WO2022151294A1 - 通信方法及装置 - Google Patents

通信方法及装置 Download PDF

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Publication number
WO2022151294A1
WO2022151294A1 PCT/CN2021/071952 CN2021071952W WO2022151294A1 WO 2022151294 A1 WO2022151294 A1 WO 2022151294A1 CN 2021071952 W CN2021071952 W CN 2021071952W WO 2022151294 A1 WO2022151294 A1 WO 2022151294A1
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WO
WIPO (PCT)
Prior art keywords
radio bearer
access network
network device
mbs
terminal device
Prior art date
Application number
PCT/CN2021/071952
Other languages
English (en)
French (fr)
Inventor
许斌
李秉肇
曹振臻
王燕
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP21918502.2A priority Critical patent/EP4277348A4/en
Priority to KR1020237027493A priority patent/KR20230131252A/ko
Priority to PCT/CN2021/071952 priority patent/WO2022151294A1/zh
Priority to JP2023542660A priority patent/JP2024503681A/ja
Priority to BR112023014238A priority patent/BR112023014238A2/pt
Priority to CN202180089891.0A priority patent/CN116783962A/zh
Publication of WO2022151294A1 publication Critical patent/WO2022151294A1/zh
Priority to US18/351,563 priority patent/US20230362596A1/en

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Classifications

    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0007—Control or signalling for completing the hand-off for multicast or broadcast services, e.g. MBMS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/15—Flow control; Congestion control in relation to multipoint traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/20—Support for services
    • H04L49/201—Multicast operation; Broadcast operation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0268—Traffic management, e.g. flow control or congestion control using specific QoS parameters for wireless networks, e.g. QoS class identifier [QCI] or guaranteed bit rate [GBR]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • H04W36/0044—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information of quality context information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/40—Connection management for selective distribution or broadcast

Definitions

  • the present application relates to the field of communication technologies, and in particular, to a communication method and device.
  • Multicast broadcast service (multicast and broadcast service, MBS) is a service transmitted by access network equipment to multiple terminal equipment.
  • MBS includes live broadcast service, public safety service, and batch software update service.
  • the MBS is sequentially transmitted to the terminal device through the MBS server, the core network device, and the access network device.
  • the MBS is transmitted between the MBS server and the core network device through a public transmission channel (MBS service).
  • MBS is 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).
  • the MBS is transmitted between the access network equipment and the terminal equipment through the MBS radio bearer (MBS radio bearer, MRB).
  • MBS usually has two transmission modes, namely point-to-multi-point (PTM) transmission and point-to-point (PTP) transmission.
  • PTM point-to-multi-point
  • PTP point-to-point
  • the terminal equipment needs to switch from one cell to another cell as the signal strength of each cell changes during the movement of the terminal equipment.
  • the target base station does not support the multicast broadcast transmission mode.
  • the MBS cannot continue to receive through multicast broadcasting, and thus the service continuity of the MBS during the handover process of the terminal device cannot be guaranteed.
  • the present application provides a communication method and device, which solves the problem that the service continuity of MBS cannot be guaranteed when a terminal device switches from a cell that supports multicast broadcast transmission to a cell that does not support multicast broadcast transmission in the prior art .
  • a first aspect provides a communication method, comprising: a terminal device receiving first indication information, where the first indication information is used to instruct the terminal device to configure a first radio bearer as a second radio bearer; the first radio bearer is a multicast radio bearer , the second radio bearer is a unicast radio bearer.
  • the terminal device receives the MBS through the second radio bearer.
  • the first access network device when the terminal device needs to be switched from the first access network device that supports the multicast broadcast transmission mode to the second access network device that does not support the multicast broadcast transmission mode, the first access network device will The first radio bearer currently used to carry the MBS between the first access network device and the terminal device is configured as the second radio bearer used to carry the unicast service. The first access network device sends the MBS to the terminal device in the form of unicast through the second radio bearer.
  • the MBS 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 can directly switch the MBS being transmitted to the second access network device according to the current mode of switching the unicast service.
  • the problem of MBS terminals caused by the fact that the second access network device does not support the multicast broadcast transmission mode is solved.
  • the first indication information is specifically used to indicate at least one of the following information of the second radio bearer: packet data convergence protocol (packet data convergence protocol, PDCP) configuration information, Radio link control (radio link control, RLC) configuration information, security configuration information, and the identifier of the second radio bearer.
  • packet data convergence protocol packet data convergence protocol
  • RLC Radio link control
  • the terminal device can determine the configuration information of the second radio bearer according to the first indication information, so that the terminal device can configure the second radio bearer according to the configuration information.
  • the second radio bearer uses at least one of the following configuration information of the first radio bearer: PDCP configuration information, PTP RLC configuration information.
  • the second radio bearer uses the PDCP configuration information and/or the PTP RLC configuration information of the first radio bearer, so that the terminal device does not need to reconfigure the PDCP configuration and the RLC configuration when configuring the second radio bearer, reducing the need for the terminal device to realize complexity.
  • the PDCP entity corresponding to the second radio bearer uses the transmission state and transmission parameters of the transmission window of the PDCP entity corresponding to the first radio bearer.
  • a communication method including: a first access network device sending first indication information, where the first indication information is used to instruct a terminal device to configure a first radio bearer as a second radio bearer; the first radio bearer is Multicast radio bearer, the second radio bearer is a unicast radio bearer.
  • the first access network device sends the MBS through the second radio bearer.
  • the first indication information is specifically used to indicate at least one of the following information of the second radio bearer: PDCP configuration information, RLC configuration information, security configuration information, and second radio bearer information The identity of the bearer.
  • the second radio bearer uses at least one of the following configuration information of the first radio bearer: PDCP configuration information, PTP RLC configuration information.
  • the PDCP entity corresponding to the second radio bearer uses the transmission state and transmission parameters of the transmission window of the PDCP entity corresponding to the first radio bearer.
  • the method further includes: the first access network device sends second indication information, where the second indication information is used to instruct the core network device to use the unicast corresponding to the terminal device
  • the session or unicast quality of service flow sends MBS to the first access network device.
  • the MBS is transmitted in the form of unicast between the first access network device and the terminal device
  • the MBS is also transmitted in the form of unicast between the first access network device and the core network device, which can increase the number of core network devices.
  • network equipment the consistency of MBS transmission between the first access network equipment and the terminal equipment.
  • the second indication information is also used to indicate the data packet sequence number, and the data packet sequence number is the MBS sent by the core network device through the unicast session or the unicast quality of service flow.
  • the sequence number of the first packet is the MBS sent by the core network device through the unicast session or the unicast quality of service flow.
  • the first access network device can instruct the core network from which data packet the sequence number of the data packet starts using the MBS sent by the unicast session or the unicast quality of service flow.
  • a communication method including: a first access network device receiving third indication information; and the third indication information is used to indicate an association relationship between a unicast quality of service flow and an MBS quality of service flow.
  • the first access network device maps the MBS QoS flow to the unicast QoS flow according to the third indication information.
  • the first access network device forwards the unicast quality of service flow.
  • the first access network device and the terminal device maintain a multicast transmission of MBS.
  • the access network device instructs the terminal device to transmit the MBS with the second access network in the form of unicast.
  • the MBS is transmitted between the terminal device and the second access network device in the form of unicast.
  • the first access network device sends the unsent MBS to the second access network device in the form of unicast.
  • the MBS is transmitted in the form of unicast.
  • the method ensures that after the terminal device is switched to the second access network device, the MBS can still be transmitted correctly.
  • the handover process is similar to the existing handover process, which is easy to implement and can ensure the continuity of the terminal equipment receiving MBS.
  • the third indication information includes at least one of the following: the flow identifier of the unicast QoS flow corresponding to the MBS QoS flow, and the QoS parameter of the unicast QoS flow.
  • the access network device may determine the unicast QoS flow corresponding to the MBS QoS flow and parameter information of the unicast QoS flow according to the third indication information.
  • a communication method comprising: a terminal device receiving fourth indication information, where the fourth indication information is used to instruct the terminal device to configure a second radio bearer as a first radio bearer; the first radio bearer is a multicast radio bearer , the second radio bearer is a unicast radio bearer.
  • the terminal device receives the MBS through the first radio bearer.
  • an embodiment of the present application provides a communication method.
  • a terminal device is switched from an access network device that does not support multicast broadcast transmission to an access network device that supports multicast broadcast transmission, if When the MBS is transmitted between the terminal equipment and the access network equipment in the form of unicast, the MBS is mapped to the MBS transmitted by the multicast. The problem of wasting transmission resources caused by repeated transmission of MBS is solved.
  • the method further includes: the terminal device delivering the data packet in the PDCP entity corresponding to the first radio bearer to the high-level protocol entity.
  • the terminal device can deliver the data packets in the PDCP entity to the higher-layer protocol entity before reconfiguration, so as to avoid data loss in the PDCP entity during the process of reconfiguring the PDCP entity.
  • the method further includes: the terminal device performs at least one of the following operations to configure the second radio bearer as the first radio bearer: establishing a PTM RLC entity, configuring an MBS identifier, Delete the security configuration in the second radio bearer configuration.
  • the terminal device can obtain the first radio bearer by configuring the PTP RLC entity in the second radio bearer, and/or configuring the MBS network identifier, and/or deleting the security configuration in the second radio bearer configuration.
  • the method further includes: the terminal device sends fifth indication information to the third access network device, where the fifth indication information is used to indicate the data that the terminal device has not successfully received The serial number corresponding to the package.
  • the third access network device may determine, according to the sequence numbers corresponding to the unsuccessfully received data packets, the data packets that need to be sent to the terminal device after the radio bearer is reconfigured.
  • a communication device including: a communication unit and a processing unit.
  • the processing unit is used to instruct the communication unit to receive the first indication information, and the first indication information is used to instruct the terminal device to configure the first radio bearer as the second radio bearer; the first radio bearer is a multicast radio bearer, and the second radio bearer is Unicast radio bearer.
  • the processing unit is further configured to instruct the communication unit to receive the MBS through the second radio bearer.
  • the first indication information is specifically used to indicate at least one of the following information of the second radio bearer: PDCP configuration information, RLC configuration information, security configuration information, and second radio bearer information The identity of the bearer.
  • the second radio bearer uses at least one of the following configuration information of the first radio bearer: PDCP configuration information, point-to-point PTP RLC configuration information.
  • the PDCP entity corresponding to the second radio bearer uses the transmission state and transmission parameters of the transmission window of the PDCP entity corresponding to the first radio bearer.
  • a communication apparatus comprising: a communication unit and a processing unit.
  • the processing unit is used to instruct the communication unit to send first indication information, where the first indication information is used to instruct the terminal device to configure the first radio bearer as the second radio bearer; the first radio bearer is a multicast radio bearer, and the second radio bearer is Unicast radio bearer.
  • the processing unit is further configured to instruct the communication unit to send the MBS through the second radio bearer.
  • the first indication information is specifically used to indicate at least one of the following information of the second radio bearer: PDCP configuration information, RLC configuration information, security configuration information, and second radio bearer information The identity of the bearer.
  • the second radio bearer uses at least one of the following configuration information of the first radio bearer: PDCP configuration information, PTP RLC configuration information.
  • the PDCP entity corresponding to the second radio bearer uses the transmission state and transmission parameters of the transmission window of the PDCP entity corresponding to the first radio bearer.
  • the processing unit is further configured to instruct the communication unit to send second indication information, and the second indication information is used to instruct the core network device to use the unicast session corresponding to the terminal device or The unicast quality of service flow sends MBS to the first access network device.
  • the second indication information is further used to indicate the sequence number of the data packet, and the sequence number of the data packet is the MBS sent by the core network device through the unicast session or the unicast quality of service stream.
  • the sequence number of the first packet is the MBS sent by the core network device through the unicast session or the unicast quality of service stream.
  • a communication device comprising: a communication unit and a processing unit.
  • the processing unit is configured to instruct the communication unit to receive third indication information; the third indication information is used to indicate the association relationship between the unicast QoS flow and the MBS QoS flow.
  • the processing unit is further configured to map the MBS QoS flow to the unicast QoS flow according to the third indication information during the handover process.
  • the processing unit is further configured to instruct the communication unit to forward the unicast QoS stream.
  • the third indication information includes at least one of the following: the flow identifier of the unicast QoS flow corresponding to the MBS QoS flow, and the QoS parameter of the unicast QoS flow.
  • a communication device comprising: a communication unit and a processing unit.
  • the processing unit is used to instruct the communication unit to receive fourth indication information, and the fourth indication information is used to instruct the terminal device to configure the second radio bearer as the first radio bearer; the first radio bearer is a multicast radio bearer, and the second radio bearer is Unicast radio bearer.
  • the processing unit is further configured to instruct the communication unit to receive the MBS through the first radio bearer.
  • the processing unit is further configured to:
  • the data packet in the PDCP entity corresponding to the first radio bearer is delivered to the high-level protocol entity.
  • the present application provides a communication device, comprising: a processor and a storage medium; at least one processor and an interface circuit, where the interface circuit is configured to receive signals from other communication devices other than the communication device and transmit to the processor Or send the signal from the processor to other communication devices than the communication device, and the processor is used to implement the first aspect and any one of the possible implementations of the first aspect through logic circuits or executing code instructions.
  • the communication device may be a terminal device or a chip in the terminal device.
  • the present application provides a communication device, comprising: a processor and a storage medium; at least one processor and an interface circuit, where the interface circuit is configured to receive signals from other communication devices other than the communication device and transmit to the processor Or send the signal from the processor to other communication devices than the communication device, and the processor is used to implement the second aspect and any one of the possible implementations of the second aspect through logic circuits or executing code instructions.
  • the communication device may be an access network device or a chip in the access network device.
  • the present application provides a communication device, comprising: a processor and a storage medium; at least one processor and an interface circuit, where the interface circuit is configured to receive signals from other communication devices other than the communication device and transmit them to the processor
  • the processor or the signal from the processor is sent to the communication device other than the communication device, and the processor is used to realize the third aspect and any one of the possible implementation manners of the third aspect through logic circuits or executing code instructions.
  • the communication device may be an access network device or a chip in the access network device.
  • the present application provides a communication device, comprising: a processor and a storage medium; at least one processor and an interface circuit, where the interface circuit is configured to receive signals from other communication devices other than the communication device and transmit them to the processor
  • the processor or the signal from the processor is sent to the communication device other than the communication device, and the processor is used to realize the fourth aspect and any one of the possible implementation manners of the fourth aspect through logic circuits or executing code instructions.
  • the communication device may be a terminal device or a chip in the terminal device.
  • the present application provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions are executed on a computer, the computer is made to execute any one of the first aspect and the first aspect. methods described in possible implementations.
  • the present application provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions are executed on a computer, the computer is made to execute any one of the second aspect and the second aspect. methods described in possible implementations.
  • the present application provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions are executed on a computer, the computer is made to execute any one of the third aspect and the third aspect. methods described in possible implementations.
  • the present application provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions are executed on a computer, the computer is made to execute any one of the fourth aspect and the fourth aspect methods described in possible implementations.
  • the present application provides a computer program product comprising instructions, when the computer program product is run on a computer, causing the computer to perform as described in the first aspect and any possible implementation manner of the first aspect Methods.
  • the present application provides a computer program product comprising instructions, when the computer program product is run on a computer, causing the computer to perform as described in the second aspect and any possible implementation of the second aspect Methods.
  • the present application provides a computer program product comprising instructions, when the computer program product is run on a computer, causing the computer to perform as described in the third aspect and any possible implementation manner of the third aspect Methods.
  • the present application provides a computer program product comprising instructions that, when the computer program product is run on a computer, cause the computer to perform as described in the fourth aspect and any possible implementation manner of the fourth aspect Methods.
  • FIG. 1 is a schematic diagram of a MBS transmission process provided by the present application.
  • FIG. 2 is a system architecture diagram of a communication system provided by an embodiment of the present application.
  • FIG. 3 is a system architecture diagram of another communication system provided by an embodiment of the present application.
  • FIG. 4 is a schematic diagram of the architecture of a user plane protocol stack provided by an embodiment of the present application.
  • FIG. 5 is a schematic flowchart of a method for cell measurement and handover provided by an embodiment of the present application
  • FIG. 6 is a schematic flowchart of a communication method provided by an embodiment of the present application.
  • FIG. 7 is a schematic flowchart of another communication method provided by an embodiment of the present application.
  • FIG. 8 is a schematic diagram of the configuration of an MRB and a DRB according to an embodiment of the present application.
  • FIG. 9 is a schematic flowchart of another communication method provided by an embodiment of the present application.
  • FIG. 10 is a schematic flowchart of another communication method provided by an embodiment of the present application.
  • FIG. 11 is a schematic flowchart of another communication method provided by an embodiment of the present application.
  • FIG. 12 is a schematic structural diagram of a communication device according to an embodiment of the present application.
  • FIG. 13 is a schematic diagram of a hardware structure of a communication device provided by an embodiment of the present application.
  • FIG. 14 is a schematic diagram of a hardware structure of a communication device according to an embodiment of the present application.
  • FIG. 15 is a schematic diagram of a hardware structure of a terminal device provided by an embodiment of the application.
  • FIG. 16 is a schematic diagram of a hardware structure of an access network device according to an embodiment of the present application.
  • the communication systems in the embodiments of the present application include but are not limited to long term evolution (long term evolution, LTE) systems, fifth generation (5th-generation, 5G) systems, new radio (new radio, NR) systems, wireless local area networks (wireless local area networks) area networks, WLAN) systems and future evolution systems or various communication fusion systems.
  • the 4G system may also be called an evolved packet system (EPS).
  • the core network of the 4G system may be called an evolved packet core (EPC), and the access network may be called long term evolution (LTE).
  • EPC evolved packet core
  • LTE long term evolution
  • the core network of the 5G system can be called 5GC (5G core), and the access network can be called new radio (NR).
  • the application of the application to the 5G system is exemplified in the following to illustrate the application, but it can be understood that the application is also applicable to the 4G system, the third generation (3th Generation, 3G) system, etc., without limitation .
  • the methods provided in the embodiments of the present application may be specifically applied to an evolved global terrestrial radio access network (evolved-universal terrestrial radio access network, E-UTRAN) and a next generation-radio access network (next generation-radio access network). , NG-RAN) system.
  • E-UTRAN evolved-universal terrestrial radio access network
  • NG-RAN next generation-radio access network
  • the access network device in the embodiment of the present application is an entity on the network side that is used for sending a signal, or receiving a signal, or sending a signal and receiving a signal.
  • the access network equipment may be a device deployed in a radio access network (RAN) to provide wireless communication functions for terminal equipment, for example, a TRP, a base station (for example, an evolved NodeB (evolved NodeB, eNB or eNodeB) , next generation node base station (gNB), next generation eNB (next generation eNB, ng-eNB, etc.), various forms of control nodes (eg, network controllers, wireless controllers (eg, cloud Wireless controller in the cloud radio access network (CRAN) scenario), road side unit (road side unit, RSU), etc.
  • RAN radio access network
  • the access network equipment may be various forms of macro base station, micro base station (also called small cell), relay station, access point (access point, AP), etc., or may be the antenna panel of the base station.
  • the control node can be connected to multiple base stations, and configure resources for multiple terminal devices covered by the multiple base stations.
  • the names of devices with base station functions may vary. For example, it may be called eNB or eNodeB in LTE system, and may be called gNB in 5G system or NR system, and the specific name of the base station is not limited in this application.
  • the access network device may also be an access network device or the like in a public land mobile network (public land mobile network, PLMN) to be evolved in the future.
  • PLMN public land mobile network
  • the terminal device in this embodiment of the present application is an entity on the user side that is used to receive a signal, or send a signal, or receive a signal and send a signal.
  • Terminal devices are used to provide one or more of voice services and data connectivity services to users.
  • Terminal equipment may also be referred to as user equipment (UE), terminal, access terminal, subscriber unit, subscriber station, mobile station, remote station, remote terminal, mobile device, user terminal, wireless communication device, user agent, or user device.
  • UE user equipment
  • the terminal device can be a vehicle to everything (V2X) device, for example, a smart car (smart car or intelligent car), a digital car (digital car), an unmanned car (unmanned car or driverless car or pilotless car or automobile), Self-driving car (self-driving car or autonomous car), pure electric vehicle (pure EV or Battery EV), hybrid electric vehicle (HEV), range extended EV (REEV), plug-in hybrid Power vehicle (plug-in HEV, PHEV), new energy vehicle (new energy vehicle), etc.
  • the terminal device may also be a device to device (device to device, D2D) device, such as an electricity meter, a water meter, and the like.
  • the terminal device may also be a mobile station (mobile station, MS), a subscriber unit (subscriber unit), an unmanned aerial vehicle, an internet of things (IoT) device, a station (station, ST) in a WLAN, a cellular phone (cellular phone) phone), smart phone (smart phone), cordless phone, wireless data card, tablet computer, session initiation protocol (SIP) phone, wireless local loop (WLL) station, personal digital processing ( personal digital assistant (PDA) device, laptop computer (laptop computer), machine type communication (MTC) terminal, handheld device with wireless communication capabilities, computing device or other processing device connected to a wireless modem, in-vehicle Devices, wearable devices (also known as wearable smart devices).
  • the terminal device may also be a terminal device in a next-generation communication system, for example, a terminal device in a 5G system or a terminal device in a future evolved PLMN, a terminal device in an NR system, and the like.
  • the communication method provided by the embodiment of the present application can be applied to the communication system 100 shown in FIG. 2 .
  • the communication system 100 includes: an MBS server 10 , a core network device 20 , and a first access network device 30 .
  • the second access network device 40 and the terminal device 50 are included in the communication system 100 shown in FIG. 2 .
  • the MBS server 10 is used for providing MBS.
  • the core network device 20 is configured to receive the MBS from the MBS server, and send the MBS to the access network device (the first access network device or the second access network device).
  • the first access network device 30 is the access network device currently accessed by the terminal device 50 (ie, the source base station).
  • the first access network device 30 is configured to provide network services for the terminal device before the terminal device performs cell handover. For example, before the cell handover, the first access network device 30 is configured to receive the MBS from the core network device 20 and send the MBS to the terminal device 50 .
  • the second access network device 40 is the access network device (ie, the target base station) to be handed over by the terminal device 50 .
  • the second access network device is configured to provide network services for the terminal device after the terminal device performs cell handover.
  • the second access network device 40 is configured to receive the MBS from the core network device 20 and send the MBS to the terminal device 50 .
  • the terminal device 50 is configured to communicate with the access network device, receive data from the access network device, or send data to the access network device.
  • the terminal device 50 is used to receive MBS from the access network device.
  • the first access network device is an access network device that supports the multicast broadcast transmission mode
  • the second access network device is an access network device that does not support the multicast broadcast transmission mode.
  • MBS is transmitted between the core network device and the first access network device through an MBS session
  • MBS is transmitted between the core network device and the second access network device through a unicast PDU session.
  • MBS is transmitted between the first access network device and the terminal device through a multicast radio bearer (MRB), and unicast services are transmitted through a unicast radio bearer.
  • MMB multicast radio bearer
  • the unicast service is transmitted between the second access network device and the terminal device through a unicast wireless bearer.
  • the terminal device may be any terminal device with functions of receiving data and/or sending data, such as a mobile phone, a vehicle, and an Internet of Things device as shown in FIG. 3.
  • the terminal device may also be a device having the capability of receiving data, such as a public safety device not shown in FIG. 3 , and the type of the terminal device is not limited in this application.
  • the user plane protocol stack structure used by terminal equipment and access network equipment includes: radio resource control (radio resource control, RRC) layer, service data adaptation (service data adaptation protocol, SDAP) layer, PDCP layer, RLC layer, media access control (media Access Link control, MAC) and physical (physical, PHY) layer.
  • RRC radio resource control
  • SDAP service data adaptation protocol
  • PDCP layer packet data convergence protocol
  • RLC media access control
  • MAC media Access Link control
  • PHY physical (physical, PHY) layer.
  • the PHY layer is located at the bottom layer (layer 1), the MAC layer, RLC layer, PDCP layer and SDAP layer belong to the second layer (layer 2), and the RRC layer belongs to the third layer (layer 3).
  • 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
  • the SDAP layer is located above the PDCP layer above the layer.
  • MBS is usually a service sent by an access network device to a terminal device. Therefore, when transmitting MBS, the MBS transmission process is as follows:
  • MBS first arrives at the SDAP layer of the first access network device; after the mapping of the SDAP layer, it is transmitted to the corresponding PDCP entity; after being processed by the PDCP layer of the first access network device, it is transmitted to the RLC layer and the MAC layer; After the processing, it is sent from the PHY layer and transmitted to the terminal device through the air interface.
  • Each protocol layer of the terminal device sequentially performs corresponding processing on the data packets according to the processing sequence opposite to that of the first access network device.
  • the processing of data packets by various layers can be visually combined, which is called a radio bearer.
  • a radio bearer There are corresponding functional entities to perform corresponding functions, such as the PDCP entity of the PDCP layer.
  • Each radio bearer configuration will contain a PDCP entity, and at the same time, the radio bearer configuration will be associated with at least one RLC entity, and each RLC entity corresponds to a logical channel.
  • the protocol stack structure between the terminal device and the access network device has been described above.
  • the terminal device In the current mobile communication system, there are situations where multiple cells cover the same location, and when the terminal device is located at the same location covered by multiple cells, the terminal device needs to select the cell with the strongest access signal strength. In this way, the terminal device transmits service data on the cell with the strongest signal strength, thereby improving the data transmission quality of the terminal device.
  • the strength of the signals from each cell received by the terminal device will change continuously.
  • the signal strength from cell A received by the terminal device will continue to decrease.
  • the terminal equipment continues to transmit services on cell A, which will cause the service to be stuck, congested, or even dropped.
  • the terminal equipment In order to ensure the transmission quality of the service of the terminal equipment.
  • the terminal equipment if it is determined that the signal strength of the neighboring cell of cell A (referred to as cell B) is greater than the signal strength of cell A, the terminal equipment needs to report the event to the access network equipment (that is, the signal strength of cell B is greater than that of cell B). signal strength of cell A) to trigger the access network device to initiate a handover procedure to switch the terminal device from cell A to cell B.
  • the terminal equipment can always keep transmitting services on the cell with strong signal strength, so as to ensure the transmission quality of the terminal equipment services.
  • the method for performing cell measurement and handover between the terminal device and the first access network device includes the following steps 1 to 10:
  • Step 1 The terminal device is connected to the first access network device.
  • the first access network device may be the above-mentioned cell A.
  • the access of the terminal equipment to the access network equipment may be implemented as: the terminal equipment camps on the cell A and enters a connected state.
  • Step 2 The first access network device sends measurement configuration parameters to the terminal device.
  • the terminal device receives the measurement configuration parameter from the first access network device.
  • the measurement configuration parameter is carried in an RRC reconfiguration (RRCReconfiguration) message sent by the first access network device to the terminal device. That is to say, the RRC reconfiguration message sent by the first access network device to the terminal device includes the measurement configuration parameter (MeasConfig).
  • the measurement configuration parameters recorded in the embodiments of the present application include at least one of the following information: measurement frequency/cell information, reporting threshold configuration, filtering parameter configuration, timer duration configuration, and other information.
  • the measurement frequency/cell information is used to indicate the cell to be measured and the frequency corresponding to the cell.
  • the measurement frequency/cell information includes the information of the cell currently accessed by the terminal device.
  • the measurement frequency point cell information may only include the frequency point information that needs to be measured, and at this time, the information of the current access cell may be indicated by an RRC reconfiguration message.
  • the reporting 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 is used to filter the signal strength of the cell currently measured by the terminal device and the measurement result of the cell determined by the terminal device in the previous cell measurement, so as to determine the measurement result of the cell.
  • Step 3 The terminal device measures the signal strength of the frequency point or cell according to the measurement configuration parameter, and determines the measurement result.
  • the measurement configuration parameter indicates that the cells to be measured include cell A and cell B.
  • the terminal device starts the physical (PHY) layer to measure the signal strength of cell A according to the frequency configuration or cell configuration information in the measurement configuration parameters, and the PHY layer of the terminal device sends the signal strength of cell A to the RRC layer of the terminal device.
  • the RRC layer of the terminal device determines the measurement result of cell A according to the signal strength of cell A, the previous measurement result of cell A, and the filter coefficient.
  • the terminal device starts the physical layer to measure the signal strength of cell B according to the frequency configuration or cell configuration information in the measurement configuration parameters, and the PHY layer of the terminal device sends the signal strength of cell B to the RRC layer of the terminal device.
  • the RRC layer of the terminal device determines 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 performs the following steps 3.1 to 3.3 to determine the measurement result of cell A.
  • Step 3.1 The terminal device starts a physical (PHY) layer to measure the reference signal of cell A, and determine the current signal strength of cell A.
  • PHY physical
  • the signal strength of cell A includes but is not limited to at least one of the following: reference signal receiving power (reference signal receiving power, RSRP) value; reference signal receiving quality (reference signal receiving quality, RSRQ) value; signal-to-interference plus noise ratio (signal to interference plus noise ratio, SINR) value, received signal strength indication (received signal strength indication, RSSI).
  • reference signal receiving power reference signal receiving power
  • RSRQ reference signal receiving quality
  • SINR signal-to-interference plus noise ratio
  • RSSI received signal strength indication
  • Step 3.2 the terminal device determines the previous measurement result of cell A.
  • the previous measurement result of cell A is determined according to the signal strength of cell A determined by the terminal device last time, and the filtering parameters. .
  • Step 3.3 The terminal device determines the measurement result of cell A according to formula 1, the current signal strength of cell A, and the previous measurement result of cell A.
  • the terminal device measures the signal strength of cell A for the first time, the terminal device directly uses the measurement result in step 3.1 as the measurement result of cell A, without the need to follow the methods recorded in steps 3.1 to 3.3 above. Determine the final measurement result.
  • the terminal equipment For cell B, the terminal equipment performs a manner similar to the above steps 3.1 to 3.3 to determine the measurement result of cell B.
  • Step 4 The terminal device determines a measurement report according to the measurement result.
  • the RRC layer of the terminal device determines the measurement results of each cell.
  • the RRC layer of the terminal device evaluates the measurement results of each cell, and determines whether the current measurement result meets one of the measurement events that need to be reported. If so, the RRC layer of the terminal device generates a corresponding measurement report and sends it to the first access The network device sends the measurement report.
  • the measurement report is used to report the measurement event to the access network device.
  • Example 1 the measurement events determined by the terminal device to be reported include:
  • A1 The measurement result of the serving cell is higher than the threshold a 1 .
  • A2 The measurement result of the serving cell is lower than the threshold a 2 .
  • A3 The neighbor cell measurement result is higher than the serving cell measurement result + offset value (offset).
  • A4 The neighboring cell measurement result is higher than the threshold a 3 .
  • A5 The measurement result of the serving cell is lower than the threshold a 4 , and the measurement result of the neighbor cell is higher than the threshold a 5 .
  • A6 The neighbor cell measurement result is higher than the Scell measurement result + offset value (offset).
  • the measurement result of the inter-system cell is higher than the threshold a 7 , and the SPcell measurement result is lower than the threshold a 8 .
  • the serving cell above is cell A
  • the neighboring cell is cell B.
  • the terminal device determines whether the measurement results of cell A and cell B satisfy the measurement event that needs to be reported according to the measurement results of cell A and cell B. If a measurement event that needs to be reported is satisfied, the terminal device generates a measurement report corresponding to the event.
  • the events to be reported may also include other types of events, which are not limited in this application.
  • the terminal device may determine the measurement event to be reported according to the MeasIdList in the measurement configuration sent by the access network device.
  • MeasIdList is used to associate frequency/cell information with measurement events to be reported and measurement reporting conditions.
  • the measurement event that the terminal device needs to report includes the above-mentioned A3 event.
  • the terminal device determines that the current measurement result satisfies the A3 event, the terminal device generates a measurement report corresponding to the A3 event.
  • the measurement report generated by the terminal device usually includes only one measurement event that needs to be reported. In the case that there are multiple measurement events to be reported, and the terminal device determines that the current measurement result satisfies multiple measurement events to be reported at the same time, the terminal device generates a corresponding measurement report for each measurement event to be reported, and sends the corresponding measurement reports to each measurement event one by one. The access network equipment sends these measurement reports.
  • Step 5 The terminal device sends a measurement report to the first access network device, and accordingly, the terminal device receives the measurement report from the first access network device.
  • Step 6 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.
  • the second access network device receives the handover request from the first access network device.
  • the second access network device is an access network device to which the terminal device needs to be handed over.
  • the first access network device is also referred to as the source base station, which corresponds to the cell A described in step 3 above.
  • the second access network device is also referred to as a target base station, and corresponds to the cell B described in step 3 above.
  • Step 7 The second access network device sends handover request acknowledgment information (Handover Request ACK) to the first access network device.
  • the first access network device receives the handover request confirmation information from the second access network device.
  • the second access network device determines the number of its own device connections, allocation of time-frequency resources, load, etc. .
  • the second access network device sends handover request confirmation information to the first access network device.
  • the above handover request confirmation information includes at least one of the following: a cell radio network temporary identifier (cell radio network temporary identifier, C-RNTI), and a security algorithm of the second access network device.
  • a cell radio network temporary identifier cell radio network temporary identifier, C-RNTI
  • a security algorithm of the second access network device includes at least one of the following: a cell radio network temporary identifier (cell radio network temporary identifier, C-RNTI), and a security algorithm of the second access network device.
  • Step 8 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 includes: handover request confirmation information sent by the second access network device to the first access network device. That is to say, in step 8, the first access network device may use a transparent transmission method to send the handover request confirmation information sent by the second access network device to the first access network device to the terminal device.
  • the RRC reconfiguration message includes at least one of the following: Relevant information of the second access network device, and configuration parameters required by the terminal device to access the second access network device.
  • the RRC reconfiguration message includes at least one of the following: the physical cell identifier (PCI) of the cell B, the frequency information of the cell B (such as the frequency of the cell B, or other frequency information), the cell B The C-RNTI allocated to the terminal equipment, the random access channel (random access channel, RACH) resource information (such as dedicated RACH resources and/or public RACH resources) required to access cell B.
  • PCI physical cell identifier
  • RACH random access channel
  • resource information such as dedicated RACH resources and/or public RACH resources
  • Step 9 The terminal device initiates random access to the second access network device.
  • the terminal device 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.
  • Step 10 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
  • the second access network device does not support the multicast broadcast transmission mode
  • the terminal device cannot continue to receive the MBS from the second access network device through the multicast broadcast transmission mode, which will not guarantee the service continuity of the MBS.
  • the present application provides a communication method for switching from a first access network device that supports multicast broadcast transmission mode to a second access network device that does not support multicast broadcast transmission mode when a terminal device In this case, the continuity of the MBS service is guaranteed.
  • 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 the multicast broadcast transmission mode, and if the second access network device does not support the multicast broadcast transmission mode In the case of the multicast broadcast transmission mode, the first access network device instructs the terminal device to configure the first radio bearer carrying the MBS as the second radio bearer carrying the unicast service. Correspondingly, the terminal device configures the first radio bearer as the second radio bearer. After that, MBS is transmitted between the terminal device and the first access network device through the second radio bearer.
  • the first access network device and the second access network device directly switch the MBS being transmitted to the second access network device according to the current mode of switching the unicast service, which solves the problem of the MBS terminal's inconvenience caused by the second access network device not supporting the multicast broadcast transmission mode. question.
  • the communication method provided by the embodiment of the present application is applied to the communication system as shown in FIG. 2 .
  • the communication method includes:
  • the first access network device sends first indication information to the terminal device.
  • the terminal device receives the first indication information from the first access network device.
  • the first indication information is used to instruct the terminal device to configure the first radio bearer as a second radio bearer; the first radio bearer is a multicast radio bearer, and the second radio bearer is a unicast radio bearer.
  • the first access network device is an access network device that supports the multicast broadcast transmission mode. Before sending the first indication information, the first access network device receives a measurement report from the terminal device, where the measurement report is used to trigger the first access network device to switch the terminal device to the second access network device, and the second access network device.
  • the network access device is an access network device that does not support the multicast broadcast transmission mode.
  • the first indication information is specifically used to indicate at least one of the following information of the second radio bearer: PDCP configuration information, RLC configuration information, security configuration information, and an identifier of the second radio bearer.
  • the terminal device may determine that the second radio bearer configured this time is configured based on the first radio bearer according to the same identification of the second radio bearer as the first radio bearer.
  • the second radio bearer uses at least one of the following configuration information of the first radio bearer: PDCP configuration information, PTP RLC configuration information.
  • the PDCP entity corresponding to the second radio bearer uses the transmission state and transmission parameters of the transmission window of the PDCP entity corresponding to the first radio bearer.
  • the transmission state and transmission parameters of the transmission window include at least one of the following: the currently sent data packet with the largest SN, the successfully sent data packet, the unsuccessfully sent data packet, the size of the transmission window, the running state of the timer related to the transmission window, etc. .
  • the first indication information includes a first identifier, and the first identifier is used to indicate the terminal device Use at least one of PDCP configuration information and PTP RLC configuration information.
  • the first indication information includes two bits, which are respectively used to indicate whether to use the PDCP configuration information and/or the PTP RLC configuration information of the first radio bearer. Time instructions are not used.
  • the first indication information is used to instruct the terminal device not to use the PDCP configuration information of the first radio bearer, nor to use the PTP RLC configuration information of the first radio bearer.
  • the first indication information is used to instruct the terminal device not to use the PDCP configuration information of the first radio bearer, but to use the PTP RLC configuration information of the first radio bearer.
  • the first indication information is used to instruct the terminal device to continue to use the PDCP configuration information of the first radio bearer and not to use the PTP RLC configuration information of the first radio bearer.
  • the first indication information is used to instruct the terminal device to use both the PDCP configuration information of the first radio bearer and the PTP RLC configuration information of the first radio bearer.
  • the first indication information is used to indicate that the current configuration is a special type of configuration, and it is agreed in the protocol. After the terminal device receives this type of configuration, the PDCP configuration information and PTP configuration information of the previous wireless bearer are used. At least one item of RLC configuration information.
  • the first access network device sends the MBS to the terminal device through the second radio bearer.
  • the terminal device receives the MBS sent by the first access network device through the second radio bearer.
  • the first radio bearer is an MBS radio bearer (MBS radio bearer, MRB).
  • MBS radio bearer MRB
  • DRB data radio bearer
  • the first radio bearer is MRB
  • the second radio bearer is DRB as an example for description.
  • the terminal device, the first access network device and the second access network device may perform cell handover according to the solutions described in steps 6 to 10 in the above-mentioned FIG. 5 .
  • the terminal device is switched to the second access network device, the above-mentioned MBS is transmitted in the form of unicast.
  • the first access network device when the terminal device needs to be switched from the first access network device that supports the multicast broadcast transmission mode to the second access network device that does not support the multicast broadcast transmission mode, the first access network device will The first radio bearer currently used to carry the MBS between the first access network device and the terminal device is configured as the second radio bearer used to carry the unicast service. The first access network device sends the MBS to the terminal device in the form of unicast through the second radio bearer.
  • the MBS 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 being transmitted to the second access network device according to the current mode of switching the unicast service, which solves the problem of MBS terminals caused by the second access network device not supporting the multicast broadcast transmission mode.
  • the method provided by this embodiment of the present application further includes the following S700-S703, which are described in detail below:
  • the core network device sends the MBS to the first access network device.
  • the first access network device receives the MBS from the core network device.
  • the core network device After the terminal device accesses the first access network device, if MBS needs to be transmitted between the terminal device and the first access network device, before transmitting the MBS, the core network device initiates an MBS session (MBS session) or MBS
  • MBS session MBS session
  • the flow establishment/modification request is used to establish a transmission channel for transmitting MBS between the core network device and the first access network device.
  • the core network device transmits the MBS to the first access network device through the established transmission channel.
  • a first radio bearer (MRB) is established between the first access network device and the terminal device, and MBS is transmitted between the first access network device and the terminal device through the first radio bearer.
  • the terminal device sends a measurement report to the first access network device.
  • the first access network device needs to instruct the terminal device to configure the first radio bearer as the second radio bearer, and use the second radio bearer to configure the first radio bearer as the second radio bearer.
  • Bearer transport MBS Bearer transport MBS. Therefore, the time required for the terminal equipment to perform cell handover will increase.
  • the present application also provides a method that can trigger the terminal equipment to report a measurement report in advance, so that the terminal equipment has enough time to perform Cell handover.
  • the terminal device may be triggered by a new measurement event and report the measurement report.
  • the new measurement event is used to make the terminal equipment trigger and report the measurement report in advance.
  • the new measurement event includes at least one 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 .
  • E5 The measurement result of the serving cell is lower than the threshold b 4 , and the measurement result of the neighbor cell is higher than the threshold b 5 .
  • E6 The neighbor cell measurement result+d is higher than the Scell measurement result+offset value.
  • F1 The measurement result of the inter-system cell is higher than the threshold b 6 .
  • F2 The measurement result of the inter-system cell is higher than the threshold b7 , and the SPcell measurement result 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 terminal device can trigger and report the measurement report in advance, so that the terminal device has enough time to configure the first radio bearer as the second radio bearer and perform cell handover, which reduces the probability of terminal device handover failure or The length of business interruption.
  • the 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 be based on the existing measurement mechanism and whether the target base station supports multiple
  • the broadcast transmission mode determines whether to configure the MRB as a DRB first and then perform 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 the multicast broadcast transmission mode.
  • the method for the first access network device to determine whether the first access network device supports the multicast broadcast transmission mode includes at least the following three modes, respectively: mode 1, the first access network device passes the Perform signaling interaction with the second access network device to determine whether the second access network device supports the multicast broadcast transmission mode; in mode 2, the first access network device determines the first access network device through an operation and maintenance management (operation administration and maintenance, OAM) system. 2. Whether the access network device supports the multicast broadcast transmission mode; in mode 3, the first access network device determines whether the second access network device supports the multicast broadcast transmission mode through the historical handover record.
  • mode 1 the first access network device passes the Perform signaling interaction with the second access network device to determine whether the second access network device supports the multicast broadcast transmission mode
  • OAM operation administration and maintenance
  • Manner 1 The first access network device determines whether the second access network device supports the multicast broadcast transmission mode by performing signaling interaction with the second access network device.
  • Mode 1 may be implemented through the following steps a to c.
  • Step a The first access network device sends request information to the second access network device.
  • the second access network device receives the request information from the first access network device.
  • the request information is used to request to query whether the second access network device supports the multicast broadcast transmission mode.
  • Step b The second access network device sends response information to the first access network device.
  • the first access network device receives the response information from the second access network device.
  • the response information is used to indicate whether the second access network device supports the multicast broadcast transmission mode.
  • a bit in the response information is used to indicate whether the second access network device supports the multicast broadcast transmission mode.
  • the response information is used to indicate that the second access network device does not support the multicast broadcast transmission mode.
  • the response information is used to indicate that the second access network device supports the multicast broadcast transmission mode.
  • Step c The first access network device determines whether the second access network device supports the multicast broadcast transmission mode according to the response information.
  • the first access network device determines whether the second access network device supports the multicast broadcast transmission mode according to the value of the bit in the response information.
  • Manner 2 The first access network device determines through the OAM system whether the second access network device supports the multicast broadcast transmission mode.
  • the above-mentioned OAM system is an OAM system to which the second access network device belongs, and the configuration information of the second access network device is stored in the OAM system.
  • Manner 3 The first access network device determines whether the second access network device supports the multicast broadcast transmission mode through the historical handover record.
  • the first access network device may determine the second access network according to the method described in the foregoing method 1 or method 2 Whether the device supports the multicast broadcast transmission method. After that, the first access network device stores the historical handover record, where the historical handover record can represent information whether the second access network device supports the multicast broadcast transmission mode.
  • the first access network device determines whether the second access network device supports the multicast broadcast transmission mode according to the stored historical handover record.
  • the first access network device and the terminal device execute the above S600 and S601.
  • the first access network device determines that the second access network device supports the multicast broadcast transmission mode
  • the first access network device, the second access network device and the terminal device directly follow the steps 6- Step 10 performs cell handover.
  • the session between the first access network device and the core network device can also be converted from the original MBS session. It is a unicast session (case 1), or, the MBS session is still maintained between the first access network device and the core network device (case 2).
  • Case 1 The MBS session between the first access network device and the core network device is converted into a unicast session, and the MBS is transmitted between the first access network device and the core network device through the unicast session.
  • the method further includes S704.
  • the first access network device sends second indication information to the core network device.
  • the core network device receives the second indication information from the first access network.
  • the above-mentioned second indication information is used to instruct the core network device to send the MBS to the first access network device through a unicast session or a unicast quality of service flow corresponding to the terminal device.
  • the second indication information is further used to indicate the sequence number of the data packet.
  • the data packet sequence number is the data packet sequence number of the first data packet of the MBS sent by the core network device through the unicast session or the unicast quality of service flow.
  • the above-mentioned data packet serial number may be the general packet radio service tunneling protocol-user plane (GPRS Tunnelling Protocol-U, GTP-U) serial number (Serial Number, SN) of the data packet or QoS Flow ID (QoS Flow ID, QFI) )SN.
  • GPRS Tunnelling Protocol-U GTP-U
  • QoS Flow ID QoS Flow ID, QFI
  • Case 2 The MBS session is still maintained between the first access network device and the core network device to transmit MBS.
  • the first access network device maps the MBS data to the above-mentioned second radio bearer for transmission.
  • the terminal device configures the first radio bearer as the second radio bearer.
  • the first indication information may be an RRC message sent by the first access network device to the terminal device.
  • the RRC message is used to instruct the terminal device to reconfigure the MRB to the DRB.
  • the MRB before reconfiguration includes at least one of the following: PDCP configuration, service identifier, and radio bearer identifier.
  • the MRB configuration is associated with the PTP RLC configuration and the PTM RLC configuration, which are used for PTP transmission and PTM transmission of data packets, respectively.
  • the reconfigured DRB includes at least one of the following: PDCP configuration, security configuration, radio bearer identification, and associated PTP RLC configuration.
  • the temporary multicast group identifier (TMGI) in the MRB configuration will be deleted, and a security configuration will be added to the MRB.
  • the DRB after reconfiguration is consistent with the radio bearer identifier of the MRB before the reconfiguration.
  • the first indication information includes at least one of the following information: PDCP configuration information, RLC configuration information, security configuration information, and DRB identification information.
  • PDCP configuration information includes at least one of the following information: RLC configuration information, security configuration information, and DRB identification information.
  • the first indication information may include PDCP configuration information, or may not include PDCP configuration information.
  • the terminal device determines to continue to use the PDCP configuration in the MRB as the PDCP configuration of the DRB. At this time, the terminal device determines to reserve the PDCP configuration in the MRB as the PDCP configuration of the DRB.
  • the terminal device configures the PDCP configuration of the DRB according to the PDCP configuration information. At this time, the terminal device releases the PDCP configuration in the MRB, and performs the PDCP configuration according to the PDCP configuration information in the first indication information.
  • RLC configuration information used to indicate the configuration information of the RLC associated with the DRB
  • the first indication information may include RLC configuration information, or may not include RLC configuration information.
  • the terminal device determines to continue to use the PTP RLC in the MRB as the RLC configuration of the DRB. At this time, the terminal equipment ensures that the PTP RLC in the MRB is reserved as the RLC configuration of the DRB.
  • the terminal device configures the RLC configuration of the DRB according to the RLC configuration information in the first indication information. At this time, the terminal device releases the RLC configuration in the MRB, and configures the RLC configuration of the DRB according to the RLC configuration information in the first indication information.
  • the security configuration information which is used to configure the security configuration of the DRB.
  • the PDCP entity performs security processing on the data packets according to the security configuration, so as to improve the security of the data.
  • the first access network device determines that the PDCP entity corresponding to the second radio bearer uses the transmission of the PDCP entity corresponding to the first radio bearer. The transmission status and transmission parameters of the window.
  • the first access network device and the terminal device do not re-establish a new PDCP entity, but keep the DRB still using the PDCP entity corresponding to the MRB. Meanwhile, the first access network device and the terminal device do not initialize or reset the transmission state and transmission parameters of the transmission window of the PDCP entity corresponding to the MRB.
  • the first access network device may also recreate the PDCP entity.
  • the transmission state and transmission parameters of the transmission window of the rebuilt PDCP entity need to be initialized or reset.
  • the first access network device needs to perform redundant transmission.
  • the first access network device determines that before configuring the MRB as a DRB, the first access network device is a terminal device and transmits data packet #10, then after configuring the MRB as a DRB, the first access network device converts the data from the data packet #10. Packets prior to Packet #10 (eg, Packet #5) begin transmission to reduce packet loss.
  • Packets prior to Packet #10 eg, Packet #5 begin transmission to reduce packet loss.
  • the embodiments of the present application provide a method in which, before the terminal device performs cell handover, the terminal device configures the MRD as the DRB, and then the first access network device and the terminal device transmit the MBS in the form of unicast. method. After that, the terminal device can perform cell handover according to the existing handover process. At this time, since the MBS is sent in a unicast form, after the MBS is handed over to the second access network device, the MBS can still be transmitted in a unicast form to avoid It solves the problem that the service continuity of MBS cannot be guaranteed after cell handover.
  • the embodiment of the present application also provides a communication method, in which the MBS is transmitted in the form of multicast between the first access network device and the terminal device before handover. After the handover, the MBS is transmitted between the terminal device and the second access network device in the form of unicast. The first access network device sends the unsent MBS to the second access network device in the form of unicast.
  • the communication method includes: S900-S903. A detailed description will be given below.
  • the first access network device receives the third indication information.
  • the third indication information is used to indicate the association relationship between the unicast QoS flow and the MBS QoS flow.
  • the third indication information may be carried in the MBS context information sent by the core network device to the first access network device. For example, when the MBS session or the MBS flow is established, the core network device sends the third indication information to the first access network device through the MBS context information.
  • the third indication information includes at least one of the following: a flow identifier of the unicast QoS flow corresponding to the MBS QoS flow, and a QoS parameter of the unicast QoS flow.
  • the flow identification of the flow identification of the unicast quality of service flow may be represented by the identification of the PDU session of the unicast quality of service flow, or the identification of the flow identification of the unicast quality of service flow.
  • the third indication information is indication information sent by the core network device to the second access network device.
  • the time when the core network device sends the third indication information to the first access network device may be before the terminal device sends the measurement report to the first access network device, or after the terminal device sends the measurement report to the first access network device, Alternatively, the time when the terminal device sends the measurement report to the first access network device may be the same, which is not limited in this application.
  • the third indication information is further used to indicate the association relationship between the MBS session and the unicast session, which is not limited in this application.
  • the first access network device maps the MBS QoS flow to the unicast QoS flow according to the third indication information.
  • the first access network device forwards the unicast quality of service flow to the second access network device.
  • a data transmission channel is established between the first access network device and the second access network device. Since the second access network device does not support the multicast broadcast transmission mode, it cannot identify the MBS quality of service flow. Therefore, the first access network device maps the MBS quality of service flow to the unicast quality of service flow. After that, the first access network device transmits the unicast QoS stream to the second access network device through the established data transmission channel.
  • the second access network device sends the MBS to the terminal device through the unicast radio bearer.
  • the unicast radio bearer between the second access network device and the terminal device is the unicast radio bearer established in the handover process.
  • the identifier of the generated unicast QoS stream can also be determined according to the association relationship indicated by the third indication information, which is not repeated here.
  • S901 can be specifically implemented by the following S1000-S1007.
  • S1000 The core network device sends the MBS to the first access network device.
  • the first access network device receives the MBS from the core network device. It should be pointed out that the specific implementation manner of S1000 is similar to the above-mentioned S700, which is not repeated in this application.
  • a terminal device sends a measurement report to a first access network device.
  • the first access network device determines the second access network device according to the measurement report.
  • the first access network device sends a handover request (Handover Request) to the second access network device.
  • the second access network device receives the handover request from the first access network device.
  • the handover request may include relevant information of the MBS.
  • the handover request includes MBS context information (MBS info).
  • the second access network device generates first configuration information.
  • the first configuration information is used to instruct the terminal device to perform configuration according to the configuration information of the second access network.
  • the first configuration information includes all configuration information used by the second access network device for cell handover and data transmission with the terminal device.
  • the second access network device After the second access network device receives the handover request from the first access network device, because the second access network device does not support the multicast broadcast transmission mode, the second access network device cannot Identify the MBS information in the handover request.
  • the second access network device determines that the configuration information between the first access network and the terminal device includes configuration information that cannot be identified by the second access network device.
  • the configuration information is performed, and the second access network device generates the first configuration information, so that the terminal device can perform configuration according to the first configuration information.
  • the first configuration information may be full-config (full configuration), which is used to instruct the terminal device to perform configuration based on the configuration information of the second access network device, rather than the configuration information of the second access network device. delta config.
  • the second access network device sends handover request acknowledgment information (Handover Request ACK) to the first access network device.
  • the first access network device receives the handover request confirmation information from the second access network device.
  • the handover request confirmation information includes the above-mentioned first configuration information.
  • the first access network device sends a handover command (Handover command) to the terminal device.
  • the terminal device receives the handover command from the first access network device.
  • the switching command includes the above-mentioned first configuration information.
  • the terminal device After the terminal device receives the handover command, the terminal device identifies the first configuration information in the handover command, the terminal device configures the second access network device according to the configuration information of the second access network device written in the first configuration information, and sends the second The network access device is switched.
  • the terminal device in the process of configuring the terminal device according to the configuration information of the second access network device, the terminal device establishes a unicast radio bearer between the terminal device and the second access network device, so as to facilitate the subsequent second access network device.
  • the network equipment transmits data to the terminal equipment through the unicast wireless bearer.
  • the first access network device maps the MBS QoS flow to the unicast QoS flow according to the third indication information.
  • the first access network device maps the MBS QoS flow to the unicast QoS flow according to the correspondence between the MBS QoS flow and the unicast QoS flow indicated by the third indication information.
  • the third indication information indicates the mapping relationship between the MBS QoS flow and the identifier of the unicast QoS flow.
  • the first access network device After the first access network device determines the identifier of the unicast QoS stream corresponding to the MBS QoS stream, the first access network device replaces the stream identifier in the packet header of the MBS QoS stream with the corresponding unicast QoS stream to obtain a unicast QoS stream.
  • the first access network device sends the unicast QoS stream to the second access network device through the established data transmission channel.
  • the method further includes:
  • the second access network device sends a path switch request message (Path switch request) to the core network device.
  • Path switch request a path switch request message
  • the path switching request is used to request the core network device to switch the transmission path of the MBS from the first access network device to the second access network device.
  • the path switching request does not include the relevant information of the MBS.
  • the core network device transmits the MBS to the second access network device through a unicast session or a unicast quality of service flow.
  • the core network device determines that the path for which switching is requested is the transmission path of the MBS, and the path switching request does not include the relevant information of the MBS.
  • the core network device determines that the second access network device does not support the multicast broadcast transmission mode.
  • the core network device sends the MBS data packet to the second access network device in the form of a unicast session or a unicast QoS stream.
  • the first access network device and the terminal device maintain a multicast transmission of MBS.
  • the access network device instructs the terminal device to transmit the MBS with the second access network in the form of unicast.
  • the MBS is transmitted between the terminal device and the second access network device in the form of unicast.
  • the first access network device sends the unsent MBS to the second access network device in the form of unicast.
  • the MBS is transmitted in the form of unicast.
  • the method ensures that after the terminal device is switched to the second access network device, the MBS can still be transmitted correctly.
  • the handover process is similar to the existing handover process, which is easy to implement and can ensure the continuity of the terminal equipment receiving MBS.
  • the second access network device A method of sending MBS to terminal equipment in the form of unicast.
  • the MBS is transmitted between the second access network device and the terminal device in the form of unicast
  • the second access network device switches to the mode that supports multicast broadcast transmission.
  • the MBS is still transmitted in the form of unicast between the third access network device and the terminal device.
  • the third access network device is transmitting MBS to other terminals in the form of multicast. If the third access network device still maintains the The MBS is transmitted to the terminal device in the form of unicast, which will cause the third access network device to repeatedly send the MBS, resulting in waste of transmission resources of the third access network.
  • the embodiments of the present application further provide the following method to solve the problem that when a terminal device switches from an access network device that does not support multicast broadcast transmission to an access network device that supports multicast broadcast transmission, due to repeated MBS transmission The resulting waste of transmission resources.
  • the method includes:
  • the core network device determines whether the transmission progress of the MBS transmitted in the unicast form is greater than or equal to the transmission progress of the MBS transmitted in the multicast form.
  • MBS is transmitted in the form of unicast between the terminal device and the access network device that does not support the multicast broadcast transmission mode. After the handover, the MBS is still transmitted between the terminal device and the third access network device in the form of unicast.
  • the core network device determines whether the third access network device supports the multicast broadcast transmission mode.
  • the core network device determines whether the third access network device is currently transmitting the above MBS in the form of multicast.
  • the core network device determines the transmission progress of the MBS transmitted in the unicast form and the transmission progress of the MBS transmitted in the multicast form.
  • the core network device determines whether the transmission progress of the MBS transmitted in the unicast form is greater than or equal to the transmission progress of the MBS transmitted in the multicast form.
  • the core network device sends sixth indication information to the third access network device.
  • the third access network device receives the sixth indication information from the core network device.
  • the sixth indication information is used to instruct the third access network device to configure the unicast session as a multicast session.
  • the sixth indication information is session modification information.
  • the core network device determines the identifier of the MBS data packet currently transmitted in unicast form and the identifier of the MBS data packet currently transmitted in multicast form. If the identifier of the MBS data packet currently transmitted in the unicast form is greater than or equal to the identifier of the MBS data packet currently transmitted in the multicast form.
  • the core network device determines that the identifier of the MBS data packet currently transmitted in unicast form is data packet #9, the identifier of the MBS data packet currently transmitted in unicast form is data packet #7. At this time, the transmission progress of the MBS transmitted in the unicast form is greater than the transmission progress of the MBS transmitted in the multicast form, and the core network device sends sixth indication information to the third access network device.
  • the core network device determines that the identifier of the MBS data packet currently transmitted in unicast form is data packet #9, the identifier of the MBS data packet currently transmitted in unicast form is data packet #11. At this time, the transmission progress of the MBS transmitted in the unicast form is smaller than the transmission progress of the MBS transmitted in the multicast form.
  • the core network device may cause the third access network device to directly associate the MBS transmitted in the unicast form with the MBS transmitted in the multicast form. Because the MBS transmitted by the third access network device in the form of unicast has not sent the data packet #10, and the MBS transmitted by the third access network device in the form of multicast has already sent the data packet #10. At this time, directly associating the MBS with the MBS transmitted in the form of multicast will cause the terminal device to fail to receive the data packet #10.
  • the core network device does not send the sixth indication information to the third access network device, and the core network device can suspend the MBS transmitted in the multicast form until the transmission progress of the MBS transmitted in the unicast form is greater than or It is equal to the transmission progress of the MBS transmitted in the form of multicast.
  • the third access network device sends fourth indication information to the terminal device.
  • the terminal device receives the fourth indication information from the third access network device.
  • the fourth indication information is used to instruct the terminal device to configure the second radio bearer as the first radio bearer; the first radio bearer is a multicast radio bearer, and the second radio bearer is a unicast radio bearer.
  • S1103 The terminal device submits the data packet in the PDCP entity corresponding to the first radio bearer to the high-level protocol entity.
  • the above-mentioned high-level protocol entity is a protocol layer that receives data transmitted by the PDCP entity.
  • transmission control protocol/internet protocol transmission control protocol/internet protocol, TCP/IP
  • application layer application layer
  • user datagram protocol user datagram protocol, UDP
  • the terminal device delivers all the received data packets in the PDCP entity corresponding to the first radio bearer to the high-level protocol entity.
  • the terminal device sequentially delivers the data packets continuously received in the PDCP entity corresponding to the first radio bearer to the high-level protocol entity.
  • the end device deletes other packets, such as packets after receiving holes. Holes refer to the sequence numbers corresponding to unreceived packets.
  • the PDCP entity includes data packet #1, data packet #2, and data packet #4, and the sequence number corresponding to data packet #3 is marked as a hollow data packet.
  • the PDCP entity corresponding to the first radio bearer of the terminal device includes data packet #1, data packet #2, and data packet #4, then the terminal device submits the data packet #1 and data packet #2 to the high-level protocol In the entity, the terminal device deletes the data packet #4, wherein the data packet #3 corresponds to the receiving hole.
  • the terminal device performs at least one of the following operations to configure the second radio bearer as the first radio bearer.
  • the PTM RLC entity is established, the MBS identifier is configured, and the security configuration in the second radio bearer configuration is deleted.
  • configuring the second radio bearer as the first radio bearer by the terminal device is a process opposite to the above-mentioned process of configuring the first radio bearer as the second radio bearer by the terminal device.
  • the third access network device will perform MBS transmission according to the previous MBS transmission situation of the first radio bearer . Therefore, when reconfiguring the transmission state and transmission parameters of the transmission window of the PDCP entity of the second radio bearer, it is necessary to configure the transmission state and transmission parameters of the transmission window of the PDCP entity of the first radio bearer transmitting MBS.
  • the terminal device sends fifth indication information to the third access network device.
  • the third access network device sends fifth indication information to the terminal device.
  • the fifth indication information is used to indicate the sequence number corresponding to the data packet that is not successfully received by the terminal device.
  • the fifth indication information is used to indicate all the data packets that the terminal device has not received.
  • the terminal device When the terminal device submits the data packets continuously received in the PDCP entity corresponding to the first radio bearer to the high-level protocol entity in sequence, and the terminal device deletes other data packets, such as the data packets after receiving holes, the terminal device reports the corresponding data packets received by the holes.
  • the sequence number or the sequence number of the first data packet after the received hole is used to instruct the third access network device to transmit from the data packet.
  • the terminal device reports the sequence number of the data packet #3.
  • the third access network device After receiving the sequence number of the data packet #3, the third access network device starts transmission from the data packet #3.
  • the fifth indication information may indicate the sequence number of the data packet in the form of a bitmap, or may directly indicate the sequence number of the data packet, which is not limited in this application.
  • the third access network device sends the MBD service to the terminal device through the first radio bearer.
  • the terminal device receives the MBD service from the third access network device through the first radio bearer.
  • the terminal device is switched from the second access network device to the third access network device as an example for description. In the actual process, this method can be applied to the terminal device and the access network device.
  • the terminal device switches to the access network device supporting the multicast broadcast transmission mode, which is not limited in this application.
  • an embodiment of the present application provides a communication method.
  • a terminal device is switched from an access network device that does not support multicast broadcast transmission to an access network device that supports multicast broadcast transmission, if When the MBS is transmitted between the terminal equipment and the access network equipment in the form of unicast, the MBS is mapped to the MBS transmitted by the multicast. The problem of wasting transmission resources caused by repeated transmission of MBS is solved.
  • each network element for example, a terminal device, an access network device (for example, a first access network device, a second access network device and/or a third access network device), and core network devices are required to implement
  • the above-mentioned functions include at least one of corresponding hardware structures and software modules to perform each function.
  • Those skilled in the art should easily realize that the present application can be implemented in hardware or a combination of hardware and computer software in combination with the units and algorithm steps of each example described in the embodiments disclosed herein. Whether a function is performed by hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.
  • the access network device, the core network device, and the terminal device may be divided into functional units according to the foregoing method examples.
  • each functional unit may be divided corresponding to each function, or two or more functions may be integrated. in a processing unit.
  • the above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units. It should be noted that the division of units in the embodiments of the present application is illustrative, and is only a logical function division, and other division methods may be used in actual implementation.
  • FIG. 12 shows a possible schematic structural diagram of the communication device (referred to as the communication device 120 ) involved in the above-mentioned embodiment, and the communication device 120 includes a processing unit 1201 and a communication unit 1202 , and may also include a storage unit 1203 .
  • the schematic structural diagram shown in FIG. 12 may be used to illustrate the structures of the access network equipment, core network equipment and terminal equipment involved in the foregoing embodiment.
  • the processing unit 1201 is used to control and manage the actions of the terminal equipment, for example, to control the terminal equipment to perform S600 and S600 in FIG. 6 .
  • the processing unit 1201 may communicate with other network entities through the communication unit 1202, for example, communicate with the first access network device and the second access network device shown in FIG. 2 .
  • the storage unit 1203 is used to store program codes and data of the terminal device.
  • the communication apparatus 120 may be the terminal equipment, or may be a chip in the terminal equipment.
  • the processing unit 1201 is configured to control and manage the actions of the first access network device, for example, control the first access network device.
  • An access network device performs S600 and S601 in FIG. 6, S600, S601, S700 to S703 in FIG. 7, S900, S901 and S902 in FIG. S1007, and/or actions performed by the first access network device in other processes described in the embodiments of this application.
  • the processing unit 1201 may communicate with other network entities through the communication unit 1202, for example, with the terminal device and the access network device shown in FIG. 2 .
  • the storage unit 1203 is used for storing program codes and data of the first access network device.
  • the communication apparatus 120 may be the first access network device, or may be within the first access network device chip.
  • the processing unit 1201 is configured to control and manage the actions of the second access network device, for example, control the first access network device.
  • the second access network device performs S902 and S903 in FIG. 9, S902, S903, S1003 to S1005, S1008 and S1009 in FIG. 10, and/or the second access network in other processes described in the embodiments of this application
  • the action performed by the device may communicate with other network entities through the communication unit 1202, for example, communicate with the terminal device and the first access network device shown in FIG. 2 .
  • the storage unit 1203 is used for storing program codes and data of the second access network device.
  • the communication apparatus 120 may be the second access network device, or may be an internal device of the second access network device. chip.
  • the processing unit 1201 is configured to control and manage the actions of the third access network device, for example, control the third access network device.
  • the third access network device performs S1101 , S1102 , S1105 and S1106 in FIG. 11 , and/or actions performed by the third access network device in other processes described in the embodiments of this application.
  • the processing unit 1201 may communicate with other network entities through the communication unit 1202, for example, communicate with the terminal device and the first access network device shown in FIG. 2 .
  • the storage unit 1203 is used for storing program codes and data of the third access network device.
  • the communication apparatus 120 may be the third access network device, or may be an internal device within the third access network device. chip.
  • the processing unit 1201 is used to control and manage the actions of the core network equipment, for example, control the core network equipment to perform the operation shown in FIG. 7 .
  • S704 in FIG. 9 S900 in FIG. 9 , S900 , S1008 and S1009 in FIG. 10 , S1100 and S1101 in FIG. 11 , and/or actions performed by the terminal device in other processes described in the embodiments of this application.
  • the processing unit 1201 may communicate with other network entities through the communication unit 1202, for example, communicate with the terminal device and the first core network device shown in FIG. 2 .
  • the storage unit 1203 is used to store program codes and data of the core network device.
  • the communication apparatus 120 may be the core network equipment, or may be a chip in the core network equipment.
  • the processing unit 1201 may be a processor or a controller, and the communication unit 1202 may be a communication interface, a transceiver, a transceiver, a transceiver circuit, a transceiver device Wait.
  • the communication interface is a general term, which may include one or more interfaces.
  • the storage unit 1203 may be a memory.
  • the processing unit 1201 may be a processor or a controller, and the communication unit 1202 may be an input interface and/or an output interface, pins or circuits, etc. .
  • the storage unit 1203 may be a storage unit (for example, a register, a cache, etc.) in the chip, or a storage unit (for example, a read-only memory (ROM) located outside the chip in a terminal device, an access network device, or a core network device.
  • ROM read-only memory
  • RAM random access memory
  • the communication unit may also be referred to as a transceiver unit.
  • the antenna and control circuit with the transceiver function in the communication device 120 may be regarded as the communication unit 1202 of the communication device 120
  • the processor with the processing function may be regarded as the processing unit 1201 of the communication device 120 .
  • a device in the communication unit 1202 for implementing a receiving function may be regarded as a receiving unit, the receiving unit is used to perform the receiving steps in the embodiments of the present application, and the receiving unit may be a receiver, a receiver, a receiving circuit, or the like.
  • the integrated units in FIG. 12 may be stored in a computer-readable storage medium if implemented in the form of software functional modules and sold or used as independent products.
  • the medium includes several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to execute all or part of the steps of the methods described in the various embodiments of the present application.
  • Storage media for storing computer software products include: U disk, removable hard disk, read-only memory, random access memory, magnetic disk or optical disk and other media that can store program codes.
  • the units in FIG. 12 may also be referred to as modules, eg, a processing unit may be referred to as a processing module.
  • An embodiment of the present application also provides a schematic diagram of the hardware structure of a communication device (referred to as communication device 130 ).
  • the communication device 130 includes a processor 1301 , and optionally, also includes a connection with the processor 1301 of memory 1302.
  • the communication device 130 further includes a transceiver 1303 .
  • the processor 1301, the memory 1302 and the transceiver 1303 are connected by a bus.
  • the transceiver 1303 is used to communicate with other devices or communication networks.
  • the transceiver 1303 may include a transmitter and a receiver.
  • a device in the transceiver 1303 for implementing the receiving function may be regarded as a receiver, and the receiver is configured to perform the receiving steps in the embodiments of the present application.
  • a device in the transceiver 1303 for implementing the sending function may be regarded as a transmitter, and the transmitter is used to perform the sending step in the embodiment of the present application.
  • the schematic structural diagram shown in FIG. 13 may be used to illustrate the terminal device, the first access network device, the second access network device, and the third access network device involved in the foregoing embodiment. Or the structure of core network equipment.
  • the processor 1301 is used to control and manage the actions of the terminal equipment, for example, the processor 1301 is used to support the terminal equipment to execute the diagram S600 and S601 in Figure 6, S600, S601, S700, S701, S704 in Figure 7, S903 in Figure 9, S1000, S1001, S1006 and S903 in Figure 10, S1102 to S1106 in Figure 11, and/or Actions performed by the terminal device in other processes described in the embodiments of this application.
  • the processor 1301 may communicate with other network entities through the transceiver 1303, eg, with the first access network device and the second access network device shown in FIG. 2 .
  • the memory 1302 is used to store program codes and data of the terminal device.
  • the processor 1301 is used to control and manage the actions of the terminal device, for example, the processor 1301 is used to support
  • the first access network device executes S600 and S601 in FIG. 6, S600, S601, S700 to S703 in FIG. 7, S900, S901 and S902 in FIG. 9, and S900, S902, S1000 to S1003, and S1005 in FIG. 10 to S1007, and/or actions performed by the first access network device in other processes described in the embodiments of this application.
  • the processor 1301 may communicate with other network entities through the transceiver 1303, eg, with the terminal equipment and the access network equipment shown in FIG. 2 .
  • the memory 1302 is used to store program codes and data of the first access network device.
  • the processor 1301 is configured to control and manage the actions of the second access network device, for example, the processor 1301 is used to support the second access network device to perform S902 and S903 in FIG. 9, S902, S903, S1003 to S1005, S1008 and S1009 in FIG. 10, and/or in other processes described in the embodiments of this application. Actions performed by the second access network device.
  • the processor 1301 may communicate with other network entities through the transceiver 1303, for example, with the terminal equipment and the core network equipment shown in FIG. 2 .
  • the memory 1302 is used for storing program codes and data of the second access network device.
  • the processor 1301 is configured to control and manage the actions of the third access network device, for example, the processor 1301 is used to support the third access network device to perform S1101, S1102, S1105 and S1106 in FIG. 11, and/or actions performed by the third access network device in other processes described in the embodiments of this application.
  • the processor 1301 may communicate with other network entities through the transceiver 1303, for example, with the terminal equipment and core network equipment shown in FIG. 2 .
  • the memory 1302 is used for storing program codes and data of the third access network device.
  • the processor 1301 is used to control and manage the actions of the access network equipment.
  • the processor 1301 is used to support the access network equipment.
  • the network access device performs S704 in FIG. 7 , S900 in FIG. 9 , S900 , S1008 and S1009 in FIG. 10 , S1100 and S1101 in FIG. 11 , and/or connections in other processes described in the embodiments of this application.
  • the processor 1301 may communicate with other network entities through the transceiver 1303, for example, with the terminal equipment and the core network equipment shown in FIG. 1 .
  • the memory 1302 is used to store program codes and data of the access network equipment.
  • the processor 1301 includes a logic circuit and at least one of an input interface and an output interface. Wherein, the output interface is used for executing the sending action in the corresponding method, and the input interface is used for executing the receiving action in the corresponding method.
  • FIG. 14 Based on the second possible implementation manner, refer to FIG. 14 .
  • the schematic structural diagram shown in FIG. 14 may be used to illustrate the structure of the terminal device, access network device or core network device involved in the foregoing embodiment.
  • the processor 1301 is used to control and manage the actions of the terminal device, for example, the processor 1301 is used to support the terminal device to execute the diagram S600 and S601 in Figure 6, S600, S601, S700, S701, S704 in Figure 7, S903 in Figure 9, S1000, S1001, S1006 and S903 in Figure 10, S1102 to S1106 in Figure 11, and/or Actions performed by the terminal device in other processes described in the embodiments of this application.
  • the processor 1301 may communicate with other network entities, eg, with the first access network device and the second access network device shown in FIG. 2 , through at least one of the input interface and the output interface.
  • the memory 1302 is used to store program codes and data of the terminal device.
  • the processor 1301 is configured to control and manage the actions of the first access network device, for example, the processor 1301 is used to support the first access network device to perform S600 and S601 in FIG. 6, S600, S601, S700 to S703 in FIG. 7, S900, S901 and S902 in FIG. 9, S900, S902, S1000 in FIG. 10 to S1003, S1005 to S1007, and/or actions performed by the first access network device in other processes described in the embodiments of this application.
  • the processor 1301 may communicate with other network entities through at least one of the input interface and the output interface, for example, with the terminal device and the access network device shown in FIG. 1 .
  • the memory 1302 is used to store program codes and data of the first access network device.
  • the processor 1301 is configured to control and manage the actions of the second access network device, for example, the processor 1301 is used to support the second access network device to perform S902 and S903 in FIG. 9, S902, S903, S1003 to S1005, S1008 and S1009 in FIG. 10, and/or in other processes described in the embodiments of this application. Actions performed by the second access network device.
  • the processor 1301 may communicate with other network entities through at least one of the input interface and the output interface, for example, with the terminal device and the first access network device shown in FIG. 2 .
  • the memory 1302 is used for storing program codes and data of the second access network device.
  • the processor 1301 is configured to control and manage the actions of the third access network device, for example, the processor 1301 is used to support the third access network device to perform S1101, S1102, S1105 and S1106 in FIG. 11, and/or actions performed by the third access network device in other processes described in the embodiments of this application.
  • the processor 1301 may communicate with other network entities, for example, with the terminal device and the first access network device shown in FIG. 2, through at least one of the input interface and the output interface.
  • the memory 1302 is used for storing program codes and data of the third access network device.
  • the processor 1301 is used to control and manage the actions of the core network equipment, for example, the processor 1301 is used to support the core network equipment
  • the device performs S704 in FIG. 7 , S900 in FIG. 9 , S900 , S1008 and S1009 in FIG. 10 , S1100 and S1101 in FIG. 11 , and/or core network devices in other processes described in the embodiments of this application Action performed.
  • the processor 1301 may communicate with other network entities through at least one of the input interface and the output interface, for example, communicate with the terminal device and the first core network device shown in FIG. 2 .
  • the memory 1302 is used to store program codes and data of core network devices.
  • 13 and 14 may also illustrate a system chip in an access network device.
  • the above-mentioned actions performed by the access network device may be implemented by the system chip, and the specific actions performed may refer to the above, which will not be repeated here.
  • 13 and 14 may also illustrate a system chip in a terminal device.
  • the actions performed by the above-mentioned terminal device may be implemented by the system chip, and the specific actions performed may refer to the above, which will not be repeated here.
  • FIG. 13 and FIG. 14 may also illustrate a system chip in an access network device.
  • the actions performed by the above-mentioned first access network device may be implemented by the system chip, and the specific actions performed can refer to the above, and details are not described herein again.
  • an embodiment of the present application also provides a schematic diagram of the hardware structure of a terminal device (referred to as terminal device 150 ) and an access network device (referred to as access network device 160 ).
  • terminal device 150 may be a terminal device or a first access network device.
  • FIG. 15 is a schematic diagram of the hardware structure of the terminal device 150 .
  • the terminal device 150 includes a processor, a memory, a control circuit, an antenna, and an input and output device.
  • the processor is mainly used to process communication protocols and communication data, control the entire terminal equipment, execute software programs, and process data of the software programs. For example, control the terminal device to execute S600 and S601 in FIG. 6, S600, S601, S700, S701, S704 in FIG. 7, S903 in FIG. 9, S1000, S1001, S1006 and S903 in FIG. 11, S1102 to S1106.
  • the memory is mainly used to store software programs and data.
  • the control circuit (also referred to as a radio frequency circuit) is mainly used for the conversion of the baseband signal and the radio frequency signal and the processing of the radio frequency signal.
  • the control circuit together with the antenna can also be called a transceiver, which is mainly used to send and receive radio frequency signals in the form of electromagnetic waves.
  • Input and output devices such as touch screens, display screens, and keyboards, are mainly used to receive data input by users and output data to users.
  • the processor can read the software program in the memory, interpret and execute the instructions of the software program, and process the data of the software program.
  • the processor performs baseband processing on the data to be sent, and outputs the baseband signal to the control circuit in the control circuit.
  • the control circuit performs radio frequency processing on the baseband signal and sends the radio frequency signal through the antenna in the form of electromagnetic waves. send.
  • the control circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, which converts the baseband signal into data and processes the data.
  • FIG. 15 only shows one memory and one processor. In an actual terminal device, there may be multiple processors and memories.
  • the memory may also be referred to as a storage medium or a storage device, etc., which is not limited in this embodiment of the present application.
  • the processor may include a baseband processor and a central processing unit.
  • the baseband processor is mainly used to process communication protocols and communication data
  • the central processing unit is mainly used to control the entire terminal device, execute A software program that processes data from the software program.
  • the processor in FIG. 15 integrates the functions of the baseband processor and the central processing unit.
  • the baseband processor and the central processing unit may also be independent processors, interconnected by technologies such as a bus.
  • a terminal device may include multiple baseband processors to adapt to different network standards, a terminal device may include multiple central processors to enhance its processing capability, and various components of the terminal device may be connected through various buses.
  • the baseband processor can also be expressed as a baseband processing circuit or a baseband processing chip.
  • the central processing unit can also be expressed as a central processing circuit or a central processing chip.
  • the function of processing the communication protocol and communication data may be built in the processor, or may be stored in the memory in the form of a software program, and the processor executes the software program to realize the baseband processing function.
  • FIG. 16 is a schematic diagram of the hardware structure of the access network device 160 .
  • the access network device 160 may include one or more radio frequency units, such as a remote radio unit (remote radio unit, RRU for short) 1601 and one or more baseband units (baseband unit, BBU for short) (also referred to as a digital unit (digital unit). , referred to as DU)) 1602.
  • a remote radio unit remote radio unit
  • baseband unit baseband unit
  • BBU digital unit
  • DU digital unit
  • the RRU 1601 may be referred to as a transceiver unit, a transceiver, a transceiver circuit, or a transceiver, etc., which may include at least one antenna 1611 and a radio frequency unit 1612 .
  • the RRU1601 part is mainly used for the transceiver of radio frequency signal and the conversion of radio frequency signal and baseband signal.
  • the RRU 1601 and the BBU 1602 may be physically set together or physically separated, for example, distributed base stations.
  • the BBU1602 is the control center of the access network equipment, which can also be called a processing unit, and is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, and spread spectrum.
  • the BBU 1602 may be composed of one or more boards, and the multiple boards may jointly support a wireless access network (such as an LTE network) of a single access standard, or may respectively support wireless access systems of different access standards. Access network (such as LTE network, 5G network or other network).
  • the BBU 1602 also includes a memory 1621 and a processor 1622 for storing necessary instructions and data.
  • the processor 1622 is used to control the access network device to perform necessary actions.
  • the memory 1621 and processor 1622 may serve one or more single boards. That is to say, the memory and processor can be provided separately on each single board. It can also be that multiple boards share the same memory and processor. In addition, necessary circuits may also be provided on each single board.
  • the access network device 160 shown in FIG. 16 can perform S600 and S601 in FIG. 6 , S600, S601, S700 to S703 in FIG. 7 , S900, S901 and S902 in FIG. 9 , and S900 in FIG. 10 . and /or actions performed by the access network device in other processes described in the embodiments of this application.
  • the operations, functions, or, operations and functions of each module in the access network device 160 are respectively set to implement the corresponding processes in the foregoing method embodiments. For details, reference may be made to the descriptions in the foregoing method embodiments. To avoid repetition, the detailed descriptions are appropriately omitted here.
  • each step in the method provided in this embodiment may be completed by an integrated logic circuit of hardware in a processor or an instruction in the form of software.
  • the steps of the methods disclosed in conjunction with the embodiments of the present application may be directly embodied as executed by a hardware processor, or executed by a combination of hardware and software modules in the processor.
  • the processor in this application may include, but is not limited to, at least one of the following: a central processing unit (CPU), a microprocessor, a digital signal processor (DSP), a microcontroller (MCU), or Artificial intelligence processors and other types of computing devices that run software, each computing device may include one or more cores for executing software instructions to perform operations or processing.
  • the processor can be a separate semiconductor chip, or can be integrated with other circuits into a semiconductor chip. For example, it can form a SoC (on-chip) with other circuits (such as codec circuits, hardware acceleration circuits, or various bus and interface circuits).
  • the processor may further include necessary hardware accelerators, such as field programmable gate arrays (FPGA), PLDs (Programmable Logic Devices) , or a logic circuit that implements dedicated logic operations.
  • FPGA field programmable gate arrays
  • PLD Programmable Logic Devices
  • the memory in this embodiment of the present application may include at least one of the following types: read-only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory (random access memory) , RAM) or other types of dynamic storage devices that can store information and instructions, and can also be electrically erasable programmable read-only memory (Electrically erasable programmable read-only memory, EEPROM).
  • ROM read-only memory
  • RAM random access memory
  • EEPROM electrically erasable programmable read-only memory
  • the memory may also be compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compact disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.) , a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, without limitation.
  • CD-ROM compact disc read-only memory
  • optical disc storage including compact disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.
  • magnetic disk storage medium or other magnetic storage device or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, without limitation.
  • Embodiments of the present application further provide a computer-readable storage medium, including instructions, which, when executed on a computer, cause the computer to execute any of the foregoing methods.
  • Embodiments of the present application also provide a computer program product containing instructions, which, when run on a computer, enables the computer to execute any of the above methods.
  • An embodiment of the present application further provides a communication system, including: the above-mentioned terminal device, a first access network device, a second access network device, a core network device, and/or a third access network device.
  • An embodiment of the present application further provides a chip, the chip includes a processor and an interface circuit, the interface circuit is coupled to the processor, the processor is used to run a computer program or instructions to implement the above method, and the interface circuit is used to connect with the processor. communicate with other modules outside the chip.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • Computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website site, computer, server, or data center over a wire (e.g.
  • Coaxial cable, optical fiber, digital subscriber line (DSL) or wireless means to transmit to another website site, computer, server or data center.
  • Computer-readable storage media can be any available media that can be accessed by a computer or data storage devices including one or more servers, data centers, etc., that can be integrated with the media.
  • Useful media may be magnetic media (eg, floppy disk, hard disk, magnetic tape), optical media (eg, DVD), or semiconductor media (eg, solid state disk (SSD)), and the like.

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Abstract

本申请提供一种通信方法及装置，涉及通信技术领域，用于保证终端设备在小区切换过程中MBS的业务连续性。该方法包括：第一接入网设备将第一接入网设备和终端设备之间当前用于承载MBS的第一无线承载配置为用于承载单播业务的第二无线承载。第一接入网设备通过第二无线承载以单播的形式向终端设备发送MBS。这样，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按照当前切换单播业务的方式将MBS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多播广播传输方式导致的MBS终端的问题。

Description

通信方法及装置 技术领域
本申请涉及通信技术领域，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)是接入网设备向多个终端设备传输的业务，常见的MBS包括直播业务，公共安全业务，批量软件更新业务等。
如图1所示，在传输过程中，MBS依次通过MBS服务器，核心网设备，接入网设备传输至终端设备。其中，MBS服务器与核心网设备之间通过公共传输通道(MBS service)传输MBS。核心网设备与接入网设备之间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)。接入网设备与终端设备之间通过MBS无线承载(MBS radio bearer，MRB)传输MBS。MBS通常具有两种传输模式，分别为点到多点(point to multi-point，PTM)传输，以及点到点(point to point，PTP)传输方式。
在移动通信系统中，终端设备在移动过程中，随着各个小区的信号强度的变化，终端设备需要从一个小区切换到另一个小区，但是，目标基站不支持多播广播传输方式的情况，这将会导致终端设备在切换到目标基站的过程中，MBS无法继续通过多播广播方式接收，进而无法保证终端设备切换过程中MBS的业务连续性。
发明内容
本申请提供一种通信方法及装置，解决了现有技术中终端设备由支持多播广播传输方式的小区切换到不支持多播广播传输方式的小区时，导致无法保证MBS的业务连续性的问题。
为达到上述目的，本申请采用如下技术方案：
第一方面，提供一种通信方法，包括：终端设备接收第一指示信息，第一指示信息用于指示终端设备将第一无线承载配置为第二无线承载；第一无线承载为多播无线承载，第二无线承载为单播无线承载。
终端设备通过第二无线承载接收MBS。
基于上述技术方案，在终端设备需要由支持多播广播传输方式的第一接入网设备切换至不支持多播广播传输方式的第二接入网设备的情况下，第一接入网设备将第一接入网设备和终端设备之间当前用于承载MBS的第一无线承载配置为用于承载单播业务的第二无线承载。第一接入网设备通过第二无线承载以单播的形式向终端设备发送MBS。
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，因此在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按照当前切换单播业务的方式将MBS切换到第二接入网设备即可。解决了由于第二接入网设备不支持多播广播传输方式导致的MBS终端的问题。
结合上述第一方面，在一种可能的实现方式中，第一指示信息具体用于指示第二 无线承载的以下至少一项信息：分组数据汇聚层协议(packet data convergence protocol，PDCP)配置信息，无线链路控制(radio link control，RLC)配置信息，安全配置信息，以及第二无线承载的标识。
基于此，终端设备可以根据第一指示信息，确定第二无线承载的配置信息，以便于终端设备根据这些配置信息配置第二无线承载。
结合上述第一方面，在一种可能的实现方式中，第二无线承载沿用第一无线承载的以下至少一项配置信息：PDCP配置信息，PTP RLC配置信息。
基于此，第二无线承载沿用第一无线承载的PDCP配置信息和/或PTP RLC配置信息，可以使终端设备配置第二无线承载时无需对PDCP配置和RLC配置进行重配置，降低了终端设备实现的复杂度。
结合上述第一方面，在一种可能的实现方式中，第二无线承载对应的PDCP实体沿用第一无线承载对应的PDCP实体的传输窗的传输状态以及传输参数。
基于此，可以保证重配置之后PDCP实体的一致性，降低因重配置导致的数据包丢失的情况。
第二方面，提供一种通信方法，包括：第一接入网设备发送第一指示信息，第一指示信息用于指示终端设备将第一无线承载配置为第二无线承载；第一无线承载为多播无线承载，第二无线承载为单播无线承载。第一接入网设备通过第二无线承载发送MBS。
结合上述第二方面，在一种可能的实现方式中，第一指示信息具体用于指示第二无线承载的以下至少一项信息：PDCP配置信息，RLC配置信息，安全配置信息，以及第二无线承载的标识。
结合上述第二方面，在一种可能的实现方式中，第二无线承载沿用第一无线承载的以下至少一项配置信息：PDCP配置信息，PTP RLC配置信息。
结合上述第二方面，在一种可能的实现方式中，第二无线承载对应的PDCP实体沿用第一无线承载对应的PDCP实体的传输窗的传输状态以及传输参数。
结合上述第二方面，在一种可能的实现方式中，该方法还包括：第一接入网设备发送第二指示信息，第二指示信息用于指示核心网设备通过与终端设备对应的单播会话或者单播服务质量流向第一接入网设备发送MBS。
基于此，在第一接入网设备与终端设备之间采用单播的形式传输MBS的情况下，第一接入网设备与核心网设备之间同样采用单播的形式传输MBS，可以增加核心网设备，第一接入网设备与终端设备之间传输MBS的一致性。
结合上述第二方面，在一种可能的实现方式中，第二指示信息还用于指示数据包序列号，数据包序列号为核心网设备通过单播会话或者单播服务质量流发送的MBS的第一个数据包的序列号。
基于此，第一接入网设备通过可以数据包序列号指示核心网从哪个数据包开始采用单播会话或者单播服务质量流发送的MBS。
第三方面，提供一种通信方法，包括：第一接入网设备接收第三指示信息；第三指示信息用于指示单播服务质量流与MBS服务质量流的关联关系。
在切换过程中，第一接入网设备根据第三指示信息，将MBS服务质量流映射为单 播服务质量流。
第一接入网设备转发单播服务质量流。
基于上述技术方案，在终端设备向第二接入网设备进行切换之前，第一接入网设备与终端设备之间保持多播的形式传输MBS，在终端设备进行小区切换的过程中，第一接入网设备指示终端设备以单播的形式与第二接入网之间传输MBS。在切换之后，终端设备与第二接入网设备之间以单播的形式传输MBS。第一接入网设备将未发送的MBS以单播的形式发送给第二接入网设备。
这样，可以保证终端设备切换到第二接入网设备之后，采用单播的形式传输MBS。该方法保证了终端设备切换到第二接入网设备之后，仍能够正确传输MBS。此外，该切换流程与现有的切换流程相似，便于实现，且能够保证终端设备接收MBS的连续性。
结合上述第三方面，在一种可能的实现方式中，第三指示信息包括以下至少一项：MBS服务质量流对应的单播服务质量流的流标识，单播服务质量流的QoS参数。
基于此，接入网设备可以根据第三指示信息确定MBS服务质量流对应的单播服务质量流，以及该单播服务质量流的参数信息。
第四方面，提供一种通信方法，包括：终端设备接收第四指示信息，第四指示信息用于指示终端设备将第二无线承载配置为第一无线承载；第一无线承载为多播无线承载，第二无线承载为单播无线承载。
终端设备通过第一无线承载接收MBS。
基于上述技术方案，本申请实施例提供了一种通信方法，在终端设备由不支持多播广播传输方式的接入网设备切换到支持多播广播传输方式的接入网设备的情况下，若终端设备与接入网设备之间以单播的形式传输MBS，则将该MBS映射到以多播传输的MBS中。解决了于重复传输MBS导致的传输资源浪费的问题。
结合上述第四方面，在一种可能的实现方式中，该方法还包括：终端设备将第一无线承载对应的PDCP实体中的数据包递交至高层协议实体中。
基于此，终端设备可以在重配置之前将PDCP实体中的数据包递交至高层协议实体中，避免重配置PDCP实体的过程中PDCP实体中的数据丢失。
结合上述第四方面，在一种可能的实现方式中，该方法还包括：终端设备执行以下至少一种操作，将第二无线承载配置为第一无线承载：建立PTM RLC实体，配置MBS标识，删除第二无线承载配置中的安全配置。
基于此，终端设备可以通过在第二无线承载中配置PTP RLC实体，和/或配置MBS网标识，和/或删除第二无线承载配置中的安全配置，得到第一无线承载。
结合上述第四方面，在一种可能的实现方式中，该方法还包括：终端设备向第三接入网设备发送第五指示信息，第五指示信息用于指示终端设备未成功接收到的数据包对应的序列号。
基于此，第三接入网设备可以根据未成功接收到的数据包对应的序列号，确定重配置无线承载之后需要向终端设备发送的数据包。
第五方面，提供一种通信装置，包括：通信单元和处理单元。
处理单元，用于指示通信单元接收第一指示信息，第一指示信息用于指示终端设备将第一无线承载配置为第二无线承载；第一无线承载为多播无线承载，第二无线承 载为单播无线承载。
处理单元，还用于指示通信单元通过第二无线承载接收MBS。
结合上述第五方面，在一种可能的实现方式中，第一指示信息具体用于指示第二无线承载的以下至少一项信息：PDCP配置信息，RLC配置信息，安全配置信息，以及第二无线承载的标识。
结合上述第五方面，在一种可能的实现方式中，第二无线承载沿用第一无线承载的以下至少一项配置信息：PDCP配置信息，点到点PTP RLC配置信息。
结合上述第五方面，在一种可能的实现方式中，第二无线承载对应的PDCP实体沿用第一无线承载对应的PDCP实体的传输窗的传输状态以及传输参数。
第六方面，提供一种通信装置，包括：通信单元和处理单元。
处理单元，用于指示通信单元发送第一指示信息，第一指示信息用于指示终端设备将第一无线承载配置为第二无线承载；第一无线承载为多播无线承载，第二无线承载为单播无线承载。
处理单元，还用于指示通信单元通过第二无线承载发送MBS。
结合上述第六方面，在一种可能的实现方式中，第一指示信息具体用于指示第二无线承载的以下至少一项信息：PDCP配置信息，RLC配置信息，安全配置信息，以及第二无线承载的标识。
结合上述第六方面，在一种可能的实现方式中，第二无线承载沿用第一无线承载的以下至少一项配置信息：PDCP配置信息，PTP RLC配置信息。
结合上述第六方面，在一种可能的实现方式中，第二无线承载对应的PDCP实体沿用第一无线承载对应的PDCP实体的传输窗的传输状态以及传输参数。
结合上述第六方面，在一种可能的实现方式中，处理单元，还用于指示通信单元发送第二指示信息，第二指示信息用于指示核心网设备通过与终端设备对应的单播会话或者单播服务质量流向第一接入网设备发送MBS。
结合上述第六方面，在一种可能的实现方式中，第二指示信息还用于指示数据包序列号，数据包序列号为核心网设备通过单播会话或者单播服务质量流发送的MBS的第一个数据包的序列号。
第七方面，提供一种通信装置，包括：通信单元和处理单元。
处理单元，用于指示通信单元接收第三指示信息；第三指示信息用于指示单播服务质量流与MBS服务质量流的关联关系。
处理单元，还用于在切换过程中，根据第三指示信息将MBS服务质量流映射为单播服务质量流。
处理单元，还用于指示通信单元转发单播服务质量流。
结合上述第七方面，在一种可能的实现方式中，第三指示信息包括以下至少一项：MBS服务质量流对应的单播服务质量流的流标识，单播服务质量流的QoS参数。
第八方面，提供一种通信装置，包括：通信单元和处理单元。
处理单元，用于指示通信单元接收第四指示信息，第四指示信息用于指示终端设备将第二无线承载配置为第一无线承载；第一无线承载为多播无线承载，第二无线承载为单播无线承载。
处理单元，还用于指示通信单元通过第一无线承载接收MBS。
结合上述第八方面，在一种可能的实现方式中，处理单元，还用于：
将第一无线承载对应的PDCP实体中的数据包递交至高层协议实体中。
第九方面，本申请提供了一种通信装置，包括：处理器和存储介质；至少一个处理器和接口电路，接口电路用于接收来自通信装置之外的其它通信装置的信号并传输至处理器或将来自处理器的信号发送给通信装置之外的其它通信装置，处理器通过逻辑电路或执行代码指令用于实现如第一方面和第一方面的任一种可能的实现方式中所描述的方法。该通信装置可以是终端设备，也可以是终端设备中的芯片。
第十方面，本申请提供了一种通信装置，包括：处理器和存储介质；至少一个处理器和接口电路，接口电路用于接收来自通信装置之外的其它通信装置的信号并传输至处理器或将来自处理器的信号发送给通信装置之外的其它通信装置，处理器通过逻辑电路或执行代码指令用于实现如第二方面和第二方面的任一种可能的实现方式中所描述的方法。该通信装置可以是接入网设备，也可以是接入网设备中的芯片。
第十一方面，本申请提供了一种通信装置，包括：处理器和存储介质；至少一个处理器和接口电路，接口电路用于接收来自通信装置之外的其它通信装置的信号并传输至处理器或将来自处理器的信号发送给通信装置之外的其它通信装置，处理器通过逻辑电路或执行代码指令用于实现如第三方面和第三方面的任一种可能的实现方式中所描述的方法。该通信装置可以是接入网设备，也可以是接入网设备中的芯片。
第十二方面，本申请提供了一种通信装置，包括：处理器和存储介质；至少一个处理器和接口电路，接口电路用于接收来自通信装置之外的其它通信装置的信号并传输至处理器或将来自处理器的信号发送给通信装置之外的其它通信装置，处理器通过逻辑电路或执行代码指令用于实现如第四方面和第四方面的任一种可能的实现方式中所描述的方法。该通信装置可以是终端设备，也可以是终端设备中的芯片。
第十三方面，本申请提供了一种计算机可读存储介质，计算机可读存储介质中存储有指令，当该指令在计算机上运行时，使得计算机执行如第一方面和第一方面的任一种可能的实现方式中所描述的方法。
第十四方面，本申请提供了一种计算机可读存储介质，计算机可读存储介质中存储有指令，当该指令在计算机上运行时，使得计算机执行如第二方面和第二方面的任一种可能的实现方式中所描述的方法。
第十五方面，本申请提供了一种计算机可读存储介质，计算机可读存储介质中存储有指令，当该指令在计算机上运行时，使得计算机执行如第三方面和第三方面的任一种可能的实现方式中所描述的方法。
第十六方面，本申请提供了一种计算机可读存储介质，计算机可读存储介质中存储有指令，当该指令在计算机上运行时，使得计算机执行如第四方面和第四方面的任一种可能的实现方式中所描述的方法。
第十七方面，本申请提供一种包含指令的计算机程序产品，当该计算机程序产品在计算机上运行时，使得计算机执行如第一方面和第一方面的任一种可能的实现方式中所描述的方法。
第十八方面，本申请提供一种包含指令的计算机程序产品，当该计算机程序产品 在计算机上运行时，使得计算机执行如第二方面和第二方面的任一种可能的实现方式中所描述的方法。
第十九方面，本申请提供一种包含指令的计算机程序产品，当该计算机程序产品在计算机上运行时，使得计算机执行如第三方面和第三方面的任一种可能的实现方式中所描述的方法。
第二十方面，本申请提供一种包含指令的计算机程序产品，当该计算机程序产品在计算机上运行时，使得计算机执行如第四方面和第四方面的任一种可能的实现方式中所描述的方法。
应当理解的是，本申请中对技术特征、技术方案、有益效果或类似语言的描述并不是暗示在任意的单个实施例中可以实现所有的特点和优点。相反，可以理解的是对于特征或有益效果的描述意味着在至少一个实施例中包括特定的技术特征、技术方案或有益效果。因此，本说明书中对于技术特征、技术方案或有益效果的描述并不一定是指相同的实施例。进而，还可以任何适当的方式组合本实施例中所描述的技术特征、技术方案和有益效果。本领域技术人员将会理解，无需特定实施例的一个或多个特定的技术特征、技术方案或有益效果即可实现实施例。在其他实施例中，还可在没有体现所有实施例的特定实施例中识别出额外的技术特征和有益效果。
附图说明
图1为本申请提供的一种MBS传输过程的示意图；
图2为本申请实施例提供的一种通信系统的系统架构图；
图3为本申请实施例提供的又一种通信系统的系统架构图；
图4为本申请实施例提供的一种用户面协议栈的架构示意图；
图5为本申请实施例提供的一种小区测量及切换的方法的流程示意图；
图6为本申请实施例提供的一种通信方法的流程示意图；
图7为本申请实施例提供的又一种通信方法的流程示意图；
图8为本申请实施例提供的一种MRB与DRB的配置示意图；
图9为本申请实施例提供的又一种通信方法的流程示意图；
图10为本申请实施例提供的又一种通信方法的流程示意图；
图11为本申请实施例提供的又一种通信方法的流程示意图；
图12为本申请实施例提供的一种通信装置的结构示意图；
图13为本申请实施例提供的一种通信装置的硬件结构示意图；
图14为本申请实施例提供的一种通信装置的硬件结构示意图；
图15为本申请实施例提供的一种终端设备的硬件结构示意图；
图16为本申请实施例提供的一种接入网设备的硬件结构示意图。
具体实施方式
在本申请的描述中，除非另有说明，“/”表示“或”的意思，例如，A/B可以表示A或B。本文中的“和/或”仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。此外，“至少一个”是指一个或多个，“多个”是指两个或两个以上。“第一”、“第二”等字样并不对数量和执行次序进行限定，并且“第一”、“第二”等字样也并 不限定一定不同。
需要说明的是，本申请中，“示例性的”或者“例如”等词用于表示作例子、例证或说明。本申请中被描述为“示例性的”或者“例如”的任何实施例或设计方案不应被解释为比其他实施例或设计方案更优选或更具优势。确切而言，使用“示例性的”或者“例如”等词旨在以具体方式呈现相关概念。
本申请实施例中的通信系统包括但不限于长期演进(long term evolution，LTE)系统、第五代(5th-generation，5G)系统、新空口(new radio，NR)系统，无线局域网(wireless local area networks，WLAN)系统以及未来演进系统或者多种通信融合系统。其中，4G系统也可以称为演进分组系统(evolved packet system，EPS)。4G系统的核心网可以称为演进分组核心网(evolved packet core，EPC)，接入网可以称为长期演进(long term evolution，LTE)。5G系统的核心网可以称为5GC(5G core)，接入网可以称为新无线(new radio，NR)。为了方便描述，下文中以本申请应用于5G系统为例对本申请作示例性说明，但是可以理解的是，本申请同样适用于4G系统，第三代(3th Generation，3G)系统等，不作限制。示例性的，本申请实施例提供的方法具体可应用于演进的全球陆地无线接入网络(evolved-universal terrestrial radio access network，E-UTRAN)和下一代无线接入网(next generation-radio access network，NG-RAN)系统。
本申请实施例中的接入网设备为网络侧的一种用于发送信号，或者，接收信号，或者，发送信号和接收信号的实体。接入网设备可以为部署在无线接入网(radio access network，RAN)中为终端设备提供无线通信功能的装置，例如可以为TRP、基站(例如，演进型基站(evolved NodeB，eNB或eNodeB)、下一代基站节点(next generation node base station，gNB)、下一代eNB(next generation eNB，ng-eNB)等)、各种形式的控制节点(例如，网络控制器、无线控制器(例如，云无线接入网络(cloud radio access network，CRAN)场景下的无线控制器))、路侧单元(road side unit，RSU)等。具体的，接入网设备可以为各种形式的宏基站，微基站(也称为小站)，中继站，接入点(access point，AP)等，也可以为基站的天线面板。所述控制节点可以连接多个基站，并为所述多个基站覆盖下的多个终端设备配置资源。在采用不同的无线接入技术(radio access technology，RAT)的系统中，具备基站功能的设备的名称可能会有所不同。例如，LTE系统中可以称为eNB或eNodeB，5G系统或NR系统中可以称为gNB，本申请对基站的具体名称不作限定。接入网设备还可以是未来演进的公共陆地移动网络(public land mobile network，PLMN)中的接入网设备等。
本申请实施例中的终端设备是用户侧的一种用于接收信号，或者，发送信号，或者，接收信号和发送信号的实体。终端设备用于向用户提供语音服务和数据连通性服务中的一种或多种。终端设备还可以称为用户设备(user equipment，UE)、终端、接入终端、用户单元、用户站、移动站、远方站、远程终端、移动设备、用户终端、无线通信设备、用户代理或用户装置。终端设备可以是车联网(vehicle to everything，V2X)设备，例如，智能汽车(smart car或intelligent car)、数字汽车(digital car)、无人汽车(unmanned car或driverless car或pilotless car或automobile)、自动汽车(self-driving car或autonomous car)、纯电动汽车(pure EV或Battery EV)、混合动 力汽车(hybrid electric vehicle，HEV)、增程式电动汽车(range extended EV，REEV)、插电式混合动力汽车(plug-in HEV，PHEV)、新能源汽车(new energy vehicle)等。终端设备也可以是设备到设备(device to device，D2D)设备，例如，电表、水表等。终端设备还可以是移动站(mobile station，MS)、用户单元(subscriber unit)、无人机、物联网(internet of things，IoT)设备、WLAN中的站点(station，ST)、蜂窝电话(cellular phone)、智能电话(smart phone)、无绳电话、无线数据卡、平板型电脑、会话启动协议(session initiation protocol，SIP)电话、无线本地环路(wireless local loop，WLL)站、个人数字处理(personal digital assistant，PDA)设备、膝上型电脑(laptop computer)、机器类型通信(machine type communication，MTC)终端、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备(也可以称为穿戴式智能设备)。终端设备还可以为下一代通信系统中的终端设备，例如，5G系统中的终端设备或者未来演进的PLMN中的终端设备，NR系统中的终端设备等。
本申请实施例提供的通信方法，可以应用于如图2所示的通信系统100中，如图2所示，该通信系统100包括：MBS服务器10、核心网设备20、第一接入网设备30、第二接入网设备40、终端设备50。
其中，所述MBS服务器10用于提供MBS。
核心网设备20用于接收来自MBS服务器的MBS，并向接入网设备(第一接入网设备或者第二接入网设备)发送该MBS。
第一接入网设备30为终端设备50当前接入的接入网设备(即源基站)。第一接入网设备30用于在终端设备进行小区切换之前为终端设备提供网络服务。例如，在小区切换之前，第一接入网设备30用于接收来自核心网设备20的MBS，并向终端设备50发送该MBS。
第二接入网设备40为终端设备50待切换的接入网设备(即目标基站)。第二接入网设备用于在终端设备进行小区切换之后，为终端设备提供网络服务。例如，在小区切换之后，第二接入网设备40用于接收来自核心网设备20的MBS，并向终端设备50发送该MBS。
终端设备50用于与接入网设备通信，接收来自接入网设备的数据，或者向接入网设备发送数据。例如，终端设备50用于接收来自接入网设备的MBS。
在本申请实施例中，第一接入网设备为支持多播广播传输方式的接入网设备，第二接入网设备为不支持多播广播传输方式的接入网设备。核心网设备与第一接入网设备之间通过MBS会话传输MBS，核心网设备与第二接入网设备之间通过单播PDU会话传输MBS。第一接入网设备和终端设备之间通过多播无线承载(MRB)传输MBS，通过单播无线承载传输单播业务。第二接入网设备与终端设备之间通过单播无线承载传输单播业务。
结合图2，如图3所示，终端设备可以为任意具有接收数据和/或发送数据功能的终端设备，例如图3中所示出的手机，车辆，物联网设备等。此外，终端设备还可以为图3中未示出的公共安全设备等具有接收数据能力的设备，本申请对终端设备的类型不做限定。
当前，终端设备与接入网设备通信时，终端设备和接入网设备之间具有相应的协议栈结构，终端设备和接入网设备根据该协议栈结构进行通信。
一种示例，终端设备和接入网设备所使用的用户面协议栈结构包括：无线资源控制(radio resource control，RRC)层、业务数据适配(service data adaptation protocol,SDAP)层、PDCP层、RLC层、媒体接入控制(media Access Link control，MAC)和物理(physical，PHY)层。其中，PHY层位于最底层(层一)，MAC层、RLC层、PDCP层以及SDAP层属于第二层(层二)，RRC层属于第三层(层三)。
如图4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，SDAP层位于PDCP层之上。
MBS通常为接入网设备向终端设备发送的业务，因此在传输MBS时，MBS的传输流程为：
MBS首先到达第一接入网设备的SDAP层；经过SDAP层的映射以后，传输到相应的PDCP实体；经过第一接入网设备的PDCP层的处理以后传输到RLC层和MAC层；经过相应的处理之后，从PHY层发送出去，通过空口传输给终端设备。
终端设备的各个协议层按照与第一接入网设备相反的处理顺序对数据包依次进行对应的处理。
在第一接入网设备和终端设备侧可以形象地将各层对数据包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，比如PDCP层的PDCP实体。
每个无线承载配置里面会包含一个PDCP实体，同时无线承载配置会关联至少一个RLC实体，并且每个RLC实体对应一个逻辑信道。
以上，对终端设备和接入网设备之间的协议栈结构进行了说明。
在当前的移动通信系统中，存在多个小区覆盖同一个位置的情况，在终端设备位于多个小区覆盖的同一个位置的情况下，终端设备需要选择接入信号强度最强的小区。这样，终端设备在信号强度最强的小区上传输业务数据，从而提高终端设备的数据传输质量。
在终端设备移动的过程中，终端设备接收到的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。
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，则终端设备需要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切换流程，将终端设备从小区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，保证终端设备业务的传输质量。
如图5所示，当前，终端设备和第一接入网设备进行小区测量以及切换的方法包括以下步骤1-步骤10：
步骤1、终端设备接入到第一接入网设备。
其中，第一接入网设备可以为上述小区A。
一种可能的实现方式中，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。
步骤2、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。
一种可能的实现方式中，测量配置参数承载在第一接入网设备向终端设备发送RRC重配置(RRCReconfiguration)消息中。也即是说，第一接入网设备向终端设备发送的RRC重配置消息中包括测量配置参数(MeasConfig)。
本申请实施例所记载的测量配置参数包括以下至少一项：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。
其中，测量频点/小区信息，用于指示待测量的小区，以及小区对应的频点。测量频点/小区信息中包括终端设备当前接入的小区的信息。或者，测量频点小区信息中可以只包括需要测量的频点信息，此时，当前接入小区的信息可以通过RRC重配置消息指示。
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，用于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滤波，确定小区的测量结果。
步骤3、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。
举例来说，测量配置参数指示需要测量的小区包括小区A和小区B。
终端设备根据测量配置参数中的频点配置或者小区配置信息，启动物理(physical，PHY)层测量小区A的信号强度，终端设备的PHY层向终端设备的RRC层发送小区A信号强度。终端设备的RRC层根据小区A的信号强度，小区A的前一次的测量结果，以及滤波系数，确定小区A的测量结果。
终端设备根据测量配置参数中的频点配置或者小区配置信息，启动物理层测量小区B的信号强度，终端设备的PHY层向终端设备的RRC层发送小区B信号强度。终端设备的RRC层根据小区B的信号强度，小区B的前一次的测量结果，以及滤波系数，确定小区B的测量结果。
具体来说，对于小区A，终端设备执行以下步骤3.1-步骤3.3，确定小区A的测量结果。
步骤3.1、终端设备启动物理(physical，PHY)层测量小区A的参考信号，确定小区A当前的信号强度。
其中，小区A的信号强度包括但不限于以下至少一项：参考信号接收功率(reference signal receiving power，RSRP)值；参考信号接收质量(reference signal receiving quality，RSRQ)值；信号与干扰加噪声比(signal to interference plus noise ratio， SINR)值，接收信号强度指示(received signal strength indication，RSSI)。
步骤3.2、终端设备确定小区A的前一次的测量结果。
其中，小区A的前一次的测量结果根据终端设备前一次确定的小区A的信号强度，以及滤波参数确定，其具体实现方式与终端设备确定小区A当前的测量结果的方法类似，本申请不在赘述。
步骤3.3、终端设备根据公式1，小区A当前的信号强度，以及小区A的前一次的测量结果，确定小区A测量结果。
需要指出的是，如果终端设备是第一次测量小区A的信号强度，则终端设备直接将步骤3.1中测量的结果作为小区A的测量结果，而无需根据上述步骤3.1-步骤3.3中记录的方法确定最终测量结果。
对于小区B，终端设备执行与上述步骤3.1-步骤3.3类似的方式，确定小区B的测量结果。
步骤4、终端设备根据测量结果，确定测量报告。
具体来说，在步骤3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层生成相应的测量报告，向第一接入网设备发送该测量报告。
一种可能的实现方式中，测量报告用于向接入网设备报告测量事件。
示例1，终端设备确定的需要上报的测量事件包括：
A1：服务小区测量结果高于门限a 1。
A2：服务小区测量结果低于门限a 2。
A3：邻区测量结果高于服务小区测量结果+偏移值(offset)。
A4：邻区测量结果高于门限a 3。
A5：服务小区测量结果低于门限a 4，并且邻区测量结果高于门限a 5。
A6：邻区测量结果高于Scell的测量结果+偏移值(offset)。
B1：异系统小区测量结果高于门限a 6。
B2：异系统小区测量结果高于门限a 7，SPcell测量结果低于门限a 8。
其中，上述服务小区为小区A，邻区即为小区B。终端设备根据小区A和小区B的测量结果确定小区A和小区B的测量结果是否满足需要上报的测量事件，若满足某一需要上报的测量事件，则终端设备生成与该事件对应的测量报告。
可以理解的是，需要上报的事件还可以包括其他类型的事件，本申请对此不做限定。
需要指出的是，终端设备可以根据接入网设备发送的测量配置中的MeasIdList，确定需要上报的测量事件。MeasIdList用于关联频点/小区信息与需要上报的测量事件以及测量上报条件。
例如，终端设备需要上报的测量事件包括上述A3事件，在终端设备确定当前的测量结果满足A3事件的情况下，终端设备生成与A3事件对应的测量报告。
需要指出的是，终端设备生成测量报告中通常只包括一个需要上报的测量事件。在需要上报的测量事件包括多个，且终端设备确定当前的测量结果同时满足多个需要 上报的测量事件的情况下，终端设备为每一个需要上报的测量事件生成对应的测量报告，并逐一向接入网设备发送这些测量报告。
步骤5、终端设备向第一接入网设备发送测量报告，相应的，终端设备接收来自第一接入网设备的测量报告。
步骤6、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。
需要指出的是，第一接入网设备也称为源基站，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基站，对应于上述步骤3中记载的小区B。
步骤7、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)。相应的，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。
一种可能的实现方式中，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，第二接入网设备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，第二接入网设备向第一接入网设备发送切换请求确认信息。
一种示例，上述切换请求确认信息中包括以下至少一项：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。
步骤8、第一接入网设备向终端设备发送RRC重配置消息。相应的，终端设备接收来自第一接入网设备的RRC重配置消息。
其中，RRC重配置消息中包括：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8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。
一种可能的实现方式中，在第一接入网设备和第二接入网设备中至少一个为NR系统中的接入网设备的情况下，该RRC重配置消息中包括以下至少一项：第二接入网设备的相关信息，以及终端设备接入第二接入网设备所需的配置参数。
具体来说，RRC重配置消息中包括以下至少一项：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)。
步骤9、终端设备向第二接入网设备发起随机接入。
需要指出的是，当前终端设备向第二接入网设备发起随机接入时，终端设备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。
步骤10、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1-步骤10，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，那么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多播广播传输方式，因此终端设备无法继续通过多播广播传输方式从第二接入网设备接收MBS，这将会无法保证MBS的业务连续性。
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多播广播传输方式的第一接入网设备切换至不支持多播广播传输方式的第二接入网设备的情况下，保证MBS业务的连续性。
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多播广播传输方式，在第二接入网设备不支持多播广播传输方式的情况下，第一接入网设备指示终端设备将承载MBS的第一无线承载配置为承载单播业务的第二无线承载。相应的，终端设备将第一无线承载配置为第二无线承载。在此之后，终端设备与第一接入网设备之间通过第二无线承载传输MBS。
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，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按照当前切换单播业务的方式将MBS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多播广播传输方式导致的MBS终端的问题。
本申请实施例提供的通信方法，应用于如图2所示的通信系统中。如图6所示，该通信方法包括：
S600、第一接入网设备向终端设备发送第一指示信息。相应的，终端设备接收来自第一接入网设备的第一指示信息。
其中，第一指示信息用于指示终端设备将第一无线承载配置为第二无线承载；第一无线承载为多播无线承载，第二无线承载为单播无线承载。
需要指出的是，第一接入网设备为支持多播广播传输方式的接入网设备。第一接入网设备在发送第一指示信息之前，接收到来自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多播广播传输方式的接入网设备。
一种可能的实现方式中，第一指示信息具体用于指示第二无线承载的以下至少一项信息：PDCP配置信息，RLC配置信息，安全配置信息，以及第二无线承载的标识。
其中，终端设备可以根据第二无线承载的标识与第一无线承载的标识相同，来确定本次配置的第二无线承载是基于第一无线承载配置的。
又一种可能的实现方式中，第二无线承载沿用第一无线承载的以下至少一项配置信息：PDCP配置信息，PTP RLC配置信息。第二无线承载对应的PDCP实体沿用第一无线承载对应的PDCP实体的传输窗的传输状态以及传输参数。其中传输窗的传输状态以及传输参数包括以下至少一种：当前发送的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。
具体来说，在第二无线承载沿用第一无线承载的PDCP配置信息，PTP RLC配置信息的至少一项的情况下，第一指示信息中包括第一标识，该第一标识用于指示终端设备沿用PDCP配置信息和PTP RLC配置信息中的至少一项。
例如，第一指示信息中包括两个比特，分别用于指示是否沿用第一无线承载的PDCP配置信息和/或PTP RLC配置信息，当比特的值为0是指示沿用，当比特的值为1时指示不沿用。
一种示例，在该两个比特的值为“00”时，第一指示信息用于指示终端设备即不沿用第一无线承载的PDCP配置信息，又不沿用第一无线承载的PTP RLC配置信息。
在该两个比特的值为“01”时，第一指示信息用于指示终端设备不沿用第一无线承载的PDCP配置信息，沿用第一无线承载的PTP RLC配置信息。
在该两个比特的值为“10”时，第一指示信息用于指示终端设备沿用第一无线承载的PDCP配置信息，不沿用第一无线承载的PTP RLC配置信息。
在该两个比特的值为“11”时，第一指示信息用于指示终端设备即沿用第一无线承载的PDCP配置信息，又沿用第一无线承载的PTP RLC配置信息。
又例如，第一指示信息用于指示本次配置是一种特殊类型的配置，并在协议中约定好，当终端设备接收到这种类型的配置以后，沿用之前无线承载的PDCP配置信息和PTP RLC配置信息中的至少一项。
S601、第一接入网设备通过第二无线承载向终端设备发送MBS。相应的，终端设备接收第一接入网设备通过第二无线承载发送的MBS。
一种可能的实现方式中，第一无线承载为MBS无线承载(MBS radio bearer，MRB)。第二无线承载为数据无线承载(data radio bearer，DRB)。以下，将以第一无线承载为MRB，第二无线承载为DRB为例进行说明。
在S601之后，终端设备，第一接入网设备以及第二接入网设备可以根据上述图5中的步骤6-步骤10中记载方案进行小区切换。终端设备切换到第二接入网设备之后，采用单播的形式传输上述MBS。
基于上述技术方案，在终端设备需要由支持多播广播传输方式的第一接入网设备切换至不支持多播广播传输方式的第二接入网设备的情况下，第一接入网设备将第一接入网设备和终端设备之间当前用于承载MBS的第一无线承载配置为用于承载单播业务的第二无线承载。第一接入网设备通过第二无线承载以单播的形式向终端设备发送MBS。
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，因此在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按照当前切换单播业务的方式将MBS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多播广播传输方式导致的MBS终端的问题。
一种可能的实现方式中，结合图6，如图7所示，在S600之前，本申请实施例提供的方法还包括以下S700-S703，下面进行具体说明：
S700、核心网设备向第一接入网设备发送MBS。相应的，第一接入网设备接收来自核心网设备的MBS。
具体来说，终端设备接入第一接入网设备之后，若终端设备与第一接入网设备之间需要传输MBS，则在传输MBS之前，核心网设备发起MBS session(MBS会话)或者MBS flow建立/修改请求，以使得核心网设备和第一接入网设备之间建立用于传输MBS的传输通道。核心网设备通过该建立好的传输通道向第一接入网设备传输MBS。
第一接入网设备与终端设备之间建立第一无线承载(MRB)，第一接入网设备与终端设备之间通过该第一无线承载传输MBS。
S701、终端设备向第一接入网设备发送测量报告。
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终端设备进行小区切换之前，需要先指示终端设备将第一无线承载配置为第二无线承载，并通过第二无线承载传输MBS。因此，终端设备进行小区切换需要的时间将会增加。为了避免终端设备进行小区切换的时间过长导致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终端设备提前上报测量报告的方法，以使得终端设备有足够的时间进行小区切换。
一种可能的实现方式中，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终端设备提前触发并上报测量报告。
一种示例，结合上述示例1，新的测量事件包括以下至少一种：
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，终端设备可以提前触发并上报测量报告，使得终端设备有足够的时间将第一无线承载配置为第二无线承载，并进行小区切换，降低了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，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基站是否支持多播广播发送方式判断是否先将MRB配置为DRB再执行切换。
S702、第一接入网设备根据测量报告确定第二接入网设备。
S703、第一接入网设备确定第二接入网设备是否支持多播广播传输方式。
一种可能的实现方式中，第一接入网设备确定第一接入网设备是否支持多播广播传输方式的方法至少包括以下三种方式，分别为：方式1、第一接入网设备通过与第二接入网设备进行信令交互确定第二接入网设备是否支持多播广播传输方式；方式2、第一接入网设备通过操作维护管理(operation administration and maintenance，OAM)系统确定第二接入网设备是否支持多播广播传输方式；方式3、第一接入网设备通过历史切换记录确定第二接入网设备是否支持多播广播传输方式。
下面，分别对上述方式1，方式2以及方式3进行详细说明：
方式1、第一接入网设备通过与第二接入网设备进行信令交互确定第二接入网设备是否支持多播广播传输方式。
一种可能的实现方式中，方式1可以通过以下步骤a至步骤c实现。
步骤a、第一接入网设备向第二接入网设备发送请求信息。相应的，第二接入网设备接收来自第一接入网设备的请求信息。
该请求信息用于请求查询第二接入网设备是否支持多播广播传输方式。
步骤b、第二接入网设备向第一接入网设备发送响应信息。相应的，第一接入网设备接收来自第二接入网设备的响应信息。
该响应信息用于指示第二接入网设备是否支持多播广播传输方式。
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多播广播传输方式。
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多播广播传输方式。
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多播广播传输方式。
步骤c、第一接入网设备根据响应信息确定第二接入网设备是否支持多播广播传输方式。
结合上述示例，第一接入网设备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多播广播传输方式。
方式2、第一接入网设备通过OAM系统确定第二接入网设备是否支持多播广播传输方式。
其中，上述OAM系统为第二接入网设备所属的OAM系统，该OAM系统中存储有第二接入网设备的配置信息。
方式3、第一接入网设备通过历史切换记录确定第二接入网设备是否支持多播广播传输方式。
具体来说，在首次终端设备由第一接入网设备切换至第二接入网设备时，第一接入网设备可以根据上述方式1或者方式2中所记载的方式确定第二接入网设备是否支持多播广播传输方式。在此之后，第一接入网设备存储历史切换记录，该历史切换记录能够表征第二接入网设备是否支持多播广播传输方式的信息。
在下一次切换时，第一接入网设备根据存储的历史切换记录确定第二接入网设备是否支持多播广播传输方式。
需要指出的是，在S703之后，若第一接入网设备确定第二接入网设备不支持多播广播传输方式，则第一接入网设备和终端设备执行上述S600和S601。
若第一接入网设备确定第二接入网设备支持多播广播传输方式，则第一接入网设备、第二接入网设备以及终端设备直接根据上述图5中所记载的步骤6-步骤10进行小区切换。
一种可能的实现方式中，在S600之后，若终端设备将第一无线承载配置为第二无线承载，则第一接入网设备与核心网设备之间的会话也可以由原来的MBS会话转换为单播会话(情况1)，或者，第一接入网设备与核心网设备之间仍保持MBS会话(情况2)。
以下，分别对情况1和情况2进行详细说明：
情况1、第一接入网设备与核心网设备之间的MBS会话转换为单播会话，第一接入网设备与核心网设备之间通过单播会话传输MBS。
如图7所示，在情况1中，在S600之后，方法还包括S704。
S704、第一接入网设备向核心网设备发送第二指示信息。相应的，核心网设备接收来自第一接入网的第二指示信息。
其中，上述第二指示信息用于指示核心网设备通过与终端设备对应的单播会话或者单播服务质量流向第一接入网设备发送MBS。
一种可能的实现方式中，第二指示信息还用于指示数据包序列号。数据包序列号为核心网设备通过单播会话或者单播服务质量流发送的MBS的第一个数据包的数据包序列号。
其中，上述数据包序列号可以为数据包的通用分组无线服务隧道协议-用户面(GPRS Tunnelling Protocol-U，GTP-U)序列号(Serial Number，SN)或者QoS流标识(QoS Flow ID，QFI)SN。
情况2、第一接入网设备与核心网设备之间仍保持MBS会话传输MBS。
在情况2中，第一接入网设备在收到核心网设备通过MBS会话传输的MBS之后，将这些MBS数据映射到上述第二无线承载上进行传输。
一种可能的实现方式中，在终端设备接收到第一指示信息之后，终端设备会将第一无线承载配置为第二无线承载。以下，对终端设备会第一无线承载配置为第二无线承载的过程进行详细说明：其中，第一指示信息可以为第一接入网设备向终端设备发送的RRC消息。该RRC消息用于指示终端设备将MRB重配置为DRB。
结合图8所示，重配置之前的MRB中包括以下至少一项：PDCP配置，业务标识，无线承载标识。此外，MRB配置会关联PTP RLC配置和PTM RLC配置，分别用于数据包的PTP传输和PTM传输。
重配置之后的DRB包括以下至少一项：PDCP配置，安全配置，无线承载标识，关联的PTP RLC配置。
由此可知，终端设备将MRB配置为DRB的过程中，会删除MRB配置中的临时多播组标示(temporary multicast Group Identifier，TMGI)，并在MRB中增加安全配置。重配置后的DRB与重配置之前的MRB的无线承载标识保持一致。
相应的，第一指示信息中包括以下至少一项信息：PDCP配置信息，RLC配置信息，安全配置信息，以及DRB的标识信息。以下分别进行详细说明：
(a)、PDCP配置信息，用于配置DRB的PDCP。第一指示信息中可以包括PDCP配置信息，也可以不包括PDCP配置信息。
在第一指示信息中不包括PDCP配置信息的情况下，终端设备确定沿用MRB中的PDCP配置作为DRB的PDCP配置。此时，终端设备确定保留MRB中的PDCP配置作为DRB的PDCP配置。
在第一指示信息中包括PDCP配置信息的情况下，终端设备根据PDCP配置信息配置DRB的PDCP配置。此时，终端设备释放MRB中的PDCP配置，并根据第一指示信息中的PDCP配置信息进行PDCP配置。
(b)、RLC配置信息，用于指示DRB关联的RLC的配置信息，第一指示信息 中可以包括RLC配置信息，也可以不包括RLC配置信息。
在第一指示信息不包括RLC配置信息的情况下，终端设备确定沿用MRB中的PTP RLC作为DRB的RLC配置。此时，终端设备确保留MRB中的PTP RLC作为DRB的RLC配置。
在第一指示信息包括RLC配置信息的情况下，终端设备根据第一指示信息中的RLC配置信息配置DRB的RLC配置。此时，终端设备释放MRB中的RLC配置，并根据第一指示信息中的RLC配置信息配置DRB的RLC配置。
(c)、安全配置信息，用于配置DRB的安全配置。PDCP实体在传输数据包的过程中，根据安全配置对数据包进行安全处理，以提高数据的安全性。
(d)、DRB的标识，用于指示配置后的DRB的标识。
需要指出的是，在终端设备将MRB配置为DRB之后，为了避免MRB业务的数据包丢失，第一接入网设备确定第二无线承载对应的PDCP实体沿用第一无线承载对应的PDCP实体的传输窗的传输状态以及传输参数。
具体来说，第一接入网设备在确定终端设备将MRB配置为DRB之后，第一接入网设备和终端设备不重新建立新的PDCP实体，而是使DRB仍沿用MRB对应的PDCP实体。同时，第一接入网设备和终端设备不初始化或重置MRB对应的PDCP实体的传输窗的传输状态以及传输参数。
需要说明的是，第一接入网设备在确定终端设备将MRB配置为DRB之后，第一接入网设备和终端设备也可以重建PDCP实体。此时，重建后的PDCP实体的传输窗的传输状态以及传输参数需要进行初始化或重置。
在该情况下，为了减少数据包丢失，第一接入网设备需要进行冗余传输。
例如，第一接入网设备确定在将MRB配置为DRB之前，第一接入网设备为终端设备传输到数据包#10，则在将MRB配置为DRB之后，第一接入网设备从数据包#10之前的数据包(例如数据包#5)开始传输，以减少数据包的丢失。
基于上述技术方案，本申请实施例提供了一种在终端设备进行小区切换之前，由终端设备将MRD配置为DRB，然后第一接入网设备与终端设备之间以单播的形式传输MBS的方法。在此之后终端设备可以按照现有切换流程进行小区切换，此时，由于MBS以单播形式发送，在将MBS切换到第二接入网设备之后，仍可以按照单播的形式传输MBS，避免了小区切换之后无法保证MBS的业务连续性的问题。
此外，本申请实施例还提供了一种通信方法，在切换之前第一接入网设备与终端设备之间保持多播的形式传输MBS。在切换之后，终端设备与第二接入网设备之间以单播的形式传输MBS。第一接入网设备将未发送的MBS以单播的形式发送给第二接入网设备。
如图9所示，该通信方法包括：S900-S903。以下进行详细说明。
S900、第一接入网设备接收第三指示信息。
第三指示信息用于指示单播服务质量流与MBS服务质量流的关联关系。
第三指示信息可以承载在核心网设备向第一接入网设备发送的MBS上下文信息中。例如，在MBS会话或者MBS流建立时，核心网设备通过MBS上下文信息向第一接入网设备发送第三指示信息。
第三指示信息包括以下至少一项：MBS服务质量流对应的单播服务质量流的流标识，单播服务质量流的QoS参数。
单播服务质量流的流标识的流标识可以通过单播服务质量流的PDU会话的标识，或者单播服务质量流的流标识的标识表征。
一种可能的实现方式中，第三指示信息为核心网设备向第二接入网设备发送的指示信息。核心网设备向第一接入网设备发送第三指示信息的时间可以在终端设备向第一接入网设备发送测量报告之前，也可以在终端设备向第一接入网设备发送测量报告之后，或者也可以在终端设备向第一接入网设备发送测量报告的时间相同，本申请对此不做限定。
又一种可能的实现方式中，第三指示信息还用于指示MBS会话与单播会话的关联关系，本申请对此不做限定。
S901、在切换过程中，第一接入网设备根据第三指示信息，将MBS服务质量流映射为单播服务质量流。
S902、第一接入网设备向第二接入网设备转发单播服务质量流。
具体来说，第一接入网设备与第二接入网设备之间建立数据传输通道。由于第二接入网设备不支持多播广播传输方式，也就无法识别MBS服务质量流。因此，第一接入网设备将MBS服务质量流映射为单播服务质量流。在此之后，第一接入网设备通过建立的数据传输通道向第二接入网设备传输单播服务质量流。
S903、第二接入网设备通过单播无线承载向终端设备发送MBS。
需要指出的是，第二接入网设备与终端设备之间的单播无线承载为切换过程中建立的单播无线承载。
其中，第二接入网设备向终端设备发送MBS时，生成的单播服务质量流的标识同样可以根据上述第三指示信息所指示的关联关系确定，此处不再赘述。
结合图9，如图10所示，S901具体可以通过以下S1000-S1007实现。
S1000、核心网设备向第一接入网设备发送MBS。相应的，第一接入网设备接收来自核心网设备的MBS。需要指出的是，S1000的具体实现方式与上述S700类似，本申请对此不在赘述。
S1001、终端设备向第一接入网设备发送测量报告。
需要指出的是，S1001的具体实现方式与上述S701类似，本申请对此不在赘述。
S1002、第一接入网设备根据测量报告确定第二接入网设备。
需要指出的是，S1002的具体实现方式与上述S702类似，本申请对此不在赘述。
S1003、第一接入网设备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，该切换请求中可以包括MBS的相关信息。
一种示例，该切换请求中包括MBS的上下文信息(MBS info)。
S1004、第二接入网设备生成第一配置信息。
第一配置信息用于指示终端设备根据第二接入网的配置信息进行配置。
一种可能的实现方式中，第一配置信息中包括第二接入网设备用于小区切换以及与终端设备进行数据传输的全部配置信息。
具体来说，在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，因为第二接入网设备不支持多播广播传输方式，所以，第二接入网设备将无法识别切换请求中的MBS信息。
此时，第二接入网设备确定第一接入网与终端设备之间的配置信息中包括第二接入网设备无法识别的配置信息，为了能够让终端设备按照第二接入网设备的配置信息进行配置，第二接入网设备生成第一配置信息，以使得终端设备能够根据第一配置信息进行配置。
一种示例，第一配置信息可以为full-config(完全配置)，用于指示终端设备完全根据第二接入网设备的配置信息进行配置，而不是基于第二接入网设备的配置信息进行delta config(增量配置)。
S1005、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)。相应的，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。
其中，该切换请求确认信息中包括上述第一配置信息。
S1006、第一接入网设备向终端设备发送切换命令(Handover command)。相应的，终端设备接收来自第一接入网设备的切换命令。
其中，该切换命令中包括上述第一配置信息。
在终端设备接收到该切换命令后，终端设备识别切换命令中的第一配置信息，终端设备根据第一配置信息所写到的第二接入网设备的配置信息进行配置，并向第二接入网设备进行切换。
需要指出的是，终端设备根据第二接入网设备的配置信息进行配置的过程中，终端设备在终端设备与第二接入网设备之间建立单播无线承载，以便于后续第二接入网设备通过单播无线承载向终端设备传输数据。
S1007、第一接入网设备根据第三指示信息，将MBS服务质量流映射为单播服务质量流。
具体来说，第一接入网设备根据第三指示信息指示的MBS服务质量流与单播服务质量流之间的对应关系，将MBS服务质量流映射为单播服务质量流。
一种可能的实现方式中，第三指示信息指示MBS服务质量流与单播服务质量流的标识之间的映射关系。
第一接入网设备确定MBS服务质量流对应的单播服务质量流的标识之后，第一接入网设备将MBS服务质量流的数据包包头中的流标识替换为对应的单播服务质量流的流标识，得到单播服务质量流。第一接入网设备通过建立好的数据传输通道向第二接入网设备发送该单播服务质量流。
如图10所示，在S902之后，方法还包括：
S1008、第二接入网设备向核心网设备发送路径切换请求消息(Path switch request)。
该路径切换请求用于请求核心网设备将MBS的传输路径由第一接入网设备切换到第二接入网设备。
该路径切换请求中不包括MBS的相关信息。
S1009、核心网设备通过单播会话或者单播服务质量流向第二接入网设备传输 MBS。
具体来说，核心网设备接收到该路径切换请求之后，确定请求切换的路径为MBS的传输路径，且路径切换请求中不包括MBS的相关信息。
据此，核心网设备确定第二接入网设备不支持多播广播传输方式。核心网设备以单播会话或者单播服务质量流的形式向第二接入网设备发送MBS的数据包。
基于上述技术方案，在终端设备向第二接入网设备进行切换之前，第一接入网设备与终端设备之间保持多播的形式传输MBS，在终端设备进行小区切换的过程中，第一接入网设备指示终端设备以单播的形式与第二接入网之间传输MBS。在切换之后，终端设备与第二接入网设备之间以单播的形式传输MBS。第一接入网设备将未发送的MBS以单播的形式发送给第二接入网设备。
这样，可以保证终端设备切换到第二接入网设备之后，采用单播的形式传输MBS。该方法保证了终端设备切换到第二接入网设备之后，仍能够正确传输MBS。此外，该切换流程与现有的切换流程相似，便于实现，且能够保证终端设备接收MBS的连续性。
以上，记载了两种终端设备由支持多播广播传输方式的第一接入网设备切换到不支持多播广播传输方式的第二接入网设备时，在切换完成之后第二接入网设备将MBS以单播的形式向终端设备发送MBS的方法。
在该场景下，由于第二接入网设备与终端设备之间通过单播的形式传输MBS，那么如果终端设备再次进行了小区切换，由第二接入网设备切换到了支持多播广播传输方式的第三接入网设备，按照现有的切换流程切换之后，第三接入网设备与终端设备之间仍然采用单播的形式传输MBS。
这将可能造成第三接入网设备与终端设备之间传输资源的浪费，例如，第三接入网设备正在以多播的形式向其他的终端传输MBS，如果第三接入网设备仍保持以单播的形式向终端设备传输MBS，这将会导致第三接入网设备重复发送MBS，造成第三接入网的传输资源的浪费。
为此，本申请实施例又提供了以下方法，用于解决终端设备由不支持多播广播传输方式的接入网设备切换到支持多播广播传输方式的接入网设备时，由于重复传输MBS导致的传输资源浪费的问题。
如图11所示，该方法包括：
S1100、核心网设备确定以单播形式传输的MBS的传输进度是否大于或等于以多播形式传输的该MBS的传输进度。
具体来说，在切换之前，终端设备与不支持多播广播传输方式的接入网设备之间采用单播的形式传输MBS。在切换之后，终端设备与第三接入网设备之间仍以单播的形式传输MBS。
在该情况下，核心网设备判断第三接入网设备是否支持多播广播传输方式。
若是，则核心网设备判断第三接入网设备当前是否正在以多播的形式传输上述MBS。
若是，则核心网设备确定以单播形式传输的MBS的传输进度，以及以多播形式传输的该MBS的传输进度。
核心网设备确定以单播形式传输的MBS的传输进度是否大于或等于以多播形式 传输的该MBS的传输进度。
S1101、若是，则核心网设备向第三接入网设备发送第六指示信息。相应的，第三接入网设备接收来自核心网设备的第六指示信息。
第六指示信息用于指示第三接入网设备将单播会话配置为多播会话。
一种示例，第六指示信息为会话修改信息。
一种可能的实现方式中，核心网设备确定当前以单播形式传输的MBS的数据包的标识，以及当前以多播形式传输的该MBS的数据包的标识。若当前以单播形式传输的MBS的数据包的标识大于或等于当前以多播形式传输的该MBS的数据包的标识。
示例性的，若核心网设备确定当前以单播形式传输的MBS的数据包的标识为数据包#9，当前以单播形式传输的MBS的数据包的标识为数据包#7。此时，以单播形式传输的MBS的传输进度大于以多播形式传输的该MBS的传输进度，核心网设备向第三接入网设备发送第六指示信息。
若核心网设备确定当前以单播形式传输的MBS的数据包的标识为数据包#9，当前以单播形式传输的MBS的数据包的标识为数据包#11。此时，以单播形式传输的MBS的传输进度小于以多播形式传输的该MBS的传输进度。
如果核心网设备此时向第三接入网设备发送第六指示信息，那么将可能导致第三接入网设备将以单播形式传输的MBS直接关联到多播形式传输的MBS。由于第三接入网设备以单播形式传输的MBS未发送数据包#10，而第三接入网设备以多播形式传输的MBS已经发送了数据包#10。此时将MBS直接关联到多播形式传输的MBS，将导致终端设备无法接收到数据包#10。
因此，在该情况下，核心网设备不向第三接入网设备发送第六指示信息，核心网设备可以暂停以多播形式传输的MBS，直至以单播形式传输的MBS的传输进度大于或等于以多播形式传输的该MBS的传输进度。
S1102、第三接入网设备向终端设备发送第四指示信息。相应的，终端设备接收来自第三接入网设备的第四指示信息。
第四指示信息用于指示终端设备将第二无线承载配置为第一无线承载；第一无线承载为多播无线承载，第二无线承载为单播无线承载。
S1103、终端设备将第一无线承载对应的PDCP实体中的数据包递交至高层协议实体中。
上述高层协议实体为接收PDCP实体传输的数据的协议层。例如，传输控制协议/网际协议(transmission control protocol/internet protocol，TCP/IP)层，应用层，用户数据报协议(user datagram protocol，UDP)层等，本申请对此不做限定。
一种可能的实现方式中，终端设备将第一无线承载对应的PDCP实体中的全部接收到的数据包递交至高层协议实体中。
又一种可能的实现方式中，终端设备将第一无线承载对应的PDCP实体中连续接收的数据包按序递交至高层协议实体中。终端设备删除其他数据包，比如接收空洞之后的数据包。空洞指的是未接收到的数据包对应的序列号。例如，PDCP实体中包括数据包#1、数据包#2、以及数据包#4，则数据包#3对应的序列号记为空洞的数据包。
一种示例，终端设备的第一无线承载对应的PDCP实体中包括数据包#1、数据包 #2、以及数据包#4，则终端设备将数据包#1、数据包#2递交至高层协议实体中，终端设备删除数据包#4，其中数据包#3对应接收空洞。
S1104、终端设备执行以下至少一种操作，将第二无线承载配置为第一无线承载。
建立PTM RLC实体，配置MBS标识，删除第二无线承载配置中的安全配置。
具体来说，终端设备将第二无线承载配置为第一无线承载为与上述终端设备将第一无线承载配置为第二无线承载相反的过程。其具体实现可以参照上述图8所示的将第一无线承载配置为第二无线承载的过程，此处不再赘述。
需要指出的是，在将第二无线承载配置为第一无线承载的过程中，由于配置为第一无线承载之后，第三接入网设备将按照之前第一无线承载传输MBS的情况进行MBS传输。因此，在重配置第二无线承载的PDCP实体的传输窗的传输状态以及传输参数时，需要以传输MBS的第一无线承载的PDCP实体的传输窗的传输状态以及传输参数进行配置。
S1105、终端设备向第三接入网设备发送第五指示信息。相应的，第三接入网设备向终端设备发送第五指示信息。
第五指示信息用于指示终端设备未成功接收到的数据包对应的序列号。
具体来说，在终端设备将第一无线承载对应的PDCP实体中的全部数据包递交至高层协议实体中的情况下，第五指示信息用于指示终端设备全部未接收到的数据包。
在终端设备将第一无线承载对应的PDCP实体中连续接收的数据包按序递交至高层协议实体中，终端设备删除其他数据包，比如接收空洞之后的数据包情况下，终端设备上报接收空洞对应的序列号或者接收空洞之后的第一个数据包的序列号，以指示第三接入网设备从该数据包进行传输。
例如，结合上述S1103中的示例，终端设备上报数据包#3的序列号。第三接入网设备接收到该数据包#3的序列号后，从数据包#3开始传输。
需要指出的是，第五指示信息可以以位图的形式指示数据包的序列号，也可以直接指示数据包序列号，本申请对此不做限定。
S1106、第三接入网设备通过第一无线承载向终端设备发送MBD业务。相应的，终端设备通过第一无线承载接收来自第三接入网设备的MBD业务。
需要指出的是，在本申请中以终端设备由第二接入网设备切换到第三接入网设备为例进行说明，在实际过程中，该方法可以适用于终端设备与接入网设备正在以单播的形式传输MBS时，终端设备切换到支持多播广播传输方式的接入网设备的场景，本申请对此不做限定。
基于上述技术方案，本申请实施例提供了一种通信方法，在终端设备由不支持多播广播传输方式的接入网设备切换到支持多播广播传输方式的接入网设备的情况下，若终端设备与接入网设备之间以单播的形式传输MBS，则将该MBS映射到以多播传输的MBS中。解决了重复传输MBS导致的传输资源浪费的问题。
上述主要从各个网元之间交互的角度对本申请实施例的方案进行了介绍。可以理解的是，各个网元，例如，终端设备，接入网设备(例如，第一接入网设备、第二接入网设备和/或第三接入网设备)以及核心网设备为了实现上述功能，其包含了执行各个功能相应的硬件结构和软件模块中的至少一个。本领域技术人员应该很容易意识到， 结合本文中所公开的实施例描述的各示例的单元及算法步骤，本申请能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
本申请实施例可以根据上述方法示例对接入网设备，核心网设备和终端设备进行功能单元的划分，例如，可以对应各个功能划分各个功能单元，也可以将两个或两个以上的功能集成在一个处理单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。需要说明的是，本申请实施例中对单元的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。
在采用集成的单元的情况下，图12示出了上述实施例中所涉及的通信装置(记为通信装置120)的一种可能的结构示意图，该通信装置120包括处理单元1201和通信单元1202，还可以包括存储单元1203。图12所示的结构示意图可以用于示意上述实施例中所涉及的接入网设备，核心网设备和终端设备的结构。
当图12所示的结构示意图用于示意上述实施例中所涉及的终端设备的结构时，处理单元1201用于对终端设备的动作进行控制管理，例如，控制终端设备执行图6中的S600和S601，图7中的S600、S601、S700、S701、S704，图9中的S903、图10中的S1000，S1001、S1006和S903，图11中的S1102至S1106，和/或本申请实施例中所描述的其他过程中的终端设备执行的动作。处理单元1201可以通过通信单元1202与其他网络实体通信，例如，与图2中示出的第一接入网设备和第二接入网设备通信。存储单元1203用于存储终端设备的程序代码和数据。
当图12所示的结构示意图用于示意上述实施例中所涉及的终端设备的结构时，通信装置120可以是终端设备，也可以是终端设备内的芯片。
当图12所示的结构示意图用于示意上述实施例中所涉及的第一接入网设备的结构时，处理单元1201用于对第一接入网设备的动作进行控制管理，例如，控制第一接入网设备执行图6中的S600和S601，图7中的S600、S601、S700至S703，图9中的S900、S901和S902，图10中的S900、S902、S1000至S1003、S1005至S1007，和/或本申请实施例中所描述的其他过程中的第一接入网设备执行的动作。处理单元1201可以通过通信单元1202与其他网络实体通信，例如，与图2中示出的终端设备和接入网设备通信。存储单元1203用于存储第一接入网设备的程序代码和数据。
当图12所示的结构示意图用于示意上述实施例中所涉及的第一接入网设备的结构时，通信装置120可以是第一接入网设备，也可以是第一接入网设备内的芯片。
当图12所示的结构示意图用于示意上述实施例中所涉及的第二接入网设备的结构时，处理单元1201用于对第二接入网设备的动作进行控制管理，例如，控制第二接入网设备执行图9中的S902和S903，图10中的S902、S903、S1003至S1005、S1008和S1009，和/或本申请实施例中所描述的其他过程中的第二接入网设备执行的动作。处理单元1201可以通过通信单元1202与其他网络实体通信，例如，与图2中示出的终端设备和第一接入网设备通信。存储单元1203用于存储第二接入网设备的程序代码和数据。
当图12所示的结构示意图用于示意上述实施例中所涉及的第二接入网设备的结构时，通信装置120可以是第二接入网设备，也可以是第二接入网设备内的芯片。
当图12所示的结构示意图用于示意上述实施例中所涉及的第三接入网设备的结构时，处理单元1201用于对第三接入网设备的动作进行控制管理，例如，控制第三接入网设备执行图11中的S1101、S1102、S1105和S1106，和/或本申请实施例中所描述的其他过程中的第三接入网设备执行的动作。处理单元1201可以通过通信单元1202与其他网络实体通信，例如，与图2中示出的终端设备和第一接入网设备通信。存储单元1203用于存储第三接入网设备的程序代码和数据。
当图12所示的结构示意图用于示意上述实施例中所涉及的第三接入网设备的结构时，通信装置120可以是第三接入网设备，也可以是第三接入网设备内的芯片。
当图12所示的结构示意图用于示意上述实施例中所涉及的核心网设备的结构时，处理单元1201用于对核心网设备的动作进行控制管理，例如，控制核心网设备执行图7中的S704，图9中的S900，图10中的S900、S1008和S1009，图11中的S1100和S1101，和/或本申请实施例中所描述的其他过程中的终端设备执行的动作。处理单元1201可以通过通信单元1202与其他网络实体通信，例如，与图2中示出的终端设备和第一核心网设备通信。存储单元1203用于存储核心网设备的程序代码和数据。
当图12所示的结构示意图用于示意上述实施例中所涉及的核心网设备的结构时，通信装置120可以是核心网设备，也可以是核心网设备内的芯片。
其中，当通信装置120为终端设备，接入网设备或核心网设备时，处理单元1201可以是处理器或控制器，通信单元1202可以是通信接口、收发器、收发机、收发电路、收发装置等。其中，通信接口是统称，可以包括一个或多个接口。存储单元1203可以是存储器。当通信装置120为终端设备，接入网设备或核心网设备内的芯片时，处理单元1201可以是处理器或控制器，通信单元1202可以是输入接口和/或输出接口、管脚或电路等。存储单元1203可以是该芯片内的存储单元(例如，寄存器、缓存等)，也可以是终端设备，接入网设备或核心网设备内的位于该芯片外部的存储单元(例如，只读存储器(read-onlymemory，简称ROM)、随机存取存储器(random access memory，简称RAM)等)。
其中，通信单元也可以称为收发单元。通信装置120中的具有收发功能的天线和控制电路可以视为通信装置120的通信单元1202，具有处理功能的处理器可以视为通信装置120的处理单元1201。可选的，通信单元1202中用于实现接收功能的器件可以视为接收单元，接收单元用于执行本申请实施例中的接收的步骤，接收单元可以为接收机、接收器、接收电路等。
图12中的集成的单元如果以软件功能模块的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请实施例的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)或处理器(processor)执行本申请各个实施例所述方法的全部或部分步骤。存储计算机软件产品的存储介质包括：U盘、移动硬盘、只读存储器、随机存取存储器、磁碟或者 光盘等各种可以存储程序代码的介质。
图12中的单元也可以称为模块，例如，处理单元可以称为处理模块。
本申请实施例还提供了一种通信装置(记为通信装置130)的硬件结构示意图，参见图13或图14，该通信装置130包括处理器1301，可选的，还包括与处理器1301连接的存储器1302。
在第一种可能的实现方式中，参见图13，通信装置130还包括收发器1303。处理器1301、存储器1302和收发器1303通过总线相连接。收发器1303用于与其他设备或通信网络通信。可选的，收发器1303可以包括发射机和接收机。收发器1303中用于实现接收功能的器件可以视为接收机，接收机用于执行本申请实施例中的接收的步骤。收发器1303中用于实现发送功能的器件可以视为发射机，发射机用于执行本申请实施例中的发送的步骤。
基于第一种可能的实现方式，图13所示的结构示意图可以用于示意上述实施例中所涉及的终端设备、第一接入网设备、第二接入网设备、第三接入网设备或核心网设备的结构。
当图13所示的结构示意图用于示意上述实施例中所涉及的终端设备的结构时，处理器1301用于对终端设备的动作进行控制管理，例如，处理器1301用于支持终端设备执行图6中的S600和S601，图7中的S600、S601、S700、S701、S704，图9中的S903、图10中的S1000，S1001、S1006和S903，图11中的S1102至S1106，和/或本申请实施例中所描述的其他过程中的终端设备执行的动作。处理器1301可以通过收发器1303与其他网络实体通信，例如，与图2中示出的第一接入网设备和第二接入网设备通信。存储器1302用于存储终端设备的程序代码和数据。
当图13所示的结构示意图用于示意上述实施例中所涉及的第一接入网设备的结构时，处理器1301用于对终端设备的动作进行控制管理，例如，处理器1301用于支持第一接入网设备执行图6中的S600和S601，图7中的S600、S601、S700至S703，图9中的S900、S901和S902，图10中的S900、S902、S1000至S1003、S1005至S1007，和/或本申请实施例中所描述的其他过程中的第一接入网设备执行的动作。处理器1301可以通过收发器1303与其他网络实体通信，例如，与图2中示出的终端设备和接入网设备通信。存储器1302用于存储第一接入网设备的程序代码和数据。
当图13所示的结构示意图用于示意上述实施例中所涉及的第二接入网设备的结构时，处理器1301用于对第二接入网设备的动作进行控制管理，例如，处理器1301用于支持第二接入网设备执行图9中的S902和S903，图10中的S902、S903、S1003至S1005、S1008和S1009，和/或本申请实施例中所描述的其他过程中的第二接入网设备执行的动作。处理器1301可以通过收发器1303与其他网络实体通信，例如，与图2中示出的终端设备和核心网设备通信。存储器1302用于存储第二接入网设备的程序代码和数据。
当图13所示的结构示意图用于示意上述实施例中所涉及的第三接入网设备的结构时，处理器1301用于对第三接入网设备的动作进行控制管理，例如，处理器1301用于支持第三接入网设备执行图11中的S1101、S1102、S1105和S1106，和/或本申请实施例中所描述的其他过程中的第三接入网设备执行的动作。处理器1301可以通过收 发器1303与其他网络实体通信，例如，与图2中示出的终端设备和核心网设备通信。存储器1302用于存储第三接入网设备的程序代码和数据。
当图13所示的结构示意图用于示意上述实施例中所涉及的核心网设备的结构时，处理器1301用于对接入网设备的动作进行控制管理，例如，处理器1301用于支持接入网设备执行图7中的S704，图9中的S900，图10中的S900、S1008和S1009，图11中的S1100和S1101，和/或本申请实施例中所描述的其他过程中的接入网设备执行的动作。处理器1301可以通过收发器1303与其他网络实体通信，例如，与图1中示出的终端设备和核心网设备通信。存储器1302用于存储接入网设备的程序代码和数据。
在第二种可能的实现方式中，处理器1301包括逻辑电路以及输入接口和输出接口中的至少一个。其中，输出接口用于执行相应方法中的发送的动作，输入接口用于执行相应方法中的接收的动作。
基于第二种可能的实现方式，参见图14，图14所示的结构示意图可以用于示意上述实施例中所涉及的终端设备、接入网设备或核心网设备的结构。
当图14所示的结构示意图用于示意上述实施例中所涉及的终端设备的结构时，处理器1301用于对终端设备的动作进行控制管理，例如，处理器1301用于支持终端设备执行图6中的S600和S601，图7中的S600、S601、S700、S701、S704，图9中的S903、图10中的S1000，S1001、S1006和S903，图11中的S1102至S1106，和/或本申请实施例中所描述的其他过程中的终端设备执行的动作。处理器1301可以通过输入接口和输出接口中的至少一个与其他网络实体通信，例如，与图2中示出的第一接入网设备和第二接入网设备通信。存储器1302用于存储终端设备的程序代码和数据。
当图14所示的结构示意图用于示意上述实施例中所涉及的第一接入网设备的结构时，处理器1301用于对第一接入网设备的动作进行控制管理，例如，处理器1301用于支持第一接入网设备执行图6中的S600和S601，图7中的S600、S601、S700至S703，图9中的S900、S901和S902，图10中的S900、S902、S1000至S1003、S1005至S1007，和/或本申请实施例中所描述的其他过程中的第一接入网设备执行的动作。处理器1301可以通过输入接口和输出接口中的至少一个与其他网络实体通信，例如，与图1中示出的终端设备和接入网设备通信。存储器1302用于存储第一接入网设备的程序代码和数据。
当图14所示的结构示意图用于示意上述实施例中所涉及的第二接入网设备的结构时，处理器1301用于对第二接入网设备的动作进行控制管理，例如，处理器1301用于支持第二接入网设备执行图9中的S902和S903，图10中的S902、S903、S1003至S1005、S1008和S1009，和/或本申请实施例中所描述的其他过程中的第二接入网设备执行的动作。处理器1301可以通过输入接口和输出接口中的至少一个与其他网络实体通信，例如，与图2中示出的终端设备和第一接入网设备通信。存储器1302用于存储第二接入网设备的程序代码和数据。
当图14所示的结构示意图用于示意上述实施例中所涉及的第三接入网设备的结构时，处理器1301用于对第三接入网设备的动作进行控制管理，例如，处理器1301用于支持第三接入网设备执行图11中的S1101、S1102、S1105和S1106，和/或本申请实施例中所描述的其他过程中的第三接入网设备执行的动作。处理器1301可以通过输 入接口和输出接口中的至少一个与其他网络实体通信，例如，与图2中示出的终端设备和第一接入网设备通信。存储器1302用于存储第三接入网设备的程序代码和数据。
当图14所示的结构示意图用于示意上述实施例中所涉及的核心网设备的结构时，处理器1301用于对核心网设备的动作进行控制管理，例如，处理器1301用于支持核心网设备执行图7中的S704，图9中的S900，图10中的S900、S1008和S1009，图11中的S1100和S1101，和/或本申请实施例中所描述的其他过程中的核心网设备执行的动作。处理器1301可以通过输入接口和输出接口中的至少一个与其他网络实体通信，例如，与图2中示出的终端设备和第一核心网设备通信。存储器1302用于存储核心网设备的程序代码和数据。
其中，图13和图14也可以示意接入网设备中的系统芯片。该情况下，上述接入网设备执行的动作可以由该系统芯片实现，具体所执行的动作可参见上文，在此不再赘述。图13和图14也可以示意终端设备中的系统芯片。该情况下，上述终端设备执行的动作可以由该系统芯片实现，具体所执行的动作可参见上文，在此不再赘述。图13和图14也可以示意接入网设备中的系统芯片。该情况下，上述第一接入网设备执行的动作可以由该系统芯片实现，具体所执行的动作可参见上文，在此不再赘述。
另外，本申请实施例还提供了一种终端设备(记为终端设备150)和接入网设备(记为接入网设备160)的硬件结构示意图，具体可分别参见图15和图14。该终端设备150可以为终端设备或第一接入网设备。
图15为终端设备150的硬件结构示意图。为了便于说明，图15仅示出了终端设备的主要部件。如图15所示，终端设备150包括处理器、存储器、控制电路、天线以及输入输出装置。
处理器主要用于对通信协议以及通信数据进行处理，以及对整个终端设备进行控制，执行软件程序，处理软件程序的数据。例如，控制终端设备执行图6中的S600和S601，图7中的S600、S601、S700、S701、S704，图9中的S903、图10中的S1000，S1001、S1006和S903，图11中的S1102至S1106。
存储器主要用于存储软件程序和数据。控制电路(也可以称为射频电路)主要用于基带信号与射频信号的转换以及对射频信号的处理。控制电路和天线一起也可以叫做收发器，主要用于收发电磁波形式的射频信号。输入输出装置，例如触摸屏、显示屏，键盘等主要用于接收用户输入的数据以及对用户输出数据。
当终端设备开机后，处理器可以读取存储器中的软件程序，解释并执行软件程序的指令，处理软件程序的数据。当需要通过天线发送数据时，处理器对待发送的数据进行基带处理后，输出基带信号至控制电路中的控制电路，控制电路将基带信号进行射频处理后将射频信号通过天线以电磁波的形式向外发送。当有数据发送到终端设备时，控制电路通过天线接收到射频信号，将射频信号转换为基带信号，并将基带信号输出至处理器，处理器将基带信号转换为数据并对该数据进行处理。
本领域技术人员可以理解，为了便于说明，图15仅示出了一个存储器和处理器。在实际的终端设备中，可以存在多个处理器和存储器。存储器也可以称为存储介质或者存储设备等，本申请实施例对此不做限制。
作为一种可选的实现方式，处理器可以包括基带处理器和中央处理器，基带处理 器主要用于对通信协议以及通信数据进行处理，中央处理器主要用于对整个终端设备进行控制，执行软件程序，处理软件程序的数据。图15中的处理器集成了基带处理器和中央处理器的功能，本领域技术人员可以理解，基带处理器和中央处理器也可以是各自独立的处理器，通过总线等技术互联。本领域技术人员可以理解，终端设备可以包括多个基带处理器以适应不同的网络制式，终端设备可以包括多个中央处理器以增强其处理能力，终端设备的各个部件可以通过各种总线连接。该基带处理器也可以表述为基带处理电路或者基带处理芯片。该中央处理器也可以表述为中央处理电路或者中央处理芯片。对通信协议以及通信数据进行处理的功能可以内置在处理器中，也可以以软件程序的形式存储在存储器中，由处理器执行软件程序以实现基带处理功能。
图16为接入网设备160的硬件结构示意图。接入网设备160可包括一个或多个射频单元，如远端射频单元(remote radio unit，简称RRU)1601和一个或多个基带单元(basebandunit，简称BBU)(也可称为数字单元(digitalunit，简称DU))1602。
该RRU1601可以称为收发单元、收发机、收发电路、或者收发器等等，其可以包括至少一个天线1611和射频单元1612。该RRU1601部分主要用于射频信号的收发以及射频信号与基带信号的转换。该RRU1601与BBU1602可以是物理上设置在一起，也可以物理上分离设置的，例如，分布式基站。
该BBU1602为接入网设备的控制中心，也可以称为处理单元，主要用于完成基带处理功能，如信道编码，复用，调制，扩频等等。
在一个实施例中，该BBU1602可以由一个或多个单板构成，多个单板可以共同支持单一接入制式的无线接入网(如LTE网络)，也可以分别支持不同接入制式的无线接入网(如LTE网，5G网或其它网)。该BBU1602还包括存储器1621和处理器1622，该存储器1621用于存储必要的指令和数据。该处理器1622用于控制接入网设备进行必要的动作。该存储器1621和处理器1622可以服务于一个或多个单板。也就是说，可以每个单板上单独设置存储器和处理器。也可以是多个单板共用相同的存储器和处理器。此外每个单板上还可以设置有必要的电路。
应理解，图16所示的接入网设备160能够执行图6中的S600和S601，图7中的S600、S601、S700至S703，图9中的S900、S901和S902，图10中的S900、S902、S1000至S1003、S1005至S1007；或图9中的S902和S903，图10中的S902、S903、S1003至S1005、S1008和S1009；或图11中的S1101、S1102、S1105和S1106；和/或本申请实施例中所描述的其他过程中的接入网设备执行的动作。接入网设备160中的各个模块的操作，功能，或者，操作和功能，分别设置为实现上述方法实施例中的相应流程。具体可参见上述方法实施例中的描述，为避免重复，此处适当省略详述描述。
在实现过程中，本实施例提供的方法中的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。结合本申请实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。
本申请中的处理器可以包括但不限于以下至少一种：中央处理单元(central processing unit，CPU)、微处理器、数字信号处理器(DSP)、微控制器(microcontroller unit，MCU)、或人工智能处理器等各类运行软件的计算设备，每种计算设备可包括一 个或多个用于执行软件指令以进行运算或处理的核。该处理器可以是个单独的半导体芯片，也可以跟其他电路一起集成为一个半导体芯片，例如，可以跟其他电路(如编解码电路、硬件加速电路或各种总线和接口电路)构成一个SoC(片上系统)，或者也可以作为一个ASIC的内置处理器集成在所述ASIC当中，该集成了处理器的ASIC可以单独封装或者也可以跟其他电路封装在一起。该处理器除了包括用于执行软件指令以进行运算或处理的核外，还可进一步包括必要的硬件加速器，如现场可编程门阵列(field programmable gate array，FPGA)、PLD(可编程逻辑器件)、或者实现专用逻辑运算的逻辑电路。
本申请实施例中的存储器，可以包括如下至少一种类型：只读存储器(read-only memory，ROM)或可存储静态信息和指令的其他类型的静态存储设备，随机存取存储器(random access memory，RAM)或者可存储信息和指令的其他类型的动态存储设备，也可以是电可擦可编程只读存储器(Electrically erasable programmabler-only memory，EEPROM)。在某些场景下，存储器还可以是只读光盘(compact disc read-only memory，CD-ROM)或其他光盘存储、光碟存储(包括压缩光碟、激光碟、光碟、数字通用光碟、蓝光光碟等)、磁盘存储介质或者其他磁存储设备、或者能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质，但不限于此。
本申请实施例还提供了一种计算机可读存储介质，包括指令，当其在计算机上运行时，使得计算机执行上述任一方法。
本申请实施例还提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行上述任一方法。
本申请实施例还提供了一种通信系统，包括：上述终端设备、第一接入网设备、第二接入网设备、核心网设备、和/或第三接入网设备。
本申请实施例还提供了一种芯片，该芯片包括处理器和接口电路，该接口电路和该处理器耦合，该处理器用于运行计算机程序或指令，以实现上述方法，该接口电路用于与该芯片之外的其它模块进行通信。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件程序实现时，可以全部或部分地以计算机程序产品的形式来实现。该计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行计算机程序指令时，全部或部分地产生按照本申请实施例所述的流程或功能。计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，计算机指令可以从一个网站站点、计算机、服务器或者数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，简称DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可以用介质集成的服务器、数据中心等数据存储设备。可用介质可以是磁性介质(例如，软盘、硬盘、磁带)，光介质(例如，DVD)、或者半导体介质(例如固态硬盘(solid state disk，简称SSD))等。

Claims (30)

  1. 一种通信方法，其特征在于，包括：
    终端设备接收第一指示信息，所述第一指示信息用于指示所述终端设备将第一无线承载配置为第二无线承载；所述第一无线承载为多播无线承载，所述第二无线承载为单播无线承载；
    所述终端设备通过所述第二无线承载接收多播广播业务MBS。
  2. 根据权利要求1所述的方法，其特征在于，所述第一指示信息具体用于指示所述第二无线承载的以下至少一项信息：分组数据汇聚层协议PDCP配置信息，无线链路控制层RLC配置信息，安全配置信息，以及所述第二无线承载的标识。
  3. 根据权利要求2所述的方法，其特征在于，所述第二无线承载沿用所述第一无线承载的以下至少一项配置信息：PDCP配置信息，点到点PTP RLC配置信息。
  4. 根据权利要求3所述的方法，其特征在于，所述第二无线承载对应的PDCP实体沿用所述第一无线承载对应的PDCP实体的传输窗的传输状态以及传输参数。
  5. 一种通信方法，其特征在于，包括：
    第一接入网设备发送第一指示信息，所述第一指示信息用于指示终端设备将第一无线承载配置为第二无线承载；所述第一无线承载为多播无线承载，所述第二无线承载为单播无线承载；
    所述第一接入网设备通过所述第二无线承载发送MBS。
  6. 根据权利要求5所述的方法，其特征在于，所述第一指示信息具体用于指示所述第二无线承载的以下至少一项信息：分组数据汇聚层协议PDCP配置信息，无线链路控制层RLC配置信息，安全配置信息，以及所述第二无线承载的标识。
  7. 根据权利要求6所述的方法，其特征在于，所述第二无线承载沿用所述第一无线承载的以下至少一项配置信息：PDCP配置信息，点到点PTP RLC配置信息。
  8. 根据权利要求7所述的方法，其特征在于，所述第二无线承载对应的PDCP实体沿用所述第一无线承载对应的PDCP实体的传输窗的传输状态以及传输参数。
  9. 根据权利要求5-8任一项所述的方法，其特征在于，还包括：
    所述第一接入网设备发送第二指示信息，所述第二指示信息用于指示核心网设备通过与所述终端设备对应的单播会话或者单播服务质量流向所述第一接入网设备发送所述MBS。
  10. 根据权利要求9所述的方法，其特征在于，所述第二指示信息还用于指示数据包序列号，所述数据包序列号为所述核心网设备通过所述单播会话或者所述单播服务质量流发送的所述MBS的第一个数据包的序列号。
  11. 一种通信方法，其特征在于，包括：
    第一接入网设备接收第三指示信息；所述第三指示信息用于指示单播服务质量流与MBS服务质量流的关联关系；
    在切换过程中，所述第一接入网设备根据所述第三指示信息，将所述MBS服务质量流映射为所述单播服务质量流；
    所述第一接入网设备转发所述单播服务质量流。
  12. 根据权利要求11所述的方法，其特征在于，所述第三指示信息包括以下至少 一项：所述MBS服务质量流对应的单播服务质量流的流标识，所述单播服务质量流的QoS参数。
  13. 一种通信方法，其特征在于，包括：
    终端设备接收第四指示信息，所述第四指示信息用于指示所述终端设备将第二无线承载配置为第一无线承载；所述第一无线承载为多播无线承载，所述第二无线承载为单播无线承载；
    所述终端设备通过所述第一无线承载接收MBS。
  14. 根据权利要求13所述的方法，其特征在于，在接收第四指示信息之后，还包括：
    所述终端设备将所述第一无线承载对应的PDCP实体中的数据包递交至高层协议实体中。
  15. 一种通信装置，其特征在于，包括：通信单元和处理单元；
    所述处理单元，用于指示所述通信单元接收第一指示信息，所述第一指示信息用于指示终端设备将第一无线承载配置为第二无线承载；所述第一无线承载为多播无线承载，所述第二无线承载为单播无线承载；
    所述处理单元，还用于指示所述通信单元通过所述第二无线承载接收多播广播业务MBS。
  16. 根据权利要求15所述的装置，其特征在于，所述第一指示信息具体用于指示所述第二无线承载的以下至少一项信息：分组数据汇聚层协议PDCP配置信息，无线链路控制层RLC配置信息，安全配置信息，以及所述第二无线承载的标识。
  17. 根据权利要求16所述的装置，其特征在于，所述第二无线承载沿用所述第一无线承载的以下至少一项配置信息：PDCP配置信息，点到点PTP RLC配置信息。
  18. 根据权利要求17所述的装置，其特征在于，所述第二无线承载对应的PDCP实体沿用所述第一无线承载对应的PDCP实体的传输窗的传输状态以及传输参数。
  19. 一种通信装置，其特征在于，包括：通信单元和处理单元；
    所述处理单元，用于指示所述通信单元发送第一指示信息，所述第一指示信息用于指示终端设备将第一无线承载配置为第二无线承载；所述第一无线承载为多播无线承载，所述第二无线承载为单播无线承载；
    所述处理单元，还用于指示所述通信单元通过所述第二无线承载发送MBS。
  20. 根据权利要求19所述的装置，其特征在于，所述第一指示信息具体用于指示所述第二无线承载的以下至少一项信息：分组数据汇聚层协议PDCP配置信息，无线链路控制层RLC配置信息，安全配置信息，以及所述第二无线承载的标识。
  21. 根据权利要求20所述的装置，其特征在于，所述第二无线承载沿用所述第一无线承载的以下至少一项配置信息：PDCP配置信息，点到点PTP RLC配置信息。
  22. 根据权利要求21所述的装置，其特征在于，所述第二无线承载对应的PDCP实体沿用所述第一无线承载对应的PDCP实体的传输窗的传输状态以及传输参数。
  23. 根据权利要求19-22任一项所述的装置，其特征在于，所述处理单元，还用于指示所述通信单元发送第二指示信息，所述第二指示信息用于指示核心网设备通过与所述终端设备对应的单播会话或者单播服务质量流向第一接入网设备发送所述 MBS。
  24. 根据权利要求23所述的装置，其特征在于，所述第二指示信息还用于指示数据包序列号，所述数据包序列号为所述核心网设备通过所述单播会话或者所述单播服务质量流发送的所述MBS的第一个数据包的序列号。
  25. 一种通信装置，其特征在于，包括：通信单元和处理单元；
    所述处理单元，用于指示所述通信单元接收第三指示信息；所述第三指示信息用于指示单播服务质量流与MBS服务质量流的关联关系；
    所述处理单元，还用于在切换过程中，根据所述第三指示信息将所述MBS服务质量流映射为所述单播服务质量流；
    所述处理单元，还用于指示所述通信单元转发所述单播服务质量流。
  26. 根据权利要求25所述的装置，其特征在于，所述第三指示信息包括以下至少一项：所述MBS服务质量流对应的单播服务质量流的流标识，所述单播服务质量流的QoS参数。
  27. 一种通信装置，其特征在于，包括：通信单元和处理单元；
    所述处理单元，用于指示所述通信单元接收第四指示信息，所述第四指示信息用于指示终端设备将第二无线承载配置为第一无线承载；所述第一无线承载为多播无线承载，所述第二无线承载为单播无线承载；
    所述处理单元，还用于指示所述通信单元通过所述第一无线承载接收MBS。
  28. 根据权利要求27所述的装置，其特征在于，所述处理单元，还用于：
    将所述第一无线承载对应的PDCP实体中的数据包递交至高层协议实体中。
  29. 一种神经网络模型优化装置，其特征在于，所述装置包括处理器和存储介质，所述存储介质包括指令，所述指令被所述处理器运行时，使得所述装置执行如权利要求1至14任一项所述的方法。
  30. 一种计算机可读存储介质，所述计算机可读存储介质中存储有指令，其特征在于，当所述指令在计算机上运行时，使得所述计算机执行如权利要求1至14任一项所述的方法。
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102118355A (zh) * 2009-12-31 2011-07-06 中兴通讯股份有限公司 多播广播业务信息处理方法
US20140228037A1 (en) * 2013-02-14 2014-08-14 Lg Electronics Inc. Method and apparatus for controlling a small cell on or off procedure for capacity enhancement
CN111866975A (zh) * 2020-05-18 2020-10-30 中兴通讯股份有限公司 切换方法及装置、信息发送方法及装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7636331B2 (en) * 2004-04-19 2009-12-22 Lg Electronic Inc. Transmission of control information in wireless communication system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102118355A (zh) * 2009-12-31 2011-07-06 中兴通讯股份有限公司 多播广播业务信息处理方法
US20140228037A1 (en) * 2013-02-14 2014-08-14 Lg Electronics Inc. Method and apparatus for controlling a small cell on or off procedure for capacity enhancement
CN111866975A (zh) * 2020-05-18 2020-10-30 中兴通讯股份有限公司 切换方法及装置、信息发送方法及装置

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
HUAWEI, HISILICON, OPPO: "KI#7, New Solution: Inter-RAN node MBS Session Handover", 3GPP DRAFT; S2-2004510, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. SA WG2, no. Elbonia; 20200601 - 20200612, 14 June 2020 (2020-06-14), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051898913 *
QUALCOMM INCORORPORATED: "Solution to KI#7: Mobility between 5G MBS supporting and 5G MBS non- supporting NG RAN nodes", 3GPP DRAFT; S2-2004223, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. SA WG2, no. Electronic meeting; 20200601 - 20200612, 22 May 2020 (2020-05-22), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051890227 *
See also references of EP4277348A4 *

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