WO2023066049A1 - 一种通信方法及装置 - Google Patents

一种通信方法及装置 Download PDF

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Publication number
WO2023066049A1
WO2023066049A1 PCT/CN2022/124134 CN2022124134W WO2023066049A1 WO 2023066049 A1 WO2023066049 A1 WO 2023066049A1 CN 2022124134 W CN2022124134 W CN 2022124134W WO 2023066049 A1 WO2023066049 A1 WO 2023066049A1
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WIPO (PCT)
Prior art keywords
data
access network
indication information
network device
terminal device
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PCT/CN2022/124134
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English (en)
French (fr)
Inventor
张海森
许斌
李秉肇
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华为技术有限公司
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Publication of WO2023066049A1 publication Critical patent/WO2023066049A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/06—Reselecting a communication resource in the serving access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • 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 field of communication technologies, and in particular, to a communication method and device.
  • a multicast broadcast service (multicast and broadcast service, MBS) service is a service for multiple user equipments (user equipment, UE).
  • MBS services may include live broadcast services, public safety services, batch software update services, and the like.
  • the data server can send the MBS data to the core network device, the core network device can send the MBS data to the access network device, and the access network device can send the MBS data to one or more UEs receiving the MBS data.
  • the location of the UE may move as needed, so that the UE needs to be handed over from one access network device to another access network device.
  • the UE receives MBS, if the UE switches from an access network device that supports MBS to an access network device that does not support MBS, how to ensure reliable transmission of MBS is very important.
  • the embodiment of the present application discloses a communication method and device, which are used to improve the reliability of MBS transmission.
  • the first aspect discloses a communication method, which can be applied to a first access network device, and can also be applied to a module (for example, a chip) in the first access network device.
  • a module for example, a chip
  • This method of communication may include:
  • MBS radio bearer MBS radio bearer
  • first indication information is used to indicate a first data radio bearer (data radio bearer, DRB);
  • the first access network device may send the first data to the first terminal device through the first MRB, and may send the first indication information for indicating the first DRB to the first terminal device, and for indicating The second indication information of the first stop data packet, so that after the first terminal device receives the second indication information, it can judge whether the first condition is satisfied according to the first stop data packet, and if it is judged that the first condition is satisfied, it can Submit the second data transmitted through the first DRB. If it is judged that the first condition is not met, the second data transmitted through the first DRB cannot be submitted.
  • the device submits the second data after receiving the second data transmitted through the first DRB
  • it can be ensured that the data received and submitted by the first terminal device through the first MRB and the data received and submitted through the first DRB are continuous and The order is not disordered, so the reliability of MBS transmission can be improved.
  • configurations of the first DRB and the first MRB can be independent, which can prevent the configuration of the first DRB from being limited to the first MRB, thereby improving the flexibility of DRB configuration.
  • the first access network device sending the first indication information to the first terminal device may include:
  • the first access network device sending the second indication information to the first terminal device may include:
  • the first terminal device since the first terminal device is only switched from the first access network device to the second access network device, and the second access network device does not support MBS, it needs to meet the first condition Therefore, the first access network device can switch from the first access network device to the second access network device at the first terminal device, and the second access network device does not support MBS In this case, sending the first indication information used to indicate the first DRB and the second indication information used to indicate the first stop data packet to the first terminal device can avoid that the first terminal device is not connected by the first access network device.
  • the first access network device sends the first indication information and the second indication information to the first terminal device, which can reduce the transmission of unnecessary information, configure unnecessary DRB, and occupy radio bearer resources , so that the waste of transmission resources can be avoided, thereby saving transmission resources.
  • the first terminal device is switched from the first access network device to the second access network device, but when the second access network device supports MBS, the first access network device sends the first indication information to the first terminal device and the second indication information, causing handover delay.
  • the communication method may also include:
  • the second data is sent to the first terminal device through the first DRB, the first data and the second data belong to the same MBS service, and there is a corresponding relationship between the first MRB and the first DRB.
  • the first access network device may send the second data belonging to the same MBS service as the first data to the first terminal device through the first DRB, so that the first terminal device determines according to the second indication information that the first After the condition, the data transmitted through the first DRB can be committed.
  • the MRBs used by different MBS services are different, and the DRBs used by different unicast services are different, therefore, there is a corresponding relationship between the first MRB and the first DRB, so that the first terminal device is connected to the first access network that supports MBS.
  • the device When the device is switched to the second access network device that does not support MBS, and the first condition is met, it can be determined which MRB and which DRB transmit the data of the same MBS service according to the corresponding relationship, and then can be submitted through the first
  • the second data transmitted by the DRB can improve the reliability of the MBS transmission.
  • the communication method may also include:
  • the first access network device may send the correspondence between the first MRB and the first DRB to the first terminal device, so that the first terminal device may determine the relationship between the first MRB and the first DRB according to the third indication information.
  • the corresponding relationship between DRBs and then when the first access network device that supports MBS is switched to the second access network device that does not support MBS, and the first condition is met, the first The second data transmitted by the DRB can improve the reliability of the MBS transmission.
  • the communication method may also include:
  • the second data is sent to the first terminal device through the first DRB, and the first data and the second data belong to the same MBS service.
  • the first access network device may send the first DRB to the first terminal device through the first DRB, which belongs to the same MBS service as the first data.
  • Two data in the case of not receiving the indication information, do not send data to the first terminal device through the first DRB, it can ensure that the data received and submitted through the first MRB and the data received and submitted through the first DRB are continuous And there is no out-of-sequence, so that the reliability of the MBS can be improved, and at the same time, the behavior of the first terminal device to judge actions according to the status of multiple radio bearers can be reduced, and the corresponding judgment process can be completed through signaling to reduce the complexity of judgment.
  • the communication method may also include:
  • the first access network device may configure the first terminal device to submit the data transmitted through DRB after meeting the first condition, so that the first terminal device submits the data transmitted through DRB according to the configuration after meeting the first condition.
  • the data received and submitted through the first MRB and the data received and submitted through the first DRB can be avoided from being discontinuous or out of order, and the reliability of MSB transmission can be improved.
  • the first indication information is also used to indicate the corresponding relationship.
  • the correspondence between the first MRB and the first DRB can be indicated by multiplexing the first indication information, and no special message or signaling is required for indication, and the transmission of messages or signaling can be reduced, thereby Transmission resources can be saved.
  • the first condition may be:
  • the packet number of the first uncommitted data packet in the receiving window corresponding to the MRB is greater than or equal to the packet number of the stop data packet received through the MRB;
  • the first condition can ensure that the data delivery received before the stop data packet received by the MRB is completed, or the stop data packet received by the MRB and the data delivery received before the stop data packet are completed, which can avoid the MBS service data delivery When it reaches the high level, it is out of order, and it can largely guarantee that all data received through the MRB will be delivered, thereby improving the reliability of the MBS.
  • the second aspect discloses a communication method, which can be applied to a first terminal device, and can also be applied to a module (for example, a chip) in the first terminal device.
  • a communication method which can be applied to a first terminal device, and can also be applied to a module (for example, a chip) in the first terminal device.
  • the following uses the application to the first terminal device as an example for description.
  • This method of communication may include:
  • the second data received through the first DRB is submitted, and the first data and the second data belong to the same MBS service.
  • the first terminal device may receive the first data sent by the first access network device to the first terminal device through the first MRB, used to indicate the first indication information of the first DRB, and used to indicate the first data
  • the second indication information of a stop data packet can judge whether the first condition is met according to the first stop data packet, and if it is judged that the first condition is satisfied, the second data transmitted through the first DRB can be submitted, and after judging If the first condition is not met, the second data transmitted through the first DRB cannot be submitted, which can prevent the first terminal device from receiving the second data transmitted through the first DRB regardless of whether the first condition is met or not.
  • the data received and submitted by the first terminal device through the first MRB and the data received and submitted through the first DRB are continuous and not out of order, thereby improving the reliability of MBS transmission.
  • configurations of the first DRB and the first MRB can be independent, which can prevent the configuration of the first DRB from being limited to the first MRB, thereby improving the flexibility of DRB configuration.
  • submitting the second data received through the first DRB may include:
  • the submission is made through the first Second data received by the DRB.
  • the first terminal device when the first terminal device is switched from the first access network device to the second access network device, and the second access network device does not support MBS, it can meet the first condition Submitting the data transmitted through the DRB can ensure the reliability of the MBS when the first terminal device is handed over to the target access network device, but the target access network device does not support MBS.
  • the communication method may also include:
  • the second data submitted by the first terminal device received through the first DRB includes:
  • the first terminal device may receive the second data belonging to the same MBS service as the first data sent by the first access network device through the first DRB, and may determine that the first condition is met according to the second indication information Then submit the data transmitted through the first DRB.
  • the MRBs used by different MBS services are different, and the DRBs used by different unicast services are different, therefore, there is a corresponding relationship between the first MRB and the first DRB, so that the first terminal device is connected to the first access network that supports MBS.
  • the device When the device is switched to the second access network device that does not support MBS, and the first condition is met, it can be determined which MRB and which DRB transmit the data of the same MBS service according to the corresponding relationship, and then can be submitted through the first
  • the second data transmitted by the DRB can improve the reliability of the MBS transmission.
  • the communication method may also include:
  • the first terminal device may receive the correspondence between the first MRB and the first DRB from the first access network device, and may determine the relationship between the first MRB and the first DRB according to the third indication information. Then, when the first access network device that supports MBS is switched to the second access network device that does not support MBS, and the first condition is met, the data transmitted through the first DRB can be submitted according to the corresponding relationship. The second data can improve the reliability of MBS transmission.
  • the first terminal device submitting the second data received through the first DRB includes:
  • the first terminal device may send indication information to the first access network device to indicate that the first condition is satisfied, so that the first access network device may send the first terminal information to the first terminal through the first DRB according to the indication information.
  • the device sends the second data that belongs to the same MBS service as the first data, the first terminal device can receive the second data from the first access network device through the first DRB and submit it, and if the second data is not sent to the first access network device
  • indication information the data sent by the first access network device to the first terminal device through the first DRB cannot be received, and it can be ensured that the data received and submitted through the first MRB and the data received and submitted through the first DRB are continuous And there is no out-of-sequence, so that the reliability of the MBS can be improved, and at the same time, the behavior of the first terminal device to judge actions according to the status of multiple radio bearers can be reduced, and the corresponding judgment process can be completed through signaling to reduce the complexity of judgment.
  • the communication method may also include:
  • submitting the second data received through the first DRB includes:
  • the fifth indication information if it is determined according to the second indication information that the first condition is met, submit the second data received through the first DRB.
  • the first terminal device may receive the data transmitted by the DRB configured by the first access network device and submit it after satisfying the first condition, and may submit the data transmitted by the DRB after satisfying the first condition according to the configuration , the data received and submitted through the first MRB and the data received and submitted through the first DRB are prevented from being discontinuous or out of order, and the reliability of MSB transmission can be improved.
  • the first indication information is also used to indicate the corresponding relationship.
  • the correspondence between the first MRB and the first DRB can be indicated by multiplexing the first indication information, and no special message or signaling is required for indication, and the transmission of messages or signaling can be reduced, thereby Transmission resources can be saved.
  • the first condition may be:
  • the packet number of the first uncommitted data packet in the receiving window corresponding to the MRB is greater than or equal to the packet number of the stop data packet received through the MRB;
  • the first condition can ensure that the data delivery received before the stop data packet received by the MRB is completed, or the stop data packet received by the MRB and the data delivery received before the stop data packet are completed, which can avoid the MBS service data delivery When it reaches the high level, it is out of order, and it can largely guarantee that all data received through the MRB will be delivered, thereby improving the reliability of the MBS.
  • a third aspect discloses a communication device.
  • the communication device may be a first access network device, or may be a module (for example, a chip) in the first access network device.
  • the communication device may include:
  • a sending unit configured to send first data to the first terminal device through the first MRB, where the first data is MBS data;
  • the sending unit is further configured to send first indication information to the first terminal device, where the first indication information is used to indicate the first DRB;
  • the sending unit is further configured to send second indication information to the first terminal device, where the second indication information is used to indicate the first stop data packet, and the first stop data packet is sent through the first MRB.
  • the sending unit sending the first indication information to the first terminal device includes:
  • the sending unit sending the second indication information to the first terminal device includes:
  • the sending unit is further configured to send the second data to the first terminal device through the first DRB, the first data and the second data belong to the same MBS service, and there is an Correspondence.
  • the sending unit is further configured to send third indication information to the first terminal device, where the third indication information is used for the corresponding relationship.
  • the communication device may also include:
  • a receiving unit configured to receive fourth indication information from the first terminal device, where the fourth indication information is used to indicate that the first condition is met;
  • the sending unit is further configured to send second data to the first terminal device through the first DRB, where the first data and the second data belong to the same MBS service.
  • the sending unit is further configured to send fifth indication information to the first terminal device, where the fifth indication information is used to indicate that the data transmitted through the first DRB is submitted after the first condition is met.
  • the first indication information is also used to indicate the corresponding relationship.
  • the first condition may be:
  • the packet number of the first uncommitted data packet in the receiving window corresponding to the MRB is greater than or equal to the packet number of the stop data packet received through the MRB;
  • a fourth aspect discloses a communication device.
  • the communication device may be a first terminal device, or may be a module (for example, a chip) in the first terminal device.
  • the communication device may include:
  • a receiving unit configured to receive first data from the first access network device through the first MRB, where the first data is MBS data;
  • the receiving unit is further configured to receive first indication information from the first access network device, where the first indication information is used to indicate the first DRB;
  • the receiving unit is further configured to receive second indication information from the first access network device, where the second indication information is used to indicate the first stop data packet, and the first stop data packet is received through the first MRB;
  • the submitting unit is configured to submit the second data received through the first DRB when it is determined according to the second indication information that the first condition is satisfied, and the first data and the second data belong to the same MBS service.
  • the submitting unit is specifically configured to switch the first terminal device from the first access network device to the second access network device, the second access network device does not support MBS, and according to the second instruction When the information determines that the first condition is met, submit the second data received through the DRB.
  • the receiving unit is further configured to receive second data from the first access network device through the DRB, and there is a corresponding relationship between the first MRB and the first DRB;
  • the submitting unit submitting the second data received through the first DRB includes:
  • the receiving unit is further configured to receive third indication information from the first access network device, where the third indication information is used to indicate the corresponding relationship.
  • the submitting unit submitting the second data received through the first DRB includes:
  • the receiving unit is further configured to receive fifth indication information from the first access network device, where the fifth indication information is used to indicate that the data transmitted through the first DRB is submitted after satisfying the first condition;
  • the submitting unit is specifically configured to submit the second data received through the first DRB when the first condition is determined according to the second indication information according to the fifth indication information.
  • the first indication information is also used to indicate the corresponding relationship.
  • the first condition may be:
  • the packet number of the first uncommitted data packet in the receiving window corresponding to the MRB is greater than or equal to the packet number of the stop data packet received through the MRB;
  • the fifth aspect discloses a communication device.
  • the communication device may include a processor, configured to enable the communication device to implement the first aspect or the communication method disclosed in any implementation manner of the first aspect.
  • the communication device may further include a memory, and/or a transceiver, and the transceiver is used to receive information from other communication devices other than the communication device, and to output information to other communication devices other than the communication device.
  • the processor executes the computer program stored in the memory, the processor is made to execute the communication method disclosed in the first aspect or any implementation manner of the first aspect.
  • the sixth aspect discloses a communication device.
  • the communication device may include a processor, configured to enable the communication device to implement the second aspect or the communication method disclosed in any implementation manner of the second aspect.
  • the communication device may further include a memory, and/or a transceiver, and the transceiver is used to receive information from other communication devices other than the communication device, and to output information to other communication devices other than the communication device.
  • the processor executes the computer program stored in the memory, the processor is made to execute the second aspect or the communication method disclosed in any implementation manner of the second aspect.
  • a seventh aspect discloses a communication system, which includes the communication device of the fifth aspect and the communication device of the sixth aspect.
  • the eighth aspect discloses a computer-readable storage medium, on which a computer program or computer instruction is stored, and when the computer program or computer instruction is run, the communication method as disclosed in the above aspects is implemented.
  • a ninth aspect discloses a chip, including a processor, configured to execute a program stored in a memory, and when the program is executed, the chip executes the above method.
  • the memory is located outside the chip.
  • the tenth aspect discloses a computer program product, the computer program product includes computer program code, and when the computer program code is executed, the above communication method is executed.
  • the communications disclosed in the third, fourth, fifth, and sixth aspects above, the communication system disclosed in the seventh aspect, the computer-readable storage medium disclosed in the eighth aspect, and the chip disclosed in the ninth aspect, and the computer program product disclosed in the tenth aspect are all used to implement the first aspect of the present application and any possible implementation mode disclosure in the first aspect, or the second aspect and any possible implementation mode disclosure in the second aspect. Methods. Therefore, the beneficial effects that it can achieve can refer to the beneficial effects in the corresponding method, and will not be repeated here.
  • FIG. 1 is a schematic diagram of a network architecture disclosed in an embodiment of the present application.
  • FIG. 2 is a schematic diagram of MBS data transmission disclosed in an embodiment of the present application.
  • FIG. 3 is a schematic diagram of a user plane protocol stack structure for MBS transmission disclosed in an embodiment of the present application
  • FIG. 4 is a schematic flowchart of a cell measurement and handover method disclosed in an embodiment of the present application.
  • FIG. 5 is a schematic flowchart of a communication method disclosed in an embodiment of the present application.
  • Fig. 6 is a schematic diagram of switching a terminal device from a first access network device to a second access network device disclosed in an embodiment of the present application;
  • FIG. 7 is a schematic flowchart of another communication method disclosed in the embodiment of the present application.
  • FIG. 8 is a schematic flowchart of another communication method disclosed in the embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a communication device disclosed in an embodiment of the present application.
  • Fig. 10 is a schematic structural diagram of another communication device disclosed in the embodiment of the present application.
  • Fig. 11 is a schematic structural diagram of another communication device disclosed in the embodiment of the present application.
  • Fig. 12 is a schematic structural diagram of another communication device disclosed in the embodiment of the present application.
  • the embodiment of the present application discloses a communication method and device, which are used to improve the reliability of MBS transmission. Each will be described in detail below.
  • FIG. 1 is a schematic diagram of a network architecture disclosed in an embodiment of the present application.
  • the network structure may include a data server, one or more core network devices, two or more access network devices, and one or more terminal devices.
  • the data server is used to send MBS data to the core network equipment.
  • the core network device is used to send MBS data to the access network device through an MBS session (session) when the access network device supports MBS, and to send MBS data to the access network device through a unicast (nuicast) when the access network device does not support MBS.
  • a protocol data unit (protocol data unit, PDU) session sends MBS data to an access network device.
  • the access network device is configured to send the MBS data to the terminal device through the MRB if the MBS is supported, and send the MBS data to the terminal device through the DRB if the MBS is not supported.
  • the terminal device When the terminal device is within the range of an access network device that supports MBS, it receives MBS data from the access network device through MRB; when it is within the range of an access network device that does not support MBS, it receives data from the access network device through DRB. MBS data.
  • the terminal device When the terminal device switches from a source access network device supporting MBS to a target access network device not supporting MBS, the terminal device can receive MBS data from the access network device through the DRB.
  • the access network device can send MBS data to the terminal device through multicast broadcasting, and if the access network device does not support MBS, the access network device can use a single Send MBS data to the terminal device in broadcast mode.
  • a terminal device also called UE, mobile station (mobile station, MS), mobile terminal (mobile terminal, MT), etc.
  • the terminal device can be a handheld terminal, a customer premise equipment (CPE) notebook computer, a subscriber unit, a cellular phone, a smart phone, a wireless data card, a personal digital assistant (personal digital assistant (PDA) computer, tablet computer, wireless modem (modem), handheld device (handheld), laptop computer (laptop computer), session initiation protocol (SIP) phone, cordless phone Or wireless local loop (wireless local loop, WLL) station, machine type communication (machine type communication, MTC) terminal, wearable device (such as smart watch, smart bracelet, pedometer, etc.), vehicle equipment (such as car, Bicycles, electric vehicles, airplanes, ships, trains, high-speed rail, etc.), virtual reality (virtual reality, VR) equipment, augmented reality (augmented reality, AR) equipment, wireless terminals in industrial control (industrial control), smart home equipment (
  • CPE customer premise equipment
  • PDA personal digital
  • Access network equipment provides wireless access equipment for terminal equipment, and is mainly responsible for wireless resource management, QoS flow management, data compression and encryption on the air interface side.
  • Access network equipment may include base stations in various forms, for example: macro base stations, micro base stations (also called small stations), relay stations, access points, and so on.
  • the access network device may also include a wireless internet access (wireless fidelity, WiFi) access point (access point, AP).
  • the access network device may also include a worldwide interoperability for microwave access (WiMax) base station (base station, BS).
  • WiMax worldwide interoperability for microwave access
  • the core network device may be a core network (core network, CN) device corresponding to different devices in different systems.
  • core network core network, CN
  • SGSN serving GPRS support node
  • GGSN gateway GPRS support node
  • MME mobility management entity
  • serving gateway serving gateway
  • SGW serving gateway
  • PDN gateway public data network gateway
  • PGW policy and charging rules function
  • PCRF policy and charging rules function
  • access and mobility management function access and mobility management function
  • AMF access and mobility management function
  • SMF session management function
  • UPF user plane function
  • PCF policy control function
  • UDM unified data management
  • the data server is used to provide MBS data.
  • network architecture shown in Figure 1 is not limited to include only the terminal equipment, access network equipment, and core network equipment shown in the figure, but may also include other terminal equipment, access network equipment not shown in the figure equipment or core network equipment, the specific application will not list them one by one here.
  • the MBS service is a service for multiple UEs, and may include a broadcast service and a multicast/multicast service.
  • MBS may include live broadcast services, public safety services, and batch software update services.
  • FIG. 2 is a schematic diagram of MBS data transmission disclosed in an embodiment of the present application.
  • the MBS data comes from the data server.
  • the data server can send the MBS data to the core network device.
  • the core network device can send the MBS data to the access network device.
  • the access network device may send the MBS data to one or more UEs that receive the MBS data.
  • MBS data can be transmitted between the data server and the core network device through a common transmission channel (MBS service).
  • MBS can be transmitted between the core network device and the access network device through a common transmission channel MBS session (MBS session), and each MBS session includes at least one MBS quality of service (quality of service, QoS) flow (flow).
  • QoS quality of service
  • MBS data is sent from the access network device to the UE, the data packets in the MBS data can be transmitted through the MRB.
  • MRB has two transmission modes, one transmission mode is point to multi-point (point to multi-point, PTM) transmission, and the other transmission mode is point to point (point to point, PTP) transmission.
  • PTM point to multi-point
  • PTP point to point
  • the PTM transmission is for the access network equipment to transmit the MBS data to multiple UEs
  • PTP transmission is for the access network equipment to transmit the MBS data to one UE.
  • the user plane protocol stack may include a radio resource control (radio resource control, RRC) layer, a service data adaptation protocol (service data adaptation protocol, SDAP) layer, a packet data convergence protocol (packet data convergence protocol, PDCP) layer, a radio Link control (radio link control, RLC) layer, media access control (media access control, MAC) layer and physical (physical, PHY) layer, etc.
  • RRC radio resource control
  • SDAP service data adaptation protocol
  • PDCP packet data convergence protocol
  • RLC radio Link control
  • media access control media access control
  • MAC media access control
  • physical layer physical layer
  • the physical layer is located at the lowest layer (ie layer 1)
  • the MAC layer, RLC layer, PDCP layer and SDAP layer belong to the second layer (ie layer 2)
  • the RRC layer belongs to the third layer (ie layer 3).
  • FIG. 3 is a schematic diagram of a user plane protocol stack structure for MBS transmission disclosed in an embodiment of the present application.
  • the PHY is located at the bottom layer
  • the MAC layer is located above the PHY layer
  • the RLC layer is located above the MAC layer
  • the PDCP layer is located above the RLC layer.
  • MBS services are usually services sent by access network equipment to terminal equipment. Therefore, when transmitting MBS data, the transmission process of MBS data is as follows:
  • the MBS data first arrives at the PDCP layer of the access network device, and after being processed by the PDCP layer of the access network device, it is transmitted to the RLC layer and MAC layer of the access network device. Send it out and transmit it to the UE through the air interface.
  • Each protocol layer of the UE performs corresponding processing on the MBS data sequentially according to the reverse processing sequence of the access network equipment.
  • the processing of MBS data by each layer can be combined to be called a radio bearer.
  • a radio bearer For each data in the radio bearer, it needs to be processed by each layer, and each layer has a corresponding Functional entities to perform corresponding functions. For example, a PDCP entity at the PDCP layer.
  • Each radio bearer configuration may include a PDCP entity, and the radio bearer configuration may be associated with one or more RLC entities, and each RLC entity may correspond to a logical channel (logic channel, LCH).
  • LCH logic channel
  • the intensity of signals received by the terminal equipment from various cells will constantly change. For example, when the terminal device is moving away from the currently accessed cell (denoted as cell A), the strength of the signal received by the terminal device from cell A will continue to decrease. When the signal strength received by the terminal device from cell A drops to a certain value, the terminal device continues to transmit services on cell A, which will cause service freezes, congestion, or even dropouts.
  • the terminal equipment determines that the signal strength of the neighboring cell of cell A (denoted as cell B) is greater than the signal strength of cell A, the terminal equipment can report to the access network The device reports the event (that is, the signal strength of cell B is greater than the signal strength of cell A) to trigger the access network device to initiate a cell handover process, and handover the terminal device from cell A to cell B.
  • the event that is, the signal strength of cell B is greater than the signal strength of cell A
  • the terminal device can always keep transmitting services on the cell with stronger signal strength, thereby ensuring the service transmission quality of the terminal device.
  • FIG. 4 is a schematic flowchart of a cell measurement and handover method disclosed in an embodiment of the present application. As shown in Fig. 4, the method may include the following steps.
  • the terminal device accesses the first access network device.
  • the terminal device accessing the access network device may be realized as follows: the terminal device resides in the cell A and enters a connected state.
  • the first access network device may be the aforementioned cell A.
  • the first access network device sends the measurement configuration parameter to the terminal device.
  • the terminal device receives the measurement configuration parameter from the first access network device.
  • the measurement configuration parameters may be carried in an RRC reconfiguration (RRCReconfiguration) message sent by the first access network device to the terminal device. That is to say, the first access network device may send an RRC reconfiguration message to the terminal device, and the RRC reconfiguration message may include a measurement configuration parameter (MeasConfig).
  • RRCReconfiguration RRC reconfiguration
  • MeasConfig measurement configuration parameter
  • the measurement configuration parameters may include one or more of information such as measurement frequency point/cell information, reporting threshold configuration, filtering parameter configuration, and timer duration configuration.
  • the measurement frequency point/cell information is used to indicate the cell to be measured and the frequency point corresponding to the cell to be measured.
  • the measurement frequency point/cell information may include information about a cell currently accessed by the terminal device. Alternatively, the measurement frequency point/cell information may only include frequency point information that needs to be measured. At this time, the information of the currently accessed cell may be indicated through an RRC reconfiguration message.
  • the report threshold configuration is used to indicate the condition for the terminal device to send the measurement report to the first access network device. That is to say, the reporting threshold configuration is used to instruct the terminal device to determine the measurement report according to the measurement result and to send the measurement report to the first access network device.
  • the filter coefficient configuration is used to instruct to filter the cell signal strength currently measured by the terminal device and the measurement result of the cell determined by the terminal device in the previous cell measurement to determine the measurement result of the cell.
  • the terminal device measures the signal strength of the frequency point or the cell according to the measurement configuration parameters, and determines the measurement result.
  • the measurement configuration parameter indicates that cells to be measured include cell A and cell B.
  • the terminal device can start the PHY layer to measure the signal strength of cell A according to the measurement frequency point/cell information in the measurement configuration parameters, and then the PHY layer of the terminal device can send the signal strength of cell A to the RRC layer of the terminal device. After that, the RRC layer of the terminal device can determine the measurement result of the cell A according to the signal strength of the cell A, the previous measurement result of the cell A, and the filter coefficient.
  • the terminal device can start the PHY layer to measure the signal strength of cell B according to the measurement frequency point/cell information in the measurement configuration parameters, and then the PHY layer of the terminal device can send the signal strength of cell B to the RRC layer of the terminal device. After that, the RRC layer of the terminal device can determine the measurement result of the cell B according to the signal strength of the cell B, the previous measurement result of the cell B, and the filter coefficient.
  • the terminal device determines a measurement report according to the measurement result.
  • the RRC layer of the terminal equipment determines the measurement results of each cell.
  • the RRC layer of the terminal device can evaluate the measurement results of each cell, and determine whether the current measurement results meet one of the measurement events that need to be reported. If so, the RRC layer of the terminal device can generate a corresponding measurement report, and can send to The first access network device sends the measurement report.
  • Measurement reports may be used to report measurement events to access network devices.
  • the terminal device sends a measurement report to the first access network device.
  • the first access network device receives the measurement report from the terminal device.
  • the first access network device determines the second access network device according to the measurement report, and sends a handover request (Handover Request) to the second access network device.
  • a handover request Handover Request
  • the second access network device receives the handover request from the first access network device.
  • the second access network device is the access network device to which the terminal device needs to switch, that is, the target access network device.
  • the first access network device is also referred to as the source access network device, which corresponds to the cell A described in step 3 above.
  • the second access network device is also called the target access network device, and corresponds to the cell B described in step 403 above.
  • the second access network device sends handover request acknowledgment information (Handover Request ACK) to the first access network device.
  • Handover Request ACK handover request acknowledgment information
  • the first access network device receives handover request confirmation information from the second access network device.
  • the second access network device may determine its own device connection number, allocation of time-frequency resources, load, and the like. In a case where the second access network device determines that the terminal device can be allowed to access, the second access network device may send handover request confirmation information to the first access network device.
  • the handover request confirmation information may include one or more of a cell radio network temporary identifier (C-RNTI), a security algorithm of the second access network device, and the like.
  • C-RNTI cell radio network temporary identifier
  • the first access network device sends an RRC reconfiguration message to the terminal device.
  • the terminal device receives the RRC reconfiguration message from the first access network device.
  • the RRC reconfiguration message may include handover request confirmation information sent by the second access network device to the first access network device. That is to say, in step 408, the first access network device may send the handover request confirmation information sent by the second access network device to the first access network device to the terminal device in a transparent transmission manner.
  • the RRC reconfiguration message may include information about the second access network device, information about the terminal device accessing the One or more of the configuration parameters required by the access network equipment, etc.
  • the RRC reconfiguration message may include the physical cell identifier (physical cell identifier, PCI) of the cell B, the frequency information of the cell B (such as the frequency point of the cell B, or other frequency information), and the C cell allocated by the cell B to the terminal equipment.
  • PCI physical cell identifier
  • the frequency information of the cell B such as the frequency point of the cell B, or other frequency information
  • the C cell allocated by the cell B to the terminal equipment - one or more items of RNTI, random access channel (random access channel, RACH) resource information (such as dedicated RACH resources and/or common RACH resources) required to access cell B, etc.
  • RACH random access channel
  • the terminal device initiates random access to the second access network device.
  • the terminal device when the terminal device initiates random access to the second access network device, the terminal device first needs to disconnect from the first access network device. Before the terminal device successfully accesses the second access network device, the transmission of data transmitted by the terminal device will be temporarily interrupted.
  • the terminal device After the random access succeeds, the terminal device sends RRC reconfiguration completion information to the second access network device.
  • the terminal device can complete cell measurement and cell handover.
  • the first access network device supports the multicast-broadcast transmission mode, but the second access network device does not support the multicast-broadcast transmission mode.
  • the terminal device if MBS data is being transmitted between the terminal device and the first access network device, after the terminal device switches to the second access network device, since the second access network device does not support MBS, the terminal The device cannot continue to receive MBS data from the second access network device through the MRB, which will fail to ensure the continuity of the MBS service, thus reducing the reliability of the MBS.
  • the present application provides a communication method, which is used to ensure the MBS when the terminal device switches from the first access network device supporting MBS to the second access network device not supporting MBS. reliability.
  • the method includes: after the first access network device receives the measurement report of the terminal device, the first access network device determines whether the second access network device supports MBS, and if the second access network device does not support MBS , the first access network device indicates the first DRB and the first stop data packet. Correspondingly, the terminal device submits the data transmitted through the first DRB when it is determined according to the first stop data packet that the first condition is met.
  • the MBS data is transmitted between the terminal device and the first access network device in the form of unicast
  • the first access network device and the second access network device directly switch the MBS data being transmitted to the second access network device according to the current switching method of the terminal device receiving the unicast service, which solves the problem caused by the fact that the second access network device does not support MBS.
  • the problem of low reliability of the MBS is the reason that the MBS data is transmitted between the terminal device and the first access network device in the form of unicast.
  • FIG. 5 is a schematic flowchart of a communication method disclosed in an embodiment of the present application. As shown in Fig. 5, the communication method may include the following steps.
  • the first access network device sends the first data to the first terminal device through the first MRB.
  • the first terminal device receives the first data from the first access network device through the first MRB.
  • the first access network device When the first access network device supports MBS and the first terminal device accesses the first access network device, if there is an MBS service transmitted to the first terminal device, the first access network device may be the first The terminal device configures the first MRB, the first terminal device establishes the first MRB, and then may send the first data to the first terminal device through the first MRB.
  • the first data is MBS data, that is, data of an MBS service.
  • the first data is part of the data in the MBS data.
  • the first access network device supporting MBS may be understood as the first access network device supporting the MBS service.
  • the first access network device sends the first indication information to the first terminal device.
  • the first terminal device receives the first indication information from the first access network device.
  • the first access network device may also establish a DRB with the first terminal device. Therefore, when the first access network device needs to establish the first DRB with the first terminal device, the first access network device may send first indication information to the first terminal device, and the first indication information is used to indicate that the first DRB.
  • the first indication information indicates the first DRB, which can be understood as indicating the establishment of the first DRB.
  • the first terminal device may establish the first DRB according to the first indication information.
  • the first indication information may indicate information of the first DRB.
  • the information of the first DRB may include one or more of an identifier of the first DRB, PDCP configuration information of the first DRB, RLC configuration information of the first DRB, security configuration information of the first DRB, and the like.
  • the first DRB may follow the PDCP configuration information and/or PTP RLC configuration information of the first MRB.
  • the first DRB may follow the transmission status and transmission parameters of the transmission window corresponding to the first MRB.
  • the transmission status and transmission parameters of the transmission window may include: the data packet with the largest sequence number (sequence number, SN) currently sent, the data packet sent successfully, the data packet not sent successfully, the size of the transmission window, and the time of the relevant timer of the transmission window One or more of running status, etc.
  • the manner in which the first access network device sends the first indication information to the first terminal device will be described below.
  • the first access network device may send the first indication information to the first terminal device through configuration information.
  • the first access network device may send first configuration information to the first terminal device, and the first configuration information may include first indication information.
  • the first configuration information is configuration information used to configure the first DRB.
  • the first access network device may send the first indication information to the first terminal device through signaling.
  • the first access network device may send the first indication information to the first terminal device through high layer signaling or other signaling.
  • the first access network device may send the first indication information to the first terminal device through a message.
  • the first access network device may send the first indication information to the first terminal device through an RRC message.
  • the above is an exemplary description of the manner in which the first access network device sends the first indication information to the first terminal device, and does not limit the manner in which the first access network device sends the first indication information.
  • the first indication information may be configured by the first access network device to the first terminal device together with the first MRB used in step 501, that is, the above-mentioned first DRB may be the same as the first MRB used in step 501.
  • the MRBs are configured together for the first terminal device.
  • the first indication information may be configured to the first terminal device after the first access network device configures the first MRB used in step 501, that is, the above-mentioned first DRB may be used in step 501 configured after the first MRB.
  • the first indication information may be configured after the first access network device configures the first MRB used in step 501, and the first terminal device needs to be handed over from the first access network device to the second MRB. Configured in the case of access network devices.
  • the first access network device Before the first access network device sends the first indication information to the first terminal device, it may receive a measurement report from the first terminal device, and the measurement report is used to trigger the first access network device to switch the terminal device to the second access network equipment.
  • the first indication information may be that after the first access network device configures the first MRB used in step 501, the first terminal device needs to switch from the first access network device to the second access network device. It is configured when the network access device and the second access network device do not support MBS.
  • the first access network device Before the first access network device sends the first indication information to the first terminal device, it may receive a measurement report from the first terminal device, and the measurement report is used to trigger the first access network device to switch the terminal device to the second
  • the access network device the second access network device is an access network device that does not support MBS.
  • the first terminal device is switched from the first access network device to the second access network device
  • the first access network device is the source access network device
  • the second access network device is the target access network device. network equipment.
  • the first access network device may determine whether the second access network device supports MBS through the following three situations.
  • the first access network device may determine whether the second access network device supports MBS according to signaling interaction between the first access network device and the second access network device.
  • the first access network device may send request information to the second access network device.
  • the request information is used to request to inquire whether the second access network device supports MBS.
  • the second access network device may send response information to the first access network device after receiving the request information from the first access network device.
  • the response information is used to indicate whether the second access network device supports MBS.
  • the first access network device receives the response information from the second access network device, and then may determine whether the second access network device supports MBS according to the response information.
  • one bit in the response information is used to indicate whether the second access network device supports MBS.
  • the response information is used to indicate that the second access network device does not support MBS; when the value of the bit is "1", the response information is used to indicate that the second access network device does not support MBS; Access network equipment supports MBS.
  • the response information when the value of the bit is "1", the response information is used to indicate that the second access network device does not support MBS; when the value of the bit is "0", the response information is used to indicate that the second access network device does not support MBS; 2.
  • the access network equipment supports MBS.
  • the first access network device can determine whether the second access network device supports MBS according to the value of the bit in the response information.
  • the first access network device may determine whether the second access network device supports MBS through configuration of an operation administration and maintenance (OAM) system.
  • OAM operation administration and maintenance
  • the OAM system may send configuration information to the first access network device.
  • the configuration information may include which access network devices support MBS and which do not support MBS.
  • the configuration information may include access network devices supporting MBS.
  • the configuration information may include access network devices that do not support MBS.
  • the first access network device may determine whether the second access network device supports MBS according to the configuration information sent by the OMA system.
  • the first access network device may make the judgment according to the historical handover record of the terminal device between the first access network device and the second access network device.
  • the first access network device does not know whether the second access network device supports MBS at the beginning, but a terminal device switches from the first access network device to the second access network device before, during the switching process or Whether the second access network device supports MBS is known only after the handover, and the first access network device may store the handover record. Later, when the terminal device switches from the first access network device to the second access network device, the first access network device can determine whether the second access network device supports MBS according to the stored switching record.
  • the first access network device sends the second indication information to the first terminal device.
  • the first terminal device receives the second indication information from the first access network device.
  • the first access network device may send the second indication information to the first terminal device.
  • the second indication information is used to indicate the first stop data packet, and the first stop data packet is sent through the first MRB, that is, transmitted through the first MRB.
  • the first stop data packet may be the last data packet of the data sent through the first MRB. In the case that the data transmitted through the first MRB is the first data, the first stop packet is the last data packet in the first data.
  • the second indication information may indicate the first stop data packet by indicating the packet number of the first stop data packet.
  • the packet number of the first stop data packet may be the PDCP service data unit (service data unit, SDU) sequence number (sequence number, SN) of the first stop data packet, or the PDCP PDU SN of the first stop data packet, or It may be a packet radio service (general packet radio service, GPRS) tunneling protocol-user plane (GPRS tunneling protocol-U, GTP-U) SN.
  • GPRS general packet radio service
  • the first stop data packet may be a PDCP data packet including an end marker sent through the first MRB, that is, a PDCP data packet including only an end marker.
  • the second indication information may indicate the first stop data packet by indicating the packet number of the PDCP data packet.
  • the packet number of the first stop packet can be the PDCP SDU SN of the PDCP packet, or the PDCP PDU SN of this packet.
  • the manner in which the first access network device sends the second indication information to the first terminal device will be described below.
  • the second indication information may be sent to the first terminal device through configuration information together with the first indication information.
  • the configuration information is configuration information used to configure the first DRB.
  • the second indication information may be the PDCP PDU SN corresponding to the first stop data packet.
  • the first access network device may send the second indication information to the first terminal device through high-layer signaling or other signaling.
  • the signaling can be an RRC message, such as an RRC connection release message, or a PDCP control PDU, or an RLC control PDU, or a MAC control element (MAC control element, MAC CE), or other signaling.
  • the first access network device may carry the second indication information in a header of the data packet and send it to the first terminal device.
  • the second indication information may be sent by the first access network device to the first terminal device when the first terminal device needs to be handed over from the first access network device to the second access network device.
  • the second indication information may be that the first terminal device needs to be handed over from the first access network device to the second access network device, and the second access network device does not support MBS, the first sent by the access network device to the first terminal device.
  • the first access network device may send the second indication information to the first terminal device multiple times.
  • the first stop data packets indicated by the second indication information for multiple times may be the same or different.
  • the first stop data packet may include one or more data packets.
  • step 502 and step 503 may be executed in series, step 502 may be executed first and then step 503 may be executed, or step 503 may be executed first and then step 502 executed.
  • Step 502 and step 503 can also be executed in parallel.
  • the first access network device may send the first indication information and the second indication information to the first terminal device respectively through two messages or signaling, or may send the first indication information to the first terminal device through one message or signaling.
  • the indication information and the second indication information that is, the first indication information and the second indication information may be sent through the same message or signaling.
  • the first terminal device submits the second data received through the first DRB.
  • the first terminal device After the first terminal device receives the second indication information from the first access network device, it may determine or judge whether the first condition is met according to the second indication information, and if it is determined according to the second indication information that the first condition is met, The second data received through the first DRB may be delivered. If it is determined according to the second indication information that the first condition is not satisfied, the second data received through the first DRB may not be submitted.
  • the first data and the second data belong to the same MBS service, that is, the first data and the second data are data of the same MBS service.
  • the first condition may be that the stop data packet in the data received through the MRB and/or the delivery of the data packet before the stop data packet is completed. Therefore, it may be determined that the first condition is met in a case where delivery of the first stop data packet and/or data packets preceding the first stop data packet among the data received through the first MRB is completed.
  • the first condition can be understood as the first condition can be the completion of the delivery of the stop data packet in the data received through the MRB, or it can be understood that the first condition is the completion of the delivery of the data packet before the stop data packet in the data received through the MRB, and it can also be understood The submission of the stop data packet and the data packet before the stop data packet among the data received through the MRB is completed.
  • the delivery of the stop data packet in the data received through the MRB is completed, which can be understood as the stop data packet in the data received through the MRB and before the stop data packet
  • the packet submission is complete.
  • the delivery of the stop data packet in the data received through the MRB is completed, which can be understood as the stop data packet included in the data received through the MRB and the stop data packet
  • the delivery of other data packets except the lost data packets in the previous data packets is completed.
  • the delivery of the stop data packet in the data received through the MRB is completed, which can be understood as the stop data packet in the data received through the MRB and part or all of the previous stop data packet Packet delivery is complete.
  • the delivery of the data packets before the stop data packet is completed, which may be understood as the delivery of the data packets other than the lost data packet and the stop data packet in the data received through the MRB is completed. It should be understood that, in the case of no packet loss, it can be understood that all data packets except the stop data packet in the data received through the MRB have been delivered.
  • the first stop data packet is the last data packet in the data received (or transmitted) through the first MRB
  • the first stop data packet and the first stop data packet in the data received through the first MRB The completion of the delivery of the data packet before the stop data packet can be understood as the completion of the delivery of the data received by the first MRB; In the received data, all data packets except the first stop data packet are delivered.
  • the first stop data packet is a PDCP data packet including an end mark
  • Completion may be understood as completion of submission of data received through the first MRB.
  • the completion of data packet delivery can be understood as the data packet is delivered from the PDCP layer to a higher layer.
  • the above submission can be understood as submission from the PDCP layer to a higher layer.
  • the first condition may be that the packet number of the first uncommitted data packet in the receiving window corresponding to the MRB is greater than or equal to the packet number of the stop data packet received through the MRB. Therefore, in a case where the packet number of the first uncommitted data packet in the receiving window corresponding to the first MRB is greater than or equal to the packet number of the first stop data packet, it may be determined that the first condition is met.
  • the packet number of the first undelivered data packet in the receive window can be indicated or defined by the "RX_DELIV" state variable of the PDCP receive window.
  • the packet number of the first uncommitted data packet in the receiving window corresponding to the MRB is greater than or equal to the packet number of the stop data packet received through the MRB, which can be understood as the stop in the data received through the MRB
  • the packet number of the first undelivered data packet in the receiving window corresponding to the MRB is equal to the packet number of the stop data packet received through the MRB, which can be understood as being received through the MRB
  • the data in the stop packet before the packet delivery is complete.
  • the packet number of the first undelivered data packet in the receiving window corresponding to the MRB is greater than or equal to the packet number of the stop data packet received through the MRB, which can be understood as due to hybrid automatic retransmission Request (hybrid automatic retransmission request, HARQ) retransmission or RLC retransmission or PDCP retransmission has been unsuccessful.
  • hybrid automatic retransmission Request hybrid automatic retransmission request, HARQ
  • the PDCP receiving window corresponding to the MRB will skip the lost data packets in the MRB data, and send the first unsuccessful
  • the packet number of the submitted data packet is set to be greater than or equal to the packet number of the lost data packet, and the packet number of the first uncommitted data packet in the PDCP receiving window corresponding to the MRB is greater than or equal to the packet number of the stop data packet.
  • the same MRB service and the data transmitted through the same MRB can be received through one receiving window, and when the first access network device sends data to the first terminal device, the packet number of the data packet is incremented according to the sending order, That is, the packet number of the data packet sent earlier is smaller than the packet number of the data packet sent later.
  • the first terminal device After the first terminal device receives the data packet through the receiving window corresponding to the first MRB, it may submit the received data packet, and after the data packet delivery is completed, it may delete the data packet in the receiving window.
  • the corresponding data packets in the receiving window are data packets received but not yet delivered or data packets that are about to be received but not yet delivered.
  • the first condition may be that the MRB is released (or deleted). Therefore, in the case that the first MRB is released, it can be determined that the first condition is met.
  • the MRB is released, which can be understood as the completion of the release of the MRB, or the start of the release of the MRB.
  • the MRB is deleted, which can be understood as the completion of the deletion of the MRB, or it can be understood as the start of the deletion of the MRB.
  • the first terminal device may release the first MRB, and it may be determined that Satisfy the first condition.
  • the first terminal device may release the first MRB , it can be determined that the first condition is satisfied.
  • the delivery of data packets after the data packet may be stopped, and an indication message is sent to the first access network device to indicate the loss of the data packet, Or after the packet is lost and delivery has stopped.
  • the indication information may be a PDCP status report.
  • the first terminal device may report the packet number of the lost data packet to the first access network device, which may be a PDCP SDU SN, a GTP-U SN, or a PDCP PDU SN. In another implementation manner, the first terminal device may report the packet number of the data packet to be delivered to the first access network device.
  • the data packet number is the next packet number of the lost data packet , which can be PDCP SDU SN, GTP-U SN, or PDCP PDU SN.
  • the first terminal device may report the packet number of the data packet that has been delivered to the upper layer to the first access network device. It can be understood that this data packet number is the previous packet number of the lost data packet. Packet number, which can be PDCP SDU SN, GTP-U SN, or PDCP PDU SN.
  • the first access network device may send the undelivered first data in the data packet received through the first MRB to the first terminal device through the first DRB or through the DRB.
  • the MRB if the first condition is met, the MRB can be released.
  • the DRB here may be the first DRB, or the DRB configured by the second access network device for the first terminal device, or the first DRB, and the DRB configured by the second access network device for the first terminal device .
  • the first access network device may send the second data to the first terminal device through the first DRB.
  • the first terminal device may receive the second data from the first access network device through the first DRB.
  • the second data packet may include data received through the first MRB but not delivered yet.
  • the first access network device may send third data to the first terminal device, where the third data includes the first data received through the first MRB but not delivered yet.
  • the second data may be actively sent by the first access network device to the first terminal device, or the first terminal device may first send indication information to the first access network device for instructing to send data through the first DRB. After receiving the indication information, an access network device may send the second data to the first terminal device according to the indication information.
  • the indication information may also be used to indicate undelivered data packets in the MBS data received through the first MRB, for example, the indication information may include the packet numbers of the lost data packets.
  • the transmitted data is also independent. Therefore, in order for the first terminal device to determine that the first data and the second data belong to the same MBS service, the first access network device may indicate to the first terminal device the correspondence between the first MRB and the first DRB, so that the first The terminal device can determine the corresponding relationship between the first MRB and the first DRB by using the indication information, and then can determine that the first data and the second data belong to the same MBS service according to the corresponding relationship between the first MRB and the first DRB.
  • the first access network device may indicate to the first terminal device the correspondence between the first MRB and the first DRB by using indication information. Specifically, the first access network device may send third indication information to the first terminal device, where the third indication information is used to indicate the correspondence between the first MRB and the first DRB. Correspondingly, the first terminal device receives third indication information from the first access network device. Afterwards, when it is determined according to the second indication information that the first condition is satisfied, the first terminal device may submit the second data received through the first DRB according to the correspondence between the first MRB and the first DRB.
  • the third indication information may be sent through special signaling, and the third indication information may be the information of the first MRB and the information of the first DRB.
  • the information of the first DRB may be an identifier of the first DRB, or may be other information that can uniquely identify the above-mentioned DRB.
  • the third indication information may also be sent through configuration information.
  • the configuration information is used to configure the first MRB.
  • the configuration information for updating the configuration of the first MRB may carry or include the information of the first DRB to indicate the correspondence between the first MRB and the first DRB, such as the identifier of the first DRB.
  • the third indication information may also be sent through a data packet.
  • the information of the first DRB such as the identifier of the first DRB, may be included or carried in one or more data packets corresponding to the data received through the first MRB, so as to indicate the correspondence between the first MRB and the first DRB.
  • the one or more data packets may be PDCP data packets, RLC data packets, or MAC CE data packets.
  • the first access network device may also multiplex the above indication information to indicate to the first terminal device the correspondence between the first MRB and the first DRB.
  • the first indication information may also be used to indicate the correspondence between the first MRB and the first DRB. It may be that the information of the first MRB is added to the first indication information, such as the identifier of the first MRB.
  • the third indication information may be sent in the same message as the first indication information and the second indication information, or may be the same indication information as the first indication information and/or the second indication information.
  • the first terminal device may first send fourth indication information to the first access network device, where the fourth indication information is used to indicate that the first condition is met.
  • the first access network device may indicate that the delivery of the first data is completed or that the delivery of the data packets before the first stop data packet in the first data is completed, or that the release of the MRB is completed.
  • the second data may be sent to the first terminal device through the first DRB. After receiving the second data from the first access network device through the first DRB, the first terminal device may directly submit the second data without waiting.
  • the fourth indication information may also be used to indicate the first MRB and the packet number of the data packet.
  • the fourth indication information may include or carry the identifier of the first MRB.
  • the packet number of the data packet may include the packet number of the last data packet in the data received through the first MRB, or the packet number of the data packet with the largest packet number among the data packets that have been submitted in the data received through the first MRB, or through The packet number of the data packet with the smallest packet number of the uncommitted data packet among the data received by the first MRB.
  • the packet number of the data packet may also include the packet number of the lost data packet.
  • the packet number of the data packet is the data packet with the largest packet number among the submitted data packets or the smallest packet number among the submitted data packets data pack.
  • the first terminal device may submit the second data received through the DRB after satisfying the first condition.
  • the protocol in order to ensure the minimum loss switching of MBS, the protocol can stipulate that: when the terminal equipment is handed over from the source access network equipment supporting MBS to the target access network equipment not supporting MBS, the terminal equipment can satisfy In the case of the first condition, the data received through the DRB is submitted.
  • the first terminal device may determine whether the first condition is met according to the second indication information.
  • the first indication information may include or carry information about the first MRB, and may implicitly indicate that the first MRB is to be released. Therefore, after receiving the first indication information and the second indication information, the The second indication information determines whether the first condition is met.
  • the second indication information when the second indication information is transmitted through an MRB release message, the second indication information may also be used to indicate the release of the first MRB. Therefore, after receiving the first indication information and the second indication information , it may be determined according to the second indication information whether the first condition is met.
  • the access network device can configure configuration information for the terminal device, and the configuration information can be used to indicate: when the terminal device switches from the source access network device supporting MBS to a non-MBS
  • the terminal device may submit the data received through the DRB when the first condition is met.
  • the first access network device determines that the first terminal device is switched from the first access network device supporting MBS to the second access network device not supporting MBS, it may send the fifth indication to the first terminal device information, the fifth indication information is used to indicate that the data transmitted through the first DRB is delivered after the first condition is satisfied.
  • the first terminal device receives the fifth indication information from the first access network device, and then may determine whether the first condition is met according to the fifth indication information and the second indication information, and if it is determined that the first condition is met, The second data received through the first DRB may be delivered.
  • One or both of the fifth indication information and the first indication information or the second indication information may be the same message or the same indication information. It should be understood that the fifth indication information and the first indication information are the same message, and the second indication information is another message. Or the first indication information, the second indication information and the fifth indication information are the same message. Not as a limitation.
  • the first terminal device may perform a unicast handover process to the second access network device.
  • the first access network device can forward data to the second access network device, the data has been sent by the core network device to the first access network device, but the first access network device has not passed Data sent by the first MRB and/or the first DRB to the first terminal device, or data not submitted to a higher layer by the first terminal device.
  • the first access network device may send indication information to the core network device, which is used to indicate the packet number information of the data packet forwarded by the first access network device to the second core network device.
  • a specific implementation manner may be to indicate the first packet number of the forwarded data packet and/or the last data packet number of the forwarded data packet.
  • the specific data packet number can be GTP-US SN.
  • FIG. 6 is a schematic diagram of a terminal device switching from a first access network device to a second access network device disclosed in an embodiment of the present application.
  • the MBS data sent by the core network device to the first access network device includes 7 GTP-U data packets, and the packet numbers of the 7 GTP-U data packets are 1-7.
  • the first access network device sends the GTP-U data packets with packet numbers 1-3 to the terminal device through the MRB.
  • the GTP-U data packet with the packet number 3 (that is, the PDCP PDU data packet with the packet number 81) is when the terminal device needs to switch from the first access network device to the second access network device, and the second access network device When the network device does not support MBS, the stop packet is sent.
  • the PDCP entity corresponding to the MRB processes the above-mentioned GTP-U data packets with packet numbers 1 to 3 respectively, and the packet numbers of the PDCP PDU data packets obtained are 79-81 respectively.
  • the first access network device can be configured with a DRB, and can send GTP-U data packets with a packet number of 4-5 to the terminal device through this DRB, and the PDCP PDU data packets obtained after the PDCP entities of the DRB are respectively processed are respectively 0 and 1.
  • the terminal device After the terminal device receives the data packets with the PDCP PDU packet numbers 0 and 1, it may not submit the data to the higher layer first, and the terminal device will submit the GTP-U data packets with the packet numbers 1-3 received through the MRB by the PDCP layer.
  • the terminal device can start to submit the data packet transmitted through the DRB to a higher layer. For example, the GTP-U data packet with the packet number 4-5 is submitted, but the first access network device does not send the GTP-U data packet with the packet number 6-7 to the terminal device.
  • the first access network device can send the GTP-U data packet with the packet number 6-7 to the second access network device, and the terminal device is switched from the first access network device to the second After accessing the network device, the second access network device can send the GTP-U data packet with the packet number 6-7 to the first terminal device through the DRB, so as to realize data switching with minimum loss.
  • the first access network device can also report to the core network device that the first access network device forwards data to the second access network device, for example, the forwarded GTP-U data packet number is 6-7, so that the core network
  • the device may know from which data packet to start sending data to the second access network device, for example, a GTP-U data packet with a packet number of 8.
  • the second access network device can send data more flexibly, without being restricted by the configuration or progress of the first access network device sending data to the first terminal device.
  • FIG. 7 is a schematic flowchart of another communication method disclosed in an embodiment of the present application. As shown in Fig. 7, the communication method may include the following steps.
  • the core network device sends MBS data to the first access network device.
  • the first access network device receives the MBS data from the core network device.
  • the core network device may initiate an MBS session (MBS session ) or an MBS flow establishment/modification request, so that a transmission channel for transmitting MBS data is established between the core network device and the first access network device. Afterwards, the core network device can send the MBS data to the first access network device through the established transmission channel.
  • MBS session MBS session
  • MBS flow establishment/modification request MBS flow establishment/modification request
  • a first MRB may be established between the first access network device and the first terminal device, so that MBS data may be transmitted between the first access network device and the first terminal device through the first MRB.
  • the first access network device sends the first data to the first terminal device through the first MRB.
  • the first terminal device receives the first data from the first access network device through the first MRB.
  • step 701 For the detailed description of step 701, reference may be made to the description of step 501.
  • the first data is part of the above MBS data.
  • the first terminal device sends a measurement report to the first access network device.
  • the first access network device receives the measurement report from the first terminal device.
  • the present application also provides a method that can trigger the first terminal device to report a measurement report in advance, so that the first terminal device A terminal device has enough time to perform cell switching.
  • the first terminal device may trigger and report a measurement report through a new measurement event.
  • the new measurement event is used to enable the first terminal device to trigger and report a measurement report in advance.
  • the new measurement event may include one or more of the following:
  • E1 The measurement result of the serving cell is higher than the threshold b 1 .
  • E2 The measurement result of the serving cell is lower than the threshold b 2 .
  • E3 The measurement result of the neighboring cell + c is higher than the measurement result of the serving cell + an offset value (offset).
  • E5 The measurement result of the serving cell is lower than the threshold b 4 , and the measurement result of the neighboring cell is higher than the threshold b 5 .
  • E6 The measurement result +d of the adjacent cell is higher than the measurement result + offset of the Scell.
  • F1 The measurement result of the cell of the different system is higher than the threshold b 6 .
  • F2 The measurement result of the cell of the different system is higher than the threshold b 7 , and the measurement result of the SPcell is lower than the threshold b8.
  • a 1 is greater than b 1
  • a 2 is less than b 2
  • a 3 is greater than b 3
  • a 4 is less than b 4
  • a 5 is greater than b 5
  • a 6 is greater than b 6
  • a 7 is greater than b 7
  • a 8 is less than b 8
  • Both c and d are greater than 0.
  • the first terminal device can trigger and report the measurement report in advance, so that the first terminal device has enough time to establish the first DRB and perform cell handover, which reduces the probability of handover failure or service failure of the first terminal device.
  • the duration of the outage is the duration of the outage.
  • the introduction of a new measurement event is optional.
  • the first terminal device can also trigger and report a measurement report based on the existing measurement event configured for handover, while the first access network device can use the existing measurement mechanism and target access Whether the network device supports MBS is used to determine whether to configure the first DRB first and then perform the handover.
  • the first access network device determines the second access network device according to the measurement report.
  • the first access network device determines whether the second access network device supports MBS, and performs the following steps after determining that the second access network device does not support MBS.
  • step 705 For the description of step 705, reference may be made to the relevant description in step 502.
  • the first access network device sends the first indication information to the first terminal device.
  • the first terminal device receives the first indication information from the first access network device.
  • step 706 reference may be made to the description of step 502.
  • the first access network device sends the second indication information to the first terminal device.
  • the first terminal device receives the second indication information from the first access network device.
  • step 707 reference may be made to the description of step 503.
  • the first access network device sends the second data to the first terminal device through the first DRB.
  • the first terminal device receives the second data from the first access network device through the first DRB.
  • step 708 reference may be made to the relevant description below step 504.
  • the first terminal device submits the second data received through the first DRB.
  • step 709 may refer to the description of step 504 .
  • step 706 and step 707 may be executed in parallel or in series.
  • step 705 may also be performed after step 706 , step 707 or step 708 and before step 709 .
  • FIG. 8 is a schematic flowchart of another communication method disclosed in an embodiment of the present application. As shown in Fig. 8, the communication method may include the following steps.
  • the core network device sends MBS data to the first access network device.
  • the first access network device receives the MBS data from the core network device.
  • step 801 For the detailed description of step 801, reference may be made to the description of step 701.
  • the first access network device sends the first data to the first terminal device through the first MRB.
  • the first terminal device receives the first data from the first access network device through the first MRB.
  • step 802 reference may be made to the description of step 501.
  • the first terminal device sends a measurement report to the first access network device.
  • the first access network device receives the measurement report from the first terminal device.
  • step 803 reference may be made to the description of step 703.
  • the first access network device determines the second access network device according to the measurement report.
  • the first access network device determines whether the second access network device supports MBS, and performs the following steps after determining that the second access network device does not support MBS.
  • step 805 reference may be made to the relevant description in step 502.
  • the first access network device sends the first indication information to the first terminal device.
  • the first terminal device receives the first indication information from the first access network device.
  • step 806 reference may be made to the description of step 502.
  • the first access network device sends the second indication information to the first terminal device.
  • the first terminal device receives the second indication information from the first access network device.
  • step 807 reference may be made to the description of step 503.
  • the first terminal device sends fourth indication information to the first access network device.
  • the first access network device receives fourth indication information from the first terminal device.
  • the first access network device sends the second data to the first terminal device through the first DRB.
  • the first terminal device receives the second data from the first access network device through the first DRB.
  • step 808-step 809 reference may be made to the relevant description below step 504.
  • the first terminal device submits the second data received through the first DRB.
  • step 810 may refer to the description of step 504 .
  • step 806 and step 807 may be executed in parallel or in series.
  • step 805 may also be performed after step 806 or step 807 and before step 808 .
  • the functions performed by the first terminal device in the above communication method may also be performed by a module (for example, a chip) in the first terminal device, and the functions performed by the first access network device in the above communication method may also be performed by A module (for example, a chip) in the first access network device is performed, and the functions performed by the second access network device in the above communication method may also be performed by a module (for example, a chip) in the second access network device .
  • FIG. 9 is a schematic structural diagram of a communication device disclosed in an embodiment of the present application.
  • the communication device may include:
  • a sending unit 901, configured to send first data to the first terminal device through the first MRB, where the first data is MBS data;
  • the sending unit 901 is further configured to send first indication information to the first terminal device, where the first indication information is used to indicate the first DRB;
  • the sending unit 901 is further configured to send second indication information to the first terminal device, where the second indication information is used to indicate the first stop data packet, and the first stop data packet is sent through the first MRB.
  • the sending unit 901 sending the first indication information to the first terminal device includes:
  • the sending unit 901 sending the second indication information to the first terminal device includes:
  • the sending unit 901 is further configured to send the second data to the first terminal device through the first DRB, the first data and the second data belong to the same MBS service, and there is a correspondence between the first MRB and the first DRB relation.
  • the sending unit 901 is further configured to send third indication information to the first terminal device, where the third indication information is used for the correspondence.
  • the communication device may also include:
  • a receiving unit 902 configured to receive fourth indication information from the first terminal device, where the fourth indication information is used to indicate that the first condition is met;
  • the sending unit 901 is further configured to send second data to the first terminal device through the first DRB, where the first data and the second data belong to the same MBS service.
  • the sending unit 901 is further configured to send fifth indication information to the first terminal device, where the fifth indication information is used to indicate that the data transmitted through the first DRB is delivered after the first condition is satisfied.
  • the first indication information is also used to indicate the corresponding relationship.
  • the first condition may be:
  • the packet number of the first uncommitted data packet in the receiving window corresponding to the MRB is greater than or equal to the packet number of the stop data packet received through the MRB;
  • FIG. 10 is a schematic structural diagram of another communication device disclosed in an embodiment of the present application.
  • the communication device may include:
  • the receiving unit 1001 is configured to receive first data from the first access network device through the first MRB, where the first data is MBS data;
  • the receiving unit 1001 is further configured to receive first indication information from the first access network device, where the first indication information is used to indicate the first DRB;
  • the receiving unit 1001 is further configured to receive second indication information from the first access network device, where the second indication information is used to indicate a first stop data packet, and the first stop data packet is received through the first MRB;
  • the submitting unit 1002 is configured to submit the second data received through the first DRB when it is determined according to the second indication information that the first condition is met, and the first data and the second data belong to the same MBS service.
  • the submitting unit 1002 is specifically configured to switch the first terminal device from the first access network device to the second access network device, the second access network device does not support MBS, and according to the second instruction information When it is determined that the first condition is met, submit the second data received through the first DRB.
  • the receiving unit 1001 is further configured to receive the second data from the first access network device through the first DRB, and there is a corresponding relationship between the first MRB and the first DRB;
  • the submitting unit 1002 submitting the second data received through the first DRB includes:
  • the receiving unit 1001 is further configured to receive third indication information from the first access network device, where the third indication information is used to indicate the corresponding relationship.
  • the submitting unit 1002 submitting the second data received through the first DRB includes:
  • the receiving unit 1001 is further configured to receive fifth indication information from the first access network device, where the fifth indication information is used to indicate that the data transmitted through the first DRB is submitted after meeting the first condition;
  • the submitting unit 1002 is specifically configured to submit the second data received through the first DRB when the first condition is determined to be met according to the second indication information according to the fifth indication information.
  • the first indication information is also used to indicate the corresponding relationship.
  • the first condition may be:
  • the packet number of the first uncommitted data packet in the receiving window corresponding to the MRB is greater than or equal to the packet number of the stop data packet received through the MRB;
  • the above units may be independent or integrated.
  • the receiving unit and the unit can be independent, or integrated into a transceiver unit.
  • the communication device may include a processor 1101 , a memory 1102 , a transceiver 1103 and a bus 1104 .
  • the memory 1102 may exist independently, and may be connected to the processor 1101 through the bus 1104 .
  • the memory 1102 can also be integrated with the processor 1101 .
  • the bus 1104 is used to realize the connection between these components.
  • the transceiver 1103 may include a transmitter 11031 , a receiver 11032 and an antenna 11033 .
  • the transceiver 1103 may include a transmitter (ie, an output interface) and a receiver (ie, an input interface).
  • a transmitter may include a transmitter and an antenna, and a receiver may include a receiver and an antenna.
  • the communication device may be the first access network device, or may be a module in the first access network device.
  • the processor 1101 is used to control the sending unit 901 and the receiving unit 902 to perform the operations performed in the above embodiments
  • the transceiver 1103 is used to execute the sending unit 901 and the receiving unit in the above embodiments Operation performed by unit 902.
  • the above-mentioned communication device may also be used to execute various methods performed by the first access network device in the above-mentioned method embodiments in FIG. 5 , FIG. 7 , and FIG. 8 , and details will not be repeated here.
  • the communication device may be the first terminal device, or may be a module in the first terminal device.
  • the processor 1101 is used to control the receiving unit 1001 to perform the operations performed in the above embodiments, and the processor 1101 is also used to perform the operations performed by the submitting unit 1002 in the above embodiments,
  • the transceiver 1103 is configured to perform the operations performed by the receiving unit 1001 in the above embodiments.
  • the above-mentioned communication device may also be used to execute various methods performed by the first terminal device in the above-mentioned method embodiments in FIG. 5 , FIG. 7 , and FIG. 8 , which will not be repeated here.
  • FIG. 12 is a schematic structural diagram of another communication device disclosed in an embodiment of the present application.
  • the communication device may include an input interface 1201 , a logic circuit 1202 and an output interface 1203 .
  • the input interface 1201 and the output interface 1203 are connected through a logic circuit 1202 .
  • the input interface 1201 is used for receiving information from other communication devices
  • the output interface 1203 is used for outputting, scheduling or sending information to other communication devices.
  • the logic circuit 1202 is configured to perform operations other than the operations of the input interface 1201 and the output interface 1203 , for example, realizing the functions implemented by the processor 1101 in the above-mentioned embodiments.
  • the communication device may be a terminal device (or a module in the terminal device), or may be an access network device (or a module in the access network device).
  • the input interface 1201, the logic circuit 1202, and the output interface 1203 can be directly obtained by directly referring to the related descriptions of the terminal device or the access network device in the above method embodiments, and will not be repeated here.
  • transmitters, receivers, and antennas can be standalone or integrated into a transceiver.
  • the input interface and the output interface may be independent, or may be integrated into a communication interface.
  • the embodiment of the present application also discloses a computer-readable storage medium, on which instructions are stored, and when the instructions are executed, the methods in the foregoing method embodiments are executed.
  • the embodiment of the present application also discloses a computer program product including computer instructions, when the computer instructions are executed, the methods in the above method embodiments are executed.
  • the embodiment of the present application also discloses a communication system, which may include a centralized controller, a routing calculator, and a routing executor.
  • a communication system which may include a centralized controller, a routing calculator, and a routing executor.
  • a routing executor for specific description, please refer to the communication method shown above.

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Abstract

本申请实施例公开一种通信方法及装置，第一接入网设备通过第一多播广播业务无线承载MRB向第一终端设备发送第一数据，向第一终端设备发送指示第一数据无线承载DRB的第一指示信息，向第一终端设备发送指示通过第一MRB发送的第一停止数据包的第二指示信息，第一终端设备在根据第二指示信息确定满足第一条件的情况下，递交通过第一DRB接收的第二数据，第一数据为多播广播业务MBS数据，第一数据和第二数据属于同一MBS业务。本发明实施例中，可以提高MBS传输的可靠性。

Description

一种通信方法及装置
本申请要求于2021年10月20日提交中国专利局、申请号为202111222152.2、申请名称为“一种通信方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请实施例涉及通信技术领域，尤其涉及一种通信方法及装置。
背景技术
多播广播业务(multicast and broadcast service，MBS)业务是面向多个用户设备(user equipment，UE)的业务。例如，MBS业务可以包括直播业务、公共安全业务、批量软件更新业务等。数据服务器可以将MBS数据发送给核心网设备，核心网设备可以将MBS数据发送给接入网设备，接入网设备可以将MBS数据发送给接收MBS数据的一个或多个UE。
UE的位置可能会随着需要发生移动，以致UE需要从一个接入网设备切换到另一个接入网设备。在UE接收MBS的情况下，如果UE从支持MBS的接入网设备切换到不支持MBS的接入网设备，如何保证MBS的可靠传输非常重要。
发明内容
本申请实施例公开了一种通信方法及装置，用于提高MBS传输的可靠性。
第一方面公开一种通信方法，该通信方法可以应用于第一接入网设备，也可以应用于第一接入网设备中的模块(例如，芯片)。下面以应用于第一接入网设备为例进行描述。该通信方法可以包括：
通过第一MBS无线承载(MBS radio bearer，MRB)向第一终端设备发送第一数据，第一数据为MBS数据；
向第一终端设备发送第一指示信息，第一指示信息用于指示第一数据无线承载(data radio bearer，DRB)；
向第一终端设备发送第二指示信息，第二指示信息用于指示第一停止数据包，第一停止数据包通过第一MRB发送。
本申请实施例中，第一接入网设备可以通过第一MRB向第一终端设备发送第一数据，可以向第一终端设备发送用于指示第一DRB的第一指示信息，以及用于指示第一停止数据包的第二指示信息，以便第一终端设备接收到第二指示信息之后，可以根据第一停止数据包判断是否满足第一条件，在判断出满足第一条件的情况下，可以递交通过第一DRB传输的第二数据，在判断出不满足第一条件的情况下，不可以递交通过第一DRB传输的第二数据，可以避免不管满不满足第一条件，在第一终端设备接收到通过第一DRB传输的第二数据之后就递交第二数据的情况下，可以保证第一终端设备通过第一MRB接收并递交的数据和通过第一DRB接收并递交的数据是连续且顺序没有混乱的，从而可以提高MBS传输的可靠性。此外，第一DRB与第一MRB的配置可以是独立的，可以避免第一DRB的配置受限于第一MRB，从而可以提高DRB配置的灵活性。
作为一种可能的实施方式，第一接入网设备向第一终端设备发送第一指示信息可以包括：
在第一终端设备由第一接入网设备切换至第二接入网设备，且第二接入网设备不支持 MBS的情况下，向第一终端设备发送第一指示信息；
第一接入网设备向第一终端设备发送第二指示信息可以包括：
在第一终端设备由第一接入网设备切换至第二接入网设备，且第二接入网设备不支持MBS的情况下，向第一终端设备发送第二指示信息。
本申请实施例中，由于第一终端设备只有在由第一接入网设备切换至第二接入网设备，且第二接入网设备不支持MBS的情况下，需要在满足第一条件的情况下递交通过DRB传输的数据，因此，第一接入网设备可以在第一终端设备由第一接入网设备切换至第二接入网设备，且第二接入网设备不支持MBS的情况下，向第一终端设备发送用于指示第一DRB的第一指示信息，以及用于指示第一停止数据包的第二指示信息，可以避免第一终端设备没有由第一接入网设备切换至第二接入网设备，第一接入网设备向第一终端设备发送第一指示信息和第二指示信息，可以减少不必要信息的传输，配置不必要的DRB，占用的无线承载资源，从而可以避免造成传输资源的浪费，从而可以节约传输资源。或者第一终端设备由第一接入网设备切换至第二接入网设备，但第二接入网设备支持MBS的情况下，第一接入网设备向第一终端设备发送第一指示信息和第二指示信息，引起切换的时延。
作为一种可能的实施方式，该通信方法还可以包括：
通过第一DRB向第一终端设备发送第二数据，第一数据和第二数据属于同一MBS业务，第一MRB与第一DRB之间存在对应关系。
本申请实施例中，第一接入网设备可以向第一终端设备通过第一DRB发送与第一数据属于同一MBS业务的第二数据，以便第一终端设备根据第二指示信息确定满足第一条件之后，可以递交通过第一DRB传输的数据。此外，由于不同MBS业务使用的MRB不同，不同单播业务使用的DRB不同，因此，第一MRB与第一DRB之间存在对应关系，以便第一终端设备在由支持MBS的第一接入网设备切换到不支持MBS的第二接入网设备，且满足第一条件的情况下，可以根据该对应关系确定哪个MRB与哪个DRB传输的数据为同一MBS业务的数据，进而可以递交通过第一DRB传输的第二数据，可以提高MBS传输的可靠性。
作为一种可能的实施方式，该通信方法还可以包括：
向第一终端设备发送第三指示信息，第三指示信息用于该对应关系。
本申请实施例中，第一接入网设备可以向第一终端设备发送第一MRB与第一DRB之间的对应关系，以便第一终端设备可以根据第三指示信息确定第一MRB与第一DRB之间的对应关系，进而在由支持MBS的第一接入网设备切换到不支持MBS的第二接入网设备，且满足第一条件的情况下，可以根据该对应关系递交通过第一DRB传输的第二数据，可以提高MBS传输的可靠性。
作为一种可能的实施方式，该通信方法还可以包括：
接收来自第一终端设备的第四指示信息，第四指示信息用于指示满足第一条件；
通过第一DRB向第一终端设备发送第二数据，第一数据和第二数据属于同一MBS业务。
本申请实施例中，第一接入网设备接收到来自第一终端设备的用于指示满足第一条件之后，可以通过第一DRB向第一终端设备发送与第一数据属于同一MBS业务的第二数据，在没有接收到该指示信息的情况下，不通过第一DRB向第一终端设备发送数据，可以保证通过第一MRB接收并递交的数据和通过第一DRB接收并递交的数据是连续且没有乱序的，从而可以提高MBS的可靠性，同时可以减少第一终端设备根据多个无线承载的状态判断动作的行为，相应的判断流程通过信令完成可以减少判断的复杂度。
作为一种可能的实施方式，该通信方法还可以包括：
向第一终端设备发送第五指示信息，第五指示信息用于指示通过第一DRB传输的数据在满足第一条件后递交。
本申请实施例中，第一接入网设备可以向第一终端设备配置通过DRB传输的数据在满足第一条件后递交，以便第一终端设备根据该配置在满足第一条件后递交通过DRB传输的数据，可以避免通过第一MRB接收并递交的数据和通过第一DRB接收并递交的数据不连续或乱序，并且可以提高MSB传输的可靠性。
作为一种可能的实施方式，第一指示信息还用于指示该对应关系。
本申请实施例中，第一MRB与第一DRB之间的对应关系可以复用第一指示信息进行指示，不需要通过专门的消息或信令进行指示，可以减少消息或信令的传输，从而可以节约传输资源。
作为一种可能的实施方式，第一条件可以为：
通过MRB接收的数据中停止数据包和/或该停止数据包之前的数据包递交完成；或者
MRB对应的接收窗中第一个未递交数据包的包号大于或等于通过该MRB接收的停止数据包的包号；或者
MRB被释放掉。
本申请实施例中，第一条件可以保证通过MRB接收的停止数据包前接收的数据递交完成，或者通过MRB接收的停止数据包以及停止数据包前接收的数据递交完成，可以避免MBS业务数据递交到高层时乱序，并且可以很大程度保证通过MRB接收的数据全部递交，从而可以提高MBS的可靠性。
第二方面公开一种通信方法，该通信方法可以应用于第一终端设备，也可以应用于第一终端设备中的模块(例如，芯片)。下面以应用于第一终端设备为例进行描述。该通信方法可以包括：
通过第一MRB接收来自第一接入网设备的第一数据，第一数据为MBS数据；
接收来自第一接入网设备的第一指示信息，第一指示信息用于指示第一DRB；
接收来自第一接入网设备的第二指示信息，第二指示信息用于指示第一停止数据包，第一停止数据包通过该第一RB接收；
在根据第二指示信息确定满足第一条件的情况下，递交通过第一DRB接收的第二数据，第一数据和第二数据属于同一MBS业务。
本申请实施例中，第一终端设备可以接收到第一接入网设备通过第一MRB向第一终端设备发送第一数据，用于指示第一DRB的第一指示信息，以及用于指示第一停止数据包的第二指示信息，可以根据第一停止数据包判断是否满足第一条件，在判断出满足第一条件的情况下，可以递交通过第一DRB传输的第二数据，在判断出不满足第一条件的情况下，不可以递交通过第一DRB传输的第二数据，可以避免不管满不满足第一条件，在第一终端设备接收到通过第一DRB传输的第二数据之后就递交第二数据的情况下，可以保证第一终端设备通过第一MRB接收并递交的数据和通过第一DRB接收并递交的数据是连续且顺序没有混乱的，从而可以提高MBS传输的可靠性。此外，第一DRB与第一MRB的配置可以是独立的，可以避免第一DRB的配置受限于第一MRB，从而可以提高DRB配置的灵活性。
作为一种可能的实施方式，第一终端设备在根据第二指示信息确定满足第一条件的情况下，递交通过第一DRB接收的第二数据可以包括：
在第一终端设备由第一接入网设备切换至第二接入网设备，第二接入网设备不支持MBS， 且根据第二指示信息确定满足第一条件的情况下，递交通过第一DRB接收的第二数据。
本申请实施例中，第一终端设备在由第一接入网设备切换至第二接入网设备，且第二接入网设备不支持MBS的情况下，可以在满足第一条件的情况下递交通过DRB传输的数据，可以保证第一终端设备切换到目标接入网设备，但目标接入网设备不支持MBS的情况下MBS的可靠性。
作为一种可能的实施方式，该通信方法还可以包括：
通过第一DRB接收来自第一接入网设备的第二数据，第一MRB与第一DRB之间存在对应关系；
第一终端设备递交通过第一DRB接收的第二数据包括：
根据该对应关系递交通过第一DRB接收的第二数据。
本申请实施例中，第一终端设备可以接收到来自第一接入网设备通过第一DRB发送的与第一数据属于同一MBS业务的第二数据，可以根据第二指示信息确定满足第一条件之后递交通过第一DRB传输的数据。此外，由于不同MBS业务使用的MRB不同，不同单播业务使用的DRB不同，因此，第一MRB与第一DRB之间存在对应关系，以便第一终端设备在由支持MBS的第一接入网设备切换到不支持MBS的第二接入网设备，且满足第一条件的情况下，可以根据该对应关系确定哪个MRB与哪个DRB传输的数据为同一MBS业务的数据，进而可以递交通过第一DRB传输的第二数据，可以提高MBS传输的可靠性。
作为一种可能的实施方式，该通信方法还可以包括：
接收来自第一接入网设备的第三指示信息，第三指示信息用于指示该对应关系。
本申请实施例中，第一终端设备可以接收到来自第一接入网设备的第一MRB与第一DRB之间的对应关系，可以根据第三指示信息确定第一MRB与第一DRB之间的对应关系，进而在由支持MBS的第一接入网设备切换到不支持MBS的第二接入网设备，且满足第一条件的情况下，可以根据该对应关系递交通过第一DRB传输的第二数据，可以提高MBS传输的可靠性。
作为一种可能的实施方式，第一终端设备递交通过第一DRB接收的第二数据包括：
向第一接入网设备发送第四指示信息，第四指示信息用于指示满足第一条件；
通过第一DRB接收来自第一接入网设备的第二数据；
递交第二数据。
本申请实施例中，第一终端设备可以向第一接入网设备发送用于指示满足第一条件的指示信息，以便第一接入网设备可以根据该指示信息通过第一DRB向第一终端设备发送与第一数据属于同一MBS业务的第二数据，第一终端设备可以通过第一DRB接收来自第一接入网设备的第二数据并递交，在未向第一接入网设备发送该指示信息的情况下无法接收到第一接入网设备通过第一DRB向第一终端设备发送的数据，可以保证通过第一MRB接收并递交的数据和通过第一DRB接收并递交的数据是连续且没有乱序的，从而可以提高MBS的可靠性，同时可以减少第一终端设备根据多个无线承载的状态判断动作的行为，相应的判断流程通过信令完成可以减少判断的复杂度。
作为一种可能的实施方式，该通信方法还可以包括：
接收来自第一接入网设备的第五指示信息，第五指示信息用于指示通过第一DRB传输的数据在满足第一条件后递交；
第一终端设备在根据第二指示信息确定满足第一条件的情况下，递交通过第一DRB接收的第二数据包括：
根据第五指示信息，在根据第二指示信息确定满足第一条件的情况下，递交通过第一DRB 接收的第二数据。
本申请实施例中，第一终端设备可以接收到第一接入网设备配置的通过DRB传输的数据在满足第一条件后递交，可以根据该配置在满足第一条件后递交通过DRB传输的数据，可以避免通过第一MRB接收并递交的数据和通过第一DRB接收并递交的数据不连续或乱序，并且可以提高MSB传输的可靠性。
作为一种可能的实施方式，第一指示信息还用于指示该对应关系。
本申请实施例中，第一MRB与第一DRB之间的对应关系可以复用第一指示信息进行指示，不需要通过专门的消息或信令进行指示，可以减少消息或信令的传输，从而可以节约传输资源。
作为一种可能的实施方式，第一条件可以为：
通过MRB接收的数据中停止数据包和/或该停止数据包之前的数据包递交完成；或者
MRB对应的接收窗中第一个未递交数据包的包号大于或等于通过该MRB接收的停止数据包的包号；或者
MRB被释放掉。
本申请实施例中，第一条件可以保证通过MRB接收的停止数据包前接收的数据递交完成，或者通过MRB接收的停止数据包以及停止数据包前接收的数据递交完成，可以避免MBS业务数据递交到高层时乱序，并且可以很大程度保证通过MRB接收的数据全部递交，从而可以提高MBS的可靠性。
第三方面公开一种通信装置，该通信装置可以为第一接入网设备，也可以为第一接入网设备中的模块(例如，芯片)。该通信装置可以包括：
发送单元，用于通过第一MRB向第一终端设备发送第一数据，第一数据为MBS数据；
发送单元，还用于向第一终端设备发送第一指示信息，第一指示信息用于指示第一DRB；
发送单元，还用于向第一终端设备发送第二指示信息，第二指示信息用于指示第一停止数据包，第一停止数据包通过第一MRB发送。
作为一种可能的实施方式，发送单元向第一终端设备发送第一指示信息包括：
在第一终端设备由第一接入网设备切换至第二接入网设备，且第二接入网设备不支持MBS的情况下，向第一终端设备发送第一指示信息；
发送单元向第一终端设备发送第二指示信息包括：
在第一终端设备由第一接入网设备切换至第二接入网设备，且第二接入网设备不支持MBS的情况下，向第一终端设备发送第二指示信息。
作为一种可能的实施方式，发送单元，还用于通过第一DRB向第一终端设备发送第二数据，第一数据和第二数据属于同一MBS业务，第一MRB与第一DRB之间存在对应关系。
作为一种可能的实施方式，发送单元，还用于向第一终端设备发送第三指示信息，第三指示信息用于该对应关系。
作为一种可能的实施方式，该通信装置还可以包括：
接收单元，用于接收来自第一终端设备的第四指示信息，第四指示信息用于指示满足第一条件；
发送单元，还用于通过第一DRB向第一终端设备发送第二数据，第一数据和第二数据属于同一MBS业务。
作为一种可能的实施方式，发送单元，还用于向第一终端设备发送第五指示信息，第五 指示信息用于指示通过第一DRB传输的数据在满足第一条件后递交。
作为一种可能的实施方式，第一指示信息还用于指示该对应关系。
作为一种可能的实施方式，第一条件可以为：
通过MRB接收的数据中停止数据包和/或该停止数据包之前的数据包递交完成；或者
MRB对应的接收窗中第一个未递交数据包的包号大于或等于通过该MRB接收的停止数据包的包号；或者
MRB被释放掉。
第四方面公开一种通信装置，该通信装置可以为第一终端设备，也可以为第一终端设备中的模块(例如，芯片)。该通信装置可以包括：
接收单元，用于通过第一MRB接收来自第一接入网设备的第一数据，第一数据为MBS数据；
接收单元，还用于接收来自第一接入网设备的第一指示信息，第一指示信息用于指示第一DRB；
接收单元，还用于接收来自第一接入网设备的第二指示信息，第二指示信息用于指示第一停止数据包，第一停止数据包通过第一MRB接收；
递交单元，用于在根据第二指示信息确定满足第一条件的情况下，递交通过第一DRB接收的第二数据，第一数据和第二数据属于同一MBS业务。
作为一种可能的实施方式，递交单元，具体用于在第一终端设备由第一接入网设备切换至第二接入网设备，第二接入网设备不支持MBS，且根据第二指示信息确定满足第一条件的情况下，递交通过该DRB接收的第二数据。
作为一种可能的实施方式，接收单元，还用于通过该DRB接收来自第一接入网设备的第二数据，第一MRB与第一DRB之间存在对应关系；
递交单元递交通过第一DRB接收的第二数据包括：
根据该对应关系递交通过第一DRB接收的第二数据。
作为一种可能的实施方式，接收单元，还用于接收来自第一接入网设备的第三指示信息，第三指示信息用于指示该对应关系。
作为一种可能的实施方式，递交单元递交通过第一DRB接收的第二数据包括：
向第一接入网设备发送第四指示信息，第四指示信息用于指示满足第一条件；
通过第一DRB接收来自第一接入网设备的第二数据；
递交第二数据。
作为一种可能的实施方式，接收单元，还用于接收来自第一接入网设备的第五指示信息，第五指示信息用于指示通过第一DRB传输的数据在满足第一条件后递交；
递交单元，具体用于根据第五指示信息，在根据第二指示信息确定满足第一条件的情况下，递交通过第一DRB接收的第二数据。
作为一种可能的实施方式，第一指示信息还用于指示该对应关系。
作为一种可能的实施方式，第一条件可以为：
通过MRB接收的数据中停止数据包和/或该停止数据包之前的数据包递交完成；或者
MRB对应的接收窗中第一个未递交数据包的包号大于或等于通过该MRB接收的停止数据包的包号；或者
MRB被释放掉。
第五方面公开一种通信装置。该通信装置可以包括处理器，用于使得该通信装置实现第一方面或第一方面的任一实施方式公开的通信方法。可选的，该通信装置还可以包括存储器、和/或收发器，收发器用于接收来自该通信装置之外的其它通信装置的信息，以及向该通信装置之外的其它通信装置输出信息，当处理器执行存储器存储的计算机程序时，使得处理器执行第一方面或第一方面的任一实施方式公开的通信方法。
第六方面公开一种通信装置。该通信装置可以包括处理器，用于使得该通信装置实现第二方面或第二方面的任一实施方式公开的通信方法。可选的，该通信装置还可以包括存储器、和/或收发器，收发器用于接收来自该通信装置之外的其它通信装置的信息，以及向该通信装置之外的其它通信装置输出信息，当处理器执行存储器存储的计算机程序时，使得处理器执行第二方面或第二方面的任一实施方式公开的通信方法。
第七方面公开一种通信系统，该通信系统包括第五方面的通信装置和第六方面的通信装置。
第八方面公开一种计算机可读存储介质，该计算机可读存储介质上存储有计算机程序或计算机指令，当该计算机程序或计算机指令运行时，实现如上述各方面公开的通信方法。
第九方面公开一种芯片，包括处理器，用于执行存储器中存储的程序，当程序被执行时，使得芯片执行上面的方法。
作为一种可能的实施方式，存储器位于芯片之外。
第十方面公开一种计算机程序产品，该计算机程序产品包括计算机程序代码，当该计算机程序代码被运行时，使得上述通信方法被执行。
可以理解地，上述第三方面、第四方面、第五方面和第六方面公开的通信，第七方面公开的通信系统，第八方面公开的计算机可读存储介质，第九方面公开的芯片，以及第十方面公开的计算机程序产品均用于执行本申请第一方面以及第一方面中任一可能的实施方式公开，或第二方面以及第二方面中任一种可能的实施方式公开所提供的方法。因此，其所能达到的有益效果可参考对应方法中的有益效果，此处不再赘述。
附图说明
图1是本申请实施例公开的一种网络架构示意图；
图2是本申请实施例公开的一种MBS数据传输的示意图；
图3是本申请实施例公开的一种MBS传输的用户面协议栈结构的示意图；
图4是本申请实施例公开的一种小区测量及切换方法的流程示意图；
图5是本申请实施例公开的一种通信方法的流程示意图；
图6是本申请实施例公开的一种终端设备由第一接入网设备切换到第二接入网设备的示意图；
图7是本申请实施例公开的另一种通信方法的流程示意图；
图8是本申请实施例公开的又一种通信方法的流程示意图；
图9是本申请实施例公开的一种通信装置的结构示意图；
图10是本申请实施例公开的另一种通信装置的结构示意图；
图11是本申请实施例公开的又一种通信装置的结构示意图；
图12是本申请实施例公开的又一种通信装置的结构示意图。
具体实施方式
本申请实施例公开了一种通信方法及装置，用于提高MBS传输的可靠性。以下分别进行详细说明。
为了更好地理解本申请实施例公开的一种通信方法及装置，下面先对本申请实施例使用的网络架构进行描述。请参阅图1，图1是本申请实施例公开的一种网络架构示意图。如图1所示，该网络结构可以包括数据服务器、一个或多个核心网设备、两个或两个以上接入网设备以及一个或多个终端设备。
数据服务器，用于向核心网设备发送MBS数据。
核心网设备，用于在接入网设备支持MBS的情况下，通过MBS会话(session)向接入网设备发送MBS数据，在接入网设备不支持MBS的情况下，通过单播(nuicast)协议数据单元(protocol data unit，PDU)会话向接入网设备发送MBS数据。
接入网设备，用于在支持MBS的情况下，通过MRB向终端设备发送MBS数据，在不支持MBS的情况下，通过DRB向终端设备发送MBS数据。
终端设备处于支持MBS的接入网设备的范围内时，通过MRB接收来自接入网设备的MBS数据，处于不支持MBS的接入网设备的范围内时，通过DRB接收来自接入网设备的MBS数据。
在终端设备由支持MBS的源接入网设备切换到不支持MBS的目标接入网设备时，终端设备可以通过DRB接收来自接入网设备的MBS数据。
应理解，在接入网设备支持MBS的情况下，接入网设备可以通过多播广播方式向终端设备发送MBS数据，在接入网设备不支持MBS的情况下，接入网设备可以通过单播方式向终端设备发送MBS数据。
终端设备，又可以称之为UE、移动台(mobile station，MS)、移动终端(mobile terminal，MT)等，是一种向用户提供语音和/或数据连通性的设备。终端设备可以为手持终端、客户终端设备(customer premise equipment，CPE)笔记本电脑、用户单元(subscriber unit)、蜂窝电话(cellular phone)、智能电话(smart phone)、无线数据卡、个人数字助理(personal digital assistant，PDA)电脑、平板型电脑、无线调制解调器(modem)、手持设备(handheld)、膝上型电脑(laptop computer)、会话启动协议(session initiation protocol，SIP)电话、无绳电话(cordless phone)或者无线本地环路(wireless local loop，WLL)台、机器类型通信(machine type communication，MTC)终端，可穿戴设备(如智能手表、智能手环、计步器等)，车载设备(如汽车、自行车、电动车、飞机、船舶、火车、高铁等)、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、智能家居设备(如冰箱、电视、空调、电表等)、智能机器人、车间设备、无人驾驶(self driving)中的无线终端、远程手术(remote medical surgery)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，或智慧家庭(smart home)中的无线终端、飞行设备(如智能机器人、热气球、无人机、飞机等)或其他可以接入网络的设备。
接入网设备为终端设备提供无线接入的设备，主要负责空口侧的无线资源管理、QoS流管理、数据压缩和加密等功能。接入网设备可以包括各种形式的基站，例如：宏基站，微基站(也称为小站)，中继站，接入点等。接入网设备还可以包括无线上网(wireless fidelity，WiFi)接入节点(access point，AP)。接入网设备还可以包括全球微波互联接入(worldwide interoperability for microwave access，WiMax)基站(base station，BS)。
核心网设备可以为核心网络(core network，CN)设备在不同的系统对应不同的设备。例如，在3G中可以对应通用分组无线服务技术(general packet radio service，GPRS)的服务支持节点(serving GPRS support node，SGSN)和/或GPRS的网关支持节点(gateway GPRS support node，GGSN)。再例如，在4G中可以对应移动性管理实体(mobility management entity，MME)、服务网关(serving gateway，SGW)、公用数据网络(public data network，PDN)网关(PDN gateway，PGW)、策略与计费规则功能(policy and charging rules function，PCRF)网元、归属签约用户服务器(home subscriber server，HSS)等中的一个或多个。再例如，在5G中可以对应接入和移动性管理功能(access and mobility management function，AMF)网元、会话管理功能(session management function，SMF)网元、用户面功能(user plane function，UPF)网元、策略控制功能(policy control function，PCF)网元、统一数据管理(unified data management，UDM)网元等网元或设备中的一个或多个。应理解，核心网设备在其他通信设备中可以为其他设备或网元。
数据服务器用于提供MBS数据。
需要说明的是，图1所示的网络架构中不限于仅包括图中所示的终端设备、接入网设备和核心网设备，还可以包括其它未在图中表示的终端设备、接入网设备或核心网设备，具体本申请在此处不再一一列举。
为了更好地理解本申请实施例，下面先对本申请实施例的相关技术进行描述。
MBS业务是面向多个UE的业务，可以包括广播业务，组播/多播业务。例如，从应用角度来看，MBS可以包括直播业务、公共安全业务、批量软件更新业务等。
请参阅图2，图2是本申请实施例公开的一种MBS数据传输的示意图。如图2所示，MBS数据来自数据服务器。数据服务器可以将MBS数据发送给核心网设备。核心网设备接收到来自数据服务器的MBS数据之后，可以将MBS数据发送给接入网设备。接入网设备接收到来自核心网设备的MBS数据之后，可以将MBS数据发送给接收MBS数据的一个或多个UE。
数据服务器与核心网设备之间可以通过公共传输通道(MBS service)传输MBS数据。核心网设备与接入网设备之间可以通过公共的传输通道MBS会话(MBS session)传输MBS，每个MBS会话中包括至少一个MBS服务质量(quality of service，QoS)流(flow)。而从接入网设备向UE发送MBS数据的时候，MBS数据中的数据包可以通过MRB进行传输。MRB具有两种传输模式，一种传输模式为点到多点(point to multi-point，PTM)传输，另一种传输模式为点到点(point to point，PTP)传输。PTM传输为接入网设备将MBS数据传输给多个UE，PTP传输为接入网设备将MBS数据传输给一个UE。
接入网设备与UE进行通信时，接入网设备与UE之间具有相应地的协议栈。例如，用户面协议栈可以包括无线资源控制(radio resource control，RRC)层、业务数据适配协议(service data adaptation protocol,SDAP)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(physical，PHY)层等。其中，物理层位于最低层(即层一)，MAC层、RLC层、PDCP层以及SDAP层属于第二层(即层二)，RRC层属于第三层(即层三)。
请参阅图3，图3是本申请实施例公开的一种MBS传输的用户面协议栈结构的示意图。如图3所示，对于MBS传输的用户面协议栈来说，PHY位于最底层，MAC层位于PHY层之上，RLC层位于MAC层之上，PDCP层位于RLC层之上。
MBS业务通常为接入网设备向终端设备发送的业务，因此，在传输MBS数据时，MBS数据的传输流程为：
MBS数据先到达接入网设备的PDCP层，经过接入网设备的PDCP层的处理以后传输到接入网设备的RLC层和MAC层，经过相应的处理之后，从接入网设备的物理层发送出去，通过空口传输给UE。UE的各个协议层按照与接入网设备相反的处理顺序对MBS数据依次进行对应的处理。
应理解，上面指示对MBS数据的传输流程的示例性说明，并不对其构成限定。例如，可以跳过上面的某一层。
在接入网设备和UE侧可以形象地将各层对MBS数据的处理结合起来称为无线承载，对于无线承载里的每个数据，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层的PDCP实体。
每个无线承载配置里面可以包括一个PDCP实体，同时无线承载配置可以关联一个或多个RLC实体，并且每个RLC实体可以对应一个逻辑信道(logic channel，LCH)。
在终端设备移动过程中，终端设备接收到来自各个小区的信号的强度将会不断发生变化。例如，在终端设备正在远离当前接入的小区(记为小区A)的情况下，终端设备接收到的来自小区A的信号强度将会不断降低。当终端设备接收到的来自小区A的信号强度降低到一定值的情况下，终端设备在小区A上继续传输业务将会导致业务出现卡顿，拥塞，甚至掉线等情况。
因此，为了保证终端设备的业务的传输质量，终端设备在移动过程中，若确定小区A的邻区(记为小区B)的信号强度大于小区A的信号强度，则终端设备可以向接入网设备上报该事件(即小区B的信号强度大于小区A的信号强度)，以触发接入网设备发起小区切换流程，将终端设备由小区A切换到小区B。
这样，终端设备可以始终保持在信号强度较强的小区上传输业务，从而可以保证终端设备业务的传输质量。
请参阅图4，图4是本申请实施例公开的一种小区测量及切换方法的流程示意图。如图4所示，该方法可以包括以下步骤。
401.终端设备接入到第一接入网设备。
终端设备接入接入网设备可以实现为：终端设备驻留在小区A上，并进入连接态。其中，第一接入网设备可以为上述小区A。
402.第一接入网设备向终端设备发送测量配置参数。
相应的，终端设备接收来自第一接入网设备的测量配置参数。
测量配置参数可以承载在第一接入网设备向终端设备发送的RRC重配置(RRCReconfiguration)消息中。也即是说，第一接入网设备可以向终端设备发送RRC重配置消息，RRC重配置消息可以包括测量配置参数(MeasConfig)。
测量配置参数可以包括测量频点/小区信息、上报门限配置、滤波参数配置、定时器时长配置等信息中的一个或多个。
测量频点/小区信息用于指示待测量小区，以及待测量小区对应的频点。测量频点/小区信息可以包括终端设备当前接入的小区的信息。或者，测量频点/小区信息可以只包括需要测量的频点信息，此时，当前接入的小区的信息可以通过RRC重配置消息进行指示。
上报门限配置，用于指示终端设备向第一接入网设备发送测量报告的条件。也即是说，上报门限配置用于指示终端设备根据测量结果确定测量报告，以及向第一接入网设备发送测量报告的条件。
滤波系数配置，用于指示对终端设备当前测量的小区信号强度，以及终端设备前一次小 区测量时确定的小区的测量结果进行滤波，确定小区的测量结果。
403.终端设备根据测量配置参数测量频点或小区的信号强度，确定测量结果。
举例说明，测量配置参数指示需要测量的小区包括小区A和小区B。
终端设备可以根据测量配置参数中的测量频点/小区信息，启动PHY层测量小区A的信号强度，之后终端设备的PHY层可以向终端设备的RRC层发送小区A的信号强度。之后终端设备的RRC层可以根据小区A的信号强度，小区A前一次的测量结果，以及滤波系数，确定小区A的测量结果。
终端设备可以根据测量配置参数中的测量频点/小区信息，启动PHY层测量小区B的信号强度，之后终端设备的PHY层可以向终端设备的RRC层发送小区B的信号强度。之后终端设备的RRC层可以根据小区B的信号强度，小区B前一次的测量结果，以及滤波系数，确定小区B的测量结果。
404.终端设备根据测量结果，确定测量报告。
在步骤403中，终端设备的RRC层确定了各个小区的测量结果。终端设备的RRC层可以评估各个小区的测量结果，确定本次的测量结果是否满足需要上报的测量事件中的一种，若满足，则终端设备的RRC层可以生成相应的测量报告，以及可以向第一接入网设备发送该测量报告。
测量报告可以用于向接入网设备报告测量事件。
405.终端设备向第一接入网设备发送测量报告。
相应地，第一接入网设备接收来自终端设备的测量报告。
406.第一接入网设备根据测量报告确定第二接入网设备，并向第二接入网设备发送切换请求(Handover Request)。
相应的，第二接入网设备接收来自第一接入网设备的切换请求。
其中，第二接入网设备为终端设备需要切换到的接入网设备，即目标接入网设备。
需要指出的是，第一接入网设备也称为源接入网设备，对应于上述步骤3中记载的小区A。第二接入网设备也称为目标接入网设备，对应于上述步骤403中记载的小区B。
407.第二接入网设备向第一接入网设备发送切换请求确认信息(Handover Request ACK)。
相应地，第一接入网设备接收来自第二接入网设备的切换请求确认信息。
第二接入网设备接收到来自第一接入网设备的切换请求之后，可以确定自身的设备连接数、时频资源的分配、负载等情况。在第二接入网设备确定能够允许终端设备接入的情况下，第二接入网设备可以向第一接入网设备发送切换请求确认信息。
切换请求确认信息中可以包括小区无线网络临时标识(cell radio network temporary identifier，C-RNTI)、第二接入网设备的安全算法等中的一项或多项。
408.第一接入网设备向终端设备发送RRC重配置消息。
相应地，终端设备接收来自第一接入网设备的RRC重配置消息。
RRC重配置消息可以包括第二接入网设备向第一接入网设备发送的切换请求确认信息。也即是说，在该步骤408中第一接入网设备可以采用透传的方式，将第二接入网设备向第一接入网设备发送的切换请求确认信息发送给终端设备。
在第一接入网设备和第二接入网设备中存在NR系统中的接入网设备的情况下，RRC重配置消息可以包括第二接入网设备的相关信息、终端设备接入第二接入网设备所需的配置参数等中的一项或多项。
具体地，RRC重配置消息可以包括小区B的物理小区标识(physical cell identifier，PCI)、 小区B的频率信息(如小区B的频点，或者其他频率信息)、小区B为终端设备分配的C-RNTI、接入小区B所需的随机接入信道(random access channel，RACH)资源信息(如专用RACH资源和/或公共RACH资源)等中的一项或多项。
409.终端设备向第二接入网设备发起随机接入。
需要指出的是，当终端设备向第二接入网设备发起随机接入时，终端设备先需要断开与第一接入网设备的连接。在终端设备成功接入第二接入网设备之间，终端设备传输的数据会暂时中断传输。
410.在随机接入成功之后，终端设备向第二接入网设备发送RRC重配置完成信息。
基于上述步骤401-步骤410，终端设备可以完成小区测量以及小区切换。
在当前的小区切换的场景中，存在第一接入网设备支持多播广播传输方式，第二接入网设备不支持多播广播传输方式的场景。
在该场景下，若终端设备与第一接入网设备之间正在传输MBS数据，则在终端设备切换到第二接入网设备之后，由于第二接入网设备不支持MBS，因此，终端设备无法继续通过MRB从第二接入网设备接收MBS数据，这将会无法保证MBS的业务连续性，以致降低了MBS的可靠性。
为解决上述技术问题，本申请提供了一种通信方法，用于在终端设备从支持MBS的第一接入网设备切换至不支持MBS的第二接入网设备的情况下，可以保证MBS的可靠性。
该方法包括：在第一接入网设备接收到终端设备的测量报告之后，第一接入网设备确定第二接入网设备是否支持MBS，在第二接入网设备不支持MBS的情况下，第一接入网设备指示第一DRB和第一停止数据包。相应的，终端设备在根据第一停止数据包确定满足第一条件的情况下，递交通过第一DRB传输的数据。
这样，由于终端设备与第一接入网设备之间通过单播的形式传输MBS数据，因此，在终端设备随后向第二接入网设备切换的过程中，第一接入网设备和第二接入网设备之间直接将正在传输的MBS数据按照当前接收单播业务的终端设备切换的方式将MBS业务切换到第二接入网设备，解决了由于第二接入网设备不支持MBS导致的MBS可靠性低的问题。
基于上述网络架构，请参阅图5，图5是本申请实施例公开的一种通信方法的流程示意图。如图5所示，该通信方法可以包括以下步骤。
501.第一接入网设备通过第一MRB向第一终端设备发送第一数据。
相应地，第一终端设备通过第一MRB接收来自第一接入网设备的第一数据。
在第一接入网设备支持MBS，且第一终端设备接入第一接入网设备的情况下，如果有传输给第一终端设备的MBS业务，则第一接入网设备可以为第一终端设备配置第一MRB，第一终端设备建立第一MRB，之后可以通过第一MRB向第一终端设备发送第一数据。第一数据为MBS数据，即MBS业务的数据。第一数据为MBS数据中的部分数据。
第一接入网设备支持MBS，可以理解为第一接入网设备支持MBS业务。
502.第一接入网设备向第一终端设备发送第一指示信息。
相应地，第一终端设备接收来自第一接入网设备的第一指示信息。
第一接入网设备除了与第一终端设备建立MRB之外，还可以与第一终端设备建立DRB。因此，在第一接入网设备需要与第一终端设备建立第一DRB的情况下，第一接入网设备可以向第一终端设备发送第一指示信息，第一指示信息用于指示第一DRB。第一指示信息指示第一DRB，可以理解为指示建立第一DRB。
第一终端设备接收到来自第一接入网设备的第一指示信息之后，可以根据第一指示信息建立第一DRB。第一指示信息可以指示第一DRB的信息。
一种情况下，第一DRB的信息可以包括第一DRB的标识、第一DRB的PDCP配置信息、第一DRB的RLC配置信息、第一DRB的安全配置信息等中一个或多个。
在另一种情况下，第一DRB可以沿用第一MRB的PDCP配置信息和/或PTP RLC配置信息。第一DRB可以沿用第一MRB对应的传输窗的传输状态以及传输参数。传输窗的传输状态以及传输参数可以包括：当前发送的序列号(sequence number，SN)最大的数据包、发送成功的数据包、未发送成功的数据包、传输窗大小、传输窗相关定时器的运行状态等中的一个或多个。
下面对第一接入网设备向第一终端设备发送第一指示信息的方式进行说明。
在一种情况下，第一接入网设备可以通过配置信息向第一终端设备发送第一指示信息。例如，第一接入网设备可以向第一终端设备发送第一配置信息，第一配置信息可以包括第一指示信息。应理解，第一配置信息为用于配置第一DRB的配置信息。
在另一种情况下，第一接入网设备可以通过信令向第一终端设备发送第一指示信息。例如，第一接入网设备可以通过高层信令或其他信令向第一终端设备发送第一指示信息。
在又一种情况下，第一接入网设备可以通过消息向第一终端设备发送第一指示信息。例如，第一接入网设备可以通过RRC消息向第一终端设备发送第一指示信息。
应理解，上面是对第一接入网设备向第一终端设备发送第一指示信息的方式的示例性说明，并不对第一接入网设备发送第一指示信息的方式构成限定。
在一种情况下，第一指示信息可以是第一接入网设备在与步骤501中使用的第一MRB一起配置给第一终端设备，即上述第一DRB可以与步骤501中使用的第一MRB一起配置给第一终端设备。
在另一种情况下，第一指示信息可以是第一接入网设备配置了步骤501中使用的第一MRB之后配置后给第一终端设备，即上述第一DRB可以是在步骤501中使用的第一MRB之后配置的。
在又一种情况下，第一指示信息可以是第一接入网设备配置了步骤501中使用的第一MRB之后配置后，且第一终端设备需要由第一接入网设备切换到第二接入网设备的情况下配置的。
第一接入网设备在向第一终端设备发送第一指示信息之前，可以接收到来自第一终端设备的测量报告，该测量报告用于触发第一接入网设备将终端设备切换到第二接入网设备。
在又一种情况下，第一指示信息可以是第一接入网设备配置了步骤501中使用的第一MRB之后配置后，第一终端设备需要由第一接入网设备切换到第二接入网设备，且第二接入网设备不支持MBS的情况下配置的。
第一接入网设备在向第一终端设备发送第一指示信息之前，可以接收到来自第一终端设备的测量报告，该测量报告用于触发第一接入网设备将终端设备切换到第二接入网设备，第二接入网设备为不支持MBS的接入网设备。
应理解，在第一终端设备由第一接入网设备切换到第二接入网设备的情况下，第一接入网设备为源接入网设备，第二接入网设备为目标接入网设备。
第一接入网设备可以通过以下三种情况确定第二接入网设备是否支持MBS。
在一种情况下，第一接入网设备可以根据第一接入网设备与第二接入网设备信令交互来确定第二接入网设备是否支持MBS。
具体地，第一接入网设备可以向第二接入网设备发送请求信息。该请求信息用于请求查询第二接入网设备是否支持MBS。
相应地，第二接入网设备接收来自第一接入网设备的请求信息，之后可以向第一接入网设备发送响应信息。该响应信息用于指示第二接入网设备是否支持MBS。
相应地，第一接入网设备接收来自第二接入网设备的响应信息，之后可以根据响应信息确定第二接入网设备是否支持MBS。
一种示例，该响应信息中的一个比特位用于指示第二接入网设备是否支持MBS。
例如，当该比特位的值为“0”时，该响应信息用于指示第二接入网设备不支持MBS；当该比特位的值为“1”时，该响应信息用于指示第二接入网设备支持MBS。
再例如，当该比特位的值为“1”时，该响应信息用于指示第二接入网设备不支持MBS；当该比特位的值为“0”时，该响应信息用于指示第二接入网设备支持MBS。
可见，第一接入网设备可以根据响应信息中该比特位的值确定第二接入网设备是否支持MBS。
在另一种情况下，第一接入网设备可以通过操作维护管理(operation administration and maintenance，OAM)系统的配置确定第二接入网设备是否支持MBS。OAM系统可以向第一接入网设备发送配置信息。
一种示例，该配置信息可以包括哪些接入网设备支持MBS，哪些不支持MBS。
另一种示例，该配置信息可以包括支持MBS的接入网设备。
又一种示例，该配置信息可以包括不支持MBS的接入网设备。
第一接入网设备可以根据OMA系统发送的配置信息确定第二接入网设备是否支持MBS。
在又一种情况下，第一接入网设备可以根据第一接入网设备和第二接入网设备之间终端设备的历史切换记录进行判断。
例如，假设第一接入网设备最开始不知道第二接入网设备是否支持MBS，但是有个终端设备之前从第一接入网设备切换到了该第二接入网设备，切换过程中或者切换后才知道第二接入网设备是否支持MBS，第一接入网设备可以存储切换记录。之后再有终端设备由第一接入网设备向第二接入网设备进行切换的时候源，第一接入网设备可以根据存储的切换记录确定第二接入网设备是否支持MBS。
503.第一接入网设备向第一终端设备发送第二指示信息。
相应地，第一终端设备接收来自第一接入网设备的第二指示信息。
第一接入网设备可以向第一终端设备发送第二指示信息。第二指示信息用于指示第一停止数据包，第一停止数据包通过第一MRB发送，即通过第一MRB进行传输。
一种情况下，第一停止数据包，可以为通过第一MRB发送的数据的最后一个数据包。在通过第一MRB发送的数据为第一数据的情况下，第一停止数据包为第一数据中的最后一个数据包。第二指示信息可以通过指示第一停止数据包的包号来指示第一停止数据包。第一停止数据包的包号可以为第一停止数据包的PDCP服务数据单元(service data unit，SDU)序列号(sequence number，SN)，也可以为第一停止数据包的PDCP PDU SN，还可以为分组无线服务(general packet radio service，GPRS)隧道协议-用户面(GPRS tunnelling protocol-U，GTP-U)SN。
在另一种情况下，第一停止数据包，可以为通过第一MRB发送的包括结束标记(end marker)的PDCP数据包，即是只包括结束标记的PDCP数据包。同理，第二指示信息可以通过指示PDCP数据包的包号来指示第一停止数据包。第一停止数据包的包号可以为PDCP数据 包的PDCP SDU SN，也可以为这个数据包的PDCP PDU SN。
下面对第一接入网设备向第一终端设备发送第二指示信息的方式进行说明。
在一种情况下，第二指示信息可以与第一指示信息一起通过配置信息发送给第一终端设备。此配置信息为用于配置第一DRB的配置信息。在此种情况下，第二指示信息可以是第一停止数据包对应的PDCP PDU SN。
在另一种情况下，第一接入网设备可以将第二指示信息通过高层信令或其他信令发送给第一终端设备。信令可以是RRC消息，比如RRC连接释放消息，也可以为PDCP控制PDU，还可以为RLC控制PDU，还可以为MAC控制元素(MAC control element，MAC CE)，还可以为其他信令等。
在又一种情况下，第一接入网设备可以将第二指示信息携带在数据包的包头中发送给第一终端设备。
应理解，上面是对第一接入网设备向第一终端设备发送第二指示信息的方式的示例性说明，并不对第一接入网设备发送第二指示信息的方式构成限定。
在一种情况下，第二指示信息可以是第一终端设备需要由第一接入网设备切换到第二接入网设备的情况下，第一接入网设备向第一终端设备发送的。
在另一种情况下，第二指示信息可以是第一终端设备需要由第一接入网设备切换到第二接入网设备，且第二接入网设备不支持MBS的情况下，第一接入网设备向第一终端设备发送的。
为了保证第二指示信息能够被第一终端设备成功接收，一种情况下，第一接入网设备可以向第一终端设备发送多次第二指示信息。多次第二指示信息指示的第一停止数据包可以相同，也可以不同。另一种情况下第一停止数据包可以包括一个或多个数据包。
应理解，步骤502和步骤503可以串行执行，可以为先执行步骤502再执行步骤503，也可以为先执行步骤503再执行步骤502。步骤502和步骤503也可以并行执行。此时，第一接入网设备可以通过两个消息或信令分别向第一终端设备发送第一指示信息和第二指示信息，也可以通过一个消息或信令向第一终端设备发送第一指示信息和第二指示信息，即第一指示信息和第二指示信息可以通过同一消息或信令进行发送。
504.第一终端设备在根据第二指示信息确定满足第一条件的情况下，递交通过第一DRB接收的第二数据。
第一终端设备接收到来自第一接入网设备的第二指示信息之后，可以根据第二指示信息确定或判断是否满足第一条件，在根据第二指示信息确定满足第一条件的情况下，可以递交通过第一DRB接收的第二数据。在根据第二指示信息确定不满足第一条件的情况下，可以不递交通过第一DRB接收的第二数据。
第一数据和第二数据属于同一MBS业务，即第一数据和第二数据为同一MBS业务的数据。
一种情况下，第一条件可以为通过MRB接收的数据中停止数据包和/或该停止数据包之前的数据包递交完成。因此，在通过第一MRB接收的数据中第一停止数据包和/或第一停止数据包之前的数据包递交完成的情况下，可以确定满足第一条件。
第一条件可以理解为第一条件可以为通过MRB接收的数据中停止数据包递交完成，也可以理解为第一条件为通过MRB接收的数据中停止数据包之前的数据包递交完成，还可以理解为通过MRB接收的数据中停止数据包以及该停止数据包之前的数据包递交完成。
在数据包按照数据包的包号顺序递交，且没有丢包的情况下，通过MRB接收的数据中停止数据包递交完成，可以理解为通过MRB接收的数据中停止数据包以及该停止数据包之前的 数据包递交完成。在数据包按照数据包的包号顺序递交，但有丢包的情况下，通过MRB接收的数据中停止数据包递交完成，可以理解为通过MRB接收的数据包括的停止数据包以及该停止数据包之前的数据包中除丢掉的数据包之外其他数据包递交完成。
在数据包未按照数据包的包号顺序递交的情况下，通过MRB接收的数据中停止数据包递交完成，可以理解为通过MRB接收的数据中停止数据包以及该停止数据包之前的部分或全部数据包递交完成。
通过MRB接收的数据中停止数据包之前的数据包递交完成，可以理解为通过MRB接收的数据中除丢掉的数据包和停止数据包之外的数据包递交完成。应理解，在没有丢包的情况下，可以理解为通过MRB接收的数据中除停止数据包之外的所有数据包递交完成。
在第一停止数据包为通过第一MRB接收(或传输)的数据中的最后一个数据包的情况下，若没有丢包，则通过第一MRB接收的数据中第一停止数据包以及第一停止数据包之前的数据包递交完成，可以理解为通过第一MRB接收的数据递交完成；通过第一MRB接收的数据中第一停止数据包之前的数据包递交完成，可以理解为通过第一MRB接收的数据中除第一停止数据包之外的所有数据包递交完成。在第一停止数据包为包括结束标记的PDCP数据包的情况下，若没有丢包，则通过第一MRB接收的数据中第一停止数据包和/或第一停止数据包之前的数据包递交完成，可以理解为通过第一MRB接收的数据递交完成。
数据包递交完成可以理解为数据包由PDCP层递交到更高层。同理，上面的递交可以理解为由PDCP层向更高层递交。
另一种情况下，第一条件可以为MRB对应的接收窗中第一个未递交数据包的包号大于或等于通过该MRB接收的停止数据包的包号。因此，在第一MRB对应的接收窗中第一个未递交数据包的包号大于或等于第一停止数据包的包号的情况下，可以确定满足第一条件。接收窗中第一个未递交数据包的包号可以通过PDCP接收窗的“RX_DELIV”状态变量指示或定义。
在没有丢包的情况下，MRB对应的接收窗中第一个未递交数据包的包号大于或等于通过该MRB接收的停止数据包的包号，可以理解为通过该MRB接收的数据中停止数据包以及该停止数据包之前的数据包递交完成；MRB对应的接收窗中第一个未递交数据包的包号等于通过该MRB接收的停止数据包的包号，可以理解为通过该MRB接收的数据中停止数据包之前的数据包递交完成。
应理解，在有丢包的情况下，MRB对应的接收窗中第一个未递交数据包的包号大于或等于通过该MRB接收的停止数据包的包号，可以理解为由于混合自动重传请求(hybrid automatic retransmission request，HARQ)重传或RLC重传或PDCP重传一直未成功，在超过一定时间后MRB对应的PDCP接收窗口将跳过MRB数据中丢失的数据包，将第一个未递交数据包的包号设置为大于或等于丢失数据包的包号导致的，MRB对应的PDCP接收窗口的第一个未递交数据包的包号大于或等于停止数据包的包号。当MRB对应的接收窗中第一个未递交数据包的包号大于或等于通过该MRB接收的停止数据包的包号，可以理解为已经处理完通过该MRB接收的停止数据包，即使没有将停止数据包递交到更高层。
应理解，同一MRB业务且通过同一MRB传输的数据可以通过一个接收窗进行接收，第一接入网设备向第一终端设备发送数据的时候，数据包的包号是按照发送顺序依次递增的，即先发送的数据包的包号小于后发送的数据包的包号。第一终端设备通过第一MRB对应的接收窗接收到数据包之后，可以递交接收的数据包，在数据包递交完成之后，可以删除接收窗中的这个数据包。可见，接收窗中对应的数据包为接收但未递交完成的数据包或者即将接收且 未递交完成的数据包。
在又一种情况下，第一条件可以为MRB被释放掉(或被删除掉)。因此，在第一MRB释放掉的情况下，可以确定满足第一条件。MRB被释放掉，可以理解为MRB完成释放，也可以理解为MRB开始释放。MRB被删除掉，可以理解为MRB完成删除，也可以理解为MRB开始删除。
一种示例中，在通过第一MRB接收的数据中第一停止数据包和/或第一停止数据包之前的数据包递交完成的情况下，第一终端设备可以释放掉第一MRB，可以确定满足第一条件。另一种示例中，在第一MRB对应的接收窗中第一个未递交数据包的包号大于或等于第一停止数据包的包号的情况下，第一终端设备可以释放掉第一MRB，可以确定满足第一条件。
在一种情况下，当MRB向高层递交数据时如果一个数据包丢包，可以停止递交此数据包之后的数据包，并且向第一接入网设备发送一个指示信息用于指示数据包丢失，或数据包丢失且已经停止递交之后的数据包。一种实现方式下，此指示信息可以是PDCP状态报告。一种的实现方式下，第一终端设备可以向第一接入网设备上报丢失的数据包的包号，可以是PDCP SDU SN，也可以是GTP-U SN，还可以是PDCP PDU SN。另一种实现的方式下，第一终端设备可以向第一接入网设备上报即将递交的数据包的包号，可以理解的是此数据包号是丢失数据包的包号的下一个包号，可以是PDCP SDU SN，也可以是GTP-U SN，还可以是PDCP PDU SN。另一种实现方式下，第一终端设备可以向第一接入网设备上报已经递交到高层的数据包的包号，可以理解的是此数据包号为丢失的数据包的包号的上一个包号，可以是PDCP SDU SN，也可以是GTP-U SN，还可以是PDCP PDU SN。在此情况下，第一接入网设备可以通过第一DRB或第二接入网可以通过DRB向第一终端设备发送通过第一MRB接收的数据包中未完成递交的第一数据。
对于MRB，在满足第一条件的情况下，MRB可以被释放。MRB释放时，可以停止递交停止数据包之后的数据，可以避免通过第一MRB接收并递交的数据和通过DRB接收并提交的数据重复，可以一定程度上减少在更高层去重复的行为。此处的DRB可以为第一DRB，也可以为第二接入网设备为第一终端设备配置的DRB，还可以为第一DRB，以及第二接入网设备为第一终端设备配置的DRB。
在一种情况下，第一接入网设备可以通过第一DRB向第一终端设备发送第二数据。相应地，第一终端设备可以通过第一DRB接收来自第一接入网设备的第二数据。
一种情况下，第二数据包可以包括通过第一MRB接收但未完成递交的数据。另一种情况下，第一接入网设备可以向第一终端设备发送第三数据，第三数据包括通过第一MRB接收但未完成递交的第一数据。
第二数据可以为第一接入网设备主动向第一终端设备发送的，也可以是第一终端设备先向第一接入网设备发送用于指示通第一DRB发送数据的指示信息，第一接入网设备接收到该指示信息之后，可以根据该指示信息向第一终端设备发送第二数据。此外，该指示信息还可以用于指示通过第一MRB接收的MBS数据中未完成递交的数据包，例如，该指示信息可以包括丢掉的数据包的包号。
由于MRB和DRB是独立编号的，传输的数据也是独立的。因此，为了第一终端设备能够确定第一数据和第二数据属于同一MBS业务，第一接入网设备可以向第一终端设备指示第一MRB与第一DRB之间的对应关系，以便第一终端设备可以该指示信息确定第一MRB与第一DRB之间的对应关系，进而可以根据第一MRB与第一DRB之间的对应关系确定第一数据和第二数据属于同一MBS业务。
第一接入网设备可以通过指示信息向第一终端设备指示第一MRB与第一DRB之间的对应关系。具体地，第一接入网设备可以向第一终端设备发送第三指示信息，第三指示信息用于指示第一MRB与第一DRB之间的对应关系。相应地，第一终端设备接收来自第一接入网设备的第三指示信息。之后在根据第二指示信息确定满足第一条件的情况下，第一终端设备可以根据第一MRB与第一DRB之间的对应关系递交通过第一DRB接收的第二数据。
第三指示信息可以通过专门的信令发送，第三指示信息可以为第一MRB的信息和第一DRB的信息。第一DRB的信息可以为第一DRB的标识，也可以为其他可以唯一标识上述DRB的信息。
第三指示信息也可以通过配置信息发送。该配置信息用于配置第一MRB。例如，可以在对第一MRB进行更新配置的配置信息中携带或包括第一DRB的信息，以指示第一MRB与第一DRB之间的对应关系，比如第一DRB的标识。
第三指示信息还可以通过数据包发送。可以在通过第一MRB接收的数据对应的一个或多个数据包中包括或携带第一DRB的信息，比如第一DRB的标识，以便指示第一MRB与第一DRB之间的对应关系。这一个或多个数据包可以为PDCP数据包，也可以为RLC数据包，还可以为MAC CE数据包。
第一接入网设备也可以复用上面的指示信息向第一终端设备指示第一MRB与第一DRB之间的对应关系。具体地，第一指示信息还可以用于指示第一MRB与第一DRB之间的对应关系。可以是第一指示信息中添加第一MRB的信息，比如第一MRB的标识。
应理解，第三指示信息可以与第一指示信息和第二指示信息通过同一个消息发送，也可以与第一指示信息和/或第二指示信息为同一个指示信息。
在另一种情况下，在根据第二指示信息确定满足第一条件的情况下，第一终端设备可以先向第一接入网设备发送第四指示信息，第四指示信息用于指示满足第一条件。相应地，第一接入网设备接收来自第一终端设备的第四指示信息之后，可以表明第一数据递交完成或第一数据中第一停止数据包之前的数据包递交完成，或者MRB完成释放，可以通过第一DRB向第一终端设备发送第二数据。第一终端设备通过第一DRB接收来自第一接入网设备的第二数据之后，可以直接递交第二数据，不需要等待。
此外，第四指示信息还可以用于指示第一MRB和数据包的包号。例如，第四指示信息可以包括或携带有第一MRB的标识。数据包的包号可以包括通过第一MRB接收的数据中最后一个数据包的包号，或者通过第一MRB接收的数据中递交完成的数据包中包号最大的数据包的包号，或者通过第一MRB接收的数据中未递交完成的数据包的包号最小的数据包的包号。数据包的包号还可以包括丢掉的数据包的包号。
另一种情况下，当MRB在发生丢包时就停止递交数据的情况下，数据包的包号为已经递交的数据包中包号最大的数据包或者为递交的数据包中包号最小的数据包。
为了尽量避免MBS数据的损失，第一终端设备可以在满足第一条件之后再递交通过DRB接收的第二数据。
在一种情况下，为了保证MBS的最小损失切换，协议可以规定：在终端设备由支持MBS的源接入网设备切换到不支持MBS的目标接入网设备的情况下，终端设备可以在满足第一条件的情况下递交通过DRB接收的数据。
第一终端设备可以在接收到第一指示信息和第二指示信息之后，根据第二指示信息确定是否满足第一条件。在一种情况下，第一指示信息可以包括或携带有第一MRB的信息，可以隐式地指示要释放第一MRB，因此，在接收到第一指示信息和第二指示信息之后，可以根据 第二指示信息确定是否满足第一条件。在另一种情况下，在第二指示信息通过MRB释放消息传输的情况下，第二指示信息还可以用于指示释放第一MRB，因此，在接收到第一指示信息和第二指示信息之后，可以根据第二指示信息确定是否满足第一条件。
在另一种情况下，为了保证MBS的最小损失切换，接入网设备可以为终端设备配置配置信息，该配置信息可以用于指示：在终端设备由支持MBS的源接入网设备切换到不支持MBS的目标接入网设备的情况下，终端设备可以在满足第一条件的情况下递交通过DRB接收的数据。
因此，第一接入网设备在确定第一终端设备由支持MBS的第一接入网设备切换到不支持MBS的第二接入网设备的情况下，可以向第一终端设备发送第五指示信息，第五指示信息用于指示通过第一DRB传输的数据在满足第一条件后递交。
相应地，第一终端设备接收来自第一接入网设备的第五指示信息，之后可以根据第五指示信息和第二指示信息确定是否满足第一条件，在确定满足第一条件的情况下，可以递交通过第一DRB接收的第二数据。
第五指示信息和第一指示信息或第二指示信息中其中一个或两个可以是同一个消息或者同一个指示信息。应理解为第五指示信息和第一指示信息为同一条消息，第二指示信息为另一条消息。或者第一指示信息和第二指示信息和第五指示信息为同一条消息。不作为限制。
在第一终端设备递交通过第一DRB接收的第二数据的过程中或之后，第一终端设备可以向第二接入网设备执行单播切换流程。在执行单播切换过程中，第一接入网设备可以向第二接入网设备转发数据，该数据为核心网设备已经发送给第一接入网设备，但第一接入网设备没有通过第一MRB和/或第一DRB发送给第一终端设备的数据，或者第一终端设备没有递交至更高层的数据。
在一种情况下，第一接入网设备可以向核心网设备发送指示信息，用于指示第一接入网设备转发到第二核心网设备的数据包的包号信息。具体的实现方式可以是指示转发的数据包的包号的第一个包号和/或转发的数据包的最后一个数据包包号。具体的数据包包号可以是GTP-U SN。
请参阅图6，图6是本申请实施例公开的一种终端设备由第一接入网设备切换到第二接入网设备的示意图。如图6所示，核心网设备向第一接入网设备发送的MBS数据包括7个GTP-U数据包，这7个GTP-U数据包的包号为1-7。第一接入网设备通过MRB向终端设备发送了包号为1-3的GTP-U数据包。其中，包号为3的GTP-U数据包(即包号为81的PDCP PDU数据包)为当终端设备需要从第一接入网设备切换到第二接入网设备，且第二接入网设备不支持MBS时，发送的停止数据包。MRB对应的PDCP实体对上述的包号为1到3号的GTP-U数据包包分别处理后得到的PDCP PDU数据包的包号分别为79-81。第一接入网设备可以配置一个DRB，以及可以通过这个DRB向终端设备发送包号为4-5的GTP-U数据包，DRB的PDCP实体分别处理后得到的PDCP PDU数据包包号分别为0和1。终端设备接收到PDCP PDU包号为0和1的数据包之后，可以先不向更高层递交数据，在终端设备将通过MRB接收的包号为1-3的GTP-U数据包由PDCP层递交到了更高层或者是PDCP接收窗的第一个未递交的数据包的包号大于或等于81号的情况下，终端设备可以开始向更高层递交通过DRB传输的数据包。比如递交包号为4-5的GTP-U数据包，但是还有包号为6-7的GTP-U数据包第一接入网设备没有发送给终端设备。接着，为了避免丢包，第一接入网设备可以将包号为6-7的GTP-U数据包发送给第二接入网设备，在终端设备由第一接入网设备切换到第二接入网设备之后，第二接入网设备可以将包号为6-7的GTP-U数据包通过DRB发送给第一终端设备，以便可以实现数据的最小损失切换。第一接 入网设备还可以将第一接入网设备向第二接入网设备转发数据的情况上报给核心网设备，比如转发的GTP-U数据包包号为6-7，以便核心网设备可以知道从哪个数据包开始向第二接入网设备发送数据，比如包号为8号的GTP-U数据包。此时，第二接入网设备可以更灵活的发送数据，不受第一接入网设备向第一终端设备发送数据的配置或进度限制。
应理解，上面不同步骤或同一步骤中的不同情况、示例、实现方式可以单独执行，也可以相互组合来执行。
基于上述网络架构，请参阅图7，图7是本申请实施例公开的另一种通信方法的流程示意图。如图7所示，该通信方法可以包括以下步骤。
701.核心网设备向第一接入网设备发送MBS数据。
相应地，第一接入网设备接收来自核心网设备的MBS数据。
第一终端设备接入第一接入网设备之后，若第一终端设备与第一接入网设备之间需要传输MBS数据，则在传输MBS数据之前，核心网设备可以发起MBS session(MBS会话)或者MBS流(flow)建立/修改请求，以便核心网设备和第一接入网设备之间建立用于传输MBS数据的传输通道。之后核心网设备可以通过建立好的传输通道向第一接入网设备发送MBS数据。
此外，第一接入网设备与第一终端设备之间可以建立第一MRB，以便第一接入网设备与第一终端设备之间可以通过第一MRB传输MBS数据。
702.第一接入网设备通过第一MRB向第一终端设备发送第一数据。
相应地，第一终端设备通过第一MRB接收来自第一接入网设备的第一数据。
其中，步骤701的详细描述可以参考步骤501的描述。
应理解，第一数据为上述MBS数据中的部分数据。
703.第一终端设备向第一接入网设备发送测量报告。
相应地，第一接入网设备接收来自第一终端设备的测量报告。
需要指出的是，由于在本申请实施例中，第一接入网设备在触发第一终端设备进行小区切换之前，需要先指示第一终端设备建立第一DRB，并通过第一DRB传输MBS数据。因此，第一终端设备进行小区切换需要的时间将会增加。为了避免第一终端设备进行小区切换的时间过长导致第一终端设备切换失败或者业务中断时间较长，本申请还提供了一种能够触发第一终端设备提前上报测量报告的方法，以使得第一终端设备有足够的时间进行小区切换。
第一终端设备可以通过新的测量事件触发并上报测量报告。新的测量事件用于使第一终端设备提前触发并上报测量报告。
一种示例，新的测量事件可以包括以下一种或多种：
E1：服务小区测量结果高于门限b 1。
E2：服务小区测量结果低于门限b 2。
E3：邻区测量结果+c高于服务小区测量结果+偏移值(offset)。
E4：邻区测量结果高于门限b 3。
E5：服务小区测量结果低于门限b 4，并且邻区测量结果高于门限b 5。
E6：邻区测量结果+d高于Scell的测量结果+偏移值(offset)。
F1：异系统小区测量结果高于门限b 6。
F2：异系统小区测量结果高于门限b 7，SPcell测量结果低于门限b8。
其中，a 1大于b 1，a 2小于b 2，a 3大于b 3，a 4小于b 4，a 5大于b 5，a 6大于b 6，a 7大于b 7， a 8小于b 8，c和d均大于0。
基于上述新的测量事件，第一终端设备可以提前触发并上报测量报告，使得第一终端设备有足够的时间建立第一DRB，并进行小区切换，降低了第一终端设备切换失败的概率或业务中断的时长。
引入新的测量事件是可选的，第一终端设备也可以基于现有的为切换配置的测量事件触发并上报测量报告，而第一接入网设备可以基于现有的测量机制以及目标接入网设备是否支持MBS，来判断是否先配置第一DRB再执行切换。
704.第一接入网设备根据测量报告确定第二接入网设备。
705.第一接入网设备判断第二接入网设备是否支持MBS，在判断出第二接入网设备不支持MBS，执行下面的步骤。
其中，步骤705的描述可以参考步骤502中的相关描述。
706.第一接入网设备向第一终端设备发送第一指示信息。
相应地，第一终端设备接收来自第一接入网设备的第一指示信息。
其中，步骤706的详细描述可以参考步骤502的描述。
707.第一接入网设备向第一终端设备发送第二指示信息。
相应地，第一终端设备接收来自第一接入网设备的第二指示信息。
其中，步骤707的详细描述可以参考步骤503的描述。
708.第一接入网设备通过第一DRB向第一终端设备发送第二数据。
相应地，第一终端设备通过第一DRB接收来自第一接入网设备的第二数据。
其中，步骤708的详细描述可以参考步骤504下面的相关描述。
709.第一终端设备在根据第二指示信息确定满足第一条件的情况下，递交通过第一DRB接收的第二数据。
其中，步骤709的详细描述可以参考步骤504的描述。
应理解，步骤706和步骤707可以并行执行，也可以串行执行。
应理解，步骤705也可以在步骤706、步骤707或步骤708后，且步骤709之前执行。
基于上述网络架构，请参阅图8，图8是本申请实施例公开的又一种通信方法的流程示意图。如图8所示，该通信方法可以包括以下步骤。
801.核心网设备向第一接入网设备发送MBS数据。
相应地，第一接入网设备接收来自核心网设备的MBS数据。
其中，步骤801的详细描述可以参考步骤701的描述。
802.第一接入网设备通过第一MRB向第一终端设备发送第一数据。
相应地，第一终端设备通过第一MRB接收来自第一接入网设备的第一数据。
其中，步骤802的详细描述可以参考步骤501的描述。
803.第一终端设备向第一接入网设备发送测量报告。
相应地，第一接入网设备接收来自第一终端设备的测量报告。
其中，步骤803的详细描述可以参考步骤703的描述。
804.第一接入网设备根据测量报告确定第二接入网设备。
805.第一接入网设备判断第二接入网设备是否支持MBS，在判断出第二接入网设备不支持MBS，执行下面的步骤。
其中，步骤805的描述可以参考步骤502中的相关描述。
806.第一接入网设备向第一终端设备发送第一指示信息。
相应地，第一终端设备接收来自第一接入网设备的第一指示信息。
其中，步骤806的详细描述可以参考步骤502的描述。
807.第一接入网设备向第一终端设备发送第二指示信息。
相应地，第一终端设备接收来自第一接入网设备的第二指示信息。
其中，步骤807的详细描述可以参考步骤503的描述。
808.在根据第二指示信息确定满足第一条件的情况下，第一终端设备向第一接入网设备发送第四指示信息。
相应地，第一接入网设备接收来自第一终端设备的第四指示信息。
809.第一接入网设备通过第一DRB向第一终端设备发送第二数据。
相应地，第一终端设备通过第一DRB接收来自第一接入网设备的第二数据。
其中，步808-步骤809的详细描述可以参考步骤504下面的相关描述。
810.第一终端设备递交通过第一DRB接收的第二数据。
其中，步骤810的详细描述可以参考步骤504的描述。
应理解，步骤806和步骤807可以并行执行，也可以串行执行。
应理解，步骤805也可以在步骤806或步骤807后，且步骤808之前执行。
应理解，上述通信方法中由第一终端设备执行的功能也可以由第一终端设备中的模块(例如，芯片)来执行，上述通信方法中由第一接入网设备执行的功能也可以由第一接入网设备中的模块(例如，芯片)来执行，上述通信方法中由第二接入网设备执行的功能也可以由第二接入网设备中的模块(例如，芯片)来执行。
基于上述网络架构，请参阅图9，图9是本申请实施例公开的一种通信装置的结构示意图。如图9所示，该通信装置可以包括：
发送单元901，用于通过第一MRB向第一终端设备发送第一数据，第一数据为MBS数据；
发送单元901，还用于向第一终端设备发送第一指示信息，第一指示信息用于指示第一DRB；
发送单元901，还用于向第一终端设备发送第二指示信息，第二指示信息用于指示第一停止数据包，第一停止数据包通过第一MRB发送。
在一个实施例中，发送单元901向第一终端设备发送第一指示信息包括：
在第一终端设备由第一接入网设备切换至第二接入网设备，且第二接入网设备不支持MBS的情况下，向第一终端设备发送第一指示信息；
发送单元901向第一终端设备发送第二指示信息包括：
在第一终端设备由第一接入网设备切换至第二接入网设备，且第二接入网设备不支持MBS的情况下，向第一终端设备发送第二指示信息。
在一个实施例中，发送单元901，还用于通过第一DRB向第一终端设备发送第二数据，第一数据和第二数据属于同一MBS业务，第一MRB与第一DRB之间存在对应关系。
在一个实施例中，发送单元901，还用于向第一终端设备发送第三指示信息，第三指示信息用于该对应关系。
在一个实施例中，该通信装置还可以包括：
接收单元902，用于接收来自第一终端设备的第四指示信息，第四指示信息用于指示满足 第一条件；
发送单元901，还用于通过第一DRB向第一终端设备发送第二数据，第一数据和第二数据属于同一MBS业务。
在一个实施例中，发送单元901，还用于向第一终端设备发送第五指示信息，第五指示信息用于指示通过第一DRB传输的数据在满足第一条件后递交。
在一个实施例中，第一指示信息还用于指示该对应关系。
在一个实施例中，第一条件可以为：
通过MRB接收的数据中停止数据包和/或该停止数据包之前的数据包递交完成；或者
MRB对应的接收窗中第一个未递交数据包的包号大于或等于通过该MRB接收的停止数据包的包号；或者
MRB被释放掉。
有关上述发送单元901和接收单元902更详细的描述可以直接参考上述图5、图7、图8所示的方法实施例中第一接入网设备的相关描述直接得到，这里不加赘述。
基于上述网络架构，请参阅图10，图10是本申请实施例公开的另一种通信装置的结构示意图。如图10所示，该通信装置可以包括：
接收单元1001，用于通过第一MRB接收来自第一接入网设备的第一数据，第一数据为MBS数据；
接收单元1001，还用于接收来自第一接入网设备的第一指示信息，第一指示信息用于指示第一DRB；
接收单元1001，还用于接收来自第一接入网设备的第二指示信息，第二指示信息用于指示第一停止数据包，第一停止数据包通过第一MRB接收；
递交单元1002，用于在根据第二指示信息确定满足第一条件的情况下，递交通过第一DRB接收的第二数据，第一数据和第二数据属于同一MBS业务。
在一个实施例中，递交单元1002，具体用于在第一终端设备由第一接入网设备切换至第二接入网设备，第二接入网设备不支持MBS，且根据第二指示信息确定满足第一条件的情况下，递交通过第一DRB接收的第二数据。
在一个实施例中，接收单元1001，还用于通过第一DRB接收来自第一接入网设备的第二数据，第一MRB与第一DRB之间存在对应关系；
递交单元1002递交通过第一DRB接收的第二数据包括：
根据该对应关系递交通过第一DRB接收的第二数据。
在一个实施例中，接收单元1001，还用于接收来自第一接入网设备的第三指示信息，第三指示信息用于指示该对应关系。
在一个实施例中，递交单元1002递交通过第一DRB接收的第二数据包括：
向第一接入网设备发送第四指示信息，第四指示信息用于指示满足第一条件；
通过第一DRB接收来自第一接入网设备的第二数据；
递交第二数据。
在一个实施例中，接收单元1001，还用于接收来自第一接入网设备的第五指示信息，第五指示信息用于指示通过第一DRB传输的数据在满足第一条件后递交；
递交单元1002，具体用于根据第五指示信息，在根据第二指示信息确定满足第一条件的情况下，递交通过第一DRB接收的第二数据。
在一个实施例中，第一指示信息还用于指示该对应关系。
在一个实施例中，第一条件可以为：
通过MRB接收的数据中停止数据包和/或该停止数据包之前的数据包递交完成；或者
MRB对应的接收窗中第一个未递交数据包的包号大于或等于通过该MRB接收的停止数据包的包号；或者
MRB被释放掉。
有关上述接收单元1001和递交单元1002详细的描述可以直接参考上述图5、图7、图8所示的方法实施例中第一终端设备的相关描述直接得到，这里不加赘述。
应理解，上述各个单元可以是独立的，也可以是集成在一起的。例如，接收单元和单元可以是独立的，也可以集成为收发单元。
基于上述网络架构，请参阅图11，图11是本申请实施例公开的又一种通信装置的结构示意图。如图11所示，该通信装置可以包括处理器1101、存储器1102、收发器1103和总线1104。存储器1102可以是独立存在的，可以通过总线1104与处理器1101相连接。存储器1102也可以和处理器1101集成在一起。其中，总线1104用于实现这些组件之间的连接。在一种情况下，如图11所示，收发器1103可以包括发射机11031、接收机11032和天线11033。在另一种情况下，收发器1103可以包括发射器(即输出接口)和接收器(即输入接口)。发射器可以包括发射机和天线，接收器可以包括接收机和天线。
该通信装置可以为第一接入网设备，也可以为第一接入网设备中的模块。存储器1102中存储的计算机程序指令被执行时，该处理器1101用于控制发送单元901和接收单元902执行上述实施例中执行的操作，收发器1103用于执行上述实施例中发送单元901和接收单元902执行的操作。上述通信装置还可以用于执行上述图5、图7、图8方法实施例中第一接入网设备执行的各种方法，不再赘述。
该通信装置可以为第一终端设备，也可以为第一终端设备中的模块。存储器1102中存储的计算机程序指令被执行时，该处理器1101用于控制接收单元1001执行上述实施例中执行的操作，该处理器1101还用于执行上述实施例中递交单元1002执行的操作，收发器1103用于执行上述实施例中接收单元1001执行的操作。上述通信装置还可以用于执行上述图5、图7、图8方法实施例中第一终端设备执行的各种方法，不再赘述。
基于上述网络架构，请参阅图12，图12是本申请实施例公开的又一种通信装置的结构示意图。如图12所示，该通信装置可以包括输入接口1201、逻辑电路1202和输出接口1203。输入接口1201与输出接口1203通过逻辑电路1202相连接。其中，输入接口1201用于接收来自其它通信装置的信息，输出接口1203用于向其它通信装置输出、调度或者发送信息。逻辑电路1202用于执行除输入接口1201与输出接口1203的操作之外的操作，例如实现上述实施例中处理器1101实现的功能。其中，该通信装置可以为终端设备(或终端设备内的模块)，也可以为接入网设备(或接入网设备内的模块)。其中，有关输入接口1201、逻辑电路1202和输出接口1203更详细的描述可以直接参考上述方法实施例中终端设备或接入网设备的相关描述直接得到，这里不加赘述。
应理解，上述各个模块可以是独立的，也可以集成在一起的。例如，发射机、接收机和 天线可以是独立的，也可以集成为收发器。再例如，输入接口与输出接口可以是独立的，也可以集成为通信接口。
本申请实施例还公开一种计算机可读存储介质，其上存储有指令，该指令被执行时执行上述方法实施例中的方法。
本申请实施例还公开一种包括计算机指令的计算机程序产品，该计算机指令被执行时执行上述方法实施例中的方法。
本申请实施例还公开一种通信系统，该通信系统可以包括集中控制器、路由计算器和路由执行器，具体描述可以参考上述所示的通信方法。
以上所述的具体实施方式，对本申请的目的、技术方案和有益效果进行了进一步详细说明，所应理解的是，以上所述仅为本申请的具体实施方式而已，并不用于限定本申请的保护范围，凡在本申请的技术方案的基础之上，所做的任何修改、等同替换、改进等，均应包括在本申请的保护范围之内。

Claims (30)

  1. 一种通信方法，其特征在于，包括：
    通过第一多播广播业务无线承载MRB向第一终端设备发送第一数据，所述第一数据为多播广播业务MBS数据；
    向所述第一终端设备发送第一指示信息，所述第一指示信息用于指示第一数据无线承载DRB；
    向所述第一终端设备发送第二指示信息，所述第二指示信息用于指示第一停止数据包，所述第一停止数据包通过所述第一MRB发送。
  2. 根据权利要求1所述的方法，其特征在于，所述向所述第一终端设备发送第一指示信息包括：
    在所述第一终端设备由第一接入网设备切换至第二接入网设备，且所述第二接入网设备不支持MBS的情况下，向所述第一终端设备发送第一指示信息；
    所述向所述第一终端设备发送第二指示信息包括：
    在所述第一终端设备由所述第一接入网设备切换至所述第二接入网设备，且所述第二接入网设备不支持MBS的情况下，向所述第一终端设备发送第二指示信息。
  3. 根据权利要求1或2所述的方法，其特征在于，所述方法还包括：
    通过所述第一DRB向所述第一终端设备发送第二数据，所述第一数据和所述第二数据属于同一MBS业务，所述第一MRB与所述第一DRB之间存在对应关系。
  4. 根据权利要求3所述的方法，其特征在于，所述方法还包括：
    向所述第一终端设备发送第三指示信息，所述第三指示信息用于所述对应关系。
  5. 根据权利要求1或2所述的方法，其特征在于，所述方法还包括：
    接收来自所述第一终端设备的第四指示信息，所述第四指示信息用于指示满足第一条件；
    通过所述第一DRB向所述第一终端设备发送第二数据，所述第一数据和所述第二数据属于同一MBS业务。
  6. 根据权利要求1-5所述的方法，其特征在于，所述方法还包括：
    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通过所述第一DRB传输的数据在满足第一条件后递交。
  7. 一种通信方法，其特征在于，包括：
    通过第一多播广播业务无线承载MRB接收来自第一接入网设备的第一数据，所述第一数据为多播广播业务MBS数据；
    接收来自所述第一接入网设备的第一指示信息，所述第一指示信息用于指示第一数据无线承载DRB；
    接收来自所述第一接入网设备的第二指示信息，所述第二指示信息用于指示第一停止数据包，所述第一停止数据包通过所述第一MRB接收；
    在根据所述第二指示信息确定满足第一条件的情况下，递交通过所述第一DRB接收的第二数据，所述第一数据和所述第二数据属于同一MBS业务。
  8. 根据权利要求7所述的方法，其特征在于，所述在根据所述第二指示信息确定满足第一条件的情况下，递交通过所述第一DRB接收的第二数据包括：
    在第一终端设备由所述第一接入网设备切换至第二接入网设备，所述第二接入网设备不 支持MBS，且根据所述第二指示信息确定满足第一条件的情况下，递交通过所述第一DRB接收的第二数据。
  9. 根据权利要求7或8所述的方法，其特征在于，所述方法还包括：
    通过所述第一DRB接收来自所述第一接入网设备的所述第二数据，所述第一MRB与所述第一DRB之间存在对应关系；
    所述递交通过所述第一DRB接收的第二数据包括：
    根据所述对应关系递交通过所述第一DRB接收的第二数据。
  10. 根据权利要求9所述的方法，其特征在于，所述方法还包括：
    接收来自所述第一接入网设备的第三指示信息，所述第三指示信息用于指示所述对应关系。
  11. 根据权利要求7或8所述的方法，其特征在于，所述递交通过所述第一DRB接收的第二数据包括：
    向所述第一接入网设备发送第四指示信息，所述第四指示信息用于指示满足第一条件；
    通过所述第一DRB接收来自所述第一接入网设备的第二数据；
    递交所述第二数据。
  12. 根据权利要求7所述的方法，其特征在于，所述方法还包括：
    接收来自所述第一接入网设备的第五指示信息，所述第五指示信息用于指示通过所述第一DRB传输的数据在满足第一条件后递交；
    所述在根据所述第二指示信息确定满足第一条件的情况下，递交通过所述第一DRB接收的第二数据包括：
    根据所述第五指示信息，在根据所述第二指示信息确定满足第一条件的情况下，递交通过所述第一DRB接收的第二数据。
  13. 一种通信装置，其特征在于，包括：
    发送单元，用于通过第一多播广播业务无线承载MRB向第一终端设备发送第一数据，所述第一数据为多播广播业务MBS数据；
    所述发送单元，还用于向所述第一终端设备发送第一指示信息，所述第一指示信息用于指示第一数据无线承载DRB；
    所述发送单元，还用于向所述第一终端设备发送第二指示信息，所述第二指示信息用于指示第一停止数据包，所述第一停止数据包通过所述第一MRB发送。
  14. 根据权利要求13所述的装置，其特征在于，所述发送单元向所述第一终端设备发送第一指示信息包括：
    在所述第一终端设备由第一接入网设备切换至第二接入网设备，且所述第二接入网设备不支持MBS的情况下，向所述第一终端设备发送第一指示信息；
    所述发送单元向所述第一终端设备发送第二指示信息包括：
    在所述第一终端设备由所述第一接入网设备切换至所述第二接入网设备，且所述第二接入网设备不支持MBS的情况下，向所述第一终端设备发送第二指示信息。
  15. 根据权利要求13或14所述的装置，其特征在于，所述发送单元，还用于通过所述第一DRB向所述第一终端设备发送第二数据，所述第一数据和所述第二数据属于同一MBS业务，所述第一MRB与所述第一DRB之间存在对应关系。
  16. 根据权利要求15所述的装置，其特征在于，所述发送单元，还用于向所述第一终端 设备发送第三指示信息，所述第三指示信息用于所述对应关系。
  17. 根据权利要求13或14所述的装置，其特征在于，所述装置还包括：
    接收单元，用于接收来自所述第一终端设备的第四指示信息，所述第四指示信息用于指示满足第一条件；
    所述发送单元，还用于通过所述第一DRB向所述第一终端设备发送第二数据，所述第一数据和所述第二数据属于同一MBS业务。
  18. 根据权利要求13-17所述的装置，其特征在于，所述发送单元，还用于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通过所述第一DRB传输的数据在满足第一条件后递交。
  19. 一种通信装置，其特征在于，包括：
    接收单元，用于通过第一多播广播业务无线承载MRB接收来自第一接入网设备的第一数据，所述第一数据为多播广播业务MBS数据；
    所述接收单元，还用于接收来自所述第一接入网设备的第一指示信息，所述第一指示信息用于指示第一数据无线承载DRB；
    所述接收单元，还用于接收来自所述第一接入网设备的第二指示信息，所述第二指示信息用于指示第一停止数据包，所述第一停止数据包通过所述第一MRB接收；
    递交单元，用于在根据所述第二指示信息确定满足第一条件的情况下，递交通过所述第一DRB接收的第二数据，所述第一数据和所述第二数据属于同一MBS业务。
  20. 根据权利要求19所述的装置，其特征在于，所述递交单元，具体用于在第一终端设备由所述第一接入网设备切换至第二接入网设备，所述第二接入网设备不支持MBS，且根据所述第二指示信息确定满足第一条件的情况下，递交通过所述第一DRB接收的第二数据。
  21. 根据权利要求19或20所述的装置，其特征在于，所述接收单元，还用于通过所述第一DRB接收来自所述第一接入网设备的所述第二数据，所述第一MRB与所述第一DRB之间存在对应关系；
    所述递交单元递交通过所述第一DRB接收的第二数据包括：
    根据所述对应关系递交通过所述第一DRB接收的第二数据。
  22. 根据权利要求21所述的装置，其特征在于，所述接收单元，还用于接收来自所述第一接入网设备的第三指示信息，所述第三指示信息用于指示所述对应关系。
  23. 根据权利要求19或20所述的装置，其特征在于，所述递交单元递交通过所述第一DRB接收的第二数据包括：
    向所述第一接入网设备发送第四指示信息，所述第四指示信息用于指示满足第一条件；
    通过所述第一DRB接收来自所述第一接入网设备的第二数据；
    递交所述第二数据。
  24. 根据权利要求19所述的装置，其特征在于，所述接收单元，还用于接收来自所述第一接入网设备的第五指示信息，所述第五指示信息用于指示通过所述第一DRB传输的数据在满足第一条件后递交；
    所述递交单元，具体用于根据所述第五指示信息，在根据所述第二指示信息确定满足第一条件的情况下，递交通过所述第一DRB接收的第二数据。
  25. 根据权利要求3或9所述的方法，或者15或21所述的装置，其特征在于，所述第一指示信息还用于指示所述对应关系。
  26. 根据权利要求5-12任一项所述的方法，或者17-24任一项所述的装置，其特征在于，所述第一条件为：
    通过MRB接收的数据中停止数据包和/或所述停止数据包之前的数据包递交完成；或者
    MRB对应的接收窗中第一个未递交数据包的包号大于或等于所述MRB接收的停止数据包的包号；或者
    MRB被释放掉。
  27. 一种通信装置，其特征在于，包括处理器、存储器，所述处理器和存储器耦合，所述处理器调用所述存储器中存储的计算机程序实现如权利要求1-12、25-26任一项所述的方法。
  28. 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程序或计算机指令，当所述计算机程序或计算机指令被运行时，实现如权利要求1-12、25-26任一项所述的方法。
  29. 一种计算机程序产品，其特征在于，所述计算机程序产品包括计算机程序代码，当所述计算机程序代码被运行时，实现如权利要求1-12、25-26任一项所述的方法。
  30. 一种芯片，其特征在于，包括处理器，用于执行存储器中存储的程序，当所述程序被执行时，使得所述芯片执行如权利要求1-12、25-26任一项所述的方法。
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WO2021168257A1 (en) * 2020-02-21 2021-08-26 Qualcomm Incorporated Multicast service handover and data forwarding
WO2021164400A1 (zh) * 2020-02-17 2021-08-26 大唐移动通信设备有限公司 数据流传输方法、终端和网络侧设备
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