WO2021088941A1 - 通信方法、设备及系统 - Google Patents

通信方法、设备及系统 Download PDF

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Publication number
WO2021088941A1
WO2021088941A1 PCT/CN2020/126865 CN2020126865W WO2021088941A1 WO 2021088941 A1 WO2021088941 A1 WO 2021088941A1 CN 2020126865 W CN2020126865 W CN 2020126865W WO 2021088941 A1 WO2021088941 A1 WO 2021088941A1
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Prior art keywords
network device
access network
target access
multicast service
multicast
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PCT/CN2020/126865
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English (en)
French (fr)
Inventor
宗在峰
朱奋勤
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP20885519.7A priority Critical patent/EP4040814A4/en
Publication of WO2021088941A1 publication Critical patent/WO2021088941A1/zh
Priority to US17/738,487 priority patent/US20220264378A1/en

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    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
    • 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
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/22—Manipulation of transport tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/40—Connection management for selective distribution or broadcast

Definitions

  • This application relates to the field of communication technology, and in particular to communication methods, equipment and systems.
  • the terminal device When the existing 4th generation (4G) network transmits multicast services, it is necessary to periodically broadcast the air interface configuration information (for example, data radio bearer, DRB) information of the multicast service through a dedicated broadcast channel Etc.), the terminal device obtains the air interface configuration information of the multicast service by monitoring the broadcast channel, so as to perform corresponding configuration and receive the multicast service.
  • the spectrum utilization rate is low.
  • the requirements for terminal equipment are also high.
  • the European standards organization 5G XCast proposed to multiplex the unicast channel of the terminal device to send the air interface configuration information of the multicast service to the terminal device to improve the spectrum utilization.
  • the terminal device does not need to monitor the dedicated broadcast channel to receive the air interface configuration information of the multicast service, thereby simplifying the design of the terminal device and reducing the requirements for the terminal device.
  • the embodiments of the present application provide a communication method, device, and system, which can reduce the multicast service delay caused by switching across access network devices.
  • a communication method and corresponding device are provided. This solution is applied to the scenario where the first terminal device moves from the source access network device to the target access network device.
  • the target access network device receives a first identifier from the source access network device, and the first identifier is used To identify the first multicast service; the target access network device determines the transmission mode of the data of the first multicast service between the target access network device and the first terminal device, and the transmission mode includes a unicast mode and a multicast mode;
  • the target access network device sends the wireless configuration information corresponding to the transmission mode to the first terminal device through the source access network device.
  • the source access network device before the first terminal device moves from the source access network device to the target access network device, the source access network device sends to the target access network device a message for identifying the first multicast service The first identifier, so that the target access network device can determine the transmission mode of the first multicast service data between the target access network device and the first terminal device, and send the wireless configuration corresponding to the transmission mode to the source access network device Information, and further, the source access network device may send the wireless configuration information to the first terminal device.
  • the wireless configuration information sent by the device is configured. That is to say, based on the communication method provided by the embodiments of the present application, the wireless configuration information used in the transmission of the multicast service can be sent to the first terminal device before the first terminal device moves or switches, thereby reducing the burden of the first terminal device. The delay of the multicast service caused by the device switching across the access network.
  • the foregoing transmission mode is a multicast mode
  • the wireless configuration information corresponding to the transmission mode includes scheduling indication information.
  • the scheduling indication information is used to determine the scheduling information of the first multicast service, and the scheduling information is used for Indicates the radio resource for transmitting the first multicast service.
  • the first terminal device can determine the radio resource for transmitting the first multicast service according to the scheduling indication information, and receive the first group on the radio resource Broadcast service data, thereby further reducing the delay of the multicast service caused by switching across access network devices.
  • the communication method further includes: the target access network device receives signal measurement information of the target cell from the source access network device, the target cell belongs to the target access network device; the target access network device determines The transmission mode of the data of the first multicast service between the target access network device and the first terminal device includes: the target access network device determines the transmission mode according to the signal measurement information of the target cell and/or the first quantity, the The first number is the number of terminal devices that receive data of the first multicast service through the target access network device.
  • the target access network device can reasonably and flexibly determine the first multicast service based on the signal measurement information of the target cell and/or the number of terminal devices that receive the data of the first multicast service through the target access network device.
  • the communication method further includes: the target access network device receives information about the quality of service QoS flow of the first multicast service from the source access network device; the target access network device according to the first multicast Information about the QoS flow of the service to obtain the wireless configuration information corresponding to the transmission mode.
  • the communication method further includes: the target access network device sends a first message to the first network device, the first message includes a first identifier, and the first message is used to request the establishment of the first multicast The first multicast session corresponding to the service.
  • the first multicast session corresponding to the first multicast service can be established on the target access network device, and the data of the first multicast service can be established from the provider of the first multicast service to the target access network device. Therefore, the continuity of the first multicast service is ensured, and the delay of the multicast service caused by the switching of the first terminal device across the access network device is further reduced.
  • the first message also includes information about the target access network device. Based on this solution, the first network device can determine that the target access network device is within the service range of the first multicast service according to the information of the target access network device, and then establish the first multicast service correspondence for the target access network device The first multicast session.
  • the first message further includes first information about the first multicast service, and the first information about the first multicast service includes at least one of the identifier of the first multicast session and the first path information.
  • the first path information includes an IP address of the target access network device and a first tunnel identifier, and the first tunnel identifier is used to identify a unicast tunnel through which the target access network device receives data of the first multicast service.
  • the first network device may subsequently modify the first multicast session according to the identifier of the first multicast session, etc. ;
  • the first information of the first multicast service includes the first path information
  • a tunnel between the user plane network element and the target access network device can be established for the data transmission of the first multicast service, so that the first group The data of the broadcast service is transmitted from the user plane network element to the target access network device, and then from the target access network device to the first terminal device.
  • the communication method further includes: the target access network device receives second information of the first multicast service, and the second information of the first multicast service includes: the identifier of the first multicast session and At least one item in the second path information, where the second path information includes a multicast address and a second tunnel identifier, and the multicast address is used by the target access network device to receive the data of the first multicast service in a multicast manner.
  • the second tunnel identifier is used to identify the multicast tunnel through which the target access network device receives the data of the first multicast service in a multicast manner.
  • the target network device when the second information of the first multicast service includes the identifier of the first multicast session, the target network device can subsequently be allowed to join the first terminal device to the first multicast session; When the second information includes the second path information, the target access network device can receive the data of the first multicast service according to the second path information, so as to transmit the data of the first multicast service to the first terminal device.
  • the communication method further includes: the target access network device sends first indication information and third information of the first multicast service, where the first indication information is used to instruct the first terminal device to move to the target
  • the third information of the first multicast service includes: the first identifier, the identifier of the first multicast session corresponding to the first multicast service, and the information of the first QoS flow of the first multicast service At least one item, where the first QoS flow is part or all of the QoS flows in the QoS flow of the first multicast service.
  • a communication method and corresponding device are provided.
  • This solution is applied to a scenario where the first terminal device moves from a source access network device to a target access network device.
  • the first network device receives a first message, and the first message includes a first identifier, and the first identifier Used to identify the first multicast service, the first message is used by the target access network device to request the establishment of the first multicast session corresponding to the first multicast service; when the target access network device is in the service range of the first multicast service During internal time, the first network device establishes a first multicast session corresponding to the first multicast service.
  • the first multicast session corresponding to the first multicast service can be established on the target access network device, and the data of the first multicast service can be established from the provider of the first multicast service to the target access network device. Therefore, the continuity of the first multicast service is ensured, and the delay of the multicast service caused by the switching of the first terminal device across the access network device is further reduced.
  • the first message further includes information about the target access network device
  • the communication method further includes: the first network device determines that the target access network device is located in the first network device according to the information about the target access network device. Within the service range of the multicast service.
  • the first message further includes first information about the first multicast service, and the first information about the first multicast service includes at least one of the identifier of the first multicast session and the first path information.
  • the first path information includes an IP address of the target access network device and a first tunnel identifier, and the first tunnel identifier is used to identify a unicast tunnel through which the target access network device receives data of the first multicast service.
  • the first information of the first multicast service includes the first information
  • the communication method further includes: the first network device sends the first path information to the second network device.
  • the first network device may subsequently modify the first multicast session according to the identifier of the first multicast session, etc. ;
  • the first information of the first multicast service includes the first path information
  • a tunnel between the user plane network element and the target access network device can be established for the data transmission of the first multicast service, so that the first group The data of the broadcast service is transmitted from the user plane network element to the target access network device, and then from the target access network device to the first terminal device.
  • the communication method further includes: the first network device sends at least one of the identifier of the first multicast session and the second path information, wherein the second path information includes the multicast address and the second path information.
  • Tunnel identifier the multicast address is used for the target access network device to receive the data of the first multicast service through multicast
  • the second tunnel identifier is used to identify the target access network device to receive the data of the first multicast service through multicast. Multicast tunnel.
  • the target network device when the second information of the first multicast service includes the identifier of the first multicast session, the target network device can subsequently be allowed to join the first terminal device to the first multicast session; When the second information includes the second path information, the target access network device can receive the data of the first multicast service according to the second path information, so as to transmit the data of the first multicast service to the first terminal device.
  • the communication method further includes: the first network device obtains policy information of the first multicast service, and the policy information of the first multicast service includes the service range of the first multicast service.
  • the communication method further includes: the first network device receives a second message, the second message is used to request the first network device to allow the first terminal device to receive the first multicast through the target access network device Service data; the first network device sends second indication information, which is used to indicate that the first terminal device is allowed to receive the data of the first multicast service through the target access network device.
  • the target access network device continues to send the data of the first multicast service to the first terminal device This can prevent the situation in which the first terminal device still sends the data of the first multicast service to the first terminal device when it is not allowed to receive the first multicast service.
  • the policy information of the first multicast service includes the identifier of the terminal device that is allowed to receive data of the first multicast service
  • the second message includes the identifier of the first terminal device
  • the communication method further includes: When the identification of the terminal device that is allowed to receive the data of the first multicast service includes the identification of the first terminal device, the first network device determines that the first terminal is allowed to receive the data of the first multicast service through the target access network device.
  • a communication method and corresponding device are provided.
  • This solution is applied to a scenario where the first terminal device moves from a source access network device to a target access network device.
  • the source access network device sends a first identifier to the target access network device, and the first identifier is used for Identifies the first multicast service;
  • the source access network device receives wireless configuration information from the target access network device, and the wireless configuration information and the data of the first multicast service are transmitted between the target access network device and the first terminal device
  • the transmission mode includes a unicast mode or a multicast mode;
  • the source access network device sends wireless configuration information to the first terminal device.
  • the transmission mode is a multicast mode
  • the wireless configuration information includes scheduling indication information.
  • the scheduling indication information is used to determine the scheduling information of the first multicast service, and the scheduling information is used to indicate the transmission of the first multicast service.
  • Wireless resources are used to indicate the transmission of the first multicast service.
  • the communication method further includes: the source access network device sends signal measurement information of the target cell to the target access network device, the target cell belongs to the target access network device, and the signal measurement information is used for the target access
  • the network equipment determines the transmission mode.
  • the communication method further includes: the source access network device sends the QoS flow information of the first multicast service to the target access network device.
  • the communication method further includes: the source access network device obtains the context of the second multicast session according to the first identifier, or the source access network device obtains the context of the second multicast session according to the identifier of the second multicast session The context of the second multicast session, where the context of the second multicast session includes information about the QoS flow of the first multicast service, and the second multicast session is corresponding to the first multicast service established by the source access network device Multicast session.
  • the communication method further includes: the source access network device obtains the first identifier from the context of the first terminal device or the multicast session corresponding to the first multicast service established by the source access network device Logo.
  • the source access network device can send the first identifier to the target access network device, and the first multicast service identified by the first identifier joined by the first terminal device can be switched to the target access network device. It is avoided to re-execute the process of joining the first multicast service after the first terminal device switches to the target access network device, thereby reducing the delay of the first multicast service caused by the switching of cross-access network devices.
  • a communication method and corresponding device are provided, and the solution is applied to a scenario where a first terminal device moves from a source access network device to a target access network device.
  • the first network device receives the information of the target access network device and the first identifier, and the first identifier is used to identify the first multicast service; the first network device according to the information of the target access network device and the first identifier , It is determined that the target access network device has not established a multicast session corresponding to the first multicast service; the first network device sends a third message, which is used to request the target access network device to establish the first multicast service corresponding to the first multicast service.
  • One multicast session is used to request the target access network device to establish the first multicast service corresponding to the first multicast service.
  • the first multicast session corresponding to the first multicast service can be established on the target access network device, and the data of the first multicast service can be established from the provider of the first multicast service to the target access network device. Therefore, the continuity of the first multicast service is ensured, and the delay of the multicast service caused by the switching of the first terminal device across the access network device is further reduced.
  • the third message includes at least one of the identifier of the first multicast session corresponding to the first multicast service and the second path information, where the second path information includes the multicast address and the second path information.
  • the second tunnel identifier, the multicast address is used for the target access network device to receive the data of the first multicast service through multicast, and the second tunnel identifier is used to identify the target access network device for receiving the first multicast service through multicast. Data multicast tunnel.
  • the target network device when the third message includes the identifier of the first multicast session, the target network device can subsequently be made to join the first terminal device to the first multicast session; when the third message includes the second path information, the target network device can be made
  • the access network device receives the data of the first multicast service according to the second path information, so as to transmit the data of the first multicast service to the first terminal device.
  • the communication method further includes: the first network device receives at least one of the identifier of the first multicast session corresponding to the first multicast service and the first path information, where the first path information includes the target The IP address of the access network device and the first tunnel identifier, where the first tunnel identifier is used to identify the unicast tunnel through which the target access network device receives the data of the first multicast service.
  • the first network device when receiving the identifier of the first multicast session, the first network device can subsequently modify the first multicast session according to the identifier of the first multicast session, etc.; when receiving the first path information, A tunnel between the user plane network element and the target access network device can be established for the data transmission of the first multicast service, so that the data of the first multicast service can be transmitted from the user plane network element to the target access network device, and then It is transmitted from the target access network device to the first terminal device.
  • the first network device sending the third message includes: when the target access network device is located within the service range of the first multicast service, the first network device sends the third message.
  • the communication method further includes: the first network device determines that the target access network device is located within the service range of the first multicast service according to the information of the target access network device.
  • the communication method further includes: the first network device obtains policy information of the first multicast service, and the policy information of the first multicast service includes the service range of the first multicast service.
  • the communication method further includes: the first network device receives a fourth message, the fourth message is used to request the first network device to allow the first terminal device to receive the first multicast through the target access network device Service data; the first network device sends third indication information, and the third indication information is used to indicate that the first terminal device is allowed to receive the data of the first multicast service through the target access network device.
  • the target access network device continues to send the data of the first multicast service to the first terminal device This can prevent the situation in which the first terminal device still sends the data of the first multicast service to the first terminal device when it is not allowed to receive the first multicast service.
  • the policy information of the first multicast service includes the identification of the terminal device that is allowed to receive the data of the first multicast service
  • the fourth message includes the identification of the first terminal device
  • the communication method further includes: When the identification of the terminal device that is allowed to receive the data of the first multicast service includes the identification of the first terminal device, the first network device determines that the first terminal is allowed to receive the data of the first multicast service through the target access network device.
  • a communication method and a corresponding device are provided, and the solution is applied to a scenario where a first terminal device moves from a source access network device to a target access network device.
  • the first session management network element receives first indication information and first identification information, where the first indication information is used to instruct the first terminal device to move to the target access network device, and the first identification information is the first identification or The identifier of the first PDU session, the first identifier is used to identify the first multicast service, the first PDU session is the PDU session used when the first terminal device joins the first multicast service; the first session management network element is based on the first The instruction information sends the information of the target access network device and the first identifier to the first network device.
  • the first network device can establish the first multicast service correspondence on the target access network device.
  • the first multicast session of the first multicast service is established, and the transmission path of the data of the first multicast service from the provider of the first multicast service to the target access network device is established, thereby ensuring the continuity of the first multicast service and further reducing the transmission path of the first multicast service.
  • the delay of the multicast service caused by the switching of a terminal device across the access network device.
  • the first identification information is an identifier of the first PDU session
  • the communication method further includes: the first session management network element obtains the first PDU session from the context corresponding to the first PDU session according to the identifier of the first PDU session.
  • the first session management network element obtains the first PDU session from the context corresponding to the first PDU session according to the identifier of the first PDU session.
  • the communication method further includes: the first session management network element receives the identifier of the first multicast session corresponding to the first multicast service from the first network device; the first session management network element sends the target The access network device sends the identifier of the first multicast session corresponding to the first multicast service, so that the target access network device adds the first terminal device to the first multicast session.
  • the communication method further includes: the first session management network element sends a fourth message to the first network device, the fourth message is used to request the first network device to allow the first terminal device to pass through the target access network
  • the device receives the data of the first multicast service; the first session management network element receives the third indication information from the first network device, and the third indication information is used to indicate that the first terminal is allowed to receive the first multicast through the target access network device Business data.
  • the target access network device continues to send the data of the first multicast service to the first terminal device This can prevent the situation in which the first terminal device still sends the data of the first multicast service to the first terminal device when it is not allowed to receive the first multicast service.
  • the communication method further includes: the first session management network element determines to allow the first terminal device to receive the data of the first multicast service through the target access network device.
  • the first session management network element determines that the first terminal device is allowed to receive the data of the first multicast service through the target access network device, including: the first session management network element obtains the policy of the first terminal device Information, the policy information of the first terminal device includes the area information in which the first terminal device receives the data of the first multicast service; when the target access network device is located in the area indicated by the area information, the first session management network element determines to allow the first A terminal device receives the data of the first multicast service through the target access network device.
  • the target access network device will continue to send the first multicast service to the first terminal device. This can prevent the first terminal device from sending the data of the first multicast service to the first terminal device when it is not allowed to receive the first multicast service.
  • the communication method further includes: the first session management network element receives information of the first QoS flow of the first multicast service from the target access network device, and the first QoS flow is the first group Some or all of the QoS flows in the QoS flow of the broadcast service. Based on this solution, the first session management network element candidate can perform charging and other processing based on the information of the first QoS flow.
  • a communication method and a corresponding device are provided, and the solution is applied to a scenario where a first terminal device moves from a source access network device to a target access network device.
  • the first session management network element receives first indication information and first identification information, where the first indication information is used to instruct the first terminal device to move to the target access network device, and the first identification information is the first identification or The identifier of the first PDU session, the first identifier is used to identify the first multicast service, the first PDU session is the PDU session used when the first terminal device joins the first multicast service; the first session management network element connects according to the target The information of the network access device and the first identification information determine that the target access network device has not established a multicast session corresponding to the first multicast service; the first session management network element sends the fifth message to the target access network device, the fifth message It is used to request the target access network device to establish the first multicast session corresponding to the first multicast service.
  • the first session management network element can establish a first multicast session corresponding to the first multicast service on the target access network device, and then establish the data of the first multicast service by the provider of the first multicast service The transmission path to the target access network device, thereby ensuring the continuity of the first multicast service, and further reducing the delay of the multicast service caused by the switching of the first terminal device across the access network device.
  • the fifth message includes at least one of the identifier of the first multicast session corresponding to the first multicast service and the second path information, where the second path information includes the multicast address and the second path information.
  • the second tunnel identifier, the multicast address is used for the target access network device to receive the data of the first multicast service through multicast, and the second tunnel identifier is used to identify the target access network device for receiving the first multicast service through multicast. Data multicast tunnel.
  • the target network device when the fifth message includes the identifier of the first multicast session, the target network device can subsequently be made to join the first terminal device to the first multicast session; when the second information of the first multicast service includes the second path In case of information, the target access network device can receive the data of the first multicast service according to the second path information, so as to transmit the data of the first multicast service to the first terminal device.
  • the communication method further includes: the first network device receives at least one of the identifier of the first multicast session corresponding to the first multicast service and the first path information, where the first path information includes the target The IP address of the access network device and the first tunnel identifier, where the first tunnel identifier is used to identify the unicast tunnel through which the target access network device receives the data of the first multicast service.
  • the first network device when receiving the identifier of the first multicast session, the first network device can subsequently modify the first multicast session according to the identifier of the first multicast session, etc.; when receiving the first path information, A tunnel between the user plane network element and the target access network device can be established for the data transmission of the first multicast service, so that the data of the first multicast service can be transmitted from the user plane network element to the target access network device, and then It is transmitted from the target access network device to the first terminal device.
  • the first session management network element determines that the target access network device has not established a multicast session corresponding to the first multicast service according to the information of the target access network device and the first identifier, including: The session management network element sends a sixth message to the fourth network device. The sixth message is used to query the multicast session corresponding to the first multicast service established by the target access network device. The sixth message includes the information of the target access network device and The first identifier; the first session management network element receives fourth indication information from the fourth network device, where the fourth indication information is used to indicate that the target access network device has not established a multicast session corresponding to the first multicast service.
  • the communication method further includes: the first session management network element sends a seventh message to the fourth network device, the seventh message is used to register the first multicast session to the fourth network device, and the seventh message is used to register the first multicast session to the fourth network device.
  • the message includes the information of the target access network device, the first identifier, and the identifier of the first multicast session.
  • the first session management network element sends the fifth message to the target access network device, including: when the target access network device is within the service range of the first multicast service, the first session management network Yuan sends the fifth message.
  • the communication method further includes: the first session management network element determines that the target access network device is located within the service range of the first multicast service according to the information of the target access network device.
  • the communication method further includes: the first session management network element obtains policy information of the first multicast service, and the policy information includes the service range of the first multicast service.
  • a communication device for implementing the above-mentioned various methods.
  • the communication apparatus may be the target access network device in the foregoing first aspect, or an apparatus including the foregoing target access network device; or, the communication apparatus may be the first network device in the foregoing second aspect or the fourth aspect, Or an apparatus including the foregoing first network device; or, the communication apparatus may be the source access network device in the foregoing third aspect, or an apparatus including the foregoing source access network device; or, the communication apparatus may be the foregoing fifth Aspect or the first session management network element in the sixth aspect, or an apparatus including the foregoing first session management network element.
  • the communication device includes corresponding modules, units, or means for implementing the above methods, and the modules, units, or menas can be implemented by hardware, software, or by hardware executing corresponding software.
  • the hardware or software includes one or more modules or units corresponding to the above-mentioned functions.
  • a communication device including: a processor, and may also include a memory; the memory is used to store computer instructions, and when the processor executes the instructions, the communication device can execute the instructions described in any of the above aspects.
  • the communication apparatus may be the target access network device in the foregoing first aspect, or an apparatus including the foregoing target access network device; or, the communication apparatus may be the first network device in the foregoing second aspect or the fourth aspect, Or an apparatus including the foregoing first network device; or, the communication apparatus may be the source access network device in the foregoing third aspect, or an apparatus including the foregoing source access network device; or, the communication apparatus may be the foregoing fifth Aspect or the first session management network element in the sixth aspect, or an apparatus including the foregoing first session management network element.
  • a communication device including: a processor; the processor is configured to couple with a memory, and after reading an instruction in the memory, execute the method according to any of the foregoing aspects according to the instruction.
  • the communication apparatus may be the target access network device in the foregoing first aspect, or an apparatus including the foregoing target access network device; or, the communication apparatus may be the first network device in the foregoing second aspect or the fourth aspect, Or an apparatus including the foregoing first network device; or, the communication apparatus may be the source access network device in the foregoing third aspect, or an apparatus including the foregoing source access network device; or, the communication apparatus may be the foregoing fifth Aspect or the first session management network element in the sixth aspect, or an apparatus including the foregoing first session management network element.
  • a computer-readable storage medium stores instructions that, when run on a computer, enable the computer to execute the method described in any of the above aspects.
  • a computer program product containing instructions which when run on a computer, enables the computer to execute the method described in any of the above aspects.
  • a communication device for example, the communication device may be a chip or a chip system
  • the communication device includes a processor for implementing the functions involved in any of the foregoing aspects.
  • the communication device further includes a memory for storing necessary program instructions and data.
  • the communication device is a chip system, it may be composed of chips, or may include chips and other discrete devices.
  • a communication device including: a processor and an interface circuit, the interface circuit may be a code/data read-write interface circuit, and the interface circuit is used to receive computer-executed instructions (computer-executed instructions are stored in a memory) , May be directly read from the memory, or may pass through other devices) and transmitted to the processor; the processor is used to run the computer-executable instructions to execute the method described in any of the foregoing aspects.
  • a communication method is provided.
  • the communication method is applied to a scenario where a first terminal device moves from a source access network device to a target access network device.
  • the communication method includes: the source access network device connects to the target access network device.
  • the network access device sends a first identifier, which is used to identify the first multicast service.
  • the target access network device receives the first identifier from the source access network device and determines the data of the first multicast service
  • the transmission mode between the target access network device and the first terminal device, the transmission mode includes a unicast mode or a multicast mode, after which the target access network device sends the wireless configuration corresponding to the transmission mode to the source access network device
  • the source access network device After receiving the wireless configuration information, the source access network device sends the wireless configuration information to the first terminal device.
  • the transmission mode is a multicast mode
  • the wireless configuration information includes scheduling indication information
  • the scheduling indication information is used to determine the scheduling information of the first multicast service
  • the scheduling information is used to instruct the transmission of the Radio resources of the first multicast service.
  • the communication method further includes: the target access network device receives signal measurement information from the target cell of the source access network device, the target cell belongs to the target access network device, and the target access network device
  • the device determining the transmission mode of the data of the first multicast service between the target access network device and the first terminal device includes: the target access network device determines the transmission according to the signal measurement information and/or the first quantity In this manner, the first number is the number of terminal devices that receive the data of the first multicast service through the target access network device.
  • the communication method further includes: the target access network device sends a first message to the first network device, the first message includes the first identifier, and the first message is used to request the establishment of the first network device.
  • the first network device receives the first message, and when the target access network device is located within the service range of the first multicast service, the first network device establishes the first multicast corresponding to the first multicast service Conversation.
  • the first message further includes first information about the first multicast service, and the first information about the first multicast service includes: an identifier of the first multicast session and first path information At least one item in, wherein the first path information includes an IP address of the target access network device and a first tunnel identifier, and the first tunnel identifier is used to identify that the target access network device receives the first multicast service Unicast tunnel of the data.
  • the communication method further includes: the target access network device receives second information of the first multicast service, and the second information of the first multicast service includes: the first multicast session At least one of the identifier of the target access network device and the second path information, wherein the second path information includes a multicast address and a second tunnel identifier, and the multicast address is used by the target access network device to receive the first path in a multicast manner.
  • the second tunnel identifier is used to identify the multicast tunnel through which the target access network device receives the data of the first multicast service in a multicast manner.
  • the target access network device sends first indication information and third information of the first multicast service, and the first indication information is used to instruct the first terminal device to move to the target access Network equipment, the third information of the first multicast service includes: the first identifier, the identifier of the first multicast session corresponding to the first multicast service, and information about the first QoS flow of the first multicast service At least one item of, wherein the first QoS flow is a part or all of the QoS flows of the first multicast service.
  • the communication method further includes: the first network device receives information of the target access network device and a first identifier, where the first identifier is used to identify the first multicast service; the first network device According to the information of the target access network device and the first identifier, it is determined that the target access network device has not established a multicast session corresponding to the first multicast service; the first network device sends a third message, the third message It is used to request the target access network device to establish a first multicast session corresponding to the first multicast service.
  • the communication method further includes: the first session management network element receives first indication information and first identification information, where the first indication information is used to instruct the first terminal device to move to the target access network Device, where the first identification information is a first identifier or an identifier of a first PDU session, the first identifier is used to identify a first multicast service, and the first PDU session is for the first terminal device to join the first multicast service PDU session used at the time; the first session management network element sends the information of the target access network device and the first identifier to the first network device according to the first indication information.
  • the first indication information is used to instruct the first terminal device to move to the target access network Device
  • the first identification information is a first identifier or an identifier of a first PDU session
  • the first identifier is used to identify a first multicast service
  • the first PDU session is for the first terminal device to join the first multicast service PDU session used at the time
  • the first session management network element sends the information of the target access network
  • the communication method further includes: the first session management network element receives first indication information and first identification information, where the first indication information is used to instruct the first terminal device to move to the target access Network equipment, where the first identification information is a first identification or an identification of a first PDU session, the first identification is used to identify a first multicast service, and the first PDU session is for the first terminal device to join the first multicast The PDU session used during the service; the first session management network element determines, according to the information of the target access network device and the first identification information, that the target access network device has not established the multicast corresponding to the first multicast service Session; the first session management network element sends a fifth message to the target access network device, the fifth message is used to request the target access network device to establish a first multicast session corresponding to the first multicast service.
  • a communication system in a fifteenth aspect, includes a target access network device and a source access network device.
  • the target access network device is used to perform the steps in the first aspect described above, or the steps performed by the target access network device in the solution provided in this embodiment of the application;
  • the source access network device is used to perform the third aspect described above, or The steps performed by the source access network device in the solution provided in the embodiment of the present application.
  • the communication system may further include a first network device, or a first session management network element, and the first network device is used to perform the above-mentioned second aspect or fourth aspect, or an embodiment of the present application
  • the steps performed by the first network device in the provided solution; the first session management network element is used to perform the steps in the fifth aspect or the sixth aspect described above, or the steps performed by the first network device in the solution provided in the embodiments of this application .
  • the communication system may also include the solution provided in the embodiment of this application with the target access network device, or the source access network device, or the first network device, or the first session management network element.
  • Other interactive devices such as the second network device, the third network device, or the fourth network device, or the user plane network element, are not specifically limited in the embodiment of the present application.
  • Fig. 1a is a first structural diagram of a communication system provided by an embodiment of this application.
  • FIG. 1b is a second structural diagram of a communication system provided by an embodiment of this application.
  • FIG. 1c is a third structural diagram of a communication system provided by an embodiment of this application.
  • Fig. 2a is a schematic diagram 1 of the application of the communication system provided by an embodiment of the application in a 5G network;
  • 2b is a second schematic diagram of the application of the communication system provided by the embodiment of this application in a 5G network;
  • FIG. 2c is the third schematic diagram of the application of the communication system provided by the embodiment of the application in the 5G network;
  • FIG. 3 is a schematic diagram of the hardware structure of a communication device provided by an embodiment of the application.
  • FIG. 4 is a first schematic flowchart of a communication method provided by an embodiment of this application.
  • FIG. 5 is a second schematic flowchart of a communication method provided by an embodiment of this application.
  • FIG. 6 is a third schematic flowchart of a communication method provided by an embodiment of this application.
  • FIG. 7 is a fourth schematic flowchart of a communication method provided by an embodiment of this application.
  • FIG. 8 is a fifth schematic flowchart of a communication method provided by an embodiment of this application.
  • FIG. 9 is a sixth schematic flowchart of a communication method provided by an embodiment of this application.
  • FIG. 10 is a schematic diagram 1 of the interaction process of a communication method provided by an embodiment of this application.
  • FIG. 11 is a schematic diagram 2 of the interaction process of a communication method provided by an embodiment of this application.
  • FIG. 12 is a third schematic diagram of the interaction process of a communication method provided by an embodiment of this application.
  • FIG. 13 is a schematic diagram 4 of the interaction process of a communication method provided by an embodiment of this application.
  • FIG. 14 is a schematic diagram 5 of the interaction process of a communication method provided by an embodiment of this application.
  • 15 is a schematic diagram 6 of the interaction process of a communication method provided by an embodiment of this application.
  • FIG. 16 is a schematic structural diagram of a target access network device provided by an embodiment of this application.
  • FIG. 17 is a schematic structural diagram of a first network device provided by an embodiment of this application.
  • FIG. 18 is a schematic structural diagram of a first session management network element provided by an embodiment of this application.
  • FIG. 19 is a schematic structural diagram of a source access network device provided by an embodiment of this application.
  • At least one item (a) refers to any combination of these items, including any combination of a single item (a) or a plurality of items (a).
  • at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple .
  • words such as “first” and “second” are used to distinguish the same or similar items with substantially the same function and effect. Those skilled in the art can understand that words such as “first” and “second” do not limit the quantity and execution order, and words such as “first” and “second” do not limit the difference.
  • the communication method provided in the embodiments of the present application is applicable to various system architectures.
  • the network architecture and business scenarios described in the embodiments of this application are intended to more clearly illustrate the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided in the embodiments of this application.
  • Those of ordinary skill in the art will know that with the network With the evolution of the architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are equally applicable to similar technical problems.
  • the communication system 10a includes a source access network device 101, a target access network device 102, and a first terminal device 103. Among them, as shown in Figure 1a, before the first terminal device 103 moves, the first terminal device 103 accesses the network through the source access network device 101; when the first terminal moves (or switches), the first terminal device 103 accesses the network through the target access device 102.
  • the target access network device 102 is used to receive a first identifier from the source access network device 101, the first identifier is used to identify the first multicast service; the target access network device 102 is also used to determine the first multicast service
  • the transmission mode of service data between the target access network device 102 and the first terminal device.
  • the transmission mode includes unicast mode or multicast mode; the target access network device 102 is also used to transmit data to the source access network device 101.
  • the first terminal device 103 sends the wireless configuration information corresponding to the transmission mode.
  • the source access network device 101 is used to send a first identifier to the target access network device 102 and receive wireless configuration information from the target access network device 102; the source access network device 101 is also used to send to the first terminal device 103 The wireless configuration information.
  • the source access network device before the first terminal device moves from the source access network device to the target access network device, the source access network device sends to the target access network device a message for identifying the first multicast service The first identifier, so that the target access network device can determine the transmission mode of the first multicast service data between the target access network device and the first terminal device, and send the wireless configuration corresponding to the transmission mode to the source access network device Information, and further, the source access network device may send the wireless configuration information to the first terminal device.
  • the wireless configuration information sent by the device is configured.
  • the wireless configuration information used in the transmission of the multicast service can be sent to the first terminal device, thereby reducing the burden on the first terminal device. The delay of the multicast service caused by the device switching across the access network.
  • the source access network device 101 or the target access network device 102 described above is a device that provides the first terminal device 103 with a wireless communication function.
  • the source access network device 101 or the target access network device 102 includes, but is not limited to, for example, the next generation base station (gnodeB, gNB) in the fifth generation (5G) (for example, the source access network device 101 is S-gNB).
  • gnodeB next generation base station
  • gNB next generation base station
  • 5G fifth generation
  • the target access network device 102 is a T-gNB), an evolved node B (evolved node B, eNB) (for example, the source access network device 101 is an S-eNB, and the target access network device 102 is a T-eNB), wireless Network controller (radio network controller, RNC) (for example, source access network device 101 is S-RNC, target access network device 102 is S-RNC), node B (node B, NB) (for example, source access network device 101 is S-NB, target access network device 102 is S-NB), base station controller (BSC) (for example, source access network device 101 is S-BSC, target access network device 102 is T- BSC), base transceiver station (base transceiver station, BTS) (for example, the source access network device 101 is S-BTS, and the target access network device 102 is S-BTS), home base stations (for example, home evolved nodeB, or home node B, HNB) (for example, the source access network device
  • the aforementioned first terminal device 103 is a device with a wireless transceiver function, such as a terminal or a chip that can be used in a terminal.
  • the first terminal device 103 can be deployed on land, including indoor or outdoor, handheld or vehicle-mounted; it can also be deployed on the water (such as a ship, etc.); it can also be deployed in the air (such as an airplane, a balloon, a satellite, etc.).
  • the terminal may be a user equipment (UE), an access terminal, a terminal unit, a terminal station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, and wireless communication in a 5G network or a future evolved PLMN.
  • the access terminal can be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), with wireless communication Functional handheld devices, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices or wearable devices, virtual reality (VR) terminal devices, augmented reality (AR) terminal devices, industrial control (industrial) Wireless terminal in control), wireless terminal in self-driving (self-driving), wireless terminal in remote medical (remote medical), wireless terminal in smart grid (smart grid), wireless terminal in transportation safety (transportation safety) Terminals, wireless terminals in smart cities, wireless terminals in smart homes, etc.
  • the terminal can be mobile or fixed.
  • the communication system 10b may include the source access network device 101, the target access network device 102, and the first terminal device in Fig. 1a.
  • the first network device 201 and the first session management network element 202 may also be included.
  • the first network device 201 is configured to receive a first message, the first message includes a first identifier, the first identifier is used to identify the first multicast service, and the first message is used by the target access network device 102 to request the establishment of the first multicast service.
  • the first network device 201 is configured to receive information and a first identifier of the target access network device 102, where the first identifier is used to identify the first multicast service; the first network device 201 is also used to receive information according to the target access network 102 Information and the first identifier, it is determined that the target access network device 102 has not established a multicast session corresponding to the first multicast service; the first network device 201 is also used to send a third message, which is used to request the target access The network access device 102 establishes a first multicast session corresponding to the first multicast service.
  • the first session management network element 202 is configured to receive first indication information and first identification information, where the first indication information is used to instruct the first terminal device 103 to move to the target access network device 102, and the first identification information is the first An identifier or identifier of the first PDU session, where the first identifier is used to identify the first multicast service, and the first PDU session is the PDU session used when the first terminal device 103 joins the first multicast service.
  • the first session management network element 202 is further configured to send the information of the target access network device 102 and the first identifier to the first network device 201 according to the first indication information.
  • the first session management network element 202 is configured to receive first indication information and first identification information, where the first indication information is used to instruct the first terminal device 103 to move to the target access network device 102, and the first identification information is the first An identifier or an identifier of the first PDU session, the first identifier is used to identify the first multicast service, and the first PDU session is the PDU session used when the first terminal device 103 joins the first multicast service; the first session management network Element 202 is further configured to determine, according to the information of the target access network device 102 and the first identification information, that the target access network device 102 has not established a multicast session corresponding to the first multicast service;
  • the first session management network element 202 is further configured to send a fifth message to the target access network device 102, where the fifth message is used to request the target access network device 102 to establish a first multicast session corresponding to the first multicast service.
  • the first multicast session corresponding to the first multicast service can be established on the target access network device, and the data of the first multicast service can be established by the source of the first multicast service.
  • a transmission path from a device for example, a content provider (CP)
  • CP content provider
  • the first network device 201 may also be used for session management in the mobile network, such as session establishment, modification, and release.
  • the network element or entity corresponding to the first network device 201 may be a session management function (SMF) network element in the 5G network architecture, or multicast control A function (multicast control function, MCF) network element, or a multicast session management function (multicast session management function, M-SMF) network element specifically responsible for multicast service management and control.
  • the MCF network element can be integrated into a policy control function (PCF) network element.
  • PCF policy control function
  • the first network device 201 can still be an SMF network element, or an MCF network element, or an M-SMF network element, or the first network device 201 has other
  • the name is not limited in the embodiment of this application.
  • the first session management network element 202 may also be used for session management in the mobile network, such as session establishment, modification, and release.
  • the network element or entity corresponding to the first network device 201 may be a session management function (SMF) network element in the 5G network architecture.
  • SMS session management function
  • the first session management network element 202 may still be an SMF network element, or the first session management network element 202 may have other names. This embodiment of the application There is no restriction on this.
  • the first network device 201 and the first session management network element 202 in FIG. 1b may also include a second network device 301, a third network device 302, a policy control network element 303, an application function network element 304, and a multicast user Surface network element 305 and so on.
  • the second network device 301 is mainly used for packet routing and forwarding, quality of service (QoS) processing of user plane data, and so on.
  • the network element or entity corresponding to the second network device 301 may be a user plane function (UPF) network element in the 5G network architecture, or a multicast user Multicast user plane function (M-UPF) network element, or multicast user plane function (multicast user plane function, MUF) network element.
  • UPF user plane function
  • M-UPF multicast user Multicast user plane function
  • MUF multicast user plane function
  • future communications such as the 6th generation (6G) communication system
  • the second network device 301 can still be a UPF network element, or an M-UPF network element, or a MUF network element, or the second network device 301 can There are other names, which are not limited in the embodiments of this application.
  • the third network device 302 is used for mobility management in the mobile network, such as user location update, user registration network, user switching, and so on.
  • the network element or entity corresponding to the third network device 302 can be the access and mobility management function (AMF) network in the 5G network architecture. Yuan, or a multicast access and mobility management function (multicast access and mobility management function, M-AMF) network element specifically responsible for multicast services.
  • M-AMF multicast access and mobility management function
  • future communications such as the 6th generation (6G) communication system, the third network device 302 can still be an AMF network element or an M-AMF network element, or the third network device 302 has other names. This application implements The example does not limit this.
  • the policy control network element 303 is used for policy control and charging rule management.
  • the network element or entity corresponding to the policy control network element 303 can be a policy control function (PCF) network element in the 5G network architecture, or a network element specifically responsible for grouping The multicast policy control function (M-PCF) network element of the broadcast service.
  • PCF policy control function
  • M-PCF multicast policy control function
  • the policy control network element 303 can still be a PCF network.
  • the policy control network element 303 has other names, which are not limited in the embodiment of the present application.
  • the application function network element 304 is mainly used to provide application layer information to the 3GPP network.
  • the application function network element 304 may also be referred to as a content provider (CP).
  • the application function network element 304 may be an application function (AF) network element.
  • the application function network element 304 may still be an AF network element or have other names.
  • the AF network element may include, for example, a service capability server (services capability server, SCS) or an application server (application server, AS).
  • the multicast user plane network element 305 is used to deliver multicast messages, that is, the multicast message received from the application function network element 304 is sent to the second network device 301 of the downstream node.
  • the network element or entity corresponding to the multicast user plane network element 305 can be a UPF network element or a MUF network element in the 5G network architecture.
  • communication will be like the sixth generation.
  • the multicast user plane network element 305 may still be a UPF network element or a MUF network element, or the multicast user plane network element 305 has other names, which are not limited in the embodiment of this application .
  • FIG. 2a taking a 5G communication system as an example, a schematic diagram of a specific possible network architecture applicable to the embodiments of this application, including the above-mentioned first terminal device, source access network device, and target access network device ( Figure 2a is uniformly represented by gNB), SMF network element, AMF network element, PCF network element, AF network element, and UPF network element.
  • the AF network element can directly communicate with the PCF network element, or it can also use the network opening function ( The network exposure function (NEF) network element (not shown in Figure 2a) communicates with the PCF network element.
  • the network architecture can also include MCF network elements and UPF network elements.
  • MCF network elements can interface with AF network elements and PCF network elements
  • MUF network elements can interface with AF network elements and M-UPF network elements for transmission. For multicast messages, MCF network elements can also interface with MUF network elements.
  • FIG. 2b taking a 5G communication system as an example, it is a schematic diagram of another specific possible network architecture applicable to the application embodiment, including the above-mentioned first terminal device, source access network device, and target access network device ( Figure 2b In the unified use of gNB), AMF network element, SMF network element, UPF network element, M-AMF network element, M-SMF network element, PCF network element, M-UPF network element, and AF network element, among them, AF network
  • the element can directly communicate with the PCF network element, or it can also communicate with the PCF network element through a network exposure function (NEF) network element (not shown in FIG. 2b).
  • the network architecture can also include MCF network elements and MUF network elements.
  • MCF network elements can interface with AF network elements and PCF network elements, and MUF network elements can interface with AF network elements and M-UPF network elements for transmission.
  • MCF network elements can also interface with MUF network elements.
  • the UPF network element is only responsible for the data transmission of the unicast service of the first terminal device.
  • the multicast service is sent to the first terminal device through the AP, MUF network element, M-UPF network element, and gNB, and the PCF network element obtains it according to the MCF network element.
  • M-AMF network elements and M-SMF network elements are used to create and manage multicast sessions.
  • SMF network elements interface with PCF network elements (or interface with MCF network elements, Not shown in Figure 2b) Obtain multicast service information, so as to join the first terminal device to the multicast group.
  • FIG. 2c another specific possible network architecture diagram applicable to the embodiments of this application includes the above-mentioned first terminal device, source access network device, and target access network device (Figure In 2c, it is uniformly denoted by gNB), AMF network element, SMF network element, M-AMF network element, PCF network element, MCF network element, MUF network element and AF network element, etc., optional, can also include M-SMF network Yuan and M-UPF network element.
  • the AF network element interfaces with the PCF network element (or interface with the network exposure function (NEF) network element, not shown in FIG. 2c), so as to send the multicast service information to the PCF network element. If the AF network element interfaces with the NEF network element, the AF network element first sends the multicast service information to the NEF network element, and then the NEF network element sends it to the PCF.
  • NEF network exposure function
  • the above-mentioned network elements or functions may be network elements in hardware devices, software functions running on dedicated hardware, or virtualization functions instantiated on a platform (for example, a cloud platform).
  • the above-mentioned network elements or functions can be divided into one or more services, and further, there may be services independent of network functions.
  • an instance of the above-mentioned function, an instance of a service included in the above-mentioned function, or an instance of a service that exists independently of the network function may be referred to as a service instance.
  • FIG. 3 is a schematic diagram of the hardware structure of a communication device provided by an embodiment of the application.
  • the communication device 300 includes a processor 301, a communication line 302, a memory 303, and at least one communication interface (in FIG. 3, the communication interface 304 is included as an example for illustration).
  • the processor 301 may be a general-purpose central processing unit (central processing unit, CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more programs for controlling the execution of the program of this application. integrated circuit.
  • CPU central processing unit
  • ASIC application-specific integrated circuit
  • the communication line 302 may include a path to transmit information between the aforementioned components.
  • the communication interface 304 uses any device such as a transceiver to communicate with other devices or communication networks, such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc. .
  • RAN radio access network
  • WLAN wireless local area networks
  • the memory 303 may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory (RAM), or other types that can store information and instructions
  • the dynamic storage device can also be electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disk storage, optical disc storage (Including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or can be used to carry or store desired program codes in the form of instructions or data structures and can be used by a computer Any other media accessed, but not limited to this.
  • the memory can exist independently and is connected to the processor through the communication line 302. The memory can also be integrated with the processor.
  • the memory 303 is used to store computer-executed instructions for executing the solution of the present application, and the processor 301 controls the execution.
  • the processor 301 is configured to execute computer-executable instructions stored in the memory 303, so as to implement the communication method provided in the following embodiments of the present application.
  • the computer-executable instructions in the embodiments of the present application may also be referred to as application program codes, which are not specifically limited in the embodiments of the present application.
  • the processor 301 may include one or more CPUs, such as CPU0 and CPU1 in FIG. 3.
  • the communication device 300 may include multiple processors, such as the processor 301 and the processor 308 in FIG. 3. Each of these processors can be a single-CPU (single-CPU) processor or a multi-core (multi-CPU) processor.
  • the processor here may refer to one or more devices, circuits, and/or processing cores for processing data (for example, computer program instructions).
  • the communication device 300 may further include an output device 305 and an input device 306.
  • the output device 305 communicates with the processor 301 and can display information in a variety of ways.
  • the output device 305 may be a liquid crystal display (LCD), a light emitting diode (LED) display device, a cathode ray tube (CRT) display device, or a projector (projector) Wait.
  • the input device 306 communicates with the processor 301, and can receive user input in a variety of ways.
  • the input device 306 may be a mouse, a keyboard, a touch screen device, a sensor device, or the like.
  • the aforementioned communication device 300 may be a general-purpose device or a special-purpose device.
  • the communication device 300 may be a desktop computer, a portable computer, a network server, a personal digital assistant (PDA), a mobile phone, a tablet computer, a wireless terminal device, an embedded device, or a similar structure in Figure 3 equipment.
  • PDA personal digital assistant
  • the embodiment of the present application does not limit the type of the communication device 300.
  • the embodiment of the present application is not limited to the 5G network architecture shown in FIG. 2a or FIG. 2b or FIG. 2c, and may also be applied to other future communication systems, such as 6G network architecture.
  • the names of the network elements used in the embodiments of the present application may maintain the same function in the future communication system, but the names will change.
  • the communication method provided in this application is introduced from the side of each network element involved in the embodiments of this application.
  • the communication method includes the following steps:
  • the target access network device receives a first identifier from the source access network device.
  • the first identifier is used to identify the first multicast service.
  • the first multicast service may be a multicast service that the first terminal device joins before it moves, or the first multicast service is a service received through the source access network device before the first terminal device moves, or the first multicast service
  • the multicast service is a service currently performed by the first terminal device.
  • the first multicast service may be a multimedia broadcast multicast service (MBMS), such as a live video service, or the first multicast service may also be other services, such as a vehicle to everything (V2X) ) Or Internet of Things (IoT) data transmission services, or public safety (Public Safety) related data transmission services, etc., which are not specifically limited in the embodiment of the present application.
  • MBMS multimedia broadcast multicast service
  • V2X vehicle to everything
  • IoT Internet of Things
  • Public Safety Public Safety
  • the target access network device determines a transmission mode of the data of the first multicast service between the target access network device and the first terminal device.
  • the transmission mode includes unicast mode or multicast mode.
  • the target access network device may use the following multiple methods to determine the transmission mode of the data of the first multicast service between the target access network device and the first terminal device:
  • the target access network device may determine the transmission mode of the data of the first multicast service between the target access network device and the first terminal device according to the first quantity, where the first quantity is through The number of terminal devices from which the target access network device receives the data of the first multicast service.
  • the target access network device may determine The transmission mode is unicast; when the first number is greater than the first threshold, it means that there are more terminal devices that receive the first multicast service through the target access network device. In order to reduce the transmission overhead, the target access network device can determine this The transmission mode is a multicast mode, and when the first number is equal to the first threshold, the target access network device may determine that the transmission mode is a unicast mode or a multicast mode.
  • the terminal device that receives the data of the first multicast service through the target access network device is included in the first multicast service. Before a terminal device is switched to the target access network device, the terminal device that receives the data of the first multicast service through the target access network device. In addition, the terminal device that receives the data of the first multicast service through the target access network device is also It may include a terminal device that requests to switch to the target access network device and joins the first multicast service.
  • the target access network device may receive signal measurement information from the target cell of the source access network device, and the target cell belongs to the target access network device. At this time, the target access network device determines the above The transmission mode may be: the target access network device determines the transmission mode according to the signal measurement information of the target cell.
  • the signal measurement information of the target cell may include signal strength information between the first terminal device and the target cell.
  • the signal strength indicated by the signal strength information is greater than the second threshold, it indicates that the signal strength between the first terminal device and the target cell is greater than the second threshold.
  • the signal strength is relatively strong during the period.
  • the multicast transmission method will not increase additional overhead.
  • the target access network device can determine that the transmission method is the multicast method; when the signal strength indicated by the signal strength information is less than the second threshold , Indicating that the signal strength between the first terminal device and the target cell is weak.
  • the signal strength of the first terminal device adjusts the signal strength of the data for sending the first multicast service, resulting in excessive power, thereby increasing power consumption, and the target access network device may determine that the transmission mode is a unicast mode.
  • the target access network device may determine the foregoing transmission mode according to the first number and the signal measurement information of the target cell. For example, when the first number is greater than the first threshold, and the signal strength between the first terminal device and the target cell is greater than the second threshold, the target access device may determine that the transmission mode is multicast; otherwise, the target access network device Make sure that the transmission mode is unicast.
  • the target access network device may determine the foregoing transmission mode according to the second number and signal measurement information of the target cell, where the second number is the number of users receiving the first multicast service through the target access network device.
  • the second number is the number of users receiving the first multicast service through the target access network device.
  • the target access device may determine that the transmission mode is multicast; otherwise, the target access network device Make sure that the transmission mode is unicast.
  • the foregoing first threshold and/or second threshold may be determined by the target access network device, or may be stipulated in an agreement, which is not specifically limited in the embodiment of the present application.
  • the first threshold and/or the second threshold may change according to the load of the target access network device and other conditions.
  • the transmission mode of the first multicast service data determined by the target access network device between the target access network device and the first terminal device, and the transmission mode of the first multicast service data between the target access network device and the first terminal device can be the same or different.
  • the second terminal device is one or more terminal devices other than the first terminal device that receives data of the first multicast service through the target access network device.
  • the target access network device can reasonably and flexibly determine the first multicast service based on the signal measurement information of the target cell and/or the number of terminal devices that receive the data of the first multicast service through the target access network device.
  • the target access network device sends to the first terminal device through the source access network device, wireless configuration information corresponding to the transmission mode of the data of the first multicast service between the target access network device and the first terminal device.
  • the wireless configuration information corresponding to the transmission mode may include one or more of the following: radio link control (RLC) layer configuration information, media access control (MAC) layer configuration information , Packet data convergence protocol (packet data convergence protocol, PDCP) layer configuration information, data radio bearer identifier (DRB ID).
  • RLC radio link control
  • MAC media access control
  • PDCP Packet data convergence protocol
  • DRB ID data radio bearer identifier
  • the RLC layer configuration information may configure the RLC layer protocol used by the first terminal device to receive the first multicast service, for example, determine the transmission mode (confirmed mode or non-confirmed mode) used by the RLC; MAC layer configuration information
  • the MAC layer protocol used by the first terminal device to receive the first multicast service can be configured, for example, the logical channel identifier (LC ID) corresponding to the DRB can be configured; the PDCP layer configuration information can be configured for the first terminal device Receive the PDCP layer protocol of the first multicast service, such as whether header compression is supported or not.
  • LC ID logical channel identifier
  • the PDCP layer configuration information can be configured for the first terminal device Receive the PDCP layer protocol of the first multicast service, such as whether header compression is supported or not.
  • the wireless configuration information includes, in addition to one or more of the foregoing, scheduling indication information, and the scheduling indication information is used to determine the scheduling information of the first multicast service, The scheduling information is used to indicate the radio resource for transmitting the first multicast service.
  • the first terminal device can subsequently determine the wireless resource for transmitting the first multicast service according to the scheduling indication information, and receive the data of the first multicast service on the wireless resource.
  • the scheduling indication information may be, for example, a group radio network temporary identifier (G-RNTI), or may be an identifier similar to G-RNTI.
  • G-RNTI group radio network temporary identifier
  • the target access network device may receive information about the quality of service (QoS) flow of the first multicast service from the source access network device, and perform the information according to the QoS flow of the first multicast service.
  • QoS quality of service
  • the QoS flow information of the first multicast service may include one or more quality of service flow identifiers (QoS flow identifiers, QFIs) and QoS parameters corresponding to each QFI (such as 5QI, bandwidth requirements, etc.), where , A QFI is used to identify a QoS flow.
  • QFI quality of service flow identifiers
  • the target access network device can determine the mapping between QFI to DRB and create the DRB according to the QoS parameters corresponding to each QFI, and determine the QoS flow location for transmitting the first multicast service according to the QoS parameters corresponding to each QFI.
  • the target access network device can also determine the configuration parameters corresponding to the DRB according to the QoS parameters corresponding to the QFI mapped by each DRB, for example, whether the RLC layer corresponding to the DRB adopts the confirmed mode or the non-confirmed mode Wait.
  • the target access network device may obtain the wireless configuration information corresponding to the transmission mode from the context of the first multicast service, and send it to the first terminal device through the source access network device.
  • the target access network device obtains the wireless configuration information corresponding to the transmission mode according to the information of the QoS flow of the first multicast service, due to limited wireless resources, it may not be possible to create a corresponding DRB for each QoS flow. Therefore, part of the QoS flow of the first multicast service cannot be transmitted through the target access network device.
  • a QoS flow that successfully creates a DRB is called a QoS flow that is successfully switched
  • a QoS flow that fails to create a DRB is called a QoS flow that fails to switch. Go into details.
  • the target access network device before the first terminal device moves from the source access network device to the target access network device, the target access network device can determine that the data of the first multicast service is in the target access network device and The first terminal device transmits the wireless configuration information corresponding to the transmission method to the source access network device, and further enables the source access network device to send the wireless configuration information to the first terminal device. Subsequently, when the first terminal device moves to the target access network device or switches to the target access network device, there is no need to wait for the target access network device to issue configuration information, but according to the target access network device passing through the source access network device before the handover The wireless configuration information sent by the device is configured.
  • the wireless configuration information used in the transmission of the multicast service can be sent to the first terminal device, so that the first terminal device The configuration is performed to reduce the delay of the multicast service caused by the first terminal device switching across the access network device.
  • the communication method includes the following steps:
  • S501 The source access network device sends a first identifier to the target access network device.
  • the first identifier is used to identify the first multicast service, and the related description of the first multicast service can refer to the above step S401, which will not be repeated here.
  • the source access network device may obtain the first identifier from the context of the first terminal device.
  • the source access network device receives wireless configuration information from the target access network device.
  • the wireless configuration information corresponds to the transmission mode of the data of the first multicast service between the target access network device and the first terminal device, and the transmission mode includes a unicast mode or a multicast mode, and the wireless configuration information is related
  • the description can refer to the above step S403, which will not be repeated here.
  • the source access network device sends the wireless configuration information to the first terminal device.
  • the communication method further includes: the source access network device sends measurement information of the target cell to the target access network device, so that the target access network device Determine the data of the first multicast service according to the signal measurement information of the target cell.
  • the communication method further includes: the source access network device sends the QoS flow information of the first multicast service to the target access network device.
  • the information of the QoS flow of the first multicast service may be included in the context of the second multicast session, and the second multicast session is the multicast session corresponding to the first multicast service established by the source access network device. Therefore, the source access network device can obtain the context of the second multicast session according to the first identifier, or obtain the context of the second multicast session according to the identifier of the second multicast session, and then obtain the QoS of the first multicast service. Stream information.
  • the identifier of the second multicast session may be obtained by the source access network device from the context of the first terminal device.
  • the communication method includes the following steps:
  • the first network device receives the first message.
  • the first message includes a first identifier, the first identifier is used to identify the first multicast service, and the first message is used by the target access network device to request the establishment of the first multicast session corresponding to the first multicast service.
  • the first message may be, for example, an extended existing message (for example, a Path Switch Request Transfer (Path Switch Request Transfer) message), or a newly defined message.
  • an extended existing message for example, a Path Switch Request Transfer (Path Switch Request Transfer) message
  • a newly defined message for example, a Path Switch Request Transfer (Path Switch Request Transfer) message
  • the first network device establishes a first multicast session corresponding to the first multicast service.
  • the first network device when the target access network device is located within the service range of the first multicast service, the first network device establishes the first multicast session corresponding to the first multicast service.
  • the target access network device is located in the service range of the first multicast service, which can be understood as the service range of the target access network device is located in the service range of the first multicast service, or the service range of the first multicast service
  • the service range includes the service range of the target access network device; alternatively, it can also be understood as the intersection of the service range of the target access network device and the service range of the first multicast service.
  • the first multicast session corresponding to the first multicast service can be established on the target access network device, and the data of the first multicast service can be established by the provider of the first multicast service (for example, AF network element). ) A transmission path to the target access network device, thereby ensuring the continuity of the first multicast service, and further reducing the delay of the multicast service caused by the switching of the first terminal device across the access network device.
  • the provider of the first multicast service for example, AF network element
  • the communication method includes the following steps:
  • the first network device receives the information of the target access network device and the first identifier.
  • the information of the target access network device may include one or more of the following: the identity of the target access network device, the identity of the first cell, and the tracking area identity (TAI).
  • the first cell belongs to the target access network device, and the first cell may be the target cell, or may be a cell belonging to the target access network device other than the target cell.
  • the tracking area identifier is the tracking area identifier supported by the target access network device.
  • the target access network device since the first terminal device can switch to the target access network device, when the first terminal device and the target access network device perform the handover process or successfully switch to the target access network device, the target access network device
  • the information of the device can also be understood as the location information of the first terminal device. Therefore, in this embodiment of the present application, the information of the target access network device and the location information of the first terminal device can be replaced with each other. The embodiments will not be repeated.
  • the location information of the terminal device may include one or more of the following: the identity of the cell that the terminal device has successfully accessed or is trying to access, and the terminal device has successfully accessed or is trying to access.
  • the first network device determines, according to the information of the target access network device and the first identifier, that the target access network device has not established a multicast session corresponding to the first multicast service.
  • the target access network device does not establish a multicast session corresponding to the first multicast service, and it can also be understood that there is no multicast session corresponding to the first multicast service on the target access network device. Conversations are described here in a unified manner, and the following embodiments will not be repeated.
  • the first network device may determine that the target access network device has not established a multicast session corresponding to the first multicast service in a variety of ways according to the information and the first identifier of the target access network device:
  • the first network device may store information about the established multicast session, where the information about the multicast session may include the identifier of the multicast session, the information of the access network device corresponding to the multicast session, The identifier of the multicast service corresponding to the multicast session.
  • the first network device After receiving the information of the target access network device and the first identifier, the first network device queries the information of the established multicast session. If there is a multicast session, it also corresponds to the target access network device's information.
  • the information and the first identifier that is, the identifier of the multicast service corresponding to the multicast session is the same as the first identifier, and the information of the access network device corresponding to the multicast session includes the information of the target access network, the first network device determines The target access network device has already established a multicast session corresponding to the first multicast service; otherwise, the first network device determines that the target access network device has not established a multicast session corresponding to the first multicast service.
  • the first network device determines that the target access network device has not established a multicast session corresponding to the first multicast service as an example for description.
  • the first network device may send information to a network element (for example, a unified data management (UDM) network element, a PCF network element, or a unified data management) that stores information about an established multicast session.
  • a network element for example, a unified data management (UDM) network element, a PCF network element, or a unified data management
  • UDM unified data management
  • PCF PCF
  • a unified data management unified data management
  • the first network device determines that the target access network device has established the multicast session corresponding to the first multicast service; if the response message returned by the UDM network element indicates that the target access network device is not found to establish Or the response message returned by the UDM network element indicates that the target access network device has not established the multicast session corresponding to the first multicast service, the first network device determines that the target access network device has not established the first multicast session The multicast session corresponding to the service. In the embodiment of this application, the first network device determines that the target access network device has not established a multicast session corresponding to the first multicast service as an example for description.
  • the network element storing the information of the established multicast session may also be referred to as the network element used to register the established multicast session.
  • S703 The first network device sends a third message.
  • the third message is used to request the target access network device to establish the first multicast session corresponding to the first multicast service.
  • the first multicast session corresponding to the first multicast service can be established on the target access network device, and the data of the first multicast service can be established by the provider of the first multicast service (for example, AF network element). ) A transmission path to the target access network device, thereby ensuring the continuity of the first multicast service, and further reducing the delay of the multicast service caused by the switching of the first terminal device across the access network device.
  • the provider of the first multicast service for example, AF network element
  • the communication method includes the following steps:
  • the first session management network element receives first indication information and first identification information.
  • the first indication information is used to instruct the first terminal device to move to the target access network device.
  • the first terminal device moves to the target access network device, it can be understood that the first terminal device has switched to or moved to the target access network device (that is, it can already send and receive data through the target access network device) Or, it can also be understood that the first terminal device is trying to access the target access network device, but has not successfully accessed, for example, in the preparation stage of the handover process, which is not specifically limited in the embodiment of the present application.
  • the first indication information may be sent by the target access network device to the first session management network element through the mobility management network element, or it may be that the mobility management network element receives information from the target access network device.
  • a message for example, a path switch request message
  • a message from a source access network device for example, a handover required message
  • the first indication information may include information of the target access network device and information used to instruct the movement (or handover) of the first terminal device.
  • the first identification information is the first identification or the identification of the first protocol data unit (protocol data unit, PDU) session
  • the first identification is used to identify the first multicast service
  • the first PDU session is the first terminal device to join the first A PDU session used in the multicast service.
  • the first identifier is sent by the target access network device to the first session management network element through the mobility management network element.
  • the identifier of the first PDU session may be sent by the target access network device to the first session management network element through the mobility management network element.
  • the identifier of the first PDU session is PDU Session Identifier (PDU Session Identifier). ID); or, it may be that the mobility management network element receives a message from the target access network device (for example, a path switching request message) or receives a message from the source access network device (for example, a handover request (handover required) Message) and then sent to the first session management network element.
  • the identifier of the first PDU session is the context identifier assigned by the first session management network element to the first PDU session (that is, the first PDU session is in the first PDU session).
  • the uniform resource identifier (URI) in the session management network element is the uniform resource identifier assigned by the first session management network element to the first PDU session (that is, the first PDU session is in the first PDU session).
  • the uniform resource identifier (URI) in the session management network element URI
  • the first session management network element sends the information of the target access network device and the first identifier to the first network device according to the first indication information.
  • the first session management network element sends the information of the target access network device and the first identifier to the first network device according to the first indication information, which can be understood as the first indication information that the first session management network element sends the first indication information to the first network device.
  • a network device sends the information of the target access network device and the trigger condition of the first identifier.
  • the first session management network element receives the first indication information and the first identification information, it can determine that the first terminal device has moved to the target access network device, and the first terminal device has joined the first multicast service, and then It is determined that the first terminal device needs to receive the data of the first multicast service through the target access network device.
  • the first session management network element Since receiving the data of the first multicast service requires a multicast session corresponding to the first multicast service, however, the first session management network The element may not have the multicast session management function. Therefore, the first session management network element sends the information of the target access network device and the first identifier to the first network device, so that the first network device can perform the multicast service corresponding to the first network device. Related processing such as the establishment of a multicast session.
  • the first session management network element may carry the information of the target access network device and the first identifier in a notification message and send it to the first network device, where the notification message is used to notify the first network device that the terminal device passes the target
  • the access network device receives the data of the first multicast service, so that the first network device performs subsequent processing, for example, establishes a multicast session corresponding to the first multicast service.
  • the first session management network element may send a request message to the first network device, where the request message carries the information of the target access network device and the first identifier, and the request message is used to request that the first network device will access the target network device.
  • the information of the multicast session established for the first multicast service corresponding to the first identifier on the network device is sent to the first session management network element, which is not limited in this embodiment.
  • the first network device can establish the first multicast service correspondence on the target access network device.
  • the first multicast session of the first multicast service is established, and the transmission path of the data of the first multicast service from the provider of the first multicast service (for example, the AF network element) to the target access network device is established, thereby ensuring the first multicast service
  • the continuity further reduces the delay of the multicast service caused by the switching of the first terminal device across the access network device.
  • the communication method includes the following steps:
  • the first session management network element receives first indication information and first identification information.
  • step S801 For related description, please refer to the above step S801, which will not be repeated here.
  • the first session management network element determines, according to the information of the target access network device and the first identification information, that the target access network device has not established a multicast session corresponding to the first multicast service.
  • step S902 is similar to the second method provided in step S702, that is, the first session management network element sends a query message to the network element that stores the information of the established multicast session to query the target connection.
  • the first session management network element sends a query message to the network element that stores the information of the established multicast session to query the target connection.
  • the first session management network element sends a fifth message to the target access network device.
  • the fifth message is used to request the target access network device to establish the first multicast session corresponding to the first multicast service.
  • the first session management network element can establish a first multicast session corresponding to the first multicast service on the target access network device, and then establish the data of the first multicast service by the provider of the first multicast service
  • the transmission path for example, AF network element
  • the target access network device thereby ensuring the continuity of the first multicast service, and further reducing the delay of the multicast service caused by the switching of the first terminal device across the access network device.
  • the foregoing method embodiment introduces the communication method provided by the present application from the side of each network element, and the communication method provided by the present application is described in detail below in the manner of interaction between network elements.
  • the communication system shown in Figure 1a or Figure 1b or Figure 1c is applied to the 5G network shown in Figure 2a or Figure 2b or Figure 2c
  • the first session management network element is an SMF network element
  • the first network device is an MCF network element
  • the second network device is an M-UPF network element as an example.
  • FIG. 10 it is a communication method provided by an embodiment of this application.
  • the communication method includes the following steps:
  • the first terminal device sends a neighboring cell measurement report to the source access network device.
  • the source access network device receives the neighbor cell measurement report from the first terminal device.
  • the neighbor cell measurement report includes signal measurement information of neighbor cells of the source cell
  • the source cell is the serving cell of the first terminal device when the first terminal device is connected to the source access network device
  • the source cell belongs to the source access network device.
  • the neighboring cell of the source cell includes the target cell belonging to the target access network device as an example for description.
  • the first terminal device when the first terminal device is connected to the source access network device, it performs signal measurement on neighboring cells of the source cell, and reports a neighboring cell measurement report to the source access network device. After the source access network device receives the neighbor cell measurement report reported by the first terminal device, it determines whether to switch the first terminal from the source cell to the neighbor cell according to the neighbor cell measurement report.
  • the source access network device determines to switch the first terminal device to the target cell, and the target cell belongs to the target access network device as an example for description.
  • the handover of the first terminal device to the target cell can also be understood as the handover of the first terminal device to the target access network device, and the two can be replaced with each other, which is not specifically limited in the embodiment of the present application.
  • the source access network device sends a handover request message to the target access network device.
  • the target access network device receives the handover request message from the source access network device.
  • the handover request message includes a first identifier, and the first identifier is used to identify the first multicast service.
  • the first identifier is used to identify the first multicast service.
  • the target access network device determines the transmission mode.
  • the transmission mode is the transmission mode of the data of the first multicast service between the target access network device and the first terminal device.
  • the transmission mode is the transmission mode of the data of the first multicast service between the target access network device and the first terminal device.
  • the source access network device may send the signal measurement information of the target cell to the target access network device, so that the target access network device can determine the transmission mode according to the signal measurement information of the target cell.
  • the target access network device may send the signal measurement information of the target cell to the target access network device, so that the target access network device can determine the transmission mode according to the signal measurement information of the target cell.
  • the source access network device may send the signal measurement information of the target cell to the target access network device through the handover request message in step S1002, and may also send the target access network device through other messages other than the handover request message.
  • the signal measurement information of the target cell is sent, which is not specifically limited in the embodiment of the present application.
  • the target access network device sends a handover response message to the source access network device.
  • the source access network device receives the handover response message from the target access network device.
  • the handover response message includes the wireless configuration information corresponding to the transmission mode of the data of the first multicast service between the target access network device and the first terminal device.
  • the wireless configuration information corresponding to the transmission mode of the data of the first multicast service between the target access network device and the first terminal device.
  • the source access network device may send the information of the QoS flow of the first multicast service to the target access network device, so that the target access network device can according to the information of the QoS flow of the first multicast service , To obtain the wireless configuration information corresponding to the transmission mode.
  • the source access network device may send the information of the QoS flow of the first multicast service to the target access network device, so that the target access network device can according to the information of the QoS flow of the first multicast service , To obtain the wireless configuration information corresponding to the transmission mode.
  • the source access network device may send the information of the QoS flow of the first multicast service to the target access network device through the handover request message in step S1002, and may also send the information about the QoS flow of the first multicast service to the target through other messages except the handover request message.
  • the access network device sends information about the QoS flow of the first multicast service, which is not specifically limited in the embodiment of the present application.
  • the source access network device sends a handover command to the first terminal device.
  • the first terminal device receives the handover command from the source access network device.
  • the handover command includes the wireless configuration information corresponding to the transmission mode of the data of the first multicast service between the target access network device and the first terminal device received by the source access network device from the target access network device, And related information about the target cell.
  • the first terminal device after receiving the handover command, attempts to access the target access network device, for example, performs a random access process with the target access network device, and after successfully accessing the target access network device, The configuration is performed according to the wireless configuration information corresponding to the transmission mode, so as to receive the data of the first multicast service through the target access network device.
  • the first terminal device sends message 1 to the target access network device.
  • the target access network device receives the message 1 from the first terminal device.
  • the message 1 is sent to the target access network device to notify the target access network device that the handover is complete.
  • the message 1 may be an existing handover notification message, such as a radio resource control (radio resource control, RRC) reconfiguration complete message, or a newly defined message, which is not limited in the embodiment of the present application.
  • RRC radio resource control
  • the target access network device sends a path switch (Path Switch) request message to the AMF network element.
  • the AMF network element receives the path switching request message from the target access network device.
  • the AMF network element is the AMF network element registered by the first terminal device.
  • the path switching request message includes information sent by the target access network device to the SMF network element, the SMF network element is the session management network element corresponding to the first PDU session, and the first PDU session is the first terminal device joining the first group PDU session used when broadcasting services.
  • the information sent by the target access network device to the SMF network element includes information 1, which includes the first identifier, the identifier of the first multicast session corresponding to the first multicast service, and the first multicast service At least one item of information about a QoS flow.
  • the identifier of the first multicast session corresponding to the first multicast service may be assigned when the target access network device establishes the first multicast session corresponding to the first multicast service, and the target access network device establishes the first multicast session.
  • the process of the first multicast session corresponding to the service will be introduced in the following step S1010, which will not be repeated here.
  • the first QoS flow of the first multicast service is part or all of the QoS flows in the QoS flow of the first multicast service. If the first QoS flow is part of the QoS flow of the first multicast service, then the first QoS flow is part of the QoS flow of the first multicast service.
  • a QoS flow may be a QoS flow that is successfully switched among the QoS flows of the first multicast service, or a QoS flow that fails to be switched.
  • the information 1 in the embodiment of the present application can also be referred to as the third information of the first multicast service, and the two can be replaced with each other, and the description is unified here, and the following embodiments will not be repeated.
  • the AMF network element sends message 2 to the SMF network element.
  • the SMF network element receives the message 2 from the AMF network element.
  • the message 2 includes the above-mentioned information 1.
  • the SMF network element may save the identifier of the first multicast session for use Modify, delete, etc. in subsequent sessions.
  • the information 1 includes the information of the successful and/or failed QoS flow of the switching of the first multicast service
  • the information of the successful and/or failed QoS flow of the switching is saved for subsequent charging and other processing
  • the QoS that failed the switching may be deleted from the context of the first terminal device to avoid subsequent charging in conjunction with the failed QoS flow.
  • the target access network device may search for the first identifier in the multicast context stored by the target access network device, and if the multicast context stored by the target access network device includes the first identifier The identified multicast context, it is considered that the target access network device has created the context of the first multicast service; if the multicast context stored by the target access network device does not include the multicast context with the first identifier, it is considered that the target The access network device does not create (or does not exist) the context of the first multicast service. Accordingly, it can also be considered that the target access network device has not established a multicast session corresponding to the first multicast service, or the target access network device There is no multicast session corresponding to the first multicast service.
  • the communication method provided in the embodiment of the present application further includes the following steps:
  • the target access network device sends a first message to the MCF network element.
  • the MCF network element receives the first message from the target access network device.
  • the first message includes a first identifier, the first identifier is used to identify the first multicast service, and the first message is used by the target access network device to request the establishment of a first multicast session corresponding to the first multicast service.
  • the first message may also include information of the target access network device, so that the MCF network element can determine whether the first multicast service corresponding to the first multicast service can be established for the target access network device according to the information of the target access network device. Multicast session.
  • the first message may not include the information of the target access network device.
  • the target access network device sends the first message to the MCF network element through the AMF network element, and the AMF network element sends the first message to the MCF network element.
  • the information of the target access network device is sent to the MCF network element.
  • the first message may further include information 2, and the information 2 includes: at least one of the identifier of the first multicast session and the first path information.
  • the identifier of the first multicast session may be allocated by the target access network device, and the first path information includes the internet protocol (IP) address of the target access network device and the first tunnel identifier.
  • IP internet protocol
  • the first tunnel identifier is used for To identify the unicast tunnel through which the target access network device receives the data of the first multicast service.
  • the first message may also include the information of the first QoS flow of the first multicast service.
  • the information of the first QoS flow of the first multicast service refer to the above step S1007, which will not be repeated here.
  • the information 2 in the embodiment of the present application can also be referred to as the first information of the first multicast service, and the two can be replaced with each other, and the description is unified here, and the following embodiments will not be repeated.
  • the MCF network element establishes a first multicast session corresponding to the first multicast service.
  • the MCF After the MCF receives the first message from the target access network device, it determines whether the target access network device is located within the service range of the first multicast service. When the target access network device is located within the service range of the first multicast service During internal time, the first network device establishes a first multicast session corresponding to the first multicast service.
  • the MCF network element may obtain the policy information of the first multicast service from the PCF network element (or UDR network element), and the policy information may include the service range of the first multicast service.
  • the MCF network element determines according to the information of the target access network device Whether the target access network device is located within the service range of the first multicast service.
  • the information of the target access network device can reflect the service range of the target access network device, and the MCF network element can compare the service range of the target access network device with the service range of the first multicast service, and when both exist When the intersection or the service range of the first multicast service includes the service range of the target access network device, it is determined that the target access network device is located within the service range of the first multicast service.
  • the policy information of the first multicast service may also be referred to as the configuration information of the first multicast service, and the two may be replaced with each other, which is not specifically limited in the embodiment of the present application.
  • the MCF network element may save the identifier of the first multicast session for use in the subsequent first multicast session. Modify, delete, etc.
  • the MCF network element performs step S1011 to establish a tunnel between the M-UPF network element and the target access network device for data transmission of the first multicast service.
  • the MCF network element further executes step S1012.
  • the MCF network element sends the first path information to the M-UPF network element.
  • the M-UPF network element receives the first path information from the MCF network element.
  • the M-UPF network element saves the first path information, and subsequently, when receiving the data of the first multicast service from the MUF, accesses the target according to the first path information
  • the network device sends the data of the first multicast service.
  • the MCF network element sends third path information to the MUF network element.
  • the MUF network element receives the third path information from the MCF network element.
  • the third path information includes the IP address of the M-UPF network element and the third tunnel identifier, and the third tunnel identifier is used to identify the tunnel through which the M-UPF network element receives the data of the first multicast service.
  • the MUF network element saves the third path information, and subsequently, when receiving the data of the first multicast service from the AF network element, sends the information to the MUF network element according to the third path information. Send the data of the first multicast service.
  • the data of the first multicast service can be sent from the AF network element to the target access network device through the MUF network element and the M-UPF network element, and then sent from the target access network device to the first terminal device.
  • the MCF network element sends a response message to the target access network device.
  • the target access network device receives the response message from the MCF network element.
  • the response message includes information 3.
  • the information 3 includes at least one of the identification of the first multicast session and the second path information.
  • the identifier of the first multicast session may be assigned by the MCF network element, and the second path information includes the multicast address and the second tunnel identifier, and the multicast address is used by the target access network device to receive the first group through multicast.
  • the second tunnel identifier is used to identify the multicast tunnel through which the target access network device receives the data of the first multicast service in a multicast manner.
  • the multicast address may be an IP multicast address or other forms of multicast addresses, which is not specifically limited in the embodiment of the present application.
  • the target access network device receives the information 3, if the information 3 includes the second path information, the second path information is saved, so as to subsequently receive the data of the first multicast service according to the second path information.
  • the MCF network element also sends the second path information to the M-UPF network element, so that the M-UPF network element sends the data of the first multicast service to the target access network device according to the second path information.
  • the target access network device when the aforementioned second path information includes an IP multicast address, the target access network device also sends an IP multicast protocol (IP Group Management Protocol, IGMP) join (Jion) request to join the IP multicast group, and then Transmit the data of the first multicast service.
  • IP Group Management Protocol IP Group Management Protocol
  • IGMP IP Group Management Protocol
  • the M-UPF network element may also send an IGMP join request.
  • the information 3 in the embodiment of the present application can also be referred to as the second information of the first multicast service, and the two can be replaced with each other, and the description is unified here, and the following embodiments will not be repeated.
  • Steps S1003-S1008 can be executed first, and then steps S1009-S1013; or steps S1009-S1009- S1013, then execute steps S1003-S1008; it is also possible to execute steps S1003-S1008 and steps S1009-S1013 at the same time, which is not specifically limited in the embodiment of the present application.
  • the wireless configuration information used in the transmission of the multicast service can be sent to the first terminal device, so that the first terminal device can configure , Thereby reducing the delay of the multicast service caused by the handover of the first terminal device across the access network device; on the other hand, the first multicast session corresponding to the first multicast service can be established on the target access network device, and then Establish a transmission path for the data of the first multicast service from the provider of the first multicast service (for example, AF network element) to the target access network device, so as to ensure the continuity of the first multicast service and further reduce the transmission path of the first multicast service.
  • the information sent by the target access network device to the AMF network element further includes first indication information, and the first indication information is used to indicate the first indication information.
  • the terminal device moves to the target access network device, and then in S1008, the message 2 sent by the AMF network element to the SMF network element also includes the first indication information; or, in the above step S1007, the AMF network element receives the message from the target access network element.
  • the message 2 sent by the AMF network element to the SMF network element includes the first indication information; or, the AMF network element receives a message from the source access network device (switching After a request (handover required message), the first indication information is sent to the SMF network element.
  • the SMF network element executes the following steps S1014-S1016:
  • the SMF network element sends a second message to the MCF network element.
  • the MCF network element receives the second message from the SMF network element.
  • the SMF network element after the SMF network element receives the first indication information, it triggers the action of sending a second message to the MCF network element.
  • the second message is used to request the MCF network element to allow the first terminal device to receive the first group through the target access network device. Broadcast business data.
  • the second message may include one or more of the identification of the first terminal device, the first identification, and the information of the target access network device.
  • the MCF network element determines to allow the first terminal device to receive the data of the first multicast service through the target access network device.
  • the policy information of the first multicast service acquired by the MCF network element may further include the identification of the terminal device that is allowed to receive the data of the first multicast service, and the first multicast service is allowed to receive the first multicast service.
  • the terminal equipment of the multicast service data has nothing to do with the access network equipment, that is, no matter which access network equipment the terminal equipment is connected to, the terminal equipment is allowed to receive the data of the first multicast service through the access network equipment it accesses. .
  • the MCF network element determines that the first terminal device is allowed to pass through The target access network device receives the data of the first multicast service.
  • the policy information of the first multicast service acquired by the MCF network element may also include the information of the target access network device corresponding to the data allowed to receive the first multicast service.
  • the identification of the terminal device, the information of the target access network device corresponds to the terminal device that is allowed to receive the data of the first multicast service, and only when it accesses the target access network device, is it allowed to receive the first multicast service through the target access network device.
  • the data of a multicast service for example, the information of the target access network device is TAI, and the identifier of the terminal device that is allowed to receive the data of the first multicast service corresponding to the TAI indicates that it is allowed to receive the first group within the range of the TAI
  • the identification of the terminal device that broadcasts the data of the service.
  • the second message includes the identification of the first terminal device and the information of the target access network device, when the information of the target access network device corresponds to the identification of the terminal device that is allowed to receive the data of the first multicast service, it includes the first
  • the MCF network element determines that the first terminal device is allowed to receive the data of the first multicast service through the target access network device.
  • the MCF network element sends second indication information to the SMF network element.
  • the SMF network element receives the second indication information from the MCF network element.
  • the second indication information is used to indicate that the first terminal device is allowed to receive the data of the first multicast service through the target access network device.
  • the SMF network element may continue to perform subsequent processing.
  • the SMF network element when the SMF network element receives the indication information that the first terminal device is not allowed to receive the data of the first multicast service through the target access network device, the SMF network element notifies the target access network device to stop sending to the first terminal device The data of the first multicast service is deleted, and the first terminal device is deleted from the first multicast session corresponding to the first multicast service created by the target access network device.
  • the target access network device continues to send the data of the first multicast service to the first terminal device. This can prevent a situation in which the first terminal device still sends the data of the first multicast service to the first terminal device when it is not allowed to receive the first multicast service.
  • the communication method provided in the embodiment of the present application further includes:
  • the MCF network element sends the identifier of the first multicast session corresponding to the first multicast service to the SMF network element.
  • the SMF network element receives the identifier of the first multicast session corresponding to the first multicast service from the MCF network element.
  • the identifier of the first multicast session corresponding to the first multicast service sent by the MCF network element to the SMF network element in step S1213a may be the first identifier and the identifier of the first multicast session.
  • the SMF network element sends a message 3 to the target access network device through the signaling connection related to the first terminal device.
  • the target access network device receives the message 3 from the SMF network element through the signaling connection.
  • the message 3 includes the identifier of the first multicast session corresponding to the first multicast service, and the message 3 is used to request the target access network device to associate the first terminal device with the first multicast session.
  • the target access network device associates the first multicast session with the first terminal device, for example, the identifier of the first terminal device Save to the context of the first multicast session so that you can subsequently obtain the identity of the first terminal device through the context of the first multicast session, and reconfigure the first multicast service for the first terminal device according to the context of the first terminal device Air interface transmission mode or wireless configuration information corresponding to this transmission mode.
  • the SMF network element may, after receiving the second instruction information indicating that the MCF network element allows the first terminal device to receive the data of the first multicast service through the target access network device, through the information related to the first terminal device Make the connection send message 3 to the target access network device.
  • steps S1009-S1013 and steps S1014-S1016 there is no strict execution sequence between steps S1009-S1013 and steps S1014-S1016.
  • Steps S1009-S1013 can be executed first, and then steps S1014-S1016; or step S1014-S1016 can be executed first.
  • S1016 then execute steps S1009-S1013; it is also possible to execute steps S1009-S1013 and steps S1014-S1016 at the same time, which is not specifically limited in the embodiment of the present application.
  • each network element in the foregoing steps can be executed by the processor 301 in the communication device 300 shown in FIG. 3 calling the application program code stored in the memory 303, which is not limited in this embodiment.
  • the first session management network element is the SMF network element
  • the first network device is the first M -SMF network element
  • the second network device is the M-UPF network element
  • the third network device is the first M-AMF network element as an example.
  • FIG. 11 it is a communication method provided by this embodiment of the application. The communication method includes the following steps:
  • S1101-S1108 are similar to steps S1001-S1008 in the embodiment shown in FIG. 10, and related descriptions can refer to the embodiment shown in FIG. 10, which will not be repeated here.
  • the source access network device may also include the identifier of the M-AMF network element corresponding to the second multicast session in the handover request message sent to the target access network device, and the second multicast session is The multicast session corresponding to the first multicast service established by the source access network device.
  • the communication method provided in the embodiment of the present application further includes the following steps:
  • S1109a The target access network device sends a message 3 to the first M-AMF network element.
  • the first M-AMF network element receives the message 3 from the target access network device.
  • the target access network may first select the first M-AMF network element, and then send the message 3 to the first M-AMF network element.
  • the target access network device may select the first M-AMF network element according to the following manner:
  • Method 1 If the source access network device sends the identifier of the M-AMF network element corresponding to the second multicast session to the target access network device, the first M-AMF network element may be the one corresponding to the second multicast session M-AMF network element.
  • the target access network device selects the first M-AMF network element according to the information of the target access network device.
  • the target access network device may select an M-AMF network element whose service range includes the service range corresponding to the information of the target access network device as the first M-AMF network element.
  • the target access network device selects the first M-AMF network element according to the first identifier.
  • the target access network device may select an M-AMF network element that supports the first multicast service identified by the first identifier as the first M-AMF network element.
  • the target access network device can select the AMF network element registered by the first terminal device as the first M-AMF network element.
  • the AMF network element registered by the first terminal device and the M-AMF network element are co-located, and the AMF network element and the first M-AMF network element in FIG. 11 can be merged.
  • the target access network device can select the first M-AMF network element according to any of the above four methods, or it can select the first M-AMF network element in combination with any of the above four methods.
  • the target access network device can select the first M-AMF network element in combination with the second and third methods.
  • the target access network device may send a message 3 to the first M-AMF network element through a device-level N2 message (that is, the N2 message does not include the next generation application protocol (NGAP) identifier)
  • the target access network device may also create an N2 signaling connection with the first M-AMF network element for the first multicast service, so as to subsequently transmit the N2 signaling related to the first multicast service.
  • NGAP next generation application protocol
  • the target access network device when it sends message 3 to the first M-AMF network element, it may send the NGAP identifier allocated by the target access network device for the first multicast service to the first M-AMF network element, and correspondingly, In the response message of message 3, the first M-AMF network element sends the NAGP identifier allocated by the first M-AMF network element for the first multicast service to the target access network device. So far, the target access network device and the first multicast service The N2 signaling connection between the M-AMF network elements is successfully established. When the message related to the first multicast service is subsequently sent, the first M-AMF network element and the target access network device use the above-mentioned NGAP identifier to identify the first multicast service.
  • a multicast service that is, the message includes the NGAP identifier assigned by the target access network device and the NGAP identifier assigned by the first M-AMF network element; or, if the target access network device selects the first M-AMF network element according to the above method four -AMF, then optionally, the target access network device may also use the signaling connection of the first terminal device to send message 3 to the first M-AMF network element.
  • the message 3 includes a first message sent by the target access network device to the first M-SMF network element, the first message includes a first identifier, the first identifier is used to identify the first multicast service, and the first message It is used by the target access network device to request the establishment of the first multicast session corresponding to the first multicast service.
  • the first message may also include other information, for example, information about the target access network device, information 2, information about the first QoS flow of the first multicast service, etc.
  • information about the target access network device information 2
  • information about the first QoS flow of the first multicast service etc.
  • the first message may not include the information of the target access network device.
  • the target The information of the access network device is sent to the first M-SMF network element.
  • the message 3 may also include information sent by the target access network device to the first M-AMF network element.
  • the information sent by the target access network device to the first M-AMF network element may include one or more of the following: the first identifier, the identifier of the first multicast session corresponding to the first multicast service, the first The ID of the PDU session.
  • the first PDU session is a PDU session used when the first terminal device joins the first multicast service.
  • the message 3 may also be used to request the first M-AMF network element to create a context corresponding to the first multicast service, so that the first M-AMF network element creates a context corresponding to the first multicast service.
  • the first M-AMF network element sends a first message to the first M-SMF network element.
  • the first M-SMF network element receives the first message from the first M-AMF network element.
  • the first M-AMF network element may first select the first M-SMF network element, and then send the first message to the first M-SMF network element.
  • the first M-AMF network element may select the first M-SMF network element in the following manner:
  • the first M-AMF network element selects the first M-SMF network element according to the information of the target access network device.
  • the target access network device may select an M-SMF network element whose service range includes the service range corresponding to the information of the target access network device as the first M-SMF network element.
  • the first M-AMF selects the first M-SMF network element according to the first identifier.
  • the target access network device may select an M-SMF network element that supports the first multicast service identified by the first identifier as the first M-SMF network element.
  • Method 3 If the first M-AMF network element is the M-AMF network element corresponding to the second multicast session, the first M-AMF network element selects the M-SMF network element serving the multicast session of the source access network device , As the first M-SMF network element.
  • Method 4 If the first M-AMF network element is an AMF network element registered by the first terminal device, and the information sent by the target access network device to the first M-AMF network element includes the identifier of the first PDU session, the first M-AMF network element -The AMF network element selects the SMF network element corresponding to the first PDU session as the first M-SMF network element.
  • the AMF network element and the first M-AMF network element are co-located, and the SMF network element and the M-SMF network element are co-located.
  • the AMF network element and the first M-AMF network element are co-located.
  • the network elements can be combined, and the SMF network element and the first M-SMF network element can be combined. The following steps S1114 and S1116 are not executed.
  • the first M-AMF network element can select the first M-SMF network element according to any of the above four methods, or it can select the first M-SMF network element in combination with any of the above four methods.
  • the SMF network element for example, the first M-AMF network element can select the first M-SMF network element in combination with the second method and the third method.
  • the first M-SMF network element establishes a first multicast session corresponding to the first multicast service.
  • this step S1110 is similar to the above step S1010, except that the execution subject in this step S1110 is the first M-SM F network element, and the execution subject in step S1010 is the MCF network element.
  • the first M-SMF network element performs step S1111 to establish an M-UPF network element for data transmission of the first multicast service The tunnel with the target access network device.
  • the communication method provided in the embodiment of the present application further includes steps S1112a-S1112b.
  • the first M-SMF network element sends the first path information to the M-UPF network element.
  • the M-UPF network element receives the first path information from the first M-SMF network element.
  • this step S1111 is similar to the above step S1011, and the related description can refer to the above step S1011, which will not be repeated here.
  • the first M-SMF network element sends third path information to the MCF network element.
  • the MCF network element receives the third path information from the first M-SMF network element.
  • the MCF network element executes step S1112b.
  • the MCF network element sends the third path information to the MUF network element.
  • the MUF network element receives the third path information from the MCF network element.
  • the MUF network element saves the third path information, and subsequently, when receiving the data of the first multicast service from the AF network element, sends the information to the MUF network element according to the third path information. Send the data of the first multicast service.
  • the data of the first multicast service can be sent from the AF network element to the target access network device through the MUF network element and the M-UPF network element, and then sent from the target access network device to the first terminal device.
  • the MCF network element sends a response message 1 to the first M-SMF network element.
  • the first M-SMF network element receives the response message 1 from the MCF network element.
  • the first M-SMF network element sends a response message 2 to the first M-AMF network element.
  • the first M-AMF network element receives the response message 2 from the first M-SMF network element.
  • the response message 2 includes information sent by the first M-SMF network element to the target access network device.
  • the information sent by the first M-SMF network element to the target access network device includes information 3, which includes the identifier of the first multicast session and the information in the second path information.
  • the first M-SMF network element also sends the second path information to the M-UPF network element through the MCF network element.
  • step S1013 which will not be repeated here.
  • the first M-AMF network element sends a response message 3 to the target access network device.
  • the target access network device receives the response message 3 from the first M-AMF network element.
  • the response message 3 includes information sent by the first M-SMF network element to the target access network device, for example, information 3.
  • step S1013 for the processing after the target access network device receives the information 3, reference may be made to the related description in step S1013 above, and details are not described herein again.
  • steps S1103-S1108 and steps S1109a-S1113c there is no strict execution sequence between steps S1103-S1108 and steps S1109a-S1113c. Steps S1103-S1108 can be performed first, and then steps S1109a-S1113c; steps S1109a-S1109a- can also be performed first. S1113c, then execute steps S1103-S1108; it is also possible to execute steps S1103-S1108 and steps S1109a-S1113c at the same time, which is not specifically limited in the embodiment of the present application.
  • the wireless configuration information used in the transmission of the multicast service can be sent to the first terminal device, so that the first terminal device can configure , Thereby reducing the delay of the multicast service caused by the handover of the first terminal device across the access network device; on the other hand, the first multicast session corresponding to the first multicast service can be established on the target access network device, and then Establish a transmission path for the data of the first multicast service from the provider of the first multicast service (for example, an AF network element) to the target access network device, thereby ensuring the continuity of the first multicast service, and further reducing the transmission path of the first multicast service.
  • the information sent by the target access network device to the AMF network element further includes first indication information, and the first indication information is used to indicate the first indication information.
  • the terminal device moves to the target access network device, and then in S1108, the message 2 sent by the AMF network element to the SMF network element also includes the first indication information; or, in the above step S1107, the AMF network element receives the message from the target access network element.
  • the message 2 sent by the AMF network element to the SMF network element includes the first indication information; or, the AMF network element receives a message from the source access network device (switching After the request (handover required) message, the first indication information is sent to the SMF network element.
  • the communication method shown in FIG. 11 further includes steps S1114-S1116. Wherein, steps S1114-S1116 are similar to steps S1014-S1016 in the embodiment shown in FIG. 10, and related descriptions can refer to the embodiment shown in FIG. 10, which will not be repeated here.
  • steps S1109a-S1113c and steps S1114-S1116 there is no strict execution sequence between steps S1109a-S1113c and steps S1114-S1116. Steps S1109a-S1113c can be performed first, and then steps S1114-S1116; or steps S1114-S1116 can be performed first. S1116, then execute steps S1109a-S1113c; it is also possible to execute steps S1109a-S1113c and steps S1114-S1116 at the same time, which is not specifically limited in the embodiment of the present application.
  • each network element in the foregoing steps can be executed by the processor 301 in the communication device 300 shown in FIG. 3 calling the application program code stored in the memory 303, which is not limited in this embodiment.
  • the communication system shown in Figure 1a or Figure 1b or Figure 1c is applied to the 5G network shown in Figure 2a or Figure 2b or Figure 2c
  • the first session management network element is an SMF network element
  • the first network device is an MCF network element
  • the second network device is an M-UPF network element as an example.
  • FIG. 12 it is a communication method provided by an embodiment of this application. The communication method includes the following steps:
  • S1201-S1208 are the same as steps S1001-S1008 in the embodiment shown in FIG. 10, and related descriptions can refer to the embodiment shown in FIG. 10, which will not be repeated here.
  • the information sent by the target access network device to the SMF network element further includes the first indication information and the first identifier Information
  • the first indication information is used to instruct the first terminal device to move to the target access network device
  • the first identification information is the first identification or the identification of the first PDU session.
  • the identification of the first PDU session is PDU Session ID (PDU Session ID)
  • the message 2 sent by the AMF network element to the SMF network element also includes the first indication information and the first identification information;
  • step S1207 after the AMF network element receives the path switching request message from the target access network device, in step S1208, the message 2 sent by the AMF network element to the SMF network element includes the The first indication information and the first identification information, where the first identification information is the identifier of the first PDU session.
  • the identifier of the first PDU session is the context identifier assigned by the SMF network element for the first PDU session (that is, the The URI of the first PDU session in the SMF network element);
  • the first indication information and the first identification information are sent to the SMF network element, where:
  • the first identification information is the identification of the first PDU session.
  • the identification of the first PDU session is also the context identification assigned by the SMF network element for the first PDU session (that is, the identification of the first PDU session in the SMF network element).
  • URI the context identification assigned by the SMF network element for the first PDU session
  • the SMF network element after receiving the first indication information and the first identification information, performs the following steps S1209-S1214:
  • the SMF network element sends message 3 to the MCF network element according to the first indication information.
  • the MCF network element receives the message 3 from the SMF network element.
  • the message 3 includes the information of the target access network device and the first identifier.
  • the message 3 may be used to notify the presence of the terminal device to receive the data of the first multicast service through the target access network device, so that the MCF network element performs subsequent processing, for example, continue to perform the following step S1210.
  • the message 3 is used to request information about the first multicast session created by the target access network device for the first multicast service from the MCF network element, if the target access network device creates the information for the first multicast service If the first multicast session is completed, the MCF network element returns the information of the first multicast session to the SMF network element; otherwise, it continues to perform the following step S1210.
  • the communication method provided in the embodiment of the present application further includes: the SMF network element corresponds to the first PDU session according to the identification of the first PDU session Get the first ID in the context of the.
  • the MCF network element determines that the target access network device has not established a multicast session corresponding to the first multicast service.
  • the MCF network element determines that the target access network device has not established a multicast session corresponding to the first multicast service according to the information of the target access network device and the first identifier.
  • the target access network device has not established a multicast session corresponding to the first multicast service according to the information of the target access network device and the first identifier.
  • the related step S702 please refer to the related step S702. The description will not be repeated here.
  • the MCF network element determines whether the target access network device is within the service range of the first multicast service.
  • the following step S1211 is executed.
  • the implementation manner for the MCF network element to determine whether the target access network device is within the service range of the first multicast service may refer to the related description in the foregoing step S1010, which will not be repeated here.
  • the MCF network element sends a third message to the target access network device.
  • the target access network device receives the third message from the MCF network element.
  • the third message is used to request the target access network device to establish the first multicast session corresponding to the first multicast service.
  • the third message includes the first identifier.
  • the third message may include at least one of the identifier of the first multicast session and the second path information.
  • the MCF network element may send the third message to the target access network device through the AMF network element registered by the first terminal device.
  • the SMF network element may send the identification information of the AMF network element registered by the first terminal device to the MCF network element, so that the MCF network element can send the third message to the AMF network element; or the MCF network element may The AMF network element registered through the SMF network element and the first terminal device sends the third message to the target access network device; or, the MCF network element can select an AMF network element to send the first message to the target access network device through the AMF network element
  • Three messages for example, the MCF network element can select the AMF network element according to the information of the target access network device, and send the third message to the target access network device through the AMF network element, which is not specifically limited in the embodiment of the present application.
  • the target access network device sends a response message to the MCF network element.
  • the MCF network element receives the response message from the target access network device.
  • the response message includes the identifier of the first multicast session and the information in the first path information. At least one item; or, if the target access network device does not support receiving data in a multicast manner, the response message may also include first path information.
  • the MCF network element executes step S1213 to establish a tunnel between the M-UPF network element and the target access network device for data transmission of the first multicast service.
  • the MCF network element further executes step S1214.
  • the MCF network element sends the first path information to the M-UPF network element.
  • the M-UPF network element receives the first path information from the MCF network element.
  • the MCF network element sends third path information to the MUF network element.
  • the MUF network element receives the third path information from the MCF network element.
  • steps S1213-S1214 can refer to the above-mentioned steps S1011-S1012, which will not be repeated here.
  • Steps S1203-S1208 can be performed first, and then steps S1209-S1214; or step S1209-S1209- S1214, then execute steps S1203-S1208; it is also possible to execute steps S1203-S1208 and steps S1209-S1214 at the same time, which will not be repeated here.
  • the wireless configuration information used in the transmission of the multicast service can be sent to the first terminal device, so that the first terminal device can configure , Thereby reducing the delay of the multicast service caused by the handover of the first terminal device across the access network device; on the other hand, the first multicast session corresponding to the first multicast service can be established on the target access network device, and then Establish a transmission path for the data of the first multicast service from the provider of the first multicast service (for example, AF network element) to the target access network device, so as to ensure the continuity of the first multicast service and further reduce the transmission path of the first multicast service.
  • the communication method provided in the embodiment of the present application further includes:
  • the MCF network element sends the identifier of the first multicast session corresponding to the first multicast service to the SMF network element.
  • the SMF network element receives the identifier of the first multicast session corresponding to the first multicast service from the MCF network element.
  • the identifier of the first multicast session corresponding to the first multicast service sent by the MCF network element to the SMF network element in step S1212a may be the first identifier and the identifier of the first multicast session.
  • the SMF network element sends a message 4 to the target access network device through the signaling connection related to the first terminal device.
  • the target access network device receives the message 4 from the SMF network element through the signaling connection.
  • the message 4 includes the identifier of the first multicast session corresponding to the first multicast service, and the message 4 is used to request the target access network device to associate the first terminal device with the first multicast session.
  • the target access network device associates the first multicast session with the first terminal device, for example, the identifier of the first terminal device Save to the context of the first multicast session so that you can subsequently obtain the identity of the first terminal device through the context of the first multicast session, and reconfigure the first multicast service for the first terminal device according to the context of the first terminal device Air interface transmission mode or wireless configuration information corresponding to this transmission mode.
  • the message 3 sent by the SMF network element to the MCF network element may further include a fourth message.
  • the fourth message is used to request the first network device to allow the first terminal device to receive the data of the first multicast service through the target access network device.
  • the fourth message may include one or more of the identification of the first terminal device, the first identification, and the information of the target access network device.
  • the MCF network element executes the following steps S1215-S1216:
  • the MCF network element determines to allow the first terminal device to receive the data of the first multicast service through the target access network device.
  • the MCF network element may determine to allow the first terminal device to receive the data of the first multicast service through the target access network device according to the policy information of the first multicast service.
  • the MCF network element may determine to allow the first terminal device to receive the data of the first multicast service through the target access network device according to the policy information of the first multicast service.
  • the MCF network element sends third indication information to the SMF network element.
  • the SMF network element receives the third indication information from the MCF network element.
  • the third indication information is used to indicate that the first terminal device is allowed to receive the data of the first multicast service through the target access network device.
  • the SMF network element may continue to perform subsequent processing.
  • the MCF network element may include the third indication information and the identifier of the first multicast session corresponding to the first multicast service in step S1212a in one message and send it to the SMF network element, or they may send it to the SMF network element through two messages respectively.
  • the third instruction information and the identifier of the first multicast session corresponding to the first multicast service are sent, which is not specifically limited in the embodiment of the present application.
  • the SMF network element when the SMF network element receives the indication information that the first terminal device is not allowed to receive the data of the first multicast service through the target access network device, the SMF network element notifies the target access network device to stop sending to the first terminal device The data of the first multicast service is deleted, and the first terminal device is deleted from the first multicast session corresponding to the first multicast service created by the target access network device.
  • the target access network device continues to send the data of the first multicast service to the first terminal device. This can prevent a situation in which the first terminal device still sends the data of the first multicast service to the first terminal device when it is not allowed to receive the first multicast service.
  • step S1209 the communication method provided in the embodiment of the present application further includes the following step S1217:
  • the SMF network element determines to allow the first terminal device to receive the data of the first multicast service through the target access network device.
  • the SMF network element may obtain the policy information of the first terminal device, and the policy information of the first terminal device may include the information of the area where the first terminal device receives the data of the first multicast service.
  • the SMF network element determines to allow the first terminal device to receive the data of the first multicast service through the target access network device.
  • the above-mentioned policy information of the first terminal device may also be referred to as the contract information of the first terminal device, and the two may be replaced with each other, which is not specifically limited in the embodiment of the present application.
  • the target access network device is located in the area indicated by the above area information, it can be understood that the area indicated by the area information includes the service range of the target access network device, or the area indicated by the area information and the target access network The service scope of the equipment overlaps.
  • the SMF network element may also obtain the policy information of the first multicast service, so as to determine, according to the policy information of the first multicast service, that the first terminal device is allowed to receive the first multicast service through the target access network device.
  • the relevant description can refer to the above step S1015, which will not be repeated here.
  • the SMF network element may not trigger the execution of the steps after S1209 including step S1209. At this time, the SMF network element notifies the target access device to stop sending the data of the first multicast service to the first terminal device, and deletes the first terminal device from the context of the first multicast session.
  • each network element in the foregoing steps can be executed by the processor 301 in the communication device 300 shown in FIG. 3 calling the application program code stored in the memory 303, which is not limited in this embodiment.
  • the communication system shown in Figure 1a or Figure 1b or Figure 1c is applied to the 5G network shown in Figure 2a or Figure 2b or Figure 2c
  • the first session management network element is an SMF network element
  • the second network device is an M-UPF Taking a network element as an example, as shown in FIG. 13, it is a communication method provided by an embodiment of this application.
  • the communication method includes the following steps:
  • S1301-S1308 are the same as steps S1001-S1008 in the embodiment shown in FIG. 10, and related descriptions can refer to the embodiment shown in FIG. 10, which will not be repeated here.
  • the target access network device or the AMF network element may send the first indication information and the first identification information to the SMF network element.
  • the target access network device or the AMF network element may send the first indication information and the first identification information to the SMF network element.
  • the SMF network element may determine that the first terminal device is handed over, and the first terminal device has joined the first multicast service, so that the following steps may be performed:
  • the SMF network element determines that the target access network device has not established a multicast session corresponding to the first multicast service.
  • the SMF network element determines that the target access network device has not established a multicast session corresponding to the first multicast service according to the information of the target access network device and the first identification information.
  • the SMF network element determines, according to the information of the target access network device and the first identification, that the target access network device has not established a multicast session corresponding to the first multicast service;
  • the SMF network element obtains the first identification from the context corresponding to the first PDU session, and then determines the target access network according to the information of the target access network device and the first identification The device has not established a multicast session corresponding to the first multicast service.
  • the SMF network element may interact with the fourth network device to determine that the target access network device has not established a multicast session corresponding to the first multicast service according to the information of the target access network device and the first identifier .
  • the fourth network device may be a network element that stores information about an established multicast session.
  • the information of the established multicast session stored in the fourth network device may include the identifier of the multicast session, the information of the access network device corresponding to the multicast session, the identifier of the multicast service corresponding to the multicast session, and the identifier of the multicast service corresponding to the multicast session.
  • the identifier of the SMF network element of this multicast session may include the identifier of the SMF network element of this multicast session.
  • the fourth network device may be, for example, a UDM network element in a 5G network, or a PCF network element, or a UDR network element.
  • the fourth network device is an UDM network element for illustration.
  • the SMF network element interacts with the UDM network element and determines that the target access network device has not established the first multicast service correspondence according to the information and the first identifier of the target access network device.
  • the multicast session may include the following steps S1309a-S1309b:
  • the SMF network element sends a sixth message to the UDM network element.
  • the UDM network element receives the sixth message from the SMF network element.
  • the sixth message is used to query the multicast session corresponding to the first multicast service established by the target access network device, and the sixth message includes the information of the target access network device and the first identifier.
  • the UDM network element queries its stored information about established multicast sessions. If there is a multicast session, it also corresponds to the identification information of the target access network device and the first identification, that is, the group
  • the access network device information corresponding to the broadcast session includes the information of the target access network device, and the identifier of the multicast service corresponding to the multicast session includes the first identifier
  • the UDM network element returns the information of the multicast session to the SMF network.
  • the UDM network element sends a response message to the SMF network element to indicate that there is a multicast session corresponding to the first multicast service established by the target access network device; otherwise, step S1309b is executed.
  • the UDM network element sends fourth indication information to the SMF network element.
  • the UDM network element receives the fourth indication information from the SMF network element.
  • the fourth indication information is used to indicate that the target access network device has not established a multicast session corresponding to the first multicast service.
  • the SMF network element can determine that the target access network device has not established a multicast session corresponding to the first multicast service.
  • the SMF network element executes the following step S1310 to initiate a multicast session establishment process.
  • the SMF network element sends a fifth message to the target access network device through the AMF network element.
  • the target access network device receives the fifth message from the SMF network element through the AMF network element.
  • the SMF network element can determine whether the target access network device is within the service range of the first multicast service. When the target access network device is within the service range of the first multicast service, the AMF network element sends the target The access network device sends the fifth message.
  • the implementation manner for the SMF network element to determine whether the target access network device is located within the service range of the first multicast service may refer to the relevant description specified in the above step S1010, which will not be repeated here.
  • the fifth message is used to request the target access network device to establish the first multicast session corresponding to the first multicast service.
  • the fifth message includes the first identifier.
  • the fifth message may also include at least one of the identifier of the first multicast session corresponding to the first multicast service and the second path information, and the identifier of the first multicast session is allocated by the SMF network element.
  • the identifier of the first multicast session is allocated by the SMF network element.
  • the target access network device sends a response message to the SMF network element through the AMF network element.
  • the SMF network element receives the response message from the target access network device through the AMF network element.
  • the response message is the response of the target access network device to the fifth message.
  • the response message may include at least one of the identifier of the first multicast session and the first path information.
  • the identifier of the first multicast session included in the response message is allocated by the target access network device; or, if the target access network device does not support receiving data in a multicast manner, the response message may also include the first multicast session One path information.
  • the SMF network element executes step S1312 to establish a tunnel between the M-UPF network element and the target access network device for data transmission of the first multicast service.
  • the communication method provided in the embodiment of the present application further includes steps S1313a-S1313b.
  • the SMF network element can also perform step S1314 to save the information of the first multicast session corresponding to the established first multicast service in the UDM network element, or in other words, to save the first multicast session information to the UDM network element.
  • the information of the multicast session is registered to the UDM network element.
  • the SMF network element sends the first path information to the M-UPF network element.
  • the M-UPF network element receives the first path information from the SMF network element.
  • step S1011 For the related description, please refer to the above step S1011, which will not be repeated here.
  • the SMF network element sends the third path information to the MCF network element.
  • the MCF network element receives the third path information from the SMF network element.
  • step S1012 For the related description of the third path information, please refer to the above step S1012, which will not be repeated here.
  • the MCF network element executes step S1314b.
  • the MCF network element sends the third path information to the MUF network element.
  • the MUF network element receives the third path information from the MCF network element.
  • the SMF network element sends a seventh message to the UDM network element.
  • the UDM network element receives the seventh message from the SMF network element.
  • the seventh message is used to register the first multicast session to the UDM network element, and the seventh message includes the information of the target access network device, the first identifier, and the identifier of the first multicast session.
  • the wireless configuration information used in the transmission of the multicast service can be sent to the first terminal device, so that the first terminal device can configure , Thereby reducing the delay of the multicast service caused by the handover of the first terminal device across the access network device; on the other hand, the first multicast session corresponding to the first multicast service can be established on the target access network device, and then Establish a transmission path for the data of the first multicast service from the provider of the first multicast service (for example, AF network element) to the target access network device, so as to ensure the continuity of the first multicast service and further reduce the transmission path of the first multicast service.
  • the communication method provided in the embodiment of the present application further includes:
  • the SMF network element sends a message 3 to the target access network device through the signaling connection related to the first terminal device.
  • the target access network device receives the message 3 from the SMF network element through the signaling connection.
  • the message 3 includes the identifier of the first multicast session corresponding to the first multicast service, and the message 3 is used to request the target access network device to associate the first terminal device with the first multicast session.
  • the identifier of the first multicast session corresponding to the first multicast service may be the first identifier and the identifier of the first multicast session.
  • step S1212b for processing after the target access network device receives the identifier of the first multicast session corresponding to the first multicast service, reference may be made to the related description in step S1212b above, and details are not described herein again.
  • each network element in the foregoing steps can be executed by the processor 301 in the communication device 300 shown in FIG. 3 calling the application program code stored in the memory 303, which is not limited in this embodiment.
  • the communication method includes the following steps:
  • S1501-S1506 are the same as steps S1001-S1006 in the embodiment shown in FIG. 10, and related descriptions can refer to the embodiment shown in FIG. 10, which will not be repeated here.
  • the target access network device sends a path switching request message to the AMF network element.
  • the AMF network element receives the path switching request message from the target access network device.
  • the AMF network element is an AMF network element registered by the first terminal device.
  • the path switch request message may include information 4, and the information 4 includes one or more of the following: a first identifier, an identifier of the first multicast session corresponding to the first multicast service, and the first multicast service At least one of the information of the first QoS flow and the first path information.
  • the identifier of the first multicast session corresponding to the first multicast service is allocated by the target access network device, the first QoS flow is part or all of the QoS flows in the QoS flow of the first multicast service, and the first path information It includes the IP address of the target access network device and the first tunnel identifier.
  • the information 4 further includes instruction information for requesting the SMF network element to create the first multicast session corresponding to the first multicast service.
  • the target access network device also indicates the first PDU session to the AMF network element, so that the AMF network element sends information 4 to the session management network element corresponding to the first PDU session, and the first PDU session is the first PDU session.
  • the target access network device may include the identifier of the first PDU session in the path switch request message to indicate the first PDU session to the AMF network element; and the target access network device associates information 4 with the first PDU Session association, that is, the indication information 4 is for the first PDU session.
  • the AMF network element may select the session management network element corresponding to the first PDU session according to the first PDU session indicated by the target access network device, and execute the following step S1508.
  • the AMF network element sends a message 2 to the SMF network element.
  • the SMF network element receives the message 2 from the AMF network element.
  • the SMF network element is a session management network element corresponding to the first PDU session.
  • the message 2 includes the above-mentioned information 4.
  • the message 2 may be a PDU session modification request message or other messages, which is not specifically limited in the embodiment of the present application.
  • the SMF network element may obtain the information of the first multicast service, and save the information of the first multicast service in the context corresponding to the first PDU session
  • the information of the first multicast service may include, for example, the first identifier, the information of the QoS flow of the first multicast service, the identifier of the second multicast session, the information of the source access network device, and so on.
  • the first terminal device has joined the first multicast service when it is connected to the source access network device, and the second multicast session is a multicast session corresponding to the first multicast service established by the source access network device.
  • the SMF network element replaces the identifier of the second multicast session with the identifier of the first multicast session; if the information of the source access network device is saved , The information of the target access network device is used to replace the information of the source access network device; if the above information 4 includes the information of the first QoS flow, the SMF network element saves the information of the first QoS flow for subsequent billing processing, etc. .
  • the SMF network element creates the first multicast session corresponding to the first multicast service, which can also be understood as creating the first multicast service corresponding to the Multicast context, and save the identifier of the first multicast session, the first identifier, the information of the QoS flow of the first multicast service, the information of the target access network device, etc. in the multicast context.
  • the SMF network element may also send a message to the fourth network device so as to register the first multicast session to the fourth network device, where:
  • the fourth network device For the description of the fourth network device, reference may be made to the related description in step S1309, which is not repeated here.
  • the SMF network element executes the following step S1509.
  • the SMF network element sends the first path information to the UPF network element.
  • the UPF network element receives the first path information from the SMF network element.
  • the SMF network element may send the first path information to the UPF network element through the N4 session update request message, or may also send it through other messages, which is not specifically limited in the embodiment of the present application.
  • the communication method provided in the embodiment of the present application further includes S1510a-S1510b.
  • the SMF network element sends third path information to the MCF network element.
  • the MCF network element receives the third path information from the SMF network element.
  • the MCF network element sends the third path information to the MUF network element.
  • the MUF network element receives the third path information from the MCF network element.
  • steps S1510a-S1510b can refer to the above-mentioned steps S1112a-S1112b, which will not be repeated here.
  • the data of the first multicast service can be sent from the AF network element to the target access network device through the MUF network element and the M-UPF network element, and then sent from the target access network device to the first terminal device.
  • the SMF network element sends a response message to the target access network device through the AMF network element.
  • the target access network device receives the response message from the SMF network element through the AMF network element.
  • the response message includes the identifier of the first multicast session corresponding to the first multicast service.
  • the target access network device may add the first terminal device to the first multicast session, so that the first terminal device can subsequently pass through The target access network device receives the data of the first multicast service.
  • the wireless configuration information used in the transmission of the multicast service can be sent to the first terminal device, so that the first terminal device can configure , Thereby reducing the delay of the multicast service caused by the handover of the first terminal device across the access network device; on the other hand, the first multicast session corresponding to the first multicast service can be established on the target access network device, and then Establish a transmission path for the data of the first multicast service from the provider of the first multicast service (for example, AF network element) to the target access network device, so as to ensure the continuity of the first multicast service and further reduce the transmission path of the first multicast service.
  • each network element in the foregoing steps can be executed by the processor 301 in the communication device 300 shown in FIG. 3 calling the application program code stored in the memory 303, which is not limited in this embodiment.
  • an embodiment of the present application also provides a communication device.
  • the communication device may be the target access network device in the foregoing method embodiment, or a device including the target access network device, or may be used for the target access network device.
  • the communication device may be the source access network device in the above method embodiment, or the device containing the source access network device, or can be used for the source access network device Component (such as a chip or a system on a chip); or, the communication device may be the first network device in the above method embodiment, or a device containing the above first network device, or a component that can be used for the first network device (such as a chip Or system-on-chip); or, the communication device may be the first session management network element in the foregoing method embodiment, or a device including the foregoing first session management network element, or a component that can be used for the first session management network element ( Such as chip or system on chip).
  • the communication device includes hardware structures and/or software modules corresponding to various functions.
  • the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software-driven hardware depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.
  • FIG. 16 shows a schematic structural diagram of a target access network device 160.
  • the target access network device 160 includes: a processing module 1601 and a transceiver module 1602.
  • the transceiver module 1602 may also be referred to as a transceiver unit to implement a transceiver function, for example, it may be a transceiver circuit, a transceiver, a transceiver or a communication interface.
  • the transceiver module 1602 is used to receive a first identifier from the source access network device, the first identifier is used to identify the first multicast service; the processing module 1601 is used to determine whether the data of the first multicast service is in the target access.
  • the transceiver module 1602 is also used to receive signal measurement information from the target cell of the source access network device, and the target cell belongs to the target access network device; the processing module 1601 is used to determine whether the data of the first multicast service is The transmission mode between the target access network device and the first terminal device includes: a processing module 1601, configured to determine the transmission mode according to signal measurement information and/or a first quantity, where the first quantity is the reception of the first terminal device through the target access network device The number of terminal devices for data of a multicast service.
  • the transceiver module 1602 is further configured to receive information about the quality of service QoS flow of the first multicast service from the source access network device; the processing module 1601 is also configured to receive information about the QoS flow of the first multicast service according to the To obtain the wireless configuration information corresponding to the transmission mode.
  • the transceiver module 1602 is further configured to send a first message to the first network device, where the first message includes a first identifier, and the first message is used to request the establishment of a first multicast session corresponding to the first multicast service .
  • the transceiver module 1602 is further configured to receive second information of the first multicast service, where the second information of the first multicast service includes: at least one of the identifier of the first multicast session and the second path information , wherein the second path information includes a multicast address and a second tunnel identifier, the multicast address is used for the target access network device to receive the data of the first multicast service in a multicast manner, and the second tunnel identifier is used to identify the target access The network device receives the multicast tunnel of the data of the first multicast service in a multicast manner.
  • the transceiver module 1602 is further configured to send first indication information and third information of the first multicast service, where the first indication information is used to instruct the first terminal device to move to the target access network device, and the first multicast service
  • the third information of the service includes at least one of the first identifier, the identifier of the first multicast session corresponding to the first multicast service, and the information of the first QoS flow of the first multicast service, where the first QoS The flow is part or all of the QoS flow in the QoS flow of the first multicast service.
  • the target access network device 160 is presented in the form of dividing various functional modules in an integrated manner.
  • the "module” here may refer to a specific ASIC, a circuit, a processor and memory that executes one or more software or firmware programs, an integrated logic circuit, and/or other devices that can provide the above-mentioned functions.
  • the target access network device 160 may adopt the form shown in FIG. 3.
  • the processor 301 in FIG. 3 may invoke the computer execution instructions stored in the memory 303 to enable the target access network device 160 to execute the communication method in the foregoing method embodiment.
  • the functions/implementation process of the transceiver module 1602 and the processing module 1601 in FIG. 16 may be implemented by the processor 301 in FIG. 3 calling a computer execution instruction stored in the memory 303.
  • the function/implementation process of the processing module 1601 in FIG. 16 may be implemented by the processor 301 in FIG. 3 calling computer execution instructions stored in the memory 303, and the function/implementation process of the transceiver module 1602 in FIG.
  • the communication interface 304 in 3 is implemented.
  • the target access network device 160 provided in this embodiment can perform the above-mentioned communication method, the technical effects that can be obtained can refer to the above-mentioned method embodiment, and will not be repeated here.
  • FIG. 17 shows a schematic structural diagram of a first network device 170.
  • the first network device 170 includes: a processing module 1701 and a transceiver module 1702.
  • the transceiving module 1702 may also be called a transceiving unit for implementing transceiving functions, for example, it may be a transceiving circuit, a transceiver, a transceiver or a communication interface.
  • the transceiver module 1702 is configured to receive a first message, the first message includes a first identifier, the first identifier is used to identify the first multicast service, and the first message is used by the target access network device to request the establishment of the first multicast service Corresponding first multicast session; when the target access network device is located within the service range of the first multicast service, the processing module 1701 is configured to establish a first multicast session corresponding to the first multicast service.
  • the first message further includes information of the target access network device
  • the processing module 1701 is further configured to determine that the target access network device is located within the service range of the first multicast service according to the information of the target access network device.
  • the first message further includes first path information
  • the transceiver module 1702 is further configured to send the first path information to the second network device.
  • the transceiver module 1702 is further configured to send at least one of the identifier of the first multicast session and the second path information, where the second path information includes the multicast address and the second tunnel identifier, and the multicast address is used for
  • the target access network device receives the data of the first multicast service in a multicast manner
  • the second tunnel identifier is used to identify the multicast tunnel through which the target access network device receives the data of the first multicast service in the multicast manner.
  • the processing module 1701 is further configured to obtain policy information of the first multicast service, where the policy information includes the service scope of the first multicast service.
  • the transceiver module 1702 is further configured to receive a second message, the second message is used to request the first network device to allow the first terminal device to receive the data of the first multicast service through the target access network device; the transceiver module 1702, It is also used to send second indication information, where the second indication information is used to indicate that the first terminal device is allowed to receive the data of the first multicast service through the target access network device.
  • the policy information of the first multicast service includes the identification of the terminal device that is allowed to receive the data of the first multicast service
  • the second message includes the identification of the first terminal device.
  • the processing module 1701 is further configured to determine that the first terminal is allowed to receive the data of the first multicast service through the target access network device.
  • the transceiver module 1702 is configured to receive information about the target access network device and a first identifier, where the first identifier is used to identify the first multicast service; and the processing module 1701 is configured to access information according to the target The information of the network device and the first identifier determine that the target access network device has not established a multicast session corresponding to the first multicast service; the transceiver module 1702 is also used to send a third message, which is used to request the target access network The device establishes a first multicast session corresponding to the first multicast service.
  • the transceiver module 1702 is further configured to receive at least one of the identifier of the first multicast session corresponding to the first multicast service and the first path information, where the first path information includes the information of the target access network device The IP address and the first tunnel identifier, where the first tunnel identifier is used to identify the unicast tunnel through which the target access network device receives the data of the first multicast service.
  • the transceiver module 1702 is further configured to send a third message, including: when the target access network device is within the service range of the first multicast service, the transceiver module 1702 is also configured to send a third message.
  • the processing module 1701 is further configured to determine, according to the information of the target access network device, that the target access network device is located within the service range of the first multicast service.
  • the processing module 1701 is further configured to obtain policy information of the first multicast service, where the policy information of the first multicast service includes the service scope of the first multicast service.
  • the transceiver module 1702 is further configured to receive a fourth message, and the fourth message is used to request the first network device to allow the first terminal device to receive the data of the first multicast service through the target access network device; the transceiver module 1702, It is also used to send third indication information, where the third indication information is used to indicate that the first terminal device is allowed to receive the data of the first multicast service through the target access network device.
  • the policy information of the first multicast service includes the identification of the terminal device that is allowed to receive the data of the first multicast service; the fourth message includes the identification of the first terminal device; when the information of the policy is allowed to receive the data of the first multicast service
  • the processing module 1701 is further configured to determine that the first terminal is allowed to receive the data of the first multicast service through the target access network device.
  • the first network device 170 is presented in the form of dividing various functional modules in an integrated manner.
  • the "module” here may refer to a specific ASIC, a circuit, a processor and memory that executes one or more software or firmware programs, an integrated logic circuit, and/or other devices that can provide the above-mentioned functions.
  • the first network device 170 may adopt the form shown in FIG. 3.
  • the processor 301 in FIG. 3 may invoke the computer-executable instructions stored in the memory 303, so that the first network device 170 executes the communication method in the foregoing method embodiment.
  • the functions/implementation process of the transceiver module 1702 and the processing module 1701 in FIG. 17 may be implemented by the processor 301 in FIG. 3 calling a computer execution instruction stored in the memory 303.
  • the function/implementation process of the processing module 1701 in FIG. 17 may be implemented by the processor 301 in FIG. 3 calling computer execution instructions stored in the memory 303, and the function/implementation process of the transceiver module 1702 in FIG.
  • the communication interface 304 in 3 is implemented.
  • the first network device 170 provided in this embodiment can execute the above-mentioned communication method, the technical effects that can be obtained can refer to the above-mentioned method embodiment, and will not be repeated here.
  • FIG. 18 shows a schematic structural diagram of a first session management network element 180.
  • the first session management network element 180 includes: a processing module 1801 and a transceiver module 1802.
  • the transceiver module 1802 may also be referred to as a transceiver unit to implement a transceiver function, for example, it may be a transceiver circuit, a transceiver, a transceiver or a communication interface.
  • the transceiver module 1802 is configured to receive first indication information and first identification information, the first indication information is used to instruct the first terminal device to move to the target access network device, and the first identification information is the first identification or the first PDU session
  • the first identifier is used to identify the first multicast service, and the first PDU session is the PDU session used when the first terminal device joins the first multicast service
  • the processing module 1801 is configured to send and receive data according to the first indication information.
  • the module 1802 sends the information of the target access network device and the first identifier to the first network device.
  • the processing module 1801 is further configured to obtain the first identifier from the context corresponding to the first PDU session according to the identifier of the first PDU session.
  • the transceiver module 1802 is further configured to receive the identifier of the first multicast session corresponding to the first multicast service from the first network device; the transceiver module 1802 is also configured to send the first group to the target access network device The identifier of the first multicast session corresponding to the broadcast service.
  • the transceiver module 1802 is further configured to send a fourth message to the first network device, and the fourth message is used to request the first network device to allow the first terminal device to receive the data of the first multicast service through the target access network device.
  • the transceiver module 1802 is also used to receive the third indication information from the first network device, the third indication information is used to indicate that the first terminal is allowed to receive the data of the first multicast service through the target access network device.
  • the processing module 1801 is further configured to determine that the first terminal device is allowed to receive the data of the first multicast service through the target access network device.
  • the processing module 1801 is further configured to determine that the first terminal device is allowed to receive the data of the first multicast service through the target access network device, including: the processing module 1801 is further configured to obtain policy information of the first terminal device, The policy information of the first terminal device includes information about the area where the first terminal device receives the data of the first multicast service; when the target access network device is located in the area indicated by the area information, the processing module 1801 is also used to determine that the first The terminal device receives the data of the first multicast service through the target access network device.
  • the transceiver module 1802 is further configured to receive information about the first QoS flow of the first multicast service from the target access network device, where the first QoS flow is part or all of the QoS flow of the first multicast service QoS flow.
  • the transceiver module 1802 is configured to receive first indication information and first identification information, the first indication information is used to instruct the first terminal device to move to the target access network device, and the first identification information is the first identification or the first PDU session
  • the first identifier is used to identify the first multicast service, and the first PDU session is the PDU session used by the first terminal device to join the first multicast service
  • the processing module 1801 is used to access the network device according to the information And the first identification information, it is determined that the target access network device has not established a multicast session corresponding to the first multicast service
  • the transceiver module 1802 is also used to send a fifth message to the target access network device, and the fifth message is used to request the target
  • the access network device establishes a first multicast session corresponding to the first multicast service.
  • the transceiver module 1802 is further configured to receive at least one of the identifier of the first multicast session corresponding to the first multicast service and the first path information, where the first path information includes the information of the target access network device The IP address and the first tunnel identifier, where the first tunnel identifier is used to identify the unicast tunnel through which the target access network device receives the data of the first multicast service.
  • the processing module 1801 is configured to determine, according to the information of the target access network device and the first identification information, that the target access network device has not established a multicast session corresponding to the first multicast service, including: a processing module 1801, The sixth message is sent to the fourth network device through the transceiver module 1802, the sixth message is used to query the multicast session corresponding to the first multicast service established by the target access network device, and the sixth message includes the information of the target access network device And the first identifier; the processing module 1801 is also configured to receive fourth indication information from the fourth network device through the transceiver module 1802, the fourth indication information is used to indicate that the target access network device has not established a group corresponding to the first multicast service Broadcast session.
  • the transceiver module 1802 is further configured to send a seventh message to the fourth network device.
  • the seventh message is used to register the first multicast session to the fourth network device, and the seventh message includes information about the target access network device. , The first identifier, and the identifier of the first multicast session.
  • the transceiver module 1802 is also used to send a fifth message to the target access network device, including: when the target access network device is within the service range of the first multicast service, the transceiver module 1802 is also used to send The target access network device sends the fifth message.
  • the processing module 1801 is further configured to determine, according to the information of the target access network device, that the target access network device is located within the service range of the first multicast service.
  • the processing module 1801 is further configured to obtain policy information of the first multicast service, where the policy information includes the service scope of the first multicast service.
  • the first session management network element 180 is presented in the form of dividing various functional modules in an integrated manner.
  • the "module” here may refer to a specific ASIC, a circuit, a processor and memory that executes one or more software or firmware programs, an integrated logic circuit, and/or other devices that can provide the above-mentioned functions.
  • the first session management network element 180 may adopt the form shown in FIG. 3.
  • the processor 301 in FIG. 3 may invoke the computer-executable instructions stored in the memory 303, so that the first session management network element 180 executes the communication method in the foregoing method embodiment.
  • the functions/implementation process of the transceiver module 1802 and the processing module 1801 in FIG. 18 may be implemented by the processor 301 in FIG. 3 calling a computer execution instruction stored in the memory 303.
  • the function/implementation process of the processing module 1801 in FIG. 18 may be implemented by the processor 301 in FIG. 3 calling computer execution instructions stored in the memory 303, and the function/implementation process of the transceiver module 1802 in FIG.
  • the communication interface 304 in 3 is implemented.
  • the first session management network element 180 provided in this embodiment can execute the above-mentioned communication method, the technical effects that can be obtained can refer to the above-mentioned method embodiment, and will not be repeated here.
  • FIG. 19 shows a schematic structural diagram of a source access network device 190.
  • the source access network device 190 includes: a processing module 1901 and a transceiver module 1902.
  • the transceiver module 1902 may also be referred to as a transceiver unit to implement a transceiver function, for example, it may be a transceiver circuit, transceiver, transceiver or communication interface.
  • the processing module 1901 is configured to obtain a first identifier; the transceiver module 1902 is configured to send a first identifier to the target access network device, where the first identifier is used to identify the first multicast service; the transceiver module 1902 is also configured to receive data from the target
  • the wireless configuration information of the access network device corresponds to the transmission mode of the wireless configuration information and the first multicast service data between the target access network device and the first terminal device, and the transmission mode includes unicast mode or multicast mode;
  • the module 1902 is also used to send wireless configuration information to the first terminal device.
  • the transceiver module 1902 is further configured to send signal measurement information of the target cell to the target access network device.
  • the target cell belongs to the target access network device, and the signal measurement information is used for the target access network device to determine the transmission mode.
  • the transceiver module 1902 is further configured to send information about the quality of service QoS flow of the first multicast service to the target access network device.
  • the processing module 1901 is further configured to obtain the context of the second multicast session according to the first identifier, or the processing module 1901 is further configured to obtain the context of the second multicast session according to the identifier of the second multicast session Context, the context of the second multicast session includes the information of the QoS flow of the first multicast service, and the second multicast session is the multicast session corresponding to the first multicast service established by the source access network device.
  • the processing module 1901 is configured to obtain the first identifier, and includes: the processing module 1901 is configured to obtain the first identifier from the context of the first terminal device.
  • the processing module 1901 is further configured to obtain the identifier of the multicast session corresponding to the first multicast service established by the source access network device from the context of the first terminal device.
  • the source access network device 190 is presented in the form of dividing various functional modules in an integrated manner.
  • the "module” here may refer to a specific ASIC, a circuit, a processor and memory that executes one or more software or firmware programs, an integrated logic circuit, and/or other devices that can provide the above-mentioned functions.
  • the source access network device 190 may adopt the form shown in FIG. 3.
  • the processor 301 in FIG. 3 may invoke the computer-executable instructions stored in the memory 303, so that the source access network device 190 executes the communication method in the foregoing method embodiment.
  • the functions/implementation process of the transceiver module 1902 and the processing module 1901 in FIG. 19 can be implemented by the processor 301 in FIG. 3 calling a computer execution instruction stored in the memory 303.
  • the function/implementation process of the processing module 1901 in FIG. 19 may be implemented by the processor 301 in FIG. 3 calling a computer execution instruction stored in the memory 303, and the function/implementation process of the transceiver module 1902 in FIG.
  • the communication interface 304 in 3 is implemented.
  • the source access network device 190 provided in this embodiment can execute the above-mentioned communication method, the technical effects that can be obtained can refer to the above-mentioned method embodiment, and will not be repeated here.
  • the computer may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • a software program it can be implemented in the form of a computer program product in whole or in part.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium.
  • the computer instructions may be transmitted from a website, computer, server, or data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer, or may include one or more data storage devices such as servers and data centers that can be integrated with the medium.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)).

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Abstract

本申请提供通信方法、设备及系统，应用于第一终端设备从源接入网设备移动到目标接入网设备的场景，可以降低由于跨接入网设备切换引起的组播业务时延。该通信方法包括：源接入网设备向目标接入网设备发送第一标识，该第一标识用于标识第一组播业务，相应的，目标接入网设备接收来自源接入网设备的第一标识，并确定第一组播业务的数据在目标接入网设备和第一终端设备之间的传输方式，该传输方式包括单播方式或组播方式，之后，目标接入网设备通过源接入网设备向第一终端设备发送该传输方式对应的无线配置信息。

Description

通信方法、设备及系统
本申请要求于2019年11月07日提交国家知识产权局、申请号为201911083728.4、申请名称为“通信方法、设备及系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，尤其涉及通信方法、设备及系统。
背景技术
现有的第4代(4th generation，4G)网络传输组播业务时，需要通过专用的广播信道周期性地广播组播业务的空口配置信息(例如，数据无线承载(data radio bearer，DRB)信息等)，终端设备通过监听该广播信道获取组播业务的空口配置信息，从而进行相应的配置并接收组播业务。然而，由于该方案需要专用的广播信道广播组播业务的空口配置信息，导致频谱利用率较低，此外，对终端设备的要求也较高。
基于此，在第五代(5th generation，5G)网络中，欧洲标准组织5G XCast提出复用终端设备的单播信道向终端设备发送组播业务的空口配置信息，以提高频谱利用率，同时，终端设备无需监听专用的广播信道接收组播业务的空口配置信息，从而简化了终端设备的设计，降低了对终端设备的要求。
然而，在5G网络中，终端设备从源基站切换到目标基站时，如何减少由于跨基站切换引起的组播业务的中断时延，目前并没有相关的解决方案。
发明内容
本申请实施例提供一种通信方法、设备及系统，可以降低由于跨接入网设备切换引起的组播业务时延。
为达到上述目的，本申请的实施例采用如下技术方案：
第一方面，提供了一种通信方法及相应的装置。该方案应用于第一终端设备从源接入网设备移动到目标接入网设备的场景，该方案中，目标接入网设备接收来自源接入网设备的第一标识，该第一标识用于标识第一组播业务；目标接入网设备确定第一组播业务的数据在目标接入网设备和第一终端设备之间的传输方式，该传输方式包括单播方式和组播方式；目标接入网设备通过源接入网设备向第一终端设备发送该传输方式对应的无线配置信息。
本申请实施例提供的通信方法中，第一终端设备从源接入网设备移动至目标接入网设备之前，源接入网设备向目标接入网设备发送用于标识第一组播业务的第一标识，以便目标接入网设备能够确定第一组播业务的数据在目标接入网设备和第一终端设备之间的传输方式，并向源接入网设备发送传输方式对应的无线配置信息，进而，源接入网设备可以将该无线配置信息发送给第一终端设备。后续在第一终端设备移动至目标接入网设备或切换至目标接入网设备时，可以无需等待目标接入网设备下发配置信息，而根据切换前目标接入网设备通过源接入网设备发送的该无线配置信息进行配置。也就是说，基于本申请实施例提供的通信方法，可以在第一终端设备发生移动或切换前，将传输组播业务时使用的无线配置信息发送给第一终端设备，从而降低由第一终 端设备跨接入网设备切换引起的组播业务的时延。
在一种可能的设计中，上述传输方式为组播方式，该传输方式对应的无线配置信息包括调度指示信息，该调度指示信息用于确定第一组播业务的调度信息，该调度信息用于指示传输第一组播业务的无线资源。
基于该方案，在第一终端设备切换至目标接入网设备后，可以使第一终端设备根据该调度指示信息确定传输第一组播业务的无线资源，并在该无线资源上接收第一组播业务的数据，从而进一步降低由于跨接入网设备切换引起的组播业务的时延。
在一种可能的设计中，该通信方法还包括：目标接入网设备接收来自源接入网设备的目标小区的信号测量信息，该目标小区属于目标接入网设备；目标接入网设备确定第一组播业务的数据在目标接入网设备和第一终端设备之间的传输方式，包括：目标接入网设备根据目标小区的信号测量信息和/或第一数量确定该传输方式，该第一数量为通过目标接入网设备接收第一组播业务的数据的终端设备的数量。
基于该方案，目标接入网设备可以根据目标小区的信号测量信息和/或通过所述目标接入网设备接收所述第一组播业务的数据的终端设备的数量，合理灵活地确定第一组播业务的数据在目标接入网设备和第一终端设备之间的传输方式，从而降低传输开销，或者提高第一终端设备的接收质量。
在一种可能的设计中，该通信方法还包括：目标接入网设备接收来自源接入网设备的第一组播业务的服务质量QoS流的信息；目标接入网设备根据第一组播业务的QoS流的信息，获得传输方式对应的无线配置信息。
在一种可能的设计中，该通信方法还包括：目标接入网设备向第一网络设备发送第一消息，该第一消息包括第一标识，该第一消息用于请求建立第一组播业务对应的第一组播会话。
基于该方案，可以在目标接入网设备上建立第一组播业务对应的第一组播会话，进而建立第一组播业务的数据由第一组播业务的提供者到目标接入网设备的传输路径，从而保证第一组播业务的连续性，进一步降低由第一终端设备跨接入网设备切换引起的组播业务的时延。
在一种可能的设计中，该第一消息还包括目标接入网设备的信息。基于该方案，可以使第一网络设备根据目标接入网设备的信息，确定目标接入网设备位于第一组播业务的服务范围内，进而为目标接入网设备建立第一组播业务对应的第一组播会话。
在一种可能的设计中，该第一消息还包括第一组播业务的第一信息，该第一组播业务的第一信息包括第一组播会话的标识和第一路径信息中的至少一项，其中，第一路径信息包括目标接入网设备的IP地址和第一隧道标识，第一隧道标识用于标识目标接入网设备接收第一组播业务的数据的单播隧道。
基于该方案，当第一组播业务的第一信息包括第一组播会话的标识时，后续可以使第一网络设备根据该第一组播会话的标识对该第一组播会话进行修改等；当第一组播业务的第一信息包括第一路径信息时，可以为第一组播业务的数据传输建立用户面网元与目标接入网设备之间的隧道，从而可以使第一组播业务的数据由用户面网元传输至目标接入网设备，再由目标接入网设备传输至第一终端设备。
在一种可能的设计中，该通信方法还包括：目标接入网设备接收第一组播业务的 第二信息，该第一组播业务的第二信息包括：第一组播会话的标识和第二路径信息中的至少一项，其中，第二路径信息包括组播地址和第二隧道标识，组播地址用于目标接入网设备通过组播方式接收第一组播业务的数据，第二隧道标识用于标识目标接入网设备通过组播方式接收第一组播业务的数据的组播隧道。
基于该方案，当第一组播业务的第二信息包括第一组播会话的标识时，后续可以使目标网络设备将第一终端设备加入第一组播会话；当第一组播业务的第二信息包括第二路径信息时，可以使目标接入网设备根据该第二路径信息接收第一组播业务的数据，从而将该第一组播业务的数据传输至第一终端设备。
在一种可能的设计中，该通信方法还包括：目标接入网设备发送第一指示信息和第一组播业务的第三信息，该第一指示信息用于指示第一终端设备移动至目标接入网设备，第一组播业务的第三信息包括：第一标识、第一组播业务对应的第一组播会话的标识、以及第一组播业务的第一QoS流的信息中的至少一项，其中，该第一QoS流为第一组播业务的QoS流中的部分或全部QoS流。
第二方面，提供了一种通信方法及相应的装置。该方案应用于第一终端设备从源接入网设备移动到目标接入网设备的场景，该方案中，第一网络设备接收第一消息，该第一消息包括第一标识，该第一标识用于标识第一组播业务，该第一消息用于目标接入网设备请求建立第一组播业务对应的第一组播会话；当目标接入网设备位于第一组播业务的服务范围内时，第一网络设备建立第一组播业务对应的第一组播会话。
基于该方案，可以在目标接入网设备上建立第一组播业务对应的第一组播会话，进而建立第一组播业务的数据由第一组播业务的提供者到目标接入网设备的传输路径，从而保证第一组播业务的连续性，进一步降低由第一终端设备跨接入网设备切换引起的组播业务的时延。
在一种可能的设计中，该第一消息还包括目标接入网设备的信息，该通信方法还包括：第一网络设备根据目标接入网设备的信息，确定目标接入网设备位于第一组播业务的服务范围内。
在一种可能的设计中，该第一消息还包括第一组播业务的第一信息，该第一组播业务的第一信息包括第一组播会话的标识和第一路径信息中的至少一项，其中，第一路径信息包括目标接入网设备的IP地址和第一隧道标识，第一隧道标识用于标识目标接入网设备接收第一组播业务的数据的单播隧道。
在一种可能的设计中，第一组播业务的第一信息包括第一信息，该通信方法还包括：第一网络设备向第二网络设备发送第一路径信息。
基于该方案，当第一组播业务的第一信息包括第一组播会话的标识时，后续可以使第一网络设备根据该第一组播会话的标识对该第一组播会话进行修改等；当第一组播业务的第一信息包括第一路径信息时，可以为第一组播业务的数据传输建立用户面网元与目标接入网设备之间的隧道，从而可以使第一组播业务的数据由用户面网元传输至目标接入网设备，再由目标接入网设备传输至第一终端设备。
在一种可能的设计中，该通信方法还包括：第一网络设备发送第一组播会话的标识和第二路径信息中的至少一项，其中，第二路径信息包括组播地址和第二隧道标识，组播地址用于目标接入网设备通过组播方式接收第一组播业务的数据，第二隧道标识 用于标识目标接入网设备通过组播方式接收第一组播业务的数据的组播隧道。
基于该方案，当第一组播业务的第二信息包括第一组播会话的标识时，后续可以使目标网络设备将第一终端设备加入第一组播会话；当第一组播业务的第二信息包括第二路径信息时，可以使目标接入网设备根据该第二路径信息接收第一组播业务的数据，从而将该第一组播业务的数据传输至第一终端设备。
在一种可能的设计中，该通信方法还包括：第一网络设备获取第一组播业务的策略信息，该第一组播业务的策略信息包括第一组播业务的服务范围。
在一种可能的设计中，该通信方法还包括：第一网络设备接收第二消息，该第二消息用于请求第一网络设备允许第一终端设备通过目标接入网设备接收第一组播业务的数据；第一网络设备发送第二指示信息，该第二指示信息用于指示允许第一终端设备通过目标接入网设备接收第一组播业务的数据。
基于该方案，只有当第一网络设备允许第一终端通过目标接入网设备接收第一组播业务的数据时，目标接入网设备才继续向第一终端设备发送第一组播业务的数据，可以防止第一终端设备在不被允许接收第一组播业务的情况下仍然将第一组播业务的数据发送给第一终端设备的情况发生。
在一种可能的设计中，第一组播业务的策略信息包括允许接收第一组播业务的数据的终端设备的标识，第二消息包括第一终端设备的标识，该通信方法还包括：当允许接收第一组播业务的数据的终端设备的标识包括第一终端设备的标识时，第一网络设备确定允许第一终端通过目标接入网设备接收第一组播业务的数据。
第三方面，提供了一种通信方法及相应的装置。该方案应用于第一终端设备从源接入网设备移动到目标接入网设备的场景，该方案中，源接入网设备向目标接入网设备发送第一标识，该第一标识用于标识第一组播业务；源接入网设备接收来自目标接入网设备的无线配置信息，无线配置信息与第一组播业务的数据在目标接入网设备和第一终端设备之间的传输方式对应，传输方式包括单播方式或组播方式；源接入网设备向第一终端设备发送无线配置信息。其中，第三方面及其可能的设计方式所带来的技术效果可参见上述第一方面及其可能的设计方式所带来的技术效果，此处不再赘述。
在一种可能的设计中，该传输方式为组播方式，无线配置信息包括调度指示信息，调度指示信息用于确定第一组播业务的调度信息，调度信息用于指示传输第一组播业务的无线资源。
在一种可能的设计中，该通信方法还包括：源接入网设备向目标接入网设备发送目标小区的信号测量信息，目标小区属于目标接入网设备，信号测量信息用于目标接入网设备确定传输方式。
在一种可能的设计中，该通信方法还包括：源接入网设备向目标接入网设备发送第一组播业务的QoS流的信息。
在一种可能的设计中，该通信方法还包括：源接入网设备根据第一标识，获取第二组播会话的上下文，或者，源接入网设备根据第二组播会话的标识，获取第二组播会话的上下文，其中，第二组播会话的上下文包括第一组播业务的QoS流的信息，第二组播会话为源接入网设备所建立的第一组播业务对应的组播会话。
在一种可能的设计中，该通信方法还包括：源接入网设备从第一终端设备的上下 文中获取第一标识或源接入网设备所建立的第一组播业务对应的组播会话的标识。
基于该方案，可以使源接入网设备将第一标识发送给目标接入网设备，进而将第一终端设备加入的第一标识所标识的第一组播业务切换至目标接入网设备，避免在第一终端设备切换至目标接入网设备后，重新执行加入第一组播业务的流程，从而降低由于跨接入网设备切换引起的第一组播业务的时延。
第四方面，提供了一种通信方法及相应的装置，该方案应用于第一终端设备从源接入网设备移动到目标接入网设备的场景。该方案中，第一网络设备接收目标接入网设备的信息和第一标识，该第一标识用于标识第一组播业务；第一网络设备根据目标接入网设备的信息和第一标识，确定目标接入网设备未建立第一组播业务对应的组播会话；第一网络设备发送第三消息，该第三消息用于请求目标接入网设备建立第一组播业务对应的第一组播会话。
基于该方案，可以在目标接入网设备上建立第一组播业务对应的第一组播会话，进而建立第一组播业务的数据由第一组播业务的提供者到目标接入网设备的传输路径，从而保证第一组播业务的连续性，进一步降低由第一终端设备跨接入网设备切换引起的组播业务的时延。
在一种可能的设计中，该第三消息包括第一组播业务对应的第一组播会话的标识和第二路径信息中的至少一项，其中，第二路径信息包括组播地址和第二隧道标识，组播地址用于目标接入网设备通过组播方式接收第一组播业务的数据，第二隧道标识用于标识目标接入网设备通过组播方式接收第一组播业务的数据的组播隧道。
基于该方案，当第三消息包括第一组播会话的标识时，后续可以使目标网络设备将第一终端设备加入第一组播会话；当第三消息包括第二路径信息时，可以使目标接入网设备根据该第二路径信息接收第一组播业务的数据，从而将该第一组播业务的数据传输至第一终端设备。
在一种可能的设计中，该通信方法还包括：第一网络设备接收第一组播业务对应的第一组播会话的标识和第一路径信息中的至少一项，第一路径信息包括目标接入网设备的IP地址和第一隧道标识，第一隧道标识用于标识目标接入网设备接收第一组播业务的数据的单播隧道。
基于该方案，当接收第一组播会话的标识时，后续可以使第一网络设备根据该第一组播会话的标识对该第一组播会话进行修改等；当接收第一路径信息时，可以为第一组播业务的数据传输建立用户面网元与目标接入网设备之间的隧道，从而可以使第一组播业务的数据由用户面网元传输至目标接入网设备，再由目标接入网设备传输至第一终端设备。
在一种可能的设计方式中，第一网络设备发送第三消息，包括：当目标接入网设备位于第一组播业务的服务范围内时，第一网络设备发送第三消息。
在一种可能的设计方式中，该通信方法还包括：第一网络设备根据目标接入网设备的信息，确定目标接入网设备位于第一组播业务的服务范围内。
在一种可能的设计方式中，该通信方法还包括：第一网络设备获取第一组播业务的策略信息，第一组播业务的策略信息包括第一组播业务的服务范围。
在一种可能的设计方式中，该通信方法还包括：第一网络设备接收第四消息，第 四消息用于请求第一网络设备允许第一终端设备通过目标接入网设备接收第一组播业务的数据；第一网络设备发送第三指示信息，第三指示信息用于指示允许第一终端设备通过目标接入网设备接收第一组播业务的数据。
基于该方案，只有当第一网络设备允许第一终端通过目标接入网设备接收第一组播业务的数据时，目标接入网设备才继续向第一终端设备发送第一组播业务的数据，可以防止第一终端设备在不被允许接收第一组播业务的情况下仍然将第一组播业务的数据发送给第一终端设备的情况发生。
在一种可能的设计中，第一组播业务的策略信息包括允许接收第一组播业务的数据的终端设备的标识，第四消息包括第一终端设备的标识，该通信方法还包括：当允许接收第一组播业务的数据的终端设备的标识包括第一终端设备的标识时，第一网络设备确定允许第一终端通过目标接入网设备接收第一组播业务的数据。
第五方面，提供了一种通信方法及相应的装置，该方案应用于第一终端设备从源接入网设备移动到目标接入网设备的场景。该方案中，第一会话管理网元接收第一指示信息和第一标识信息，该第一指示信息用于指示第一终端设备移动至目标接入网设备，第一标识信息为第一标识或第一PDU会话的标识，第一标识用于标识第一组播业务，第一PDU会话为第一终端设备加入第一组播业务时所使用的PDU会话；第一会话管理网元根据第一指示信息，向第一网络设备发送目标接入网设备的信息和第一标识。
基于该方案，由于第一会话管理网元向第一网络设备发送目标接入网设备的信息和第一标识，因此可以使第一网络设备在目标接入网设备上建立第一组播业务对应的第一组播会话，进而建立第一组播业务的数据由第一组播业务的提供者到目标接入网设备的传输路径，从而保证第一组播业务的连续性，进一步降低由第一终端设备跨接入网设备切换引起的组播业务的时延。
在一种可能的设计中，第一标识信息为第一PDU会话的标识，该通信方法还包括：第一会话管理网元根据第一PDU会话的标识，从第一PDU会话对应的上下文获得第一标识。
在一种可能的设计中，该通信方法还包括：第一会话管理网元接收来自第一网络设备的第一组播业务对应的第一组播会话的标识；第一会话管理网元向目标接入网设备发送第一组播业务对应的第一组播会话的标识，以使目标接入网设备将第一终端设备加入第一组播会话。
在一种可能的设计中，该通信方法还包括：第一会话管理网元向第一网络设备发送第四消息，第四消息用于请求第一网络设备允许第一终端设备通过目标接入网设备接收第一组播业务的数据；第一会话管理网元接收来自第一网络设备的第三指示信息，第三指示信息用于指示允许第一终端通过目标接入网设备接收第一组播业务的数据。
基于该方案，只有当第一网络设备允许第一终端通过目标接入网设备接收第一组播业务的数据时，目标接入网设备才继续向第一终端设备发送第一组播业务的数据，可以防止第一终端设备在不被允许接收第一组播业务的情况下仍然将第一组播业务的数据发送给第一终端设备的情况发生。
在一种可能的设计中，该通信方法还包括：第一会话管理网元确定允许第一终端 设备通过目标接入网设备接收第一组播业务的数据。
在一种可能的设计中，第一会话管理网元确定允许第一终端设备通过目标接入网设备接收第一组播业务的数据，包括：第一会话管理网元获取第一终端设备的策略信息，第一终端设备的策略信息包括第一终端设备接收第一组播业务的数据的区域信息；当目标接入网设备位于区域信息指示的区域内时，第一会话管理网元确定允许第一终端设备通过目标接入网设备接收第一组播业务的数据。
基于该方案，只有当第一会话管理网元允许第一终端通过目标接入网设备接收第一组播业务的数据时，目标接入网设备才继续向第一终端设备发送第一组播业务的数据，可以防止第一终端设备在不被允许接收第一组播业务的情况下仍然将第一组播业务的数据发送给第一终端设备的情况发生。
在一种可能的设计中，该通信方法还包括：第一会话管理网元接收来自目标接入网设备的第一组播业务的第一QoS流的信息，该第一QoS流为第一组播业务的QoS流中的部分或全部QoS流。基于该方案，可以使第一会话管理网元候选根据第一QoS流的信息进行计费等处理。
第六方面，提供了一种通信方法及相应的装置，该方案应用于第一终端设备从源接入网设备移动到目标接入网设备的场景。该方案中，第一会话管理网元接收第一指示信息和第一标识信息，该第一指示信息用于指示第一终端设备移动至目标接入网设备，第一标识信息为第一标识或第一PDU会话的标识，第一标识用于标识第一组播业务，第一PDU会话为第一终端设备加入第一组播业务时所使用的PDU会话；第一会话管理网元根据目标接入网设备的信息和第一标识信息，确定目标接入网设备未建立第一组播业务对应的组播会话；第一会话管理网元向目标接入网设备发送第五消息，第五消息用于请求目标接入网设备建立第一组播业务对应的第一组播会话。
基于该方案，第一会话管理网元可以在目标接入网设备上建立第一组播业务对应的第一组播会话，进而建立第一组播业务的数据由第一组播业务的提供者到目标接入网设备的传输路径，从而保证第一组播业务的连续性，进一步降低由第一终端设备跨接入网设备切换引起的组播业务的时延。
在一种可能的设计中，该第五消息包括第一组播业务对应的第一组播会话的标识和第二路径信息中的至少一项，其中，第二路径信息包括组播地址和第二隧道标识，组播地址用于目标接入网设备通过组播方式接收第一组播业务的数据，第二隧道标识用于标识目标接入网设备通过组播方式接收第一组播业务的数据的组播隧道。
基于该方案，当第五消息包括第一组播会话的标识时，后续可以使目标网络设备将第一终端设备加入第一组播会话；当第一组播业务的第二信息包括第二路径信息时，可以使目标接入网设备根据该第二路径信息接收第一组播业务的数据，从而将该第一组播业务的数据传输至第一终端设备。
在一种可能的设计中，该通信方法还包括：第一网络设备接收第一组播业务对应的第一组播会话的标识和第一路径信息中的至少一项，第一路径信息包括目标接入网设备的IP地址和第一隧道标识，第一隧道标识用于标识目标接入网设备接收第一组播业务的数据的单播隧道。
基于该方案，当接收第一组播会话的标识时，后续可以使第一网络设备根据该第 一组播会话的标识对该第一组播会话进行修改等；当接收第一路径信息时，可以为第一组播业务的数据传输建立用户面网元与目标接入网设备之间的隧道，从而可以使第一组播业务的数据由用户面网元传输至目标接入网设备，再由目标接入网设备传输至第一终端设备。
在一种可能的设计中，第一会话管理网元根据目标接入网设备的信息和第一标识，确定目标接入网设备未建立第一组播业务对应的组播会话，包括：第一会话管理网元向第四网络设备发送第六消息，第六消息用于查询目标接入网设备建立的第一组播业务对应的组播会话，第六消息包括目标接入网设备的信息和第一标识；第一会话管理网元接收来自第四网络设备的第四指示信息，第四指示信息用于指示目标接入网设备未建立第一组播业务对应的组播会话。
在一种可能的设计中，该通信方法还包括：第一会话管理网元向第四网络设备发送第七消息，第七消息用于将第一组播会话注册到第四网络设备，第七消息包括目标接入网设备的信息、第一标识以及第一组播会话的标识。
在一种可能的设计中，第一会话管理网元向目标接入网设备发送第五消息，包括：当目标接入网设备位于第一组播业务的服务范围内时，第一会话管理网元发送第五消息。
在一种可能的设计中，该通信方法还包括：第一会话管理网元根据目标接入网设备的信息，确定目标接入网设备位于第一组播业务的服务范围内。
在一种可能的设计中，该通信方法还包括：第一会话管理网元获取第一组播业务的策略信息，策略信息包括第一组播业务的服务范围。
第七方面，提供了一种通信装置用于实现上述各种方法。该通信装置可以为上述第一方面中的目标接入网设备，或者包含上述目标接入网设备的装置；或者，该通信装置可以为上述第二方面或第四方面中的第一网络设备，或者包含上述第一网络设备的装置；或者，该通信装置可以为上述第三方面中的源接入网设备，或者包含上述源接入网设备的装置；或者，该通信装置可以为上述第五方面或第六方面中的第一会话管理网元，或者包含上述第一会话管理网元的装置。所述通信装置包括实现上述方法相应的模块、单元、或手段(means),该模块、单元、或menas可以通过硬件实现，软件实现，或者通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块或单元。
第八方面，提供了一种通信装置，包括：处理器，还可以包括存储器；该存储器用于存储计算机指令，当该处理器执行该指令时，以使该通信装置执行上述任一方面所述的方法。该通信装置可以为上述第一方面中的目标接入网设备，或者包含上述目标接入网设备的装置；或者，该通信装置可以为上述第二方面或第四方面中的第一网络设备，或者包含上述第一网络设备的装置；或者，该通信装置可以为上述第三方面中的源接入网设备，或者包含上述源接入网设备的装置；或者，该通信装置可以为上述第五方面或第六方面中的第一会话管理网元，或者包含上述第一会话管理网元的装置。
第九方面，提供了一种通信装置，包括：处理器；所述处理器用于与存储器耦合，并读取存储器中的指令之后，根据所述指令执行如上述任一方面所述的方法。该通信 装置可以为上述第一方面中的目标接入网设备，或者包含上述目标接入网设备的装置；或者，该通信装置可以为上述第二方面或第四方面中的第一网络设备，或者包含上述第一网络设备的装置；或者，该通信装置可以为上述第三方面中的源接入网设备，或者包含上述源接入网设备的装置；或者，该通信装置可以为上述第五方面或第六方面中的第一会话管理网元，或者包含上述第一会话管理网元的装置。
第十方面，提供了一种计算机可读存储介质，该计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机可以执行上述任一方面所述的方法。
第十一方面，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，使得计算机可以执行上述任一方面所述的方法。
第十二方面，提供了一种通信装置(例如，该通信装置可以是芯片或芯片系统)，该通信装置包括处理器，用于实现上述任一方面中所涉及的功能。在一种可能的设计中，该通信装置还包括存储器，该存储器，用于保存必要的程序指令和数据。该通信装置是芯片系统时，可以由芯片构成，也可以包含芯片和其他分立器件。
第十三方面，提供了一种通信装置，包括：处理器和接口电路，该接口电路可以为代码/数据读写接口电路，该接口电路用于接收计算机执行指令(计算机执行指令存储在存储器中，可能直接从存储器读取，或可能经过其他器件)并传输至该处理器；该处理器用于运行所述计算机执行指令以执行上述任一方面所述的方法。
其中，第七方面至第十三方面中任一种设计方式所带来的技术效果可参见上述第一方面或第二方面或第三方面或第四方面或第五方面或第六方面中不同设计方式所带来的技术效果，此处不再赘述。
第十四方面，提供了一种通信方法，该通信方法应用于第一终端设备从源接入网设备移动到目标接入网设备的场景，该通信方法包括：源接入网设备向目标接入网设备发送第一标识，该第一标识用于标识第一组播业务，相应的，目标接入网设备接收来自源接入网设备的第一标识，并确定第一组播业务的数据在目标接入网设备和第一终端设备之间的传输方式，该传输方式包括单播方式或组播方式，之后，目标接入网设备向源接入网设备发送该传输方式对应的无线配置信息，源接入网设备接收到该无线配置信息后，再将该无线配置信息发送给第一终端设备。
在一种可能的设计中，该传输方式为组播方式，该无线配置信息包括调度指示信息，该调度指示信息用于确定该第一组播业务的调度信息，该调度信息用于指示传输该第一组播业务的无线资源。
在一种可能的设计中，该通信方法还包括：目标接入网设备接收来自该源接入网设备的目标小区的信号测量信息，该目标小区属于该目标接入网设备，目标接入网设备确定该第一组播业务的数据在该目标接入网设备和该第一终端设备之间的传输方式，包括：目标接入网设备根据该信号测量信息和/或第一数量确定该传输方式，该第一数量为通过该目标接入网设备接收该第一组播业务的数据的终端设备的数量。
在一种可能的设计中，该通信方法还包括：目标接入网设备向第一网络设备发送第一消息，该第一消息包括该第一标识，该第一消息用于请求建立该第一组播业务对应的第一组播会话。相应的，第一网络设备接收第一消息，当该目标接入网设备位于该第一组播业务的服务范围内时，该第一网络设备建立该第一组播业务对应的第一组 播会话。
在一种可能的设计中，该第一消息还包括该第一组播业务的第一信息，该第一组播业务的第一信息包括：该第一组播会话的标识和第一路径信息中的至少一项，其中，该第一路径信息包括该目标接入网设备的IP地址和第一隧道标识，该第一隧道标识用于标识该目标接入网设备接收该第一组播业务的数据的单播隧道。
在一种可能的设计中，该通信方法还包括：该目标接入网设备接收该第一组播业务的第二信息，该第一组播业务的第二信息包括：该第一组播会话的标识和第二路径信息中的至少一项，其中，该第二路径信息包括组播地址和第二隧道标识，该组播地址用于该目标接入网设备通过组播方式接收该第一组播业务的数据，该第二隧道标识用于标识该目标接入网设备通过组播方式接收该第一组播业务的数据的组播隧道。
在一种可能的设计中，该目标接入网设备发送第一指示信息和该第一组播业务的第三信息，该第一指示信息用于指示该第一终端设备移动至该目标接入网设备，该第一组播业务的第三信息包括：该第一标识、该第一组播业务对应的第一组播会话的标识、以及该第一组播业务的第一QoS流的信息中的至少一项，其中，该第一QoS流为该第一组播业务的QoS流中的部分或全部QoS流。
在一种可能的设计中，该通信方法还包括：第一网络设备接收该目标接入网设备的信息和第一标识，该第一标识用于标识第一组播业务；该第一网络设备根据该目标接入网设备的信息和该第一标识，确定该目标接入网设备未建立该第一组播业务对应的组播会话；该第一网络设备发送第三消息，该第三消息用于请求该目标接入网设备建立该第一组播业务对应的第一组播会话。
在一种可能的设计中，该通信方法还包括：第一会话管理网元接收第一指示信息和第一标识信息，该第一指示信息用于指示第一终端设备移动至该目标接入网设备，该第一标识信息为第一标识或第一PDU会话的标识，该第一标识用于标识第一组播业务，该第一PDU会话为该第一终端设备加入该第一组播业务时所使用的PDU会话；该第一会话管理网元根据该第一指示信息，向第一网络设备发送该目标接入网设备的信息和该第一标识。
在一种可能的设计中，该通信方法还包括：第一会话管理网元接收第一指示信息和第一标识信息，该第一指示信息用于指示该第一终端设备移动至该目标接入网设备，该第一标识信息为第一标识或第一PDU会话的标识，该第一标识用于标识第一组播业务，该第一PDU会话为该第一终端设备加入该第一组播业务时所使用的PDU会话；该第一会话管理网元根据该目标接入网设备的信息和该第一标识信息，确定该目标接入网设备未建立该第一组播业务对应的组播会话；该第一会话管理网元向该目标接入网设备发送第五消息，该第五消息用于请求该目标接入网设备建立该第一组播业务对应的第一组播会话。
其中，第十四方面中任一种设计方式所带来的技术效果可参见上述第一方面或第二方面或第三方面或第四方面或第五方面或第六方面中不同设计方式所带来的技术效果，此处不再赘述。
第十五方面，提供了一种通信系统，该通信系统包括目标接入网设备和源接入网设备。该目标接入网设备用于执行上述第一方面中，或者本申请实施例提供的方案中 由目标接入网设备执行的步骤；该源接入网设备用于执行上述第三方面中，或者本申请实施例提供的方案中由源接入网设备执行的步骤。
在一种可能的设计中，该通信系统还可以包括第一网络设备，或第一会话管理网元，该第一网络设备用于执行上述第二方面或第四方面中，或者本申请实施例提供的方案中由第一网络设备执行的步骤；该第一会话管理网元用于执行上述第五方面或第六方面中，或者本申请实施例提供的方案中由第一网络设备执行的步骤。
在一种可能的设计中，该通信系统还可以包括本申请实施例提供的方案中与目标接入网设备，或者源接入网设备，或者第一网络设备，或者第一会话管理网元进行交互的其他设备，例如第二网络设备、第三网络设备、或者第四网络设备、或者用户面网元等，本申请实施例对此不作具体限定。
本申请的这些方面或其他方面在以下实施例的描述中会更加简明易懂。
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图1a为本申请实施例提供的通信系统的结构示意图一；
图1b为本申请实施例提供的通信系统的结构示意图二；
图1c为本申请实施例提供的通信系统的结构示意图三；
图2a为本申请实施例提供的通信系统在5G网络中的应用示意图一；
图2b为本申请实施例提供的通信系统在5G网络中的应用示意图二；
图2c为本申请实施例提供的通信系统在5G网络中的应用示意图三；
图3为本申请实施例提供的一种通信设备的硬件结构示意图；
图4为本申请实施例提供的一种通信方法的流程示意图一；
图5为本申请实施例提供的一种通信方法的流程示意图二；
图6为本申请实施例提供的一种通信方法的流程示意图三；
图7为本申请实施例提供的一种通信方法的流程示意图四；
图8为本申请实施例提供的一种通信方法的流程示意图五；
图9为本申请实施例提供的一种通信方法的流程示意图六；
图10为本申请实施例提供的一种通信方法的交互流程示意图一；
图11为本申请实施例提供的一种通信方法的交互流程示意图二；
图12为本申请实施例提供的一种通信方法的交互流程示意图三；
图13为本申请实施例提供的一种通信方法的交互流程示意图四；
图14为本申请实施例提供的一种通信方法的交互流程示意图五；
图15为本申请实施例提供的一种通信方法的交互流程示意图六；
图16为本申请实施例提供的一种目标接入网设备的结构示意图；
图17为本申请实施例提供的一种第一网络设备的结构示意图；
图18为本申请实施例提供的一种第一会话管理网元的结构示意图；
图19为本申请实施例提供的一种源接入网设备的结构示意图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行描述。其中，在本申请的描述中，除非另有说明，“/”表示前后关联的对象是一种“或”的关系，例如，A/B可以表示A或B；本申请中的“和/或”仅仅是一种描述关联对象的关 联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况，其中A,B可以是单数或者复数。并且，在本申请的描述中，除非另有说明，“多个”是指两个或多于两个。“以下至少一项(个)”或其类似表达，是指的这些项中的任意组合，包括单项(个)或复数项(个)的任意组合。例如，a，b，或c中的至少一项(个)，可以表示：a，b，c，a-b，a-c，b-c，或a-b-c，其中a，b，c可以是单个，也可以是多个。另外，为了便于清楚描述本申请实施例的技术方案，在本申请的实施例中，采用了“第一”、“第二”等字样对功能和作用基本相同的相同项或相似项进行区分。本领域技术人员可以理解“第一”、“第二”等字样并不对数量和执行次序进行限定，并且“第一”、“第二”等字样也并不限定一定不同。
此外，本申请实施例提供的通信方法可适用于多种系统架构。本申请实施例描述的网络架构以及业务场景是为了更加清楚的说明本申请实施例的技术方案，并不构成对于本申请实施例提供的技术方案的限定，本领域普通技术人员可知，随着网络架构的演变和新业务场景的出现，本申请实施例提供的技术方案对于类似的技术问题，同样适用。
如图1a所示，为本申请实施例提供的通信系统10a。该通信系统10a包括源接入网设备101、目标接入网设备102、以及第一终端设备103。其中，如图1a所示，当第一终端设备103发生移动之前，第一终端设备103通过源接入网设备101接入网络；当第一终端发生移动(或切换)之后，第一终端设备103通过目标接入设备102接入网络。
其中，目标接入网设备102用于接收来自源接入网设备101的第一标识，第一标识用于标识第一组播业务；目标接入网设备102还用于确定该第一组播业务的数据在目标接入网设备102和第一终端设备之间的传输方式，该传输方式包括单播方式或组播方式；目标接入网设备102还用于通过源接入网设备101向第一终端设备103发送该传输方式对应的无线配置信息。
源接入网设备101用于向目标接入网设备102发送第一标识，并接收来自目标接入网设备102的无线配置信息；源接入网设备101还用于向第一终端设备103发送该无线配置信息。
本申请实施例提供的通信系统中，第一终端设备从源接入网设备移动至目标接入网设备之前，源接入网设备向目标接入网设备发送用于标识第一组播业务的第一标识，以便目标接入网设备能够确定第一组播业务的数据在目标接入网设备和第一终端设备之间的传输方式，并向源接入网设备发送传输方式对应的无线配置信息，进而，源接入网设备可以将该无线配置信息发送给第一终端设备。后续在第一终端设备移动至目标接入网设备或切换至目标接入网设备时，可以无需等待目标接入网设备下发配置信息，而根据切换前目标接入网设备通过源接入网设备发送的该无线配置信息进行配置。也就是说，基于本申请实施例提供的通信系统，可以在第一终端设备发生移动或切换前，将传输组播业务时使用的无线配置信息发送给第一终端设备，从而降低由第一终端设备跨接入网设备切换引起的组播业务的时延。
可选的，上述源接入网设备101或目标接入网设备102，是一种为第一终端设备 103提供无线通信功能的设备。源接入网设备101或目标接入网设备102例如包括但不限于：第五代(5th generation，5G)中的下一代基站(gnodeB，gNB)(例如源接入网设备101为S-gNB，目标接入网设备102为T-gNB)、演进型节点B(evolved node B，eNB)(例如源接入网设备101为S-eNB，目标接入网设备102为T-eNB)、无线网络控制器(radio network controller，RNC)(例如源接入网设备101为S-RNC，目标接入网设备102为S-RNC)、节点B(node B，NB)(例如源接入网设备101为S-NB，目标接入网设备102为S-NB)、基站控制器(base station controller，BSC)(例如源接入网设备101为S-BSC，目标接入网设备102为T-BSC)、基站收发台(base transceiver station，BTS)(例如源接入网设备101为S-BTS，目标接入网设备102为S-BTS)、家庭基站(例如，home evolved nodeB，或home node B，HNB)(例如源接入网设备101为S-HNB，目标接入网设备102为T-HNB)、基带单元(baseBand unit，BBU)(例如源接入网设备101为S-BBU，目标接入网设备102为T-BBU)、传输点(transmitting and receiving point，TRP)(例如源接入网设备101为S-TRP，目标接入网设备102为S-TRP)、发射点(transmitting point，TP)(例如源接入网设备101为S-TP，目标接入网设备102为S-TP)、移动交换中心(例如源接入网设备101为移动交换中心1，目标接入网设备102为移动交换中心3)等。
可选的，上述第一终端设备103是一种具有无线收发功能的设备，例如终端或者可用于终端中的芯片等。第一终端设备103可以部署在陆地上，包括室内或室外、手持或车载；也可以部署在水面上(如轮船等)；还可以部署在空中(例如飞机、气球和卫星上等)。其中，终端可以是5G网络或者未来演进的PLMN中的用户设备(user equipment，UE)、接入终端、终端单元、终端站、移动站、移动台、远方站、远程终端、移动设备、无线通信设备、终端代理或终端装置等。接入终端可以是蜂窝电话、无绳电话、会话启动协议(session initiation protocol，SIP)电话、无线本地环路(wireless local loop，WLL)站、个人数字处理(personal digital assistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备或可穿戴设备，虚拟现实(virtual reality，VR)终端设备、增强现实(augmented reality，AR)终端设备、工业控制(industrial control)中的无线终端、无人驾驶(self driving)中的无线终端、远程医疗(remote medical)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端等。终端可以是移动的，也可以是固定的。
如图1b所示，为本申请实施例适用的另一种通信系统10b，该通信系统10b除了可以包括图1a中的源接入网设备101、目标接入网设备102、和第一终端设备103外，还可以包括第一网络设备201和第一会话管理网元202。
一种可能的实现方式中：
第一网络设备201，用于接收第一消息，该第一消息包括第一标识，该第一标识用于标识第一组播业务，该第一消息用于目标接入网设备102请求建立第一组播业务对应的第一组播会话；当目标接入网设备102位于第一组播业务的服务范围内时，第一网络设备201，还用于建立第一组播业务对应的第一组播会话。
另一种可能的实现方式中：
第一网络设备201，用于接收目标接入网设备102的信息和第一标识，该第一标识用于标识第一组播业务；第一网络设备201，还用于根据目标接入网102的信息和第一标识，确定目标接入网设备102未建立第一组播业务对应的组播会话；第一网络设备201，还用于发送第三消息，该第三消息用于请求目标接入网设备102建立第一组播业务对应的第一组播会话。
第一会话管理网元202，用于接收第一指示信息和第一标识信息，该第一指示信息用于指示第一终端设备103移动至目标接入网设备102，该第一标识信息为第一标识或第一PDU会话的标识，该第一标识用于标识第一组播业务，第一PDU会话为第一终端设备103加入第一组播业务时使用的PDU会话。
第一会话管理网元202，还用于根据该第一指示信息，向第一网络设备201发送目标接入网设备102的信息和第一标识。
又一种可能的实现方式中：
第一会话管理网元202，用于接收第一指示信息和第一标识信息，该第一指示信息用于指示第一终端设备103移动至目标接入网设备102，该第一标识信息为第一标识或第一PDU会话的标识，该第一标识用于标识第一组播业务，第一PDU会话为第一终端设备103加入第一组播业务时使用的PDU会话；第一会话管理网元202，还用于根据目标接入网设备102的信息和第一标识信息，确定目标接入网设备102未建立第一组播业务对应的组播会话；
第一会话管理网元202，还用于向目标接入网设备102发送第五消息，该第五消息用于请求目标接入网设备102建立第一组播业务对应的第一组播会话。
基于本申请实施例提供的该通信系统，可以在目标接入网设备上建立第一组播业务对应的第一组播会话，进而建立第一组播业务的数据由第一组播业务的源设备(例如，内容提供商(content provide，CP))到目标接入网设备的传输路径，从而保证第一组播业务的连续性。
可选的，第一网络设备201除了具备上述功能，还可以用于移动网络中的会话管理，例如会话的建立、修改、释放等。在第五代(5th generation，5G)通信系统中，第一网络设备201所对应的网元或者实体可以为5G网络架构中的会话管理功能(session management function，SMF)网元，或者组播控制功能(multicast control function，MCF)网元，或者专门负责组播业务管理和控制的组播会话管理功能网元(multicast session management function，M-SMF)。其中，MCF网元可以集成到策略控制功能网元(policy control function，PCF)网元中。在未来通信如第六代通信(the6th generation，6G)通信系统中，第一网络设备201仍可以是SMF网元，或MCF网元，或M-SMF网元，或者第一网络设备201有其它名称，本申请实施例对此不作限定。
可选的，第一会话管理网元202除了具备上述功能，还可以用于移动网络中的会话管理，例如会话的建立、修改、释放等。在第五代(5th generation，5G)通信系统中，第一网络设备201所对应的网元或者实体可以为5G网络架构中的会话管理功能(session management function，SMF)网元。在未来通信如第六代通信(the 6th  generation，6G)通信系统中，第一会话管理网元202仍可以是SMF网元，或者第一会话管理网元202可以有其它名称，本申请实施例对此不作限定。
如图1c所示，为本申请实施例适用的又一种通信系统10c，该通信系统10c除了可以包括图1a中的源接入网设备101、目标接入网设备102、和第一终端设备103，图1b中的第一网络设备201和第一会话管理网元202，还可以包括第二网络设备301、第三网络设备302、策略控制网元303、应用功能网元304、组播用户面网元305等。
第二网络设备301，主要用于分组路由和转发，用户面数据的服务质量(quality of service，QoS)处理等。在第五代(5th generation，5G)通信系统中，第二网络设备301所对应的网元或者实体可以为5G网络架构中的用户平面功能(user plane function，UPF)网元，或者组播用户平面功能(multicast user plane function，M-UPF)网元，或者组播用户面功能(multicast user plane function，MUF)网元。在未来通信如第六代通信(the 6th generation，6G)通信系统中，第二网络设备301仍可以是UPF网元、或者M-UPF网元、或者MUF网元，或者第二网络设备301可以有其它名称，本申请实施例对此不作限定。
第三网络设备302，用于移动网络中的移动性管理，如用户位置更新、用户注册网络、用户切换等。在第五代(5th generation，5G)通信系统中，第三网络设备302所对应的网元或者实体可以为5G网络架构中的接入与移动性管理功能(access and mobility management function，AMF)网元，或者专门负责组播业务的组播接入与移动性管理功能(multicast access and mobility management function，M-AMF)网元。在未来通信如第六代通信(the 6th generation，6G)通信系统中，第三网络设备302仍可以是AMF网元或M-AMF网元，或者第三网络设备302有其它名称，本申请实施例对此不作限定。
策略控制网元303，用于策略控制和计费规则管理等。在第五代(5th generation，5G)通信系统中，策略控制网元303所对应的网元或者实体可以为5G网络架构中的策略控制功能(policy control function，PCF)网元，或专门负责组播业务的组播策略控制功能(multicast policy control function，M-PCF)网元，在未来通信如第六代通信(the 6th generation，6G)通信系统中，策略控制网元303仍可以是PCF网元，或者策略控制网元303有其它名称，本申请实施例对此不作限定。
应用功能网元304，主要用于向3GPP网络提供应用层信息。在本申请实施例中，应用功能网元304也可以称为内容提供商(content provide，CP)。在5G通信系统中，应用功能网元304可以是应用功能(application function，AF)网元，在未来通信如6G通信系统中，应用功能网元304仍可以是AF网元，或者有其它名称，本申请实施例对此不作限定。示例性的，AF网元例如可以包括业务能力服务器(services capability server，SCS)或者应用服务器(application server，AS)。
组播用户面网元305，用于传递组播报文，即将从应用功能网元304接收到的组播报文发送给下行节点第二网络设备301。在第五代(5th generation，5G)通信系统中，组播用户面网元305所对应的网元或者实体可以为5G网络架构中的UPF网元或者MUF网元，在未来通信如第六代通信(the 6th generation，6G)通信系统中，组播用户面网元305仍可以是UPF网元或者MUF网元，或者组播用户面网元305有其它 名称，本申请实施例对此不作限定。
此外，如图2a所示，以5G通信系统为例，为本申请实施例适用的一种具体可能的网络架构示意图，包括上述第一终端设备、源接入网设备和目标接入网设备(图2a中统一用gNB表示)、SMF网元、AMF网元、PCF网元、AF网元和UPF网元，其中，AF网元可以和PCF网元直接通信，或者也可以通过网络开放功能(network exposure function，NEF)网元(图2a中未示出)与PCF网元通信。可选的，该网络架构中还可以包括MCF网元和UPF网元，MCF网元可以与AF网元和PCF网元接口，MUF网元与AF网元和M-UPF网元接口，以便传输组播报文，MCF网元还可以和MUF网元接口。
如图2b所示，以5G通信系统为例，为申请实施例适用的另一种具体可能的网络架构示意图，包括上述第一终端设备、源接入网设备和目标接入网设备(图2b中统一用gNB表示)、AMF网元、SMF网元、UPF网元、M-AMF网元、M-SMF网元、PCF网元、M-UPF网元、和AF网元，其中，AF网元可以和PCF网元直接通信，或者也可以通过网络开放功能(network exposure function，NEF)网元(图2b中未示出)与PCF网元通信。可选的，该网络架构中还可以包括MCF网元和MUF网元，MCF网元可以与AF网元和PCF网元接口，MUF网元与AF网元和M-UPF网元接口，以便传输组播报文，MCF网元还可以和MUF网元接口。其中，UPF网元仅负责第一终端设备单播业务的数据传递，组播业务经过AP、MUF网元、M-UPF网元、gNB发送给第一终端设备，PCF网元根据MCF网元获取的组播业务描述进行组播业务QoS的制定等，M-AMF网元和M-SMF网元用于创建、管理组播会话，SMF网元与PCF网元接口(或与MCF网元接口，图2b中未示出)获取组播业务的信息，以便将第一终端设备加入组播组。
如图2c所示，以5G通信系统为例，为本申请实施例适用的又一种具体可能的网络架构示意图，包括上述第一终端设备、源接入网设备和目标接入网设备(图2c中统一用gNB表示)、AMF网元、SMF网元、M-AMF网元、PCF网元、MCF网元、MUF网元和AF网元等，可选的，还可以包括M-SMF网元和M-UPF网元。其中，AF网元与PCF网元接口(或与网络开放功能(network exposure function，NEF)网元接口，图2c中未示出)，以便将组播业务信息发送给PCF网元。若AF网元与NEF网元接口，则AF网元先将组播业务信息发送给NEF网元，再由NEF网元发送给PCF。
可以理解的是,上述网元或功能既可以是硬件设备中的网络元件，也可以是在专用硬件上运行软件功能，或者是平台(例如，云平台)上实例化的虚拟化功能。上述网元或功能可划分出一个或多个服务，进一步，还可能会出现独立于网络功能存在的服务。在本申请中，上述功能的实例、或上述功能中包括的服务的实例、或独立于网络功能存在的服务实例均可称为服务实例。
例如，上述网元或功能可以通过图3中的通信设备来实现。图3所示为本申请实施例提供的通信设备的硬件结构示意图。该通信设备300包括处理器301，通信线路302，存储器303以及至少一个通信接口(图3中仅是示例性的以包括通信接口304为例进行说明)。
处理器301可以是一个通用中央处理器(central processing unit，CPU)，微处理 器，特定应用集成电路(application-specific integrated circuit，ASIC)，或一个或多个用于控制本申请方案程序执行的集成电路。
通信线路302可包括一通路，在上述组件之间传送信息。
通信接口304，使用任何收发器一类的装置，用于与其他设备或通信网络通信，如以太网，无线接入网(radio access network，RAN)，无线局域网(wireless local area networks，WLAN)等。
存储器303可以是只读存储器(read-only memory，ROM)或可存储静态信息和指令的其他类型的静态存储设备，随机存取存储器(random access memory，RAM)或者可存储信息和指令的其他类型的动态存储设备，也可以是电可擦可编程只读存储器(electrically erasable programmable read-only memory，EEPROM)、只读光盘(compact disc read-only memory，CD-ROM)或其他光盘存储、光碟存储(包括压缩光碟、激光碟、光碟、数字通用光碟、蓝光光碟等)、磁盘存储介质或者其他磁存储设备、或者能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质，但不限于此。存储器可以是独立存在，通过通信线路302与处理器相连接。存储器也可以和处理器集成在一起。
其中，存储器303用于存储执行本申请方案的计算机执行指令，并由处理器301来控制执行。处理器301用于执行存储器303中存储的计算机执行指令，从而实现本申请下述实施例提供的通信方法。
可选的，本申请实施例中的计算机执行指令也可以称之为应用程序代码，本申请实施例对此不作具体限定。
在具体实现中，作为一种实施例，处理器301可以包括一个或多个CPU，例如图3中的CPU0和CPU1。
在具体实现中，作为一种实施例，通信设备300可以包括多个处理器，例如图3中的处理器301和处理器308。这些处理器中的每一个可以是一个单核(single-CPU)处理器，也可以是一个多核(multi-CPU)处理器。这里的处理器可以指一个或多个设备、电路、和/或用于处理数据(例如计算机程序指令)的处理核。
在具体实现中，作为一种实施例，通信设备300还可以包括输出设备305和输入设备306。输出设备305和处理器301通信，可以以多种方式来显示信息。例如，输出设备305可以是液晶显示器(liquid crystal display，LCD)，发光二级管(light emitting diode，LED)显示设备，阴极射线管(cathode ray tube，CRT)显示设备，或投影仪(projector)等。输入设备306和处理器301通信，可以以多种方式接收用户的输入。例如，输入设备306可以是鼠标、键盘、触摸屏设备或传感设备等。
上述的通信设备300可以是一个通用设备或者是一个专用设备。在具体实现中，通信设备300可以是台式机、便携式电脑、网络服务器、掌上电脑(personal digital assistant，PDA)、移动手机、平板电脑、无线终端设备、嵌入式设备或有图3中类似结构的设备。本申请实施例不限定通信设备300的类型。
下面将结合图1a至图3对本申请实施例提供的通信方法进行具体阐述。
需要说明的是，本申请实施例并不限定于图2a或图2b或图2c所示的5G网络架构，还可以应用于未来其它的通信系统，例如6G网络架构等。并且，本申请实施例 所使用的各个网元的名称，在未来通信系统中，可能保持功能相同，但名称会改变。
需要说明的是，本申请下述实施例可以适用于第一终端设备从源接入网设备移动至目标接入网设备的场景，但不应对本申请构成任何限定，可以理解的是，本申请还可能适用于其他场景。
首先，从本申请实施例涉及的各个网元侧对本申请提供的通信方法进行介绍。
如图4所示，为本申请实施例提供的一种通信方法，该通信方法包括如下步骤：
S401、目标接入网设备接收来自源接入网设备的第一标识。
其中，第一标识用于标识第一组播业务。第一组播业务可以为第一终端设备在移动前加入的组播业务，或者说第一组播业务为在第一终端设备移动前通过源接入网设备接收的业务，又或者说第一组播业务为第一终端设备当前进行的业务。
其中，第一组播业务可以为多媒体广播多播业务(multimedia broadcast multicast service，MBMS)，例如视频直播业务，或者，第一组播业务也可以为其他业务，例如车联网(vehicle to everything，V2X)或物联网(Internet of thing，IoT)的数据传输业务，或者是公共安全(Public Safety)相关的数据传输业务等，本申请实施例对此不做具体限定。
S402、目标接入网设备确定第一组播业务的数据在目标接入网设备和第一终端设备之间的传输方式。
其中，该传输方式包括单播方式或组播方式。
可选的，目标接入网设备可以采用以下多种方式确定第一组播业务的数据在目标接入网设备和第一终端设备之间的传输方式：
一种可能的实现方式中，目标接入网设备可以根据第一数量确定第一组播业务的数据在目标接入网设备和第一终端设备之间的传输方式，其中，第一数量为通过目标接入网设备接收第一组播业务的数据的终端设备的数量。
示例性的，当第一数量小于第一阈值时，说明通过目标接入网设备接收第一组播业务的终端设备较少，为了提高第一终端设备的接收质量，目标接入网设备可以确定该传输方式为单播方式；当第一数量大于第一阈值时，说明通过目标接入网设备接收第一组播业务的终端设备较多，为了降低传输开销，目标接入网设备可以确定该传输方式为组播方式，当第一数量等于第一阈值时，目标接入网设备可以确定该传输方式为单播方式或组播方式。
需要说明的是，若目标接入网设备在接收到第一标识前，创建了第一组播业务的上下文，则通过目标接入网设备接收第一组播业务的数据的终端设备包括在第一终端设备切换至目标接入网设备之前，通过目标接入网设备接收第一组播业务的数据的终端设备，此外，通过目标接入网设备接收第一组播业务的数据的终端设备还可以包括请求切换至目标接入网设备且加入了第一组播业务的终端设备。
另一种可能的实现方式中，目标接入网设备可以接收来自源接入网设备的目标小区的信号测量信息，该目标小区属于目标接入网设备，此时，目标接入网设备确定上述传输方式，可以为：目标接入网设备根据目标小区的信号测量信息确定该传输方式。
示例性的，目标小区的信号测量信息可以包括第一终端设备与目标小区之间的信号强度信息，当该信号强度信息指示的信号强度大于第二阈值时，说明第一终端设备 与目标小区之间的信号强度较强，此时采用组播传输方式不会增加额外的开销，目标接入网设备可以确定该传输方式为组播方式；当该信号强度信息指示的信号强度小于第二阈值时，说明第一终端设备与目标小区之间的信号强度较弱，为了提高第一终端设备的接收质量，以及为了避免目标接入网设备以组播方式发送第一组播业务的数据时，按照第一终端设备的信号强度调整发送第一组播业务的数据的信号强度，导致功率过高，从而增加功耗，目标接入网设备可以确定该传输方式为单播方式。
再一种可能的实现方式中，目标接入网设备可以根据第一数量和目标小区的信号测量信息确定上述传输方式。例如，当第一数量大于第一阈值，并且第一终端设备与目标小区间的信号强度大于第二阈值时，目标接入设备可以确定该传输方式为组播方式，否则，目标接入网设备确定该传输方式为单播方式。
又一种可能的实现方式中，目标接入网设备可以根据第二数量和目标小区的信号测量信息确定上述传输方式，其中，第二数量为通过目标接入网设备接收第一组播业务的数据的终端设备中，与目标小区之间的信号强度大于第二阈值的终端设备的数量。例如，当第二数量大于第一阈值，且第一终端设备与目标小区间的信号强度大于第二阈值时，目标接入设备可以确定该传输方式为组播方式，否则，目标接入网设备确定该传输方式为单播方式。
可选的，上述第一阈值和/或第二阈值可以是目标接入网设备确定的，也可以是协议规定的，本申请实施例对此不做具体限定。当第一阈值和/或第二阈值由目标接入网设备确定时，该第一阈值和/或第二阈值可能根据目标接入网设备的负载等情况进行变化。
可选的，目标接入网设备确定的第一组播业务的数据在目标接入网设备和第一终端设备之间的传输方式，和第一组播业务的数据在目标接入网设备和第二端终设备之间的传输方式可以相同，也可以不同。其中，第二终端设备为通过目标接入网设备接收第一组播业务的数据的除第一终端设备之外的一个或多个终端设备。
基于该方案，目标接入网设备可以根据目标小区的信号测量信息和/或通过所述目标接入网设备接收所述第一组播业务的数据的终端设备的数量，合理灵活地确定第一组播业务的数据在目标接入网设备和第一终端设备之间的传输方式，从而降低传输开销，或者提高第一终端设备的接收质量。
S403、目标接入网设备通过源接入网设备向第一终端设备发送，第一组播业务的数据在目标接入网设备和第一终端设备之间的传输方式对应的无线配置信息。
可选的，该传输方式对应的无线配置信息可以包括以下一项或多项：无线链路控制(radio link control，RLC)层配置信息、媒体接入控制(media access control，MAC)层配置信息、分组数据汇聚协议(packet data convergence protocol，PDCP)层配置信息、数据无线承载标识(data radio bearer identifier，DRB ID)。
可选的，RLC层配置信息可以配置第一终端设备用于接收该第一组播业务的RLC层协议，例如，确定RLC所使用的传输模式(确认模式或非确认模式)；MAC层配置信息可以配置第一终端设备用于接收该第一组播业务的MAC层协议，例如配置DRB对应的逻辑信道的标识(logic channel identifier，LC ID)；PDCP层配置信息可以配置第一终端设备用于接收该第一组播业务的PDCP层协议，如是否支持头压缩等。
可选的，当该传输方式为组播方式时，该无线配置信息除包括上述一项或多项外，还包括调度指示信息，该调度指示信息用于确定第一组播业务的调度信息，该调度信息用于指示传输第一组播业务的无线资源。基于该方案，后续可以使第一终端设备根据该调度指示信息确定传输第一组播业务的无线资源，并在该无线资源上接收第一组播业务的数据。
可选的，该调度指示信息例如可以是组播无线网络临时标识(group radio network temporary identifier，G-RNTI)，或者可以是类似于G-RNTI的标识。
可选的，在步骤S403之前，目标接入网设备可以接收来自源接入网设备的第一组播业务的(quality of service，QoS)流的信息，并根据第一组播业务的QoS流的信息，获得该传输方式对应的无线配置信息。
示例性的，第一组播业务的QoS流的信息可以包括一个或多个服务质量流标识(QoS flow identifier，QFI)和每个QFI所对应的QoS参数(如5QI，带宽需求等)，其中，一个QFI用于标识一个QoS流。目标接入网设备可以根据每个QFI所对应的QoS参数确定QFI到DRB之间的映射并创建该DRB，以及根据每个QFI所对应的QoS参数确定传输该第一组播业务的QoS流所需要的DRB的数量，目标接入网设备还可根据每个DRB所映射的QFI所对应的QoS参数确定该DRB对应的配置参数，例如，该DRB所对应的RLC层采用确认模式还是非确认模式等。
可选的，若在步骤S402中确定目标接入网设备已经创建了第一组播业务的上下文，该第一组播业务的上下文中可以包括该传输方式对应的无线配置信息，则目标接入网设备可以从第一组播业务的上下文中获取该传输方式对应的无线配置信息，并通过源接入网设备发送至第一终端设备。
需要说明的是，在目标接入网设备根据第一组播业务的QoS流的信息，获得该传输方式对应的无线配置信息时，由于无线资源有限，可能无法为每个QoS流创建相应的DRB，从而出现第一组播业务的部分QoS流无法通过目标接入网设备传输。本申请实施例中，将成功创建了DRB的QoS流称为切换成功的QoS流，将未成功创建DRB的QoS流称为切换失败的QoS流，在此统一说明，下述实施例中不再赘述。
本申请实施例提供的通信方法，在第一终端设备从源接入网设备移动至目标接入网设备之前，目标接入网设备能够确定第一组播业务的数据在目标接入网设备和第一终端设备之间的传输方式，并向源接入网设备发送传输方式对应的无线配置信息，进而，使源接入网设备可以将该无线配置信息发送给第一终端设备。后续在第一终端设备移动至目标接入网设备或切换至目标接入网设备时，可以无需等待目标接入网设备下发配置信息，而根据切换前目标接入网设备通过源接入网设备发送的该无线配置信息进行配置。也就是说，基于本申请实施例提供的通信方法，可以在第一终端设备发生移动或切换前，将传输组播业务时使用的无线配置信息发送给第一终端设备，以使第一终端设备进行配置，从而降低由第一终端设备跨接入网设备切换引起的组播业务的时延。
其中，上述方案的具体实现将通过图10或图11或图12或图13或图14所示的网元之间的交互流程进行详细阐述，相关的步骤以及术语等可以相互借鉴，在此不再赘述。
如图5所示，为本申请实施例提供的另一种通信方法，该通信方法包括如下步骤：
S501、源接入网设备向目标接入网设备发送第一标识。
其中，第一标识用于标识第一组播业务，第一组播业务的相关描述可参考上述步骤S401，在此不再赘述。
可选的，源接入网设备可以从第一终端设备的上下文中获取第一标识。
S502、源接入网设备接收来自目标接入网设备的无线配置信息。
其中，该无线配置信息与第一组播业务的数据在目标接入网设备和第一终端设备之间的传输方式对应，该传输方式包括单播方式或组播方式，该无线配置信息的相关描述可参考上述步骤S403，在此不再赘述。
S503、源接入网设备向第一终端设备发送该无线配置信息。
可选的，在图5所示的实施例的一种实施场景下，该通信方法还包括：源接入网设备向目标接入网设备发送目标小区的测量信息，以使目标接入网设备根据该目标小区的信号测量信息确定第一组播业务的数据。
可选的，在图5所示的实施例的另一种实施场景下，该通信方法还包括：源接入网设备向目标接入网设备发送第一组播业务的QoS流的信息。
其中，第一组播业务的QoS流的信息可以包含在第二组播会话的上下文中，第二组播会话为源接入网设备所建立的第一组播业务对应的组播会话。从而，源接入网设备可以根据第一标识，获取第二组播会话的上下文，或者根据第二组播会话的标识，获取第二组播会话的上下文，进而获取第一组播业务的QoS流的信息。
可选的，第二组播会话的标识可以是源接入网设备从第一终端设备的上下文中获取的。
其中，上述方案的具体实现将通过图10或图11或图12或图13或图14所示的网元之间的交互流程进行详细阐述，相关的步骤以及术语等可以相互借鉴，在此不再赘述。
如图6所示，为本申请实施例提供的又一种通信方法，该通信方法包括如下步骤：
S601、第一网络设备接收第一消息。
其中，第一消息包括第一标识，第一标识用于标识第一组播业务，该第一消息用于目标接入网设备请求建立第一组播业务对应的第一组播会话。
可选的，该第一消息例如可以是扩展的现有消息(例如，路径切换请求传输(Path Switch Request Transfer)消息)，也可以是新定义的消息。本申请实施例对此不做具体限定。
S602、第一网络设备建立第一组播业务对应的第一组播会话。
其中，当目标接入网设备位于第一组播业务的服务范围内时，第一网络设备建立第一组播业务对应的第一组播会话。
可选的，目标接入网设备位于第一组播业务的服务范围内，可以理解为目标接入网设备的服务范围位于第一组播业务的服务范围内，或者说第一组播业务的服务范围包括目标接入网设备的服务范围；或者，也可以理解为目标接入网设备的服务范围与第一组播业务的服务范围存在交集。
其中，第一网络设备建立第一组播业务对应的第一组播会话的具体实现，将在后 续实施例中以网元之间的交互进行详细阐述，在此不再赘述。
基于该方案，可以在目标接入网设备上建立第一组播业务对应的第一组播会话，进而建立第一组播业务的数据由第一组播业务的提供者(例如，AF网元)到目标接入网设备的传输路径，从而保证第一组播业务的连续性，进一步降低由第一终端设备跨接入网设备切换引起的组播业务的时延。
其中，上述方案的具体实现将通过图10或图11或图12或图13或图14所示的网元之间的交互流程进行详细阐述，相关的步骤以及术语等可以相互借鉴，在此不再赘述。
如图7所示，为本申请实施例提供的又一种通信方法，该通信方法包括如下步骤：
S701、第一网络设备接收目标接入网设备的信息和第一标识。
可选的，目标接入网设备的信息可以包括以下一项或多项：目标接入网设备的标识、第一小区的标识、跟踪区标识(tracking area identity，TAI)。其中，第一小区属于目标接入网设备，第一小区可以是目标小区，也可以是除目标小区之外的属于目标接入网设备的小区。跟踪区标识为目标接入网设备所支持的跟踪区标识。
需要说明的是，由于第一终端设备可以切换到目标接入网设备，因此，在第一终端设备与目标接入网设备进行切换流程或成功切换至目标接入网设备时，目标接入网设备的信息也可以理解为第一终端设备的位置信息，从而，在本申请实施例中，目标接入网设备的信息和第一终端设备的位置信息可以相互替换，在此统一说明，下述实施例不再赘述。
需要说明的是，本申请实施例中，终端设备的位置信息可以包括以下一项或多项：终端设备成功接入或正在尝试接入的小区的标识、终端设备成功接入或正在尝试接入的小区所属的接入网设备的标识、终端设备成功接入或正在尝试接入的小区所属的接入网设备所支持的跟踪区标识。
S702、第一网络设备根据目标接入网设备的信息和第一标识，确定目标接入网设备未建立第一组播业务对应的组播会话。
需要说明的是，本申请实施例中，目标接入网设备未建立第一组播业务对应的组播会话，也可以理解为目标接入网设备上不存在第一组播业务对应的组播会话，在此统一说明，下述实施例不再赘述。
可选的，第一网络设备可以根据目标接入网设备的信息和第一标识，通过多种方式确定目标接入网设备未建立第一组播业务对应的组播会话：
一种可能的实现方式中，第一网络设备可以存储已经建立的组播会话的信息，其中，组播会话的信息可以包括组播会话的标识、组播会话对应的接入网设备的信息、组播会话对应的组播业务的标识。
在该实现方式中，第一网络设备在接收到目标接入网设备的信息和第一标识后，查询已经建立的组播会话的信息，若存在一个组播会话同时对应目标接入网设备的信息和第一标识，即组播会话对应的组播业务的标识和第一标识相同，且该组播会话对应的接入网设备的信息包括目标接入网的信息，则第一网络设备确定目标接入网设备已经建立了第一组播业务对应的组播会话，否则，第一网络设备确定目标接入网设备未建立第一组播业务对应的组播会话。本申请实施例中以第一网络设备确定目标接入 网设备未建立第一组播业务对应的组播会话为例进行说明。
另一种可能的实现方式中，第一网络设备可以向存储了已经建立的组播会话的信息的网元(例如统一数据管理(unified data management，UDM)网元，或PCF网元，或统一数据存储(unified data repository，UDR)网元，本申请实施例以UDM网元为例)，发送查询消息，在该查询消息中携带目标接入网设备的信息和第一标识，以查询目标接入网设备建立的第一组播业务对应的组播会话。若UDM网元返回的响应消息中包括目标接入网设备建立的第一组播业务对应的组播会话的信息，或者，UDM网元返回的响应消息指示目标接入网设备已经建立第一组播业务对应的组播会话，则第一网络设备确定目标接入网设备已经建立了第一组播业务对应的组播会话；若UDM网元返回的响应消息指示未找到目标接入网设备建立的组播会话，或者UDM网元返回的响应消息指示目标接入网设备未建立第一组播业务对应的组播会话，则第一网络设备确定目标接入网设备未建立了第一组播业务对应的组播会话。本申请实施例中以第一网络设备确定目标接入网设备未建立第一组播业务对应的组播会话为例进行说明。
可选的，该存储了已经建立的组播会话的信息的网元也可以称为用于注册已经建立的组播会话的网元。
S703、第一网络设备发送第三消息。
其中，第三消息用于请求目标接入网设备建立第一组播业务对应的第一组播会话。
基于该方案，可以在目标接入网设备上建立第一组播业务对应的第一组播会话，进而建立第一组播业务的数据由第一组播业务的提供者(例如，AF网元)到目标接入网设备的传输路径，从而保证第一组播业务的连续性，进一步降低由第一终端设备跨接入网设备切换引起的组播业务的时延。
其中，上述方案的具体实现将通过图10或图11或图12或图13或图14所示的网元之间的交互流程进行详细阐述，相关的步骤以及术语等可以相互借鉴，在此不再赘述。
如图8所示，为本申请实施例提供的又一种通信方法，该通信方法包括如下步骤：
S801、第一会话管理网元接收第一指示信息和第一标识信息。
其中，第一指示信息用于指示第一终端设备移动至目标接入网设备。
可选的，第一终端设备移动至目标接入网设备，可以理解为第一终端设备已经切换到或移动到目标接入网设备(即，已经可以通过目标接入网设备发送和接收数据)；或者，也可以理解为第一终端设备正在尝试接入目标接入网设备，但还未成功接入，例如，处于切换流程的准备阶段，本申请实施例对此不做具体限定。
可选的，第一指示信息可以是目标接入网设备通过移动性管理网元向第一会话管理网元发送的，或者，也可以是移动性管理网元在收到目标接入网设备的消息(例如，路径切换请求消息)或收到源接入网设备的消息(例如，切换请求(handover required)消息)后向第一会话管理网元发送的。
可选的，第一指示信息可以包括目标接入网设备的信息和用于指示第一终端设备发生移动(或切换)的信息。
其中，第一标识信息为第一标识或第一协议数据单元(protocol data unit，PDU)会话的标识，第一标识用于标识第一组播业务，第一PDU会话为第一终端设备加入第 一组播业务时所使用的PDU会话。
可选的，第一标识是目标接入网设备通过移动管理网元向第一会话管理网元发送的。
可选的，第一PDU会话的标识，可以是目标接入网设备通过移动性管理网元向第一会话管理网元发送的，此时，第一PDU会话的标识为PDU会话标识(PDU Session ID)；或者，也可以是移动性管理网元在收到目标接入网设备的消息(例如，路径切换请求消息)或收到源接入网设备的消息(例如，切换请求(handover required)消息)后向第一会话管理网元发送的，此时，第一PDU会话的标识为第一会话管理网元为该第一PDU会话分配的上下文标识(即该第一PDU会话在该第一会话管理网元中的统一资源标识(uniform resource identifier，URI))。
S802、第一会话管理网元根据第一指示信息，向第一网络设备发送目标接入网设备的信息和第一标识。
可选的，第一会话管理网元根据第一指示信息，向第一网络设备发送目标接入网设备的信息和第一标识，可以理解为第一指示信息为第一会话管理网元向第一网络设备发送目标接入网设备的信息和第一标识的触发条件。具体的，第一会话管理网元接收到第一指示信息和第一标识信息后，可以确定第一终端设备移动至目标接入网设备，且第一终端设备加入了第一组播业务，进而确定第一终端设备需要通过目标接入网设备接收第一组播业务的数据，由于接收第一组播业务的数据需要存在第一组播业务对应的组播会话，然而，第一会话管理网元可能不具备组播会话管理功能，因此，第一会话管理网元向第一网络设备发送目标接入网设备的信息和第一标识，以使第一网络设备进行第一组播业务对应的组播会话的建立等相关处理。
可选的，第一会话管理网元可以将目标接入网设备的信息和第一标识携带在通知消息中发送给第一网络设备，该通知消息用于通知第一网络设备存在终端设备通过目标接入网设备接收第一组播业务的数据，以使第一网络设备进行后续处理，例如，建立第一组播业务对应的组播会话。或者，第一会话管理网元可以向第一网络设备发送请求消息，该请求消息中携带目标接入网设备的信息和第一标识，该请求消息用于请求第一网络设备将在目标接入网设备上为该第一标识对应的第一组播业务建立的组播会话的信息发送给第一会话管理网元，本实施例对此不作限定。
基于该方案，由于第一会话管理网元向第一网络设备发送目标接入网设备的信息和第一标识，因此可以使第一网络设备在目标接入网设备上建立第一组播业务对应的第一组播会话，进而建立第一组播业务的数据由第一组播业务的提供者(例如，AF网元)到目标接入网设备的传输路径，从而保证第一组播业务的连续性，进一步降低由第一终端设备跨接入网设备切换引起的组播业务的时延。
其中，上述方案的具体实现将通过图10或图11或图12或图13或图14所示的网元之间的交互流程进行详细阐述，相关的步骤以及术语等可以相互借鉴，在此不再赘述。
如图9所示，为本申请实施例提供的又一种通信方法，该通信方法包括如下步骤：
S901、第一会话管理网元接收第一指示信息和第一标识信息。
其中，相关描述可参考上述步骤S801，在此不再赘述。
S902、第一会话管理网元根据目标接入网设备的信息和第一标识信息，确定目标接入网设备未建立第一组播业务对应的组播会话。
其中，步骤S902的详细实现方式类似于上述步骤S702中提供的第二种方式，即第一会话管理网元向存储了已经建立的组播会话的信息的网元发送查询消息，以查询目标接入网设备建立的第一组播业务对应的组播会话，相关描述可参考步骤S702，在此不再赘述。
S903、第一会话管理网元向目标接入网设备发送第五消息。
其中，第五消息用于请求目标接入网设备建立第一组播业务对应的第一组播会话。
基于该方案，第一会话管理网元可以在目标接入网设备上建立第一组播业务对应的第一组播会话，进而建立第一组播业务的数据由第一组播业务的提供者(例如，AF网元)到目标接入网设备的传输路径，从而保证第一组播业务的连续性，进一步降低由第一终端设备跨接入网设备切换引起的组播业务的时延。
其中，上述方案的具体实现将通过图10或图11或图12或图13或图14所示的网元之间的交互流程进行详细阐述，相关的步骤以及术语等可以相互借鉴，在此不再赘述。
上述方法实施例从各个网元侧对本申请提供的通信方法进行介绍，下面以网元之间交互的方式对本申请提供的通信方法进行详细阐述。
以图1a或图1b或图1c所示的通信系统应用于如图2a或图2b或图2c所示的5G网络，第一会话管理网元为SMF网元，第一网络设备为MCF网元，第二网络设备为M-UPF网元为例，如图10所示，为本申请实施例提供的一种通信方法，该通信方法包括如下步骤：
S1001、第一终端设备向源接入网设备发送邻区测量报告。相应的，源接入网设备接收来自第一终端设备的邻区测量报告。
其中，邻区测量报告包括源小区的相邻小区的信号测量信息，源小区为第一终端设备与源接入网设备连接时第一终端设备的服务小区，源小区属于源接入网设备。本申请实施例中，以源小区的相邻小区包括属于目标接入网设备的目标小区为例进行说明。
可选的，第一终端设备在与源接入网设备连接时，会对源小区的相邻小区进行信号测量，并向源接入网设备上报邻区测量报告。源接入网设备接收到第一终端设备上报的邻区测量报告后，根据该邻区测量报告确定是否将第一终端设从源小区切换到相邻小区。
需要说明的是，本申请实施例中，以源接入网设备确定将第一终端设备切换至目标小区，目标小区属于目标接入网设备为例进行说明。其中，第一终端设备切换至目标小区，也可以理解为第一终端设备切换至目标接入网设备，二者可以相互替换，本申请实施例对此不做具体限定。
S1002、源接入网设备向目标接入网设备发送切换请求消息。相应的，目标接入网设备接收来自源接入网设备的切换请求消息。
其中，该切换请求消息中包括第一标识，第一标识用于标识第一组播业务，相关描述可参考上述步骤S401和步骤S501，在此不再赘述。
S1003、目标接入网设备确定传输方式。
其中，该传输方式为第一组播业务的数据在目标接入网设备和第一终端设备之间的传输方式，相关描述可参考上述步骤S402，在此不再赘述。
可选的，源接入网设备可以向目标接入网设备发送目标小区的信号测量信息，以便目标接入网设备可以根据目标小区的信号测量信息确定该传输方式，相关描述可参考上述步骤S403，在此不再赘述。
可选的，源接入网设备可以通过步骤S1002中的切换请求消息向目标接入网设备发送目标小区的信号测量信息，也可以通过除切换请求消息之外的其他消息向目标接入网设备发送目标小区的信号测量信息，本申请实施例对此不做具体限定。
S1004、目标接入网设备向源接入网设备发送切换响应消息。相应的，源接入网设备接收来自目标接入网设备的切换响应消息。
其中，该切换响应消息包括第一组播业务的数据在目标接入网设备和第一终端设备之间的传输方式对应的无线配置信息，相关描述可参考上述步骤S403，在此不再赘述。
可选的，在步骤S1004之前，源接入网设备可以向目标接入网设备发送第一组播业务的QoS流的信息，以便目标接入网设备根据第一组播业务的QoS流的信息，获得该传输方式对应的无线配置信息，相关描述可参考上述步骤S403，在此不再赘述。
可选的，源接入网设备可以通过步骤S1002中的切换请求消息向目标接入网设备发送第一组播业务的QoS流的信息，也可以通过除切换请求消息之外的其他消息向目标接入网设备发送第一组播业务的QoS流的信息，本申请实施例对此不做具体限定。
S1005、源接入网设备向第一终端设备发送切换命令。相应的，第一终端设备接收来自源接入网设备的切换命令。
其中，该切换命令中包括源接入网设备从目标接入网设备接收的，第一组播业务的数据在目标接入网设备与第一终端设备之间的传输方式对应的无线配置信息、以及目标小区的相关信息。
可选的，第一终端设备接收到该切换命令后，尝试接入目标接入网设备，例如，与目标接入网设备进行随机接入过程，并在成功接入目标接入网设备后，根据该传输方式对应的无线配置信息进行配置，以便通过目标接入网设备接收第一组播业务的数据。
S1006、第一终端设备向目标接入网设备发送消息1。相应的，目标接入网设备接收来自第一终端设备的消息1。
可选的，第一终端设备成功接入目标接入网设备后，向目标接入网设备发送该消息1，以通知目标接入网设备切换完成。
可选的，该消息1可以是现有的切换通知消息，例如无线资源控制(radio resource control，RRC)重配置完成消息，也可以是新定义的消息，本申请实施例对此不做限定。
S1007、目标接入网设备向AMF网元发送路径切换(Path Switch)请求消息。相应的，AMF网元接收来自目标接入网设备的路径切换请求消息。
其中，AMF网元为第一终端设备注册的AMF网元。
其中，该路径切换请求消息中包括目标接入网设备发送给SMF网元的信息，SMF网元为第一PDU会话对应的会话管理网元，第一PDU会话为第一终端设备加入第一组播业务时所使用的PDU会话。
可选的，目标接入网设备发送给SMF网元的信息包括信息1，该信息1包括第一标识、第一组播业务对应的第一组播会话的标识、第一组播业务的第一QoS流的信息中的至少一项。
其中，第一组播业务对应的第一组播会话的标识可以是目标接入网设备建立第一组播业务对应的第一组播会话时分配的，目标接入网设备建立第一组播业务对应的第一组播会话的过程将在下述步骤S1010中介绍，此处不再赘述。
其中，第一组播业务的第一QoS流为第一组播业务的QoS流中的部分或全部QoS流，若第一QoS流为第一组播业务的QoS流中的部分流，则第一QoS流可以为第一组播业务的QoS流中切换成功的QoS流，或者切换失败的QoS流。
需要说明的是，本申请实施例中的信息1也可以称为第一组播业务的第三信息，二者可以相互替换，在此统一说明，下述实施例不再赘述。
S1008、AMF网元向SMF网元发送消息2。相应的，SMF网元接收来自AMF网元的消息2。
其中，该消息2中包括上述信息1。
可选的，SMF网元收到信息1后，当该信息1包括第一组播业务对应的第一组播会话的信息时，SMF网元可以保存该第一组播会话的标识，以便用于后续的会话修改、删除等。当该信息1中包括第一组播业务的切换成功和/或失败的QoS流的信息时，则保存该切换成功和/或失败的QoS流的信息，用于后续的计费等处理；当该信息1中包括第一组播业务的切换失败的QoS流的信息时，还可以将该切换失败的QoS从第一终端设备的上下文中删除，避免后续结合切换失败的QoS流进行计费。
可选的，目标接入网设备接收到第一标识后，可以在目标接入网设备存储的组播上下文中查找第一标识，若目标接入网设备存储的组播上下文中存在包括第一标识的组播上下文，则认为目标接入网设备已经创建了第一组播业务的上下文；若目标接入网设备存储的组播上下文中不存在包括第一标识的组播上下文，则认为目标接入网设备未创建(或不存在)第一组播业务的上下文，相应的，也可以认为目标接入网设备未建立第一组播业务对应的组播会话，或者说目标接入网设备不存在第一组播业务对应的组播会话，此时，本申请实施例提供的通信方法还包括如下步骤：
S1009、目标接入网设备向MCF网元发送第一消息。相应的，MCF网元接收来自目标接入网设备的第一消息。
其中，第一消息包括第一标识，第一标识用于标识第一组播业务，该第一消息用于目标接入网设备请求建立第一组播业务对应的第一组播会话，相关描述可参考上述步骤S601，在此不再赘述。
可选的，第一消息还可以包括目标接入网设备的信息，以便MCF网元根据目标接入网设备的信息，确定是否可以为目标接入网设备建立第一组播业务对应的第一组播会话。
或者，可选的，第一消息中可以不包括目标接入网设备的信息，目标接入网设备 通过AMF网元将第一消息发送给MCF网元，在AMF网元在将第一消息发送给MCF网元时，将目标接入网设备的信息发送给MCF网元。
可选的，第一消息还可以包括信息2，该信息2包括：第一组播会话的标识和第一路径信息中的至少一项。其中，第一组播会话的标识可以是目标接入网设备分配的，第一路径信息包括目标接入网设备的互联网协议(internet protocol，IP)地址和第一隧道标识，第一隧道标识用于标识目标接入网设备接收第一组播业务的数据的单播隧道。
可选的，第一消息还可以包括第一组播业务的第一QoS流的信息，第一组播业务的第一QoS流的信息的相关描述可参考上述步骤S1007，在此不再赘述。
需要说明的是，本申请实施例中的信息2也可以称为第一组播业务的第一信息，二者可以相互替换，在此统一说明，下述实施例不再赘述。
S1010、MCF网元建立第一组播业务对应的第一组播会话。
其中，MCF接收到来自目标接入网设备的第一消息后，判断目标接入网设备是否位于第一组播业务的服务范围内，当目标接入网设备位于第一组播业务的服务范围内时，第一网络设备建立第一组播业务对应的第一组播会话。
可选的，MCF网元可以从PCF网元(或UDR网元)中获取第一组播业务的策略信息，该策略信息可以包括第一组播业务的服务范围。当第一消息还包括目标接入网设备的信息时，或者，当MCF网元接收到来自AMF网元的目标接入网设备的信息时，MCF网元根据目标接入网设备的信息，确定目标接入网设备是否位于第一组播业务的服务范围内。具体的，目标接入网设备的信息可以反映目标接入网设备的服务范围，MCF网元可以将目标接入网设备的服务范围与第一组播业务的服务范围进行比较，当二者存在交集或者第一组播业务的服务范围包括目标接入网设备的服务范围时，确定目标接入网设备位于第一组播业务的服务范围内。
需要说明的是，本申请实施例中，第一组播业务的策略信息也可以称为第一组播业务的配置信息，二者可以相互替换，本申请实施例对此不做具体限定。
可选的，当第一消息还包括上述信息2，该信息2包括第一组播会话的标识时，MCF网元可以保存该第一组播会话的标识，用于后续第一组播会话的修改、删除等。当该信息2包括第一路径信息时，MCF网元执行步骤S1011，为第一组播业务的数据传输建立M-UPF网元与目标接入网设备之间的隧道。
可选的，若还未在M-UPF网元与MUF网元之间为第一组播业务的数据传输建立隧道，则MCF网元还执行步骤S1012。
S1011、MCF网元向M-UPF网元发送第一路径信息。相应的，M-UPF网元接收来自MCF网元的第一路径信息。
可选的，M-UPF网元接收到该第一路径信息后，保存该第一路径信息，后续在接收到来自MUF的第一组播业务的数据时，根据第一路径信息向目标接入网设备发送第一组播业务的数据。
S1012、MCF网元向MUF网元发送第三路径信息。相应的，MUF网元接收来自MCF网元的第三路径信息。
其中，第三路径信息包括M-UPF网元的IP地址和第三隧道标识，该第三隧道标识用于标识M-UPF网元接收第一组播业务的数据的隧道。
可选的，MUF网元接收到该第三路径信息后，保存该第三路径信息，后续在接收到来自AF网元的第一组播业务的数据时，根据第三路径信息向MUF网元发送第一组播业务的数据。
至此，第一组播业务的数据可以从AF网元经过MUF网元和M-UPF网元发送至目标接入网设备，再由目标接入网设备发送给第一终端设备。
S1013、MCF网元向目标接入网设备发送响应消息。相应的，目标接入网设备接收来自MCF网元的响应消息。
可选的，当上述步骤S1009中的第一消息不包括信息2时，该响应消息中包括信息3。该信息3包括第一组播会话的标识和第二路径信息中的至少一项。其中，第一组播会话的标识可以是MCF网元分配的，第二路径信息包括组播地址和第二隧道标识，该组播地址用于目标接入网设备通过组播方式接收第一组播业务的数据，该第二隧道标识用于标识目标接入网设备通过组播方式接收第一组播业务的数据的组播隧道。
可选的，该组播地址可以是IP组播地址，也可以是其他形式的组播地址，本申请实施例对此不做具体限定。
可选的，目标接入网设备接收信息3后，若该信息3包括第二路径信息，则保存该第二路径信息，以便后续根据该第二路径信息接收第一组播业务的数据。相应的，MCF网元还将第二路径信息发送给M-UPF网元，以便M-UPF网元根据第二路径信息向目标接入网设备发送第一组播业务的数据。
可选的，上述第二路径信息包括IP组播地址时，目标接入网设备还发送IP组播协议(IP Group Management Protocol，IGMP)加入(Jion)请求，以便加入该IP组播组，进而传输第一组播业务的数据。可选的，M-UPF网元也可以发送IGMP加入请求。
需要说明的是，本申请实施例中的信息3也可以称为第一组播业务的第二信息，二者可以相互替换，在此统一说明，下述实施例不再赘述。
需要说明的是，本申请实施例中，步骤S1003-S1008与步骤S1009-S1013之间没有严格的执行顺序，可以先执行步骤S1003-S1008，再执行步骤S1009-S1013；也可以先执行步骤S1009-S1013，再执行步骤S1003-S1008；还可以同时执行步骤S1003-S1008和步骤S1009-S1013，本申请实施例对此不做具体限定。
本申请实施例提供的通信方法，一方面，可以在第一终端设备发生移动或切换前，将传输组播业务时使用的无线配置信息发送给第一终端设备，以使第一终端设备进行配置，从而降低由第一终端设备跨接入网设备切换引起的组播业务的时延；另一方面，可以在目标接入网设备上建立第一组播业务对应的第一组播会话，进而建立第一组播业务的数据由第一组播业务的提供者(例如，AF网元)到目标接入网设备的传输路径，从而保证第一组播业务的连续性，进一步降低由第一终端设备跨接入网设备切换引起的组播业务的时延。
可选的，在本申请实施例的一种实施场景下，上述步骤S1007中，目标接入网设备发送给AMF网元的信息还包括第一指示信息，该第一指示信息用于指示第一终端设备移动至目标接入网设备，进而在S1008中，AMF网元向SMF网元发送的消息2中还包括该第一指示信息；或者，上述步骤S1007中，AMF网元接收到来自目标接入网设备的路径切换请求消息后，在步骤S1008中AMF网元向SMF网元发送的消息2 中包括该第一指示信息；或者，在AMF网元接收到源接入网设备的消息(切换请求(handover required)消息)后向SMF网元发送该第一指示信息。
可选的，SMF网元接收到第一指示信息后，执行如下步骤S1014-S1016：
S1014、SMF网元向MCF网元发送第二消息。相应的，MCF网元接收来自SMF网元的第二消息。
其中，SMF网元接收到第一指示信息后，触发向MCF网元发送第二消息的动作，该第二消息用于请求MCF网元允许第一终端设备通过目标接入网设备接收第一组播业务的数据。
需要说明的是，本申请实施例中，“允许第一终端设备通过目标接入网设备接收第一组播业务的数据”，也可以理解为“对第一终端设备通过目标接入网设备接收第一组播业务的数据进行授权”，二者可以相互替换，本申请实施例对此不做具体限定。
可选的，第二消息可以包括第一终端设备的标识、第一标识、目标接入网设备的信息中的一项或多项。
S1015、MCF网元确定允许第一终端设备通过目标接入网设备接收第一组播业务的数据。
一种可能的实现方式中，上述步骤S1010中，MCF网元获取的第一组播业务的策略信息中还可以包括允许接收第一组播业务的数据的终端设备的标识，该允许接收第一组播业务的数据的终端设备与接入网设备无关，即无论该终端设备接入哪个接入网设备，均允许该终端设备通过其接入的接入网设备接收第一组播业务的数据。此时，若第二消息包括第一终端设备的标识，当该允许接收第一组播业务的数据的终端设备的标识包括第一终端设备的标识时，MCF网元确定允许第一终端设备通过目标接入网设备接收第一组播业务的数据。
另一种可能的实现方式中，上述步骤S1010中，MCF网元获取的第一组播业务的策略信息中还可以包括目标接入网设备的信息对应的允许接收第一组播业务的数据的终端设备的标识，该目标接入网设备的信息对应的允许接收第一组播业务的数据的终端设备，只有在接入目标接入网设备时，才允许其通过目标接入网设备接收第一组播业务的数据，例如，目标接入网设备的信息为TAI，该TAI对应的允许接收第一组播业务的数据的终端设备的标识，即表示在该TAI范围内允许接收第一组播业务的数据的终端设备的标识。此时，若第二消息包括第一终端设备的标识和目标接入网设备的信息，当该目标接入网设备的信息对应的允许接收第一组播业务的数据的终端设备的标识包括第一终端设备的标识时，MCF网元确定允许第一终端设备通过目标接入网设备接收第一组播业务的数据。
S1016、MCF网元向SMF网元发送第二指示信息。相应的，SMF网元接收来自MCF网元的第二指示信息。
其中，第二指示信息用于指示允许第一终端设备通过目标接入网设备接收第一组播业务的数据。
可选的，SMF网元接收到第二指示信息后，可以继续执行后续处理。
可选的，SMF网元接收到不允许第一终端设备通过目标接入网设备接收第一组播业务的数据的指示信息时，SMF网元通知目标接入网设备停止向第一终端设备发送第 一组播业务的数据，并将第一终端设备从目标接入网设备所创建的第一组播业务对应第一组播会话中删除。
基于该方案，只有当MCF网元允许第一终端通过目标接入网设备接收第一组播业务的数据时，目标接入网设备才继续向第一终端设备发送第一组播业务的数据，可以防止第一终端设备在不被允许接收第一组播业务的情况下仍然将第一组播业务的数据发送给第一终端设备的情况发生。
可选的，在本申请实施例的另一种实施场景下，在步骤S1013之后，本申请实施例提供的通信方法还包括：
S1013a、MCF网元向SMF网元发送第一组播业务对应的第一组播会话的标识。相应的，SMF网元接收来自MCF网元的第一组播业务对应的第一组播会话的标识。
其中，该步骤S1213a中MCF网元向SMF网元发送的第一组播业务对应的第一组播会话的标识可以是第一标识和第一组播会话的标识。
S1013b、SMF网元通过第一终端设备相关的信令连接向目标接入网设备发送消息3。相应的，目标接入网设备通过该信令连接接收来自SMF网元的消息3。
其中，该消息3中包括第一组播业务对应的第一组播会话的标识，该消息3用于请求目标接入网设备将第一终端设备与第一组播会话进行关联。
可选的，目标接入网设备接收到第一组播业务对应的第一组播会话的标识后，将第一组播会话与第一终端设备进行关联，例如，将第一终端设备的标识保存到第一组播会话的上下文，以便后续可以通过第一组播会话的上下文获取第一终端设备的标识，并根据第一终端设备的上下文为第一终端设备重新配置第一组播业务的空口传输方式或该传输方式对应的无线配置信息。
可选的，SMF网元可以在接收到MCF网元的指示允许第一终端设备通过目标接入网设备接收第一组播业务的数据的第二指示信息后，通过第一终端设备相关的信令连接向目标接入网设备发送消息3。
需要说明的是，本申请实施例中，步骤S1009-S1013与步骤S1014-S1016之间没有严格的执行顺序，可以先执行步骤S1009-S1013，再执行步骤S1014-S1016；也可以先执行步骤S1014-S1016，再执行步骤S1009-S1013；还可以同时执行步骤S1009-S1013和步骤S1014-S1016，本申请实施例对此不做具体限定。
其中，上述各个步骤中的各个网元的动作可以由图3所示的通信设备300中的处理器301调用存储器303中存储的应用程序代码来执行，本实施例对此不作任何限制。
以图1a或图1b或图1c所示的通信系统应用于如图2a或图2b或图2c所示的5G网络，第一会话管理网元为SMF网元，第一网络设备为第一M-SMF网元，第二网络设备为M-UPF网元，第三网络设备为第一M-AMF网元为例，如图11所示，为本申请实施例提供的一种通信方法，该通信方法包括如下步骤：
S1101-S1108、与图10所示的实施例中的步骤S1001-S1008类似，相关描述可参考图10所示的实施例，在此不再赘述。
可选的，区别仅在于，源接入网设备在向目标接入网设备发送的切换请求消息中还可以包括第二组播会话对应的M-AMF网元的标识，第二组播会话为源接入网设备建立的第一组播业务对应的组播会话。
可选的，若目标接入网设备确定目标接入网设备未建立第一组播业务对应的组播会话，此时，本申请实施例提供的通信方法还包括如下步骤：
S1109a、目标接入网设备向第一M-AMF网元发送消息3。相应的，第一M-AMF网元接收来自目标接入网设备的消息3。
可选的，目标接入网可以先选择第一M-AMF网元，再向第一M-AMF网元发送消息3。示例性的，目标接入网设备可以根据如下方式选择第一M-AMF网元：
方式一：若源接入网设备向目标接入网设备发送了第二组播会话对应的M-AMF网元的标识，则第一M-AMF网元可为该第二组播会话对应的M-AMF网元。
方式二：目标接入网设备根据目标接入网设备的信息，选择第一M-AMF网元。
可选的，目标接入网设备可以选择服务范围包括目标接入网设备的信息对应的服务范围的M-AMF网元，作为第一M-AMF网元。
方式三：目标接入网设备根据第一标识，选择第一M-AMF网元。
可选的，目标接入网设备可以选择支持第一标识所标识的第一组播业务的M-AMF网元，作为第一M-AMF网元。
方式四：目标接入网设备可以选择第一终端设备注册的AMF网元，作为第一M-AMF网元。
需要说明的是，在该方式下，可以认为第一终端设备注册的AMF网元和M-AMF网元合设，图11中AMF网元和第一M-AMF网元可以合并。
可以理解的是，目标接入网设备可以根据上述四种方式中的任意一种方式选择第一M-AMF网元，也可以结合上述四种方式中任意多种方式选择第一M-AMF网元，例如，目标接入网设备可以结合方式二和方式三选择第一M-AMF网元。
可选的，目标接入网设备可以通过设备级的N2消息(即该N2消息中不包括下一代应用协议(next generation application protocol，NGAP)标识)，向第一M-AMF网元发送消息3；或者，目标接入网设备也可以为第一组播业务创建与第一M-AMF网元之间的N2信令连接，以便后续传输第一组播业务相关的N2信令。例如，目标接入网设备在向第一M-AMF网元发送消息3时，可以向第一M-AMF网元发送目标接入网设备为第一组播业务分配的NGAP标识，相应的，在消息3的响应消息中，第一M-AMF网元向目标接入网设备发送第一M-AMF网元为第一组播业务分配的NAGP标识，至此，目标接入网设备与第一M-AMF网元之间的N2信令连接建立成功，在后续发送与第一组播业务相关的消息时，第一M-AMF网元和目标接入网设备使用上述NGAP标识来标识该第一组播业务，即，在该消息中包括目标接入网设备分配的NGAP标识和第一M-AMF网元分配的NGAP标识；或者，若目标接入网设备根据上述方式四选择第一M-AMF，则可选的，目标接入网设备还可以采用第一终端设备的信令连接向第一M-AMF网元发送消息3。
其中，该消息3中包括目标接入网设备发送给第一M-SMF网元的第一消息，第一消息包括第一标识，第一标识用于标识第一组播业务，该第一消息用于目标接入网设备请求建立第一组播业务对应的第一组播会话。
可选的，该第一消息还可以包括其他信息，例如，目标接入网设备的信息、信息2、第一组播业务的第一QoS流的信息等，详细方案可参见上述步骤S1009中的相关 描述，在此不再赘述。
可选的，第一消息中也可以不包括目标接入网设备的信息，在该情况下，第一M-AMF网元在向第一M-SMF网元发送第一消息时，可以将目标接入网设备的信息发送给第一M-SMF网元。
其中，该消息3还可以包括目标接入网设备发送给第一M-AMF网元的信息。
可选的，目标接入网设备发送给第一M-AMF网元的信息可以包括以下一项或多项：第一标识、第一组播业务对应的第一组播会话的标识、第一PDU会话的标识。其中，第一PDU会话为第一终端设备加入第一组播业务时所使用的PDU会话。
可选的，该消息3还可以用于请求第一M-AMF网元创建第一组播业务对应的上下文，以便第一M-AMF网元创建第一组播业务对应的上下文。
S1109b、第一M-AMF网元向第一M-SMF网元发送第一消息。相应的，第一M-SMF网元接收来自第一M-AMF网元的第一消息。
可选的，第一M-AMF网元可以先选择第一M-SMF网元，再向第一M-SMF网元发送第一消息。示例性的，第一M-AMF网元可以根据如下方式选择第一M-SMF网元：
方式一：第一M-AMF网元根据目标接入网设备的信息，选择第一M-SMF网元。
可选的，目标接入网设备可以选择服务范围包括目标接入网设备的信息对应的服务范围的M-SMF网元，作为第一M-SMF网元。
方式二：第一M-AMF根据第一标识，选择第一M-SMF网元。
可选的，目标接入网设备可以选择支持第一标识所标识的第一组播业务的M-SMF网元，作为第一M-SMF网元。
方式三：若第一M-AMF网元为第二组播会话对应的M-AMF网元，第一M-AMF网元选择为源接入网设备的组播会话服务的M-SMF网元，作为第一M-SMF网元。
方式四：若第一M-AMF网元是第一终端设备注册的AMF网元，且目标接入网设备发送给第一M-AMF网元的信息包括第一PDU会话的标识，第一M-AMF网元选择第一PDU会话对应的SMF网元，作为第一M-SMF网元。
需要说明的是，在该方式下，可以认为AMF网元和第一M-AMF网元合设、SMF网元和M-SMF网元合设，图11中AMF网元和第一M-AMF网元可以合并、SMF网元和第一M-SMF网元可以合并。下述步骤S1114和步骤S1116不执行。
可以理解的是，第一M-AMF网元可以根据上述四种方式中的任意一种方式选择第一M-SMF网元，也可以结合上述四种方式中任意多种方式选择第一M-SMF网元，例如，第一M-AMF网元可以结合方式二和方式三选择第一M-SMF网元。
S1110、第一M-SMF网元建立第一组播业务对应的第一组播会话。
其中，该步骤S1110与上述步骤S1010类似，区别在于，该步骤S1110中的执行主体为第一M-SM F网元，步骤S1010中的执行主体为MCF网元。
可选的，当第一消息还包括上述信息2，该信息2包括第一路径信息时，第一M-SMF网元执行步骤S1111，为第一组播业务的数据传输建立M-UPF网元与目标接入网设备之间的隧道。
可选的，若还未在M-UPF网元与MUF网元之间为第一组播业务的数据传输建立隧道，则本申请实施例提供的通信方法还包括步骤S1112a-S1112b。
S1111、第一M-SMF网元向M-UPF网元发送第一路径信息。相应的，M-UPF网元接收来自第一M-SMF网元的第一路径信息。
其中，该步骤S1111与上述步骤S1011类似，相关描述可参考上述步骤S1011，在此不再赘述。
S1112a、第一M-SMF网元向MCF网元发送第三路径信息。相应的，MCF网元接收来自第一M-SMF网元的第三路径信息。
其中，第三路径信息的相关描述可参考上述步骤S1012，在此不再赘述。
可选的，MCF网元接收到第三路径信息后，执行步骤S1112b。
S1112b、MCF网元向MUF网元发送第三路径信息。相应的，MUF网元接收来自MCF网元的第三路径信息。
可选的，MUF网元接收到该第三路径信息后，保存该第三路径信息，后续在接收到来自AF网元的第一组播业务的数据时，根据第三路径信息向MUF网元发送第一组播业务的数据。
至此，第一组播业务的数据可以从AF网元经过MUF网元和M-UPF网元发送至目标接入网设备，再由目标接入网设备发送给第一终端设备。
S1113a、MCF网元向第一M-SMF网元发送响应消息1。相应的，第一M-SMF网元接收来自MCF网元的响应消息1。
S1113b、第一M-SMF网元向第一M-AMF网元发送响应消息2。相应的，第一M-AMF网元接收来自第一M-SMF网元的响应消息2。
可选的，该响应消息2包括第一M-SMF网元发送给目标接入网设备的信息。例如，在第一消息不包括信息2时，第一M-SMF网元发送给目标接入网设备的信息包括信息3，该信息3包括第一组播会话的标识和第二路径信息中的至少一项，此时，相应的，第一M-SMF网元还将第二路径信息通过MCF网元发送给M-UPF网元，相关描述可参考上述步骤S1013，在此不再赘述。
S1113c、第一M-AMF网元向目标接入网设备发送响应消息3。相应的，目标接入网设备接收来自第一M-AMF网元的响应消息3。
其中，该响应消息3中包括第一M-SMF网元发送给目标接入网设备的信息，例如，信息3。
可选的，目标接入网设备接收信息3后的处理，可参考上述步骤S1013中的相关描述，在此不再赘述。
需要说明的是，本申请实施例中，步骤S1103-S1108与步骤S1109a-S1113c之间没有严格的执行顺序，可以先执行步骤S1103-S1108，再执行步骤S1109a-S1113c；也可以先执行步骤S1109a-S1113c，再执行步骤S1103-S1108；还可以同时执行步骤S1103-S1108和步骤S1109a-S1113c，本申请实施例对此不做具体限定。
本申请实施例提供的通信方法，一方面，可以在第一终端设备发生移动或切换前，将传输组播业务时使用的无线配置信息发送给第一终端设备，以使第一终端设备进行配置，从而降低由第一终端设备跨接入网设备切换引起的组播业务的时延；另一方面，可以在目标接入网设备上建立第一组播业务对应的第一组播会话，进而建立第一组播业务的数据由第一组播业务的提供者(例如，AF网元)到目标接入网设备的传输路径， 从而保证第一组播业务的连续性，进一步降低由第一终端设备跨接入网设备切换引起的组播业务的时延。
可选的，在本申请实施例的一种实施场景下，上述步骤S1107中，目标接入网设备发送给AMF网元的信息还包括第一指示信息，该第一指示信息用于指示第一终端设备移动至目标接入网设备，进而在S1108中，AMF网元向SMF网元发送的消息2中还包括该第一指示信息；或者，上述步骤S1107中，AMF网元接收到来自目标接入网设备的路径切换请求消息后，在步骤S1108中AMF网元向SMF网元发送的消息2中包括该第一指示信息；或者，在AMF网元接收到源接入网设备的消息(切换请求(handover required)消息)后向SMF网元发送该第一指示信息，此时，图11所示的通信方法还包括步骤S1114-S1116。其中，步骤S1114-S1116与图10所示的实施例中的步骤S1014-S1016类似，相关描述可参考图10所示的实施例，在此不再赘述。
需要说明的是，本申请实施例中，步骤S1109a-S1113c与步骤S1114-S1116之间没有严格的执行顺序，可以先执行步骤S1109a-S1113c，再执行步骤S1114-S1116；也可以先执行步骤S1114-S1116，再执行步骤S1109a-S1113c；还可以同时执行步骤S1109a-S1113c和步骤S1114-S1116，本申请实施例对此不做具体限定。
其中，上述各个步骤中的各个网元的动作可以由图3所示的通信设备300中的处理器301调用存储器303中存储的应用程序代码来执行，本实施例对此不作任何限制。
以图1a或图1b或图1c所示的通信系统应用于如图2a或图2b或图2c所示的5G网络，第一会话管理网元为SMF网元，第一网络设备为MCF网元，第二网络设备为M-UPF网元为例，如图12所示，为本申请实施例提供的一种通信方法，该通信方法包括如下步骤：
S1201-S1208、与图10所示的实施例中的步骤S1001-S1008相同，相关描述可参考图10所示的实施例，在此不再赘述。
可选的，在本申请实施例的一种实施场景下，一种可能的实现方式中，步骤S1207中，目标接入网设备发送给SMF网元的信息还包括第一指示信息和第一标识信息，该第一指示信息用于指示第一终端设备移动至目标接入网设备，该第一标识信息为第一标识或第一PDU会话的标识，此时，第一PDU会话的标识为PDU会话标识(PDU Session ID)，进而在S1208中，AMF网元向SMF网元发送的消息2中还包括该第一指示信息和第一标识信息；
另一种可能的实现方式中，上述步骤S1207中，AMF网元接收到来自目标接入网设备的路径切换请求消息后，在步骤S1208中AMF网元向SMF网元发送的消息2中包括该第一指示信息和第一标识信息，其中，第一标识信息为第一PDU会话的标识，此时，第一PDU会话的标识为SMF网元为该第一PDU会话分配的上下文标识(即该第一PDU会话在该SMF网元中的URI)；
再一种可能的实现方式中，在AMF网元接收到源接入网设备的消息(切换请求(handover required)消息)后向SMF网元发送该第一指示信息和第一标识信息，其中，第一标识信息为第一PDU会话的标识，此时，第一PDU会话的标识也为SMF网元为该第一PDU会话分配的上下文标识(即该第一PDU会话在该SMF网元中的URI)。
可选的，SMF网元接收到第一指示信息和第一标识信息后，执行如下步骤 S1209-S1214：
S1209、SMF网元根据第一指示信息，向MCF网元发送消息3。相应的，MCF网元接收来自SMF网元的消息3。
其中，该消息3包括目标接入网设备的信息和第一标识。
可选的，该消息3可以用于通知存在终端设备通过目标接入网设备接收第一组播业务的数据，以使MCF网元进行后续处理，例如，继续执行下述步骤S1210。或者，可选的，该消息3用于向MCF网元请求目标接入网设备为第一组播业务创建的第一组播会话的信息，若目标接入网设备为第一组播业务创建了第一组播会话，则MCF网元将第一组播会话的信息返回给SMF网元，否则，继续执行下述步骤S1210。
可选的，若第一标识信息为第一PDU会话的标识，则步骤S1209之前，本申请实施例提供的通信方法还包括：SMF网元根据第一PDU会话的标识，从第一PDU会话对应的上下文中获得第一标识。
S1210、MCF网元确定目标接入网设备未建立第一组播业务对应的组播会话。
其中，MCF网元根据目标接入网设备的信息和第一标识，确定目标接入网设备未建立第一组播业务对应的组播会话，该步骤的详细实现可参考上述步骤S702中的相关描述，在此不再赘述。
可选的，MCF网元确定目标接入网设备未建立第一组播业务对应的组播会话后，判断目标接入网设备是否位于第一组播业务的服务范围内，当目标接入网设备位于第一组播业务的服务范围内时，执行如下步骤S1211。其中，MCF网元确定目标接入网设备是否位于第一组播业务的服务范围内的实现方式，可参考上述步骤S1010中的相关描述，在此不再赘述。
S1211、MCF网元向目标接入网设备发送第三消息。相应的，目标接入网设备接收来自MCF网元的第三消息。
其中，第三消息用于请求目标接入网设备建立第一组播业务对应的第一组播会话。该第三消息包括第一标识。
可选的，该第三消息可以包括第一组播会话的标识和第二路径信息中的至少一项，相关描述可参考上述步骤S1013，在此不再赘述。
可选的，MCF网元可通过第一终端设备注册的AMF网元向目标接入网设备发送第三消息。此时，可选的，SMF网元可将第一终端设备注册的AMF网元的标识信息发送给MCF网元，以便MCF网元向该AMF网元发送第三消息；或者，MCF网元可通过SMF网元和第一终端设备注册的AMF网元向目标接入网设备发送第三消息；或者，MCF网元可选择一个AMF网元以便经过该AMF网元向目标接入网设备发送第三消息，例如MCF网元可以根据目标接入网设备的信息选择AMF网元，并通过该AMF网元向目标接入网设备发送第三消息，本申请实施例对此不做具体限定。
S1212、目标接入网设备向MCF网元发送响应消息。相应的，MCF网元接收来自目标接入网设备的响应消息。
可选的，若上述第三消息中不包括第一组播会话的标识和第二路径信息中的至少一项，则该响应消息中包括第一组播会话的标识和第一路径信息中的至少一项；或者，若目标接入网设备不支持采用组播方式接收数据，则该响应消息中也可以包括第一路 径信息。可选的，当该响应消息中包括第一路径信息时，MCF网元执行步骤S1213，为第一组播业务的数据传输建立M-UPF网元与目标接入网设备之间的隧道。
可选的，若还未在M-UPF网元MUF网元之间为第一组播业务的数据传输建立隧道，则MCF网元还执行步骤S1214。
S1213、MCF网元向M-UPF网元发送第一路径信息。相应的，M-UPF网元接收来自MCF网元的第一路径信息。
S1214、MCF网元向MUF网元发送第三路径信息。相应的，MUF网元接收来自MCF网元的第三路径信息。
其中，步骤S1213-S1214的相关描述可参考上述步骤S1011-S1012，在此不再赘述。
需要说明的是，本申请实施例中，步骤S1203-S1208与步骤S1209-S1214之间没有严格的执行顺序，可以先执行步骤S1203-S1208，再执行步骤S1209-S1214；也可以先执行步骤S1209-S1214，再执行步骤S1203-S1208；还可以同时执行步骤S1203-S1208和步骤S1209-S1214，在此不再赘述。
本申请实施例提供的通信方法，一方面，可以在第一终端设备发生移动或切换前，将传输组播业务时使用的无线配置信息发送给第一终端设备，以使第一终端设备进行配置，从而降低由第一终端设备跨接入网设备切换引起的组播业务的时延；另一方面，可以在目标接入网设备上建立第一组播业务对应的第一组播会话，进而建立第一组播业务的数据由第一组播业务的提供者(例如，AF网元)到目标接入网设备的传输路径，从而保证第一组播业务的连续性，进一步降低由第一终端设备跨接入网设备切换引起的组播业务的时延。
可选的，在本申请实施例的一种实施场景下，在步骤S1212之后，本申请实施例提供的通信方法还包括：
S1212a、MCF网元向SMF网元发送第一组播业务对应的第一组播会话的标识。相应的，SMF网元接收来自MCF网元的第一组播业务对应的第一组播会话的标识。
其中，该步骤S1212a中MCF网元向SMF网元发送的第一组播业务对应的第一组播会话的标识可以是第一标识和第一组播会话的标识。
S1212b、SMF网元通过第一终端设备相关的信令连接向目标接入网设备发送消息4。相应的，目标接入网设备通过该信令连接接收来自SMF网元的消息4。
其中，该消息4中包括第一组播业务对应的第一组播会话的标识，该消息4用于请求目标接入网设备将第一终端设备与第一组播会话进行关联。
可选的，目标接入网设备接收到第一组播业务对应的第一组播会话的标识后，将第一组播会话与第一终端设备进行关联，例如，将第一终端设备的标识保存到第一组播会话的上下文，以便后续可以通过第一组播会话的上下文获取第一终端设备的标识，并根据第一终端设备的上下文为第一终端设备重新配置第一组播业务的空口传输方式或该传输方式对应的无线配置信息。
可选的，在本申请实施例的另一种实施场景下，上述步骤S1209中，SMF网元向MCF网元发送的消息3中还可以包括第四消息。其中，该第四消息用于请求第一网络设备允许第一终端设备通过目标接入网设备接收第一组播业务的数据。
可选的，第四消息可以包括第一终端设备的标识、第一标识、目标接入网设备的信息中的一项或多项。
可选的，MCF网元接收到该第四消息后，执行如下步骤S1215-S1216：
S1215、MCF网元确定允许第一终端设备通过目标接入网设备接收第一组播业务的数据。
可选的，MCF网元可以根据第一组播业务的策略信息，确定允许第一终端设备通过目标接入网设备接收第一组播业务的数据，相关描述可参考上述步骤S1015，在此不再赘述。
S1216、MCF网元向SMF网元发送第三指示信息。相应的，SMF网元接收来自MCF网元的第三指示信息。
其中，第三指示信息用于指示允许第一终端设备通过目标接入网设备接收第一组播业务的数据。
可选的，SMF网元接收到第三指示信息后，可以继续执行后续处理。
可选的，MCF网元可以将第三指示信息和步骤S1212a中的第一组播业务对应的第一组播会话的标识包含在一条消息中发送给SMF网元，也可以通过两条消息分别发送第三指示信息和第一组播业务对应的第一组播会话的标识，本申请实施例对此不做具体限定。
可选的，SMF网元接收到不允许第一终端设备通过目标接入网设备接收第一组播业务的数据的指示信息时，SMF网元通知目标接入网设备停止向第一终端设备发送第一组播业务的数据，并将第一终端设备从目标接入网设备所创建的第一组播业务对应第一组播会话中删除。
基于该方案，只有当MCF网元允许第一终端通过目标接入网设备接收第一组播业务的数据时，目标接入网设备才继续向第一终端设备发送第一组播业务的数据，可以防止第一终端设备在不被允许接收第一组播业务的情况下仍然将第一组播业务的数据发送给第一终端设备的情况发生。
可选的，在本申请实施例的又一种实施场景下，在步骤S1209之前，本申请实施例提供的通信方法还包括如下步骤S1217：
S1217、SMF网元确定允许第一终端设备通过目标接入网设备接收第一组播业务的数据。
一种可能的实现方式中，SMF网元可以获取第一终端设备的策略信息，该第一终端设备的策略信息可以包括第一终端设备接收第一组播业务的数据的区域信息，当目标接入网设备位于该区域信息指示的区域内时，SMF网元确定允许第一终端设备通过目标接入网设备接收第一组播业务的数据。
需要说明的是，上述第一终端设备的策略信息也可以称为第一终端设备的签约信息，二者可以相互替换，本申请实施例对此不做具体限定。
需要说明的是，目标接入网设备位于上述区域信息指示的区域内，可以理解为该区域信息指示的区域包括目标接入网设备的服务范围，或者该区域信息指示的区域与目标接入网设备的服务范围存在交集。
另一种可能的实现方式中，SMF网元也可以获取第一组播业务的策略信息，从而 根据第一组播业务的策略信息，确定允许第一终端设备通过目标接入网设备接收第一组播业务的数据，相关描述可参考上述步骤S1015，在此不再赘述。
需要说明的是，若SMF网元确定不允许第一终端设备通过目标接入网设备接收第一组播业务的数据，则SMF网元可以不触发执行包括步骤S1209在内的S1209之后的步骤。此时，SMF网元通知目标接入设备停止向第一终端设备发送第一组播业务的数据，并将第一终端设备从第一组播会话的上下文中删除。
其中，上述各个步骤中的各个网元的动作可以由图3所示的通信设备300中的处理器301调用存储器303中存储的应用程序代码来执行，本实施例对此不作任何限制。
以图1a或图1b或图1c所示的通信系统应用于如图2a或图2b或图2c所示的5G网络，第一会话管理网元为SMF网元，第二网络设备为M-UPF网元为例，如图13所示，为本申请实施例提供的一种通信方法，该通信方法包括如下步骤：
S1301-S1308、与图10所示的实施例中的步骤S1001-S1008相同，相关描述可参考图10所示的实施例，在此不再赘述。
可选的，在本申请实施例的一种实施场景下，目标接入网设备或AMF网元可以向SMF网元发送第一指示信息和第一标识信息，详细说明可参见上述步骤S1209之前的相关描述，在此不再赘述。
可选的，SMF网元接收到第一指示信息和第一标识信息后，可以确定第一终端设备发生切换，并且第一终端设备加入了第一组播业务，从而可以执行下述步骤：
S1309、SMF网元确定目标接入网设备未建立第一组播业务对应的组播会话。
其中，SMF网元根据目标接入网设备的信息和第一标识信息，确定目标接入网设备未建立第一组播业务对应的组播会话。
可选的，当第一标识信息为第一标识时，SMF网元根据目标接入网设备的信息和第一标识，确定目标接入网设备未建立第一组播业务对应的组播会话；当第一标识信息为第一PDU会话的标识时，SMF网元从第一PDU会话对应的上下文中获取第一标识，再根据目标接入网设备的信息和第一标识，确定目标接入网设备未建立第一组播业务对应的组播会话。
可选的，SMF网元可以通过与第四网络设备之间的交互，根据目标接入网设备的信息和第一标识，确定目标接入网设备未建立第一组播业务对应的组播会话。其中，第四网络设备可以是存储有已经建立的组播会话的信息的网元。
其中，第四网络设备中存储的已经建立的组播会话的信息可以包括组播会话的标识、组播会话对应的接入网设备的信息、组播会话对应的组播业务的标识、服务于该组播会话的SMF网元的标识。
可选的，第四网络设备例如可以是5G网络中的UDM网元，或者PCF网元，或者UDR网元等，本申请实施例中，以第四网络设备为UDM网元为例进行说明。
可选的，如图14所示，SMF网元通过与UDM网元之间的交互，根据目标接入网设备的信息和第一标识，确定目标接入网设备未建立第一组播业务对应的组播会话，可以包括如下步骤S1309a-S1309b：
S1309a、SMF网元向UDM网元发送第六消息。相应的，UDM网元接收来自SMF网元的第六消息。
其中，该第六消息用于查询目标接入网设备建立的第一组播业务对应的组播会话，该第六消息中包括目标接入网设备的信息和第一标识。
可选的，UDM网元接收到第六消息后，查询其存储的已经建立的组播会话的信息，若存在一个组播会话同时对应目标接入网设备的标识信息和第一标识，即组播会话对应的接入网设备信息包括目标接入网设备的信息，且该组播会话对应的组播业务的标识包括第一标识，则UDM网元将该组播会话的信息返回给SMF网元，或者UDM网元向SMF网元发送响应消息指示存在目标接入网设备建立的第一组播业务对应的组播会话，否则，执行步骤S1309b。
S1309b、UDM网元向SMF网元发送第四指示信息。相应的，UDM网元接收来自SMF网元的第四指示信息。
其中，该第四指示信息用于指示目标接入网设备未建立第一组播业务对应的组播会话。SMF网元接收到该第四指示信息后，即可确定目标接入网设备未建立第一组播业务对应的组播会话。
可选的，SMF网元在确定目标接入网设备未建立第一组播业务对应的组播会话后，执行如下步骤S1310发起组播会话的建立流程。
S1310、SMF网元通过AMF网元向目标接入网设备发送第五消息。相应的，目标接入网设备通过AMF网元接收来自SMF网元的第五消息。
可选的，SMF网元可以判断目标接入网设备是否位于第一组播业务的服务范围内，当目标接入网设备位于第一组播业务的服务范围内时，通过AMF网元向目标接入网设备发送第五消息。
可选的，SMF网元判断目标接入网设备是否位于第一组播业务的服务范围内的实现方式可参考上述步骤S1010中规定相关描述，在此不再赘述。
其中，该第五消息用于请求目标接入网设备建立第一组播业务对应的第一组播会话。该第五消息包括第一标识。
可选的，该第五消息还可以包括第一组播业务对应的第一组播会话的标识和第二路径信息中的至少一项，该第一组播会话的标识为SMF网元分配的，相关描述可参考上述步骤S1013，在此不再赘述。
S1311、目标接入网设备通过AMF网元向SMF网元发送响应消息。相应的，SMF网元通过AMF网元接收来自目标接入网设备的响应消息。
其中，该响应消息是目标接入网设备对于第五消息的响应。
可选的，当第五消息不包括第一组播会话的标识和第二路径信息中的至少一项时，该响应消息可以包括第一组播会话的标识和第一路径信息中的至少一项，该响应消息中包括的第一组播会话的标识是目标接入网设备分配的；或者，若目标接入网设备不支持采用组播方式接收数据，则该响应消息中也可以包括第一路径信息。
可选的，当该响应消息中包括第一路径信息时，SMF网元执行步骤S1312，为第一组播业务的数据传输建立M-UPF网元与目标接入网设备之间的隧道。
可选的，若还未在M-UPF网元与MUF网元之间为第一组播业务的数据传输建立隧道，则本申请实施例提供的通信方法还包括步骤S1313a-S1313b。
可选的，SMF网元接收到该响应消息后，还可以执行步骤S1314，以便将建立的 第一组播业务对应的第一组播会话的信息保存到UDM网元，或者说以便将第一组播会话的信息注册到UDM网元。
S1312、SMF网元向M-UPF网元发送第一路径信息。相应的，M-UPF网元接收来自SMF网元的第一路径信息。
其中，相关描述可参考上述步骤S1011，在此不再赘述。
S1313a、SMF网元向MCF网元发送第三路径信息。相应的，MCF网元接收来自SMF网元的第三路径信息。
其中，第三路径信息的相关描述可参考上述步骤S1012，在此不再赘述。可选的，MCF网元接收到第三路径信息后，执行步骤S1314b。
S1313b、MCF网元向MUF网元发送第三路径信息。相应的，MUF网元接收来自MCF网元的第三路径信息。
S1314、SMF网元向UDM网元发送第七消息。相应的，UDM网元接收来自SMF网元的第七消息。
其中，该第七消息用于将第一组播会话注册到UDM网元，该第七消息包括目标接入网设备的信息、第一标识、以及第一组播会话的标识。
本申请实施例提供的通信方法，一方面，可以在第一终端设备发生移动或切换前，将传输组播业务时使用的无线配置信息发送给第一终端设备，以使第一终端设备进行配置，从而降低由第一终端设备跨接入网设备切换引起的组播业务的时延；另一方面，可以在目标接入网设备上建立第一组播业务对应的第一组播会话，进而建立第一组播业务的数据由第一组播业务的提供者(例如，AF网元)到目标接入网设备的传输路径，从而保证第一组播业务的连续性，进一步降低由第一终端设备跨接入网设备切换引起的组播业务的时延。
可选的，在本申请实施例的一种实施场景下，在步骤S1311之后，本申请实施例提供的通信方法还包括：
S1315、SMF网元通过第一终端设备相关的信令连接向目标接入网设备发送消息3。相应的，目标接入网设备通过该信令连接接收来自SMF网元的消息3。
其中，该消息3中包括第一组播业务对应的第一组播会话的标识，该消息3用于请求目标接入网设备将第一终端设备与第一组播会话进行关联。第一组播业务对应的第一组播会话的标识可以是第一标识和第一组播会话的标识。
可选的，目标接入网设备接收到第一组播业务对应的第一组播会话的标识后的处理，可参考上述步骤S1212b中的相关描述，在此不再赘述。
其中，上述各个步骤中的各个网元的动作可以由图3所示的通信设备300中的处理器301调用存储器303中存储的应用程序代码来执行，本实施例对此不作任何限制。
以图1a或图1b或图1c所示的通信系统应用于如图2a或图2b或图2c所示的5G网络为例，如图15所示，为本申请实施例提供的一种通信方法，该通信方法包括如下步骤：
S1501-S1506、与图10所示的实施例中的步骤S1001-S1006相同，相关描述可参考图10所示的实施例，在此不再赘述。
S1507、目标接入网设备向AMF网元发送路径切换请求消息。相应的，AMF网元 接收来自目标接入网设备的路径切换请求消息。
其中，该AMF网元为第一终端设备注册的AMF网元。
可选的，该路径切换请求消息中可以包括信息4，该信息4包括以下一项或多项：第一标识、第一组播业务对应的第一组播会话的标识、第一组播业务的第一QoS流的信息、第一路径信息中的至少一项。其中，第一组播业务对应的第一组播会话的标识是目标接入网设备分配的，第一QoS流为第一组播业务的QoS流中的部分或全部QoS流，第一路径信息包括目标接入网设备的IP地址和第一隧道标识，详细说明可参考上述实施例中的相关描述，在此不再赘述。
可选的，当目标接入网设备未建立第一组播业务对应的组播会话时，该信息4还包括请求SMF网元创建第一组播业务对应的第一组播会话的指示信息。
其中，该步骤S1507中，目标接入网设备还向AMF网元指示第一PDU会话，以便AMF网元将信息4发送给第一PDU会话对应的会话管理网元，该第一PDU会话为第一终端设备加入第一组播业务时所使用的PDU会话。
可选的，目标接入网设备可以在该路径切换请求消息中包括第一PDU会话的标识，以向AMF网元指示第一PDU会话；并且，目标接入网设备将信息4与第一PDU会话关联，即指示信息4是针对第一PDU会话的。
可选的，AMF网元可以根据目标接入网设备指示的第一PDU会话，选择第一PDU会话对应的会话管理网元，并执行下述步骤S1508。
S1508、AMF网元向SMF网元发送消息2。相应的，SMF网元接收来自AMF网元的消息2。
其中，该SMF网元为第一PDU会话对应的会话管理网元。该消息2中包括上述信息4。可选的，该消息2可以为PDU会话修改请求消息，也可以是其他消息，本申请实施例对此不做具体限定。
可选的，SMF网元在第一终端设备加入第一组播业务时，可以获取第一组播业务的信息，并将该第一组播业务的信息保存在第一PDU会话对应的上下文中，该第一组播业务的信息例如可以包括：第一标识、第一组播业务的QoS流的信息、第二组播会话的标识、源接入网设备的信息等。其中，第一终端设备在与源接入网设备连接时已经加入了第一组播业务，第二组播会话为源接入网设备建立的第一组播业务对应的组播会话。
可选的，若上述信息4中包括第一组播会话的标识，则SMF网元使用第一组播会话的标识替换上述第二组播会话的标识；若保存了源接入网设备的信息，则使用目标接入网设备的信息替换源接入网设备的信息；若上述信息4包括第一QoS流的信息，SMF网元保存该第一QoS流的信息，用于后续计费处理等。
可选的，若上述信息4中包括创建第一组播会话的指示信息，则SMF网元创建第一组播业务对应的第一组播会话，也可以理解为创建第一组播业务对应的组播上下文，并在组播上下文中保存第一组播会话的标识、第一标识、第一组播业务的QoS流的信息、目标接入网设备的信息等。
可选的，SMF网元创建第一组播业务对应的第一组播会话后，还可以向第四网络设备发送消息，以便将第一组播会话注册到该第四网络设备中，其中，该第四网络设 备的说明可参考上述步骤S1309中的相关描述，在此不再赘述。
可选的，若上述信息4包括第一路径信息，则SMF网元执行下述步骤S1509。
S1509、SMF网元向UPF网元发送第一路径信息。相应的，UPF网元接收来自SMF网元的第一路径信息。
可选的，SMF网元可以通过N4会话更新请求消息向UPF网元发送第一路径信息，也可以通过其他消息发送，本申请实施例对此不做具体限定。
可选的，若还未在该UPF网元与MUF网元之间为第一组播业务的数据传输建立隧道，则本申请实施例提供的通信方法还包括S1510a-S1510b。
S1510a、SMF网元向MCF网元发送第三路径信息。相应的，MCF网元接收来自SMF网元的第三路径信息。
S1510b、MCF网元向MUF网元发送第三路径信息。相应的，MUF网元接收来自MCF网元的第三路径信息。
其中，步骤S1510a-S1510b的相关描述可参考上述步骤S1112a-S1112b，在此不再赘述。
至此，第一组播业务的数据可以从AF网元经过MUF网元和M-UPF网元发送至目标接入网设备，再由目标接入网设备发送给第一终端设备。
S1511、SMF网元通过AMF网元向目标接入网设备发送响应消息。相应的，目标接入网设备通过AMF网元接收来自SMF网元的响应消息。
可选的，当上述信息4中不包括第一组播业务对应的第一组播会话的标识时，该响应消息中包括第一组播业务对应的第一组播会话的标识。
可选的，目标接入网设备接收到第一组播业务对应的第一组播会话的标识后，可以将第一终端设备加入该第一组播会话，从而使得第一终端设备后续可以通过目标接入网设备接收第一组播业务的数据。
本申请实施例提供的通信方法，一方面，可以在第一终端设备发生移动或切换前，将传输组播业务时使用的无线配置信息发送给第一终端设备，以使第一终端设备进行配置，从而降低由第一终端设备跨接入网设备切换引起的组播业务的时延；另一方面，可以在目标接入网设备上建立第一组播业务对应的第一组播会话，进而建立第一组播业务的数据由第一组播业务的提供者(例如，AF网元)到目标接入网设备的传输路径，从而保证第一组播业务的连续性，进一步降低由第一终端设备跨接入网设备切换引起的组播业务的时延。
其中，上述各个步骤中的各个网元的动作可以由图3所示的通信设备300中的处理器301调用存储器303中存储的应用程序代码来执行，本实施例对此不作任何限制。
上述主要从各个网元之间交互的角度对本申请实施例提供的方案进行了介绍。相应的，本申请实施例还提供了通信装置，该通信装置可以为上述方法实施例中的目标接入网设备，或者包含上述目标接入网设备的装置，或者为可用于目标接入网设备的部件(例如芯片或者片上系统)；或者，该通信装置可以为上述方法实施例中的源接入网设备，或者包含上述源接入网设备的装置，或者为可用于源接入网设备的部件(例如芯片或者片上系统)；或者，该通信装置可以为上述方法实施例中的第一网络设备，或者包含上述第一网络设备的装置，或者为可用于第一网络设备的部件(例如芯片或 者片上系统)；或者，该通信装置可以为上述方法实施例中的第一会话管理网元，或者包含上述第一会话管理网元的装置，或者为可用于第一会话管理网元的部件(例如芯片或者片上系统)。
可以理解的是，该通信装置为了实现上述功能，其包含了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，本申请能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
比如，以采用集成的方式划分各个功能模块的情况下，图16示出了一种目标接入网设备160的结构示意图。该目标接入网设备160包括：处理模块1601和收发模块1602。所述收发模块1602，也可以称为收发单元用以实现收发功能，例如可以是收发电路，收发机，收发器或者通信接口。
其中，收发模块1602，用于接收来自源接入网设备的第一标识，第一标识用于标识第一组播业务；处理模块1601，用于确定第一组播业务的数据在目标接入网设备和第一终端设备之间的传输方式，该传输方式包括单播方式和组播方式；收发模块1602，还用于通过源接入网设备向第一终端设备发送该传输方式对应的无线配置信息。
可选的，收发模块1602，还用于接收来自源接入网设备的目标小区的信号测量信息，目标小区属于目标接入网设备；处理模块1601，用于确定第一组播业务的数据在目标接入网设备和第一终端设备之间的传输方式，包括：处理模块1601，用于根据信号测量信息和/或第一数量确定传输方式，第一数量为通过目标接入网设备接收第一组播业务的数据的终端设备的数量。
可选的，收发模块1602，还用于接收来自源接入网设备的第一组播业务的服务质量QoS流的信息；处理模块1601，还用于根据第一组播业务的QoS流的信息，获得传输方式对应的无线配置信息。
可选的，收发模块1602，还用于向第一网络设备发送第一消息，该第一消息包括第一标识，该第一消息用于请求建立第一组播业务对应的第一组播会话。
可选的，收发模块1602，还用于接收第一组播业务的第二信息，第一组播业务的第二信息包括：第一组播会话的标识和第二路径信息中的至少一项，其中，第二路径信息包括组播地址和第二隧道标识，组播地址用于目标接入网设备通过组播方式接收第一组播业务的数据，第二隧道标识用于标识目标接入网设备通过组播方式接收第一组播业务的数据的组播隧道。
可选的，收发模块1602，还用于发送第一指示信息和第一组播业务的第三信息，第一指示信息用于指示第一终端设备移动至目标接入网设备，第一组播业务的第三信息包括：第一标识、第一组播业务对应的第一组播会话的标识、以及第一组播业务的第一QoS流的信息中的至少一项，其中，第一QoS流为第一组播业务的QoS流中的部分或全部QoS流。
其中，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。
在本实施例中，该目标接入网设备160以采用集成的方式划分各个功能模块的形式来呈现。这里的“模块”可以指特定ASIC，电路，执行一个或多个软件或固件程序的处理器和存储器，集成逻辑电路，和/或其他可以提供上述功能的器件。在一个简单的实施例中，本领域的技术人员可以想到该目标接入网设备160可以采用图3所示的形式。
比如，图3中的处理器301可以通过调用存储器303中存储的计算机执行指令，使得目标接入网设备160执行上述方法实施例中的通信方法。
具体的，图16中的收发模块1602和处理模块1601的功能/实现过程可以通过图3中的处理器301调用存储器303中存储的计算机执行指令来实现。或者，图16中的处理模块1601的功能/实现过程可以通过图3中的处理器301调用存储器303中存储的计算机执行指令来实现，图16中的收发模块1602的功能/实现过程可以通过图3中的通信接口304来实现。
由于本实施例提供的目标接入网设备160可执行上述的通信方法，因此其所能获得的技术效果可参考上述方法实施例，在此不再赘述。
或者，比如，以采用集成的方式划分各个功能模块的情况下，图17示出了一种第一网络设备170的结构示意图。该第一网络设备170包括：处理模块1701和收发模块1702。所述收发模块1702，也可以称为收发单元用以实现收发功能，例如可以是收发电路，收发机，收发器或者通信接口。
一种可能的实现方式中：
收发模块1702，用于接收第一消息，该第一消息包括第一标识，第一标识用于标识第一组播业务，该第一消息用于目标接入网设备请求建立第一组播业务对应的第一组播会话；当目标接入网设备位于第一组播业务的服务范围内时，处理模块1701，用于建立第一组播业务对应的第一组播会话。
可选的，第一消息还包括目标接入网设备的信息，处理模块1701，还用于根据目标接入网设备的信息，确定目标接入网设备位于第一组播业务的服务范围内。
可选的，第一消息还包括第一路径信息，收发模块1702，还用于向第二网络设备发送所述第一路径信息。
可选的，收发模块1702，还用于发送第一组播会话的标识和第二路径信息中的至少一项，其中，第二路径信息包括组播地址和第二隧道标识，组播地址用于目标接入网设备通过组播方式接收第一组播业务的数据，第二隧道标识用于标识目标接入网设备通过组播方式接收第一组播业务的数据的组播隧道。
可选的，处理模块1701，还用于获取第一组播业务的策略信息，策略信息包括第一组播业务的服务范围。
可选的，收发模块1702，还用于接收第二消息，第二消息用于请求第一网络设备允许第一终端设备通过目标接入网设备接收第一组播业务的数据；收发模块1702，还用于发送第二指示信息，第二指示信息用于指示允许第一终端设备通过目标接入网设备接收第一组播业务的数据。
可选的，第一组播业务的策略信息包括允许接收第一组播业务的数据的终端设备的标识，第二消息包括第一终端设备的标识，当允许接收第一组播业务的数据的终端 设备的标识包括第一终端设备的标识时，处理模块1701，还用于确定允许第一终端通过目标接入网设备接收第一组播业务的数据。
另一种可能的实现方式中，收发模块1702，用于接收目标接入网设备的信息和第一标识，第一标识用于标识第一组播业务；处理模块1701，用于根据目标接入网设备的信息和第一标识，确定目标接入网设备未建立第一组播业务对应的组播会话；收发模块1702，还用于发送第三消息，第三消息用于请求目标接入网设备建立第一组播业务对应的第一组播会话。
可选的，收发模块1702，还用于接收第一组播业务对应的第一组播会话的标识和第一路径信息中的至少一项，其中，第一路径信息包括目标接入网设备的IP地址和第一隧道标识，第一隧道标识用于标识目标接入网设备接收第一组播业务的数据的单播隧道。
可选的，收发模块1702，还用于发送第三消息，包括：当目标接入网设备位于第一组播业务的服务范围内时，收发模块1702，还用于发送第三消息。
可选的，处理模块1701，还用于根据目标接入网设备的信息，确定目标接入网设备位于第一组播业务的服务范围内。
可选的，处理模块1701，还用于获取第一组播业务的策略信息，第一组播业务的策略信息包括第一组播业务的服务范围。
可选的，收发模块1702，还用于接收第四消息，第四消息用于请求第一网络设备允许第一终端设备通过目标接入网设备接收第一组播业务的数据；收发模块1702，还用于发送第三指示信息，第三指示信息用于指示允许第一终端设备通过目标接入网设备接收第一组播业务的数据。
可选的，第一组播业务的策略信息包括允许接收第一组播业务的数据的终端设备的标识；第四消息包括第一终端设备的标识；当允许接收第一组播业务的数据的终端设备的标识包括第一终端设备的标识时，处理模块1701，还用于确定允许第一终端通过目标接入网设备接收第一组播业务的数据。
其中，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。
在本实施例中，该第一网络设备170以采用集成的方式划分各个功能模块的形式来呈现。这里的“模块”可以指特定ASIC，电路，执行一个或多个软件或固件程序的处理器和存储器，集成逻辑电路，和/或其他可以提供上述功能的器件。在一个简单的实施例中，本领域的技术人员可以想到该第一网络设备170可以采用图3所示的形式。
比如，图3中的处理器301可以通过调用存储器303中存储的计算机执行指令，使得第一网络设备170执行上述方法实施例中的通信方法。
具体的，图17中的收发模块1702和处理模块1701的功能/实现过程可以通过图3中的处理器301调用存储器303中存储的计算机执行指令来实现。或者，图17中的处理模块1701的功能/实现过程可以通过图3中的处理器301调用存储器303中存储的计算机执行指令来实现，图17中的收发模块1702的功能/实现过程可以通过图3中的通信接口304来实现。
由于本实施例提供的第一网络设备170可执行上述的通信方法，因此其所能获得 的技术效果可参考上述方法实施例，在此不再赘述。
或者，比如，以采用集成的方式划分各个功能模块的情况下，图18示出了一种第一会话管理网元180的结构示意图。该第一会话管理网元180包括：处理模块1801和收发模块1802。所述收发模块1802，也可以称为收发单元用以实现收发功能，例如可以是收发电路，收发机，收发器或者通信接口。
一种可能的实现方式中：
收发模块1802，用于接收第一指示信息和第一标识信息，第一指示信息用于指示第一终端设备移动至目标接入网设备，第一标识信息为第一标识或第一PDU会话的标识，第一标识用于标识第一组播业务，第一PDU会话为第一终端设备加入第一组播业务时所使用的PDU会话；处理模块1801，用于根据第一指示信息，通过收发模块1802向第一网络设备发送目标接入网设备的信息和第一标识。
可选的，处理模块1801，还用于根据第一PDU会话的标识，从第一PDU会话对应的上下文中获得第一标识。
可选的，收发模块1802，还用于接收来自第一网络设备的第一组播业务对应的第一组播会话的标识；收发模块1802，还用于向目标接入网设备发送第一组播业务对应的第一组播会话的标识。
可选的，收发模块1802，还用于向第一网络设备发送第四消息，第四消息用于请求第一网络设备允许第一终端设备通过目标接入网设备接收第一组播业务的数据；收发模块1802，还用于接收来自第一网络设备的第三指示信息，第三指示信息用于指示允许第一终端通过目标接入网设备接收第一组播业务的数据。
可选的，处理模块1801，还用于确定允许第一终端设备通过目标接入网设备接收第一组播业务的数据。
可选的，处理模块1801，还用于确定允许第一终端设备通过目标接入网设备接收第一组播业务的数据，包括：处理模块1801，还用于获取第一终端设备的策略信息，第一终端设备的策略信息包括第一终端设备接收第一组播业务的数据的区域信息；当目标接入网设备位于区域信息指示的区域内时，处理模块1801，还用于确定允许第一终端设备通过目标接入网设备接收第一组播业务的数据。
可选的，收发模块1802，还用于接收来自目标接入网设备的第一组播业务的第一QoS流的信息，第一QoS流为第一组播业务的QoS流中的部分或全部QoS流。
另一种可能的实现方式中：
收发模块1802，用于接收第一指示信息和第一标识信息，第一指示信息用于指示第一终端设备移动至目标接入网设备，第一标识信息为第一标识或第一PDU会话的标识，第一标识用于标识第一组播业务，第一PDU会话为第一终端设备加入第一组播业务时所使用的PDU会话；处理模块1801，用于根据目标接入网设备的信息和第一标识信息，确定目标接入网设备未建立第一组播业务对应的组播会话；收发模块1802，还用于向目标接入网设备发送第五消息，第五消息用于请求目标接入网设备建立第一组播业务对应的第一组播会话。
可选的，收发模块1802，还用于接收第一组播业务对应的第一组播会话的标识和第一路径信息中的至少一项，其中，第一路径信息包括目标接入网设备的IP地址和第 一隧道标识，第一隧道标识用于标识目标接入网设备接收第一组播业务的数据的单播隧道。
可选的，处理模块1801，用于根据目标接入网设备的信息和第一标识信息，确定目标接入网设备未建立第一组播业务对应的组播会话，包括：处理模块1801，用于通过收发模块1802向第四网络设备发送第六消息，第六消息用于查询目标接入网设备建立的第一组播业务对应的组播会话，第六消息包括目标接入网设备的信息和第一标识；处理模块1801，还用于通过收发模块1802接收来自第四网络设备的第四指示信息，第四指示信息用于指示目标接入网设备未建立第一组播业务对应的组播会话。
可选的，收发模块1802，还用于向第四网络设备发送第七消息，第七消息用于将第一组播会话注册到第四网络设备，第七消息包括目标接入网设备的信息、第一标识以及第一组播会话的标识。
可选的，收发模块1802，还用于向目标接入网设备发送第五消息，包括：当目标接入网设备位于第一组播业务的服务范围内时，收发模块1802，还用于向目标接入网设备发送该第五消息。
可选的，处理模块1801，还用于根据目标接入网设备的信息，确定目标接入网设备位于第一组播业务的服务范围内。
可选的，处理模块1801，还用于获取第一组播业务的策略信息，该策略信息包括第一组播业务的服务范围。
其中，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。
在本实施例中，该第一会话管理网元180以采用集成的方式划分各个功能模块的形式来呈现。这里的“模块”可以指特定ASIC，电路，执行一个或多个软件或固件程序的处理器和存储器，集成逻辑电路，和/或其他可以提供上述功能的器件。在一个简单的实施例中，本领域的技术人员可以想到该第一会话管理网元180可以采用图3所示的形式。
比如，图3中的处理器301可以通过调用存储器303中存储的计算机执行指令，使得第一会话管理网元180执行上述方法实施例中的通信方法。
具体的，图18中的收发模块1802和处理模块1801的功能/实现过程可以通过图3中的处理器301调用存储器303中存储的计算机执行指令来实现。或者，图18中的处理模块1801的功能/实现过程可以通过图3中的处理器301调用存储器303中存储的计算机执行指令来实现，图18中的收发模块1802的功能/实现过程可以通过图3中的通信接口304来实现。
由于本实施例提供的第一会话管理网元180可执行上述的通信方法，因此其所能获得的技术效果可参考上述方法实施例，在此不再赘述。
或者，比如，以采用集成的方式划分各个功能模块的情况下，图19示出了一种源接入网设备190的结构示意图。该源接入网设备190包括：处理模块1901和收发模块1902。所述收发模块1902，也可以称为收发单元用以实现收发功能，例如可以是收发电路，收发机，收发器或者通信接口。
处理模块1901，用于获取第一标识；收发模块1902，用于向目标接入网设备发送 第一标识，第一标识用于标识第一组播业务；收发模块1902，还用于接收来自目标接入网设备的无线配置信息，无线配置信息与第一组播业务的数据在目标接入网设备和第一终端设备之间的传输方式对应，传输方式包括单播方式或组播方式；收发模块1902，还用于向第一终端设备发送无线配置信息。
可选的，收发模块1902，还用于向目标接入网设备发送目标小区的信号测量信息，目标小区属于目标接入网设备，信号测量信息用于目标接入网设备确定传输方式。
可选的，收发模块1902，还用于向目标接入网设备发送第一组播业务的服务质量QoS流的信息。
可选的，处理模块1901，还用于根据第一标识，获取第二组播会话的上下文，或者，处理模块1901，还用于根据第二组播会话的标识，获取第二组播会话的上下文，第二组播会话的上下文包括第一组播业务的QoS流的信息，第二组播会话为源接入网设备所建立的第一组播业务对应的组播会话。
可选的，处理模块1901，用于获取第一标识，包括：处理模块1901，用于从第一终端设备的上下文中获取第一标识。
可选的，处理模块1901，还用于从第一终端设备的上下文中获取源接入网设备所建立的第一组播业务对应的组播会话的标识。
其中，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。
在本实施例中，该源接入网设备190以采用集成的方式划分各个功能模块的形式来呈现。这里的“模块”可以指特定ASIC，电路，执行一个或多个软件或固件程序的处理器和存储器，集成逻辑电路，和/或其他可以提供上述功能的器件。在一个简单的实施例中，本领域的技术人员可以想到该源接入网设备190可以采用图3所示的形式。
比如，图3中的处理器301可以通过调用存储器303中存储的计算机执行指令，使得源接入网设备190执行上述方法实施例中的通信方法。
具体的，图19中的收发模块1902和处理模块1901的功能/实现过程可以通过图3中的处理器301调用存储器303中存储的计算机执行指令来实现。或者，图19中的处理模块1901的功能/实现过程可以通过图3中的处理器301调用存储器303中存储的计算机执行指令来实现，图19中的收发模块1902的功能/实现过程可以通过图3中的通信接口304来实现。
由于本实施例提供的源接入网设备190可执行上述的通信方法，因此其所能获得的技术效果可参考上述方法实施例，在此不再赘述。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件程序实现时，可以全部或部分地以计算机程序产品的形式来实现。该计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行计算机程序指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或者数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，DSL))或 无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可以用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)，光介质(例如，DVD)、或者半导体介质(例如固态硬盘(solid state disk，SSD))等。
尽管在此结合各实施例对本申请进行了描述，然而，在实施所要求保护的本申请过程中，本领域技术人员通过查看所述附图、公开内容、以及所附权利要求书，可理解并实现所述公开实施例的其他变化。在权利要求中，“包括”(comprising)一词不排除其他组成部分或步骤，“一”或“一个”不排除多个的情况。单个处理器或其他单元可以实现权利要求中列举的若干项功能。相互不同的从属权利要求中记载了某些措施，但这并不表示这些措施不能组合起来产生良好的效果。
尽管结合具体特征及其实施例对本申请进行了描述，显而易见的，在不脱离本申请的精神和范围的情况下，可对其进行各种修改和组合。相应地，本说明书和附图仅仅是所附权利要求所界定的本申请的示例性说明，且视为已覆盖本申请范围内的任意和所有修改、变化、组合或等同物。显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (35)

  1. 一种通信方法，其特征在于，所述方法应用于第一终端设备从源接入网设备移动到目标接入网设备的场景，所述方法包括：
    所述目标接入网设备接收来自所述源接入网设备的第一标识，所述第一标识用于标识第一组播业务；
    所述目标接入网设备确定所述第一组播业务的数据在所述目标接入网设备和所述第一终端设备之间的传输方式，所述传输方式包括单播方式或组播方式；
    所述目标接入网设备通过所述源接入网设备向所述第一终端设备发送所述传输方式对应的无线配置信息。
  2. 根据权利要求1所述的方法，其特征在于，所述传输方式为组播方式，所述无线配置信息包括调度指示信息，所述调度指示信息用于确定所述第一组播业务的调度信息，所述调度信息用于指示传输所述第一组播业务的无线资源。
  3. 根据权利要求1或2所述的方法，其特征在于，所述方法还包括：
    所述目标接入网设备接收来自所述源接入网设备的目标小区的信号测量信息，所述目标小区属于所述目标接入网设备；
    所述目标接入网设备确定所述第一组播业务的数据在所述目标接入网设备和所述第一终端设备之间的传输方式，包括：
    所述目标接入网设备根据所述信号测量信息和/或第一数量确定所述传输方式，所述第一数量为通过所述目标接入网设备接收所述第一组播业务的数据的终端设备的数量。
  4. 根据权利要求1-3任一项所述的方法，其特征在于，所述方法还包括：
    所述目标接入网设备接收来自所述源接入网设备的所述第一组播业务的服务质量QoS流的信息。
  5. 根据权利要求1-4任一项所述的方法，其特征在于，所述方法还包括：
    所述目标接入网设备发送第一指示信息和所述第一组播业务的第三信息，所述第一指示信息用于指示所述第一终端设备移动至所述目标接入网设备，所述第一组播业务的第三信息包括：所述第一标识、所述第一组播业务对应的第一组播会话的标识、以及所述第一组播业务的第一QoS流的信息中的至少一项，其中，所述第一QoS流为所述第一组播业务的QoS流中的部分或全部QoS流。
  6. 根据权利要求1-5任一项所述的方法，其特征在于，所述方法还包括：
    所述目标接入网设备接收第五消息，所述第五消息用于请求所述目标接入网设备建立所述第一组播业务对应的第一组播会话。
  7. 根据权利要求6所述的方法，其特征在于，所述方法还包括：
    所述目标接入网设备根据所述第五消息，发送所述第一组播业务对应的第一组播会话的标识和第一路径信息中的至少一项，其中，所述第一路径信息包括所述目标接入网设备的互联网协议IP地址和第一隧道标识，所述第一隧道标识用于标识所述目标接入网设备接收所述第一组播业务的数据的单播隧道。
  8. 根据权利要求1-5任一项所述的方法，其特征在于，所述方法还包括：
    所述目标接入网设备向第一网络设备发送第一消息，所述第一消息包括所述第一 标识，所述第一消息用于请求建立所述第一组播业务对应的所述第一组播会话。
  9. 根据权利要求8所述的方法，其特征在于，所述第一消息还包括所述第一组播业务的第一信息，所述第一信息包括所述第一组播会话的标识和第一路径信息中的至少一项，其中，所述第一路径信息包括所述目标接入网设备的IP地址和第一隧道标识，所述第一隧道标识用于标识所述目标接入网设备接收所述第一组播业务的数据的单播隧道。
  10. 根据权利要求8所述的方法，其特征在于，所述方法还包括：
    所述目标接入网设备接收所述第一组播业务的第二信息，所述第一组播业务的第二信息包括：所述第一组播会话的标识和第二路径信息中的至少一项，其中，所述第二路径信息包括组播地址和第二隧道标识，所述组播地址用于目标接入网设备通过组播方式接收第一组播业务的数据，所述第二隧道标识用于标识所述目标接入网设备通过组播方式接收第一组播业务的数据的组播隧道。
  11. 根据权利要求8-10任一项所述的方法，其特征在于，所述第一消息还包括所述目标接入网设备的信息，所述目标接入网设备的信息用于所述第一网络设备确定所述目标接入网设备位于所述第一组播业务的服务范围内。
  12. 根据权利要求1-11任一项所述的方法，其特征在于，所述方法还包括：
    所述目标接入网设备向第一会话管理网元发送所述第一组播业务的第一QoS流的信息，所述第一QoS流为所述第一组播业务的QoS流中的部分或全部QoS流，所述第一QoS流的信息用于所述第一会话管理网元进行计费。
  13. 一种通信方法，其特征在于，所述方法应用于第一终端设备从源接入网设备移动到目标接入网设备的场景，所述方法包括：
    第一会话管理网元接收第一指示信息和第一标识信息，所述第一指示信息用于指示所述第一终端设备移动至所述目标接入网设备，所述第一标识信息为第一标识或第一PDU会话的标识，所述第一标识用于标识第一组播业务，所述第一PDU会话为所述第一终端设备加入所述第一组播业务时所使用的PDU会话；
    所述第一会话管理网元根据所述目标接入网设备的信息和所述第一标识信息，确定所述目标接入网设备未建立所述第一组播业务对应的组播会话；
    所述第一会话管理网元向所述目标接入网设备发送第五消息，所述第五消息用于请求所述目标接入网设备建立所述第一组播业务对应的第一组播会话。
  14. 根据权利要求13所述的方法，其特征在于，所述方法还包括：
    所述第一会话管理网元接收所述第一组播业务对应的第一组播会话的标识和第一路径信息中的至少一项，其中，所述第一路径信息包括所述目标接入网设备的互联网协议IP地址和第一隧道标识，所述第一隧道标识用于标识所述目标接入网设备接收所述第一组播业务的数据的单播隧道。
  15. 根据权利要求13所述的方法，其特征在于，所述第五消息包括所述第一组播业务对应的第一组播会话的标识和第二路径信息中的至少一项，其中，所述第二路径信息包括组播地址和第二隧道标识，所述组播地址用于所述目标接入网设备通过组播方式接收所述第一组播业务的数据，所述第二隧道标识用于标识所述目标接入网设备通过组播方式接收所述第一组播业务的数据的组播隧道。
  16. 根据权利要求13-15任一项所述的方法，其特征在于，所述第一会话管理网元根据所述目标接入网设备的信息和所述第一标识信息，确定所述目标接入网设备未建立所述第一组播业务对应的组播会话，包括：
    所述第一会话管理网元向第四网络设备发送第六消息，所述第六消息用于查询所述目标接入网设备建立的所述第一组播业务对应的组播会话，所述第六消息包括所述目标接入网设备的信息和所述第一标识；
    所述第一会话管理网元接收来自所述第四网络设备的第四指示信息，所述第四指示信息用于指示所述目标接入网设备未建立所述第一组播业务对应的组播会话。
  17. 根据权利要求16所述的方法，其特征在于，所述第一标识信息为所述第一PDU会话的标识，所述方法还包括：
    所述第一会话管理网元根据所述第一PDU会话的标识，从所述第一PDU会话对应的上下文中获取所述第一标识。
  18. 根据权利要求13-17任一项所述的方法，其特征在于，所述方法还包括：
    所述第一会话管理网元向第四网络设备发送第七消息，所述第七消息用于将所述第一组播会话注册到所述第四网络设备，所述第七消息包括所述目标接入网设备的信息、所述第一标识以及所述第一组播会话的标识。
  19. 根据权利要求13-18任一项所述的方法，其特征在于，所述第一会话管理网元向所述目标接入网设备发送第五消息，包括：
    当所述目标接入网设备位于所述第一组播业务的服务范围内时，所述第一会话管理网元向所述目标接入网设备发送所述第五消息。
  20. 根据权利要求19所述的方法，其特征在于，所述方法还包括：
    所述第一会话管理网元根据所述目标接入网设备的信息，确定所述目标接入网设备位于所述第一组播业务的服务范围内。
  21. 根据权利要求19或20所述的方法，其特征在于，所述方法还包括：
    所述第一会话管理网元获取所述第一组播业务的策略信息，所述策略信息包括所述第一组播业务的服务范围。
  22. 一种通信方法，其特征在于，所述方法应用于第一终端设备从源接入网设备移动到目标接入网设备的场景，所述方法包括：
    第一网络设备接收第一消息，所述第一消息包括第一标识，所述第一标识用于标识第一组播业务，所述第一消息用于所述目标接入网设备请求建立所述第一组播业务对应的第一组播会话；
    当所述目标接入网设备位于所述第一组播业务的服务范围内时，所述第一网络设备建立所述第一组播业务对应的第一组播会话。
  23. 根据权利要求22所述的方法，其特征在于，所述第一消息还包括所述第一组播业务的第一信息，所述第一信息包括所述第一组播会话的标识和第一路径信息中的至少一项，其中，所述第一路径信息包括所述目标接入网设备的互联网协议IP地址和第一隧道标识，所述第一隧道标识用于标识所述目标接入网设备接收所述第一组播业务的数据的单播隧道。
  24. 根据权利要求22或23所述的方法，其特征在于，所述方法还包括：
    所述第一网络设备发送所述第一组播会话的标识和第二路径信息中的至少一项，其中，第二路径信息包括组播地址和第二隧道标识，所述组播地址用于所述目标接入网设备通过组播方式接收所述第一组播业务的数据，第二隧道标识用于标识所述目标接入网设备通过组播方式接收所述第一组播业务的数据的组播隧道。
  25. 根据权利要求22-24任一项所述的方法，其特征在于，所述方法还包括：
    所述第一网络设备根据所述目标接入网设备的信息，确定所述目标接入网设备位于所述第一组播业务的服务范围内。
  26. 根据权利要求22-25任一项所述的方法，其特征在于，所述方法还包括：
    所述第一网络设备获取所述第一组播业务的策略信息，所述第一组播业务的策略信息包括所述第一组播业务的服务范围。
  27. 一种目标接入网设备，其特征在于，所述目标接入网设备包括处理模块和收发模块；其中，在第一终端设备从源接入网设备移动到所述目标接入网设备的场景下，
    所述收发模块，用于接收来自所述源接入网设备的第一标识，所述第一标识用于标识第一组播业务；
    所述处理模块，用于确定所述第一组播业务的数据在所述目标接入网设备和所述第一终端设备之间的传输方式，所述传输方式包括单播方式或组播方式；
    所述收发模块，用于通过所述源接入网设备向所述第一终端设备发送所述传输方式对应的无线配置信息。
  28. 一种第一会话管理网元，其特征在于，所述第一会话管理网元包括收发模块和处理模块；其中，在第一终端设备从源接入网设备移动到目标接入网设备的场景下，
    所述收发模块，用于接收第一指示信息和第一标识信息，所述第一指示信息用于指示所述第一终端设备移动至所述目标接入网设备，所述第一标识信息为第一标识或第一PDU会话的标识，所述第一标识用于标识第一组播业务，所述第一PDU会话为所述第一终端设备加入所述第一组播业务时所使用的PDU会话；
    所述处理模块，用于根据所述目标接入网设备的信息和所述第一标识信息，确定所述目标接入网设备未建立所述第一组播业务对应的组播会话；
    所述收发模块，还用于向所述目标接入网设备发送第五消息，所述第五消息用于请求所述目标接入网设备建立所述第一组播业务对应的第一组播会话。
  29. 一种第一网络设备，其特征在于，所述第一网络设备包括收发模块和处理模块；其中，在第一终端设备从源接入网设备移动到目标接入网设备的场景下，
    所述收发模块，用于接收第一消息，所述第一消息包括第一标识，所述第一标识用于标识第一组播业务，所述第一消息用于所述目标接入网设备请求建立所述第一组播业务对应的第一组播会话；
    所述处理模块，用于当所述目标接入网设备位于所述第一组播业务的服务范围内时，建立所述第一组播业务对应的第一组播会话。
  30. 一种通信装置，其特征在于，所述通信装置包括：处理器和存储器；
    所述存储器用于存储计算机执行指令，当所述处理器执行所述计算机执行指令时，以使所述通信装置执行如权利要求1-12中任一项所述的方法，或者，以使所述通信装置执行如权利要求13-21中任一项所述的方法，或者，以使所述通信装置执行如权利 要求22-26中任一项所述的方法。
  31. 一种通信装置，其特征在于，所述通信装置包括：处理器和接口电路；
    所述接口电路，用于接收计算机执行指令并传输至所述处理器；
    所述处理器用于执行所述计算机执行指令，以使所述通信装置执行如权利要求1-12中任一项所述的方法，或者，以使所述通信装置执行如权利要求13-21中任一项所述的方法，或者，以使所述通信装置执行如权利要求22-26中任一项所述的方法。
  32. 一种通信装置，其特征在于，用于执行如权利要求1-12任一项所述的方法；或者，用于执行如权利要求13-21任一项所述的方法，或者，用于执行如权利要求22-26任一项所述的方法。
  33. 一种包含指令的计算机程序产品，其特征在于，当其在计算机上运行时，使得所述计算机执行如权利要求1-12任一项所述的方法；或者，当其在计算机上运行时，使得所述计算机执行如权利要求13-21任一项所述的方法；或者，当其在计算机上运行时，使得所述计算机执行如权利要求22-26任一项所述的方法。
  34. 一种计算机可读存储介质，其特征在于，包括指令，当所述指令在通信装置上运行时，以使所述通信装置执行如权利要求1-12中任一项所述的方法，或者，以使所述通信装置执行如权利要求13-21中任一项所述的方法，或者，以使所述通信装置执行如权利要求22-26中任一项所述的方法。
  35. 一种通信系统，其特征在于，所述通信系统包括源接入网设备和目标接入网设备；
    所述源接入网设备，用于向所述目标接入网设备发送第一标识，所述第一标识用于标识第一组播业务；
    所述目标接入网设备，用于接收来自所述源接入网设备的所述第一标识，并确定所述第一组播业务的数据在所述目标接入网设备和第一终端设备之间的传输方式，所述传输方式包括单播方式或组播方式；
    所述目标接入网设备，还用于通过所述源接入网设备向所述第一终端设备发送所述传输方式对应的无线配置信息。
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