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    • 4. 发明公开
    • COMMUNICATIONS SYSTEM, COMMUNICATION METHOD, AND APPARATUS THEREOF
    • EP4184960A3
    • 2023-07-12
    • EP22199577.2
    • 2018-09-27
    • HUAWEI TECHNOLOGIES CO., LTD.
    • YANG, YanmeiGE, Cuili
    • H04W4/06H04W76/40H04W88/14H04W92/24
    • This application discloses a communications system, a communication method, and an apparatus thereof. The communications system provided in this application achieves separation of a multicast service control function from a multicast transmission management function. The communications system includes a multicast session management network element, an access and mobility management network element and a user plane function network element. The multicast session management network element sends a first multicast session request to the access and mobility management network element, where the first multicast session request carries a multicast session context, and the first multicast session request is used to request to establish a multicast session based on the multicast session context; and sends a second multicast session request to the user plane function network element, where the second multicast session request carries user plane forwarding-related information used to indicate a user plane forwarding rule of the multicast session. The access and mobility management network element receives the first multicast session request, and sends the first multicast session request to an access network node. The user plane function network element receives the second multicast session request, and sets, based on the user plane forwarding-related information, the user plane forwarding rule of the multicast session.
    • 6. 发明公开
    • SESSION ESTABLISHMENT METHOD AND DEVICE
    • EP3745807A1
    • 2020-12-02
    • EP19754470.3
    • 2019-01-11
    • HUAWEI TECHNOLOGIES CO., LTD.
    • GE, CuiliYANG, Yanmei
    • H04W76/10
    • This specification provides a session establishment method and device. The method includes: sending, by an SMF entity, a PDU session establishment request message to a terminal, where the PDU session establishment request message is used to request to establish a PDU session; and receiving, by the SMF entity, a PDU session establishment response message from the terminal. A method for actively initiating a PDU session establishment procedure on a network side is provided. When the terminal needs to be switched from a broadcast path to a unicast path, a PDU session may be established for the terminal on the network side, to establish the unicast path. Because it can be ensured that a same UPF entity is selected for the broadcast path and the unicast path on the network side, during switching from a broadcast session to a unicast session, negotiation performed when user plane downlink data is switched from the broadcast path to the unicast path is avoided, so that a delay of switching from the broadcast path to the unicast path can be reduced, to ensure fast switching that meets service continuity requirements in a broadcast mode and a unicast mode. In addition, this can reduce signaling interaction, and further reduce a delay.