WO2023093364A1 - 一种通信方法和装置 - Google Patents

一种通信方法和装置 Download PDF

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Publication number
WO2023093364A1
WO2023093364A1 PCT/CN2022/125620 CN2022125620W WO2023093364A1 WO 2023093364 A1 WO2023093364 A1 WO 2023093364A1 CN 2022125620 W CN2022125620 W CN 2022125620W WO 2023093364 A1 WO2023093364 A1 WO 2023093364A1
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WIPO (PCT)
Prior art keywords
indication information
data
status report
terminal device
network device
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PCT/CN2022/125620
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English (en)
French (fr)
Inventor
许斌
李秉肇
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华为技术有限公司
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Publication of WO2023093364A1 publication Critical patent/WO2023093364A1/zh

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    • 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
    • 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
    • H04L1/1607—Details of the supervisory signal
    • 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
    • H04L1/1809—Selective-repeat protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/06—Notations for structuring of protocol data, e.g. abstract syntax notation one [ASN.1]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/22—Parsing or analysis of headers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services

Definitions

  • the embodiments of the present application relate to the communication field, and more specifically, to a communication method and device.
  • Multicast broadcast service (multicast and broadcast service, MBS) is a service for multiple terminals at the same time.
  • MBS multicast and broadcast service
  • Using multicast or broadcast transmission mode can provide MBS services for a large number of users at the same time with less resources, such as live broadcast services, public safety services, Batch software update business, etc.
  • the data of the MBS service comes from the data server, is sent to the access network device via the core network device, and then is sent by the access network device to at least one terminal device receiving MBS data.
  • some services have high requirements on data reliability. For example, in industrial scenarios or batch terminal device software update services, data packet loss will cause software update failure, which requires re-update. Indeed affect the reliability of service transmission.
  • Embodiments of the present application provide a communication method and device, and a terminal device can give feedback on a receiving status of multicast data, which helps to improve the reliability of data transmission.
  • a communication method is provided, and the method may be executed by a network device, or may also be executed by a component (for example, a chip or a circuit) configured on the network device, which is not limited in the present application.
  • a component for example, a chip or a circuit
  • the method includes: determining first indication information, the first indication information is used to request a first status report of the terminal equipment, the first status report is used to indicate whether the first data is successfully received, and the first data is transmitted through point-to-multiple Data sent to the terminal device in a point to multi-point (PTM) transmission mode; sending the first indication information to the terminal device in a point to point (PTP) transmission mode.
  • PTM point to multi-point
  • PTP point to point
  • the first indication information may also be referred to as first request information or polling (polling) information, which is used to request a first status report from the terminal device, or, in other words, to poll or query the first status of the terminal device
  • the report is used to trigger the first status report of the terminal device, or to instruct the terminal device to send the first status report, or to enable the terminal device to report the first status report, and the like.
  • the first status report is used to indicate whether the first data is successfully received, that is, the first status report can be used to indicate the receiving status of the first data, and the receiving status includes successful reception and unsuccessful reception (or failure to receive), certain data
  • the packet "successfully received” can be understood as the feedback content corresponding to the sequence number of the data packet in the first status report is (acknowledgment, ACK) information, and the "unsuccessfully received" of a certain data packet can be understood as the data in the first status report
  • the feedback content corresponding to the serial number of the package is (negative acknowledgment, NACK) information.
  • the network device sends the first indication information to the terminal device through PTP transmission, the first indication information is used to request the first status report of the terminal device, and the first status report is used to indicate the Whether the first data is successfully received, the terminal device may feed back the receiving status of the first data according to the first indication information.
  • the network device may perform retransmission, which helps to improve the reliability of data transmission.
  • the first indication information is sent through the PTP transmission mode, which can support requesting the first status report to all or some of the terminal devices receiving the MBS service, for example, for the network device that does not need feedback
  • the terminal device may not request the receiving status of the first data, which helps to reduce unnecessary signaling overhead, and also improves the flexibility of network device regulation.
  • the first indication information is carried in at least one of the following: radio resource control (radio resource control, RRC) signaling, packet data convergence protocol (packet data convergence protocol) , PDCP) control protocol data unit (protocol data unit, PDU), radio link control (radio link control, RLC) control PDU, media access control control element (media access control control element, MAC CE) or downlink control information ( downlink control information, DCI).
  • RRC radio resource control
  • RRC radio resource control
  • packet data convergence protocol packet data convergence protocol
  • PDCP packet data convergence protocol
  • PDU protocol data unit
  • radio link control radio link control
  • media access control control element media access control control element
  • MAC CE media access control control element
  • DCI downlink control information
  • the first indication information may be dedicated control information, for example, carried by fields or bits in RRC signaling, PDCP control PDU, RLC control PDU, MAC CE or DCI.
  • the first indication information may be carried by a variety of different Message sending, with greater flexibility.
  • the aforementioned sending the first indication information to the terminal device through the PTP transmission method includes: sending the second data to the terminal device through the PTP transmission method, the second data carrying the The first instruction message.
  • the data packet sent by the network device through the PTP transmission path may carry the first indication information.
  • the second data is an RLC unacknowledged mode data (unacknowledged mode data, UMD) PDU, and the header of the second data includes the first indication information; or,
  • the second data is an RLC acknowledged mode data (acknowledged mode data, AMD) PDU, the packet header of the second data includes the first indication information and the second indication information, and the second indication information is used to request the second state of the terminal device report, the second status report is used to indicate whether the second data is successfully received; or, the second data is RLC AMD PDU, the packet header of the second data includes third indication information, and the third indication information is used to indicate the second
  • the extension field includes the first indication information and the second indication information
  • the second indication information is used to request a second status report of the terminal device
  • the second status report is used to indicate whether the second data Received successfully.
  • the signaling overhead of the terminal device and the network device can be reduced by using the second data in the PTP transmission path to carry the first indication information.
  • the method further includes: receiving a first status report; and/or determining whether to retransmit the first data according to the first status report.
  • the network device can perform retransmission, which helps to improve the reliability of data transmission.
  • the method further includes: sending sixth indication information to the terminal device, where the sixth indication information is used to indicate a data packet format of the second data.
  • the network device may indicate the data packet format of the second data, so that the terminal device can parse the second data.
  • a communication method is provided, and the method may be executed by a terminal device, or may also be executed by a component (such as a chip or a circuit) of the terminal device, which is not limited thereto.
  • the method includes: receiving first indication information through PTP transmission, the first indication information is used to request a first status report of the terminal device, the first status report is used to indicate whether the first data is successfully received, and the first data is The data received from the network device through PTM transmission; sending the first status report to the network device according to the first indication information.
  • the network device sends the first indication information to the terminal device through PTP transmission, the first indication information is used to request the first status report of the terminal device, and the first status report is used to indicate the Whether the first data is successfully received, the terminal device may give feedback on the receiving status of the first data according to the first indication information.
  • the network device may re- transmission, which helps to improve the reliability of data transmission.
  • the first indication information is sent through the PTP transmission mode, which can support requesting the first status report to all or some of the terminal devices receiving the MBS service, for example, for the network device that does not need feedback
  • the terminal device may not request the receiving status of the first data, which helps to reduce unnecessary signaling overhead, and also improves the flexibility of network device regulation.
  • the first indication information is carried in at least one of the following: RRC signaling, PDCP control PDU, RLC control PDU, MAC CE or DCI.
  • the first indication information may be dedicated control information, for example, carried by fields or bits in RRC signaling, PDCP control PDU, RLC control PDU, MAC CE or DCI.
  • the first indication information may be carried by a variety of different Message sending, with greater flexibility.
  • the receiving the first indication information through PTP transmission includes: receiving second data from the network device through PTP transmission, the second data carrying the first 1. Instructions.
  • the data packet sent by the network device through the PTP transmission path may carry the first indication information.
  • the second data is an RLC UMD PDU, and the packet header of the second data includes the first indication information; or, the second data is an RLC AMD PDU, and the The packet header of the second data includes the first indication information and the second indication information, the second indication information is used to request a second status report of the terminal device, and the second status report is used to indicate whether the second data is successfully received; or,
  • the second data is an RLC AMD PDU, the header of the second data includes third indication information, and the third indication information is used to indicate that there is an extension field in the header of the second data, and the extension field includes the first indication information and the second indication information.
  • indication information where the second indication information is used to request a second status report of the terminal device, where the second status report is used to indicate whether the second data is received successfully.
  • the signaling overhead of the terminal device and the network device can be reduced by using the second data in the PTP transmission path to carry the first indication information.
  • the method further includes: receiving sixth indication information, where the sixth indication information is used to indicate a data packet format of the second data.
  • the network device may indicate the data packet format of the second data, so that the terminal device can parse the second data.
  • a communication method is provided, and the method may be executed by a network device, or may also be executed by a component (such as a chip or a circuit) of the network device, which is not limited thereto.
  • the method includes: determining first indication information, the first indication information is used to request a first status report of the terminal device, and the first status report is used to indicate whether the first data is successfully received; sending the terminal device through PTM transmission First data, where the first data carries the first indication information.
  • the network device sends first data to the terminal device through PTM transmission, the first data carries first indication information, and the first indication information is used to request the first status report of the terminal device, the first The status report is used to indicate whether the first data is successfully received, and the terminal device may further determine whether to send the first status report to the network device.
  • the network device can obtain the first status report, and if the first status report indicates that the receiving status of the first data is failure, the network device can retransmit, which helps to improve the reliability of data transmission.
  • the first indication information is carried in the first data and sent to the terminal device together with the first data, which can reduce signaling overhead and waste of resources.
  • the terminal device includes a first terminal device, and the method further includes: sending fourth indication information to the first terminal device, where the fourth indication information is used to indicate that the first terminal device A terminal device does not respond to the first indication information; or, sending fifth indication information to the first terminal device, where the fifth indication information is used to instruct the first terminal device to respond to the first indication information.
  • not responding can be understood as ignoring or stopping the response
  • not responding to the first indication information can be understood as ignoring the polling (polling, P) domain in the packet header of the first data or not sending the first status report
  • response to the first indication information can be understood as parsing the P field in the header of the first data, or determining to send the first status report according to the first indication information.
  • the fourth indication information and the fifth indication information may be two different indication information, or may be different values of the same indication information, for example, when the value is 1, it represents the fourth indication information, and the value When it is 0, it represents the fifth indication information.
  • the fourth indication information or the fifth indication information is carried in at least one of the following: RRC signaling, PDCP control protocol data unit PDU, RLC control PDU, MAC CE or DCI.
  • the fourth indication information and the fifth indication information may be dedicated control information, for example, carried by fields or bits in RRC signaling, PDCP control PDU, RLC control PDU, MAC CE or DCI, in other words, the fourth indication information and The fifth indication information can be sent through a variety of different messages, which has greater flexibility.
  • fourth indication information and the fifth indication information may be carried in the same message or in different messages, which is not limited in this application.
  • the network device when the network device sends the first data and the first indication information to the terminal equipment through the PTM transmission mode, it can further send the fourth indication information or the fifth indication information to the first terminal equipment, indicating that the first The terminal device responds or does not respond to the first indication information.
  • all or some of the terminal devices that receive the MBS service can feed back the receiving status of the first data, and for the terminal devices that the network device thinks does not need feedback, it can be made not to feed back the receiving status of the first data, It helps to reduce unnecessary signaling overhead, and can also improve the flexibility of network device regulation.
  • the method further includes: receiving the first status report; and/or, determining whether to retransmit the first data according to the first status report.
  • the network device can perform retransmission when it knows that the first data has failed to receive, which helps to improve the reliability of data transmission.
  • a communication method is provided, and the method may be executed by a terminal device, or may also be executed by components (such as a chip or a circuit) of the terminal device, which is not limited thereto.
  • the method includes: receiving first data through PTM transmission, the first data carrying first indication information, the first indication information is used to request a first status report of the terminal equipment, and the first status report is used to indicate the first data Whether the reception is successful; determine whether to send the first status report to the network device.
  • the network device sends first data to the terminal device through PTM transmission, the first data carries first indication information, and the first indication information is used to request the first status report of the terminal device, the first The status report is used to indicate whether the first data is successfully received, and the terminal device may further determine whether to send the first status report to the network device.
  • the network device can obtain the first status report, and if the first status report indicates that the receiving status of the first data is failure, the network device can retransmit, which helps to improve the reliability of data transmission.
  • the first indication information is carried in the first data and sent to the terminal device together with the first data, which can reduce signaling overhead and resource waste of the terminal device and network device.
  • the aforementioned determining whether to send the first status report to the network device includes: determining whether to configure the first radio link control RLC entity according to the first indication information and whether The first status report is sent to the network device, and the first RLC entity corresponds to a PTP transmission mode.
  • the terminal device can decide whether to feed back the first status report according to its own configuration, which helps to reduce the communication overhead and resource waste between the terminal device and the network device.
  • the foregoing determination of whether to send the first status report to the network device according to the first indication information and whether the first RLC entity is configured includes: when the first RLC entity is configured When the first RLC entity is configured, the first status report is not sent to the network device; when the first RLC entity is not configured, the first status report is sent to the network device according to the first indication information.
  • the solution of the present application enables the terminal device to know whether to feed back the status report of the first data to the network device, which has higher flexibility.
  • the aforementioned determining whether to send the first status report to the network device includes: determining not to send the first status report to the network device according to the fourth indication information from the network device report, the fourth indication information is used to indicate not to respond to the first indication information; or, according to the first indication information and fifth indication information from the network device, it is determined to send the first status report to the network device, and the fifth indication information Used to indicate response to the first indication information.
  • not responding can be understood as ignoring or stopping the response
  • not responding to the first indication information can be understood as ignoring the polling (polling, P) domain in the packet header of the first data or not sending the first status report
  • response to the first indication information can be understood as parsing the P field in the header of the first data, or determining to send the first status report according to the first indication information.
  • the network device when the network device sends the first data and the first indication information to the terminal equipment through the PTM transmission mode, it can further send the fourth indication information or the fifth indication information to the first terminal equipment, indicating that the first The terminal device responds or does not respond to the first indication information.
  • all or some of the terminal devices receiving the MBS service can feed back the receiving status of the first data. For example, for a terminal device that the network device considers does not need feedback, it can be made not to feed back the receiving status of the first data. State, in this way, helps to reduce unnecessary signaling overhead, and can also improve the flexibility of network device regulation.
  • the fourth indication information or the fifth indication information is carried in at least one of the following: RRC signaling, PDCP control protocol data unit PDU, RLC control PDU, MAC CE or DCI.
  • a communication device configured to execute the method provided in the first aspect above.
  • the communication device may include a unit and/or module, such as a processing unit and/or a communication unit, configured to execute the first aspect or the method provided by any of the above-mentioned implementation manners of the first aspect.
  • the communication device is a network device.
  • the communication unit may be a transceiver, or an input/output interface; the processing unit may be at least one processor.
  • the transceiver may be a transceiver circuit.
  • the input/output interface may be an input/output circuit.
  • the communication device is a chip, a chip system or a circuit in a network device.
  • the communication unit may be an input/output interface, interface circuit, output circuit, input circuit, pin or related circuit on the chip, chip system or circuit, etc.
  • the processing unit may be at least one processor, processing circuit or logic circuit, etc.
  • a communication device is provided, and the device is configured to execute the method provided in the second aspect above.
  • the communication device may include a unit and/or module, such as a processing unit and/or a communication unit, for performing the second aspect or the method provided by any of the above-mentioned implementation manners of the second aspect.
  • the communication device is a terminal device.
  • the communication unit may be a transceiver, or an input/output interface; the processing unit may be at least one processor.
  • the transceiver may be a transceiver circuit.
  • the input/output interface may be an input/output circuit.
  • the communication device is a chip, a chip system or a circuit in a terminal device.
  • the communication unit may be an input/output interface, interface circuit, output circuit, input circuit, pin or related circuit on the chip, chip system or circuit, etc.
  • the processing unit may be at least one processor, processing circuit or logic circuit, etc.
  • a communication device is provided, and the device is configured to execute the method provided in the third aspect above.
  • the communication device may include a unit and/or module, such as a processing unit and/or a communication unit, for performing the third aspect or the method provided by any of the above implementation manners of the third aspect.
  • the communication device is a network device.
  • the communication unit may be a transceiver, or an input/output interface; the processing unit may be at least one processor.
  • the transceiver may be a transceiver circuit.
  • the input/output interface may be an input/output circuit.
  • the communication device is a chip, a chip system or a circuit in a network device.
  • the communication unit may be an input/output interface, interface circuit, output circuit, input circuit, pin or related circuit on the chip, chip system or circuit, etc.
  • the processing unit may be at least one processor, processing circuit or logic circuit, etc.
  • a communication device is provided, and the communication device is configured to execute the method provided in the fourth aspect above.
  • the communication device may include a unit and/or module, such as a processing unit and/or a communication unit, for performing the fourth aspect or the method provided by any of the above-mentioned implementation manners of the fourth aspect.
  • the communication device is a terminal device.
  • the communication unit may be a transceiver, or an input/output interface; the processing unit may be at least one processor.
  • the transceiver may be a transceiver circuit.
  • the input/output interface may be an input/output circuit.
  • the communication device is a chip, a chip system or a circuit in a terminal device.
  • the communication unit may be an input/output interface, interface circuit, output circuit, input circuit, pin or related circuit on the chip, chip system or circuit, etc.
  • the processing unit may be at least one processor, processing circuit or logic circuit, etc.
  • a communication device in a ninth aspect, includes: at least one processor, the at least one processor is coupled to at least one memory, the at least one memory is used to store computer programs or instructions, and the at least one processor is used to read from the at least one memory
  • the computer program or instruction is invoked and executed in the communication device, so that the communication device executes the method in the first aspect or any possible implementation manner thereof.
  • the apparatus is a network device.
  • the communication device is a chip, a chip system or a circuit in a network device.
  • a communication device in a tenth aspect, includes: at least one processor, the at least one processor is coupled to at least one memory, the at least one memory is used to store computer programs or instructions, and the at least one processor is used to read from the at least one memory
  • the computer program or instruction is invoked and executed in the communication device, so that the communication device executes the method in the second aspect or any possible implementation manner thereof.
  • the apparatus is a terminal device.
  • the apparatus is a chip, a chip system, or a circuit in a terminal device.
  • a communication device in an eleventh aspect, includes: at least one processor, the at least one processor is coupled to at least one memory, the at least one memory is used to store computer programs or instructions, and the at least one processor is used to obtain from at least one The computer program or instruction is invoked and executed in the memory, so that the communication device executes the method in the third aspect or any possible implementation thereof.
  • the apparatus is a network device.
  • the communication device is a chip, a chip system or a circuit in a network device.
  • a communication device in a twelfth aspect, includes: at least one processor, at least one processor is coupled with at least one memory, at least one memory is used to store computer programs or instructions, and at least one processor is used to obtain from at least one The computer program or instruction is invoked and executed in the memory, so that the communication device executes the method in the fourth aspect or any possible implementation thereof.
  • the apparatus is a terminal device.
  • the apparatus is a chip, a chip system, or a circuit in a terminal device.
  • the present application provides a processor configured to execute the method provided in the foregoing aspects.
  • the processor's output and reception, input and other operations can also be understood as the sending and receiving operations performed by the radio frequency circuit and the antenna, which is not limited in this application.
  • a computer-readable storage medium stores program code for device execution, and the program code includes the above-mentioned first aspect or any one of the above-mentioned implementations of the first aspect method, the second aspect or any of the above-mentioned implementations of the second aspect, the third aspect or any of the above-mentioned implementations of the third aspect, or the fourth aspect or any of the above-mentioned implementations of the fourth aspect. .
  • a computer program product containing instructions.
  • the computer program product When the computer program product is run on a computer, it causes the computer to execute the above first aspect or any one of the above implementations of the first aspect, the second aspect or the first aspect.
  • the method provided by any of the above-mentioned implementations of the second aspect, the third aspect or any of the above-mentioned implementations of the third aspect, or the fourth aspect or any of the above-mentioned implementations of the fourth aspect.
  • a sixteenth aspect provides a chip, the chip includes a processor and a communication interface, the processor reads the instructions stored in the memory through the communication interface, and executes the above-mentioned first aspect or any of the above-mentioned implementation methods of the first aspect, the second The method provided by the third aspect or any of the above-mentioned implementation manners of the second aspect, the third aspect or any of the above-mentioned implementation manners of the third aspect, or the fourth aspect or any of the above-mentioned implementation manners of the fourth aspect.
  • the chip further includes a memory, in which computer programs or instructions are stored, and the processor is used to execute the computer programs or instructions stored in the memory, and when the computer programs or instructions are executed, the processor is used to execute
  • the processor is used to execute
  • a seventeenth aspect provides a communication system, the communication system includes the communication devices shown in the fifth aspect and the sixth aspect, or includes the communication devices shown in the seventh aspect and the eighth aspect.
  • Fig. 1 is a schematic diagram of a communication system applicable to the embodiment of the present application.
  • Fig. 2 is a schematic diagram of a system architecture applicable to the method provided by the embodiment of the present application.
  • Fig. 3 is a schematic diagram of the data transmission process at each layer of the protocol stack provided by the embodiment of the present application.
  • FIG. 4 is a schematic diagram of a protocol stack architecture provided by an embodiment of the present application.
  • Fig. 5 is a schematic diagram of a communication method provided by an embodiment of the present application.
  • Fig. 6 is a schematic diagram of the format of some downlink UMD PDUs provided by the embodiment of the present application.
  • Fig. 7 is a schematic diagram of the format of some downlink AMD PDUs provided by the embodiment of the present application.
  • Fig. 8 is another schematic diagram of the format of some downlink AMD PDUs provided by the embodiment of the present application.
  • Fig. 9 is a schematic diagram of the format of some uplink AMD PDUs provided by the embodiment of the present application.
  • FIG. 10 is another schematic diagram of a communication method provided by an embodiment of the present application.
  • Fig. 11 is a schematic block diagram of a communication device provided in this application.
  • Fig. 12 is a schematic structural diagram of a communication device provided in the present application.
  • the technical solution of the embodiment of the present application can be applied to various communication systems, such as: Global System of Mobile communication (Global System of Mobile communication, GSM) system, code division multiple access (Code Division Multiple Access, CDMA) system, broadband code division multiple access (Wideband Code Division Multiple Access, WCDMA) system, general packet radio service (General Packet Radio Service, GPRS), long term evolution (Long Term Evolution, LTE) system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE Time Division Duplex (TDD), Universal Mobile Telecommunications System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) Communication System, Fifth Generation (5G) Mobile communication system or new air interface (new radio, NR).
  • GSM Global System of Mobile communication
  • CDMA code division multiple access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE long term evolution
  • LTE frequency division duplex frequency division duplex
  • FDD frequency division duplex
  • TDD Time Division Duplex
  • the technical solution provided by this application can also be applied to machine type communication (machine type communication, MTC), inter-machine communication long-term evolution technology (long term evolution-machine, LTE-M), device-to-device (device-to-device, D2D) A network, a machine to machine (M2M) network, an Internet of things (IoT) network, or other networks.
  • MTC machine type communication
  • LTE-M long term evolution-machine
  • D2D device-to-device
  • M2M machine to machine
  • IoT Internet of things
  • the IoT network may include, for example, the Internet of Vehicles.
  • the communication methods in the Internet of Vehicles system are collectively referred to as vehicle to other devices (vehicle to X, V2X, X can represent anything), for example, the V2X can include: vehicle to vehicle (vehicle to vehicle, V2V) communication, vehicle and Infrastructure (vehicle to infrastructure, V2I) communication, vehicle to pedestrian (vehicle to pedestrian, V2P) or vehicle to network (vehicle to network, V2N) communication, etc.
  • vehicle to vehicle vehicle to vehicle
  • V2V vehicle to vehicle
  • V2I vehicle to infrastructure
  • V2P vehicle to pedestrian
  • V2N vehicle to network
  • the technical solution provided by this application can also be applied to future communication systems, such as the sixth generation (6th Generation, 6G) mobile communication system and the like. This application is not limited to this.
  • FIG. 1 a communication system applicable to the embodiment of the present application is briefly introduced first with reference to FIG. 1 .
  • FIG. 1 is a schematic diagram of a communication system applicable to an embodiment of the present application.
  • the mobile communication system 100 may include at least one network device 110 and at least one terminal device (such as terminal devices 120 , 130 , 140 , 150 , 160 shown in FIG. 1 ).
  • the terminal device is connected to the network device in a wireless manner, at least one terminal device can send uplink data or information to the network device, and the network device 110 can also send downlink data or information to at least one terminal device.
  • a plurality of terminal devices can also form a communication system, for example, terminal devices 140, 150, and 160 can form a communication system, and terminal device 140 can also send downlink data or information to terminal devices 150 and 160, and terminal device 150 and 160 may also send uplink data or information to terminal device 140 . Uplink and downlink data and control information can be transmitted between the terminal device and the network device.
  • a terminal device may also be called a user equipment (user equipment, UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, Terminal, wireless communication device, user agent or user device.
  • UE user equipment
  • an access terminal a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, Terminal, wireless communication device, user agent or user device.
  • a terminal device may be a device that provides voice/data connectivity to users, for example, a handheld device with a wireless connection function, a vehicle-mounted device, and the like.
  • some terminals can be: mobile phone (mobile phone), tablet computer (pad), computer with wireless transceiver function (such as notebook computer, palmtop computer, etc.), mobile internet device (mobile internet device, MID), virtual reality (virtual reality, VR) equipment, augmented reality (augmented reality, AR) equipment, wireless terminals in industrial control (industrial control), wireless terminals in self driving (self driving), wireless in remote medical (remote medical) Terminals, wireless terminals in smart grid, wireless terminals in transportation safety, wireless terminals in smart city, wireless terminals in smart home (for example, TV home appliances, smart boxes, game consoles), cellular phones, cordless phones, session initiation protocol (session initiation protocol, SIP) phones, wireless local loop (wireless local loop, WLL) stations, personal digital assistants (PDAs) ), handheld devices with wireless communication functions, computing devices or other processing devices
  • wearable devices can also be called wearable smart devices, which is a general term for the application of wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes.
  • a wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories.
  • Wearable devices are not only a hardware device, but also achieve powerful functions through software support, data interaction, and cloud interaction.
  • Generalized wearable smart devices include full-featured, large-sized, complete or partial functions without relying on smartphones, such as smart watches or smart glasses, etc., and focus on a certain type of application functions, which need to be used in conjunction with other devices such as smartphones , such as various smart bracelets and smart jewelry for physical sign monitoring.
  • the terminal device may also be a terminal device in an Internet of Things (Internet of things, IoT) system.
  • IoT Internet of things
  • Its main technical feature is to connect objects to the network through communication technology, so as to realize the intelligent network of human-machine interconnection and object interconnection.
  • IoT technology can achieve massive connections, deep coverage, and terminal power saving through, for example, narrow band (NB) technology.
  • NB narrow band
  • the terminal device can also be a vehicle or a complete vehicle, and communication can be realized through the Internet of Vehicles, or it can be a component located in the vehicle (for example, placed in the vehicle or installed in the vehicle), that is, the vehicle terminal device , on-board module or on-board unit (OBU).
  • OBU on-board module or on-board unit
  • terminal equipment can also include sensors such as smart printers, train detectors, and gas stations.
  • the main functions include collecting data (part of terminal equipment), receiving control information and downlink data from network equipment, sending electromagnetic waves, and transmitting uplink data to network equipment. .
  • the network device may be any device with a wireless transceiver function.
  • the equipment includes but is not limited to: evolved Node B (evolved Node B, eNB), radio network controller (radio network controller, RNC), Node B (Node B, NB), base station controller (base station controller, BSC) , base transceiver station (base transceiver station, BTS), home base station (for example, home evolved NodeB, or home Node B, HNB), baseband unit (baseband unit, BBU), wireless fidelity (wireless fidelity, WiFi) system Access point (access point, AP), wireless relay node, wireless backhaul node, transmission point (transmission point, TP) or transmission and reception point (transmission and reception point, TRP), etc., can also be 5G, such as NR , a gNB in the system, or, a transmission point (TRP or TP), one or a group (including multiple antenna panels) antenna panels of a base station in a 5G
  • 5G such
  • the network device may be a radio access network device (radio access network, RAN).
  • radio access network radio access network, RAN
  • the network architecture applicable to the embodiment of the present application shown in FIG. 1 above is only an example, and the network architecture applicable to the embodiment of the present application is not limited thereto. Any network that can implement the functions of the above-mentioned network elements The architectures are applicable to the embodiments of this application.
  • the communication system 100 may further include other network devices and/or terminal devices, which are not limited in this application.
  • Multicast broadcast service (multicast and broadcast service, MBS) is a service for multiple terminals at the same time.
  • MBS Multicast broadcast service
  • Using multicast or broadcast transmission mode can provide MBS services for a large number of users with the same needs at the same time through less resources, such as live broadcast services, Public safety business, batch software update business, etc.
  • the MBS data comes from the data server, is sent to the access network device via the core network device, and then is sent by the access network device to at least one terminal device receiving the MBS data.
  • the data packet is transmitted through the MBS radio bearer.
  • An MBS radio bearer may include a point-to-multipoint (point to multi-point, PTM) transmission mode and/or a point-to-point (point to point, PTP) transmission mode.
  • PTM transmission method means that the network device sends the same data to multiple terminal devices at the same time.
  • the network device (such as a base station) has multiple terminal devices in the process of sending the same data. data is received.
  • the PTP transmission mode means that for a certain data, a network device sends independently to different terminal devices.
  • the data of the multicast broadcast service can be sent from the 5G CN to UE1, UE2, UE3 and UE4.
  • the transmission path from 5G CN to 5G RAN can be a multicast broadcast session tunnel.
  • 5G CN sends multicast broadcast service data to UE1 and UE2, and the multicast broadcast session tunnel of UE1 and UE2 is shared.
  • the RAN can send the above-mentioned multicast broadcast data to UE1 and UE2 through point-to-multipoint PTM, that is, send a copy of data, and both UEs can receive it.
  • the RAN may also send the above multicast broadcast data to UE1 and UE2 respectively through PTP.
  • the multicast broadcast data sent by the 5G CN can also be sent to the UE through the corresponding protocol data unit (protocol data unit, PDU) session of the UE, that is, in the form of a unicast session tunnel.
  • PDU protocol data unit
  • 5G CN sends multicast broadcast service data to UE3 and UE4, and different PDU sessions have different PDU session tunnels.
  • the RAN can send service data to UE3 and UE4 respectively in a unicast manner.
  • the multicast broadcast session from 5G CN to 5G RAN can also be called a shared transport PDU session or MBS session (session), including multicast sessions and broadcast sessions, and the transmission channel can be called a shared tunnel.
  • the protocol layer structure may include a radio resource control (radio resource control, RRC) layer, a packet data convergence protocol (packet data convergence protocol, PDCP) layer, a radio link control (radio link control, RLC) layer, a media access control ( Protocol layers such as media access control (MAC) layer and physical (physics, PHY) layer.
  • RRC radio resource control
  • PDCP packet data convergence protocol
  • RLC radio link control
  • Protocol layers such as media access control (MAC) layer and physical (physics, PHY) layer.
  • the physical layer is located at the lowest layer (layer 1), the MAC layer, RLC and PDCP belong to the second layer (layer 2), and the RRC belongs to the third layer (layer 3).
  • the PDCP layer may further include a service data adaptation protocol (service data adaptation protocol, SDAP) layer.
  • SDAP service data adaptation protocol
  • the radio access network equipment can include a centralized unit (centralized unit, CU) and a distributed unit (distributed unit, DU), multiple DUs can be centrally controlled by one CU.
  • the CU and DU can be divided according to the protocol layer of the wireless network. For example, the functions of the PDCP layer and above protocol layers are set in the CU, the protocol layers below the PDCP, and the functions of the RLC layer and the MAC layer are set in the DU.
  • this protocol layer is only an example, and it can also be divided in other protocol layers, for example, in the RLC layer.
  • the function is set in the DU; or, it is divided in a certain protocol layer, for example, some functions of the RLC layer and the functions of the protocol layer above the RLC layer are set in the CU, and the remaining functions of the RLC layer and the functions of the protocol layer below the RLC layer are set Set in DU.
  • it can also be divided in other ways, for example, according to the time delay, the functions whose processing time needs to meet the time delay requirement are set in the DU, and the functions that do not need to meet the time delay requirement are set in the CU.
  • the data When a network device and a terminal device perform data transmission, the data needs to pass through each layer on the network device and the terminal device in turn and perform corresponding processing at each layer.
  • the data first arrives at the SDAP layer of the network device, and after being processed by the PDCP layer, it is transmitted to the RLC layer and the MAC layer. After being processed by the MAC layer, the data is sent out through the physical layer. , transmitted to the terminal device through the air interface.
  • the terminal device receives data, it sequentially processes the data packets through the physical layer, the MAC layer, the RLC layer, the PDCP layer and the SDAP layer.
  • each radio bearer The combination of the processing of data packets by the layers of the network device and the terminal device is called a radio bearer, and each data in each radio bearer needs to be processed by each layer.
  • Each layer has corresponding functional entities to perform corresponding functions.
  • the PDCP layer corresponds to the PDCP entity
  • the RLC layer corresponds to the RLC entity
  • the MAC layer corresponds to the MAC entity.
  • each radio bearer includes a PDCP entity and one or more RLC entities
  • each RLC entity corresponds to a logical channel.
  • the packet PDCP entities of the network device and the terminal device can be associated with two radio link RLC entities, which are respectively used in the PTP transmission mode and the PTM transmission mode.
  • the PTP transmission mode means that the downlink data is processed by the PDCP layer of gNB, then transmitted to RLC entity #1 in the RLC layer, and further transmitted to the MAC layer through RLC entity #1 , after the data is packaged at the MAC layer, it is delivered to the physical layer, where it is scrambled with cell-radio network temporary identity (C-RNTI) #1 and sent to UE #1 at the physical layer.
  • C-RNTI cell-radio network temporary identity
  • the UE#1 receives according to the allocated or predefined C-RNTI#1, and submits the received data in the PTP transmission mode to the RLC entity #2 of its RLC layer through the MAC layer, and then further processes through layers such as PDCP,
  • the RLC entity #1 and the RLC entity #2 both correspond to the PTP transmission mode.
  • the PTP transmission mode between gNB and UE#2 is similar.
  • the PTM transmission mode means that the downlink data is transmitted to the RLC entity #3 in the RLC layer after being processed by the PDCP layer of the gNB, and then further transmitted to the MAC layer through the RLC entity #3.
  • the data is submitted to The physical layer is scrambled with group-radio network temporary identity (group-radio network temporary identity, G-RNTI) #1 on the physical layer and sent.
  • G-RNTI group-radio network temporary identity
  • UE#1 and UE#2 respectively receive according to the allocated or predefined G-RNTI#1.
  • UE#1 submits it to the RLC entity# of its RLC layer through its MAC layer 4, and then further processed through its PDCP and other layers, UE#2 is handed over to its RLC entity #5 at its RLC layer through its MAC layer, and then further processed through its PDCP and other layers, wherein RLC entity #3, RLC entity #4 and RLC Entity #5 corresponds to the PTM transmission mode.
  • FIG. 4 only illustrates downlink data as an example, and for uplink data, for example, when an uplink multicast broadcast mechanism is introduced, the situation is similar.
  • TM transparent mode
  • UM unacknowledged mode
  • AM acknowledged mode
  • the TM corresponds to the TM RLC entity (referred to as the TM entity), and this mode can be regarded as an empty RLC, that is, it provides the pass through function of data.
  • UM corresponds to UM RLC entity (referred to as UM entity).
  • This mode provides all RLC functions except retransmission and re-segmentation, that is, it provides an unreliable transmission service.
  • AM corresponds to the AM RLC entity (referred to as the AM entity). This mode can provide a reliable transmission service for business transmission through the error detection and retransmission mechanism.
  • AM provides all RLC functions, including automatic repeat request (automatic repeat request, ARQ) function.
  • ARQ automatic repeat request
  • the so-called ARQ function that is, by detecting the SN field of the received AM data PDU (AM data PDU, AMD PDU), the receiving end can know which PDUs or their segments are lost, and tell the sending end by sending the status (status) PDU, Which AMD PDUs it has successfully received, that is, positive acknowledgment or acknowledgment (ACK), and which AMD PDUs or segments have not been successfully received, that is, negative acknowledgment or non-acknowledgment (NACK). If an AMD PDU loses part of its segments, the lost part will be required to be retransmitted.
  • the so-called status PDU may also be called a status report.
  • the sending end For the sending end whose RLC is configured as AM, it can actively request the receiving end to send a status report, so that the sending end can judge whether to perform data packet retransmission, which is called a polling (polling) mechanism. After receiving the status report, the sender can retransmit the lost packets accordingly.
  • a polling polling
  • some services have high requirements on data reliability. For example, in industrial scenarios or batch terminal device software update services, data packet loss will cause software update failure, which requires re-update. Indeed affect the reliability of service transmission.
  • the current protocol can support the ARQ function in the PTP transmission path, but how to implement ARQ for the data in the PTM transmission path is not clearly stated.
  • the present application provides a communication method and device, in which terminal equipment can give feedback on the receiving status of multicast data, which helps to improve the reliability of data transmission.
  • Fig. 5 is a schematic diagram of a communication method provided by an embodiment of the present application.
  • the method 200 shown in FIG. 5 may be executed by the network device and the terminal device shown in FIGS. 1 to 4 .
  • the network device determines first indication information, the first indication information is used to request a first status report of the terminal device, and the first status report is used to indicate whether the first data is successfully received, the first data is transmitted through the PTM Data sent to an end device.
  • the first indication information may also be referred to as first request information or polling (polling) information, which is used to request a first status report from the terminal device, or, in other words, to poll or query the first status of the terminal device
  • the report is used to trigger the first status report of the terminal device, or to instruct the terminal device to send the first status report, or to enable the terminal device to report the first status report, and the like.
  • the first status report is used to indicate whether the first data is successfully received, that is, the first status report can be used to indicate the receiving status of the first data, and the receiving status includes successful reception and unsuccessful reception (or failure to receive), certain data
  • the packet "successfully received” can be understood as the feedback content corresponding to the serial number of the data packet in the first status report is ACK information
  • the "unsuccessfully received” of a certain data packet can be understood as the serial number of the data packet in the first status report
  • the corresponding feedback content is NACK information.
  • the first data may be at least one AMD PDU or a segment corresponding to at least one AMD PDU, and the first data is data sent to the terminal device through PTM transmission.
  • the first data is data sent by a third RLC entity of the network device, and the third RLC entity corresponds to a PTM transmission mode.
  • RLC entity #3 in FIG. 4 may be regarded as an example of the third RLC entity.
  • the first data can be understood as the data received by the second RLC entity, and the second RLC entity corresponds to the PTM transmission mode.
  • RLC entity #4 or RLC entity #5 in FIG. 4 can be regarded as the second RLC entity.
  • the first data may be all data sent to the terminal device through the PTM transmission mode, or a part of all data sent to the terminal device through the PTM transmission mode.
  • the first data is MBS data.
  • the first indication information may also include identification information of the first data, and the identification information may be a sequence number (sequence number, SN) of the data packet and/or indication information of the segmentation of the data packet, that is, segmentation information ( Segmentation information, SI), or called segmentation information, through which the terminal device can determine which data packets or data packet segments the first data specifically refers to.
  • identification information may be a sequence number (sequence number, SN) of the data packet and/or indication information of the segmentation of the data packet, that is, segmentation information ( Segmentation information, SI), or called segmentation information, through which the terminal device can determine which data packets or data packet segments the first data specifically refers to.
  • SN sequence number
  • SI Segmentation information
  • both the first status report and the first data are for the first MBS radio bearer of the terminal device.
  • the first MBS radio bearer is one or more of the MBS radio bearers configured by the network device for the terminal device.
  • the first indication information and the first status report are sent through the first MBS radio bearer.
  • the network device sends the first indication information to the terminal device through the PTP transmission mode, or in other words, the network device sends the first indication information to the terminal device through the fourth RLC entity, and the fourth RLC entity corresponds to the PTP transmission mode.
  • the terminal device receives the first indication information through the PTP transmission mode, or in other words, the terminal device receives the first indication information through the first RLC entity, and the first RLC entity corresponds to the PTP transmission mode.
  • the PDCP entity of the terminal device is associated with the first RLC entity and the second RLC entity, and the PDCP entity of the network device is associated with the third RLC entity and the fourth RLC entity.
  • RLC entity #1 or RLC entity #6 in FIG. 4 may be regarded as an example of the fourth RLC entity
  • RLC entity #2 or RLC entity #7 may be regarded as an example of the first RLC entity.
  • the terminal device receives the first indication information through PTP transmission, and when the first indication information reaches the first RLC entity, the first RLC entity determines that the first indication information is used to request the first data transmitted through PTM Status report, therefore, the first indication information may be notified to the second RLC entity, or the second RLC entity may be notified through the PDCP entity, wherein the manner of notifying the second RLC entity may be to send the first indication information to the second RLC entity or through The other indication information notifies the existence of the first indication information.
  • the first data is sent and received through the PTM transmission mode, but the first indication information can be transmitted through the PTP transmission mode.
  • the terminal devices receiving MBS services can be supported.
  • Some terminal devices request the first status report. For example, for terminal devices that the network device thinks does not need feedback, they may not request the receiving status of the first data, which helps to reduce unnecessary signaling overhead and waste of resources.
  • the terminal device sends a first status report to the network device according to the first indication information.
  • the terminal device can determine that the network device needs to obtain the receiving status of the first data, or in other words, needs to feed back the first status report to the network device. Therefore, the terminal device can detect the first data and determine the first data Whether the reception is successful, then trigger the first status report, and further, the first status report can be generated. Alternatively, the terminal device may also perform detection after receiving the first data, and then trigger the first status report when receiving the first indication information, and further generate the first status report.
  • triggering the first status report may or may not be equivalent to generating the first status report.
  • the terminal device first triggers the first status report, and then generates the first status report when there are available uplink resources.
  • a first status report such as assembling a status report packet for transmission.
  • the detection of the first data receiving status and the generation of the first status report may be implemented by the second RLC entity of the terminal device.
  • the second RLC entity of the terminal device For a specific detection method of the receiving state, reference may be made to technical solutions known or newly developed by those skilled in the art, which are not limited in this application.
  • the first status report may also include identification information of the first data, for example, SN and SI. Through the identification information, the network device may know which data packets the first status report is for receiving status feedback.
  • the terminal device sends the first status report to the network device.
  • the network device sends the first indication information to the terminal device through PTP transmission, the first indication information is used to request the first status report of the terminal device, and the first status report is used to indicate the Whether the first data is successfully received, the terminal device may feed back the receiving status of the first data according to the first indication information.
  • the network device may perform retransmission, which helps to improve the reliability of data transmission.
  • the first data is the data sent to the terminal device through the PTM transmission mode, or the first data is the data received from the network device through the PTM transmission mode, and it can also be understood that the first data is the data in the PTM transmission path The data.
  • the first indication information may also be understood as information on the PTP transmission path.
  • the receiving status of the first data transmitted through PTM can be requested and fed back, so that the RLC corresponding to the PTM transmission mode in the network device and the terminal device can realize the ARQ function, that is, support the AM working mode, which helps to improve device performance.
  • the first indication information may also indicate that the terminal device does not need to feed back the first status report, for example, the first indication information is 1 bit, and the two values corresponding to the 1 bit indicate whether the terminal device needs to feedback First status report.
  • the first indication information is carried in at least one of the following: RRC signaling, PDCP control PDU, RLC control PDU, media access control control element (media access control control element, MAC CE) or downlink control information ( downlink control information, DCI).
  • the first indication information may be dedicated control information, for example, when the network device sends RRC signaling, PDCP control PDU, RLC control PDU, MAC CE or DCI to the terminal device, it is carried by fields or bits in these information
  • the first indication information in other words, the first indication information may be sent through a variety of different messages, which has greater flexibility.
  • the first indication information is carried in the second data, and the second data is sent by the network device to the terminal device in a PTP transmission manner. That is to say, when the first MBS radio bearer of the terminal device is configured with the PTP transmission mode and the PTM transmission mode, the data packet sent by the network device through the PTP transmission path may carry the first indication information.
  • the first MBS radio bearer includes a first RLC entity and a second RLC entity, the first RLC entity corresponds to the PTP transmission mode, and the second RLC entity corresponds to the PTM transmission mode.
  • the network device sends the first indication information to the terminal device through the PTP transmission mode, including: the network device sends the second data to the terminal device through the PTP transmission mode.
  • the second data is RLC unacknowledged mode data (unacknowledged mode data, UMD) PDU, and the packet header of the second data includes the first indication information.
  • RLC unacknowledged mode data unacknowledged mode data, UMD
  • the second data is an RLC UMD PDU.
  • the first indication can be carried by the bit field of the packet header of the second data information.
  • Fig. 6 is a schematic diagram of the format of some downlink UMD PDUs provided by the embodiment of the present application, wherein:
  • FIG. 6 (a) of Figure 6 is a UMD PDU that includes a complete RLC service data unit (service data unit, SDU), as shown in (a) of Figure 6, this UMD PDU includes an SI domain, a reserved (reserved, R) domain and The data field, wherein, the length of the SI field is 2 bits, and the length of the R field is 6 bits.
  • SDU service data unit
  • (b) of Figure 6 is a UMD PDU that includes a sequence number (sequence number, SN) field of 6 bits (bit), as shown in (b) of Figure 6, this UMD PDU includes an SI domain, an SN domain and a data domain , where the length of the SI field is 2 bits, and the length of the SN field is 6 bits.
  • (c) of Fig. 6 is the UMD PDU that the included SN field is 12 bits, as shown in (c) of Fig. 6, this UMD PDU includes SI field, R field, SN field and data field, wherein, the length of SI field is 2 bits, the length of the R field is 2 bits, and the length of the SN field is 6 bits.
  • the SI field is used to indicate whether the SDU contained in the PDU is a complete SDU or a segmented SDU, and if it is a segmented SDU, whether it is the first segment, the last segment, or the middle Segmentation, SN is used to indicate the number of data packets.
  • the data field is a payload (payload) part of the second data.
  • N represents a byte number, and for byte N, N is a positive integer.
  • the first indication information is located after the SI field in the packet header of the second data. That is, any R field after the SI field is designed as a polling (polling, P) field, and the first indication information is represented by the P field.
  • P polling
  • the packet header of the second data includes an SN field
  • the first indication information is located between the SI field and the SN field.
  • the first indication information is located in an extension field in the packet header of the second data. That is, a byte is extended in the packet header of the second data, and then a bit field in the extended byte is used as the P field.
  • FIG. 6(d) to FIG. 6(f) are three schematic views of the location of the first indication information provided by the embodiment of the present application.
  • the P field represents the first indication information.
  • (d) of FIG. 6 is based on the UMD PDU format shown in FIG. 6 (a), and represents the first indication information through the original R field.
  • the first indication information is located after the SI field.
  • (e) of Figure 6 is based on the UMD PDU format shown in Figure 6 (b), adding an extension byte at the header, and representing the first indication information by the P field in the extension byte.
  • the first indication information is located in the extension field of the packet header.
  • the network device can indicate whether the data packet format currently used by the terminal device is the UMD PDU format shown in (e) of Figure 6 or (b) of Figure 6 through other indication information, such as RRC signaling, so that The terminal device can analyze the received data packet in a correct way.
  • (f) of FIG. 6 is based on the UMD PDU format shown in (c) of FIG. 6, and represents the first indication information through the original R field.
  • the first indication information is located between the SI field and the SN field.
  • the newly designed P field can be called the first polling bit field, that is, the first indication information is the first bit field of the packet header of the second data. Polling bits.
  • the specific indication manner of the first indication information may be: when the value of the P field is 1, it means that the terminal device needs to feed back the first status report , when the value of the P field is 0, it means that the first status report does not need to be fed back. This indication method is only for illustration and is not limited in this application.
  • the second data is a UMD PDU
  • the UM since the UM does not support the ARQ function, when the terminal device receives the first indication information, it can be determined that it is necessary to feed back the reception status of the first data rather than the reception of the second data state.
  • the protocol can stipulate that the first indication information needs to be carried in the UMD PDU including the complete RLC SDU, that is, carried by the UMD PDU shown in (a) of Figure 6.
  • the information shown in (a) of Figure 6 can be carried Any R field in the UMD PDU can be designed as a P field. In this way, the format of UMD PDUs in other formats may not be changed.
  • the protocol may also stipulate that the first indication information needs to be carried in a 12-bit UMD PDU including the SN field, that is, carried by the UMD PDU shown in (c) of Figure 6.
  • the ( Any R field in the UMD PDU shown in c) can be designed as a P field. In this way, the format of UMD PDUs in other formats may not be changed.
  • the second data is an RLC acknowledged mode data (acknowledged mode data, AMD) PDU
  • the packet header of the second data includes first indication information and second indication information
  • the second indication information is used to request a second status report of the terminal device
  • the second status report is used to indicate whether the second data is received successfully.
  • the second data is RLC AMD PDU
  • the bit field of the packet header of the second data includes the first indication in addition to the second indication information information
  • the second indication information is used to request the receiving status of the second data from the terminal device
  • the first indication information is to request the receiving status of the first data in the PTM transmission path to the terminal device.
  • Fig. 7 is a schematic diagram of the format of some downlink AMD PDUs provided by the embodiment of the present application, wherein:
  • FIG. 7 is the RLC AMD PDU that the included SN domain is 12 bits, as shown in (a) of Fig. 7, this AMD PDU includes data/control (data/control, D/C) domain, P domain, SI field, SN field and data field, wherein, the length of the D/C field is 1 bit, the length of the P field is 1 bit, the length of the SI field is 2 bits, and the length of the SN field is 12 bits.
  • FIG. 7 is an RLC AMD PDU whose SN field is 18 bits.
  • this AMD PDU includes D/C domain, P domain, SI domain, R domain, SN domain and data domain, wherein, the length of D/C domain is 1 bit, the length of P domain The length of the SI field is 1 bit, the length of the R field is 2 bits, and the length of the SN field is 18 bits.
  • the D/C field is used to indicate whether the PDU is a data PDU or a control PDU.
  • the P field represents the second indication information, that is, it is used to request the receiving state of the second data from the terminal device, and the indication functions of the SI field, the SN field, the R field and the data field are the same as those in FIG. 6 .
  • the first indication information is located in the D/C field in the packet header of the second data, that is, the D/C field in the packet header of the existing data packet format is reused.
  • the control PDU is fed back from the receiving end to the sending end.
  • the corresponding PDU must be a data PDU. Therefore, it is not necessary to use the D/C field to indicate whether the downlink data packet is a data PDU or a control PDU. PDU, at this time, the D/C domain can be reused as the P2 domain.
  • the first indication information is located after the SI field in the packet header of the second data. That is, any R field after the SI field is designed as a P2 field, and the first indication information is represented by the P2 field.
  • the packet header of the second data includes an SN field
  • the first indication information is located between the SI field and the SN field.
  • the first indication information is located in an extension field in the packet header of the second data. That is, a byte is extended in the packet header of the second data, and then a bit field in the extended byte is used as the P2 field.
  • FIG. 7(c) to FIG. 7(e) are three schematic diagrams of the location of the first indication information provided by the embodiment of the present application.
  • the P2 field represents the first indication information.
  • (c) of FIG. 7 is based on the AMD PDU format shown in (a) of FIG. 7, and represents the first indication information through the original D/C field.
  • the first indication information is located in the original D/C field.
  • (d) of FIG. 7 is based on the AMD PDU format shown in (b) of FIG. 7, and represents the first indication information through the original R domain.
  • the first indication information is located between the SI field and the SN field.
  • (e) of FIG. 7 is based on the AMD PDU format shown in (a) of FIG. 7 , the first indication information is represented by the P2 field in the extension byte of the header. In (e) of FIG. 7 , the first indication information is located in the extension field. In this way, the network device can indicate whether the data packet format currently used by the terminal device is the AMD PDU format shown in (e) of Figure 7 or (a) of Figure 7 through other indication information, such as RRC signaling, so that The terminal device can analyze the received data packet in a correct way.
  • the newly designed P2 field can be called the second polling bit field
  • the existing P field can be called the third polling bit field.
  • the first indication information is the second polling bit of the packet header of the second data
  • the second indication information is the third polling bit of the packet header of the second data, the second polling bit and the third polling bit different.
  • the specific indication manner of the first indication information may be: when the value of the P2 field is 1, it means that the terminal device needs to feed back the first status report , when the value of the P2 field is 0, it means that the first status report does not need to be fed back.
  • the specific indication method of the second indication information may be: when the value of the P field is 1, it means that the terminal device needs to feed back the second status report; when the value of the P field is 0, it means that it does not need to feed back the second status report.
  • the second status report is used to indicate the receiving status of the second data. This indication method is only for illustration and is not limited in this application.
  • the second data is an RLC AMD PDU
  • the header of the second data includes third indication information
  • the third indication information is used to indicate whether there is an extension byte in the header of the second data
  • the extension byte includes the first indication information and the second indication information.
  • Two indication information where the second indication information is used to request a second status report of the terminal device, and the second status report is used to indicate whether the second data is received successfully.
  • the second data is RLC AMD PDU
  • the bit field of the packet header of the second data includes the P field
  • the existing data packet format can be reused
  • the P field is the third indication information, which is used to indicate whether there is an extension byte in the header of the second data.
  • the bit fields in the extension byte represent the first indication information and the second indication respectively. information.
  • the first indication information and the second indication information are respectively indicated by different bits. That is, the extension field in the extension byte includes a P1 field and a P2 field, the P1 field represents the first indication information, the P2 field represents the second indication information, and the first indication information requests the terminal device for the first data in the PTM transmission path The receiving status of the second data, the second indication information is used to request the receiving status of the second data from the terminal device.
  • the first indication information and the second indication information are two values of the same bit respectively. That is, the extension field in the extension byte includes P1, and the two values of the P1 field respectively represent the first indication information and the second indication information, and the first indication information is used to request the terminal device for the first indication information in the PTM transmission path. The receiving status of the data, the second indication information is used to request the receiving status of the second data from the terminal device.
  • Fig. 8 is another schematic diagram of the format of some downlink AMD PDUs provided by the embodiment of the present application.
  • (a) of Fig. 8 and (b) of Fig. 8 are the positions of the first indication information provided by the embodiment of the present application Two diagrams.
  • the indication functions of the D/C field, SI field, SN field, R field and data field are the same as those in FIG. 7 .
  • the P field represents the second indication information.
  • the third indication information in this application may be located in the P field, that is, the P field in the packet header of the existing data packet format is reused.
  • FIG. 8 is based on the AMD PDU format shown in Figure 7 (a), and represents the third indication information through the original P field.
  • the value of the P field is 1, it means that there is an extension byte
  • the value of the P field is 0, it means that there is no extension byte.
  • the extension field in the extension byte includes a P1 field and a P2 field
  • the P1 field represents the first indication information
  • the P2 field represents the second indication information.
  • the value of the P1 field is 1, it means that the terminal device needs to feed back the first status report; when the value of the P1 field is 0, it means that the first status report does not need to be fed back.
  • FIG. 8 is based on the AMD PDU format shown in Figure 7 (a), and represents the third indication information through the original P field.
  • the value of the P field is 1, it means that there is an extension byte , when the value of the P field is 0, it means that there is no extension byte.
  • the extension field in the extension byte includes a P1 field, and the P1 field represents the first indication information and the second indication information.
  • the value of the P1 field is 1, it means that the terminal device needs to feed back the first status report; when the value of the P1 field is 0, it means that the terminal device needs to feed back the second status report.
  • there is no extension byte it means that neither the first status report nor the second status report needs to be fed back by the terminal device.
  • This indication method is only for illustration and is not limited in this application.
  • extension byte may be located in any byte before the data field, for example, the extension byte may be located in byte 3, as shown in (b) of FIG. 8 . Alternatively, the extension byte may also be located at byte 1 or byte 2, and this application does not limit its position.
  • the method further includes: the network device sending sixth indication information to the terminal device, where the sixth indication information is used to indicate a data packet format of the second data. That is, the packet header format of the data packet indicating the PTP transmission path.
  • the network device can instruct the terminal device the packet header format of the second data packet.
  • the second data as an example of an AMD PDU whose SN field is 12 bits (as shown in (a) of FIG. Shown in (a) of Figure 7, or the newly designed packet header format shown in Figure (8).
  • the sixth indication information may be carried in the RRC control signaling or the RCL control PDU. If indicated by the RRC control signaling, the sixth indication information may be carried when sending the configuration information of the first RLC entity to the terminal device.
  • the network device may also indicate implicitly, for example, after the network device configures the second RLC entity of the terminal device as AM, the data packet of the second data is in a newly designed packet header format, or for the first MBS radio bearer
  • the data in the PTP transmission path all use the newly designed header format.
  • the first data that is, the data packet format of the data on the PTM transmission path
  • the following methods can be used:
  • the protocol can define the data of the PTM transmission path to use the header format shown in (a) of Figure 7;
  • the protocol can define that the packet format of the PTM transmission path is consistent with that in the PTP transmission path;
  • the network device indicates the format of the data packet of the first data through the seventh indication information.
  • the formats of the headers of the data packets of the first data and the second data may be the same or different.
  • the seventh indication information may be carried in RRC control signaling or RCL control PDU, and if indicated by RRC control signaling, the seventh indication information may be carried when sending configuration information of the second RLC entity to the terminal device.
  • the packet format of the second data may also be indicated through the sixth indication information.
  • method 3 uses the format of an AMD PDU with an SN field of 12 bits as an example for illustration. If the second data is in the format of an AMD PDU with an SN field of 18 bits, the method in method 3 can also be used to reuse the existing data packet
  • the P field of the format is the third indication information.
  • the packet formats of the first data and the second data may be further indicated. In this way, after receiving the first data or the second data, the terminal device can parse the header of the data packet according to the known header format.
  • the second status report may also be used to indicate the receiving status of the third data
  • the third data is sent by the network device to the terminal device through PTP transmission
  • the third data is related to the The second data is different.
  • the third data is data received by the first RLC entity before the second data. That is, the second status report may be used to indicate whether the second data and the third data are received successfully.
  • the second data in the PTP transmission path is used to carry the first indication information, which not only enables the second RLC entity of the network device and the terminal device to support the AM working mode, but also reduces the burden on the terminal device and the network device. Signaling overhead.
  • the method 200 further includes: S240, the network device sends the first data to the terminal device in a PTM transmission manner.
  • first data may be sent before the first indication information, or may be sent simultaneously with the first indication information, which is not limited in this application.
  • the network device first sends the first indication information through RRC signaling, PDCP control PDU, RLC control PDU, MAC CE or DCI, and then sends the first data through the first MBS radio bearer.
  • the network device sends the first data and the second data through the first MBS radio bearer, where the second data carries the first indication information.
  • the terminal device sends the first status report to the network device, which may be implemented in the following manner:
  • the terminal device sends the first status report to the network device through the uplink path corresponding to the PTM transmission path.
  • the network device may configure an uplink feedback path corresponding to the PTM transmission path for each terminal device, for the terminal device to send the first status report, and the format of the first status report may be consistent with the format of the second status report, that is, the same as the current Consistent with the provisions in the standard.
  • the uplink feedback path corresponding to the PTM transmission path can share a set of RLC entities with the PTM downlink transmission path, that is, the same RLC entity can both send data and receive data, and can perform two-way communication.
  • Fig. 9 is a schematic diagram of two formats of the first status report provided by the present application.
  • FIG. 9 is the format of the status report stipulated in the current standard. Specifically, as shown in (a) of Figure 9,
  • the status report may include a D/C field, a control PDU type (control PDU type, CPT) field, an acknowledgment sequence number (acknowledgment sequence number, ACK_SN) field, a non-acknowledgment sequence number (negative acknowledgment sequence number, NACK_SN) field, and segment offset (segmentation offset, SO) start (SO start) domain, segmentation offset end (SO end) domain, non-acknowledgment range (NACK range) domain and at least one extension (extension) domain (such as E1, E2 or E3).
  • the length of the D/C field is 1 bit
  • the length of the CPT field is 3 bits
  • the D/C field and the CPT field are headers of the status report.
  • the length of ACK_SN is 12 bits, the length of each E1 field is 1 bit, the length of each NACK_SN is 12 bits, the length of each E2 field is 1 bit, and the length of each E3 field is 1 bit.
  • the lengths are 1 bit respectively, the length of each SO start field is 16 bits, and the length of each SO end field is 16 bits.
  • the length of the NACK range is 8 bits.
  • the D/C field is used to indicate whether the PDU is a data PDU or a control PDU.
  • the CPT field is used to indicate the type of the control PDU.
  • the status report is one type of the control PDU, and currently there is only one control PDU.
  • the ACK_SN field is used to indicate the SN of the next data packet that has not been received but is not considered lost by the receiving end, that is, the next SN of the largest SN currently received by the receiving end, that is, the range of data fed back by the status report . For example, if the maximum SN of the data packet currently received by the receiving end is 99, then the value indicated by the acknowledgment sequence number field is 100.
  • the E1 field is used to indicate whether there is a corresponding set of NACK_SN, E1, E2, and E3 fields behind this field.
  • the NACK_SN field is used to indicate the SN number of the lost SDU or SDU segment, that is, the SN number of the lost data packet in the currently received data packet.
  • the E2 field is used to indicate whether there is a set of corresponding SO start and SO end fields after this field.
  • the SO start field is used to indicate the beginning position of an SDU segment in the original SDU, and the SO end field is used to indicate that an SDU segment is in the original SDU. The position of the end in the SDU.
  • the E3 field is used to indicate whether there is a NACK range field after this field, and the NACK range is used to indicate the number of consecutively lost SDUs starting from NACK_SN.
  • the status report includes a status PDU payload (payload) and an RLC control PDU header; wherein, the RLC control PDU header includes a D/C domain and a CPT domain, and the status PDU payload is controlled from the RLC Starting from the first bit after the PDU header, the payload of this status PDU includes an ACK_SN, an E1 field, 0 or more sets of NACK_SN, E1, E2, and E2 fields. In addition, for each set of NACK_SN, E1, E2, and E2 fields , followed by a pair of SO Start and SO End fields, and/or a NACK Range field for each NACK_SN.
  • the first status report in this application may be in the same format as the status report specified in the current standard. That is, the first status report is in the format shown in (a) of FIG. 9 .
  • the terminal device sends the first status report through the uplink path corresponding to the PTP transmission path.
  • the second RLC entity of the terminal device first sends the first status report to the first RLC entity, or forwards it to the first RLC entity through the PDCP entity, and sends it to the network device through the first RLC entity, or the first status report of the terminal device
  • the second RLC entity sends status report generation instruction information and the first data reception status detection result to the first RLC entity, instructing the first RLC entity to generate the first status report according to the first data reception status detection result and send it to the network device.
  • sending to the network device may refer to first sending to the third RLC entity of the network device, and the third RLC entity notifies the fourth RLC entity, or notifies the fourth RLC entity through the PDCP entity of the network device.
  • the first RLC may send the second status report, and the following method may be used to distinguish the first status report and the second status report sent by the first RLC entity.
  • the information that distinguishes the first status report from the second status report can be called status report indication information, identification information or distinguishing information.
  • the first status report and the second status report can also be combined into one status report or assembled into the same PDU It is transmitted inside, and the carried status report indication information is used to distinguish which is the content of the first status report and which is the content of the second status report.
  • the packet header of the first status report includes status report indication information, where the status report indication information is used to indicate that the status report is the first status report.
  • the status report indication information is located in the CPT field in the packet header of the first status report, that is, the CPT field in the packet header of the existing data packet format is reused. It should be noted that the CPT field occupies 3 bits.
  • a value used to indicate that the control PDU is a status report In this application, by default, when the first value of the CPT field indicates that the control PDU is a status report, the first value is also used to indicate that the status report is a second status report, and when the second value of the CPT field indicates The control PDU is a second status report, and the second value is different from the first value. For example, the first value is 000, and the second value is 001.
  • the value of 000 in the CPT field indicates the status report, and other values are reserved values, so this application can use the reserved values of the CPT field, such as at least one of 001 to 111, as the status report Instructions.
  • Table 1 shows the description corresponding to the value of the 3-bit CPT field. It can be seen from Table 1 that the status report indication information is two different values of the CPT field.
  • the control PDU is a second status report used to indicate the receiving status of the second data
  • the control PDU is a first status report used to indicate the receiving status of the first data.
  • the content in Table 1 is aimed at new version UEs, or UEs that support MBS features.
  • new version UEs or UEs that do not support MBS features such as UEs before version 17, the The description in the table parses the CPT domain.
  • the UE of the new version may be a UE supporting the new version (high protocol version)
  • the UE of the old version may be the UE supporting the old version (low protocol version).
  • the UE of the new version and the UE of the old version are exemplary Nomenclature, this application does not limit it.
  • control PDU is a status report (STATUS PDU), and the status report is a second status report 001 first status report 010-111 Reserved, the receiving entity discards PDUs with this encoding
  • the status report indication information is located in an extension field in the packet header of the first status report. That is, a byte is extended in the packet header of the first status report, and then a bit field in the extended byte is used as the status report indication information field.
  • the second status report includes status report indication information, and the status report indication information is used to indicate that the status report is the second status report.
  • the status report indication information may be located in the CPT field or the extension field in the packet header of the second status report.
  • the positions of the status report indication information in the first status report and the second status report may be the same, that is, the first status report or the second status report are respectively represented by two values of the status report indication information.
  • (b) of FIG. 9 is a schematic diagram of the location of the status report indication information provided by the embodiment of the present application.
  • the T field represents status report indication information.
  • (b) of Figure 9 is based on the format of the status report shown in Figure 9 (a), by adding an extension byte in the packet header, an R field in the extension byte is designed as a T field, indicating Status report instructions.
  • the specific indication manner of the status report indication information may be: when the value of the D/C field is 0, the value of the CPT field is 0, and the value of the T field is 1, the The status report is the first status report. When the D/C field takes a value of 0, the CPT field takes a value of 0, and the T field further takes a value of 0, the status report is a second status report.
  • This indication method is only for illustration and is not limited in this application.
  • (b) of FIG. 9 introduces the T domain into the header of the status report, and the T domain indicates the status report indication information.
  • the present application does not limit that the status report indication cannot be expressed through other domains. information, and does not limit the domain name of the status report indication information to other names.
  • T field can be located at the first bit from the left of the newly added extension byte, or it can also be located at the first bit from the right of the newly added extension byte, or it can also be the newly added extension byte Any bit position in the byte, this application does not limit the position of the T field.
  • the method 200 further includes: S250, the network device determines whether to retransmit the first data according to the first status report.
  • the network device When the feedback content corresponding to the sequence number of a certain data packet in the first status report is NACK information, the network device confirms that the data packet is not successfully received, and thus retransmits the data packet. When the feedback content corresponding to the sequence number of a certain data packet in the first status report is ACK information, the network device confirms that the data packet is successfully received, so that the data packet will not be retransmitted.
  • the so-called retransmission can also be understood as resending.
  • the network device may retransmit data packets corresponding to the fed back NACK sequence number or NACK range.
  • the network device learns that the first data has failed to receive, it can perform retransmission, which helps to improve the reliability of data transmission.
  • the method further includes: S201.
  • the network device sends configuration information to the terminal device, where the configuration information is used to indicate that the second RLC entity is in an acknowledged mode.
  • the network device may carry configuration information in the RRC signaling, and configure the second RLC of the terminal device as an acknowledgment mode, so that the terminal device can further detect and/or parse the first indication information.
  • the network device sends the first indication information to the terminal device through PTP transmission, the first indication information is used to request the first status report of the terminal device, and the first status report is used to indicate the Whether the first data is successfully received, the terminal device may detect and feed back the receiving state of the first data according to the first indication information.
  • the network device may perform retransmission, which helps to improve the reliability of data transmission.
  • FIG. 10 is another schematic diagram of a communication method provided by an embodiment of the present application.
  • the method 300 shown in FIG. 10 may be executed by the network device and the terminal device shown in FIGS. 1 to 4 .
  • the network device determines first indication information, where the first indication information is used to request a first status report of the terminal device, where the first status report is used to indicate whether the first data is successfully received.
  • the network device sends first data to the terminal device through PTM transmission, or in other words, the network device sends first data to the terminal device through a third RLC entity, where the first data carries first indication information, and the third RLC The entity corresponds to the PTM transmission mode.
  • the terminal device receives the first data through the PTM transmission mode, or in other words, the terminal device receives the first data through the second RLC entity, the first data carries the first indication information, and the second RLC entity corresponds to the PTM transmission mode.
  • the network device may directly carry the first indication information in the first data in the PTM transmission path, and request the terminal device to feed back the receiving status of the first data.
  • the first data may be an AMD PDU, and the data packet format of the first data is consistent with the provisions in existing standards. For example, it is an AMD PDU whose SN field is 12 bits as shown in (a) of FIG. 7 , or an AMD PDU whose SN field is 18 bits as shown in (b) of FIG. 7 .
  • the first indication information may be represented by a P field of a data packet header of the first data.
  • the first indication information is carried in the first data and sent to the terminal device together with the first data, which can reduce signaling overheads of the terminal device and the network device.
  • the terminal device determines whether to send a first status report to the network device.
  • the terminal device When the terminal device receives the first indication information through the PTM transmission mode, since the first indication information is used to request the first status report of the terminal device, the terminal device determines that the network device needs to obtain the receiving status of the first data, or in other words, The first status report needs to be fed back to the network device, and the terminal device may further determine whether to send the first status report to the network device, or in other words, the terminal device needs to further determine whether to respond to the first indication information.
  • the first status report When it is determined that the first status report needs to be sent, it may perform at least one of the following: detecting the first data, determining whether the first data is successfully received, triggering the first status report, or generating the first status report.
  • triggering the first status report may or may not be equivalent to generating the first status report.
  • the terminal device first triggers the first status report, and then generates the first status report when there are available uplink resources.
  • a first status report such as assembling a status report packet for transmission.
  • the terminal device When it is determined that the first status report does not need to be sent, the terminal device will not detect the receiving status of the first data, nor will it trigger, generate and feed back the first status report, or the terminal device can detect the reception of the first data status, trigger and generate the first status report, but will not feed back the first status report.
  • the detection of the receiving status of the first data and the generation of the first status report may be implemented by the second RLC entity of the terminal device.
  • the first status report may also include identification information of the first data, for example, SN and SI.
  • the network device may know which data packets the first status report is for receiving status feedback. Further, the terminal device sends the first status report to the network device.
  • the network device sends first data to the terminal device through PTM transmission, the first data carries first indication information, and the first indication information is used to request the first status report of the terminal device, the first The status report is used to indicate whether the first data is successfully received, and the terminal device may further determine whether to send the first status report to the network device.
  • the network device can obtain the first status report, and if the first status report indicates that the receiving status of the first data is failure, the network device can retransmit, which helps to improve the reliability of data transmission.
  • the first MBS radio bearer of the terminal device may not be configured with a PTP transmission path, that is, the first MBS radio bearer includes the second RLC entity and does not include the first RLC entity, or may be the first MBS radio bearer of the terminal device.
  • An MBS radio bearer is configured with a PTM transmission path and a PTP transmission path, that is, the first MBS radio bearer includes a first RLC entity and a second RLC entity, wherein the first RLC entity corresponds to the PTP transmission mode, and the second RLC entity corresponds to the PTM transmission mode Way.
  • this application does not limit the configuration of other radio bearers different from the first MBS radio bearer.
  • the receiving status of the first data transmitted through PTM can be requested and fed back, so that the RLC corresponding to the PTM transmission mode in the network device and the terminal device can realize the ARQ function, that is, support the AM working mode, which helps to improve device performance.
  • the first indication information may also indicate that the terminal device does not need to feed back the first status report for the first MBS radio bearer.
  • the first indication information may include at least 1 bit, indicating that the indication information is for Which MBS radio bearer, or, may include 1 bit, and its two values are respectively used to indicate whether the terminal device needs to feed back the first status report for the first MBS radio bearer.
  • the first MBS radio bearer may be one or more of the MBS radio bearers configured by the network device for the terminal device.
  • the method 300 further includes: S340, the network device sends fourth indication information to the first terminal device, where the fourth indication information is used to indicate that the first terminal device does not respond to the first indication information;
  • the first terminal device sends fifth indication information, where the fifth indication information is used to instruct the first terminal device to respond to the first indication information.
  • the terminal device in method 300 includes the first terminal device, that is, the first terminal device is at least one of all terminal devices receiving the MBS service.
  • the fourth indication information or the fifth indication information may be carried by RRC signaling.
  • not responding can be understood as ignoring or stopping the response
  • not responding to the first indication information can be understood as ignoring the P field in the packet header of the first data or not sending the first status report.
  • the terminal device will not send the first status report.
  • Responding to the first indication information can be understood as parsing the P field in the header of the first data, or determining whether to send the first status report according to the indication content of the first indication information.
  • the terminal device when the first indication information indicates that the first status report needs to be fed back, the terminal device sends the first status report according to the first indication information; when the first indication information indicates that the first status report does not need to be fed back, the terminal device No first status report is sent.
  • the first terminal device among the terminal devices in the PTM transmission path may receive the fourth indication information; or receive the fifth indication information.
  • the terminal device determines whether to send the first status report to the network device, including: determining not to send the first status report to the network device according to the fourth indication information; or determining whether to send the first status report to the network device according to the first indication information and the fifth indication information A first status report is sent to the network device.
  • the network device may choose to send one of the fourth indication information and the fifth indication information, for example, the network device sends the fourth indication information to each of the terminal device group #A that does not need to respond to the first indication information, In this way, for a terminal device that has received the fourth indication information, it will ignore the first indication information and will not send the first status report; for a terminal device that has not received the fourth indication information, it can respond to the first indication information by default, That is, it is determined whether to feed back the first status report according to the first indication information.
  • the network device sends the fifth indication information to each of the terminal equipment group #B that needs to respond to the first indication information, so that the terminal equipment that receives the fifth indication information will respond according to the indication of the first indication information
  • the content determines whether to send the first status report; for a terminal device that has not received the fifth indication information, it may default not to respond to the first indication information, that is, not to feed back the first status report.
  • the terminal device group #A includes at least one terminal device
  • the terminal device group #B includes at least one terminal device. Any one of terminal device group #A and terminal device group #B can be regarded as an example of the first terminal device, and all terminal devices receiving MBS services include terminal devices of terminal device group #A and terminal device group #B.
  • the network device may also send the fourth indication information to each of the terminal equipment group #A that does not need to respond to the first indication information, and send the fourth indication information to each of the terminal equipment group #B that needs to respond to the first indication information Send fifth indication information.
  • the fourth indication information and the fifth indication information may be different values of the same indication information, for example, when the value is 1, it indicates the fourth indication information, and when the value is 0, it indicates the fifth indication information information.
  • the network device when the network device sends the first data and the first indication information to the terminal equipment through the PTM transmission mode, it can further send the fourth indication information or the fifth indication information to the first terminal equipment, indicating that the first The terminal device responds or does not respond to the first indication information. In this way, all or some of the terminal devices receiving the MBS service can feed back the receiving status of the first data. For example, for a terminal device that the network device considers does not need feedback, it can be made not to feed back the receiving status of the first data. state, which helps to reduce unnecessary signaling overhead and also improves the flexibility of network device regulation.
  • the fourth indication information or the fifth indication information may be carried in at least one of the following: RRC signaling, PDCP control PDU, RLC control PDU, MAC CE or DCI.
  • fourth indication information and the fifth indication information may be carried in the same message or in different messages, which is not limited in this application.
  • the terminal device determines whether to send the first status report of the first MBS radio bearer to the network device, including: the terminal device determines whether to send the first status report to the network device according to whether the first MBS radio bearer is configured with the first RLC entity A first status report is sent, and the first RLC entity corresponds to a point-to-point PTP transmission mode.
  • each of the above-mentioned terminal devices receiving PTM transmission may determine whether to send the first status report according to the configuration of RLC in its first MBS radio bearer.
  • the first MBS radio bearer When its first MBS radio bearer is configured with the first RLC entity , do not respond to the first indication information, or in other words, do not send the first status report to the network device, and respond to the first indication information when the first MBS radio bearer is not configured with the first RLC entity, or in other words, according to the first indication information
  • the indication content of determines whether to send the first status report of the first MBS radio bearer to the network device.
  • any terminal device configured with the first RLC entity on the first MBS radio bearer may be called the first type of terminal device, and any terminal device not configured with the first RLC entity on the first MBS radio bearer may be called the second type.
  • the first type of terminal device determines that the first MBS radio bearer of itself is configured with the first RLC entity, that is, the first type of terminal device can also receive and send data through the PTP transmission path, therefore, the first type of terminal device
  • the first status report of the first MBS radio bearer may not be sent to the network device. In this case, if the network device needs the first type of terminal device to feed back the first status report, it can be done through the PTP transmission path of the first MBS radio bearer.
  • the network device and the first type of terminal device perform the method 200 process to obtain the first status report.
  • the method 300 and the method 200 may be used together, and the method 300 includes the process of the method 200 .
  • the second type of terminal device determines that the first MBS radio bearer is not configured with the first RLC entity, that is, for the information in the first MBS radio bearer, the second type of terminal device cannot communicate with the network device through the PTP transmission path Therefore, the terminal device of the second type may determine whether to send the first status report of the first MBS radio bearer to the network device according to the indication content of the first indication information.
  • the terminal device determines whether it has configured or not configured the first RLC entity, which is for the same radio bearer as the second RLC entity, that is, the configuration in the first MBS radio bearer, and does not include judging whether other radio bearers are configured First RLC entity.
  • the embodiment of the present application enables the terminal device to know whether a status report of the first data needs to be fed back through a network device instruction or a terminal device self-determined manner, which has higher flexibility.
  • the method further includes: S350, the terminal device sends the first status report to the network device.
  • S350 the terminal device sends the first status report to the network device.
  • it can be implemented through method A or method B in the above method 200, wherein method A can be used for terminal equipment that is not configured with the first RLC entity, and method B can be used for configuring the first RLC entity and the second RLC entity. Terminal equipment of the RLC entity.
  • the method 300 further includes: S360, the network device determines whether to retransmit the first data according to the first status report.
  • the network device When the feedback content corresponding to the sequence number of a data packet in the first status report is NACK information, the network device confirms that the data packet was not successfully received, and retransmits the data packet. When the feedback content corresponding to the sequence number of a certain data packet in the first status report is ACK information, the network device confirms that the data packet is successfully received, so that the data packet will not be retransmitted.
  • the method 300 further includes: S301.
  • the network device sends configuration information to the terminal device, where the configuration information is used to indicate that the second RLC entity is in an acknowledged mode.
  • the network device may carry configuration information in the RRC signaling, and configure the second RLC of the terminal device as an acknowledgment mode, so that the terminal device can further detect and/or parse the first indication information.
  • Fig. 11 is a schematic block diagram of a communication device 400 provided in this application.
  • the apparatus 400 includes a sending unit 410 , a processing unit 420 and a receiving unit 430 .
  • the sending unit 410 and the receiving unit 430 can implement corresponding communication functions, and the processing unit 420 is used for data processing.
  • the sending unit 410 and the receiving unit 430 may also be referred to as communication interfaces or communication units.
  • the device 400 may further include a storage unit, which may be used to store instructions and/or data, and the processing unit 420 may read the instructions and/or data in the storage unit, so that the device implements the aforementioned method embodiments .
  • a storage unit which may be used to store instructions and/or data
  • the processing unit 420 may read the instructions and/or data in the storage unit, so that the device implements the aforementioned method embodiments .
  • the device 400 can be used to execute the actions performed by the device (such as the above-mentioned network device, terminal device, etc.)
  • the receiving unit 430 is configured to perform operations related to device sending and receiving in the above method embodiments
  • the processing unit 420 is configured to perform operations related to device processing in the above method embodiments.
  • the apparatus 400 is configured to perform the actions performed by the network device in the foregoing method 200 embodiment.
  • the processing unit 420 is configured to determine first indication information, where the first indication information is used to request a first status report of the terminal device, where the first status report is used to indicate whether the first data is successfully received, and the first data is passed through the point To the data sent to the terminal equipment by multi-point PTM transmission mode;
  • the sending unit 410 is configured to send the first indication information to the terminal device in a point-to-point PTP transmission manner.
  • the first indication information is carried in at least one of the following: RRC signaling, PDCP control PDU, RLC control PDU, MAC CE or DCI.
  • the sending unit 410 is specifically configured to: send second data to the terminal device in a PTP transmission manner, where the second data bears the first indication information.
  • the second data is RLC unacknowledged mode data UMD PDU, and the packet header of the second data includes the first indication information; or, the second data is RLC acknowledged mode data AMD PDU, and the packet header of the second data includes the First indication information and second indication information, the second indication information is used to request a second status report of the terminal device, and the second status report is used to indicate whether the second data is successfully received; or, the second data is in RLC confirmation mode Data AMD PDU, the packet header of the second data includes third indication information, the third indication information is used to indicate that there is an extension field in the packet header, and the extension field includes the first indication information and the second indication information, and the second indication information uses To request a second status report of the terminal device, the second status report is used to indicate whether the second data is received successfully.
  • the receiving unit 430 is configured to receive the first status report.
  • the processing unit 420 is further configured to: determine whether to retransmit the first data according to the first status report.
  • the apparatus 400 may implement the steps or processes corresponding to the execution of the network device in the method embodiment according to the embodiment of the present application, and the apparatus 400 may include a unit for executing the method 200 executed by the network device in the method embodiment. Moreover, each unit in the apparatus 400 and other operations and/or functions described above are respectively intended to implement a corresponding process of the method embodiment in the network device in the method embodiment.
  • the sending unit 410 can be used to execute the steps of sending information in the method, such as steps S201, S220 and S2240; the receiving unit 430 can be used to execute the steps of receiving information in the method Steps, such as step S230; the processing unit 420 may be used to execute the processing steps in the method, such as steps S210 and S250.
  • the apparatus 400 is configured to perform the actions performed by the terminal device in the foregoing method 200 embodiment.
  • the receiving unit 430 is configured to receive first indication information through point-to-point PTP transmission, the first indication information is used to request a first status report of the terminal device, and the first status report is used to indicate whether the first data is successfully received,
  • the first data is data received from the network device through point-to-multipoint PTM transmission;
  • the processing unit 420 is configured to send a first status report to the network device according to the first indication information.
  • the first indication information is carried in at least one of the following: RRC signaling, PDCP control PDU, RLC control PDU, MAC CE or DCI.
  • the receiving unit 430 is specifically configured to: receive second data from the network device in a PTP transmission manner, where the second data carries the first indication information.
  • the second data is RLC unacknowledged mode data UMD PDU, and the packet header of the second data includes the first indication information; or, the second data is RLC acknowledged mode data AMD PDU, and the packet header of the second data includes the First indication information and second indication information, the second indication information is used to request a second status report of the terminal device, and the second status report is used to indicate whether the second data is successfully received; or, the second data is in RLC confirmation mode Data AMD PDU, the packet header of the second data includes third indication information, the third indication information is used to indicate that there is an extension field in the packet header, and the extension field includes the first indication information and the second indication information, and the second indication information uses To request a second status report of the terminal device, the second status report is used to indicate whether the second data is received successfully.
  • the apparatus 400 may implement steps or processes corresponding to the execution of the terminal device in the method embodiment according to the embodiment of the present application, and the apparatus 400 may include a unit for executing the method 200 executed by the terminal device in the method embodiment. Moreover, each unit in the apparatus 400 and other operations and/or functions described above are respectively for realizing the corresponding process of the method embodiment in the terminal device in the method embodiment.
  • the sending unit 410 can be used to execute the step of sending information in the method, such as step S230; the receiving unit 430 can be used to execute the step of receiving information in the method, such as step S230. S201, S220, and S240; the processing unit 420 may be used to execute processing steps in the method, such as step S230.
  • the apparatus 400 is configured to perform the actions performed by the network device in the foregoing method 300 embodiment.
  • the processing unit 420 is configured to determine first indication information, where the first indication information is used to request a first status report of the terminal device, where the first status report is used to indicate whether the first data is successfully received;
  • the sending unit 410 is configured to send the first data to the terminal device in a PTM transmission manner, where the first data carries first indication information.
  • the terminal device includes a first terminal device
  • the sending unit 410 is further configured to: send fourth indication information to the first terminal device, where the fourth indication information is used to indicate that the first terminal device does not respond to the first indication or, sending fifth indication information to the first terminal device, where the fifth indication information is used to instruct the first terminal device to respond to the first indication information.
  • the fourth indication information or the fifth indication information is carried in at least one of the following: RRC signaling, PDCP control PDU, RLC control PDU, MAC CE or DCI.
  • the receiving unit 430 is configured to receive the first status report.
  • the processing unit 420 is further configured to: determine whether to retransmit the first data according to the first status report.
  • the apparatus 400 may implement steps or processes corresponding to the execution of the network device in the method embodiment according to the embodiment of the present application, and the apparatus 400 may include a unit for executing the method 300 executed by the network device in the method embodiment. Moreover, each unit in the apparatus 400 and other operations and/or functions described above are respectively intended to implement a corresponding process of the method embodiment in the network device in the method embodiment.
  • the sending unit 410 can be used to execute the steps of sending information in the method, such as steps S301, S320 and S3240; the receiving unit 430 can be used to execute the steps of receiving information in the method Steps, such as step S350; the processing unit 420 may be used to execute the processing steps in the method, such as steps S310 and S360.
  • the apparatus 400 is configured to perform the actions performed by the terminal device in the foregoing method 300 embodiment.
  • the receiving unit 430 is configured to receive first data through point-to-multipoint PTM transmission, the first data carries first indication information, the first indication information is used to request a first status report of the terminal device, and the first status report Used to indicate whether the first data is received successfully;
  • the processing unit 420 is configured to determine whether to send the first status report to the network device.
  • the processing unit 420 is specifically configured to: determine whether to send the first status report to the network device according to whether the first radio link control RLC entity is configured, and the first RLC entity corresponds to the point-to-point PTP transmission mode.
  • the processing unit 420 is specifically configured to: not send the first status report to the network device when the first RLC entity is configured; send the first status report to the network device when the first RLC entity is not configured.
  • the processing unit 420 is specifically configured to: determine not to send the first status report to the network device according to fourth indication information from the network device, where the fourth indication information is used to indicate not to respond to the first indication information; or, It is determined to send the first status report to the network device according to fifth indication information from the network device, where the fifth indication information is used to indicate a response to the first indication information.
  • the fourth indication information or the fifth indication information is carried in at least one of the following: RRC signaling, PDCP control PDU, RLC control PDU, MAC CE or DCI.
  • the apparatus 400 may implement steps or processes corresponding to the execution of the terminal device in the method embodiment according to the embodiment of the present application, and the apparatus 400 may include a unit for executing the method 300 executed by the terminal device in the method embodiment. Moreover, each unit in the apparatus 400 and other operations and/or functions described above are respectively for realizing the corresponding process of the method embodiment in the terminal device in the method embodiment.
  • the sending unit 410 can be used to execute the steps of sending information in the method, such as steps S301, S320 and S3240; the receiving unit 430 can be used to execute the steps of receiving information in the method Steps, such as step S350; the processing unit 420 may be used to execute the processing steps in the method, such as steps S310 and S360.
  • FIG. 12 shows a communication device 500 provided by an embodiment of the present application.
  • the device 500 may be the network device or terminal device described in method 200 or method 300.
  • the device 500 may adopt the hardware architecture shown in FIG. 12 .
  • the apparatus may include a processor 510, a transceiver 520, and a memory 530 that communicate with each other through internal connection paths.
  • the related functions implemented by the processing unit 420 in FIG. 11 may be implemented by the processor 510
  • the related functions implemented by the receiving unit 430 and the sending unit 410 in FIG. 11 may be implemented by the processor 510 controlling the transceiver 520 .
  • the processor 510 may include one or more processors, for example, one or more CPUs.
  • the processor may be one or more single-core CPU or a multi-core CPU.
  • the transceiver 520 is used to transmit and receive data and/or information, and to receive data and/or information.
  • the transceiver may include a transmitter for sending data and/or information and a receiver for receiving data and/or information.
  • the memory 530 includes, but is not limited to, random access memory (random access memory, RAM), read-only memory (read-only memory, ROM), erasable programmable read-only memory (erasable programmable read-only memory, EPROM) .
  • RAM random access memory
  • ROM read-only memory
  • EPROM erasable programmable read-only memory
  • CD-ROM Compact disc read-only memory
  • the memory 530 is used to store related instructions and data.
  • the memory 530 is used to store program codes and data of the device, and may be a separate device or integrated in the processor 510 .
  • the processor 510 is configured to control the transceiver to perform information transmission with the terminal device.
  • the processor 510 is configured to control the transceiver to perform information transmission with the terminal device.
  • Fig. 12 only shows a simplified design of the device.
  • the device can also include other necessary components, including but not limited to any number of transceivers, processors, controllers, memories, etc., and all devices that can implement the application are within the scope of protection of the application Inside.
  • the device 500 can be replaced by a chip device, for example, a communication chip that can be used in the device to implement related functions of the processor 510 in the device.
  • the chip device can be a field programmable gate array for realizing relevant functions, an application-specific integrated chip, a system chip, a central processing unit, a network processor, a digital signal processing circuit, a microcontroller, or a programmable controller or other integrated chips .
  • the chip may optionally include one or more memories for storing program codes, which enable the processor to implement corresponding functions when the codes are executed.
  • transceiver or transceiver unit may be an input-output interface, wherein the receiver or receiving unit may be understood as an input interface, and the transmitter or sending unit may be understood as Output Interface.
  • the present application also provides a computer-readable medium on which a computer program is stored, and when the computer program is executed by a computer, the functions of any one of the above method embodiments are realized.
  • the present application also provides a computer program product, which implements the functions of any one of the above method embodiments when executed by a computer.
  • the present application also provides a system, which includes one or more terminal devices and one or more network devices in the aforementioned method 200 or method 300 .
  • all or part of them may be implemented by software, hardware, firmware or any combination thereof.
  • software When implemented using software, it may be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on the computer, the processes or functions according to the embodiments of the present application will be generated in whole or in part.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website, computer, server or data center Transmission to another website site, computer, server or data center by wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.).
  • the computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server or a data center integrated with one or more available media.
  • the available medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a high-density digital video disc (digital video disc, DVD)), or a semiconductor medium (for example, a solid state disk (solid state disk, SSD)) etc.
  • a magnetic medium for example, a floppy disk, a hard disk, a magnetic tape
  • an optical medium for example, a high-density digital video disc (digital video disc, DVD)
  • a semiconductor medium for example, a solid state disk (solid state disk, SSD)
  • references to "an embodiment” throughout this specification mean that a particular feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present application. Thus, various embodiments throughout the specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures or characteristics may be combined in any suitable manner in one or more embodiments.
  • sequence numbers of the above-mentioned processes do not mean the order of execution, and the execution order of the processes should be determined by their functions and internal logic, and should not be used in the embodiments of the present application.
  • the implementation process constitutes any limitation.
  • the names of all nodes and messages in this application are only the names set by this application for the convenience of description.
  • the names in the actual network may be different. It should not be understood that this application limits the names of various nodes and messages. On the contrary, any with and The names of nodes or messages with the same or similar functions used in this application are regarded as the methods of this application or equivalent replacements, and all are within the protection scope of this application.
  • presetting can be realized by pre-saving corresponding codes, tables or other methods that can be used to indicate related information in the device (for example, terminal device).
  • the present application does not limit its specific implementation, such as the preset rules and preset constants in the embodiments of the present application.
  • system and “network” are often used herein interchangeably.
  • the term “and/or” in this article is just an association relationship describing associated objects, which means that there can be three relationships, for example, A and/or B can mean: A exists alone, A and B exist simultaneously, and there exists alone B these three situations.
  • At least one of or “at least one of” means all or any combination of the listed items, for example, "at least one of A, B and C", It can be expressed: A exists alone, B exists alone, C exists alone, A and B exist simultaneously, B and C exist simultaneously, and A, B, and C exist simultaneously. "At least one” herein means one or more. "Multiple" means two or more.
  • B corresponding to A means that B is associated with A, and B can be determined according to A.
  • determining B according to A does not mean determining B only according to A, and B may also be determined according to A and/or other information.
  • the terms “including”, “comprising”, “having” and variations thereof mean “including but not limited to”, unless specifically stated otherwise.
  • the disclosed systems, devices and methods may be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.
  • the functions described above are realized in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium.
  • the technical solution of the present application is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application.
  • the aforementioned storage medium includes: various media capable of storing program codes such as U disk, mobile hard disk, ROM, RAM, magnetic disk or optical disk.

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Abstract

本申请实施例提供了一种通信方法和装置，该方法包括：网络设备确定第一指示信息，该第一指示信息用于请求终端设备的第一状态报告，该第一状态报告用于指示第一数据是否成功接收，该第一数据是通过点到多点PTM传输方式向终端设备发送的数据；网络设备通过点到点PTP传输方式向该终端设备发送该第一指示信息。根据本申请的方法，终端设备能够对通过PTM传输的第一数据的接收状态进行反馈，使得网络设备可以根据第一状态报告确定是否重传第一数据，有助于提高数据传输的可靠性。

Description

一种通信方法和装置
本申请要求申请日为2021年11月23日、申请号为202111397639.4、申请名称为“一种通信方法和装置”的中国发明专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请实施例涉及通信领域，更具体地，涉及一种通信方法和装置。
背景技术
多播广播业务(multicast and broadcast service，MBS)是同时面向多个终端的业务，采用多播或者广播传输方式可以通过较少的资源为大量用户同时提供MBS业务，例如直播业务、公共安全业务、批量软件更新业务等。MBS业务的数据来自数据服务器，经由核心网设备发送到接入网设备，再由接入网设备发送给接收MBS数据的至少一个终端设备。
在一些多播应用场景中，有的业务对数据的可靠性要求较高，例如，工业场景中的业务或者批量终端设备软件更新业务，有数据包丢失会导致软件更新失败，从而需要重新更新，严重影响业务传输的可靠性。
因此，如何提升多播数据的传输可靠性是一个值得关心的问题。
发明内容
本申请实施例提供一种通信方法和装置，终端设备能够对多播数据的接收状态进行反馈，有助于提高数据传输的可靠性。
第一方面，提供了一种通信的方法，该方法可以由网络设备执行，或者，也可以由配置于网络设备的组成部件(例如，芯片或电路)执行，本申请对此不作限定。
该方法包括：确定第一指示信息，该第一指示信息用于请求终端设备的第一状态报告，该第一状态报告用于指示第一数据是否成功接收，该第一数据是通过点到多点(point to multi-point，PTM)传输方式向终端设备发送的数据；通过点到点(point to point，PTP)传输方式向该终端设备发送该第一指示信息。
第一指示信息也可以称为第一请求信息或轮询(polling)信息，其用于向终端设备请求第一状态报告，或者，也可以说，用于轮询或查询终端设备的第一状态报告、或用于触发终端设备的第一状态报告、或用于指示终端设备发送第一状态报告或用于使能终端设备上报第一状态报告等。
第一状态报告用于指示第一数据是否成功接收，即，第一状态报告可以用于指示第一数据的接收状态，接收状态包括成功接收和未成功接收(或者说接收失败)，某一数据包“成功接收”可以理解为第一状态报告中该数据包的序列号对应的反馈内容为(acknowledgement，ACK)信息，某一数据包“未成功接收”可以理解为第一状态报告中 该数据包的序列号对应的反馈内容为(negative acknowledgement，NACK)信息。
在本申请的方案中，网络设备通过PTP传输方式向终端设备发送第一指示信息，该第一指示信息用于请求终端设备的第一状态报告，该第一状态报告用于指示通过PTM传输的第一数据是否成功接收，该终端设备可以根据第一指示信息对第一数据的接收状态进行反馈。可选地，若第一状态报告指示第一数据的接收状态为失败，网络设备可以进行重传，有助于提高数据传输的可靠性。
另一方面，第一指示信息是通过PTP传输方式发送的，能够支持向所有接收MBS业务的终端设备中的全部或部分终端设备请求第一状态报告，例如，对于网络设备认为的不需要反馈的终端设备，可以不向其请求第一数据的接收状态，如此，有助于减少不必要的信令开销，也可提升网络设备调控灵活性。
结合第一方面，在第一方面的某些实现方式中，该第一指示信息承载于以下至少一种：无线资源控制(radio resource control，RRC)信令、分组数据汇聚协议(packet data convergence protocol，PDCP)控制协议数据单元(protocol data unit，PDU)、无线链路控制(radio link control，RLC)控制PDU、媒体接入控制控制元素(media access control control element，MAC CE)或下行控制信息(downlink control information，DCI)。
第一指示信息可以是专用的控制信息，例如，通过RRC信令、PDCP控制PDU、RLC控制PDU、MAC CE或DCI中的字段或比特来承载，换言之，第一指示信息可以通过多种不同的消息发送，具有更强的灵活性。
结合第一方面，在第一方面的某些实现方式中，前述通过PTP传输方式向终端设备发送第一指示信息，包括：通过PTP传输方式向终端设备发送第二数据，该第二数据承载该第一指示信息。
当终端设备的第一MBS无线承载配置了PTP传输方式和PTM传输方式时，网络设备可以通过PTP传输路径发送的数据包携带第一指示信息。
结合第一方面，在第一方面的某些实现方式中，该第二数据为RLC非确认模式数据(unacknowledged mode data，UMD)PDU，该第二数据的包头包括该第一指示信息；或者，该第二数据为RLC确认模式数据(acknowledged mode data，AMD)PDU，该第二数据的包头包括该第一指示信息和第二指示信息，该第二指示信息用于请求终端设备的第二状态报告，该第二状态报告用于指示第二数据是否成功接收；或者，该第二数据为RLC AMD PDU，该第二数据的包头包括第三指示信息，该第三指示信息用于指示第二数据的包头存在扩展域，该扩展域包括该第一指示信息和第二指示信息，该第二指示信息用于请求终端设备的第二状态报告，该第二状态报告用于指示第二数据是否成功接收。
本申请中，通过PTP传输路径中的第二数据来携带第一指示信息，可以减少终端设备和网络设备的信令开销。
结合第一方面，在第一方面的某些实现方式中，该方法还包括：接收第一状态报告；和/或，根据该第一状态报告确定是否重传第一数据。
若第一状态报告指示第一数据的接收状态为失败，网络设备可以进行重传，有助于提高数据传输的可靠性。
结合第一方面，在第一方面的某些实现方式中，该方法还包括：向终端设备发送第六指示信息，该第六指示信息用于指示第二数据的数据包格式。
网络设备可以指示第二数据的数据包格式，以便终端设备进行解析第二数据。
第二方面，提供了一种通信的方法，该方法可以由终端设备执行，或者，也可以由终端设备的组成部件(例如芯片或者电路)执行，对此不作限定。
该方法包括：通过PTP传输方式接收第一指示信息，该第一指示信息用于请求终端设备的第一状态报告，该第一状态报告用于指示第一数据是否成功接收，该第一数据是通过PTM传输方式接收的来自于网络设备的数据；根据该第一指示信息向网络设备发送该第一状态报告。
可选地，关于第一指示信息、第一状态报告的具体说明可以参考上文第一方面。
在本申请的方案中，网络设备通过PTP传输方式向终端设备发送第一指示信息，该第一指示信息用于请求终端设备的第一状态报告，该第一状态报告用于指示通过PTM传输的第一数据是否成功接收，该终端设备可以根据第一指示信息对第一数据的接收状态进行反馈，可选地，若第一状态报告指示第一数据的接收状态为失败，网络设备可以进行重传，有助于提高数据传输的可靠性。
另一方面，第一指示信息是通过PTP传输方式发送的，能够支持向所有接收MBS业务的终端设备中的全部或部分终端设备请求第一状态报告，例如，对于网络设备认为的不需要反馈的终端设备，可以不向其请求第一数据的接收状态，如此，有助于减少不必要的信令开销，也可提升网络设备调控灵活性。
结合第二方面，在第二方面的某些实现方式中，该第一指示信息承载于以下至少一种：RRC信令、PDCP控制PDU、RLC控制PDU、MAC CE或DCI。
第一指示信息可以是专用的控制信息，例如，通过RRC信令、PDCP控制PDU、RLC控制PDU、MAC CE或DCI中的字段或比特来承载，换言之，第一指示信息可以通过多种不同的消息发送，具有更强的灵活性。
结合第二方面，在第二方面的某些实现方式中，该通过PTP传输方式接收第一指示信息，包括：通过PTP传输方式接收来自于网络设备的第二数据，该第二数据承载该第一指示信息。
当终端设备的第一MBS无线承载配置了PTP传输方式和PTM传输方式时，网络设备可以通过PTP传输路径发送的数据包携带第一指示信息。
结合第二方面，在第二方面的某些实现方式中，该第二数据为RLC UMD PDU，该第二数据的包头包括该第一指示信息；或者，该第二数据为RLC AMD PDU，该第二数据的包头包括该第一指示信息和第二指示信息，该第二指示信息用于请求终端设备的第二状态报告，该第二状态报告用于指示第二数据是否成功接收；或者，该第二数据为RLC AMD PDU，该第二数据的包头包括第三指示信息，该第三指示信息用于指示第二数据的包头存在扩展域，该扩展域包括该第一指示信息和第二指示信息，该第二指示信息用于请求终端设备的第二状态报告，该第二状态报告用于指示第二数据是否成功接收。
本申请中，通过PTP传输路径中的第二数据来携带第一指示信息，可以减少终端设备和网络设备的信令开销。
结合第二方面，在第二方面的某些实现方式中，该方法还包括：接收第六指示信息，该第六指示信息用于指示第二数据的数据包格式。
网络设备可以指示第二数据的数据包格式，以便终端设备进行解析第二数据。
第三方面，提供了一种通信的方法，该方法可以由网络设备执行，或者，也可以由网络设备的组成部件(例如芯片或者电路)执行，对此不作限定。
该方法包括：确定第一指示信息，该第一指示信息用于请求终端设备的第一状态报告，该第一状态报告用于指示第一数据是否成功接收；通过PTM传输方式向终端设备发送该第一数据，该第一数据承载该第一指示信息。
可选地，关于第一指示信息、第一状态报告的具体说明可以参考上文第一方面。
在本申请的方案中，网络设备通过PTM传输方式向终端设备发送第一数据，该第一数据承载第一指示信息，该第一指示信息用于请求终端设备的第一状态报告，该第一状态报告用于指示该第一数据是否成功接收，该终端设备可以进一步确定是否需要向网络设备发送第一状态报告。可选地，网络设备可以获得第一状态报告，若第一状态报告指示第一数据的接收状态为失败，网络设备可以进行重传，有助于提高数据传输的可靠性。
另一方面，第一指示信息携带于第一数据中，和第一数据一起发送至终端设备，可以降低信令开销和资源浪费。
结合第三方面，在第三方面的某些实现方式中，该终端设备包括第一终端设备，该方法还包括：向第一终端设备发送第四指示信息，该第四指示信息用于指示第一终端设备不响应第一指示信息；或者，向第一终端设备发送第五指示信息，该第五指示信息用于指示第一终端设备响应第一指示信息。
应理解，“不响应”，可以理解为忽略或停止响应，“不响应第一指示信息”可以理解为忽略第一数据的包头中的轮询(polling，P)域或者不发送第一状态报告，“响应第一指示信息”可以理解为解析第一数据的包头中的P域，或者根据第一指示信息确定发送第一状态报告。
可选地，第四指示信息和第五指示信息可以是两个不同的指示信息，也可以是同一个指示信息的不同取值，例如，当取值为1时表示第四指示信息，取值为0时表示第五指示信息。
结合第三方面，在第三方面的某些实现方式中，该第四指示信息或第五指示信息承载于以下至少一种：RRC信令、PDCP控制协议数据单元PDU、RLC控制PDU、MAC CE或DCI。
第四指示信息和第五指示信息可以是专用的控制信息，例如，通过RRC信令、PDCP控制PDU、RLC控制PDU、MAC CE或DCI中的字段或比特来承载，换言之，第四指示信息和第五指示信息可以通过多种不同的消息发送，具有更强的灵活性。
应理解，第四指示信息和第五指示信息可以承载于相同的消息，也可以承载于不同的消息，本申请不做限定。
本申请实施例中，当网络设备通过PTM传输方式向终端设备发送第一数据和第一指示信息时，可以进一步向其中的第一终端设备发送第四指示信息或第五指示信息，指示第一终端设备响应或不响应第一指示信息。如此，可以实现所有接收MBS业务的终端设备中的全部或部分终端设备反馈第一数据的接收状态，对于网络设备认为的不需要反馈的终端设备，可以使得其不反馈第一数据的接收状态，有助于减小不必要的信令开销，也可以提升网络设备调控的灵活性。
结合第三方面，在第三方面的某些实现方式中，该方法还包括：接收该第一状态报告； 和/或，根据该第一状态报告确定是否重传第一数据。
通过第一状态报告，网络设备在获知第一数据接收失败的情况下，可以进行重传，有助于提高数据传输的可靠性。
第四方面，提供了一种通信的方法，该方法可以由终端设备执行，或者，也可以由终端设备的组成部件(例如芯片或者电路)执行，对此不作限定。
该方法包括：通过PTM传输方式接收第一数据，该第一数据承载第一指示信息，该第一指示信息用于请求终端设备的第一状态报告，该第一状态报告用于指示第一数据是否成功接收；确定是否向网络设备发送该第一状态报告。
可选地，关于第一指示信息、第一状态报告的具体说明可以参考上文第一方面。
在本申请的方案中，网络设备通过PTM传输方式向终端设备发送第一数据，该第一数据承载第一指示信息，该第一指示信息用于请求终端设备的第一状态报告，该第一状态报告用于指示该第一数据是否成功接收，该终端设备可以进一步确定是否需要向网络设备发送第一状态报告。可选地，网络设备可以获得第一状态报告，若第一状态报告指示第一数据的接收状态为失败，网络设备可以进行重传，有助于提高数据传输的可靠性。
另一方面，第一指示信息携带于第一数据中，和第一数据一起发送至终端设备，可以降低终端设备和网络设备的信令开销和资源浪费。
结合第四方面，在第四方面的某些实现方式中，前述确定是否向网络设备发送该第一状态报告，包括：根据该第一指示信息和是否配置第一无线链路控制RLC实体确定是否向网络设备发送该第一状态报告，该第一RLC实体对应PTP传输方式。
本申请中，终端设备可以通过自身的配置情况决定是否反馈第一状态报告，有助于降低终端设备与网络设备的通信开销和资源浪费。
结合第四方面，在第四方面的某些实现方式中，前述根据该第一指示信息和是否配置第一RLC实体确定是否向网络设备发送第一状态报告，包括：当配置了该第一RLC实体时，不向网络设备发送该第一状态报告；当未配置该第一RLC实体时，根据该第一指示信息向网络设备发送该第一状态报告。
本申请的方案使得终端设备能够获知是否需要向网络设备反馈第一数据的状态报告，具有更高的灵活性。
结合第四方面，在第四方面的某些实现方式中，前述确定是否向网络设备发送该第一状态报告，包括：根据来自网络设备的第四指示信息确定不向网络设备发送该第一状态报告，该第四指示信息用于指示不响应第一指示信息；或者，根据该第一指示信息和来自网络设备的第五指示信息确定向网络设备发送该第一状态报告，该第五指示信息用于指示响应第一指示信息。
应理解，“不响应”，可以理解为忽略或停止响应，“不响应第一指示信息”可以理解为忽略第一数据的包头中的轮询(polling，P)域或者不发送第一状态报告，“响应第一指示信息”可以理解为解析第一数据的包头中的P域，或者根据第一指示信息确定发送第一状态报告。
本申请实施例中，当网络设备通过PTM传输方式向终端设备发送第一数据和第一指示信息时，可以进一步向其中的第一终端设备发送第四指示信息或第五指示信息，指示第一终端设备响应或不响应第一指示信息。如此，可以实现所有接收MBS业务的终端设备 中的全部或部分终端设备反馈第一数据的接收状态，例如，对于网络设备认为的不需要反馈的终端设备，可以使得其不反馈第一数据的接收状态，如此，有助于减小不必要的信令开销，也可提升网络设备调控灵活性。
结合第四方面，在第四方面的某些实现方式中，该第四指示信息或第五指示信息承载于以下至少一种：RRC信令、PDCP控制协议数据单元PDU、RLC控制PDU、MAC CE或DCI。
可选地，关于第四指示信息、第五指示信息的具体说明可以参考上文第三方面。
第五方面，提供一种通信装置，该装置用于执行上述第一方面提供的方法。具体地，该通信装置可以包括用于执行第一方面或第一方面的上述任意一种实现方式提供的方法的单元和/或模块，如处理单元和/或通信单元。
在一种实现方式中，该通信装置为网络设备。当该通信装置为网络设备时，通信单元可以是收发器，或，输入/输出接口；处理单元可以是至少一个处理器。可选地，收发器可以为收发电路。可选地，输入/输出接口可以为输入/输出电路。
在另一种实现方式中，该通信装置为网络设备中的芯片、芯片系统或电路。当该通信装置为网络设备中的芯片、芯片系统或电路时，通信单元可以是该芯片、芯片系统或电路上的输入/输出接口、接口电路、输出电路、输入电路、管脚或相关电路等；处理单元可以是至少一个处理器、处理电路或逻辑电路等。
第六方面，提供一种通信装置，该装置用于执行上述第二方面提供的方法。具体地，该通信装置可以包括用于执行第二方面或第二方面的上述任意一种实现方式提供的方法的单元和/或模块，如处理单元和/或通信单元。
在一种实现方式中，该通信装置为终端设备。当该通信装置为终端设备时，通信单元可以是收发器，或，输入/输出接口；处理单元可以是至少一个处理器。可选地，收发器可以为收发电路。可选地，输入/输出接口可以为输入/输出电路。
在另一种实现方式中，该通信装置为终端设备中的芯片、芯片系统或电路。当该通信装置为终端设备中的芯片、芯片系统或电路时，通信单元可以是该芯片、芯片系统或电路上的输入/输出接口、接口电路、输出电路、输入电路、管脚或相关电路等；处理单元可以是至少一个处理器、处理电路或逻辑电路等。
第七方面，提供一种通信装置，该装置用于执行上述第三方面提供的方法。具体地，该通信装置可以包括用于执行第三方面或第三方面的上述任意一种实现方式提供的方法的单元和/或模块，如处理单元和/或通信单元。
在一种实现方式中，该通信装置为网络设备。当该通信装置为网络设备时，通信单元可以是收发器，或，输入/输出接口；处理单元可以是至少一个处理器。可选地，收发器可以为收发电路。可选地，输入/输出接口可以为输入/输出电路。
在另一种实现方式中，该通信装置为网络设备中的芯片、芯片系统或电路。当该通信装置为网络设备中的芯片、芯片系统或电路时，通信单元可以是该芯片、芯片系统或电路上的输入/输出接口、接口电路、输出电路、输入电路、管脚或相关电路等；处理单元可以是至少一个处理器、处理电路或逻辑电路等。
第八方面，提供一种通信装置，该通信装置用于执行上述第四方面提供的方法。具体地，该通信装置可以包括用于执行第四方面或第四方面的上述任意一种实现方式提供的方 法的单元和/或模块，如处理单元和/或通信单元。
在一种实现方式中，该通信装置为终端设备。当该通信装置为终端设备时，通信单元可以是收发器，或，输入/输出接口；处理单元可以是至少一个处理器。可选地，收发器可以为收发电路。可选地，输入/输出接口可以为输入/输出电路。
在另一种实现方式中，该通信装置为终端设备中的芯片、芯片系统或电路。当该通信装置为终端设备中的芯片、芯片系统或电路时，通信单元可以是该芯片、芯片系统或电路上的输入/输出接口、接口电路、输出电路、输入电路、管脚或相关电路等；处理单元可以是至少一个处理器、处理电路或逻辑电路等。
第九方面，提供一种通信装置，该通信装置包括：至少一个处理器，至少一个处理器与至少一个存储器耦合，至少一个存储器用于存储计算机程序或指令，至少一个处理器用于从至少一个存储器中调用并运行该计算机程序或指令，使得通信装置执行第一方面或其任意可能的实现方式中的方法。
在一种实现方式中，该装置为网络设备。
在另一种实现方式中，该通信装置为网络设备中的芯片、芯片系统或电路。
第十方面，提供一种通信装置，该通信装置包括：至少一个处理器，至少一个处理器与至少一个存储器耦合，至少一个存储器用于存储计算机程序或指令，至少一个处理器用于从至少一个存储器中调用并运行该计算机程序或指令，使得通信装置执行第二方面或其任意可能的实现方式中的方法。
在一种实现方式中，该装置为终端设备。
在另一种实现方式中，该装置为终端设备中的芯片、芯片系统或电路。
第十一方面，提供一种通信装置，该通信装置包括：至少一个处理器，至少一个处理器与至少一个存储器耦合，至少一个存储器用于存储计算机程序或指令，至少一个处理器用于从至少一个存储器中调用并运行该计算机程序或指令，使得通信装置执行第三方面或其任意可能的实现方式中的方法。
在一种实现方式中，该装置为网络设备。
在另一种实现方式中，该通信装置为网络设备中的芯片、芯片系统或电路。
第十二方面，提供一种通信装置，该通信装置包括：至少一个处理器，至少一个处理器与至少一个存储器耦合，至少一个存储器用于存储计算机程序或指令，至少一个处理器用于从至少一个存储器中调用并运行该计算机程序或指令，使得通信装置执行第四方面或其任意可能的实现方式中的方法。
在一种实现方式中，该装置为终端设备。
在另一种实现方式中，该装置为终端设备中的芯片、芯片系统或电路。
第十三方面，本申请提供一种处理器，用于执行上述各方面提供的方法。
对于处理器所涉及的发送和获取/接收等操作，如果没有特殊说明，或者，如果未与其在相关描述中的实际作用或者内在逻辑相抵触，则可以理解为处理器输出和接收、输入等操作，也可以理解为由射频电路和天线所进行的发送和接收操作，本申请对此不做限定。
第十四方面，提供一种计算机可读存储介质，该计算机可读存储介质存储用于设备执行的程序代码，该程序代码包括用于执行上述第一方面或第一方面的上述任意一种实现方式、第二方面或第二方面的上述任意一种实现方式、第三方面或第三方面的上述任意一种 实现方式、或第四方面或第四方面的上述任意一种实现方式提供的方法。
第十五方面，提供一种包含指令的计算机程序产品，当该计算机程序产品在计算机上运行时，使得计算机执行上述第一方面或第一方面的上述任意一种实现方式、第二方面或第二方面的上述任意一种实现方式、第三方面或第三方面的上述任意一种实现方式、或第四方面或第四方面的上述任意一种实现方式提供的方法。
第十六方面，提供一种芯片，芯片包括处理器与通信接口，处理器通过通信接口读取存储器上存储的指令，执行上述第一方面或第一方面的上述任意一种实现方式、第二方面或第二方面的上述任意一种实现方式、第三方面或第三方面的上述任意一种实现方式、或第四方面或第四方面的上述任意一种实现方式提供的方法。
可选地，作为一种实现方式，芯片还包括存储器，存储器中存储有计算机程序或指令，处理器用于执行存储器上存储的计算机程序或指令，当计算机程序或指令被执行时，处理器用于执行上述第一方面或第一方面的上述任意一种实现方式、第二方面或第二方面的上述任意一种实现方式、第三方面或第三方面的上述任意一种实现方式、或第四方面或第四方面的上述任意一种实现方式提供的方法。
第十七方面，提供一种通信系统，该通信系统包括第五方面和第六方面所示的通信装置，或者，包括第七方面和第八方面所示的通信装置。
附图说明
图1是适用于本申请实施例的一种通信系统的示意图。
图2是适用于本申请实施例提供的方法的系统架构的示意图。
图3是本申请实施例提供的数据在协议栈的各层的传输过程示意图。
图4是本申请实施例提供的一种协议栈架构的示意图。
图5是本申请实施例提供的一种通信方法的示意图。
图6是本申请实施例提供的一些下行UMD PDU的格式的示意图。
图7是本申请实施例提供的一些下行AMD PDU的格式的示意图。
图8是本申请实施例提供的一些下行AMD PDU的格式的又一示意图。
图9是本申请实施例提供的一些上行AMD PDU的格式的示意图。
图10是本申请实施例提供的一种通信方法的又一示意图。
图11是本申请提供的通信装置的示意性框图。
图12为本申请提供的通信装置的示意性结构图。
具体实施方式
下面将结合附图，对本申请实施例中的技术方案进行描述。
本申请实施例的技术方案可以应用于各种通信系统，例如：全球移动通讯(Global System of Mobile communication，GSM)系统、码分多址(Code Division Multiple Access，CDMA)系统、宽带码分多址(Wideband Code Division Multiple Access，WCDMA)系统、通用分组无线业务(General Packet Radio Service，GPRS)、长期演进(Long Term Evolution，LTE)系统、LTE频分双工(frequency division duplex，FDD)系统、LTE时分双工(time division duplex，TDD)、通用移动通信系统(universal mobile telecommunication system， UMTS)、全球互联微波接入(worldwide interoperability for microwave access，WiMAX)通信系统、第五代(5th Generation，5G)移动通信系统或新空口(new radio，NR)。其中，5G移动通信系统可以是非独立组网(non-standalone，NSA)或独立组网(standalone，SA)。
本申请提供的技术方案还可以应用于机器类通信(machine type communication，MTC)、机器间通信长期演进技术(long term evolution-machine，LTE-M)、设备到设备(device-to device，D2D)网络、机器到机器(machine to machine，M2M)网络、物联网(internet of things，IoT)网络或者其他网络。其中，IoT网络例如可以包括车联网。其中，车联网系统中的通信方式统称为车到其他设备(vehicle to X，V2X，X可以代表任何事物)，例如，该V2X可以包括：车辆到车辆(vehicle to vehicle，V2V)通信，车辆与基础设施(vehicle to infrastructure，V2I)通信、车辆与行人之间的通信(vehicle to pedestrian，V2P)或车辆与网络(vehicle to network，V2N)通信等。
本申请提供的技术方案还可以应用于未来的通信系统，如第六代(6th Generation，6G)移动通信系统等。本申请对此不作限定。
为便于理解本申请实施例，首先结合图1简单介绍适用于本申请实施例的通信系统。
图1是适用于本申请实施例的通信系统的示意图。如图1所示，该移动通信系统100可以包括至少一个网络设备110和至少一个终端设备(如图1中所示的终端设备120、130、140、150，160)。终端设备通过无线的方式与网络设备相连，至少一个终端设备可以发送上行数据或者信息给网络设备，网络设备110也可以将下行数据或者信息发送给至少一个终端设备。并且，多个终端设备也可以组成一个通信系统，例如，终端设备140、150，160可以组成一个通信系统，终端设备140也可以将下行数据或者信息发送给终端设备150和160，终端设备150和160也可以将上行数据或者信息发送给终端设备140。终端设备和网络设备之间可以传输上行和下行数据以及控制信息等。
在本申请实施例中，终端设备也可以称为用户设备(user equipment，UE)、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置。
终端设备可以是一种向用户提供语音/数据连通性的设备，例如，具有无线连接功能的手持式设备、车载设备等。目前，一些终端的举例可以为：手机(mobile phone)、平板电脑(pad)、带无线收发功能的电脑(如笔记本电脑、掌上电脑等)、移动互联网设备(mobile internet device，MID)、虚拟现实(virtual reality，VR)设备、增强现实(augmented reality，AR)设备、工业控制(industrial control)中的无线终端、无人驾驶(self driving)中的无线终端、远程医疗(remote medical)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端(例如，电视机等家电、智慧盒子、游戏机)、蜂窝电话、无绳电话、会话启动协议(session initiation protocol，SIP)电话、无线本地环路(wireless local loop，WLL)站、个人数字助理(personal digital assistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备，5G网络中的终端设备或者未来演进的公用陆地移动通信网络(public land mobile network，PLMN)中的终端设备等。
其中，可穿戴设备也可以称为穿戴式智能设备，是应用穿戴式技术对日常穿戴进行智能化设计、开发出可以穿戴的设备的总称，如眼镜、手套、手表、服饰及鞋等。可穿戴设备即直接穿在身上，或是整合到用户的衣服或配件的一种便携式设备。可穿戴设备不仅仅是一种硬件设备，更是通过软件支持以及数据交互、云端交互来实现强大的功能。广义穿戴式智能设备包括功能全、尺寸大、可不依赖智能手机实现完整或者部分的功能，例如：智能手表或智能眼镜等，以及专注于某一类应用功能，需要和其它设备如智能手机配合使用，如各类进行体征监测的智能手环、智能首饰等。
此外，终端设备还可以是物联网(Internet of things，IoT)系统中的终端设备。IoT是未来信息技术发展的重要组成部分，其主要技术特点是将物品通过通信技术与网络连接，从而实现人机互连，物物互连的智能化网络。IoT技术可以通过例如窄带(narrow band，NB)技术，做到海量连接，深度覆盖，终端省电。
在本申请实施例中，该终端设备还可以是车辆或整车，通过车联网可以实现通信，也可以是位于车辆内(例如放置在车辆内或安装在车辆内)的部件，即车载终端设备、车载模块或者车载单元(on-board unit，OBU)。
此外，终端设备还可以包括智能打印机、火车探测器、加油站等传感器，主要功能包括收集数据(部分终端设备)、接收网络设备的控制信息与下行数据，并发送电磁波，向网络设备传输上行数据。
本申请实施例中，网络设备可以是任意一种具有无线收发功能的设备。该设备包括但不限于：演进型节点B(evolved Node B，eNB)、无线网络控制器(radio network controller，RNC)、节点B(Node B，NB)、基站控制器(base station controller，BSC)、基站收发台(base transceiver station，BTS)、家庭基站(例如，home evolved NodeB，或home Node B，HNB)、基带单元(baseband unit，BBU)，无线保真(wireless fidelity，WiFi)系统中的接入点(access point，AP)、无线中继节点、无线回传节点、传输点(transmission point，TP)或者发送接收点(transmission and reception point，TRP)等，还可以为5G，如，NR，系统中的gNB，或，传输点(TRP或TP)，5G系统中的基站的一个或一组(包括多个天线面板)天线面板，或者，还可以为构成gNB或传输点的网络节点，如基带单元(BBU)，或，分布式单元(distributed unit，DU)，或者下一代通信6G系统中的基站等。本申请实施例对无线接入网设备所采用的具体技术和具体设备形态不做限定。
可选地，如图1所示，网络设备可以为无线接入网设备(radio access network，RAN)。
应理解，上述图1所示的本申请实施例能够应用的网络架构仅是一种举例说明，适用本申请实施例的网络架构并不局限于此，任何能够实现上述各个网元的功能的网络架构都适用于本申请实施例。可选地，该通信系统100中还可以包括其它网络设备和/或终端设备，本申请不做限定。
多播广播业务(multicast and broadcast service，MBS)是同时面向多个终端的业务，采用多播或者广播传输方式可以通过较少的资源为大量具有相同需求的用户同时提供MBS业务，例如直播业务、公共安全业务、批量软件更新业务等。
MBS的数据来自数据服务器，经由核心网设备发送到接入网设备，再由接入网设备发送给接收MBS数据的至少一个终端设备。在接入网设备向终端设备发送时，数据包通过MBS无线承载传输。一个MBS无线承载可以包括点到多点(point to multi-point，PTM) 传输方式和/或点到点(point to point，PTP)传输方式。PTM传输方式是指网络设备同时向多个终端设备发送相同的数据，在采用PTM传输方式时，针对同一数据，网络设备(例如基站)发送的过程中有多个终端设备采用相同的方式对该数据进行接收。PTP传输方式是指针对某一数据，一个网络设备分别向不同的终端设备独立进行发送。
以图2所示的系统架构中多播广播业务的传输为例，多播广播业务的数据可以从5G CN发送至UE1、UE2、UE3和UE4。其中，5G CN到5G RAN的传输路径可以是多播广播会话隧道。例如，5G CN向UE1和UE2发送多播广播业务的数据，UE1和UE2的多播广播会话隧道是共享的。在空口上，RAN可以通过点到多点PTM方式向UE1、和UE2发送上述多播广播数据，即发送一份数据，两个UE均可接收。RAN也可以通过PTP方式分别向UE1和UE2发送上述多播广播数据。5G CN发送的多播广播数据也可以通过UE各自对应的协议数据单元(protocol data unit，PDU)会话发送给UE，即通过单播会话隧道的形式。例如，5G CN向UE3和UE4发送多播广播业务的数据，不同的PDU会话具有不同的PDU会话隧道。在空口上，RAN可以以单播的方式分别向UE3和UE4发送业务数据。在图2所示的架构中，5G CN到5G RAN的多播广播会话也可以称为共享传送PDU会话或MBS会话(session)，包括多播会话和广播会话，传输通道可以称为共享隧道。
相互通信的网络设备和终端设备(例如，图1中的110和任一个终端设备、图2中的5G RAN和任一个UE)具有一定的协议层结构。例如，如图3所示的协议层架构。该协议层结构可以包括无线资源控制(radio resource control，RRC)层、分组数据汇聚协议(packet data convergence protocol，PDCP)层、无线链路控制(radio link control，RLC)层、媒体接入控制(media access control，MAC)层和物理(physics，PHY)层等协议层。其中，物理层位于最低层(层一)，MAC层、RLC以及PDCP属于第二层(层二)，RRC属于第三层(层三)。在一种实现中，PDCP层之上还可以包括业务数据适配(service data adaptation protocol，SDAP)层。
这些协议层的功能可以由一个节点实现，或者可以由多个节点实现；例如，在一种演进结构中，无线接入网设备可以包括集中单元(centralized unit，CU)和分布单元(distributed unit，DU)，多个DU可以由一个CU集中控制。CU和DU可以根据无线网络的协议层划分，例如，PDCP层及以上协议层的功能设置在CU，PDCP以下的协议层，RLC层和MAC层等的功能设置在DU等。
应该理解的是，这种协议层的划分仅仅是一种举例，还可以在其它协议层划分，例如在RLC层划分，将RLC层及以上协议层的功能设置在CU，RLC层以下协议层的功能设置在DU；或者，在某个协议层中划分，例如将RLC层的部分功能和RLC层以上的协议层的功能设置在CU，将RLC层的剩余功能和RLC层以下的协议层的功能设置在DU。此外，也可以按其它方式划分，例如按时延划分，将处理时间需要满足时延要求的功能设置在DU，不需要满足该时延要求的功能设置在CU。
在网络设备和终端设备进行数据传输时，数据需要依次经过网络设备和终端设备上的各个层并在各个层进行相应的处理。以MBS业务的数据传输为例，如图3所示，数据首先到网络设备的SDAP层，经过PDCP层的处理以后传输到RLC层和MAC层，在MAC层经过处理之后，通过物理层发送出去，通过空口传输给终端设备。终端设备接收数据时， 依次经过物理层、MAC层、RLC层、PDCP层和SDAP层对数据包依次进行对应的处理。可以将网络设备和终端设备各层对数据包的处理结合起来称为无线承载，对于每个无线承载中的每个数据，都需要经过各个层的处理。每个层都有相应的功能实体来执行相应的功能，例如，PDCP层对应PDCP实体，RLC层对应RLC实体，MAC层对应MAC实体等。其中，每个无线承载包含一个PDCP实体以及一个或者多个RLC实体，每个RLC实体对应一个逻辑信道。
在目前的协议栈架构中，网络设备和终端设备的分组PDCP实体可以关联两个无线链RLC实体，分别用于PTP传输方式和PTM传输方式。如图4所示，以下行数据传输为例，PTP传输方式是指该下行数据经过gNB的PDCP层处理之后，传输到RLC层中的RLC实体#1，经过RLC实体#1进一步传输至MAC层，该数据在MAC层组包以后，递交到物理层，在物理层通过与小区无线网络临时标识(cell-radio network temporary identity，C-RNTI)#1加扰并发送给UE#1。UE#1根据分配的或者预定义的C-RNTI#1进行接收，将接收到的PTP传输方式的数据，经过MAC层递交给其RLC层的RLC实体#2，然后经由PDCP等层进一步处理，其中RLC实体#1和RLC实体#2均对应PTP传输方式。gNB和UE#2之间的PTP传输方式是类似的。PTM传输方式是指，该下行数据经过gNB的PDCP层处理之后，传输到RLC层中的RLC实体#3，经过RLC实体#3进一步传输至MAC层，该数据在MAC层组包以后，递交到物理层，在物理层通过与组无线网络临时标识(group-radio network temporary identity，G-RNTI)#1加扰并发送。UE#1和UE#2分别根据分配的或者预定义的G-RNTI#1进行接收，在接收到的PTM传输方式的数据后，UE#1经过其MAC层递交给其RLC层的RLC实体#4，然后经由其PDCP等层进一步处理，UE#2经过其MAC层递交给其RLC层的RLC实体#5，然后经由其PDCP等层进一步处理，其中RLC实体#3、RLC实体#4和RLC实体#5均对应PTM传输方式。应理解，图4仅以下行数据为例进行说明，对上行数据来说，例如，引入上行多播广播机制时，情况是类似的。
对图4中的任一个RLC来说，其工作模式包括透明模式(transparent mode，TM)、非确认模式(unacknowledged mode，UM)和确认模式(acknowledged mode，AM)。TM对应TM RLC实体(简称TM实体)，该模式可以认为是空的RLC，即提供数据的透传(pass through)功能。UM对应UM RLC实体(简称UM实体)，该模式提供除重传和重分段外的所有RLC功能，即提供一种不可靠的传输服务。AM对应AM RLC实体(简称AM实体)，该模式通过出错检测和重传机制，可以为业务传输提供一种可靠的传输服务。需要说明的是，AM提供了所有的RLC功能，包括自动重传请求(automatic repeat request，ARQ)功能。所谓ARQ功能，即通过检测接收到的AM数据PDU(AM data PDU，AMD PDU)的SN域，接收端可以知道丢失了哪些PDU或其分段，并通过发送状态(status)PDU告诉发送端，其成功接收了哪些AMD PDU，即肯定应答或确认(acknowledgement，ACK)，以及哪些AMD PDU或分段还没有成功接收到，即否定应答或非确认(negative acknowledgement，NACK)。如果一个AMD PDU丢失了部分分段，则丢失的部分会被要求重传。所谓状态PDU，也可以称为状态报告。对于RLC被配置为AM的发送端来说，其可以主动请求接收端发送状态报告，以便发送端判断是否需要执行数据包重传，称为轮询(polling)机制。发送端收到状态报告以后，可以根据丢失的包来进行相应的重传。
在一些多播应用场景中，有的业务对数据的可靠性要求较高，例如，工业场景中的业 务或者批量终端设备软件更新业务，有数据包丢失会导致软件更新失败，从而需要重新更新，严重影响业务传输的可靠性。
因此，如何提升多播数据的传输可靠性是一个值得关心的问题。当前协议中可以支持PTP传输路径中的ARQ功能，而PTM传输路径中的数据如何实现ARQ并未明确说明。
本申请提供一种通信方法和装置，终端设备能够对多播数据的接收状态进行反馈，有助于提高数据传输的可靠性。
以下，不失一般性，以网络设备和终端设备之间的交互为例详细说明本申请实施例提供的通信方法。
图5是本申请实施例提供的一种通信方法的示意图。图5所示的方法200可以由图1至图4中所示的网络设备和终端设备执行。
S210，网络设备确定第一指示信息，该第一指示信息用于请求终端设备的第一状态报告，该第一状态报告用于指示第一数据是否成功接收，该第一数据是通过PTM传输方式向终端设备发送的数据。
第一指示信息也可以称为第一请求信息或轮询(polling)信息，其用于向终端设备请求第一状态报告，或者，也可以说，用于轮询或查询终端设备的第一状态报告、或用于触发终端设备的第一状态报告、或用于指示终端设备发送第一状态报告或用于使能终端设备上报第一状态报告等。
第一状态报告用于指示第一数据是否成功接收，即，第一状态报告可以用于指示第一数据的接收状态，接收状态包括成功接收和未成功接收(或者说接收失败)，某一数据包“成功接收”可以理解为第一状态报告中该数据包的序列号对应的反馈内容为ACK信息，某一数据包“未成功接收”可以理解为第一状态报告中该数据包的序列号对应的反馈内容为NACK信息。
第一数据可以为至少一个AMD PDU或至少一个AMD PDU对应的分段，第一数据是通过PTM传输方式向终端设备发送的数据。或者，第一数据是通过网络设备的第三RLC实体发送的数据，该第三RLC实体对应PTM传输方式，例如，图4中的RLC实体#3可以视为第三RLC实体的一例。从终端设备来说，第一数据可以理解为是通过第二RLC实体接收的数据，该第二RLC实体对应PTM传输方式，图4中的RLC实体#4或RLC实体#5可以视为第二RLC实体的一例。值得注意的是，第一数据可以是所有通过PTM传输方式向终端设备发送的数据，或者是所有通过PTM传输方式向终端设备发送的数据中的一部分数据。
可选地，第一数据为MBS的数据。
可选地，第一指示信息还可以包括第一数据的标识信息，该标识信息可以是数据包的序列号(sequence number，SN)和/或数据包分段的指示信息，即分段信息(segmentation information，SI)，或者称为分割信息，通过该标识信息，终端设备可以确定第一数据具体指的是哪些数据包或者数据包分段。
可选地，这里第一状态报告和第一数据均是针对终端设备的第一MBS无线承载而言。第一MBS无线承载是网络设备为终端设备配置的MBS无线承载中的一个或多个。
可选地，第一指示信息和第一状态报告通过第一MBS无线承载发送。
S220，网络设备通过PTP传输方式向该终端设备发送第一指示信息，或者说，网络 设备通过第四RLC实体向该终端设备发送第一指示信息，该第四RLC实体对应PTP传输方式。相应地，终端设备通过PTP传输方式接收该第一指示信息，或者说，终端设备通过第一RLC实体接收第一指示信息，该第一RLC实体对应PTP传输方式。该终端设备的PDCP实体关联第一RLC实体和第二RLC实体，该网络设备的PDCP实体关联第三RLC实体和第四RLC实体。图4中的RLC实体#1或RLC实体#6可以视为第四RLC实体的一例，RLC实体#2或RLC实体#7可以视为第一RLC实体的一例。
可选地，终端设备通过PTP传输方式接收第一指示信息，当第一指示信息到达第一RLC实体时，第一RLC实体确定该第一指示信息是用于请求通过PTM传输的第一数据的状态报告，因此，可以将第一指示信息告知第二RLC实体，或者通过PDCP实体告知第二RLC实体，其中告知第二RLC实体的方式可以是将第一指示信息发送给第二RLC实体或者通过其他指示信息告知第一指示信息的存在。
本申请中，第一数据是通过PTM传输方式发送和接收的，但是第一指示信息是可以通过PTP传输方式传输的，通过这种方式，能够支持向所有接收MBS业务的终端设备中的全部或部分终端设备请求第一状态报告，例如，对于网络设备认为的不需要反馈的终端设备，可以不向其请求第一数据的接收状态，有助于减少不必要的信令开销和资源浪费。
S230，终端设备根据该第一指示信息向网络设备发送第一状态报告。
根据第一指示信息，终端设备可以确定网络设备需要获取第一数据的接收状态，或者说，需要向网络设备反馈第一状态报告，因此，终端设备可以对第一数据进行检测，确定第一数据是否成功接收，然后触发第一状态报告，进一步，可以生成第一状态报告。或者，终端设备也可以在收到第一数据后就进行检测，然后在接收第一指示信息的情况下，触发第一状态报告，进一步生成第一状态报告。
可选的，触发第一状态报告可以等同于生成第一状态报告，也可以不等同于生成第一状态报告，例如，终端设备先触发第一状态报告，当有可用的上行资源时，再生成第一状态报告，比如组装用于发送的状态报告数据包。
可选地，对第一数据接收状态的检测和第一状态报告的生成可以由终端设备的第二RLC实体来实现。接收状态的具体检测方法可以参考本领域的技术人员已知或新研发的技术方案，本申请不做限定。
可选地，第一状态报告还可以包括第一数据的标识信息，例如，SN和SI，通过该标识信息，网络设备可以得知第一状态报告是针对哪些数据包的接收状态的反馈。
进一步，终端设备向网络设备发送该第一状态报告。
在本申请的方案中，网络设备通过PTP传输方式向终端设备发送第一指示信息，该第一指示信息用于请求终端设备的第一状态报告，该第一状态报告用于指示通过PTM传输的第一数据是否成功接收，该终端设备可以根据第一指示信息对第一数据的接收状态进行反馈。可选地，若第一状态报告指示第一数据的接收状态为失败，网络设备可以进行重传，有助于提高数据传输的可靠性。
应理解，第一数据是通过PTM传输方式向终端设备发送的数据，或者，第一数据是通过PTM传输方式接收的来自于网络设备的数据，也可以理解为，第一数据是PTM传输路径中的数据。类似地，第一指示信息也可以理解为是PTP传输路径上的信息。
还应理解，本申请中可以请求和反馈通过PTM传输的第一数据的接收状态，使得网 络设备和终端设备中对应PTM传输方式的RLC可以实现ARQ功能，即支持AM工作模式，有助于提升设备的性能。
在一种实现方式中，第一指示信息还可以指示不需要终端设备反馈第一状态报告，例如，第一指示信息为1比特，该1比特对应的两个取值分别指示是否需要终端设备反馈第一状态报告。
在一种实现方式中，第一指示信息承载于以下至少一种：RRC信令、PDCP控制PDU、RLC控制PDU、媒体接入控制控制元素(media access controlcontrol element，MAC CE)或下行控制信息(downlink control information，DCI)。
第一指示信息可以是专用的控制信息，例如，在网络设备向终端设备发送RRC信令、PDCP控制PDU、RLC控制PDU、MAC CE或DCI的情况下，通过这些信息中的字段或比特来携带第一指示信息，换言之，第一指示信息可以通过多种不同的消息发送，具有更强的灵活性。
在一种实现方式中，第一指示信息承载于第二数据中，该第二数据是网络设备通过PTP传输方式向终端设备发送的。也就是说，当终端设备的第一MBS无线承载配置了PTP传输方式和PTM传输方式时，网络设备可以通过PTP传输路径发送的数据包携带第一指示信息。其中，第一MBS无线承载包括第一RLC实体和第二RLC实体，第一RLC实体对应PTP传输方式，第二RLC实体对应PTM传输方式。
此时，S220，网络设备通过PTP传输方式向该终端设备发送第一指示信息，包括：网络设备通过PTP传输方式向终端设备发送第二数据。
下面具体说明第二数据如何承载第一指示信息。
方式一：
第二数据为RLC非确认模式数据(unacknowledged mode data，UMD)PDU，该第二数据的包头包括第一指示信息。
具体而言，当第一RLC实体被配置为UM，第二RLC实体被配置为AM时，第二数据为RLC UMD PDU，此时，可以通过第二数据的包头的比特域来携带第一指示信息。
图6是本申请实施例提供的一些下行UMD PDU的格式的示意图，其中：
图6的(a)是包括完整RLC服务数据单元(service data unit，SDU)的UMD PDU，如图6的(a)所示，此UMD PDU包括SI域、预留(reserved，R)域和数据域，其中，SI域的长度为2比特，R域的长度为6比特。
图6的(b)是包括的序列号(sequence number，SN)域为6比特(bit)的UMD PDU，如图6的(b)所示，此UMD PDU包括SI域、SN域和数据域，其中，SI域的长度为2比特，SN域的长度为6比特。
图6的(c)是包括的SN域为12比特的UMD PDU，如图6的(c)所示，此UMD PDU包括SI域、R域、SN域和数据域，其中，SI域的长度为2比特，R域的长度为2比特，SN域的长度为6比特。
在图6中，SI域用来指示该PDU包含的SDU是完整的SDU还是经过分段的SDU，如果是经过分段的SDU，进一步是第一个分段还是最后一个分段，还是中间的分段，SN用于指示数据包的编号。数据域为第二数据的有效载荷(payload)部分。此外，在图6至图8中，N表示字节号，对于字节N，N为正整数。
在一种实现方式中，该第一指示信息位于第二数据的包头中的SI域之后。也就是，将SI域之后的任一个R域设计为轮询(polling，P)域，通过P域表示第一指示信息。可选地，当该第二数据的包头包括SN域，该第一指示信息位于SI域与SN域之间。
在一种实现方式中，该第一指示信息位于第二数据的包头中的扩展域。也就是，在第二数据的包头中扩展一个字节，然后通过该扩展字节中的一个比特域来作为P域。
作为示例，图6的(d)至图6的(f)是本申请实施例提供的第一指示信息的位置的三种示意图。其中P域表示第一指示信息。
图6的(d)是在图6的(a)所示的UMD PDU格式的基础上，通过原来的R域表示第一指示信息。在图6的(d)中，第一指示信息位于SI域之后。
图6的(e)是在图6的(b)所示的UMD PDU格式的基础上，在包头新增一个扩展字节，通过扩展字节中的P域表示第一指示信息。在图6的(e)中，第一指示信息位于包头的扩展域。这种方式下，网络设备可以通过其他指示信息，例如，RRC信令等指示终端设备当前使用的数据包格式是图6的(e)还是图6的(b)所示的UMD PDU格式，以便终端设备可以按照正确的方式对接收到的数据包进行解析。
图6的(f)是在图6的(c)所示的UMD PDU格式的基础上，通过原来的R域表示第一指示信息。在图6的(f)中，第一指示信息位于SI域和SN域之间。
应理解，在图6的(d)、(e)和(f)中，新设计的P域可以称为第一轮询比特域，即该第一指示信息为第二数据的包头的第一轮询比特。作为示例，在图6的(d)、(e)和(f)中，第一指示信息的具体指示方式可以为：当P域取值为1时，表示需要该终端设备反馈第一状态报告，当P域取值为0时，表示不需要反馈第一状态报告。这种指示方式仅为举例说明，本申请不做限定。
还应理解，图6的(d)、(e)和(f)中P域的位置仅为示例，并不构成对本申请的限定，只要可以携带第一指示信息即可。例如，在图6的(a)和(c)所示的UMD PDU格式中，也可以在包头新增扩展字节，将扩展字节中的一个R域设计为P域，该P域表示第一指示信息。
还应理解，当第二数据为UMD PDU时，由于UM不支持ARQ功能，所以当终端设备接收到第一指示信息时，可以确定是需要反馈第一数据的接收状态而非第二数据的接收状态。
作为示例，协议可以规定第一指示信息需要承载于包括完整RLC SDU的UMD PDU，即通过图6的(a)所示的UMD PDU携带，此时，可以将图6的(a)所示的UMD PDU中的任一个R域设计为P域即可。通过这种方式，可以不改动其他格式的UMD PDU的格式。
可选地，协议也可以规定第一指示信息需要承载于包括的SN域为12比特的UMD PDU，即通过图6的(c)所示的UMD PDU携带，此时，可以将图6的(c)所示的UMD PDU中的任一个R域设计为P域即可。通过这种方式，可以不改动其他格式的UMD PDU的格式。
方式二：
第二数据为RLC确认模式数据(acknowledged mode data，AMD)PDU，该第二数据的包头包括第一指示信息和第二指示信息，该第二指示信息用于请求终端设备的第二状态 报告，该第二状态报告用于指示第二数据是否成功接收。
具体而言，当第一RLC和第二RLC实体均被配置为AM时，第二数据为RLC AMD PDU，此时，第二数据的包头的比特域除了包括第二指示信息还包括第一指示信息，该第二指示信息是用于向终端设备请求该第二数据的接收状态，而第一指示信息是向终端设备请求PTM传输路径中的第一数据的接收状态。
图7是本申请实施例提供的一些下行AMD PDU的格式的示意图，其中：
图7的(a)是包括的SN域为12比特的RLC AMD PDU，如图7的(a)所示，此AMD PDU包括数据/控制(data/control，D/C)域、P域、SI域、SN域和数据域，其中，D/C域的长度为1比特，P域的长度为1比特，SI域的长度为2比特，SN域的长度为12比特。
图7的(b)是包括的SN域为18比特的RLC AMD PDU。如图7的(b)所示，此AMD PDU包括D/C域、P域、SI域、R域、SN域和数据域，其中，D/C域的长度为1比特，P域的长度为1比特，SI域的长度为2比特，R域长度为2比特，SN域的长度为18比特。
在图7中，D/C域用来指示该PDU为数据PDU还是控制PDU。P域表示第二指示信息，即用于向终端设备请求该第二数据的接收状态，SI域、SN域、R域和数据域的指示作用与图6中相同。
在一种实现方式中，该第一指示信息位于第二数据的包头中的D/C域，即重用现有数据包格式的包头中的D/C域。需要说明的是，控制PDU是接收端向发送端反馈的，对于组播业务而言，对应的PDU肯定为数据PDU，因此，不需要用D/C域来指示下行数据包是数据PDU还是控制PDU，此时，D/C域可以重用为P2域。
在一种实现方式中，该第一指示信息位于第二数据的包头中的SI域之后。也就是，将SI域之后的任一个R域设计为P2域，通过P2域表示第一指示信息。可选地，当该第二数据的包头包括SN域，该第一指示信息位于SI域与SN域之间。
在一种实现方式中，该第一指示信息位于第二数据的包头中的扩展域。也就是，在第二数据的包头中扩展一个字节，然后通过该扩展字节中的一个比特域来作为P2域。
作为示例，图7的(c)至图7的(e)是本申请实施例提供的第一指示信息的位置的三种示意图。其中P2域表示第一指示信息。
图7的(c)是在图7的(a)所示的AMD PDU格式的基础上，通过原来的D/C域表示第一指示信息。在图7的(c)中，第一指示信息位于原来的D/C域。
图7的(d)是在图7的(b)所示的AMD PDU格式的基础上，通过原来的R域表示第一指示信息。在图7的(d)中，第一指示信息位于SI域与SN域之间。
图7的(e)是在图7的(a)所示的AMD PDU格式的基础上，通过包头的扩展字节中的P2域表示第一指示信息。在图7的(e)中，第一指示信息位于扩展域。这种方式下，网络设备可以通过其他指示信息，例如，RRC信令等指示终端设备当前使用的数据包格式是图7的(e)还是图7的(a)所示的AMD PDU格式，以便终端设备可以按照正确的方式对接收到的数据包进行解析。
需要说明的是，在图7的(c)、(d)和(e)中，新设计的P2域可以称为第二轮询比特域，现有的P域可以称为第三轮询比特，即该第一指示信息为第二数据的包头的第二 轮询比特，该第二指示信息为第二数据的包头的第三轮询比特，该第二轮询比特和第三轮询比特不同。作为示例，在图7的(c)、(d)和(e)中，第一指示信息的具体指示方式可以为：当P2域取值为1时，表示需要该终端设备反馈第一状态报告，当P2域取值为0时，表示不需要反馈第一状态报告。第二指示信息的具体指示方式可以为：当P域取值为1时，表示需要该终端设备反馈第二状态报告，当P域取值为0时，表示不需要反馈第二状态报告，该第二状态报告用于指示第二数据的接收状态。这种指示方式仅为举例说明，本申请不做限定。
还应理解，图7的(c)、(d)和(e)中P2域的位置仅为示例，并不构成对本申请的限定。
方式三：
第二数据为RLC AMDPDU，该第二数据的包头包括第三指示信息，该第三指示信息用于指示该第二数据的包头是否存在扩展字节，该扩展字节包括第一指示信息和第二指示信息，该第二指示信息用于请求终端设备的第二状态报告，该第二状态报告用于指示第二数据是否成功接收。
具体而言，当第一RLC和第二RLC实体均被配置为AM时，第二数据为RLC AMD PDU，此时，第二数据的包头的比特域包括P域，可以重用现有数据包格式的P域为第三指示信息，用来指示该第二数据的包头是否存在扩展字节，当存在扩展字节时，通过扩展字节中的比特域分别来表示第一指示信息和第二指示信息。
在一种实现方式中，该第一指示信息和第二指示信息分别通过不同的比特指示。也就是，该扩展字节中的扩展域包括P1域和P2域，P1域表示第一指示信息，P2域表示第二指示信息，第一指示信息向终端设备请求PTM传输路径中的第一数据的接收状态，该第二指示信息用于向终端设备请求该第二数据的接收状态。
在一种实现方式中，该第一指示信息和第二指示信息分别为同一个比特的两个取值。也就是，该扩展字节中的扩展域包括P1，P1域的两个取值分别表示第一指示信息和第二指示信息，第一指示信息用于向终端设备请求PTM传输路径中的第一数据的接收状态，该第二指示信息用于向终端设备请求该第二数据的接收状态。
图8是本申请实施例提供的一些下行AMD PDU的格式的又一示意图，作为示例，图8的(a)和图8的(b)是本申请实施例提供的第一指示信息的位置的两种示意图。
在图8中，D/C域、SI域、SN域、R域和数据域的指示作用与图7中相同。当前标准中，P域表示第二指示信息，作为示例，本申请中的第三指示信息可以位于P域，即重用现有数据包格式的包头中的P域。
图8的(a)是在图7的(a)所示的AMD PDU格式的基础上，通过原来的P域表示第三指示信息，当P域取值为1的时候，表示存在扩展字节，当P域取值为0时，表示不存在扩展字节。进一步，当存在扩展字节时，该扩展字节中的扩展域包括P1域和P2域，P1域表示第一指示信息，P2域表示第二指示信息。当P1域取值为1时，表示需要该终端设备反馈第一状态报告，当P1域取值为0时，表示不需要反馈第一状态报告。当P2域取值为1时，表示需要该终端设备反馈第一状态报告，当P2域取值为0时，表示不需要反馈第一状态报告。当不存在扩展字节时，表示既不需要终端设备反馈第一状态报告，也不需要反馈第二状态报告。这种指示方式仅为举例说明，本申请不做限定。
图8的(b)是在图7的(a)所示的AMD PDU格式的基础上，通过原来的P域表示第三指示信息，当P域取值为1的时候，表示存在扩展字节，当P域取值为0时，表示不存在扩展字节。进一步，当存在扩展字节时，该扩展字节中的扩展域包括P1域，P1域表示第一指示信息和第二指示信息。当P1域取值为1时，表示需要该终端设备反馈第一状态报告，当P1域取值为0时，表示需要该终端设备反馈第二状态报告。当不存在扩展字节时，表示既不需要终端设备反馈第一状态报告，也不需要反馈第二状态报告。这种指示方式仅为举例说明，本申请不做限定。
应理解，扩展字节可以位于数据域之前的任何一个字节，例如，扩展字节可以位于字节3，如图8的(b)所示。或者，扩展字节也可以位于字节1或字节2，本申请对其位置不做限定。
可选地，该方法还包括：网络设备向终端设备发送第六指示信息，该第六指示信息用于指示第二数据的数据包格式。即指示PTP传输路径的数据包的包头格式。
例如，在方式三中，为AMD PDU引入新的包头格式后，网络设备可以指示终端设备第二数据的数据包的包头格式。继续以第二数据为SN域为12比特的AMD PDU(如图7的(a)所示)为例进行说明，网络设备可以通过第六指示信息指示第二数据的数据包的包头格式为如图7的(a)所示，或者图(8)中所示新设计的包头格式。该第六指示信息可以承载于RRC控制信令或RCL控制PDU，如果通过RRC控制信令来指示，则可以在向终端设备发送第一RLC实体的配置信息时携带第六指示信息。或者，网络设备也可以通过隐式指示，例如，网络设备配置终端设备的第二RLC实体为AM后，则第二数据的数据包为新设计的包头格式，或者对于第一MBS无线承载来说PTP传输路径中的数据均使用新设计的包头格式。可选地，对于第一数据，即PTM传输路径的数据的数据包格式，可以通过以下方式：
(1)协议可以定义PTM传输路径的数据均使用如图7的(a)所示的包头格式；
(2)协议可以定义PTM传输路径的数据包格式与PTP传输路径中保持一致；
(3)网络设备通过第七指示信息指示第一数据的数据包的格式，在这种方式中，第一数据和第二数据的数据包的包头的格式可能相同也可能不同。类似地，该第七指示信息可以承载于RRC控制信令或RCL控制PDU，如果通过RRC控制信令来指示，则可以在向终端设备发送第二RLC实体的配置信息时携带第七指示信息。
可选地，上文方式一和方式二中，当引入新的数据包格式(例如，图6的(e)所示的UMD PDU和/或图7的(e)所示的AMD PDU)后，也可以通过第六指示信息指示第二数据的数据包格式。
应理解，方式三以SN域为12比特的AMD PDU格式为例进行说明，若第二数据为SN域为18比特的AMD PDU的格式，也可以使用方式三中的方法，重用现有数据包格式的P域为第三指示信息。可选地，还可以进一步指示第一数据和第二数据的数据包格式。通过这种方式，终端设备在接收到第一数据或第二数据后，可以根据已经获知的包头格式对数据包的包头进行解析。
还应理解，图8的(a)和(b)中P2域的位置仅为示例，并不构成对本申请的限定。
还应理解，作为一种可能的实现方式，第二状态报告还可以用于指示第三数据的接收状态，该第三数据是网络设备通过PTP传输向终端设备发送的，且该第三数据与第二数据 不同。例如，该第三数据是在第二数据之前通过第一RLC实体接收的数据。也就是说，第二状态报告可以用于指示第二数据和第三数据是否成功接收。
在本申请的方案中，通过PTP传输路径中的第二数据来携带第一指示信息，既使得网络设备和终端设备的第二RLC实体可以支持AM工作模式，又可以减少终端设备和网络设备的信令开销。
可选地，该方法200还包括：S240，网络设备通过PTM传输方式向终端设备发送第一数据。
应理解，第一数据可以在第一指示信息之前发送，也可以与第一指示信息同时发送，本申请不做限定。
例如，网络设备先通过RRC信令、PDCP控制PDU、RLC控制PDU、MAC CE或DCI发送第一指示信息，再通过第一MBS无线承载发送第一数据。
又如，网络设备通过第一MBS无线承载发送第一数据和第二数据，该第二数据携带第一指示信息。
可选地，在S230中，终端设备向网络设备发送第一状态报告，可以通过以下方式实现：
方式A：
终端设备通过PTM传输路径对应的上行路径向网络设备发送第一状态报告。
例如，网络设备可以为每个终端设备配置对应于PTM传输路径的上行反馈路径，用于终端设备发送第一状态报告，第一状态报告的格式可以与第二状态报告的格式一致，即与现有标准中的规定保持一致。
可选地，对应于PTM传输路径的上行反馈路径可以与PTM下行传输路径共用一套RLC实体，即同一个RLC实体既可以发送数据也可以接收数据，可以执行双向通信。
图9是本申请提供的第一状态报告的两种格式的示意图。
图9的(a)是目前标准中规定的状态报告的格式。具体地，如图9的(a)所示，
该状态报告可以包括D/C域、控制PDU类型(control PDU type，CPT)域、确认序列号(acknowledgementsequence number，ACK_SN)域、非确认序列号(negative acknowledgementsequence number，NACK_SN)域、分段偏置(segmentation offset，SO)开始(SO start)域、分段偏置结束(SO end)域、非确认范围(NACK range)域和至少一个扩展(extension)域(如E1、E2或E3)。其中，D/C域的长度为1比特，CPT域的长度为3比特，D/C域和CPT域为该状态报告的包头。在该状态报告的有效载荷部分，ACK_SN的长度为12比特，每个E1域的长度为1比特，每个NACK_SN的长度为12比特，每个E2域的长度为1比特，每个E3域的长度分别为1比特，每个SO开始域的长度为16比特，每个SO结束域的长度为16比特。NACK范围的长度为8比特。
在图9中，D/C域用来指示该PDU为数据PDU还是控制PDU。CPT域用于指示控制PDU的类型，状态报告是控制PDU中的一种类型，目前只有这一种控制PDU。ACK_SN域用于指示下一个还没接收到但是接收端不认为是丢失的数据包的SN，也就是接收端当前接收到的最大的SN的下一个SN，即该状态报告所反馈的数据的范围。例如，接收端当前接收到的数据包的最大SN为99，则确认序列号域指示的值为100。E1域用于指示该域后面是否有一套(set)对应的NACK_SN、E1、E2、E3域。NACK_SN域用于指示丢 失的SDU或者SDU分段的SN号，即当前接收到的数据包中丢失的数据包的SN号。E2域用于指示该域后面是否有一套对应的SO开始和SO结束域，SO开始域用于指示一个SDU分段在原始SDU中开始的位置，SO结束域用于指示一个SDU分段在原始SDU中结束的位置。E3域用于指示该域后是否有一个NACK范围域，NACK范围用于指示从NACK_SN开始连续丢失的SDU的数目。
如上可以理解，该状态(status)报告包括一个状态PDU有效载荷(payload)和一个RLC控制PDU头；其中，RLC控制PDU头包括一个D/C域和一个CPT域，状态PDU有效载荷从RLC控制PDU头后面的第1个比特开始，此状态PDU有效载荷包括一个ACK_SN、一个E1域、0套或多套NACK_SN、E1、E2、E2域，此外，对于每套NACK_SN、E1、E2、E2域，其后还可能包括一对SO开始域和SO结束域、和/或包括每个NACK_SN的NACK范围域。
本申请中的第一状态报告可以与目前标准中规定的状态报告的格式相同。即第一状态报告为图9的(a)所示的格式。
方式B：
终端设备通过PTP的传输路径对应的上行路径发送第一状态报告。
具体而言，终端设备的第二RLC实体先将第一状态报告发送给第一RLC实体，或者，经过PDCP实体转发给第一RLC实体，经过第一RLC实体发送给网络设备，或者终端设备的第二RLC实体向第一RLC实体发送状态报告生成指示信息和第一数据的接收状态检测结果，指示第一RLC实体根据第一数据的接收状态检测结果生成第一状态报告并发送给网络设备。其中，发送给网络设备可以是指先发送给网络设备的第三RLC实体，第三RLC实体告知第四RLC实体，或者经过网络设备的PDCP实体告知第四RLC实体。需要说明的是，当第二数据为AMD PDU时，第一RLC可能会发送第二状态报告，以下方法可以用于区分第一RLC实体发送的第一状态报告和第二状态报告。区分第一状态报告和第二状态报告的信息可以称为状态报告指示信息、标识信息或者区分信息，另外，第一状态报告和第二状态报告也可以合并为一个状态报告或者组装到同一个PDU里面进行传输，并通过携带的状态报告指示信息区分出哪些是第一状态报告的内容，哪些是第二状态报告的内容。
在一种实现方式中，第一状态报告的包头包括状态报告指示信息，该状态报告指示信息用于指示该状态报告为第一状态报告。
在一种实现方式中，状态报告指示信息位于第一状态报告的包头中的CPT域，即重用现有数据包格式的包头中的CPT域，需要说明的是，CPT域占用3个比特，当前一个取值用于指示该控制PDU为状态报告。本申请中，可以默认当CPT域的第一取值指示该控制PDU为状态报告时，该第一取值还用于指示该状态报告为第二状态报告，当CPT域的第二取值指示该控制PDU为第二状态报告，第二取值与第一取值不同。例如，第一取值为000，第二取值为001。现有协议中，CPT域中000取值表示状态报告外，其他取值为预留取值，故本申请可以使用CPT域预留的取值，例如001至111中的至少一个来作为状态报告指示信息。举个例子，表1示出了3比特的CPT域的取值对应的描述，由表1可知，状态报告指示信息为CPT域的两个不同取值，当CPT域取值为000时，该控制PDU是用于指示第二数据的接收状态的第二状态报告，当CPT域取值为001时，该控制PDU 是用于指示第一数据的接收状态的第一状态报告。值得注意的是，表1中的内容针对的是新版本UE，或者支持MBS特性的UE，对于老版本UE或者不支持MBS特性的UE，例如版本17之前的UE，其按照现有协议中的表格中的描述对CPT域进行解析。需要说明的是，新版本UE可为支持新版本(高协议版本)的UE，老版本UE可为支持老版本(低协议版本)的UE，如上新版本UE和老版本UE是一种示例性叫法，本申请对此不做限制。
表1 CPT域的取值所对应的含义
取值 描述
000 该控制PDU为状态报告(STATUS PDU)，且该状态报告为第二状态报告
001 第一状态报告
010-111 预留(Reserved)，接收实体丢弃具有此编码的PDU
在一种实现方式中，该状态报告指示信息位于第一状态报告的包头中的扩展域。也就是，在第一状态报告的包头中扩展一个字节，然后通过该扩展字节中的一个比特域来作为状态报告指示信息域。
类似地，第二状态报告包括状态报告指示信息，该状态报告指示信息用于指示该状态报告为第二状态报告。状态报告指示信息可以位于第二状态报告的包头中的CPT域或扩展域。
可选地，第一状态报告和第二状态报告中的状态报告指示信息的位置可以是相同的，即通过状态报告指示信息的两个取值分别表示第一状态报告或第二状态报告。
作为示例，图9的(b)是本申请实施例提供的状态报告指示信息的位置的一种示意图。其中T域表示状态报告指示信息。
图9的(b)是在图9的(a)所示的状态报告的格式的基础上，通过在包头新增一个扩展字节，将扩展字节中的一个R域设计为T域，表示状态报告指示信息。作为示例，在图9的(b)中，状态报告指示信息的具体指示方式可以为：当D/C域取值为0，CPT域取值为0，T域进一步取值为1时，该状态报告为第一状态报告，当D/C域取值为0，CPT域取值为0，T域进一步取值为0时，该状态报告为第二状态报告。这种指示方式仅为举例说明，本申请不做限定。
应理解，图9的(b)在状态报告的包头中引入T域，通过T域表示状态报告指示信息，这仅为一种示例，本申请并不限定不可以通过其他的域表示状态报告指示信息，也不限定状态报告指示信息的域名不可以为其他名称。
应理解，如上T域可以位于新增的扩展字节从左边开始的第1个比特，或者也可以位于新增的扩展字节从右边开始的第1个比特，或者也可以是新增的扩展字节中的任一比特位置，本申请对T域的位置不做限制。
可选地，该方法200还包括：S250，网络设备根据第一状态报告确定是否重传该第一数据。
当第一状态报告中某一数据包的序列号对应的反馈内容为NACK信息时，网络设备确认该数据包未成功接收，从而重传该数据包。当第一状态报告中某一数据包的序列号对应的反馈内容为ACK信息时，网络设备确认该数据包成功接收，从而将不会重传该数据包。
所谓重传，也可以理解为重新发送。例如，网络设备可以将反馈的NACK序列号或者NACK范围所对应的数据包进行重传。
通过第一状态报告，网络设备在获知第一数据接收失败时，可以进行重传，有助于提高数据传输的可靠性。
可选地，该方法还包括：S201，网络设备向终端设备发送配置信息，该配置信息用于指示第二RLC实体为确认模式。
网络设备可以在RRC信令中携带配置信息，将终端设备的第二RLC配置为确认模式，使得终端设备能够进一步检测和/或解析第一指示信息。
在本申请的方案中，网络设备通过PTP传输方式向终端设备发送第一指示信息，该第一指示信息用于请求终端设备的第一状态报告，该第一状态报告用于指示通过PTM传输的第一数据是否成功接收，该终端设备可以根据第一指示信息对第一数据的接收状态进行检测和反馈。可选地，若第一状态报告指示第一数据的接收状态为失败，网络设备可以进行重传，有助于提高数据传输的可靠性。
图10是本申请实施例提供的一种通信方法的又一示意图。图10所示的方法300可以由图1至图4中所示的网络设备和终端设备执行。
S310，网络设备确定第一指示信息，该第一指示信息用于请求终端设备的第一状态报告，该第一状态报告用于指示第一数据是否成功接收。
关于第一指示信息、第一状态报告和第一数据的具体说明可以参考上文S210，在此不在赘述。
S320，网络设备通过PTM传输方式向该终端设备发送第一数据，或者说，网络设备通过第三RLC实体向该终端设备发送第一数据，该第一数据承载第一指示信息，该第三RLC实体对应PTM传输方式。相应地，终端设备通过PTM传输方式接收该第一数据，或者说，终端设备通过第二RLC实体接收第一数据，该第一数据承载第一指示信息，该第二RLC实体对应PTM传输方式。
也就是说，网络设备可以在PTM传输路径中的第一数据中直接携带第一指示信息，请求终端设备反馈第一数据的接收状态。
作为示例，该第一数据可以为AMD PDU，该第一数据的数据包格式与现有标准中的规定一致。例如，为图7的(a)所示的SN域为12比特的AMD PDU，或者如图7的(b)所示的SN域为18比特的AMD PDU。可以通过第一数据的数据包包头的P域表示第一指示信息。
本申请中，第一指示信息携带于第一数据中，和第一数据一起发送至终端设备，可以减小终端设备和网络设备的信令开销。
S330，终端设备确定是否向网络设备发送第一状态报告。
当终端设备通过PTM传输方式接收到第一指示信息时，由于第一指示信息用于请求终端设备的第一状态报告，因此，终端设备确定网络设备需要获取第一数据的接收状态，或者说，需要向网络设备反馈第一状态报告，终端设备可以进一步确定是否需要向网络设备发送第一状态报告，或者说，终端设备需要进一步确定是否响应第一指示信息。
当确定需要发送第一状态报告时，其可以执行如下至少一种：对第一数据进行检测，确定第一数据是否成功接收，触发第一状态报告，或生成第一状态报告。可选的，触发第 一状态报告可以等同于生成第一状态报告，也可以不等同于生成第一状态报告，例如，终端设备先触发第一状态报告，当有可用的上行资源时，再生成第一状态报告，比如组装用于发送的状态报告数据包。
当确定不需要发送第一状态报告时，终端设备将不会对第一数据的接收状态进行检测，也不会触发、生成和反馈第一状态报告，或者，终端设备可以检测第一数据的接收状态，触发、生成第一状态报告，但是不会反馈第一状态报告。
可选地，对第一数据的接收状态的检测和第一状态报告的生成可以由终端设备的第二RLC实体来实现。
可选地，第一状态报告还可以包括第一数据的标识信息，例如，SN和SI，通过该标识信息，网络设备可以得知第一状态报告是针对哪些数据包的接收状态的反馈。进一步地，终端设备向网络设备发送该第一状态报告。
在本申请的方案中，网络设备通过PTM传输方式向终端设备发送第一数据，该第一数据承载第一指示信息，该第一指示信息用于请求终端设备的第一状态报告，该第一状态报告用于指示该第一数据是否成功接收，该终端设备可以进一步确定是否需要向网络设备发送第一状态报告。可选地，网络设备可以获得第一状态报告，若第一状态报告指示第一数据的接收状态为失败，网络设备可以进行重传，有助于提高数据传输的可靠性。
应理解，在方法300中，终端设备的第一MBS无线承载可以不配置PTP传输路径，即该第一MBS无线承载包括第二RLC实体，不包括第一RLC实体，也可以是终端设备的第一MBS无线承载配置了PTM传输路径和PTP传输路径，即第一MBS无线承载包括第一RLC实体和第二RLC实体，其中，该第一RLC实体对应PTP传输方式，第二RLC实体对应PTM传输方式。换言之，只要终端设备的第一MBS无线承载配置了PTM传输路径即可，本申请对与第一MBS无线承载不同的其他无线承载的配置情况不做限定。
还应理解，本申请中可以请求和反馈通过PTM传输的第一数据的接收状态，使得网络设备和终端设备中对应PTM传输方式的RLC可以实现ARQ功能，即支持AM工作模式，有助于提升设备的性能。
在一种实现方式中，第一指示信息还可以指示不需要终端设备针对第一MBS无线承载反馈第一状态报告，可选的，第一指示信息可以包含至少1个比特，指示该指示信息针对哪个MBS无线承载，或者，可以包含1比特，其两个取值分别用于指示是否需要终端设备针对第一MBS无线承载反馈第一状态报告。其中，第一MBS无线承载可以是网络设备为终端设备配置的MBS无线承载中的一个或多个。
在一种实现方式中，该方法300还包括：S340，网络设备向第一终端设备发送第四指示信息，该第四指示信息用于指示第一终端设备不响应第一指示信息；或者，向第一终端设备发送第五指示信息，该第五指示信息用于指示第一终端设备响应第一指示信息。其中，方法300中的终端设备包括第一终端设备，也就是，第一终端设备为所有接收MBS业务的终端设备中的至少一个。其中，第四指示信息或第五指示信息可以由RRC信令携带。
应理解，“不响应”，可以理解为忽略或停止响应，“不响应第一指示信息”可以理解为忽略第一数据的包头中的P域或者不发送第一状态报告。具体来说，无论第一指示信息指示的内容为反馈第一状态报告还是不需要反馈第一状态报告，终端设备都不会发送第一状态报告。“响应第一指示信息”可以理解为解析第一数据的包头中的P域，或者根据 第一指示信息的指示内容确定是否发送第一状态报告。具体来说，当第一指示信息指示需要反馈第一状态报告时，则终端设备根据第一指示信息发送第一状态报告，当第一指示信息指示不需要反馈第一状态报告时，则终端设备不发送第一状态报告。
对应地，PTM传输路径中的终端设备中的第一终端设备可以接收第四指示信息；或者接收第五指示信息。此时，S330，终端设备确定是否向网络设备发送第一状态报告，包括：根据第四指示信息确定不向网络设备发送第一状态报告；或者，根据第一指示信息和第五指示信息确定是否向网络设备发送第一状态报告。
应理解，网络设备可以选择发送第四指示信息和第五指示信息中的一种，例如，网络设备向不需要响应第一指示信息的终端设备组#A中的每个发送第四指示信息，如此，对于接收到第四指示信息的终端设备，其将会忽略第一指示信息，不发送第一状态报告；对于没有接收到第四指示信息的终端设备，其可以默认响应第一指示信息，即根据第一指示信息确定是否反馈第一状态报告。或者，网络设备向需要响应第一指示信息的终端设备组#B中的每个发送第五指示信息，如此，对于接收到第五指示信息的终端设备，其将会根据第一指示信息的指示内容确定是否发送第一状态报告；对于没有接收到第五指示信息的终端设备，其可以默认不响应第一指示信息，即不反馈第一状态报告。其中，终端设备组#A中包括至少一个终端设备，终端设备组#B中包括至少一个终端设备。终端设备组#A和终端设备组#B中的任一个可以视为第一终端设备的一例，所有接收MBS业务的终端设备包括终端设备组#A和终端设备组#B的终端设备。
可选地，网络设备也可以向不需要响应第一指示信息的终端设备组#A中的每个发送第四指示信息，并向需要响应第一指示信息的终端设备组#B中的每个发送第五指示信息。
在一种实现方式中，第四指示信息和第五指示信息可以是同一个指示信息的不同取值，例如，当取值为1时表示第四指示信息，取值为0时表示第五指示信息。
本申请实施例中，当网络设备通过PTM传输方式向终端设备发送第一数据和第一指示信息时，可以进一步向其中的第一终端设备发送第四指示信息或第五指示信息，指示第一终端设备响应或不响应第一指示信息。如此，可以实现所有接收MBS业务的终端设备中的全部或部分终端设备反馈第一数据的接收状态，例如，对于网络设备认为的不需要反馈的终端设备，可以使得其不反馈第一数据的接收状态，有助于减小不必要的信令开销，也可提升网络设备调控灵活性。
可选地，第四指示信息或第五指示信息可以承载于以下至少一种：RRC信令、PDCP控制PDU、RLC控制PDU、MAC CE或DCI。
应理解，第四指示信息和第五指示信息可以承载于相同的消息，也可以承载于不同的消息，本申请不做限定。
在一种实现方式中，S330，终端设备确定是否向网络设备发送第一MBS无线承载的第一状态报告，包括：终端设备根据第一MBS无线承载是否配置第一RLC实体确定是否向该网络设备发送第一状态报告，该第一RLC实体对应点到点PTP传输方式。
具体来说，上述接收PTM传输的终端设备中的每个可以根据自身第一MBS无线承载中RLC的配置情况确定是否发送第一状态报告，当其第一MBS无线承载配置了第一RLC实体时，不响应第一指示信息，或者说，不向网络设备发送第一状态报告，当其第一MBS无线承载未配置第一RLC实体时，响应第一指示信息，或者说，根据第一指示信息的指 示内容确定是否向网络设备发送第一MBS无线承载的第一状态报告。
为了便于说明，第一MBS无线承载配置了第一RLC实体的任一个终端设备可以称为第一类终端设备，第一MBS无线承载未配置第一RLC实体的任一个终端设备可以称为第二类终端设备，第一类终端设备确定自身第一MBS无线承载配置了第一RLC实体，也就是说，第一类终端设备还可以通过PTP传输路径接收和发送数据，因此，第一类终端设备可以不向网络设备发送第一MBS无线承载的第一状态报告。在这种情况下，如果网络设备需要第一类终端设备反馈第一状态报告，可以通过第一MBS无线承载的PTP传输路径来完成，例如，网络设备与第一类终端设备执行方法200中的流程来获得第一状态报告。此时，方法300和方法200可以配合使用，方法300包括方法200的流程。第二类终端设备确定自身第一MBS无线承载未配置第一RLC实体，也就是说，对于该第一MBS无线承载中的信息而言，第二类终端设备不能通过PTP传输路径与网络设备通信，因此，第二类终端设备可以根据第一指示信息的指示内容确定是否向网络设备发送第一MBS无线承载的第一状态报告。这里终端设备确定自身配置或者未配置第一RLC实体，是针对与第二RLC实体相同的无线承载，即第一MBS无线承载中的配置而言的，而并不包括判断其他无线承载是否配置了第一RLC实体。
应理解，当……时，与如果……、在……情况下、在……时等描述方式可以相互替换。
因此，本申请实施例通过网络设备指示或终端设备自行确定的方式，使得终端设备能够获知是否需要反馈第一数据的状态报告，具有更高的灵活性。
可选地，在终端设备确定向网络设备发送第一状态报告时，该方法还包括：S350，终端设备向网络设备发送第一状态报告。具体而言，可以通过上文方法200中的方式A或方式B实现，其中，方式A可以用于未配置第一RLC实体的终端设备，方式B可以用于配置了第一RLC实体和第二RLC实体的终端设备。
可选地，该方法300还包括：S360，网络设备根据第一状态报告确定是否重传该第一数据。
当第一状态报告中某一数据包的序列号对应的反馈内容为NACK信息时，则网络设备确认该数据包未成功接收，从而重传该数据包。当第一状态报告中某一数据包的序列号对应的反馈内容为ACK信息时，则网络设备确认该数据包成功接收，从而将不会重传该数据包。
可选地，该方法300还包括：S301，网络设备向终端设备发送配置信息，该配置信息用于指示第二RLC实体为确认模式。
网络设备可以在RRC信令中携带配置信息，将终端设备的第二RLC配置为确认模式，使得终端设备能够进一步检测和/或解析第一指示信息。
以上对本申请提供的通信方法进行了详细说明，下面介绍本申请提供的通信装置。
图11是本申请提供的通信装置400的示意性框图。该装置400包括发送单元410、处理单元420和接收单元430。发送单元410和接收单元430可以实现相应的通信功能，处理单元420用于进行数据处理。发送单元410和接收单元430还可以称为通信接口或通信单元。
可选地，该装置400还可以包括存储单元，该存储单元可以用于存储指令和/或数据，处理单元420可以读取存储单元中的指令和/或数据，以使得装置实现前述方法实施例。
该装置400可以用于执行上文方法实施例中设备(如上述网络设备、终端设备等)所执行的动作，这时，该装置400可以为设备或者可配置于设备的部件，发送单元410和接收单元430用于执行上文方法实施例中设备的收发相关的操作，处理单元420用于执行上文方法实施例中设备处理相关的操作。
作为一种设计，该装置400用于执行上文方法200实施例中网络设备所执行的动作。
处理单元420，用于确定第一指示信息，该第一指示信息用于请求终端设备的第一状态报告，该第一状态报告用于指示第一数据是否成功接收，该第一数据是通过点到多点PTM传输方式向终端设备发送的数据；
发送单元410，用于通过点到点PTP传输方式向终端设备发送该第一指示信息。
可选地，该第一指示信息承载于以下至少一种：RRC信令、PDCP控制PDU、RLC控制PDU、MAC CE或DCI。
可选地，发送单元410具体用于：通过PTP传输方式向终端设备发送第二数据，该第二数据承载该第一指示信息。
可选地，该第二数据为RLC非确认模式数据UMD PDU，第二数据的包头包括该第一指示信息；或者，该第二数据为RLC确认模式数据AMD PDU，第二数据的包头包括该第一指示信息和第二指示信息，第二指示信息用于请求终端设备的第二状态报告，该第二状态报告用于指示第二数据是否成功接收；或者，该第二数据为RLC确认模式数据AMD PDU，该第二数据的包头包括第三指示信息，该第三指示信息用于指示包头存在扩展域，扩展域包括所述第一指示信息和第二指示信息，该第二指示信息用于请求终端设备的第二状态报告，该第二状态报告用于指示第二数据是否成功接收。
可选地，接收单元430，用于接收所述第一状态报告。
可选地，处理单元420还用于：根据第一状态报告确定是否重传第一数据。
该装置400可实现对应于根据本申请实施例的方法实施例中的网络设备执行的步骤或者流程，该装置400可以包括用于执行方法实施例中的网络设备执行的方法200的单元。并且，该装置400中的各单元和上述其他操作和/或功能分别为了实现方法实施例中的网络设备中的方法实施例的相应流程。
其中，当该装置400用于执行图5中的方法时，发送单元410可用于执行方法中的发送信息的步骤，如步骤S201、S220和S2240；接收单元430可用于执行方法中的接收信息的步骤，如步骤S230；处理单元420可用于执行方法中的处理步骤，如步骤S210和S250。
应理解，各单元执行上述相应步骤的具体过程在上述方法实施例中已经详细说明，为了简洁，在此不再赘述。
作为另一种设计，该装置400用于执行上文方法200实施例中终端设备所执行的动作。
接收单元430，用于通过点到点PTP传输方式接收第一指示信息，该第一指示信息用于请求终端设备的第一状态报告，该第一状态报告用于指示第一数据是否成功接收，该第一数据是通过点到多点PTM传输方式接收的来自于网络设备的数据；
处理单元420，用于根据该第一指示信息向网络设备发送第一状态报告。
可选地，该第一指示信息承载于以下至少一种：RRC信令、PDCP控制PDU、RLC控制PDU、MAC CE或DCI。
可选地，接收单元430具体用于：通过PTP传输方式接收来自于网络设备的第二数据， 该第二数据承载第一指示信息。
可选地，该第二数据为RLC非确认模式数据UMD PDU，第二数据的包头包括该第一指示信息；或者，该第二数据为RLC确认模式数据AMD PDU，第二数据的包头包括该第一指示信息和第二指示信息，第二指示信息用于请求终端设备的第二状态报告，该第二状态报告用于指示第二数据是否成功接收；或者，该第二数据为RLC确认模式数据AMD PDU，该第二数据的包头包括第三指示信息，该第三指示信息用于指示包头存在扩展域，扩展域包括所述第一指示信息和第二指示信息，该第二指示信息用于请求终端设备的第二状态报告，该第二状态报告用于指示第二数据是否成功接收。
该装置400可实现对应于根据本申请实施例的方法实施例中的终端设备执行的步骤或者流程，该装置400可以包括用于执行方法实施例中的终端设备执行的方法200的单元。并且，该装置400中的各单元和上述其他操作和/或功能分别为了实现方法实施例中的终端设备中的方法实施例的相应流程。
其中，当该装置400用于执行图5中的方法时，发送单元410可用于执行方法中的发送信息的步骤，如步骤S230；接收单元430可用于执行方法中的接收信息的步骤，如步骤S201、S220和S240；处理单元420可用于执行方法中的处理步骤，如步骤S230。
应理解，各单元执行上述相应步骤的具体过程在上述方法实施例中已经详细说明，为了简洁，在此不再赘述。
作为另一种设计，该装置400用于执行上文方法300实施例中网络设备所执行的动作。
处理单元420，用于确定第一指示信息，该第一指示信息用于请求终端设备的第一状态报告，该第一状态报告用于指示第一数据是否成功接收；
发送单元410，用于通过PTM传输方式向终端设备发送该第一数据，该第一数据承载第一指示信息。
可选地，该终端设备包括第一终端设备，所述发送单元410还用于：向第一终端设备发送第四指示信息，该第四指示信息用于指示第一终端设备不响应第一指示信息；或者，向第一终端设备发送第五指示信息，该第五指示信息用于指示第一终端设备响应第一指示信息。
可选地，该第四指示信息或第五指示信息承载于以下至少一种：RRC信令、PDCP控制PDU、RLC控制PDU、MAC CE或DCI。
可选地，接收单元430，用于接收所述第一状态报告。
可选地，处理单元420还用于：根据第一状态报告确定是否重传第一数据。
该装置400可实现对应于根据本申请实施例的方法实施例中的网络设备执行的步骤或者流程，该装置400可以包括用于执行方法实施例中的网络设备执行的方法300的单元。并且，该装置400中的各单元和上述其他操作和/或功能分别为了实现方法实施例中的网络设备中的方法实施例的相应流程。
其中，当该装置400用于执行图10中的方法时，发送单元410可用于执行方法中的发送信息的步骤，如步骤S301、S320和S3240；接收单元430可用于执行方法中的接收信息的步骤，如步骤S350；处理单元420可用于执行方法中的处理步骤，如步骤S310和S360。
应理解，各单元执行上述相应步骤的具体过程在上述方法实施例中已经详细说明，为了简洁，在此不再赘述。
作为另一种设计，该装置400用于执行上文方法300实施例中终端设备所执行的动作。
接收单元430，用于通过点到多点PTM传输方式接收第一数据，该第一数据承载第一指示信息，该第一指示信息用于请求终端设备的第一状态报告，该第一状态报告用于指示第一数据是否成功接收；
处理单元420，用于确定是否向网络设备发送该第一状态报告。
可选地，处理单元420具体用于：根据是否配置第一无线链路控制RLC实体确定是否向网络设备发送第一状态报告，该第一RLC实体对应点到点PTP传输方式。
可选地，处理单元420具体用于：当配置了第一RLC实体时，不向网络设备发送第一状态报告；当未配置第一RLC实体时，向网络设备发送第一状态报告。
可选地，处理单元420具体用于：根据来自网络设备的第四指示信息确定不向网络设备发送该第一状态报告，该第四指示信息用于指示不响应该第一指示信息；或者，根据来自网络设备的第五指示信息确定向网络设备发送该第一状态报告，该第五指示信息用于指示响应该第一指示信息。
可选地，该第四指示信息或第五指示信息承载于以下至少一种：RRC信令、PDCP控制PDU、RLC控制PDU、MAC CE或DCI。
该装置400可实现对应于根据本申请实施例的方法实施例中的终端设备执行的步骤或者流程，该装置400可以包括用于执行方法实施例中的终端设备执行的方法300的单元。并且，该装置400中的各单元和上述其他操作和/或功能分别为了实现方法实施例中的终端设备中的方法实施例的相应流程。
其中，当该装置400用于执行图10中的方法时，发送单元410可用于执行方法中的发送信息的步骤，如步骤S301、S320和S3240；接收单元430可用于执行方法中的接收信息的步骤，如步骤S350；处理单元420可用于执行方法中的处理步骤，如步骤S310和S360。
应理解，各单元执行上述相应步骤的具体过程在上述方法实施例中已经详细说明，为了简洁，在此不再赘述。
图12示出了本申请实施例提供的通信装置500，该装置500可以为方法200或方法300中所述的网络设备或终端设备，该装置500可以采用如图12所示的硬件架构。该装置可以包括处理器510、收发器520和存储器530，该处理器510、收发器520和存储器530通过内部连接通路互相通信。图11中的处理单元420所实现的相关功能可以由处理器510来实现，图11中的接收单元430和发送单元410所实现的相关功能可以由处理器510控制收发器520来实现。
该处理器510可以包括是一个或多个处理器，例如包括一个或多个CPU，在处理器是一个CPU的情况下，该CPU可以是单核CPU，也可以是多核CPU。
该收发器520用于发送和接收数据和/或信息，以及接收数据和/或信息。该收发器可以包括发射器和接收器，发射器用于发送数据和/或信息，接收器用于接收数据和/或信息。
该存储器530包括但不限于是随机存取存储器(random access memory，RAM)、只读存储器(read-only memory，ROM)、可擦除可编程只读存储器(erasable programmable read-only memory，EPROM)、紧凑型光盘只读储存器(compact disc read-only memory，CD-ROM)，该存储器530用于存储相关指令及数据。
存储器530用于存储装置的程序代码和数据，可以为单独的器件或集成在处理器510中。
具体地，所述处理器510用于控制收发器与终端设备进行信息传输。具体可参见方法实施例中的描述，在此不再赘述。
可以理解的是，图12仅仅示出了装置的简化设计。在实际应用中，装置还可以分别包含必要的其他元件，包含但不限于任意数量的收发器、处理器、控制器、存储器等，而所有可以实现本申请的装置都在本申请的保护范围之内。
在一种可能的设计中，装置500可以被替换为芯片装置，例如可以为可用于装置中的通信芯片，用于实现装置中处理器510的相关功能。该芯片装置可以为实现相关功能的现场可编程门阵列，专用集成芯片，系统芯片，中央处理器，网络处理器，数字信号处理电路，微控制器，还可以采用可编程控制器或其他集成芯片。该芯片中，可选的可以包括一个或多个存储器，用于存储程序代码，当所述代码被执行时，使得处理器实现相应的功能。
应理解，当上述装置400或装置500为芯片或者芯片系统时，其收发器或者收发单元可以是输入输出接口，其中，接收器或者接收单元可以理解为输入接口，发送器或者发送单元可以理解为输出接口。
本申请还提供了一种计算机可读介质，其上存储有计算机程序，该计算机程序被计算机执行时实现上述任一方法实施例的功能。
本申请还提供了一种计算机程序产品，该计算机程序产品被计算机执行时实现上述任一方法实施例的功能。
本申请还提供一种系统，其包括前述方法200或方法300中的一个或多个终端设备以及一个或多个网络设备。
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。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述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所述计算机指令时，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，高密度数字视频光盘(digital video disc，DVD))、或者半导体介质(例如，固态硬盘(solid state disk，SSD))等。
在本申请实施例中，“示例的”、“例如”等词用于表示作例子、例证或说明。本申请中被描述为“示例”的任何实施例或设计方案不应被解释为比其它实施例或设计方案更优选或更具优势。确切而言，使用示例的一词旨在以具体方式呈现概念。
应理解，说明书通篇中提到的“实施例”意味着与实施例有关的特定特征、结构或特性包括在本申请的至少一个实施例中。因此，在整个说明书各个实施例未必一定指相同的实 施例。此外，这些特定的特征、结构或特性可以任意适合的方式结合在一个或多个实施例中。
应理解，在本申请的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。本申请中所有节点、消息的名称仅仅是本申请为描述方便而设定的名称，在实际网络中的名称可能不同，不应理解本申请限定各种节点、消息的名称，相反，任何具有和本申请中用到的节点或消息具有相同或类似功能的名称都视作本申请的方法或等效替换，都在本申请的保护范围之内。
还应理解，在本申请中，“当…时”、“若”以及“如果”均指在某种客观情况下UE或者基站会做出相应的处理，并非是限定时间，且也不要求UE或基站实现时一定要有判断的动作，也不意味着存在其它限定。
需要说明的是，本申请实施例中，“预先设定”、“预先配置”等可以通过在设备(例如，终端设备)中预先保存相应的代码、表格或其他可用于指示相关信息的方式来实现，本申请对于其具体的实现方式不做限定，例如本申请实施例中预设的规则、预设的常数等。
另外，本文中术语“系统”和“网络”在本文中常被可互换使用。本文中术语“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。
本文中术语“……中的至少一个”或“……中的至少一种”，表示所列出的各项的全部或任意组合，例如，“A、B和C中的至少一种”，可以表示：单独存在A，单独存在B，单独存在C，同时存在A和B，同时存在B和C，同时存在A、B和C这六种情况。本文中的“至少一个”表示一个或者多个。“多个”表示两个或者两个以上。
应理解，在本申请各实施例中，“与A相应的B”表示B与A相关联，根据A可以确定B。但还应理解，根据A确定B并不意味着仅仅根据A确定B，还可以根据A和/或其它信息确定B。术语“包括”、“包含”、“具有”及它们的变形都意味着“包括但不限于”，除非是以其他方式另外特别强调。
应理解，在本申请的各种实施例中，第一、第二以及各种数字编号仅为描述方便进行的区分，并不用来限制本申请实施例的范围。例如，区分不同的信息等。
本领域普通技术人员可以意识到，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，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间 接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (39)

  1. 一种通信方法，其特征在于，包括：
    确定第一指示信息，所述第一指示信息用于请求终端设备的第一状态报告，所述第一状态报告用于指示第一数据是否成功接收，所述第一数据是通过点到多点PTM传输方式向所述终端设备发送的数据；
    通过点到点PTP传输方式向所述终端设备发送所述第一指示信息。
  2. 根据权利要求1所述的方法，其特征在于，所述第一指示信息承载于以下至少一种：无线资源控制RRC信令、分组数据汇聚协议PDCP控制协议数据单元PDU、无线链路控制RLC控制PDU、媒体接入控制控制元素MAC CE或下行控制信息DCI。
  3. 根据权利要求1所述的方法，其特征在于，所述通过PTP传输方式向所述终端设备发送第一指示信息，包括：
    通过PTP传输方式向所述终端设备发送第二数据，所述第二数据承载所述第一指示信息。
  4. 根据权利要求3所述的方法，其特征在于，
    所述第二数据为RLC非确认模式数据UMD PDU，所述第二数据的包头包括所述第一指示信息；或者，
    所述第二数据为RLC确认模式数据AMD PDU，所述第二数据的包头包括所述第一指示信息和第二指示信息，所述第二指示信息用于请求所述终端设备的第二状态报告，所述第二状态报告用于指示所述第二数据是否成功接收；或者，
    所述第二数据为RLC确认模式数据AMD PDU，所述第二数据的包头包括第三指示信息，所述第三指示信息用于指示所述包头存在扩展域，所述扩展域包括所述第一指示信息和第二指示信息，所述第二指示信息用于请求所述终端设备的第二状态报告，所述第二状态报告用于指示所述第二数据是否成功接收。
  5. 根据权利要求1至4中任一项所述的方法，其特征在于，所述方法还包括：
    接收所述第一状态报告；和/或，
    根据所述第一状态报告确定是否重传所述第一数据。
  6. 一种通信方法，其特征在于，包括：
    通过点到点PTP传输方式接收第一指示信息，所述第一指示信息用于请求终端设备的第一状态报告，所述第一状态报告用于指示第一数据是否成功接收，所述第一数据是通过点到多点PTM传输方式接收的来自于网络设备的数据；
    根据所述第一指示信息向所述网络设备发送所述第一状态报告。
  7. 根据权利要求6所述的方法，其特征在于，所述第一指示信息承载于以下至少一种：无线资源控制RRC信令、分组数据汇聚协议PDCP控制协议数据单元PDU、无线链路控制RLC控制PDU、媒体接入控制控制元素MAC CE或下行控制信息DCI。
  8. 根据权利要求6所述的方法，其特征在于，所述通过PTP传输方式接收第一指示信息，包括：
    通过PTP传输方式接收来自于所述网络设备的第二数据，所述第二数据承载所述第一 指示信息。
  9. 根据权利要求8所述的方法，其特征在于，
    所述第二数据为RLC非确认模式数据UMD PDU，所述第二数据的包头包括所述第一指示信息；或者，
    所述第二数据为RLC确认模式数据AMD PDU，所述第二数据的包头包括所述第一指示信息和第二指示信息，所述第二指示信息用于请求所述终端设备的第二状态报告，所述第二状态报告用于指示所述第二数据是否成功接收；或者，
    所述第二数据为RLC确认模式数据AMD PDU，所述第二数据的包头包括第三指示信息，所述第三指示信息用于指示所述包头存在扩展域，所述扩展域包括所述第一指示信息和第二指示信息，所述第二指示信息用于请求所述终端设备的第二状态报告，所述第二状态报告用于指示所述第二数据是否成功接收。
  10. 一种通信方法，其特征在于，包括：
    确定第一指示信息，所述第一指示信息用于请求终端设备的第一状态报告，所述第一状态报告用于指示第一数据是否成功接收；
    通过PTM传输方式向所述终端设备发送所述第一数据，所述第一数据承载所述第一指示信息。
  11. 根据权利要求10所述的方法，其特征在于，所述终端设备包括第一终端设备，所述方法还包括：
    向所述第一终端设备发送第四指示信息，所述第四指示信息用于指示所述第一终端设备不响应所述第一指示信息；或者，
    向所述第一终端设备发送第五指示信息，所述第五指示信息用于指示所述第一终端设备响应所述第一指示信息。
  12. 根据权利要求11所述的方法，其特征在于，所述第四指示信息或所述第五指示信息承载于以下至少一种：无线资源控制RRC信令、分组数据汇聚协议PDCP控制协议数据单元PDU、无线链路控制RLC控制PDU、媒体接入控制控制元素MAC CE或下行控制信息DCI。
  13. 根据权利要求10至12中任一项所述的方法，其特征在于，所述方法还包括：
    接收所述第一状态报告；和/或，
    根据所述第一状态报告确定是否重传所述第一数据。
  14. 一种通信方法，其特征在于，包括：
    通过点到多点PTM传输方式接收第一数据，所述第一数据承载第一指示信息，所述第一指示信息用于请求终端设备的第一状态报告，所述第一状态报告用于指示所述第一数据是否成功接收；
    确定是否向网络设备发送所述第一状态报告。
  15. 根据权利要求14所述的方法，其特征在于，所述确定是否向网络设备发送所述第一状态报告，包括：
    根据是否配置第一无线链路控制RLC实体确定是否向所述网络设备发送所述第一状态报告，所述第一RLC实体对应点到点PTP传输方式。
  16. 根据权利要求15所述的方法，其特征在于，所述根据是否配置第一RLC实体确 定是否向所述网络设备发送所述第一状态报告，包括：
    当配置了所述第一RLC实体时，不向所述网络设备发送所述第一状态报告；
    当未配置所述第一RLC实体时，向所述网络设备发送所述第一状态报告。
  17. 根据权利要求14所述的方法，其特征在于，所述确定是否向网络设备发送所述第一状态报告，包括：
    根据来自所述网络设备的第四指示信息确定不向所述网络设备发送所述第一状态报告，所述第四指示信息用于指示不响应所述第一指示信息；或者，
    根据来自所述网络设备的第五指示信息确定向所述网络设备发送所述第一状态报告，所述第五指示信息用于指示响应所述第一指示信息。
  18. 根据权利要求17所述的方法，其特征在于，所述第四指示信息或所述第五指示信息承载于以下至少一种：无线资源控制RRC信令、分组数据汇聚协议PDCP控制协议数据单元PDU、无线链路控制RLC控制PDU、媒体接入控制控制元素MAC CE或下行控制信息DCI。
  19. 一种通信装置，其特征在于，包括：
    处理单元，用于确定第一指示信息，所述第一指示信息用于请求终端设备的第一状态报告，所述第一状态报告用于指示第一数据是否成功接收，所述第一数据是通过点到多点PTM传输方式向所述终端设备发送的数据；
    发送单元，用于通过点到点PTP传输方式向所述终端设备发送所述第一指示信息。
  20. 根据权利要求19所述的装置，其特征在于，所述第一指示信息承载于以下至少一种：无线资源控制RRC信令、分组数据汇聚协议PDCP控制协议数据单元PDU、无线链路控制RLC控制PDU、媒体接入控制控制元素MAC CE或下行控制信息DCI。
  21. 根据权利要求19所述的装置，其特征在于，所述发送单元具体用于：
    通过PTP传输方式向所述终端设备发送第二数据，所述第二数据承载所述第一指示信息。
  22. 根据权利要求21所述的装置，其特征在于，
    所述第二数据为RLC非确认模式数据UMD PDU，所述第二数据的包头包括所述第一指示信息；或者，
    所述第二数据为RLC确认模式数据AMD PDU，所述第二数据的包头包括所述第一指示信息和第二指示信息，所述第二指示信息用于请求所述终端设备的第二状态报告，所述第二状态报告用于指示所述第二数据是否成功接收；或者，
    所述第二数据为RLC确认模式数据AMD PDU，所述第二数据的包头包括第三指示信息，所述第三指示信息用于指示所述包头存在扩展域，所述扩展域包括所述第一指示信息和第二指示信息，所述第二指示信息用于请求所述终端设备的第二状态报告，所述第二状态报告用于指示所述第二数据是否成功接收。
  23. 根据权利要求19至22中任一项所述的装置，其特征在于，所述装置还包括：
    接收单元，用于接收所述第一状态报告；和/或，
    所述处理单元还用于：根据所述第一状态报告确定是否重传所述第一数据。
  24. 一种通信装置，其特征在于，包括：
    接收单元，用于通过点到点PTP传输方式接收第一指示信息，所述第一指示信息用于 请求终端设备的第一状态报告，所述第一状态报告用于指示第一数据是否成功接收，所述第一数据是通过点到多点PTM传输方式接收的来自于网络设备的数据；
    处理单元，用于根据所述第一指示信息向所述网络设备发送所述第一状态报告。
  25. 根据权利要求24所述的装置，其特征在于，所述第一指示信息承载于以下至少一种：无线资源控制RRC信令、分组数据汇聚协议PDCP控制协议数据单元PDU、无线链路控制RLC控制PDU、媒体接入控制控制元素MAC CE或下行控制信息DCI。
  26. 根据权利要求24所述的装置，其特征在于，所述接收单元具体用于：
    通过PTP传输方式接收来自于所述网络设备的第二数据，所述第二数据承载所述第一指示信息。
  27. 根据权利要求26所述的装置，其特征在于，
    所述第二数据为RLC非确认模式数据UMD PDU，所述第二数据的包头包括所述第一指示信息；或者，
    所述第二数据为RLC确认模式数据AMD PDU，所述第二数据的包头包括所述第一指示信息和第二指示信息，所述第二指示信息用于请求所述终端设备的第二状态报告，所述第二状态报告用于指示所述第二数据是否成功接收；或者，
    所述第二数据为RLC确认模式数据AMD PDU，所述第二数据的包头包括第三指示信息，所述第三指示信息用于指示所述包头存在扩展域，所述扩展域包括所述第一指示信息和第二指示信息，所述第二指示信息用于请求所述终端设备的第二状态报告，所述第二状态报告用于指示所述第二数据是否成功接收。
  28. 一种通信装置，其特征在于，包括：
    处理单元，用于确定第一指示信息，所述第一指示信息用于请求终端设备的第一状态报告，所述第一状态报告用于指示第一数据是否成功接收；
    发送单元，用于通过PTM传输方式向所述终端设备发送所述第一数据，所述第一数据承载所述第一指示信息。
  29. 根据权利要求28所述的装置，其特征在于，所述终端设备包括第一终端设备，所述发送单元还用于：
    向所述第一终端设备发送第四指示信息，所述第四指示信息用于指示所述第一终端设备不响应所述第一指示信息；或者，
    向所述第一终端设备发送第五指示信息，所述第五指示信息用于指示所述第一终端设备响应所述第一指示信息。
  30. 根据权利要求29所述的装置，其特征在于，所述第四指示信息或所述第五指示信息承载于以下至少一种：无线资源控制RRC信令、分组数据汇聚协议PDCP控制协议数据单元PDU、无线链路控制RLC控制PDU、媒体接入控制控制元素MAC CE或下行控制信息DCI。
  31. 根据权利要求28至30中任一项所述的装置，其特征在于，所述装置还包括：
    接收单元，用于接收所述第一状态报告；和/或，
    所述处理单元还用于：根据所述第一状态报告确定是否重传所述第一数据。
  32. 一种通信装置，其特征在于，包括：
    接收单元，用于通过点到多点PTM传输方式接收第一数据，所述第一数据承载第一 指示信息，所述第一指示信息用于请求终端设备的第一状态报告，所述第一状态报告用于指示所述第一数据是否成功接收；
    处理单元，用于确定是否向网络设备发送所述第一状态报告。
  33. 根据权利要求32所述的装置，其特征在于，所述处理单元具体用于：
    根据是否配置第一无线链路控制RLC实体确定是否向所述网络设备发送所述第一状态报告，所述第一RLC实体对应点到点PTP传输方式。
  34. 根据权利要求33所述的装置，其特征在于，所述处理单元具体用于：
    当配置了所述第一RLC实体时，不向所述网络设备发送所述第一状态报告；
    当未配置所述第一RLC实体时，向所述网络设备发送所述第一状态报告。
  35. 根据权利要求32所述的装置，其特征在于，所述处理单元具体用于：
    根据来自所述网络设备的第四指示信息确定不向所述网络设备发送所述第一状态报告，所述第四指示信息用于指示不响应所述第一指示信息；或者，
    根据来自所述网络设备的第五指示信息确定向所述网络设备发送所述第一状态报告，所述第五指示信息用于指示响应所述第一指示信息。
  36. 根据权利要求35所述的装置，其特征在于，所述第四指示信息或所述第五指示信息承载于以下至少一种：无线资源控制RRC信令、分组数据汇聚协议PDCP控制协议数据单元PDU、无线链路控制RLC控制PDU、媒体接入控制控制元素MAC CE或下行控制信息DCI。
  37. 一种通信装置，其特征在于，包括至少一个处理器，所述至少一个处理器与至少一个存储器耦合，所述至少一个处理器用于执行所述至少一个存储器中存储的计算机程序或指令，以使得所述通信装置执行如权利要求1至18中任一项所述的方法。
  38. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质中存储有计算机指令，当所述计算机指令在计算机上运行时，如权利要求1至18中任一项所述的方法被执行。
  39. 一种计算机程序产品，其特征在于，所述计算机程序产品中包括计算机程序代码，当所述计算机程序代码在计算机上运行时，如权利要求1至18中任一项所述的方法被执行。
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