执行第二方面及第二方面的任意可能的实现方式中的终端设备的操作。具体地，该终端设备可以包括用于执行上述第二方面所描述的步骤或功能相对应的部件(means)。所述步骤或功能可以通过软件实现，或硬件实现，或者通过硬件和软件结合来实现。
第五方面，提供了一种侧行链路通信装置，包括，处理器，存储器，该存储器用于存储计算机程序，该处理器用于从存储器中调用并运行该计算机程序，使得该侧行链路通信装置执行第一或第二方面中任一种可能实现方式中的用于侧行链路通信的方法。
一种可能的实现方式，所述处理器为一个或多个，所述存储器为一个或多个。
一种可能的实现方式，所述存储器可以与所述处理器集成在一起，或者所述存储器与处理器分离设置。
可选的，该侧行链路通信装置还包括，发射机(发射器)和接收机(接收器)。
第六方面，提供了一种系统，所述系统包括上述网络设备和终端设备。
第七方面，提供了一种计算机程序产品，所述计算机程序产品包括：计算机程序(也可以称为代码，或指令)，当所述计算机程序被运行时，使得计算机执行上述第一方面或第二方面中任一种可能实现方式中的方法。
第八方面，提供了一种芯片系统，包括存储器和处理器，该存储器用于存储计算机程序，该处理器用于从存储器中调用并运行该计算机程序，使得安装有该芯片系统的侧行链路通信装置执行上述第一方面至第二方面中任一种可能实现方式中的方法。
本申请实施例的用于侧行链路通信的方法、网络设备以及终端设备，通过使网络设备下发的下行控制信息中携带的第一指示信息指示至少一个终端设备组对应的时隙格式，进而能够为终端设备组中的终端设备配置时隙格式，实现终端设备组中终端设备之间的侧行链路组播通信。
附图说明
图1是现有技术中的V2X系统的示意图。
图2是适用于本申请实施例的通信系统的示意性框图。
图3中(a)-(c)是本申请实施例提供的终端设备组的示意图。
图4是一种侧行链路通信的时隙格式示意图。
图5是另一种侧行链路通信的时隙格式示意图。
图6是本申请实施例提供的一种用于侧行链路通信的方法示意图。
图7中(a)-(e)是本申请实施例提供的表示信息段与终端设备组相对应的示意图。
图8是本申请实施例提供的一种信息段与终端设备实现一一对应的示意图。
图9是本申请实施例提供的另一种信息段与终端设备实现一一对应的示意图。
图10是本申请实施例提供的一种信息段与终端设备组实现一一对应的示意图。
图11是本申请实施例提供的另一种信息段与终端设备组实现一一对应的示意图。
图12是本申请提供的一种第二指示信息的格式示意图。
图13是本申请提供的一种指示时隙格式的示意图。
图14是本申请提供的另一种指示时隙格式的示意图。
图15是本申请提出的用于侧行链路通信的装置10的示意图。
图16是适用于本申请实施例的终端设备20的结构示意图。
图17是本申请提出的用于侧行链路通信的装置30的示意图。
图18是适用于本申请实施例的网络设备40的结构示意图。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
本申请实施例的技术方案可以应用于各种通信系统，例如：全球移动通信(global system for mobile communications，GSM)系统、码分多址(code division multiple access，CDMA)系统、宽带码分多址(wideband code division multiple access，WCDMA)系统、通用分组无线业务(general packet radio service，GPRS)、长期演进(long term evolution，LTE)系统、LTE频分双工(frequency division duplex，FDD)系统、LTE时分双工(time division duplex，TDD)、通用移动通信系统(universal mobile telecommunication system，UMTS)、全球互联微波接入(worldwide interoperability for microwave access，WiMAX)通信系统、未来的第五代(5th generation，5G)系统或新无线(new radio，NR)等。
本申请实施例中的终端设备可以指用户设备、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置。终端设备还可以是蜂窝电话、无绳电话、会话启动协议(session initiation protocol，SIP)电话、无线本地环路(wireless local loop，WLL)站、个人数字助理(personal digital assistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备，未来5G网络中的终端设备或者未来演进的公用陆地移动通信网络(public land mobile network，PLMN)中的终端设备等，本申请实施例对此并不限定。
本申请实施例中的网络设备可以是用于与终端设备通信的设备，该网络设备可以是全球移动通信(global system for mobile communications，GSM)系统或码分多址(code division multiple access，CDMA)中的基站(base transceiver station，BTS)，也可以是宽带码分多址(wideband code division multiple access，WCDMA)系统中的基站(NodeB，NB)，还可以是LTE系统中的演进型基站(evolved NodeB，eNB或eNodeB)，还可以是云无线接入网络(cloud radio access network，CRAN)场景下的无线控制器，或者该网络设备可 以为中继站、接入点、车载设备、可穿戴设备以及未来5G网络中的网络设备或者未来演进的PLMN网络中的网络设备等，本申请实施例并不限定。
在本申请实施例中，终端设备或网络设备包括硬件层、运行在硬件层之上的操作系统层，以及运行在操作系统层上的应用层。该硬件层包括中央处理器(central processing unit，CPU)、内存管理单元(memory management unit，MMU)和内存(也称为主存)等硬件。该操作系统可以是任意一种或多种通过进程(process)实现业务处理的计算机操作系统，例如，Linux操作系统、Unix操作系统、Android操作系统、iOS操作系统或windows操作系统等。该应用层包含浏览器、通讯录、文字处理软件、即时通信软件等应用。并且，本申请实施例并未对本申请实施例提供的方法的执行主体的具体结构特别限定，只要能够通过运行记录有本申请实施例的提供的方法的代码的程序，以根据本申请实施例提供的方法进行通信即可，例如，本申请实施例提供的方法的执行主体可以是终端设备或网络设备，或者，是终端设备或网络设备中能够调用程序并执行程序的功能模块。
另外，本申请的各个方面或特征可以实现成方法、装置或使用标准编程和/或工程技术的制品。本申请中使用的术语“制品”涵盖可从任何计算机可读器件、载体或介质访问的计算机程序。例如，计算机可读介质可以包括，但不限于:磁存储器件(例如，硬盘、软盘或磁带等)，光盘(例如，压缩盘(compact disc，CD)、数字通用盘(digital versatile disc，DVD)等)，智能卡和闪存器件(例如，可擦写可编程只读存储器(erasable programmable read-only memory，EPROM)、卡、棒或钥匙驱动器等)。另外，本文描述的各种存储介质可代表用于存储信息的一个或多个设备和/或其它机器可读介质。术语“机器可读介质”可包括但不限于，无线信道和能够存储、包含和/或承载指令和/或数据的各种其它介质。
随着社会的不断发展，汽车的普及程度也越来越高，驾驶出行在给人们的出行带来便利的同时，也给人类社会带来一定负面影响，车辆数量迅速增加引起了城市交通拥堵、交通事故频发、环境质量变差等一系列问题。从人身安全、交通出行效率、环境保护以及经济效应等多方面来看，都需要一套完善的智能交通系统(intelligent transportation system，ITS)。而当前，ITS也理所当然的成为了全球关注热点。
目前，车辆可以通过V2V、V2I、V2P或者V2N通信方式，及时获取路况信息或接收服务信息，这些通信方式可以统称为V2X通信。
图1是现有技术中的V2X系统的示意图。该示意图包括V2V通信、V2P通信以及V2I/N通信。
如图1所示，车辆之间通过V2V通信。车辆可以将自身的车速、行驶方向、具体位置、是否踩了紧急刹车等信息广播给周围车辆，周围车辆的驾驶员通过获取该类信息，可以更好的感知视距外的交通状况，从而对危险状况做出提前预判进而做出避让；车辆与路侧基础设施通过V2I通信，路边基础设施，可以为车辆提供各类服务信息和数据网络的接入。其中，不停车收费、车内娱乐等功能都极大的提高了交通智能化。路边基础设施，例如，路侧单元(road side unit，RSU)包括两种类型：一种是终端设备类型的RSU。由于RSU分布在路边，该终端设备类型的RSU处于非移动状态，不需要考虑移动性；另一种是网络设备类型的RSU。该网络设备类型的RSU可以给与网络设备通信的车辆提供定时同步及资源调度。车辆与人(例如，车辆与行人、车辆与骑自行车的人、车辆与司机或车辆与乘客)通过V2P通信；车辆与网络通过V2N通信，V2N可以与上述的V2I统称为 V2I/N。
应理解，图1只是为了介绍V2X系统而示出的一种示例性的示意图，不对本申请构成任何限定。例如，车辆数量、行人数量以及基础设施的数量可以为多个，并不是图1中所示的数量。
图1简单介绍了现有技术中涉及的V2X系统，下面结合图2简单介绍本申请提供的实施所适用的场景。
图2所示为适用于本申请实施例的通信系统的示意性框图。如图2所示，在该通信系统100中，在传输数据之前，终端设备121与网络设备110可以通过信令交互确定用于与终端设备122传输数据所使用的资源，随后，该终端设备121使用确定的资源与该终端设备122通信；或者，在传输数据之前，终端设备122与网络设备110可以通过信令交互确定与终端设备121传输数据所使用的资源，随后，该终端设备122使用确定的资源与终端设备121通信。即，本申请实施例应用于侧行链路数据传输的应用场景中。
应理解，图2只是一种示意图不对本申请的保护范围构成任何限定。例如，图2中所示的终端设备的个数只是一种举例。
还应理解，在本申请中将上述的V2X系统中所涉及的终端设备之间进行通信称之为侧行链路通信不对本申请构成任何限定。例如，还可以将侧行链路通信称之为边链路通信、直通链路通信或者副链路通信等；另外，并不一定限制在V2X系统中，其他场景下，终端设备之间进行通信也可以称为侧行链路通信。
图2介绍了本申请实施例能够应用的场景，为了便于对本申请技术方案的理解，下面简单介绍本申请技术方案中涉及的几种基本概念。
一、时隙。
首先，应理解5G NR移动通信需要具备比第四代(4th generation，4G)移动通信更高的性能。
5G新无线接入技术(5th generation new radio access technology，5G NR RAT)中的第15版本协议定义了新的空口接入技术。该空口接入技术支持0.1～1千兆比特每秒(giga bit per second，Gbps)的用户体验速率、每平方公里一百万的连接数密度、毫秒级的端到端时延、每平方公里数十太比特每秒(tera bit per second，Tbps)的流量密度以及每小时500Km以上的移动性和数十Gbps的峰值速率。其中，用户体验速率、连接数密度和时延为5G最基本的三个性能指标。同时，5G还需要大幅提高网络设备部署和运营的效率，相比4G，频谱效率提升5～15倍，能效和成本效率提升百倍以上。
5G NR的三大应用场景包括增强移动宽带(enhanced mobile broadband，eMBB)、海量机器类型通信(massive machine-type-communications，mMTC)以及超高可靠低时延通信(ultra reliable and low latency communications，URLLC)。
其中，URLLC应用场景包括无人驾驶、工业控制等。该URLLC应用场景要求低时延高可靠。低时延的具体要求为端到端0.5ms时延，空口信息交互来回1ms时延；高可靠的具体要求为误块率(block error ratio，BLER)达到10^(-5)，即数据包正确接收比例达到99.999％。
在5G NR中，引入了多种子载波间隔，不同的载波可以有不同的子载波间隔。基线为15kHz，可以是15kHz*2^ n，n是整数，从3.75kHz、7.5kHz直到480kHz，最多8种。 对应不同的子载波间隔，有多种符号长度、时隙长度，如下表1所示。
表1
Figure PCTCN2019125954-appb-000001
表1中S指的是符号(symbol)。从表中可以看出，当子载波间隔为f0时对应的符号长度为载波间隔为f1时对应的符号长度的两倍、为载波间隔为f2时对应的符号长度的四倍。
应理解，表1只是一种示例性表格，用于说明对应不同的子载波间隔，有多种不同的符号长度。不对本申请构成任何限定。
时隙还可以有不同的时隙类型，不同的时隙类型包括的符号个数不一样。例如，迷你时隙(Mini slot)包含的符号个数小于7个，例如，Mini slot包含的符号个数为1个符号、2个符号、4个符号等；普通时隙(Slot)包含的符号个数为7个符号或14个符号。
下面以普通时隙包括14个符号为例说明本申请提供的用于侧行链路通信的方法。但是，本申请实施例中对时隙的具体形式并不限制。
二、时隙格式。
时域上，在5G NR中，一个时隙可以包含下行传输符号、灵活符号以及上行传输符号等作用其中的至少一个，而不同的时隙构成实现不同的功能。其中，不同的时隙的构成称为不同的时隙格式(slot format，SF)。其中，下行传输符号用于下行传输，上行传输符号用于上行传输，灵活符号用于方向可配置(可以被终端设备特定的无线资源控制(radio resource control，RRC)配置改变传输方向，或可以被下行控制信息(downlink control information，DCI)改变传输方向)，或者间隙(gap)，或者保护间隔(guard period，GP)。
具体地，时隙中包含的每个符号的传输状态为以下的任意一种：
上行传输(uplink，UL)状态、下行传输(downlink，DL)状态和不确定(unknown)状态3种状态，可记为UL/DL/X(或，简记为U/D/X)。其中，X称为unknown状态或灵活(flexible)状态，终端设备在X状态对应的符号上既不收也不发信息。X也可以称之为F或U。
例如，时隙格式_0指的是一个时隙包含的14个符号的传输状态均为下行传输状态；时隙格式_1指的是一个时隙包含的14个符号的传输状态均为上行传输状态；时隙格式_2指的是一个时隙包含的14个符号的传输状态均为不上行也不上行传输状态等。在5G NR中时隙格式最多可能有256种，这里不一一列举。
进一步地，不同的时隙格式包括的上行传输符号个数、下行传输符号个数或-灵活符号个数不一样。
三、配置时隙格式。
5G NR中支持半静态或动态的时隙格式配置。
1、半静态配置时隙格式。
具体地，网络设备向终端设备发送半静态的信令，该半静态的信令用于时隙格式配置。 例如，通过RRC信令通知一段时间上的或者以某个时间段为周期的终端设备各个时隙包括的符号的传输状态。其中，半静态的信令可以为小区专属(cell-specific)的，也就是小区中的所有终端设备都接收这个半静态的信令实现时隙格式配置；或者，半静态的信令也可以为某个(些)终端设备的专属信令(dedicated signaling)，也就是说该某个(些)终端设备接收该半静态的信令实现时隙格式配置。
2、动态配置时隙格式。
5G NR中也支持通过DCI信令通知终端设备在一段时间上的或者以某个时间段为周期的某一个或几个时隙上的时隙格式。该DCI信令中包括时隙格式指示(slot format indicator，SFI)信息，因此称为动态SFI信令。
具体地，该SFI信息通过DCI2_0信息下发。DCI2_0信息可以覆盖上述半静态配置时隙格式中，符号的传输状态为unknown的状态。该DCI2_0为协议规定的用于承载SFI信息的一种下行控制信息格式。
此外，5G NR中还预定义多个时隙的多种符号状态组合，该组合所在的表称之为终端设备特定表(specific table)。具体地，网络设备通过RRC信令配置一个或多个时隙上的时隙格式组合(slot format combination)，其中可以使用组合的序号标识(entry identify，entry ID)来指示具体的时隙格式。并且DCI信令可以动态指示上述一个或多个时隙上的时隙格式组合。该特定表specific table中最大数目的entry数(max Nrof Slot Format Combinations Per Set)为512，每一条entry最大slot个数(max Nrof Slot Formats Per Combination)为256。
下面结合表2简单介绍上述的特定表specific table。表2是终端设备特定表specific table。
表2
entry ID slot1 slot2 slot3 … slotm … slotn … slot256
1 s1 s2 s3 … sm        
2 s1 s2 s3 … sm … sn    
…                  
122 s1 s2 s3 … sm … sn … s256
…                  
512 s1 s2 s3 … sm        
表2中s指的是符号(symbol)，n、m为不同的符号的标识。
首先，网络设备通过RRC信令下发一个entry ID的配置信息以及entry ID对应的具体时隙格式表格，横轴为该组合中不同的slot，纵轴为entry ID。表2中包含的是每条entry可能的时隙格式组合。
继而，通过不同的DCI信令指示对应载波的对应配置为该表格中某条entry ID，DCI信令是承载在组共同物理下行控制信道(group common-physical downlink control channel，GC-PDCCH)信道上，DCI信令中携带的每个SFI信息为一个时隙格式组合对应的entry ID，DCI信令中总共可以承载16个SFI信息。其中，SFI信息可以理解为SFI的索引(index)。网络设备配置终端设备周期性地检测GC-PDCCH，接收携带SFI的DCI信令，该周期称为监测周期(monitor period)。
四、终端设备组。
在V2X系统中，进行侧行链路通信的多个终端设备，可以以一个组的形式进行组播(groupcast)通信，该多个终端设备组成的组可以称之为终端设备组。组播通信通常是终端设备组里的一个终端设备执行发送信息的动作，终端设备组里其他的终端设备接收该终端设备发送的信息。应理解，组播通信时，通常终端设备组里会有多个终端设备。例如，每个终端设备组里有大于2个终端设备。
如图3所示，图3是本申请实施例提供的一种终端设备组示意图。该示意图中包括多个终端设备。
示例性地，如图3(a)所示终端设备#A为终端设备组中执行发送信息的终端设备，终端设备#B～终端设备#E为终端设备组中执行接收信息的终端设备。
示例性地，该网络设备覆盖范围内的侧行链路通信系统中可以包括互相相关的多个终端设备组，如图3(b)所示，终端设备组#1和终端设备组#2为相关的两个终端设备组。其中，终端设备组#1中包括终端设备#A～终端设备#E，终端设备#A为终端设备组#1中执行发送信息的终端设备，终端设备#B～终端设备#E为终端设备组#1中执行接收信息的终端设备；终端设备组#2中包括终端设备#1～终端设备#5，终端设备#1为终端设备组#2中执行发送信息的终端设备，终端设备#2～终端设备#5为终端设备组#2中执行接收信息的终端设备。
具体地，多个终端设备组相关指的是多个终端设备组互相之间需要进行资源协调。
例如，网络设备针对相关的多个终端设备组需要进行时域资源和/或频域资源和/或码域资源的协调。
应理解，图3(b)只是一种示例，不能对本申请构成任何限定。例如，该网络设备覆盖范围内的侧行链路通信系统中包括的相关的终端设备组组数可以比图3(b)所示终端设备组组数多。
进一步地，该网络设备覆盖范围内的侧行链路通信系统中多个相关的终端设备组可以划分为一个区域，如图3(c)所示，终端设备组#1-终端设备组#3为该网络设备覆盖范围内的侧行链路通信系统中相关的三个终端设备组、终端设备组#4-终端设备组#6为该网络设备覆盖范围内的侧行链路通信系统中另外的相关的三个终端设备组。具体地，终端设备组#1-终端设备组#3划分为区域#1，终端设备组#4-终端设备组#6划分为区域#2。
该网络设备覆盖范围内的侧行链路通信系统中同一个区域中的终端设备组互相之间需要进行资源协调。而不同的区域之间的干扰较小，可以理解为不同的区域之间具有一定的隔离度。其中，可选地网络设备可以基于终端设备的上报的参考信号接收功率(reference signal received power，RSRP)/参考信号接收质量(reference signal received quality，RSRQ)等信号的信号强度判断终端设备之间是否存在干扰，进而在具有强干扰的终端设备组之间协调资源分配。
应理解，图3(c)只是一种示例，不能对本申请构成任何限定。例如，该网络设备覆盖范围内的侧行链路通信系统中的区域个数可以比图3(c)所示区域个数多。
上面简单介绍了本申请中涉及的时隙格式、5G NR系统中网络设备配置时隙格式的方法以及终端设备组的概念。在介绍本申请具体方案之前，提供一种针对侧行链路通信的时隙格式配置方法，该时隙格式配置方法是在上述的5G NR系统指示SFI的基础上，进一 步确定时隙中能够用于侧行链路通信的符号。下面结合图4和图5简单介绍该针对侧行链路通信的时隙格式指示方法。
图4是一种侧行链路通信的时隙格式示意图。该示意图包括第一行中所示的时隙格式以及第二行中所示的时隙格式。
如图4所示，图4中的第一行所示的为前文所述的5G NR中通用的SFI配置的时隙格式，其中，D标识该符号的传输状态为下行传输状态、U标识该符号的传输状态为上行传输状态以及X标识该符号的状态为不确定状态，其中，如前文所述X符号也可以称之为flexible(F)符号或unknown(U)符号，表示X符号中的传输方向可变，或传输方向可配置。
图4中的第二行所示的为在5G NR中通用的SFI的时隙格式配置基础上，将时隙中符号的传输状态为X或U的符号，进一步标识该符号的传输状态为侧行链路通信(sidelink，S)符号。
当时隙格式配置为图4中第二行所示的侧行链路通信时隙格式时，侧行链路通信时隙格式指示(sidelink SFI，SL-SFI)，可以进一步指示S_initial以及S_end，其中，S_initial指的是S符号的起始位置、S_end指的是S符号的结束位置，使得在S_initial以及S_end之间的X或U符号被覆盖为S符号，用作sidelink通信。
也就是说5G NR中SFI可以分别指示一个时隙中包含的多个符号的D/X/U传输状态，图4中的SL-SFI可以指示时隙中包含的符号S。根据网络设备的资源调度或终端设备的自动资源选择，上述符号S也可以被看作是用于收发之间转换的X符号。
进一步，如图5所示，S还可以被标识为sidelink上的SL发射(transmit，Tx)或SL接收(receive，Rx)状态。
图5是另一种侧行链路通信的时隙格式示意图。该示意图包括第一行中所示的时隙格式、第二行中所示的发射和接收时隙格式。
其中，图5中的第一行所示的时隙格式为图4中所示的第二行的时隙格式，即，中间12个符号用于SL。
图5中的第二行所示的时隙格式，其中，R标识接收、T标识发射以及X标识接收-发射转换。即，图4和图5所示的时隙格式的方法，可以指示侧行链路通信的终端设备的时隙格式。但是，该方法中并未涉及针对侧行链路通信系统终端设备组中的终端设备如何配置时隙格式，仅仅是在5G NR配置时隙格式的基础上，进一步配置时隙中可以用于SL的符号。
具体地，在V2X系统中，当侧行链路上进行groupcast通信时，可以是多个终端设备建立一个终端设备组，并且在该网络设备覆盖范围内的侧行链路通信系统中可以包括多个终端设备组。
例如，如图3(b)中所示的V2X系统中包括终端设备#A-终端设备#E，其中，终端设备#A-终端设备#E组成终端设备组#1，终端设备#A为终端设备组#1中的发送信息的终端设备，终端设备#B-终端设备#E为终端设备组#1中的接收信息的终端设备；终端设备#1-终端设备#5组成终端设备组#2，终端设备#1为终端设备组#2中的发送信息的终端设备，终端设备#2-终端设备#5为终端设备组#2中的接收信息的终端设备。
具体地，一个终端设备组中的多个终端设备根据执行发送信息和接收信息的不同终端 设备，可以分为发起方终端设备(initiating user equipment，I UE)和响应方终端设备(reception user equipment，R UE)。
应理解，一个终端设备组中只包括一个发起方终端设备，其他的终端设备均为响应方终端设备。其中，将终端设备组中的多个终端设备分别称为发起方终端设备和响应方终端设备只是为了简便，并不能限制本申请的保护范围。例如，发起方终端设备还可以称为发送方终端设备或主动方终端设备等；响应方终端设备还可以称为接收方终端设备或被动方终端设备等。
还应理解，本申请中的涉及的终端设备组并不限制一定是V2X系统中的终端设备组，其他侧行链路通信场景下的终端设备也包括上述的终端设备组的情况。这里不再赘述。
因此，V2X系统中会存在多个终端设备组。那么对于多个终端设备组分别包括的终端设备来说，需要为每个终端设备组中的终端设备发送SFI信息，为终端设备组中的每个终端设备配置时隙格式，使得每个终端设备组中的终端设备能够获知一个时隙包括的多个符号的传输状态，从而顺利地进行侧行链路通信。
下面结合图6-图12详细介绍本申请中提供的用于侧行链路通信的方法。该用于侧行链路通信的方法中网络设备能够指示终端设备组中的每个终端设备的时隙格式，使得终端设备组中的各个终端设备分别获知各自在哪些时域位置上进行传输，以及在哪些时域位置上进行接收，并且本申请实施例的用于侧行链路通信的方法进行时隙格式指示时所占用的信息资源少。
具体地，该用于侧行链路通信的方法能够应用于上述的V2V系统中，或者其他侧行链路通信的场景下。
图6是本申请实施例提供的一种用于侧行链路通信的方法示意图。下面详细介绍该方法。
S110，网络设备确定下行控制信息，该下行控制信息携带第一指示信息，其中，所述第一指示信息用于指示至少一个终端设备组对应的时隙格式。
网络设备根据该网络设备覆盖范围内的侧行链路通信系统中的终端设备组的总数，确定需要为系统中的哪些终端设备组中的终端设备配置时隙格式。
例如，该网络设备覆盖范围内的侧行链路通信系统中的终端设备组的总数为M组，网络设备确定需要通过下行控制信息为M个终端设备组中的N1个终端设备组中的终端设备配置时隙格式。其中，N1为正整数，M为大于或者等于N1的整数。
进一步地，网络设备根据需要配置时隙格式的N1个终端设备组，以及该N1个终端设备组中的终端设备，确定需要发送的下行控制信息的载荷情况。
具体地，下行控制信息中携带第一指示信息，第一指示信息用于指示N1个终端设备组对应的时隙格式。信息段一个终端设备组中包括多个进行侧行链路组播通信的终端设备。
应理解，一个终端设备组中中的多个进行侧行链路组播通信的终端设备中包括一个发起方终端设备用于发送信息；还包括除该发起方终端设备之外的多个响应方终端设备，用于接收该发起方终端设备发送的信息。
示例性地，若所述N1等于1，
第一指示信息用于指示N1个终端设备组对应的时隙格式，包括：
第一指示信息用于指示第一终端设备组中的N个终端设备对应的时隙格式，第一指示信息包括N个信息段，N个信息段中的一个信息段用于指示第一终端设备组中的一个终端设备对应的时隙格式，所述N为正整数。即，网络设备通过下行控制信息为第一终端设备组中的终端设备配置时隙格式，N个信息段与该一第一终端设备组中的N个终端设备一一对应，N个信息段分别用于确定N个终端设备的时隙格式。其中，N为小于或者等于第一终端设备组中的所有终端设备个数的正整数，即，网络设备通过下行控制信息可以为该第一终端设备组中的部分或者全部终端设备配置时隙格式。
应理解，第一终端设备组可以为该网络设备覆盖范围内的侧行链路通信系统中的任意一个终端设备组，“第一”仅用于区分说明，而不应对本申请构成任何限定。
示例性地，若所述N1大于1，第一指示信息用于指示N1个终端设备组对应的时隙格式，第一指示信息包括N1个信息段，N1个信息段中一个信息段用于指示N1个终端设备组中一个终端设备组对应的时隙格式。即，网络设备通过下行控制信息为N1个终端设备组配置时隙格式。N1个信息段与N1个终端设备组一一对应，N1个信息段分别用于确定N1个终端设备组的时隙格式。其中，N1个终端设备组互相之间需要进行资源协调，即N1个终端设备组为同一个区域中的终端设备组。
具体地，上述的N1个终端设备组互相之间需要进行资源协调包括：N1个终端设备组互相之间需要进行时域资源协调，和/或，N1个终端设备组互相之间需要进行频域资源协调，和/或，N1个终端设备组互相之间需要进行码域资源协调。
下面，结合图7详细说明N个信息段与N1个终端设备组相对应的几种情况，图7是本申请实施例提供的表示信息段与终端设备组相对应的示意图：
情况一：
N1等于1，网络设备通过第一指示信息为第一终端设备组中的终端设备配置时隙格式。该第一终端设备组由N个进行侧行链路组播通信的终端设备组成。第一指示信息包括N个信息段，N个信息段与该第一终端设备组中的N个终端设备一一对应。如图7(a)所示，下行控制信息中携带的第一指示信息包括N个信息段(如图7(a)所示的信息段#1～信息段#N)，每个信息段与终端设备组中的一个终端设备相对应(如图7(a)所示的信息段#1与终端设备#1相对应、信息段#2与终端设备#2相对应、…、信息段#N与终端设备#N相对应)，每个信息段用于确定该信息段对应的终端设备的时隙格式。其中，每个信息段能够确定该信息段对应的终端设备的时隙格式可以是每个信息段中包括该信息段对应的终端设备的时隙格式指示信息，或者，每个信息段与该信息段对应的终端设备的时隙格式指示信息相对应。
具体地，在情况一所示的情况下，若网络设备需要为该网络设备覆盖范围内的侧行链路通信系统中的M个终端设备组中的终端设备配置时隙格式，则网络设备需要通过M个下行控制信息分别携带M个第一指示信息。每个第一指示信息中包括N个信息段分别对应M个终端设备组中一个终端设备组包括的N个终端设备(如图7(b)所示的M个第一指示信息中每个第一指示信息均包括信息段#1～信息段#N)，每个信息段用于确定该信息段对应的终端设备组中的终端设备的时隙格式。
应理解，情况一所示的信息段与终端设备组相对应时，一个第一指示信息能够直接指示一个终端设备组中的全部的终端设备对应的时隙格式，从而当网络设备覆盖范围内的侧 行链路通信系统中包括M个终端设备组时，网络设备下发M个第一消息并在每个第一消息中携带第一指示信息即可。
情况二：
N1等于1，网络设备通过第一指示信息为第一终端设备组中的终端设备配置时隙格式。且该第一终端设备组由N2个进行侧行链路组播通信的终端设备组成。第一指示信息包括N个信息段，N个信息段与该第一终端设备组中的N个终端设备一一对应，N为小于N2的正整数。如图7(c)所示，下行控制信息中携带的第一指示信息包括N个信息段(如图7(c)所示的信息段#1～信息段#N)，每个信息段与终端设备组中的一个终端设备相对应(如图7(c)所示的信息段#1与终端设备#1相对应、信息段#2与终端设备#2相对应、…、信息段#N与终端设备#N相对应)，每个信息段用于确定该信息段对应的终端设备的时隙格式。
具体地，在情况二所示的情况下，假设N2＝2N，则网络设备为该第一终端设备组中包括的N2个终端设备配置时隙格式，需要通过2个下行控制信息(下行控制信息#1和下行控制信息#2)。其中，下行控制信息#1携带的第一指示信息包括的N个信息段分别与该终端设备组中的终端设备#1-终端设备#N相对应，下行控制信息#2携带的第一指示信息包括的N个信息段分别与该终端设备组中的终端设备#N+1-终端设备#N2相对应。
进一步地，若网络设备为该网络设备覆盖范围内的侧行链路通信系统中的M个终端设备组中的终端设备配置时隙格式，则网络设备需要通过2M个下行控制信息分别携带2M个第一指示信息。每个第一指示信息中包括N个信息段分别对应M个终端设备组中一个终端设备组中的N个终端设备(如图7(d)所示的2M个第一指示信息中每个第一指示信息均包括信息段#1～信息段#N)，每个信息段用于确定该信息段对应的终端设备组中的终端设备的时隙格式。
应理解，图7中(c)和(d)只是一种举例的形式，具体地N2还可以等于3N或者其他值，当一个下行控制信息的尺寸不足时，需要通过多个下行控制信息通知一个终端设备组中的终端设备的时隙格式，这里不再一一举例说明。
应理解，情况二所示的信息段与终端设备组相对应时，一个第一指示信息能够直接指示一个终端设备组中的部分的终端设备对应的时隙格式，从而当网络设备覆盖范围内的侧行链路通信系统中包括M个终端设备组时，网络设备需要下发M1个第一消息并在每个第一消息中携带第一指示信息，M1为大于M的整数。则，在情况二下，相比于情况一需要下发的第一消息多，网络设备的资源开销较大。
情况三：
N1大于1，网络设备通过第一指示信息为N1个终端设备组备配置时隙格式。则如图7(e)所示，下行控制信息中携带的第一指示信息包括N1个信息段(如图7(e)所示的信息段#1～信息段#N1)，每个信息段与一个终端设备组相对应(如图7(e)所示的信息段#1与终端设备组#1相对应、信息段#2与终端设备组#2相对应、…、信息段#N1与终端设备组#N1相对应)，每个信息段用于确定该信息段对应的终端设备组对应的时隙格式。
N1个信息段与所述N1个终端设备组一一对应，其中，N1个终端设备组互相之间需要进行资源协调。如图3中(c)所示的该网络设备覆盖范围内的侧行链路通信系统中的多个相关的终端设备组可以划分为一个区域。可以理解为第一指示信息指示一个区域包括 的终端设备组中的终端设备的时隙格式。
应理解，当N1个信息段与所述N1个终端设备组一一对应时，N1个信息段中的第二信息段指示与之对应的第二终端设备组中的终端设备在哪些资源上进行传输，但是并不具体指示第二终端设备组中的终端设备的时隙格式。可以理解为，网络设备通过第二信息段指示第二终端设备组中的发起方终端设备对应的时隙格式，而网络设备并未指定该第二终端设备组中包括的多个终端设备中哪一个终端设备为发起方终端设备。
例如，对于第二终端设备组，与之对应的第二信息段指示该第二终端设备组中的终端设备的传输资源为TTTXXXTTXXXXXX；对于第三终端设备组，与之对应的第三信息段指示该第三终端设备组中的终端设备的传输资源为XXXTTTXXXXXXTT；对于第四终端设备组，与之对应的第四信息段指示该第四终端设备组中的终端设备的传输资源为XXXXXXXTTTTTXX。并且当通知一个区域内的多个终端设备组的传输资源时，网络设备会对各个终端设备组之间进行一定的资源协调分配。在上述的第二终端设备组、第三终端设备组和第四终端设备组之间的传输资源在时间资源上进行了完全正交的协调，从而避免相互之间的干扰。但是本申请对此并不限制，还例如第二终端设备组、第三终端设备组和第四终端设备组之间的传输资源在时间资源上可以是不完全正交的协调。
应理解，情况三所示的信息段与终端设备组相对应时，一个第一指示信息能够直接指示多个终端设备组对应的时隙格式，从而当网络设备覆盖范围内的侧行链路通信系统中包括N1个终端设备组时，网络设备需要下发一个第一消息并在第一消息中携带第一指示信息。则，在情况三下，相比于情况一以及情况二来说需要下发的第一消息少，网络设备的资源开销较小。
可选地，当一个终端设备组中的终端设备获知其自身所属的终端设备组对应的时隙格式时，还可以获知与自身强干扰的同一个区域中的其他终端设备组的传输资源，从而在决定自身一个时隙内包括的符号的传输状态时，能够考虑周围终端设备组的影响。
具体地地，下行控制信息为前文所述的DCI，第一指示信息为用于指示时隙格式的信息，该DCI用于携带时隙格式指示信息。
例如，针对上述情况一DCI包括如下信息：
1)DCI格式标识，该DCI格式标识可以占用一个或多个比特；
2)终端设备组#1中的终端设备#1的SFI信息，终端设备组#1中的终端设备#2的SFI信息，…，终端设备组#1中的终端设备#N的SFI信息。
例如，针对上述情况二DCI包括如下信息：
1)DCI格式标识，该DCI格式标识可以占用一个或多个比特；
2)起始终端设备的标识；
3)终端设备组#1中的终端设备#1的SFI信息，终端设备组#1中的终端设备#2的SFI信息，…，终端设备组#1中的终端设备#N的SFI信息。
上述DCI包括的信息中起始终端设备的标识为当DCI尺寸不够时，需要增加的项，下面将结合具体场景进行详细介绍，这里不再赘述。
还例如，针对上述情况三DCI包括如下信息：
1)DCI格式标识，该DCI格式标识可以占用一个或多个比特；
2)终端设备组#1的SFI信息，终端设备组#2的SFI信息，…，终端设备组#N1的SFI 信息。
其中，终端设备组#1的SFI信息指的是终端设备组#1中的所有终端设备的传输资源指示信息。
示例性地，第一指示信息为N1个终端设备组中的终端设备的时隙格式指示信息，而终端设备组中的终端设备之间进行侧行链路通信，则可以称第一指示信息为侧行链路通信时隙格式指示(sidelink slot format indicator，SL-SFI)信息。
示例性地，对应于上述的情况一和情况二，N个信息段与N个终端设备相对应，可以是N个信息段与N个终端设备的标识一一对应。进而为了使得N个信息段与N个终端设备的标识一一对应，网络设备需要确定N个信息段与N个终端设备的标识之间的一一对应关系，并向N个终端设备发送第二消息，第二消息包括N个信息段与N个终端设备的标识之间的一一对应关系。其中，第二消息可以是半静态信令，或者，其他用于发送N个信息段与N个终端设备之间的一一对应关系的消息。
例如，第二消息可以是RRC信令、MAC信令或物理层信令；或者，第二消息可以是网络设备确定的任意一个用于携带N个信息段与N个终端设备之间的一一对应关系的消息。
或者，N个信息段与N个终端设备的标识之间的一一对应关系通过预先配置在网络设备和/或N个终端设备中。
全文所述信息段与终端设备的标识之间的一一对应关系，也可以称之为包含SFI信息的信息在下行控制信息中所在的位置与终端设备的标识之间的一一对应关系。
即，终端设备根据终端设备的标识能够确定该终端设备对应的信息段。
具体地，终端设备根据终端设备的标识能够确定该终端设备对应的信息段包括以下几种方式：
方式一：
在第一指示信息中的每个信息段中包括一个终端设备的标识，指示每个信息段中包括的是该终端设备的标识所指示的终端设备的SFI信息。
如图8所示，图8是本申请实施例提供的一种信息段与终端设备实现一一对应的示意图。该示意图包括信息段#1～信息段#N，每个信息段中包括终端设备的标识(如图8所示的终端设备#1～终端设备#N)和终端设备对应的SFI信息(图8所示的SFI#1～SFI#N)。即，可以指示每个信息段中包括的是哪个终端设备的SFI信息。
具体地，还可以是，如图9所示，图9是本申请实施例提供的另一种信息段与终端设备实现一一对应的示意图。该示意图包括信息段#1～信息段#N，每个信息段中包括终端设备组中的终端设备对应的SFI信息(图9所示的SFI#1～SFI#N)；信息段#N+1～信息段#2N，每个信息段中包括信息段#1～信息段#N对应的终端设备的标识(图9所示的终端设备#1～终端设备#N)。即，可以建立终端设备的标识与包括终端设备的SFI信息的信息段之间的对应关系。
可选地，图9中信息段#1～信息段#N与信息段#N+1～信息段#2N的顺序可以调换。图9中信息段#1～信息段#N也可以称之为一个信息段下的sub信息段#1～sub信息段#N；信息段#N+1～信息段#2N也可以称之为一个信息段下的sub信息段#N+1～sub信息段#2N。
方式二：
预设第一指示信息中每个信息段对应的终端设备的标识的顺序，只需在每个信息段中包括终端设备对应的SFI，无需如图8和图9中所示的携带终端设备的标识。
例如，预设从终端设备的标识为1开始升序排序，终端设备根据自身的标识，获取与自身的标识对应的信息段。终端设备#1是标识为1的终端设备，即，终端设备#1获取信息段#1，从信息段#1中获取自身的SFI信息。其中，终端设备的标识1可以无需携带在下行控制信息中，预设的升序顺序可以通过半静态信令通知N个终端设备，或者，预先配置在网络设备和/或N个终端设备中。
还例如，预设从终端设备的标识为N开始降序排序，终端设备根据自身的标识，对应获取信息段。终端设备#1是标识为1的终端设备，即，终端设备#1获取信息段#N，从信息段#N中获取自身的SFI信息。其中，终端设备的标识N可以无需携带在下行控制信息中，预设的降序顺序可以通过半静态信令通知N个终端设备，或者，预先配置在网络设备和/或N个终端设备中。
还例如，预设从终端设备的标识为P开始升序排序，终端设备根据自身的标识，对应获取信息段。终端设备#1是标识为1的终端设备，即，终端设备#1获取信息段#1，从信息段#1中获取自身的SFI信息。其中，终端设备的标识P以及升序排序可以通过半静态信令通知N个终端设备，或者，预先配置在网络设备和/或N个终端设备中。
还例如，预设从终端设备的标识为P开始降序排序，终端设备根据自身的标识，对应获取信息段。终端设备#1是标识为1的终端设备，即，终端设备#1获取信息段#P，从信息段#P中获取自身的SFI信息。其中，终端设备的标识P以及降序排序可以通过半静态信令通知N个终端设备，或者，预先配置在网络设备和/或N个终端设备中。
还例如，第一指示信息中每个信息段对应的终端设备的标识的顺序可以按照某种预定义的次序，或者按照非连续升序，或者按照非连续降序等，这些都可以作为示例，不再一一列举。
方式三：
网络设备确定N个终端设备的标识与N个信息段之间的一一对应关系，并将该一一对应关系通过第二消息告知N个终端设备，其中，第二消息可以为半静态信令。或者，N个终端设备的标识与N个信息段之间的一一对应关系预先配置在网络设备和/或N个终端设备中。则，终端设备能够根据自身的标识与信息段之间的一一对应关系，获取与终端设备的标识对应的信息段。
应理解，前文所述的终端设备的标识，为终端设备在所属的终端设备组中的相对标识。例如，一个终端设备组中包括16个终端设备，编号从1-16分别对16个终端设备进行标识。
示例性地，针对上述情况三，N1个信息段与N1个终端设备组相对应，可以是N1个信息段与N1个终端设备组的标识一一对应。进而为了使得N1个信息段与N1个终端设备组的标识一一对应，需要建立N1个信息段与N1个终端设备组的标识之间的一一对应关系。即，根据终端设备组的标识能够确定终端设备组对应的信息段。
具体地，根据终端设备组的标识能够确定终端设备组对应的信息段包括以下几种方式：
方式一：
在第一指示信息中的每个信息段中包括一个终端设备组的标识，指示每个信息段中包括的是该终端设备组的标识所指示的终端设备组的SFI信息。
如图10所示，图10是本申请实施例提供的一种信息段与终端设备组实现一一对应的示意图。该示意图包括信息段#1～信息段#N1，每个信息段中包括对应的终端设备组的标识(如图10所示的终端设备组#1～终端设备组#N1)和终端设备组对应的SFI信息(图10所示的SFI#1～SFI#N1)。即，可以指示每个信息段中包括的是哪个终端设备组的SFI信息。
具体地，还可以是，如图11所示，图11是本申请实施例提供的另一种信息段与终端设备组实现一一对应的示意图。该示意图包括信息段#1～信息段#N1，每个信息段中包括终端设备组对应的SFI信息(图11所示的SFI#1～SFI#N1)；信息段#N1+1～信息段#2N1，每个信息段中包括信息段#1～信息段#N1对应的终端设备组的标识。即，可以建立终端设备组的标识与包括终端设备组的SFI信息的信息段之间的对应关系。
可选地，图11中信息段#1～信息段#N1与信息段#N1+1～信息段#2N1的顺序可以调换。图11中信息段#1～信息段#N1也可以称之为一个信息段下的sub信息段#1～sub信息段#N1；信息段#N1+1～信息段#2N1也可以称之为一个信息段下的sub信息段#N1+1～sub信息段#2N1。
方式二：
预设第一指示信息中每个信息段对应的终端设备组的标识的顺序，只需在每个信息段中包括终端设备组对应的SFI，无需如图10和图11中所示的携带终端设备组的标识。
例如，预设从终端设备组的标识为1开始升序排序，终端设备组中的终端设备根据所属的终端设备组的标识，对应获取信息段。终端设备组#1是标识为1的终端设备组，即，终端设备组#1中的终端设备获取信息段#1，首先从信息段#1中获取终端设备组#1的SFI信息，再根据基于自动检测结果或是资源分配确定自身的SFI。其中，终端设备组的标识1可以无需携带在下行控制信息中，预设的升序顺序可以通过半静态信令通知N1个终端设备组中的终端设备，或者，预先配置在网络设备和/或N1个终端设备组中的终端设备中。
还例如，预设从终端设备组的标识为N1开始降序排序，终端设备组中的终端设备根据所属的终端设备组的标识，对应获取信息段。终端设备组#1是标识为1的终端设备组，即，终端设备组#1中的终端设备获取信息段#N1，首先从信息段#N1中获取终端设备组#1的SFI信息，再根据基于自动检测结果或是资源分配确定自身的SFI。其中，终端设备组的标识N1可以无需携带在下行控制信息中，预设的降序顺序可以通过半静态信令通知N1个终端设备组中的终端设备，或者，预先配置在网络设备和/或N1个终端设备组中的终端设备中。
还例如，预设从终端设备组的标识为P开始升序排序，终端设备组中的终端设备根据所属的终端设备组的标识，对应获取信息段。终端设备组#1是标识为1的终端设备组，即，终端设备组#1中的终端设备获取信息段#1，首先从信息段#1中获取终端设备组#1的SFI信息，再根据基于自动检测结果或是资源分配确定自身的SFI。其中，终端设备组的标识P以及升序排序可以通过半静态信令通知N1个终端设备组中的终端设备，或者，预先配置在网络设备和/或N1个终端设备组中的终端设备中。
还例如，预设从终端设备组的标识为P开始降序排序，终端设备组中的终端设备根据 所属的终端设备组的标识，对应获取信息段。终端设备组#1是标识为1的终端设备组，即，终端设备组#1中的终端设备获取信息段#P，首先从信息段#P中获取终端设备组#1的SFI信息，再根据基于自动检测结果或是资源分配确定自身的SFI。其中，终端设备组的标识P以及降序排序可以通过半静态信令通知N1个终端设备组中的终端设备，或者，预先配置在网络设备和/或N1个终端设备组中的终端设备中。
还例如，第一指示信息中每个信息段对应的终端设备组的标识的顺序可以按照某种预定义的次序，或者按照非连续升序，或者按照非连续降序等，这些都可以作为示例，不再一一列举。
方式三：
网络设备确定N1个终端设备组的标识与N1个信息段之间的一一对应关系，并将该一一对应关系通过第三消息告知N1个终端设备组中的终端设备，其中，第三消息可以为半静态信令。或者，N1个终端设备组的标识与N1个信息段之间的一一对应关系预先配置在网络设备和/或N1个终端设备组中的终端设备中。则，终端设备能够根据自身所属的终端设备组的标识与信息段之间的一一对应关系，获取与终端设备组的标识对应的信息段，并进一步获取自身的SFI信息。
在网络设备确定下行控制信息之后，向需要配置时隙格式的终端设备组发送下行控制信息，执行S120。
在本申请实施例中，网络设备可以和至少一个终端设备组中的终端设备进行信令交互，以便于配置时隙格式。以下，不失一般性，以网络设备与第一终端设备组中的终端设备信令交互为例，详细说明本申请实施例提供的用于侧行链路通信的方法。
应理解，第一终端设备组可以为该至少一个终端设备组中的任意一个终端设备组，“第一”仅用于区分说明，而不应对本申请构成任何限定。
S120，网络设备向第一终端设备组发送下行控制信息。
示例性地，针对上述情况一和情况二，网络设备向第一终端设备组中的终端设备发送下行控制信息，其中，下行控制信息中携带第一指示信息，第一指示信息包括N个信息段，N个信息段与第一终端设备组中的N个终端设备一一对应，N个信息段中分别包括N个终端设备对应的时隙格式指示SFI信息。其中，第一终端设备组为需要配置时隙格式的多个终端设备组中的任意一个终端设备组。
示例性地，针对上述情况三，网络设备向N1个终端设备组中的第一终端设备组的终端设备发送下行控制信息，其中，下行控制信息中携带第一指示信息，第一指示信息包括N1个信息段，N1个信息段与所述N1个终端设备组一一对应，N1个信息段中分别包括N1个终端设备组对应的时隙格式指示SFI信息。
示例性地，每个信息段中包括的SFI信息可以是预先通过RRC信令配置的一个用于确定SFI的表格，该表格中包含SFI索引与符号的实际传输状态(发送状态、接收状态或未知状态)之间的对应关系。因此，信息段中包括的SFI信息是各个SFI索引。其中，所述用于确定SFI的表格是为侧行链路配置的终端设备特定的时隙格式组合表格。
示例性地，每个信息段中包含的SFI信息还可以是一个预设长度的位图。其中，上述预设长度可以是网络设备通过RRC信令通知给终端设备组中的终端设备；或者，预设长度还可以是预先设置在网络设备和终端设备中。上述预设长度的位图表示从第一时刻开 始，一定时间范围内区分符号的实际传输状态(发送状态、接收状态或未知状态)的指示。因此，信息段中包括的SFI信息是各个SFI位图。
示例性地，网络设备在发送下行控制信息之前，对下行控制信息进行加扰。具体地，网络设备定义一个第一标识符，下行控制信息通过该第一标识符加扰。
示例性地，针对上述的情况一和情况二，该第一标识符为网络设备预先定义的。网络设备通过半静态信令通知给上述的终端设备组中的N个终端设备，使得N个终端设备均能够提前获知该第一标识符。或者，该第一标识符是预先配置的，预先配置指的是预先设置在网络设备和/或N个终端设备中。
可选地，在上述情况一和情况二下，网络设备针对不同的终端设备组发送的不同的下行控制信息通过不同的第一标识符加扰。
例如，每个携带第一指示信息的下行控制信息可以通过该第一指示信息中包括的信息段对应的终端设备所属的终端设备组所相应的终端设备组无线网络临时标识符(radio network temporary identifier，RNTI)进行加扰，其中，终端设备组RNTI也可以称之为group-RNTI。
可选地，在上述情况一和情况二下，网络设备针对不同的终端设备组发送的不同的下行控制信息可以通过同一个第一标识符进行加扰。
例如，网络设备对于多个终端设备组定义共同的第一标识符。进一步地，通过位置偏移或时间偏移对多个终端设备组之间进行区分。这样可以减少需要的加扰第一标识符的个数。其中，所述位置偏移指在第一搜索空间上的控制信息发送频域位置上的偏移；所述时间偏移指在第一搜索空间上的控制信息发送时间上的偏移。
下面举例说明多个下行控制信息通过同一个第一标识符进行加扰的方案：
该网络设备覆盖范围内的侧行链路通信系统中共有30个终端设备组需要配置时隙格式，网络设备向每个终端设备组中的终端设备分别下发下行控制信息，即网络设备针对终端设备组#1-终端设备组#30分别下发下行控制信息#1-下行控制信息#30。其中，下行控制信息#1-下行控制信息#5通过第一标识符#1进行加扰，下行控制信息#6-下行控制信息#10通过第一标识符#1进行加扰，…下行控制信息#26-下行控制信息#30通过第一标识符#6进行加扰。这样对于30个终端设备组下发的30个不同的下行控制信息来说，需要的用于加扰下行控制信息的第一标识符的个数从30个减少为6个。
进一步，下行控制信息#1-下行控制信息#5通过第一标识符#1进行加扰时，可以通过位置偏移或时间偏移对终端设备组#1-终端设备组#5之间进行区分。
例如，基于某参考频域资源，对下行控制信息#1，位置偏移为0；对下行控制信息#2，位置偏移为1；…对下行控制信息#5，位置偏移为4。因此基于上述不同的位置偏移上检测出的包含第一指示信息的下行控制信息，终端设备可以获知这是哪个组对应的第一指示信息，从而在减少所需第一标识符的个数的同时正确配置多个终端设备组中的终端设备的时隙格式。
还例如，基于某参考时域资源，对下行控制信息#1，时域偏移为0；对下行控制信息#2，时域偏移为1；…对下行控制信息#5，时域偏移为4。因此基于上述不同的时域偏移上检测出的包含第一指示信息的下行控制信息，终端设备可以获知这是哪个组对应的第一指示信息，从而在减少所需第一标识符的个数的同时正确配置多个终端设备组中的终端设 备的时隙格式。
当然，也可以结合位置偏移和时间偏移联合进行下行控制信息的指示。方法类似，不再详细列举。
示例性地，针对上述的情况三，该第一标识符为网络设备预先定义的。网络设备通过半静态信令通知给上述的N1个终端设备组中的终端设备，使得N1个终端设备组中的终端设备均能够提前获知该第一标识符。或者，该第一标识符是预先配置的，预先配置指的是预先设置在网络设备和/或N1个终端设备组中的终端设备中。
例如，网络设备配置一个区域中的N1终端设备组包括的终端设备的时隙格式，可以针对该区域定义一个区域RNTI，其中，区域RNTI也可以称之为zone-RNTI。携带第一指示信息的下行控制信息可以通过预定义的区域RNTI进行加扰。
应理解，本申请所述的加扰下行控制信息指的是对下行控制信息中循环冗余码校验(cyclic redundancy check，CRC)部分进行加扰。
进一步地，为了简化终端设备对于SFI信息的搜索，网络设备定义一个SL的第一搜索空间，并向N1个终端设备组中的终端设备发送第三指示信息，所述第三指示信息用于指示所述第一搜索空间。其中，第三指示信息可以为半静态信令。还可以配置控制资源集(control resource set，CORSET)用于SL特定的SFI的检测，例如，向N1个终端设备组中的终端设备发送第四指示信息，所述第四指示信息用于指示所述CORSET。还可以配置一个CORSET中或不同CORSET中的控制信道元素(control channel element，CCE)用于不同的终端设备组的SFI的检测。
示例性地，针对上述的情况二，由于下行控制信息的载荷限制，终端设备组包括的所有的终端设备的SFI信息无法均承载下行控制信息中，则该下行控制信息中还包括第二指示信息，所述第二指示信息用于标识所述N个终端设备。即，下行控制信息中包括能够确定是为终端设备组中的哪些终端设备配置时隙格式的第二指示信息。
可选地，第二指示信息可以是如图8和图9所示的包括所述N个终端设备中每个终端设备的标识。
可选地，第二指示信息可以是通过位置偏移或时间偏移对能够指示的终端设备的标识进行指示。
例如，当终端设备组中有30个终端设备(终端设备#1～终端设备#30)，一个下行控制信息可以最多携带16个终端设备的时隙格式指示信息，那么可以在位置偏移为1检测该30个终端设备中的第一部分，即1-16个终端设备对应的时隙格式指示信息，并在位置偏移为2检测该30个终端设备中的第二部分，即17-30个终端设备对应的时隙格式指示信息。
类似的，也可以定义检测时域偏移不同使得该30个终端设备的第一部分和第二部分被分别检测。例如，在时域偏移为1检测该30个终端设备中的第一部分，即1-16个终端设备对应的时隙格式指示信息，并在时域偏移为2检测该30个终端设备中的第二部分，即17-30个终端设备对应的时隙格式指示信息。
同样，还有更多结合检测位置偏移和时域偏移一起进行更多的不同部分的时隙格式指示信息的获取。方法类似，不再详细列举。
示例性地，第二指示信息包括N个终端设备中起始终端设备的标识。即，第二指示信 息为在下行控制信息中增加一个额外的域指示该N个终端设备。
其中，该域用来表示下行控制信息能够指示的N个终端设备中起始终端设备的标识，即，下行控制信息中携带的第一指示信息能够指示从该域所指示的终端设备的索引开始的一系列终端设备或一个范围内的终端设备的时隙格式。
应理解，对于一个终端设备组来说，其中包括的多个终端设备的标识，以及不同终端设备的标识大小的排序，网络设备和终端设备均已知。则，可以仅仅指示N个终端设备中起始终端设备的标识，按照已知的顺序，根据起始终端设备的标识确定该N个终端设备。
如图12所示，图12是本申请提供的一种第二指示信息的格式示意图。该示意图包括第一行和第二行，其中第一行为下行控制信息，第二行为下行控制信息中携带的第一指示信息包括的信息段对应的终端设备组中的终端设备。具体地，在下行控制信息中增加一个比特X，表示该下行控制信息中所包括的第一指示信息是从标识为X的第X个终端设备开始配置时隙格式的。
例如，X＝9时，表示该下行控制信息中所包括的第一指示信息是从第9个终端设备开始配置时隙格式的，所以第一指示信息中的第一个信息段包括的是第9个终端设备的SFI信息，第二个信息段包括的是第10个终端设备的SFI信息，以此类推。
同理，针对上述的情况三，由于下行控制信息的载荷限制，该网络设备覆盖范围内的侧行链路通信系统中的所有终端设备组对应的时隙格式信息无法均承载一个下行控制信息中，则该下行控制信息中还包括第四指示信息，所述第四指示信息用于标识所述N1个终端设备组。即，下行控制信息中包括能够确定是为哪些终端设备组配置时隙格式的第四指示信息。
具体地，第四指示信息与上述的第二指示信息类似，这里不再赘述。
S130，终端设备获取SFI信息。
示例性地，针对情况一和情况二，网络设备向第一终端设备组中的终端设备均发送下行控制信息，并通过第一标识符加扰下行控制信息。以终端设备组中的第一终端设备获取对应的SFI信息为例进行说明。
其中，第一终端设备为终端设备组中的N个终端设备中的任意一个终端设备。
应理解，“第一”、“第二”只是为了区分不同的终端设备，不对本申请构成任何限定。
例如，下行控制信息携带的第一指示信息中包括的第一信息段中包括第一终端设备的SFI信息，该第一终端设备根据第一终端设备的标识与第一信息段之间的一一对应关系，获取第一终端设备对应的第一信息段，进一步获取第一信息段中包括的SFI信息。
应理解，不同的信息段中包括的SFI信息可以指示的是不同的时隙格式。
示例性地，针对情况三，网络设备向N1个终端设备组中的终端设备均发送下行控制信息，并通过第一标识符加扰下行控制信息。以N1个终端设备组中的第一终端设备组获取对应的SFI信息为例进行说明。
例如，下行控制信息携带的第一指示信息中包括的第一信息段中包括第一终端设备组的SFI信息，该第一终端设备组根据第一终端设备组的标识与第一信息段之间的一一对应关系，获取第一终端设备组对应的第一信息段，进一步获取第一信息段中包括的SFI信息。其中，第一终端设备组的SFI信息指示第一终端设备组中的发送信息的终端设备对应的时隙格式，可以理解为第一终端设备组的SFI信息指示了第一终端设备组中发送信息的终端 设备的时隙格式，但是并未指定第一终端设备组中的哪一个终端设备为发送信息的终端设备。
进一步地，第一终端设备组中的终端设备获取第一信息段之后，第一终端设备组中的终端设备启动自动检测的传输方式在第一终端设备组的SFI信息指示的时隙格式上检测能够传输的资源，根据检测结果确定各自的时隙格式，即第一终端设备组中的不同的终端设备为平等竞争关系，争取在SFI信息指示的时隙格式上进行传输；
或者，第一终端设备组中设置有主终端设备，该主终端设备根据获取到的第一信息段中包括的SFI信息指示的时隙格式，进行资源分配，将资源分配给第一终端设备组中不同的终端设备，其中，主终端设备可以称之为第一终端设备组中的组头(group leader)。
示例性地，第一终端设备组在获取第一信息段中的SFI信息时，还可以获取同一个区域中其他终端设备组的SFI信息，即第一终端设备组能够获取下行控制信息中携带的第一指示信息包括的信息段对应的终端设备组的SFI信息。也就是说当第一终端设备组获知其自身的SFI信息时，也能够获知与第一终端设备组强干扰的终端设备组的SFI信息，从而在决定第一终端设备组组内不同终端设备的传输状态时，能够考虑强干扰的终端设备组的影响。
前文所述的一一对应关系也可以称之为匹配关系(matching relationship)，相关关系(association)等。具体地，前文中所涉及的半静态信令或预设配置的配置信息可以是通过RRC信令、媒体访问控制(media access control，MAC)信令或物理层信令中的至少一种。
上面结合图6-图12详细介绍了本申请提供的用于侧行链路通信的方法，下面结合具体的实施例简单介绍本申请提供的用于侧行链路通信的方法，在不同的侧行组播场景下的使用流程。
图13是本申请提供的一种指示时隙格式的示意图。该示意图包括左侧和右侧，其中，左侧为不同的DCI，右侧为不同的终端设备组。
假设，该网络设备覆盖范围内的侧行链路通信系统中一共有2个终端设备组，该2个终端设备组的标识分别为group#1和group#2，每个终端设备组中包括20个终端设备，20个终端设备的标识分别为终端设备#1～终端设备#20。由于DCI的尺寸限制，一个DCI只能指示终端设备组中10个终端设备对应的SFI信息，即DCI中携带的时隙格式联合指示信息只包括10个信息段分别为信息段#1～信息段#10，10个信息段与10个终端设备一一对应。
那么为了配置2个终端设备组中的终端设备的时隙格式，网络设备针对每个终端设备组下发两个DCI，每个DCI中包括10个信息段，分别用于指示一个终端设备组中的10个终端设备的SFI信息。
例如，针对group#1下发两个DCI(如图13中所示的第一DCI和第二DCI)，其中，第一DCI指示group#1中的终端设备#1～终端设备#10的时隙格式，第一DCI指示group#1中的终端设备#11～终端设备#20的时隙格式。具体地，第二DCI中需要携带指示的起始终端设备的标识(终端设备#11)。
首先，网络设备分别用该2个终端设备组的group-RNTI分别加扰2个终端设备组对应的DCI。则每组组组播中的终端设备接收到对应的DCI时能够基于group-RNTI解析DCI。
其次，针对每个终端设备组以及每个DCI，网络设备确定10个信息段与10个终端设备的标识之间的一一对应关系，将该一一对应关系通过半静态信令通知10个终端设备。则10个终端设备接收到DCI时能够基于该一一对应关系，以及自身的标识获取对应的信息段。其中，终端设备的标识为终端设备在所属的终端设备组中的相对标识。
如图13所示，第二个DCI中包括如下信息：
1)DCI格式标识，该DCI格式标识可以占用一个或多个比特；
2)起始终端设备的标识：终端设备组第11个终端设备的标识pair#11；
3)信息段#1(终端设备#11对应的SFI信息)、信息段#2(终端设备#12对应的SFI信息)、…、信息段#10(终端设备#20对应的SFI信息)。
图14是本申请提供的另一种指示时隙格式的示意图。该示意图包括第一行和第二行，其中，第一行为DCI，第二行为不同的终端设备组。
假设，该网络设备覆盖范围内的侧行链路通信系统中一共有2个终端设备组，该2个终端设备组的标识分别为group#1和group#2，每个终端设备组中包括20个终端设备，20个终端设备的标识分别为终端设备#1～终端设备#20。DCI中包括2个信息段分别对应该2个终端设备组，用于指示终端设备组对应的时隙格式。
首先，网络设备定义加扰DCI的RNTI，该RNTI通过半静态信令通知终端设备。则终端设备接收到DCI时能够基于该RNTI解析DCI。
其次，网络设备确定2个信息段与2个终端设备组的标识之间的一一对应关系，将该一一对应关系通过半静态信令通知终端设备。则终端设备组接收到DCI时能够基于该一一对应关系，以及终端设备组的标识获取对应的信息段。
如图14所示，DCI中包括如下信息：
1)DCI格式标识，该DCI格式标识可以占用一个或多个比特；
2)信息段#1(group#1的SFI信息)、信息段#2(group#2的SFI信息)。
以上，结合图6至图14详细说明了本申请实施例提供的用于侧行链路通信的方法。下面结合图15至图18细说明本申请实施例提供的用于侧行链路通信的装置。
参见图15，图15是本申请提出的用于侧行链路通信的装置10的示意图。如图15所示，装置10包括接收单元110、处理单元120。
接收单元110，用于接收网络设备发送的下行控制信息；所述下行控制信息中携带第一指示信息，其中，所述第一指示信息用于指示N1个终端设备组对应的时隙格式，一个终端设备组包括多个进行侧行链路组播通信的终端设备，N1为正整数。
处理单元120，用于解析所述下行控制信息。
装置10和方法实施例中的终端设备完全对应，装置10的相应单元用于执行图6所示的方法实施例中由终端设备执行的相应步骤。
其中，装置10中的接收单元110执行方法实施例中接收的步骤。例如，执行图6中从网络设备接收下行控制信息。处理单元120执行方法实施例中终端设备内部实现或处理的步骤。例如，执行图6中的解析下行控制信息。
可选地，装置10还可以包括发送单元130，用于向其他设备发送信息。接收单元110和发送单元130可以组成收发单元，同时具有接收和发送的功能。其中，处理单元120可以是处理器。接收单元110可以是接收器。发送单元130可以是发射器。接收器和发射器 可以集成在一起组成收发器。
参见图16，图16是适用于本申请实施例的终端设备20的结构示意图。该终端设备20可应用于图1所示出的系统中。为了便于说明，图16仅示出了终端设备的主要部件。如图16所示，终端设备20包括处理器、存储器、控制电路、天线以及输入输出装置。处理器用于控制天线以及输入输出装置收发信号，存储器用于存储计算机程序，处理器用于从存储器中调用并运行该计算机程序，以执行本申请提出的用于侧行链路通信的方法中由终端设备执行的相应流程和/或操作。此处不再赘述。
本领域技术人员可以理解，为了便于说明，图16仅示出了一个存储器和处理器。在实际的终端设备中，可以存在多个处理器和存储器。存储器也可以称为存储介质或者存储设备等，本申请实施例对此不做限制。
参见图17，图17是本申请提出的用于侧行链路通信的装置30的示意图。如图17所示，装置30包括发送单元310以及处理单元320。
处理单元320，用于确定下行控制信息，所述下行控制信息中携带第一指示信息，其中，所述第一指示信息用于指示N1个终端设备组对应的时隙格式，一个终端设备组包括多个进行侧行链路组播通信的终端设备，N1为正整数；
发送单元310，用于发送所述下行控制信息。
装置30和方法实施例中的网络设备完全对应，装置30的相应单元用于执行图6所示的方法实施例中由网络设备执行的相应步骤。
其中，装置30中的发送单元310执行方法实施例中网络设备发送的步骤。例如，执行图6中向终端设备发送下行控制信息的步骤120。处理单元120执行方法实施例中网络设备内部实现或处理的步骤。例如，执行图6中确定下行控制信息的步骤110。
可选地，装置30还可以包括接收单元330，用于接收其他设备发送信息。接收单元330和发送单元310可以组成收发单元，同时具有接收和发送的功能。其中，处理单元320可以是处理器。发送单元310可以是接收器。接收单元330可以是发射器。接收器和发射器可以集成在一起组成收发器。
参见图18，图18是适用于本申请实施例的网络设备40的结构示意图，可以用于实现上述用于侧行链路通信的方法中的网络设备的功能。如可以为基站的结构示意图。如图18所示，该网络设备可应用于如图1所示的系统中。
网络设备40可以包括一个或多个射频单元，如远端射频单元(remote radio unit，RRU)401和一个或多个基带单元(base band unit，BBU)。基带单元也可称为数字单元(digital unit，DU)402。所述RRU 401可以称为收发单元，与图17中的发送单元310对应。可选地，该收发单元401还可以称为收发机、收发电路、或者收发器等，其可以包括至少一个天线4011和射频单元4012。可选地，收发单元401可以包括接收单元和发送单元，接收单元可以对应于接收器(或称接收机、接收电路)，发送单元可以对应于发射器(或称发射机、发射电路)。所述RRU 401部分主要用于射频信号的收发以及射频信号与基带信号的转换，例如，用于向终端设备发送上述实施例中所述的控制信息。所述BBU 402部分主要用于进行基带处理，对基站进行控制等。所述RRU 401与BBU 402可以是物理上设置在一起，也可以物理上分离设置的，即分布式基站。
所述BBU 402为网络设备的控制中心，也可以称为处理单元，可以与图17中的处理 单元320对应，主要用于完成基带处理功能，如信道编码，复用，调制，扩频等。例如该BBU(处理单元)402可以用于控制网络设备40执行上述方法实施例中关于网络设备的操作流程，例如，确定承载终端设备的控制信息的符号的长度。
在一个示例中，所述BBU 402可以由一个或多个单板构成，多个单板可以共同支持单一接入制式的无线接入网(如，LTE系统，或5G系统)，也可以分别支持不同接入制式的无线接入网。所述BBU 402还包括存储器4021和处理器4022。所述存储器4021用以存储必要的指令和数据。例如存储器4021存储上述实施例中的码本等。所述处理器4022用于控制基站进行必要的动作，例如用于控制基站执行上述方法实施例中关于网络设备的操作流程。所述存储器4021和处理器4022可以服务于一个或多个单板。也就是说，可以每个单板上单独设置存储器和处理器。也可以是多个单板共用相同的存储器和处理器。此外每个单板上还可以设置有必要的电路。
应理解，图18所示的网络设备40能够实现图6-图17的方法实施例中涉及的网络设备功能。网络设备40中的各个单元的操作和/或功能，分别为了实现本申请方法实施例中由网络设备执行的相应流程。为避免重复，此处适当省略详述描述。图18示例的网络设备的结构仅为一种可能的形态，而不应对本申请实施例构成任何限定。本申请并不排除未来可能出现的其他形态的网络设备结构的可能。
本申请实施例还提供一种通信系统，其包括前述的网络设备和一个或多个终端设备。
本申请还提供了一种计算机可读存储介质，该计算机可读存储介质中存储有指令，当该指令在计算机上运行时，使得计算机执行上述如图6-图14所示的方法中网络设备执行的各个步骤。
本申请还提供了一种计算机可读存储介质，该计算机可读存储介质中存储有指令，当该指令在计算机上运行时，使得计算机执行上述如图6-图14所示的方法中终端设备执行的各个步骤。
本申请还提供了一种包含指令的计算机程序产品，当该计算机程序产品在计算机上运行时，使得计算机执行如图6-图14所示的方法中网络设备执行的各个步骤。
本申请还提供了一种包含指令的计算机程序产品，当该计算机程序产品在计算机上运行时，使得计算机执行如图6-图14所示的方法中终端设备执行的各个步骤。
本申请还提供一种芯片，包括处理器。该处理器用于读取并运行存储器中存储的计算机程序，以执行本申请提供的用于侧行链路通信的方法中由终端设备执行的相应操作和/或流程。可选地，该芯片还包括存储器，该存储器与该处理器通过电路或电线与存储器连接，处理器用于读取并执行该存储器中的计算机程序。进一步可选地，该芯片还包括通信接口，处理器与该通信接口连接。通信接口用于接收需要处理的数据和/或信息，处理器从该通信接口获取该数据和/或信息，并对该数据和/或信息进行处理。该通信接口可以是输入输出接口。
本申请还提供一种芯片，包括处理器。该处理器用于调用并运行存储器中存储的计算机程序，以执行本申请提供的用于侧行链路通信的方法中由网络设备执行的相应操作和/或流程。可选地，该芯片还包括存储器，该存储器与该处理器通过电路或电线与存储器连接，处理器用于读取并执行该存储器中的计算机程序。进一步可选地，该芯片还包括通信接口，处理器与该通信接口连接。通信接口用于接收需要处理的数据和/或信息，处理器 从该通信接口获取该数据和/或信息，并对该数据和/或信息进行处理。该通信接口可以是输入输出接口。
以上各实施例中，处理器可以为中央处理器(central processing unit，CPU)、微处理器、特定应用集成电路(application-specific integrated circuit，ASIC)，或一个或多个用于控制本申请技术方案程序执行的集成电路等。例如，处理器可以是数字信号处理器设备、微处理器设备、模数转换器、数模转换器等。处理器可以根据这些设备各自的功能而在这些设备之间分配终端设备或网络设备的控制和信号处理的功能。此外，处理器可以具有操作一个或多个软件程序的功能，软件程序可以存储在存储器中。处理器的所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块。
存储器可以是只读存储器(read-only memory，ROM)、可存储静态信息和指令的其它类型的静态存储设备、随机存取存储器(random access memory，RAM)或可存储信息和指令的其它类型的动态存储设备，也可以是电可擦可编程只读存储器(electrically erasable programmable read-only memory，EEPROM)、只读光盘(compact disc read-only memory，CD-ROM)或其他光盘存储、光碟存储(包括压缩光碟、激光碟、光碟、数字通用光碟、蓝光光碟等)、磁盘存储介质或者其它磁存储设备，或者还可以是能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其它介质等。
可选的，上述实施例中涉及的存储器与存储器可以是物理上相互独立的单元，或者，存储器也可以和处理器集成在一起。
本申请实施例中，“至少一个”是指一个或者多个，“多个”是指两个或两个以上。“和/或”，描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示单独存在A、同时存在A和B、单独存在B的情况。其中A，B可以是单数或者复数。字符“/”一般表示前后关联对象是一种“或”的关系。“以下至少一项”及其类似表达，是指的这些项中的任意组合，包括单项或复数项的任意组合。例如，a，b和c中的至少一项可以表示：a,b,c,a-b,a-c,b-c,或a-b-c，其中a,b,c可以是单个，也可以是多个。
本领域普通技术人员可以意识到，本文中公开的实施例中描述的各单元及算法步骤，能够以电子硬件、计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元也可以不是物理上分开的，作为单元显示的部件也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际 的需要选择其中的部分或者全部单元来实现本申请技术方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(read-only memory，ROM)、随机存取存储器(random access memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。本申请的保护范围应以所述权利要求的保护范围为准。

Claims (40)

  1. 一种用于侧行链路通信的方法，其特征在于，包括：
    网络设备确定下行控制信息，所述下行控制信息携带第一指示信息，其中，所述第一指示信息用于指示N1个终端设备组对应的时隙格式，一个终端设备组包括多个进行侧行链路组播通信的终端设备，N1为正整数；
    所述网络设备发送所述下行控制信息。
  2. 根据权利要求1所述的方法，其特征在于，所述N1等于1；
    所述第一指示信息用于指示N1个终端设备组对应的时隙格式，包括：
    所述第一指示信息用于指示第一终端设备组中的N个终端设备对应的时隙格式，所述第一指示信息包括N个信息段，所述N个信息段中的一个信息段用于指示所述第一终端设备组中的一个终端设备对应的时隙格式，所述N为正整数。
  3. 根据权利要求1所述的方法，其特征在于，所述N1大于1；
    所述第一指示信息用于指示所述N1个终端设备组对应的时隙格式，所述第一指示信息包括N1个信息段，所述N1个信息段中一个信息段用于指示所述N1个终端设备组中一个终端设备组对应的时隙格式。
  4. 根据权利要求2所述的方法，其特征在于，所述N个信息段与所述N个终端设备的对应关系为预先配置的，或者，所述方法还包括：
    所述网络设备向所述N个终端设备发送第二消息，所述第二消息包括所述N个信息段与所述N个终端设备的对应关系。
  5. 根据权利要求2或4所述的方法，其特征在于，所述下行控制信息中还包括第二指示信息，所述第二指示信息用于标识所述N个终端设备。
  6. 根据权利要求5所述的方法，其特征在于，所述第二指示信息包括所述N个终端设备中起始终端设备的标识；或者，
    所述第二指示信息包括所述N个终端设备中每个终端设备的标识。
  7. 根据权利要求3所述的方法，其特征在于，所述N1个信息段与所述N1个终端设备组的对应关系为预先配置的，或者，所述方法还包括：
    所述网络设备向所述N1个终端设备组中的终端设备发送第三消息，所述第三消息包括所述N1个信息段与所述N1个终端设备组的对应关系。
  8. 根据权利要求3或7所述的方法，其特征在于，所述一个终端设备组对应的时隙格式为一个终端设备组中的作为发送方的终端设备对应的时隙格式。
  9. 根据权利要求1-8中任一项所述的方法，其特征在于，所述网络设备发送所述下行控制信息之前，所述方法还包括：
    所述网络设备使用第一标识符加扰所述下行控制信息，其中，所述第一标识符为预先配置的或通过半静态信令通知的。
  10. 根据权利要求1-9中任一项所述的方法，其特征在于，所述方法还包括：
    所述网络设备向所述N1个终端设备组中的终端设备发送第三指示信息，所述第三指示信息用于指示第一搜索空间，所述第一搜索空间为检测所述下行控制信息的搜索空间。
  11. 一种用于侧行链路通信的方法，其特征在于，包括：
    终端设备接收网络设备发送的下行控制信息，所述下行控制信息携带第一指示信息，其中，所述第一指示信息用于指示N1个终端设备组对应的时隙格式，一个终端设备组包括多个进行侧行链路组播通信的终端设备，N1为正整数；
    所述终端设备解析所述下行控制信息。
  12. 根据权利要求11所述的方法，其特征在于，所述N1等于1；
    所述第一指示信息用于指示N1个终端设备组对应的时隙格式，包括：
    所述第一指示信息用于指示第一终端设备组中的N个终端设备对应的时隙格式，所述第一指示信息包括N个信息段，所述N个信息段中的一个信息段用于指示所述第一终端设备组中的一个终端设备对应的时隙格式。
  13. 根据权利要求11所述的方法，其特征在于，所述N1大于1；
    所述第一指示信息用于指示所述N1个终端设备组对应的时隙格式，所述第一指示信息包括N1个信息段，所述N1个信息段中一个信息段用于指示所述N1个终端设备组中一个终端设备组对应的时隙格式。
  14. 根据权利要求12所述的方法，其特征在于，所述N个信息段与所述N个终端设备的对应关系为预先配置的，或者，所述方法还包括：
    所述终端设备接收所述网络设备发送的第二消息，所述第二消息包括所述N个信息段与所述N个终端设备的对应关系。
  15. 根据权利要求12或14所述的方法，其特征在于，所述下行控制信息中还包括第二指示信息，所述第二指示信息用于标识所述N个终端设备。
  16. 根据权利要求15所述的方法，其特征在于，所述第二指示信息包括所述N个终端设备中起始终端设备的标识；或者，
    所述第二指示信息包括所述N个终端设备中每个终端设备的标识。
  17. 根据权利要求13所述的方法，其特征在于，所述N1个信息段与所述N1个终端设备组的对应关系为预先配置的，或者，所述方法还包括：
    所述终端设备接收所述网络设备发送的第三消息，所述第三消息包括所述N1个信息段与所述N1个终端设备组的对应关系。
  18. 根据权利要求13或17所述的方法，其特征在于，所述一个终端设备组对应的时隙格式为一个终端设备组中的作为发送方的终端设备对应的时隙格式；
    所述方法还包括：
    所述终端设备启动自动检测的传输方式在所述终端设备组对应的时隙格式上检测能够传输的资源，根据检测结果确定自身的时隙格式；或者，
    所述终端设备根据所述终端设备组对应的时隙格式，为所述终端设备组中的终端设备分配资源，确定自身的时隙格式。
  19. 根据权利要求11-18中任一项所述的方法，其特征在于，所述终端设备接收所述网络设备发送的所述下行控制信息之前，所述方法还包括：
    所述终端设备获取第一标识符，所述第一标识符用于加扰所述下行控制信息；
    所述终端设备获取第一标识符包括：
    所述第一标识为预先配置的，或者，所述终端设备接收所述网络设备发送的半静态信 令，所述半静态信令中携带所述第一标识符。
  20. 根据权利要求11-19中任一项所述的方法，其特征在于，所述方法还包括：
    所述终端设备接收所述网络设备发送的第三指示信息，所述第三指示信息用于指示第一搜索空间，其中，所述第一搜索空间为检测所述下行控制信息的搜索空间。
  21. 一种网络设备，其特征在于，包括：
    处理单元，用于确定下行控制信息，所述下行控制信息携带第一指示信息，其中，所述第一指示信息用于指示N1个终端设备组对应的时隙格式，一个终端设备组包括多个进行侧行链路组播通信的终端设备，N1为正整数；
    发送单元，用于发送所述下行控制信息。
  22. 根据权利要求21所述的网络设备，其特征在于，所述N1等于1；
    所述第一指示信息用于指示N1个终端设备组对应的时隙格式，包括：
    所述第一指示信息用于指示第一终端设备组中的N个终端设备对应的时隙格式，所述第一指示信息包括N个信息段，所述N个信息段中的一个信息段用于指示所述第一终端设备组中的一个终端设备对应的时隙格式，所述N为正整数。
  23. 根据权利要求21所述的网络设备，其特征在于，所述N1大于1；
    所述第一指示信息用于指示所述N1个终端设备组对应的时隙格式，所述第一指示信息包括N1个信息段，所述N1个信息段中一个信息段用于指示所述N1个终端设备组中一个终端设备组对应的时隙格式。
  24. 根据权利要求22所述的网络设备，其特征在于，所述N个信息段与所述N个终端设备的对应关系为预先配置的，或者，所述发送单元，还用于向所述N个终端设备发送第二消息，所述第二消息包括所述N个信息段与所述N个终端设备的对应关系。
  25. 根据权利要求22或24所述的网络设备，其特征在于，所述下行控制信息中还包括第二指示信息，所述第二指示信息用于标识所述N个终端设备。
  26. 根据权利要求25所述的网络设备，其特征在于，所述第二指示信息包括所述N个终端设备中起始终端设备的标识；或者，
    所述第二指示信息包括所述N个终端设备中每个终端设备的标识。
  27. 根据权利要求23所述的网络设备，其特征在于，所述N1个信息段与所述N1个终端设备组的对应关系为预先配置的，或者，所述发送单元，还用于向所述N1个终端设备组中的终端设备发送第三消息，所述第三消息包括所述N1个信息段与所述N1个终端设备组的对应关系。
  28. 根据权利要求23或27所述的网络设备，其特征在于，所述一个终端设备组对应的时隙格式为一个终端设备组中的作为发送方的终端设备对应的时隙格式。
  29. 根据权利要求21-28中任一项所述的网络设备，其特征在于，所述发送单元发送所述下行控制信息之前，所述处理单元，还用于使用第一标识符加扰所述下行控制信息，其中，所述第一标识符为预先配置的或通过半静态信令通知的。
  30. 根据权利要求21-29中任一项所述的网络设备，其特征在于，所述发送单元，还用于向所述N1个终端设备组中的终端设备发送第三指示信息，所述第三指示信息用于指示第一搜索空间，所述第一搜索空间为检测所述下行控制信息的搜索空间。
  31. 一种终端设备，其特征在于，包括：
    接收单元，用于接收网络设备发送的下行控制信息，所述下行控制信息携带第一指示信息，其中，所述第一指示信息用于指示N1个终端设备组对应的时隙格式，一个终端设备组包括多个进行侧行链路组播通信的终端设备，N1为正整数；
    处理单元，用于解析所述下行控制信息。
  32. 根据权利要求31所述的终端设备，其特征在于，所述N1等于1；
    所述第一指示信息用于指示N1个终端设备组对应的时隙格式，包括：
    所述第一指示信息用于指示第一终端设备组中的N个终端设备对应的时隙格式，所述第一指示信息包括N个信息段，所述N个信息段中的一个信息段用于指示所述第一终端设备组中的一个终端设备对应的时隙格式，所述N为正整数。
  33. 根据权利要求31所述的终端设备，其特征在于，所述N1大于1；
    所述第一指示信息用于指示所述N1个终端设备组对应的时隙格式，所述第一指示信息包括N1个信息段，所述N1个信息段中一个信息段用于指示所述N1个终端设备组中一个终端设备组对应的时隙格式。
  34. 根据权利要求32所述的终端设备，其特征在于，所述N个信息段与所述N个终端设备的对应关系为预先配置的，或者，所述接收单元，还用于接收所述网络设备发送的第二消息，所述第二消息包括所述N个信息段与所述N个终端设备的对应关系。
  35. 根据权利要求32或34所述的终端设备，其特征在于，所述下行控制信息中还包括第二指示信息，所述第二指示信息用于标识所述N个终端设备。
  36. 根据权利要求35所述的终端设备，其特征在于，所述第二指示信息包括所述N个终端设备中起始终端设备的标识；或者，
    所述第二指示信息包括所述N个终端设备中每个终端设备的标识。
  37. 根据权利要求33所述的终端设备，其特征在于，所述N1个信息段与所述N1个终端设备组的对应关系为预先配置的，或者，所述接收单元，还用于接收所述网络设备发送的第三消息，所述第三消息包括所述N1个信息段与所述N1个终端设备组的对应关系。
  38. 根据权利要求33或37所述的终端设备，其特征在于，所述一个终端设备组对应的时隙格式为一个终端设备组中的作为发送方的终端设备对应的时隙格式；
    所述处理单元，还用于启动自动检测的传输方式在所述终端设备组对应的时隙格式上检测能够传输的资源，根据检测结果确定自身的时隙格式；或者，
    所述处理单元，还用于根据所述终端设备组对应的时隙格式，为所述终端设备组中的终端设备分配资源，确定自身的时隙格式。
  39. 根据权利要求31-38中任一项所述的终端设备，其特征在于，所述接收单元接收所述网络设备发送的所述下行控制信息之前，所述接收单元还用于获取第一标识符，所述第一标识符用于加扰所述下行控制信息；
    所述接收单元获取第一标识符包括：
    所述第一标识为预先配置的，或者，所述接收单元接收所述网络设备发送的半静态信令，所述半静态信令中携带所述第一标识符。
  40. 根据权利要求31-39中任一项所述的终端设备，其特征在于，所述接收单元，还用于接收所述网络设备发送的第三指示信息，所述第三指示信息用于指示第一搜索空间，其中，所述第一搜索空间为检测所述下行控制信息的搜索空间。
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