WO2019196608A1 - 传输数据的方法和装置 - Google Patents

传输数据的方法和装置 Download PDF

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Publication number
WO2019196608A1
WO2019196608A1 PCT/CN2019/078815 CN2019078815W WO2019196608A1 WO 2019196608 A1 WO2019196608 A1 WO 2019196608A1 CN 2019078815 W CN2019078815 W CN 2019078815W WO 2019196608 A1 WO2019196608 A1 WO 2019196608A1
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WIPO (PCT)
Prior art keywords
upf
broadcast
request message
information
backhaul
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Application number
PCT/CN2019/078815
Other languages
English (en)
French (fr)
Inventor
杨艳梅
葛翠丽
应江威
Original Assignee
华为技术有限公司
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Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to AU2019250861A priority Critical patent/AU2019250861B2/en
Priority to EP19784294.1A priority patent/EP3764696B1/en
Publication of WO2019196608A1 publication Critical patent/WO2019196608A1/zh
Priority to US17/064,296 priority patent/US20210022063A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/38—Flow based routing
    • 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
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H04W4/44—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H04W4/46—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for vehicle-to-vehicle communication [V2V]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/24—Connectivity information management, e.g. connectivity discovery or connectivity update
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/12—Setup of transport tunnels
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08—Mobility data transfer
    • H04W8/082—Mobility data transfer for traffic bypassing of mobility servers, e.g. location registers, home PLMNs or home agents

Definitions

  • the present application relates to the field of communications, and in particular, to a method and apparatus for transmitting data.
  • terminal data such as vehicle and everything (V2X) messages can be transmitted to the network side through an uplink, and then the network The side is sent to other terminals through the downlink.
  • the application server is an anchor point for data processing and forwarding, that is, the uplink of the terminal sending data must reach an application server (AS), and the application server processes the data (such as parsing the data), and then The downlink data is transmitted by the application server.
  • AS application server
  • AS application server
  • the application server processes the data (such as parsing the data)
  • the downlink data is transmitted by the application server.
  • some data only needs to be transmitted in a small range (for example, a radius of 300 meters), and some data does not need to be processed by the server. All the server can do is to forward and increase the delay.
  • how to achieve a reduction in data transmission delay in a small area is currently a problem to be solved.
  • the present application provides a method and apparatus for transmitting data by sending a request message to a user plane function (UPF) that manages a broadcast session, the request message requesting a UPF that manages a broadcast session to perform local broadcast back on part of the uplink information.
  • the transmission does not send this part of the uplink information to the AS, which can reduce the transmission delay of the uplink information broadcasted in a small range.
  • UPF user plane function
  • a first aspect provides a method for transmitting data, including: a terminal sending a first request message to a session management function (SMF), where the first request message is used to request to perform a UPF local broadcast back to the unicast stream data.
  • the terminal receives the response message of the first request message.
  • SMF session management function
  • the unicast stream data may be data over unicast flow or data streamed through quality of service (QoS).
  • QoS quality of service
  • the first request message is used to request to perform UPF local broadcast backhaul on the unicast stream data, so that the UPF managing the broadcast session no longer forwards the received unicast stream data to the AS, but directly receives the received unicast stream data.
  • Performing a broadcast backhaul locally i.e., managing the UPF of a broadcast session) reduces the length of the transmission path of the unicast stream data, thereby reducing the transmission delay of the unicast stream data that needs to be broadcast in a small range.
  • the response message is used to indicate that the first request message has been accepted.
  • the response message of the first request message may be, for example, an acknowledgement (ACK) or a negative acknowledgement (NACK).
  • ACK acknowledgement
  • NACK negative acknowledgement
  • the response message of the first request message is used to indicate The first request message has been accepted, or the response message of the first request message is used to indicate that the requested content of the first request message has been accepted, and when the terminal receives the ACK, the unicast stream data can be sent, thereby avoiding the core.
  • the unicast stream data broadcast backhaul failure caused by the UPF broadcast backhaul is not ready.
  • the first request message includes: unicast stream information, where the unicast stream information is used to identify an uplink transmission path of the unicast stream data.
  • the core network can identify the uplink transmission path of the unicast stream data according to the unicast stream information, so that the association relationship between the uplink transmission path and the broadcast backhaul path of the unicast stream data can be established.
  • the first request message further includes at least one of broadcast stream information, communication area information, and local broadcast backhaul indication information, where the broadcast stream information is used to indicate a transmission path of the UPF local broadcast backhaul, and the communication area information is used by The local broadcast backhaul indication information is used to indicate that the UPF local broadcast backhaul is performed on the unicast stream data in the communication area indicating the UPF local broadcast backhaul.
  • broadcast stream information is used to indicate a transmission path of the UPF local broadcast backhaul
  • the communication area information is used by
  • the local broadcast backhaul indication information is used to indicate that the UPF local broadcast backhaul is performed on the unicast stream data in the communication area indicating the UPF local broadcast backhaul.
  • the core network may determine the transmission path and the communication area of the UPF local broadcast back according to the broadcast stream information and the communication area information, and no need to calculate the UPF local broadcast back according to other methods.
  • the transmission path and communication area of the transmission reduce the load of the core network.
  • the local broadcast backhaul indication information indicates that the UPF local broadcast backhaul is performed on the unicast stream data in an explicit manner, which further improves the reliability of the local broadcast backhaul.
  • the first request message further includes an identifier of a broadcast session management network element, where the broadcast session management network element is a network element that manages a broadcast session used by the UPF local broadcast backhaul.
  • the broadcast session management network element may be an SMF with a broadcast session management function or an independent network element.
  • a second aspect provides a method for transmitting data, including: receiving, by a SMF, a first request message from a terminal, where the first request message is used to request to perform UPF local broadcast backhaul on the unicast stream data; and the SMF sends the first request message to the terminal. A response message to the request message.
  • the terminal sends a first request message to the SMF to request to perform UPF local broadcast backhaul on the unicast stream data, so that the UPF of the unicast stream data sent by the terminal is received (the UPF is a unicast session)
  • the corresponding unicast stream data is no longer forwarded to the AS, but the received unicast stream data is forwarded to the UPF corresponding to the broadcast session locally (ie, the UPF corresponding to the broadcast session is also UPF broadcast back)
  • the UPF of the broadcast transmission path used by the transmission performs broadcast backhaul, which reduces the length of the transmission path of the unicast stream data, thereby reducing the transmission range required for a small transmission (for example, a transmission range corresponding to one PLMN, or one)
  • the response message is used to indicate that the first request message has been accepted.
  • the response message of the first request message may be, for example, an ACK or a NACK.
  • the response message of the first request message is used to indicate that the first request message has been accepted, or the first request The response message of the message is used to indicate that the content of the request of the first request message has been accepted.
  • the terminal receives the ACK, the unicast stream data can be sent, thereby avoiding the unicast caused by the core network not being ready for UPF broadcast backhaul. Stream data broadcast backhaul failed.
  • the first request message includes: unicast stream information, where the unicast stream information is used to identify an uplink transmission path of the unicast stream data.
  • the core network can identify the uplink transmission path of the unicast stream data according to the unicast stream information, so that the association relationship between the uplink transmission path and the broadcast backhaul path of the unicast stream data can be established.
  • the first request message further includes at least one of broadcast stream information, communication area information, and local broadcast backhaul indication information, where the broadcast stream information is used to indicate a transmission path of the UPF local broadcast backhaul, and the communication area information is used by The local broadcast backhaul indication information is used to indicate that the UPF local broadcast backhaul is performed on the unicast stream data in the communication area indicating the UPF local broadcast backhaul.
  • broadcast stream information is used to indicate a transmission path of the UPF local broadcast backhaul
  • the communication area information is used by
  • the local broadcast backhaul indication information is used to indicate that the UPF local broadcast backhaul is performed on the unicast stream data in the communication area indicating the UPF local broadcast backhaul.
  • the core network may determine the transmission path and the communication area of the UPF local broadcast back according to the broadcast stream information and the communication area information, and no need to calculate the UPF local broadcast back according to other methods.
  • the transmission path and communication area of the transmission reduce the load of the core network.
  • the local broadcast backhaul indication information indicates that the UPF local broadcast backhaul is performed on the unicast stream data in an explicit manner, which further improves the reliability of the UPF local broadcast backhaul.
  • the first request message further includes an identifier of the broadcast session management network element, where the broadcast session management network element is a network element that manages a broadcast session used by the UPF local broadcast backhaul.
  • the broadcast session management network element may be an SMF with a broadcast session management function or an independent network element.
  • the method further includes: determining, by the SMF, a broadcast session management network element, where the broadcast session management network element is a network element for managing a broadcast session used by the UPF broadcast backhaul; and the SMF is configured to the broadcast session management network element according to the first request message.
  • Sending a second request message where the second request message is used to obtain the information of the UPF that performs the UPF local broadcast backhaul; the SMF receives the response message of the second request message, and the response message of the second request message includes the identifier that performs the UPF local broadcast backhaul.
  • UPF information Sending a second request message, where the second request message is used to obtain the information of the UPF that performs the UPF local broadcast backhaul; the SMF receives the response message of the second request message, and the response message of the second request message includes the identifier that performs the UPF local broadcast backhaul.
  • the SMF After receiving the first request message, the SMF sends a second request message to the broadcast session management network element to obtain the information of the UPF that performs the UPF local broadcast backhaul.
  • the information of the UPF is, for example, the identifier of the UPF, so that the UPF request can be executed. UPF local broadcast backhaul.
  • the SMF determines the broadcast session management network element, where: when the first request message includes the identifier of the broadcast session management network element, the SMF determines the broadcast session management network element according to the identifier of the broadcast session management network element; or When the first request message does not include the identifier of the broadcast session management network element, the SMF determines the broadcast session management network element according to the preset rule.
  • the preset rule is, for example, selecting a broadcast session management network element that is closer to the terminal, or selecting a broadcast session management network element with a smaller load, or selecting a broadcast session management located at a central location of the communication area indicated by the terminal.
  • the network element therefore, the technical solution provided by this embodiment can flexibly select the broadcast session management network element.
  • the second request message includes unicast stream information.
  • the broadcast session management network element can identify the uplink transmission path of the unicast stream data according to the unicast stream information, so that the association relationship between the uplink transmission path and the broadcast backhaul path of the unicast stream data can be established.
  • the second request message further includes at least one of broadcast stream information, communication area information, and local broadcast backhaul indication information, where the broadcast stream information is used to indicate a transmission path of the UPF local broadcast backhaul, and the communication area information is used by The local broadcast backhaul indication information is used to indicate that the UPF local broadcast backhaul is performed on the unicast stream data in the communication area indicating the UPF local broadcast backhaul.
  • the broadcast session management network element may determine the transmission path and the communication area of the UPF local broadcast back according to the broadcast stream information and the communication area information, and no need to calculate the UPF according to other methods.
  • the transmission path and communication area of the local broadcast backhaul reduce the load of the broadcast session management network element.
  • the local broadcast backhaul indication information indicates that the UPF local broadcast backhaul is performed on the unicast stream data in an explicit manner, which further improves the reliability of the UPF local broadcast backhaul.
  • the method further includes: the SMF sending a third request message to the first UPF, the third request message is used to request to perform UPF local broadcast backhaul on the unicast stream data; and the SMF receives the third request from the first UPF The response message for the message.
  • the SMF may send a third request message to the first UPF, where the first UPF is a UPF for managing the unicast session, so that the first UPF requests the second UPF to perform the unicast stream data.
  • the UPF local broadcast backhaul, and the second UPF is a UPF that performs UPF local broadcast backhaul, so that UPF local broadcast backhaul can be implemented.
  • the third request message includes information of the UPF that performs UPF local broadcast backhaul and unicast stream information.
  • the information included in the third request message is used by the first UPF to encapsulate the unicast stream data and then send the unicast stream data to the second UPF, or the third request message includes The information is used by the first UPF to forward the unicast stream data directly to the second UPF after receiving the unicast stream data.
  • a third aspect provides a method for transmitting data, including: a first UPF receives a third request message from an SMF, and a third request message is used to perform a UPF local broadcast backhaul on the unicast stream data; The SMF sends a response message of the third request message.
  • the first UPF is a UPF for managing a unicast session. After receiving the third request message, the first UPF may request to perform a UPF local broadcast backhaul on the unicast stream data, and the second UPF is to perform a UPF local broadcast backhaul. UPF, which enables UPF local broadcast backhaul.
  • the third request message includes information of the UPF that performs UPF local broadcast backhaul and unicast stream information, where the unicast stream information is used to identify an uplink transmission path of the unicast stream data.
  • the information included in the third request message is used by the first UPF to encapsulate the unicast stream data and then send the unicast stream data to the second UPF, or the third request message includes The information is used by the first UPF to forward the unicast stream data directly to the second UPF after receiving the unicast stream data.
  • the method further includes: the first UPF receives the unicast stream data, and the first UPF sends the unicast stream data to the second UPF according to the information of the UPF that performs the UPF local broadcast backhaul, where the second UPF is performed by the UPF local Broadcast backhaul UPF.
  • a fourth aspect provides a method for transmitting data, including: a broadcast session management network element receives a second request message from an SMF, and a second request message is used to obtain information of a UPF that performs UPF local broadcast backhaul; broadcast session management The network element sends a response message of the second request message to the SMF, and the response message of the second request message includes information identifying the UPF that performs the UPF local broadcast backhaul.
  • the broadcast session management network element may be a broadcast SMF that manages the UPF local broadcast backhaul. After receiving the second request message from the SMF, the broadcast session management network element determines, according to the second request message, information of the UPF that performs the UPF local broadcast backhaul.
  • the information of the UPF is, for example, an identifier of the UPF, and the information of the UPF is sent to the SMF, so that the terminal requests the UPF local broadcast backhaul to the UPF.
  • the second request message includes unicast stream information, where the unicast stream information is used to identify an uplink transmission path of the unicast stream data.
  • the broadcast session management network element can identify the uplink transmission path of the unicast stream data according to the unicast stream information, so that the association relationship between the uplink transmission path and the broadcast backhaul path of the unicast stream data can be established.
  • the second request message further includes at least one of broadcast stream information, communication area information, and local broadcast backhaul indication information, where the broadcast stream information is used to indicate a transmission path of the UPF local broadcast backhaul, and the communication area information is used by The local broadcast backhaul indication information is used to indicate that the UPF local broadcast backhaul is performed on the unicast stream data in the communication area indicating the UPF local broadcast backhaul.
  • the broadcast session management network element may determine the transmission path and the communication area of the UPF local broadcast back according to the broadcast stream information and the communication area information, and no need to calculate the UPF according to other methods.
  • the transmission path and communication area of the local broadcast backhaul reduce the load of the broadcast session management network element.
  • the local broadcast backhaul indication information indicates that the UPF local broadcast backhaul is performed on the unicast stream data in an explicit manner, which further improves the reliability of the UPF local broadcast backhaul.
  • the method further includes: the broadcast session management network element performs an establishment or update operation of the broadcast session according to the second request message, where the broadcast session is a UPF local broadcast backhaul corresponding session.
  • the broadcast session management network element performs an establishment or update operation of the broadcast session according to the second request message, including:
  • the broadcast session management network element updates the broadcast session identified by the broadcast stream information according to the broadcast stream information.
  • the broadcast session management network element updates the broadcast session identified by the broadcast stream information according to the communication area information, and the communication area of the broadcast session is an area indicated by the communication area information;
  • the broadcast session management network element updates the broadcast session identified by the broadcast stream information according to the local broadcast backhaul indication information.
  • This embodiment can flexibly implement a broadcast session for updating or newly creating a broadcast stream identifier.
  • a fifth aspect provides a method for transmitting data, including: a second UPF receives unicast stream data from a first UPF, a second UPF is a UPF that performs UPF local broadcast backhaul; and a second UPF broadcasts back through the UPF.
  • the corresponding broadcast transmission path is transmitted to broadcast unicast stream data.
  • the method further includes: receiving, by the second UPF, broadcast session establishment information or broadcast session update information, where the broadcast session establishment information is used to request to establish a session corresponding to the UPF local broadcast backhaul, where the broadcast session update information is used by And requesting to update the session corresponding to the UPF local broadcast backhaul; establishing or updating the session corresponding to the UPF local broadcast back according to the broadcast session establishment information or the broadcast session update information.
  • the sixth aspect provides an apparatus for transmitting data, where the apparatus can implement the functions performed by the terminal in the method related to the first aspect, and the functions can be implemented by using hardware or by executing corresponding software by hardware.
  • the hardware or software includes one or more units or modules corresponding to the functions described above.
  • the apparatus includes a processor and a transceiver configured to support the apparatus to perform the corresponding functions of the above methods.
  • the transceiver is used to support communication between the device and other network elements.
  • the apparatus can also include a memory for coupling with the processor that retains the program instructions and data necessary for the apparatus.
  • the seventh aspect provides an apparatus for transmitting data, where the apparatus can implement the functions performed by the SMF in the method related to the second aspect, and the functions can be implemented by using hardware or by executing corresponding software by hardware.
  • the hardware or software includes one or more units or modules corresponding to the functions described above.
  • the apparatus includes a processor and a communication interface configured to support the apparatus to perform the corresponding functions of the above methods.
  • the communication interface is used to support communication between the device and other network elements.
  • the apparatus can also include a memory for coupling with the processor that retains the program instructions and data necessary for the apparatus.
  • the eighth aspect provides an apparatus for transmitting data, where the apparatus can implement the functions performed by the first UPF in the method related to the third aspect, and the functions can be implemented by using hardware or by executing corresponding software through hardware.
  • the hardware or software includes one or more units or modules corresponding to the functions described above.
  • the apparatus includes a processor and a communication interface configured to support the apparatus to perform the corresponding functions of the above methods.
  • the communication interface is used to support communication between the device and other network elements.
  • the apparatus can also include a memory for coupling with the processor that retains the program instructions and data necessary for the apparatus.
  • a ninth aspect provides an apparatus for transmitting data, where the apparatus can implement the functions performed by the broadcast session management network element in the method related to the fourth aspect, and the functions may be implemented by hardware, or may be performed by hardware.
  • Software Implementation The hardware or software includes one or more units or modules corresponding to the functions described above.
  • the apparatus includes a processor and a communication interface configured to support the apparatus to perform the corresponding functions of the above methods.
  • the communication interface is used to support communication between the device and other network elements.
  • the apparatus can also include a memory for coupling with the processor that retains the program instructions and data necessary for the apparatus.
  • a tenth aspect provides an apparatus for transmitting data, where the apparatus can implement the functions performed by the second UPF in the method related to the fifth aspect, and the functions can be implemented by using hardware or by executing corresponding software through hardware.
  • the hardware or software includes one or more units or modules corresponding to the functions described above.
  • the apparatus includes a processor and a communication interface configured to support the apparatus to perform the corresponding functions of the above methods.
  • the communication interface is used to support communication between the device and other network elements.
  • the apparatus can also include a memory for coupling with the processor that retains the program instructions and data necessary for the apparatus.
  • a network system comprising the apparatus for transmitting data according to the sixth aspect to the tenth aspect.
  • a computer program product comprising: computer program code, when the computer program code is run by a communication unit, a processing unit or a transceiver of a terminal, or a processor, causing the terminal to execute The method in each of the implementations of the first aspect above.
  • a computer program product comprising: computer program code, when the computer program code is executed by a communication unit, a processing unit or a communication interface of a SMF, and a processor, causing the SMF to execute The method in each of the implementations of the second aspect above.
  • a computer program product comprising: computer program code, when the computer program code is run by a first UPF communication unit, a processing unit or a communication interface, a processor
  • the first UPF performs the methods in the various implementations of the third aspect above.
  • a computer program product comprising: computer program code, when the computer program code is run by a communication unit, a processing unit or a communication interface, and a processor of a broadcast session management network element And causing the broadcast session management network element to perform the method in each implementation manner of the fourth aspect described above.
  • a computer program product comprising: computer program code, when the computer program code is run by a communication unit, a processing unit or a communication interface, or a processor of a second UPF,
  • the second UPF performs the methods in the various implementations of the fifth aspect above.
  • a computer storage medium for storing computer software instructions for use in the terminal, comprising a program designed to perform the method of the first aspect.
  • a computer storage medium for storing computer software instructions for use in the SMF described above, comprising a program designed to perform the method of the second aspect.
  • a computer storage medium for storing computer software instructions for use in the first UPF, comprising a program designed to perform the method of the third aspect.
  • a computer storage medium for storing computer software instructions for use in the broadcast session management network element, comprising a program designed to perform the method of the fourth aspect.
  • a computer storage medium for storing computer software instructions for use in the second UPF, comprising a program designed to perform the method of the fifth aspect.
  • FIG. 1 is a schematic diagram of a network architecture suitable for use in the present application
  • FIG. 2 is a schematic diagram of a method for transmitting data provided by the present application
  • FIG. 3 is a schematic diagram of another method for transmitting data provided by the present application.
  • FIG. 4 is a schematic diagram of still another method for transmitting data provided by the present application.
  • FIG. 5 is a schematic diagram of still another method for transmitting data provided by the present application.
  • FIG. 6 is a schematic diagram of still another method for transmitting data provided by the present application.
  • FIG. 7 is a schematic diagram of still another method for transmitting data provided by the present application.
  • FIG. 8 is a schematic diagram of still another method for transmitting data provided by the present application.
  • FIG. 9 is a schematic diagram of still another method for transmitting data provided by the present application.
  • FIG. 10 is a schematic diagram of still another method for transmitting data provided by the present application.
  • FIG. 11 is a schematic diagram of still another method for transmitting data provided by the present application.
  • FIG. 13 is a schematic structural diagram of another possible terminal provided by the present application.
  • FIG. 16 is a schematic structural diagram of a possible first UPF provided by the present application.
  • FIG. 17 is a schematic structural diagram of another possible first UPF provided by the present application.
  • FIG. 18 is a schematic structural diagram of a possible broadcast session management network element provided by the present application.
  • FIG. 19 is a schematic structural diagram of another possible broadcast session management network element provided by the present application.
  • FIG. 21 is a schematic structural diagram of another possible second UPF provided by the present application.
  • GSM global system of mobile communication
  • CDMA code division multiple access
  • WCDMA wideband code division multiple access
  • GPRS general packet radio service
  • LTE long term evolution
  • FDD frequency division duplex
  • TDD time division double Time division duplex
  • UMTS universal mobile telecommunication system
  • WiMAX worldwide interoperability for microwave access
  • a terminal in this application may refer to a user equipment, an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user device.
  • the terminal can also be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), and a wireless communication function.
  • the network architecture is a network architecture described from the perspective of a serviced interface. The following describes the network elements involved in the network architecture.
  • (radio) access network radio access network, (R)AN: used to provide network access functions for authorized users in a specific area, and can use different quality transmission tunnels according to user level, service requirements, and the like.
  • (R) AN network element can manage radio resources, provide access services for terminals, and then complete control signal and user data forwarding between the terminal and the core network.
  • (R) AN network element can also be understood as a base station in a traditional network. .
  • UPF User plane function
  • Data network (DN) network element A network for providing data transmission, for example, the Internet (Internet).
  • AUSF Authentication server function
  • access and mobility management function (AMF): mainly used for mobility management and access management, etc., can be used to implement mobility management entity (MME) functions in addition to session management Other functions, such as lawful interception and access authorization ⁇ authentication.
  • MME mobility management entity
  • Session management function mainly used for session management, network protocol (IP) address allocation and management of terminals, selection of manageable user plane functions, policy control and charging function interfaces. Endpoints and downstream data notifications, etc.
  • IP network protocol
  • Network exposure function used to securely open services and capabilities provided by 3GPP network functions to the outside.
  • Network repository function used to store network function entities and description information of services they provide, as well as support service discovery, network element entity discovery, and so on.
  • PCF Policy control function
  • Unified data management used to process user identification, access authentication, registration, and mobility management.
  • Application function used for data routing affected by the application, accessing the network open function network element, and interacting with the policy framework for policy control.
  • User equipment may include various handheld devices with wireless communication functions, in-vehicle devices, wearable devices, computing devices or other processing devices connected to the wireless modem, and various forms of terminals, mobile Mobile station (MS), terminal, soft terminal, etc., such as in-vehicle communication equipment, sensors, and the like.
  • MS mobile Mobile station
  • the N2 interface is a reference point of the (R)AN 120 and the AMF 160, and is used for sending a non-access stratum (NAS) message
  • the N3 interface is between (R) AN 120 and UPF 130. a reference point for transmitting data of the user plane, etc.
  • the N4 interface is a reference point between the SMF 170 and the UPF 130, and is used for transmitting, for example, N3 connection tunnel identification information, data buffer indication information, and downlink data notification message, etc.
  • N6 interface It is a reference point between UPF130 and DN140, used to transmit data of the user plane, and so on.
  • the foregoing network architecture applied to the embodiments of the present application is only an exemplary network architecture described from the perspective of a service architecture.
  • the network architecture applicable to the embodiment of the present application is not limited thereto, and any of the foregoing network elements can be implemented.
  • the functional network architecture is applicable to the embodiments of the present application.
  • network function entities such as AMF160, SMF170, PCF1110, and UDM1120 are called network functions (NF); or, in other network architectures, AMF160, SMF170, PCF1110, UDM1120, etc.
  • the collection of elements can be called the control plane function (CPF).
  • FIG. 2 is a schematic diagram of a method for transmitting data provided by the present application, and the method 200 includes:
  • the terminal sends a first request message to the SMF, where the first request message is used to request to perform UPF local broadcast backhaul on the unicast stream data.
  • the terminal may send a first request message to the SMF through the RAN and the AMF to request to perform UPF local broadcast backhaul on the unicast stream data.
  • the first request message may be a proprietary message, for example, a V2X transport channel request.
  • the first request message may also be other messages multiplexed, for example, a packet data unit (PDU) session modification request.
  • the terminal may multiplex other messages in an explicit or implicit manner.
  • the terminal may add indication information or information in a special format to the PDU session modification request.
  • the core network element receives the PDU session modification request including the indication information or the information of the special format, it may be determined that the terminal requests to perform UPF local broadcast backhaul on the unicast stream data.
  • the unicast stream data may be data over unicast flow or data transmitted through the QoS stream, and is not limited.
  • UPF local broadcast backhaul means that the uplink unicast stream data of the data transmission does not transmit to the outside of the communication network after reaching the UPF, but the UPF is used as the anchor point for the uplink and downlink data forwarding, and corresponds to the UPF.
  • the downlink broadcast transmission path is sent to other UEs.
  • the UPF that receives the unicast stream data in the uplink and the UPF that sends the stream data in the broadcast mode may not be the same UPF.
  • the terminal receives a response message of the first request message.
  • the terminal sends a first request message to the SMF to request to perform UPF local broadcast backhaul on the unicast stream data, so that the UPF of the unicast stream data sent by the terminal is received (the UPF is a unicast session)
  • the corresponding unicast stream data is no longer forwarded to the AS, but the received unicast stream data is forwarded to the UPF corresponding to the broadcast session locally (ie, the UPF corresponding to the broadcast session is also UPF broadcast back)
  • the UPF of the broadcast transmission path used by the transmission performs broadcast backhaul, which reduces the length of the transmission path of the unicast stream data, thereby reducing the transmission range required for a small transmission (for example, a transmission range corresponding to one PLMN, or one)
  • the response message is used to indicate that the first request message has been accepted.
  • the response message of the first request message may be an ACK or a NACK.
  • the response message of the first request message is ACK
  • the response message of the first request message is used to indicate that the first request message has been accepted, or the response message of the first request message is used to indicate the first request message.
  • the request content has been accepted.
  • the terminal receives the ACK the unicast stream data can be sent, thereby avoiding the unicast stream data broadcast backhaul failure caused by the core network element not being ready for UPF broadcast backhaul.
  • the first request message includes: unicast stream information, where the unicast stream information is used to identify an uplink transmission path of the unicast stream data.
  • the unicast stream information may include a session identifier (such as a PDU session ID) of the terminal, a flow identifier (such as a QoS flow identifier (QFI), or a 5G QoS identifier (5QI)), and At least one of unicast UPF tunnel identities.
  • a session identifier such as a PDU session ID
  • a flow identifier such as a QoS flow identifier (QFI), or a 5G QoS identifier (5QI)
  • At least one of unicast UPF tunnel identities such as a PDU session ID
  • a flow identifier such as a QoS flow identifier (QFI), or a 5G QoS identifier (5QI)
  • the unicast flow information when the unicast flow information includes the flow identifier, the unicast flow information may be used to indicate that the data of the flow corresponding to the flow identifier needs to be switched to the downlink broadcast transmission; when the unicast flow information only includes the session identifier, The unicast stream information may be used to indicate that the data of all the flows in the session corresponding to the session identifier needs to be switched to the downlink broadcast transmission; when the unicast flow information includes the UPF tunnel identifier, the unicast flow information may be used to indicate The data corresponding to the UPF tunnel identifier needs to be converted to the downlink broadcast transmission.
  • the core network can identify the unicast stream data based on the unicast stream information.
  • the first request message further includes at least one of broadcast stream information, MBS information, communication area information, and local broadcast backhaul indication information.
  • the broadcast stream information may be used to indicate a transmission path of the UPF local broadcast backhaul.
  • the broadcast stream information is a multimedia broadcast/multicast service SMF (MBS) session identifier (MBS Session ID) and/or an MBS bearer ID (MBS Bearer ID), where the MBS session identifier is also available.
  • MBS bearer identifier may also be referred to as a broadcast bearer identifier or a broadcast trail identifier or a broadcast stream identifier, and the broadcast stream identifier corresponds to a temporary mobile subscriber identity (TMGI) in the 4G communication system.
  • TMGI temporary mobile subscriber identity
  • the broadcast stream identifier corresponds to a TMGI and a flow ID in the 4G communication system.
  • the broadcast stream identifier is used to identify a group of users that receive the same service.
  • the users are located in a network area corresponding to the service, such as a cell, and a multimedia broadcast multicast service single frequency network (MBSFN).
  • Broadcast service area, etc. so the broadcast stream identification can also be understood as a network transmission area (or transmission path) for identifying service data.
  • the communication area information may be used to indicate a communication area of the UPF local broadcast backhaul, and may also be referred to as a broadcast area description information, which may be a service area identity (SAI) or an E-UTRAN cell global identifier (E- UTRAN cell global identifier (ECGI) or cell ID list, registration area (RA), tracing area (TA), local area data network service area, or geography Information such as the area (such as latitude and longitude) can also be the current position and radius distance of the terminal.
  • SAI service area identity
  • E- UTRAN cell global identifier E- UTRAN cell global identifier
  • RA registration area
  • TA tracing area
  • local area data network service area or geography Information
  • geography Information such as the area (such as latitude and longitude) can also be the current position and radius distance of the terminal.
  • E-UTRAN is an abbreviation for evolved UMTS terrestrial radio access network.
  • the local broadcast backhaul indication information may be used to indicate that the UPF local broadcast backhaul is performed on the unicast stream data, where the indication information may be one bit.
  • the uplink data used to indicate the SMF terminal does not have to be sent.
  • the indication information may further indicate that the SMF sends the uplink data of the terminal to the V2X server, and another copy is sent to the corresponding downlink broadcast transmission path transmission.
  • the core network element when the first request message includes broadcast stream information and/or communication area information, the core network element (which may be an SMF and a broadcast session management network element) may determine the UPF local according to the broadcast stream information and/or the communication area information.
  • the transmission path of the broadcast backhaul does not need to calculate the transmission path of the UPF local broadcast backhaul according to other methods, thereby reducing the load of the core network.
  • the local broadcast backhaul indication information may indicate that the UPF local broadcast backhaul is performed on the unicast stream data in an explicit manner, which further improves the reliability of the local broadcast backhaul.
  • the first request message further includes an identifier of the broadcast session management network element.
  • the identifier of the broadcast session management network element may be the name of the broadcast session management network element, FQDN, URL, URI, IP address, port number, and the like.
  • the SMF can find the broadcast session management network element and exchange signaling messages according to the identifier of the broadcast session management network element.
  • the broadcast session management network element may be a network element for managing a broadcast session used by the UPF local broadcast backhaul.
  • the broadcast session management network element may be an SMF with a broadcast session management function or an independent network element, such as an MBS.
  • FIG. 3 is a schematic diagram of another method for transmitting data provided by the present application.
  • the method 300 includes:
  • the SMF receives a first request message from the terminal, where the first request message is used to request to perform UPF local broadcast backhaul on the unicast stream data.
  • the first request message in the method 300 is the same as the first request message in the method 200, and details are not described herein again.
  • the first request message carries broadcast stream information or MBS information
  • the SMF sends the content included in the first request message to the MBS corresponding to the broadcast stream information or the MBS information.
  • the MBS information may be an identifier of the MBS (eg, the name, number, and Qualified Domain Name (FQDN) of the MBS), and the address of the MBS (eg, a Uniform Resource Identifier (URI), a unified resource. Locator (Uniform Resource Locator, URL), IPv4/IPv6 address, port number, or Media Access Control Address (MAC).
  • identifier of the MBS eg, the name, number, and Qualified Domain Name (FQDN) of the MBS
  • FQDN Qualified Domain Name
  • URI Uniform Resource Identifier
  • Locator Uniform Resource Locator
  • URL Uniform Resource Locator
  • IPv4/IPv6 address e.g., IPv4/IPv6 address
  • port number e.g., IP address, IPv4/IPv6 address, port number, or Media Access Control Address (MAC).
  • MAC Media Access Control Address
  • the first request message does not include an MBS session identifier or a broadcast bearer identifier or MBS information
  • the SMF selects an MBS according to a preset rule, and sends the request message to the selected MBS.
  • the MBS may determine the new broadcast bearer according to the communication area information carried in the first request message, or update the broadcast bearer according to the communication area information, and the MBS session identifier or the broadcast bearer identifier.
  • the SMF sends the newly created or updated broadcast bearer to the terminal.
  • the SMF may also receive other messages (eg, the terminal requests a broadcast bearer message), obtain communication area information or MBS session identifier or broadcast bearer identity or MBS information from the message, and establish or update a broadcast bearer.
  • the terminal requests a broadcast bearer message
  • obtain communication area information or MBS session identifier or broadcast bearer identity or MBS information from the message and establish or update a broadcast bearer.
  • the SMF may select an MBS according to the preset rule: select the MBS closest to the terminal according to the location of the terminal, or select a least loaded MBS according to the load of the MBS, or according to the communication carried in the first request message.
  • the area information selects one MBS, for example, the MBS located in the communication area corresponding to the communication area information and close to the center position of the communication area.
  • the SMF sends a response message of the first request message to the terminal.
  • the SMF receives the first request message from the terminal, and sends a response message of the first request message to the terminal, so that the UPF corresponding to the terminal unicast session no longer receives the unicast stream data of the received terminal.
  • the transmission length of the unicast stream data is reduced, thereby reducing the transmission delay of the unicast stream data.
  • the response message is used to indicate that the first request message has been accepted.
  • the response message is used to indicate that the first request message has been accepted.
  • the method 300 further includes:
  • the SMF determines a broadcast session management network element.
  • This step (S330) is an optional step, wherein the broadcast session management network element may be a network element for managing a broadcast session used by the UPF broadcast backhaul.
  • the SMF sends a second request message to the broadcast session management network element according to the first request message, where the second request message is used to obtain the information of the UPF that performs the UPF local broadcast backhaul.
  • the information of the UPF that performs the UPF local broadcast backhaul may be used to indicate the UPF that performs the UPF local broadcast backhaul, and may be the identifier of the UPF that performs the UPF local broadcast backhaul, such as an address, or a name.
  • the SMF receives the response message of the second request message, where the response message of the second request message includes information that identifies the UPF that performs the UPF local broadcast backhaul.
  • the second request message may be a V2V transport channel request.
  • the SMF after receiving the first request message, the SMF sends a second request message to the broadcast session management network element to obtain the information of the UPF that performs the UPF local broadcast backhaul.
  • the information of the UPF is, for example, the identifier of the UPF, and the UPF The identifier can be the address of the UPF or the name of the UPF.
  • step S330 can adopt the following two implementation manners:
  • Manner 1 When the first request message includes the identifier of the broadcast session management network element, the SMF determines the broadcast session management network element according to the identifier of the broadcast session management network element.
  • the foregoing preset rule may be: selecting a broadcast session management network element closest to the terminal, or selecting a broadcast session management network element with the smallest load, or selecting a broadcast session management located at a central location of the communication area indicated by the terminal.
  • the network element therefore, the technical solution provided by this embodiment can flexibly select the broadcast session management network element.
  • the second request message includes the unicast stream information.
  • the unicast stream information For details, refer to the related description in the embodiment shown in FIG. 2, and details are not described herein.
  • the broadcast session management network element can create a broadcast session according to the unicast stream information, create a broadcast transmission path for the UPF local broadcast backhaul, and obtain information of the UPF of the local broadcast backhaul.
  • a description of the unicast stream information can be referred to the related description in method 200.
  • the second request message further includes at least one of broadcast stream information, communication area information, and local broadcast backhaul indication information, where the broadcast stream information is used to indicate a broadcast transmission path of the UPF local broadcast backhaul, and the communication area information A communication area for indicating a UPF local broadcast backhaul, and the local broadcast backhaul indication information is used to indicate that UPF local broadcast backhaul is performed on the unicast stream data.
  • broadcast stream information is used to indicate a broadcast transmission path of the UPF local broadcast backhaul
  • the communication area information A communication area for indicating a UPF local broadcast backhaul
  • the local broadcast backhaul indication information is used to indicate that UPF local broadcast backhaul is performed on the unicast stream data.
  • the broadcast session management network element may determine the transmission path and the communication area of the UPF local broadcast back according to the broadcast stream information and the communication area information, and no need to calculate the UPF local according to other methods.
  • the transmission path and communication area of the broadcast backhaul reduce the load of the broadcast session management network element.
  • the local broadcast backhaul indication information indicates that the UPF local broadcast backhaul is performed on the unicast stream data in an explicit manner, which further improves the reliability of the UPF local broadcast backhaul.
  • the method 300 further includes:
  • the SMF sends a third request message to the first UPF, where the third request message is used to request to perform UPF local broadcast backhaul on the unicast stream data.
  • the first UPF is a UPF corresponding to the unicast session.
  • the third request message may be an uplink-downlink connection request (UL-DL link request) or an N4 session modification request (N4 session modification request), which is not limited.
  • the SMF receives a response message of the third request message from the first UPF.
  • the SMF sends a third request message to the UPF corresponding to the unicast session, so that the network side performs the UPF local broadcast backhaul on the unicast stream data, that is, the UPF corresponding to the unicast session sends the unicast stream data of the received terminal to the first
  • the second UPF, the second UPF performs local broadcast backhaul on the received data
  • the second UPF is a UPF that performs UPF local broadcast backhaul, so that UPF local broadcast backhaul can be implemented.
  • the third request message includes information of the UPF that performs UPF local broadcast backhaul and unicast stream information.
  • the UPF information and the unicast stream information of the UPF local broadcast refer to the related description in the method 200, and details are not described herein again.
  • the information of the UPF that performs local broadcast backhaul and the unicast stream information included in the third request message may be used by the first UPF to perform the unicast stream data after receiving the unicast stream data.
  • the information and the unicast stream information of the UPF that is performed by the third request message to perform the local broadcast backhaul may be The first UPF forwards the unicast stream data directly to the second UPF after receiving the unicast stream data.
  • FIG. 4 is a schematic diagram of still another method for transmitting data provided by the present application.
  • the method 400 includes:
  • the first UPF receives a third request message from the SMF, and the third request message is used to request to perform UPF local broadcast backhaul on the unicast stream data.
  • the third request message in the method 400 is the same as the third request message in the method 300, and details are not described herein.
  • the first UPF sends a response message of the third request message to the SMF.
  • the first UPF may be a UPF that manages the unicast session, that is, the UPF that receives the unicast stream data of the UE. After receiving the third request message, the first UPF determines to perform the unicast stream data according to the indication of the third request message.
  • the UPF local broadcast backhaul and when the unicast stream data is received, the first UPF performs the UPF local backhaul process, that is, sends the received data to the second UPF (that is, performs the UPF local broadcast backhaul).
  • UPF the second UPF can send the unicast stream data to other UEs through the broadcast path, thereby implementing UPF local broadcast backhaul.
  • the third request message includes the information of the UPF that performs the UPF local broadcast backhaul and the unicast stream information, where the unicast stream information is used to identify the unicast stream data.
  • the information of the UPF and the unicast stream information of the UPF local broadcast backhaul included in the third request message may be used by the first UPF to receive the unicast stream data after the unicast stream is received.
  • the data is encapsulated and sent to the UPF (which may be referred to as a second UPF) that performs UPF local broadcast backhaul.
  • the information of the UPF and the unicast stream information of the UPF local broadcast backhaul included in the third request message may be used by the first UPF to directly direct the unicast stream data after receiving the unicast stream data. Forward to the second UPF.
  • method 400 further includes:
  • the first UPF receives the unicast stream data.
  • the first UPF sends the unicast stream data to the second UPF according to the information of the UPF that performs the UPF local broadcast backhaul in the third request message.
  • the second UPF is the UPF corresponding to the information of the UPF that is broadcast back by the UPF, that is, the UPF that performs the UPF local broadcast backhaul.
  • the first UPF after receiving the unicast stream data, the first UPF encapsulates the unicast stream data and sends the data to the second UPF, or the first UPF sends the unicast stream data after receiving the unicast stream data. Directly forwarded to the second UPF, so that the UPF local backhaul broadcast can be performed on the information to be processed without going through the processing of the AS.
  • FIG. 5 is a schematic diagram of still another method for transmitting data provided by the present application.
  • the method 500 includes:
  • the broadcast session management network element receives the second request message from the SMF, where the second request message is used to obtain information about the UPF that performs the UPF local broadcast backhaul.
  • the broadcast session management network element sends a response message of the second request message to the SMF, where the response message of the second request message includes information of the UPF that performs UPF local broadcast backhaul.
  • the broadcast session management network element may be an SMF corresponding to a broadcast session of the UPF local broadcast backhaul, or may be an independent network element, for example, an MBS.
  • the broadcast session management network element receives the second request message from the SMF, and sends the UPF information of the UPF local broadcast backhaul to the SMF according to the second request message, so that the SMF will perform the UPF.
  • the UPF information of the local broadcast back is sent to the unicast UPF to implement the UPF local broadcast backhaul.
  • the UPF information of the UPF local broadcast backhaul may be the UPF of the UPF local broadcast backhaul obtained during the new or updated broadcast session.
  • the information of the UPF that performs the UPF local broadcast backhaul is, for example, the identifier of the UPF, and the identifier of the UPF may be the address of the UPF or the name of the UPF.
  • the second request message includes unicast stream information, and the unicast stream information is used to identify unicast stream data.
  • the second request message further includes at least one of broadcast stream information, communication area information, and local broadcast backhaul indication information, where the broadcast stream information is used to indicate a transmission path of the UPF local broadcast backhaul, and the communication area information is used by The local broadcast backhaul indication information is used to indicate that the UPF local broadcast backhaul is performed on the unicast stream data in the communication area indicating the UPF local broadcast backhaul.
  • the method further includes: when the second request message includes the broadcast stream information and the communication area information, the broadcast session management network element determines the transmission path and the communication area of the UPF local broadcast back according to the broadcast stream information and the communication area information.
  • the broadcast stream information indicates a transmission path
  • the communication area information indicates a communication area.
  • the broadcast session management network element may determine a transmission path of the UPF local broadcast back according to the broadcast stream information, and determine a communication area of the UPF local broadcast back according to the communication area information, without further
  • the transmission path and the communication area of the UPF local broadcast backhaul are calculated according to other methods, and the load of the broadcast session management network element is reduced.
  • the local broadcast backhaul indication information indicates that the UPF local broadcast backhaul is performed on the unicast stream data in an explicit manner, which further improves the reliability of the UPF local broadcast backhaul.
  • the 500 method further includes:
  • the broadcast session management network element performs an establishment or update operation of the broadcast session according to the second request message, where the broadcast session is a UPF local broadcast backhaul corresponding session.
  • S530 includes:
  • the broadcast session management network element newly establishes a broadcast session of the broadcast session update broadcast stream information according to the broadcast stream information;
  • the broadcast session management network element newly creates or updates a broadcast session identified by the broadcast stream information according to the communication area information, and the communication area of the broadcast session is an area indicated by the communication area information; or
  • the broadcast session management network element creates a new broadcast session or updates the broadcast session identified by the broadcast stream information according to the local broadcast backhaul indication information.
  • the foregoing solution can flexibly implement a new broadcast session or update a broadcast session of the broadcast stream identifier, and change the communication area.
  • FIG. 6 is a schematic diagram of still another method for transmitting data provided by the present application.
  • the method 600 includes:
  • the second UPF receives the unicast stream data from the first UPF, and the second UPF is the UPF that performs the UPF local broadcast backhaul.
  • S620 The second UPF broadcasts the corresponding broadcast transmission path by using the UPF local broadcast, and broadcasts data corresponding to the unicast stream.
  • the method provided by the foregoing embodiment after the first UPF determines to perform the UPF local broadcast backhaul, sends the unicast stream data to the second UPF, and no longer sends the unicast stream data to the V2X server, where the second UPF is to perform the UPF local broadcast back.
  • the UPF is transmitted so that the UPF local broadcast backhaul can be implemented.
  • the method 600 further includes:
  • the second UPF receives a broadcast session setup message or a broadcast session update message, where the broadcast session setup message is used to request to establish a broadcast transmission path corresponding to the UPF local broadcast backhaul, where the broadcast session update message is used to request to update the UPF local broadcast.
  • the corresponding broadcast transmission path is returned. among them,
  • FIG. 7 is a schematic flowchart of a method for transmitting data provided by the present application.
  • the UE is only one example of a terminal that communicates with the AMF or RAN, and the terminal that communicates with the AMF or RAN may also be an in-vehicle communication device.
  • Method 700 includes:
  • the UE determines to change the transmission range according to the current V2X service characteristics (such as the type of the V2X message or the type of the V2X application).
  • the UE sends an MBMS bearer setup request message to the SMF (the request message may also be referred to as a UE requested MBMS bearer), and the MBMS is an abbreviation of a multimedia broadcast/multicast service. Includes communication area information.
  • the communication area information is used to indicate the range of communication, and may also be referred to as broadcast area description information, which may be a service area identity (SAI), an E-UTRAN cell global identifier (ECGI), or Cell ID list, registration area (RA), tracing area (TA), local area data network service area, geographic area (such as latitude and longitude), etc. It can be the current position of the UE and the radius distance.
  • SAI service area identity
  • ECGI E-UTRAN cell global identifier
  • TA tracing area
  • the SMF sends the message to the broadcast session network element (MBS as shown in Figure 7).
  • the MBMS bearer setup request message may also carry an MBS session identifier (MBS session ID) or a broadcast bearer identifier (corresponding to a temporary mobile group in the 4G communication system).
  • MBS session ID MBS session identifier
  • broadcast bearer identifier corresponding to a temporary mobile group in the 4G communication system.
  • the Temporary Mobile Subscriber Identity (TMGI), or the temporary mobile group identifier and the Flow ID corresponding to the 4G communication system, may also be referred to as a broadcast stream identifier, which is used to identify a group of users receiving the same service, and these users are generally located.
  • TMGI Temporary Mobile Subscriber Identity
  • the network area corresponding to the service can also understand a network transmission area (or a transmission path) for identifying service data.
  • the MBMS bearer setup request message can also be used.
  • Carry MBS information for example, MBS identifier (such as MBS name, number, Fully Qualified Domain Name (FQDN), address (Uniform Resource Identifier, URI), Uniform Resource Locator , URL), IPv4/IPv6 address, port number, media access control address (Media Access Control Address The MAC)), etc.
  • MBS identifier such as MBS name, number, Fully Qualified Domain Name (FQDN), address (Uniform Resource Identifier, URI), Uniform Resource Locator , URL), IPv4/IPv6 address, port number, media access control address (Media Access Control Address The MAC)), etc.
  • the network side performs a broadcast bearer update or a broadcast bearer setup process. For example, if the request message of the S701 carries the MBS session identifier or the broadcast bearer identifier or the MBS information, the SMF forwards the request to the MBS session identifier or the MBS corresponding to the broadcast bearer identifier or the MBS information. If the request message of S701 does not include the MBS session identifier or the broadcast bearer identifier or the MBS information, the SMF selects an MBS according to the preset rule, and forwards the request message to the selected MBS.
  • the MBS After receiving the request, the MBS determines to create a new broadcast bearer or update the broadcast bearer according to the communication area information and the MBS session identifier or the broadcast bearer identifier or the MBS information, and sends the newly added or updated broadcast bearer to the UE.
  • the foregoing SMF may select one MBS according to a preset rule: select an MBS that is closer to the current location of the UE according to the location of the UE, or select an MBS with the lightest MBS load according to the MBS load, or select a location located in the communication area according to the communication area information and MBS near the center. If the MBMS bearer setup request message in S701 does not include the communication area information, the SMF may select one MBS according to the first two preset rules.
  • the UE determines, according to the current V2X service characteristic (such as the type of the V2X message or the type of the V2X application), the uplink transmission broadcast downlink transmission mode, and the UE sends a V2X transport channel request (V2X transport channel request) to the SMF, where the V2X transmission is performed.
  • the V2X transport channel request is a first request message, and the V2X transport channel request includes unicast stream information, and may further include at least one of broadcast stream information and UPF local broadcast backhaul indication information.
  • the above broadcast stream information is, for example, an MBS Session ID (MBS Session ID) and/or an MBS Bearer ID (MBS Bearer ID).
  • the unicast stream information may include at least one of an uplink session identifier (such as a PDU session ID), a flow identifier (such as QoS Flow ID, QFI, or 5G QoS Identifier, 5QI), and a unicast UPF tunnel identifier, if the unicast stream
  • the information includes a flow identifier, and the unicast flow information is used to indicate that the data of the flow corresponding to the flow identifier needs to be switched to the downlink broadcast transmission; if the unicast flow information only includes the session identifier, the unicast flow information is used to indicate the session.
  • the unicast flow information is used to indicate that the data corresponding to the UPF tunnel identifier needs to be converted to the downlink broadcast, if the unicast flow information includes the UPF tunnel identifier, and the data of all the flows in the corresponding session needs to be switched to the downlink broadcast. transmission.
  • the UPF local broadcast backhaul indication information is used to indicate that the uplink data of the UE of the SMF does not have to be sent to the V2X server (ie, the V2X AS), and may be directly transferred to the corresponding broadcast path for downlink transmission. In another optional implementation manner, the UPF local broadcast backhaul indication information may indicate that the uplink data of the UE is sent to the V2X server, and another copy is sent to the corresponding broadcast path downlink transmission.
  • the SMF sends a V2X transport channel request (V2X transport channel request) to the MBS, that is, a second request message, where the V2X transport channel request is used to request to acquire UPF information of the broadcast session.
  • V2X transport channel request may include unicast stream information, and may further include at least one of broadcast stream information and UPF local broadcast backhaul indication information.
  • the MBS returns a V2X transport channel response (V2X transport channel response) to the SMF, where the V2X transport channel response is a response message of the second request message, where the V2X transport channel response includes broadcast UPF information (UPF (multicast) info).
  • the broadcast UPF information is used to identify the broadcast UPF, and the broadcast UPF is the UPF that performs the UPF local broadcast backhaul.
  • the broadcast UPF information may include at least one of the following information: the tunnel identifier of the broadcast UPF, and the broadcast UPF. Address, broadcast user plane address, and port number (for unicast UPF encapsulated packets).
  • the MBS establishes/updates the broadcast session in S702 to obtain the information of the above broadcast UPF.
  • the SMF sends an uplink-downlink connection request (UL-DL link request) to the unicast UPF (also referred to as a first UPF), where the uplink-to-downlink connection request is a third request message, and the uplink-to-downlink connection request includes a broadcast.
  • the UPF information and the unicast flow information are used for requesting local breakout of the uplink data to the broadcast downlink, that is, requesting UPF local broadcast backhaul. If the unicast stream information in S703 is a stream identifier, the unicast stream information in S706 is the stream identifier in S703.
  • the unicast stream information in S706 may be The identifier of all the flows corresponding to the session identifier may be replaced by the core network (CN) tunnel identifier corresponding to the session identifier.
  • CN core network
  • the unicast UPF After receiving the uplink-downlink connection request, the unicast UPF forwards the data to the broadcast UPF if the uplink data corresponding to the UE is subsequently received.
  • the uplink-to-downlink connection request may further include: the UPF local broadcast backhaul indication information is used to indicate that the uplink data of the UE is not sent to the V2X server (ie, the V2X AS), and may be directly transferred to the corresponding downlink broadcast path transmission.
  • the UPF local broadcast backhaul indication information may indicate that the uplink data of the UE is sent to the V2X server, and another copy is sent to the corresponding broadcast path for downlink transmission.
  • the unicast UPF sends data to the V2X server in addition to forwarding the data to the broadcast UPF.
  • the unicast UPF sends an uplink-downlink response (UL-DL link response) to the SMF, that is, a response message of the third request message, where the response information is used to confirm that the unicast UPF accepts the request of the third request message.
  • UL-DL link response uplink-downlink response
  • the SMF sends a V2X transport channel response (V2X transport channel response) to the UE, where the V2X transport channel response is a response message of the first request message, for confirming that the first request message is successfully processed.
  • V2X transport channel response is a response message of the first request message
  • the UE sends the uplink V2X message to the unicast UPF, and the unicast UPF encapsulates or forwards the data packet, and sends the uplink V2X message to the broadcast UPF.
  • the broadcast UPF sends the V2X message to other UEs through the broadcast transmission path.
  • the above-mentioned encapsulation refers to that the unicast UPF sends the received uplink V2X message to the broadcast UPF by using the broadcast user plane address and the port number.
  • the forwarding refers to the unicast UPF sending the uplink V2X message to the broadcast UPF, and receiving by the broadcast UPF.
  • the upstream V2X message is encapsulated.
  • the signaling interaction between the SMF and the MBS is an internal implementation and can be omitted. If the unicast UPF and the broadcast UPF are combined, S709 is an internal implementation. The above steps can be performed at intervals.
  • FIG. 8 is a schematic flowchart of another method for transmitting data provided by the present application.
  • the UE is only one example of a terminal that communicates with the AMF or RAN, and the terminal that communicates with the AMF or RAN may also be an in-vehicle communication device.
  • Method 800 includes:
  • the UE determines to change the transmission range according to the current V2X service characteristic (such as the type of the V2X message or the type of the V2X application). Then, the UE sends a V2X transport channel request to the SMF, where the V2X transport channel request is a first request message, and the V2X transport channel request includes unicast stream information, and may also include broadcast stream information, communication area information, and UPF local. Broadcasting at least one of the indication information.
  • the above broadcast stream information is, for example, an MBS Session ID (MBS Session ID) and/or an MBS Bearer ID (MBS Bearer ID).
  • the unicast stream information may include at least one of an uplink session identifier (such as a PDU session ID), a flow identifier, and a unicast UPF tunnel identifier (such as QoS Flow ID, QFI, or 5G QoS Identifier, 5QI), if the unicast stream
  • the information includes a flow identifier, and the unicast flow information is used to indicate that the data of the flow corresponding to the flow identifier needs to be switched to the downlink broadcast transmission; if the unicast flow information only includes the session identifier, the unicast flow information is used to indicate the session.
  • the unicast flow information is used to indicate that the data corresponding to the UPF tunnel identifier needs to be converted to the downlink broadcast, if the unicast flow information includes the UPF tunnel identifier, and the data of all the flows in the corresponding session needs to be switched to the downlink broadcast. transmission.
  • the UPF local broadcast backhaul indication information is used to indicate that the uplink data of the UE of the SMF does not have to be sent to the V2X server (ie, the V2X AS), and may be directly transferred to the corresponding broadcast path for downlink transmission. In another optional implementation manner, the UPF local broadcast backhaul indication information may indicate that the uplink data of the UE is sent to the V2X server, and another copy is sent to the corresponding broadcast path downlink transmission.
  • the foregoing communication area information is used to indicate a range of communication, and may also be referred to as a broadcast area description information, which may be a service area identity (SAI) or an E-UTRAN cell global identifier (ECGI). Or a cell ID list, a registration area (RA), a tracing area (TA), a local area data network service area, a geographic area (such as latitude and longitude), It can also be the current location and radius distance of the UE.
  • SAI service area identity
  • ECGI E-UTRAN cell global identifier
  • RA registration area
  • TA tracing area
  • local area data network service area a geographic area (such as latitude and longitude)
  • MCS broadcast session network element
  • a broadcast stream identifier is used to identify a group of users that receive the same service. Generally, these users are located in network areas corresponding to the service, such as a cell, a MBSFN, a broadcast service area, etc., so that a network for identifying service data can also be understood.
  • the V2X transport channel request may also carry an MBS session identifier (MBS session ID) or a broadcast bearer identifier (which may also be referred to as a broadcast stream identifier).
  • the V2X transport channel request may also carry MBS information (for example, MBS identification (such as MBS name, number, Fully Qualified Domain Name (FQDN), address (Uniform Resource Identifier, URI), Uniform Resource Locator (Uniform Resource Locator, URL), IPv4/IPv6 address, port number, Media Access Control Address (MAC), etc. ), used by the SMF to send signaling messages to the MBS.
  • MBS identification such as MBS name, number, Fully Qualified Domain Name (FQDN), address (Uniform Resource Identifier, URI), Uniform Resource Locator (Uniform Resource Locator, URL), IPv4/IPv6 address, port number, Media Access Control Address (MAC), etc.
  • the SMF sends a V2X transport channel request (V2X transport channel request) to the MBS, that is, a second request message, where the V2X transport channel request is used to request to acquire UPF information of the broadcast session.
  • V2X transport channel request may include unicast stream information, and may further include at least one of broadcast stream information, unicast stream information, and UPF local broadcast backhaul indication information.
  • the network side performs a broadcast bearer update or a broadcast bearer setup process. For example, if the request message of the S801 carries the MBS session identifier or the broadcast bearer identifier or the MBS information, the SMF forwards the request to the MBS session identifier or the MBS corresponding to the broadcast bearer identifier or the MBS information. If the request message of S801 does not include the MBS session identifier or the broadcast bearer identifier or the MBS information, the SMF selects an MBS according to the preset rule, and forwards the request message to the selected MBS.
  • the MBS After receiving the request, the MBS determines to create a new broadcast bearer or update the broadcast bearer according to the communication area information and the MBS session identifier or the broadcast bearer identifier or the MBS information, and sends the newly generated or updated broadcast bearer to the UE.
  • the foregoing SMF may select one MBS according to a preset rule: select an MBS that is closer to the current location of the UE according to the location of the UE, or select an MBS with the lightest MBS load according to the MBS load, or select a location located in the communication area according to the communication area information and MBS near the center. If the V2X transmission channel request in S801 does not include the communication area information, the SMF may select one MBS according to the first two preset rules.
  • the MBS returns a V2V transport channel response (V2V transport channel response) to the SMF, where the V2X transport channel response is a response message of the second request message, where the V2X transport channel response includes broadcast UPF information (UPF (multicast) info).
  • the broadcast UPF information is used to identify the broadcast UPF, and the broadcast UPF is the UPF that performs the UPF local broadcast backhaul.
  • the broadcast UPF information may include at least one of the following information: the tunnel identifier of the broadcast UPF, and the broadcast UPF. Address, broadcast user plane address, and port number (for unicast UPF encapsulated packets).
  • the MBS establishes/updates the broadcast session in S803 to obtain the information of the above broadcast UPF.
  • the SMF sends an uplink-downlink connection request (UL-DL link request) to the unicast UPF (also referred to as a first UPF), where the uplink-to-downlink connection request is a third request message, and the uplink-to-downlink connection request includes a broadcast.
  • the UPF information and the unicast flow information are used for requesting local breakout of the uplink data to the broadcast downlink, that is, requesting UPF local broadcast backhaul. If the unicast stream information in S801 is a stream identifier, the unicast stream information in S505 is the stream identifier in S805.
  • the unicast stream information in S805 may be The identifier of all the flows corresponding to the session identifier may be replaced by the core network (CN) tunnel identifier corresponding to the session identifier.
  • CN core network
  • the unicast UPF After receiving the uplink-downlink connection request, the unicast UPF forwards the data to the broadcast UPF if the uplink data corresponding to the UE is subsequently received.
  • the uplink-to-downlink connection request may further include: the UPF local broadcast backhaul indication information is used to indicate that the uplink data of the UE is not sent to the V2X server (ie, the V2X AS), and may be directly transferred to the corresponding downlink broadcast path transmission.
  • the UPF local broadcast backhaul indication information may indicate that the uplink data of the UE is sent to the V2X server, and another copy is sent to the corresponding broadcast path for downlink transmission.
  • the unicast UPF sends data to the V2X server in addition to forwarding the data to the broadcast UPF.
  • the unicast UPF sends an uplink-downlink response (UL-DL link response) to the SMF, that is, a response message of the third request message, where the response information is used to confirm that the unicast UPF accepts the request of the third request message.
  • UL-DL link response uplink-downlink response
  • the SMF sends a V2X transport channel response (V2X transport channel response) to the UE, where the V2X transport channel response is a response message of the first request message, and is used to confirm that the first request message is successfully processed.
  • V2X transport channel response is a response message of the first request message
  • the UE sends the uplink V2X message to the unicast UPF, and the unicast UPF encapsulates or forwards the data packet, and sends the uplink V2X message to the broadcast UPF.
  • the broadcast UPF sends the V2X message to other UEs through the broadcast transmission path.
  • the above-mentioned encapsulation refers to that the unicast UPF sends the received uplink V2X message to the broadcast UPF by using the broadcast user plane address and the port number.
  • the forwarding refers to the unicast UPF sending the uplink V2X message to the broadcast UPF, and receiving by the broadcast UPF.
  • the upstream V2X message is encapsulated.
  • SMF and the MBS are combined, the signaling interaction between the SMF and the MBS is an internal implementation and can be omitted. If the unicast UPF and the broadcast UPF are combined, S808 is an internal implementation. The various steps described above can be performed at intervals.
  • FIG. 9 is a schematic flowchart of still another method for transmitting data provided by the present application.
  • the UE is only one example of a terminal that communicates with the AMF or RAN, and the terminal that communicates with the AMF or RAN may also be an in-vehicle communication device.
  • Method 900 includes:
  • the UE determines to change the transmission range according to the current V2X service characteristic (such as the type of the V2X message or the type of the V2X application).
  • the UE sends a packet data unit (PDU) session modification request to the SMF, where the request is a first request message, and the request includes unicast stream information, and may also include broadcast stream information and communication area information. And at least one of UPF local broadcast return indication information.
  • the above broadcast stream information is, for example, an MBS Session ID (MBS Session ID) and/or an MBS Bearer ID (MBS Bearer ID).
  • the unicast stream information may include at least one of an uplink session identifier, a flow identifier, and a unicast UPF tunnel identifier.
  • the unicast stream information includes a flow identifier
  • the unicast stream information is used to indicate the flow identifier. The corresponding stream needs to be switched to the downlink broadcast transmission.
  • the unicast stream information only includes the session ID
  • the unicast stream information is used to indicate that all the flows in the session corresponding to the session identifier need to be switched to the downlink broadcast transmission.
  • the unicast stream information includes the UPF tunnel identifier
  • the unicast stream information is used to indicate that the data corresponding to the UPF tunnel identifier needs to be converted to the downlink broadcast transmission.
  • the UPF local broadcast backhaul indication information is used to indicate that the uplink data of the UE of the SMF does not have to be sent to the V2X server (ie, the AS), and may directly go to the corresponding downlink broadcast.
  • the UPF local broadcast backhaul indication information may indicate that the uplink data of the UE is sent to the V2X server, and another copy is sent to the corresponding broadcast path downlink transmission.
  • the foregoing communication area information is used to indicate a range of communication, and may also be referred to as a broadcast area description information, which may be a service area identity (SAI) or an E-UTRAN cell global identifier (ECGI). Or a cell ID list, a registration area (RA), a tracing area (TA), a local area data network service area, a geographic area (such as latitude and longitude), It can also be the current location of the UE + radius distance.
  • SAI service area identity
  • ECGI E-UTRAN cell global identifier
  • RA registration area
  • TA tracing area
  • local area data network service area a geographic area (such as latitude and longitude)
  • MMS broadcast session network element
  • the V2X transport channel request may also carry an MBS session identifier (MBS session ID) or a broadcast bearer identifier (which may also be referred to as a broadcast stream identifier), optionally
  • MBS session ID MBS session ID
  • broadcast bearer identifier which may also be referred to as a broadcast stream identifier
  • MBS information eg, the identifier, address, name, etc. of the MBS
  • the SMF may determine the role of the message according to one or more of the broadcast stream information, the communication area information, and the UPF local broadcast backhaul indication information to take corresponding actions.
  • the SMF sends a V2X transport channel request (ie, a second request message) to the MBS, where the V2X transport channel request is used to obtain UPF information of the broadcast session, where the UPF is a UPF of a broadcast transmission path used by the UPF local broadcast backhaul.
  • the V2X transport channel request may include unicast stream information, and may further include at least one of broadcast stream information, unicast stream information, and UPF local broadcast backhaul indication information.
  • the MBS may determine the role of the V2X transport channel request based on the UPF local broadcast backhaul indication information and/or the type of message requested by the V2X transport channel.
  • the SMF forwards the request to the MBS session identifier or the MBS corresponding to the broadcast bearer identifier or the MBS information. If the request message of S901 does not include the MBS session identifier or the broadcast bearer identifier or the MBS information, the SMF selects an MBS according to the preset rule, and forwards the request message to the selected MBS.
  • the MBS After receiving the request, the MBS determines to create a new broadcast bearer or update the broadcast bearer according to the communication area information and the MBS session identifier or the broadcast bearer identifier or the MBS information, and sends the newly added or updated broadcast bearer to the UE.
  • the foregoing SMF may select one MBS according to a preset rule: select an MBS that is closer to the current location of the UE according to the location of the UE, or select an MBS with the lightest MBS load according to the MBS load, or select a location located in the communication area according to the communication area information and MBS near the center. If the MBMS bearer setup request message in S901 does not include the communication area information, the SMF may select one MBS according to the first two preset rules.
  • the MBS After receiving the V2X transmission channel request, the MBS determines, according to the communication area information, that a new broadcast bearer is to be established (where the V2X transport channel request does not carry broadcast stream information or MBS information) or that the broadcast bearer is to be updated (where the V2X transport channel is updated).
  • the request carries the broadcast stream information or the MBS information, and sends the newly created or updated broadcast bearer to the UE.
  • the MBS sends at least one of the broadcast stream information, the unicast stream information, and the UPF local broadcast backhaul indication information to the broadcast UPF, where the information is used to indicate that the data corresponding to the unicast stream information needs to be corresponding to the broadcast stream information.
  • the path is downlinked.
  • the MBS returns a V2V transport channel response (V2V transport channel response) to the SMF, where the V2X transport channel response is a response message of the second request message, where the V2X transport channel response includes broadcast UPF information (UPF (multicast) info).
  • the broadcast UPF information is used to identify the broadcast UPF, and the broadcast UPF is the UPF that performs the UPF local broadcast backhaul.
  • the broadcast UPF information may include at least one of the following information: the tunnel identifier of the broadcast UPF, and the broadcast UPF. Address, broadcast user plane address, and port number (for unicast UPF encapsulated packets).
  • the MBS establishes/updates the broadcast session in S902 to obtain the information of the above broadcast UPF.
  • the SMF sends an N4 session modification request to the unicast UPF (also referred to as a first UPF), where the N4 session modification request is a third request message, where the N4 session modification request includes broadcast UPF information and a single
  • the N4 session modification request is used to request an uplink data local backhaul (Local breakout) to broadcast downlink, that is, to request a UPF local broadcast backhaul.
  • the unicast stream information in S901 is the stream identifier
  • the unicast stream information in S905 is the stream identifier in S901.
  • the unicast stream information in S905 may be All the flow identifiers corresponding to the session identifier may be replaced by the core network (CN) tunnel identifier corresponding to the session identifier.
  • CN core network
  • the unicast UPF After receiving the uplink-downlink connection request, the unicast UPF forwards the data to the broadcast UPF if the uplink data corresponding to the UE is subsequently received.
  • the uplink-to-downlink connection request may further include: the UPF local broadcast backhaul indication information is used to indicate that the uplink data of the UE is not sent to the V2X server (ie, the V2X AS), and may be directly transferred to the corresponding downlink broadcast transmission path.
  • the UPF local broadcast backhaul indication information may indicate that the uplink data of the UE is sent to the V2X server, and another copy is sent to the corresponding downlink broadcast path transmission.
  • the unicast UPF sends data to the V2X server in addition to forwarding the data to the broadcast UPF.
  • the unicast UPF sends an N4 session modification response to the SMF, that is, a response message of the third request message, where the response information is used to confirm that the unicast UPF accepts the request of the third request message.
  • the SMF sends a PDU session modification response to the UE, and the PDU session modification response is a response message of the first request message, for confirming that the first request message is successfully processed.
  • the UE sends the uplink V2X message to the unicast UPF, and the unicast UPF encapsulates or forwards the data packet, and sends the uplink V2X message to the broadcast UPF.
  • the broadcast UPF sends the V2X message to other UEs by using a broadcast bearer.
  • the above-mentioned encapsulation refers to that the unicast UPF sends the uplink V2X message to the broadcast UPF by using the broadcast user plane address and the port number.
  • the forwarding refers to that the unicast UPF sends the uplink V2X message to the broadcast UPF, and the broadcast UPF performs the uplink V2X message.
  • Package refers to that the unicast UPF sends the uplink V2X message to the broadcast UPF, and the broadcast UPF performs the uplink V2X message.
  • the signaling interaction between the SMF and the MBS is an internal implementation and can be omitted. If the unicast UPF and the broadcast UPF are combined, S908 is implemented internally. The above steps can be performed at intervals.
  • FIG. 10 is a schematic flowchart of a method for transmitting data provided by the present application.
  • the UE is only an example of a terminal that communicates with the AMF or RAN, and the terminal that communicates with the AMF or RAN may also be an in-vehicle communication device.
  • Method 1000 includes:
  • the UE determines to change the transmission range according to the current V2X service characteristics (such as the type of the V2X message or the type of the V2X application).
  • the UE sends an MBMS Bearer Setup Request message to the SMF, the message including communication area information.
  • the communication area information is used to indicate the range of communication, and may also be referred to as broadcast area description information, which may be a service area identity (SAI), an E-UTRAN cell global identifier (ECGI), or Cell ID list, registration area (RA), tracing area (TA), local area data network service area, geographic area (such as latitude and longitude), etc. It can be the current location of the UE + radius distance.
  • SAI service area identity
  • ECGI E-UTRAN cell global identifier
  • TA tracing area
  • local area data network service area such as latitude and longitude
  • the SMF sends the message to the broadcast session network element (MBS as shown in Figure 10).
  • the broadcast bearer also referred to as a broadcast stream
  • the MBMS bearer setup request message may also carry an MBS session identifier (MBS session ID) or a broadcast bearer identifier (also referred to as a broadcast stream identifier).
  • MBS session ID MBS session identifier
  • broadcast bearer identifier also referred to as a broadcast stream identifier
  • the MBMS bearer setup request message may also carry MBS information (eg, the identifier, address, name, etc. of the MBS) for the SMF to contact the MBS.
  • the network side performs a broadcast bearer update or a broadcast bearer setup process. For example, if the request message of the S1001 carries the MBS session identifier or the broadcast bearer identifier or the MBS information, the SMF forwards the request to the MBS session identifier or the MBS corresponding to the broadcast bearer identifier or the MBS information. If the request message of S1001 does not include the MBS session identifier or the broadcast bearer identifier or the MBS information, the SMF selects an MBS according to the preset rule, and forwards the request message to the selected MBS.
  • the MBS After receiving the request, the MBS determines to create a new broadcast bearer or update the broadcast bearer according to the communication area information and the MBS session identifier or the broadcast bearer identifier or the MBS information, and sends the newly added or updated broadcast bearer to the UE.
  • the foregoing SMF may select one MBS according to a preset rule: select an MBS that is closer to the current location of the UE according to the location of the UE, or select an MBS with the lightest MBS load according to the MBS load, or select a location located in the communication area according to the communication area information and MBS near the center. If the MBMS bearer setup request message in S1001 does not include the communication area information, the SMF may select one MBS according to the first two preset rules.
  • the UE determines, according to the current V2X service feature (such as the type of the V2X message or the type of the V2X application), the uplink transmission broadcast downlink transmission mode, and the UE sends a PDU session modification request to the SMF, where the PDU session is sent.
  • the modification request is a first request message
  • the V2X transport channel request includes unicast stream information, and may further include at least one of broadcast stream information and UPF local broadcast backhaul indication information.
  • the above broadcast stream information is, for example, an MBS Session ID (MBS Session ID) and/or an MBS Bearer ID (MBS Bearer ID).
  • the unicast stream information may include at least one of an uplink session identifier, a flow identifier, and a unicast UPF tunnel identifier. If the unicast stream information includes a flow identifier, the unicast stream information is used to indicate the flow identifier. The corresponding stream needs to be switched to the downlink broadcast transmission. If the unicast stream information only includes the session ID, the unicast stream information is used to indicate that all the flows in the session corresponding to the session identifier need to be switched to the downlink broadcast transmission. If the unicast stream information includes the UPF tunnel identifier, the unicast stream information is used to indicate that the data corresponding to the UPF tunnel identifier needs to be converted to the downlink broadcast transmission.
  • the UPF local broadcast backhaul indication information is used to indicate that the uplink data of the UE of the SMF does not have to be sent to the V2X server (ie, AS), and can be directly transferred to the corresponding downlink broadcast.
  • the UPF local broadcast backhaul indication information may indicate that the uplink data of the UE is sent to the V2X server, and another copy is sent to the corresponding broadcast path downlink transmission.
  • the SMF sends a V2X transport channel request (ie, a second request message) to the MBS, where the V2X transport channel request is used to establish an association relationship between the unicast stream and the broadcast stream, and request to obtain UPF information of the broadcast session.
  • the V2X transport channel request may include unicast stream information, and may further include at least one of broadcast stream information, unicast stream information, and UPF local broadcast backhaul indication information.
  • the MBS establishes an association relationship between the unicast stream and the broadcast stream.
  • the MBS may map or bind the unicast stream information and the broadcast stream information.
  • the MBS returns a V2V transport channel response (V2V transport channel response) to the SMF, which is a response message of the second request message, the V2X transport channel response including broadcast UPF information (UPF (multicast) info).
  • the broadcast UPF information is used to identify the broadcast UPF, and the broadcast UPF is the UPF that performs the UPF local broadcast backhaul.
  • the broadcast UPF information may include at least one of the following information: the tunnel identifier of the broadcast UPF, and the broadcast UPF. Address, broadcast user plane address, and port number (for unicast UPF encapsulated packets).
  • the MBS obtains the information of the above broadcast UPF in the establishment/update process of the broadcast session in S1002.
  • the SMF sends a N4 session modification request to the unicast UPF (also referred to as a first UPF), where the N4 session modification request is a third request message, where the N4 session modification request includes broadcast UPF information and a single
  • the N4 session modification request is used to request an uplink data local backhaul (Local breakout) to broadcast downlink, that is, to request a UPF local broadcast backhaul.
  • the unicast stream information in S1003 is a stream identifier
  • the unicast stream information in S1006 is the stream identifier in S1003.
  • the unicast stream information in S1006 may be All the flow identifiers corresponding to the session identifier may be replaced by the core network (CN) tunnel identifier corresponding to the session identifier.
  • CN core network
  • the unicast UPF After receiving the uplink-downlink connection request, the unicast UPF forwards the data to the broadcast UPF if the uplink data corresponding to the UE is subsequently received.
  • the uplink-to-downlink connection request may further include: the UPF local broadcast backhaul indication information is used to indicate that the uplink data of the UE of the SMF does not have to be sent to the V2X server (ie, the AS), and may directly go to the corresponding downlink broadcast.
  • the UPF local broadcast backhaul indication information may indicate that the uplink data of the UE is sent to the V2X server, and another copy is sent to the corresponding broadcast path for downlink transmission.
  • the unicast UPF sends data to the V2X server in addition to forwarding the data to the broadcast UPF.
  • the unicast UPF sends an N4 session modification response to the SMF, that is, a response message of the third request message, where the N4 session modification response is used to confirm that the unicast UPF accepts the request of the third request message.
  • the SMF sends a PDU session modification response to the UE, where the PDU session modification response is a response message of the first request message, and is used to confirm that the first request message is successfully processed.
  • the UE sends the uplink V2X message to the unicast UPF, and the unicast UPF encapsulates or forwards the data packet, and sends the uplink V2X message to the broadcast UPF.
  • the broadcast UPF sends the V2X message to other UEs by using a broadcast bearer.
  • the above-mentioned encapsulation refers to that the unicast UPF sends the uplink V2X message to the broadcast UPF by using the broadcast user plane address and the port number.
  • the forwarding refers to that the unicast UPF sends the uplink V2X message to the broadcast UPF, and the broadcast UPF performs the uplink V2X message.
  • Package refers to that the unicast UPF sends the uplink V2X message to the broadcast UPF, and the broadcast UPF performs the uplink V2X message.
  • the signaling interaction between the SMF and the MBS is an internal implementation and can be omitted. If the unicast UPF and the broadcast UPF are combined, S1009 is an internal implementation. The above steps can be performed at intervals.
  • the following is a method for transmitting data provided by the present application in the case where a combination of SMF and MBS is established.
  • FIG. 11 is a schematic flowchart of a method for transmitting data provided by the present application.
  • the UE is only one example of a terminal that communicates with the AMF or RAN, and the terminal that communicates with the AMF or RAN may also be an in-vehicle communication device.
  • Method 1100 includes:
  • the UE determines to change the transmission range according to the current V2X service characteristics (such as the type of the V2X message or the type of the V2X application).
  • the UE sends an MBMS Bearer Setup Request message to the SMF, which may include communication area information.
  • the communication area information is used to indicate the range of communication, and may also be referred to as broadcast area description information, which may be a service area identity (SAI), an E-UTRAN cell global identifier (ECGI), or Cell ID list, registration area (RA), tracing area (TA), local area data network service area, geographic area (such as latitude and longitude), etc. It can be the current location of the UE + radius distance.
  • SAI service area identity
  • ECGI E-UTRAN cell global identifier
  • TA tracing area
  • local area data network service area such as latitude and longitude
  • geographic area such as latitude and longitude
  • the SMF sends the message to the broadcast session network element (MBS (MBMS SMF) as shown in Figure 7).
  • the MBMS bearer setup request message may also carry an MBS session identifier (MBS session ID) or a broadcast bearer identifier (which may also be referred to as a broadcast stream identifier) if there is a broadcast bearer available on the UE side (which may also be referred to as a broadcast stream).
  • Step S1101 is an optional step.
  • the network side performs a broadcast bearer update or a broadcast bearer setup process. For example, if the request message of the S1101 carries the MBS session identifier or the broadcast bearer identifier or the communication area information, the SMF determines to create a new broadcast bearer or update the broadcast bearer according to the communication area information and the MBS session identifier or the broadcast bearer identifier, and the newly created or updated The broadcast bearer is sent to the UE. This step is an optional step.
  • the UE determines, according to the current V2X service feature (such as the type of the V2X message or the type of the V2X application), the uplink transmission broadcast downlink transmission mode, and the UE sends a first request message to the SMF, where the first request message may be a V2X transmission.
  • the above broadcast stream information is, for example, an MBS Session ID (MBS Session ID) and/or an MBS Bearer ID (MBS Bearer ID).
  • the unicast stream information may include at least one of an uplink session identifier, a flow identifier, and a unicast UPF tunnel identifier.
  • the unicast stream information includes a flow identifier
  • the unicast stream information is used to indicate the flow identifier.
  • the corresponding stream needs to be switched to the downlink broadcast transmission;
  • the unicast stream information includes the session ID
  • the unicast stream information is used to indicate that all the flows in the session corresponding to the session identifier need to be switched to the downlink broadcast transmission;
  • the unicast stream information includes the UPF tunnel identifier
  • the unicast stream information is used to indicate that the data corresponding to the UPF tunnel identifier needs to be converted to the downlink broadcast transmission.
  • the UPF local broadcast backhaul indication information is used to indicate that the uplink data of the UE of the SMF does not have to be sent to the V2X server (ie, the AS), and may directly go to the corresponding downlink broadcast.
  • the UPF local broadcast backhaul indication information may indicate that the uplink data of the UE is sent to the V2X server, and another copy is sent to the corresponding broadcast path downlink transmission.
  • the message can also include communication area information. The description of the communication area information is the same as S1101. Step S1102 can also be performed after step S1103.
  • the SMF sends a third request message to the unicast UPF (also referred to as the first UPF), where the third request message may be a UL-DL link request, where the request includes performing a local broadcast backhaul.
  • the information of the UPF and the unicast stream information, the request is used to request the local unicast stream data local return (Local breakout) to broadcast downlink, that is, request UPF local broadcast backhaul to the unicast stream data.
  • the unicast stream information in S1103 is a stream identifier
  • the unicast stream information in S1104 is the stream identifier in S1103.
  • the unicast stream information in S1103 may be All the flow identifiers corresponding to the session identifier may be replaced by the core network (CN) tunnel identifier corresponding to the session identifier.
  • CN core network
  • the unicast UPF After receiving the uplink-to-downlink connection request, the unicast UPF forwards the unicast stream data to the broadcast UPF if the uplink unicast stream data corresponding to the UE is subsequently received.
  • the uplink downlink connection request may further include: the UPF local broadcast backhaul indication information is used to indicate that the uplink data of the UE is not sent to the V2X server (ie, the AS), and directly to the corresponding Downstream broadcast is fine.
  • the UPF local broadcast backhaul indication information may indicate that the uplink data of the UE is sent to the V2X server, and another copy is sent to the corresponding broadcast path for downlink transmission.
  • the unicast UPF forwards the unicast stream data to the broadcast UPF, and sends the data to the V2X server.
  • the manner in which the unicast UPF sends data to the broadcast UPF is the same as that of the previous embodiment.
  • the unicast UPF sends a response message of the third request message to the SMF, where the response message of the third request message may be an uplink-downlink connection response (UL-DL link response), that is, the uplink-to-downlink connection response is used for A request is made to acknowledge the unicast UPF accepting the third request message.
  • UL-DL link response uplink-downlink connection response
  • the SMF sends a response message of the first request message to the UE, where the response message of the first request message may be a V2X transport channel response or a PDU session modification response. A request message was successfully processed.
  • the UE sends the uplink V2X message to the unicast UPF, and the unicast UPF encapsulates or forwards the data packet, and sends the uplink V2X message to the broadcast UPF.
  • the broadcast UPF sends the V2X message to other UEs by using a broadcast bearer.
  • the above-mentioned encapsulation refers to that the unicast UPF sends the uplink V2X message to the broadcast UPF by using the broadcast user plane address and the port number.
  • the forwarding refers to that the unicast UPF sends the uplink V2X message to the broadcast UPF, and the broadcast UPF performs the uplink V2X message.
  • Package refers to that the unicast UPF sends the uplink V2X message to the broadcast UPF, and the broadcast UPF performs the uplink V2X message.
  • S1107 is an internal implementation. The above steps can be performed at intervals.
  • each network element includes a corresponding hardware structure and/or software module for executing each function.
  • the present application can be implemented in a combination of hardware or hardware and computer software in combination with the elements and algorithm steps of the various examples described in the embodiments disclosed herein. Whether a function is implemented in hardware or computer software to drive hardware depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present application.
  • the present application may divide functional units for each network element according to the above method example.
  • each functional unit may be divided according to each function, or two or more functions may be integrated into one processing unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit. It should be noted that the division of the unit in the present application is schematic, and is only a logical function division, and the actual implementation may have another division manner.
  • Fig. 12 shows a possible structural diagram of the terminal involved in the above embodiment.
  • the terminal 1200 includes a processing unit 1202 and a communication unit 1203.
  • the processing unit 1202 is configured to control and manage the actions of the terminal 1200.
  • the processing unit 1202 is configured to support the terminal 1200 to perform the various steps of FIG. 2 and/or other processes for the techniques described herein.
  • the communication unit 1203 is configured to support communication between the terminal 1200 and other network elements, such as communication with the RAN.
  • the terminal 1200 may further include a storage unit 1201 for storing program codes and data of the terminal 1200.
  • processing unit 1202 is configured to control the communication unit 1203 to perform the following steps:
  • the processing unit 1202 may be a processor or a controller, for example, may be a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), and an application-specific integrated circuit (application-specific). Integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic device, transistor logic device, hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure.
  • the processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like.
  • the communication unit 1203 may be a transceiver, a transceiver circuit, or the like.
  • the storage unit 1201 may be a memory.
  • the terminal involved in the present application may be the terminal shown in FIG.
  • the terminal 1300 includes a processor 1302, a transceiver 1303, and a memory 1301.
  • the transceiver 1303, the processor 1302, and the memory 1301 can communicate with each other through an internal connection path to transfer control and/or data signals.
  • the terminal 1200 and the terminal 1300 provided by the present application can reduce the transmission delay of unicast stream data that needs to be broadcast in a small range.
  • FIG. 14 shows a possible structural diagram of the SMF involved in the above embodiment.
  • the SMF 1400 includes a processing unit 1402 and a communication unit 1403.
  • the processing unit 1402 is configured to control the management of the actions of the SMF 1400.
  • the processing unit 1402 is configured to support the SMF 1400 to perform the various steps of FIG. 3 and/or other processes for the techniques described herein through the communication unit 1403.
  • the communication unit 1403 is configured to support communication between the SMF 1400 and other network entities, such as communication with the first UPF.
  • the SMF 1400 may also include a storage unit 1401 for storing program codes and data of the SMF 1400.
  • processing unit 1402 is configured to control the communication unit 1403 to perform the following steps:
  • the first request message is used to request to perform UPF local broadcast backhaul on the unicast stream data;
  • the processing unit 1402 may be a processor or a controller, such as a CPU, a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure.
  • the processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like.
  • the communication unit 1403 may be a communication interface, a transceiver circuit, or the like.
  • the storage unit 1401 may be a memory.
  • the SMF involved in the present application may be the SMF shown in FIG.
  • the SMF 1500 includes a processor 1502, a communication interface 1503, and a memory 1501.
  • the communication interface 1503, the processor 1502, and the memory 1501 can communicate with each other through an internal connection path to transfer control and/or data signals.
  • the SMF 1400 and the SMF 1500 for data transmission provided by the present application can reduce the transmission delay of unicast stream data that needs to be broadcast in a small range.
  • FIG. 16 shows a possible structural diagram of the first UPF involved in the above embodiment.
  • the first UPF 1600 includes a processing unit 1602 and a communication unit 1603.
  • the processing unit 1602 is configured to control manage the actions of the first UPF 1600, for example, the processing unit 1602 is configured to support the first UPF 1600 to perform the various steps of FIG. 4 and/or other processes for the techniques described herein through the communication unit 1603.
  • the communication unit 1603 is configured to support communication between the first UPF 1600 and other network entities, such as communication with the SMF.
  • the first UPF 1600 may further include a storage unit 1601 for storing program codes and data of the first UPF 1600.
  • processing unit 1602 is configured to control the communication unit 1603 to perform the following steps:
  • the third request message is used to request to perform UPF local broadcast backhaul on the unicast stream data;
  • a response message to the third request message is sent to the SMF.
  • the processing unit 1602 can be a processor or a controller, such as a CPU, a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure.
  • the processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like.
  • the communication unit 1603 may be a communication interface, a transceiver circuit, or the like.
  • the storage unit 1601 may be a memory.
  • the first UPF involved in the present application may be the first UPF shown in FIG.
  • the first UPF 1700 includes a processor 1702, a communication interface 1703, and a memory 1701.
  • the communication interface 1703, the processor 1702, and the memory 1701 can communicate with each other through an internal connection path to transfer control and/or data signals.
  • the first UPF 1600 and the first UPF 1700 for data transmission provided by the present application can reduce the transmission delay of unicast stream data that needs to be broadcast in a small range.
  • FIG. 18 shows a possible structural diagram of the broadcast session management network element involved in the above embodiment.
  • the broadcast session management network element 1800 includes a processing unit 1802 and a communication unit 1803.
  • the processing unit 1802 is configured to control and manage the action of the broadcast session management network element 1800.
  • the processing unit 1802 is configured to support the broadcast session management network element 1800 to perform the steps of FIG. 5 through the communication unit 1803 and/or for the description herein. Other processes of technology.
  • the communication unit 1803 is configured to support communication between the broadcast session management network element 1800 and other network entities, such as communication with the SMF.
  • the broadcast session management network element 1800 may further include a storage unit 1801 for storing program codes and data of the broadcast session management network element 1800.
  • processing unit 1802 is configured to control the communication unit 1803 to perform the following steps:
  • the response message of the second request message includes information identifying the UPF performing the UPF local broadcast backhaul.
  • the processing unit 1802 can be a processor or a controller, such as a CPU, a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure.
  • the processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like.
  • the communication unit 1803 may be a communication interface, a transceiver circuit, or the like.
  • the storage unit 1801 may be a memory.
  • the broadcast session management network element involved in the present application may be the broadcast session management network element shown in FIG.
  • the broadcast session management network element 1900 includes a processor 1902, a communication interface 1903, and a memory 1901.
  • the communication interface 1903, the processor 1902, and the memory 1901 can communicate with each other through an internal connection path to transfer control and/or data signals.
  • the broadcast session management network element 1800 and the broadcast session management network element 1900 for data transmission provided by the present application can reduce the transmission delay of unicast stream data that needs to be broadcast in a small range.
  • FIG. 20 shows a possible structural diagram of the second UPF involved in the above embodiment.
  • the second UPF 2000 includes a processing unit 2002 and a communication unit 2003.
  • the processing unit 2002 is for controlling management of the actions of the second UPF 2000, for example, the processing unit 2002 is configured to support the second UPF 2000 to perform the various steps of FIG. 6 and/or other processes for the techniques described herein through the communication unit 2003.
  • the communication unit 2003 is for supporting communication between the second UPF 2000 and other network entities, such as communication with the first UPF.
  • the second UPF 2000 may further include a storage unit 2001 for storing program codes and data of the second UPF 2000.
  • processing unit 2002 is configured to control the communication unit 2003 to perform the following steps:
  • Receiving unicast stream data from the first UPF, and the second UPF is a UPF performing UPF local broadcast backhaul;
  • the data corresponding to the corresponding session broadcast unicast stream is returned by the UPF local broadcast.
  • the processing unit 2002 can be a processor or a controller, such as a CPU, a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure.
  • the processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like.
  • the communication unit 2003 may be a communication interface, a transceiver circuit, or the like.
  • the storage unit 2001 can be a memory.
  • the second UPF involved in the present application may be the second UPF shown in FIG.
  • the second UPF 2100 includes a processor 2102, a communication interface 2103, and a memory 2101.
  • the communication interface 2103, the processor 2102, and the memory 2101 can communicate with each other through an internal connection path to transfer control and/or data signals.
  • the second UPF 2000 and the second UPF 2100 for data transmission provided by the present application can reduce the transmission delay of unicast stream data that needs to be broadcast in a small range.
  • the size of the sequence number of each process does not mean the order of execution sequence, and the order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the present application.
  • the steps of a method or algorithm described in connection with the present disclosure may be implemented in a hardware or may be implemented by a processor executing software instructions.
  • the software instructions may be composed of corresponding software modules, which may be stored in a random access memory (RAM), a flash memory, a read only memory (ROM), an erasable programmable read only memory ( Erasable programmable ROM (EPROM), electrically erasable programmable read only memory (EEPROM), registers, hard disk, removable hard disk, compact disk read only (CD-ROM) or any other form of storage medium known in the art.
  • An exemplary storage medium is coupled to the processor to enable the processor to read information from, and write information to, the storage medium.
  • the storage medium can also be an integral part of the processor.
  • the processor and the storage medium can be located in an ASIC. Additionally, the ASIC can be located in a terminal device or a core network element. Of course, the processor and the storage medium may also exist as discrete components in the terminal device or the core network element.
  • the computer program product includes one or more computer instructions.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • the computer instructions can be stored in or transmitted by a computer readable storage medium.
  • the computer instructions may be from a website site, computer, server or data center via a wired (eg, coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (eg, infrared, wireless, microwave, etc.) Another website site, computer, server, or data center for transmission.
  • the computer readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that includes one or more available media.
  • the usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital versatile disc (DVD), or a semiconductor medium (eg, a solid state disk (SSD)). Wait.

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Abstract

本申请提供了一种传输数据的方法和装置，该方法包括：终端向SMF发送第一请求消息，第一请求消息用于请求对单播流数据执行UPF本地广播回传；该终端接收第一请求消息的响应消息。第一请求消息用于请求对单播流数据执行UPF本地广播回传，使得管理广播会话的UPF不再将接收到的单播流数据转发至AS，而是直接将接收到的单播流数据在本地(即，管理广播会话的UPF)执行广播回传，减少了单播流数据的传输路径的长度，从而减小了需要在小范围内广播的单播流数据的传输时延。

Description

传输数据的方法和装置
本申请要求于2018年04月09日提交中国专利局、申请号为201810313053.7、申请名称为“传输数据的方法和装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信领域，尤其涉及一种传输数据的方法和装置。
背景技术
在无线通信系统中，例如在第五代(5th-generation，5G)移动通信系统中，终端的数据如车辆与万物(vehicle to everything，V2X)消息可以通过上行链路发送到网络侧，然后网络侧通过下行链路发送给其他终端。现有技术中，应用服务器是数据处理和转发的锚点，即终端发送数据的上行链路必须到达应用服务器(application server，AS)，应用服务器对数据进行处理(如对数据进行解析)，然后由应用服务器进行下行数据的发送。但是，有些数据只需要在小范围(例如半径300米的范围)内传输即可，并且有些数据无需服务器进行处理，服务器能做的仅仅是转发，徒增时延。综上，如何实现在小范围内降低数据传输时延是当前需要解决的问题。
发明内容
本申请提供了一种传输数据的方法和装置，通过向管理广播会话的用户面功能(user plane function，UPF)发送请求消息，该请求消息请求管理广播会话的UPF对部分上行信息执行本地广播回传，不再向AS发送这部分上行信息，可以减小在小范围内广播的上行信息的传输时延。
第一方面，提供了一种传输数据的方法，包括：终端向会话管理功能(session management function，SMF)发送第一请求消息，第一请求消息用于请求对单播流数据执行UPF本地广播回传；该终端接收第一请求消息的响应消息。
单播流数据可以是通过单播流传输的数据(data over unicast flow)，也可以是通过服务质量(quality of service，QoS)流传输的数据。第一请求消息用于请求对单播流数据执行UPF本地广播回传，使得管理广播会话的UPF不再将接收到的单播流数据转发至AS，而是直接将接收到的单播流数据在本地(即，管理广播会话的UPF)执行广播回传，减少了单播流数据的传输路径的长度，从而减小了需要在小范围内广播的单播流数据的传输时延。
可选地，所述响应消息用于指示第一请求消息已被接受。
第一请求消息的响应消息例如可以是一个肯定应答(acknowledgement，ACK)或者否定应答(negative acknowledgement，NACK)，当第一请求消息的响应消息为ACK时， 第一请求消息的响应消息用于指示第一请求消息已被接受，或者，第一请求消息的响应消息用于指示第一请求消息的请求内容已被接受，终端接收到ACK时，即可发送单播流数据，从而避免了因核心网未准备好进行UPF广播回传导致的单播流数据广播回传失败。
可选地，第一请求消息包括：单播流信息，单播流信息用于标识单播流数据的上行传输路径。
核心网可以根据单播流信息识别出单播流数据的上行传输路径，从而可以建立单播流数据的上行传输路径与广播回传路径的关联关系。
可选地，第一请求消息还包括广播流信息、通信区域信息和本地广播回传指示信息中的至少一个；其中，广播流信息用于指示UPF本地广播回传的传输路径，通信区域信息用于指示UPF本地广播回传的通信区域，本地广播回传指示信息用于指示对单播流数据执行UPF本地广播回传。
当第一请求消息可以包括广播流信息和通信区域信息时，核心网可以根据广播流信息和通信区域信息确定UPF本地广播回传的传输路径和通信区域，无需再根据其它方法计算UPF本地广播回传的传输路径和通信区域，减小了核心网的负载。此外，本地广播回传指示信息通过明示方式指示对单播流数据执行UPF本地广播回传，进一步提高了本地广播回传的可靠性。
可选地，第一请求消息还包括广播会话管理网元的标识，所述广播会话管理网元为管理UPF本地广播回传所使用的广播会话的网元。
广播会话管理网元可以是具有广播会话管理功能的SMF，也可以是独立的网元。
第二方面，提供了一种传输数据的方法，包括：SMF接收来自终端的第一请求消息，该第一请求消息用于请求对单播流数据执行UPF本地广播回传；SMF向终端发送第一请求消息的响应消息。
上述实施例提供的方法，终端通过向SMF发送第一请求消息，以请求对单播流数据执行UPF本地广播回传，使得收到终端发送的单播流数据的UPF(该UPF为单播会话对应的UPF)不再将接收到的单播流数据转发至AS，而是将接收到的单播流数据转发到广播会话对应的UPF在本地(即，广播会话对应的UPF，也是UPF广播回传所使用的广播传输路径对应的UPF)执行广播回传，减少了单播流数据的传输路径的长度，从而减小了需要在小传输范围(例如，一个PLMN所对应的传输范围，或者一个UPF对应的范围)内广播的单播流数据的传输时延。
可选地，所述响应消息用于指示第一请求消息已被接受。
第一请求消息的响应消息例如可以是一个ACK或者NACK，当第一请求消息的响应消息为ACK时，第一请求消息的响应消息用于指示第一请求消息已被接受，或者，第一请求消息的响应消息用于指示第一请求消息的请求内容已被接受，终端接收到ACK时，即可发送单播流数据，从而避免了因核心网未准备好进行UPF广播回传导致的单播流数据广播回传失败。
可选地，第一请求消息包括：单播流信息，单播流信息用于标识单播流数据的上行传输路径。
核心网可以根据单播流信息识别出单播流数据的上行传输路径，从而可以建立单播流数据的上行传输路径与广播回传路径的关联关系。
可选地，第一请求消息还包括广播流信息、通信区域信息和本地广播回传指示信息中的至少一个；其中，广播流信息用于指示UPF本地广播回传的传输路径，通信区域信息用于指示UPF本地广播回传的通信区域，本地广播回传指示信息用于指示对单播流数据执行UPF本地广播回传。
当第一请求消息可以包括广播流信息和通信区域信息时，核心网可以根据广播流信息和通信区域信息确定UPF本地广播回传的传输路径和通信区域，无需再根据其它方法计算UPF本地广播回传的传输路径和通信区域，减小了核心网的负载。此外，本地广播回传指示信息通过明示方式指示对单播流数据执行UPF本地广播回传，进一步提高了UPF本地广播回传的可靠性。
可选地，第一请求消息还包括广播会话管理网元的标识，该广播会话管理网元为管理UPF本地广播回传所使用的广播会话的网元。
广播会话管理网元可以是具有广播会话管理功能的SMF，也可以是独立的网元。
可选地，所述方法还包括：SMF确定广播会话管理网元，广播会话管理网元为管理UPF广播回传所使用的广播会话的网元；SMF根据第一请求消息向广播会话管理网元发送第二请求消息，第二请求消息用于获取执行UPF本地广播回传的UPF的信息；SMF接收第二请求消息的响应消息，第二请求消息的响应消息包括标识执行UPF本地广播回传的UPF的信息。
SMF接收到第一请求消息后向广播会话管理网元发送第二请求消息，以获取执行UPF本地广播回传的UPF的信息，该UPF的信息例如是UPF的标识，从而可以向该UPF请求执行UPF本地广播回传。
可选地，SMF确定广播会话管理网元，包括：当第一请求消息包括所述广播会话管理网元的标识时，SMF根据所述广播会话管理网元的标识确定广播会话管理网元；或者，当第一请求消息不包括广播会话管理网元的标识时，SMF根据预设规则确定广播会话管理网元。
上述预设规则例如是选择一个距离终端较近的广播会话管理网元，或者，选择一个负载较小的广播会话管理网元，或者，选择一个位于终端指示的通信区域的中心位置的广播会话管理网元，因此，本实施例提供的技术方案可以灵活选择广播会话管理网元。
可选地，第二请求消息包括单播流信息。
广播会话管理网元可以根据单播流信息识别出单播流数据的上行传输路径，从而可以建立单播流数据的上行传输路径与广播回传路径的关联关系。
可选地，第二请求消息还包括广播流信息、通信区域信息和本地广播回传指示信息中的至少一个；其中，广播流信息用于指示UPF本地广播回传的传输路径，通信区域信息用于指示UPF本地广播回传的通信区域，本地广播回传指示信息用于指示对单播流数据执行UPF本地广播回传。
当第二请求消息可以包括广播流信息和通信区域信息时，广播会话管理网元可以根据广播流信息和通信区域信息确定UPF本地广播回传的传输路径和通信区域，无需再根据其它方法计算UPF本地广播回传的传输路径和通信区域，减小了广播会话管理网元的负载。此外，本地广播回传指示信息通过明示方式指示对单播流数据执行UPF本地广播回传，进一步提高了UPF本地广播回传的可靠性。
可选地，所述方法还包括：SMF向第一UPF发送第三请求消息，第三请求消息用于请求对单播流数据执行UPF本地广播回传；SMF接收来自第一UPF的第三请求消息的响应消息。
确定了广播会话管理网元之后，SMF即可根据向第一UPF发送第三请求消息，第一UPF为管理单播会话的UPF，以便于第一UPF向第二UPF请求对单播流数据执行UPF本地广播回传，第二UPF为执行UPF本地广播回传的UPF，从而可以实现UPF本地广播回传。
可选地，第三请求消息包括执行UPF本地广播回传的UPF的信息和单播流信息。
本实施例中，第三请求消息所包括的信息用于第一UPF在接收到单播流数据后对该单播流数据进行封装后发送给第二UPF，或者，第三请求消息所包括的信息用于第一UPF在接收到单播流数据后将该单播流数据直接转发给第二UPF。
第三方面，提供了一种传输数据的方法，包括：第一UPF接收来自SMF的第三请求消息，第三请求消息用于请求对单播流数据执行UPF本地广播回传；第一UPF向SMF发送第三请求消息的响应消息。
第一UPF为管理单播会话的UPF，第一UPF接收到第三请求消息后即可向第二UPF请求对单播流数据执行UPF本地广播回传，第二UPF为执行UPF本地广播回传的UPF，从而可以实现UPF本地广播回传。
可选地，第三请求消息包括执行UPF本地广播回传的UPF的信息和单播流信息，单播流信息用于标识单播流数据的上行传输路径。
本实施例中，第三请求消息所包括的信息用于第一UPF在接收到单播流数据后对该单播流数据进行封装后发送给第二UPF，或者，第三请求消息所包括的信息用于第一UPF在接收到单播流数据后将该单播流数据直接转发给第二UPF。
可选地，所述方法还包括：第一UPF接收单播流数据；第一UPF根据执行UPF本地广播回传的UPF的信息向第二UPF发送单播流数据，第二UPF为执行UPF本地广播回传的UPF。
第四方面，提供了一种传输数据的方法，包括：广播会话管理网元接收来自SMF的第二请求消息，第二请求消息用于获取执行UPF本地广播回传的UPF的信息；广播会话管理网元向SMF发送第二请求消息的响应消息，第二请求消息的响应消息包括标识执行UPF本地广播回传的UPF的信息。
广播会话管理网元可以是管理UPF本地广播回传的广播SMF，广播会话管理网元接收到来自SMF的第二请求消息后，根据第二请求消息确定执行UPF本地广播回传的UPF的信息，该UPF的信息例如是UPF的标识，并向SMF发送该UPF的信息，以便于终端向该UPF请求执行UPF本地广播回传。
可选地，第二请求消息包括单播流信息，单播流信息用于标识单播流数据的上行传输路径。
广播会话管理网元可以根据单播流信息识别出单播流数据的上行传输路径，从而可以建立单播流数据的上行传输路径与广播回传路径的关联关系。
可选地，第二请求消息还包括广播流信息、通信区域信息和本地广播回传指示信息中的至少一个，其中，广播流信息用于指示UPF本地广播回传的传输路径，通信区域信息 用于指示UPF本地广播回传的通信区域，本地广播回传指示信息用于指示对单播流数据执行UPF本地广播回传。
当第二请求消息可以包括广播流信息和通信区域信息时，广播会话管理网元可以根据广播流信息和通信区域信息确定UPF本地广播回传的传输路径和通信区域，无需再根据其它方法计算UPF本地广播回传的传输路径和通信区域，减小了广播会话管理网元的负载。此外，本地广播回传指示信息通过明示方式指示对单播流数据执行UPF本地广播回传，进一步提高了UPF本地广播回传的可靠性。
可选地，所述方法还包括：广播会话管理网元根据第二请求消息执行广播会话的建立或更新操作，该广播会话为UPF本地广播回传对应的会话。
可选地，广播会话管理网元根据第二请求消息执行广播会话的建立或更新操作，包括:
广播会话管理网元根据广播流信息更新广播流信息标识的广播会话；或者，
广播会话管理网元根据通信区域信息更新广播流信息标识的广播会话，广播会话的通信区域为通信区域信息指示的区域；或者，
广播会话管理网元根据本地广播回传指示信息更新广播流信息标识的广播会话。
本实施例可以灵活实现更新或新建广播流标识的广播会话。
第五方面，提供了一种传输数据的方法，包括：第二UPF接收来自第一UPF的单播流数据，第二UPF为执行UPF本地广播回传的UPF；第二UPF通过UPF本地广播回传对应的广播传输路径广播单播流数据。
可选地，所述方法还包括：第二UPF接收广播会话建立信息或广播会话更新信息，所述广播会话建立信息用于请求建立UPF本地广播回传对应的会话，所述广播会话更新信息用于请求更新UPF本地广播回传对应的会话；根据所述广播会话建立信息或所述广播会话更新信息建立或更新所述UPF本地广播回传对应的会话。
第六方面，提供了一种传输数据的装置，该装置可以实现上述第一方面所涉及方法中终端所执行的功能，所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能对应的单元或模块。
在一种可能的设计中，该装置包括处理器和收发器，该处理器被配置为支持该装置实现上述方法中相应的功能。该收发器用于支持该装置与其它网元之间的通信。该装置还可以包括存储器，该存储器用于与处理器耦合，其保存该装置必要的程序指令和数据。
第七方面，提供了一种传输数据的装置，该装置可以实现上述第二方面所涉及方法中SMF所执行的功能，所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能对应的单元或模块。
在一种可能的设计中，该装置包括处理器和通信接口，该处理器被配置为支持该装置实现上述方法中相应的功能。该通信接口用于支持该装置与其它网元之间的通信。该装置还可以包括存储器，该存储器用于与处理器耦合，其保存该装置必要的程序指令和数据。
第八方面，提供了一种传输数据的装置，该装置可以实现上述第三方面所涉及方法中第一UPF所执行的功能，所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能对应的单元或模块。
在一种可能的设计中，该装置包括处理器和通信接口，该处理器被配置为支持该装置实现上述方法中相应的功能。该通信接口用于支持该装置与其它网元之间的通信。该装置 还可以包括存储器，该存储器用于与处理器耦合，其保存该装置必要的程序指令和数据。
第九方面，提供了一种传输数据的装置，该装置可以实现上述第四方面所涉及方法中广播会话管理网元所执行的功能，所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能对应的单元或模块。
在一种可能的设计中，该装置包括处理器和通信接口，该处理器被配置为支持该装置实现上述方法中相应的功能。该通信接口用于支持该装置与其它网元之间的通信。该装置还可以包括存储器，该存储器用于与处理器耦合，其保存该装置必要的程序指令和数据。
第十方面，提供了一种传输数据的装置，该装置可以实现上述第五方面所涉及方法中第二UPF所执行的功能，所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能对应的单元或模块。
在一种可能的设计中，该装置包括处理器和通信接口，该处理器被配置为支持该装置实现上述方法中相应的功能。该通信接口用于支持该装置与其它网元之间的通信。该装置还可以包括存储器，该存储器用于与处理器耦合，其保存该装置必要的程序指令和数据。
第十一方面，提供了一种网络系统，所述网络系统包括上述第六方面至第十方面所述的传输数据的装置。
第十二方面，提供了一种计算机程序产品，所述计算机程序产品包括：计算机程序代码，当所述计算机程序代码被终端的通信单元、处理单元或收发器、处理器运行时，使得终端执行上述第一方面的各个实现方式中的方法。
第十三方面，提供了一种计算机程序产品，所述计算机程序产品包括：计算机程序代码，当所述计算机程序代码被SMF的通信单元、处理单元或通信接口、处理器运行时，使得SMF执行上述第二方面的各个实现方式中的方法。
第十四方面，提供了一种计算机程序产品，所述计算机程序产品包括：计算机程序代码，当所述计算机程序代码被第一UPF的通信单元、处理单元或通信接口、处理器运行时，使得第一UPF执行上述第三方面的各个实现方式中的方法。
第十五方面，提供了一种计算机程序产品，所述计算机程序产品包括：计算机程序代码，当所述计算机程序代码被广播会话管理网元的通信单元、处理单元或通信接口、处理器运行时，使得广播会话管理网元执行上述第四方面的各个实现方式中的方法。
第十六方面，提供了一种计算机程序产品，所述计算机程序产品包括：计算机程序代码，当所述计算机程序代码被第二UPF的通信单元、处理单元或通信接口、处理器运行时，使得第二UPF执行上述第五方面的各个实现方式中的方法。
第十七方面，提供了一种计算机存储介质，用于储存为上述终端所用的计算机软件指令，其包含用于执行第一方面的方法所设计的程序。
第十八方面，提供了一种计算机存储介质，用于储存为上述SMF所用的计算机软件指令，其包含用于执行第二方面的方法所设计的程序。
第十九方面，提供了一种计算机存储介质，用于储存为上述第一UPF所用的计算机软件指令，其包含用于执行第三方面的方法所设计的程序。
第二十方面，提供了一种计算机存储介质，用于储存为上述广播会话管理网元所用的计算机软件指令，其包含用于执行第四方面的方法所设计的程序。
第二十一方面，提供了一种计算机存储介质，用于储存为上述第二UPF所用的计算 机软件指令，其包含用于执行第五方面的方法所设计的程序。
附图说明
图1是一种适用于本申请的网络架构的示意图；
图2是本申请提供的一种传输数据的方法的示意图；
图3是本申请提供的另一种传输数据的方法的示意图；
图4是本申请提供的再一种传输数据的方法的示意图；
图5是本申请提供的再一种传输数据的方法的示意图；
图6是本申请提供的再一种传输数据的方法的示意图；
图7是本申请提供的再一种传输数据的方法的示意图；
图8是本申请提供的再一种传输数据的方法的示意图；
图9是本申请提供的再一种传输数据的方法的示意图；
图10是本申请提供的再一种传输数据的方法的示意图；
图11是本申请提供的再一种传输数据的方法的示意图；
图12是本申请提供的一种可能的终端的结构示意图；
图13是本申请提供的另一种可能的终端的结构示意图；
图14是本申请提供的一种可能的SMF的结构示意图；
图15是本申请提供的另一种可能的SMF的结构示意图；
图16是本申请提供的一种可能的第一UPF的结构示意图；
图17是本申请提供的另一种可能的第一UPF的结构示意图；
图18是本申请提供的一种可能的广播会话管理网元的结构示意图；
图19是本申请提供的另一种可能的广播会话管理网元的结构示意图；
图20是本申请提供的一种可能的第二UPF的结构示意图；
图21是本申请提供的另一种可能的第二UPF的结构示意图。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
本申请的技术方案可以应用于各种通信系统，例如：全球移动通讯(global system of mobile communication，GSM)系统、码分多址(code division multiple access，CDMA)系统、宽带码分多址(wideband code division multiple access，WCDMA)系统、通用分组无线业务(general packet radio service，GPRS)、长期演进(long term evolution，LTE)系统、LTE频分双工(frequency division duplex，FDD)系统、LTE时分双工(time division duplex，TDD)、通用移动通信系统(universal mobile telecommunication system，UMTS)、全球互联微波接入(worldwide interoperability for microwave access，WiMAX)通信系统、5G系统等。
本申请中的终端可以指用户设备、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、无线通信设备、用户代理或用户装置。终端还可以是蜂窝电话、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、可穿戴设备，5G网络中的终端或者未来演进的公用陆地移动通信网络(public land mobile network，PLMN)中的终端等，本申请对此并不限定。
图1是应用于本申请的网络架构。如图1所示，该网络架构是从服务化接口的角度描述的网络架构，下面对该网络架构中涉及的各个网元分别进行简要说明。
1、(无线)接入网络(radio access network，(R)AN)：用于为特定区域的授权用户提供入网功能，并能够根据用户的级别，业务的需求等使用不同质量的传输隧道。(R)AN网元能够管理无线资源，为终端提供接入服务，进而完成控制信号和用户数据在终端和核心网之间的转发，(R)AN网元也可以理解为传统网络中的基站。
2、用户平面功能(user plane function，UPF)：用于分组路由和转发以及用户面数据的QoS处理等。
3、数据网络(data network，DN)网元：用于提供传输数据的网络，例如，因特网(Internet)等。
4、认证服务功能(authentication server function，AUSF)：主要用于用户鉴权等。
5、接入管理功能(access and mobility management function，AMF)：主要用于移动性管理和接入管理等，可以用于实现移动性管理实体(mobility management entity，MME)功能中除会话管理之外的其它功能，例如合法监听以及接入授权\鉴权等功能。
6、会话管理功能(session management function，SMF)：主要用于会话管理、终端的网络互连协议(internet protocol，IP)地址分配和管理、选择可管理用户平面功能、策略控制和收费功能接口的终结点以及下行数据通知等。
7、网络开放功能(network exposure function，NEF)：用于安全地向外部开放由3GPP网络功能提供的业务和能力等。
8、网络存储功能(network repository function，NRF)：用于保存网络功能实体以及其提供服务的描述信息，以及支持服务发现，网元实体发现等。
9、策略控制功能(policy control function，PCF)：用于指导网络行为的统一策略框架，为控制平面功能网元(例如AMF，SMF等)提供策略规则信息等。
10、统一数据管理(unified data management，UDM)：用于处理用户标识，接入鉴权，注册以及移动性管理等。
11、应用功能(application function，AF)：用于进行应用影响的数据路由，接入网络开放功能网元，与策略框架交互进行策略控制等。
13、用户设备(user equipment，UE)：可以包括各种具有无线通信功能的手持设备、车载设备、可穿戴设备、计算设备或连接到无线调制解调器的其它处理设备，以及各种形式的终端，移动台(mobile station，MS)，终端(terminal)，软终端等等，例如车载通信设备、传感器等。
在该网络架构中，N2接口为(R)AN120和AMF160的参考点，用于非接入层(non-access stratum，NAS)消息的发送等；N3接口为(R)AN120和UPF130之间的参考点，用于传输用户面的数据等；N4接口为SMF170和UPF130之间的参考点，用于传输例如N3连接的隧道标识信息，数据缓存指示信息，以及下行数据通知消息等信息；N6接口为UPF130和DN140之间的参考点，用于传输用户面的数据等。
应理解，上述应用于本申请实施例的网络架构仅是举例说明的从服务化架构的角度描述的网络架构，适用本申请实施例的网络架构并不局限于此，任何能够实现上述各个网元的功能的网络架构都适用于本申请实施例。
例如，在某些网络架构中，AMF160、SMF170、PCF1110以及UDM1120等网络功能实体都称为网络功能(network function，NF)；或者，在另一些网络架构中，AMF160，SMF170，PCF1110，UDM1120等网元的集合都可以称为控制面功能(control plane function，CPF)。
为了方便描述，以上述网络架构为例，对本申请的实施例进行详细说明。
下面，结合图2至图6对根据本申请实施例的传输数据的方法进行说明。
图2示出了本申请提供的一种传输数据的方法的示意图，该方法200包括：
S210，终端向SMF发送第一请求消息，第一请求消息用于请求对单播流数据执行UPF本地广播回传。
示例性地，终端可以通过RAN及AMF向SMF发送第一请求消息，以请求对单播流数据执行UPF本地广播回传。
其中，该第一请求消息可以是专有消息，例如，V2X传输信道请求(V2X transport channel request)。
此外，第一请求消息也可以是复用的其它消息，例如，分组数据单元(packet data unit，PDU)会话修改请求(PDU session modification request)。终端可以通过显式或隐式的方式复用其它消息，例如，终端可以在PDU会话修改请求中加入指示信息或者特殊格式的信息。相应地，当核心网网元接收到包含指示信息或者特殊格式的信息的PDU会话修改请求时，可确定终端请求对单播流数据执行UPF本地广播回传。
其中，单播流数据可以是通过单播流传输的数据(data over unicast flow)，也可以是通过QoS流传输的数据，不予限制。
在本申请中，若无特别说明，则“承载(bear)”与“流(flow)”可以替换使用。
“UPF本地广播回传”，指的是数据传输的上行的单播流数据到达UPF后，不再向通信网络以外传输，而是以UPF为上行和下行数据转发的锚点，通过UPF所对应下行广播传输路径发送给其他UE。其中上行接收单播流数据的UPF和以广播方式发送该流数据的UPF可以不是同一个UPF。
S220，该终端接收第一请求消息的响应消息。
上述实施例提供的方法，终端通过向SMF发送第一请求消息，以请求对单播流数据执行UPF本地广播回传，使得收到终端发送的单播流数据的UPF(该UPF为单播会话对应的UPF)不再将接收到的单播流数据转发至AS，而是将接收到的单播流数据转发到广播会话对应的UPF在本地(即，广播会话对应的UPF，也是UPF广播回传所使用的广播传输路径对应的UPF)执行广播回传，减少了单播流数据的传输路径的长度，从而减小了需要在小传输范围(例如，一个PLMN所对应的传输范围，或者一个UPF对应的范围)内广播的单播流数据的传输时延。
可选地，所述响应消息用于指示第一请求消息已被接受。
其中，第一请求消息的响应消息可以是一个ACK或者NACK。示例性地，当第一请求消息的响应消息为ACK时，第一请求消息的响应消息用于指示第一请求消息已被接受， 或者，第一请求消息的响应消息用于指示第一请求消息的请求内容已被接受，终端接收到ACK时，即可发送单播流数据，从而避免了因核心网网元未准备好进行UPF广播回传导致的单播流数据广播回传失败。
可选地，第一请求消息包括：单播流信息，单播流信息用于标识单播流数据的上行传输路径。
其中，上述单播流信息可以包括终端的会话标识(如PDU session ID)、流标识(如QoS流标识(QoS flow ID，QFI)，或5G服务质量标识(5G QoS identifier，5QI))、和单播UPF隧道标识中的至少一种。
示例性地，当单播流信息中包含流标识时，单播流信息可以用于指示该流标识对应的流的数据需要切换到下行广播传输；当单播流信息中只包含会话标识时，单播流信息可以用于指示该会话标识对应的会话中所有的流的数据都需要切换到下行广播传输；当单播流信息中包含UPF隧道标识时，单播流信息可以用于指示与该UPF隧道标识对应的数据需要转换到下行广播传输。
相应地，核心网可以根据单播流信息识别出单播流数据。
可选地，第一请求消息还包括广播流信息、MBS信息、通信区域信息和本地广播回传指示信息中的至少一个。
其中，广播流信息可以用于指示UPF本地广播回传的传输路径。例如，上述广播流信息是多媒体广播/组播服务SMF(multimedia broadcast/multicast service SMF，MBS)会话标识(MBS Session ID)和/或MBS承载标识(MBS Bearer ID)，其中，MBS会话标识也可称为广播会话标识，MBS承载标识也可以称为广波承载标识或广播路径标识或广播流标识，广播流标识对应于4G通信系统中的临时移动群组标识(temporary mobile subscriber identity，TMGI)，或者，广播流标识对应于4G通信系统中的TMGI和流标识(flow ID)。广播流标识用于标识接收同一业务的一组用户，一般这些用户位于该业务对应的网络区域如小区(Cell)，多媒体广播组播服务单频网(multimedia broadcast multicast service single frequency network，MBSFN)，广播服务区域等，因此广播流标识也可以被理解用于标识业务数据的网络传输区域(或者传输路径)。
其中，通信区域信息可以用于指示UPF本地广播回传的通信区域，也可以称为广播区域描述信息，可以是服务区域标识(service area identity，SAI)、E-UTRAN小区全局标识符(E-UTRAN cell global identifier，ECGI)或小区标识列表(cell ID list)、注册区域(registration area，RA)、追踪区域(tracing area，TA)、本地网络服务区域(local area data network service area)、或地理区域(如经纬度)等信息，还可以是终端当前位置与半径距离。E-UTRAN为演进型UMTS陆地无线接入网(evolved UMTS terrestrial radio access network)的缩写。
其中，本地广播回传指示信息可以用于指示对单播流数据执行UPF本地广播回传，该指示信息可以是一个比特位，在一种实现方式中，用于指示SMF终端的上行数据不必发送至V2X服务器，发送到对应的下行广播传输路径传输即可。在又一种实现方式中，该指示信息还可以指示SMF将终端的上行数据发送V2X服务器，同时另拷贝一份转到对应的下行广播传输路径传输即可。
示例性地，当第一请求消息包括广播流信息和/或通信区域信息时，核心网网元(可 以是SMF和广播会话管理网元)可以根据广播流信息和/或通信区域信息确定UPF本地广播回传的传输路径，无需再根据其它方法计算UPF本地广播回传的传输路径，减小了核心网的负载。
此外，本地广播回传指示信息可以通过显式方式指示对单播流数据执行UPF本地广播回传，进一步提高了本地广播回传的可靠性。
可选地，第一请求消息还包括广播会话管理网元的标识。该广播会话管理网元的标识可以是广播会话管理网元的名称，FQDN，URL，URI，IP地址，端口号等。
相应地，SMF可以根据广播会话管理网元的标识找到广播会话管理网元，交互信令消息。
其中，广播会话管理网元可以为管理UPF本地广播回传所使用的广播会话的网元。广播会话管理网元可以是具有广播会话管理功能的SMF，也可以是独立的网元，例如MBS。
图3示出了本申请提供的另一种传输数据的方法的示意图，该方法300包括：
S310，SMF接收来自终端的第一请求消息，该第一请求消息用于请求对单播流数据执行UPF本地广播回传。
其中，方法300中的第一请求消息与方法200中的第一请求消息相同，在此不再赘述。
在一个示例中，假设第一请求消息中携带有广播流信息或MBS信息，SMF将第一请求消息包含的内容发送给广播流信息或MBS信息对应的MBS。
其中，MBS信息可以是MBS的标识(如，MBS的名称，编号，正式域名(Fully Qualified Domain Name，FQDN))，MBS的地址(如，统一资源标识符(Uniform Resource Identifier，URI)，统一资源定位符(Uniform Resource Locator，URL)，IPv4/IPv6地址，端口号，或媒体存取控制地址(Media Access Control Address，MAC)等)。
在另一个示例中，第一请求消息不包含MBS会话标识或广播承载标识或MBS信息，SMF根据预设规则选择一个MBS，将上述请求消息发给所选的MBS。MBS收到该请求消息后，可以根据第一请求消息携带的通信区域信息确定新建广播承载，或者根据通信区域信息，和MBS会话标识或广播承载标识，更新广播承载。最后，SMF将新建或更新后的广播承载发送给终端。
在又一个示例中，SMF还可以接收其他消息(如终端请求广播承载消息)，从该消息中获取通信区域信息或MBS会话标识或广播承载标识或MBS信息，建立或者更新广播承载。
其中，SMF可以根据如下预设规则选择一个MBS：根据终端的位置选择距离该终端最近的MBS，或者，根据MBS的负载选择一个负载最轻的MBS，或者，根据第一请求消息中携带的通信区域信息选择一个MBS，例如，选择位于该通信区域信息对应的通信区域内，并且靠近通信区域中心位置的MBS。
S320，SMF向终端发送第一请求消息的响应消息。
上述实施例提供的方法，SMF接收来自终端的第一请求消息，并向终端发送第一请求消息的响应消息，可以实现终端单播会话对应的UPF不再将接收到的终端的单播流数据转发至AS，而是将接收到的单播流数据转发到广播会话对应的UPF在本地(即，广播会话对应的UPF，也是UPF广播回传所使用的广播传输路径对应的UPF)执行广播回传， 减少了单播流数据的传输路径的长度，从而减小了单播流数据的传输时延。
可选地，响应消息用于指示第一请求消息已被接受，具体可以参见图2所示实施例中的相关描述，不再赘述。
可选地，在上述方法的第一种实施场景下，方法300还包括：
S330，SMF确定广播会话管理网元。
该步骤(S330)为可选的步骤，其中，广播会话管理网元可以为管理UPF广播回传所使用的广播会话的网元。
S340，SMF根据第一请求消息向广播会话管理网元发送第二请求消息，第二请求消息用于获取执行UPF本地广播回传的UPF的信息。
其中，执行UPF本地广播回传的UPF的信息可以用于指示执行UPF本地广播回传的UPF，可以是执行UPF本地广播回传的UPF的标识，例如，地址，或名称等。
S350，SMF接收第二请求消息的响应消息，第二请求消息的响应消息包括标识执行UPF本地广播回传的UPF的信息。
其中，第二请求消息可以是V2X传输信道请求(V2V transport channel request)。
示例性地，SMF在接收到第一请求消息后，向广播会话管理网元发送第二请求消息，以获取执行UPF本地广播回传的UPF的信息，UPF的信息例如是UPF的标识，UPF的标识可以是UPF的地址或UPF的名称。
可选地，步骤S330可以采用如下两种实现方式：
方式一、当第一请求消息包括广播会话管理网元的标识时，SMF根据广播会话管理网元的标识确定广播会话管理网元。
方式二、当第一请求消息不包括广播会话管理网元的标识时，SMF根据预设规则确定广播会话管理网元。
其中，上述预设规则可以是选择一个距离终端最近的广播会话管理网元，或者，选择一个负载最小的广播会话管理网元，或者，选择一个位于终端指示的通信区域的中心位置的广播会话管理网元，因此，本实施例提供的技术方案可以灵活选择广播会话管理网元。
可选地，第二请求消息包括单播流信息，可以参见图2所示实施例中的相关描述，不再赘述。
相应地，广播会话管理网元可以根据单播流信息新建广播会话，创建用于UPF本地广播回传的广播传输路径，并获取本地广播回传的UPF的信息。单播流信息的描述可以参考方法200中的相关描述。
可选地，第二请求消息还包括广播流信息、通信区域信息和本地广播回传指示信息中的至少一个；其中，广播流信息用于指示UPF本地广播回传的广播传输路径，通信区域信息用于指示UPF本地广播回传的通信区域，本地广播回传指示信息用于指示对单播流数据执行UPF本地广播回传。上述信息的描述参考方法200中相应的信息的描述。
当第二请求消息包括广播流信息和通信区域信息时，广播会话管理网元可以根据广播流信息和通信区域信息确定UPF本地广播回传的传输路径和通信区域，无需再根据其它方法计算UPF本地广播回传的传输路径和通信区域，减小了广播会话管理网元的负载。此外，本地广播回传指示信息通过显式方式指示对单播流数据执行UPF本地广播回传，进一步提高了UPF本地广播回传的可靠性。
进一步可选地，方法300还包括：
S360，SMF向第一UPF发送第三请求消息，第三请求消息用于请求对单播流数据执行UPF本地广播回传。
其中，第一UPF为单播会话对应的UPF。此外，第三请求消息可以是上行转下行连接请求(UL-DL link request)，也可以是N4会话修改请求(N4 session modification request)，不予限制。
S370，SMF接收来自第一UPF的第三请求消息的响应消息。
SMF向单播会话对应的UPF发送第三请求消息，以便于网络侧对单播流数据执行UPF本地广播回传，即单播会话对应的UPF将收到的终端的单播流数据发送给第二UPF，第二UPF对收到的数据进行本地广播回传，第二UPF为执行UPF本地广播回传的UPF，从而可以实现UPF本地广播回传。
可选地，第三请求消息包括执行UPF本地广播回传的UPF的信息和单播流信息。执行UPF本地广播回传的UPF的信息和单播流信息的描述可参考方法200中的相关描述，此处不再赘述。
在一种实现方式中，该第三请求消息所包括的执行本地广播回传的UPF的信息和单播流信息可以用于第一UPF在接收到单播流数据后对该单播流数据进行封装后发送给第二UPF(即，执行UPF本地广播回传的UPF)，在又一种实现方式中，第三请求消息所包括的执行本地广播回传的UPF的信息和单播流信息可以用于第一UPF在接收到单播流数据后将该单播流数据直接转发给第二UPF。
图4示出了本申请提供的再一种传输数据的方法的示意图，该方法400包括：
S410，第一UPF接收来自SMF的第三请求消息，第三请求消息用于请求对单播流数据执行UPF本地广播回传。
其中，方法400中的第三请求消息与方法300中的第三请求消息相同，不再赘述。
S420，第一UPF向SMF发送第三请求消息的响应消息。
其中，第一UPF可以为管理单播会话的UPF，即为接收UE单播流数据的UPF，第一UPF接收到第三请求消息后，根据第三请求消息的指示确定对单播流数据执行UPF本地广播回传，后续当收到该单播流数据时，第一UPF执行UPF本地回传的流程，即，将收到的数据发送给第二UPF(即为执行UPF本地广播回传的UPF)，第二UPF可以通过广播路径将单播流数据发送给其他UE，从而实现了UPF本地广播回传。
可选地，上述实施例的一种实施场景下，第三请求消息包括执行UPF本地广播回传的UPF的信息和单播流信息，单播流信息用于标识单播流数据。
其中，在一种实现方式中，第三请求消息所包括的执行UPF本地广播回传的UPF的信息和单播流信息可以用于第一UPF在接收到单播流数据后对该单播流数据进行封装后发送给执行UPF本地广播回传的UPF(可以称之为第二UPF)。在一种实现方式中，第三请求消息所包括的执行UPF本地广播回传的UPF的信息和单播流信息可以用于第一UPF在接收到单播流数据后将该单播流数据直接转发给第二UPF。
进一步地，方法400还包括：
S430，第一UPF接收单播流数据。
S440，第一UPF根据第三请求消息中执行UPF本地广播回传的UPF的信息，向第二 UPF发送单播流数据。
其中，执行UPF本地广播回传的UPF的信息可以参见前述实施例中的相关描述。此外，第二UPF为该UPF本地广播回传的UPF的信息对应的UPF，即执行UPF本地广播回传的UPF。
示例性地，第一UPF在接收到单播流数据后，对该单播流数据进行封装后发送给第二UPF，或者，第一UPF在接收到单播流数据后将该单播流数据直接转发给第二UPF，从而实现了不需要经过AS的处理即可对待处理信息执行UPF本地回传广播。
图5示出了本申请提供的再一种传输数据的方法的示意图，该方法500包括：
S510，广播会话管理网元接收来自SMF的第二请求消息，第二请求消息用于获取执行UPF本地广播回传的UPF的信息。
S520，广播会话管理网元向SMF发送第二请求消息的响应消息，第二请求消息的响应消息包括执行UPF本地广播回传的UPF的信息。
其中，广播会话管理网元可以是UPF本地广播回传的广播会话对应的SMF，也可以是独立的网元，例如，MBS。
其中，执行UPF本地广播回传的UPF的信息可以参见前述实施例中的相关描述，不再赘述。
上述实施例提供的方法，广播会话管理网元通过接收到来自SMF的第二请求消息，并根据第二请求消息向SMF发送该执行UPF本地广播回传的UPF的信息，以便于SMF将执行UPF本地广播回传的UPF的信息发送给单播UPF，实现UPF本地广播回传，执行UPF本地广播回传的UPF的信息可以为新建或更新广播会话过程中获取的执行UPF本地广播回传的UPF的信息，该执行UPF本地广播回传的UPF的信息例如是UPF的标识，UPF的标识可以是UPF的地址或UPF的名称。
可选地，第二请求消息包括单播流信息，单播流信息用于标识单播流数据。
可选地，第二请求消息还包括广播流信息、通信区域信息和本地广播回传指示信息中的至少一个，其中，广播流信息用于指示UPF本地广播回传的传输路径，通信区域信息用于指示UPF本地广播回传的通信区域，本地广播回传指示信息用于指示对单播流数据执行UPF本地广播回传。
可选地，上述方法还包括：当第二请求消息包括广播流信息和通信区域信息时，广播会话管理网元根据广播流信息和通信区域信息确定UPF本地广播回传的传输路径和通信区域。
广播流信息指示传输路径，通信区域信息指示通信区域，广播会话管理网元可以根据广播流信息确定UPF本地广播回传的传输路径，根据通信区域信息确定UPF本地广播回传的通信区域，无需再根据其它方法计算UPF本地广播回传的传输路径和通信区域，减小了广播会话管理网元的负载。此外，本地广播回传指示信息通过明示方式指示对单播流数据执行UPF本地广播回传，进一步提高了UPF本地广播回传的可靠性。
可选地，500方法还包括：
S530，广播会话管理网元根据第二请求消息执行广播会话的建立或更新操作，该广播会话为UPF本地广播回传对应的会话。
可选地，S530包括:
广播会话管理网元根据广播流信息新建广播会话更新广播流信息标识的广播会话；或者，
广播会话管理网元根据通信区域信息新建或更新广播流信息标识的广播会话，广播会话的通信区域为通信区域信息指示的区域；或者，
广播会话管理网元根据本地广播回传指示信息新建广播会话或更新广播流信息标识的广播会话。
上述方案可以灵活实现新建广播会话或更新广播流标识的广播会话，改变通信区域。
图6示出了本申请提供的再一种传输数据的方法的示意图，该方法600包括：
S610，第二UPF接收来自第一UPF的单播流数据，第二UPF为执行UPF本地广播回传的UPF。
S620，第二UPF通过UPF本地广播回传对应的广播传输路径，广播单播流对应的数据。
上述实施例提供的方法，第一UPF在确定执行UPF本地广播回传后向第二UPF发送单播流数据，而不再向V2X服务器发送单播流数据，第二UPF为执行UPF本地广播回传的UPF，从而可以实现UPF本地广播回传。
可选地，方法600还包括：
S630，第二UPF接收广播会话建立消息或广播会话更新消息，所述广播会话建立消息用于请求建立UPF本地广播回传对应的广播传输路径，所述广播会话更新消息用于请求更新UPF本地广播回传对应的广播传输路径。其中，
S640，根据所述广播会话建立消息或所述广播会话更新消息建立或更新所述UPF本地广播回传对应的广播传输路径。
S641，根据所述广播会话更新信息，更新所述UPF本地广播回传对应的广播传输路径。
下面，将从消息交互的角度详细描述本申请提供的传输数据的方法。需要说明的是，下面的实施例均以V2X应用场景为例对本申请所提供的技术方案进行说明，但本申请所提供的技术方案的应用场景不限于此。
图7是本申请提供的一种传输数据的方法的示意性流程图。
方法700中，UE仅是与AMF或RAN进行通信的终端的一个例子，与AMF或RAN进行通信的终端还可以是车载通信设备。方法700包括：
S701，UE根据当前V2X业务特性(如V2X消息的类型，或者V2X应用的类型)决定改变传输范围。UE向SMF发送MBMS承载建立请求消息(该请求消息也可以称为UE请求广播承载建立(UE requested MBMS bearer))，MBMS是多媒体广播/组播服务(multimedia broadcast/multicast service)的缩写，该消息包括通信区域信息。通信区域信息用于指示通信的范围，也可以称为广播区域描述信息，可以是服务区域标识(service area identity，SAI)、E-UTRAN小区全局标识符(E-UTRAN cell global identifier，ECGI)或小区标识列表(cell ID list)、注册区域(registration area，RA)、追踪区域(tracing area，TA)、本地网络服务区域(local area data network service area)、地理区域(如经纬度)等信息，还可以是UE当前位置与半径距离。SMF将该消息发送给广播会话网元(如图7所示的MBS)。如果UE侧有可用的广播承载(也可以称为广播流)，则MBMS承载建立请求 消息还可以携带MBS会话标识(MBS session ID)或广播承载标识(对应于4G通信系统中的临时移动群组标识(Temporary Mobile Subscriber Identity，TMGI)，或者对应于4G通信系统中的临时移动群组标识和Flow ID，也可以称为广播流标识。用于标识接收同一业务的一组用户，一般这些用户位于该业务对应的网络区域如小区(Cell)，MBSFN，广播服务区域等，因此也可以理解用于标识业务数据的网络传输区域(或者传输路径))，可选地，MBMS承载建立请求消息还可以携带MBS信息(例如，MBS的标识(如MBS的名称，编号，正式域名(Fully Qualified Domain Name，FQDN)，地址(统一资源标识符(Uniform Resource Identifier，URI)，统一资源定位符(Uniform Resource Locator，URL)，IPv4/IPv6地址，端口号，媒体存取控制地址(Media Access Control Address，MAC))等)，用于SMF向MBS发送信令消息。
S702，网络侧执行广播承载更新或者广播承载建立过程。例如，如果S701的请求消息中携带MBS会话标识或广播承载标识或MBS信息，则SMF将请求转发给MBS会话标识或广播承载标识或MBS信息对应的MBS。如果S701的请求消息不包含MBS会话标识或广播承载标识或MBS信息，则SMF根据预设规则选择一个MBS，将上述请求消息转发给所选的MBS。MBS收到请求后，根据通信区域信息和MBS会话标识或广播承载标识或MBS信息确定新建广播承载或者更新广播承载，并将新建或更新后的广播承载发送给UE。
上述SMF可以根据如下预设规则选择一个MBS：根据UE位置选择距离UE当前位置较近的MBS，或者，根据MBS负载选择一个MBS负载最轻的MBS，或者，根据通信区域信息选择位于通信区域并且靠近中心位置的MBS。其中，若S701中MBMS承载建立请求消息不包含通信区域信息，则SMF可以根据前两个预设规则选择一个MBS。
S703，UE根据当前V2X业务特性(如V2X消息的类型，或者V2X应用的类型)决定使用上行转广播下行的传输方式，则UE向SMF发送V2X传输信道请求(V2X transport channel request)，该V2X传输信道请求(V2X transport channel request)即第一请求消息，V2X传输信道请求包括单播流信息，还可以包括广播流信息和UPF本地广播回传指示信息中的至少一种。上述广播流信息例如是MBS会话标识(MBS Session ID)和/或MBS承载标识(MBS Bearer ID)。上述单播流信息可以包括上行会话标识(如PDU session ID)、流标识(如QoS Flow ID,QFI，或者5G QoS Identifier,5QI)和单播UPF隧道标识中的至少一种，如果单播流信息中包含流标识，则单播流信息用于指示该流标识对应的流的数据需要切换到下行广播传输；如果单播流信息中只包含会话标识，则单播流信息用于指示该会话标识对应的会话中所有的流的数据都需要切换到下行广播传输；如果单播流信息中包含UPF隧道标识，则单播流信息用于指示与该UPF隧道标识对应的数据需要转换到下行广播传输。上述UPF本地广播回传指示信息用于指示SMF该UE的上行数据不必发送至V2X服务器(即，V2X AS)，直接转到对应的广播路径下行传输即可。在另一种可选的实现方式中，该UPF本地广播回传指示信息可以指示该UE的上行数据发送到V2X服务器，同时另外拷贝一份转到对应的广播路径下行传输即可。
S704，SMF向MBS发送V2X传输信道请求(V2X transport channel request)，即，第二请求消息，该V2X传输信道请求用于请求获取广播会话的UPF信息。该V2X传输信道请求可以包括单播流信息，还可以包括广播流信息和UPF本地广播回传指示信息中的 至少一种。
S705，MBS向SMF返回V2X传输信道响应(V2X transport channel response)，该V2X传输信道响应即第二请求消息的响应消息，该V2X传输信道响应包括广播UPF信息(UPF(multicast)info)。广播UPF信息用于标识广播UPF，广播UPF即执行UPF本地广播回传的UPF，也可以称为第二UPF，广播UPF信息可以包括以下信息中的至少一种：广播UPF的隧道标识、广播UPF的地址、广播用户面地址和端口号(用于单播UPF封装数据包)。MBS在S702中的广播会话的建立/更新过程获得上述广播UPF的信息。
S706，SMF向单播UPF(也可以称为第一UPF)发送上行转下行连接请求(UL-DL link request)，该上行转下行连接请求即第三请求消息，该上行转下行连接请求包括广播UPF信息和单播流信息，该上行转下行连接请求用于请求对上行数据进行本地回传(Local breakout)转广播下行，即，请求进行UPF本地广播回传。若S703中的单播流信息是流标识，则S706中的单播流信息即S703中的流标识；若S703中的单播流信息只包括会话标识，则S706中的单播流信息可以是该会话标识对应的全部的流的标识，此时，该会话标识对应的全部流标识也可以替换为该会话标识对应的核心网(core network，CN)隧道标识。
单播UPF收到上行转下行连接请求后，如果后续收到该UE对应的上行数据，则将上述数据转发给广播UPF。上行转下行连接请求还可以包括UPF本地广播回传指示信息用于指示SMF该UE的上行数据不必发送至V2X服务器(即，V2X AS)，直接转到对应的下行广播路径传输即可。在另一种可选的实现方式中，该UPF本地广播回传指示信息可以指示该UE的上行数据发送到V2X服务器，同时另外拷贝一份转到对应的广播路径下行传输即可，在这种方式下，单播UPF除了将数据转发给广播UPF，还将数据发送给V2X服务器。
S707，单播UPF向SMF发送上行转下行连接响应(UL-DL link response)，即，第三请求消息的响应消息，该响应信息用于确认单播UPF接受第三请求消息的请求。
S708，SMF向UE发送V2X传输信道响应(V2X transport channel response)，V2X传输信道响应即第一请求消息的响应消息，用于确认第一请求消息被成功处理。
S709，UE将上行V2X消息发送给单播UPF，单播UPF则进行数据包的封装或转发，将上行V2X消息发给广播UPF。广播UPF通过广播传输路径将该V2X消息发给其它UE。上述封装指的是单播UPF使用广播用户面地址和端口号将收到的上行V2X消息发送至广播UPF，上述转发指的是单播UPF将上行V2X消息发送至广播UPF，由广播UPF对接收到的上行V2X消息进行封装。
需要说明的是：如果SMF和MBS合并设立，则SMF和MBS之间的信令交互为内部实现，可以省略。如果单播UPF和广播UPF合设，则S709为内部实现。上述步骤可以相隔一段时间执行。
图8是本申请提供的另一种传输数据的方法的示意性流程图。
方法800中，UE仅是与AMF或RAN进行通信的终端的一个例子，与AMF或RAN进行通信的终端还可以是车载通信设备。方法800包括：
S801，UE根据当前V2X业务特性(如V2X消息的类型，或者V2X应用的类型)决定改变传输范围。则UE向SMF发送V2X传输信道请求(V2X transport channel request)， 该V2X传输信道请求即第一请求消息，V2X传输信道请求包括单播流信息，还可以包括广播流信息、通信区域信息和UPF本地广播回传指示信息中的至少一种。上述广播流信息例如是MBS会话标识(MBS Session ID)和/或MBS承载标识(MBS Bearer ID)。上述单播流信息可以包括上行会话标识(如PDU session ID)、流标识和单播UPF隧道标识(如QoS Flow ID,QFI，或者5G QoS Identifier,5QI)中的至少一种，如果单播流信息中包含流标识，则单播流信息用于指示该流标识对应的流的数据需要切换到下行广播传输；如果单播流信息中只包含会话标识，则单播流信息用于指示该会话标识对应的会话中所有的流的数据都需要切换到下行广播传输；如果单播流信息中包含UPF隧道标识，则单播流信息用于指示与该UPF隧道标识对应的数据需要转换到下行广播传输。上述UPF本地广播回传指示信息用于指示SMF该UE的上行数据不必发送至V2X服务器(即，V2X AS)，直接转到对应的广播路径下行传输即可。在另一种可选的实现方式中，该UPF本地广播回传指示信息可以指示该UE的上行数据发送到V2X服务器，同时另外拷贝一份转到对应的广播路径下行传输即可。
上述通信区域信息用于指示通信的范围，也可以称为广播区域描述信息，可以是服务区域标识(service area identity，SAI)、E-UTRAN小区全局标识符(E-UTRAN cell global identifier，ECGI)或小区标识列表(cell ID list)、注册区域(registration area，RA)、追踪区域(tracing area，TA)、本地网络服务区域(local area data network service area)、地理区域(如经纬度)等信息，还可以是UE当前位置和半径距离。SMF将该消息发送给广播会话网元(如图8所示的MBS)。如果UE侧有可用的广播承载(对应于4G通信系统中的临时移动群组标识(Temporary Mobile Subscriber Identity，TMGI)，或者对应于4G通信系统中的临时移动群组标识和Flow ID，也可以称为广播流标识。用于标识接收同一业务的一组用户，一般这些用户位于该业务对应的网络区域如小区(Cell)，MBSFN，广播服务区域等，因此也可以理解用于标识业务数据的网络传输区域(或者传输路径))，则V2X传输信道请求还可以携带MBS会话标识(MBS session ID)或广播承载标识(也可以称为广播流标识)，可选地，V2X传输信道请求还可以携带MBS信息(例如，MBS的标识(如MBS的名称，编号，正式域名(Fully Qualified Domain Name，FQDN)，地址(统一资源标识符(Uniform Resource Identifier，URI)，统一资源定位符(Uniform Resource Locator，URL)，IPv4/IPv6地址，端口号，媒体存取控制地址(Media Access Control Address，MAC))等)，用于SMF向MBS发送信令消息。
S802，SMF向MBS发送V2X传输信道请求(V2X transport channel request)，即，第二请求消息，该V2X传输信道请求用于请求获取广播会话的UPF信息。该V2X传输信道请求可以包括单播流信息，还可以包括广播流信息、单播流信息和UPF本地广播回传指示信息中的至少一种。
S803，网络侧执行广播承载更新或者广播承载建立过程。例如，如果S801的请求消息中携带MBS会话标识或广播承载标识或MBS信息，则SMF将请求转发给MBS会话标识或广播承载标识或MBS信息对应的MBS。如果S801的请求消息不包含MBS会话标识或广播承载标识或MBS信息，则SMF根据预设规则选择一个MBS，将上述请求消息转发给所选的MBS。MBS收到请求后，根据通信区域信息和MBS会话标识或广播承载标识或MBS信息确定新建广播承载或者更新广播承载，并将新建或更新后的广播承载发 送给UE。
上述SMF可以根据如下预设规则选择一个MBS：根据UE位置选择距离UE当前位置较近的MBS，或者，根据MBS负载选择一个MBS负载最轻的MBS，或者，根据通信区域信息选择位于通信区域并且靠近中心位置的MBS。其中，若S801中V2X传输信道请求不包含通信区域信息，则SMF可以根据前两个预设规则选择一个MBS。
S804，MBS向SMF返回V2X传输信道响应(V2V transport channel response)，该V2X传输信道响应即第二请求消息的响应消息，该V2X传输信道响应包括广播UPF信息(UPF(multicast)info)。广播UPF信息用于标识广播UPF，广播UPF即执行UPF本地广播回传的UPF，也可以称为第二UPF，广播UPF信息可以包括以下信息中的至少一种：广播UPF的隧道标识、广播UPF的地址、广播用户面地址和端口号(用于单播UPF封装数据包)。MBS在S803中的广播会话的建立/更新过程获得上述广播UPF的信息。
S805，SMF向单播UPF(也可以称为第一UPF)发送上行转下行连接请求(UL-DL link request)，该上行转下行连接请求即第三请求消息，该上行转下行连接请求包括广播UPF信息和单播流信息，该上行转下行连接请求用于请求对上行数据进行本地回传(Local breakout)转广播下行，即，请求进行UPF本地广播回传。若S801中的单播流信息是流标识，则S505中的单播流信息即S805中的流标识；若S801中的单播流信息只包括会话标识，则S805中的单播流信息可以是该会话标识对应的全部的流的标识，此时，该会话标识对应的全部流标识也可以替换为该会话标识对应的核心网(core network，CN)隧道标识。
单播UPF收到上行转下行连接请求后，如果后续收到该UE对应的上行数据，则将上述数据转发给广播UPF。上行转下行连接请求还可以包括UPF本地广播回传指示信息用于指示SMF该UE的上行数据不必发送至V2X服务器(即，V2X AS)，直接转到对应的下行广播路径传输即可。在另一种可选的实现方式中，该UPF本地广播回传指示信息可以指示该UE的上行数据发送到V2X服务器，同时另外拷贝一份转到对应的广播路径下行传输即可，在这种方式下，单播UPF除了将数据转发给广播UPF，还将数据发送给V2X服务器。
S806，单播UPF向SMF发送上行转下行连接响应(UL-DL link response)，即，第三请求消息的响应消息，该响应信息用于确认单播UPF接受第三请求消息的请求。
S807，SMF向UE发送V2X传输信道响应(V2X transport channel response)，V2X传输信道响应即第一请求消息的响应消息，用于确认第一请求消息被成功处理。
S808，UE将上行V2X消息发送给单播UPF，单播UPF则进行数据包的封装或转发，将上行V2X消息发给广播UPF。广播UPF通过广播传输路径将该V2X消息发给其它UE。上述封装指的是单播UPF使用广播用户面地址和端口号将收到的上行V2X消息发送至广播UPF，上述转发指的是单播UPF将上行V2X消息发送至广播UPF，由广播UPF对接收到的上行V2X消息进行封装。
需要说明的是：如果SMF和MBS合并设立，则SMF和MBS之间的信令交互为内部实现，可以省略。如果单播UPF和广播UPF合设，则S808为内部实现。上述各个步骤可以相隔一段时间执行。
图9是本申请提供的再一种传输数据的方法的示意性流程图。
方法900中，UE仅是与AMF或RAN进行通信的终端的一个例子，与AMF或RAN进行通信的终端还可以是车载通信设备。方法900包括：
S901，UE根据当前V2X业务特性(如V2X消息的类型，或者V2X应用的类型)决定改变传输范围。UE向SMF发送分组数据单元(packet data unit，PDU)会话修改请求(PDU session modification request)，该请求即第一请求消息，该请求包括单播流信息，还可以包括广播流信息、通信区域信息和UPF本地广播回传指示信息中的至少一种。上述广播流信息例如是MBS会话标识(MBS Session ID)和/或MBS承载标识(MBS Bearer ID)。上述单播流信息可以包括上行会话标识、流标识和单播UPF隧道标识中的至少一种，如果单播流信息中包含流标识(flow ID)，则单播流信息用于指示该流标识对应的流需要切换到下行广播传输；如果单播流信息中只包含会话标识(session ID)，则单播流信息用于指示该会话标识对应的会话中所有的流都需要切换到下行广播传输；如果单播流信息中包含UPF隧道标识，则单播流信息用于指示与该UPF隧道标识对应的数据需要转换到下行广播传输。上述UPF本地广播回传指示信息用于指示SMF该UE的上行数据不必发送至V2X服务器(即，AS)，直接转到对应的下行广播即可。在另一种可选的实现方式中，该UPF本地广播回传指示信息可以指示该UE的上行数据发送到V2X服务器，同时另外拷贝一份转到对应的广播路径下行传输即可。
上述通信区域信息用于指示通信的范围，也可以称为广播区域描述信息，可以是服务区域标识(service area identity，SAI)、E-UTRAN小区全局标识符(E-UTRAN cell global identifier，ECGI)或小区标识列表(cell ID list)、注册区域(registration area，RA)、追踪区域(tracing area，TA)、本地网络服务区域(local area data network service area)、地理区域(如经纬度)等信息，还可以是UE当前位置+半径距离。SMF将该消息发送给广播会话网元(如图9所示的MBS(MBMS SMF))。如果UE侧有可用的广播承载(也可以称为广播流)，则V2X传输信道请求还可以携带MBS会话标识(MBS session ID)或广播承载标识(也可以称为广播流标识)，可选地，V2X传输信道请求还可以携带MBS信息(例如，MBS的标识、地址、名称等)，用于SMF联系MBS。
对于SMF来说，SMF可以根据广播流信息、通信区域信息和UPF本地广播回传指示信息中的一种或多种确定消息的作用进而采取对应的动作。
S902，SMF向MBS发送V2X传输信道请求(即，第二请求消息)，该V2X传输信道请求用于获取广播会话的UPF信息，该UPF即为UPF本地广播回传所使用的广播传输路径的UPF。该V2X传输信道请求可以包括单播流信息，还可以包括广播流信息、单播流信息和UPF本地广播回传指示信息中的至少一种。MBS可以根据UPF本地广播回传指示信息和/或V2X传输信道请求的消息类型确定V2X传输信道请求的作用。
如果S901的请求消息中携带MBS会话标识或广播承载标识或MBS信息，则SMF将请求转发给MBS会话标识或广播承载标识或MBS信息对应的MBS。如果S901的请求消息不包含MBS会话标识或广播承载标识或MBS信息，则SMF根据预设规则选择一个MBS，将上述请求消息转发给所选的MBS。MBS收到请求后，根据通信区域信息和MBS会话标识或广播承载标识或MBS信息确定新建广播承载或者更新广播承载，并将新建或更新后的广播承载发送给UE。
上述SMF可以根据如下预设规则选择一个MBS：根据UE位置选择距离UE当前位 置较近的MBS，或者，根据MBS负载选择一个MBS负载最轻的MBS，或者，根据通信区域信息选择位于通信区域并且靠近中心位置的MBS。其中，若S901中MBMS承载建立请求消息不包含通信区域信息，则SMF可以根据前两个预设规则选择一个MBS。
S903，MBS收到V2X传输信道请求后，根据通信区域信息确定要新建广播承载(其中，该V2X传输信道请求中没有携带广播流信息或者MBS信息)或者要更新广播承载(其中，该V2X传输信道请求中携带了广播流信息或者MBS信息)，并将新建或更新后的广播承载发送给UE。在此过程中，MBS向广播UPF发送广播流信息、单播流信息和UPF本地广播回传指示信息中的至少一种，上述信息用于指示单播流信息对应的数据需要从广播流信息对应路径进行下行传输。
S904，MBS向SMF返回V2X传输信道响应(V2V transport channel response)，该V2X传输信道响应即第二请求消息的响应消息，该V2X传输信道响应包括广播UPF信息(UPF(multicast)info)。广播UPF信息用于标识广播UPF，广播UPF即执行UPF本地广播回传的UPF，也可以称为第二UPF，广播UPF信息可以包括以下信息中的至少一种：广播UPF的隧道标识、广播UPF的地址、广播用户面地址和端口号(用于单播UPF封装数据包)。MBS在S902中的广播会话的建立/更新过程获得上述广播UPF的信息。
S905，SMF向单播UPF(也可以称为第一UPF)发送N4会话修改请求(N4 session modification request)，该N4会话修改请求即第三请求消息，该N4会话修改请求包括广播UPF信息和单播流信息，该N4会话修改请求用于请求上行数据本地回传(Local breakout)转广播下行，即，请求进行UPF本地广播回传。当S901中的单播流信息是流标识，则S905中的单播流信息即S901中的流标识；当S901中的单播流信息只包括会话标识，则S905中的单播流信息可以是该会话标识对应的全部流标识，此时，该会话标识对应的全部流标识也可以替换为该会话标识对应的核心网(core network，CN)隧道标识。
单播UPF收到上行转下行连接请求后，如果后续收到该UE对应的上行数据，则将上述数据转发给广播UPF。上行转下行连接请求还可以包括UPF本地广播回传指示信息用于指示SMF该UE的上行数据不必发送至V2X服务器(即，V2X AS)，直接转到对应的下行广播传输路径传输即可。在另一种可选的实现方式中，该UPF本地广播回传指示信息可以指示该UE的上行数据发送到V2X服务器，同时另外拷贝一份转到对应的下行广播路径传输即可，在这种方式下，单播UPF除了将数据转发给广播UPF，还将数据发送给V2X服务器。
S906，单播UPF向SMF发送N4会话修改响应(N4 session modification response)，即，第三请求消息的响应消息，该响应信息用于确认单播UPF接受第三请求消息的请求。
S907，SMF向UE发送PDU会话修改响应(PDU session modification response)，PDU会话修改响应即第一请求消息的响应消息，用于确认第一请求消息被成功处理。
S908，UE将上行V2X消息发送给单播UPF，单播UPF则进行数据包的封装或转发，将上行V2X消息发给广播UPF。广播UPF用广播承载将该V2X消息发给其它UE。上述封装指的是单播UPF使用广播用户面地址和端口号将上行V2X消息发送至广播UPF，上述转发指的是单播UPF将上行V2X消息发送至广播UPF，由广播UPF对上行V2X消息进行封装。
需要说明的是：如果SMF和MBS合并设立，则SMF和MBS之间的信令交互为内部实现，可以省略。如果单播UPF和广播UPF合设，则S908为内部实现。上述步骤可以相隔一段时间执行。
图10是本申请提供的一种传输数据的方法的示意性流程图。
方法1000中，UE仅是与AMF或RAN进行通信的终端的一个例子，与AMF或RAN进行通信的终端还可以是车载通信设备。方法1000包括：
S1001，UE根据当前V2X业务特性(如V2X消息的类型，或者V2X应用的类型)决定改变传输范围。UE向SMF发送MBMS承载建立请求消息，该消息包括通信区域信息。通信区域信息用于指示通信的范围，也可以称为广播区域描述信息，可以是服务区域标识(service area identity，SAI)、E-UTRAN小区全局标识符(E-UTRAN cell global identifier，ECGI)或小区标识列表(cell ID list)、注册区域(registration area，RA)、追踪区域(tracing area，TA)、本地网络服务区域(local area data network service area)、地理区域(如经纬度)等信息，还可以是UE当前位置+半径距离。SMF将该消息发送给广播会话网元(如图10所示的MBS)。如果UE侧有可用的广播承载(也可以称为广播流)，则MBMS承载建立请求消息还可以携带MBS会话标识(MBS session ID)或广播承载标识(也可以称为广播流标识)，可选地，MBMS承载建立请求消息还可以携带MBS信息(例如，MBS的标识、地址、名称等)，用于SMF联系MBS。
S1002，网络侧执行广播承载更新或者广播承载建立过程。例如，如果S1001的请求消息中携带MBS会话标识或广播承载标识或MBS信息，则SMF将请求转发给MBS会话标识或广播承载标识或MBS信息对应的MBS。如果S1001的请求消息不包含MBS会话标识或广播承载标识或MBS信息，则SMF根据预设规则选择一个MBS，将上述请求消息转发给所选的MBS。MBS收到请求后，根据通信区域信息和MBS会话标识或广播承载标识或MBS信息确定新建广播承载或者更新广播承载，并将新建或更新后的广播承载发送给UE。
上述SMF可以根据如下预设规则选择一个MBS：根据UE位置选择距离UE当前位置较近的MBS，或者，根据MBS负载选择一个MBS负载最轻的MBS，或者，根据通信区域信息选择位于通信区域并且靠近中心位置的MBS。其中，若S1001中MBMS承载建立请求消息不包含通信区域信息，则SMF可以根据前两个预设规则选择一个MBS。
S1003，UE根据当前V2X业务特性(如V2X消息的类型，或者V2X应用的类型)决定使用上行转广播下行的传输方式，则UE向SMF发送PDU会话修改请求(PDU session modification request)，该PDU会话修改请求即第一请求消息，V2X传输信道请求包括单播流信息，还可以包括广播流信息和UPF本地广播回传指示信息中的至少一种。上述广播流信息例如是MBS会话标识(MBS Session ID)和/或MBS承载标识(MBS Bearer ID)。上述单播流信息可以包括上行会话标识、流标识和单播UPF隧道标识中的至少一种，如果单播流信息中包含流标识(flow ID)，则单播流信息用于指示该流标识对应的流需要切换到下行广播传输；如果单播流信息中只包含会话标识(session ID)，则单播流信息用于指示该会话标识对应的会话中所有的流都需要切换到下行广播传输；如果单播流信息中包含UPF隧道标识，则单播流信息用于指示与该UPF隧道标识对应的数据需要转换到下行广播传输。上述UPF本地广播回传指示信息用于指示SMF该UE的上行数据不必发送至 V2X服务器(即，AS)，直接转到对应的下行广播即可。在另一种可选的实现方式中，该UPF本地广播回传指示信息可以指示该UE的上行数据发送到V2X服务器，同时另外拷贝一份转到对应的广播路径下行传输即可。
S1004，SMF向MBS发送V2X传输信道请求(即，第二请求消息)，该V2X传输信道请求用于建立单播流和广播流的关联关系，并请求获取广播会话的UPF信息。该V2X传输信道请求可以包括单播流信息，还可以包括广播流信息、单播流信息和UPF本地广播回传指示信息中的至少一种。
S1005，MBS建立单播流和广播流的关联关系，具体实现时可以是MBS将单播流信息与广播流信息进行映射或者绑定。MBS向SMF返回V2X传输信道响应(V2V transport channel response)，该V2X传输信道响应即第二请求消息的响应消息，该V2X传输信道响应包括广播UPF信息(UPF(multicast)info)。广播UPF信息用于标识广播UPF，广播UPF即执行UPF本地广播回传的UPF，也可以称为第二UPF，广播UPF信息可以包括以下信息中的至少一种：广播UPF的隧道标识、广播UPF的地址、广播用户面地址和端口号(用于单播UPF封装数据包)。MBS在S1002中的广播会话的建立/更新过程获得上述广播UPF的信息。
S1006，SMF向单播UPF(也可以称为第一UPF)发送N4会话修改请求(N4 session modification request)，该N4会话修改请求即第三请求消息，该N4会话修改请求包括广播UPF信息和单播流信息，该N4会话修改请求用于请求上行数据本地回传(Local breakout)转广播下行，即，请求进行UPF本地广播回传。若S1003中的单播流信息是流标识，则S1006中的单播流信息即S1003中的流标识；若S1003中的单播流信息只包括会话标识，则S1006中的单播流信息可以是该会话标识对应的全部流标识，此时，该会话标识对应的全部流标识也可以替换为该会话标识对应的核心网(core network，CN)隧道标识。
单播UPF收到上行转下行连接请求后，如果后续收到该UE对应的上行数据，则将上述数据转发给广播UPF。上行转下行连接请求还可以包括UPF本地广播回传指示信息用于指示SMF该UE的上行数据不必发送至V2X服务器(即，AS)，直接转到对应的下行广播即可。在另一种可选的实现方式中，该UPF本地广播回传指示信息可以指示该UE的上行数据发送到V2X服务器，同时另外拷贝一份转到对应的广播路径下行传输即可，在这种方式下，单播UPF除了将数据转发给广播UPF，还将数据发送给V2X服务器。
S1007，单播UPF向SMF发送N4会话修改响应(N4 session modification response)，即，第三请求消息的响应消息，该N4会话修改响应用于确认单播UPF接受第三请求消息的请求。
S1008，SMF向UE发送PDU会话修改响应(PDU session modification response)，PDU会话修改响应即第一请求消息的响应消息，用于确认第一请求消息被成功处理。
S1009，UE将上行V2X消息发送给单播UPF，单播UPF则进行数据包的封装或转发，将上行V2X消息发给广播UPF。广播UPF用广播承载将该V2X消息发给其它UE。上述封装指的是单播UPF使用广播用户面地址和端口号将上行V2X消息发送至广播UPF，上述转发指的是单播UPF将上行V2X消息发送至广播UPF，由广播UPF对上行V2X消息进行封装。
需要说明的是：如果SMF和MBS合并设立，则SMF和MBS之间的信令交互为内部实现，可以省略。如果单播UPF和广播UPF合设，则S1009为内部实现。上述步骤可以相隔一段时间执行。
下面再举一个SMF和MBS合并设立的情况下，本申请提供的传输数据的方法。
图11是本申请提供的一种传输数据的方法的示意性流程图。
方法1100中，UE仅是与AMF或RAN进行通信的终端的一个例子，与AMF或RAN进行通信的终端还可以是车载通信设备。方法1100包括：
S1101，UE根据当前V2X业务特性(如V2X消息的类型，或者V2X应用的类型)决定改变传输范围。UE向SMF发送MBMS承载建立请求消息，该消息可以包括通信区域信息。通信区域信息用于指示通信的范围，也可以称为广播区域描述信息，可以是服务区域标识(service area identity，SAI)、E-UTRAN小区全局标识符(E-UTRAN cell global identifier，ECGI)或小区标识列表(cell ID list)、注册区域(registration area，RA)、追踪区域(tracing area，TA)、本地网络服务区域(local area data network service area)、地理区域(如经纬度)等信息，还可以是UE当前位置+半径距离。SMF将该消息发送给广播会话网元(如图7所示的MBS(MBMS SMF))。如果UE侧有可用的广播承载(也可以称为广播流)，则MBMS承载建立请求消息还可以携带MBS会话标识(MBS session ID)或广播承载标识(也可以称为广播流标识)。步骤S1101为可选步骤。
S1102，网络侧执行广播承载更新或者广播承载建立过程。例如，如果S1101的请求消息中携带MBS会话标识或广播承载标识或通信区域信息，SMF根据通信区域信息和MBS会话标识或广播承载标识确定新建广播承载或者更新广播承载，并将新建或更新后的广播承载发送给UE。该步骤为可选的步骤。
S1103，UE根据当前V2X业务特性(如V2X消息的类型，或者V2X应用的类型)决定使用上行转广播下行的传输方式，则UE向SMF发送第一请求消息，该第一请求消息可以是V2X传输信道请求(V2V transport channel request)或者PDU会话更新请求(PDUsession modification request)，该请求包括单播流信息，还可以包括广播流信息和UPF本地广播回传指示信息中的至少一种。上述广播流信息例如是MBS会话标识(MBS Session ID)和/或MBS承载标识(MBS Bearer ID)。上述单播流信息可以包括上行会话标识、流标识和单播UPF隧道标识中的至少一种，当单播流信息中包含流标识(flow ID)，则单播流信息用于指示该流标识对应的流需要切换到下行广播传输；当单播流信息中包含会话标识(session ID)，则单播流信息用于指示该会话标识对应的会话中所有的流都需要切换到下行广播传输；当单播流信息中包含UPF隧道标识，则单播流信息用于指示与该UPF隧道标识对应的数据需要转换到下行广播传输。上述UPF本地广播回传指示信息用于指示SMF该UE的上行数据不必发送至V2X服务器(即，AS)，直接转到对应的下行广播即可。在另一种可选的实现方式中，该UPF本地广播回传指示信息可以指示该UE的上行数据发送到V2X服务器，同时另外拷贝一份转到对应的广播路径下行传输即可。该消息还可以包括通信区域信息。通信区域信息的描述同S1101。步骤S1102也可以放在步骤S1103之后执行。
S1104，SMF向单播UPF(也可以称为第一UPF)发送第三请求消息，第三请求消息可以是上行转下行连接请求(UL-DL link request)，该请求包括执行本地广播回传的UPF 的信息和单播流信息，该请求用于请求上行单播流数据本地回传(Local breakout)转广播下行，即，请求对单播流数据进行UPF本地广播回传。若S1103中的单播流信息是流标识，则S1104中的单播流信息即S1103中的流标识；若S1103中的单播流信息只包括会话标识，则S1104中的单播流信息可以是该会话标识对应的全部流标识，此时，该会话标识对应的全部流标识也可以替换为该会话标识对应的核心网(core network，CN)隧道标识。
单播UPF收到上行转下行连接请求后，如果后续收到该UE对应的上行单播流数据，则将上述单播流数据转发给广播UPF。在另一种选的实现方式中，上行转下行连接请求还可以包括UPF本地广播回传指示信息用于指示SMF该UE的上行数据不必发送至V2X服务器(即，AS)，直接转到对应的下行广播即可。在另一种可选的实现方式中，该UPF本地广播回传指示信息可以指示该UE的上行数据发送到V2X服务器，同时另外拷贝一份转到对应的广播路径下行传输即可，在这种方式下，单播UPF除了将单播流数据转发给广播UPF，还将数据发送给V2X服务器。单播UPF向广播UPF发送数据的处理方式同前面实施例的描述。
S1105，单播UPF向SMF发送第三请求消息的响应消息，该第三请求消息的响应消息可以是上行转下行连接响应(UL-DL link response)，即，，该上行转下行连接响应用于确认单播UPF接受第三请求消息的请求。
S1106，SMF向UE发送第一请求消息的响应消息，该第一请求消息的响应消息可以是V2X传输信道响应(V2X transport channel response)或者PDU会话修改响应(PDU session modification response)，用于确认第一请求消息被成功处理。
S1107，UE将上行V2X消息发送给单播UPF，单播UPF则进行数据包的封装或转发，将上行V2X消息发给广播UPF。广播UPF用广播承载将该V2X消息发给其它UE。上述封装指的是单播UPF使用广播用户面地址和端口号将上行V2X消息发送至广播UPF，上述转发指的是单播UPF将上行V2X消息发送至广播UPF，由广播UPF对上行V2X消息进行封装。
需要说明的是：如果单播UPF和广播UPF合设，则S1107为内部实现。上述步骤可以相隔一段时间执行。
上文详细介绍了本申请提供的传输数据的方法示例。可以理解的是，各个网元为了实现上述功能，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。
本申请可以根据上述方法示例对各个网元进行功能单元的划分，例如，可以对应各个功能划分各个功能单元，也可以将两个或两个以上的功能集成在一个处理单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。需要说明的是，本申请中对单元的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。
在采用集成的单元的情况下，图12示出了上述实施例中所涉及的终端的一种可能的 结构示意图。终端1200包括：处理单元1202和通信单元1203。处理单元1202用于对终端1200的动作进行控制管理，例如，处理单元1202用于支持终端1200执行图2的各个步骤和/或用于本文所描述的技术的其它过程。通信单元1203用于支持终端1200与其它网元的通信，例如与RAN之间的通信。终端1200还可以包括存储单元1201，用于存储终端1200的程序代码和数据。
例如，处理单元1202用于控制通信单元1203执行下述步骤：
向SMF发送第一请求消息，所述第一请求消息用于请求对单播流数据执行UPF本地广播回传；
接收所述第一请求消息的响应消息。
其中，处理单元1202可以是处理器或控制器，例如可以是中央处理器(central processing unit，CPU)，通用处理器，数字信号处理器(digital signal processor，DSP)，专用集成电路(application-specific integrated circuit，ASIC)，现场可编程门阵列(field programmable gate array，FPGA)或者其他可编程逻辑器件、晶体管逻辑器件、硬件部件或者其任意组合。其可以实现或执行结合本申请公开内容所描述的各种示例性的逻辑方框，模块和电路。所述处理器也可以是实现计算功能的组合，例如包含一个或多个微处理器组合，DSP和微处理器的组合等等。通信单元1203可以是收发器、收发电路等。存储单元1201可以是存储器。
当处理单元1202为处理器，通信单元1203为收发器，存储单元1201为存储器时，本申请所涉及的终端可以为图13所示的终端。
参阅图13所示，该终端1300包括：处理器1302、收发器1303、存储器1301。其中，收发器1303、处理器1302以及存储器1301可以通过内部连接通路相互通信，传递控制和/或数据信号。
所属领域的技术人员可以清楚地了解到，为了描述的方便和简洁，上述描述的装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不加赘述。
本申请提供的终端1200和终端1300，能够减小需要在小范围内广播的单播流数据的传输时延。
在采用集成的单元的情况下，图14示出了上述实施例中所涉及的SMF的一种可能的结构示意图。SMF1400包括：处理单元1402和通信单元1403。处理单元1402用于对SMF1400的动作进行控制管理，例如，处理单元1402用于支持SMF1400通过通信单元1403执行图3的各个步骤和/或用于本文所描述的技术的其它过程。通信单元1403用于支持SMF1400与其它网络实体的通信，例如与第一UPF之间的通信。SMF1400还可以包括存储单元1401，用于存储SMF1400的程序代码和数据。
例如，处理单元1402用于控制通信单元1403执行下述步骤：
接收来自终端的第一请求消息，该第一请求消息用于请求对单播流数据执行UPF本地广播回传；
向终端发送第一请求消息的响应消息。
其中，处理单元1402可以是处理器或控制器，例如可以是CPU，通用处理器，DSP，ASIC，FPGA或者其他可编程逻辑器件、晶体管逻辑器件、硬件部件或者其任意组合。其可以实现或执行结合本申请公开内容所描述的各种示例性的逻辑方框，模块和电路。所述 处理器也可以是实现计算功能的组合，例如包含一个或多个微处理器组合，DSP和微处理器的组合等等。通信单元1403可以是通信接口、收发电路等。存储单元1401可以是存储器。
当处理单元1402为处理器，通信单元1403为通信接口，存储单元1401为存储器时，本申请所涉及的SMF可以为图15所示的SMF。
参阅图15所示，该SMF1500包括：处理器1502、通信接口1503、存储器1501。其中，通信接口1503、处理器1502以及存储器1501可以通过内部连接通路相互通信，传递控制和/或数据信号。
所属领域的技术人员可以清楚地了解到，为了描述的方便和简洁，上述描述的装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不加赘述。
本申请提供的数据传输的SMF1400和SMF1500，能够减小需要在小范围内广播的单播流数据的传输时延。
在采用集成的单元的情况下，图16示出了上述实施例中所涉及的第一UPF的一种可能的结构示意图。第一UPF1600包括：处理单元1602和通信单元1603。处理单元1602用于对第一UPF1600的动作进行控制管理，例如，处理单元1602用于支持第一UPF1600通过通信单元1603执行图4的各个步骤和/或用于本文所描述的技术的其它过程。通信单元1603用于支持第一UPF1600与其它网络实体的通信，例如与SMF之间的通信。第一UPF1600还可以包括存储单元1601，用于存储第一UPF1600的程序代码和数据。
例如，处理单元1602用于控制通信单元1603执行下述步骤：
接收来自SMF的第三请求消息，第三请求消息用于请求对单播流数据执行UPF本地广播回传；
向SMF发送第三请求消息的响应消息。
其中，处理单元1602可以是处理器或控制器，例如可以是CPU，通用处理器，DSP，ASIC，FPGA或者其他可编程逻辑器件、晶体管逻辑器件、硬件部件或者其任意组合。其可以实现或执行结合本申请公开内容所描述的各种示例性的逻辑方框，模块和电路。所述处理器也可以是实现计算功能的组合，例如包含一个或多个微处理器组合，DSP和微处理器的组合等等。通信单元1603可以是通信接口、收发电路等。存储单元1601可以是存储器。
当处理单元1602为处理器，通信单元1603为通信接口，存储单元1601为存储器时，本申请所涉及的第一UPF可以为图17所示的第一UPF。
参阅图17所示，该第一UPF1700包括：处理器1702、通信接口1703、存储器1701。其中，通信接口1703、处理器1702以及存储器1701可以通过内部连接通路相互通信，传递控制和/或数据信号。
所属领域的技术人员可以清楚地了解到，为了描述的方便和简洁，上述描述的装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不加赘述。
本申请提供的数据传输的第一UPF1600和第一UPF1700，能够减小需要在小范围内广播的单播流数据的传输时延。
在采用集成的单元的情况下，图18示出了上述实施例中所涉及的广播会话管理网元的一种可能的结构示意图。广播会话管理网元1800包括：处理单元1802和通信单元1803。 处理单元1802用于对广播会话管理网元1800的动作进行控制管理，例如，处理单元1802用于支持广播会话管理网元1800通过通信单元1803执行图5的各个步骤和/或用于本文所描述的技术的其它过程。通信单元1803用于支持广播会话管理网元1800与其它网络实体的通信，例如与SMF之间的通信。广播会话管理网元1800还可以包括存储单元1801，用于存储广播会话管理网元1800的程序代码和数据。
例如，处理单元1802用于控制通信单元1803执行下述步骤：
接收来自SMF的第二请求消息，第二请求消息用于获取执行UPF本地广播回传的UPF的信息；
向SMF发送第二请求消息的响应消息，第二请求消息的响应消息包括标识执行UPF本地广播回传的UPF的信息。
其中，处理单元1802可以是处理器或控制器，例如可以是CPU，通用处理器，DSP，ASIC，FPGA或者其他可编程逻辑器件、晶体管逻辑器件、硬件部件或者其任意组合。其可以实现或执行结合本申请公开内容所描述的各种示例性的逻辑方框，模块和电路。所述处理器也可以是实现计算功能的组合，例如包含一个或多个微处理器组合，DSP和微处理器的组合等等。通信单元1803可以是通信接口、收发电路等。存储单元1801可以是存储器。
当处理单元1802为处理器，通信单元1803为通信接口，存储单元1801为存储器时，本申请所涉及的广播会话管理网元可以为图19所示的广播会话管理网元。
参阅图19所示，该广播会话管理网元1900包括：处理器1902、通信接口1903、存储器1901。其中，通信接口1903、处理器1902以及存储器1901可以通过内部连接通路相互通信，传递控制和/或数据信号。
所属领域的技术人员可以清楚地了解到，为了描述的方便和简洁，上述描述的装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不加赘述。
本申请提供的数据传输的广播会话管理网元1800和广播会话管理网元1900，能够减小需要在小范围内广播的单播流数据的传输时延。
在采用集成的单元的情况下，图20示出了上述实施例中所涉及的第二UPF的一种可能的结构示意图。第二UPF2000包括：处理单元2002和通信单元2003。处理单元2002用于对第二UPF2000的动作进行控制管理，例如，处理单元2002用于支持第二UPF2000通过通信单元2003执行图6的各个步骤和/或用于本文所描述的技术的其它过程。通信单元2003用于支持第二UPF2000与其它网络实体的通信，例如与第一UPF之间的通信。第二UPF2000还可以包括存储单元2001，用于存储第二UPF2000的程序代码和数据。
例如，处理单元2002用于控制通信单元2003执行下述步骤：
接收来自第一UPF的单播流数据，第二UPF为执行UPF本地广播回传的UPF；
通过UPF本地广播回传对应的会话广播单播流对应的数据。
其中，处理单元2002可以是处理器或控制器，例如可以是CPU，通用处理器，DSP，ASIC，FPGA或者其他可编程逻辑器件、晶体管逻辑器件、硬件部件或者其任意组合。其可以实现或执行结合本申请公开内容所描述的各种示例性的逻辑方框，模块和电路。所述处理器也可以是实现计算功能的组合，例如包含一个或多个微处理器组合，DSP和微处理器的组合等等。通信单元2003可以是通信接口、收发电路等。存储单元2001可以是存储 器。
当处理单元2002为处理器，通信单元2003为通信接口，存储单元2001为存储器时，本申请所涉及的第二UPF可以为图21所示的第二UPF。
参阅图21所示，该第二UPF2100包括：处理器2102、通信接口2103、存储器2101。其中，通信接口2103、处理器2102以及存储器2101可以通过内部连接通路相互通信，传递控制和/或数据信号。
所属领域的技术人员可以清楚地了解到，为了描述的方便和简洁，上述描述的装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不加赘述。
本申请提供的数据传输的第二UPF2000和第二UPF2100，能够减小需要在小范围内广播的单播流数据的传输时延。
在本申请各个实施例中，各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请的实施过程构成任何限定。
另外，本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
结合本申请公开内容所描述的方法或者算法的步骤可以硬件的方式来实现，也可以是由处理器执行软件指令的方式来实现。软件指令可以由相应的软件模块组成，软件模块可以被存放于随机存取存储器(random access memory，RAM)、闪存、只读存储器(read only memory，ROM)、可擦除可编程只读存储器(erasable programmable ROM，EPROM)、电可擦可编程只读存储器(electrically EPROM，EEPROM)、寄存器、硬盘、移动硬盘、只读光盘(CD-ROM)或者本领域熟知的任何其它形式的存储介质中。一种示例性的存储介质耦合至处理器，从而使处理器能够从该存储介质读取信息，且可向该存储介质写入信息。当然，存储介质也可以是处理器的组成部分。处理器和存储介质可以位于ASIC中。另外，该ASIC可以位于终端设备或核心网网元中。当然，处理器和存储介质也可以作为分立组件存在于终端设备或核心网网元中。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本申请所述的流程或功能。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，或者通过所述计算机可读存储介质进行传输。所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，(例如，软盘、硬盘、磁带)、光介质(例如，数字通用光盘(digital versatile disc，DVD)、或者半导体介质(例如固态硬盘(solid state disk，SSD))等。
以上所述的具体实施方式，对本申请的目的、技术方案和有益效果进行了进一步详细说明，所应理解的是，以上所述仅为本申请的具体实施方式而已，并不用于限定本申请的 保护范围，凡在本申请的技术方案的基础之上，所做的任何修改、等同替换、改进等，均应包括在本申请的保护范围之内。

Claims (44)

  1. 一种传输数据的方法，其特征在于，包括：
    终端向会话管理功能SMF发送第一请求消息，所述第一请求消息用于请求对单播流数据执行用户面功能UPF本地广播回传；
    所述终端接收所述第一请求消息的响应消息。
  2. 根据权利要求1所述的方法，其特征在于，所述响应消息用于指示所述第一请求消息已被接受。
  3. 根据权利要求1或2所述的方法，其特征在于，所述第一请求消息包括：单播流信息，所述单播流信息用于标识所述单播流数据。
  4. 根据权利要求3所述的方法，其特征在于，所述第一请求消息还包括广播流信息、通信区域信息和本地广播回传指示信息中的至少一个；
    其中，所述广播流信息用于指示UPF本地广播回传的传输路径，所述通信区域信息用于指示UPF本地广播回传的通信区域，所述本地广播回传指示信息用于指示对所述单播流数据执行UPF本地广播回传。
  5. 根据权利要求3或4所述的方法，其特征在于，所述第一请求消息还包括广播会话管理网元的标识。
  6. 一种传输数据的方法，其特征在于，包括：
    会话管理功能SMF接收来自终端的第一请求消息，所述第一请求消息用于请求对单播流数据执行用户面功能UPF本地广播回传；
    所述SMF向终端发送所述第一请求消息的响应消息。
  7. 根据权利要求6所述的方法，其特征在于，所述响应消息用于指示所述第一请求消息已被接受。
  8. 根据权利要求6或7所述的方法，其特征在于，所述第一请求消息包括：单播流信息，所述单播流信息用于标识所述单播流数据。
  9. 根据权利要求8所述的方法，其特征在于，所述第一请求消息还包括广播流信息、通信区域信息和本地广播回传指示信息中的至少一个；
    其中，所述广播流信息用于指示UPF本地广播回传的传输路径，所述通信区域信息用于指示UPF本地广播回传的通信区域，所述本地广播回传指示信息用于指示对所述单播流数据执行UPF本地广播回传。
  10. 根据权利要求8或9所述的方法，其特征在于，所述第一请求消息还包括广播会话管理网元的标识。
  11. 根据权利要求8至10中任一项所述的方法，其特征在于，所述方法还包括：
    所述SMF根据所述第一请求消息向所述广播会话管理网元发送第二请求消息，所述第二请求消息用于获取执行UPF本地广播回传的UPF的信息；
    所述SMF接收所述第二请求消息的响应消息，所述第二请求消息的响应消息包括执行UPF本地广播回传的UPF的信息。
  12. 根据权利要求11所述的方法，其特征在于，所述SMF确定广播会话管理网元， 包括：
    当所述第一请求消息包括所述广播会话管理网元的标识时，所述SMF根据所述广播会话管理网元的标识确定所述广播会话管理网元；或者，
    当所述第一请求消息不包括所述广播会话管理网元的标识时，所述SMF根据预设规则确定所述广播会话管理网元。
  13. 根据权利要求11或12所述的方法，其特征在于，所述第二请求消息包括所述单播流信息。
  14. 根据权利要求13所述的方法，其特征在于，所述第二请求消息还包括广播流信息、通信区域信息和本地广播回传指示信息中的至少一个；
    其中，所述广播流信息用于指示UPF本地广播回传的传输路径，所述通信区域信息用于指示UPF本地广播回传的通信区域，所述本地广播回传指示信息用于指示对所述单播流数据执行UPF本地广播回传。
  15. 根据权利要求11至14中任一项所述的方法，其特征在于，所述方法还包括：
    所述SMF向第一UPF发送第三请求消息，所述第三请求消息用于请求对所述单播流数据执行UPF本地广播回传；
    所述SMF接收来自所述第一UPF的所述第三请求消息的响应消息。
  16. 根据权利要求15所述的方法，其特征在于，所述第三请求消息包括执行UPF本地广播回传的UPF的信息和所述单播流信息。
  17. 一种传输数据的方法，其特征在于，包括：
    第一用户面功能UPF接收来自会话管理功能SMF的第三请求消息，所述第三请求消息用于请求对单播流数据执行UPF本地广播回传；
    所述第一UPF向所述SMF发送所述第三请求消息的响应消息。
  18. 根据权利要求17所述的方法，其特征在于，所述第三请求消息包括执行UPF本地广播回传的UPF的信息和单播流信息，所述单播流信息用于标识所述单播流数据。
  19. 根据权利要求18所述的方法，其特征在于，所述方法还包括：
    所述第一UPF接收所述单播流数据；
    所述第一UPF根据所述执行UPF本地广播回传的UPF的信息向第二UPF发送所述单播流数据，所述第二UPF为执行UPF本地广播回传的UPF。
  20. 一种传输数据的方法，其特征在于，包括：
    广播会话管理网元接收来自会话管理功能SMF的第二请求消息，所述第二请求消息用于获取执行UPF本地广播回传的UPF的信息；
    所述广播会话管理网元向所述SMF发送所述第二请求消息的响应消息，所述第二请求消息的响应消息包括执行UPF本地广播回传的UPF的信息。
  21. 根据权利要求20所述的方法，其特征在于，所述第二请求消息包括单播流信息，所述单播流信息用于标识所述单播流数据。
  22. 根据权利要求21所述的方法，其特征在于，所述第二请求消息还包括广播流信息、通信区域信息和本地广播回传指示信息中的至少一个，
    其中，所述广播流信息用于指示UPF本地广播回传的传输路径，所述通信区域信息用于指示UPF本地广播回传的通信区域，所述本地广播回传指示信息用于指示对所述单 播流数据执行UPF本地广播回传。
  23. 一种传输数据的装置，其特征在于，包括通信单元和处理单元，所述处理单元用于控制所述通信单元执行：
    向会话管理功能SMF发送第一请求消息，所述第一请求消息用于请求对单播流数据执行用户面功能UPF本地广播回传；
    接收所述第一请求消息的响应消息。
  24. 根据权利要求23所述的装置，其特征在于，所述响应消息用于指示所述第一请求消息已被接受。
  25. 根据权利要求23或24所述的装置，其特征在于，所述第一请求消息包括：单播流信息，所述单播流信息用于标识所述单播流数据。
  26. 根据权利要求25所述的装置，其特征在于，所述第一请求消息还包括广播流信息、通信区域信息和本地广播回传指示信息中的至少一个；
    其中，所述广播流信息用于指示UPF本地广播回传的传输路径，所述通信区域信息用于指示UPF本地广播回传的通信区域，所述本地广播回传指示信息用于指示对所述单播流数据执行UPF本地广播回传。
  27. 根据权利要求25或26所述的装置，其特征在于，所述第一请求消息还包括广播会话管理网元的标识。
  28. 一种传输数据的装置，其特征在于，包括处理单元和通信单元，所述处理单元用于控制所述通信单元执行：
    接收来自终端的第一请求消息，所述第一请求消息用于请求对单播流数据执行用户面功能UPF本地广播回传；
    向终端发送所述第一请求消息的响应消息。
  29. 根据权利要求28所述的装置，其特征在于，所述响应消息用于指示所述第一请求消息已被接受。
  30. 根据权利要求28或29所述的装置，其特征在于，所述第一请求消息包括：单播流信息，所述单播流信息用于标识所述单播流数据。
  31. 根据权利要求30所述的装置，其特征在于，所述第一请求消息还包括广播流信息、通信区域信息和本地广播回传指示信息中的至少一个；
    其中，所述广播流信息用于指示UPF本地广播回传的传输路径，所述通信区域信息用于指示UPF本地广播回传的通信区域，所述本地广播回传指示信息用于指示对所述单播流数据执行UPF本地广播回传。
  32. 根据权利要求30或31所述的装置，其特征在于，所述第一请求消息还包括广播会话管理网元的标识。
  33. 根据权利要求30至32中任一项所述的装置，其特征在于，
    所述处理单元还用于：
    确定广播会话管理网元；
    所述通信单元还用于：
    根据所述第一请求消息向所述广播会话管理网元发送第二请求消息，所述第二请求消息用于获取执行UPF本地广播回传的UPF的信息；
    接收所述第二请求消息的响应消息，所述第二请求消息的响应消息包括执行UPF本地广播回传的UPF的信息。
  34. 根据权利要求33所述的装置，其特征在于，所述处理单元具体还用于：
    当所述第一请求消息包括所述广播会话管理网元的标识时，根据所述广播会话管理网元的标识确定所述广播会话管理网元；或者，
    当所述第一请求消息不包括所述广播会话管理网元的标识时，根据预设规则确定所述广播会话管理网元。
  35. 根据权利要求33或34所述的装置，其特征在于，所述第二请求消息包括所述单播流信息。
  36. 根据权利要求35所述的装置，其特征在于，所述第二请求消息还包括广播流信息、通信区域信息和本地广播回传指示信息中的至少一个；
    其中，所述广播流信息用于指示UPF本地广播回传的传输路径，所述通信区域信息用于指示UPF本地广播回传的通信区域，所述本地广播回传指示信息用于指示对所述单播流数据执行UPF本地广播回传。
  37. 根据权利要求33至36中任一项所述的装置，其特征在于，所述通信单元还用于：
    向第一UPF发送第三请求消息，所述第三请求消息用于请求对所述单播流数据执行UPF本地广播回传；
    接收来自所述第一UPF的所述第三请求消息的响应消息。
  38. 根据权利要求37所述的装置，其特征在于，所述第三请求消息包括执行UPF本地广播回传的UPF的信息和所述单播流信息。
  39. 一种传输数据的装置，其特征在于，包括处理单元和通信单元，所述处理单元用于控制所述通信单元执行：
    接收来自会话管理功能SMF的第三请求消息，所述第三请求消息用于请求对单播流数据执行UPF本地广播回传；
    向所述SMF发送所述第三请求消息的响应消息。
  40. 根据权利要求39所述的装置，其特征在于，所述第三请求消息包括执行UPF本地广播回传的UPF的信息和单播流信息，所述单播流信息用于标识所述单播流数据。
  41. 根据权利要求40所述的装置，其特征在于，所述通信单元还用于：
    接收所述单播流数据；
    根据所述执行UPF本地广播回传的UPF的信息向第二UPF发送所述单播流数据，所述第二UPF为执行UPF本地广播回传的UPF。
  42. 一种传输数据的装置，其特征在于，包括处理单元和通信单元，所述处理单元用于控制所述通信单元执行：
    接收来自会话管理功能SMF的第二请求消息，所述第二请求消息用于获取执行UPF本地广播回传的UPF的信息；
    向所述SMF发送所述第二请求消息的响应消息，所述第二请求消息的响应消息包括执行UPF本地广播回传的UPF的信息。
  43. 根据权利要求42所述的装置，其特征在于，所述第二请求消息包括单播流信息，所述单播流信息用于标识所述单播流数据。
  44. 根据权利要求43所述的装置，其特征在于，所述第二请求消息还包括广播流信息、通信区域信息和本地广播回传指示信息中的至少一个，
    其中，所述广播流信息用于指示UPF本地广播回传的传输路径，所述通信区域信息用于指示UPF本地广播回传的通信区域，所述本地广播回传指示信息用于指示对所述单播流数据执行UPF本地广播回传。
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