WO2020001426A1 - 通信方法和通信装置 - Google Patents

通信方法和通信装置 Download PDF

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Publication number
WO2020001426A1
WO2020001426A1 PCT/CN2019/092754 CN2019092754W WO2020001426A1 WO 2020001426 A1 WO2020001426 A1 WO 2020001426A1 CN 2019092754 W CN2019092754 W CN 2019092754W WO 2020001426 A1 WO2020001426 A1 WO 2020001426A1
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WO
WIPO (PCT)
Prior art keywords
access network
network device
information
source access
network element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2019/092754
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English (en)
French (fr)
Inventor
余芳
李岩
倪慧
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to EP19826113.3A priority Critical patent/EP3799472B1/en
Priority to CA3104025A priority patent/CA3104025C/en
Publication of WO2020001426A1 publication Critical patent/WO2020001426A1/zh
Priority to US17/133,031 priority patent/US11570665B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
    • H04W36/026—Multicasting of data during hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0064—Transmission or use of information for re-establishing the radio link of control information between different access points
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface

Definitions

  • the present application relates to the field of communication, and more particularly, to a communication method and a communication device.
  • a radio access network (RAN) device serving a terminal device (UE) and the UE when the communication quality between a radio access network (RAN) device serving a terminal device (UE) and the UE is poor, the UE needs to be Switch to another RAN device.
  • the RAN device before the handover may be referred to as a source-RAN (S-RAN) device, and the RAN device after the handover may be referred to as a target-RAN (T-RAN) device.
  • S-RAN source-RAN
  • T-RAN target-RAN
  • Communications network based on the required delay for the downlink data packet, such as the fifth generation (the 5 th generation, 5G) low latency communication system according to a high reliability connection (ultra-reliable and low latency communications , URLLC) scenario required to reduce Delay of downlink data packets during RAN device handover.
  • 5G the 5 th generation
  • URLLC ultra-reliable and low latency communications
  • a method currently proposed to reduce the delay of downlink data packets during a handover of a RAN device includes: establishing a T-RAN device and a user plane function (UPF) network in advance before performing a handover of the RAN device The path between the elements, and the UPF network element dual-casts downlink data to the S-RAN device and the T-RAN device at the same time.
  • the S-RAN device does not need to forward the downlink data packet of the UE to the T-RAN device, thereby reducing the transmission delay of the downlink data packet.
  • the S-RAN device when the S-RAN device triggers the UE air interface handover, the downlink message before the UPF network element starts dual-casting is not sent to the UE, resulting in packet loss.
  • This application provides a communication method and a communication device, which are helpful to avoid packet loss during S-RAN equipment triggering UE air interface handover process, or to realize PDCP SN synchronization between S-RAN and T-RAN.
  • this application provides a communication method.
  • the communication method includes: during a process in which an access network device of a service terminal switches from a source access network device to a target access network device, a user plane function network element determines a The source access network device and the target access network device dual-cast the downlink message; the user plane function network element sends the first information to the source access network device, and the first information is used to instruct the user plane function network element to the source access network device. Dualcast the downlink message with the target access network device.
  • the user plane function network element when it determines to dual-cast a downlink message to the source access network device and the target access network device, it sends first information to the source access network device to instruct the user plane function network element to access the source.
  • Network equipment and target access network equipment dual-broadcast downlink messages, so that the source access network equipment can trigger the UE air interface switch after sending the downlink message received before the first message to the UE, avoiding the S- The RAN device no longer forwards the packet loss caused by the UE's downlink data packet to the T-RAN device.
  • the user plane function network element determines to dual-cast the downlink message to the source access network device and the target access network device, it sends the first information to the source access network device to instruct the user plane function network element to the source access network device and
  • the target access network device dual-broadcasts the downlink message, and it may also be convenient for the source access network device to indicate the PDCP SN of the downlink message to the target access network device according to the first information, so as to achieve the S-RAN and T-RAN PDCP SN synchronization.
  • the user plane function network element sending the first information to the source access network device includes:
  • the user plane function network element dual-broadcasts a downlink message to the source access network device and the target access network device, where the downlink message that the user plane function network element doubles to the source access network device includes first information.
  • the first information is carried in the downlink message of the dual-cast, which helps to reduce the user plane function network element and the source access network equipment compared with the first information in the new message or message.
  • the complexity of inter-communication and it will not increase the additional packets exchanged between the user plane function network element and the source access device, which will help reduce the packet transmission delay.
  • the first N downlink packets that are dual-broadcasted by the user plane function network element to the source access network device carry the first information, where N is a positive integer .
  • this implementation can improve the reliability of the source access network device receiving the first information.
  • the communication method further includes:
  • the user plane function network element After sending the first information, the user plane function network element dualcasts the downlink message to the source access network device and the target access network device.
  • the present application provides a communication method.
  • the communication method includes:
  • the source access network device receives first information from a user plane function network element, and the first information is used to instruct the user plane function network element to dually transmit the source access network device and the target access network device. Broadcast downlink messages;
  • the source access network device sends second information to the target access network device, and the second information is used for determining a packet data aggregation protocol sequence number of downlink data in the downlink message.
  • the source access network device indicates the second information of the PDCP SN of the downlink message to the target access network device according to the first information, so that the PDCP SN synchronization between the S-RAN and the T-RAN can be achieved.
  • the communication method further includes:
  • the source access network device After sending the data packet received before the first information to the terminal, the source access network device triggers an air interface switch.
  • triggering the air interface switch by the source access network device includes:
  • the source access network device sends a handover command message to the terminal;
  • the source access network device stops sending downlink data to the terminal.
  • the source access network device receives the first information from the user plane function network element, including:
  • the source access network device receives the downlink message that the user plane function network element dual-broadcasts to the source access network device and the target access network device.
  • the downlink message that the user plane function network element dual-broadcasts to the source access network device includes the first ⁇ ⁇ One message.
  • the first N downlink packets that are dual-broadcasted by the user plane function network element to the source access network device carry the first information, where N is a positive integer .
  • the communication method further includes:
  • the source access network device After receiving the first information, the source access network device receives a downlink message that the user plane function network element dual-broadcasts to the source access network device and the target access network device.
  • the communication method further includes:
  • the source access network device After the source access network device receives the handover command from the access and mobility management function network element, or after sending the handover request message to the access and mobility management function network element, it starts to detect whether the first information is received.
  • the present application provides a communication method.
  • the communication method includes:
  • the source access network device receives first information from the user plane function network element, and the first information is used to instruct the user plane function network element to dual-cast a downlink message to the source access network device and the target access network device;
  • the source access network device After sending the data packet received before the first information to the terminal, the source access network device triggers an air interface switch.
  • the source access network device receives, from the user plane function, the first information instructing the user plane function network element to dual-broadcast the downlink message to the source access network device and the target access network device, so that the first information can be based on the first information.
  • Sending the downlink message received before the first message to the UE triggers the UE air interface switch, which can ensure that before the terminal device switches to the target access network device, the source access network device has sent the message before the start of the dual-cast to The terminal device avoids packet loss caused by the S-RAN device no longer forwarding the UE's downlink data packets to the T-RAN device during the handover process.
  • triggering an air interface switch by a source access network device includes:
  • the source access network device sends a handover command message to the terminal;
  • the source access network device stops sending downlink data to the terminal.
  • the source access network device receives the first information from the user plane function network element, including:
  • the source access network device receives the downlink message that the user plane function network element dual-broadcasts to the source access network device and the target access network device.
  • the downlink message that the user plane function network element dual-broadcasts to the source access network device includes First information.
  • the first information is carried in the downlink message of the dual-cast, which does not increase an additional message exchanged between the user plane function network element and the source access device, which helps reduce the transmission delay of the message.
  • the first N downlink packets that are dual-broadcasted by the user plane function network element to the source access network device carry the first information, where N is a positive integer .
  • this implementation can improve the reliability of the source access network device receiving the first information.
  • the communication method further includes:
  • the source access network device After receiving the first information, the source access network device receives a downlink message that the user plane function network element dual-broadcasts to the source access network device and the target access network device.
  • the communication method further includes:
  • the source access network device After the source access network device receives the first information from the user plane functional network element, it sends the second information to the target access network device, and the second information is used to determine the packet data aggregation protocol sequence number of the downlink data in the downlink message.
  • the communication method further includes:
  • the source access network device After the source access network device receives the handover command from the access and mobility management function network element, or after sending the handover request message to the access and mobility management function network element, it starts to detect whether the first information is received.
  • the present application provides a communication method.
  • the communication method includes:
  • the target access network device receives, from the user plane functional network element, a downlink packet that the user plane functional network element dual-broadcasts to the source access network device and the target access network device;
  • the target access network device receives second information from the source access network device, and the second information is used for determining a packet data aggregation protocol sequence number of downlink data in the downlink message;
  • the target access network device generates a packet data convergence protocol message according to the second information and the downlink message.
  • the target access network device may receive the PDCP SN from the source access network device, and generate a PDCP message according to the PDCP SN.
  • the communication method further includes: before receiving the second information, the target access network device buffers a downlink packet.
  • a communication device includes a module for executing the communication method in the first aspect or any one of the possible implementation manners of the first aspect.
  • a communication device includes a module for executing the communication method in the second aspect or any one of the possible implementation manners of the second aspect.
  • a communication apparatus includes a module for executing the communication method in the third aspect or any one of the possible implementation manners of the third aspect.
  • a communication device includes a module for executing the communication method in the fourth aspect or any one of the possible implementation manners of the fourth aspect.
  • a communication device includes a processor and a transmitter.
  • the processor is configured to execute a program.
  • the processor and the transmitter implement the first aspect or any one of the first aspect. Communication method in one possible implementation.
  • the communication device may further include a memory.
  • the memory is used to store programs executed by the processor.
  • the communication device may further include a receiver.
  • the receiver is used to receive information from other equipment or devices.
  • An example of the communication device is a user plane function network element.
  • a communication device includes a processor, a transmitter, and a receiver.
  • the processor is configured to execute a program.
  • the processor executes the program, the processor, the transmitter, and the receiver implement the second aspect or The communication method in any one of the possible implementation manners of the second aspect.
  • the communication device may further include a memory.
  • the memory is used to store programs executed by the processor.
  • An example of the communication device is an access network device.
  • a communication device includes a processor and a receiver.
  • the processor is configured to execute a program.
  • the processor and the receiver implement the third aspect or any of the third aspects. Communication method in one possible implementation.
  • the communication device may further include a memory.
  • the memory is used to store programs executed by the processor.
  • the communication device may further include a transmitter.
  • the transmitter is used to send information to other equipment or devices.
  • An example of the communication device is an access network device.
  • a communication device includes a processor and a receiver.
  • the processor is configured to execute a program.
  • the processor and the receiver implement any of the fourth aspect or the fourth aspect. Communication method in one possible implementation.
  • the communication device may further include a memory.
  • the memory is used to store programs executed by the processor.
  • the communication device may further include a transmitter.
  • the transmitter is used to send information to other equipment or devices.
  • An example of the communication device is an access network device.
  • a computer-readable storage medium stores program code for execution by a communication device or a communication device, and the program code includes a program for implementing the first aspect or any one of the first aspect. Instructions for the communication method in one possible implementation.
  • a computer-readable storage medium stores program code for execution by a communication device or a communication device, and the program code includes a program for implementing the second aspect or any one of the second aspect. Instructions for the communication method in one possible implementation.
  • a computer-readable storage medium stores program code for execution by a communication device or a communication device, and the program code includes a program for implementing the third aspect or any one of the third aspect. Instructions for the communication method in one possible implementation.
  • a computer-readable storage medium stores program code for execution by a communication device or a communication device, and the program code includes a program for implementing the fourth aspect or any one of the fourth aspect. Instructions for the communication method in one possible implementation.
  • a chip includes a processor and a communication interface.
  • the communication interface is used to travel with an external device.
  • the processor is used to implement the first aspect or any possible implementation manner of the first aspect. Communication method in.
  • the chip may further include a memory, and the memory stores instructions.
  • the processor is configured to execute the instructions stored in the memory.
  • the processor is configured to implement the first aspect or any one of the first aspect. Communication methods in possible implementations.
  • the chip may be integrated on a user plane function network element.
  • a chip is provided.
  • the chip includes a processor and a communication interface.
  • the communication interface is used to travel with an external device.
  • the processor is used to implement the second aspect or any possible implementation manner of the second aspect. Communication method in.
  • the chip may further include a memory, and the memory stores instructions.
  • the processor is configured to execute the instructions stored in the memory.
  • the processor is configured to implement the second aspect or any one of the second aspect. Communication methods in possible implementations.
  • the chip may be integrated on an access network device.
  • a chip in a nineteenth aspect, includes a processor and a communication interface.
  • the communication interface is used to travel with an external device.
  • the processor is used to implement the third aspect or any possible implementation manner of the third aspect. Communication method in.
  • the chip may further include a memory, and the memory stores instructions.
  • the processor is configured to execute the instructions stored in the memory.
  • the processor is configured to implement the third aspect or any one of the third aspect. Communication methods in possible implementations.
  • the chip may be integrated on an access network device.
  • a chip in a twentieth aspect, includes a processor and a communication interface.
  • the communication interface is used to travel with external devices.
  • the processor is used to implement the fourth aspect or any possible implementation manner of the fourth aspect. Communication method in.
  • the chip may further include a memory, and the memory stores instructions.
  • the processor is configured to execute the instructions stored in the memory.
  • the processor is configured to implement the third aspect or any one of the third aspect. Communication methods in possible implementations.
  • the chip may be integrated on an access network device.
  • FIG. 1 is a schematic diagram of an application scenario in which the method for indicating service offloading according to an embodiment of the present application can be applied;
  • FIG. 1 is a schematic diagram of an application scenario in which the method for indicating service offloading according to an embodiment of the present application can be applied;
  • FIG. 2 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • FIG. 3 is a schematic flowchart of a communication method according to another embodiment of the present application.
  • FIG. 4 is a schematic flowchart of a communication method according to another embodiment of the present application.
  • FIG. 5 is a schematic flowchart of a communication method according to another embodiment of the present application.
  • FIG. 6 is a schematic flowchart of a communication method according to another embodiment of the present application.
  • FIG. 7 is a schematic flowchart of a communication method according to another embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of a communication device according to an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a communication device according to another embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of a communication device according to another embodiment of the present application.
  • FIG. 11 is a schematic structural diagram of a communication device according to another embodiment of the present application.
  • FIG. 12 is a schematic structural diagram of a communication device according to another embodiment of the present application.
  • an application scenario in which the method for indicating service offloading according to the embodiment of the present application can be applied may include UE 101, RAN device 102, RAN device 103, UPF network element 104, access and mobility management functions (access and A mobility management function (AMF) network element 105 and a session management function (session management function (SMF) network element 106).
  • AMF access and A mobility management function
  • SMF session management function
  • the UE may also be called a terminal device.
  • the terminal device can communicate with one or more core networks (CNs) via the RAN device.
  • the terminal device may be referred to as an access terminal, a 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 network device, a user agent, or a user device.
  • Terminals can be cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital processing (personal digital assistant, PDA), handheld with wireless communication capabilities Devices, computing devices or other devices connected to wireless modems, in-vehicle devices, wearable devices or the Internet of Things, terminal devices in vehicle networks, and any form of terminal devices in future networks.
  • SIP session initiation protocol
  • WLL wireless local loop
  • PDA personal digital assistant
  • Devices computing devices or other devices connected to wireless modems
  • in-vehicle devices wearable devices or the Internet of Things
  • terminal devices in vehicle networks and any form of terminal devices in future networks.
  • a base station also known as a base station device, is a device that connects a terminal to a wireless network, including but not limited to: transmission reception point (TRP), 5G Node B (gNB), and evolved Node B ( evolved node ( evolved node (eNB), radio network controller (RNC), node B (NB), base station controller (BSC), base transceiver station (BTS), Home base station (for example, home nodeB, or home nodeB, HNB), baseband unit (BBU), Wifi access point (AP), or small base station equipment (pico).
  • TRP transmission reception point
  • gNB 5G Node B
  • eNB evolved Node B
  • RNC radio network controller
  • NB node B
  • BSC base station controller
  • BTS base transceiver station
  • Home base station for example, home nodeB, or home nodeB, HNB
  • BBU baseband unit
  • Wifi access point AP
  • pico small base station equipment
  • base stations are not limited herein. In systems with different wireless access technologies, the names of base station-capable devices may vary. For ease of description, in all embodiments of the present application, the above-mentioned devices that provide wireless communication functions for terminals are collectively referred to as base stations.
  • UPF network elements have the functions of packet forwarding, encapsulation, and statistics of terminal equipment.
  • the AMF network element is responsible for the access and mobility management of the terminal equipment. For example, it is responsible for UE location update, UE registration network, or UE handover.
  • the SMF network element is responsible for the selection and reselection of UPF network elements, the allocation of Internet protocol (IP) addresses, etc., and may also be responsible for the establishment, modification, and release of sessions.
  • IP Internet protocol
  • the embodiments of the present application are not limited to the system architecture shown in FIG. 1.
  • the communication system to which the communication method of the embodiment of the present application can be applied may include more or fewer network elements or devices.
  • the device or network element in FIG. 1 may be hardware, software divided by functions, or a combination of the two.
  • the devices or network elements in FIG. 1 can communicate with each other through other devices or network elements.
  • the UE 101 currently communicates with the UPF network element 104 through the RAN device 102, that is, transmits uplink and downlink data packets.
  • the UE 101 needs to be switched from the RAN device 102 to the RAN device 103.
  • the RAN device 102 may determine to switch the UE 101 to the RAN device 103 according to the measurement report reported by the UE 101, that is, the UE 101 will communicate with the UPF network element 104 or other UPF network elements through the RAN device 103.
  • the RAN device 102 may be referred to as an S-RAN device, that is, a source access network device; and the RAN device 103 may be referred to as a T-RAN device, that is, a target access network device.
  • the RAN device 102 can complete interaction with the RAN device 103 so that the RAN device 103 confirms that the packet data unit (PDU) session and the PDU session that are allowed to be switched include Quality of service (QoS) flow.
  • PDU packet data unit
  • QoS Quality of service
  • the RAN device 102 provides the information of the RAN device 103 to the AMF network element 105.
  • the information of the RAN device 103 may include an identity (ID) of the RAN device 103 and N3 tunnel information (tunnel Info).
  • ID an identity
  • N3 tunnel information tunnel information
  • the N3 tunnel information is used to establish a data transmission tunnel between the UPF network element and the RAN device 103. After the UPF obtains the N3 tunnel information of the RAN device 103, it can send a downlink packet to the RAN device 103 based on the tunnel information.
  • the AMF network element 105 provides the information of the RAN device 103 to the SMF network element 106, and then the SMF network element 106 sends the instruction information or the forwarding rule to the UPF network element 104 (it can also be other UPF network elements) according to the information of the RAN device 103
  • the instruction information or the forwarding rule is used to instruct the UPF network element 104 to process and forward uplink and / or downlink data packets.
  • the SMF network element may instruct the UPF network element 104 in the instruction information or the forwarding rule to start dualcasting the downlink message to the RAN device 102 and the RAN device 103 after receiving the instruction information or the forwarding rule.
  • the AMF network element 105 not only provides the information of the RAN device 103 to the SMF network element 106, but also sends a handover command to the RAN device 102 to trigger the RAN device to perform air interface handover.
  • FIG. 2 A schematic flowchart of a communication method according to an embodiment of the present application is shown in FIG. 2.
  • the method shown in FIG. 2 may include S201, S202, and S203.
  • steps or operations of the method are shown in FIG. 2, but these steps or operations are merely examples, and the embodiment of the present application may also perform other operations or a modification of each operation in FIG. 2.
  • each step in FIG. 2 may be performed in a different order than that presented in FIG. 2, and it may not be necessary to perform all operations in FIG. 2.
  • the user plane function network element determines to dualcast the downlink message to the source access network device and the target access network device.
  • the session management function network element sends instruction information or forwarding rules to the user plane function network element. After receiving the instruction information or the forwarding rule, the user plane function network element may determine that it needs to connect to the source access network device and the target. The network access device dualcasts the downlink packets.
  • the user plane function network element dualcasts the downlink message to the source access network device and the target access network device can be understood as: the user plane function network element sends a slave to the source access network device and the target access network device at the same time.
  • DN data network
  • the user plane function network element encapsulates the downlink packet received from the DN and sends it to the source access network device and the target access network device.
  • the user plane function network element generates a first downlink message and a second downlink message according to the downlink packet, sends the first downlink message to the source access network device, and sends the first downlink message to the target access network device. Second downlink message.
  • the user plane function network element can add different general packet radio service (GPRS) tunneling protocol (tunnelling protocol for the user plane) headers to the downlink packets received from the DN to generate the first A downlink message and a second downlink message are sent to the source access network device and the target access network device, respectively.
  • GPRS general packet radio service
  • the user plane function network element may be a UPF network element 104
  • the terminal may be a UE 101
  • the source access network device may be a RAN device 102
  • the target access network device may be a RAN device 103.
  • the user plane function network element sends the first information to the source access network device, and the first information is used to instruct the user plane function network element to dualcast the downlink message to the source access network device and the target access network device.
  • the user plane function network element after determining that the user plane function network element can dual-cast the downlink message to the source access network device and the target access network device, it can send the source access network device to indicate that the user plane function network element sends the source access network device to the source access network device.
  • the first information of the downlink message is dual-cast with the target access network device.
  • the user plane function network element when the user plane function network element sends the first information to the source access network device of the terminal, the user plane function network element may have started to dualcast the downlink message to the source access network device and the target access network device.
  • the source access network device and the target access network device receive the downlink message from the user plane function network element.
  • the user plane function network element may only carry the first information in a downlink message (for example, the first downlink message described above) sent to the source access network device, or may The downlink messages (for example, the first and second downlink messages described above) sent by the network access device and the target access network device both carry the first information.
  • a downlink message for example, the first downlink message described above
  • the downlink messages for example, the first and second downlink messages described above
  • the first information may be carried in a first downlink message that the user plane function network element dual-broadcasts to the source access network device.
  • the user plane function network element may carry the first information in the first N downlink messages sent to the source access network device in a dual broadcast.
  • the user plane function network element may set an identification bit in the GTP-U header of the message to indicate the first information.
  • an identification bit may be set in the GTP-U header of the second downlink message described in step S201 to indicate the first information.
  • the specific identification bit of the GTP-U header can be set to "0" or "1" to instruct the user plane function network element to dual-broadcast downstream packets to the source access network device and the target access network device, where " 0 "or” 1 "is the first information.
  • the user plane function network element may send the first information to the source access network device of the terminal immediately before starting to dualcast the downlink message to the source access network device and the target access network device. That is, after sending the first information, the user plane function network element starts to dualcast the downlink message to the source access network device and the target access network device.
  • the source access network device and the target access network device receive the downlink message from the user plane function network element.
  • the user plane function network element may send one or more first downlink messages carrying the first information to the source access network device before dual-casting the first downlink message to indicate that the dual-cast is about to start, and then The message sent is a dualcast message.
  • the source access network device After sending the data packet received before the first information to the terminal, the source access network device triggers an air interface switch.
  • the air interface switching may refer to a Uu interface switching.
  • the triggering of the air interface switch by the source access network device may include: the source access network device sends a switch command message to the terminal, instructing the terminal device to start performing the handover; and / or, the source access network device stops sending downlink data to the terminal.
  • the user plane function network element sends the first information to the source access network device of the terminal to indicate the start of the dual-cast.
  • the source access network device receives the first information from the user plane functional network element, and after sending the data packet received before the first information to the terminal, the air interface switch is triggered, thereby ensuring that the terminal device switches to the target interface.
  • the source access network device has sent the packets before the start of the dual-cast to the terminal device to avoid packet loss during the handover process.
  • FIG. 3 A schematic flowchart of a communication method according to another embodiment of the present application is shown in FIG. 3.
  • the method shown in FIG. 3 may include S301, S302, S303, and S304.
  • FIG. 3 shows the steps or operations of the method, but these steps or operations are merely examples, and the embodiments of the present application may also perform other operations or a modification of each operation in FIG. 3.
  • each step in FIG. 3 may be performed in a different order than that presented in FIG. 3, and it may not be necessary to perform all operations in FIG. 3.
  • the user plane function network element determines to dualcast the downlink message to the source access network device and the target access network device.
  • the user plane function network element sends the first information to the source access network device, and the first information is used to instruct the user plane function network element to dualcast the downlink message to the source access network device and the target access network device.
  • steps S301 and S302 reference may be made to the description of S201 and S202 in FIG. 2, respectively, and details are not described herein again.
  • the source access network device sends second information to the target access network device, where the second information is used in a downlink message that the user plane function network element sends to the source access network device and the target access network device. Determination of PDCP and SN of downlink data. Accordingly, the target access network device receives the second information from the source access network device.
  • the second information is used by the target access network device to determine the PDCP SN of the downlink data in the downlink message that the user plane function network element dualcasts.
  • the source access network device may send the second information to the target access network device, so that the target access network device determines to receive the second information from the user plane function network element according to the second information.
  • the downlink message is a downlink message that the user plane function network element dual-broadcasts to the source access network device and the target access network device.
  • the second information may be carried in a sequence number status transfer (SN status transfer) message sent by the source access network device to the target access network device; in some possible implementations, the second information may be Including the PDCP SN assigned by the source access network device to the first dual-cast message; in some possible implementations, the second information may include the information of the source access network device assigned to a message before the first dual-cast message. PDCP SN.
  • SN status transfer sequence number status transfer
  • the target access network device generates a PDCP message according to the second information received from the source access network device and the downlink message received from the user plane function network element.
  • the downlink message includes a downlink message that the user plane function network element dual-broadcasts to the source access network device and the target access network device.
  • the target access network device may assign the PDCP SN to the first dualcast received from the user plane function network element.
  • Downlink message when the second information includes the PDCP SN allocated by the source access network device to a message before the first dual-cast message, the target access network device may add the PDCP SN to 1 and receive the PDCP SN from the user plane function network element. The first dualcast downlink message.
  • the user plane function network element sends the first information to the source access network device of the terminal to indicate the start of the dual-cast, so that the source access network device can synchronize the downlink PDCP sequence number to the target access network device.
  • the target access network device can send a PDCP message encapsulated according to the sequence number to the terminal, so that the terminal can sort and deduplicate the received message according to the sequence number in the received PDCP message.
  • the communication method shown in FIG. 3 may further include S203 in FIG. 2.
  • the communication method shown in FIG. 2 optionally, it may further include S303 and / or S304 in FIG. 3.
  • the source access network device may start detecting the first message after receiving a handover command (Handover command) sent by the access and mobility management function network element.
  • the handover command is used to indicate that the core network side of the source access network device has completed user plane establishment and update; or, after the handover request (Handover Required) message is sent to the access and mobility management function network element, Start detecting the first message.
  • the handover request message is used to request the core network side to start establishing and updating a user plane. Detecting the first information means that the source access network device detects whether the downlink packet received from the user plane function network element includes the first information.
  • the access and mobility management function network element may be an AMF network element 105.
  • the access and mobility management network element is an AMF network element
  • the session management function network element is an SMF network element
  • the user plane function network element is a UFP network element
  • the source access network device is an S-RAN device
  • the target access network is The device is a T-RAN device.
  • the S-RAN device and the T-RAN device exchange signaling messages through the Xn interface, which may refer to the S-RAN device and the T-RAN device directly exchange signaling messages through the Xn interface between them.
  • FIG. 4 shows the steps or operations of the method, but these steps or operations are merely examples, and the embodiments of the present application may also perform other operations or a modification of each operation in FIG. 4.
  • each step in FIG. 4 may be performed in a different order than that presented in FIG. 4, and it is possible that not all operations in FIG. 4 are to be performed.
  • the S-RAN device After the S-RAN device determines that the terminal device meets the handover condition according to the measurement report received from the terminal device, it sends a handover request (Handover Request) message to the T-RAN device.
  • a handover request Handover Request
  • the T-RAN device After receiving the handover request message, the T-RAN device performs admission control to determine the PDU session that accepts the handover and the QoS flow included in the session.
  • the T-RAN device sends a Handover Request Acknowledge message to the S-RAN device.
  • the message includes information of the T-RAN device.
  • the information of the T-RAN device in this step includes the N3 tunnel information of the T-RAN device.
  • the message may also include the PDU session identifier that accepts the handover and the QoS flow identifier included in the session.
  • the S-RAN device sends a handover request (Handover Required) message to the AMF network element, and the message includes information of the T-RAN device.
  • the information of the T-RAN device in this step includes the identity (ID) of the T-RAN device and the N3 tunnel information of the T-RAN device.
  • the message may also include the identity of the PDU session that accepted the handover and the identity of the QoS flow included in the session.
  • the AMF network element sends a PDU Session Context Update Request (Nsmf_PDU Session_UpdateSMContextRequest) message to the SMF network element.
  • the message includes the T-RAN device information obtained in step S404, the PDU session identifier that can accept the switch, and the QoS flow included in the session Logo.
  • the SMF network element determines that a dual-cast downlink message needs to be performed according to the information included in the PDU session context update request message received from the AMF network element in step 405, and sends an instruction to the UPF network element according to the information of the T-RAN device.
  • the indication information or the forwarding rule is carried in a N4 Session Modification Request (N4 Session Modification Request) message and sent to the UPF network element.
  • the AMF network element sends a handover command (Handover command) to the S-RAN, indicating that the S-RAN core network side has completed handover preparation.
  • a handover command (Handover command)
  • the UPF network element may determine to dualcast the downlink message to the S-RAN device and the T-RAN device, and dualcast the downlink message to the S-RAN device and the T-RAN device. Among them, The downlink message carries first information.
  • the UPF network element may carry the first information only in the downlink message sent to the S-RAN device, or may also carry the first information in the downlink messages sent to the S-RAN device and the T-RAN device.
  • an identification bit may be set in the GTP-U header in the downlink message to carry the first information.
  • the specific identification bit of the GTP-U header can be set to "0" or "1" to instruct the user plane function network element to dual-broadcast downstream packets to the source access network device and the target access network device, where " 0 "or” 1 "is the first information.
  • the UPF network element can carry the first information in the first few downlink dualcast messages. .
  • the T-RAN device After receiving the dual-cast downlink message, the T-RAN device can buffer the downlink message.
  • the S-RAN device After the S-RAN device detects the first information, it sends an SN Status Transfer (SN Status Transfer) message to the T-RAN device.
  • the message carries the second information, so that the T-RAN device can determine whether it can PDCP SN assigned to the first dualcast message.
  • the T-RAN device After receiving the second information from the S-RAN device, the T-RAN device encapsulates the buffered downlink message using the PDCP SN indicated by the second information to obtain a PDCP message.
  • the S-RAN device After the S-RAN device confirms that the data packet received before the first message has been sent to the UE, it triggers the UE to perform air interface handover.
  • the UE synchronizes to the T-RAN device and completes the RRC handover process, that is, the air interface connection with the S-RAN device. Disconnect and establish an air interface connection with the T-RAN device.
  • the T-RAN starts receiving uplink messages from the UE and sends downlink messages to the UE.
  • S407 and S408 steps there is no sequential relationship between S407 and S408 steps, that is, S407 and S408 can be executed simultaneously, S407 can be executed first, or S308 can be executed first; S411 is executed after both S407 and S408 are completed; S411 and S409 have no sequence relationship.
  • the T-RAN device sends an N2 path switching request (N2 Path Switch Request) to the AMF network element.
  • N2 Path Switch Request N2 Path Switch Request
  • the AMF network element After receiving the N2 path switching request from the T-RAN device, the AMF network element sends a PDU session context update request to the SMF network element, and requests the SMF network element to update the session context.
  • S414 After receiving the PDU session context update request from the AMF network element, the SMF network element sends an N4 session modification request to the UPF network element, instructing the UPF network element to stop dualcasting the downlink message, and only forwards the downlink report of the UE to the T-RAN device. Text.
  • the access and mobility management network element is an AMF network element
  • the session management function network element is an SMF network element
  • the user plane function network element is a UFP network element
  • the source access network device is an S-RAN device
  • the target access network is The device is a T-RAN device.
  • the S-RAN device and the T-RAN device exchange signaling through the Xn interface.
  • the AMF network element and the SMF network element before and after the switch are not In other words, the first information is carried in the downlink message sent before the dual-cast message as an example.
  • FIG. 5 a schematic flowchart of a communication method according to an embodiment of the present application is described.
  • the S-RAN device and the T-RAN device exchange signaling messages through the Xn interface, which may refer to the S-RAN device and the T-RAN device directly exchange signaling messages through the Xn interface between them.
  • FIG. 5 illustrates steps or operations of the method, but these steps or operations are merely examples, and other embodiments or variations of each operation in FIG. 5 may be performed in the embodiment of the present application. In addition, each step in FIG. 5 may be performed in a different order than that presented in FIG. 5, and it is possible that not all operations in FIG. 5 are to be performed.
  • the UPF network element receives the indication information or the forwarding rule, and can determine to dual-cast the downlink message to the S-RAN device and the T-RAN device.
  • the UPF network element sends one or more first-numbered packets carrying the first information to the S-RAN device.
  • a downlink message is used to indicate the start of dual-cast, and the subsequent message is a dual-cast message.
  • the first information may be carried in a first downlink message.
  • the first information may be set in a specific identification bit of the GTP-U header, such as setting the specific identification bit to "0" or "1".
  • the specific identification The first information in the bit may also be referred to as an end marker.
  • the end marker is used to indicate that the dualcast is about to start, and the subsequent sent message is a dualcast message.
  • the GTP-U header of the first downlink data packet carrying the first indication information also carries the downlink GTP- of the session associated with the transmission of the dualcast message between the S-RAN and the UPF network element. U tunnel information.
  • the UPF network element dualcasts downlink packets to the S-RAN device and the T-RAN device.
  • the T-RAN device After receiving the dual-cast downlink message, the T-RAN device can buffer the downlink message.
  • the communication method shown in FIG. 4 or FIG. 5 may also be applied to a scenario where one or two of the AMF network element and the SMF network element are changed. In this scenario, it is only necessary to replace the changed AMF network element or SMF network element in FIG. 4 or FIG. 5 with the changed AMF network element or SMF network element, respectively.
  • the access and mobility management network element is an AMF network element
  • the session management function network element is an SMF network element
  • the user plane function network element is a UFP network element
  • the source access network device is an S-RAN device
  • the target access network is The device is a T-RAN device.
  • the signaling signaling interaction between the S-RAN device and the T-RAN device through the N2 interface may mean that the message interaction between the S-RAN device and the T-RAN device is implemented by the N2 interface.
  • the S-RAN device sending a message to the T-RAN as an example, the S-RAN device sends the message to the AMF network element through the N2 interface, and the AMF network element sends the message to the T-RAN device through the N2 interface.
  • FIG. 6 shows steps or operations of the method, but these steps or operations are merely examples, and other embodiments or variations of each operation in FIG. 6 may be performed in the embodiment of the present application. In addition, each step in FIG. 6 may be performed in a different order than that presented in FIG. 6, and it is possible that not all operations in FIG. 6 are to be performed.
  • the S-RAN device After determining that the terminal device meets the handover condition according to the measurement report received from the terminal device, the S-RAN device sends a handover request (Handover Required) to the AMF network element.
  • the handover request message includes information of the T-RAN device. It includes the T-RAN device ID carried in the measurement report, and the PDU session identifier of the requested switch.
  • the AMF network element After receiving the handover request message, the AMF network element sends a PDU session context update request message to the SMF network element.
  • the message includes the information of the T-RAN device and the PDU session identifier for the handover request.
  • the SMF network element determines an acceptable PDU session according to the information included in the PDU session context update request message received from the AMF network element in step 602, and determines whether to add an intermediate UPF network element according to the UPF selection criteria.
  • this embodiment of the present application assumes that there is no need to add an intermediate UPF network element. It should be noted that the method in the embodiment of the present application is also applicable to a scenario where an intermediate UPF network element needs to be added.
  • the SMF network element sends a PDU session context update response message to the AMF network element, and the message includes the accepted PDU session identification information.
  • the AMF network element After receiving the PDU session context update response message from the SMF network element, the AMF network element sends a Handover Request message to the T-RAN device according to the T-RAN ID obtained in step 601.
  • the request message includes the AMF in step 504.
  • Information received by the network element from the SMF network element is not limited to, but not limited
  • the T-RAN device sends a Handover Request Acknowledge message to the AMF network element, and the message includes the PDU session identifier accepted by the T-RAN network element and the QoS flow identifier included in the session, and the T-RAN device is also included. N3 tunnel information.
  • the AMF network element sends a PDU session context update request message to the SMF network element.
  • the message includes the N3 tunnel information of the T-RAN device, and the PDU session identifier that the T-RAN device accepts the handover and the QoS flow identifier included in the session.
  • the SMF network element determines that a dual-cast downlink message needs to be performed according to the information included in the PDU session context update request message received from the AMF network element in step 607, and sends an instruction to the UPF network element according to the information of the T-RAN device.
  • the indication information or forwarding rule is carried in the N4 session modification request and sent to the UPF network element.
  • the AMF network element sends a handover command to the S-RAN, indicating that the S-RAN core network side has completed handover preparation.
  • the UPF network element receives the indication information or the forwarding rule, and can determine to dual-cast the downlink message to the S-RAN device and the T-RAN device, and dual-cast the downlink message to the S-RAN device and the T-RAN device.
  • the downlink message carries first information.
  • the UPF network element may carry the first information only in the downlink message sent to the S-RAN device, or may also carry the first information in the downlink messages sent to the S-RAN device and the T-RAN device.
  • an identification bit may be set in the GTP-U header in the downlink message to carry the first information.
  • the specific identification bit of the GTP-U header can be set to "0" or "1" to instruct the user plane function network element to dual-broadcast downstream packets to the source access network device and the target access network device, where " 0 "or” 1 "is the first information.
  • the UPF network element can carry the first information in the first few downlink dualcast messages. .
  • the T-RAN device After receiving the dual-cast downlink message, the T-RAN device can buffer the downlink message.
  • the S-RAN device after detecting the first information, the S-RAN device sends an SN status transmission message to the T-RAN device, which carries the second information, so that the T-RAN device can determine that it can be allocated to the first one according to the second information.
  • PDCP SN for dualcast messages.
  • the SN status transmission message is also forwarded by the AMF network element, that is, the S-RAN device sends the SN status transmission message to the AMF network.
  • the AM and F network elements are then sent to the T-RAN device.
  • the T-RAN device After receiving the second information from the S-RAN device, the T-RAN device uses the PDCP SN indicated by the second information to encapsulate the buffered downlink message to obtain a PDCP message.
  • the S-RAN device After the S-RAN device confirms that the data packet received before the first message has been sent to the UE, it triggers the UE to perform the air interface handover.
  • the UE synchronizes to the T-RAN device and completes the RRC handover process, that is, the air interface connection with the S-RAN device. Disconnect and establish an air interface connection with the T-RAN device.
  • the T-RAN starts receiving uplink messages from the UE and sends downlink messages to the UE.
  • the T-RAN device sends a handover notification message to the AMF.
  • the AMF device After receiving the handover notification message from the T-RAN device, the AMF device sends a PDU session context update request to the SMF device, requesting the SMF device to update the session context.
  • the SMF device After receiving the PDU session context update request from the AMF device, the SMF device sends an N4 session modification request to the UPF, instructing the UPF to stop dualcasting the downlink message, and only sending the UE's downlink message to the T-RAN device.
  • S609 and S610 steps there is no sequential relationship between S609 and S610 steps, that is, S609 and S610 can be executed simultaneously, S609 can be executed first, or S610 can be executed first; S613 is executed after both S610 and S611 are completed; S613 and S611 steps are not sequential Order relationship.
  • the access and mobility management network element is an AMF network element
  • the session management function network element is an SMF network element
  • the user plane function network element is a UFP network element
  • the source access network device is an S-RAN device
  • the target access network is The device is a T-RAN device.
  • the S-RAN device and the T-RAN device exchange signaling messages through the N2 interface.
  • the AMF network element and the SMF network element are not connected before and after the switch.
  • the first information is carried in the downlink message sent before the dual-cast message as an example.
  • the signaling signaling interaction between the S-RAN device and the T-RAN device through the N2 interface may mean that the message interaction between the S-RAN device and the T-RAN device is implemented by the N2 interface.
  • the S-RAN device sending a message to the T-RAN as an example, the S-RAN device sends the message to the AMF network element through the N2 interface, and the AMF network element sends the message to the T-RAN device through the N2 interface.
  • the first information may be carried in a first downlink message.
  • the first information may be set in a specific identification bit of the GTP-U header, such as setting the specific identification bit to "0" or "1".
  • the specific identification The first information in the bit may also be referred to as an end marker.
  • the end marker is used to indicate that the dualcast is about to start, and the subsequent sent message is a dualcast message.
  • the GTP-U header of the first downlink data packet carrying the first indication information also carries the downlink GTP- of the session associated with the transmission of the dualcast message between the S-RAN and the UPF network element. U tunnel information.
  • FIG. 7 shows the steps or operations of the method, but these steps or operations are merely examples, and the embodiments of the present application may also perform other operations or a modification of each operation in FIG. 7.
  • each step in FIG. 7 may be performed in a different order than that presented in FIG. 7, and it is possible that not all operations in FIG. 7 are to be performed.
  • the communication method shown in FIG. 6 or FIG. 7 may also be applied to a scenario where an AMF network element changes.
  • the source access network device in FIG. 6 or FIG. 7 needs to be replaced with the target AMF network element, that is, the changed AMF network element.
  • the message sent by the source access network device to the target AMF network element is forwarded by the source AMF network element.
  • the UPF network element may refer to an anchor point UPF (Anchor UPF), that is, a PDU Session Anchor (PSA).
  • Anchor UPF Anchor UPF
  • PSA PDU Session Anchor
  • the communication methods shown in FIG. 4 to FIG. 7 are also applicable to the case where there is an intermediate UPF (Intermediate UPF) network element between the access network device and the anchor UPF network element. At this time, the intermediate UPF network element is only in the access network device and the UPF network element. Uplink and downlink packets are sent between the anchor UPF network elements.
  • FIG. 8 is a schematic block diagram of a communication device 800 according to an embodiment of the present application. It should be understood that the communication device 800 is only an example. The communication device according to the embodiment of the present application may further include other modules or units, or include modules similar in function to each module in FIG. 8, or not all modules in FIG. 8.
  • the communication device 800 may be a user plane function network element.
  • a processing module 810 configured to determine to dual-cast to the source access network device and the target access network device during the process of switching the access network device of the service terminal from the source access network device to the target access network device Downlink message.
  • the sending module 820 is configured to send first information to the source access network device, where the first information is used to instruct the user plane function network element to dual-cast to the source access network device and the target access network device. Downlink message.
  • the sending module is specifically configured to: dual-broadcast downlink packets to the source access network device and the target access network device, and the user plane function network element dual-broadcasts the source access network device
  • the downlink message includes the first information.
  • the first N downlink messages that the communication device dualcasts to the source access network device carry the first information, where N is a positive integer.
  • the sending module is specifically configured to: after sending the first information, dual-cast a downlink message to the source access network device and the target access network device.
  • the communication device 800 may be configured to perform the steps performed by the user plane function network element in the methods described in FIG. 2 to FIG. 7. For brevity, details are not described herein again.
  • FIG. 9 is a schematic block diagram of a communication device 900 according to an embodiment of the present application. It should be understood that the communication device shown in FIG. 9 is only an example, and the communication device in the embodiment of the present application may further include other modules or units, or include modules similar in function to each module in FIG. 9, or does not include FIG. 9. All modules in.
  • the communication apparatus 900 may be an access network device.
  • the receiving module 910 is configured to receive first information from a user-plane function network element during an access network device switching of a service terminal from a source access network device to a target access network device, where the first information is used to indicate The user plane function network element dualcasts a downlink message to the source access network device and the target access network device.
  • a sending module 920 is configured to send second information to the target access network device after receiving the first information from the user plane function network element, where the second information is used for downlink data in the downlink message. Determination of the packet data convergence protocol sequence number.
  • the receiving module is specifically configured to receive a downlink message that the user plane function network element dual-broadcasts to the source access network device and the target access network device, and the user plane function network element to the source
  • the downlink message dual-cast by the access network device includes the first information.
  • the first N downlink messages that the user plane function network element dualcasts to the source access network device carry the first information, and N is a positive integer.
  • the receiving module is specifically configured to: after receiving the first information, receive a downlink report that the user plane function network element dual-casts to the source access network device and the target access network device Text.
  • the communication device 900 further includes a switching module 930, which is configured to trigger an air interface switching after sending a data packet received before the first information to the terminal.
  • a switching module 930 which is configured to trigger an air interface switching after sending a data packet received before the first information to the terminal.
  • the switching module is specifically configured to send a switching command message to the terminal; or is specifically configured to stop sending downlink data to the terminal.
  • the communication device further includes a detection module 940, configured to receive a handover command from an access and mobility management function network element, or after sending a handover request message to the access and mobility management function network element To start detecting whether the first information is received.
  • a detection module 940 configured to receive a handover command from an access and mobility management function network element, or after sending a handover request message to the access and mobility management function network element To start detecting whether the first information is received.
  • the communication device 900 may be configured to perform the steps performed by the source access network device in the methods described in FIG. 2 to FIG. 7. For brevity, details are not described herein again.
  • FIG. 10 is a schematic block diagram of a communication device 1000 according to an embodiment of the present application. It should be understood that the communication device shown in FIG. 10 is only an example. The communication device in the embodiment of the present application may further include other modules or units, or include modules similar in function to each module in FIG. All modules in.
  • the communication apparatus 1000 may be an access network device.
  • the receiving module 1010 is configured to receive first information from a user plane function network element during an access network device switching of a service terminal from a source access network device to a target access network device, where the first information is used to indicate The user plane function network element dualcasts a downlink message to the source access network device and the target access network device.
  • the switching module 1020 is configured to trigger an air interface switch after sending a data packet received before the first information to the terminal.
  • the switching module is specifically configured to send a switching command message to the terminal; or is specifically configured to stop sending downlink data to the terminal.
  • the receiving module is specifically configured to receive a downlink message that the user plane function network element dual-broadcasts to the source access network device and the target access network device, the user plane function network element
  • the downlink message dual-broadcasted to the source access network device includes the first information.
  • the first N downlink messages that the user plane function network element dualcasts to the source access network device carry the first information, and N is a positive integer.
  • the receiving module is specifically configured to: after receiving the first information, receive a downlink report that the user plane function network element dual-casts to the source access network device and the target access network device Text.
  • the communication device 1000 further includes a detection module 1030, configured to receive a handover command from an access and mobility management function network element, or send a handover request message to the access and mobility management function network element. Then, it is detected whether the first information is received.
  • a detection module 1030 configured to receive a handover command from an access and mobility management function network element, or send a handover request message to the access and mobility management function network element. Then, it is detected whether the first information is received.
  • the communication device 1000 further includes a sending module 1040, configured to send second information to the target access network device, where the second information is used for packet data aggregation of downlink data in the downlink message. Determination of the protocol serial number.
  • the communication device 1000 may be configured to perform the steps performed by the source access network device in the methods described in FIG. 2 to FIG. 7. For brevity, details are not described herein again.
  • FIG. 11 is a schematic block diagram of a communication device 1100 according to an embodiment of the present application. It should be understood that the communication device shown in FIG. 11 is merely an example, and the communication device in the embodiment of the present application may further include other modules or units, or include modules similar in function to each module in FIG. 11, or does not include FIG. 11. All modules in.
  • the communication device 1100 may be an access network device.
  • a receiving module 1110 configured to receive, from a user plane function network element, the user plane function network element to the source terminal during a process of switching an access network device of a service terminal from a source access network device to a target access network device A downlink message that is dual-cast by the network access device and the target access network device.
  • the receiving module 1110 is further configured to receive second information from the source access network device, where the second information is used to determine a packet data aggregation protocol sequence number of downlink data in the downlink message;
  • the processing module 1120 is configured to generate a packet data convergence protocol message according to the second information and the downlink message.
  • the communication device further includes a buffer module 1130, configured to buffer the downlink packet before receiving the second information.
  • a buffer module 1130 configured to buffer the downlink packet before receiving the second information.
  • the communication device 1100 may be configured to perform the steps performed by the target access network device in the methods described in FIG. 2 to FIG. 7. For brevity, details are not described herein again.
  • FIG. 12 is a schematic structural diagram of a communication device according to another embodiment of the present application. It should be understood that the communication device 1200 shown in FIG. 12 is merely an example, and the communication device in the embodiment of the present application may further include other modules or units, or include modules similar in function to each module in FIG. 12.
  • the communication device 1200 may include one or more processors 1210, one or more memories 1220, a receiver 1230, and a transmitter 1240.
  • the receiver 1230 and the transmitter 1240 may be integrated together and called a transceiver.
  • the memory 1220 is configured to store a program code executed by the processor 1210.
  • the processor 1210 may be integrated with a memory 1220, or the processor 1210 is coupled to one or more memories 1220, and is configured to retrieve instructions in the memory 1220.
  • the processor 1210 may be used to implement operations or steps that can be implemented by the processing module 810 in FIG. 8, and the transmitter 1240 may be used to implement operations or steps that can be implemented by the sending module 820 in FIG. 8.
  • the processor 1210 may be used to implement operations or steps that can be implemented by the switching module 930 and the detection module 940 in FIG. 9, and the receiver 1230 may be used to implement operations that can be implemented by the receiving module 910 in FIG. 9.
  • the transmitter 1240 may be used to implement operations or steps that can be implemented by the sending module 920 in FIG. 9.
  • the processor 1210 may be used to implement operations or steps that can be implemented by the switching module 1020 and the detection module 1030 in FIG. 10, and the receiver 1230 may be used to implement operations that can be implemented by the receiving module 1010 in FIG. Or, the transmitter 1240 may be used to implement operations or steps that can be implemented by the sending module 1040 in FIG. 10.
  • the processor 1210 may be used to implement operations or steps that can be implemented by the processing module 1120 in FIG. 11, and the receiver 1230 may be used to implement operations or steps that can be implemented by the receiving module 1110 in FIG. 11.
  • 1220 is used to store program code executed by the processor 1210 and operations or steps that can be implemented by the cache module 1130 in FIG. 11.
  • the disclosed systems, devices, and methods may be implemented in other ways.
  • the device embodiments described above are only schematic.
  • the division of the unit is only a logical function division.
  • multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, which may be electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objective of the solution of this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each of the units may exist separately physically, or two or more units may be integrated into one unit.
  • the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium.
  • the technical solution of the present application is essentially a part that contributes to the existing technology or a part of the technical solution can be embodied in the form of a software product.
  • the computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in the embodiments of the present application.
  • the aforementioned storage media include: U disks, mobile hard disks, read-only memories (ROM), random access memories (RAM), magnetic disks or optical disks, and other media that can store program codes .

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Abstract

本申请提供通信方法和通信装置。该通信方法和通信装置在服务终端的接入网设备从源接入网设备切换到目标接入网设备的过程中，用户面功能网元可以向源接入网设备传输第一信息，第一信息用于指示用户面功能网元向源接入网设备和目标接入网设备双播下行报文，以便于源接入网设备在确定将第一信息之前接收的数据包发送至所述终端后，触发空口切换，避免切换过程中丢包，或以便于源接入网设备向目标接入网设备同步PDCPSN。

Description

通信方法和通信装置
本申请要求于2018年06月25日提交中国专利局、申请号为201810660940.1、申请名称为“通信方法和通信装置”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，并且更具体地，涉及通信方法和通信装置。
背景技术
在通信网络中，在一些场景下，例如当前为终端设备(user equipment，UE)服务的无线接入网(radio access network，RAN)设备与UE之间的通信质量较差时，需要将该UE切换到其他RAN设备。其中，切换前的RAN设备可以称为源无线接入网(source-RAN，S-RAN)设备，切换后的RAN设备可以称为目标无线接入网(target-RAN，T-RAN)设备。
基于通信网络对下行数据包的时延的要求，例如第五代(the 5 thgeneration，5G)通信系统的低时延高可靠连接(ultra-reliable and low latency communications，URLLC)场景，需要减小RAN设备的切换过程中下行数据包的时延。
目前提出的一种减小RAN设备的切换过程中下行数据包的时延的方法包括：在执行RAN设备的切换前，提前建立好T-RAN设备与用户面功能(user plane function，UPF)网元之间的路径，并且，UPF网元向S-RAN设备和T-RAN设备同时双播下行数据。这样，在切换执行阶段，S-RAN设备就不需要向T-RAN设备转发UE的下行数据包，从而可以减小下行数据包的传输时延。
该方法中，可能会导致S-RAN设备触发UE空口切换时，UPF网元开始双播之前的下行报文并没有发送给UE，从而造成丢包。
发明内容
本申请提供通信方法和通信装置，有助于避免S-RAN设备触发UE空口切换过程中发生丢包，或有助于实现S-RAN与T-RAN之间的PDCP SN的同步。
第一方面，本申请提供了一种通信方法，该通信方法包括：在服务终端的接入网设备从源接入网设备切换到目标接入网设备的过程中，用户面功能网元确定向源接入网设备和目标接入网设备双播下行报文；用户面功能网元向源接入网设备发送第一信息，第一信息用于指示用户面功能网元向源接入网设备和目标接入网设备双播下行报文。
该通信方法中，用户面功能网元确定向源接入网设备和目标接入网设备双播下行报文时，向源接入网设备发送第一信息指示用户面功能网元向源接入网设备和目标接入网设备双播下行报文，以便于源接入网设备可以在将第一信息之前收到的下行报文发送给UE后 触发UE空口切换，避免切换过程中由于S-RAN设备不再向T-RAN设备转发UE的下行数据包而导致的丢包。
此外，用户面功能网元确定向源接入网设备和目标接入网设备双播下行报文时，向源接入网设备发送第一信息指示用户面功能网元向源接入网设备和目标接入网设备双播下行报文，还可以以便于源接入网设备根据第一信息向目标接入网设备指示该下行报文的PDCP SN，从而实现S-RAN与T-RAN之间的PDCP SN的同步。
结合第一方面，在第一种可能的实现方式中，用户面功能网元向源接入网设备发送第一信息，包括：
用户面功能网元向源接入网设备和目标接入网设备双播下行报文，其中，用户面功能网元向源接入网设备双播的该下行报文中包括第一信息。
该实现方式中，在双播的下行报文中携带第一信息，与在新的报文或消息中携带第一信息相比，有助于降低用户面功能网元与源接入网设备之间通信的复杂度，并且不会额外增加用户面功能网元与源接入设备之间交互的报文，有助于降低报文传输时延。
结合第一种可能的实现方式，在第二种可能的实现方式中，用户面功能网元向源接入网设备双播的前N个下行报文中均携带第一信息，N为正整数。
当N大于1时，该实现方式可以提高源接入网设备接收第一信息的可靠性。
结合第一方面，在第三种可能的实现方式中，该通信方法还包括：
用户面功能网元在发送第一信息之后，向源接入网设备和目标接入网设备双播下行报文。
第二方面，本申请提供了一种通信方法，该通信方法包括：
在服务终端的接入网设备从源接入网设备切换到目标接入网设备的过程中，
所述源接入网设备从用户面功能网元接收第一信息，所述第一信息用于指示所述用户面功能网元向所述源接入网设备和所述目标接入网设备双播下行报文；
所述源接入网设备向所述目标接入网设备发送第二信息，所述第二信息用于所述下行报文中的下行数据的分组数据汇聚协议序列号的确定。
源接入网设备根据第一信息向目标接入网设备指示该下行报文的PDCP SN的第二信息，从而可以实现S-RAN与T-RAN之间的PDCP SN的同步。
结合第二方面，在第一种可能的实现方式中，所述通信方法还包括：
在将第一信息之前接收的数据包发送至终端后，源接入网设备触发空口切换。
结合第一种可能的实现方式，在第二种可能的实现方式中，源接入网设备触发空口切换包括：
源接入网设备向终端发送切换命令消息；或
源接入网设备停止向终端发送下行数据。
结合第二方面或第一种或第二种可能的实现方式，在第三种可能的实现方式中，源接入网设备从用户面功能网元接收第一信息，包括：
源接入网设备接收用户面功能网元向源接入网设备和目标接入网设备双播的下行报文，用户面功能网元向源接入网设备双播的下行报文中包括第一信息。
结合第三种可能的实现方式，在第四种可能的实现方式中，用户面功能网元向源接入网设备双播的前N个下行报文中均携带第一信息，N为正整数。
结合第二方面或第一种或第二种可能的实现方式，在第五种可能的实现方式中，所述通信方法还包括：
源接入网设备在接收第一信息之后，接收用户面功能网元向源接入网设备和目标接入网设备双播的下行报文。
结合第二方面或第一种至第五种中任意一种可能的实现方式，在第六种可能的实现方式中，所述通信方法还包括：
源接入网设备从接入和移动性管理功能网元接收切换命令后，或在向接入和移动性管理功能网元发送切换请求消息后，开始检测是否接收到第一信息。
第三方面，本申请提供一种通信方法，该通信方法包括：
在服务终端的接入网设备从源接入网设备切换到目标接入网设备的过程中，
源接入网设备从用户面功能网元接收第一信息，第一信息用于指示用户面功能网元向源接入网设备和目标接入网设备双播下行报文；
在将第一信息之前接收的数据包发送至终端后，源接入网设备触发空口切换。
该通信方法中，源接入网设备从用户面功能接收指示用户面功能网元向源接入网设备和目标接入网设备双播下行报文的第一信息，从而可以根据第一信息，将第一信息之前收到的下行报文发送给UE后触发UE空口切换，可以保证终端设备在切换到目标接入网设备前，源接入网设备已经将双播开始之前的报文发送给终端设备，避免切换过程中由于S-RAN设备不再向T-RAN设备转发UE的下行数据包而导致的丢包。
结合第三方面，在第一种可能的实现方式中，源接入网设备触发空口切换包括：
源接入网设备向终端发送切换命令消息；或
源接入网设备停止向终端发送下行数据。
结合第三方面或第一种可能的实现方式，在第二种可能的实现方式中，源接入网设备从用户面功能网元接收第一信息，包括：
源接入网设备接收用户面功能网元向源接入网设备和目标接入网设备双播的下行报文，用户面功能网元向源接入网设备双播的该下行报文中包括第一信息。
该实现方式中，在双播的下行报文中携带第一信息，不会额外增加用户面功能网元与源接入设备之间交互的报文，有助于降低报文传输时延。
结合第二种可能的实现方式，在第三种可能的实现方式中，用户面功能网元向源接入网设备双播的前N个下行报文中均携带第一信息，N为正整数。
当N大于1时，该实现方式可以提高源接入网设备接收第一信息的可靠性。
结合第三方面或第一种可能的实现方式，在第四种可能的实现方式中，该通信方法还包括：
源接入网设备在接收第一信息之后，接收用户面功能网元向源接入网设备和目标接入网设备双播的下行报文。
结合第三方面或上述任意一种可能的实现方式，在第五种可能的实现方式中，该通信方法还包括：
源接入网设备从用户面功能网元接收第一信息后，向目标接入网设备发送第二信息，第二信息用于下行报文中的下行数据的分组数据汇聚协议序列号的确定。
结合第三方面或上述任意一种可能的实现方式，在第六种可能的实现方式中，该通信 方法还包括：
源接入网设备从接入和移动性管理功能网元接收切换命令后，或在向接入和移动性管理功能网元发送切换请求消息后，开始检测是否接收到第一信息。
第四方面，本申请提供了一种通信方法，该通信方法包括：
在服务终端的接入网设备从源接入网设备切换到目标接入网设备的过程中，
目标接入网设备从用户面功能网元接收用户面功能网元向源接入网设备和目标接入网设备双播的下行报文；
目标接入网设备从源接入网设备接收第二信息，第二信息用于下行报文中的下行数据的分组数据汇聚协议序列号的确定；
目标接入网设备根据第二信息和下行报文，生成分组数据汇聚协议报文。
该通信方法中，目标接入网设备可以从源接入网设备接收PDCP SN，并根据该PDCP SN生成PDCP报文。
在一种可能的实现方式中，该通信方法还包括：在接收第二信息之前，目标接入网设备缓存下行报文。
第五方面，提供了一种通信装置，该通信装置包括用于执行第一方面或第一方面的任意一种可能的实现方式中的通信方法的模块。
第六方面，提供了一种通信装置，该通信装置包括用于执行第二方面或第二方面的任意一种可能的实现方式中的通信方法的模块。
第七方面，提供了一种通信装置，该通信装置包括用于执行第三方面或第三方面的任意一种可能的实现方式中的通信方法的模块。
第八方面，提供了一种通信装置，该通信装置包括用于执行第四方面或第四方面的任意一种可能的实现方式中的通信方法的模块。
第九方面，提供了一种通信装置，该通信装置包括处理器和发送器，处理器用于执行程序，当处理器执行程序时，处理器和发送器实现第一方面或第一方面的任意一种可能的实现方式中的通信方法。
可选地，该通信装置还可以包括存储器。存储器用于存储处理器执行的程序。
可选地，该通信装置还可以包括接收器。接收器用于从其他设备或装置接收信息。
该通信装置的一种示例为用户面功能网元。
第十方面，提供了一种通信装置，该通信装置包括处理器、发送器和接收器，处理器用于执行程序，当处理器执行程序时，处理器、发送器和接收器实现第二方面或第二方面的任意一种可能的实现方式中的通信方法。
可选地，该通信装置还可以包括存储器。存储器用于存储处理器执行的程序。
该通信装置的一种示例为接入网设备。
第十一方面，提供了一种通信装置，该通信装置包括处理器和接收器，处理器用于执行程序，当处理器执行程序时，处理器和接收器实现第三方面或第三方面的任意一种可能的实现方式中的通信方法。
可选地，该通信装置还可以包括存储器。存储器用于存储处理器执行的程序。
可选地，该通信装置还可以包括发送器。发送器用于向其他设备或装置发送信息。
该通信装置的一种示例为接入网设备。
第十二方面，提供了一种通信装置，该通信装置包括处理器和接收器，处理器用于执行程序，当处理器执行程序时，处理器和接收器实现第四方面或第四方面的任意一种可能的实现方式中的通信方法。
可选地，该通信装置还可以包括存储器。存储器用于存储处理器执行的程序。
可选地，该通信装置还可以包括发送器。发送器用于向其他设备或装置发送信息。
该通信装置的一种示例为接入网设备。
第十三方面，提供一种计算机可读存储介质，该计算机可读存储介质存储用于通信装置或通信设备执行的程序代码，该程序代码包括用于实现第一方面或第一方面的任意一种可能的实现方式中的通信方法的指令。
第十四方面，提供一种计算机可读存储介质，该计算机可读存储介质存储用于通信装置或通信设备执行的程序代码，该程序代码包括用于实现第二方面或第二方面的任意一种可能的实现方式中的通信方法的指令。
第十五方面，提供一种计算机可读存储介质，该计算机可读存储介质存储用于通信装置或通信设备执行的程序代码，该程序代码包括用于实现第三方面或第三方面的任意一种可能的实现方式中的通信方法的指令。
第十六方面，提供一种计算机可读存储介质，该计算机可读存储介质存储用于通信装置或通信设备执行的程序代码，该程序代码包括用于实现第四方面或第四方面的任意一种可能的实现方式中的通信方法的指令。
第十七方面，提供一种芯片，该芯片包括处理器和通信接口，该通信接口用于与外部器件进行同行，该处理器用于实现第一方面或第一方面的任意一种可能的实现方式中的通信方法。
可选地，该芯片还可以包括存储器，该存储器中存储有指令，处理器用于执行存储器中存储的指令，当该指令被执行时，处理器用于实现第一方面或第一方面的任意一种可能的实现方式中的通信方法。
可选地，该芯片可以集成在用户面功能网元上。
第十八方面，提供一种芯片，该芯片包括处理器和通信接口，该通信接口用于与外部器件进行同行，该处理器用于实现第二方面或第二方面的任意一种可能的实现方式中的通信方法。
可选地，该芯片还可以包括存储器，该存储器中存储有指令，处理器用于执行存储器中存储的指令，当该指令被执行时，处理器用于实现第二方面或第二方面的任意一种可能的实现方式中的通信方法。
可选地，该芯片可以集成在接入网设备上。
第十九方面，提供一种芯片，该芯片包括处理器和通信接口，该通信接口用于与外部器件进行同行，该处理器用于实现第三方面或第三方面的任意一种可能的实现方式中的通信方法。
可选地，该芯片还可以包括存储器，该存储器中存储有指令，处理器用于执行存储器中存储的指令，当该指令被执行时，处理器用于实现第三方面或第三方面的任意一种可能的实现方式中的通信方法。
可选地，该芯片可以集成在接入网设备上。
第二十方面，提供一种芯片，该芯片包括处理器和通信接口，该通信接口用于与外部器件进行同行，该处理器用于实现第四方面或第四方面的任意一种可能的实现方式中的通信方法。
可选地，该芯片还可以包括存储器，该存储器中存储有指令，处理器用于执行存储器中存储的指令，当该指令被执行时，处理器用于实现第三方面或第三方面的任意一种可能的实现方式中的通信方法。
可选地，该芯片可以集成在接入网设备上。
附图说明
图1是可以应用本申请实施例的指示业务分流的方法的应用场景的示意图；
图2是本申请一个实施例的通信方法的示意性流程图；
图3是本申请另一个实施例的通信方法的示意性流程图；
图4是本申请另一个实施例的通信方法的示意性流程图；
图5是本申请另一个实施例的通信方法的示意性流程图；
图6是本申请另一个实施例的通信方法的示意性流程图；
图7是本申请另一个实施例的通信方法的示意性流程图；
图8是本申请一个实施例的通信装置的示意性结构图；
图9是本申请另一个实施例的通信装置的示意性结构图；
图10是本申请另一个实施例的通信装置的示意性结构图；
图11是本申请另一个实施例的通信装置的示意性结构图；
图12是本申请另一个实施例的通信装置的示意性结构图。
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。
如图1所示，可以应用本申请实施例的指示业务分流的方法的应用场景中可以包括UE 101、RAN设备102、RAN设备103、UPF网元104、接入和移动性管理功能(access and mobility management function，AMF)网元105和会话管理功能(session management function，SMF)网元106。
UE也可以称为终端设备。终端设备可以经RAN设备与一个或多个核心网(core network，CN)进行通信。终端设备可称为接入终端、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、无线网络设备、用户代理或用户装置。终端可以是蜂窝电话、无绳电话、会话启动协议(session initiation protocol，SIP)电话、无线本地环路(wireless localloop，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设备、车载设备、可穿戴设备或物联网、车辆网中的终端设备以及未来网络中的任意形态的终端设备等。
RAN设备的一种示例是基站(base station，BS)。基站，也可称为基站设备，是一种将终端接入到无线网络的设备，包括但不限于：传输接收点(transmission reception point，TRP)、5G节点B(gNB)、演进型节点B(evolved node B，eNB)、无线网络控制器(radio  network controller，RNC)、节点B(node B，NB)、基站控制器(base station controller，BSC)、基站收发台(base transceiver station,BTS)、家庭基站(例如，home evolved nodeB，或home node B，HNB)、基带单元(base band unit，BBU)，或Wifi接入点(access point，AP)，或小基站设备(pico)等。
应理解，本文对基站的具体类型不作限定。采用不同无线接入技术的系统中，具备基站功能的设备的名称可能会有所不同。为方便描述，本申请所有实施例中，上述为终端提供无线通信功能的装置统称为基站。
UPF网元具有终端设备的报文转发、封装和统计等功能。
AMF网元负责终端设备的接入和移动性管理。例如，负责UE位置更新、UE注册网络或UE切换等。
SMF网元负责UPF网元的选择、重选，互联网协议(internet protocol，IP)地址的分配等，还可以负责会话的建立、修改和释放等。
应理解，本申请实施例并不限于图1所示的系统架构中。例如，可以应用本申请实施例的通信方法的通信系统中可以包括更多或更少的网元或设备。图1中的设备或网元可以是硬件，也可以是从功能上划分的软件或者以上二者的结合。图1中的设备或网元之间可以通过其他设备或网元通信。
图1所示的通信系统中，UE 101当前通过RAN设备102与UPF网元104通信，即传输上下行数据包。
在一些场景下，需要将UE 101从RAN设备102切换至RAN设备103。例如，RAN设备102可以根据UE 101上报的测量报告确定要将UE 101切换至RAN设备103，即UE101将通过RAN设备103与UPF网元104或其他UPF网元通信。其中，RAN设备102可以称为S-RAN设备，即源接入网设备；RAN设备103可以称为T-RAN设备，即目标接入网设备。
确定需要将UE 101从RAN设备102切换至RAN设备103后，RAN设备102可以与RAN设备103完成交互，以便RAN设备103确认允许切换的分组数据单元(packet data unit，PDU)会话以及PDU会话包含的服务质量(quality of service，QoS)流(flow)。
此外，RAN设备102将RAN设备103的信息提供给AMF网元105。其中，RAN设备103的信息可以包括RAN设备103的标识(identity，ID)以及N3隧道信息(tunnel Info)，N3隧道信息用于建立UPF网元与RAN设备103之间的数据传输隧道。UPF获取RAN设备103的N3隧道信息后，可以基于该隧道信息向RAN设备103发送下行报文。
AMF网元105将RAN设备103的信息提供给SMF网元106，然后SMF网元106根据RAN设备103的信息向UPF网元104(当然也可以是其他UPF网元)下发指示信息或转发规则，该指示信息或转发规则用于指示UPF网元104处理和转发上行和/或下行数据包。本申请实施例中，SMF网元在指示信息或转发规则中可以指示UPF网元104在收到该指示信息或转发规则后，开始向RAN设备102和RAN设备103双播下行报文。
AMF网元105不仅向SMF网元106提供RAN设备103的信息，还向RAN设备102发送切换命令，触发RAN设备进行空口切换。
本申请一个实施例的通信方法的示意性流程图如图2所示。图2所示的方法中可以包括S201、S202和S203。
应理解，图2示出了该方法的步骤或操作，但这些步骤或操作仅是示例，本申请实施例还可以执行其他操作或者图2中的各个操作的变形。此外，图2中的各个步骤可以按照与图2呈现的不同的顺序来执行，并且有可能并非要执行图2中的全部操作。
S201，在服务终端的接入网设备从源接入网设备切换到目标接入网设备的过程中，用户面功能网元确定向源接入网设备和目标接入网设备双播下行报文。
例如，会话管理功能网元向该用户面功能网元下发指示信息或转发规则，该用户面功能网元接收到该指示信息或转发规则后，可以确定需要向源接入网设备和目标接入网设备双播下行报文。
用户面功能网元向该源接入网设备和该目标接入网设备双播下行报文可以理解为：用户面功能网元同时向该源接入网设备和该目标接入网设备发送从数据网络(Data Network，DN)接收到的下行报文。
例如，用户面功能网元将从DN接收的下行报文，进行封装后发送给源接入网设备和目标接入网设备。
例如，用户面功能网元根据该下行报文封生成第一下行报文和第二下行报文，向源接入网设备发送该第一下行报文，向目标接入网设备发送第二下行报文。
例如，用户面功能网元可以将从DN接收的下行报文添加不同的通用分组无线服务技术(general packet radio service，GPRS)隧道协议(tunnelling protocol for the user plane，GTP-U)头，生成第一下行报文和第二下行报文，分别发送给源接入网设备和目标接入网设备。
该用户面功能网元可以是UPF网元104，该终端可以是UE 101，该源接入网设备可以是RAN设备102，该目标接入网设备可以是RAN设备103。
S202，用户面功能网元向源接入网设备发送第一信息，该第一信息用于指示该用户面功能网元向源接入网设备和目标接入网设备双播下行报文。
也就是说，用户面功能网元确定可以向源接入网设备和目标接入网设备双播下行报文后，可以向源接入网设备发送表示用户面功能网元向源接入网设备和目标接入网设备双播下行报文的第一信息。
可选地，用户面功能网元向终端的源接入网设备发送第一信息时，用户面功能网元可以是已经开始向源接入网设备和目标接入网设备双播下行报文。相应地，源接入网设备和目标接入网设备从用户面功能网元接收该下行报文。
在这种实现方式中，用户面功能网元可以仅在向源接入网设备发送的下行报文(例如，上述第一下行报文)中携带第一信息，也可以是在向源接入网设备和目标接入网设备发送的下行报文(例如，上述第一和第二下行报文)中均携带第一信息。
例如，该第一信息可以携带在用户面功能网元向源接入网设备双播的第一个下行报文中。
在这种实现方式中，为了增加第一信息的传输可靠性，例如，防止出现源接入网设备没有接收到用户面功能网元双播的第一个下行报文，从而导致没有接收到第一信息的情况，用户面功能网元可以在发送给源接入网设备双播的前N个下行报文中均携带第一信息。
在这种实现方式中，用户面功能网元可以在报文的GTP-U头中设置标识位来指示第 一信息。
例如，可以在步骤S201中所述的第二下行报文的GTP-U头中设置标识位来指示第一信息。
例如，可以将GTP-U头的特定标识位设置为“0”或“1”，以指示用户面功能网元向源接入网设备和目标接入网设备双播下行报文，其中的“0”或“1”即为第一信息。
可选地，用户面功能网元可以在即将开始向源接入网设备和目标接入网设备双播下行报文之前，向终端的源接入网设备发送第一信息。也就是说，在发送第一信息之后，用户面功能网元开始向源接入网设备和目标接入网设备双播下行报文。相应地，源接入网设备和目标接入网设备从用户面功能网元接收该下行报文。
例如，用户面功能网元可以在双播第一个下行报文之前，向源接入网设备发送一个或多个携带第一信息的第一下行报文，以指示双播即将开始，随后发送的报文为双播报文。
S203，在将第一信息之前接收的数据包发送至终端后，源接入网设备触发空口切换。
该空口切换可以指Uu口切换。
源接入网设备触发空口切换可以包括：源接入网设备向终端发送切换命令消息，指示终端设备开始执行切换；和/或，源接入网设备停止向终端发送下行数据。
本申请实施例中，通过用户面功能网元向终端的源接入网设备发送第一信息，以指示双播开始。源接入网设备从用户面功能网元接收第一信息后，在将所述第一信息之前接收的数据包发送至所述终端后，触发空口切换，从而可以保证终端设备在切换到目标接入网设备前，源接入网设备已经将双播开始之前的报文发送给终端设备，避免了切换过程中的丢包。
本申请另一个实施例的通信方法的示意性流程图如图3所示。图3所示的方法中可以包括S301、S302、S303和S304。
应理解，图3示出了该方法的步骤或操作，但这些步骤或操作仅是示例，本申请实施例还可以执行其他操作或者图3中的各个操作的变形。此外，图3中的各个步骤可以按照与图3呈现的不同的顺序来执行，并且有可能并非要执行图3中的全部操作。
S301，在服务终端的接入网设备从源接入网设备切换到目标接入网设备的过程中，用户面功能网元确定向源接入网设备和目标接入网设备双播下行报文。
S302，用户面功能网元向源接入网设备发送第一信息，该第一信息用于指示该用户面功能网元向源接入网设备和目标接入网设备双播下行报文。
步骤S301和S302可分别参考图2中S201和S202的描述，此处不再赘述。
S303，源接入网设备向目标接入网设备发送第二信息，该第二信息用于用户面功能网元向该源接入网设备和该目标接入网设备双播的下行报文中的下行数据的PDCP SN的确定。相应地，该目标接入网设备从该源接入网设备接收该第二信息。
或者可以说，第二信息用于目标接入网设备确定用户面功能网元双播的下行报文中的下行数据的PDCP SN。
也就是说，该源接入网设备检测到第一信息后，可以向目标接入网设备发送该第二信息，以便于目标接入网设备根据该第二信息确定从用户面功能网元接收的下行报文中的下行数据的PDCP SN。该下行报文为用户面功能网元向该源接入网设备和该目标接入网设 备双播的下行报文。
在一些可能的实现方式中，第二信息可以携带在源接入网设备向目标接入网设备发送序列号状态传输(SN status transfer)消息中；在一些可能的实现方式中，第二信息可以包括源接入网设备分配给第一个双播报文的PDCP SN；在一些可能的实现方式中，第二信息可以包括源接入网设备分配给第一个双播报文之前的一个报文的PDCP SN。
S304，目标接入网设备根据从源接入网设备接收的第二信息和从用户面功能网元接收的下行报文，生成PDCP报文。该下行报文包括用户面功能网元向源接入网设备和目标接入网设备双播的下行报文。
例如，第二信息包括源接入网设备分配给第一个双播报文的PDCP SN时，目标接入网设备可以将该PDCP SN分配给从用户面功能网元接收到的第一个双播下行报文。第二信息包括源接入网设备分配给第一个双播报文之前的一个报文的PDCP SN时，目标接入网设备可以将该PDCP SN加1后分配给从用户面功能网元接收到的第一个双播下行报文。
本申请实施例中，通过用户面功能网元向终端的源接入网设备发送第一信息，以指示双播开始，从而使得源接入网设备可以向目标接入网设备同步下行PDCP序列号，目标接入网设备可以向终端发送根据该序列号封装的PDCP报文，使得终端可以根据收到的PDCP报文中的序列号对接收到的报文做排序和去重处理。
在图3所示的通信方法中，可选地，还可以包括图2中的S203。在图2所示通信方法中，可选地，还可以包括图3中的S303和/或S304。
在图2或图3所示的通信方法中，可选地，源接入网设备可以在接收到接入和移动性管理功能网元发送的切换命令(Handover Command)后开始检测第一示信息，所述切换命令用于指示所述源接入网设备核心网侧已经完成用户面建立和更新；或者，可以在给接入和移动性管理功能网元发送切换请求(Handover Required)消息后，开始检测第一信息。所述切换请求消息用于请求核心网侧开始建立和更新用户面。检测第一信息是指源接入网设备检测从用户面功能网元接收的下行报文是否包括第一信息。
该接入和移动性管理功能网元可以是AMF网元105。
下面以接入和移动性管理网元为AMF网元，会话管理功能网元为SMF网元，用户面功能网元为UFP网元，源接入网设备为S-RAN设备，目标接入网设备为T-RAN设备，UE从S-RAN设备切换到T-RAN设备时，S-RAN设备与T-RAN设备之间通过Xn接口交互信令消息，切换前后RAN设备连接的AMF网元与SMF网元不变，UPF网元双播的下行报文的GTP-U头中携带第一信息为例，结合图4，介绍本申请实施例一个实施例的通信方法的示意性流程图。
其中，S-RAN设备与T-RAN设备之间通过Xn接口交互信令消息，可以指S-RAN设备和T-RAN设备通过它们之间的Xn接口直接交互信令消息。
应理解，图4示出了该方法的步骤或操作，但这些步骤或操作仅是示例，本申请实施例还可以执行其他操作或者图4中的各个操作的变形。此外，图4中的各个步骤可以按照与图4呈现的不同的顺序来执行，并且有可能并非要执行图4中的全部操作。
S401，S-RAN设备根据从终端设备接收的测量报告确定终端设备满足切换条件后，向T-RAN设备发送切换请求(Handover Request)消息。
S402，T-RAN设备接收切换请求消息后，执行准入控制，确定接受切换的PDU会话 以及会话中包括的QoS流。
S403，T-RAN设备向S-RAN设备发送切换请求确认(Handover Request Acknowledge)消息。该消息中包括T-RAN设备的信息，例如，该步骤中T-RAN设备的信息包括T-RAN设备的N3隧道信息。该消息中还可以包括接受切换的PDU会话标识以及会话中包括的QoS流标识。
S404，S-RAN设备向AMF网元发送切换请求(Handover Required)消息，消息中包括T-RAN设备的信息。例如，该步骤中T-RAN设备的信息包括T-RAN设备的标识(identity，ID)和T-RAN设备的N3隧道信息。消息中还可以包括接受切换的PDU会话标识以及会话中包括的QoS流标识。
S405，AMF网元向SMF网元发送PDU会话上下文更新请求(Nsmf_PDU Session_UpdateSMContextRequest)消息，消息中包括步骤S404获得的T-RAN设备的信息,以及可以接受切换的PDU会话标识以及会话中包括的QoS流标识。
S406，SMF网元根据步骤405中从AMF网元接收的PDU会话上下文更新请求消息中包括的信息，确定需要执行双播下行报文，并根据T-RAN设备的信息给UPF网元下发指示信息或转发规则，以指示UPF开始向S-RAN和T-RAN双播下行报文。指示信息或转发规则携带在N4会话修改请求(N4 Session Modification Request)消息中发给UPF网元。
S407，AMF网元向S-RAN发送切换命令(Handover command)，指示S-RAN核心网侧已经完成切换准备。
S408，UPF网元接收到指示信息或转发规则，可以确定向S-RAN设备和T-RAN设备双播下行报文，并向S-RAN设备和T-RAN设备双播下行报文，其中，该下行报文中携带第一信息。
例如，UPF网元可以仅在向S-RAN设备发送的下行报文中携带第一信息，也可以是在向S-RAN设备和T-RAN设备发送的下行报文中均携带第一信息。
例如，可以在下行报文中的GTP-U头中设置标识位来携带该第一信息。
例如，可以将GTP-U头的特定标识位设置为“0”或“1”，以指示用户面功能网元向源接入网设备和目标接入网设备双播下行报文，其中的“0”或“1”即为第一信息。
为了增加可靠性，防止出现S-RAN设备无法接收第一个双播报文，进而无法完成UPF网元对双播的指示，UPF网元可以在最初的几个下行双播报文中携带该第一信息。
T-RAN设备接收到双播下行报文后，可以缓存该下行报文。
S409，S-RAN设备检测到第一信息以后，向T-RAN设备发送SN状态传输(SN Status Transfer)消息，该消息中携带第二信息，以使T-RAN设备可以根据第二信息确定可以分配给第一个双播报文的PDCP SN。
S410，T-RAN设备从S-RAN设备接收第二信息后，使用第二信息指示的PDCP SN封装缓存的下行报文，得到PDCP报文。
S411，S-RAN设备确认在第一信息之前接收的数据包已经发送至UE后，触发UE执行空口切换，UE同步到T-RAN设备并完成RRC切换过程，即与S-RAN设备的空口连接断开并与T-RAN设备建立空口连接。T-RAN开始从UE接收上行报文并向UE发送下行报文。
应理解，S407和S408步骤没有先后顺序关系，也就是说S407和S408可以同时执行，也可以S407先执行，也可以S308先执行；S411在S407和S408都完成之后执行；S411和S409没有先后顺序关系。
S412，T-RAN设备向AMF网元发送N2路径切换请求(N2 Path Switch Request)。
S413，AMF网元从T-RAN设备接收到N2路径切换请求后，向SMF网元发送PDU会话上下文更新请求，请求SMF网元更新会话上下文。
S414，SMF网元从AMF网元收到PDU会话上下文更新请求后，向UPF网元发送N4会话修改请求，指示UPF网元停止双播下行报文，仅向T-RAN设备转发UE的下行报文。
下面以接入和移动性管理网元为AMF网元，会话管理功能网元为SMF网元，用户面功能网元为UFP网元，源接入网设备为S-RAN设备，目标接入网设备为T-RAN设备，UE从S-RAN设备切换到T-RAN设备时，S-RAN设备与T-RAN设备之间通过Xn接口交互信令，切换前后的AMF网元与SMF网元不变，第一信息携带在在双播报文之前发送的下行报文中为例，结合图5，介绍本申请实施例一个实施例的通信方法的示意性流程图。
其中，S-RAN设备与T-RAN设备之间通过Xn接口交互信令消息，可以指S-RAN设备和T-RAN设备通过它们之间的Xn接口直接交互信令消息。
应理解，图5示出了该方法的步骤或操作，但这些步骤或操作仅是示例，本申请实施例还可以执行其他操作或者图5中的各个操作的变形。此外，图5中的各个步骤可以按照与图5呈现的不同的顺序来执行，并且有可能并非要执行图5中的全部操作。
S501至S507可以参考S401至S407，此处不再赘述。
S508，UPF网元接收到指示信息或转发规则，可以确定向S-RAN设备和T-RAN设备双播下行报文,UPF网元向S-RAN设备发送一个或多个携带第一信息的第一下行报文，以指示双播开始，及随后发送的报文为双播报文。
其中，第一信息可以携带在第一下行报文中。例如，如果该第一下行报文为GTP数据包，第一信息可以设置于GTP-U的头的特定标识位比如将特定标识位设置为“0”或“1”，此时该特定标识位内的第一信息也可以称为结束标记(end marker)，该结束标记用于指示双播即将开始，随后发送的报文为双播报文。除了该特定标识位外，所述携带第一指示信息的第一下行数据包的GTP-U头，还携带S-RAN与UPF网元之间传输该双播报文关联的会话的下行GTP-U隧道信息。
S509，UPF网元向S-RAN设备和T-RAN设备双播下行报文。
T-RAN设备接收到双播下行报文后，可以缓存该下行报文。
S510至S515可以参考S409至S414，此处不再赘述。
应理解，图4或图5所示的通信方法也可以应用于AMF网元与SMF网元中一个或两个改变的场景。这种场景下，只需将图4或图5中，发生改变的AMF网元或SMF网元分别替换为改变后的AMF网元或SMF网元即可。
下面以接入和移动性管理网元为AMF网元，会话管理功能网元为SMF网元，用户面功能网元为UFP网元，源接入网设备为S-RAN设备，目标接入网设备为T-RAN设备，UE从S-RAN设备切换到T-RAN设备时，S-RAN设备与T-RAN设备之间通过N2接口交互信令消息，切换前后RAN设备连接的AMF网元与SMF网元不变，UPF网元双播的下 行报文的GTP-U头中携带第一信息为例，结合图6，介绍本申请实施例一个实施例的通信方法的示意性流程图。
其中，S-RAN设备与T-RAN设备之间通过N2接口交互信令消息可以指S-RAN设备和T-RAN设备之间的消息交互由N2接口来实现。以S-RAN设备给T-RAN发消息为例，S-RAN设备通过N2接口将消息发送给AMF网元，AMF网元再通过N2接口发送给T-RAN设备。
应理解，图6示出了该方法的步骤或操作，但这些步骤或操作仅是示例，本申请实施例还可以执行其他操作或者图6中的各个操作的变形。此外，图6中的各个步骤可以按照与图6呈现的不同的顺序来执行，并且有可能并非要执行图6中的全部操作。
S601，S-RAN设备根据从终端设备接收的测量报告确定所述终端设备满足切换条件后，向AMF网元发送切换请求(Handover Required)，切换请求消息中包括T-RAN设备的信息，例如可以包括测量报告中携带的T-RAN设备ID，以及请求切换的PDU会话标识。
S602，AMF网元接收切换请求消息后，向SMF网元发送PDU会话上下文更新请求消息，消息中包括T-RAN设备的信息以及请求切换的PDU会话标识。
S603，SMF网元根据步骤602中从AMF网元接收的PDU会话上下文更新请求消息中包括的信息确定可以接受的PDU会话，并根据UPF选择标准确定是否需要增加一个中间UPF网元。
为了便于描述，本申请实施例假设不需要增加中间UPF网元。需要说明的是，本申请实施例的方法也适用于需要增加中间UPF网元的场景。
S604，SMF网元向AMF网元发送PDU会话上下文更新应答消息，消息中包括被接受的PDU会话标识信息。
S605，AMF网元从SMF网元接收PDU会话上下文更新应答消息后，根据步骤601中获取的T-RAN ID向T-RAN设备发送切换请求(Handover Request)消息，请求消息中包括步骤504中AMF网元从SMF网元接收的信息。
S606，T-RAN设备向AMF网元发送切换请求确认(Handover Request Acknowledge)消息，消息中包括被T-RAN网元接受的PDU会话标识以及会话中包括的QoS流标识，还包括T-RAN设备的N3隧道信息。
S607，AMF网元向SMF网元发送PDU会话上下文更新请求消息，消息中包括T-RAN设备的N3隧道信息,以及T-RAN设备接受切换的PDU会话标识以及会话中包括的QoS流标识。
S608，SMF网元根据步骤607中从AMF网元接收的PDU会话上下文更新请求消息中包括的信息，确定需要执行双播下行报文，并根据T-RAN设备的信息给UPF网元下发指示信息或转发规则，以指示UPF开始向S-RAN和T-RAN双播下行报文。指示信息或转发规则携带在N4会话修改请求中发给UPF网元。
S609，AMF网元向S-RAN发送切换命令，指示S-RAN核心网侧已经完成切换准备。
S610，UPF网元接收到指示信息或转发规则，可以确定向S-RAN设备和T-RAN设备双播下行报文，并向S-RAN设备和T-RAN设备双播下行报文，其中，该下行报文中携带第一信息。
例如，UPF网元可以仅在向S-RAN设备发送的下行报文中携带第一信息，也可以是在向S-RAN设备和T-RAN设备发送的下行报文中均携带第一信息。
例如，可以在下行报文中的GTP-U头中设置标识位来携带该第一信息。
例如，可以将GTP-U头的特定标识位设置为“0”或“1”，以指示用户面功能网元向源接入网设备和目标接入网设备双播下行报文，其中的“0”或“1”即为第一信息。
为了增加可靠性，防止出现S-RAN设备无法接收第一个双播报文，进而无法完成UPF网元对双播的指示，UPF网元可以在最初的几个下行双播报文中携带该第一信息。
T-RAN设备接收到双播下行报文后，可以缓存该下行报文。
S611，S-RAN设备检测到第一信息以后，向T-RAN设备发送SN状态传输消息，该消息中携带第二信息，以使T-RAN设备可以根据第二信息确定可以分配给第一个双播报文的PDCP SN。
需要说明的是，由于S-RAN设备和T-RAN设备通过N2接口交互，所述SN状态传输消息也是经过AMF网元转发的，即S-RAN设备将所述SN状态传输消息发送给AMF网元，AM F网元再发送给T-RAN设备。
S612，T-RAN设备从S-RAN设备接收第二信息后，使用第二信息指示的PDCP SN封装缓存的下行报文，得到PDCP报文。
S613，S-RAN设备确认在第一信息之前接收的数据包已经发送至UE后，触发UE执行空口切换，UE同步到T-RAN设备并完成RRC切换过程，即与S-RAN设备的空口连接断开并与T-RAN设备建立空口连接。T-RAN开始从UE接收上行报文并向UE发送下行报文。
S614，T-RAN设备向AMF发送切换通知消息。
S615，AMF设备从T-RAN设备接收到切换通知消息后，向SMF设备发送PDU会话上下文更新请求，请求SMF设备更新会话上下文。
S616，SMF设备从AMF设备收到PDU会话上下文更新请求后，向UPF发送N4会话修改请求，指示UPF停止双播下行报文，仅向T-RAN设备发送UE的下行报文。
应理解，S609和S610步骤没有先后顺序关系，也就是说S609和S610可以同时执行，也可以S609先执行，也可以S610先执行；S613在S610和S611都完成之后执行；S613和S611步骤没有先后顺序关系。
下面以接入和移动性管理网元为AMF网元，会话管理功能网元为SMF网元，用户面功能网元为UFP网元，源接入网设备为S-RAN设备，目标接入网设备为T-RAN设备，UE从S-RAN设备切换到T-RAN设备时，S-RAN设备与T-RAN设备之间通过N2接口交互信令消息，切换前后AMF网元与SMF网元不变，第一信息为携带在在双播报文之前发送的下行报文中为例，结合图7，介绍本申请实施例一个实施例的通信方法的示意性流程图。
其中，S-RAN设备与T-RAN设备之间通过N2接口交互信令消息可以指S-RAN设备和T-RAN设备之间的消息交互由N2接口来实现。以S-RAN设备给T-RAN发消息为例，S-RAN设备通过N2接口将消息发送给AMF网元，AMF网元再通过N2接口发送给T-RAN设备。
其中，第一信息可以携带在第一下行报文中。例如，如果该第一下行报文为GTP数 据包，第一信息可以设置于GTP-U的头的特定标识位比如将特定标识位设置为“0”或“1”，此时该特定标识位内的第一信息也可以称为结束标记(end marker)，该结束标记用于指示双播即将开始，随后发送的报文为双播报文。除了该特定标识位外，所述携带第一指示信息的第一下行数据包的GTP-U头，还携带S-RAN与UPF网元之间传输该双播报文关联的会话的下行GTP-U隧道信息。
应理解，图7示出了该方法的步骤或操作，但这些步骤或操作仅是示例，本申请实施例还可以执行其他操作或者图7中的各个操作的变形。此外，图7中的各个步骤可以按照与图7呈现的不同的顺序来执行，并且有可能并非要执行图7中的全部操作。
S701至S709可以参考S601至S609，此处不再赘述。
S710至S711可以参考S508至S509，此处不再赘述。
S712至S717可参考S611至S616，此处不再赘述。
应理解，图6或图7所示的通信方法也可以应用于AMF网元改变的场景。这种场景下，只需将图6或图7中，源接入网设备向AMF网元发替换为目标AMF网元，即改变后的AMF网元即可。其中源接入网设备向目标AMF网元发送的消息是通过源AMF网元转发的。
应理解，图4至图7所示的通信方法中，UPF网元可以指锚点UPF(Anchor UPF)，即PDU会话锚点(PDU Session Anchor，PSA)。图4至图7所示的通信方法也适用于接入网设备和锚点UPF网元之间有中间UPF(Intermediate UPF)网元的情况，此时中间UPF网元仅在接入网设备和锚点UPF网元之间发送上下行报文。
图8是本申请实施例的通信装置800的示意性框图。应理解，通信装置800仅是一种示例。本申请实施例的通信装置还可包括其他模块或单元，或者包括与图8中的各个模块的功能相似的模块，或者并非要包括图8中的所有模块。
在一些实施方式中，通信装置800可以是用户面功能网元。
处理模块810，用于在服务终端的接入网设备从源接入网设备切换到目标接入网设备的过程中，确定向所述源接入网设备和所述目标接入网设备双播下行报文。
发送模块820，用于向所述源接入网设备发送第一信息，所述第一信息用于指示用户面功能网元向所述源接入网设备和所述目标接入网设备双播下行报文。
可选地，所述发送模块具体用于：向所述源接入网设备和所述目标接入网设备双播下行报文，用户面功能网元向源接入网设备双播的所述下行报文中包括所述第一信息。
可选地，所述通信装置向所述源接入网设备双播的前N个下行报文中均携带所述第一信息，N为正整数。
可选地，所述发送模块具体用于：在发送所述第一信息之后，向所述源接入网设备和所述目标接入网设备双播下行报文。
通信装置800可以用于执行图2至图7描述的方法中由用户面功能网元执行的步骤，为了简洁，此处不再赘述。
图9是本申请实施例的通信装置900的示意性框图。应理解，图9示出的通信装置仅是示例，本申请实施例的通信装置还可包括其他模块或单元，或者包括与图9中的各个模块的功能相似的模块，或者并非要包括图9中的所有模块。
在一些实施方式中，通信装置900可以是接入网设备。
接收模块910，用于在服务终端的接入网设备从源接入网设备切换到目标接入网设备的过程中，从用户面功能网元接收第一信息，所述第一信息用于指示所述用户面功能网元向所述源接入网设备和所述目标接入网设备双播下行报文。
发送模块920，用于从所述用户面功能网元接收第一信息后，向所述目标接入网设备发送第二信息，所述第二信息用于所述下行报文中的下行数据的分组数据汇聚协议序列号的确定。
可选地，所述接收模块具体用于：接收所述用户面功能网元向所述源接入网设备和所述目标接入网设备双播的下行报文，用户面功能网元向源接入网设备双播的所述下行报文中包括所述第一信息。
可选地，所述用户面功能网元向所述源接入网设备双播的前N个下行报文中均携带所述第一信息，N为正整数。
可选地，所述接收模块具体用于：在接收所述第一信息之后，接收所述用户面功能网元向所述源接入网设备和所述目标接入网设备双播的下行报文。
可选地，所述通信装置900还包括切换模块930，用于在将所述第一信息之前接收的数据包发送至所述终端后，触发空口切换。
可选地，所述切换模块具体用于向所述终端发送切换命令消息；或具体用于停止向所述终端发送下行数据。
可选地，所述通信装置还包括检测模块940，用于从接入和移动性管理功能网元接收切换命令后，或在向所述接入和移动性管理功能网元发送切换请求消息后，开始检测是否接收到所述第一信息。
通信装置900可以用于执行图2至图7描述的方法中由源接入网设备执行的步骤，为了简洁，此处不再赘述。
图10是本申请实施例的通信装置1000的示意性框图。应理解，图10示出的通信装置仅是示例，本申请实施例的通信装置还可包括其他模块或单元，或者包括与图10中的各个模块的功能相似的模块，或者并非要包括图10中的所有模块。
在一些实施方式中，通信装置1000可以是接入网设备。
接收模块1010，用于在服务终端的接入网设备从源接入网设备切换到目标接入网设备的过程中，从用户面功能网元接收第一信息，所述第一信息用于指示所述用户面功能网元向所述源接入网设备和所述目标接入网设备双播下行报文。
切换模块1020，用于在将所述第一信息之前接收的数据包发送至所述终端后，触发空口切换。
可选地，所述切换模块具体用于向所述终端发送切换命令消息；或具体用于停止向所述终端发送下行数据。
可选地，所述接收模块具体用于：接收所述用户面功能网元向所述源接入网设备和所述目标接入网设备双播的下行报文，所述用户面功能网元向所述源接入网设备双播的所述下行报文中包括所述第一信息。
可选地，所述用户面功能网元向所述源接入网设备双播的前N个下行报文中均携带所述第一信息，N为正整数。
可选地，所述接收模块具体用于：在接收所述第一信息之后，接收所述用户面功能网 元向所述源接入网设备和所述目标接入网设备双播的下行报文。
可选地，所述通信装置1000还包括检测模块1030，用于从接入和移动性管理功能网元接收切换命令后，或在向所述接入和移动性管理功能网元发送切换请求消息后，开始检测是否接收到所述第一信息。
可选地，所述通信装置1000还包括发送模块1040，用于向所述目标接入网设备发送第二信息，所述第二信息用于所述下行报文中的下行数据的分组数据汇聚协议序列号的确定。
通信装置1000可以用于执行图2至图7描述的方法中由源接入网设备执行的步骤，为了简洁，此处不再赘述。
图11是本申请实施例的通信装置1100的示意性框图。应理解，图11示出的通信装置仅是示例，本申请实施例的通信装置还可包括其他模块或单元，或者包括与图11中的各个模块的功能相似的模块，或者并非要包括图11中的所有模块。
在一些实施方式中，通信装置1100可以是接入网设备。
接收模块1110，用于在服务终端的接入网设备从源接入网设备切换到目标接入网设备的过程中，从用户面功能网元接收所述用户面功能网元向所述源接入网设备和所述目标接入网设备双播的下行报文。
所述接收模块1110还用于从所述源接入网设备接收第二信息，所述第二信息用于所述下行报文中的下行数据的分组数据汇聚协议序列号的确定；
处理模块1120，用于根据所述第二信息和所述下行报文，生成分组数据汇聚协议报文。
可选地，所述通信装置还包括缓存模块1130，用于在接收所述第二信息之前，缓存所述下行报文。
通信装置1100可以用于执行图2至图7描述的方法中由目标接入网设备执行的步骤，为了简洁，此处不再赘述。
图12是本申请另一个实施例的通信装置的示意性结构图。应理解，图12示出的通信装置1200仅是示例，本申请实施例的通信装置还可包括其他模块或单元，或者包括与图12中的各个模块的功能相似的模块。
通信装置1200可以包括一个或多个处理器1210、一个或多个存储器1220、接收器1230和发送器1240。接收器1230和发送器1240可以集成在一起，称为收发器。存储器1220用于存储处理器1210执行的程序代码。其中，处理器1210中可以集成有存储器1220，或者处理器1210耦合到一个或多个存储器1220，用于调取存储器1220中的指令。
在一个实施例中，处理器1210可以用于实现图8中的处理模块810能够实现的操作或步骤，发送器1240可以用于实现图8中的发送模块820能够实现的操作或步骤。
在另一个实施例中，处理器1210可以用于实现图9中的切换模块930和检测模块940能够实现的操作或步骤，接收器1230可以用于实现图9中的接收模块910能够实现的操作或步骤，发送器1240可以用于实现图9中的发送模块920能够实现的操作或步骤。
在另一个实施例中，处理器1210可以用于实现图10中的切换模块1020和检测模块1030能够实现的操作或步骤，接收器1230可以用于实现图10中的接收模块1010能够实现的操作或步骤，发送器1240可以用于实现图10中的发送模块1040能够实现的操作或 步骤。
在又一个实施例中，处理器1210可以用于实现图11中的处理模块1120能够实现的操作或步骤，接收器1230可以用于实现图11中的接收模块1110能够实现的操作或步骤，存储器1220用于存储处理器1210执行的程序代码以及实现图11中的缓存模块1130能够实现的操作或步骤。
本领域普通技术人员可以意识到，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，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，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。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、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，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，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，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(read-only memory，ROM)、随机存取存储器(random access memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (32)

  1. 一种通信方法，其特征在于，包括：
    在服务终端的接入网设备从源接入网设备切换到目标接入网设备的过程中，
    用户面功能网元确定向所述源接入网设备和所述目标接入网设备双播下行报文；
    所述用户面功能网元向所述源接入网设备发送第一信息，所述第一信息用于指示所述用户面功能网元向所述源接入网设备和所述目标接入网设备双播下行报文。
  2. 根据权利要求1所述的通信方法，其特征在于，所述用户面功能网元向所述源接入网设备发送第一信息，包括：
    所述用户面功能网元向所述源接入网设备和所述目标接入网设备双播下行报文，
    所述用户面功能网元向所述源接入网设备双播的所述下行报文中包括所述第一信息。
  3. 根据权利要求2所述的通信方法，其特征在于，所述用户面功能网元向所述源接入网设备双播的前N个下行报文中均携带所述第一信息，N为正整数。
  4. 根据权利要求1所述的通信方法，其特征在于，所述通信方法还包括：
    所述用户面功能网元在发送所述第一信息之后，向所述源接入网设备和所述目标接入网设备双播下行报文。
  5. 一种通信方法，其特征在于，包括：
    在服务终端的接入网设备从源接入网设备切换到目标接入网设备的过程中，
    所述源接入网设备从用户面功能网元接收第一信息，所述第一信息用于指示所述用户面功能网元向所述源接入网设备和所述目标接入网设备双播下行报文；
    所述源接入网设备向所述目标接入网设备发送第二信息，所述第二信息用于所述下行报文中的下行数据的分组数据汇聚协议序列号的确定。
  6. 根据权利要求5所述的通信方法，其特征在于，所述通信方法还包括：
    在将所述第一信息之前接收的数据包发送至所述终端后，所述源接入网设备触发空口切换。
  7. 根据权利要求6所述的通信方法，其特征在于，所述源接入网设备触发空口切换包括：所述源接入网设备向所述终端发送切换命令消息；或所述源接入网设备停止向所述终端发送下行数据。
  8. 一种通信方法，其特征在于，包括：
    在服务终端的接入网设备从源接入网设备切换到目标接入网设备的过程中，
    所述源接入网设备从用户面功能网元接收第一信息，所述第一信息用于指示所述用户面功能网元向所述源接入网设备和所述目标接入网设备双播下行报文；
    在将所述第一信息之前接收的数据包发送至所述终端后，所述源接入网设备触发空口切换。
  9. 根据权利要求8所述的通信方法，其特征在于，所述源接入网设备触发空口切换包括：所述源接入网设备向所述终端发送切换命令消息；或所述源接入网设备停止向所述终端发送下行数据。
  10. 根据权利要求5至9中任一项所述的通信方法，其特征在于，所述源接入网设备 从用户面功能网元接收第一信息，包括：
    所述源接入网设备接收所述用户面功能网元向所述源接入网设备和所述目标接入网设备双播的下行报文，所述用户面功能网元向所述源接入网设备双播的所述下行报文中包括所述第一信息。
  11. 根据权利要求10所述的通信方法，其特征在于，所述用户面功能网元向所述源接入网设备双播的前N个下行报文中均携带所述第一信息，N为正整数。
  12. 根据权利要求5至9中任一项所述的通信方法，其特征在于，所述通信方法还包括：
    所述源接入网设备在接收所述第一信息之后，接收所述用户面功能网元向所述源接入网设备和所述目标接入网设备双播的下行报文。
  13. 根据权利要求5至12中任一项所述的通信方法，其特征在于，所述通信方法还包括：
    所述源接入网设备从接入和移动性管理功能网元接收切换命令后，或在向所述接入和移动性管理功能网元发送切换请求消息后，开始检测是否接收到所述第一信息。
  14. 一种通信方法，其特征在于，包括：
    在服务终端的接入网设备从源接入网设备切换到目标接入网设备的过程中，
    所述目标接入网设备从用户面功能网元接收所述用户面功能网元向所述源接入网设备和所述目标接入网设备双播的下行报文；
    所述目标接入网设备从所述源接入网设备接收第二信息，所述第二信息用于所述下行报文中的下行数据的分组数据汇聚协议序列号的确定；
    所述目标接入网设备根据所述第二信息和所述下行报文，生成分组数据汇聚协议报文。
  15. 根据权利要求14所述的通信方法，其特征在于，所述通信方法还包括：
    在接收所述第二信息之前，所述目标接入网设备缓存所述下行报文。
  16. 一种通信装置，其特征在于，包括：
    处理模块，用于在服务终端的接入网设备从源接入网设备切换到目标接入网设备的过程中，确定向所述源接入网设备和所述目标接入网设备双播下行报文；
    发送模块，用于向所述源接入网设备发送第一信息，所述第一信息用于指示用户面功能网元向所述源接入网设备和所述目标接入网设备双播下行报文。
  17. 根据权利要求16所述的通信装置，其特征在于，所述发送模块具体用于：向所述源接入网设备和所述目标接入网设备双播下行报文，所述用户面功能网元向所述源接入网设备双播的所述下行报文中包括所述第一信息。
  18. 根据权利要求17所述的通信装置，其特征在于，所述通信装置向所述源接入网设备双播的前N个下行报文中均携带所述第一信息，N为正整数。
  19. 根据权利要求16所述的通信装置，其特征在于，所述发送模块具体用于：在发送所述第一信息之后，向所述源接入网设备和所述目标接入网设备双播下行报文。
  20. 一种通信装置，其特征在于，包括：
    接收模块，用于在服务终端的接入网设备从源接入网设备切换到目标接入网设备的过程中，从用户面功能网元接收第一信息，所述第一信息用于指示所述用户面功能网元向所 述源接入网设备和所述目标接入网设备双播下行报文；
    发送模块，用于向所述目标接入网设备发送第二信息，所述第二信息用于所述下行报文中的下行数据的分组数据汇聚协议序列号的确定。
  21. 根据权利要求20所述的通信装置，其特征在于，所述通信装置还包括切换模块，用于在将所述第一信息之前接收的数据包发送至所述终端后，触发空口切换。
  22. 根据权利要求21所述的通信装置，其特征在于，所述切换模块具体用于向所述终端发送切换命令消息；或所述切换模块具体用于停止向所述终端发送下行数据。
  23. 一种通信装置，其特征在于，包括：
    接收模块，用于在服务终端的接入网设备从源接入网设备切换到目标接入网设备的过程中，从用户面功能网元接收第一信息，所述第一信息用于指示所述用户面功能网元向所述源接入网设备和所述目标接入网设备双播下行报文；
    切换模块，用于在将所述第一信息之前接收的数据包发送至所述终端后，触发空口切换。
  24. 根据权利要求23所述的通信装置，其特征在于，所述切换模块具体用于向所述终端发送切换命令消息；或具体用于停止向所述终端发送下行数据。
  25. 根据权利要求20至24中任一项所述的通信装置，其特征在于，所述接收模块具体用于：接收所述用户面功能网元向所述源接入网设备和所述目标接入网设备双播的下行报文，所述用户面功能网元向所述源接入网设备双播的所述下行报文中包括所述第一信息。
  26. 根据权利要求25所述的通信装置，其特征在于，所述用户面功能网元向所述源接入网设备双播的前N个下行报文中均携带所述第一信息，N为正整数。
  27. 根据权利要求20至24中任一项所述的通信装置，其特征在于，所述接收模块具体用于：在接收所述第一信息之后，接收所述用户面功能网元向所述源接入网设备和所述目标接入网设备双播的下行报文。
  28. 根据权利要求20至27中任一项所述的通信装置，其特征在于，所述通信装置还包括检测模块，用于从接入和移动性管理功能网元接收切换命令后，或在向所述接入和移动性管理功能网元发送切换请求消息后，开始检测是否接收到所述第一信息。
  29. 一种通信装置，其特征在于，包括：
    接收模块，用于在服务终端的接入网设备从源接入网设备切换到目标接入网设备的过程中，从用户面功能网元接收所述用户面功能网元向所述源接入网设备和所述目标接入网设备双播的下行报文；
    所述接收模块还用于从所述源接入网设备接收第二信息，所述第二信息用于所述下行报文中的下行数据的分组数据汇聚协议序列号的确定；
    处理模块，用于根据所述第二信息和所述下行报文，生成分组数据汇聚协议报文。
  30. 根据权利要求29所述的通信装置，其特征在于，所述通信装置还包括缓存模块，用于在接收所述第二信息之前，缓存所述下行报文。
  31. 一种计算机可读存储介质，其特征在于，所述存储介质上存储有程序，当程序运行时，实现如权利要求1至15中任一项所述的通信方法。
  32. 一种通信装置，其特征在于，包括：
    与程序指令相关的硬件，所述硬件用于执行权1至15中任一项所述的通信方法。
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