WO2020177169A1 - 通信的方法、装置及系统 - Google Patents

通信的方法、装置及系统 Download PDF

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Publication number
WO2020177169A1
WO2020177169A1 PCT/CN2019/080217 CN2019080217W WO2020177169A1 WO 2020177169 A1 WO2020177169 A1 WO 2020177169A1 CN 2019080217 W CN2019080217 W CN 2019080217W WO 2020177169 A1 WO2020177169 A1 WO 2020177169A1
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identifier
mac pdu
target
information
target identifier
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PCT/CN2019/080217
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English (en)
French (fr)
Inventor
余唱
常俊仁
肖潇
刘俊
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华为技术有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/535—Allocation or scheduling criteria for wireless resources based on resource usage policies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • 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]
    • H04W4/48—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for in-vehicle communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling

Definitions

  • This application relates to the field of communication, and in particular to communication methods, devices and systems.
  • IoV Internet of Vehicles
  • PSCCH Physical sidelink control channel
  • PPPP ProSe per-packet priority
  • the resource allocation information is used to indicate the side link shared channel A transmission block (TB) is transmitted on the (sidelink share channel, SL-SCH), and information related to receiving the TB is provided.
  • the SCI may also provide related information about Hybrid Automatic Repeat Request (HARQ), such as retransmission instructions, retransmission resources, etc.
  • HARQ Hybrid Automatic Repeat Request
  • the Media Access Control decodes the TB to obtain the media access control packet Data unit (MAC packet data unit, MAC PDU).
  • MAC packet data unit MAC packet data unit
  • the structure of the MAC PDU is shown in Figure 1, including a MAC header, a media access control service data unit (MAC SDU), and a padding (padding) part.
  • the MAC header includes the SL-SCH subheader
  • the format of the SL-SCH subheader is shown in Figure 2 or Figure 3. It can be seen from FIG. 2 or FIG. 3 that the SL-SCH subheader includes the V field, the SRC field, and the DST field.
  • the length of the V field is 4 bits, indicating the format version number of the SL-SCH.
  • the DST field indicates the identifier of the receiving end of the TB (also referred to as the target identifier), and the length of the SRC field is 24 bits, indicating the identifier of the transmitting end of the TB (also referred to as the source identifier). Therefore, in LTE V2X, the MAC PDU obtained after decoding the TB always carries the transmitter identifier and the receiver identifier.
  • the length of the DST field is 16 bits, and this field carries the destination layer-2 identification (DestinationLayer-2 ID) The most important 16 bits in ); or, when the value of the V field is "0011", as shown in Figure 3, the length of the DST field is 24 bits, and this field carries the Destination Layer-2 ID.
  • NR IoV communication it is allowed to carry the TB's sender identification and/or receiver identification in the SCI.
  • the data format in LTE IoV communication continues to be used, that is, in layer 2.
  • Including the above-mentioned transmitter identifier and receiver identifier in the PDU will cause data redundancy. Therefore, in NR IoV communication, how to reduce data redundancy is a problem that needs to be solved urgently.
  • the embodiments of the present application provide a communication method, device, and system, which can reduce data redundancy, thereby reducing layer 2 PDU overhead.
  • the first terminal device receives the side link control information SCI from the second terminal device; the first terminal device also receives the transmission block TB from the second terminal device, and the TB includes layer 2 PDU.
  • the SCI includes the first source identifier, the layer 2 PDU does not include the layer 2 source identifier, the first source identifier is the layer 2 source identifier, or the first source identifier is the physical layer source identifier; or The SCI includes the first target identifier, the layer 2 PDU does not include the layer 2 target identifier, the first target identifier is the layer 2 target identifier, or the first target identifier is the physical layer target identifier; or, the SCI includes The second source identifier, the layer 2 PDU includes a third source identifier, the second source identifier is the first bit in the layer 2 source identifier, and the third source identifier is the layer 2 source identifier except the first bit Bits other than bits; or, the SCI includes a second target identifier, and the layer 2 PDU includes a third target identifier, where the second target identifier is the second bit in the layer 2 target identifier , The third target identifier is the other bits in the layer 2
  • the above physical layer source identifier includes a source identifier generated according to the above layer 2 source identifier; the above physical layer target identifier includes a target identifier generated according to the above layer 2 target identifier. Since in the embodiment of this application, the SCI includes the source identifier generated according to the layer 2 source identifier and/or the target identifier generated according to the layer 2 target identifier, the layer 2 PDU does not include the layer 2 source identifier and/or the layer 2 target identifier This avoids carrying redundant identification information in the layer 2 PDU, thereby reducing data redundancy and reducing the overhead of the layer 2 PDU.
  • the first terminal device determines the service type corresponding to the TB according to the first target identifier. Since in the embodiment of the present application, the service type corresponding to the above TB can be determined, unicast, multicast, and broadcast can be distinguished, so that the first terminal device can perform corresponding subsequent processing according to different service types.
  • the first terminal device determines the type of the third target identifier according to the second target identifier.
  • the first terminal device determining the type of the third target identifier according to the second target identifier includes: the first terminal device determines the service type corresponding to the TB according to the second target identifier; A terminal device determines the type of the third target identifier according to the service type corresponding to the TB.
  • the first terminal device determines the type of the third target identifier according to the service type corresponding to the TB, including: the service type corresponding to the TB is unicast, and the first terminal device determines the third The type of the target identifier is the identifier of the target terminal device; or, the service type corresponding to the TB is multicast, and the first terminal device determines that the type of the third target identifier is the target group identifier; or, the service type corresponding to the TB is Broadcast, the first terminal device determines that the type of the third target identifier is a target service identifier.
  • the type of the third target identifier can be determined, different service types can be distinguished according to the type of the third target identifier, so that the first terminal device can perform corresponding subsequent processing according to different service types.
  • the embodiments of the present application provide a communication method, device, and system, which can distinguish the service type corresponding to the MAC PDU, or can distinguish the type of target identifier carried in the MAC PDU, or can distinguish whether the MAC PDU carries the source identifier and /Or the target identifier, so that the first terminal device can perform corresponding subsequent processing according to different service types.
  • the first terminal device receives a transmission block TB from the second terminal device, and the TB includes a media access control packet data unit MAC PDU; the first terminal device obtains first information, where the first information includes One of the following information: hybrid automatic repeat request HARQ process information, information in the V field in the MAC PDU header, dedicated bit indication information, and information about the transmission channel of the TB; the first information is used to indicate that the MAC PDU carries The type of the target identifier, or the first information is used to indicate the service type corresponding to the MAC PDU, or the first information is used to indicate that the MAC PDU carries the source identifier and/or the target identifier, or the first The information is used to indicate that the source identifier and/or target identifier are not carried in the MAC PDU.
  • the first information includes One of the following information: hybrid automatic repeat request HARQ process information, information in the V field in the MAC PDU header, dedicated bit indication information, and information about the transmission channel of the TB; the first
  • the first information may indicate the type of target identifier carried in the MAC PDU, or the service type corresponding to the MAC PDU, or the MAC PDU carries the target identifier and/or source identifier, or The MAC PDU does not carry the target identifier and/or the source identifier. Therefore, the first terminal device can perform corresponding subsequent processing according to different service types or target identifier types or content carried in the MAC PDU.
  • the foregoing HARQ process information is the first HARQ process information, the type of the target identifier is the identifier of the target terminal device, and/or the service type is unicast; or, the HARQ process information is the first HARQ process information.
  • the type of the target identifier is the target group identifier, and/or the service type is multicast; or, the HARQ process information is the third HARQ process information, and the type of the target identifier is the target service identifier, and / Or, the service type is broadcast.
  • the HARQ process information can indicate the type of target identifier carried in the MAC PDU and/or the service type corresponding to the MAC PDU. Therefore, the first terminal device can be configured according to different service types and/or The type of target identification is processed accordingly.
  • the HARQ process information is the first HARQ process information, and the MAC PDU carries the target identifier; or, the HARQ process information is the second HARQ process information, and the MAC PDU carries the source identifier; Or, the HARQ process information is the third HARQ process information, and the MAC PDU carries the source identifier and the target identifier; or, the HARQ process information is the fourth HARQ process information, and the MAC PDU does not carry the source identifier and the target identifier.
  • the HARQ process information is the fifth HARQ process information, and the MAC PDU does not carry the target identifier; or, the HARQ process information is the sixth HARQ process information, and the MAC PDU does not carry the source identifier.
  • the HARQ process information may indicate whether the MAC PDU carries the source identifier and/or the target identifier. Therefore, the first terminal device can perform corresponding subsequent processing according to the content carried in the MAC PDU.
  • the unicast service type may indicate that the MAC PDU carries the source identifier and/or target identifier; or, the HARQ process information indicates MAC
  • the multicast service type may indicate that the MAC PDU carries the source identifier and/or the target identifier; or, when the HARQ process information indicates that the service type corresponding to the MAC PDU is broadcast, the broadcast service type may Indicates that the source identifier and/or target identifier are not carried in the MAC PDU.
  • the unicast service type may indicate that the MAC PDU does not carry the source identifier and/or target identifier; or, the HARQ information indicates the MAC
  • the multicast service type can indicate that the MAC PDU does not carry the source identifier and/or target identifier; or HARQ information indicates that the service type corresponding to the MAC PDU is broadcast, the broadcast service type It may indicate that the source identifier and/or target identifier are carried in the MAC PDU.
  • the V field in the MAC PDU header is the first value, the type of the target identifier is the identifier of the target terminal device, and/or the service type is unicast; or, the MAC PDU header
  • the V field is the second value, the type of the target identifier is the target group identifier, and/or the service type is multicast; or the V field in the MAC PDU header is the third value, the type of the target identifier Is the target service identifier, and/or the service type is broadcast.
  • the information in the V field in the MAC PDU header can indicate the type of target identifier carried in the MAC PDU and/or the service type corresponding to the MAC PDU. Therefore, the first terminal device can be configured to The business type and/or the type of the target identifier are processed accordingly.
  • the V field in the MAC PDU header is the first value, and the MAC PDU carries the target identifier; or the V field in the MAC PDU header is the second value, and the MAC PDU carries The source identifier; or, the V field in the MAC PDU header is the third value, and the MAC PDU carries the source identifier and the target identifier; or, the V field in the MAC PDU header is the fourth value, and the MAC PDU Does not carry the source identifier and the target identifier; or, the V field in the MAC PDU header is the fifth value, and the MAC PDU does not carry the target identifier; or, the V field in the MAC PDU header is the sixth value ,
  • the source identifier is not carried in the MAC PDU.
  • the HARQ process information may indicate whether the MAC PDU carries the source identifier and/or the target identifier. Therefore, the first terminal device can perform corresponding subsequent processing
  • the unicast service type when the value of the V field indicates that the service type corresponding to the MAC PDU is unicast, the unicast service type may indicate that the MAC PDU carries the source identifier and/or target identifier; or, the value of the V field
  • the multicast service type may indicate that the MAC PDU carries the source identifier and/or the target identifier; or the value of the V field indicates that the service type corresponding to the MAC PDU is broadcast
  • the broadcast service type may indicate that the source identifier and/or target identifier are not carried in the MAC PDU.
  • the unicast service type when the value of the V field indicates that the service type corresponding to the MAC PDU is unicast, the unicast service type may indicate that the MAC PDU does not carry the source identifier and/or target identifier; or, the value of the V field
  • the multicast service type may indicate that the MAC PDU does not carry the source identifier and/or target identifier; or the value of the V field indicates that the service type corresponding to the MAC PDU is broadcast
  • the broadcast service type may indicate that the source identifier and/or target identifier are carried in the MAC PDU.
  • the first N bits in the MAC PDU header indicated by the dedicated bit indication information are the fourth value, the target identifier type is the target terminal device identifier, and/or the service type is single Where N is a positive integer; or, the first N bits in the MAC PDU header indicated by the dedicated bit indication information are the fifth value, the type of the target identifier is the target group identifier, and/or the service type is Multicast; or, the first N bits in the MAC PDU header indicated by the dedicated bit indication information are the sixth value, the type of the target identifier is the target service identifier, and/or the service type is broadcast.
  • the dedicated bit indication information can indicate the type of target identifier carried in the MAC PDU and/or the service type corresponding to the MAC PDU. Therefore, the first terminal device can be configured to respond to different service types and/or The type of target identification is processed accordingly.
  • the first N bits in the MAC PDU header indicated by the dedicated bit indication information are the first value, and the MAC PDU carries the target identifier, where N is a positive integer; or, the dedicated bit The first N bits in the MAC PDU header indicated by the indication information are the second value, and the MAC PDU carries the source identifier; or the first N bits in the MAC PDU header indicated by the dedicated bit indication information are the third value, The MAC PDU carries the source identifier and the target identifier; or, the first N bits in the MAC PDU header indicated by the dedicated bit indication information are the fourth value, and the MAC PDU does not carry the source identifier and the target identifier; Or, the first N bits in the MAC PDU header indicated by the dedicated bit indication information are the fifth value, and the MAC PDU does not carry the target identifier, where N is a positive integer; or, the MAC indicated by the dedicated bit indication information The first N bits in the PDU header are the sixth value, and
  • the unicast service type may indicate that the MAC PDU carries the source identifier and/or target identifier; or, the dedicated bit indication information indicates
  • the multicast service type may indicate that the MAC PDU carries the source identifier and/or the target identifier; or, when the dedicated bit indication information indicates that the service type corresponding to the MAC PDU is broadcast, the broadcast service The type may indicate that the source identifier and/or target identifier are not carried in the MAC PDU.
  • the unicast service type may indicate that the MAC PDU does not carry the source identifier and/or target identifier; or, the dedicated bit indication information
  • the multicast service type may indicate that the MAC PDU does not carry the source identifier and/or target identifier; or, when the dedicated bit indication information indicates that the service type corresponding to the MAC PDU is broadcast, this The broadcast service type may indicate that the source identifier and/or the target identifier are carried in the MAC PDU.
  • the transmission channel of the TB is a sidelink unicast transmission channel
  • the type of the target identification is the identification of the target terminal device, and/or the service type is unicast
  • the TB The transmission channel of is a side link multicast transmission channel
  • the type of the target identifier is a target group identifier, and/or the service type is multicast
  • the transmission channel of the TB is a side link broadcast transmission channel
  • the type of the target identifier is the target service identifier, and/or the service type is broadcast.
  • the information of the transmission channel of the TB can indicate the type of the target identifier carried in the MAC PDU and/or the service type corresponding to the MAC PDU. Therefore, the first terminal device can be configured according to different service types and / Or the type of the target identifier is processed accordingly.
  • the transmission channel information of the TB is the first transmission channel information, and the MAC PDU carries the target identifier; or, the transmission channel information of the TB is the second transmission channel information, and the MAC PDU
  • the source identifier is carried in the TB; or, the transmission channel information of the TB is the third transmission channel information, and the MAC PDU carries the source identifier and the target identifier; or, the transmission channel information of the TB is the fourth transmission channel information ,
  • the MAC PDU does not carry the source identifier and the target identifier; or, the transmission channel information of the TB is the fifth transmission channel information, and the MAC PDU does not carry the target identifier; or, the transmission channel information of the TB It is the sixth transmission channel information, and the source identifier is not carried in the MAC PDU.
  • the HARQ process information may indicate whether the MAC PDU carries the source identifier and/or the target identifier. Therefore, the first terminal device
  • the unicast service type when the transmission channel information of the TB indicates that the service type corresponding to the MAC PDU is unicast, the unicast service type may indicate that the MAC PDU carries the source identifier and/or target identifier; or, the transmission channel of the TB
  • the multicast service type may indicate that the MAC PDU carries the source identifier and/or the target identifier; or, when the transmission channel information of the TB indicates that the service type corresponding to the MAC PDU is broadcast, The broadcast service type may indicate that the source identifier and/or target identifier are not carried in the MAC PDU.
  • the unicast service type may indicate that the MAC PDU does not carry the source identifier and/or target identifier; or, TB transmission
  • the multicast service type may indicate that the MAC PDU does not carry the source identifier and/or target identifier; or the transmission channel information of the TB indicates that the service type corresponding to the MAC PDU is broadcast
  • the broadcast service type may indicate that the source identifier and/or target identifier are carried in the MAC PDU.
  • a communication device for implementing the above-mentioned various methods.
  • the communication device may be the first terminal device in the foregoing first aspect, such as a vehicle-mounted communication device, or a device including the foregoing first terminal device, such as various types of vehicles, or a device included in the foregoing first terminal device , Such as a system chip; or, the communication device may be the first terminal device in the second aspect, such as a vehicle-mounted communication device, or a device containing the first terminal device, such as various types of vehicles, or the first terminal device described above.
  • a device included in a terminal device such as a system chip.
  • the communication device includes a module, unit, or means corresponding to the foregoing method, and the module, unit, or means can be implemented by hardware, software, or hardware execution of corresponding software.
  • the hardware or software includes one or more modules or units corresponding to the above-mentioned functions.
  • a communication device including: a processor and a memory; the memory is used to store computer instructions, and when the processor executes the instructions, the communication device executes the method described in any of the above aspects.
  • the communication device may be the first terminal device in the foregoing first aspect, such as a vehicle-mounted communication device, or a device including the foregoing first terminal device, such as various types of vehicles, or a device included in the foregoing first terminal device , Such as a system chip; or, the communication device may be the first terminal device in the second aspect, such as a vehicle-mounted communication device, or a device containing the first terminal device, such as various types of vehicles, or the first terminal device described above.
  • a device included in a terminal device such as a system chip.
  • a communication device including: a processor; the processor is configured to couple with a memory, and after reading an instruction in the memory, execute the method according to any of the foregoing aspects according to the instruction.
  • the communication device may be the first terminal device in the foregoing first aspect, such as a vehicle-mounted communication device, or a device including the foregoing first terminal device, such as various types of vehicles, or a device included in the foregoing first terminal device , Such as a system chip; or, the communication device may be the first terminal device in the second aspect, such as a vehicle-mounted communication device, or a device containing the first terminal device, such as various types of vehicles, or the first terminal device described above.
  • a device included in a terminal device such as a system chip.
  • a computer-readable storage medium stores instructions, when the instructions run on a communication device, the communication device can execute the method described in any of the above aspects.
  • the communication device may be the first terminal device in the foregoing first aspect, such as a vehicle-mounted communication device, or a device including the foregoing first terminal device, such as various types of vehicles, or a device included in the foregoing first terminal device , Such as a system chip; or, the communication device may be the first terminal device in the second aspect, such as a vehicle-mounted communication device, or a device containing the first terminal device, such as various types of vehicles, or the first terminal device described above.
  • a device included in a terminal device such as a system chip.
  • a computer program product containing instructions when the instructions are executed on a communication device, the communication device can execute the method described in any of the above aspects.
  • the communication device may be the first terminal device in the foregoing first aspect, such as a vehicle-mounted communication device, or a device including the foregoing first terminal device, such as various types of vehicles, or a device included in the foregoing first terminal device , Such as a system chip; or, the communication device may be the first terminal device in the second aspect, such as a vehicle-mounted communication device, or a device containing the first terminal device, such as various types of vehicles, or the first terminal device described above.
  • a device included in a terminal device such as a system chip.
  • a communication device for example, the communication device may be a chip or a chip system
  • the communication device includes a processor for implementing the functions involved in any of the foregoing aspects.
  • the communication device further includes a memory for storing necessary program instructions and data.
  • the communication device is a chip system, it may be composed of chips, or may include chips and other discrete devices.
  • the technical effects brought by any one of the design methods of the third aspect to the eighth aspect can be referred to the technical effects brought about by the different design methods in the first aspect or the second aspect, which will not be repeated here.
  • a communication system which includes the first terminal device described in the foregoing aspect and the second terminal device described in the foregoing aspect.
  • Figure 1 is a schematic diagram of the existing MAC PDU structure
  • Fig. 2 is a schematic diagram 1 of the existing SL-SCH sub-header format
  • FIG. 3 is a second schematic diagram of the format of the existing SL-SCH subheader
  • Figure 4a is a schematic diagram of communication in a broadcast scenario provided by an embodiment of the application.
  • Figure 4b is a schematic diagram of communication in a multicast scenario provided by an embodiment of the application.
  • FIG. 5 is a schematic diagram of a communication system provided by an embodiment of this application.
  • FIG. 6 is a schematic structural diagram of a terminal device provided by an embodiment of the application.
  • FIG. 7 is a first schematic flowchart of a communication method provided by an embodiment of this application.
  • FIG. 8 is a second schematic flowchart of a communication method provided by an embodiment of this application.
  • FIG. 9 is a schematic diagram of a protocol layer of a first terminal device according to an embodiment of the application.
  • FIG. 10 is another schematic structural diagram of the first terminal device provided by an embodiment of this application.
  • broadcast is a one-to-all communication mode
  • multiple terminal members can be included in a broadcast domain, and terminal members in the broadcast domain can communicate with each other after accessing the network.
  • any terminal in the broadcast domain that has been connected to the network can be used as a broadcast source to send broadcast messages; at the same time, it can be a broadcast member to receive broadcast messages.
  • the terminal members that have joined the network in the broadcast domain include terminal 1, terminal 2, terminal 3, terminal 4, terminal 5, and terminal 6.
  • terminal 1 as the broadcast source as an example, the corresponding communication diagram can be as shown in Figure 4a, that is, the broadcast message sent by terminal 1 can be transmitted to terminal 2, terminal 3, terminal 4, terminal 5, and terminal in the broadcast domain. 6.
  • multiple terminal devices may form a multicast group (also referred to as a multicast group).
  • the multicast group address is used as the destination address
  • the source sending the message is called the multicast source
  • the multicast user receiving the multicast data is called the multicast member.
  • the terminal members in a local area network (LAN) group include terminal 1, terminal 2, terminal 3, terminal 4, terminal 5, and terminal 6.
  • LAN local area network
  • terminal 1 the multicast source and terminal 3, terminal 5, and terminal 6 as multicast members to form a multicast group
  • the corresponding communication diagram can be shown in Figure 4b, that is, the multicast message sent by terminal 1 can be They are respectively transmitted to terminal 3, terminal 5 and terminal 6 in the multicast group.
  • At least one item (a) refers to any combination of these items, including any combination of a single item (a) or plural items (a).
  • at least one item (a) of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple .
  • words such as “first” and “second” are used to distinguish the same items or similar items with substantially the same function and effect. Those skilled in the art can understand that words such as “first” and “second” do not limit the quantity and order of execution, and words such as “first” and “second” do not limit the difference.
  • the communication system 20 includes a first terminal device 30 and a second terminal device 40 connected to the first terminal device 30.
  • the first terminal device receives the SCI and TB from the second terminal device.
  • the TB includes layer 2 PDUs, where the SCI includes source identification and/or target identification, and layer 2 PDUs may not include source identification and/or target identification.
  • the specific implementation of this solution will be described in subsequent method embodiments. The detailed description will not be repeated here.
  • the source identifier and/or target identifier may not be included in the layer 2 PDU, which reduces data redundancy and saves the overhead of the layer 2 PDU.
  • the first terminal device receives the TB from the second terminal device.
  • the TB includes a MAC PDU
  • the first terminal device can obtain first information that indicates the service type corresponding to the MAC PDU, or the first information indicates the type of target identifier carried in the MAC PDU, or The first information indicates that the MAC PDU carries the target identification and/or source identification, or the first information indicates that the MAC PDU does not carry the target identification and/or source identification, and the specific implementation of the solution will be implemented in subsequent methods The detailed description in the example will not repeat it here.
  • the first terminal device can distinguish different services based on the service type, so as to perform corresponding processing according to different services later; or, because the first information indicates that the MAC PDU carries The type of the target identifier, which can reflect the service type of the MAC PDU. Therefore, the first terminal device can distinguish different service types so that subsequent corresponding processing can be performed according to different services; or, because the first information indicates Whether the MAC PDU carries the source identifier and/or the target identifier, therefore, the first terminal device can perform corresponding processing according to the content carried in the MAC PDU.
  • the terminal device in the embodiment of the present application may be a vehicle; it may also be a vehicle-mounted terminal installed on a vehicle to assist the vehicle in driving, or a vehicle-mounted terminal Chip in the terminal.
  • the vehicle-mounted terminal may be a user equipment (UE), an access terminal, and a terminal unit in a fifth generation (5th generation, 5G) network or a public land mobile network (PLMN) that will evolve in the future.
  • the access terminal can be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), with wireless communication Functional handheld devices, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices or wearable devices, virtual reality (VR) terminal devices, augmented reality (AR) terminal devices, industrial control (industrial) Wireless terminal in control) or wireless terminal in self-driving (self-driving), etc.
  • the vehicle-mounted terminal can be mobile or fixed.
  • the first terminal device 30 and the second terminal device 40 in the embodiment of the present application may also be referred to as communication devices (or communication devices), which may be a general-purpose device or a special-purpose device. There is no specific restriction on this.
  • the first terminal device or the second terminal device in FIG. 5 may be implemented by the communication device (or communication apparatus) 60 in FIG. 6.
  • FIG. 6 is a schematic structural diagram of a communication device 60 provided by an embodiment of this application.
  • the communication device 60 includes one or more processors 601, a communication line 602, and at least one communication interface (in FIG. 6 it is only an example that includes a communication interface 604 and a processor 601 as an example), optional
  • the memory 603 may also be included.
  • the processor 601 can be a general-purpose central processing unit (central processing unit, CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more programs for controlling the execution of the program of this application. integrated circuit.
  • CPU central processing unit
  • ASIC application-specific integrated circuit
  • the communication line 602 may include a path for connecting different components.
  • the communication interface 604 may be a transceiver module for communicating with other devices or communication networks, such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc.
  • the transceiver module may be a device such as a transceiver or a transceiver.
  • the communication interface 604 may also be a transceiver circuit located in the processor 601 to implement signal input and signal output of the processor.
  • the memory 603 may be a device having a storage function. For example, it can be read-only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory (RAM), or other types that can store information and instructions Dynamic storage devices can also be electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM), or other optical disk storage, optical disc storage ( Including compact discs, laser discs, optical discs, digital universal discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or can be used to carry or store desired program codes in the form of instructions or data structures and can be stored by a computer Any other media taken, but not limited to this.
  • the memory may exist independently and is connected to the processor through the communication line 602. The memory can also be integrated with the processor.
  • the memory 603 is used to store computer-executable instructions for executing the solution of the present application, and the processor 601 controls the execution.
  • the processor 601 is configured to execute computer-executable instructions stored in the memory 603, so as to implement the communication method provided in the embodiment of the present application.
  • the processor 601 may also perform processing-related functions in the communication method provided in the following embodiments of this application, and the communication interface 604 is responsible for communicating with other devices or communication networks.
  • the embodiment does not specifically limit this.
  • the computer-executable instructions in the embodiments of the present application may also be referred to as application program code, which is not specifically limited in the embodiments of the present application.
  • the processor 601 may include one or more CPUs, such as CPU0 and CPU1 in FIG. 6.
  • the communication device 60 may include multiple processors, such as the processor 601 and the processor 608 in FIG. 6. Each of these processors can be a single-CPU (single-CPU) processor or a multi-core (multi-CPU) processor.
  • the processor here may refer to one or more devices, circuits, and/or processing cores for processing data (for example, computer program instructions).
  • the communication device 600 may further include an output device 605 and an input device 606.
  • the output device 605 communicates with the processor 601, and can display information in a variety of ways.
  • the output device 605 may be a liquid crystal display (LCD), a light emitting diode (LED) display device, a cathode ray tube (CRT) display device, or a projector (projector) Wait.
  • the input device 606 communicates with the processor 601 and can receive user input in a variety of ways.
  • the input device 606 may be a mouse, a keyboard, a touch screen device, a sensor device, or the like.
  • the service type may also be referred to as a service mode or transmission type, which is described here in a unified manner, and will not be repeated in the following embodiments.
  • a communication method provided in an embodiment of this application includes the following steps:
  • the second terminal device sends an SCI to the first terminal device.
  • the first terminal device receives the SCI from the second terminal device.
  • the SCI may be the first SCI, that is, the SCI includes the source identifier and/or the target identifier; it may also be the second SCI, that is, the SCI does not include the source identifier and the target identifier,
  • the source identifier indicates the terminal device that sends the IoV service data
  • the target identifier indicates the terminal device that receives the IoV service data
  • the type of the target identifier may be the identifier of the target terminal device, or may be the identifier of the target group, or may also For the identification of the target service, the embodiment of this application does not specifically limit this.
  • the source identifier and/or target identifier in the embodiment of the present application may be a complete identifier, or may be part of bits in a complete identifier.
  • the source identifier or the target identifier is carried in the first SCI by carrying identifiers in different fields in the first SCI.
  • it may be in the first field of the first SCI.
  • Carry the source identifier the first field may be called the source field
  • the second field in the first SCI carries the target identifier
  • the second target identifier may be called the target field
  • the first field and the second field are the first Different fields in SCI.
  • other methods can also be used to distinguish whether the identifier carried in the first SCI is a source identifier or a target identifier, which is not specifically limited in the embodiment of the present application.
  • the lengths of the foregoing first SCI and the second SCI may be the same or different, which is not specifically limited in the embodiment of the present application.
  • the above two SCIs have the same length, and both are the number of bits occupied by the first SCI. In this scenario, there are bits that do not carry any information in the second SCI (or can be understood as padding bits); or, the above two The length of each SCI is different, the length of the first SCI is length 1, and the length of the second SCI is length 2.
  • the lengths of the first SCI including the source identifier or the target identifier and the first SCI including the source identifier and the target identifier may be the same or different, which is not specifically limited in the embodiment of the present application.
  • the second terminal device sends a transmission block TB to the first terminal device.
  • the first terminal device receives the TB from the second terminal device.
  • the TB includes a layer 2 packet data unit PDU.
  • the MAC layer of the first terminal device can decode the TB to obtain the layer 2 PDU, which is not specifically limited in the embodiment of the present application.
  • layer 2 in the embodiments of the present application may include, for example, a MAC layer, a radio link control (radio link control, RLC) layer, and a packet data convergence protocol (packet data convergence protocol, PDCP) layer.
  • the layer 2 PDU may be a MAC PDU, or may be an RLC PDU, or may be a PDCP PDU, which is not specifically limited in the embodiment of the present application.
  • the SCI includes the first source identifier, and the layer 2 PDU does not include the layer 2 source identifier.
  • SCI is the first SCI.
  • the first source identifier is a layer 2 source identifier.
  • the layer 2 source identifier can be a 24-bit identifier, such as 00000000 00001101 11001001; or, the first source identifier is a physical layer source identifier, for example ,
  • the physical layer source identifier can be an 8-bit identifier, such as 10110001.
  • the physical layer source identifier may also be an identifier generated based on the layer 2 source identifier.
  • some bits in the layer 2 source identifier may be transformed or combined with other identification information to obtain the physical layer source identifier
  • the specific method for generating the physical layer source identifier according to the layer 2 source identifier is not specifically limited in the embodiment of the present application.
  • Case 2 The first target identifier is included in the SCI, and the layer 2 target identifier is not included in the layer 2 PDU.
  • the SCI is the first SCI.
  • the first target identifier is a layer 2 target identifier.
  • the layer 2 target identifier can be a 24-bit identifier, such as 00001000 00010011 01010011; or, the first target identifier is a physical layer target identifier, for example ,
  • the physical layer target identifier can be an 8-bit identifier, such as 00111000.
  • the physical layer target identifier may also be an identifier generated according to the layer 2 target identifier.
  • some bits in the layer 2 target identifier may be transformed or combined with other identification information to obtain the physical layer target identifier
  • the specific method for generating the physical layer target identifier according to the layer 2 target identifier is not specifically limited in the embodiment of the present application.
  • the first terminal device may determine the service type corresponding to the TB according to the first target identifier, where the service type includes unicast, multicast, and broadcast.
  • the first terminal device may decode the SCI to obtain the content of the first target identifier.
  • the content of the first target identifier may reflect the service type corresponding to the TB.
  • the first target identifier is When the target terminal device is identified, the service type may be a unicast service; or, when the first target identifier is a target group identifier, the service type may be a multicast service; or, when the first target identifier is a target service identifier , The service type may be a broadcast service.
  • the terminal devices in the IoV system can publish different services, and each service corresponds to a different service ID. Accordingly, each terminal device can subscribe to other terminal devices through the service ID Different services published.
  • service type corresponding to the TB in the embodiment of the present application can also be described as the service type corresponding to the layer 2 PDU included in the TB, which is explained here in a unified manner, and will not be repeated hereafter.
  • Case 3 The SCI includes the second source identifier, and the layer 2 PDU includes the third source identifier.
  • the SCI is the first SCI.
  • the second source identifier is the first bit in the layer 2 source identifier, and the third source identifier is other bits in the layer 2 source identifier except the first bit.
  • the first bit may be N consecutive high bits in the layer 2 source identifier, or it may be M consecutive low bits in the layer 2 source identifier, where N and M are both positive Integer.
  • the layer 2 source identifier is 48 bits
  • the first bit may be the consecutive 16 high-bit bits in the layer 2 source identifier.
  • the third source identifier may be the layer 2 source identifier. 32 consecutive low-bit bits; or, the first bit may be the consecutive 32 low-bit bits in the layer 2 source identifier.
  • the third source identifier is the consecutive 16 high-bit bits in the layer 2 source identifier. Bits.
  • Case 4 The SCI includes the second target identifier, and the layer 2 PDU includes the third target identifier.
  • SCI is the first SCI.
  • the second target identifier is the second bit in the layer 2 target identifier, and the third target identifier is other bits in the layer 2 target identifier except the second bit.
  • the second bit may be consecutive P high bits in the layer 2 target identifier, or it may be Q consecutive low bits in the layer 2 target identifier, where P and Q are both positive Integer.
  • the layer 2 target identifier is 48 bits
  • the second bit may be the consecutive 16 high-bit bits in the layer 2 target identifier.
  • the third target identifier is the continuous in the layer 2 target identifier.
  • the second bit can be the consecutive 16 low bits in the layer 2 target ID, in this case, the third target ID is the 32 consecutive high bits in the layer 2 target ID Bit.
  • the first terminal device may determine the type of the foregoing third target identifier according to the second target identifier.
  • the first terminal device may determine the service type corresponding to the TB according to the second target identifier, and then determine the type of the third target identifier according to the service type corresponding to the TB.
  • the method for the first terminal device to determine the service type corresponding to the TB according to the second target identifier may refer to the method for the first terminal device to determine the service type corresponding to the TB according to the first target identifier in the second case above, which will not be repeated here.
  • the type of the third target identifier can be determined according to the service type.
  • the type of the third target identifier is the identifier of the target terminal device; or, if the service type corresponding to the TB is multicast, then the third target The type of the identifier is the target group identifier; or, if the service type corresponding to the TB is broadcast, the type of the third target identifier is the target service identifier.
  • Case 5 The SCI does not include the layer 2 source identifier and the layer 2 target identifier, and the layer 2 PDU includes the layer 2 source identifier and the layer 2 target identifier. In this case five, the SCI is the second SCI.
  • case 1 and case 2 that is, the SCI includes the first source identification and the first target identification, and the layer 2 PDU does not include the layer 2 source identification and the layer 2 target identification ;
  • case three and four at the same time that is, the SCI includes the second source identifier and the second target identifier, and the layer 2 PDU includes the third source identifier and the third target identifier.
  • the first terminal device may decode the SCI and determine according to the content in the SCI whether the layer 2 included in the TB includes the source identifier and/or target Identification; or, because the first terminal device may receive the SCI in the first and second SCI formats, the first terminal device may also determine whether the layer 2 included in the TB is included in the PDU according to the format of the SCI.
  • the source identifier and/or target identifier that is, the first terminal device can first determine the format of the received SCI, and then determine whether the layer 2 PDU includes the source identifier and/or target identifier according to the format of the SCI. Make specific restrictions.
  • the first terminal device determines that the SCI is the first SCI, and the layer 2 PDU does not include the above layer 2 source identifier.
  • the SCI includes the first target identifier
  • the first terminal device determines that the SCI is the first SCI
  • the layer 2 PDU does not include the layer 2 target identifier.
  • the SCI includes the second source identifier
  • the first terminal device determines that the SCI is the first SCI, and the layer 2 PDU includes the third source identifier.
  • the first terminal device determines that the SCI is the first SCI, and the layer 2 PDU includes the third target identifier.
  • the first terminal device determines that the SCI is the second SCI, and the layer 2 ODU includes the layer 2 source identifier and the layer 2 target identifier.
  • the SCI includes the first source identifier, and the layer 2 PDU does not include the layer 2 source identifier; or, the SCI includes the first target identifier, and the layer 2 PDU does not include the layer 2 target identifier; or , The SCI includes the second source identifier, and the layer 2 PDU includes the third source identifier, where the second source identifier and the third source identifier are part of the layer 2 source identifier; or, the SCI includes the second target identifier, The layer 2 PDU includes the third target identifier, where the second target identifier and the third target identifier are part of the bit in the layer 2 target identifier, which avoids carrying redundant identification information in the layer 2 PDU and reduces data redundancy , Thereby reducing the overhead of layer 2 PDU.
  • the actions of the first terminal device in the above steps S701 to S702 may be called by the processor 601 in the terminal device 60 shown in FIG. 6 to call the application program code stored in the memory 603 to instruct the terminal device to execute. There are no restrictions.
  • the types of target identifiers carried in the MAC PDU included in the TB are the same.
  • the MAC PDU corresponds to the service type of unicast.
  • the type of target identifier carried in the MAC PDU corresponding to each service type is also different. Therefore, in NR IoV communication, how to distinguish the service type corresponding to the MAC PDU and the MAC PDU carried The type of target identification is a problem that needs to be solved urgently.
  • an embodiment of the present application provides a communication method.
  • the communication method includes the following steps:
  • the second terminal device sends a transmission block TB to the first terminal device.
  • the first terminal device receives the TB from the second terminal device.
  • the TB includes MAC PDU.
  • the MAC layer of the first terminal device can decode the TB to obtain the MAC PDU, which is not specifically limited in the embodiment of the present application.
  • the first terminal device obtains first information.
  • the first information may include one or more of HARQ process information, information about the V field in the MAC PDU header, dedicated bit indication information, and information about the transmission channel of the above TB.
  • the first information is used to indicate the information in the MAC PDU The type of the target identifier carried, or the first information is used to indicate the service type corresponding to the MAC PDU, or the first information is used to indicate that the MAC PDU carries the source identifier and/or the target identifier, or, The first information is used to indicate that the source identifier and/or target identifier are not carried in the MAC PDU.
  • the first terminal device determines, according to the first information, the type of the target identifier carried in the MAC PDU, or the service type corresponding to the MAC PDU, or whether the MAC PDU carries the source identifier and/or the target identifier.
  • the first terminal device may determine the MAC according to HARQ process information, information in the V field in the MAC PDU header, dedicated bit indication information, and information about the transmission channel of the TB above, or a combination of multiple information.
  • the service type corresponding to the PDU or determine the target identifier type carried in the MAC PDU, or determine whether the MAC PDU carries the source identifier and/or the target identifier.
  • the HARQ process information when the first information is HARQ process information, may be the HARQ process category to which the corresponding HARQ process number when the first terminal device receives the TB; or, the HARQ process The information may be the HARQ process number corresponding to the first terminal device when the TB is received, and the HARQ process category to which the HARQ process belongs can be determined according to the HARQ process number.
  • the service type corresponding to the TB is different, and the HARQ process type corresponding to the TB is different when the TB is received. Therefore, different HARQ information can indicate the service type corresponding to different MAC PDUs or the target identifier carried in the MAC PDU.
  • Type or whether the MAC PDU carries the source identifier and/or target identifier that is, different HARQ process information can be used to indicate the service type corresponding to the MAC PDU, or different HARQ process information can be used to indicate the type of target identifier carried by the MAC PDU, or use Different HARQ information indicates whether the source and/or target identifier is carried in the MAC PDU.
  • the HARQ process information is used to indicate the service type corresponding to the MAC PDU, or the HARQ process information is used to indicate the type of the target identifier carried in the MAC PDU
  • the HARQ process information is the first HARQ process information
  • the first The terminal device determines that the service type is unicast, or the type of the target identifier is the identifier of the target terminal device; or, if the HARQ process information is the second HARQ process information, the first terminal device determines that the service type is multicast, Alternatively, the type of the target identifier is a target group identifier; or, if the HARQ process information is the third HARQ process information, the first terminal device determines that the service type is broadcast, or the type of the target identifier is a target service identifier.
  • the first HARQ process information may be HARQ process category 1, or the first HARQ information may indicate that the process number of the above HARQ process is 1, and the HARQ process with process number 1 belongs to HAQR process category 1.
  • the first terminal device may determine that the service type is unicast, or the type of the target identification is the identification of the target terminal device; the second HARQ process information may be HARQ process category 2, or the second HARQ information may indicate the status of the HARQ process The process number is 2, and the HARQ process with process number 2 belongs to HAQR process category 2.
  • the first terminal device can determine that the service type is multicast, or the type of the target identifier is the target group identifier; the third HARQ process The information may be HARQ process category 3, or the third HARQ information may indicate that the process number of the HARQ process is 3, and the HARQ process with process number 3 belongs to the HAQR process category 3.
  • the first terminal device can determine the above service The type is broadcast, or the type of the target identifier is the target service identifier.
  • the first terminal device may determine that the MAC PDU carries the target identifier; Or, if the HARQ process information is the second HARQ process information, the first terminal device may determine that the MAC PDU carries the source identifier; or, if the HARQ process information is the third HARQ process information, the first terminal device may determine that the MAC PDU contains Carry the source identifier and the target identifier; or, if the HARQ process information is the fourth HARQ process information, the first terminal device may determine that the MAC PDU does not carry the source identifier and the target identifier; or, if the HARQ process information is the fifth HARQ process Information, the first terminal device may determine that the MAC PDU does not carry the target identifier; or, if the HARQ process information is the fifth HARQ process Information, the first terminal device may determine that the MAC PDU does not carry the target identifier; or, if the HARQ process information is the fifth HARQ process Information, the first terminal device
  • the HARQ process information may explicitly indicate the type of the target identifier carried in the MAC PDU or whether the MAC PDU carries the source identifier and/or the target identifier through the above method.
  • the HARQ process information may only indicate the service type corresponding to the MAC PDU, and indirectly indicate the type of target identifier carried in the MAC PDU through the service type corresponding to the MAC PDU, that is, the HARQ process information indicates the service type corresponding to the MAC PDU and the MAC PDU
  • the type of the target identifier carried, or the MAC PDU corresponding service type indirectly indicates whether the MAC PDU carries the source identifier and/or the target identifier, that is, the HARQ process information indicates the MAC PDU corresponding service type and whether the MAC PDU carries the source identifier and / Or target identification.
  • the unicast service type may indicate that the type of the target identifier carried in the MAC PDU is the identifier of the target terminal device, or the unicast service type may Indicates that the source identifier and/or target identifier are carried in the MAC PDU.
  • the multicast service type may indicate that the type of the target identifier carried in the MAC PDU is the target group identifier, or the multicast service type may indicate that the MAC PDU is Carry source identification and/or target identification.
  • the broadcast service type may indicate that the type of the target identifier carried in the MAC PDU is the target service identifier, or the broadcast service type may indicate that the MAC PDU does not carry the source Identification and/or target identification.
  • the unicast service type may indicate that the MAC PDU does not carry the source identifier and/or the target identifier;
  • the multicast service type may indicate that the MAC PDU does not carry the source identifier and/or target identifier; or, the HARQ information indicates that the service type corresponding to the MAC PDU is
  • the broadcast service type can indicate that the source identifier and/or target identifier are carried in the MAC PDU.
  • the V field in the MAC PDU header may be the V field in the SL-SCH subheader.
  • different values of the V field may be used to indicate the service type corresponding to the MAC PDU, or different values of the V field may be used to indicate whether the MAC PDU carries the source identifier and/or target identifier, or use Different values of the V field indicate the type of target identifier carried in the MAC PDU.
  • the type of target identifier carried in the MAC PDU can be indicated by the service type corresponding to the MAC PDU.
  • the first terminal device determines that the service type corresponding to the MAC PDU is unicast, or the type of the target identifier carried in the MAC PDU is the identifier of the target terminal device; or, if the V field in the MAC PDU header is second
  • the first terminal device determines that the service type corresponding to the MAC PDU is multicast, or the type of the target identifier carried in the MAC PDU is the target group identifier; or, if the V field in the MAC PDU header is the third value
  • the first terminal device determines that the service type corresponding to the MAC PDU is broadcast, or the type of the target identifier carried in the MAC PDU is the target service identifier.
  • the first value may be "1111".
  • the first terminal device determines that the service type corresponding to the MAC PDU is unicast, or in the MAC PDU
  • the type of the target identifier carried is the identifier of the target terminal device; the second value can be "0011", at this time, the first terminal device determines that the service type corresponding to the MAC PDU is multicast, or the target carried in the MAC PDU
  • the type of the identifier is the target group identifier; the third value can be "0000".
  • the first terminal device determines that the service type corresponding to the MAC PDU is broadcast, or the type of the target identifier carried in the MAC PDU is the target service Logo.
  • the length of the V field and the service types indicated by different values are just exemplary descriptions of the embodiments of the present application, and in actual applications, the embodiments of the present application do not specifically limit this.
  • the first terminal device may determine that the MAC PDU carries Target identifier; or, if the value of the V field is the second value, the first terminal device may determine that the MAC PDU carries the source identifier; or, if the value of the V field is the third value, the first terminal device It may be determined that the source identifier and the target identifier are carried in the MAC PDU; or, if the value of the V field is the fourth value, the first terminal device may determine that the source identifier and the target identifier are not carried in the MAC PDU; or, if the V field is The value of is the fifth value, the first terminal device may determine that the MAC PDU does not carry the target identifier; or, if the value of the V field is the sixth value, the first terminal device may determine that the MAC PDU does
  • the value of the V field can explicitly indicate the type of the target identifier carried in the MAC PDU or whether the MAC PDU carries the source identifier and/or the target identifier through the above method.
  • the value of the V field can also only indicate the service type corresponding to the MAC PDU, and the service type corresponding to the MAC PDU indirectly indicates the type of the target identifier carried in the MAC PDU, that is, the value of the V field indicates the service type corresponding to the MAC PDU
  • the type of the target identifier carried in the MAC PDU or indirectly indicates whether the source identifier and/or target identifier are carried in the MAC PDU through the service type corresponding to the MAC PDU, that is, the value of the V field indicates the service type and MAC PDU corresponding to the MAC PDU Whether to carry the source identifier and/or target identifier.
  • the unicast service type may indicate that the type of the target identifier carried in the MAC PDU is the identifier of the target terminal device, or the unicast service The type may indicate that the source identifier and/or target identifier are carried in the MAC PDU.
  • the multicast service type may indicate that the type of target identifier carried in the MAC PDU is the target group identifier, or the multicast service type may indicate MAC The source identifier and/or target identifier are carried in the PDU.
  • the broadcast service type may indicate that the type of target identifier carried in the MAC PDU is the target service identifier, or the broadcast service type may indicate that the MAC PDU is not Carry source identification and/or target identification.
  • the unicast service type may indicate that the MAC PDU does not carry the source identifier and/or target
  • the value of the V field indicates that the MAC PDU corresponds to the service type of multicast
  • the multicast service type may indicate that the MAC PDU does not carry the source ID and/or target ID; or, the value of the V field indicates the MAC
  • the broadcast service type may indicate that the source identifier and/or target identifier are carried in the MAC PDU.
  • the dedicated bit indication information may indicate the value of the first N bits in the MAC PDU header, where N is a positive integer, and the MAC PDU header It can be an SL-SCH subheader.
  • the dedicated bit indication information may explicitly indicate the value of the first N bits in the MAC PDU header.
  • the dedicated bit indication information may be that the value of the first 3 bits in the MAC PDU header is "010"; or
  • the dedicated bit indication information can implicitly indicate the value of the first N bits in the MAC PDU header, which is not specifically limited in the embodiment of the present application.
  • the different values of the first N bits in the MAC PDU header can be used to indicate the service type corresponding to the MAC PDU, or the different values of the first N bits in the MAC PDU header can be used to indicate the information carried in the MAC PDU
  • the type of the target identifier, or the different values of the first N bits in the MAC PDU header are used to indicate whether the MAC PDU carries the source identifier and/or the target identifier. It should be noted that the embodiment of the present application does not specifically limit the value of N.
  • the dedicated bit indicator information is used to indicate the service type corresponding to the MAC PDU, or the dedicated bit indicator information is used to indicate the type of the target identifier carried in the MAC PDU, if the dedicated bit indicator information indicates the MAC PDU header
  • the first N bits are the fourth value.
  • the first terminal device determines that the service type corresponding to the MAC PDU is unicast, or the type of target identifier carried in the MAC PDU is the identifier of the target terminal device; or, if the dedicated bit indicates The first N bits in the MAC PDU header indicated by the information are the fifth value, or the first terminal device determines that the service type corresponding to the MAC PDU is multicast, and the type of target identifier carried in the MAC PDU is the target group identifier; or, If the first N bits in the MAC PDU header indicated by the dedicated bit indication information are the sixth value, the first terminal device determines that the service type corresponding to the MAC PDU is broadcast, or the type of target identifier carried in the MAC PDU is target service logo.
  • N is 2, that is, the above-mentioned dedicated bit indication information indicates the value of the first two bits in the MAC PDU header.
  • the fourth value may be "00".
  • the service type corresponding to the MAC PDU It is unicast, or the type of the target identifier carried in the MAC PDU is the identifier of the target terminal device;
  • the fifth value can be "01", at this time, the service type corresponding to the MAC PDU is multicast, or MAC PDU
  • the type of the target identifier carried in the PDU is the target group identifier;
  • the sixth value can be "10", at this time, the service type corresponding to the MAC PDU is broadcast, or the type of the target identifier carried in the MAC PDU is the target service identifier .
  • the foregoing value of N and the service type indicated by the different values of the first N bits in the MAC PDU header are only exemplary descriptions of the embodiments of the present application, and in actual applications, the embodiments of the present
  • the first terminal device may determine that the MAC PDU carries the target identifier; or, if the first N bits in the MAC PDU header indicated by the dedicated bit indication information are the second value, the first terminal device may determine that the MAC PDU carries the source identifier; or, If the first N bits in the MAC PDU header indicated by the dedicated bit indication information are the third value, the first terminal device may determine that the MAC PDU carries the source identifier and the target identifier; or, if the dedicated bit indication information indicates the MAC PDU The first N bits in the header are the fourth value, and the first terminal device may determine that the MAC PDU does not carry the source identifier and target identifier; or, if the first N bits in the MAC PDU header indicated by the dedicated bit indication
  • N is 3, that is, the above-mentioned dedicated bit indication information indicates the value of the first three bits in the MAC PDU header.
  • the first value can be "001”.
  • the MAC PDU carries the target identifier ;
  • the second value can be "010”, at this time, the MAC PDU carries the source identifier;
  • the third value can be "011”, at this time, the MAC PDU carries the source identifier and the target identifier;
  • the fourth value The value can be "100".
  • the MAC PDU does not carry the target ID and source ID; the fifth value can be "101", at this time, the MAC PDU does not carry the target ID; the sixth value can be "110", at this time, the source identifier is not carried in the MAC PDU.
  • the dedicated bit indication information may explicitly indicate the type of the target identifier carried in the MAC PDU or whether the MAC PDU carries the source identifier and/or the target identifier through the above method.
  • the dedicated bit indication information may only indicate the service type corresponding to the MAC PDU, and indirectly indicate the type of target identifier carried in the MAC PDU through the service type corresponding to the MAC PDU, that is, the dedicated bit indication information indicates the service type and MAC corresponding to the MAC PDU.
  • the unicast service type may indicate that the type of the target identifier carried in the MAC PDU is the identifier of the target terminal device, or the unicast service type It may indicate that the source identifier and/or target identifier are carried in the MAC PDU.
  • the dedicated bit indication information indicates that the service type corresponding to the MAC PDU is multicast
  • the multicast service type may indicate that the type of the target identifier carried in the MAC PDU is the target group identifier, or the multicast service type may indicate the MAC PDU Carrying the source identifier and/or target identifier.
  • the broadcast service type may indicate that the type of the target identifier carried in the MAC PDU is the target service identifier, or the broadcast service type may indicate that the MAC PDU does not carry Source identification and/or target identification.
  • the unicast service type may indicate that the MAC PDU does not carry the source identifier and/or target identifier
  • the multicast service type may indicate that the MAC PDU does not carry the source identifier and/or target identifier; or, the dedicated bit indication information indicates that the MAC PDU corresponds to
  • the broadcast service type may indicate that the source identifier and/or target identifier are carried in the MAC PDU.
  • the dedicated bit indication information may indicate the Ath to Bth consecutive ones in the MAC PDU header (N in total, N is a positive integer)
  • the value of the bit, the MAC PDU header may be an SL-SCH sub-header.
  • the dedicated bit indication information can explicitly indicate the value of the Ath to Bth consecutive (N total) bits in the MAC PDU header.
  • the dedicated bit indication information may be the third bit in the MAC PDU header.
  • the value of the 4th to the 6th consecutive 4 bits is "0110"; or, the dedicated bit indication information can also implicitly indicate the Ath to Bth consecutive (N total) bits in the MAC PDU header.
  • the value of the bit position is not specifically limited in the embodiment of this application.
  • the different values of the Ath to Bth consecutive (N total) bits in the MAC PDU header can be used to indicate the service type corresponding to the MAC PDU, or the target identifier carried in the MAC PDU Or whether the MAC PDU carries the source identifier and/or target identifier.
  • the dedicated bit indication information may indicate the reserved bits of the SL-SCH subheader in the MAC PDU header shown in FIG. 2 or FIG. 3 ( The value of the first N bits in R), where N is a positive integer.
  • the dedicated bit indication information may explicitly indicate the value of the first N bits in the reserved bits.
  • the dedicated bit indication information may be that the value of the first 2 bits in the reserved bits is "01".
  • the dedicated bit indication information may also implicitly indicate the value of the first N bits in the reserved bits, which is not specifically limited in the embodiment of the present application.
  • the different values of the first N bits in the above reserved bits can be used to indicate the service type corresponding to the MAC PDU, or the type of target identifier carried in the MAC PDU, or whether the MAC PDU carries the source identifier And/or target identification.
  • the first terminal device when the first information is the information of the transmission channel of the aforementioned TB, as shown in FIG. 9, the first terminal device includes a physical protocol layer (hereinafter referred to as a physical layer) and a MAC protocol layer ( (Hereinafter referred to as the MAC layer), after the physical layer receives the TB from the second terminal device, the MAC layer receives the TB from the physical layer.
  • the transmission channel information of the TB refers to the transmission channel information when the MAC layer of the first terminal device receives the TB from the physical layer.
  • different transmission channel information can be used to indicate the service type corresponding to the MAC PDU, or different transmission channel information can be used to indicate whether the MAC PDU carries the source identifier and/or target identifier, or use different transmission channels
  • the information indicates the type of target identifier carried in the MAC PDU.
  • the type of target identifier carried in the MAC PDU can be indicated by the service type corresponding to the MAC PDU.
  • the transmission channel information of the TB is used to indicate the service type corresponding to the MAC PDU, or the transmission channel information of the TB is used to indicate the type of the target identifier carried in the MAC PDU, if the transmission channel of the TB is a side chain Unicast transmission channel, that is, the MAC layer of the first terminal device receives the TB via the side link unicast transmission channel.
  • the first terminal device determines that the service type corresponding to the MAC PDU is unicast, or MAC PDU
  • the type of the target identifier carried in the TB is the identifier of the target terminal device; or, the transmission channel of the TB is a side link multicast transmission channel, that is, the MAC layer of the first terminal device receives it via the side link multicast transmission channel
  • the first terminal device determines that the service type corresponding to the MAC PDU is multicast, or the type of the target identifier carried in the MAC PDU is the target group identifier; or, the transmission channel of the TB is side link broadcast Transmission channel, that is, the MAC layer of the first terminal device receives the TB via the sidelink broadcast transmission channel.
  • the first terminal device determines that the service type corresponding to the MAC PDU is broadcast, or the target identifier carried in the MAC PDU The type is the target service identifier.
  • the first terminal device may determine the MAC PDU The target identifier is carried in the TB; or, if the transmission channel information of the TB is the second transmission channel information, the first terminal device may determine that the MAC PDU carries the source identifier; or, if the transmission channel information of the TB is the third transmission channel Information, the first terminal device may determine that the source identifier and target identifier are carried in the MAC PDU; or, if the transmission channel information of the TB is the fourth transmission channel information, the first terminal device may determine that the MAC PDU does not carry the source identifier and target identifier Identification; or, if the transmission channel information of the TB is the fifth transmission channel information, the first terminal device may determine that the MAC PDU does not carry the target identifier; or, if the transmission channel information of the TB is the fifth transmission channel information, the first terminal device may determine that the MAC PDU does not carry the target identifier; or, if the transmission channel information of the TB is the fifth transmission channel information, the first
  • the transmission channel information of the TB may explicitly indicate the type of the target identifier carried in the MAC PDU or whether the MAC PDU carries the source identifier and/or the target identifier through the above method.
  • the transmission channel information of the TB can also only indicate the service type corresponding to the MAC PDU, and the service type corresponding to the MAC PDU indirectly indicates the type of target identifier carried in the MAC PDU, that is, the transmission channel information of the TB indicates the service type corresponding to the MAC PDU
  • the type of target identifier carried in the MAC PDU or indirectly indicate whether the source identifier and/or target identifier are carried in the MAC PDU through the service type corresponding to the MAC PDU, that is, the transmission channel information of the TB indicates the service type and MAC PDU corresponding to the MAC PDU Whether to carry the source identifier and/or target identifier.
  • the unicast service type may indicate that the type of the target identifier carried in the MAC PDU is the identifier of the target terminal device, or the unicast service The type may indicate that the source identifier and/or target identifier are carried in the MAC PDU.
  • the transmission channel information of the TB indicates that the service type corresponding to the MAC PDU is multicast
  • the multicast service type may indicate that the type of the target identifier carried in the MAC PDU is the target group identifier, or the multicast service type may indicate the MAC The source identifier and/or target identifier are carried in the PDU.
  • the broadcast service type may indicate that the type of the target identifier carried in the MAC PDU is the target service identifier, or the broadcast service type may indicate that the MAC PDU does not Carry source identification and/or target identification.
  • the unicast service type may indicate that the MAC PDU does not carry the source identifier and/or target ID; or, when the transmission channel information of the TB indicates that the service type corresponding to the MAC PDU is multicast, the multicast service type may indicate that the source ID and/or target ID are not carried in the MAC PDU; or, the transmission channel information of the TB indicates the MAC
  • the broadcast service type may indicate that the source identifier and/or target identifier are carried in the MAC PDU.
  • the MAC PDU when the service type corresponding to the MAC PDU indicated by the first information is broadcast, the MAC PDU may not carry the target identifier. In this case, the first information does not indicate that the MAC PDU carries The type of target ID.
  • the type of the target identifier may be explicitly indicated.
  • the first information is HARQ process information
  • the HARQ process information may explicitly indicate that the type of the target identifier is the identifier of the target terminal device; or, the first information may also implicitly indicate the type of the target identifier, for example, the first information is HARQ process information, and the HARQ process
  • the information may indicate the service type of the MAC PDU, and indirectly indicate the type of the target identifier according to the service type of the MAC PDU.
  • the first terminal device can obtain first information, which can include HARQ process information, information about the V field in the MAC PDU header, dedicated bit indication information, and information about the transmission channel of the TB.
  • the first information indicates the service type corresponding to the MAC PDU in the TB received by the first terminal device, or the first information indicates the type of the target identifier carried in the MAC PDU, or the first information indicates whether the MAC PDU is carried
  • the source identification and/or target identification can distinguish the service type corresponding to the MAC PDU and/or the format of the MAC PDU, so that the first terminal device can perform corresponding subsequent processing according to different service types and/or the format of the MAC PDU .
  • the actions of the first terminal device in the above steps S801 to S803 can be called by the processor 601 in the terminal device 60 shown in FIG. 6 to call the application program code stored in the memory 603 to instruct the terminal device to execute. There are no restrictions.
  • the methods and/or steps implemented by the terminal device can also be implemented by components (such as chips or circuits) that can be used in the terminal device. .
  • an embodiment of the present application also provides a communication device, which is used to implement the foregoing various methods.
  • the communication device may be the terminal device (including the first terminal device and the second terminal device) in the foregoing method embodiment, or a device including the foregoing terminal device, or a component that can be used for a terminal device. It can be understood that, in order to realize the above-mentioned functions, the communication device includes hardware structures and/or software modules corresponding to each function.
  • the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software-driven hardware depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.
  • the embodiments of the present application may divide the communication device into functional modules according to the foregoing method embodiments.
  • each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module.
  • the above-mentioned integrated modules can be implemented in the form of hardware or software functional modules. It should be noted that the division of modules in the embodiments of the present application is illustrative, and is only a logical function division, and there may be other division methods in actual implementation.
  • FIG. 10 shows a schematic structural diagram of a first terminal device 100.
  • the terminal device 100 includes a processing module 1001 and a transceiver module 1002.
  • the transceiver module 1002 may also be referred to as a transceiver unit to implement sending and/or receiving functions, for example, it may be a transceiver circuit, transceiver, transceiver or communication interface.
  • the processing module 1001 is configured to receive the side link control information SCI from the second terminal device through the transceiver module 1002; the processing module 1001 is also configured to receive from the second terminal device through the transceiver module 1002 The transmission block TB of the terminal device, where the TB includes layer 2 PDU.
  • the processing module 1001 is further configured to determine the service type corresponding to the TB according to the first target identifier.
  • the processing module 1001 is further configured to determine the type of the third target identifier according to the second target identifier.
  • the processing module 1001 is further configured to determine the type of the third target identifier according to the second target identifier, including: the processing module 1001 is further configured to determine the third target identifier as the service type corresponding to the TB is unicast
  • the type of is the identifier of the target terminal device; or, the processing module 1001 is also used for the service type corresponding to the above TB is multicast, and the type of the third target identifier is determined as the target group identifier; or, the processing module 1001 also uses The service type corresponding to the aforementioned TB is broadcast, and the type of the third target identifier is determined to be the target service identifier.
  • the processing module 1001 is configured to receive the transmission block TB from the second terminal device through the transceiver module 1002, where the TB includes MAC PDU.
  • the processing module 1001 is further configured to obtain first information, where the first information includes one of the following information: HARQ process information, information about the V field in the MAC PDU header, dedicated bit indication information, and information about the transmission channel of the above TB Information; the first information is used to indicate the type of the target identifier carried in the MAC PDU, or the first information is used to indicate the service type corresponding to the MAC PDU, or the first information is used to indicate the MAC PDU carries The source identifier and/or target identifier, or the first information is used to indicate that the source identifier and/or target identifier are not carried in the MAC PDU.
  • the first information includes one of the following information: HARQ process information, information about the V field in the MAC PDU header, dedicated bit indication information, and information about the transmission channel of the above TB Information; the first information is used to indicate the type of the target identifier carried in the MAC PDU, or the first information is used to indicate the service type corresponding to the MAC PDU
  • the processing module 1001 is also used to determine the type of target identifier carried by the MAC PDU, or the service type corresponding to the MAC PDU, or whether the MAC PDU carries the source identifier and/or the target identifier.
  • the processing module 1001 is used to receive the above information or message through the transceiver module 1002. It can be understood that the transceiver module 1002 receives the signal carrying the above information or message sent by the outside world, and then sends it to the processing module with or without signal processing. 1001 processing. This is a unified description, and will not be repeated here.
  • the first terminal device 100 is presented in the form of dividing various functional modules in an integrated manner.
  • the "module” here can refer to a specific ASIC, circuit, processor and memory that executes one or more software or firmware programs, integrated logic circuit, and/or other devices that can provide the above-mentioned functions.
  • the first terminal device 100 may take the form of the terminal device 60 shown in FIG. 6.
  • the processor 601 in the terminal device 60 shown in FIG. 6 may invoke the computer execution instruction stored in the memory 603 to make the terminal device 60 execute the communication method in the foregoing method embodiment.
  • the functions/implementation process of the processing module 1001 and the transceiver module 1002 in FIG. 10 may be implemented by the processor 601 in the terminal device 60 shown in FIG. 6 calling a computer execution instruction stored in the memory 603.
  • the function/implementation process of the processing module 1001 in FIG. 10 can be implemented by the processor 601 in the terminal device 60 shown in FIG. 6 calling a computer execution instruction stored in the memory 603, and the function of the transceiver module 1002 in FIG. /The implementation process can be implemented through the communication interface 604 in the terminal device 60 shown in FIG. 6.
  • the first terminal device 100 provided in this embodiment can execute the above-mentioned communication method, the technical effects that can be obtained can refer to the above-mentioned method embodiment, which will not be repeated here.
  • an embodiment of the present application further provides a communication device.
  • the communication device may be the first terminal device in any of the foregoing method embodiments, such as a vehicle-mounted communication device, or a device including the foregoing first terminal device, For example, various types of vehicles, or a device included in the first terminal device, such as a system chip; or, the communication device may be the second terminal device in any of the foregoing method embodiments, such as a vehicle-mounted communication device, or A device including the above-mentioned second terminal device, such as various types of vehicles, or a device included in the above-mentioned second terminal device, such as a system chip.
  • the communication device includes a module, unit, or means corresponding to the foregoing method, and the module, unit, or means can be implemented by hardware, software, or hardware execution of corresponding software.
  • the hardware or software includes one or more modules or units corresponding to the above-mentioned functions.
  • an embodiment of the present application further provides a communication device, including: a processor and a memory; the memory is used to store computer instructions, and when the processor executes the instructions, the communication device can execute any of the above methods The method described in the embodiment.
  • the communication device may be the first terminal device in any of the foregoing method embodiments, such as an in-vehicle communication device, or a device including the foregoing first terminal device, such as various types of vehicles, or the foregoing first terminal device including
  • the communication device may be the second terminal device in any of the foregoing method embodiments, such as a vehicle-mounted communication device, or a device containing the foregoing second terminal device, such as various types of vehicles, Or a device included in the aforementioned second terminal device, such as a system chip.
  • an embodiment of the present application further provides a communication device, including: a processor; the processor is configured to couple with a memory, and after reading an instruction in the memory, execute any of the above-mentioned methods according to the instruction. The method described in the example.
  • the communication device may be the first terminal device in any of the foregoing method embodiments, such as a vehicle-mounted communication device, or a device including the foregoing first terminal device, such as various types of vehicles, or the foregoing first terminal device including
  • the communication device may be the second terminal device in any of the foregoing method embodiments, such as a vehicle-mounted communication device, or a device containing the foregoing second terminal device, such as various types of vehicles, Or a device included in the aforementioned second terminal device, such as a system chip.
  • the embodiment of the present invention also provides a computer-readable storage medium, the computer-readable storage medium stores instructions, and when the instructions run on a communication device, the communication device can execute any of the above methods The method described in the embodiment.
  • the communication device may be the first terminal device in any of the foregoing method embodiments, such as an in-vehicle communication device, or a device including the foregoing first terminal device, such as various types of vehicles, or the foregoing first terminal device including
  • the communication device may be the second terminal device in any of the foregoing method embodiments, such as a vehicle-mounted communication device, or a device containing the foregoing second terminal device, such as various types of vehicles, Or a device included in the aforementioned second terminal device, such as a system chip.
  • an embodiment of the present invention also provides a computer program product containing instructions, which when the instructions run on a communication device, enable the communication device to execute the method described in any of the foregoing method embodiments.
  • the communication device may be the first terminal device in any of the foregoing method embodiments, such as an in-vehicle communication device, or a device including the foregoing first terminal device, such as various types of vehicles, or the foregoing first terminal device including
  • the communication device may be the second terminal device in any of the foregoing method embodiments, such as a vehicle-mounted communication device, or a device containing the foregoing second terminal device, such as various types of vehicles, Or a device included in the aforementioned second terminal device, such as a system chip.
  • an embodiment of the present application further provides a communication device (for example, the communication device may be a chip or a chip system), and the communication device includes a processor for implementing the method in any of the foregoing method embodiments.
  • the communication device further includes a memory.
  • the memory is used to store necessary program instructions and data, and the processor can call the program code stored in the memory to instruct the communication device to execute the method in any of the foregoing method embodiments.
  • the memory may not be in the communication device.
  • the communication device is a chip system, it may be composed of a chip, or may include a chip and other discrete devices, which is not specifically limited in the embodiment of the present application.
  • an embodiment of the present invention further provides a communication system, which includes the first terminal device and the second terminal device in the foregoing method embodiment.
  • the computer may be implemented in whole or in part by software, hardware, firmware or any combination thereof.
  • a software program it may be implemented in the form of a computer program product in whole or in part.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium.
  • the computer instructions may be transmitted from a website, computer, server, or data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer, or may include one or more data storage devices such as servers and data centers that can be integrated with the medium.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)).
  • the computer may include the aforementioned device.

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Abstract

本申请实施例提供通信的方法、装置及系统，可应用于涉及车辆驾驶的系统，比如自动驾驶系统或IoV系统。该方法包括：第一终端设备接收来自第二终端设备的侧行链路控制信息SCI和传输块TB，其中，SCI中包括第一源标识，层2 PDU中不包括层2源标识；或者，SCI中包括第一目标标识，层2 PDU中不包括层2目标标识；或者，SCI中包括第二源标识，层2 PDU中包括第三源标识；或者，SCI中包括第二目标标识，层2 PDU中包括第三目标标识；或者，SCI中不包括层2源标识和层2目标标识，层2 PDU中包括层2源标识和层2目标标识。应用本申请实施例提供的上述通信方法可以减少数据冗余，从而降低层2 PDU的开销。

Description

通信的方法、装置及系统
本申请要求于2019年03月06日提交中国专利局、申请号为201910169370.0、申请名称为“通信的方法、装置及系统”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
本申请涉及通信领域，尤其涉及通信的方法、装置及系统。
背景技术
“车联网(internet of vehicles，IoV)”通信，即车与外界进行百分百的互联，进行数据传输和信息交互的无线通信技术，可用于无人驾驶(unmanned driving)、自动驾驶(automated driving)等领域。长期演进(long term evolution，LTE)IoV通信中，在物理侧行链路控制信道(pysical sidelink control channel，PSCCH)上传输侧行链路控制信息(sidelink control information，SCI)，该SCI包括侧行链路调度信息。该侧行链路调度信息例如可以包括资源分配信息、调制和编码方案以及每包的近距离优先级(ProSe per-packet priority，PPPP)等，该资源分配信息用于指示侧行链路共享信道(sidelink share channel，SL-SCH)上传输有传输块(transmission block，TB)，并提供与接收该TB相关的信息。该SCI还可能提供混合自动重传请求(Hybrid Automatic Repeat Request，HARQ)的相关信息，如重传指示、重传资源等。
在LET IoV通信中，终端设备的物理层在SCI信息中的资源分配信息所指示的时频位置接收到TB之后，媒体接入控制(Media Access Control，MAC)解码该TB得到媒体接入控制分组数据单元(MAC packet data unit，MAC PDU)，该MAC PDU的组成结构如图1所示，包括MAC头、媒体接入控制服务数据单元(MAC SDU)以及填充(padding)部分。其中，MAC头中包括SL-SCH子头，SL-SCH子头的格式如图2或图3所示。由图2或图3可以看出，在SL-SCH子头中包括V字段、SRC字段以及DST字段。其中，V字段的长度为4比特，表示SL-SCH的格式版本号。DST字段指示TB的接收端标识(也称为目标标识)，SRC字段的长度为24比特，指示TB的发送端标识(也称为源标识)。因此，在LTE V2X中，解码TB后得到的MAC PDU中始终携带有发送端标识和接收端标识。其中，在V字段的值为“0001”或“0010”时，如图2所示，DST字段的长度为16比特，该字段携带目标层2标识(destination layer-2 identification，Destination Layer-2 ID)中最重要的16个比特；或者，在V字段的值为“0011”时，如图3所示，DST字段的长度为24比特，该字段携带Destination Layer-2 ID。
然而，在新空口(new radio，NR)IoV通信中，允许在SCI中携带TB的发送端标识和/或接收端标识，此时，如果继续沿用LTE IoV通信中的数据格式，即在层2 PDU中包括上述发送端标识和接收端标识，则将引起数据冗余。因此，在NR IoV通信中，如何降低数据冗余，是目前亟待解决的问题。
发明内容
本申请实施例提供一种通信的方法、装置、系统，可以减少数据冗余，从而降低层2 PDU的开销。
为达到上述目的，本申请的实施例采用如下技术方案：
第一方面，提供了一种通信的方法及相应的通信装置。该方案中，第一终端设备接收来 自第二终端设备的的侧行链路控制信息SCI；该第一终端设备还接收来自该第二终端设备的传输块TB，该TB中包括层2 PDU。其中，该SCI中包括第一源标识，该层2 PDU中不包括层2源标识，该第一源标识为该层2源标识，或者该第一源标识为物理层源标识；或者，该SCI中包括第一目标标识，该层2 PDU中不包括层2目标标识，该第一目标标识为该层2目标标识，或者该第一目标标识为物理层目标标识；或者，该SCI中包括第二源标识，该层2 PDU中包括第三源标识，该第二源标识为该层2源标识中的第一比特位，该第三源标识为该层2源标识中除该第一比特位之外的其他比特位；或者，该SCI中包括第二目标标识，该层2 PDU中包括第三目标标识，其中，该第二目标标识为该层2目标标识中的第二比特位，该第三目标标识为该层2目标标识中除该第二比特位之外的其他比特位；或者，该SCI中不包括该层2源标识和该层2目标标识，该层2 PDU中包括该层2源标识和该层2目标标识。由于本申请实施例中，避免了在层2 PDU中携带冗余的标识信息，从而减少了数据冗余，降低了层2PDU的开销。
在一种可能的设计中，上述物理层源标识包括根据上述层2源标识生成的源标识；上述物理层目标标识包括根据上述层2目标标识生成的目标标识。由于本申请实施例中，在SCI中包括根据层2源标识生成的源标识和/或根据层2目标标识生成的目标标识，层2 PDU中不包括层2源标识和/或层2目标标识，避免了在层2 PDU中携带冗余的标识信息，从而减少了数据冗余，降低了层2 PDU的开销。
在一种可能的设计中，第一终端设备根据第一目标标识确定上述TB对应的业务类型。由于本申请实施例中，可以确定上述TB对应的业务类型，因此可以区分单播、组播和广播，从而使第一终端设备可以根据不同的业务类型进行相应的后续处理。
在一种可能的设计中，第一终端设备根据上述第二目标标识确定上述第三目标标识的类型。
在一种可能的设计中，第一终端设备根据上述第二目标标识确定上述第三目标标识的类型包括：该第一终端设备根据该第二目标标识，确定上述TB对应的业务类型；该第一终端设备根据该TB对应的业务类型，确定该第三目标标识的类型。
在一种可能的设计中，第一终端设备根据上述TB对应的业务类型，确定该第三目标标识的类型，包括：该TB对应的业务类型为单播，该第一终端设备确定该第三目标标识的类型为目标终端设备的标识；或者，该TB对应的业务类型为组播，该第一终端设备确定该第三目标标识的类型为目标组标识；或者，该TB对应的业务类型为广播，该第一终端设备确定该第三目标标识的类型为目标服务标识。由于本申请实施例中，可以确定第三目标标识的类型，因此可以根据该第三目标标识的类型区分不同的业务类型，从而使第一终端设备可以根据不同的业务类型进行相应的后续处理。此外，本申请实施例提供一种通信的方法、装置、系统，可以区分MAC PDU对应的业务类型，或者可以区分MAC PDU中携带的目标标识的类型，或者可以区分MAC PDU中是否携带源标识和/或目标标识，从而使第一终端设备可以根据不同的业务类型进行相应的后续处理。
为达到上述目的，本申请的实施例采用如下技术方案：
第二方面，提供了一种通信的方法及相应的通信装置。该方案中，第一终端设备接收来自第二终端设备的传输块TB，该TB中包括媒体接入控制分组数据单元MAC PDU；该第一终端设备获取第一信息，其中，该第一信息包括以下信息中的一种：混合自动重传请求HARQ进程信息、MAC PDU头中V字段的信息、专用比特指示信息、上述TB的传输信道的信息；该第一信息用于指示上述MAC PDU中携带的目标标识的类型，或者，该第一信息用于指示 该MAC PDU对应的业务类型，或者，该第一信息用于指示该MAC PDU中携带源标识和/或目标标识，或者，该第一信息用于指示所述MAC PDU中不携带源标识和/或目标标识。由于本申请实施例中，第一信息可以指示该MAC PDU中携带的目标标识的类型，或者该MAC PDU对应的业务类型，或者，该MAC PDU中携带目标标识和/或源标识，或者，该MAC PDU中不携带目标标识和/或源标识，因此，可以使第一终端设备根据不同的业务类型或目标标识的类型或MAC PDU中携带的内容进行相应的后续处理。
在一种可能的设计中，上述HARQ进程信息为第一HARQ进程信息，该目标标识的类型为目标终端设备的标识，和/或，该业务类型为单播；或者，该HARQ进程信息为第二HARQ进程信息，该目标标识的类型为目标组标识，和/或，该业务类型为组播；或者，该HARQ进程信息为第三HARQ进程信息，该目标标识的类型为目标服务标识，和/或，该业务类型为广播。由于本申请实施例中，HARQ进程信息可以指示该MAC PDU中携带的目标标识的类型，和/或该MAC PDU对应的业务类型，因此，可以使第一终端设备根据不同的业务类型和/或目标标识的类型进行相应的后续处理。
在一种可能的设计中，该HARQ进程信息为第一HARQ进程信息，该MAC PDU中携带该目标标识；或者，该HARQ进程信息为第二HARQ进程信息，该MAC PDU中携带该源标识；或者，该HARQ进程信息为第三HARQ进程信息，该MAC PDU中携带该源标识和该目标标识；或者，该HARQ进程信息为第四HARQ进程信息，该MAC PDU中不携带该源标识和该目标标识；或者，该HARQ进程信息为第五HARQ进程信息，该MAC PDU中不携带目标标识；或者，该HARQ进程信息为第六HARQ进程信息，该MAC PDU中不携带源标识。由于本申请实施例中，HARQ进程信息可以指示该MAC PDU中是否携带源标识和/或目标标识，因此，可以使第一终端设备根据MAC PDU中携带的内容进行相应的后续处理。
在一种可能的设计中，该HARQ进程信息指示MAC PDU对应的业务类型为单播时，该单播业务类型可以指示MAC PDU中携带源标识和/或目标标识；或者，HARQ进程信息指示MAC PDU对应的业务类型为组播时，该组播业务类型可以指示MAC PDU中携带源标识和/或目标标识；或者，HARQ进程信息指示MAC PDU对应的业务类型为广播时，该广播业务类型可以指示MAC PDU中不携带源标识和/或目标标识。
在一种可能的设计中，HARQ进程信息指示MAC PDU对应的业务类型为单播时，该单播业务类型可以指示MAC PDU中不携带源标识和/或目标标识；或者，HARQ进行信息指示MAC PDU对应的业务类型为组播时，该组播业务类型可以指示MAC PDU中不携带源标识和/或目标标识；或者，HARQ进行信息指示MAC PDU对应的业务类型为广播时，该广播业务类型可以指示MAC PDU中携带源标识和/或目标标识。
在一种可能的设计中，该MAC PDU头中V字段为第一取值，该目标标识的类型为目标终端设备的标识，和/或，该业务类型为单播；或者，该MAC PDU头中V字段为第二取值，该目标标识的类型为目标组标识，和/或，该业务类型为组播；或者，该MAC PDU头中V字段为第三取值，该目标标识的类型为目标服务标识，和/或，该业务类型为广播。由于本申请实施例中，MAC PDU头中V字段的信息可以指示该MAC PDU中携带的目标标识的类型，和/或该MAC PDU对应的业务类型，因此，可以使第一终端设备根据不同的业务类型和/或目标标识的类型进行相应的后续处理。
在一种可能的设计中，该MAC PDU头中V字段为第一取值，该MAC PDU中携带该目标标识；或者，该MAC PDU头中V字段为第二取值，该MAC PDU中携带该源标识；或者， 该MAC PDU头中V字段为第三取值，该MAC PDU中携带该源标识和该目标标识；或者，该MAC PDU头中V字段为第四取值，该MAC PDU中不携带该源标识和该目标标识；或者，该MAC PDU头中V字段为第五取值，该MAC PDU中不携带该目标标识；或者，该MAC PDU头中V字段为第六取值，该MAC PDU中不携带该源标识。由于本申请实施例中，HARQ进程信息可以指示该MAC PDU中是否携带源标识和/或目标标识，因此，可以使第一终端设备根据MAC PDU中携带的内容进行相应的后续处理。
在一种可能的设计中，V字段的取值指示MAC PDU对应的业务类型为单播时，该单播业务类型可以指示MAC PDU中携带源标识和/或目标标识；或者，V字段的取值指示MAC PDU对应的业务类型为组播时，该组播业务类型可以指示MAC PDU中携带源标识和/或目标标识；或者，V字段的取值指示MAC PDU对应的业务类型为广播时，该广播业务类型可以指示MAC PDU中不携带源标识和/或目标标识。
在一种可能的设计中，V字段的取值指示MAC PDU对应的业务类型为单播时，该单播业务类型可以指示MAC PDU中不携带源标识和/或目标标识；或者，V字段的取值指示MAC PDU对应的业务类型为组播时，该组播业务类型可以指示MAC PDU中不携带源标识和/或目标标识；或者，V字段的取值指示MAC PDU对应的业务类型为广播时，该广播业务类型可以指示MAC PDU中携带源标识和/或目标标识。
在一种可能的设计中，该专用比特指示信息指示的MAC PDU头中前N个比特为第四取值，该目标标识的类型为目标终端设备的标识，和/或，该业务类型为单播，其中，N为正整数；或者，该专用比特指示信息指示的MAC PDU头中前N个比特为第五取值，该目标标识的类型为目标组标识，和/或，该业务类型为组播；或者，该专用比特指示信息指示的MAC PDU头中前N个比特为第六取值，该目标标识的类型为目标服务标识，和/或，该业务类型为广播。由于本申请实施例中，专用比特指示信息可以指示该MAC PDU中携带的目标标识的类型和/或该MAC PDU对应的业务类型，因此，可以使第一终端设备根据不同的业务类型和/或目标标识的类型进行相应的后续处理。
在一种可能的设计中，该专用比特指示信息指示的MAC PDU头中前N个比特为第一取值，该MAC PDU中携带该目标标识，其中，N为正整数；或者，该专用比特指示信息指示的MAC PDU头中前N个比特为第二取值，该MAC PDU中携带该源标识；或者，该专用比特指示信息指示的MAC PDU头中前N个比特为第三取值，该MAC PDU中携带该源标识和该目标标识；或者，该专用比特指示信息指示的MAC PDU头中前N个比特为第四取值，该MAC PDU中不携带该源标识和该目标标识；或者，该专用比特指示信息指示的MAC PDU头中前N个比特为第五取值，该MAC PDU中不携带该目标标识，其中，N为正整数；或者，该专用比特指示信息指示的MAC PDU头中前N个比特为第六取值，该MAC PDU中不携带该源标识。由于本申请实施例中，HARQ进程信息可以指示该MAC PDU中是否携带源标识和/或目标标识，因此，可以使第一终端设备根据MAC PDU中携带的内容进行相应的后续处理。
在一种可能的设计中，专用比特指示信息指示MAC PDU对应的业务类型为单播时，该单播业务类型可以指示MAC PDU中携带源标识和/或目标标识；或者，专用比特指示信息指示MAC PDU对应的业务类型为组播时，该组播业务类型可以指示MAC PDU中携带源标识和/或目标标识；或者，专用比特指示信息指示MAC PDU对应的业务类型为广播时，该广播业务类型可以指示MAC PDU中不携带源标识和/或目标标识。
在一种可能的设计中，专用比特指示信息指示MAC PDU对应的业务类型为单播时，该 单播业务类型可以指示MAC PDU中不携带源标识和/或目标标识；或者，专用比特指示信息指示MAC PDU对应的业务类型为组播时，该组播业务类型可以指示MAC PDU中不携带源标识和/或目标标识；或者，专用比特指示信息指示MAC PDU对应的业务类型为广播时，该广播业务类型可以指示MAC PDU中携带源标识和/或目标标识。
在一种可能的设计中，该TB的传输信道为侧行链路单播传输信道，该目标标识的类型为目标终端设备的标识，和/或，该业务类型为单播；或者，该TB的传输信道为侧行链路组播传输信道，该目标标识的类型为目标组标识，和/或，该业务类型为组播；或者，该TB的传输信道为侧行链路广播传输信道，该目标标识的类型为目标服务标识，和/或，该业务类型为广播。由于本申请实施例中，TB的传输信道的信息可以指示该MAC PDU中携带的目标标识的类型和/或该MAC PDU对应的业务类型，因此，可以使第一终端设备根据不同的业务类型和/或目标标识的类型进行相应的后续处理。
在一种可能的设计中，该TB的传输信道的信息为第一传输信道信息，该MAC PDU中携带该目标标识；或者，该TB的传输信道的信息为第二传输信道信息，该MAC PDU中携带该源标识；或者，该TB的传输信道的信息为第三传输信道信息，该MAC PDU中携带该源标识和该目标标识；或者，该TB的传输信道的信息为第四传输信道信息，该MAC PDU中不携带该源标识和该目标标识；或者，该TB的传输信道的信息为第五传输信道信息，该MAC PDU中不携带该目标标识；或者，该TB的传输信道的信息为第六传输信道信息，该MAC PDU中不携带该源标识。由于本申请实施例中，HARQ进程信息可以指示该MAC PDU中是否携带源标识和/或目标标识，因此，可以使第一终端设备根据MAC PDU中携带的内容进行相应的后续处理。
在一种可能的设计中，TB的传输信道信息指示MAC PDU对应的业务类型为单播时，该单播业务类型可以指示MAC PDU中携带源标识和/或目标标识；或者，TB的传输信道信息指示MAC PDU对应的业务类型为组播时，该组播业务类型可以指示MAC PDU中携带源标识和/或目标标识；或者，TB的传输信道信息指示MAC PDU对应的业务类型为广播时，该广播业务类型可以指示MAC PDU中不携带源标识和/或目标标识。
在一种可能的设计中，TB的传输信道信息指示MAC PDU对应的业务类型为单播时，该单播业务类型可以指示MAC PDU中不携带源标识和/或目标标识；或者，TB的传输信道信息指示MAC PDU对应的业务类型为组播时，该组播业务类型可以指示MAC PDU中不携带源标识和/或目标标识；或者，TB的传输信道信息指示MAC PDU对应的业务类型为广播时，该广播业务类型可以指示MAC PDU中携带源标识和/或目标标识。
第三方面，提供了一种通信装置用于实现上述各种方法。该通信装置可以为上述第一方面中的第一终端设备，比如是车载通信装置，或者包含上述第一终端设备的装置，比如各种类型的车辆，或者是上述第一终端设备中包含的装置，比如系统芯片；或者，该通信装置可以为上述第二方面中的第一终端设备，比如是车载通信装置，或者包含上述第一终端设备的装置，比如各种类型的车辆，或者是上述第一终端设备中包含的装置，比如系统芯片。所述通信装置包括实现上述方法相应的模块、单元、或手段(means)，该模块、单元、或means可以通过硬件实现，软件实现，或者通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块或单元。
第四方面，提供了一种通信装置，包括：处理器和存储器；该存储器用于存储计算机指令，当该处理器执行该指令时，以使该通信装置执行上述任一方面所述的方法。该通信装置可以为上述第一方面中的第一终端设备，比如是车载通信装置，或者包含上述第一终端设备 的装置，比如各种类型的车辆，或者是上述第一终端设备中包含的装置，比如系统芯片；或者，该通信装置可以为上述第二方面中的第一终端设备，比如是车载通信装置，或者包含上述第一终端设备的装置，比如各种类型的车辆，或者是上述第一终端设备中包含的装置，比如系统芯片。
第五方面，提供了一种通信装置，包括：处理器；所述处理器用于与存储器耦合，并读取存储器中的指令之后，根据所述指令执行如上述任一方面所述的方法。该通信装置可以为上述第一方面中的第一终端设备，比如是车载通信装置，或者包含上述第一终端设备的装置，比如各种类型的车辆，或者是上述第一终端设备中包含的装置，比如系统芯片；或者，该通信装置可以为上述第二方面中的第一终端设备，比如是车载通信装置，或者包含上述第一终端设备的装置，比如各种类型的车辆，或者是上述第一终端设备中包含的装置，比如系统芯片。
第六方面，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，当所述指令在通信装置上运行时，使得通信装置可以执行上述任一方面所述的方法。该通信装置可以为上述第一方面中的第一终端设备，比如是车载通信装置，或者包含上述第一终端设备的装置，比如各种类型的车辆，或者是上述第一终端设备中包含的装置，比如系统芯片；或者，该通信装置可以为上述第二方面中的第一终端设备，比如是车载通信装置，或者包含上述第一终端设备的装置，比如各种类型的车辆，或者是上述第一终端设备中包含的装置，比如系统芯片。
第七方面，提供了一种包含指令的计算机程序产品，当所述指令在通信装置上运行时，使得所述通信装置可以执行上述任一方面所述的方法。该通信装置可以为上述第一方面中的第一终端设备，比如是车载通信装置，或者包含上述第一终端设备的装置，比如各种类型的车辆，或者是上述第一终端设备中包含的装置，比如系统芯片；或者，该通信装置可以为上述第二方面中的第一终端设备，比如是车载通信装置，或者包含上述第一终端设备的装置，比如各种类型的车辆，或者是上述第一终端设备中包含的装置，比如系统芯片。
第八方面，提供了一种通信装置(例如，该通信装置可以是芯片或芯片系统)，该通信装置包括处理器，用于实现上述任一方面中所涉及的功能。在一种可能的设计中，该通信装置还包括存储器，该存储器，用于保存必要的程序指令和数据。该通信装置是芯片系统时，可以由芯片构成，也可以包含芯片和其他分立器件。
其中，第三方面至第八方面中任一种设计方式所带来的技术效果可参见上述第一方面或第二方面中不同设计方式所带来的技术效果，此处不再赘述。
第九方面，提供一种通信系统，该通信系统包括上述方面所述的第一终端设备和上述方面所述的第二终端设备。
附图说明
图1为现有的MAC PDU的组成结构示意图；
图2为现有的SL-SCH子头的格式示意图一；
图3为现有的SL-SCH子头的格式示意图二；
图4a为本申请实施例提供的广播场景下的通信示意图；
图4b为本申请实施例提供的组播场景下的通信示意图；
图5为本申请实施例提供的通信系统的示意图；
图6为本申请实施例提供的终端设备的结构示意图；
图7为本申请实施例提供的通信方法的流程示意图一；
图8为本申请实施例提供的通信方法的流程示意图二；
图9为本申请实施例提供的第一终端设备的协议层示意图；
图10为本申请实施例提供的第一终端设备的又一种结构示意图。
具体实施方式
为了方便理解本申请实施例的技术方案，首先给出本申请相关技术的简要介绍如下。
第一，广播：
在本申请实施例中，广播是一对所有的通信方式，在一个广播域中可以包括多个终端成员，广播域中入网之后的终端成员之间可以相互通信。
其中，广播域中已经入网的任何终端都可以作为广播源，发送广播报文；同时可以作为广播成员，接收广播报文。比如，假设广播域中已经入网的终端成员包括终端1、终端2、终端3、终端4、终端5和终端6。以终端1作为广播源为例，则对应的通信示意图可以如图4a所示，即终端1发送的广播报文可以分别传输到广播域中的终端2、终端3、终端4、终端5和终端6。
第二，组播：
本申请实施例中，多个终端设备可以组成一个组播组(也可以简称组播组)。其中，以组播组地址为目的地址，发送报文的信源称为组播源，接收组播数据的组播用户称为组播成员。比如，假设局域网(local area network，LAN)群组中的终端成员包括终端1、终端2、终端3、终端4、终端5和终端6。以终端1作为组播源，终端3、终端5和终端6作为组播成员组成一个组播组为例，则对应的通信示意图可以如图4b所示，即终端1发送的组播报文可以分别传输到组播组中的终端3、终端5和终端6。
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行描述。其中，在本申请的描述中，除非另有说明，“/”表示前后关联的对象是一种“或”的关系，例如，A/B可以表示A或B；本申请中的“和/或”仅仅是一种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这三种情况，其中A,B可以是单数或者复数。并且，在本申请的描述中，除非另有说明，“多个”是指两个或多于两个。“以下至少一项(个)”或其类似表达，是指的这些项中的任意组合，包括单项(个)或复数项(个)的任意组合。例如，a，b，或c中的至少一项(个)，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。另外，为了便于清楚描述本申请实施例的技术方案，在本申请的实施例中，采用了“第一”、“第二”等字样对功能和作用基本相同的相同项或相似项进行区分。本领域技术人员可以理解“第一”、“第二”等字样并不对数量和执行次序进行限定，并且“第一”、“第二”等字样也并不限定一定不同。
如图5所示，为本申请实施例提供的一种通信系统20。该通信系统20包括一个第一终端设备30，以及与该第一终端设备30连接的一个第二终端设备40。
以图5所示的第一终端设备30与第二终端设备40进行交互为例，本申请实施例中，一种可能的实现方式中，第一终端设备接收来自第二终端设备的SCI和TB，该TB中包括层2PDU，其中，SCI中包括源标识和/或目标标识，层2 PDU中可能不包括源标识和/或目标标识，其中，该方案的具体实现将在后续方法实施例中详细描述，在此不予赘述。基于该方案，由于SCI中包括源标识和/或目标标识，在层2 PDU中可能不包括源标识和/或目标标识，降低了数据冗余，节省了层2 PDU的开销。
或者，以图5所示的第一终端设备30与第二终端设备40进行交互为例，本申请实施例 中，一种可能的实现方式中，第一终端设备接收来自第二终端设备的TB，该TB中包括MAC PDU，第一终端设备可以获取第一信息，该第一信息指示该MAC PDU对应的业务类型，或者，该第一信息指示该MAC PDU中携带的目标标识的类型，或者，该第一信息指示MAC PDU中携带目标标识和/或源标识，或者，该第一信息指示MAC PDU中不携带目标标识和/或源标识，其中，该方案的具体实现将在后续方法实施例中详细描述，在此不予赘述。基于该方案，由于第一信息指示MAC PDU对应的业务类型，第一终端设备可以通过业务类型区分不同的业务，以便后续根据不同的业务进行相应处理；或者，由于第一信息指示MAC PDU中携带的目标标识的类型，该目标标识的类型能够反映出MAC PDU的业务类型，因此，第一终端设备可以区分不同的业务类型，以便后续根据不同的业务进行相应处理；或者，由于第一信息指示MAC PDU中是否携带源标识和/或目标标识，因此，第一终端设备可以根据MAC PDU中携带的内容进行相应处理。
可选的，本申请实施例中的终端设备(包括上述第一终端设备和第二终端设备)可以是车辆(vehicle)；也可以是安装在车辆上用于辅助车辆行驶的车载终端，或者车载终端内的芯片。其中，该车载终端可以是第五代(5th generation，5G)网络或者未来演进的公共陆地移动网络(public land mobile network，PLMN)中的用户设备(user equipment，UE)、接入终端、终端单元、终端站、移动站、移动台、远方站、远程终端、移动设备、无线通信设备、终端代理或终端装置等。接入终端可以是蜂窝电话、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、个人数字处理(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、车载设备或可穿戴设备，虚拟现实(virtual reality，VR)终端设备、增强现实(augmented reality，AR)终端设备、工业控制(industrial control)中的无线终端或无人驾驶(self driving)中的无线终端等。该车载终端可以是移动的，也可以是固定的。
可选的，本申请实施例中的第一终端设备30与第二终端设备40也可以称之为通信设备(或通信装置)，其可以是一个通用设备或者是一个专用设备，本申请实施例对此不作具体限定。
可选的，本申请实施例中，图5中的第一终端设备或者第二终端设备可以通过图6中的通信设备(或通信装置)60来实现。图6所示为本申请实施例提供的通信设备60的结构示意图。该通信设备60包括一个或多个处理器601，通信线路602，以及至少一个通信接口(图6中仅是示例性的以包括通信接口604，以及一个处理器601为例进行说明)，可选的还可以包括存储器603。
处理器601可以是一个通用中央处理器(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方案程序执行的集成电路。
通信线路602可包括一通路，用于连接不同组件之间。
通信接口604，可以是收发模块用于与其他设备或通信网络通信，如以太网，无线接入网(radio access network，RAN)，无线局域网(wireless local area networks，WLAN)等。例如，所述收发模块可以是收发器、收发机一类的装置。可选的，所述通信接口604也可以是位于处理器601内的收发电路，用以实现处理器的信号输入和信号输出。
存储器603可以是具有存储功能的装置。例如可以是只读存储器(read-only memory，ROM)或可存储静态信息和指令的其他类型的静态存储设备，随机存取存储器(random access memory，RAM)或者可存储信息和指令的其他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他磁存储设备、或者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他介质，但不限于此。存储器可以是独立存在，通过通信线路602与处理器相连接。存储器也可以和处理器集成在一起。
其中，存储器603用于存储执行本申请方案的计算机执行指令，并由处理器601来控制执行。处理器601用于执行存储器603中存储的计算机执行指令，从而实现本申请实施例中提供的通信方法。
或者，可选的，本申请实施例中，也可以是处理器601执行本申请下述实施例提供的通信方法中的处理相关的功能，通信接口604负责与其他设备或通信网络通信，本申请实施例对此不作具体限定。
可选的，本申请实施例中的计算机执行指令也可以称之为应用程序代码，本申请实施例对此不作具体限定。
在具体实现中，作为一种实施例，处理器601可以包括一个或多个CPU，例如图6中的CPU0和CPU1。
在具体实现中，作为一种实施例，通信设备60可以包括多个处理器，例如图6中的处理器601和处理器608。这些处理器中的每一个可以是一个单核(single-CPU)处理器，也可以是一个多核(multi-CPU)处理器。这里的处理器可以指一个或多个设备、电路、和/或用于处理数据(例如计算机程序指令)的处理核。
在具体实现中，作为一种实施例，通信设备600还可以包括输出设备605和输入设备606。输出设备605和处理器601通信，可以以多种方式来显示信息。例如，输出设备605可以是液晶显示器(liquid crystal display，LCD)，发光二级管(light emitting diode，LED)显示设备，阴极射线管(cathode ray tube，CRT)显示设备，或投影仪(projector)等。输入设备606和处理器601通信，可以以多种方式接收用户的输入。例如，输入设备606可以是鼠标、键盘、触摸屏设备或传感设备等。
下面将结合图1至图6，以图5所示的第一终端设备30与第二终端设备40进行交互为例，对本申请实施例提供的通信方法进行展开说明。
需要说明的是，本申请下述实施例中各个网元之间的消息名字或消息中各参数的名字等只是一个示例，具体实现中也可以是其他的名字，本申请实施例对此不作具体限定。
需要说明的是，本申请下述实施例中除特殊说明外，业务类型也可以称为业务模式或传输类型，在此统一说明，下述实施例中不再赘述。
如图7所示，为本申请实施例提供的一种通信方法，该通信方法包括如下步骤：
S701、第二终端设备向第一终端设备发送SCI。相应的，第一终端设备接收来自第二终端设备的该SCI。
可选的，本申请实施例中，该SCI可以为第一SCI，即该SCI中包括源标识和/或目标标识；也可以为第二SCI，即该SCI中不包括源标识和目标标识，本申请实施例对此不做具体限定。其中，该源标识指示发送IoV业务数据的终端设备，该目标标识指示接收IoV业务数据的终端设备，该目标标识的类型可能为目标终端设备的标识，或者可能为目标组的标识，或者也可能为目标服务的标识，本申请实施例对此不做具体限定。其中，本申请实施例中的源标识和/或目标标识可以为一个完整的标识，也可以为一个完整标识中的部分比特。
可选的，本申请实施例中，可以通过在第一SCI中的不同字段携带标识来区分该第一SCI中携带的是源标识还是目标标识，例如，可以在第一SCI中的第一字段携带源标识，该第一字段可以称为源字段，在第一SCI中的第二字段携带目标标识，该第二目标标识可以称为目标字段，其中，第一字段和第二字段为第一SCI中的不同字段。当然，也可以通过其他方式来区分第一SCI中携带的标识为源标识还是目标标识，本申请实施例对此不做具体限定。
可选的，本申请实施例中，上述第一SCI、第二SCI的长度可以相同也可以不同，本申请实施例对此不做具体限定。例如，上述两种SCI的长度相同，均为第一SCI所占的比特数，在该场景下，第二SCI中存在不携带任何信息的比特(或者可以理解为填充比特)；或者，上述两种SCI的长度不相同，第一SCI的长度为长度1，第二SCI的长度为长度2。需要说明的是，包括源标识或目标标识的第一SCI和包括源标识和目标标识的第一SCI的长度可能相同也可能不相同，本申请实施例对此不做具体限定。
S702、第二终端设备向第一终端设备发送传输块TB。相应的，第一终端设备接收来自第二终端设备的该TB。
其中，本申请实施例中，该TB中包括层2分组数据单元PDU。可选的，第一终端设备的物理层接收到上述TB之后，第一终端设备的MAC层可以解码该TB获得该层2 PDU，本申请实施例对此不做具体限定。
可选的，本申请实施例中的层2例如可以包括MAC层、无线链路控制(radio link control，RLC)层、分组数据汇聚协议(packet data convergence protocol，PDCP)层。相应的，本申请实施例中，该层2 PDU可以为MAC PDU，或者可以为RLC PDU，或者可以为PDCP PDU，本申请实施例对此不做具体限定。
其中，本申请实施例中，上述SCI和层2 PDU中是否包括源标识和/或目标标识，可能存在如下五种情况：
情况一、SCI中包括第一源标识，层2 PDU中不包括层2源标识。在该情况一下，SCI为第一SCI。其中，本申请实施例中，第一源标识为层2源标识，例如，该层2源标识可以为24位的标识，如00000000 00001101 11001001；或者，第一源标识为物理层源标识，例如，该物理层源标识可以为8位的标识，如10110001。可选的，该物理层源标识还可以为根据该层2源标识生成的标识，例如，可以将该层2源标识中的部分比特经过变换处理或者与其他标识信息结合得到该物理层源标识，对于根据层2源标识生成物理层源标识的具体方式本申请实施例不做具体限定。
情况二、SCI中包括第一目标标识，层2 PDU中不包括层2目标标识。
在该情况二下，SCI为第一SCI。其中，本申请实施例中，第一目标标识为层2目标标识，例如，该层2目标标识可以为24位的标识，如00001000 00010011 01010011；或者，第一目标标识为物理层目标标识，例如，该物理层目标标识可以为8位的标识，如00111000。可选的，该物理层目标标识还可以为根据该层2目标标识生成的标识，例如，可以将该层2目标标识中的部分比特经过变换处理或者与其他标识信息结合得到该物理层目标标识，对于根据层2目标标识生成物理层目标标识的具体方式本申请实施例不做具体限定。
可选的，本申请实施例中，在该情况二下，第一终端设备可以根据该第一目标标识确定上述TB对应的业务类型，其中，业务类型包括单播、组播和广播。示例性的，第一终端设备接收到第一SCI之后，可以解码该SCI获得第一目标标识的内容，该第一目标标识的内容可以反映TB对应的业务类型，例如，该第一目标标识为目标终端设备的标识时，该业务类型可能为单播业务；或者，该第一目标标识为目标组标识时，该业务类型可能为组播业务； 或者，该第一目标标识为目标服务标识时，该业务类型可能为广播业务，在该场景下，IoV系统中的终端设备可以发布不同的服务，每个服务对应不同的服务标识，相应的，每个终端设备可以通过服务标识订阅其他终端设备发布的不同的服务。
需要说明的是，本申请实施例中TB对应的业务类型也可以描述为TB中包括的层2 PDU对应的业务类型，在此统一说明，下文不再赘述。
情况三、SCI中包括第二源标识，层2 PDU中包括第三源标识。
在该情况三下，SCI为第一SCI。其中，第二源标识为上述层2源标识中的第一比特位，第三源标识为上述层2源标识中除第一比特位之外的其他比特位。
可选的，该第一比特位可以为层2源标识中连续的N个高比特位，或者，也可以为层2源标识中连续的M个低位比特位，其中，N和M均为正整数。示例性的，若该层2源标识为48比特，该第一比特位可以为该层2源标识中连续的16个高比特位，此时，第三源标识可以为该层2源标识中连续的32个低比特位；或者，该第一比特位可以为该层2源标识中连续的32个低比特位，此时，第三源标识为该层2源标识中连续的16个高比特位。
情况四、SCI中包括第二目标标识，层2 PDU中包括第三目标标识。
在该情况四下，SCI为第一SCI。其中，第二目标标识为上述层2目标标识中的第二比特位，第三目标标识为上述层2目标标识中除第二比特位之外的其他比特位。
可选的，该第二比特位可以为层2目标标识中连续的P个高比特位，或者，也可以为层2目标标识中连续的Q个低比特位，其中，P和Q均为正整数。示例性的，若该层2目标标识为48比特，该第二比特位可以为该层2目标标识中连续的16个高比特位，此时，第三目标标识为该层2目标标识中连续的32个低比特位；或者，该第二比特位可以为该层2目标标识中连续的16个低比特位，此时，第三目标标识为该层2目标标识中连续的32个高比特位。
可选的，本申请实施例中，在该情况四下，第一终端设备可以根据该第二目标标识确定上述第三目标标识的类型。示例性的，第一终端设备可以根据该第二目标标识，确定上述TB对应的业务类型，再根据所述TB对应的业务类型确定该第三目标标识的类型。其中，第一终端设备根据第二目标标识确定TB对应的业务类型的方法可参考上述情况二中第一终端设备根据第一目标标识确定TB对应的业务类型的方法，此处不再赘述。第一终端设备确定TB对应的业务类型之后，又由于不同的业务类型对应的目标标识的类型不同，因此可以根据业务类型确定出第三目标标识的类型。
可选的，本申请实施例中，TB对应的业务类型为单播，则该第三目标标识的类型为目标终端设备的标识；或者，TB对应的业务类型为组播，则该第三目标标识的类型为目标组标识；或者，TB对应的业务类型为广播，则该第三目标标识的类型为目标服务标识。
情况五、SCI中不包括层2源标识和层2目标标识，层2 PDU中包括该层2源标识和该层2目标标识。在该情况五下，SCI为第二SCI。
需要说明的是，在上述五种情况中，可能同时存在情况一和情况二，即SCI中包括第一源标识和第一目标标识，层2 PDU中不包括层2源标识和层2目标标识；或者，也可能同时存在情况三和情况四，即SCI中包括第二源标识和第二目标标识，层2 PDU中包括第三源标识和第三目标标识。
可选的，本申请实施例中，第一终端设备接收到上述SCI和TB之后，可以解码该SCI并根据该SCI中的内容确定TB中包括的层2 PDU中是否包括源标识和/或目标标识；或者，由于第一终端设备可能接收到上述第一SCI和第二SCI两种格式的SCI，因此，第一终端设备也可以根据该SCI的格式确定TB中包括的层2 PDU中是否包括源标识和/或目标标识，即 第一终端设备可以先判断接收到的SCI的格式，再根据SCI的格式确定层2 PDU中是否包括源标识和/或目标标识，本申请实施例对此不做具体限定。
示例性的，对于上述情况一，若该SCI包括第一源标识，则第一终端设备确定该SCI为第一SCI，且层2 PDU中不包括上述层2源标识。对于上述情况二，若该SCI包括第一目标标识，则第一终端设备确定该SCI为第一SCI，且层2 PDU中不包括上述层2目标标识。对于上述情况三，若该SCI包括第二源标识，则第一终端设备确定该SCI为第一SCI，且层2 PDU中包括第三源标识。对于上述情况四，若该SCI包括第二目标标识，则第一终端设备确定该SCI为第一SCI，且层2 PDU中包括第三目标标识。对于上述情况五，若该SCI不包括层2源标识和层2目标标识，则第一终端设备确定该SCI为第二SCI，且层2ODU中包括该层2源标识和层2目标标识。
基于本申请提供的通信方法，SCI中包括第一源标识，层2 PDU中不包括层2源标识；或者，在SCI中包括第一目标标识，层2 PDU中不包括层2目标标识；或者，SCI中包括第二源标识，层2 PDU中包括第三源标识，其中第二源标识和第三源标识均为层2源标识中的部分比特；或者，SCI中包括第二目标标识，层2 PDU中包括第三目标标识，其中第二目标标识和第三目标标识均为层2目标标识中的部分比特，避免了在层2 PDU中携带冗余的标识信息，减少了数据冗余，从而降低了层2 PDU的开销。
其中，上述步骤S701至S702中的第一终端设备的动作可以由图6所示的终端设备60中的处理器601调用存储器603中存储的应用程序代码以指令该终端设备执行，本实施例对此不作任何限制。
此外，由于在现有的LTE IoV通信中没有单播和组播业务，TB包括的MAC PDU中携带的目标标识的类型均相同，但是，在NR IoV通信中MAC PDU对应的业务类型存在单播、组播和广播三种不同的类型，每种业务类型对应的MAC PDU中携带的目标标识的类型也不同，因此，在NR IoV通信中，如何区分MAC PDU对应的业务类型以及MAC PDU中携带的目标标识的类型，是目前亟待解决的问题。
基于此，如图8所示，本申请实施例提供一种通信方法，该通信方法包括如下步骤：
S801、第二终端设备向第一终端设备发送传输块TB。相应的，第一终端设备接收来自该第二终端设备的TB。
其中，该TB中包括MAC PDU。可选的，第一终端设备的物理层接收到上述TB之后，第一终端设备的MAC层可以解码该TB获得该MAC PDU，本申请实施例对此不做具体限定。
S802、第一终端设备获取第一信息。
其中，第一信息可以包括HARQ进程信息、MAC PDU头中V字段的信息、专用比特指示信息、上述TB的传输信道的信息中的一种或多种，该第一信息用于指示MAC PDU中携带的目标标识的类型，或者，该第一信息用于指示所述MAC PDU对应的业务类型，或者，该第一信息用于指示所述MAC PDU中携带源标识和/或目标标识，或者，该第一信息用于指示所述MAC PDU中不携带源标识和/或目标标识。
S803、第一终端设备根据第一信息确定MAC PDU携带的目标标识的类型，或者MAC PDU对应的业务类型，或者MAC PDU中是否携带源标识和/或目标标识。
需要说明的是，第一终端设备可以根据HARQ进程信息、MAC PDU头中V字段的信息、专用比特指示信息、上述TB的传输信道的信息中的一种信息或者多种信息的组合来确定MAC PDU对应的业务类型，或者确定MAC PDU中携带的目标标识类型，或者确定MAC PDU中是否携带源标识和/或目标标识。下面分别对第一终端设备如何根据每种可能的第一信息确 定MAC PDU对应的业务类型或者确定MAC PDU中携带的目标标识类型或者确定MAC PDU中是否携带源标识和/或目标标识进行详细说明。
可选的，本申请实施例中，第一信息为HARQ进程信息时，该HARQ进程信息可以为第一终端设备接收到上述TB时对应的HARQ进程号所属的HARQ进程类别；或者，该HARQ进程信息可以为第一终端设备接收到上述TB时对应的HARQ进程号，根据HARQ进程号可以确定该HARQ进程所属的HARQ进程类别。由于本申请实施例中，TB对应的业务类型不同，接收该TB时对应的HARQ进程类别不同，因此，不同的HARQ信息可以指示不同的MAC PDU对应的业务类型或MAC PDU中携带的目标标识的类型或MAC PDU中是否携带源标识和/或目标标识，即可以使用不同的HARQ进程信息指示MAC PDU对应的业务类型，或者使用不同的HARQ进程信息指示MAC PDU携带的目标标识的类型，或者使用不同的HARQ进行信息指示MAC PDU中是否携带源和/或目标标识。
示例性的，当HARQ进程信息用于指示MAC PDU对应的业务类型，或HARQ进程信息用于指示MAC PDU中携带的目标标识的类型时，若该HARQ进程信息为第一HARQ进程信息，第一终端设备确定上述业务类型为单播，或者，上述目标标识的类型为目标终端设备的标识；或者，若该HARQ进程信息为第二HARQ进程信息，第一终端设备确定上述业务类型为组播，或者，上述目标标识的类型为目标组标识；或者，若该HARQ进程信息为第三HARQ进程信息，第一终端设备确定上述业务类型为广播，或者，上述目标标识的类型为目标服务标识。示例性的，第一HARQ进程信息可以为HARQ进程类别1，或者，第一HARQ信息可以表示上述HARQ进程的进程号为1，该进程号为1的HARQ进程属于HAQR进程类别1，此时，第一终端设备可以确定上述业务类型为单播，或者，目标标识的类型为目标终端设备的标识；第二HARQ进程信息可以为HARQ进程类别2，或者，第二HARQ信息可以表示上述HARQ进程的进程号为2，该进程号为2的HARQ进程属于HAQR进程类别2，此时，第一终端设备可以确定上述业务类型为组播，或者，目标标识的类型为目标组标识；第三HARQ进程信息可以为HARQ进程类别3，或者，第三HARQ信息可以表示上述HARQ进程的进程号为3，该进程号为3的HARQ进程属于HAQR进程类别3，此时，第一终端设备可以确定上述业务类型为广播，或者，目标标识的类型为目标服务标识。
示例性的，当HARQ进程信息用于指示MAC PDU中是否携带源标识和/或目标标识时，若该HARQ进程信息为第一HARQ进程信息，第一终端设备可以确定MAC PDU中携带目标标识；或者，若该HARQ进程信息为第二HARQ进程信息，第一终端设备可以确定MAC PDU中携带源标识；或者，若该HARQ进程信息为第三HARQ进程信息，第一终端设备可以确定MAC PDU中携带源标识和目标标识；或者，若该HARQ进程信息为第四HARQ进程信息，第一终端设备可以确定MAC PDU中不携带源标识和目标标识；或者，若该HARQ进程信息为第五HARQ进程信息，第一终端设备可以确定MAC PDU中不携带目标标识；或者，若该HARQ进程信息为第六HARQ进程信息，第一终端设备可以确定MAC PDU中不携带源标识。可选的，本申请实施例中，HARQ进程信息可以通过上述方法显式地指示MAC PDU中携带的目标标识的类型或者MAC PDU中是否携带源标识和/或目标标识。或者，HARQ进程信息也可以仅指示MAC PDU对应的业务类型，通过MAC PDU对应的业务类型间接指示MAC PDU中携带的目标标识的类型，即HARQ进程信息指示MAC PDU对应的业务类型和MAC PDU中携带的目标标识的类型，或者通过MAC PDU对应的业务类型间接指示MAC PDU中是否携带源标识和/或目标标识，即HARQ进程信息指示MAC PDU对应的业务类型和MAC PDU中是否携带源标识和/或目标标识。
示例性的，HARQ进程信息指示MAC PDU对应的业务类型为单播时，该单播业务类型可以指示MAC PDU中携带的目标标识的类型为目标终端设备的标识，或者，该单播业务类型可以指示MAC PDU中携带源标识和/或目标标识。或者，HARQ进行信息指示MAC PDU对应的业务类型为组播时，该组播业务类型可以指示MAC PDU中携带的目标标识的类型为目标组标识，或者，该组播业务类型可以指示MAC PDU中携带源标识和/或目标标识。或者，HARQ进行信息指示MAC PDU对应的业务类型为广播时，该广播业务类型可以指示MAC PDU中携带的目标标识的类型为目标服务标识，或者，该广播业务类型可以指示MAC PDU中不携带源标识和/或目标标识。
或者，可选的，在一种可能的指示方式中，HARQ进程信息指示MAC PDU对应的业务类型为单播时，该单播业务类型可以指示MAC PDU中不携带源标识和/或目标标识；或者，HARQ进行信息指示MAC PDU对应的业务类型为组播时，该组播业务类型可以指示MAC PDU中不携带源标识和/或目标标识；或者，HARQ进行信息指示MAC PDU对应的业务类型为广播时，该广播业务类型可以指示MAC PDU中携带源标识和/或目标标识。
可选的，第一信息为MAC PDU头中V字段的信息时，该MAC PDU头中的V字段可以为SL-SCH子头中的V字段。本申请实施例中，可以使用V字段的不同取值来指示MAC PDU对应的业务类型，或者，使用V字段的不同取值来指示MAC PDU中是否携带源标识和/或目标标识，或者，使用V字段的不同取值来指示MAC PDU中携带的目标标识的类型，可选的，可以通过MAC PDU对应的业务类型指示MAC PDU中携带的目标标识的类型。
示例性的，当V字段的取值用于指示MAC PDU对应的业务类型，或者V字段的取值用于指示MAC PDU中携带的目标标识的类型时，若该MAC PDU头中V字段为第一取值，第一终端设备确定MAC PDU对应的业务类型为单播，或者，MAC PDU中携带的目标标识的类型为目标终端设备的标识；或者，若该MAC PDU头中V字段为第二取值，第一终端设备确定MAC PDU对应的业务类型为组播，或者，MAC PDU中携带的目标标识的类型为目标组标识；或者，若该MAC PDU头中V字段为第三取值，第一终端设备确定MAC PDU对应的业务类型为广播，或者，MAC PDU中携带的目标标识的类型为目标服务标识。示例性的，若MAC PDU头中的V字段为4比特，该第一取值可以为“1111”，此时，第一终端设备确定MAC PDU对应的业务类型为单播，或者，MAC PDU中携带的目标标识的类型为目标终端设备的标识；该第二取值可以为“0011”，此时，第一终端设备确定MAC PDU对应的业务类型为组播，或者，MAC PDU中携带的目标标识的类型为目标组标识；该第三取值可以为“0000”，此时，第一终端设备确定MAC PDU对应的业务类型为广播，或者，MAC PDU中携带的目标标识的类型为目标服务标识。上述V字段的长度以及不同取值指示的业务类型只是本申请实施例的示例性说明，实际应用中，本申请实施例对此不做具体限定。
示例性的，当V字段的取值用于指示MAC PDU中是否携带源标识和/或目标标识时，若该V字段的取值为第一取值，第一终端设备可以确定MAC PDU中携带目标标识；或者，若该V字段的取值为第二取值，第一终端设备可以确定MAC PDU中携带源标识；或者，若该V字段的取值为第三取值，第一终端设备可以确定MAC PDU中携带源标识和目标标识；或者，若该V字段的取值为第四取值，第一终端设备可以确定MAC PDU中不携带源标识和目标标识；或者，若该V字段的取值为第五取值，第一终端设备可以确定MAC PDU中不携带目标标识；或者，若该V字段的取值为第六取值，第一终端设备可以确定MAC PDU中不携带源标识。
可选的，本申请实施例中，V字段的取值可以通过上述方法显式地指示MAC PDU中携 带的目标标识的类型或者MAC PDU中是否携带源标识和/或目标标识。或者，V字段的取值也可以仅指示MAC PDU对应的业务类型，通过MAC PDU对应的业务类型间接指示MAC PDU中携带的目标标识的类型，即V字段的取值指示MAC PDU对应的业务类型和MAC PDU中携带的目标标识的类型，或者通过MAC PDU对应的业务类型间接指示MAC PDU中是否携带源标识和/或目标标识，即V字段的取值指示MAC PDU对应的业务类型和MAC PDU中是否携带源标识和/或目标标识。
示例性的，V字段的取值指示MAC PDU对应的业务类型为单播时，该单播业务类型可以指示MAC PDU中携带的目标标识的类型为目标终端设备的标识，或者，该单播业务类型可以指示MAC PDU中携带源标识和/或目标标识。或者，V字段的取值指示MAC PDU对应的业务类型为组播时，该组播业务类型可以指示MAC PDU中携带的目标标识的类型为目标组标识，或者，该组播业务类型可以指示MAC PDU中携带源标识和/或目标标识。或者，V字段的取值指示MAC PDU对应的业务类型为广播时，该广播业务类型可以指示MAC PDU中携带的目标标识的类型为目标服务标识，或者，该广播业务类型可以指示MAC PDU中不携带源标识和/或目标标识。
或者，可选的，在一种可能的指示方式中，V字段的取值指示MAC PDU对应的业务类型为单播时，该单播业务类型可以指示MAC PDU中不携带源标识和/或目标标识；或者，V字段的取值指示MAC PDU对应的业务类型为组播时，该组播业务类型可以指示MAC PDU中不携带源标识和/或目标标识；或者，V字段的取值指示MAC PDU对应的业务类型为广播时，该广播业务类型可以指示MAC PDU中携带源标识和/或目标标识。
可选的，本申请实施例中，第一信息为专用比特指示信息时，该专用比特指示信息可以指示MAC PDU头中前N个比特的取值，其中，N为正整数，该MAC PDU头可以为SL-SCH子头。该专用比特指示信息可以显式地指示MAC PDU头中前N个比特的取值，例如，该专用比特指示信息可以为MAC PDU头中前3个比特的取值为“010”；或者，该专用比特指示信息可以隐式地指示MAC PDU头中前N个比特的取值，本申请实施例对此不做具体限定。本申请实施例中，可以使用MAC PDU头中前N个比特的不同取值来指示MAC PDU对应的业务类型，或者使用MAC PDU头中前N个比特的不同取值来指示MAC PDU中携带的目标标识的类型，或者使用MAC PDU头中前N个比特的不同取值来指示MAC PDU中是否携带源标识和/或目标标识。需要说明的是，本申请实施例对N的取值不做具体限定。
示例性的，当专用比特指示信息用于指示MAC PDU对应的业务类型，或者专用比特指示信息用于指示MAC PDU中携带的目标标识的类型时，若该专用比特指示信息指示的MAC PDU头中前N个比特为第四取值，第一终端设备确定MAC PDU对应的业务类型为单播，或者，MAC PDU中携带的目标标识的类型为目标终端设备的标识；或者，若该专用比特指示信息指示的MAC PDU头中前N个比特为第五取值，或者，第一终端设备确定MAC PDU对应的业务类型为组播，MAC PDU中携带的目标标识的类型为目标组标识；或者，若该专用比特指示信息指示的MAC PDU头中前N个比特为第六取值，第一终端设备确定MAC PDU对应的业务类型为广播，或者，MAC PDU中携带的目标标识的类型为目标服务标识。示例性的，以N为2，即上述专用比特指示信息指示MAC PDU头中前两个比特的取值为例，该第四取值可以为“00”，此时，MAC PDU对应的业务类型为单播，或者，MAC PDU中携带的目标标识的类型为目标终端设备的标识；该第五取值可以为“01”，此时，MAC PDU对应的业务类型为组播，或者，MAC PDU中携带的目标标识的类型为目标组标识；该第六取值可以为“10”，此时，MAC PDU对应的业务类型为广播，或者，MAC PDU中携带的目标标 识的类型为目标服务标识。上述N的取值以及MAC PDU头中前N个比特的不同取值指示的业务类型只是本申请实施例的示例性说明，实际应用中，本申请实施例对此不做具体限定。
示例性的，当专用比特指示信息用于指示MAC PDU中是否携带源标识和/或目标标识时，若该专用比特指示信息指示的MAC PDU头中前N个比特为第一取值，第一终端设备可以确定MAC PDU中携带目标标识；或者，若该专用比特指示信息指示的MAC PDU头中前N个比特为第二取值，第一终端设备可以确定MAC PDU中携带源标识；或者，若该专用比特指示信息指示的MAC PDU头中前N个比特为第三取值，第一终端设备可以确定MAC PDU中携带源标识和目标标识；或者，若该专用比特指示信息指示的MAC PDU头中前N个比特为第四取值，第一终端设备可以确定MAC PDU中不携带源标识和目标标识；或者，若该专用比特指示信息指示的MAC PDU头中前N个比特为第五取值，第一终端设备可以确定MAC PDU中不携带目标标识；或者，若该专用比特指示信息指示的MAC PDU头中前N个比特为第六取值，第一终端设备可以确定MAC PDU中不携带源标识。示例性的，以N为3，即上述专用比特指示信息指示MAC PDU头中前三个比特的取值为例，该第一取值可以为“001”，此时，MAC PDU中携带目标标识；该第二取值可以为“010”，此时，MAC PDU中携带源标识；该第三取值可以为“011”，此时，MAC PDU中携带源标识和目标标识；该第四取值可以为“100”，此时，MAC PDU中不携带目标标识和源标识；该第五取值可以为“101”，此时，MAC PDU中不携带目标标识；该第六取值可以为“110”，此时，MAC PDU中不携带源标识。
可选的，本申请实施例中，专用比特指示信息可以通过上述方法显式地指示MAC PDU中携带的目标标识的类型或者MAC PDU中是否携带源标识和/或目标标识。或者，专用比特指示信息也可以仅指示MAC PDU对应的业务类型，通过MAC PDU对应的业务类型间接指示MAC PDU中携带的目标标识的类型，即专用比特指示信息指示MAC PDU对应的业务类型和MAC PDU中携带的目标标识的类型，或者通过MAC PDU对应的业务类型间接指示MAC PDU中是否携带源标识和/或目标标识，即专用比特指示信息指示MAC PDU对应的业务类型和MAC PDU中是否携带源标识和/或目标标识。
示例性的，专用比特指示信息指示MAC PDU对应的业务类型为单播时，该单播业务类型可以指示MAC PDU中携带的目标标识的类型为目标终端设备的标识，或者，该单播业务类型可以指示MAC PDU中携带源标识和/或目标标识。或者，专用比特指示信息指示MAC PDU对应的业务类型为组播时，该组播业务类型可以指示MAC PDU中携带的目标标识的类型为目标组标识，或者，该组播业务类型可以指示MAC PDU中携带源标识和/或目标标识。或者，专用比特指示信息指示MAC PDU对应的业务类型为广播时，该广播业务类型可以指示MAC PDU中携带的目标标识的类型为目标服务标识，或者，该广播业务类型可以指示MAC PDU中不携带源标识和/或目标标识。
或者，可选的，在一种可能的指示方式中，专用比特指示信息指示MAC PDU对应的业务类型为单播时，该单播业务类型可以指示MAC PDU中不携带源标识和/或目标标识；或者，专用比特指示信息指示MAC PDU对应的业务类型为组播时，该组播业务类型可以指示MAC PDU中不携带源标识和/或目标标识；或者，专用比特指示信息指示MAC PDU对应的业务类型为广播时，该广播业务类型可以指示MAC PDU中携带源标识和/或目标标识。可选的，本申请实施例中，第一信息为专用比特指示信息时，该专用比特指示信息可以指示MAC PDU头中第A个至第B个连续的(共N个，N为正整数)比特位的取值，该MAC PDU头可以为SL-SCH子头。该专用比特指示信息可以显式地指示上述MAC PDU头中第A个至第B个连 续的(共N个)比特位的取值，例如，该专用比特指示信息可以为MAC PDU头中第3个至第6个连续的4个比特位的取值为“0110”；或者，该专用比特指示信息也可以隐式地指示上述MAC PDU头中第A个至第B个连续的(共N个)比特位的取值，本申请实施例对此不做具体限定。本申请实施例中，可以使用上述MAC PDU头中第A个至第B个连续的(共N个)比特位的不同取值来指示MAC PDU对应的业务类型，或者MAC PDU中携带的目标标识的类型，或者MAC PDU中是否携带源标识和/或目标标识。
可选的，本申请实施例中，第一信息为专用比特指示信息时，该专用比特指示信息可以指示图2或图3所示的MAC PDU头中SL-SCH子头的预留比特位(R)中的前N个比特位的取值，其中，N为正整数。该专用比特指示信息可以显式地指示上述预留比特位中前N个比特的取值，例如，该专用比特指示信息可以为上述预留比特位中前2个比特的取值为“01”；或者，该专用比特指示信息也可以隐式地指示上述预留比特位中前N个比特的取值，本申请实施例对此不做具体限定。本申请实施例中，可以使用上述预留比特位中前N个比特的不同取值来指示MAC PDU对应的业务类型，或者MAC PDU中携带的目标标识的类型，或者MAC PDU中是否携带源标识和/或目标标识。
可选的，本申请实施例中，第一信息为上述TB的传输信道的信息时，如图9所示，该第一终端设备包括物理协议层(以下称为物理层)和MAC协议层(以下称为MAC层)，物理层接收到来自第二终端设备的TB后，MAC层从物理层接收该TB。此时，该TB的传输信道信息指第一终端设备的MAC层从物理层接收该TB时的传输信道信息。本申请实施例中，可以使用不同的传输信道信息来指示MAC PDU对应的业务类型，或者使用不同的传输信道信息来指示MAC PDU中是否携带源标识和/或目标标识，或者使用不同的传输信道信息来指示MAC PDU中携带的目标标识的类型，可以选的，可以通过MAC PDU对应的业务类型指示MAC PDU中携带的目标标识的类型。
示例性的，当TB的传输信道信息用于指示MAC PDU对应的业务类型，或TB的传输信道信息用于指示MAC PDU中携带的目标标识的类型时，若该TB的传输信道为侧行链路单播传输信道，即第一终端设备的MAC层经由侧行链路单播传输信道接收到该TB，此时，第一终端设备确定MAC PDU对应的业务类型为单播，或者，MAC PDU中携带的目标标识的类型为目标终端设备的标识；或者，该TB的传输信道为侧行链路组播传输信道，即第一终端设备的MAC层经由侧行链路组播传输信道接收到该TB，此时，第一终端设备确定MAC PDU对应的业务类型为组播，或者，MAC PDU中携带的目标标识的类型为目标组标识；或者，该TB的传输信道为侧行链路广播传输信道，即第一终端设备的MAC层经由侧行链路广播传输信道接收到该TB，此时，第一终端设备确定MAC PDU对应的业务类型为广播，或者，MAC PDU中携带的目标标识的类型为目标服务标识。
示例性的，当TB的传输信道信息用于指示MAC PDU中是否携带源标识和/或目标标识时，若该TB的传输信道的信息为第一传输信道信息，第一终端设备可以确定MAC PDU中携带目标标识；或者，若该TB的传输信道的信息为第二传输信道信息，第一终端设备可以确定MAC PDU中携带源标识；或者，若该TB的传输信道的信息为第三传输信道信息，第一终端设备可以确定MAC PDU中携带源标识和目标标识；或者，若该TB的传输信道的信息为第四传输信道信息，第一终端设备可以确定MAC PDU中不携带源标识和目标标识；或者，若该TB的传输信道的信息为第五传输信道信息，第一终端设备可以确定MAC PDU中不携带目标标识；或者，若该TB的传输信道的信息为第六传输信道信息，第一终端设备可以确定MAC PDU中不携带源标识。
可选的，本申请实施例中，TB的传输信道信息可以通过上述方法显式地指示MAC PDU中携带的目标标识的类型或者MAC PDU中是否携带源标识和/或目标标识。或者，TB的传输信道信息也可以仅指示MAC PDU对应的业务类型，通过MAC PDU对应的业务类型间接指示MAC PDU中携带的目标标识的类型，即TB的传输信道信息指示MAC PDU对应的业务类型和MAC PDU中携带的目标标识的类型，或者通过MAC PDU对应的业务类型间接指示MAC PDU中是否携带源标识和/或目标标识，即TB的传输信道信息指示MAC PDU对应的业务类型和MAC PDU中是否携带源标识和/或目标标识。
示例性的，TB的传输信道信息指示MAC PDU对应的业务类型为单播时，该单播业务类型可以指示MAC PDU中携带的目标标识的类型为目标终端设备的标识，或者，该单播业务类型可以指示MAC PDU中携带源标识和/或目标标识。或者，TB的传输信道信息指示MAC PDU对应的业务类型为组播时，该组播业务类型可以指示MAC PDU中携带的目标标识的类型为目标组标识，或者，该组播业务类型可以指示MAC PDU中携带源标识和/或目标标识。或者，TB的传输信道信息指示MAC PDU对应的业务类型为广播时，该广播业务类型可以指示MAC PDU中携带的目标标识的类型为目标服务标识，或者，该广播业务类型可以指示MAC PDU中不携带源标识和/或目标标识。
或者，可选的，在一种可能的指示方式中，TB的传输信道信息指示MAC PDU对应的业务类型为单播时，该单播业务类型可以指示MAC PDU中不携带源标识和/或目标标识；或者，TB的传输信道信息指示MAC PDU对应的业务类型为组播时，该组播业务类型可以指示MAC PDU中不携带源标识和/或目标标识；或者，TB的传输信道信息指示MAC PDU对应的业务类型为广播时，该广播业务类型可以指示MAC PDU中携带源标识和/或目标标识。
需要说明的是，本申请实施例中，上述第一信息指示的MAC PDU对应的业务类型为广播时，该MAC PDU中也可能不携带目标标识，此时，第一信息不指示MAC PDU中携带的目标标识的类型。
需要说明的是，本申请实施例中，第一信息指示MAC PDU中携带的目标标识的类型时，可以显式指示该目标标识的类型，例如，第一信息为HARQ进程信息，该HARQ进程信息为第一HARQ进程信息可以显式指示目标标识的类型为目标终端设备的标识；或者，第一信息也可以隐式指示上述目标标识的类型，例如，第一信息为HARQ进程信息，该HARQ进程信息可以指示MAC PDU的业务类型，根据MAC PDU的业务类型间接指示该目标标识的类型。
基于本申请实施例提供的通信方法，第一终端设备可以获取第一信息，该第一信息可以包括HARQ进程信息、MAC PDU头中V字段的信息、专用比特指示信息、上述TB的传输信道的信息中的一种。该第一信息指示第一终端设备接收到的TB中MAC PDU对应的业务类型，或者，该第一信息指示MAC PDU中携带的目标标识的类型，或者，该第一信息指示MAC PDU中是否携带源标识和/或目标标识，因此可以区分MAC PDU对应的业务类型，和/或MAC PDU的格式，从而使第一终端设备可以根据不同的业务类型和/或MAC PDU的格式进行相应的后续处理。
其中，上述步骤S801至S803中的第一终端设备的动作可以由图6所示的终端设备60中的处理器601调用存储器603中存储的应用程序代码以指令该终端设备执行，本实施例对此不作任何限制。
可以理解的是，以上各个实施例中，由终端设备(包括第一终端设备和第二终端设备)实现的方法和/或步骤，也可以由可用于终端设备的部件(例如芯片或者电路)实现。
上述主要从各个网元之间交互的角度对本申请实施例提供的方案进行了介绍。相应的，本申请实施例还提供了通信装置，该通信装置用于实现上述各种方法。该通信装置可以为上述方法实施例中的终端设备(包括第一终端设备和第二终端设备)，或者包含上述终端设备的装置，或者为可用于终端设备的部件。可以理解的是，该通信装置为了实现上述功能，其包含了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，本申请能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，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。
本申请实施例可以根据上述方法实施例中对通信装置进行功能模块的划分，例如，可以对应各个功能划分各个功能模块，也可以将两个或两个以上的功能集成在一个处理模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。需要说明的是，本申请实施例中对模块的划分是示意性的，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。
比如，以通信装置为上述方法实施例中的第一终端设备为例。图10示出了一种第一终端设备100的结构示意图。该终端设备100包括处理模块1001和收发模块1002。所述收发模块1002，也可以称为收发单元用以实现发送和/或接收功能，例如可以是收发电路，收发机，收发器或者通信接口。
其中，一种可能的实现方式中，处理模块1001，用于通过收发模块1002接收来自第二终端设备的侧行链路控制信息SCI；处理模块1001，还用于通过收发模块1002接收来自第二终端设备的传输块TB，其中，该TB中包括层2 PDU。
可选的，处理模块1001，还用于根据第一目标标识确定所述TB对应的业务类型。
可选的，处理模块1001，还用于根据第二目标标识确定第三目标标识的类型。
可选的，处理模块1001，还用于根据第二目标标识确定第三目标标识的类型，包括：处理模块1001，还用于上述TB对应的业务类型为单播，确定所述第三目标标识的类型为目标终端设备的标识；或者，处理模块1001，还用于上述TB对应的业务类型为组播，确定所述第三目标标识的类型为目标组标识；或者，处理模块1001，还用于上述TB对应的业务类型为广播，确定所述第三目标标识的类型为目标服务标识。
其中，另一种可能的实现方式中，处理模块1001，用于通过收发模块1002接收来自第二终端设备的传输块TB，其中，该TB中包括MAC PDU。
处理模块1001，还用于获取第一信息，其中，该第一信息包括以下信息中的一种：HARQ进程信息、MAC PDU头中V字段的信息、专用比特指示信息、上述TB的传输信道的信息；该第一信息用于指示上述MAC PDU中携带的目标标识的类型，或者，该第一信息用于指示该MAC PDU对应的业务类型，或者，该第一信息用于指示MAC PDU中携带源标识和/或目标标识，或者，该第一信息用于指示MAC PDU中不携带源标识和/或目标标识。
处理模块1001，还用于确定MAC PDU携带的目标标识的类型，或者MAC PDU对应的业务类型，或者MAC PDU是否携带源标识和/或目标标识。
本申请实施例中，处理模块1001用于通过收发模块1002接收上述信息或消息可以理解为，收发模块1002接收外界发送的携带上述信息或消息的信号之后，经过或者不经过信号处理发送给处理模块1001处理。在此统一说明，以下不再赘述。
其中，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能 描述，在此不再赘述。
在本实施例中，该第一终端设备100以采用集成的方式划分各个功能模块的形式来呈现。这里的“模块”可以指特定ASIC，电路，执行一个或多个软件或固件程序的处理器和存储器，集成逻辑电路，和/或其他可以提供上述功能的器件。在一个简单的实施例中，本领域的技术人员可以想到该第一终端设备100可以采用图6所示的终端设备60的形式。
比如，图6所示的终端设备60中的处理器601可以通过调用存储器603中存储的计算机执行指令，使得终端设备60执行上述方法实施例中的通信方法。
示例性的，图10中的处理模块1001和收发模块1002的功能/实现过程可以通过图6所示的终端设备60中的处理器601调用存储器603中存储的计算机执行指令来实现。或者，图10中的处理模块1001的功能/实现过程可以通过图6所示的终端设备60中的处理器601调用存储器603中存储的计算机执行指令来实现，图10中的收发模块1002的功能/实现过程可以通过图6所示的终端设备60中的通信接口604来实现。
由于本实施例提供的第一终端设备100可执行上述的通信方法，因此其所能获得的技术效果可参考上述方法实施例，在此不再赘述。
可选的，本申请实施例还提供了一种通信装置，该通信装置可以为上述任一方法实施例中的第一终端设备，比如是车载通信装置，或者包含上述第一终端设备的装置，比如各种类型的车辆，或者是上述第一终端设备中包含的装置，比如系统芯片；或者，该通信装置可以为上述任一方法实施例中的第二终端设备，比如是车载通信装置，或者包含上述第二终端设备的装置，比如各种类型的车辆，或者是上述第二终端设备中包含的装置，比如系统芯片。所述通信装置包括实现上述方法相应的模块、单元、或手段(means)，该模块、单元、或means可以通过硬件实现，软件实现，或者通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块或单元。
可选的，本申请实施例还提供了一种通信装置，包括：处理器和存储器；该存储器用于存储计算机指令，当该处理器执行该指令时，以使该通信装置执行上述任一方法实施例所述的方法。该通信装置可以为上述任一方法实施例中的第一终端设备，比如是车载通信装置，或者包含上述第一终端设备的装置，比如各种类型的车辆，或者是上述第一终端设备中包含的装置，比如系统芯片；或者，该通信装置可以为上述任一方法实施例中的第二终端设备，比如是车载通信装置，或者包含上述第二终端设备的装置，比如各种类型的车辆，或者是上述第二终端设备中包含的装置，比如系统芯片。
可选的，本申请实施例还提供了一种通信装置，包括：处理器；所述处理器用于与存储器耦合，并读取存储器中的指令之后，根据所述指令执行如上述任一方法实施例所述的方法。该通信装置可以为上述任一方法实施例中的第一终端设备，比如是车载通信装置，或者包含上述第一终端设备的装置，比如各种类型的车辆，或者是上述第一终端设备中包含的装置，比如系统芯片；或者，该通信装置可以为上述任一方法实施例中的第二终端设备，比如是车载通信装置，或者包含上述第二终端设备的装置，比如各种类型的车辆，或者是上述第二终端设备中包含的装置，比如系统芯片。
可选的，本发明实施例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，当所述指令在通信装置上运行时，使得通信装置可以执行上述任一方法实施例所述的方法。该通信装置可以为上述任一方法实施例中的第一终端设备，比如是车载通信装置，或者包含上述第一终端设备的装置，比如各种类型的车辆，或者是上述第一终端设备中包含的装置，比如系统芯片；或者，该通信装置可以为上述任一方法实施例中的第二终端设备， 比如是车载通信装置，或者包含上述第二终端设备的装置，比如各种类型的车辆，或者是上述第二终端设备中包含的装置，比如系统芯片。
可选的，本发明实施例还提供了一种包含指令的计算机程序产品，当所述指令在通信装置上运行时，使得所述通信装置可以执行上述任一方法实施例所述的方法。该通信装置可以为上述任一方法实施例中的第一终端设备，比如是车载通信装置，或者包含上述第一终端设备的装置，比如各种类型的车辆，或者是上述第一终端设备中包含的装置，比如系统芯片；或者，该通信装置可以为上述任一方法实施例中的第二终端设备，比如是车载通信装置，或者包含上述第二终端设备的装置，比如各种类型的车辆，或者是上述第二终端设备中包含的装置，比如系统芯片。
可选的，本申请实施例还提供了一种通信装置(例如，该通信装置可以是芯片或芯片系统)，该通信装置包括处理器，用于实现上述任一方法实施例中的方法。在一种可能的设计中，该通信装置还包括存储器。该存储器，用于保存必要的程序指令和数据，处理器可以调用存储器中存储的程序代码以指令该通信装置执行上述任一方法实施例中的方法。当然，存储器也可以不在该通信装置中。该通信装置是芯片系统时，可以由芯片构成，也可以包含芯片和其他分立器件，本申请实施例对此不作具体限定。
可选的，本发明实施例还提供一种通信系统，该通信系统包括上述方法实施例中的第一终端设备和第二终端设备。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件程序实现时，可以全部或部分地以计算机程序产品的形式来实现。该计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行计算机程序指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或者数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可以用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)，光介质(例如，DVD)、或者半导体介质(例如固态硬盘(solid state disk，SSD))等。本申请实施例中,计算机可以包括前面所述的装置。
尽管在此结合各实施例对本申请进行了描述，然而，在实施所要求保护的本申请过程中，本领域技术人员通过查看所述附图、公开内容、以及所附权利要求书，可理解并实现所述公开实施例的其他变化。在权利要求中，“包括”(comprising)一词不排除其他组成部分或步骤，“一”或“一个”不排除多个的情况。单个处理器或其他单元可以实现权利要求中列举的若干项功能。相互不同的从属权利要求中记载了某些措施，但这并不表示这些措施不能组合起来产生良好的效果。尽管结合具体特征及其实施例对本申请进行了描述，显而易见的，在不脱离本申请的精神和范围的情况下，可对其进行各种修改和组合。相应地，本说明书和附图仅仅是所附权利要求所界定的本申请的示例性说明，且视为已覆盖本申请范围内的任意和所有修改、变化、组合或等同物。显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (30)

  1. 一种通信方法，其特征在于，所述方法包括：
    第一终端设备接收来自第二终端设备的侧行链路控制信息SCI；
    所述第一终端设备接收来自所述第二终端设备的传输块TB，所述TB包括层2分组数据单元PDU；
    所述SCI和所述层2PDU满足如下中一种：
    所述SCI中包括第一源标识，所述层2PDU中不包括层2源标识，其中，所述第一源标识为所述层2源标识，或者，所述第一源标识为物理层源标识；或者，
    所述SCI中包括第一目标标识，所述层2PDU中不包括层2目标标识，其中，所述第一目标标识为所述层2目标标识，或者，所述第一目标标识为物理层目标标识；或者，
    所述SCI中包括第二源标识，所述层2PDU中包括第三源标识，其中，所述第二源标识为所述层2源标识中的第一比特位，所述第三源标识为所述层2源标识中除所述第一比特位之外的其他比特位；或者，
    所述SCI中包括第二目标标识，所述层2PDU中包括第三目标标识，其中，所述第二目标标识为所述层2目标标识中的第二比特位，所述第三目标标识为所述层2目标标识中除所述第二比特位之外的其他比特位；或者，
    所述SCI中不包括所述层2源标识和所述层2目标标识，所述层2PDU中包括所述层2源标识和所述层2目标标识。
  2. 根据权利要求1所述的方法，其特征在于，
    所述物理层源标识，包括根据所述层2源标识生成的源标识；或者，
    所述物理层目标标识，包括根据所述层2目标标识生成的目标标识。
  3. 根据权利要求1或2所述的方法，其特征在于，所述方法还包括：
    所述第一终端设备根据所述第一目标标识确定所述TB对应的业务类型。
  4. 根据权利要求1或2所述的方法，其特征在于，所述方法还包括：
    所述第一终端设备根据所述第二目标标识确定所述第三目标标识的类型。
  5. 根据权利要求4所述的方法，其特征在于，所述第一终端设备根据所述第二目标标识确定所述第三目标标识的类型，包括：
    所述第一终端设备根据所述第二目标标识，确定所述TB对应的业务类型；
    所述第一终端设备根据所述TB对应的业务类型，确定所述第三目标标识的类型。
  6. 根据权利要求5所述的方法，其特征在于，所述第一终端设备根据所述TB对应的业务类型，确定所述第三目标标识的类型，包括：
    所述TB对应的业务类型为单播，所述第一终端设备确定所述第三目标标识的类型为目标终端设备的标识；或者，
    所述TB对应的业务类型为组播，所述第一终端设备确定所述第三目标标识的类型为目标组标识；或者，
    所述TB对应的业务类型为广播，所述第一终端设备确定所述第三目标标识的类型为目标服务标识。
  7. 一种通信方法，其特征在于，所述方法包括：
    第一终端设备接收来自第二终端设备的传输块TB，所述TB中包括媒体接入控制分组数据单元MAC PDU；
    所述第一终端设备获取第一信息，其中，所述第一信息包括以下信息中的一种或多种： 混合自动重传请求HARQ进程信息、MAC PDU头中V字段的信息、专用比特指示信息、所述TB的传输信道的信息；
    所述第一信息用于指示所述MAC PDU中携带的目标标识的类型，或者，所述第一信息用于指示所述MAC PDU对应的业务类型，或者，所述第一信息用于指示所述MAC PDU中携带源标识和/或目标标识，或者，所述第一信息用于指示所述MAC PDU中不携带源标识和/或目标标识。
  8. 根据权利要求7所述的方法，其特征在于，
    所述HARQ进程信息为第一HARQ进程信息，所述目标标识的类型为目标终端设备的标识，和/或，所述业务类型为单播；或者，
    所述HARQ进程信息为第二HARQ进程信息，所述目标标识的类型为目标组标识，和/或，所述业务类型为组播；或者，
    所述HARQ进程信息为第三HARQ进程信息，所述目标标识的类型为目标服务标识，和/或，所述业务类型为广播。
  9. 根据权利要求7所述的方法，其特征在于，
    所述HARQ进程信息为第一HARQ进程信息，所述MAC PDU中携带所述目标标识；或者，
    所述HARQ进程信息为第二HARQ进程信息，所述MAC PDU中携带所述源标识；或者，
    所述HARQ进程信息为第三HARQ进程信息，所述MAC PDU中携带所述源标识和所述目标标识；或者，
    所述HARQ进程信息为第四HARQ进程信息，所述MAC PDU中不携带所述源标识和所述目标标识；或者，
    所述HARQ进程信息为第五HARQ进程信息，所述MAC PDU中不携带所述目标标识；或者，
    所述HARQ进程信息为第六HARQ进程信息，所述MAC PDU中不携带所述源标识。
  10. 根据权利要求7所述的方法，其特征在于，
    所述MAC PDU头中V字段为第一取值，所述目标标识的类型为目标终端设备的标识，和/或，所述业务类型为单播；或者，
    所述MAC PDU头中V字段为第二取值，所述目标标识的类型为目标组标识，和/或，所述业务类型为组播；或者，
    所述MAC PDU头中V字段为第三取值，所述目标标识的类型为目标服务标识，和/或，所述业务类型为广播。
  11. 根据权利要求7所述的方法，其特征在于，
    所述MAC PDU头中V字段为第一取值，所述MAC PDU中携带所述目标标识；或者，
    所述MAC PDU头中V字段为第二取值，所述MAC PDU中携带所述源标识；或者，
    所述MAC PDU头中V字段为第三取值，所述MAC PDU中携带所述源标识和所述目标标识；或者，
    所述MAC PDU头中V字段为第四取值，所述MAC PDU中不携带所述源标识和所述目标标识；或者，
    所述MAC PDU头中V字段为第五取值，所述MAC PDU中不携带所述目标标识；或者，
    所述MAC PDU头中V字段为第六取值，所述MAC PDU中不携带所述源标识。
  12. 根据权利要求7所述的方法，其特征在于，
    所述专用比特指示信息指示的MAC PDU头中前N个比特为第四取值，所述目标标识的类型为目标终端设备的标识，和/或，所述业务类型为单播，其中，N为正整数；或者，
    所述专用比特指示信息指示的MAC PDU头中前N个比特为第五取值，所述目标标识的类型为目标组标识，和/或，所述业务类型为组播；或者，
    所述专用比特指示信息指示的MAC PDU头中前N个比特为第六取值，所述目标标识的类型为目标服务标识，和/或，所述业务类型为广播。
  13. 根据权利要求7所述的方法，其特征在于，
    所述专用比特指示信息指示的MAC PDU头中前N个比特为第一取值，所述MAC PDU中携带所述目标标识，其中，N为正整数；或者，
    所述专用比特指示信息指示的MAC PDU头中前N个比特为第二取值，所述MAC PDU中携带所述源标识；或者，
    所述专用比特指示信息指示的MAC PDU头中前N个比特为第三取值，所述MAC PDU中携带所述源标识和所述目标标识；或者，
    所述专用比特指示信息指示的MAC PDU头中前N个比特为第四取值，所述MAC PDU中不携带所述源标识和所述目标标识；或者，
    所述专用比特指示信息指示的MAC PDU头中前N个比特为第五取值，所述MAC PDU中不携带所述目标标识；或者，
    所述专用比特指示信息指示的MAC PDU头中前N个比特为第六取值，所述MAC PDU中不携带所述源标识。
  14. 根据权利要求7所述的方法，其特征在于，
    所述TB的传输信道为侧行链路单播传输信道，所述目标标识的类型为目标终端设备的标识，和/或，所述业务类型为单播；或者，
    所述TB的传输信道为侧行链路组播传输信道，所述目标标识的类型为目标组标识，和/或，所述业务类型为组播；或者，
    所述TB的传输信道为侧行链路广播传输信道，所述目标标识的类型为目标服务标识，和/或，所述业务类型为广播。
  15. 根据权利要求7所述的方法，其特征在于，
    所述TB的传输信道的信息为第一传输信道信息，所述MAC PDU中携带所述目标标识；或者，
    所述TB的传输信道的信息为第二传输信道信息，所述MAC PDU中携带所述源标识；或者，
    所述TB的传输信道的信息为第三传输信道信息，所述MAC PDU中携带所述源标识和所述目标标识；或者，
    所述TB的传输信道的信息为第四传输信道信息，所述MAC PDU中不携带所述源标识和所述目标标识；或者，
    所述TB的传输信道的信息为第五传输信道信息，所述MAC PDU中不携带所述目标标识；或者，
    所述TB的传输信道的信息为第六传输信道信息，所述MAC PDU中不携带所述源标识。
  16. 一种通信装置，其特征在于，所述通信装置包括：处理模块和收发模块；
    所述处理模块，用于通过所述收发模块接收来自第二终端设备的侧行链路控制信息SCI；
    所述处理模块，还用于通过所述收发模块接收来自所述第二终端设备的传输块TB，所述TB包括层2分组数据单元PDU；
    所述SCI和所述层2PDU满足如下中一种：
    所述SCI中包括第一源标识，所述层2PDU中不包括层2源标识，其中，所述第一源标识为所述层2源标识，或者，所述第一源标识为物理层源标识；或者，
    所述SCI中包括第一目标标识，所述层2PDU中不包括层2目标标识，其中，所述第一目标标识为所述层2目标标识，或者，所述第一目标标识为物理层目标标识；或者，
    所述SCI中包括第二源标识，所述层2PDU中包括第三源标识，其中，所述第二源标识为所述层2源标识中的第一比特位，所述第三源标识为所述层2源标识中除所述第一比特位之外的其他比特位；或者，
    所述SCI中包括第二目标标识，所述层2PDU中包括第三目标标识，其中，所述第二目标标识为所述层2目标标识中的第二比特位，所述第三目标标识为所述层2目标标识中除所述第二比特位之外的其他比特位；或者，
    所述SCI中不包括所述层2源标识和所述层2目标标识，所述层2PDU中包括所述层2源标识和所述层2目标标识。
  17. 根据权利要求16所述的通信装置，其特征在于，所述物理层源标识，包括根据所述层2源标识生成的源标识；或者，
    所述物理层目标标识，包括根据所述层2目标标识生成的目标标识。
  18. 根据权利要求16或17所述的通信装置，其特征在于，所述处理模块，还用于根据所述第一目标标识确定所述TB对应的业务类型。
  19. 根据权利要求16或17所述的通信装置，其特征在于，所述处理模块，还用于根据所述第二目标标识确定所述第三目标标识的类型。
  20. 根据权利要求19所述的通信装置，其特征在于，所述处理模块，还用于根据所述第二目标标识确定所述第三目标标识的类型，包括：
    所述处理模块，用于根据所述第二目标标识，确定所述TB对应的业务类型；根据所述TB对应的业务类型，确定所述第三目标标识的类型。
  21. 根据权利要求20所述的通信装置，其特征在于，所述处理模块，还用于根据所述TB对应的业务类型，确定所述第三目标标识的类型，包括：
    所述处理模块，还用于所述TB对应的业务类型为单播，确定所述第三目标标识的类型为目标终端设备的标识；或者，
    所述处理模块，还用于所述TB对应的业务类型为组播，确定所述第三目标标识的类型为目标组标识；或者，
    所述处理模块，还用于所述TB对应的业务类型为广播，确定所述第三目标标识的类型为目标服务标识。
  22. 一种通信装置，其特征在于，所述通信装置包括：处理模块和收发模块；
    所述处理模块，用于通过所述收发模块接收来自第二终端设备的传输块TB，所述TB中包括媒体接入控制分组数据单元MAC PDU；
    所述处理模块，还用于获取第一信息，其中，所述第一信息包括以下信息中的一种或多种：混合自动重传请求HARQ进程信息、MAC PDU头中V字段的信息、专用比特指示信息、所述TB的传输信道的信息；
    所述第一信息用于指示所述MAC PDU中携带的目标标识的类型，或者，所述第一信息 用于指示所述MAC PDU对应的业务类型，或者，所述第一信息用于指示所述MAC PDU中携带源标识和/或目标标识，或者，所述第一信息用于指示所述MAC PDU中不携带源标识和/或目标标识。
  23. 根据权利要求22所述的通信装置，其特征在于，
    所述HARQ进程信息为第一HARQ进程信息，所述目标标识的类型为目标终端设备的标识，和/或，所述业务类型为单播；或者，
    所述HARQ进程信息为第二HARQ进程信息，所述目标标识的类型为目标组标识，和/或，所述业务类型为组播；或者，
    所述HARQ进程信息为第三HARQ进程信息，所述目标标识的类型为目标服务标识，和/或，所述业务类型为广播。
  24. 根据权利要求22所述的通信装置，其特征在于，
    所述HARQ进程信息为第一HARQ进程信息，所述MAC PDU中携带所述目标标识；或者，
    所述HARQ进程信息为第二HARQ进程信息，所述MAC PDU中携带所述源标识；或者，
    所述HARQ进程信息为第三HARQ进程信息，所述MAC PDU中携带所述源标识和所述目标标识；或者，
    所述HARQ进程信息为第四HARQ进程信息，所述MAC PDU中不携带所述源标识和所述目标标识；或者，
    所述HARQ进程信息为第五HARQ进程信息，所述MAC PDU中不携带所述目标标识；或者，
    所述HARQ进程信息为第六HARQ进程信息，所述MAC PDU中不携带所述源标识。
  25. 根据权利要求22所述的通信装置，其特征在于，
    所述MAC PDU头中V字段为第一取值，所述目标标识的类型为目标终端设备的标识，和/或，所述业务类型为单播；或者，
    所述MAC PDU头中V字段为第二取值，所述目标标识的类型为目标组标识，和/或，所述业务类型为组播；或者，
    所述MAC PDU头中V字段为第三取值，所述目标标识的类型为目标服务标识，和/或，所述业务类型为广播。
  26. 根据权利要求22所述的通信装置，其特征在于，
    所述MAC PDU头中V字段为第一取值，所述MAC PDU中携带所述目标标识；或者，
    所述MAC PDU头中V字段为第二取值，所述MAC PDU中携带所述源标识；或者，
    所述MAC PDU头中V字段为第三取值，所述MAC PDU中携带所述源标识和所述目标标识；或者，
    所述MAC PDU头中V字段为第四取值，所述MAC PDU中不携带所述源标识和所述目标标识；或者，
    所述MAC PDU头中V字段为第五取值，所述MAC PDU中不携带所述目标标识；或者，
    所述MAC PDU头中V字段为第六取值，所述MAC PDU中不携带所述源标识。
  27. 根据权利要求22所述的通信装置，其特征在于，
    所述专用比特指示信息指示的MAC PDU头中前N个比特为第四取值，所述目标标识的类型为目标终端设备的标识，和/或，所述业务类型为单播，其中，N为正整数；或者，
    所述专用比特指示信息指示的MAC PDU头中前N个比特为第五取值，所述目标标识的类型为目标组标识，和/或，所述业务类型为组播；或者，
    所述专用比特指示信息指示的MAC PDU头中前N个比特为第六取值，所述目标标识的类型为目标服务标识，和/或，所述业务类型为广播。
  28. 根据权利要求22所述的通信装置，其特征在于，
    所述专用比特指示信息指示的MAC PDU头中前N个比特为第一取值，所述MAC PDU中携带所述目标标识，其中，N为正整数；或者，
    所述专用比特指示信息指示的MAC PDU头中前N个比特为第二取值，所述MAC PDU中携带所述源标识；或者，
    所述专用比特指示信息指示的MAC PDU头中前N个比特为第三取值，所述MAC PDU中携带所述源标识和所述目标标识；或者，
    所述专用比特指示信息指示的MAC PDU头中前N个比特为第四取值，所述MAC PDU中不携带所述源标识和所述目标标识；或者，
    所述专用比特指示信息指示的MAC PDU头中前N个比特为第五取值，所述MAC PDU中不携带所述目标标识；或者，
    所述专用比特指示信息指示的MAC PDU头中前N个比特为第六取值，所述MAC PDU中不携带所述源标识。
  29. 根据权利要求22所述的通信装置，其特征在于，
    所述TB的传输信道为侧行链路单播传输信道，所述目标标识的类型为目标终端设备的标识，和/或，所述业务类型为单播；或者，
    所述TB的传输信道为侧行链路组播传输信道，所述目标标识的类型为目标组标识，和/或，所述业务类型为组播；或者，
    所述TB的传输信道为侧行链路广播传输信道，所述目标标识的类型为目标服务标识，和/或，所述业务类型为广播。
  30. 根据权利要求22所述的通信装置，其特征在于，
    所述TB的传输信道的信息为第一传输信道信息，所述MAC PDU中携带所述目标标识；或者，
    所述TB的传输信道的信息为第二传输信道信息，所述MAC PDU中携带所述源标识；或者，
    所述TB的传输信道的信息为第三传输信道信息，所述MAC PDU中携带所述源标识和所述目标标识；或者，
    所述TB的传输信道的信息为第四传输信道信息，所述MAC PDU中不携带所述源标识和所述目标标识；或者，
    所述TB的传输信道的信息为第五传输信道信息，所述MAC PDU中不携带所述目标标识；或者，
    所述TB的传输信道的信息为第六传输信道信息，所述MAC PDU中不携带所述源标识。
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