WO2021031861A1 - 数据回传方法以及设备 - Google Patents

数据回传方法以及设备 Download PDF

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Publication number
WO2021031861A1
WO2021031861A1 PCT/CN2020/107277 CN2020107277W WO2021031861A1 WO 2021031861 A1 WO2021031861 A1 WO 2021031861A1 CN 2020107277 W CN2020107277 W CN 2020107277W WO 2021031861 A1 WO2021031861 A1 WO 2021031861A1
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WIPO (PCT)
Prior art keywords
data
access network
network device
terminal device
backhaul
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PCT/CN2020/107277
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English (en)
French (fr)
Inventor
杨晨晨
李欢
晋英豪
韩锋
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华为技术有限公司
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Publication of WO2021031861A1 publication Critical patent/WO2021031861A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point

Definitions

  • This application relates to the field of communications, and in particular to a method and equipment for data back transmission.
  • the terminal equipment needs to be switched from the access network equipment 1 to the access network equipment 2. Take the example of data behavior. Before switching, the data network sends data to the access network device 1, and the access network device 1 sends the data to the terminal device. After the switching, the data network sends the data to the access network device 2. And sent by the access network device 2 to the terminal device.
  • the terminal device switches from the access network device 1 to the access network device 2, which will cause the access network device 1
  • the data cannot be sent to the terminal device, and the data can be called return data.
  • the access network equipment 1 and the access network equipment 2 belong to the same networking mode, that is, when the access network equipment 1 and the access network equipment 2 are switched on the same network, the access network equipment 1 and the access network equipment 2 There is usually a data transmission channel between the access network device 1 and the access network device 2 through which the access network device 1 can send back data to the access network device 2 and then the access network device 2 to the terminal device.
  • the access network device 1 and the access network device 2 do not belong to the same networking mode, that is, when the access network device 1 and the access network device 2 are switched across the network, the access network device 1 cannot transmit back The data is sent to the access network device 2.
  • this application provides a data return method, which can return the returned data across the network.
  • a data backhaul method is provided.
  • a first access network device is located in a source network
  • a second access network device is located in a target network.
  • the source network and the target network respectively adopt different network types, so
  • the network type includes a public network and a private network.
  • the terminal device moves from the first access network device to the second access network device, and the method includes:
  • the second access network device receives first backhaul data from the network device through the target network segment data backhaul channel, where the first backhaul data is data from the first access network device through the source network segment
  • the backhaul channel is sent to the network device, the first backhaul data is data of the target network sent by the first access network device but not successfully received by the terminal device, and the network device is A first user plane function UPF or a first non-third-generation partner project interworking function N3IWF, where the first UPF is located in the source network, and the first N3IWF is located in the source network;
  • the second access network device receives second backhaul data from the network device through the target network segment data backhaul channel, where the second backhaul data is data from the first access network device through the source network segment
  • the backhaul channel is sent to the network device, and the second backhaul data is out-of-sequence data from the terminal device received by the first access network device or from the terminal device received by the first access network device The data that needs to be reordered;
  • the second access network device receives second data from the terminal device
  • the second access network device sends the second backhaul data and the second data to the second UPF.
  • a transmission channel is established between the first access network device and the second access network device that belong to different network types, so as to realize the return data from the first access network device to the second access network device.
  • the second access network device sending the first backhaul data and the first data to the terminal device includes:
  • the second access network device receives the first return data information, where the first return data information carries one or more of the following: the reason for the data return, the type of data return, and the data required
  • the sending, by the second access network device, the second backhaul data and the second data to the second UPF includes:
  • the second access network device receives second return data information, and the second return data information carries one or more of the following: the reason for the need for data return, the type of data return, and the need for data return
  • the source network is transmitted back to the target network;
  • the second access network device sends the second backhaul data and the second data to the second UPF according to the second backhaul data information.
  • At least one of the first backhaul data information and the second backhaul data information is sent through the N1 interface after the terminal device moves to the second access network device
  • the first AMF is located in the source network and sent by the first AMF to the first access network device
  • the first backhaul data is sent to the second access network device after the terminal device moves to the second access network device;
  • the N1 interface represents an interface through which the first access network device connects to the first AMF via the second access network device, the second UPF, and the first N3IWF.
  • the first return data information and the second return data information are sent to the first AMF through the N1 interface, so that the first AMF can send the first return data information and the second return data information To the first access network device.
  • At least one of the first backhaul data information and the second backhaul data information is before the terminal device moves to the second access network device, the first An access network device is sent to the terminal device, and after the terminal device moves to the second access network device, the terminal device is sent to the second access network device.
  • the terminal device may be used to realize the sending of the first backhaul data information and the second backhaul data information to the first access network device.
  • the source network segment data return channel is a channel from the first access network device to the first UPF; or;
  • the source network segment data return channel is a channel from the first access network device to the first N3IWF.
  • the source network segment data backhaul channel is generated by the first access network device and the first UPF according to the configuration of transmission network layer information
  • the transmission network layer information includes uplink forwarding transmission
  • the uplink forwarding user plane transmission network layer information includes the uplink transmission layer address and the uplink general packet radio service technology tunnel protocol GTP tunnel port identifier
  • the downlink forwarding user plane transmission network layer information includes the downlink transport layer address and the downlink GTP tunnel port identifier.
  • the transmission network layer information is generated by the first UPF, and the transmission network layer information is sent by the first UPF to the first access network device through the first AMF of.
  • the terminal device is configured to send a movement notification to the first AMF after moving from the first access network device to the second access network device, where the mobile The notification is used to notify the first AMF that the terminal device moves from the first access network device to the second access network device.
  • the mobile notification is sent by the terminal device to the first AMF through the N1 interface.
  • the terminal device is configured to move from the first access network device to the second access network device after sending a ready to move notification to the first access network device, where The notification of preparing to move is used to notify the first access network device that the terminal device is ready to move from the first access network device to the second access network device.
  • the target network segment data return channel is a channel from the first UPF to the second access network device; or;
  • the target network segment data return channel is a channel from the first N3IWF to the second access network device.
  • the target network segment data return channel belongs to the PDU session resource established between the terminal device and the source network
  • the second access network device instructs the terminal device to transfer the first backhaul data and the first data through the PDU session resource established between the terminal device and the target network. Sent to the terminal device; or,
  • the second access network device instructs the terminal device to transfer the first backhaul data to the first data through the PDU session resource established between the terminal device and the source network Sent to the terminal device; or,
  • the second access network device instructs the terminal device to send the first backhaul data to the terminal device through the PDU session resource established between the terminal device and the source network And, sending the first data to the terminal device through a PDU session resource established between the terminal device and the target network.
  • the target network segment data return channel is a dedicated data return channel
  • the second access network device sends the first backhaul data and the first data to the terminal device through the PDU session resource established between the terminal device and the target network.
  • the second access network device first sends the first backhaul data to the terminal device, and then sends the first data to the terminal device; or,
  • the second access network device first sends the second backhaul data to the second UPF, and then sends the second data to the second UPF.
  • the second access network device performs packet data convergence protocol PDCP numbering on the first backhaul data and the first data, so as to obtain the numbered first backhaul data and the first data;
  • the second access network device sends the numbered second backhaul data and the second data to the second UPF.
  • the first backhaul data includes a first message header and a second message header, where the first message header is the first backhaul data from the target network to the When the first access network device sends and passes through the first N3IWF, the second packet header is the first backhaul data from the first access network device to the second access network Added when the device sends and passes through the first N3IWF again.
  • the source network is an NPN network
  • the target network is a PLMN network
  • the source network is a PLMN network
  • the target network is an NPN network
  • a data backhaul method is provided, a first access network device is located in a source network, a second access network device is located in a target network, and the source network and the target network adopt different network types, so The network type includes a public network and a private network.
  • the terminal device moves from the first access network device to the second access network device, and the method includes:
  • the first access network device receives backhaul data sent by the target network, where the backhaul data is the target sent by the first access network device but not successfully received by the terminal device Network data, or data of the target network sent by the first access network device but not successfully received by the target network;
  • the first access network device sends the backhaul data to the network device through the source network segment data backhaul channel, so that the network device can send the backhaul data to the second connection through the target network segment data backhaul channel.
  • Network access equipment
  • a transmission channel is established between the first access network device and the second access network device that belong to different network types. Therefore, the first access network device can pass through the first access network device and the second access network device.
  • the transmission channel established between the two access network devices returns the backhaul data from the first access network device to the second access network device.
  • the first access network device acquires backhaul data information, where the backhaul data information carries one or more of the following: the reason for the need for data backhaul, the type of data backhaul, The ID of the PDU session that needs data backhaul, the ID of the data radio bearer DRB, or the QoS flow ID of the quality of service QoS flow corresponding to the DRB, the reason for the data backhaul includes movement, and the type of the data backhaul Including backhaul from the source network to the target network;
  • the first access network device sends the backhaul data information to the second access network device.
  • the backhaul data information is sent to the first access and mobility management function AMF through the N1 interface after the terminal device moves to the second access network device, and the first AMF Located in the source network and sent by the first AMF to the first access network device, and at least one of the first backhaul data information and the second backhaul data information is After the terminal device is moved to the second access network device, it is sent to the second access network device; wherein, the N1 interface indicates that the first access network device accesses via the second access network device.
  • the network device, the second UPF, and the first N3IWF are connected to the interface of the first AMF.
  • the returned data information is sent by the first access network device to the terminal device before the terminal device moves to the second access network device, and the terminal device After the device moves to the second access network device, the terminal device sends it to the second access network device.
  • the terminal device may be used to realize the sending of the first backhaul data information and the second backhaul data information to the first access network device.
  • the source network segment data return channel is the channel from the first access network device to the first UPF; or; the source network segment data return channel is the first Access network equipment to the first N3IWF channel.
  • the source network segment data backhaul channel is generated by the first access network device and the first UPF according to the configuration of transmission network layer information
  • the transmission network layer information includes uplink forwarding transmission
  • the uplink forwarding user plane transmission network layer information includes the uplink transmission layer address and the uplink general packet radio service technology tunnel protocol GTP tunnel port identifier
  • the downlink forwarding user plane transmission network layer information includes the downlink transport layer address and the downlink GTP tunnel port identifier.
  • the transmission network layer information is generated by the first UPF, and the transmission network layer information is sent by the first UPF to the first access network device through the first AMF of.
  • the terminal device is configured to send a movement notification to the first AMF after moving from the first access network device to the second access network device, where the mobile The notification is used to notify the first AMF that the terminal device moves from the first access network device to the second access network device.
  • the mobile notification is sent by the terminal device to the first AMF through the N1 interface.
  • the terminal device is configured to move from the first access network device to the second access network device after sending a ready to move notification to the first access network device, where The notification of preparing to move is used to notify the first access network device that the terminal device is ready to move from the first access network device to the second access network device.
  • the target network segment data return channel is the channel from the first UPF to the second access network device; or; the target network segment data return channel is the first The channel from the N3IWF to the second access network device.
  • the target network segment data return channel belongs to a PDU session resource established between the terminal device and the source network.
  • the target network segment data return channel is a dedicated data return channel.
  • the granularity of the returned data is the granularity of the PDU session.
  • the granularity of the returned data is the DRB granularity.
  • the returned data includes a first packet header and a second packet header, where the first packet header is the return data from the target network to the first packet header. It is added when the access network device sends and passes through the first N3IWF, and the second packet header is the return data sent from the first access network device to the second access network device and passes through all Added when the first N3IWF is mentioned.
  • the source network is an NPN network
  • the target network is a PLMN network
  • the source network is a PLMN network
  • the target network is an NPN network
  • a data backhaul method is provided, a first access network device is located in a source network, a second access network device is located in a target network, and the source network and the target network adopt different network types, so The network type includes a public network and a private network.
  • the terminal device moves from the first access network device to the second access network device, and the method includes:
  • the first AMF receives a mobile notification or a mobile preparation notification sent by a terminal device, where the first AMF belongs to the first access network device, and the mobile notification is used to notify the first AMF that the terminal device is The first access network device moves to the second access network device, and the preparation to move notification is used to notify the first access network device that the terminal device is ready to move from the first access network device to The second access network device;
  • the first AMF sends a backhaul channel establishment notification to the first UPF based on the movement notification or the ready to move notification, where the backhaul channel establishment notification is used to notify the first UPF1 to establish the first access network device to
  • the source network segment data return channel between network devices wherein the source network segment data return channel is used for the first access network device to send the return data to the network device, so that the The network device sends the backhaul data to the second access network device through the target network segment data backhaul channel, and the backhaul data is sent by the first access network device but not by the terminal device
  • the first AMF establishes a transmission channel between the first access network device and the second access network device that belong to different network types according to the mobile notification or the mobile ready notification, so as to realize the transmission
  • the data is transmitted back from the first access network device to the second access network device.
  • the first AMF receives the backhaul data information sent through the N1 interface after the terminal device moves to the second access network device, where the backhaul data information carries the following one Or more: the reason for the need for data backhaul, the type of data backhaul, the PDU session ID for which data backhaul is required, the ID of the data radio bearer DRB, or the QoS flow ID of the quality of service QoS flow corresponding to the DRB ,
  • the reason for the data return includes movement
  • the type of the data return includes the return from the source network to the target network;
  • the first AMF sends the backhaul data information to the second access network device.
  • the N1 interface represents an interface for the first access network device to connect to the first AMF via the second access network device, the second UPF, and the first N3IWF.
  • the source network segment data return channel is the channel from the first access network device to the first UPF; or; the source network segment data return channel is the first Access network equipment to the first N3IWF channel.
  • the source network segment data backhaul channel is generated by the first access network device and the first UPF according to the configuration of transmission network layer information
  • the transmission network layer information includes uplink forwarding transmission
  • the uplink forwarding user plane transmission network layer information includes the uplink transmission layer address and the uplink general packet radio service technology tunnel protocol GTP tunnel port identifier
  • the downlink forwarding user plane transmission network layer information includes the downlink transport layer address and the downlink GTP tunnel port identifier.
  • the first AMF receives the transport network layer information sent by the first UPF, where the transport network layer information is generated by the first UPF; the first AMF will The transmission network layer information is sent to the first access network device.
  • the first AMF receives the movement notification sent by the terminal device through the N1 interface.
  • the target network segment data return channel is the channel from the first UPF to the second access network device; or; the target network segment data return channel is the first The channel from the N3IWF to the second access network device.
  • the target network segment data return channel belongs to the PDU session resource established between the terminal device and the source network, or the target network segment data return channel is a dedicated data return channel aisle.
  • the granularity of the returned data is the granularity of the PDU session.
  • the granularity of the returned data is the DRB granularity.
  • the returned data includes a first packet header and a second packet header, where the first packet header is the return data from the target network to the first packet header. It is added when the access network device sends and passes through the first N3IWF, and the second packet header is the return data sent from the first access network device to the second access network device and passes through all Added when the first N3IWF is mentioned.
  • the source network is an NPN network
  • the target network is a PLMN network
  • the source network is a PLMN network
  • the target network is an NPN network
  • an access network device including a unit for implementing the method according to any one of the first aspect or the second aspect.
  • an AMF including a unit for implementing the method described in any one of the third aspect.
  • an access network device including a processor and a memory, and the processor executes code in the memory to execute the unit of the method according to any one of the first aspect or the second aspect.
  • an AMF including a processor and a memory, and the processor executes the code in the memory to execute the unit of the method according to any one of the third aspect.
  • a readable storage medium includes instructions that, when the instructions run on a device, cause the device to execute the method according to any one of the first, second, or third aspects.
  • a program product is provided, and when the program product is read and executed by a device, the method according to any one of the first aspect, the second aspect, or the third aspect will be executed.
  • Figure 1 is a schematic structural diagram of an independent NPN networking mode provided by this application.
  • FIG. 2 is a schematic diagram of the transmission channel between the access network device 1 and DN2 when the terminal device involved in this application is located in the coverage area of the NPN network;
  • FIG. 3 is a schematic diagram of the transmission channel between the access network device 2 and DN2 when the terminal device involved in the present application is located in the coverage area of the PLMN network;
  • FIG. 4 is a schematic flowchart of a method for establishing a data return path provided by this application
  • FIG. 5 is a schematic diagram of the first NPN segment data return channel of the access network device 1 to UPF1 provided by this application;
  • FIG. 6 is a schematic flowchart of a method for transmitting back data information provided by the present application.
  • FIG. 7 is a schematic diagram of a terminal device in this application sending back data information to AMF1 through an N1 interface;
  • FIG. 8 is a schematic flowchart of a method for transmitting back data information provided by the present application.
  • FIG. 9 is a schematic diagram of the transmission process of returning data information in this application.
  • FIG. 10 is a schematic diagram of two channels for transmitting backhaul data and new data between the access network device 2 and the terminal device in this application;
  • FIG. 11 is a schematic diagram of only one channel for transmitting backhaul data and new data between the access network device 2 and the terminal device in this application;
  • FIG. 12 is an interaction diagram of the data backhaul method of the target network according to the first embodiment of this application.
  • FIG. 13 is an interaction diagram of the second method for data backhaul of the target network proposed by this application.
  • FIG. 14 is an interaction diagram of the third method for data backhaul of the target network proposed by this application.
  • Figure 16 is a schematic structural diagram of a device provided by the present application.
  • Fig. 17 is a schematic structural diagram of a network device provided by the present application.
  • the NPN network includes an independent non-3AGPP access network, a core network (core network, CN) 1 and a data network 1.
  • the non-3AGPP access network may include an access device 1, and the access network device 1 may be an access network device of a 3AGPP access network.
  • CN1 may include authentication management function 1 (Authentication Management Function, AMF), service management function 1 (service management facility, SMF), user plane function 1 (User Plane Function, UPF) and other network elements.
  • the PLMN network also includes independent 3GPP access network, core network 2 and data network 2.
  • the 3GPP access network may include an access network device 2, and the access network device 2 may be an access network device of the 3GPP access network.
  • the core network 2 may include network elements such as AMF2, SMF2, and UPF2.
  • Data can be transmitted between CN1 of the NPN network and CN2 of the PLMN network through a non-3GPP interworking function (Non-3GPP interworking function, N3IWF) network.
  • N3IWF 1 of the NPN network is connected to UPF1 of the NPN network on the one hand, and connected to the data network 2 of the PLMN network on the other hand.
  • N3IWF2 of the PLMN network is connected to UPF2 of the PLMN network on one side, and to the data network 1 of the NPN network on the other hand.
  • the network elements involved in the independent networking mode of NPN include access network equipment, AMF, UPF, SMF, and N3IWF.
  • the terminal device may be an entity on the user side for receiving or transmitting signals, such as a new generation UE (gUE).
  • Terminal equipment can also be called terminal equipment (User Equipment, UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile equipment, user terminal, terminal, wireless communication equipment, user Agent or user device.
  • the terminal device can be a station (STAION, ST) in a wireless local area network (Wireless Local Area Networks, WLAN), a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, and a wireless local loop (Wireless Local).
  • WLAN wireless Local Area Networks
  • SIP Session Initiation Protocol
  • the terminal device may also be a wearable device. Wearable devices can also be called wearable smart devices.
  • wearable device is a portable device that is directly worn on the body or integrated into the user's clothes or accessories.
  • Wearable devices are not only a hardware device, but also realize powerful functions through software support, data interaction, and cloud interaction.
  • wearable smart devices include full-featured, large-sized, complete or partial functions that can be achieved without relying on smart phones, such as smart watches or smart glasses, and only focus on a certain type of application function, and need to cooperate with other devices such as smart phones. Use, such as various smart bracelets and smart jewelry for physical sign monitoring.
  • the access network device may be an entity on the network side for transmitting or receiving signals, such as a new generation NodeB (gNodeB).
  • the access network device can also be a device used to communicate with mobile devices.
  • the access network device can be an access point (AP) in a wireless local area network (Wireless LAN, WLAN), and a global system for mobile communication.
  • AP access point
  • the base station in Mobile Communication (GSM) or Code Division Multiple Access (CDMA), or the base station (Wideband Code Division Multiple Access, WCDMA) in Wideband Code Division Multiple Access (WCDMA) NodeB, NB), or evolutionary base station (Evolutional Node B, eNB or eNodeB) in Long Term Evolution (LTE), or relay station or access point, or in-vehicle equipment, wearable equipment, and future 5G networks Or the network equipment in the future evolution of the Public Land Mobile Network (PLMN) network, or the gNodeB in the NR system.
  • GSM Mobile Communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • NodeB NodeB
  • evolutionary base station Evolutional Node B, eNB or eNodeB
  • LTE Long Term Evolution
  • PLMN Public Land Mobile Network
  • the access network equipment provides services for the cell, and the terminal equipment communicates with the network equipment through the transmission resources (for example, frequency domain resources, or spectrum resources) used by the cell.
  • the cell may be The cell corresponding to the network device (such as the base station).
  • the cell can belong to a macro base station or a base station corresponding to a small cell.
  • the small cell here can include: metro cell, micro cell, Pico cells, femto cells, etc. These small cells have the characteristics of small coverage and low transmit power, and are suitable for providing high-rate data transmission services.
  • AMF is used for the access authority and mobility management of terminal equipment.
  • AMF can support the following functions: termination of RAN CP interface (N2), termination of NAS (N1), NAS encryption and integrity protection, registration management, connection management, reachability management, liquidity management, legal interception (applicable to AMF events and LI system interface), provide transmission for SM messages between UE and SMF, transparent proxy for routing SM messages, access authentication, access authorization, provide SMS message transmission between UE and SMSF, security anchor Function (SEAF), location service management of supervisory services, transmission of location service messages between UE and LMF and between RAN and LMF, EPS bearer ID allocation for interworking with EPS, UE movement event notification.
  • SEAF security anchor Function
  • AMF can also support the following functions: support N2 interface and N3IWF, on this interface, some information defined by 3GPP access (for example, 3GPP cell identity) and procedures (for example, related to mobile) may not be applied, and The application does not apply to the non-3GPP access specific information of 3GPP access, the support of NAS signaling through the UE on the N3IWF, and some procedures supported by the NAS signaling on the 3GPP access may not be applicable to untrusted non-3GPP (such as search Call) access, support the authentication of UEs connected through N3IWF, manage the mobility of UEs connected through non-3GPP access or through 3GPP and non-3GPP simultaneous connections, authentication and separate security context status, support for coordinated RM management context, This context is valid for 3GPP and non-3GPP access, supports dedicated CM management context for UE, is used to connect through non-3GPP access, SMF can provide service continuity, uninterrupted user experience of service, including IP address and/or anchor Point changes.
  • UPF can be associated with the UPF protocol data unit (Protocol Data Unit, PDU) session can be served by the radio access network through the N3 interface between the radio access network and the UPF, without the need to add or remove a new UPF in between /Reassign UPF.
  • PDU Protocol Data Unit
  • UPF can support the following functions: anchor points for intra-RAT/inter-RAT mobility (when applicable), conversation points for interconnection of external PDUs with data networks, packet routing and forwarding (for example, supporting uplink classifiers to transfer traffic Instances of flow routing to the data network, supporting branch points to support multi-homed PDU sessions), packet inspection (for example, application detection based on service data flow templates and optional PFD received from SMF), user plane part of policy rule enforcement , Such as gating, redirection, traffic diversion, lawful interception (UP collection), traffic usage report, user plane QoS processing, such as UL/DL rate implementation, reflection QoS marking in DL, uplink traffic verification (SDF to QoS traffic mapping), transmission-level packet marking in uplink and downlink, downlink packet buffering and downlink data notification triggering, sending and forwarding one or more "end marks" to the source NG-RAN node, ARP proxy And/or IPv6 Neighbor Solicitation Proxying and UPF of Ethernet PDU respond to ARP and/
  • SMF provides service continuity, uninterrupted user experience of the service, including changes in IP addresses and/or anchor points.
  • the functions of SMF include: session management, such as session establishment, modification and release, including tunnel maintenance between UPF and AN node, UE IP address allocation and management (including optional authorization), DHCPv4 (server and client) and DHCPv6 (Server and Client) function, ARP proxy and/or IPv6 Neighbor Solicitation Proxying of Ethernet PDU, SMF responds to ARP and/or IPv6 neighbor requests, selection and control by providing the MAC address corresponding to the IP address sent in the request UP functions, including controlling UPF proxy ARP or IPv6 neighbor discovery, or forwarding all ARP/IPv6 neighbor solicitation traffic to SMF, used for Ethernet PDU sessions, configuring UPF flow control, routing traffic to the correct destination, and terminating the interface
  • lawful interception interface for SM events and LI system
  • charging data collection and supporting charging interface including charging data collection and supporting charging interface, control and coordination of UPF charging data collection
  • the terminal device When the terminal device is located in the coverage area of the NPN network, the terminal device can access the access network device 1 in the NPN network. When the terminal device is located in the coverage area of the PLMN network, the terminal device can access the access network device 2 in the PLMN network. Therefore, when the terminal device moves from the range covered by the NPN network to the range covered by the PLMN network, the terminal device will move from the access network device 1 in the NPN network to the access network device 2 in the PLMN network. Conversely, the terminal device can also move from the access network device 2 in the PLMN network to the access network device 1 in the NPN network.
  • the network where the terminal device is located before moving is an NPN network
  • the network where the terminal device is located after moving is a PLMN network as an example for description.
  • a first transmission channel can be established between the access network device 1 and DN2 for the access network device 1 to transmit PLMN data through the first transmission channel.
  • To DN2, or DN2 transmits the PLMN data to the access network device 1 through the first transmission channel.
  • the first transmission channel can use PLMN PDU session resources.
  • the first transmission channel can be PLMN PDU session resources through access network equipment 1, UPF1, DN1, N3IWF2, UPF2, and DN2 (as shown in Figure 2). The bold dashed line shows).
  • a second transmission channel can be established between the access network device 2 and DN2, so that the access network device 2 can transmit PLMN data through the second transmission channel. Transmit to DN2, or DN2 transmits the PLMN data to the access network device 2 through the second transmission channel.
  • the second transmission channel can use PLMN PDU session resources.
  • the second transmission channel can be PLMN PDU session resources through access network equipment 2, UPF2, and DN2 (as shown by the bold dotted line in Figure 3). ).
  • the terminal device When the terminal device moves from the range covered by the NPN network to the range covered by the PLMN network, the terminal device switches from the access network device 1 to the access network device 2. If D2 has sent the PLMN data to the access network device 1, but the terminal device is connected If the network access device 1 has not sent the PLMN data to the terminal device, the access network device 1 may not be able to send the received PLMN data to the terminal device. In the same way, when the terminal device moves from the coverage of the NPN network to the coverage of the PLMN network, the terminal device switches from the access network device 1 to the access network device 2. If the terminal device is sending PLMN data to the access network device 1. The PLMN data received by the access network device 1 may be discontinuous. At this time, the access network device 1 cannot send the discontinuous PLMN data to D2.
  • the PLMN data that has been uplinked to the access network device 2 in the uplink direction and is ready to be uplinked to CN2 and the PLMN data that has been downlinked to the access network device 2 in the downlink direction and is ready to be downlinked to the terminal device are collectively called new data.
  • the movement of the terminal device from the access network device 2 in the PLMN network to the access network device 1 in the NPN network is also similar, and will not be repeated here.
  • the scenario where the UE moves across networks from the source network to the target network is not limited.
  • the UE may move during the inter-network cell reselection process, or the UE may move during the inter-network cell handover process.
  • the movement of the UE from the source network to the target network can also be alternatively described as: the UE reselects from the source network to the target network, the UE switches from the source network to the target network, and the UE accesses from the source network to the target network.
  • the cell reselection involved in this patent is different from the traditional idle state UE performing cell reselection, but the UE in the connected state autonomously decides to perform the inter-network cell "handover" instead of the cell "handover” controlled by the network side. That is, it is not completely consistent with the cell reselection and handover procedures described in the traditional standard, and can also be other terms, such as self-handover across networks.
  • FIG. 4 is a schematic flowchart of a method for establishing a data return path in this embodiment. The method includes the following steps:
  • S101 The terminal device sends a movement notification to AMF1.
  • AMF1 receives the mobile notification sent by the terminal device.
  • the move notification is used to notify the AMF1 that the terminal device has moved or will move from the access network device 1 in the NPN network to the access network device 2 in the PLMN network.
  • the movement notification carries the reason value, the type of movement, the position information before the movement, the position information after the movement, the QoS Flow Identifier (QFI), the DRB ID (DRB ID), and the mapping list of DRB and QoS flow One or more of.
  • the reason value is the reason for the terminal device to send notification information.
  • the mobility type is when a user moves from a cell in one network to a cell in another network, for example, from NPN to PLMN, using SNPN, NPN, PLMN, SNPNtoPLMN, PLMNtoSNPN, NPNtoPLMN, PLMNtoNPN, PNI-NPNtoPLMN, PLMNtoPNI-NPN, SNPNtoSNPN, Non-3GPPtoPLMN, PLMNtoNon-3GPP, Non-3GPPtoNon-3GPP, or InterNetwork-mobility logo.
  • the location information before the movement is the location information of the NPN network where the terminal device was located before the movement, for example, the NPN network identifier (e.g., using the Public Land Mobile Network identifier (PLMN ID) and Network identifier, NID) joint identification of independently deployed NPN networks), tracking area code (tracking area code, TAC), NG-RAN cell ID, terminal equipment identification (UE ID), NG-RAN node ID, and address information of the connected N3IWF ( For example, N3IWF IP) and so on.
  • the NPN network identifier e.g., using the Public Land Mobile Network identifier (PLMN ID) and Network identifier, NID
  • tracking area code tracking area code
  • TAC tracking area code
  • NG-RAN cell ID NG-RAN cell ID
  • UE ID terminal equipment identification
  • NG-RAN node ID e.g., NG-RAN node ID
  • address information of the connected N3IWF e.g., N3IWF
  • the position information after the movement is the position information of the PLMN network where the terminal device is moved, for example, PLMN network identification (Public Land Mobile Network identifier, PLMN ID), tracking area code (TAC), NG-RAN cell ID, terminal equipment identification (UE ID), NG-RAN node ID, connected N3IWF address information (for example, N3IWF IP), etc.
  • PLMN network identification Public Land Mobile Network identifier, PLMN ID
  • TAC tracking area code
  • NG-RAN cell ID terminal equipment identification
  • UE ID terminal equipment identification
  • NG-RAN node ID NG-RAN node ID
  • connected N3IWF address information for example, N3IWF IP
  • the terminal equipment identification can be C-RNTI, I-RATI, NG-RAN node UE NGAP ID, and so on.
  • AMF1 sends a backhaul channel establishment notification to UPF1 through SMF1 according to the mobile notification.
  • UPF1 receives the backhaul channel establishment notification sent by AMF1 through SMF1.
  • the backhaul channel establishment notification is used to notify the UPF1 to establish the first NPN segment data backhaul channel between the access network device 1 and the UPF1.
  • the notification of establishment of the backhaul channel may also carry the address information of the N3IWF1 that the terminal device is connected to after moving, and the PDU Session ID, QFI and DRB IDs that require data backhaul, etc.
  • AMF1 determines that it needs to establish a data backhaul path from access network device 1 to access network device 2. Therefore, AMF1 sends a backhaul channel to UPF1 through SMF1 Create notification.
  • UPF1 configures the transmission network layer information of the first NPN segment data return channel for the return data according to the return channel establishment notification.
  • the transmission network layer information is used to configure parameters for the first NPN segment data return channel.
  • the transmission network layer information may include one or more of uplink forwarding user plane transmission network layer information (UL Forwarding UP TNL Information) and downlink forwarding user plane transmission network layer information (DL Forwarding UP TNL Information).
  • the forwarding user plane transport network layer information may include the upstream transport layer address (for example, port IP address) and the upstream GTP tunnel port identifier (such as GTP-TEID, GTP-Tunnel Endpoint Identifier, etc.).
  • the downstream forwarding user plane transport network layer may include a downstream transport layer address (for example, port IP address) and a downstream GTP tunnel port identifier (for example, GTP-TEID, GTP-Tunnel Endpoint Identifier, etc.).
  • a downstream transport layer address for example, port IP address
  • a downstream GTP tunnel port identifier for example, GTP-TEID, GTP-Tunnel Endpoint Identifier, etc.
  • UPF1 sends the transmission network layer information to AMF1.
  • AMF1 receives the transmission network layer information sent by UPF1.
  • AMF1 sends the transmission network layer information to the access network device 1.
  • the access network device 1 receives the transmission network layer information sent by the AMF1.
  • the access network device 1 and UPF1 in the PLMN network establish the first NPN segment data return channel from the access network device 1 to the UPF1.
  • the establishment of the first data return channel may be triggered by the terminal device, or it may be triggered by AMF1.
  • the terminal device triggering means that the terminal device sends NAS information to AMF1 to request the establishment of the first data return channel.
  • AMF1 triggering means that AMF1 establishes the first data return channel based on the content in the mobile notification.
  • the AMF 1 has notified the UPF1 of the address information of the N3IWF 1 in S102, and a second data return channel has been established between UPF1 and N3IWF1.
  • the first PLMN segment data return channel can be carried by the established NPN PDU session resource, or it can be an established PLMN segment data return channel dedicated to data return (dedicated data return Transmission channel). It is understandable that when the NPN PDU session resource is used for the first PLMN segment data return channel, a data transmission channel from the terminal device to DN2 is actually established. Therefore, the access network device 2 can use the NPN PDU session The resource communicates with the terminal device. When the first PLMN segment data return channel uses a dedicated data return channel, the data return channel from the access network device 2 to the UPF1 is actually established, and the access network device 2 does not It can communicate with terminal equipment through the dedicated data return channel.
  • the first PLMN segment data return channel when the first PLMN segment data return channel uses NPN PDU session resources, the first PLMN segment data return channel can be established after the terminal device successfully moves to the PLMN network, that is, after the terminal device moves to the PLMN network Send NAS information to AMF1 to request the establishment of NPN PDU session resources, the request information carries the NPN PDU session identifier (PDU Session ID), the PLMN PDU session identifier list, the return data information corresponding to the PLMN PDU session, the data transmission sequence information, Or the reason value of NPN PDU session resource establishment.
  • PDU Session ID NPN PDU session ID
  • the PLMN PDU session identifier list the return data information corresponding to the PLMN PDU session
  • the data transmission sequence information Or the reason value of NPN PDU session resource establishment.
  • the NPN PDU session identifier and the PLMN PDU session identifier in the PLMN PDU session identifier list are used to indicate that the established NPN PDU session resource can be used to return corresponding PLMN PDU session data. It should be understood that NPN PDU session resources may or may not be used to transmit corresponding NPN PDU session data.
  • the returned data information corresponding to the PLMN PDU session includes: PDU session identifier, QoS flow identifier, DRB identifier, or a mapping list between DRB and QoS flow.
  • the data transmission sequence information is used to indicate the data transmission sequence of the NPN PDU session and PLMN PDU session.
  • the sequence of the NPN PDU session identifier and the PLMN PDU session identifier is used to indicate the sequence of transmitting corresponding data. After the data transmission is over, an end marker is added to the end of the data, and then the data of another PDU session is transmitted.
  • the reason value is used to indicate the reason why the terminal device requests to establish an NPN PDU session, for example, using SNPN, NPN, PLMN, SNPNtoPLMN, PLMNtoSNPN, NPNtoPLMN, PLMNtoNPN, PNI-NPNtoPLMN, PLMNtoPNI-NPN, SNPNtoSNPN, Non-3GPPtoPLMN, PLMNtoNon- The 3GPP, Non-3GPPtoNon-3GPP, or InterNetwork-mobility identification reason value is used to indicate that the terminal device needs to establish NPN PDU session resources to maintain business continuity when moving across networks.
  • the data return path established between the access network device 1 and the access network device 2 is the sum of the first NPN segment data return channel and the first PLMN segment data return channel, that is, the access network device 1 passes through The first NPN segment data return channel and the first PLMN segment data return channel can transmit the return data to the access network device 2.
  • the access network device 1 can send the return data to UPF1 through the first NPN segment data return channel, and then UPF1 passes The first PLMN segment data return channel sends the return data to the access network device 2.
  • the new data below mainly refers to this part of the data may reach the access network device earlier than the return data. Therefore, in order to ensure that the return data is transmitted to the connection After accessing the network device 2, it can be correctly uplinked to DN2 or downlinked to the terminal device by the access network device 2.
  • the terminal device also needs to send back data information to the access network device 1 and the access network device 2, respectively, to Ensure that the backhaul data information between the access network device 1 and the access network device 2 is unified, and enable the access network device 2 to correctly upload the backhaul data and new data to DN2 or downlink according to the backhaul data information To the terminal device.
  • FIG. 6 is a schematic flowchart of a method for transmitting back data information provided by the present application.
  • the method for transmitting back data information includes the following steps:
  • the terminal device sends back data information to the AMF1 through the N1 interface.
  • AMF1 receives the backhaul data information sent by the terminal device through the N1 interface.
  • the N1 interface is the interface established by the terminal equipment with the AMF1 through the access network equipment 2, UPF2, N3IWF1 and other network elements.
  • the return data information carries one or more of the following: NPN PDU session identifier (PDU Session ID), PLMN PDU session identifier list, PLMN PDU session return data information, and data transmission sequence Information, or the reason value of NPN PDU session resource establishment.
  • NPN PDU session identifier and the PLMN PDU session identifier in the PLMN PDU session identifier list are used to indicate that the established NPN PDU session resource can be used to return corresponding PLMN PDU session data. It should be understood that NPN PDU session resources may or may not be used to transmit corresponding NPN PDU session data.
  • the returned data information of the PLMN PDU session includes one or more of the following: PDU session identifier, QoS flow identifier, DRB identifier, or a mapping list between DRB and QoS flow.
  • the backhaul data information of the PLMN PDU session may also include the need to carry the data sent in the DRB to ensure lossless movement, for example, carry the serial number of the uplink PDCP-SN packet data convergence protocol service data unit (Packet Data Convergence Protocol Sequence Number, PDCP-SN) and HFN receiver status information (uplink PDCP-SN and HFN receiver status) and downlink PDCP SN and HFN transmitter status (downlink PDCP SN and HFN transmitter status) information, etc. Wait.
  • PDCP-SN Packet Data Convergence Protocol Sequence Number
  • HFN receiver status information uplink PDCP-SN and HFN receiver status
  • downlink PDCP SN and HFN transmitter status downlink PDCP SN and HFN transmitter status
  • the status information may include one or more of the cell UL/DL COUNT Value, Transmit Status of UL PDCP SDUs, Receive Status of DL PDCP SDUs, and so on.
  • Transmit Status of UL PDCP SDUs are used to reflect whether the corresponding UL PDCP has been successfully issued, such as 0 means that the corresponding PDCP has not been sent successfully, and 1 means that the corresponding PDCP has been sent successfully.
  • Receive Status of DL PDCP SDUs are used to reflect whether the corresponding DL PDCP has been successfully received. For example, 0 means that the corresponding PDCP has not been successfully received, and 1 means that the corresponding PDCP has been successfully received.
  • the data transmission sequence information is used to indicate the sequence of transmitting the data of the backhauled PLMN PDU session and the data of the newly arrived NPN PDU session in the NPN PDU session resource. For example, use the sequence of NPN PDU session ID and PLMN PDU session ID or the sequence list of NPN PDU session ID and PLMN PDU session ID to indicate the sequence of transmitting the corresponding data. After the data transmission of a PDU session is over, add it at the end of the data End marker (end marker), and then continue to transmit data of another PDU session.
  • end marker end marker
  • the reason value is used to indicate the reason why the terminal device requests to establish an NPN PDU session, for example, using SNPN, NPN, PLMN, SNPNtoPLMN, PLMNtoSNPN, NPNtoPLMN, PLMNtoNPN, PNI-NPNtoPLMN, PLMNtoPNI-NPN, SNPNtoSNPN, Non-3GPPtoPLMN, PLMNtoNon- The 3GPP, Non-3GPPtoNon-3GPP, or InterNetwork-mobility identification reason value is used to indicate that the terminal device needs to establish NPN PDU session resources to maintain business continuity when moving across networks.
  • the terminal device obtains locally stored backhaul data information from the local, and sends backhaul data information to AMF1 through the N1 interface.
  • the AMF1 sends the return data information to the access network device 1.
  • the access network device 1 receives the backhaul data information sent by the AMF1.
  • the terminal device moves from the access network device 1 to the access network device 2, the connection between the terminal device and the access network device 1 has been disconnected, and the connection between the terminal device and the access network device 1 is no longer possible.
  • Data transmission is performed normally, the connection between the terminal device and the access network device 2 has been established, and the data transmission between the terminal device and the access network device 2 can be performed normally.
  • the access network device 1 and the access network device 2 are in the same network type (for example, when both are located in the PLMN network), the access network device 1 and the access network device 2 can have a directly connected Xn interface At this time, the access network device 1 and the access network device 2 can communicate directly, but here, the access network device 1 and the access network device 2 are located in two different network types (NPN network and PLMN network). ), therefore, the access network device 1 and the access network device 2 cannot communicate directly.
  • the terminal device cannot directly communicate with the access network device 1, so an N1 interface can be established between the terminal device and AMF1, and the terminal device can send back data information to AMF1 through the N1 interface, and then AMF1 will return data information Sent to access network device 1.
  • the terminal device sends the return data information to the access network device 2.
  • the access network device 2 receives the backhaul data information sent by the terminal device.
  • the terminal device may also send backhaul data information to the access network device 2.
  • the above-mentioned information can be carried in the returned data information.
  • the terminal device since the terminal device has moved to the access network device 2, the terminal device can directly send the backhaul data information to the access network device 2.
  • the terminal device directly sends the return data information to the access network device 2 as an example for description, but the terminal device may not directly send the return data information to the access network device 2. If yes, the terminal device first sends the return data information to AMF2 through the NAS message, and AMF2 then forwards the return data information to the access network device 2.
  • FIG. 8 is a schematic flowchart of a method for transmitting back data information provided by the present application.
  • the method for transmitting back data information includes the following steps:
  • the terminal device Before the terminal device moves from the access network device 1 to the access network device 2, the terminal device sends a handover preparation notification to the access network device 1. Correspondingly, the access network device 1 receives the handover preparation notification sent by the terminal device.
  • the access network device 1 sends back data information to the terminal device.
  • the terminal device receives the backhaul data information sent by the access network device 1.
  • the return data information carries one or more of the following: NPN PDU session identifier (PDU Session ID), PLMN PDU session identifier list, PLMN PDU session return data information, and data transmission sequence Information, or the reason value of NPN PDU session resource establishment.
  • NPN PDU session identifier and the PLMN PDU session identifier in the PLMN PDU session identifier list are used to indicate that the established NPN PDU session resource can be used to return corresponding PLMN PDU session data. It should be understood that NPN PDU session resources may or may not be used to transmit corresponding NPN PDU session data.
  • the returned data information of the PLMN PDU session includes one or more of the following: PDU session identifier, QoS flow identifier, DRB identifier, or a mapping list between DRB and QoS flow.
  • the backhaul data information of the PLMN PDU session may also include the need to carry the data sent in the DRB to ensure lossless movement, for example, carry the serial number of the uplink PDCP-SN packet data convergence protocol service data unit (Packet Data Convergence Protocol Sequence Number, PDCP-SN) and HFN receiver status information (uplink PDCP-SN and HFN receiver status) and downlink PDCP-SN and HFN transmitter status (downlink PDCP SN and HFN transmitter status) information and many more.
  • PDCP-SN Packet Data Convergence Protocol Sequence Number
  • HFN receiver status information uplink PDCP-SN and HFN receiver status
  • downlink PDCP-SN and HFN transmitter status downlink PDCP SN and HFN transmitter status
  • the status information may include one or more of the cell UL/DL COUNT Value, Transmit Status of UL PDCP SDUs, Receive Status of DL PDCP SDUs, and so on.
  • Transmit Status of UL PDCP SDUs are used to reflect whether the corresponding UL PDCP has been successfully issued, such as 0 means that the corresponding PDCP has not been sent successfully, and 1 means that the corresponding PDCP has been sent successfully.
  • Receive Status of DL PDCP SDUs are used to reflect whether the corresponding DL PDCP has been successfully received. For example, 0 means that the corresponding PDCP has not been successfully received, and 1 means that the corresponding PDCP has been successfully received.
  • the data transmission sequence information is used to indicate the sequence of transmitting the data of the backhauled PLMN PDU session and the data of the newly arrived NPN PDU session in the NPN PDU session resource. For example, use the sequence of NPN PDU session ID and PLMN PDU session ID or the sequence list of NPN PDU session ID and PLMN PDU session ID to indicate the sequence of transmitting the corresponding data.
  • the reason value is used to indicate the reason why the terminal device requests to establish an NPN PDU session, for example, using SNPN, NPN, PLMN, SNPNtoPLMN, PLMNtoSNPN, NPNtoPLMN, PLMNtoNPN, PNI-NPNtoPLMN, PLMNtoPNI-NPN, SNPNtoSNPN, Non-3GPPtoPLMN, PLMNtoNon- The 3GPP, Non-3GPPtoNon-3GPP, or InterNetwork-mobility identification reason value is used to indicate that the terminal device needs to establish NPN PDU session resources to maintain business continuity when moving across networks.
  • the access network device 1 obtains locally stored backhaul data information from the local, and sends backhaul data information to the terminal device through a wireless interface.
  • S302 As shown in FIG. 9, after the terminal device moves from the access network device 1 to the access network device 2, the terminal device sends back data information to the access network device 2. Correspondingly, the access network device 2 receives the backhaul data information sent by the terminal device.
  • FIGS. 6 and 8 are only two examples of sending back data information to the access network device 1 and the access network device 2, and should not constitute a specific limitation.
  • the terminal device moves to the second connection. After the device is connected to the network, it sends mobile notification information to AMF1, and AMF1 asks whether the access network device 1 has data to return. If the access network device 1 needs to return data, the access network device 1 sends the data return information to AMF1 and AMF1 then send the data return information to the terminal device and UPF1 respectively, or AMF1 sends the data return information to the terminal device and N3IWF1 respectively, and the terminal device sends the data return information to the access network device 2.
  • the terminal device before the terminal device moves from the access network device 1 to the access network device 2, the terminal device sends a movement notification to the access network device 1 to the access network device 1.
  • the access network device 1 sends the return data information to the terminal device, and the access network device 1 sends the return data information to AMF1.
  • the terminal device also sends the backhaul data information to the access network device 2, and AMF1 can also send the backhaul data information to UPF1 or N3IWF1.
  • the channel used to transmit backhaul data and new data between the access network device 2 and the terminal device includes at least the following two situations:
  • the first PLMN segment data return channel is an NPN PDU session resource.
  • the access network device 2 can use Figure 5
  • the first PLMN segment data return channel shown ie NPN PDU session resource
  • the access network device 2 can use the second transmission channel shown in Figure 3 (ie PLMN PDU session resource) Communicate with terminal equipment.
  • NPN PDU session can be indicated by one or more of the following identifiers: NPN PDU Session ID, NPN DRB ID, QFI, etc.
  • PLMN The PDU session can be indicated by one or more of the following identifiers: PLMN PDU Session ID, PLMN DRB ID, PLMN QFI, etc.
  • the access network device 2 needs to inform the terminal device of the mapping relationship and purpose between the PLMN PDU session resource and the PLMN PDU session to be returned, so as to inform the terminal device to transmit on one or more PLMN PDU session resources Return data of one or more PLMN PDU sessions.
  • the first PLMN segment data return channel is a dedicated data return channel.
  • the access network device 2 can use the The second transmission channel (ie, PLMN PDU session resource) communicates with the terminal device.
  • the granularity of backhaul data transmitted between the access network device 2 and the terminal device includes at least the following two methods:
  • the granularity of the returned data is the PDU session granularity.
  • the information to be returned by the access network device 2 does not contain PDCP-SN and HFN information, in order to ensure the transmission of backhaul between the access network device 2 and the terminal device
  • the sequence of the data and the new data is correct, and the access network device 2 needs to transmit in the sequence.
  • the access network device 2 needs to return The transmitted data is sent to the terminal device, and then the access network device 2 sends the new data to the terminal device, thereby ensuring that the terminal device receives the return data and the transmission sequence of the new data is correct.
  • the granularity of the returned data and new data is the DRB granularity.
  • the information to be returned by the access network device 2 does not contain PDCP-SN and HFN information, and the access network device 2 can return according to the PDCP-SN and HFN information pair
  • the data and the new data are reordered. Therefore, the backhaul data and new data transmitted between the access network device 2 and the terminal device may be transmitted out of order. For example, although the backhaul data is generated before the new data is generated (the backhaul data is the data generated before the terminal device moves, and the new data is the data generated after the terminal device moves), the access network device 2 can receive the data first.
  • the received new data is sent to the terminal device, and then the returned data received later is sent to the terminal device.
  • the terminal device receives the new data and the returned data, it reorders the data according to the sequence mark (for example, PDCP SN number).
  • the access network device 2 receives the return data and new data, it needs to sort the return data and the new data correctly, and mark the order according to the received PDCP-SN and HFN information (for example, PDCP SN number).
  • the access network device 2 can transmit backhaul data and new data to the terminal device according to the backhaul data information, and the access network device 2 can transmit backhaul data to the equipment of the PLMN core network (for example, UPF2) according to the backhaul data information. And new data.
  • the access network device 2 transmits the return data and new data to the terminal device according to the return data information, and the access network device 2 can
  • the methods of transmitting back data and new data to the equipment of the PLMN core network (for example, UPF2) according to the back data information include at least the following:
  • a PLMN PDU session can be a PDU session established between a terminal device and the PLMN network
  • a PNN PDU session can be a PDU session established between a terminal device and the NPN network.
  • PLMN PDU session and PNN PDU Conversation are abbreviated as PLMN PDU session and PNN PDU Conversation.
  • the first PLMN segment data return channel is an NPN PDU session resource
  • the granularity of the data returned is the PDU session granularity.
  • the access network device 2 informs the terminal device of the mapping relationship and purpose between the NPN PDU session resource and the PLMN PDU session to be returned, so as to inform the terminal device that one or more PLMNs are to be transmitted on one or more NPN PDU session resources
  • the return data of the PDU session where the NPN PDU session can be indicated by one or more of the following identifiers: NPN PDU Session ID, NPN DRB ID, QFI, etc.
  • the PLMN PDU session can be indicated by one or more of the following identifiers: PLMN PDU Session ID, PLMN DRB ID, PLMN QFI, etc.
  • the access network device 2 first sends the PLMN PDU session data to be transmitted back from the NPN PDU session resource to the terminal device through the NPN PDU session resource, and then the newly arrived data received from the PLMN PDU session resource
  • the PLMN PDU session data is sent to the terminal device through the PLMN PDU session resource.
  • the terminal device sends the PLMN PDU session data to be returned and the newly arrived PLMN PDU session data to the upper layer application of the terminal device in the above order, and the upper layer application parses the PLMN PDU session data to be returned and the newly arrived PLMN PDU session data.
  • the access network device 2 will use any one of the NPN PDU session resource and the PLMN PDU session resource (ie, air interface DRB resource) to return the PLMN PDU session data to be transmitted and the newly arrived PLMN PDU session data in the above order It is sent to the high-level application of the terminal device successively, and the high-level application parses out the PLMN PDU session data to be returned and the newly arrived PLMN PDU session data. Wherein, the access network device 2 sends a notification to the terminal device before sending the PLMN PDU session data to be returned and the newly arrived PLMN PDU session data.
  • the NPN PDU session resource and the PLMN PDU session resource ie, air interface DRB resource
  • the sending notification is used to indicate the type of session resource carried by the sent PLMN PDU session data to be returned and the newly arrived PLMN PDU session data
  • the resource type is any of the NPN PDU session resource and the PLMN PDU session resource.
  • the resource type can be identified by PLMN PDU Session ID, PLMN DRB ID, NPN PDU Session ID, or NPN DRB ID.
  • the access network device 2 may also send the PLMN PDU session data to be returned and the newly arrived PLMN PDU session data through the default resource type, and the default resource type is NPN PDU session resource or PLMN PDU session resource.
  • the transmission mode of the user plane data in the uplink direction is similar to that of the user plane data in the downlink direction.
  • the access network device 2 may inform the terminal device of the data transmission sequence information.
  • the data transmission sequence information is used to refer to the PLMN PDU session data that is transmitted back in the PDU session resource. The sequence of the data newly arrived in the PLMN PDU session or the data of the NPN PDU session.
  • sequence of NPN PDU session ID and PLMN PDU session ID or the sequence list of NPN PDU session ID and PLMN PDU session ID to indicate the sequence of transmitting the corresponding data.
  • the first PLMN segment data return channel is a PLMN segment data return channel established specifically for data return (dedicated data return channel), and the granularity of the returned data is the PDU session granularity.
  • the access network device 2 first sends the PLMN PDU session data to be returned from the dedicated data return channel to the terminal device through the PLMN PDU session resource, and then the PLMN PDU session resource from the PLMN The newly arrived PLMN PDU session data received in the PLMN is sent to the terminal device through the PLMN PDU session resource.
  • the terminal device sends the PLMN PDU session data to be returned and the newly arrived PLMN PDU session data to the upper layer application of the terminal device in the above order, and the upper layer application parses the PLMN PDU session data to be returned and the newly arrived PLMN PDU session data.
  • the transmission mode of the user plane data in the uplink direction is similar to that of the user plane data in the downlink direction. It only needs to replace the receiving end from the terminal device with the device of the PLMN core network (for example, UPF2).
  • the first PLMN segment data return channel is carried in the NPN PDU session resource, and the granularity of the data returned is the DRB granularity.
  • the access network device 2 performs PDCP numbering, reordering, and transmission on the PLMN PDU session data to be transmitted back received from the NPN PDU session resource and the newly arrived PLMN PDU session data received from the PLMN PDU session resource.
  • any uplink data whose PDCP SN value is lower than the provided UL PDCP SN value should not be transmitted, and the provided DL PDCP SN value should be used as the first downlink data packet to be sent without a PDCP-SN assigned.
  • the PDCP SN value is used to transmit data in order to avoid repeated data transmission.
  • the access network device 2 informs the terminal device of the mapping relationship and purpose between the NPN PDU session resource and the PLMN PDU session to be returned, so as to inform the terminal device of one or more NPN PDU session resources
  • the backhaul data of one or more PLMN PDU sessions are to be transmitted on the above.
  • the NPN PDU session can be indicated by one or more of the following identifiers: NPN PDU Session ID, NPN DRB ID, QFI, etc.
  • PLMN PDU session can be indicated by one of the following Or multiple identifiers to indicate: PLMN PDU Session ID, PLMN DRB ID, PLMN QFI, etc.
  • the access network device 2 sends the PLMN PDU session data to be returned received from the NPN PDU session resource to the terminal device through the NPN DRB session resource, and transmits the newly arrived PLMN PDU session received from the PLMN PDU session resource
  • the data is sent to the terminal device through the PLMN DRB session resource (the two channels of data can be transmitted in no order), and the terminal device sends the PLMN PDU session data to be returned and the newly arrived PLMN PDU session data to the terminal according to the above-mentioned PDCP SN number
  • the high-level application of the device analyzes the PLMN PDU session data to be returned and the newly arrived PLMN PDU session data by the high-level application.
  • the access network device 2 may only use one of the NPN DRB resource and the PLMN DRB resource to receive the PLMN PDU session data to be transmitted back from the NPN PDU session resource and the PLMN PDU session resource received from the PLMN PDU session resource.
  • the newly arrived PLMN PDU session data is sent to the terminal, and the terminal sends the PLMN PDU session data to be returned and the newly arrived PLMN PDU session data to the upper layer according to the above PDCP SN number, and the upper layer parses out the PLMN PDU to be returned Session data and newly arrived PLMN PDU session data.
  • the access network device 2 informs the terminal to only use NPN DRB resources and PLMN DRB resources Which resource is used to send the PLMN PDU session data to be returned and the newly arrived PLMN PDU session data (it can also use which resource to send data by default, so there is no need to explicitly inform the terminal), and the resource type can be determined by PLMN PDU Session ID, PLMN DRB ID, NPN PDU Session ID, or NPN DRB ID identification.
  • the transmission mode of the user plane data in the uplink direction is similar to that of the user plane data in the downlink direction.
  • the access network device 2 passes PLMN PDU The session resource/NPN PDU session resource, not the PLMN DRB session resource/NPN DRB session resource sends the PLMN PDU session data to be returned and the newly arrived PLMN PDU session data to the equipment of the PLMN core network.
  • the first PLMN segment data return channel is a PLMN segment data return channel established specifically for data return (dedicated data return channel), and the granularity of the returned data is the DRB granularity.
  • the access network device 2 performs PDCP numbering, reordering and transmission on the PLMN PDU session data to be transmitted back received from the NPN PDU session resource and the newly arrived PLMN PDU session data received from the PLMN PDU session resource.
  • any uplink data whose PDCP SN value is lower than the provided UL PDCP SN value should not be transmitted, and the provided DL PDCP SN value should be used as the first downlink data packet to be sent without a PDCP-SN assigned.
  • the PDCP SN value is used to transmit data in order to avoid repeated data transmission.
  • the access network device 2 receives the PLMN PDU session data to be returned from the dedicated backhaul channel through the PLMN PDU session resource and the newly arrived PLMN received from the PLMN PDU session resource
  • the PDU session data is sent to the terminal device through the PLMN DRB resource.
  • the terminal device sends the PLMN PDU session data to be returned and the newly arrived PLMN PDU session data to the upper layer of the terminal device according to the above-mentioned PDCP number, which is parsed by the upper layer application of the terminal device
  • the PLMN PDU session data to be returned and the newly arrived PLMN PDU session data is used to transmit data in order to avoid repeated data transmission.
  • the transmission mode of the user plane data in the uplink direction is similar to that of the user plane data in the downlink direction.
  • the access network device 2 passes PLMN PDU The session resource/NPN PDU session resource, not the PLMN DRB session resource/NPN DRB session resource sends the PLMN PDU session data to be returned and the newly arrived PLMN PDU session data to the equipment of the PLMN core network.
  • the access network device 2 Before the access network device 2 can transmit the return data and new data to the terminal device according to the return data information, the access network device 2 can send instruction information to the terminal device, and the instruction information informs the terminal device that the access network device 2 How to send back data and new data to the terminal device.
  • the access network device 2 may not send the instruction information to the terminal device, but send back data and new data to the terminal device in a default manner.
  • the above content separately states the establishment process of the data return channel, the transmission process of the return data information, and the return data return process. In practical applications, these processes are usually intertwined. of.
  • the data return method of the present application will be described below in conjunction with two specific embodiments. Among them, the first embodiment occurs after the terminal device moves from the access network device 1 in the source network to the access network device 2 in the destination network, and the second embodiment occurs when the terminal device connects from the source network. Before the network access device 1 moves to the access network device 2 in the destination network, detailed introductions will be given below.
  • FIG. 12 is an interaction diagram of the data backhaul method of the target network according to the first embodiment of this application.
  • the data backhaul method of this embodiment includes the following steps:
  • the terminal device After the terminal device moves from the access network device 1 in the NPN network to the access network device 2 in the PLMN network, the terminal device establishes an N1 interface with the AMF1.
  • the N1 interface is the interface established by the terminal equipment with the AMF1 through the access network equipment 2, UPF2, N3IWF1 and other network elements.
  • S402 The terminal device sends mobile notification information to AMF1.
  • AMF1 receives the mobile notification information sent by the terminal device.
  • the movement notification information is used to notify the AMF1 terminal device that it has moved from the access network device 1 in the NPN network to the access network device 2 in the PLMN network.
  • the movement notification information carries one or more of the following: cause value, type of movement, position information before movement, and position information after movement.
  • the reason value is the reason why the terminal device sends the notification message, for example, moving across networks.
  • the mobility type is when a user moves from a cell of one network to a cell of another network, for example, from NPN to PLMN.
  • the location information before the movement is the location information of the NPN network where the terminal device was located before the movement, for example, the NPN network identifier (e.g., using the Public Land Mobile Network identifier (PLMN ID) and Network identifier, NID) joint identification of independently deployed NPN networks), tracking area code (tracking area code, TAC), NG-RAN cell ID, terminal equipment identification (UE ID), NG-RAN node ID, and address information of the connected N3IWF ( For example, N3IWF IP) and so on.
  • the NPN network identifier e.g., using the Public Land Mobile Network identifier (PLMN ID) and Network identifier, NID
  • tracking area code tracking area code
  • TAC tracking area code
  • NG-RAN cell ID NG-RAN cell ID
  • UE ID terminal equipment identification
  • NG-RAN node ID e.g., NG-RAN node ID
  • address information of the connected N3IWF e.g., N3IWF
  • the position information after the movement is the position information of the PLMN network where the terminal device is moved, for example, PLMN network identification (Public Land Mobile Network identifier, PLMN ID), tracking area code (TAC), NG-RAN cell ID, terminal equipment identification (UE ID), NG-RAN node ID, connected N3IWF address information (for example, N3IWF IP), etc.
  • PLMN network identification Public Land Mobile Network identifier, PLMN ID
  • TAC tracking area code
  • NG-RAN cell ID terminal equipment identification
  • UE ID terminal equipment identification
  • NG-RAN node ID NG-RAN node ID
  • connected N3IWF address information for example, N3IWF IP
  • the terminal equipment identifier may be C-RNTI, I-RATI, NG-RAN node UE NGAP ID, UE IP address, RAN UE ID, and so on.
  • the reason value is used to indicate the reason for the terminal device to send the notification message.
  • the reason value is used to indicate the reason for the terminal device to send the notification message.
  • the source network and the target network are implemented in different ways, use SNPN, NPN, PLMN, SNPNtoPLMN, PLMNtoSNPN, NPNtoPLMN, PLMNtoNPN, PNI-NPNtoPLMN, PLMNtoPNI -NPN, SNPNtoSNPN, Non-3GPPtoPLMN, PLMNtoNon-3GPP, Non-3GPPtoNon-3GPP, or InterNetwork-mobility identification reason value, used to indicate the notification message sent due to the cross-network movement of the terminal device. It should be understood that the above several possible situations are just examples to illustrate possible manifestations of the cause value, and do not constitute any limitation to the protection scope of this application, and the cause value will not be repeated in this application.
  • S403 The terminal device sends back data information to the AMF1 through the N1 interface.
  • AMF1 receives the backhaul data information sent by the terminal device through the N1 interface.
  • the return data information carries one or more of the following: NPN PDU session identifier (PDU Session ID), PLMN PDU session identifier list, PLMN PDU session return data information, and data transmission sequence Information, or the reason value of NPN PDU session resource establishment.
  • NPN PDU session identifier and the PLMN PDU session identifier in the PLMN PDU session identifier list are used to indicate that the established NPN PDU session resource can be used to return corresponding PLMN PDU session data. It should be understood that NPN PDU session resources may or may not be used to transmit corresponding NPN PDU session data.
  • the returned data information of the PLMN PDU session includes one or more of the following: PDU session identifier, QoS flow identifier, DRB identifier, or a mapping list between DRB and QoS flow.
  • the backhaul data information of the PLMN PDU session may also include the need to carry the data sent in the DRB to ensure lossless movement, for example, carry the serial number of the uplink PDCP-SN packet data convergence protocol service data unit (Packet Data Convergence Protocol Sequence Number, PDCP-SN) and HFN receiver status information (uplink PDCP-SN and HFN receiver status) and downlink PDCP-SN and HFN transmitter status (downlink PDCP SN and HFN transmitter status) information and many more.
  • PDCP-SN Packet Data Convergence Protocol Sequence Number
  • HFN receiver status information uplink PDCP-SN and HFN receiver status
  • downlink PDCP-SN and HFN transmitter status downlink PDCP SN and HFN transmitter status
  • the status information may include one or more of the cell UL/DL COUNT Value, Transmit Status of UL PDCP SDUs, Receive Status of DL PDCP SDUs, and so on.
  • Transmit Status of UL PDCP SDUs are used to reflect whether the corresponding UL PDCP has been successfully issued, such as 0 means that the corresponding PDCP has not been sent successfully, and 1 means that the corresponding PDCP has been sent successfully.
  • Receive Status of DL PDCP SDUs are used to reflect whether the corresponding DL PDCP has been successfully received. For example, 0 means that the corresponding PDCP has not been successfully received, and 1 means that the corresponding PDCP has been successfully received.
  • the data transmission sequence information is used to indicate the sequence of transmitting the data of the backhauled PLMN PDU session and the data of the newly arrived NPN PDU session in the NPN PDU session resource. For example, use the sequence of NPN PDU session ID and PLMN PDU session ID or the sequence list of NPN PDU session ID and PLMN PDU session ID to indicate the sequence of transmitting the corresponding data.
  • the reason value is used to indicate the reason why the terminal device requests to establish an NPN PDU session, for example, using SNPN, NPN, PLMN, SNPNtoPLMN, PLMNtoSNPN, NPNtoPLMN, PLMNtoNPN, PNI-NPNtoPLMN, PLMNtoPNI-NPN, SNPNtoSNPN, Non-3GPPtoPLMN, PLMNtoNon- The 3GPP, Non-3GPPtoNon-3GPP, or InterNetwork-mobility identification reason value is used to indicate that the terminal device needs to establish NPN PDU session resources to maintain business continuity when moving across networks.
  • the terminal device after the terminal device obtains the backhaul data information locally, it needs to be sent to the access network device 1 and the access network device 2 respectively, so that the access network device 1 and the access network device 2 The returned data information can be aligned.
  • AMF1 will send back data information and mobile notification information to the access network device 1 according to the mobile notification.
  • the access network device 1 receives the backhaul data information and the movement notification information sent by the AMF1 according to the movement notification.
  • the backhaul data information may be carried by RAN Status Transfer (RAN Status Transfer).
  • AMF1 may also send the location information of the terminal device before and/or after the movement to the access network device 1, where the location information after the movement may include the address information of the N3IWF to which the terminal device is connected (for example, NPN-N3IWF IP).
  • the address information of the N3IWF connected after the terminal device moves can also be used to notify the access network device 1 to return data to the address information of the N3IWF connected after the terminal device moves.
  • AMF1 can find the access network device 1 according to the location information before moving.
  • AMF1 sends the backhaul data information to N3IWF1.
  • N3IWF 1 receives the backhaul data information sent by AMF1.
  • AMF1 sends a backhaul channel establishment notification to UPF1 through SMF1.
  • UPF1 receives the backhaul channel establishment notification sent by AMF1 through SMF1.
  • the backhaul channel establishment notification is used to notify the UPF1 to establish the first NPN segment data backhaul channel between the access network device 1 and the UPF1.
  • the return channel establishment notification includes the return data information.
  • the notification of establishment of the backhaul channel may also carry the address information of the N3IWF that the terminal device is connected to after moving, and the PDU Session ID, QFI and DRB ID, etc. that need to perform data backhaul.
  • UPF1 configures the transmission network layer information of the first NPN segment data return channel for the return data according to the return channel establishment notification.
  • the transmission network layer information is used to configure parameters for the first NPN segment data return channel.
  • the transmission network layer information may include one or more of uplink forwarding user plane transmission network layer information (UL Forwarding UP TNL Information) and downlink forwarding user plane transmission network layer information (DL Forwarding UP TNL Information).
  • the forwarding user plane transport network layer information may include the upstream transport layer address (for example, port IP address) and the upstream GTP tunnel port identifier (such as GTP-TEID, GTP-Tunnel Endpoint Identifier, etc.).
  • the downstream forwarding user plane transport network layer may include a downstream transport layer address (for example, port IP address) and a downstream GTP tunnel port identifier (for example, GTP-TEID, GTP-Tunnel Endpoint Identifier, etc.).
  • a downstream transport layer address for example, port IP address
  • a downstream GTP tunnel port identifier for example, GTP-TEID, GTP-Tunnel Endpoint Identifier, etc.
  • UPF1 sends the transmission network layer information to AMF1.
  • AMF1 receives the transmission network layer information sent by UPF1.
  • AMF1 sends the transmission network layer information to the access network device 1.
  • the access network device 1 receives the transmission network layer information sent by the AMF1.
  • UPF1 and the access network device 1 establish first data from UPF1 to the access network device 1.
  • a return channel, and the AMF 1 has notified the UPF1 of the address information of the N3IWF 1 in S406, and a second data return channel is established between UPF1 and N3IWF 1.
  • the first NPN segment data return channel from the access network device 1 to the N3IWF 1 can be obtained.
  • S410 The access network device 1 sends the return data to UPF1.
  • UPF1 receives the backhaul data sent by the access network device 1.
  • UPF1 sends the return data to N3IWF1.
  • N3IWF1 receives the return data sent by UPF1.
  • S412 Access network equipment 2, AMF2, UPF2, SMF2 in the PLMN network and N3IWF1 in the NPN network jointly establish the first PLMN segment from N3IWF 1->data network 2->UPF 2->access network equipment 2 Data return channel.
  • the establishment of the first PLMN segment data return channel may be triggered by the terminal device, or may be triggered by the AMF1.
  • the terminal device triggering means that the terminal device sends NAS information to AMF1 to request the establishment of the first PLMN segment data return channel.
  • AMF1 triggering means that AMF1 establishes the first PLMN segment data return channel based on the content in the mobile notification.
  • the first PLMN segment data return channel can be carried by the established NPN PDU session resource, or it can be an established PLMN segment data return channel dedicated to data return (dedicated data return Transmission channel).
  • the first NPN segment data return channel and the first PLMN segment data return channel constitute a data return channel from the access network device 1 to the access network device 2.
  • the terminal device sends the return data information to the access network device 2.
  • the access network device 2 receives the backhaul data information sent by the terminal device.
  • the returned data information includes one or more of the following: NPN PDU session identification (PDU Session ID), PLMN PDU session identification list, PLMN PDU session return data information, data transmission sequence information, or NPN PDU session resource establishment The reason value.
  • NPN PDU session identifier and the PLMN PDU session identifier in the PLMN PDU session identifier list are used to indicate that the established NPN PDU session resource can be used to return corresponding PLMN PDU session data. It should be understood that NPN PDU session resources may or may not be used to transmit corresponding NPN PDU session data.
  • the returned data information of the PLMN PDU session includes one or more of the following: PDU session identifier, QoS flow identifier, DRB identifier, or a mapping list between DRB and QoS flow.
  • the backhaul data information of the PLMN PDU session may also include the need to carry the data sent in the DRB to ensure lossless movement, for example, carry the serial number of the uplink PDCP-SN packet data convergence protocol service data unit (Packet Data Convergence Protocol Sequence Number, PDCP-SN) and HFN receiver status information (uplink PDCP-SN and HFN receiver status) and downlink PDCP-SN and HFN transmitter status (downlink PDCP SN and HFN transmitter status) information and many more.
  • PDCP-SN Packet Data Convergence Protocol Sequence Number
  • HFN receiver status information uplink PDCP-SN and HFN receiver status
  • downlink PDCP-SN and HFN transmitter status downlink PDCP SN and HFN transmitter status
  • the status information may include one or more of the cell UL/DL COUNT Value, Transmit Status of UL PDCP SDUs, Receive Status of DL PDCP SDUs, and so on.
  • Transmit Status of UL PDCP SDUs are used to reflect whether the corresponding UL PDCP has been successfully issued, such as 0 means that the corresponding PDCP has not been sent successfully, and 1 means that the corresponding PDCP has been sent successfully.
  • Receive Status of DL PDCP SDUs are used to reflect whether the corresponding DL PDCP has been successfully received. For example, 0 means that the corresponding PDCP has not been successfully received, and 1 means that the corresponding PDCP has been successfully received.
  • the data transmission sequence information is used to indicate the sequence of transmitting the data of the backhauled PLMN PDU session and the data of the newly arrived NPN PDU session in the NPN PDU session resource. For example, use the sequence of NPN PDU session ID and PLMN PDU session ID or the sequence list of NPN PDU session ID and PLMN PDU session ID to indicate the sequence of transmitting the corresponding data.
  • the reason value is used to indicate the reason why the terminal device requests to establish an NPN PDU session, for example, using SNPN, NPN, PLMN, SNPNtoPLMN, PLMNtoSNPN, NPNtoPLMN, PLMNtoNPN, PNI-NPNtoPLMN, PLMNtoPNI-NPN, SNPNtoSNPN, Non-3GPPtoPLMN, PLMNtoNon- The 3GPP, Non-3GPPtoNon-3GPP, or InterNetwork-mobility identification reason value is used to indicate that the terminal device needs to establish NPN PDU session resources to maintain business continuity when moving across networks.
  • the terminal device may also return data information Sent to the access network device 2. Since the NPN PDU session resource is carried on the PLMN PDU session resource, in the project of establishing the PLMN PDU session resource for carrying the NPN PDU session, the terminal device can directly send the backhaul data information to the access network device 2. Or, the terminal device sends the return data information to AMF2, and AMF2 forwards it to the access network device 2.
  • the N3IWF 1 sends back the data to the access network device 2 via the data network 2 and the first PLMN segment data return channel of the UPF 2.
  • S415 The access network device 2, UPF2, and DN2 in the PLMN network establish a PLMN PDU session resource for the terminal device to transmit new data of the PLMN PDU session.
  • the access network device 2 may transmit the return data and new data to the terminal device according to the return data information, or the access network device 2 may transmit the return data and new data to the second UPF according to the return data information.
  • the access network device 2 transmits backhaul data and new data to the terminal device according to the backhaul data information, and the access network device 2 transmits the backhaul data information to the equipment of the PLMN core network (for example, , UPF2)
  • the equipment of the PLMN core network for example, , UPF2
  • the method of transmitting backhaul data and new data has been introduced in detail above. For details, please refer to the above and related content, which will not be introduced here.
  • step S413 the terminal device sends back data information to the access network device 2 as an example for description. However, in practical applications, this step can occur from S403 to S415. There is no specific limitation here for any position between.
  • the terminal device may not directly send the return data information to the access network device 2. Instead, the terminal device first sends the return data information to the AMF2 through the NAS message, and then the AMF2 forwards the return data information to the access network device 2. Network equipment 2. Alternatively, after AMF1 receives the movement notification sent by the terminal device, AMF1 sends the movement notification to the access network device 1.
  • the access network device 1 After the access network device 1 receives the movement notification, the access network device 1 obtains the return data information locally and sends the return data information to the AMF1. After the AMF1 receives the return data information, it sends the return data information to the terminal device. After the terminal device receives the return data information, it sends the return data information to the access network device 2.
  • N3IWF 1 can be configured to return tunnel transmission network layer information.
  • the backhaul tunnel transmission network layer information is the backhaul tunnel port on the N3IWF side, for example, the IP address of the N3IWF.
  • N3IWF sends the backhaul tunnel transmission network layer information to AMF1, and AMF1 sends backhaul tunnel information to UPF1 through SMF1 in step S406. At this time, it is unnecessary to carry the IP address of the N3IWF in step S406.
  • the PLMN segment data return channel may be a special NPN PDU session tunnel for data return.
  • AMF2 may send information such as tunnel identification or indication information to notify the access network device 2, UPF2, and SMF2 that the NPN PDU session tunnel is used for data return.
  • the step S403 that the terminal device sends a movement notification to AMF1 through the N1 interface can be replaced by: AMF1 informs the access network device 1 that the terminal device has moved, and combines the identification of the terminal device with The reason value is sent to the access network device 1.
  • the access network device 1 informs AMF1 to establish an NPN segment data return channel, and sends the return data information to AMF1.
  • AMF1 sends back data information to the terminal device.
  • step S412 can occur anywhere from S401 to S415, which is not specifically limited here.
  • the return data in step S414 includes two IPsec headers.
  • the first IPsec header is carried.
  • N3IWF2 adds the second IPsec header to the backhaul data, and then, Send the backhaul data with the second IPsec header added to the access network device 2. Therefore, the terminal device needs to perform the IPsec header twice when analyzing the backhaul data sent by the access network device 2 to the terminal device.
  • Step S410 and Step S411 may also follow S412.
  • Step S402 and step S403 can be combined into the same piece of information.
  • FIG. 13 is an interaction diagram of the second method for data back transmission of the target network proposed by this application.
  • the data backhaul method of this embodiment includes the following steps:
  • S501 In a case where a terminal device accesses the access network device 1 of the source network, the terminal device sends to the access network device 1 notification information about preparing to move. Correspondingly, the access network device 1 receives the ready-to-move notification information sent by the terminal device.
  • the ready-to-move notification is used to notify the access network device 1 that the terminal device is ready to move from the access network device 1 of the source network to the access network device 2 of the destination network.
  • the movement notification carries one or more of the following: a cause value, a type of movement, and location information after the movement (ie, target network location information).
  • the reason value is the reason why the terminal device sends the notification message, for example, moving across networks.
  • the mobility type is when a user moves from a cell of one network to a cell of another network, for example, from NPN to PLMN.
  • the position information after the movement is the position information of the PLMN network where the terminal device is moved, for example, PLMN network identification (Public Land Mobile Network identifier, PLMN ID), tracking area code (TAC), NG-RAN cell ID, terminal equipment identification (UE ID), NG-RAN node ID, connected N3IWF address information (for example, N3IWF IP), etc.
  • the reason value is used to indicate the reason for the terminal device to send the notification message.
  • the reason value is used to indicate the reason for the terminal device to send the notification message.
  • the source network and the target network are implemented in different ways, use SNPN, NPN, PLMN, SNPNtoPLMN, PLMNtoSNPN, NPNtoPLMN, PLMNtoNPN, PNI-NPNtoPLMN, PLMNtoPNI -NPN, SNPNtoSNPN, Non-3GPPtoPLMN, PLMNtoNon-3GPP, Non-3GPPtoNon-3GPP, or InterNetwork-mobility identification reason value, used to indicate the notification message sent due to the cross-network movement of the terminal device.
  • InterNetwork-mobility identification reason value used to indicate the notification message sent due to the cross-network movement of the terminal device.
  • the access network device 1 sends back data information to the terminal device according to the notice of preparing to move.
  • the terminal device receives the backhaul data information sent by the access network device 1 according to the ready-to-move notification.
  • the return data information carries one or more of the following: the return data information of the PLMN PDU session and the reason value.
  • the returned data information of the PLMN PDU session includes one or more of the following: PDU session identifier, QoS flow identifier, DRB identifier, or a mapping list between DRB and QoS flow.
  • the backhaul data information of the PLMN PDU session may also include the need to carry the data sent in the DRB to ensure lossless movement, for example, carry the serial number of the uplink PDCP-SN packet data convergence protocol service data unit (Packet Data Convergence Protocol Sequence Number, PDCP-SN) and HFN receiver status information (uplink PDCP-SN and HFN receiver status) and downlink PDCP-SN and HFN transmitter status (downlink PDCP SN and HFN transmitter status) information and many more.
  • the status information may include one or more of the cell UL/DL COUNT Value, Transmit Status of UL PDCP SDUs, Receive Status of DL PDCP SDUs, and so on.
  • Transmit Status of UL PDCP SDUs are used to reflect whether the corresponding UL PDCP has been successfully issued, such as 0 means that the corresponding PDCP has not been sent successfully, and 1 means that the corresponding PDCP has been sent successfully.
  • Receive Status of DL PDCP SDUs are used to reflect whether the corresponding DL PDCP has been successfully received. For example, 0 means that the corresponding PDCP has not been successfully received, and 1 means that the corresponding PDCP has been successfully received.
  • the reason value is used to indicate the reason for the terminal device to send the notification information, for example, SNPN, NPN, PLMN, SNPNtoPLMN, PLMNtoSNPN, NPNtoPLMN, PLMNtoNPN, PNI-NPNtoPLMN, PLMNtoPNI-NPN, SNPNtoSNPN, Non-3GPPtoPLMN, PLMNtoNon-3GPP, The non-3GPPtoNon-3GPP or InterNetwork-mobility identification cause value is used to instruct the terminal device to send mobile notification information due to cross-network movement.
  • S503 The access network device 1 sends the return data information to AMF1.
  • AMF1 receives the backhaul data information sent by the access network device 1.
  • the information to be returned includes the information described in S502.
  • the access network device 1 may also send the address information of the N3IWF to be connected after the terminal device moves, for example, N3IWF1 IP to AMF1.
  • AMF1 sends the backhaul data information to N3IWF1.
  • N3IWF 1 receives the backhaul data information sent by AMF1.
  • AMF1 sends a backhaul channel establishment notification to UPF1 through SMF1.
  • UPF1 receives the backhaul channel establishment notification sent by AMF1 through SMF1.
  • the backhaul channel establishment notification is used to notify the UPF1 to establish the first NPN segment data backhaul channel between the access network device 1 and the UPF1.
  • the backhaul channel establishment notification may carry the foregoing backhaul data information, and may also carry address information of the N3IWF to which the terminal device is connected after moving to the second network.
  • UPF1 configures the transmission network layer information of the first NPN segment data return channel for the return data according to the return channel establishment notification.
  • the transmission network layer information is used to configure parameters for the first NPN segment data return channel.
  • the transmission network layer information may include one or more of uplink forwarding user plane transmission network layer information (UL Forwarding UP TNL Information) and downlink forwarding user plane transmission network layer information (DL Forwarding UP TNL Information).
  • the forwarding user plane transport network layer information may include the upstream transport layer address (for example, port IP address) and the upstream GTP tunnel port identifier (such as GTP-TEID, GTP-Tunnel Endpoint Identifier, etc.).
  • the downstream forwarding user plane transport network layer may include a downstream transport layer address (for example, port IP address) and a downstream GTP tunnel port identifier (for example, GTP-TEID, GTP-Tunnel Endpoint Identifier, etc.).
  • a downstream transport layer address for example, port IP address
  • a downstream GTP tunnel port identifier for example, GTP-TEID, GTP-Tunnel Endpoint Identifier, etc.
  • UPF1 sends the transmission network layer information to AMF1.
  • AMF1 receives the transmission network layer information sent by UPF1.
  • AMF1 sends the transmission network layer information to the access network device 1.
  • the access network device 1 receives the transmission network layer information sent by the AMF1.
  • UPF1 and the access network device 1 establish first data from the access network device 1 to UPF1 A return channel, and the AMF 1 has notified the UPF1 of the address information of the N3IWF 1 in S505, and a second data return channel is established between UPF1 and N3IWF 1.
  • the first NPN segment data return channel from the access network device 1 to the N3IWF 1 can be obtained.
  • S509 The access network device 1 sends the return data to UPF1.
  • UPF1 receives the backhaul data sent by the access network device 1.
  • UPF1 sends the return data to N3IWF1.
  • N3IWF1 receives the return data sent by UPF1.
  • S511 Access network device 2, AMF2, UPF2, SMF2 in the PLMN network, and N3IWF1 in the NPN network jointly establish the first PLMN segment from N3IWF 1->data network 2->UPF 2->access network device 2 Data return channel.
  • the establishment of the first PLMN segment data return channel may be triggered by the terminal device, or it may be triggered by AMF1.
  • the terminal device triggering means that the terminal device sends NAS information to AMF1 to request the establishment of the first PLMN segment data return channel.
  • AMF1 triggering means that AMF1 establishes the first PLMN segment data return channel based on the content in the mobile notification.
  • the first PLMN segment data return channel can be carried by the established NPN PDU session resource, or it can be an established PLMN segment data return channel dedicated to data return (dedicated data return Transmission channel).
  • the first NPN segment data return channel and the first PLMN segment data return channel constitute a data return channel from the access network device 1 to the access network device 2.
  • the terminal device sends the return data information to the access network device 2.
  • the access network device 2 receives the backhaul data information sent by the terminal device.
  • the terminal device may also return the data The information is sent to the access network device 2.
  • the returned data information can carry one or more of the following: NPN PDU session identifier (PDU Session ID), PLMN PDU session identifier list, PLMN PDU session return data information, data transmission sequence information, or NPN PDU session resource The established reason value.
  • the NPN PDU session identifier and the PLMN PDU session identifier in the PLMN PDU session identifier list are used to indicate that the established NPN PDU session resource can be used to return corresponding PLMN PDU session data. It should be understood that NPN PDU session resources may or may not be used to transmit corresponding NPN PDU session data.
  • the returned data information of the PLMN PDU session includes one or more of the following: PDU session identifier, QoS flow identifier, DRB identifier, or a mapping list between DRB and QoS flow.
  • the backhaul data information of the PLMN PDU session may also include the need to carry the data sent in the DRB to ensure lossless movement, for example, carry the serial number of the uplink PDCP-SN packet data convergence protocol service data unit (Packet Data Convergence Protocol Sequence Number, PDCP-SN) and HFN receiver status information (uplink PDCP-SN and HFN receiver status) and downlink PDCP-SN and HFN transmitter status (downlink PDCP SN and HFN transmitter status) information and many more.
  • the status information may include one or more of the cell UL/DL COUNT Value, Transmit Status of UL PDCP SDUs, Receive Status of DL PDCP SDUs, and so on.
  • Transmit Status of UL PDCP SDUs are used to reflect whether the corresponding UL PDCP has been successfully issued, such as 0 means that the corresponding PDCP has not been sent successfully, and 1 means that the corresponding PDCP has been sent successfully.
  • Receive Status of DL PDCP SDUs are used to reflect whether the corresponding DL PDCP has been successfully received. For example, 0 means that the corresponding PDCP has not been successfully received, and 1 means that the corresponding PDCP has been successfully received.
  • the data transmission sequence information is used to indicate the sequence of transmitting the data of the backhauled PLMN PDU session and the data of the newly arrived NPN PDU session in the NPN PDU session resource.
  • NPN PDU session ID and PLMN PDU session ID For example, use the sequence of NPN PDU session ID and PLMN PDU session ID or the sequence list of NPN PDU session ID and PLMN PDU session ID to indicate the sequence of transmitting the corresponding data. After the data transmission of a PDU session ends, add the end at the end of the data. Mark (end marker), and then continue to transmit data of another PDU session.
  • the reason value is used to indicate the reason why the terminal device requests to establish an NPN PDU session, for example, using SNPN, NPN, PLMN, SNPNtoPLMN, PLMNtoSNPN, NPNtoPLMN, PLMNtoNPN, PNI-NPNtoPLMN, PLMNtoPNI-NPN, SNPNtoSNPN, Non-3GPPtoPLMN, PLMNtoNon- The 3GPP, Non-3GPPtoNon-3GPP, or InterNetwork-mobility identification reason value is used to indicate that the terminal device needs to establish NPN PDU session resources to maintain business continuity when moving across networks.
  • the N3IWF 1 sends back the data to the access network device 2 via the data network 2 and the first PLMN segment data return channel of the UPF 2.
  • S514 The access network device 2, AMF2, UPF2, and SMF2 in the PLMN network establish a PLMN PDU session resource for the terminal device to transmit new data.
  • the access network device 2 may transmit the return data and new data to the terminal device according to the return data information, or the access network device 2 may transmit the return data and new data to the second UPF according to the return data information.
  • the access network device 2 transmits backhaul data and new data to the terminal device according to the backhaul data information, and the access network device 2 transmits the backhaul data information to the equipment of the PLMN core network (for example, , UPF2)
  • the equipment of the PLMN core network for example, , UPF2
  • the method of transmitting backhaul data and new data has been introduced in detail above. For details, please refer to the above and related content, which will not be introduced here.
  • this application also proposes a new target network data return method that is completely different from the above-mentioned target network data return method.
  • FIG. 14 is an interaction diagram of the third method for data backhaul of the target network proposed by this application.
  • the data backhaul method of this embodiment includes the following steps:
  • the terminal device accesses the access network device 1 of the source network, the terminal device sends a move preparation notification to the access network device 1.
  • the access network device 1 receives the ready-to-move notification sent by the terminal device.
  • the ready-to-move notification is used to notify the access network device 1 that the terminal device is ready to move from the access network device 1 of the source network to the access network device 2 of the destination network.
  • the movement notification carries one or more of the following: cause value, type of movement, position information after movement (ie, target network position information), and position information before movement.
  • the reason value is the reason why the terminal device sends the notification message, for example, moving across networks.
  • the mobility type is when a user moves from a cell of one network to a cell of another network, for example, from NPN to PLMN.
  • the position information after the movement is the position information of the PLMN network where the terminal device is moved, for example, PLMN network identification (Public Land Mobile Network identifier, PLMN ID), tracking area code (TAC), NG-RAN cell ID, terminal equipment identification (UE ID), NG-RAN node ID, and address information of the connected N3IWF (for example, N3IWF IP).
  • PLMN network identification Public Land Mobile Network identifier, PLMN ID
  • TAC tracking area code
  • NG-RAN cell ID terminal equipment identification
  • UE ID terminal equipment identification
  • NG-RAN node ID NG-RAN node ID
  • address information of the connected N3IWF for example, N3IWF IP
  • IP N3IWF
  • the access network device 1 sends back data information to the AMF1 according to the notice of preparing to move.
  • the AMF1 receives the backhaul data information sent by the access network device 1 according to the preparation to move notification.
  • the return data information carries one or more of the following: the return data information of the PLMN PDU session and the reason value.
  • the returned data information of the PLMN PDU session includes one or more of the following: PDU session identifier, QoS flow identifier, DRB identifier, or a mapping list between DRB and QoS flow.
  • the backhaul data information of the PLMN PDU session may also include the need to carry the data sent in the DRB to ensure lossless movement, for example, carry the serial number of the uplink PDCP-SN packet data convergence protocol service data unit (Packet Data Convergence Protocol Sequence Number, PDCP-SN) and HFN receiver status information (uplink PDCP-SN and HFN receiver status) and downlink PDCP-SN and HFN transmitter status (downlink PDCP SN and HFN transmitter status) information and many more.
  • the status information may include one or more of the cell UL/DL COUNT Value, Transmit Status of UL PDCP SDUs, Receive Status of DL PDCP SDUs, and so on.
  • Transmit Status of UL PDCP SDUs are used to reflect whether the corresponding UL PDCP has been successfully issued, such as 0 means that the corresponding PDCP has not been sent successfully, and 1 means that the corresponding PDCP has been sent successfully.
  • Receive Status of DL PDCP SDUs are used to reflect whether the corresponding DL PDCP has been successfully received. For example, 0 means that the corresponding PDCP has not been successfully received, and 1 means that the corresponding PDCP has been successfully received.
  • the reason value is used to indicate the reason for the terminal device to send the notification information, for example, SNPN, NPN, PLMN, SNPNtoPLMN, PLMNtoSNPN, NPNtoPLMN, PLMNtoNPN, PNI-NPNtoPLMN, PLMNtoPNI-NPN, SNPNtoSNPN, Non-3GPPtoPLMN, PLMNtoNon-3GPP, The non-3GPPtoNon-3GPP or InterNetwork-mobility identification cause value is used to instruct the terminal device to send mobile notification information due to cross-network movement.
  • AMF1 sends back data information to the terminal device.
  • the terminal device receives the backhaul data information sent by AMF1.
  • the terminal device sends the return data information to AMF2.
  • AMF2 receives the backhaul data information sent by the terminal device.
  • the UE establishes an N1 interface with AMF2 through RAN1>UPF1>DN1>N3IWF2, and the UE sends NAS information to AMF2.
  • AMF2 forwards the return data information to UPF2.
  • UPF2 receives the return data information sent by AMF2.
  • UPF2 configures the transmission network layer information of the second NPN segment data return channel for the return data, and sends it to AMF2.
  • the transmission network layer information is used to configure parameters for the second NPN segment data return channel.
  • the transmission network layer information may include one or more of uplink forwarding user plane transmission network layer information (UL Forwarding UP TNL Information) and downlink forwarding user plane transmission network layer information (DL Forwarding UP TNL Information).
  • the forwarding user plane transport network layer information may include the upstream transport layer address (for example, port IP address) and the upstream GTP tunnel port identifier (such as GTP-TEID, GTP-Tunnel Endpoint Identifier, etc.).
  • the downstream forwarding user plane transport network layer The information may include the downstream transport layer address (for example, port IP address) and the downstream GTP tunnel port identifier (for example, GTP-TEID, GTP-Tunnel Endpoint Identifier, etc.)
  • AMF2 sends the transmission network layer information to N3IWF2.
  • N3IWF2 receives the transmission network layer information sent by AMF2.
  • N3IWF2 can know the address on the UPF2 side based on the information of the transmission network layer, thereby establishing a data return channel from N3IWF2 to UPF2.
  • the terminal device sends a ready-to-move notification to AMF1, where the ready-to-move notification is used to notify the AMF1 that the terminal device is ready to move from the access network device 1 of the source network to the access network device 2 of the destination network.
  • the notification of preparing to move carries one or more of the following: cause value, type of movement, position information after movement (ie, target network position information), and position information before movement.
  • the reason value is the reason why the terminal device sends the notification message, for example, moving across networks.
  • the mobility type is when a user moves from a cell of one network to a cell of another network, for example, from NPN to PLMN.
  • the position information after the movement is the position information of the PLMN network where the terminal device is moved, for example, PLMN network identification (Public Land Mobile Network identifier, PLMN ID), tracking area code (TAC), NG-RAN cell ID, terminal equipment identification (UE ID), NG-RAN node ID, and address information of the connected N3IWF (for example, N3IWF IP).
  • PLMN network identification Public Land Mobile Network identifier, PLMN ID
  • TAC tracking area code
  • NG-RAN cell ID terminal equipment identification
  • UE ID terminal equipment identification
  • NG-RAN node ID NG-RAN node ID
  • address information of the connected N3IWF for example, N3IWF IP
  • IP N3IWF
  • the ready to move notification may also be sent by the access network device 1 to AMF1 after S602, and the ready to move notification carries the above information.
  • AMF1 sends the information (for example, the address information of the N3IWF connected before the move) and the return data information received in S602 to the UPF1 carried in the notice of preparing to move.
  • UPF1 configures the transmission layer network information of the backhaul channel based on the backhaul data information. UPF1 sends the transmission network layer information to AMF1.
  • AMF1 sends the transmission network layer information to the access network device 1.
  • Access network device 1 establishes a backhaul channel from access network device 1 to UPF1 based on the transmission network layer information, and UPF1 establishes a path from UPF1 to N3IWF2 based on the address information of the N3IWF connected before the terminal device moves in S608
  • N3IWF2 establishes a return channel between N3IWF2 based on the transmission network layer information on the UPF2 side in S607.
  • the second NPN segment data return channel between the access network device 1 and the UPF2 is established.
  • AMF2 can also send the transmission network layer information of UPF2 to the terminal device through the N1 interface, the terminal device sends it to AMF1, and AMF1 sends it to UPF1, and UPF1 can establish the return channel information from UPF1 to UPF2 based on the transmission network layer information of UPF2 .
  • the second NPN segment data return channel between the access network device 1 and the UPF2 is established.
  • S612 The access network device 1 sends the return data to the UPF2 through the second NPN segment data return channel.
  • UPF2 receives the return data through the second NPN segment data return channel.
  • S613 The terminal device moves from the access network device 1 of the source network to the access network device 2 of the destination network.
  • S614 The terminal device sends back data information to AMF2.
  • AMF2 receives the backhaul data information sent by the terminal device.
  • AMF2 sends a channel establishment request to UPF2. Accordingly, UPF2 receives the channel establishment request of AMF2. Wherein, the channel establishment request is used to establish a PLMN PDU session resource for the terminal device.
  • UPF2 configures and transmits network layer information for PLMN PDU session resources.
  • UPF2 sends the transmission network layer information to AMF2.
  • AMF2 receives the transport network layer information sent by UPF2.
  • AMF2 sends back data information and transmission network layer information to access network device 2.
  • the access network device 2 receives the backhaul data information and the transmission network layer information sent by the AMF2.
  • the terminal device may also send back data information to the access network device 2.
  • the access network device 2 configures the transmission network layer information to establish the second PLMN segment data return channel.
  • the second PLMN segment data return channel refers to the data return channel from UPF2 to the access network device 2.
  • the second NPN segment data return channel and the second PLMN segment data return channel constitute the data from the access network device 1 to the access network device 2. Return channel.
  • S620 Establish a corresponding DRB between the access network device 2 and the terminal device.
  • UPF2 returns the return data to the access network device 2 through the second PLMN segment data return channel.
  • the terminal device transmits the new uplink data to the access network device 2 through the DRB, and the access network device 2 transmits the newly arrived PLMN PDU session uplink data and the received PLMN PDU session uplink data to the UPF2, or access
  • the network device 2 transmits the downlink backhauled PLMN PDU session data and the downlink newly arrived PLMN PDU session data to the terminal device through the DRB.
  • Both the second NPN segment data return channel and the second PLMN segment data return channel mentioned above are dedicated return channels, and the granularity of the return data can be the PDU session granularity or the DRB granularity.
  • the specific conditions of the two specific ways of returning the data granularity are described in detail below.
  • the second NPN segment data return channel and the second PLMN segment data return channel are both dedicated return channels, and the granularity of the return data may be the PDU session granularity.
  • the access network device 2 sends the received PLMN PDU session data to be returned and the newly arrived PLMN PDU session data to the terminal device through the DRB, and the terminal device sends the PLMN PDU session data to be returned
  • the session data with the newly arrived PLMN PDU is sent to the high-level application in the above sequence, and the high-level application parses out the PLMN PDU session data to be returned and the newly arrived PLMN PDU session data.
  • the transmission mode of the user plane data in the uplink direction and the user plane data in the downlink direction is similar, except that the receiving end is UPF2, that is, the access network device 2 sends the PLMN PDU session data to be returned and the newly arrived PLMN PDU session data. To PLMN-UPF.
  • the second NPN segment data return channel and the second PLMN segment data return channel are both dedicated return channels, and the granularity of the return data may be the granularity of DRB.
  • the access network device 2 performs PDCP numbering, reordering and transmission of the PLMN PDU data to be transmitted back and the newly arrived PLMN PDU session data.
  • any uplink data whose PDCP SN value is lower than the provided UL PDCP SN value should not be transmitted, and the provided DL PDCP SN value should be used as the first downlink data packet to be sent without a PDCP-SN assigned.
  • the PDCP SN value is used to transmit data in order to avoid repeated data transmission.
  • the access network device 2 transmits the data to be returned through DRB
  • the PLMN PDU session data and the newly arrived PLMN PDU session data are sent to the terminal device, and the terminal device sends the PLMN PDU session data to be returned and the newly arrived PLMN PDU session data to the higher-layer application according to the above-mentioned PDCP SN number.
  • the application parses out the PLMN PDU session data to be returned and the newly arrived PLMN PDU session data.
  • the transmission mode of the user plane data in the uplink direction is similar to that of the user plane data in the downlink direction.
  • the PDU session data is sent to UPF2.
  • the access network device 2 sends the PLMN PDU session data to be returned and the newly arrived PLMN PDU session data to UPF2 through NG interface resources instead of DRB resources.
  • FIG. 16 is a schematic structural diagram of a device proposed in this application. As shown in FIG. 16, the device includes: a receiving module 110, a sending module 120, and a processing module 130.
  • the access network device is the first access network device
  • the first access network device is located in the source network
  • the second access network device is located in the target network
  • the source network and the target network respectively adopt different network types
  • the network type includes a public network and a private network
  • the terminal device moves from the first access network device to the second access network device.
  • the processing module 130 instructs the receiving module 110 to receive backhaul data sent by the target network, where the backhaul data is sent by the first access network device but not successfully received by the terminal device Data of the target network, or data of the target network sent by the first access network device but not successfully received by the target network;
  • the processing module 130 instructs the sending module 120 to send the return data to the network device through the source network segment data return channel, so that the network device can send the return data to the network device through the target network segment data return channel.
  • the second access network device instructs the sending module 120 to send the return data to the network device through the source network segment data return channel, so that the network device can send the return data to the network device through the target network segment data return channel.
  • the processing module 130 instructs the sending module 120 to be further used to obtain the return data information, where the return data information carries one or more of the following: the reason for the data return, the type of the data return, and the data return
  • the return data information carries one or more of the following: the reason for the data return, the type of the data return, and the data return
  • the source network is transmitted back to the target network;
  • the processing module 130 instructs the sending module 120 to be further configured to send the backhaul data information to the second access network device.
  • the backhaul data information is sent to the first access and mobility management function AMF through the N1 interface after the terminal device moves to the second access network device, and the first AMF Located in the source network and sent by the first AMF to the first access network device, and at least one of the first backhaul data information and the second backhaul data information is After the terminal device is moved to the second access network device, it is sent to the second access network device; wherein, the N1 interface indicates that the first access network device accesses via the second access network device.
  • the network device, the second UPF, and the first N3IWF are connected to the interface of the first AMF.
  • the returned data information is sent by the first access network device to the terminal device before the terminal device moves to the second access network device, and the terminal device After the device moves to the second access network device, the terminal device sends it to the second access network device.
  • the source network segment data return channel is the channel from the first access network device to the first UPF; or; the source network segment data return channel is the first Access network equipment to the first N3IWF channel.
  • the source network segment data backhaul channel is generated by the first access network device and the first UPF according to the configuration of transmission network layer information
  • the transmission network layer information includes uplink forwarding transmission
  • the uplink forwarding user plane transmission network layer information includes the uplink transmission layer address and the uplink general packet radio service technology tunnel protocol GTP tunnel port identifier
  • the downlink forwarding user plane transmission network layer information includes the downlink transport layer address and the downlink GTP tunnel port identifier.
  • the transmission network layer information is generated by the first UPF, and the transmission network layer information is sent by the first UPF to the first access network device through the first AMF of.
  • the terminal device is configured to send a movement notification to the first AMF after moving from the first access network device to the second access network device, where the mobile The notification is used to notify the first AMF that the terminal device moves from the first access network device to the second access network device.
  • the mobile notification is sent by the terminal device to the first AMF through the N1 interface.
  • the terminal device is configured to move from the first access network device to the second access network device after sending a ready to move notification to the first access network device, where The notification of preparing to move is used to notify the first access network device that the terminal device is ready to move from the first access network device to the second access network device.
  • the target network segment data return channel is the channel from the first UPF to the second access network device; or; the target network segment data return channel is the first The channel from the N3IWF to the second access network device.
  • the target network segment data return channel belongs to a PDU session resource established between the terminal device and the source network.
  • the target network segment data return channel is a dedicated data return channel.
  • the granularity of the returned data is the granularity of the PDU session.
  • the granularity of the returned data is the DRB granularity.
  • the returned data includes a first packet header and a second packet header, where the first packet header is the return data from the target network to the first packet header. It is added when the access network device sends and passes through the first N3IWF, and the second packet header is the return data sent from the first access network device to the second access network device and passes through all Added when the first N3IWF is mentioned.
  • the source network is an NPN network
  • the target network is a PLMN network
  • the source network is a PLMN network
  • the target network is an NPN network
  • the first access network device is not described in detail here. Please refer to FIG. 1 to FIG. 15 and the description of the access network device 1 in the related description, which will not be described here.
  • the access network device is the first access network device
  • the first access network device is located in the source network
  • the second access network device is located in the target network
  • the source network and the target network respectively adopt different network types
  • the network type includes a public network and a private network
  • the terminal device moves from the first access network device to the second access network device.
  • the processing module 130 instructs the receiving module 110 to receive the first return data from the network device through the target network segment data return channel, where the first return data is that the first access network device passes through the source network segment
  • the data backhaul channel is sent to the network device, and the first backhaul data is data of the target network sent by the first access network device but not successfully received by the terminal device.
  • the network device Is the first user plane function UPF or the first non-third-generation partner plan interworking function N3IWF, the first UPF is located in the source network, and the first N3IWF is located in the source network;
  • the processing module 130 instructs the receiving module 110 to receive first data from a second UPF, where the second UPF is located in the target network;
  • the processing module 130 instructs the sending module 120 to send the first return data and the first data to the terminal device;
  • the processing module 130 instructs the receiving module 110 to receive second backhaul data from the network device through the target network segment data backhaul channel, where the second backhaul data is that the first access network device passes through the source network segment
  • the data backhaul channel is sent to the network device, and the second backhaul data is the out-of-sequence data from the terminal device received by the first access network device or the data from the terminal received by the first access network device
  • the mapping relationship between DRB and QoS flow changes. For example, a certain QoS flow data of the original terminal device is transmitted on DRB1 and then on DRB2. , The data of the QoS flow in DRB1 needs to be completely uploaded to the core network before the data of the QoS flow in DRB2 can be transmitted. If the terminal device needs to upload the data of the QoS flow in DRB1 under the target RAN, it needs to be in DRB2 The QoS flow data in the target RAN is sent back to the target RAN, reordered with the QoS flow data in DRB1 under the target RAN, and uploaded to the core network in order;
  • the processing module 130 instructs the receiving module 110 to receive the second data from the terminal device
  • the processing module 130 instructs the sending module 120 to send the second return data and the second data to the second UPF.
  • the processing module 130 instructs the receiving module 110 to be further configured to receive the first return data information, where the first return data information carries one or more of the following: the reason for the need for data return, and the type of data return ,
  • the type of backhaul includes backhaul from the source network to the target network;
  • the processing module 130 instructs the sending module 120 to send the first return data and the first data to the terminal device according to the first return data information
  • the processing module 130 instructs the receiving module 110 to also receive second return data information, the second return data information carrying one or more of the following: the reason for the need for data return, the type of data return, and the The PDU session identifier of the protocol data unit for data return, the identifier of the data radio bearer DRB, or the QoS flow identifier of the quality of service QoS flow corresponding to the DRB, the reason for the data return includes movement, and the data return
  • the type includes backhaul from the source network to the target network;
  • the processing module 130 instructs the sending module 120 to send the second return data and the second data to the second UPF according to the second return data information.
  • At least one of the first backhaul data information and the second backhaul data information is sent through the N1 interface after the terminal device moves to the second access network device
  • the first AMF is located in the source network and sent by the first AMF to the first access network device
  • the first backhaul data is sent to the second access network device after the terminal device moves to the second access network device;
  • the N1 interface represents an interface through which the first access network device connects to the first AMF via the second access network device, the second UPF, and the first N3IWF.
  • At least one of the first backhaul data information and the second backhaul data information is before the terminal device moves to the second access network device, the first An access network device is sent to the terminal device, and after the terminal device moves to the second access network device, the terminal device is sent to the second access network device.
  • the source network segment data return channel is the channel from the first access network device to the first UPF; or; the source network segment data return channel is the first Access network equipment to the first N3IWF channel.
  • the source network segment data backhaul channel is generated by the first access network device and the first UPF according to the configuration of transmission network layer information
  • the transmission network layer information includes uplink forwarding transmission
  • the uplink forwarding user plane transmission network layer information includes the uplink transmission layer address and the uplink general packet radio service technology tunnel protocol GTP tunnel port identifier
  • the downlink forwarding user plane transmission network layer information includes the downlink transport layer address and the downlink GTP tunnel port identifier.
  • the transmission network layer information is generated by the first UPF, and the transmission network layer information is sent by the first UPF to the first access network device through the first AMF of.
  • the target network segment data return channel is the channel from the first UPF to the second access network device; or; the target network segment data return channel is the first The channel from the N3IWF to the second access network device.
  • the target network segment data return channel belongs to the PDU session resource established between the terminal device and the source network
  • the processing module 130 instructs the sending module 120 to instruct the terminal device, the second access network device, to transmit the first backhaul data to the first data through the PDU session resource established between the terminal device and the target network. Data is sent to the terminal device; or,
  • the processing module 130 instructs the sending module 120 to instruct the terminal device, the second access network device, to transmit the first backhaul data to the first data via the PDU session resource established between the terminal device and the source network. Data is sent to the terminal device; or,
  • the processing module 130 instructs the sending module 120 to instruct the terminal device, the second access network device, to send the first backhaul data to the terminal through the PDU session resource established between the terminal device and the source network Device, and sending the first data to the terminal device through a PDU session resource established between the terminal device and the target network.
  • the target network segment data return channel is a dedicated data return channel
  • the second access network device sends the first backhaul data and the first data to the terminal device through the PDU session resource established between the terminal device and the target network.
  • the processing module 130 instructs the sending module 120 to send the first backhaul data to the terminal device first, and then send the first data to the terminal device; or,
  • the processing module 130 instructs the sending module 120 to first send the second return data to the second UPF, and then send the second data to the second UPF.
  • the processing module 130 instructs the sending module 120 to perform packet data convergence protocol PDCP numbering on the first return data and the first data, so as to obtain the numbered first return data and the first data;
  • the processing module 130 instructs the sending module 120 to send the numbered first return data and the first data to the terminal device;
  • the processing module 130 instructs the sending module 120 to perform PDCP numbering on the second return data and the second data, so as to obtain the numbered second return data and the second data;
  • the processing module 130 instructs the sending module 120 to send the numbered second return data and the second data to the second UPF.
  • the first backhaul data includes a first message header and a second message header, where the first message header is the first backhaul data from the target network to the When the first access network device sends and passes through the first N3IWF, the second packet header is the first backhaul data from the first access network device to the second access network Added when the device sends and passes through the first N3IWF again.
  • the source network is an NPN network
  • the target network is a PLMN network
  • the source network is a PLMN network
  • the target network is an NPN network.
  • the second access network device is not described in detail here. Please refer to FIG. 1 to FIG. 15 and the description of the access network device 2 in the related description, which will not be described here.
  • the access network device is the first AMF
  • the first access network device is located in the source network
  • the second access network device is located in the target network.
  • the source network and the target network adopt different network types, respectively.
  • the network types include public networks and private networks, and the terminal device moves from the first access network device to the second access network device.
  • the processing module 130 instructs the receiving module 110 to receive a mobile notification sent by a terminal device or prepare a mobile notification, where the first AMF belongs to the first access network device, and the mobile notification is used to notify the first AMF
  • the terminal device moves from the first access network device to the second access network device, and the notification of preparing to move is used to notify the first access network device that the terminal device is ready to move from the first access network device.
  • the access network device moves to the second access network device;
  • the processing module 130 instructs the sending module 120 to send a backhaul channel establishment notification to the first UPF based on the movement notification or the ready-to-move notification, where the backhaul channel establishment notification is used to notify the first UPF1 to establish the first connection.
  • the source network segment data return channel between the network device and the network device wherein the source network segment data return channel is used for the first access network device to send the return data to the network device, So that the network device sends the backhaul data to the second access network device through the target network segment data backhaul channel, and the backhaul data is sent by the first access network device but not The data of the target network successfully received by the terminal device, or the data of the target network sent by the first access network device but not successfully received by the target network.
  • the receiving module 110 is configured to receive the backhaul data information sent through the N1 interface after the terminal device moves to the second access network device, where the backhaul data information carries One or more of the following: the reason for data return, the type of data return, the ID of the PDU session that needs data return, the ID of the data radio bearer DRB, or the QoS of the quality of service QoS flow corresponding to the DRB Flow identifier, the reason for the data return includes movement, and the type of data return includes the return from the source network to the target network;
  • the processing module 130 instructs the sending module 120 to send the backhaul data information to the second access network device.
  • the N1 interface represents an interface through which the first access network device connects to the first AMF via the second access network device, the second UPF, and the first N3IWF.
  • the source network segment data return channel is the channel from the first access network device to the first UPF; or; the source network segment data return channel is the first Access network equipment to the first N3IWF channel.
  • the source network segment data backhaul channel is generated by the first access network device and the first UPF according to the configuration of transmission network layer information
  • the transmission network layer information includes uplink forwarding transmission
  • the uplink forwarding user plane transmission network layer information includes the uplink transmission layer address and the uplink general packet radio service technology tunnel protocol GTP tunnel port identifier
  • the downlink forwarding user plane transmission network layer information includes the downlink transport layer address and the downlink GTP tunnel port identifier.
  • the processing module 130 instructs the receiving module 110 to receive the transmission network layer information sent by the first UPF, where the transmission network layer information is generated by the first UPF;
  • the sending module 120 is configured to send the transmission network layer information to the first access network device.
  • the processing module 130 instructs the receiving module 110 to receive the movement notification sent by the terminal device through the N1 interface.
  • the target network segment data return channel is the channel from the first UPF to the second access network device; or; the target network segment data return channel is the first The channel from the N3IWF to the second access network device.
  • the target network segment data return channel belongs to a PDU session resource established between the terminal device and the source network.
  • the target network segment data return channel is a dedicated data return channel.
  • the granularity of the returned data is the granularity of the PDU session.
  • the granularity of the returned data is the DRB granularity.
  • the returned data includes a first packet header and a second packet header, where the first packet header is the return data from the target network to the first packet header. It is added when the access network device sends and passes through the first N3IWF, and the second packet header is the return data sent from the first access network device to the second access network device and passes through all Added when the first N3IWF is mentioned.
  • the source network is an NPN network
  • the target network is a PLMN network
  • the source network is a PLMN network
  • the target network is an NPN network
  • the network device in this embodiment may include: a transmitter 210, a receiver 220, a memory 230, and a processor 240.
  • the processor couples the transmitter 210, the receiver 220, and the memory 230 through the bus 250, respectively. among them,
  • the transmitter 210 and the receiver 220 may be provided separately or integrated.
  • the transmitter 210 can be used to send data
  • the receiver 220 can be used to receive data.
  • the memory 230 may include volatile memory (Volatile Memory), such as random access memory (Random Access Memory, RAM); the memory may also include non-volatile memory (Non-Volatile Memory), such as read-only memory (Read-Only Memory). Memory, ROM, Flash Memory, Hard Disk Drive (HDD), or Solid-State Drive (SSD) memory may also include a combination of the foregoing types of memories.
  • volatile memory such as random access memory (Random Access Memory, RAM
  • non-Volatile Memory such as read-only memory (Read-Only Memory).
  • Memory, ROM, Flash Memory, Hard Disk Drive (HDD), or Solid-State Drive (SSD) memory may also include a combination of the foregoing types of memories.
  • the external memory 230 may store program codes and program data.
  • the processor 240 includes one or more general-purpose processors.
  • the general-purpose processor may be any type of device capable of processing electronic instructions, including a central processing unit (CPU), a microprocessor, a microcontroller, and a main Processor, controller, ASIC (Application Specific Integrated Circuit, application specific integrated circuit) and so on.
  • the processor 240 executes various types of digital storage instructions, such as software or firmware programs stored in the memory 230, which enables the identification device to provide a wide variety of services. For example, the processor 240 can execute programs or process data to perform at least a part of the methods discussed herein.
  • the processor 240 is configured to instruct the receiver 220 to receive the backhaul data sent by the target network, where the backhaul data is the first access network device Data of the target network sent but not successfully received by the terminal device, or data of the target network sent by the first access network device but not successfully received by the target network;
  • the processor 240 is configured to instruct the transmitter 210 to send the return data to the network device through the source network segment data return channel, so that the network device can send the return data to the second network device through the target network segment data return channel. Access network equipment.
  • the first access network device is not described in detail here. Please refer to FIG. 1 to FIG. 15 and the description of the access network device 2 in the related description, which will not be described here.
  • the processor 240 is configured to instruct the receiver 220 to receive the first return data from the network device through the target network segment data return channel, where the first The backhaul data is sent by the first access network device to the network device through the source network segment data backhaul channel, and the first backhaul data is sent by the first access network device but not by the The data of the target network successfully received by the terminal device, the network device is the first user plane function UPF or the first non-third-generation partner project interworking function N3IWF, the first UPF is located in the source network, and the The first N3IWF is located in the source network;
  • the processor 240 is configured to instruct the receiver 220 to receive the first data from the second UPF, where the second UPF is located in the target network;
  • the processor 240 is configured to instruct the transmitter 210 to send the first return data and the first data to the terminal device;
  • the processor 240 is configured to instruct the receiver 220 to receive the second backhaul data from the network device through the target network segment data backhaul channel, where the second backhaul data is the first access network device passing through the source network segment
  • the data backhaul channel is sent to the network device, and the second backhaul data is the out-of-sequence data from the terminal device received by the first access network device or the data from the terminal received by the first access network device
  • the processor 240 is configured to instruct the receiver 220 to receive the second data from the terminal device;
  • the processor 240 is configured to instruct the transmitter 210 to send the second return data and the second data to the second UPF.
  • the second access network device is not described in detail here. Please refer to FIG. 1 to FIG. 15 and the description of the access network device 2 in the related description, which will not be described here.
  • the processor 240 is configured to instruct the receiver 220 to receive a mobile notification sent by the terminal device or prepare a mobile notification, where the first AMF belongs to the first access network device, and the mobile The notification is used to notify the first AMF that the terminal device has moved from the first access network device to the second access network device, and the preparation to move notification is used to notify the first access network device to The terminal device is ready to move from the first access network device to the second access network device;
  • the processor 240 is configured to instruct the transmitter 210 to send a backhaul channel establishment notification to the first UPF based on the movement notification or the ready to move notification, where the backhaul channel establishment notification is used to notify the first UPF1 to establish the first connection.
  • the source network segment data return channel between the network device and the network device wherein the source network segment data return channel is used for the first access network device to send the return data to the network device, So that the network device sends the backhaul data to the second access network device through the target network segment data backhaul channel, and the backhaul data is sent by the first access network device but not The data of the target network successfully received by the terminal device, or the data of the target network sent by the first access network device but not successfully received by the target network.
  • the first AMF is not described in detail here. Please refer to FIG. 1 to FIG. 15 and the description of the access network device 2 in the related description, which will not be described here.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center integrated with one or more available media.
  • the usable medium may be a magnetic medium, (for example, a floppy disk, a storage disk, and a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a Solid State Disk (SSD)).

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Abstract

本申请提供了一种数据回传方法以及设备。在终端设备从第一接入网设备移动至第二接入网设备之后，所述第二接入网设备接收来自网络设备通过目标网络段数据回传通道的第一回传数据，以及，来自第二UPF的第一数据。然后，所述第二接入网设备将所述第一回传数据和所述第一数据发送给所述终端设备。或者，在终端设备从第一接入网设备移动至第二接入网设备之后，所述第二接入网设备接收来自网络设备通过目标网络段数据回传通道的第二回传数据，以及，接收来自所述终端设备的第二数据；然后，所述第二接入网设备将所述第二回传数据和所述第二数据发送给所述第二UPF。

Description

数据回传方法以及设备
本申请要求于2019年08月16日提交中国专利局、申请号为201910760466.4、申请名称为“数据回传方法以及设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信领域，尤其涉及一种数据回传方法以及设备。
背景技术
由于接入网设备的覆盖面积有限，因此，终端设备接入网设备1覆盖的地方移动至接入网设备2覆盖的地方时，需要将终端设备从接入网设备1切换至接入网设备2。以数据下行为例，在切换前，数据网络将数据发送给接入网设备1，并由接入网设备1发送给终端设备，在切换后，数据网络将数据发送给接入网设备2，并由接入网设备2发送给终端设备。在切换过程中，如果数据网络已经将数据发送给接入网设备1，但是，尚未发送给终端设备时，终端设备从接入网设备1切换至接入网设备2，会导致接入网设备1无法将数据发送给终端设备，该数据可以称之为回传数据。
在接入网设备1和接入网设备2属于同一种组网方式，即，接入网设备1和接入网设备2是同网切换时，接入网设备1和接入网设备2之间通常具有一个数据传输通道，接入网设备1可以通过该数据传输通道将回传数据发送给接入网设备2，再由接入网设备2发送给终端设备。
但是，当接入网设备1和接入网设备2不属于同一种组网方式，即，接入网设备1和接入网设备2是跨网切换时，接入网设备1无法将回传数据发送给接入网设备2。
发明内容
为了解决上述问题，本申请提供了一种数据回传方法，能够将回传数据跨网进行回传。
第一方面，提供了一种数据回传方法，第一接入网设备位于源网络，第二接入网设备位于目标网络，所述源网络和所述目标网络分别采用不同的网络类型，所述网络类型包括公有网络以及私有网络，终端设备从所述第一接入网设备移动至所述第二接入网设备，所述方法包括：
所述第二接入网设备接收来自网络设备通过目标网络段数据回传通道的第一回传数据，其中，所述第一回传数据是所述第一接入网设备通过源网络段数据回传通道发送给所述网络设备，所述第一回传数据为所述第一接入网设备发送的但未被所述终端设备成功接收的所述目标网络的数据，所述网络设备为第一用户面功能UPF或者第一非第三代合作伙伴计划互通功能N3IWF，所述第一UPF位于所述源网络，所述第一N3IWF位于所述源网络；
所述第二接入网设备接收来自第二UPF的第一数据，所述第二UPF位于所述目标网络；
所述第二接入网设备将所述第一回传数据和所述第一数据发送给所述终端设备；
或者；
所述第二接入网设备接收来自网络设备通过目标网络段数据回传通道的第二回传数据，其中，所述第二回传数据是所述第一接入网设备通过源网络段数据回传通道发送给所述网络设备，所述第二回传数据为所述第一接入网设备接收的来自终端设备的乱序的数据或者所述第一接入网设备接收的来自终端设备的需要进行重新排序的数据；
所述第二接入网设备接收来自所述终端设备的第二数据；
所述第二接入网设备将所述第二回传数据和所述第二数据发送给所述第二UPF。
上述方案中，在分属不同的网络类型的第一接入网设备和第二接入网设备之间建立了传输通道，从而实现了将回传数据从第一接入网设备回传给第二接入网设备。
在一些可能的设计中，所述第二接入网设备将所述第一回传数据和所述第一数据发送给所述终端设备，包括：
所述第二接入网设备接收第一回传数据信息，其中，所述第一回传数据信息携带以下一个或多个：需要进行数据回传的原因，数据回传的类型，需要进行数据回传的协议数据单元PDU会话标识，数据无线承载DRB的标识，或所述DRB所对应的服务质量QoS流的QoS流标识，所述数据回传的原因包括移动，所述数据回传的类型包括从所述源网络回传到所述目标网络；
所述第二接入网设备根据所述第一回传数据信息将所述第一回传数据和所述第一数据发送给所述终端设备；
或者；
所述第二接入网设备将所述第二回传数据和所述第二数据发送给所述第二UPF，包括：
所述第二接入网设备接收第二回传数据信息，所述第二回传数据信息携带以下一个或多个：需要进行数据回传的原因，数据回传的类型，需要进行数据回传的协议数据单元PDU会话标识，数据无线承载DRB的标识，或所述DRB所对应的服务质量QoS流的QoS流标识，所述数据回传的原因包括移动，所述数据回传的类型包括从所述源网络回传到所述目标网络；
所述第二接入网设备根据所述第二回传数据信息将所述第二回传数据和所述第二数据发送给所述第二UPF。
在一些可能的设计中，所述第一回传数据信息和所述第二回传数据信息中的至少一项是所述终端设备移动到所述第二接入网设备之后，通过N1接口发送给第一接入和移动管理功能AMF，所述第一AMF位于所述源网络，并由所述第一AMF发送给所述第一接入网设备的，并且，所述第一回传数据信息和所述第二回传数据信息中的至少一项是所述终端设备移动到所述第二接入网设备之后，发送给所述第二接入网设备的；其中，
所述N1接口表示所述第一接入网设备经由所述第二接入网设备、所述第二UPF、所述第一N3IWF连接所述第一AMF的接口。
上述方案中，通过N1接口实现了将第一回传数据信息和第二回传数据信息发送给第一AMF，以使得第一AMF能够将第一回传数据信息和第二回传数据信息发送给第一接入网设备。
在一些可能的设计中，所述第一回传数据信息和所述第二回传数据信息中的至少一项是在所述终端设备移动到所述第二接入网设备之前，所述第一接入网设备发送给所述终端 设备，在所述终端设备移动到所述第二接入网设备之后，所述终端设备发送给所述第二接入网设备的。
上述方案中，可以利用终端设备实现了将第一回传数据信息和第二回传数据信息发送给第一接入网设备。
在一些可能的设计中，所述源网络段数据回传通道为所述第一接入网设备到所述第一UPF的通道；或者；
所述源网络段数据回传通道为所述第一接入网设备到所述第一N3IWF的通道。
在一些可能的设计中，所述源网络段数据回传通道是所述第一接入网设备和所述第一UPF根据传输网络层信息配置生成的，所述传输网络层信息包括上行转发传输网络层信息和下行转发用户面传输网络层信息中的一种或者多种，所述上行转发用户面传输网络层信息包括上行传输层地址和上行通用分组无线服务技术隧道协议GTP隧道端口标识，所述下行转发用户面传输网络层信息包括下行传输层地址和下行GTP隧道端口标识。
在一些可能的设计中，所述传输网络层信息是所述第一UPF生成的，并且，所述传输网络层信息是所述第一UPF通过第一AMF发送给所述第一接入网设备的。
在一些可能的设计中，所述终端设备用于在从所述第一接入网设备移动至所述第二接入网设备之后，向所述第一AMF发送移动通知，其中，所述移动通知用于通知所述第一AMF所述终端设备从所述第一接入网设备移动至所述第二接入网设备。
在一些可能的设计中，所述移动通知是所述终端设备通过所述N1接口发送给所述第一AMF的。
在一些可能的设计中，所述终端设备用于在向所述第一接入网设备发送准备移动通知之后，从所述第一接入网设备移动至所述第二接入网设备，其中，所述准备移动通知用于通知所述第一接入网设备所述终端设备准备从所述第一接入网设备移动至所述第二接入网设备。
在一些可能的设计中，所述目标网络段数据回传通道为所述第一UPF到所述第二接入网设备的通道；或者；
所述目标网络段数据回传通道为所述第一N3IWF到所述第二接入网设备的通道。
在一些可能的设计中，在所述目标网络段数据回传通道属于所述终端设备与所述源网络之间建立的PDU会话资源的情况下，
所述第二接入网设备指示终端设备所述第二接入网设备通过所述终端设备与所述目标网络之间建立的PDU会话资源将所述第一回传数据和所述第一数据发送给所述终端设备；或者，
所述第二接入网设备指示终端设备所述第二接入网设备通过所述终端设备与所述源网络之间建立的PDU会话资源将所述第一回传数据和所述第一数据发送给所述终端设备；或者，
所述第二接入网设备指示终端设备所述第二接入网设备通过所述终端设备与所述源网络之间建立的PDU会话资源将所述第一回传数据发送给所述终端设备，以及，通过所述终端设备与所述目标网络之间建立的PDU会话资源将所述第一数据发送给所述终端设备。
在一些可能的设计中，在所述目标网络段数据回传通道为专用数据回传通道的情况下，
所述第二接入网设备通过所述终端设备与所述目标网络之间建立的PDU会话资源将所述第一回传数据和所述第一数据发送给所述终端设备。
在一些可能的设计中，在所述回传数据的粒度为PDU会话粒度的情况下，
所述第二接入网设备先将所述第一回传数据发送给所述终端设备，然后，再将所述第一数据发送给所述终端设备；或者，
所述第二接入网设备先将所述第二回传数据发送给所述第二UPF，然后，再将所述第二数据发送给所述第二UPF。
在一些可能的设计中，在所述回传数据的粒度为DRB粒度的情况下，
所述第二接入网设备将所述第一回传数据和所述第一数据进行分组数据汇聚协议PDCP编号，从而得到编号后的所述第一回传数据和所述第一数据；
所述第二接入网设备将编号后的所述第一回传数据和所述第一数据发送给所述终端设备；
或者；
所述第二接入网设备将所述第二回传数据和所述第二数据进行PDCP编号，从而得到编号后的所述第二回传数据和所述第二数据；
所述第二接入网设备将编号后的所述第二回传数据和所述第二数据发送给所述第二UPF。
在一些可能的设计中，所述第一回传数据包括第一报文头以及第二报文头，其中，所述第一报文头是所述第一回传数据从所述目标网络向所述第一接入网设备发送并经过第一N3IWF时添加的，所述第二报文头是所述第一回传数据从所述第一接入网设备向所述第二接入网设备发送并再次经过所述第一N3IWF时添加的。
在一些可能的设计中，所述源网络为NPN网络，所述目标网络为PLMN网络；或者，所述源网络为PLMN网络，所述目标网络为NPN网络。
第二方面，提供了一种数据回传方法，第一接入网设备位于源网络，第二接入网设备位于目标网络，所述源网络和所述目标网络分别采用不同的网络类型，所述网络类型包括公有网络以及私有网络，终端设备从所述第一接入网设备移动至所述第二接入网设备，所述方法包括：
所述第一接入网设备接收所述目标网络发送的回传数据，其中，所述回传数据为所述第一接入网设备发送的但未被所述终端设备成功接收的所述目标网络的数据，或者，所述第一接入网设备发送的但未被所述目标网络成功接收的所述目标网络的数据；
所述第一接入网设备通过源网络段数据回传通道将回传数据发送给网络设备，以供所述网络设备通过目标网络段数据回传通道将所述回传数据发送给第二接入网设备。
上述方案中，在分属不同的网络类型的第一接入网设备和第二接入网设备之间建立了传输通道，于是，第一接入网设备可以通过第一接入网设备和第二接入网设备之间建立的传输通道将回传数据从第一接入网设备回传给第二接入网设备。
在一些可能的设计中，所述第一接入网设备获取回传数据信息，其中，所述回传数据信息携带以下一个或多个：需要进行数据回传的原因，数据回传的类型，需要进行数据回传的PDU会话标识，数据无线承载DRB的标识，或所述DRB所对应的服务质量QoS流 的QoS流标识，所述数据回传的原因包括移动，所述数据回传的类型包括从所述源网络回传到所述目标网络；
所述第一接入网设备向所述第二接入网设备发送所述回传数据信息。
在一些可能的设计中，所述回传数据信息是所述终端设备移动到所述第二接入网设备之后，通过N1接口发送给第一接入和移动管理功能AMF，所述第一AMF位于所述源网络，并由所述第一AMF发送给所述第一接入网设备的，并且，所述第一回传数据信息和所述第二回传数据信息中的至少一项是所述终端设备移动到所述第二接入网设备之后，发送给所述第二接入网设备的；其中，所述N1接口表示所述第一接入网设备经由所述第二接入网设备、所述第二UPF、所述第一N3IWF连接所述第一AMF的接口。
在一些可能的设计中，所述回传数据信息是在所述终端设备移动到所述第二接入网设备之前，所述第一接入网设备发送给所述终端设备，在所述终端设备移动到所述第二接入网设备之后，所述终端设备发送给所述第二接入网设备的。
上述方案中，可以利用终端设备实现了将第一回传数据信息和第二回传数据信息发送给第一接入网设备。
在一些可能的设计中，所述源网络段数据回传通道为所述第一接入网设备到所述第一UPF的通道；或者；所述源网络段数据回传通道为所述第一接入网设备到所述第一N3IWF的通道。
在一些可能的设计中，所述源网络段数据回传通道是所述第一接入网设备和所述第一UPF根据传输网络层信息配置生成的，所述传输网络层信息包括上行转发传输网络层信息和下行转发用户面传输网络层信息中的一种或者多种，所述上行转发用户面传输网络层信息包括上行传输层地址和上行通用分组无线服务技术隧道协议GTP隧道端口标识，所述下行转发用户面传输网络层信息包括下行传输层地址和下行GTP隧道端口标识。
在一些可能的设计中，所述传输网络层信息是所述第一UPF生成的，并且，所述传输网络层信息是所述第一UPF通过第一AMF发送给所述第一接入网设备的。
在一些可能的设计中，所述终端设备用于在从所述第一接入网设备移动至所述第二接入网设备之后，向所述第一AMF发送移动通知，其中，所述移动通知用于通知所述第一AMF所述终端设备从所述第一接入网设备移动至所述第二接入网设备。
在一些可能的设计中，所述移动通知是所述终端设备通过所述N1接口发送给所述第一AMF的。
在一些可能的设计中，所述终端设备用于在向所述第一接入网设备发送准备移动通知之后，从所述第一接入网设备移动至所述第二接入网设备，其中，所述准备移动通知用于通知所述第一接入网设备所述终端设备准备从所述第一接入网设备移动至所述第二接入网设备。
在一些可能的设计中，所述目标网络段数据回传通道为所述第一UPF到所述第二接入网设备的通道；或者；所述目标网络段数据回传通道为所述第一N3IWF到所述第二接入网设备的通道。
在一些可能的设计中，所述目标网络段数据回传通道属于所述终端设备与所述源网络之间建立的PDU会话资源。
在一些可能的设计中，所述目标网络段数据回传通道为专用数据回传通道。
在一些可能的设计中，所述回传数据的粒度为PDU会话粒度。
在一些可能的设计中，在所述回传数据的粒度为DRB粒度。
在一些可能的设计中，所述回传数据包括第一报文头以及第二报文头，其中，所述第一报文头是所述回传数据从所述目标网络向所述第一接入网设备发送并经过第一N3IWF时添加的，所述第二报文头是所述回传数据从所述第一接入网设备向所述第二接入网设备发送并再次经过所述第一N3IWF时添加的。
在一些可能的设计中，所述源网络为NPN网络，所述目标网络为PLMN网络；或者，所述源网络为PLMN网络，所述目标网络为NPN网络。
第三方面，提供了一种数据回传方法，第一接入网设备位于源网络，第二接入网设备位于目标网络，所述源网络和所述目标网络分别采用不同的网络类型，所述网络类型包括公有网络以及私有网络，终端设备从所述第一接入网设备移动至所述第二接入网设备，所述方法包括：
第一AMF接收终端设备发送的移动通知或者准备移动通知，其中，所述第一AMF属于所述第一接入网设备，所述移动通知用于通知所述第一AMF所述终端设备从所述第一接入网设备移动至所述第二接入网设备，所述准备移动通知用于通知所述第一接入网设备所述终端设备准备从所述第一接入网设备移动至所述第二接入网设备；
所述第一AMF基于所述移动通知或者准备移动通知向第一UPF发送回传通道建立通知，其中，所述回传通道建立通知用于通知第一UPF1建立所述第一接入网设备至网络设备之间的源网络段数据回传通道，其中，所述源网络段数据回传通道用于供所述第一接入网设备将回传数据发送给所述网络设备，以使得所述网络设备将所述回传数据通过目标网络段数据回传通道发送给所述第二接入网设备，所述回传数据为所述第一接入网设备发送的但未被所述终端设备成功接收的所述目标网络的数据，或者，所述第一接入网设备发送的但未被所述目标网络成功接收的所述目标网络的数据。
上述方案中，第一AMF根据所述移动通知或者准备移动通知在分属不同的网络类型的第一接入网设备和第二接入网设备之间建立了传输通道，从而实现了将回传数据从第一接入网设备回传给第二接入网设备。
在一些可能的设计中，所述第一AMF接收所述终端设备移动到所述第二接入网设备之后，通过N1接口发送的回传数据信息，其中，所述回传数据信息携带以下一个或多个：需要进行数据回传的原因，数据回传的类型，需要进行数据回传的PDU会话标识，数据无线承载DRB的标识，或所述DRB所对应的服务质量QoS流的QoS流标识，所述数据回传的原因包括移动，所述数据回传的类型包括从所述源网络回传到所述目标网络；
所述第一AMF向第二接入网设备发送所述回传数据信息。
在一些可能的设计中，所述N1接口表示所述第一接入网设备经由所述第二接入网设备、所述第二UPF、所述第一N3IWF连接所述第一AMF的接口。
在一些可能的设计中，所述源网络段数据回传通道为所述第一接入网设备到所述第一UPF的通道；或者；所述源网络段数据回传通道为所述第一接入网设备到所述第一N3IWF的通道。
在一些可能的设计中，所述源网络段数据回传通道是所述第一接入网设备和所述第一UPF根据传输网络层信息配置生成的，所述传输网络层信息包括上行转发传输网络层信息和下行转发用户面传输网络层信息中的一种或者多种，所述上行转发用户面传输网络层信息包括上行传输层地址和上行通用分组无线服务技术隧道协议GTP隧道端口标识，所述下行转发用户面传输网络层信息包括下行传输层地址和下行GTP隧道端口标识。
在一些可能的设计中，所述第一AMF接收所述第一UPF发送的所述传输网络层信息，其中，所述传输网络层信息是所述第一UPF生成的；所述第一AMF将所述传输网络层信息发送给所述第一接入网设备。
在一些可能的设计中，所述第一AMF接收所述终端设备通过N1接口发送的所述移动通知。
在一些可能的设计中，所述目标网络段数据回传通道为所述第一UPF到所述第二接入网设备的通道；或者；所述目标网络段数据回传通道为所述第一N3IWF到所述第二接入网设备的通道。
在一些可能的设计中，所述目标网络段数据回传通道属于所述终端设备与所述源网络之间建立的PDU会话资源，或者，所述目标网络段数据回传通道为专用数据回传通道。
上述方案中，为所述目标网络段数据回传通道提供了两种不同的实施方式，增加了方案的选择性。
在一些可能的设计中，所述回传数据的粒度为PDU会话粒度。
在一些可能的设计中，在所述回传数据的粒度为DRB粒度。
在一些可能的设计中，所述回传数据包括第一报文头以及第二报文头，其中，所述第一报文头是所述回传数据从所述目标网络向所述第一接入网设备发送并经过第一N3IWF时添加的，所述第二报文头是所述回传数据从所述第一接入网设备向所述第二接入网设备发送并再次经过所述第一N3IWF时添加的。
在一些可能的设计中，所述源网络为NPN网络，所述目标网络为PLMN网络；或者，所述源网络为PLMN网络，所述目标网络为NPN网络。
第四方面，提供了一种接入网设备，包括用于实现第一方面或第二方面任一项所述的方法的单元。
第五方面，提供了一种AMF，包括用于实现第三方面任一项所述的方法的单元。
第六方面，提供了一种接入网设备，包括处理器和存储器，所述处理器执行所述存储器中的代码执行如第一方面或者第二方面任一项所述的方法的单元。
第七方面，提供了一种AMF，包括处理器和存储器，所述处理器执行所述存储器中的代码执行如第三方面任一项所述的方法的单元。
第八方面，一种可读存储介质，包括指令，当所述指令在设备上运行时，使得所述设备执行如第一方面或第二方面或第三方面任一项所述的方法。
第九方面，提供了一种程序产品，当所述程序产品被设备读取并执行时，如第一方面或第二方面或第三方面任一项所述的方法将被执行。
附图说明
为了更清楚地说明本申请实施例或背景技术中的技术方案，下面将对本申请实施例或背景技术中所需要使用的附图进行说明。
图1是本申请提供的一种NPN的独立组网方式的结构示意图；
图2是本申请涉及的终端设备位于NPN网络覆盖的范围时接入网设备1和DN2之间的传输通道的示意图；
图3是本申请涉及的终端设备位于PLMN网络覆盖的范围时接入网设备2和DN2之间的传输通道的示意图；
图4是本申请提供的数据回传通路建立方法的流程示意图；
图5是本申请提供的接入网设备1至UPF1的第一NPN段数据回传通道的示意图；
图6是本申请提供的一种回传数据信息的传输方法的流程示意图；
图7是本申请中终端设备通过N1接口向AMF1发送回传数据信息的示意图；
图8是本申请提供的一种回传数据信息的传输方法的流程示意图；
图9是本申请中回传数据信息的传输过程的示意图；
图10是本申请中接入网设备2和终端设备之间存在两条传输回传数据和新数据的通道的示意图；
图11是本申请中接入网设备2和终端设备之间只存在一条传输回传数据和新数据的通道的示意图；
图12是本申请提出的第一实施例的目标网络的数据回传方法的交互图；
图13是本申请提出的第二种目标网络的数据回传方法的交互图；
图14是本申请提出的第三种目标网络的数据回传方法的交互图；
图15是本申请中的第二PLMN段数据回传通道的示意图；
图16是本申请提供的一种设备的结构示意图；
图17是本申请提供的一种网络设备的结构示意图。
具体实施方式
为了便于理解，下面首先对本申请涉及NPN的独立组网方式进行详细的介绍。
NPN可以通过独立组网(standalone)的方式进行组网。如图1所示，在独立组网方式中，同时存在NPN网络和PLMN网络。其中，NPN网络包括独立的非3AGPP接入网、核心网(core network，CN)1和数据网络1。非3AGPP接入网可以包括接入设1，所述接入网设备1可以是3AGPP接入网的接入网设备。CN1可以包括认证管理功能1(Authentication Management Function，AMF)、服务管理功能1(service management facility，SMF)以及用户面功能1(User Plane Function，UPF)等等网元。PLMN网络也包括独立的3GPP接入网、核心网2和数据网络2。3GPP接入网可以包括接入网设备2，所述接入网设备2可以是3GPP接入网的接入网设备。核心网2可以包括AMF2、SMF2以及UPF2等等网元。NPN网络的CN1和PLMN网络的CN2之间可以通过非3GPP网间互通功能(Non-3GPP interworking function，N3IWF)网络传输数据。其中，NPN网络的N3IWF 1一边连接NPN网络的UPF1，另一方面连接PLMN网络中的数据网络2。PLMN网络的N3IWF 2一边连 接PLMN网络的UPF2，另一方面连接NPN网络中的数据网络1。
下面首先对本申请涉及的终端设备和NPN的独立组网方式中涉及的网元进行详细的介绍。这里，NPN的独立组网方式中涉及的网元包括接入网设备、AMF、UPF、SMF以及N3IWF。
终端设备可以是用户侧的一种用于接收或发射信号的实体，如新一代用户设备(new generation UE，gUE)。终端设备也可以称为终端设备(User Equipment，UE)、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置。终端设备可以是无线局域网(Wireless Local Area Networks，WLAN)中的站点(STAION，ST)，可以是蜂窝电话、无绳电话、会话启动协议(Session Initiation Protocol，SIP)电话、无线本地环路(Wireless Local Loop，WLL)站、个人数字处理(Personal Digital Assistant，PDA)设备、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备以及下一代通信系统，例如，第五代通信(fifth-generation，5G)网络中的终端设备或者未来演进的公共陆地移动网络(Public Land Mobile Network，PLMN)网络中的终端设备，新无线(New Radio，NR)通信系统中的终端设备等。作为示例而非限定，在本发明实施例中，该终端设备还可以是可穿戴设备。可穿戴设备也可以称为穿戴式智能设备，是应用穿戴式技术对日常穿戴进行智能化设计、开发出可以穿戴的设备的总称，如眼镜、手套、手表、服饰及鞋等。可穿戴设备即直接穿在身上，或是整合到用户的衣服或配件的一种便携式设备。可穿戴设备不仅仅是一种硬件设备，更是通过软件支持以及数据交互、云端交互来实现强大的功能。广义穿戴式智能设备包括功能全、尺寸大、可不依赖智能手机实现完整或者部分的功能，例如：智能手表或智能眼镜等，以及只专注于某一类应用功能，需要和其它设备如智能手机配合使用，如各类进行体征监测的智能手环、智能首饰等。
接入网设备可以是网络侧的一种用于发射或接收信号的实体，如新一代基站(new generation Node B，gNodeB)。接入网设备还可以是用于与移动设备通信的设备，接入网设备可以是无线局域网(Wireless LAN，WLAN)中的接入点(Access Point，AP)，全球移动通信系统(Global System for Mobile Communication，GSM)或码分多址(Code Division Multiple Access，CDMA)中的基站(Base Transceiver Station，BTS)，也可以是宽带码分多址(Wideband Code Division Multiple Access，WCDMA)中的基站(NodeB，NB)，还可以是长期演进(Long Term Evolution，LTE)中的演进型基站(Evolutional Node B，eNB或eNodeB)，或者中继站或接入点，或者车载设备、可穿戴设备以及未来5G网络中的网络设备或者未来演进的公共陆地移动网络(Public Land Mobile Network，PLMN)网络中的网络设备，或NR系统中的gNodeB等。另外，在本发明实施例中，接入网设备为小区提供服务，终端设备通过该小区使用的传输资源(例如，频域资源，或者说，频谱资源)与网络设备进行通信，该小区可以是网络设备(例如基站)对应的小区，小区可以属于宏基站，也可以属于小小区(small cell)对应的基站，这里的小小区可以包括：城市小区(metro cell)、微小区(micro cell)、微微小区(pico cell)、毫微微小区(femto cell)等，这些小小区具有覆盖范围小、发射功率低的特点，适用于提供高速率的数据传输服务。
AMF用于负责终端设备的接入权限和移动性管理。AMF可以支持如下功能：终止RAN  CP接口(N2)、终止NAS(N1)，NAS加密和完整性保护、注册管理、连接管理、可达性管理、流动性管理、合法拦截(适用于AMF事件和LI系统的接口)、为UE和SMF之间的SM消息提供传输、用于路由SM消息的透明代理、接入身份验证、接入授权、在UE和SMSF之间提供SMS消息的传输、安全锚功能(SEAF)、监管服务的定位服务管理、为UE和LMF之间以及RAN和LMF之间的位置服务消息提供传输、用于与EPS互通的EPS承载ID分配、UE移动事件通知。此外，AMF还可以支持如下功能：支持N2接口与N3IWF，在该接口上，可以不应用通过3GPP接入定义的一些信息(例如，3GPP小区标识)和过程(例如，与移动相关)，并且可以应用不适用于3GPP接入的非3GPP接入特定信息、通过N3IWF上的UE支持NAS信令、由3GPP接入上的NAS信令支持的一些过程可能不适用于不可信的非3GPP(例如寻呼)接入、支持通过N3IWF连接的UE的认证、管理通过非3GPP接入连接或通过3GPP和非3GPP同时连接的UE的移动性，认证和单独的安全上下文状态、支持协调的RM管理上下文，该上下文对3GPP和非3GPP访问有效、支持针对UE的专用CM管理上下文，用于通过非3GPP接入进行连接、SMF可以提供服务连续性，服务的不间断用户体验，包括IP地址和/或锚点变化的情况。
UPF可以与UPF关联的协议数据单元(Protocol Data Unit，PDU)会话可以由无线接入网络通过无线接入网络和UPF之间的N3接口服务的区域，而无需在其间添加新的UPF或移除/重新分配UPF。UPF可以支持如下功能：用于RAT内/RAT间移动性的锚点(适用时)、外部PDU与数据网络互连的会话点、分组路由和转发(例如，支持上行链路分类器以将业务流路由到数据网络的实例，支持分支点以支持多宿主PDU会话)、数据包检查(例如，基于服务数据流模板的应用程序检测以及从SMF接收的可选PFD)、用户平面部分策略规则实施，例如门控，重定向，流量转向、合法拦截(UP收集)、流量使用报告、用户平面的QoS处理，例如UL/DL速率实施，DL中的反射QoS标记、上行链路流量验证(SDF到QoS流量映射)、上行链路和下行链路中的传输级分组标记、下行数据包缓冲和下行数据通知触发、将一个或多个“结束标记”发送和转发到源NG-RAN节点、ARP代理和/或以太网PDU的IPv6 Neighbor Solicitation Proxying、UPF通过提供与请求中发送的IP地址相对应的MAC地址来响应ARP和/或IPv6邻居请求。
SMF提供服务连续性，服务的不间断用户体验，包括IP地址和/或锚点变化的情况。SMF的功能包括：会话管理，例如会话建立，修改和释放，包括UPF和AN节点之间的隧道维护、UE IP地址分配和管理(包括可选的授权)、DHCPv4(服务器和客户端)和DHCPv6(服务器和客户端)功能、ARP代理和/或以太网PDU的IPv6 Neighbor Solicitation Proxying、SMF通过提供与请求中发送的IP地址相对应的MAC地址来响应ARP和/或IPv6邻居请求、选择和控制UP功能，包括控制UPF代理ARP或IPv6邻居发现，或将所有ARP/IPv6邻居请求流量转发到SMF，用于以太网PDU会话、配置UPF的流量控制，将流量路由到正确的目的地、终止接口到策略控制功能、合法拦截(用于SM事件和LI系统的接口)、收费数据收集和支持计费接口、控制和协调UPF的收费数据收集、终止SM消息的SM部分、下行数据通知、AN特定SM信息的发起者，通过AMF通过N2发送到AN、确定会话的SSC模式。
应理解，上述终端设备以及NPN的独立组网方式中涉及的网元的示例仅仅是一种具体 的例子，不应构成具体限定。
当终端设备位于NPN网络覆盖的范围时，终端设备可以接入到NPN网络中的接入网设备1中。当终端设备位于PLMN网络覆盖的范围时，终端设备可以接入PLMN网络中的接入网设备2中。因此，终端设备从NPN网络覆盖的范围移动至PLMN网络覆盖的范围时，终端设备将从NPN网络中的接入网设备1移动至PLMN网络中的接入网设备2中。反之，终端设备也可以从PLMN网络中的接入网设备2移动至NPN网络中的接入网设备1中。下文中，将以终端设备移动前所在的网络为NPN网络，终端设备移动后所在的网络为PLMN网络为例进行说明。
在终端设备移动之前，终端设备位于NPN网络覆盖的范围，因此，可以在接入网设备1和DN2之间建立第一传输通道，以供接入网设备1通过第一传输通道将PLMN数据传输给DN2，或者，DN2通过第一传输通道将PLMN数据传输给接入网设备1。第一传输通道可以采用PLMN PDU会话资源，例如，如图2所示第一传输通道可以是途径接入网设备1、UPF1、DN1、N3IWF2、UPF2以及DN2的PLMN PDU会话资源(如图2中加粗虚线所示)。
在终端设备移动之后，在终端设备位于PLMN网络覆盖的范围，因此，可以在接入网设备2和DN2之间建立第二传输通道，以供接入网设备2通过第二传输通道将PLMN数据传输给DN2，或者，DN2通过第二传输通道将PLMN数据传输给接入网设备2。第二传输通道可以采用PLMN PDU会话资源，例如，如图3所示，第二传输通道可以是途径接入网设备2、UPF2、DN2的PLMN PDU会话资源(如图3中加粗虚线所示)。
在终端设备从NPN网络覆盖的范围移动到PLMN网络覆盖的范围时，终端设备从接入网设备1切换至接入网设备2，如果D2已经将PLMN数据发送给接入网设备1，但接入网设备1尚未将PLMN数据发送给终端设备，则接入网设备1可能无法将接收到的PLMN数据发送给终端设备。同理，在终端设备从NPN网络覆盖的范围移动到PLMN网络覆盖的范围时，终端设备从接入网设备1切换至接入网设备2，如果终端设备正在将PLMN数据发送给接入网设备1，接入网设备1接收到的PLMN数据可能是不连续的，此时，接入网设备1无法将不连续的PLMN数据发送给D2。
为了陈述方便，下文中将移动时，在上行方向上已经上行到接入网设备1，但是，无法上行到CN2的PLMN数据和在下行方向上已经下行到接入网设备1，但是，无法下行到终端设备的PLMN数据统称回传数据。将移动之后，在上行方向上已经上行到接入网设备2，准备上行到CN2的PLMN数据和在下行方向上已经下行到接入网设备2，准备下行到终端设备的PLMN数据统称新数据。
显然地，终端设备从PLMN网络中的接入网设备2移动至NPN网络中的接入网设备1也相类似，此处不再赘述。
本申请中，不限定UE从源网络向目标网络进行跨网移动的场景。例如，UE可以是在跨网小区重选过程中发生的移动，或者，UE是在跨网小区切换过程中发生移动等。
本申请中，UE从源网络移动到目标网络，也可以替代描述为：UE从源网络重选到目标网络、UE从源网络切换到目标网络、UE从源网络接入到目标网络等。
应当理解，本专利所涉及的小区重选与传统的空闲态UE进行小区重选不同，而是连接态的UE自主决定进行跨网小区“切换”，而非网络侧控制进行的小区“切换”，即，与传统 标准中描述的小区重选和切换过程都不完全一致，也可为其他术语，例如，跨网自切换。
应当理解，本专利同样适用于UE在PNI-NPN和SNPN之间的移动过程，也适用于UE在SNPN和SNPN之间的移动过程。
为了解决上述问题，需要在接入网设备1和接入网设备2之间建立数据回传通路，从而将回传数据从接入网设备1回传至接入网设备2。参见图4，图4是本实施例的数据回传通路建立方法的流程示意图，所述方法包括如下步骤：
S101：终端设备向AMF1发送移动通知。相应地，AMF1接收终端设备发送的移动通知。
在本申请具体的实施例中，移动通知用于通知AMF1终端设备已经或者将要从NPN网络中的接入网设备1移动至PLMN网络中的接入网设备2。所述移动通知携带原因值、移动的类型、移动前的位置信息、移动后的位置信息、QoS流标识(QoS Flow Identifier，QFI)、DRB标识(DRB ID)、DRB和QoS流的映射列表中的一种或者多种。原因值为终端设备发送通知信息的原因，例如，跨网移动，用SNPN、NPN、PLMN、SNPNtoPLMN、PLMNtoSNPN、NPNtoPLMN、PLMNtoNPN、PNI-NPNtoPLMN、PLMNtoPNI-NPN、SNPNtoSNPN、Non-3GPPtoPLMN、PLMNtoNon-3GPP、Non-3GPPtoNon-3GPP、或者InterNetwork-mobility标识。移动类型为用户从一种网络的小区移动接入到了另一个网络的小区，例如，从NPN到PLMN，用SNPN、NPN、PLMN、SNPNtoPLMN、PLMNtoSNPN、NPNtoPLMN、PLMNtoNPN、PNI-NPNtoPLMN、PLMNtoPNI-NPN、SNPNtoSNPN、Non-3GPPtoPLMN、PLMNtoNon-3GPP、Non-3GPPtoNon-3GPP、或者InterNetwork-mobility标识。移动前的位置信息为终端设备发生移动前所在的NPN网络的位置信息，例如，NPN网络标识(如，用公用陆地移动网标识(Public Land Mobile Network identifier,PLMN ID)和网络标识(Network identifier，NID)联合标识独立部署的NPN网络)、跟踪区域码(tracking area code，TAC)、NG-RAN cell ID、终端设备标识(UE ID)、NG-RAN node ID、所连接的N3IWF的地址信息(例如，N3IWF IP)等等。移动后的位置信息为终端设备发生移动后所在的PLMN网络的位置信息，例如，PLMN网络标识(Public Land Mobile Network identifier,PLMN ID)、跟踪区域码(tracking area code，TAC)、NG-RAN cell ID、终端设备标识(UE ID)、NG-RAN node ID、所连接的N3IWF的地址信息(例如，N3IWF IP)等。终端设备标识可以是C-RNTI、I-RATI、NG-RAN node UE NGAP ID等等。
S102：AMF1根据所述移动通知通过SMF1向UPF1发送回传通道建立通知。相应地，UPF1通过SMF1接收AMF1发送的回传通道建立通知。
在本申请具体的实施例中，回传通道建立通知用于通知UPF1建立所述接入网设备1至所述UPF1之间的第一NPN段数据回传通道。可选地，所述回传通道建立通知还可以携带终端设备移动之后所连接的N3IWF 1的地址信息以及需要进行数据回传的PDU Session ID，QFI和DRB ID等。
在本申请具体的实施例中，AMF1接收到移动通知之后，确定需要建立从接入网设备1至接入网设备2之间的数据回传通路，因此，AMF1通过SMF1向UPF1发送回传通道建立通知。
S103：UPF1根据所述回传通道建立通知为所述回传数据配置第一NPN段数据回传通 道的传输网络层信息。
在本申请具体的实施例中，传输网络层信息用于为第一NPN段数据回传通道配置参数。所述传输网络层信息可以包括上行转发用户面传输网络层信息(UL Forwarding UP TNL Information)和下行转发用户面传输网络层信息(DL Forwarding UP TNL Information)中的一种或者多种，所述上行转发用户面传输网络层信息可包括上行传输层地址(例如，端口IP地址)和上行GTP隧道端口标识(如，GTP-TEID，GTP-Tunnel Endpoint Identifier等)，所述下行转发用户面传输网络层信息可包括下行传输层地址(例如，端口IP地址)和下行GTP隧道端口标识(如，GTP-TEID，GTP-Tunnel Endpoint Identifier等)。
S104：UPF1向AMF1发送所述传输网络层信息。相应地，AMF1接收UPF1发送的所述传输网络层信息。
S105：AMF1向所述接入网设备1发送所述传输网络层信息。相应地，所述接入网设备1接收所述AMF1发送的所述传输网络层信息。
S106：如图5所示，PLMN网络中的接入网设备1、UPF1建立了从接入网设备1至UPF1的第一NPN段数据回传通道。
S107：如图5所示，PLMN网络中的接入网设备2、AMF2、UPF2以及NPN网络中的N3IWF 1共同建立从N3IWF 1->数据网络2->UPF 2->接入网设备2的第一PLMN段数据回传通道。
在本申请具体的实施例中，第一数据回传通道的建立可以是终端设备触发的，也可以是AMF1触发的。其中，终端设备触发是指终端设备向AMF1发送NAS信息以请求建立第一数据回传通道。AMF1触发是指AMF1基于移动通知中的内容建立第一数据回传通道。并且，所述AMF 1在S102已经告知了所述UPF1所述N3IWF 1的地址信息，UPF1和N3IWF1间建立了第二数据回传通道。将所述第一数据回传通道和所述第二数据回传通道拼接起来，就可以得到从接入网设备2至N3IWF 1之间的第一PLMN段数据回传通道。
在本申请具体的实施例中，第一PLMN段数据回传通道可以由建立的NPN PDU会话资源进行承载，也可以是建立的专门用于数据回传的PLMN段数据回传通道(专用数据回传通道)。可以理解的是，当第一PLMN段数据回传通道采用NPN PDU会话资源时，实际上建立了从终端设备至DN2之间的数据传输通道，因此，接入网设备2可以通过该NPN PDU会话资源与终端设备进行通信，当第一PLMN段数据回传通道采用专用数据回传通道时，实际上建立了从接入网设备2至UPF1之间的数据回传通道，接入网设备2不可以通过该专用数据回传通道与终端设备进行通信。
一种实现方式，当第一PLMN段数据回传通道采用NPN PDU会话资源时，第一PLMN段数据回传通道可以在终端设备成功移动到PLMN网络后建立，即，终端设备移动到PLMN网络后向AMF1发送NAS信息请求建立NPN PDU会话资源，请求信息中携带NPN PDU会话的标识(PDU Session ID)、PLMN PDU会话的标识列表、PLMN PDU会话所对应的回传数据信息、数据传输顺序信息、或NPN PDU会话资源建立的原因值。NPN PDU会话的标识和所述PLMN PDU会话的标识列表中的PLMN PDU会话标识用以指示所建立NPNPDU会话资源可以用于回传相应PLMN PDU会话数据。应当理解，NPN PDU会话资源也可以用于或者不用于传输相应NPN PDU会话数据。所述PLMN PDU会话所对应的回传数 据信息包括：PDU会话标识、QoS流标识、DRB标识、或DRB与QoS流的映射列表。所述数据传输顺序信息用以指示所述NPN PDU会话、PLMN PDU会话的数据的传输顺序，例如，用NPN PDU会话标识和PLMN PDU会话标识的顺序来指示传输相应数据的顺序，一个PDU会话的数据传输结束后，在数据末尾加上结束标记(end marker)，进而继续传输另一个PDU会话的数据。所述原因值用以指示终端设备请求建立NPN PDU会话的原因，例如，用SNPN、NPN、PLMN、SNPNtoPLMN、PLMNtoSNPN、NPNtoPLMN、PLMNtoNPN、PNI-NPNtoPLMN、PLMNtoPNI-NPN、SNPNtoSNPN、Non-3GPPtoPLMN、PLMNtoNon-3GPP、Non-3GPPtoNon-3GPP、或者InterNetwork-mobility标识原因值，用以指示终端设备跨网移动需要建立NPN PDU会话资源保持业务连续性。
接入网设备1和接入网设备2之间建立数据回传通路即为第一NPN段数据回传通道和第一PLMN段数据回传通道之和，也就是说，接入网设备1通过第一NPN段数据回传通道和第一PLMN段数据回传通道可以将回传数据传输给接入网设备2。
在接入网设备1和接入网设备2之间建立数据回传通路建立完成之后，接入网设备1可以通过第一NPN段数据回传通道将回传数据发送给UPF1，然后，UPF1通过第一PLMN段数据回传通道将回传数据发送给接入网设备2。
由于路径等外在原因，部分新数据(下文中的新数据主要是指这部分数据)可能比回传数据更早到达接入网设备了，所以，为了确保回传数据在被回传至接入网设备2之后，能够被正确地被接入网设备2上行到DN2或者下行到终端设备，终端设备还需要将回传数据信息分别发送给接入网设备1以及接入网设备2，以确保接入网设备1和接入网设备2之间的回传数据信息是统一的，并使得接入网设备2可以根据回传数据信息将回传数据和新数据正确地上行到DN2或者下行到终端设备。
参见图6，图6是本申请提供的一种回传数据信息的传输方法的流程示意图，所述回传数据信息的传输方法包括如下步骤：
S201：如图7所示，在终端设备从接入网设备1移动至接入网设备2之后，终端设备通过N1接口向AMF1发送回传数据信息。相应地，AMF1通过N1接口接收终端设备发送的回传数据信息。其中，N1接口是终端设备通过接入网设备2，UPF2、N3IWF1等网元与AMF1建立的接口。
在本申请具体的实施例中，回传数据信息携带以下一个或多个：NPN PDU会话的标识(PDU Session ID)、PLMN PDU会话的标识列表、PLMN PDU会话的回传数据信息、数据传输顺序信息、或NPN PDU会话资源建立的原因值。NPN PDU会话的标识和所述PLMN PDU会话的标识列表中的PLMN PDU会话标识用以指示所建立NPN PDU会话资源可以用于回传相应PLMN PDU会话数据。应当理解，NPN PDU会话资源也可以用于或者不用于传输相应NPN PDU会话数据。所述PLMN PDU会话的回传数据信息包括以下一个或多个：PDU会话标识、QoS流标识、DRB标识、或DRB与QoS流的映射列表。可选地，所述PLMN PDU会话的回传数据信息还可以包括需要携带DRB中的数据已发送情况，以保证无损移动，例如，携带上行链路PDCP-SN分组数据汇聚协议服务数据单元序列号(Packet Data Convergence Protocol Sequence Number，PDCP-SN)和HFN接收器状态信息(uplink PDCP-SN and HFN receiver status)以及下行链路PDCP SN和HFN发送器状态(downlink  PDCP SN and HFN transmitter status)信息等等。状态信息可以包括信元UL/DL COUNT Value、Transmit Status of UL PDCP SDUs以及Receive Status of DL PDCP SDUs等等中的一种或者多种。Transmit Status of UL PDCP SDUs用于反映对应的UL PDCP是否已经成功发出，如0表示对应的PDCP未成功发出，1表示对应的PDCP已成功发出。Receive Status of DL PDCP SDUs用于反映对应的DL PDCP是否已经成功接收，如0表示对应的PDCP未成功接收，1表示对应的PDCP已成功接收。所述数据传输顺序信息用以指示所述NPN PDU会话资源中传输所述回传的PLMN PDU会话的数据和传输新到达的NPN PDU会话的数据的先后顺序。例如，用NPN PDU会话标识和PLMN PDU会话标识的顺序来或者NPN PDU会话标识和PLMN PDU会话标识的顺序列表来指示传输相应数据的顺序，一个PDU会话的数据传输结束后，在数据末尾加上结束标记(end marker)，进而继续传输另一个PDU会话的数据。
所述原因值用以指示终端设备请求建立NPN PDU会话的原因，例如，用SNPN、NPN、PLMN、SNPNtoPLMN、PLMNtoSNPN、NPNtoPLMN、PLMNtoNPN、PNI-NPNtoPLMN、PLMNtoPNI-NPN、SNPNtoSNPN、Non-3GPPtoPLMN、PLMNtoNon-3GPP、Non-3GPPtoNon-3GPP、或者InterNetwork-mobility标识原因值，用以指示终端设备跨网移动需要建立NPN PDU会话资源保持业务连续性。
在本申请具体的实施例中，终端设备从本地获取存储在本地的回传数据信息，并通过N1接口向AMF1发送回传数据信息。
S202：如图7所示，AMF1将回传数据信息发送给接入网设备1。相应地，接入网设备1接收所述AMF1发送的回传数据信息。
可以理解的是，终端设备从接入网设备1移动至接入网设备2时，终端设备和接入网设备1之间的连接已经断开，终端设备和接入网设备1之间已经无法正常进行数据传输，终端设备和接入网设备2的连接已经建立，终端设备和接入网设备2之间可以正常进行数据传输。另外，如果接入网设备1和接入网设备2位于同一个网络类型中(例如，都位于PLMN网络时)，接入网设备1和接入网设备2之间可以具有直接连通的Xn接口，此时，接入网设备1和接入网设备2之间可以直接进行通信，但是，这里接入网设备1和接入网设备2分别位于两种不同的网络类型(NPN网络以及PLMN网络)中，因此，接入网设备1和接入网设备2之间不能直接进行通信。
终端设备不能直接和接入网设备1进行通信，所以，可以在终端设备和AMF1之间建立N1接口，终端设备可以通过N1接口向AMF1发送回传数据信息，然后，AMF1再将回传数据信息发送给接入网设备1。
S203：如图6和图7所示，终端设备将回传数据信息发送给接入网设备2。相应地，接入网设备2接收终端设备发送的回传数据信息。
在本申请具体的实施例中，如果第一PLMN段数据回传通道是由建立的NPN PDU会话资源进行承载，终端设备还可以将回传数据信息发送给接入网设备2。回传数据信息中可以携带上述所述信息。
在本申请具体的实施例中，由于终端设备已经移动到接入网设备2，因此，终端设备可直接将回传数据信息发送给接入网设备2。
可以理解，在步骤203中以终端设备直接将回传数据信息发送给接入网设备2为例进行说明，但是，终端设备也可以不直接将回传数据信息发送给接入网设备2，而是，终端设备先将回传数据信息通过NAS消息发送给AMF2，AMF2再将回传数据信息转发给接入网设备2。
参见图8，图8是本申请提供的一种回传数据信息的传输方法的流程示意图，所述回传数据信息的传输方法包括如下步骤：
S301：在终端设备从接入网设备1移动到接入网设备2之前，终端设备向接入网设备1发送准备切换通知。相应地，接入网设备1接收终端设备发送的准备切换通知。
S302：如图9所示，接入网设备1向终端设备发送回传数据信息。相应地，终端设备接收接入网设备1发送的回传数据信息。
在本申请具体的实施例中，回传数据信息携带以下一个或多个：NPN PDU会话的标识(PDU Session ID)、PLMN PDU会话的标识列表、PLMN PDU会话的回传数据信息、数据传输顺序信息、或NPN PDU会话资源建立的原因值。NPN PDU会话的标识和所述PLMN PDU会话的标识列表中的PLMN PDU会话标识用以指示所建立NPN PDU会话资源可以用于回传相应PLMN PDU会话数据。应当理解，NPN PDU会话资源也可以用于或者不用于传输相应NPN PDU会话数据。所述PLMN PDU会话的回传数据信息包括以下一个或多个：PDU会话标识、QoS流标识、DRB标识、或DRB与QoS流的映射列表。可选地，所述PLMN PDU会话的回传数据信息还可以包括需要携带DRB中的数据已发送情况，以保证无损移动，例如，携带上行链路PDCP-SN分组数据汇聚协议服务数据单元序列号(Packet Data Convergence Protocol Sequence Number，PDCP-SN)和HFN接收器状态信息(uplink PDCP-SN and HFN receiver status)以及下行链路PDCP-SN和HFN发送器状态(downlink PDCP SN and HFN transmitter status)信息等等。状态信息可以包括信元UL/DL COUNT Value、Transmit Status of UL PDCP SDUs以及Receive Status of DL PDCP SDUs等等中的一种或者多种。Transmit Status of UL PDCP SDUs用于反映对应的UL PDCP是否已经成功发出，如0表示对应的PDCP未成功发出，1表示对应的PDCP已成功发出。Receive Status of DL PDCP SDUs用于反映对应的DL PDCP是否已经成功接收，如0表示对应的PDCP未成功接收，1表示对应的PDCP已成功接收。所述数据传输顺序信息用以指示所述NPN PDU会话资源中传输所述回传的PLMN PDU会话的数据和传输新到达的NPN PDU会话的数据的先后顺序。例如，用NPN PDU会话标识和PLMN PDU会话标识的顺序来或者NPN PDU会话标识和PLMN PDU会话标识的顺序列表来指示传输相应数据的顺序，一个PDU会话的数据传输结束后，在数据末尾添加结束标记(end marker)，进而继续传输另一个PDU会话的数据。
所述原因值用以指示终端设备请求建立NPN PDU会话的原因，例如，用SNPN、NPN、PLMN、SNPNtoPLMN、PLMNtoSNPN、NPNtoPLMN、PLMNtoNPN、PNI-NPNtoPLMN、PLMNtoPNI-NPN、SNPNtoSNPN、Non-3GPPtoPLMN、PLMNtoNon-3GPP、Non-3GPPtoNon-3GPP、或者InterNetwork-mobility标识原因值，用以指示终端设备跨网移动需要建立NPN PDU会话资源保持业务连续性。
在本申请具体的实施例中，接入网设备1从本地获取存储在本地的回传数据信息，并 通过无线接口向终端设备发送回传数据信息。
S302：如图9所示，在终端设备从接入网设备1移动到接入网设备2之后，终端设备将回传数据信息发送给接入网设备2。相应地，接入网设备2接收所述终端设备发送的回传数据信息。
应理解，图6和图8所示的仅仅是回传数据信息发送给接入网设备1和接入网设备2的两种示例，不应该构成具体限定，例如，终端设备移动到第二接入网设备后，发送移动通知信息给AMF1，AMF1询问接入网设备1是否有数据要回传，如果接入网设备1需要回传数据，则接入网设备1将数据回传信息发送给AMF1，AMF1再分别将数据回传信息发送给终端设备和UPF1，或者，AMF1再分别将数据回传信息发送给终端设备和N3IWF1，终端设备再发送给接入网设备2。又例如，终端设备在从接入网设备1移动至接入网设备2之前，终端设备向接入网设备1发送移动通知给接入网设备1。接入网设备1将回传数据信息发送给终端设备，并且，接入网设备1将回传数据信息发送给AMF1。终端设备还把回传数据信息发送给接入网设备2，AMF1还可以将回传数据信息发送给UPF1或者N3IWF1。
从传输通道的角度来看，接入网设备2和终端设备之间用于传输回传数据和新数据的通道至少包括以下两种情况：
在第一种方式中，第一PLMN段数据回传通道为NPN PDU会话资源。此时，如图10中的虚线框所示，接入网设备2和终端设备之间存在两条传输回传数据和新数据的通道，其中，第一、接入网设备2可以利用图5所示的第一PLMN段数据回传通道(即NPN PDU会话资源)与终端设备进行通信，第二、接入网设备2可以利用图3所示的第二传输通道(即PLMN PDU会话资源)与终端设备进行通信。
由于需要在NPN PDU会话资源上传输PLMN PDU会话，接入网设备2需要将NPN PDU会话资源和所要回传的PLMN PDU会话之间的映射关系和用途告知终端设备，以告知终端设备在一个或多个NPN PDU会话资源上要传输一个或多个PLMN PDU会话的回传数据，其中，NPN PDU会话可以由以下一个或多个标识进行指示：NPN PDU Session ID、NPN DRB ID、QFI等，PLMN PDU会话可以由以下一个或多个标识进行指示：PLMN PDU Session ID、PLMN DRB ID、PLMN QFI等。可选的，接入网设备2需要将PLMN PDU会话资源和所要回传的PLMN PDU会话之间的映射关系和用途告知终端设备，以告知终端设备在一个或多个PLMN PDU会话资源上要传输一个或多个PLMN PDU会话的回传数据。
在第二种方式中，第一PLMN段数据回传通道为专用数据回传通道。此时，如图11的虚线方框所示，接入网设备2和终端设备之间只存在一条传输回传数据和新数据的通道，即，接入网设备2可以利用图3所示的第二传输通道(即PLMN PDU会话资源)与终端设备进行通信。
可以理解，上述接入网设备2和终端设备之间用于传输回传数据和新数据的通道仅仅是作为举例，不应构成具体限定。
从传输数据的粒度角度来看，接入网设备2和终端设备之间传输的回传数据粒度至少包括以下两种方式：
在第一种方式中，回传数据的粒度为PDU session粒度。当回传数据的粒度为PDU  session粒度时，接入网设备2收到的待回传信息中不包含PDCP-SN和HFN信息，为了保证接入网设备2和终端设备之间传输的回传数据和新数据的顺序是正确的，接入网设备2需要按照先后顺序进行传输。例如，由于回传数据的产生在新数据的产生之前(回传数据是终端设备移动前产生的数据，新数据是终端设备移动后产生的数据)，因此，接入网设备2需要先将回传数据发送给终端设备，然后，接入网设备2再将新数据发送给终端设备，从而保证终端设备接收回传数据和新数据的传输顺序是正确的。
在第二种方式中，回传数据和新数据的粒度为DRB粒度。当回传数据的粒度为PDU session粒度时，接入网设备2收到的待回传信息中不包含PDCP-SN和HFN信息，接入网设备2可以按照PDCP-SN和HFN信息对回传数据和新数据重新进行排序。因此，接入网设备2和终端设备之间传输的回传数据和新数据可以不按照顺序进行传输。例如，尽管回传数据的产生在新数据的产生之前(回传数据是终端设备移动前产生的数据，新数据是终端设备移动后产生的数据)，但是，接入网设备2可以将先接收到的新数据发送给终端设备，然后，再将后接收到的回传数据发送给终端设备。终端设备接收到新数据和回传数据之后，再按照顺序标记(例如，PDCP SN号)进行重新进行排序。但是，接入网设备2在接收到回传数据和新数据之后，需要正确地对回传数据和新数据进行排序，并按接收到的PDCP-SN和HFN信息打上顺序标记(例如，PDCP SN号)。
可以理解，上述接入网设备2和终端设备之间传输的回传数据和新数据粒度仅仅是作为举例，不应构成具体限定。
接入网设备2可以根据回传数据信息向终端设备传输回传数据和新数据，以及，接入网设备2可以根据回传数据信息向PLMN核心网的设备(例如，UPF2)传输回传数据和新数据。按照第一PLMN段数据回传通道和回传数据的粒度四种具体的组合，接入网设备2根据回传数据信息向终端设备传输回传数据和新数据，以及，接入网设备2可以根据回传数据信息向PLMN核心网的设备(例如，UPF2)传输回传数据和新数据方式至少包括以下几种：
PLMN PDU会话可以是终端设备与PLMN网络之间建立的PDU会话，PNN PDU会话可以是终端设备与所述NPN网络之间建立的PDU会话，为了简便起见，下面均简称为PLMN PDU会话以及PNN PDU会话。
第一种方式中，第一PLMN段数据回传通道为NPN PDU会话资源，回传数据的粒度是PDU session粒度。接入网设备2将NPN PDU会话资源和所要回传的PLMN PDU会话之间的映射关系和用途告知终端设备，以告知终端设备在一个或多个NPN PDU会话资源上要传输一个或多个PLMN PDU会话的回传数据，其中，NPN PDU会话可以由以下一个或多个标识进行指示：NPN PDU Session ID、NPN DRB ID、QFI等，PLMN PDU会话可以由以下一个或多个标识进行指示：PLMN PDU Session ID、PLMN DRB ID、PLMN QFI等。然后，接入网设备2先将从NPN PDU会话资源中接收到的待回传的PLMN PDU会话数据通过NPN PDU会话资源发送给终端设备，再将从PLMN PDU会话资源中接收到的新到达的PLMN PDU会话数据通过PLMN PDU会话资源发送给终端设备。终端设备将待回传的PLMN PDU会话数据和新到达的PLMN PDU会话数据按照上述顺序先后发送至终端设备的高层应用，并由高层应用解析出待回传的PLMN PDU会话数据和新到达的PLMN PDU 会话数据。或者，接入网设备2将通过NPN PDU会话资源和PLMN PDU会话资源(即，空口DRB资源)中的任一资源将待回传的PLMN PDU会话数据和新到达的PLMN PDU会话数据按照上述顺序先后发送至终端设备的高层应用，并由高层应用解析出待回传的PLMN PDU会话数据和新到达的PLMN PDU会话数据。其中，接入网设备2在发送待回传的PLMN PDU会话数据和新到达的PLMN PDU会话数据之前，向终端设备发送通知。所述发送通知用于指示发送的待回传的PLMN PDU会话数据和新到达的PLMN PDU会话数据所被承载的会话资源类型，所述资源类型为NPN PDU会话资源和PLMN PDU会话资源中的任一种，所述资源类型可以由PLMN PDU Session ID、PLMN DRB ID、NPN PDU Session ID、或NPN DRB ID标识。另外，接入网设备2也可以通过默认的资源类型发送待回传的PLMN PDU会话数据和新到达的PLMN PDU会话数据，所述默认的资源类型为NPN PDU会话资源、或PLMN PDU会话资源。上行方向的用户面数据和下行方向的用户面数据的传输方式相类似，只需要将接收端从终端设备替换为PLMN核心网的设备(例如，UPF2)即可。一个PLMN PDU会话的回传数据在会话资源中发送结束后，在数据末尾添加结束标记(end marker)，进而继续传输另一个PLMN PDU会话的回传数据或者PLMN PDU会话新到达的数据或者NPN PDU会话新到达的数据。可选的，接入网设备2在发送数据给终端设备之前，可先将数据传输顺序信息告知终端设备，所述数据传输顺序信息用以指PDU会话资源中传输回传的PLMN PDU会话的数据和PLMN PDU会话新到达的数据或者NPN PDU会话的数据的先后顺序。例如，用NPN PDU会话标识和PLMN PDU会话标识的顺序或者NPN PDU会话标识和PLMN PDU会话标识的顺序列表来指示传输相应数据的顺序，一个PDU会话的数据传输结束后，在数据末尾添加结束标记(end marker)，进而继续传输另一个PDU会话的数据。
第二种方式中，第一PLMN段数据回传通道是建立的专门用于数据回传的PLMN段数据回传通道(专用数据回传通道)，回传数据的粒度是PDU session粒度。对于下行方向的用户面数据：接入网设备2先将从专用数据回传通道中接收到的待回传的PLMN PDU会话数据通过PLMN PDU会话资源发送给终端设备，再将从PLMN PDU会话资源中接收到的新到达的PLMN PDU会话数据通过PLMN PDU会话资源发送给终端设备。终端设备将待回传的PLMN PDU会话数据和新到达的PLMN PDU会话数据按照上述顺序先后发送至终端设备的高层应用，并由高层应用解析出待回传的PLMN PDU会话数据和新到达的PLMN PDU会话数据。上行方向的用户面数据和下行方向的用户面数据的传输方式相类似，只需要将接收端从终端设备替换为PLMN核心网的设备(例如，UPF2)即可。
第三种方式中，第一PLMN段数据回传通道承载在NPN PDU会话资源，回传数据的粒度是DRB粒度。接入网设备2对从NPN PDU会话资源中接收的待回传的PLMN PDU会话数据和从PLMN PDU会话资源中接收到的新到达的PLMN PDU会话数据进行PDCP编号、重排序和传输。在传输时，不应传送任何PDCP SN值低于所提供的UL PDCP SN值的上行数据，并且应使用提供的DL PDCP SN值作为要发送的尚未分配PDCP-SN的第一个下行数据包的PDCP SN值，以进行数据的按序传输，避免数据的重复发送。对于下行方向的用户面数据：接入网设备2将NPN PDU会话资源和所要回传的PLMN PDU会话之间的映射关系和用途告知终端设备，以告知终端设备在一个或多个NPN PDU会话资源上要传 输一个或多个PLMN PDU会话的回传数据，其中，NPN PDU会话可以由以下一个或多个标识进行指示：NPN PDU Session ID、NPN DRB ID、QFI等，PLMN PDU会话可以由以下一个或多个标识进行指示：PLMN PDU Session ID、PLMN DRB ID、PLMN QFI等。然后，接入网设备2将从NPN PDU会话资源中接收到的待回传的PLMN PDU会话数据通过NPN DRB会话资源发送给终端设备，将PLMN PDU会话资源中接收到的新到达的PLMN PDU会话数据通过PLMN DRB会话资源发送给终端设备(两路数据可以不分先后顺序进行传输)，终端设备将待回传的PLMN PDU会话数据和新到达的PLMN PDU会话数据按照上述PDCP SN编号发送至终端设备的高层应用，由高层应用解析出待回传的PLMN PDU会话数据和新到达的PLMN PDU会话数据。或者，接入网设备2也可以只通过NPN DRB资源和PLMN DRB资源的其中某一个资源将从NPN PDU会话资源中接收到的待回传的PLMN PDU会话数据和从PLMN PDU会话资源中接收到的新到达的PLMN PDU会话数据发送给终端，终端并将待回传的PLMN PDU会话数据和新到达的PLMN PDU会话数据按照上述PDCP SN编号发送至高层，由高层解析出待回传的PLMN PDU会话数据和新到达的PLMN PDU会话数据，其中，接入网设备2在发送待回传的PLMN PDU会话数据和新到达的PLMN PDU会话数据之前，告知终端要只用NPN DRB资源和PLMN DRB资源的中的哪一个资源发送待回传的PLMN PDU会话数据和新到达的PLMN PDU会话数据(也可以默认用哪一个资源发送数据，从而不用明确告知终端)，所述资源类型可以由PLMN PDU Session ID、PLMN DRB ID、NPN PDU Session ID、或NPN DRB ID标识。上行方向的用户面数据和下行方向的用户面数据的传输方式相类似，只需要将接收端从终端设备替换为PLMN核心网的设备(例如，UPF2)，此外，接入网设备2通过PLMN PDU会话资源/NPN PDU会话资源，而不是PLMN DRB会话资源/NPN DRB会话资源将待回传的PLMN PDU会话数据和新到达的PLMN PDU会话数据发送给PLMN核心网的设备。
第四种方式中，第一PLMN段数据回传通道是建立的专门用于数据回传的PLMN段数据回传通道(专用数据回传通道)，回传数据的粒度是DRB粒度。接入网设备2对从NPN PDU会话资源接收的待回传的PLMN PDU会话数据和从PLMN PDU会话资源接收到的新到达的PLMN PDU会话数据进行PDCP编号、重排序和传输。在传输时，不应传送任何PDCP SN值低于所提供的UL PDCP SN值的上行数据，并且应使用提供的DL PDCP SN值作为要发送的尚未分配PDCP-SN的第一个下行数据包的PDCP SN值，以进行数据的按序传输，避免数据的重复发送。对于下行方向的用户面数据：接入网设备2通过PLMN PDU会话资源将从专用回传通道中接收到的待回传的PLMN PDU会话数据和从PLMN PDU会话资源中接收到的新到达的PLMN PDU会话数据通过PLMN DRB资源发送给终端设备，终端设备将待回传的PLMN PDU会话数据和新到达的PLMN PDU会话数据按照上述PDCP编号发送至终端设备的高层，由终端设备的高层应用解析出待回传的PLMN PDU会话数据和新到达的PLMN PDU会话数据。上行方向的用户面数据和下行方向的用户面数据的传输方式相类似，只需要将接收端从终端设备替换为PLMN核心网的设备(例如，UPF2)，此外，接入网设备2通过PLMN PDU会话资源/NPN PDU会话资源，而不是PLMN DRB会话资源/NPN DRB会话资源将待回传的PLMN PDU会话数据和新到达的PLMN PDU会话数据发送给PLMN核心网的设备。
在接入网设备2可以根据回传数据信息向终端设备传输回传数据和新数据之前，接入网设备2可以向终端设备发送指示信息，所述指示信息告知所述终端设备接入网设备2将通过何种方式向终端设备发送回传数据以及新数据。当然，接入网设备2也可以不向终端设备发送指示信息，而是通过默认的方式向终端设备发送回传数据以及新数据。
为了方便陈述，上述内容中将数据回传通道的建立过程、回传数据信息的传输过程、回传数据进行回传过程等分别进行了陈述，在实际应用中，这些过程通常都是交织在一起的。下面将结合两个具体的实施例说明本申请的数据回传方法。其中，第一个实施例是发生在终端设备从源网络中的接入网设备1移动到目的网络中的接入网设备2之后，第二个实施例发生在终端设备从源网络中的接入网设备1移动到目的网络中的接入网设备2之前，下面将分别进行详细的介绍。
参见图12，图12是本申请提出的第一实施例的目标网络的数据回传方法的交互图。结合图1所示的NPN独立组网方式，以源网络为NPN网络，目的网络为PLMN网络，目标网络数据为PLMN数据为例，本实施例的数据回传方法包括如下步骤：
S401：在终端设备从NPN网络中的接入网设备1移动至PLMN网络中的接入网设备2后，终端设备建立与AMF1之间的N1接口。其中，N1接口是终端设备通过接入网设备2，UPF2、N3IWF1等网元与AMF1建立的接口。
S402：终端设备向AMF1发送移动通知信息。相应地，AMF1接收终端设备发送的移动通知信息。
在本申请具体的实施例中，移动通知信息用于通知AMF1终端设备已经从NPN网络中的接入网设备1移动至PLMN网络中的接入网设备2。所述移动通知信息携带以下的一个或多个：原因值、移动的类型、移动前的位置信息、移动后的位置信息。原因值为终端设备发送通知消息的原因，例如，跨网移动。移动类型为用户从一种网络的小区移动接入到了另一个网络的小区，例如，从NPN到PLMN。移动前的位置信息为终端设备发生移动前所在的NPN网络的位置信息，例如，NPN网络标识(如，用公用陆地移动网标识(Public Land Mobile Network identifier,PLMN ID)和网络标识(Network identifier，NID)联合标识独立部署的NPN网络)、跟踪区域码(tracking area code，TAC)、NG-RAN cell ID、终端设备标识(UE ID)、NG-RAN node ID、所连接的N3IWF的地址信息(例如，N3IWF IP)等。移动后的位置信息为终端设备发生移动后所在的PLMN网络的位置信息，例如，PLMN网络标识(Public Land Mobile Network identifier,PLMN ID)、跟踪区域码(tracking area code，TAC)、NG-RAN cell ID、终端设备标识(UE ID)、NG-RAN node ID、所连接的N3IWF的地址信息(例如，N3IWF IP)等等。终端设备标识可以是C-RNTI、I-RATI、NG-RAN node UE NGAP ID、UE IP地址、RAN UE ID等等。
所述原因值用以指示终端设备发送通知消息的原因，例如，当源网络和目标网络为不同的实现方式时，用SNPN、NPN、PLMN、SNPNtoPLMN、PLMNtoSNPN、NPNtoPLMN、PLMNtoNPN、PNI-NPNtoPLMN、PLMNtoPNI-NPN、SNPNtoSNPN、Non-3GPPtoPLMN、PLMNtoNon-3GPP、Non-3GPPtoNon-3GPP、或者InterNetwork-mobility标识原因值，用以指示因终端设备跨网移动而发送的通知消息。应理解，上述几种可能的情况，只是举例的形式说明原因值可能的表现形式，对本申请的保护范围不构成任何的限定，本申请中对于 原因值不再赘述。
S403：终端设备通过所述N1接口向AMF1发送回传数据信息。相应地，AMF1通过N1接口接收终端设备发送的回传数据信息。
在本申请具体的实施例中，回传数据信息携带以下一个或多个：NPN PDU会话的标识(PDU Session ID)、PLMN PDU会话的标识列表、PLMN PDU会话的回传数据信息、数据传输顺序信息、或NPN PDU会话资源建立的原因值。NPN PDU会话的标识和所述PLMN PDU会话的标识列表中的PLMN PDU会话标识用以指示所建立NPN PDU会话资源可以用于回传相应PLMN PDU会话数据。应当理解，NPN PDU会话资源也可以用于或者不用于传输相应NPN PDU会话数据。所述PLMN PDU会话的回传数据信息包括以下一个或多个：PDU会话标识、QoS流标识、DRB标识、或DRB与QoS流的映射列表。可选地，所述PLMN PDU会话的回传数据信息还可以包括需要携带DRB中的数据已发送情况，以保证无损移动，例如，携带上行链路PDCP-SN分组数据汇聚协议服务数据单元序列号(Packet Data Convergence Protocol Sequence Number，PDCP-SN)和HFN接收器状态信息(uplink PDCP-SN and HFN receiver status)以及下行链路PDCP-SN和HFN发送器状态(downlink PDCP SN and HFN transmitter status)信息等等。状态信息可以包括信元UL/DL COUNT Value、Transmit Status of UL PDCP SDUs以及Receive Status of DL PDCP SDUs等等中的一种或者多种。Transmit Status of UL PDCP SDUs用于反映对应的UL PDCP是否已经成功发出，如0表示对应的PDCP未成功发出，1表示对应的PDCP已成功发出。Receive Status of DL PDCP SDUs用于反映对应的DL PDCP是否已经成功接收，如0表示对应的PDCP未成功接收，1表示对应的PDCP已成功接收。所述数据传输顺序信息用以指示所述NPN PDU会话资源中传输所述回传的PLMN PDU会话的数据和传输新到达的NPN PDU会话的数据的先后顺序。例如，用NPN PDU会话标识和PLMN PDU会话标识的顺序来或者NPN PDU会话标识和PLMN PDU会话标识的顺序列表来指示传输相应数据的顺序，一个PDU会话的数据传输结束后，在数据末尾添加结束标记(end marker)，进而继续传输另一个PDU会话的数据。
所述原因值用以指示终端设备请求建立NPN PDU会话的原因，例如，用SNPN、NPN、PLMN、SNPNtoPLMN、PLMNtoSNPN、NPNtoPLMN、PLMNtoNPN、PNI-NPNtoPLMN、PLMNtoPNI-NPN、SNPNtoSNPN、Non-3GPPtoPLMN、PLMNtoNon-3GPP、Non-3GPPtoNon-3GPP、或者InterNetwork-mobility标识原因值，用以指示终端设备跨网移动需要建立NPN PDU会话资源保持业务连续性。
在本申请具体的实施例中，终端设备从本地获取回传数据信息之后，需要分别发送给接入网设备1以及接入网设备2，从而使得接入网设备1和接入网设备2中的回传数据信息能够进行对齐。
S404：AMF1将根据移动通知将回传数据信息以及移动通知信息发送给接入网设备1。相应地，接入网设备1接收所述AMF1根据移动通知发送的回传数据信息以及移动通知信息。
在本申请具体的实施例中，所述回传数据信息可以通过无线接入网状态转移信令(RAN Status Transfer)携带等。可选地，AMF1还可以将终端设备的移动前和/或移动后的位置信 息发送给接入网设备1，其中，移动后的位置信息可以包括终端设备移动后所连接的N3IWF的地址信息(例如，NPN-N3IWF IP)。其中，所述终端设备移动后所连接的N3IWF的地址信息还可以用于通知所述接入网设备1将数据回传给终端设备移动后所连接的N3IWF的地址信息。
在本申请具体的实施例中，AMF1可以根据移动前的位置信息，找到接入网设备1。
S405：AMF1向N3IWF 1发送所述回传数据信息。相应地，N3IWF 1接收AMF1发送的所述回传数据信息。
S406：AMF1通过SMF1向UPF1发送回传通道建立通知。相应地，UPF1通过SMF1接收AMF1发送的回传通道建立通知。
在本申请具体的实施例中，回传通道建立通知用于通知UPF1建立所述接入网设备1至所述UPF1之间的第一NPN段数据回传通道。所述回传通道建立通知包含所述回传数据信息。例如，所述回传通道建立通知还可以携带终端设备移动之后所连接的N3IWF的地址信息以及需要进行数据回传的PDU Session ID，QFI和DRB ID等。
S407：UPF1根据所述回传通道建立通知为所述回传数据配置第一NPN段数据回传通道的传输网络层信息。
在本申请具体的实施例中，传输网络层信息用于为第一NPN段数据回传通道配置参数。所述传输网络层信息可以包括上行转发用户面传输网络层信息(UL Forwarding UP TNL Information)和下行转发用户面传输网络层信息(DL Forwarding UP TNL Information)中的一种或者多种，所述上行转发用户面传输网络层信息可包括上行传输层地址(例如，端口IP地址)和上行GTP隧道端口标识(如，GTP-TEID，GTP-Tunnel Endpoint Identifier等)，所述下行转发用户面传输网络层信息可包括下行传输层地址(例如，端口IP地址)和下行GTP隧道端口标识(如，GTP-TEID，GTP-Tunnel Endpoint Identifier等)。
S408：UPF1向AMF1发送所述传输网络层信息。相应地，AMF1接收UPF1发送的所述传输网络层信息。
S409：AMF1向所述接入网设备1发送所述传输网络层信息。相应地，所述接入网设备1接收所述AMF1发送的所述传输网络层信息。
在本申请具体的实施例中，在所述接入网设备1接收到所述传输网络层信息之后，UPF1和所述接入网设备1建立了从UPF1至接入网设备1的第一数据回传通道，并且，所述AMF 1在S406已经告知了所述UPF1所述N3IWF 1的地址信息，UPF1和N3IWF 1间建立了第二数据回传通道。将所述第一数据回传通道和所述第二数据回传通道拼接起来，就可以得到从接入网设备1至N3IWF 1之间的第一NPN段数据回传通道。
S410：接入网设备1将回传数据发送给UPF1。相应地，UPF1接收接入网设备1发送的回传数据。
S411：UPF1将回传数据发送给N3IWF 1。相应地，N3IWF 1接收UPF1发送的回传数据。
S412：PLMN网络中的接入网设备2、AMF2、UPF2、SMF2以及NPN网络中的N3IWF 1共同建立从N3IWF 1->数据网络2->UPF 2->接入网设备2的第一PLMN段数据回传通道。
在本申请具体的实施例中，第一PLMN段数据回传通道的建立可以是终端设备触发的， 也可以是AMF1触发的。其中，终端设备触发是指终端设备向AMF1发送NAS信息以请求建立第一PLMN段数据回传通道。AMF1触发是指AMF1基于移动通知中的内容建立第一PLMN段数据回传通道。
在本申请具体的实施例中，第一PLMN段数据回传通道可以由建立的NPN PDU会话资源进行承载，也可以是建立的专门用于数据回传的PLMN段数据回传通道(专用数据回传通道)。
在本申请具体的实施例中，第一NPN段数据回传通道和第一PLMN段数据回传通道构成了从接入网设备1至接入网设备2之间的数据回传通道。
S413：可选地，终端设备将回传数据信息发送给接入网设备2。相应地，接入网设备2接收终端设备发送的回传数据信息。
回传数据信息中包括以下一个或者多个：NPN PDU会话的标识(PDU Session ID)、PLMN PDU会话的标识列表、PLMN PDU会话的回传数据信息、数据传输顺序信息、或NPN PDU会话资源建立的原因值。NPN PDU会话的标识和所述PLMN PDU会话的标识列表中的PLMN PDU会话标识用以指示所建立NPN PDU会话资源可以用于回传相应PLMN PDU会话数据。应当理解，NPN PDU会话资源也可以用于或者不用于传输相应NPN PDU会话数据。所述PLMN PDU会话的回传数据信息包括以下一个或多个：PDU会话标识、QoS流标识、DRB标识、或DRB与QoS流的映射列表。可选地，所述PLMN PDU会话的回传数据信息还可以包括需要携带DRB中的数据已发送情况，以保证无损移动，例如，携带上行链路PDCP-SN分组数据汇聚协议服务数据单元序列号(Packet Data Convergence Protocol Sequence Number，PDCP-SN)和HFN接收器状态信息(uplink PDCP-SN and HFN receiver status)以及下行链路PDCP-SN和HFN发送器状态(downlink PDCP SN and HFN transmitter status)信息等等。状态信息可以包括信元UL/DL COUNT Value、Transmit Status of UL PDCP SDUs以及Receive Status of DL PDCP SDUs等等中的一种或者多种。Transmit Status of UL PDCP SDUs用于反映对应的UL PDCP是否已经成功发出，如0表示对应的PDCP未成功发出，1表示对应的PDCP已成功发出。Receive Status of DL PDCP SDUs用于反映对应的DL PDCP是否已经成功接收，如0表示对应的PDCP未成功接收，1表示对应的PDCP已成功接收。所述数据传输顺序信息用以指示所述NPN PDU会话资源中传输所述回传的PLMN PDU会话的数据和传输新到达的NPN PDU会话的数据的先后顺序。例如，用NPN PDU会话标识和PLMN PDU会话标识的顺序来或者NPN PDU会话标识和PLMN PDU会话标识的顺序列表来指示传输相应数据的顺序，一个PDU会话的数据传输结束后，在数据末尾添加结束标记(end marker)，进而继续传输另一个PDU会话的数据。
所述原因值用以指示终端设备请求建立NPN PDU会话的原因，例如，用SNPN、NPN、PLMN、SNPNtoPLMN、PLMNtoSNPN、NPNtoPLMN、PLMNtoNPN、PNI-NPNtoPLMN、PLMNtoPNI-NPN、SNPNtoSNPN、Non-3GPPtoPLMN、PLMNtoNon-3GPP、Non-3GPPtoNon-3GPP、或者InterNetwork-mobility标识原因值，用以指示终端设备跨网移动需要建立NPN PDU会话资源保持业务连续性。
在本申请具体的实施例中，如果第一PLMN段数据回传通道是由建立的NPN PDU会话资源进行承载，在建立第一PLMN段数据回传通道时，终端设备还可以将回传数据信息 发送给接入网设备2。由于NPN PDU会话资源是承载在PLMN PDU会话资源上的，所以在建立用于承载NPN PDU会话的PLMN PDU会话资源的工程中，终端设备可将回传数据信息直接发送给接入网设备2，或者，终端设备将回传数据信息发送给AMF2，AMF2进而转发给接入网设备2。
S414：N3IWF 1经数据网络2、UPF 2的第一PLMN段数据回传通道将回传数据发送接入网设备2。
S415：PLMN网络中的接入网设备2、UPF2、DN2为终端设备建立PLMN PDU会话资源以传输PLMN PDU会话新数据。
S416：接入网设备2可以根据回传数据信息向终端设备传输回传数据和新数据，或者，接入网设备2可以根据回传数据信息向第二UPF传输回传数据和新数据。
在本申请具体的实施例中，接入网设备2根据回传数据信息向终端设备传输回传数据和新数据，以及，接入网设备2根据回传数据信息向PLMN核心网的设备(例如，UPF2)传输回传数据和新数据的方式已经在上文中进行了详细的介绍，具体请参见上文以及相关内容，此处不作具体介绍。
对应图12所示的实施例，下面将详细介绍图12所示的实施例的各种替代方案。
(1)图12所示的实施例中，在步骤S413中终端设备将回传数据信息发送给接入网设备2为例进行说明，但是，在实际应用中，该步骤可以发生S403至S415之间的任意位置，此处不作具体限定。另外，终端设备也可以不直接将回传数据信息发送给接入网设备2，而是，终端设备先将回传数据信息通过NAS消息发送给AMF2，AMF2再将回传数据信息转发给接入网设备2。或者，AMF1接收到所述终端设备发送的移动通知之后，AMF1向接入网设备1发送移动通知。接入网设备1接收到移动通知之后，接入网设备1从本地获取回传数据信息向AMF1发送回传数据信息。AMF1接收到回传数据信息之后，向终端设备发送回传数据信息，终端设备收到回传数据信息之后，向接入网设备2发送回传数据信息。
(2)图12所示的实施例中，在步骤405至步骤S406之间，N3IWF 1可以配置回传隧道传输网络层信息。其中，回传隧道传输网络层信息为N3IWF侧的回传隧道端口，例如，N3IWF的IP地址。然后，N3IWF将回传隧道传输网络层信息发送给AMF1，AMF1在步骤S406中将回传隧道信息通过SMF1发送给UPF1。此时，在步骤S406中可以不用再额外携带N3IWF的IP地址。
(3)图12所示的实施例中，在步骤S412中，PLMN段数据回传通道可以是用于进行数据回传的特殊的NPN PDU会话隧道。在建立该NPN PDU会话隧道时，AMF2可以发送隧道标识或指示信息等信息以通知接入网设备2、UPF2、SMF2该NPN PDU会话隧道用于进行数据回传。
(4)图12所示的实施例中，步骤S403终端设备通过所述N1接口向AMF1发送移动通知可以替换为：AMF1告知接入网设备1终端设备已经发生移动，并将终端设备的标识和原因值发送给接入网设备1。接入网设备1通知AMF1建立NPN段数据回传通道，并将回传数据信息发送给AMF1。AMF1将回传数据信息发送给终端设备。
(5)图12所示的实施例中，步骤S412可以发生S401至S415之间的任意位置，此处不作具体限定。
(6)图12所示的实施例中，当第一PLMN段数据回传通道为NPN PDU会话资源时，步骤S414中的回传数据包括两个IPsec报头。其中，回传数据发送至接入网设备1时携带了第一IPsec报头，然后，接入网设备1将回传数据发送至N3IWF2时，N3IWF2为回传数据添加了第二IPsec报头，然后，将添加了第二IPsec报头的回传数据发送给接入网设备2。因此，终端设备在解析接入网设备2发送给终端设备的回传数据时，需要进行两次IPsec报头。
(7)步骤S410和步骤S411也可以在S412之后。
(8)步骤S402和步骤S403可以合并为同一条信息。
参见图13，图13是本申请提出的第二种目标网络的数据回传方法的交互图。结合图13所示的NPN独立组网方式，以源网络为NPN网络，目的网络为PLMN网络，源网络数据为PLMN数据为例，本实施例的数据回传方法包括如下步骤：
S501：在终端设备接入到所述源网络的接入网设备1的情况下，终端设备向接入网设备1发送准备移动通知信息。相应地，接入网设备1接收终端设备发送的准备移动通知信息。
在本申请具体的实施例中，准备移动通知用于通知所述接入网设备1所述终端设备准备从源网络的接入网设备1移动至目的网络的接入网设备2。
所述移动通知携带以下的一个或多个：原因值、移动的类型、移动后的位置信息(即，目标网络位置信息)。原因值为终端设备发送通知消息的原因，例如，跨网移动。移动类型为用户从一种网络的小区移动接入到了另一个网络的小区，例如，从NPN到PLMN。移动后的位置信息为终端设备发生移动后所在的PLMN网络的位置信息，例如，PLMN网络标识(Public Land Mobile Network identifier,PLMN ID)、跟踪区域码(tracking area code，TAC)、NG-RAN cell ID、终端设备标识(UE ID)、NG-RAN node ID、所连接的N3IWF的地址信息(例如，N3IWF IP)等等。
所述原因值用以指示终端设备发送通知消息的原因，例如，当源网络和目标网络为不同的实现方式时，用SNPN、NPN、PLMN、SNPNtoPLMN、PLMNtoSNPN、NPNtoPLMN、PLMNtoNPN、PNI-NPNtoPLMN、PLMNtoPNI-NPN、SNPNtoSNPN、Non-3GPPtoPLMN、PLMNtoNon-3GPP、Non-3GPPtoNon-3GPP、或者InterNetwork-mobility标识原因值，用以指示因终端设备跨网移动而发送的通知消息。应理解，上述几种可能的情况，只是举例的形式说明原因值可能的表现形式，对本申请的保护范围不构成任何的限定，本申请中对于原因值不再赘述。
S502：接入网设备1根据所述准备移动通知向所述终端设备发送回传数据信息。相应地，所述终端设备接收接入网设备1根据所述准备移动通知发送的回传数据信息。
在本申请具体的实施例中，回传数据信息携带以下一个或多个：PLMN PDU会话的回传数据信息、原因值。所述PLMN PDU会话的回传数据信息包括以下一个或多个：PDU会话标识、QoS流标识、DRB标识、或DRB与QoS流的映射列表。可选地，所述PLMN PDU会话的回传数据信息还可以包括需要携带DRB中的数据已发送情况，以保证无损移动，例如，携带上行链路PDCP-SN分组数据汇聚协议服务数据单元序列号(Packet Data Convergence Protocol Sequence Number，PDCP-SN)和HFN接收器状态信息(uplink  PDCP-SN and HFN receiver status)以及下行链路PDCP-SN和HFN发送器状态(downlink PDCP SN and HFN transmitter status)信息等等。状态信息可以包括信元UL/DL COUNT Value、Transmit Status of UL PDCP SDUs以及Receive Status of DL PDCP SDUs等等中的一种或者多种。Transmit Status of UL PDCP SDUs用于反映对应的UL PDCP是否已经成功发出，如0表示对应的PDCP未成功发出，1表示对应的PDCP已成功发出。Receive Status of DL PDCP SDUs用于反映对应的DL PDCP是否已经成功接收，如0表示对应的PDCP未成功接收，1表示对应的PDCP已成功接收。所述原因值用以指示终端设备发送通知信息的原因，例如，用SNPN、NPN、PLMN、SNPNtoPLMN、PLMNtoSNPN、NPNtoPLMN、PLMNtoNPN、PNI-NPNtoPLMN、PLMNtoPNI-NPN、SNPNtoSNPN、Non-3GPPtoPLMN、PLMNtoNon-3GPP、Non-3GPPtoNon-3GPP、或者InterNetwork-mobility标识原因值，用以指示终端设备因跨网移动而发送移动通知信息。
S503：接入网设备1将回传数据信息发送给AMF1。相应地，AMF1接收所述接入网设备1发送的回传数据信息。所述待回传信息包括上述S502中所述信息。
在本申请具体的实施例中，接入网设备1还可以将终端设备移动后所要连接的N3IWF的地址信息例如，N3IWF1 IP发送给AMF1。
S504：AMF1向N3IWF 1发送所述回传数据信息。相应地，N3IWF 1接收AMF1发送的所述回传数据信息。
S505：AMF1通过SMF1向UPF1发送回传通道建立通知。相应地，UPF1通过SMF1接收AMF1发送的回传通道建立通知。
在本申请具体的实施例中，回传通道建立通知用于通知UPF1建立所述接入网设备1至所述UPF1之间的第一NPN段数据回传通道。可选地，所述回传通道建立通知可以携带上述回传数据信息，还可以携带终端设备移动到第二网络后所连接的N3IWF的地址信息。
S506：UPF1根据所述回传通道建立通知为所述回传数据配置第一NPN段数据回传通道的传输网络层信息。
在本申请具体的实施例中，传输网络层信息用于为第一NPN段数据回传通道配置参数。所述传输网络层信息可以包括上行转发用户面传输网络层信息(UL Forwarding UP TNL Information)和下行转发用户面传输网络层信息(DL Forwarding UP TNL Information)中的一种或者多种，所述上行转发用户面传输网络层信息可包括上行传输层地址(例如，端口IP地址)和上行GTP隧道端口标识(如，GTP-TEID，GTP-Tunnel Endpoint Identifier等)，所述下行转发用户面传输网络层信息可包括下行传输层地址(例如，端口IP地址)和下行GTP隧道端口标识(如，GTP-TEID，GTP-Tunnel Endpoint Identifier等)。
S507：UPF1向AMF1发送所述传输网络层信息。相应地，AMF1接收UPF1发送的所述传输网络层信息。
S508：AMF1向所述接入网设备1发送所述传输网络层信息。相应地，所述接入网设备1接收所述AMF1发送的所述传输网络层信息。
在本申请具体的实施例中，在所述接入网设备1接收到所述传输网络层信息之后，UPF1和所述接入网设备1建立了从接入网设备1至UPF1的第一数据回传通道，并且，所述AMF 1在S505已经告知了所述UPF1所述N3IWF 1的地址信息，UPF1和N3IWF 1间建立了第 二数据回传通道。将所述第一数据回传通道和所述第二数据回传通道拼接起来，就可以得到从接入网设备1至N3IWF 1之间的第一NPN段数据回传通道。
S509：接入网设备1将回传数据发送给UPF1。相应地，UPF1接收接入网设备1发送的回传数据。
S510：UPF1将回传数据发送给N3IWF 1。相应地，N3IWF 1接收UPF1发送的回传数据。
S511：PLMN网络中的接入网设备2、AMF2、UPF2、SMF2以及NPN网络中的N3IWF 1共同建立从N3IWF 1->数据网络2->UPF 2->接入网设备2的第一PLMN段数据回传通道。
在本申请具体的实施例中，第一PLMN段数据回传通道的建立可以是终端设备触发的，也可以是AMF1触发的。其中，终端设备触发是指终端设备向AMF1发送NAS信息以请求建立第一PLMN段数据回传通道。AMF1触发是指AMF1基于移动通知中的内容建立第一PLMN段数据回传通道。
在本申请具体的实施例中，第一PLMN段数据回传通道可以由建立的NPN PDU会话资源进行承载，也可以是建立的专门用于数据回传的PLMN段数据回传通道(专用数据回传通道)。
在本申请具体的实施例中，第一NPN段数据回传通道和第一PLMN段数据回传通道构成了从接入网设备1至接入网设备2之间的数据回传通道。
S512：可选地，终端设备将回传数据信息发送给接入网设备2。相应地，接入网设备2接收终端设备发送的回传数据信息。
在本申请具体的实施例中，如果PLMN段数据回传通道是由建立的NPN PDU会话资源进行承载，在建立用于承载NPN PDU会话的PLMN PDU会话资源时，终端设备还可以将回传数据信息发送给接入网设备2。回传数据信息中可以携带以下一个或者多个：NPN PDU会话的标识(PDU Session ID)、PLMN PDU会话的标识列表、PLMN PDU会话的回传数据信息、数据传输顺序信息、或NPN PDU会话资源建立的原因值。NPN PDU会话的标识和所述PLMN PDU会话的标识列表中的PLMN PDU会话标识用以指示所建立NPN PDU会话资源可以用于回传相应PLMN PDU会话数据。应当理解，NPN PDU会话资源也可以用于或者不用于传输相应NPN PDU会话数据。所述PLMN PDU会话的回传数据信息包括以下一个或多个：PDU会话标识、QoS流标识、DRB标识、或DRB与QoS流的映射列表。可选地，所述PLMN PDU会话的回传数据信息还可以包括需要携带DRB中的数据已发送情况，以保证无损移动，例如，携带上行链路PDCP-SN分组数据汇聚协议服务数据单元序列号(Packet Data Convergence Protocol Sequence Number，PDCP-SN)和HFN接收器状态信息(uplink PDCP-SN and HFN receiver status)以及下行链路PDCP-SN和HFN发送器状态(downlink PDCP SN and HFN transmitter status)信息等等。状态信息可以包括信元UL/DL COUNT Value、Transmit Status of UL PDCP SDUs以及Receive Status of DL PDCP SDUs等等中的一种或者多种。Transmit Status of UL PDCP SDUs用于反映对应的UL PDCP是否已经成功发出，如0表示对应的PDCP未成功发出，1表示对应的PDCP已成功发出。Receive Status of DL PDCP SDUs用于反映对应的DL PDCP是否已经成功接收，如0表示对应的PDCP未成功接收，1表示对应的PDCP已成功接收。所述数据传输顺序信息用以指 示所述NPN PDU会话资源中传输所述回传的PLMN PDU会话的数据和传输新到达的NPN PDU会话的数据的先后顺序。例如，用NPN PDU会话标识和PLMN PDU会话标识的顺序来或者NPN PDU会话标识和PLMN PDU会话标识的顺序列表来指示传输相应数据的顺序，一个PDU会话的数据传输结束后，在数据末尾添加结束标记(end marker)，进而继续传输另一个PDU会话的数据。
所述原因值用以指示终端设备请求建立NPN PDU会话的原因，例如，用SNPN、NPN、PLMN、SNPNtoPLMN、PLMNtoSNPN、NPNtoPLMN、PLMNtoNPN、PNI-NPNtoPLMN、PLMNtoPNI-NPN、SNPNtoSNPN、Non-3GPPtoPLMN、PLMNtoNon-3GPP、Non-3GPPtoNon-3GPP、或者InterNetwork-mobility标识原因值，用以指示终端设备跨网移动需要建立NPN PDU会话资源保持业务连续性。
S513：N3IWF 1经数据网络2、UPF 2的第一PLMN段数据回传通道将回传数据发送接入网设备2。
S514：PLMN网络中的接入网设备2、AMF2、UPF2、SMF2为终端设备建立PLMN PDU会话资源以传输新数据。
S515：接入网设备2可以根据回传数据信息向终端设备传输回传数据和新数据，或者，接入网设备2可以根据回传数据信息向第二UPF传输回传数据和新数据。
在本申请具体的实施例中，接入网设备2根据回传数据信息向终端设备传输回传数据和新数据，以及，接入网设备2根据回传数据信息向PLMN核心网的设备(例如，UPF2)传输回传数据和新数据的方式已经在上文中进行了详细的介绍，具体请参见上文以及相关内容，此处不作具体介绍。
此外，本申请还提出了完全不同于上述的目标网络的数据回传方法的新的目标网络的数据回传方法。参见图14，图14是本申请提出的第三种目标网络的数据回传方法的交互图。结合图1所示的NPN独立组网方式，以源网络为NPN网络，目的网络为PLMN网络为例，本实施例的数据回传方法包括如下步骤：
S601：在终端设备接入到所述源网络的接入网设备1的情况下，终端设备向接入网设备1发送准备移动通知。相应地，接入网设备1接收终端设备发送的准备移动通知。
在本申请具体的实施例中，准备移动通知用于通知所述接入网设备1所述终端设备准备从源网络的接入网设备1移动至目的网络的接入网设备2。所述移动通知携带以下的一个或多个：原因值、移动的类型、移动后的位置信息(即，目标网络位置信息)、移动前的位置信息。原因值为终端设备发送通知消息的原因，例如，跨网移动。移动类型为用户从一种网络的小区移动接入到了另一个网络的小区，例如，从NPN到PLMN。移动后的位置信息为终端设备发生移动后所在的PLMN网络的位置信息，例如，PLMN网络标识(Public Land Mobile Network identifier,PLMN ID)、跟踪区域码(tracking area code，TAC)、NG-RAN cell ID、终端设备标识(UE ID)、NG-RAN node ID、所连接的N3IWF的地址信息(例如，N3IWF IP)。所述移动前的位置信息可携带移动前所连接的N3IWF的地址信息例如，N3IWF IP)等等。
S602：接入网设备1根据所述准备移动通知向所述AMF1发送回传数据信息。相应地，所述AMF1接收接入网设备1根据所述准备移动通知发送的回传数据信息。
在本申请具体的实施例中，回传数据信息携带以下一个或多个：PLMN PDU会话的回传数据信息、原因值。所述PLMN PDU会话的回传数据信息包括以下一个或多个：PDU会话标识、QoS流标识、DRB标识、或DRB与QoS流的映射列表。可选地，所述PLMN PDU会话的回传数据信息还可以包括需要携带DRB中的数据已发送情况，以保证无损移动，例如，携带上行链路PDCP-SN分组数据汇聚协议服务数据单元序列号(Packet Data Convergence Protocol Sequence Number，PDCP-SN)和HFN接收器状态信息(uplink PDCP-SN and HFN receiver status)以及下行链路PDCP-SN和HFN发送器状态(downlink PDCP SN and HFN transmitter status)信息等等。状态信息可以包括信元UL/DL COUNT Value、Transmit Status of UL PDCP SDUs以及Receive Status of DL PDCP SDUs等等中的一种或者多种。Transmit Status of UL PDCP SDUs用于反映对应的UL PDCP是否已经成功发出，如0表示对应的PDCP未成功发出，1表示对应的PDCP已成功发出。Receive Status of DL PDCP SDUs用于反映对应的DL PDCP是否已经成功接收，如0表示对应的PDCP未成功接收，1表示对应的PDCP已成功接收。所述原因值用以指示终端设备发送通知信息的原因，例如，用SNPN、NPN、PLMN、SNPNtoPLMN、PLMNtoSNPN、NPNtoPLMN、PLMNtoNPN、PNI-NPNtoPLMN、PLMNtoPNI-NPN、SNPNtoSNPN、Non-3GPPtoPLMN、PLMNtoNon-3GPP、Non-3GPPtoNon-3GPP、或者InterNetwork-mobility标识原因值，用以指示终端设备因跨网移动而发送移动通知信息。
S603：AMF1向终端设备发送回传数据信息。相应地，终端设备接收AMF1发送的回传数据信息。
S604：终端设备将回传数据信息发送给AMF2。相应地，AMF2接收终端设备发送的回传数据信息。例如，UE通过RAN1>UPF1>DN1>N3IWF2建立与AMF2间的N1接口，UE向AMF2发送NAS信息。
S605：AMF2将所述回传数据信息转发给UPF2。相应地，UPF2接收AMF2发送的所述回传数据信息。
S606：UPF2为所述回传数据配置第二NPN段数据回传通道的传输网络层信息，并发送给AMF2。
在本申请具体的实施例中，传输网络层信息用于为第二NPN段数据回传通道配置参数。所述传输网络层信息可以包括上行转发用户面传输网络层信息(UL Forwarding UP TNL Information)和下行转发用户面传输网络层信息(DL Forwarding UP TNL Information)中的一种或者多种，所述上行转发用户面传输网络层信息可包括上行传输层地址(例如，端口IP地址)和上行GTP隧道端口标识(如，GTP-TEID，GTP-Tunnel Endpoint Identifier等)，所述下行转发用户面传输网络层信息可包括下行传输层地址(例如，端口IP地址)和下行GTP隧道端口标识(如，GTP-TEID，GTP-Tunnel Endpoint Identifier等)
S607：AMF2向N3IWF2发送所述传输网络层信息。相应地，N3IWF2接收AMF2发送的所述传输网络层信息。
N3IWF2基于传输网络层信息可知UPF2侧的地址，从而建立了N3IWF2到UPF2段的数据回传通道。
S608：终端设备向AMF1发送准备移动通知，准备移动通知用于通知所述AMF1所述 终端设备准备从源网络的接入网设备1移动至目的网络的接入网设备2。所述准备移动通知携带以下的一个或多个：原因值、移动的类型、移动后的位置信息(即，目标网络位置信息)，移动前的位置信息。原因值为终端设备发送通知消息的原因，例如，跨网移动。移动类型为用户从一种网络的小区移动接入到了另一个网络的小区，例如，从NPN到PLMN。移动后的位置信息为终端设备发生移动后所在的PLMN网络的位置信息，例如，PLMN网络标识(Public Land Mobile Network identifier,PLMN ID)、跟踪区域码(tracking area code，TAC)、NG-RAN cell ID、终端设备标识(UE ID)、NG-RAN node ID、所连接的N3IWF的地址信息(例如，N3IWF IP)。所述移动前的位置信息可携带移动前所连接的N3IWF的地址信息例如，N3IWF IP)等等。
应当理解，准备移动通知也可由接入网设备1在S602后发送给AMF1，准备移动通知中携带上述信息。
S609：AMF1将上述准备移动通知所携带的信息(例如，移动前所连接的N3IWF的地址信息)和S602中接收到的回传数据信息发送给UPF1。
S610：UPF1基于回传数据信息配置回传通道传输层网络信息。UPF1将传输网络层信息发送给AMF1。
S611：AMF1将传输网络层信息发送给接入网设备1。接入网设备1基于传输网络层信息建立了从接入网设备1到UPF1之间的回传通道，UPF1基于S608中终端设备移动前所连接的N3IWF的地址信息建立了从UPF1到N3IWF2之间的回传通道，N3IWF2基于S607中的UPF2侧的传输网络层信息建立了从N3IWF2间的回传通道。从而，建立了接入网设备1到UPF2之间的第二NPN段数据回传通道。
应当理解，AMF2也可将UPF2的传输网络层信息通过N1接口发送给终端设备，终端设备发送给AMF1，AMF1发送给UPF1，UPF1基于UPF2的传输网络层信息可建立UPF1至UPF2的回传通道信息。从而，建立了接入网设备1到UPF2之间的第二NPN段数据回传通道。
S612：接入网设备1将回传数据通过第二NPN段数据回传通道发送给UPF2。相应地，UPF2通过第二NPN段数据回传通道接收回传数据。
S613：终端设备从所述源网络的接入网设备1移动至所述目的网络的接入网设备2。
S614：终端设备向AMF2发送回传数据信息。相应地，AMF2接收终端设备发送的回传数据信息。
S615：AMF2向UPF2发送通道建立请求。相应地，UPF2接收AMF2的通道建立请求。其中，所述通道建立请求用于为所述终端设备建立PLMN PDU会话资源。
S616：UPF2为PLMN PDU会话资源配置传输网络层信息。
S617：UPF2将所述传输网络层信息发送给AMF2。相应地，AMF2接收UPF2发送的传输网络层信息。
S618：AMF2向接入网设备2发送回传数据信息以及传输网络层信息。相应地，接入网设备2接收AMF2发送的回传数据信息以及传输网络层信息。
应当理解，也可由终端设备发送回传数据信息给接入网设备2。
S619：如图15所示，接入网设备2配置传输网络层信息，以建立第二PLMN段数据 回传通道。其中，第二PLMN段数据回传通道是指从UPF2至接入网设备2之间的数据回传通道。
在本申请具体的实施例中，如图15所示，第二NPN段数据回传通道和第二PLMN段数据回传通道构成了从接入网设备1至接入网设备2之间的数据回传通道。
S620：接入网设备2与终端设备间建立相应DRB。
S621：UPF2通过第二PLMN段数据回传通道将回传数据回传至接入网设备2。终端设备通过DRB将新的上行数据传至接入网设备2，接入网设备2将新到达的PLMN PDU会话上行数据和回传收到的PLMN PDU会话上行数据传输至UPF2，或者，接入网设备2通过DRB将下行回传的PLMN PDU会话数据和下行新到达的PLMN PDU会话数据传输给终端设备。
上文中的第二NPN段数据回传通道和第二PLMN段数据回传通道均是专用回传通道，回传数据的粒度可以是PDU session粒度，也可以是DRB粒度。下面以回传数据的粒度的两种具体的方式的具体情况进行详细的介绍。
在第一种方式中，第二NPN段数据回传通道和第二PLMN段数据回传通道均是专用回传通道，回传数据的粒度可以是PDU session粒度。在下行数据方向上，接入网设备2通过DRB将接收到的待回传的PLMN PDU会话数据和新到达的PLMN PDU会话数据先后发送给终端设备，终端设备将待回传的PLMN PDU会话数据和新到达的PLMN PDU会话数据按照上述顺序先后发送至高层应用，由高层应用解析出待回传的PLMN PDU会话数据和新到达的PLMN PDU会话数据。上行方向的用户面数据和下行方向的用户面数据的传输方式相类似，只是接收端为UPF2，即，接入网设备2将待回传的PLMN PDU会话数据和新到达的PLMN PDU会话数据发送给PLMN-UPF。
在第二种方式中，第二NPN段数据回传通道和第二PLMN段数据回传通道均是专用回传通道，回传数据的粒度可以是DRB粒度。接入网设备2将待回传的PLMN PDU数据和新到达的PLMN PDU会话数据进行PDCP编号、重排序和传输。在传输时，不应传送任何PDCP SN值低于所提供的UL PDCP SN值的上行数据，并且应使用提供的DL PDCP SN值作为要发送的尚未分配PDCP-SN的第一个下行数据包的PDCP SN值，以进行数据的按序传输，避免数据的重复发送。对于下行方向的用户面数据：(应使用提供的DL PDCP SN值作为要发送的尚未分配PDCP-SN的第一个下行数据包的PDCP SN值)：接入网设备2通过DRB将待回传的PLMN PDU会话数据和新到达的PLMN PDU会话数据发送给终端设备，终端设备并将待回传的PLMN PDU会话数据和新到达的PLMN PDU会话数据按照上述PDCP SN编号发送至高层应用，由高层应用解析出待回传的PLMN PDU会话数据和新到达的PLMN PDU会话数据。上行方向的用户面数据和下行方向的用户面数据的传输方式相类似，只需要将接收端从终端设备替换为UPF2，接入网设备2将待回传的PLMN PDU会话数据和新到达的PLMN PDU会话数据发送给UPF2，此外，接入网设备2通过NG口资源而不是DRB资源将待回传的PLMN PDU会话数据和新到达的PLMN PDU会话数据发送给UPF2。
参见图16，图16是本申请提出的一种设备的结构示意图。如图16所示，所述设备包括：接收模块110、发送模块120以及处理模块130。
当接入网设备为第一接入网设备的时候，第一接入网设备位于源网络，第二接入网设备位于目标网络，所述源网络和所述目标网络分别采用不同的网络类型，所述网络类型包括公有网络以及私有网络，终端设备从所述第一接入网设备移动至所述第二接入网设备。
处理模块130指示所述接收模块110用于接收所述目标网络发送的回传数据，其中，所述回传数据为所述第一接入网设备发送的但未被所述终端设备成功接收的所述目标网络的数据，或者，所述第一接入网设备发送的但未被所述目标网络成功接收的所述目标网络的数据；
处理模块130指示所述发送模块120用于通过源网络段数据回传通道将回传数据发送给网络设备，以供所述网络设备通过目标网络段数据回传通道将所述回传数据发送给第二接入网设备。
处理模块130指示所述发送模块120还用于获取回传数据信息，其中，所述回传数据信息携带以下一个或多个：需要进行数据回传的原因，数据回传的类型，需要进行数据回传的PDU会话标识，数据无线承载DRB的标识，或所述DRB所对应的服务质量QoS流的QoS流标识，所述数据回传的原因包括移动，所述数据回传的类型包括从所述源网络回传到所述目标网络；
处理模块130指示所述发送模块120还用于向所述第二接入网设备发送所述回传数据信息。
在一些可能的设计中，所述回传数据信息是所述终端设备移动到所述第二接入网设备之后，通过N1接口发送给第一接入和移动管理功能AMF，所述第一AMF位于所述源网络，并由所述第一AMF发送给所述第一接入网设备的，并且，所述第一回传数据信息和所述第二回传数据信息中的至少一项是所述终端设备移动到所述第二接入网设备之后，发送给所述第二接入网设备的；其中，所述N1接口表示所述第一接入网设备经由所述第二接入网设备、所述第二UPF、所述第一N3IWF连接所述第一AMF的接口。
在一些可能的设计中，所述回传数据信息是在所述终端设备移动到所述第二接入网设备之前，所述第一接入网设备发送给所述终端设备，在所述终端设备移动到所述第二接入网设备之后，所述终端设备发送给所述第二接入网设备的。
在一些可能的设计中，所述源网络段数据回传通道为所述第一接入网设备到所述第一UPF的通道；或者；所述源网络段数据回传通道为所述第一接入网设备到所述第一N3IWF的通道。
在一些可能的设计中，所述源网络段数据回传通道是所述第一接入网设备和所述第一UPF根据传输网络层信息配置生成的，所述传输网络层信息包括上行转发传输网络层信息和下行转发用户面传输网络层信息中的一种或者多种，所述上行转发用户面传输网络层信息包括上行传输层地址和上行通用分组无线服务技术隧道协议GTP隧道端口标识，所述下行转发用户面传输网络层信息包括下行传输层地址和下行GTP隧道端口标识。
在一些可能的设计中，所述传输网络层信息是所述第一UPF生成的，并且，所述传输网络层信息是所述第一UPF通过第一AMF发送给所述第一接入网设备的。
在一些可能的设计中，所述终端设备用于在从所述第一接入网设备移动至所述第二接入网设备之后，向所述第一AMF发送移动通知，其中，所述移动通知用于通知所述第一 AMF所述终端设备从所述第一接入网设备移动至所述第二接入网设备。
在一些可能的设计中，所述移动通知是所述终端设备通过所述N1接口发送给所述第一AMF的。
在一些可能的设计中，所述终端设备用于在向所述第一接入网设备发送准备移动通知之后，从所述第一接入网设备移动至所述第二接入网设备，其中，所述准备移动通知用于通知所述第一接入网设备所述终端设备准备从所述第一接入网设备移动至所述第二接入网设备。
在一些可能的设计中，所述目标网络段数据回传通道为所述第一UPF到所述第二接入网设备的通道；或者；所述目标网络段数据回传通道为所述第一N3IWF到所述第二接入网设备的通道。
在一些可能的设计中，所述目标网络段数据回传通道属于所述终端设备与所述源网络之间建立的PDU会话资源。
在一些可能的设计中，所述目标网络段数据回传通道为专用数据回传通道。
在一些可能的设计中，所述回传数据的粒度为PDU会话粒度。
在一些可能的设计中，在所述回传数据的粒度为DRB粒度。
在一些可能的设计中，所述回传数据包括第一报文头以及第二报文头，其中，所述第一报文头是所述回传数据从所述目标网络向所述第一接入网设备发送并经过第一N3IWF时添加的，所述第二报文头是所述回传数据从所述第一接入网设备向所述第二接入网设备发送并再次经过所述第一N3IWF时添加的。
在一些可能的设计中，所述源网络为NPN网络，所述目标网络为PLMN网络；或者，所述源网络为PLMN网络，所述目标网络为NPN网络。
为了简便起见，此处没有对第一接入网设备进行详细的介绍，具有请参见图1至图15以及相关描述中关于接入网设备1的描述，此处不再展开描述。
当接入网设备为第一接入网设备的时候，第一接入网设备位于源网络，第二接入网设备位于目标网络，所述源网络和所述目标网络分别采用不同的网络类型，所述网络类型包括公有网络以及私有网络，终端设备从所述第一接入网设备移动至所述第二接入网设备。
处理模块130指示接收模块110用于接收来自网络设备通过目标网络段数据回传通道的第一回传数据，其中，所述第一回传数据是所述第一接入网设备通过源网络段数据回传通道发送给所述网络设备，所述第一回传数据为所述第一接入网设备发送的但未被所述终端设备成功接收的所述目标网络的数据，所述网络设备为第一用户面功能UPF或者第一非第三代合作伙伴计划互通功能N3IWF，所述第一UPF位于所述源网络，所述第一N3IWF位于所述源网络；
处理模块130指示接收模块110用于接收来自第二UPF的第一数据，所述第二UPF位于所述目标网络；
处理模块130指示发送模块120用于将所述第一回传数据和所述第一数据发送给所述终端设备；
或者；
处理模块130指示接收模块110用于接收来自网络设备通过目标网络段数据回传通道的第二回传数据，其中，所述第二回传数据是所述第一接入网设备通过源网络段数据回传通道发送给所述网络设备，所述第二回传数据为所述第一接入网设备接收的来自终端设备的乱序的数据或者所述第一接入网设备接收的来自终端设备的需要进行重新排序的数据；例如，第一接入网设备接收到了来自终端设备的上行的乱序的数据，不能上传给核心网，所以要进行数据回传。再例如，第一接入设备接收来自终端设备的上行数据的过程中，DRB和QoS流的映射关系发生了变化，比如原来终端设备的某个QoS流数据在DRB1上传输，而后在DRB2上传输，需要DRB1中的该QoS流的数据完全上传核心网后，才能传输DRB2中的该QoS流的数据，如果终端设备在目标RAN下还需要在DRB1上传该QoS流的数据，就需要将DRB2中的该QoS流数据回传给目标RAN，与目标RAN下的DRB1中的QoS流数据进行重新排序，按序上传给核心网；
处理模块130指示接收模块110用于接收来自所述终端设备的第二数据；
处理模块130指示发送模块120用于将所述第二回传数据和所述第二数据发送给所述第二UPF。
处理模块130指示所述接收模块110还用于接收第一回传数据信息，其中，所述第一回传数据信息携带以下一个或多个：需要进行数据回传的原因，数据回传的类型，需要进行数据回传的协议数据单元PDU会话标识，数据无线承载DRB的标识，或所述DRB所对应的服务质量QoS流的QoS流标识，所述数据回传的原因包括移动，所述数据回传的类型包括从所述源网络回传到所述目标网络；
处理模块130指示所述发送模块120还用于根据所述第一回传数据信息将所述第一回传数据和所述第一数据发送给所述终端设备；
或者；
处理模块130指示所述接收模块110还用于接收第二回传数据信息，所述第二回传数据信息携带以下一个或多个：需要进行数据回传的原因，数据回传的类型，需要进行数据回传的协议数据单元PDU会话标识，数据无线承载DRB的标识，或所述DRB所对应的服务质量QoS流的QoS流标识，所述数据回传的原因包括移动，所述数据回传的类型包括从所述源网络回传到所述目标网络；
处理模块130指示所述发送模块120用于根据所述第二回传数据信息将所述第二回传数据和所述第二数据发送给所述第二UPF。
在一些可能的设计中，所述第一回传数据信息和所述第二回传数据信息中的至少一项是所述终端设备移动到所述第二接入网设备之后，通过N1接口发送给第一接入和移动管理功能AMF，所述第一AMF位于所述源网络，并由所述第一AMF发送给所述第一接入网设备的，并且，所述第一回传数据信息和所述第二回传数据信息中的至少一项是所述终端设备移动到所述第二接入网设备之后，发送给所述第二接入网设备的；其中，
所述N1接口表示所述第一接入网设备经由所述第二接入网设备、所述第二UPF、所述第一N3IWF连接所述第一AMF的接口。
在一些可能的设计中，所述第一回传数据信息和所述第二回传数据信息中的至少一项是在所述终端设备移动到所述第二接入网设备之前，所述第一接入网设备发送给所述终端 设备，在所述终端设备移动到所述第二接入网设备之后，所述终端设备发送给所述第二接入网设备的。
在一些可能的设计中，所述源网络段数据回传通道为所述第一接入网设备到所述第一UPF的通道；或者；所述源网络段数据回传通道为所述第一接入网设备到所述第一N3IWF的通道。
在一些可能的设计中，所述源网络段数据回传通道是所述第一接入网设备和所述第一UPF根据传输网络层信息配置生成的，所述传输网络层信息包括上行转发传输网络层信息和下行转发用户面传输网络层信息中的一种或者多种，所述上行转发用户面传输网络层信息包括上行传输层地址和上行通用分组无线服务技术隧道协议GTP隧道端口标识，所述下行转发用户面传输网络层信息包括下行传输层地址和下行GTP隧道端口标识。
在一些可能的设计中，所述传输网络层信息是所述第一UPF生成的，并且，所述传输网络层信息是所述第一UPF通过第一AMF发送给所述第一接入网设备的。
在一些可能的设计中，所述目标网络段数据回传通道为所述第一UPF到所述第二接入网设备的通道；或者；所述目标网络段数据回传通道为所述第一N3IWF到所述第二接入网设备的通道。
在一些可能的设计中，在所述目标网络段数据回传通道属于所述终端设备与所述源网络之间建立的PDU会话资源的情况下，
处理模块130指示发送模块120用于指示终端设备所述第二接入网设备通过所述终端设备与所述目标网络之间建立的PDU会话资源将所述第一回传数据和所述第一数据发送给所述终端设备；或者，
处理模块130指示发送模块120用于指示终端设备所述第二接入网设备通过所述终端设备与所述源网络之间建立的PDU会话资源将所述第一回传数据和所述第一数据发送给所述终端设备；或者，
处理模块130指示发送模块120用于指示终端设备所述第二接入网设备通过所述终端设备与所述源网络之间建立的PDU会话资源将所述第一回传数据发送给所述终端设备，以及，通过所述终端设备与所述目标网络之间建立的PDU会话资源将所述第一数据发送给所述终端设备。
在一些可能的设计中，在所述目标网络段数据回传通道为专用数据回传通道的情况下，
所述第二接入网设备通过所述终端设备与所述目标网络之间建立的PDU会话资源将所述第一回传数据和所述第一数据发送给所述终端设备。
在一些可能的设计中，在所述回传数据的粒度为PDU会话粒度的情况下，
处理模块130指示发送模块120用于先将所述第一回传数据发送给所述终端设备，然后，再将所述第一数据发送给所述终端设备；或者，
处理模块130指示发送模块120用于先将所述第二回传数据发送给所述第二UPF，然后，再将所述第二数据发送给所述第二UPF。
在一些可能的设计中，在所述回传数据的粒度为DRB粒度的情况下，
处理模块130指示发送模块120用于将所述第一回传数据和所述第一数据进行分组数据汇聚协议PDCP编号，从而得到编号后的所述第一回传数据和所述第一数据；
处理模块130指示发送模块120用于将编号后的所述第一回传数据和所述第一数据发送给所述终端设备；
或者；
处理模块130指示发送模块120用于将所述第二回传数据和所述第二数据进行PDCP编号，从而得到编号后的所述第二回传数据和所述第二数据；
处理模块130指示发送模块120用于将编号后的所述第二回传数据和所述第二数据发送给所述第二UPF。
在一些可能的设计中，所述第一回传数据包括第一报文头以及第二报文头，其中，所述第一报文头是所述第一回传数据从所述目标网络向所述第一接入网设备发送并经过第一N3IWF时添加的，所述第二报文头是所述第一回传数据从所述第一接入网设备向所述第二接入网设备发送并再次经过所述第一N3IWF时添加的。
在一些可能的设计中，所述源网络为NPN网络，所述目标网络为PLMN网络；或者，
所述源网络为PLMN网络，所述目标网络为NPN网络。
为了简便起见，此处没有对第二接入网设备进行详细的介绍，具有请参见图1至图15以及相关描述中关于接入网设备2的描述，此处不再展开描述。
当接入网设备为第一AMF的时候，第一接入网设备位于源网络，第二接入网设备位于目标网络，所述源网络和所述目标网络分别采用不同的网络类型，所述网络类型包括公有网络以及私有网络，终端设备从所述第一接入网设备移动至所述第二接入网设备。
处理模块130指示接收模块110用于接收终端设备发送的移动通知或者准备移动通知，其中，所述第一AMF属于所述第一接入网设备，所述移动通知用于通知所述第一AMF所述终端设备从所述第一接入网设备移动至所述第二接入网设备，所述准备移动通知用于通知所述第一接入网设备所述终端设备准备从所述第一接入网设备移动至所述第二接入网设备；
处理模块130指示发送模块120用于基于所述移动通知或者准备移动通知向第一UPF发送回传通道建立通知，其中，所述回传通道建立通知用于通知第一UPF1建立所述第一接入网设备至网络设备之间的源网络段数据回传通道，其中，所述源网络段数据回传通道用于供所述第一接入网设备将回传数据发送给所述网络设备，以使得所述网络设备将所述回传数据通过目标网络段数据回传通道发送给所述第二接入网设备，所述回传数据为所述第一接入网设备发送的但未被所述终端设备成功接收的所述目标网络的数据，或者，所述第一接入网设备发送的但未被所述目标网络成功接收的所述目标网络的数据。
在一些可能的设计中，所述接收模块110用于接收所述终端设备移动到所述第二接入网设备之后，通过N1接口发送的回传数据信息，其中，所述回传数据信息携带以下一个或多个：需要进行数据回传的原因，数据回传的类型，需要进行数据回传的PDU会话标识，数据无线承载DRB的标识，或所述DRB所对应的服务质量QoS流的QoS流标识，所述数据回传的原因包括移动，所述数据回传的类型包括从所述源网络回传到所述目标网络；
处理模块130指示所述发送模块120用于向第二接入网设备发送所述回传数据信息。
在一些可能的设计中，所述N1接口表示所述第一接入网设备经由所述第二接入网设 备、所述第二UPF、所述第一N3IWF连接所述第一AMF的接口。
在一些可能的设计中，所述源网络段数据回传通道为所述第一接入网设备到所述第一UPF的通道；或者；所述源网络段数据回传通道为所述第一接入网设备到所述第一N3IWF的通道。
在一些可能的设计中，所述源网络段数据回传通道是所述第一接入网设备和所述第一UPF根据传输网络层信息配置生成的，所述传输网络层信息包括上行转发传输网络层信息和下行转发用户面传输网络层信息中的一种或者多种，所述上行转发用户面传输网络层信息包括上行传输层地址和上行通用分组无线服务技术隧道协议GTP隧道端口标识，所述下行转发用户面传输网络层信息包括下行传输层地址和下行GTP隧道端口标识。
在一些可能的设计中，处理模块130指示所述接收模块110接收所述第一UPF发送的所述传输网络层信息，其中，所述传输网络层信息是所述第一UPF生成的；所述发送模块120用于将所述传输网络层信息发送给所述第一接入网设备。
在一些可能的设计中，处理模块130指示所述接收模块110用于接收所述终端设备通过N1接口发送的所述移动通知。
在一些可能的设计中，所述目标网络段数据回传通道为所述第一UPF到所述第二接入网设备的通道；或者；所述目标网络段数据回传通道为所述第一N3IWF到所述第二接入网设备的通道。
在一些可能的设计中，所述目标网络段数据回传通道属于所述终端设备与所述源网络之间建立的PDU会话资源。
在一些可能的设计中，所述目标网络段数据回传通道为专用数据回传通道。
在一些可能的设计中，所述回传数据的粒度为PDU会话粒度。
在一些可能的设计中，在所述回传数据的粒度为DRB粒度。
在一些可能的设计中，所述回传数据包括第一报文头以及第二报文头，其中，所述第一报文头是所述回传数据从所述目标网络向所述第一接入网设备发送并经过第一N3IWF时添加的，所述第二报文头是所述回传数据从所述第一接入网设备向所述第二接入网设备发送并再次经过所述第一N3IWF时添加的。
在一些可能的设计中，所述源网络为NPN网络，所述目标网络为PLMN网络；或者，所述源网络为PLMN网络，所述目标网络为NPN网络。
为了简便起见，此处没有对第一AMF进行详细的介绍，具有请参见图1至图15以及相关描述中关于AMF1的描述，此处不再展开描述。
参见图17，图17本申请实施例提供的一种网络设备的结构示意图。本实施方式的网络设备可以包括：发送器210、接收器220、存储器230以及处理器240。其中，处理器通过总线250分别耦合发送器210、接收器220以及存储器230。其中，
发送器210和接收器220可以分开设置，也可以集成设置。其中，发送器210可以用于发送数据，所述接收器220可以用于接收数据。
存储器230可以包括易失性存储器(Volatile Memory)，例如随机存取存储器(Random Access Memory，RAM)；存储器也可以包括非易失性存储器(Non-Volatile Memory)，例如只读存储器(Read-Only Memory，ROM)、快闪存储器(Flash Memory)、硬盘(Hard  Disk Drive，HDD)或固态硬盘(Solid-State Drive，SSD)存储器还可以包括上述种类的存储器的组合。外部存储器230可以存储有程序代码以及程序数据。
处理器240包括一个或者多个通用处理器，其中，通用处理器可以是能够处理电子指令的任何类型的设备，包括中央处理器(Central Processing Unit，CPU)、微处理器、微控制器、主处理器、控制器以及ASIC(Application Specific Integrated Circuit，专用集成电路)等等。处理器240执行各种类型的数字存储指令，例如存储在存储器230中的软件或者固件程序，它能使识别设备提供较宽的多种服务。例如，处理器240能够执行程序或者处理数据，以执行本文讨论的方法的至少一部分。
当所述网络设备为第一接入网设备时，处理器240用于指示接收器220接收所述目标网络发送的回传数据，其中，所述回传数据为所述第一接入网设备发送的但未被所述终端设备成功接收的所述目标网络的数据，或者，所述第一接入网设备发送的但未被所述目标网络成功接收的所述目标网络的数据；
处理器240用于指示发送器210通过源网络段数据回传通道将回传数据发送给网络设备，以供所述网络设备通过目标网络段数据回传通道将所述回传数据发送给第二接入网设备。
为了简便起见，此处没有对第一接入网设备进行详细的介绍，具有请参见图1至图15以及相关描述中关于接入网设备2的描述，此处不再展开描述。
当所述网络设备为所述第二接入网设备时，处理器240用于指示接收器220接收来自网络设备通过目标网络段数据回传通道的第一回传数据，其中，所述第一回传数据是所述第一接入网设备通过源网络段数据回传通道发送给所述网络设备，所述第一回传数据为所述第一接入网设备发送的但未被所述终端设备成功接收的所述目标网络的数据，所述网络设备为第一用户面功能UPF或者第一非第三代合作伙伴计划互通功能N3IWF，所述第一UPF位于所述源网络，所述第一N3IWF位于所述源网络；
处理器240用于指示接收器220接收来自第二UPF的第一数据，所述第二UPF位于所述目标网络；
处理器240用于指示发送器210将所述第一回传数据和所述第一数据发送给所述终端设备；
或者；
处理器240用于指示接收器220接收来自网络设备通过目标网络段数据回传通道的第二回传数据，其中，所述第二回传数据是所述第一接入网设备通过源网络段数据回传通道发送给所述网络设备，所述第二回传数据为所述第一接入网设备接收的来自终端设备的乱序的数据或者所述第一接入网设备接收的来自终端设备的需要进行重新排序的数据；
处理器240用于指示接收器220接收来自所述终端设备的第二数据；
处理器240用于指示发送器210将所述第二回传数据和所述第二数据发送给所述第二UPF。
为了简便起见，此处没有对第二接入网设备进行详细的介绍，具有请参见图1至图15以及相关描述中关于接入网设备2的描述，此处不再展开描述。
当网络设备为第一AMF时，处理器240用于指示接收器220接收终端设备发送的移动通知或者准备移动通知，其中，所述第一AMF属于所述第一接入网设备，所述移动通知用于通知所述第一AMF所述终端设备从所述第一接入网设备移动至所述第二接入网设备，所述准备移动通知用于通知所述第一接入网设备所述终端设备准备从所述第一接入网设备移动至所述第二接入网设备；
处理器240用于指示发送器210基于所述移动通知或者准备移动通知向第一UPF发送回传通道建立通知，其中，所述回传通道建立通知用于通知第一UPF1建立所述第一接入网设备至网络设备之间的源网络段数据回传通道，其中，所述源网络段数据回传通道用于供所述第一接入网设备将回传数据发送给所述网络设备，以使得所述网络设备将所述回传数据通过目标网络段数据回传通道发送给所述第二接入网设备，所述回传数据为所述第一接入网设备发送的但未被所述终端设备成功接收的所述目标网络的数据，或者，所述第一接入网设备发送的但未被所述目标网络成功接收的所述目标网络的数据。
为了简便起见，此处没有对第一AMF进行详细的介绍，具有请参见图1至图15以及相关描述中关于接入网设备2的描述，此处不再展开描述。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线)或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，(例如，软盘、存储盘、磁带)、光介质(例如，DVD)、或者半导体介质(例如固态存储盘Solid State Disk(SSD))等。

Claims (30)

  1. 一种数据回传方法，其特征在于，第一接入网设备位于源网络，第二接入网设备位于目标网络，所述源网络和所述目标网络分别采用不同的网络类型，所述网络类型包括公有网络以及私有网络，终端设备从所述第一接入网设备移动至所述第二接入网设备，所述方法包括：
    所述第二接入网设备接收来自网络设备通过目标网络段数据回传通道的第一回传数据，其中，所述第一回传数据是所述第一接入网设备通过源网络段数据回传通道发送给所述网络设备，所述第一回传数据为所述第一接入网设备发送的但未被所述终端设备成功接收的所述目标网络的数据，所述网络设备为第一用户面功能UPF或者第一非第三代合作伙伴计划互通功能N3IWF，所述第一UPF位于所述源网络，所述第一N3IWF位于所述源网络；
    所述第二接入网设备接收来自第二UPF的第一数据，所述第二UPF位于所述目标网络；
    所述第二接入网设备将所述第一回传数据和所述第一数据发送给所述终端设备；
    或者；
    所述第二接入网设备接收来自网络设备通过目标网络段数据回传通道的第二回传数据，其中，所述第二回传数据是所述第一接入网设备通过源网络段数据回传通道发送给所述网络设备，所述第二回传数据为所述第一接入网设备接收的来自终端设备的乱序的数据或者所述第一接入网设备接收的来自终端设备的需要进行重新排序的数据；
    所述第二接入网设备接收来自所述终端设备的第二数据；
    所述第二接入网设备将所述第二回传数据和所述第二数据发送给所述第二UPF。
  2. 根据权利要求1所述的方法，其特征在于，
    所述第二接入网设备将所述第一回传数据和所述第一数据发送给所述终端设备，包括：
    所述第二接入网设备接收第一回传数据信息，其中，所述第一回传数据信息携带以下一个或多个：需要进行数据回传的原因，数据回传的类型，需要进行数据回传的协议数据单元PDU会话标识，数据无线承载DRB的标识，或所述DRB所对应的服务质量QoS流的QoS流标识，所述数据回传的原因包括移动，所述数据回传的类型包括从所述源网络回传到所述目标网络；
    所述第二接入网设备根据所述第一回传数据信息将所述第一回传数据和所述第一数据发送给所述终端设备；
    或者；
    所述第二接入网设备将所述第二回传数据和所述第二数据发送给所述第二UPF，包括：
    所述第二接入网设备接收第二回传数据信息，所述第二回传数据信息携带以下一个或多个：需要进行数据回传的原因，数据回传的类型，需要进行数据回传的协议数据单元PDU会话标识，数据无线承载DRB的标识，或所述DRB所对应的服务质量QoS流的QoS流标识，所述数据回传的原因包括移动，所述数据回传的类型包括从所述源网络回传到所述目标网络；
    所述第二接入网设备根据所述第二回传数据信息将所述第二回传数据和所述第二数据 发送给所述第二UPF。
  3. 根据权利要求2所述的方法，其特征在于，
    所述第一回传数据信息和所述第二回传数据信息中的至少一项是所述终端设备移动到所述第二接入网设备之后，通过N1接口发送给第一接入和移动管理功能AMF，所述第一AMF位于所述源网络，并由所述第一AMF发送给所述第一接入网设备的，并且，所述第一回传数据信息和所述第二回传数据信息中的至少一项是所述终端设备移动到所述第二接入网设备之后，发送给所述第二接入网设备的；其中，
    所述N1接口表示所述第一接入网设备经由所述第二接入网设备、所述第二UPF、所述第一N3IWF连接所述第一AMF的接口。
  4. 根据权利要求2所述的方法，其特征在于，
    所述第一回传数据信息和所述第二回传数据信息中的至少一项是在所述终端设备移动到所述第二接入网设备之前，所述第一接入网设备发送给所述终端设备，在所述终端设备移动到所述第二接入网设备之后，所述终端设备发送给所述第二接入网设备的。
  5. 根据权利要求1至4任一权利要求所述的方法，其特征在于，
    所述源网络段数据回传通道为所述第一接入网设备到所述第一UPF的通道；或者；
    所述源网络段数据回传通道为所述第一接入网设备到所述第一N3IWF的通道。
  6. 根据权利要求5所述的方法，其特征在于，
    所述源网络段数据回传通道是所述第一接入网设备和所述第一UPF根据传输网络层信息配置生成的，所述传输网络层信息包括上行转发传输网络层信息和下行转发用户面传输网络层信息中的一种或者多种，所述上行转发用户面传输网络层信息包括上行传输层地址和上行通用分组无线服务技术隧道协议GTP隧道端口标识，所述下行转发用户面传输网络层信息包括下行传输层地址和下行GTP隧道端口标识。
  7. 根据权利要求6所述的方法，其特征在于，所述传输网络层信息是所述第一UPF生成的，并且，所述传输网络层信息是所述第一UPF通过第一AMF发送给所述第一接入网设备的。
  8. 根据权利要求1至7任一权利要求所述的方法，其特征在于，
    所述目标网络段数据回传通道为所述第一UPF到所述第二接入网设备的通道；或者；
    所述目标网络段数据回传通道为所述第一N3IWF到所述第二接入网设备的通道。
  9. 根据权利要求8所述的方法，其特征在于，在所述目标网络段数据回传通道属于所述终端设备与所述源网络之间建立的PDU会话资源的情况下，
    所述第二接入网设备指示终端设备所述第二接入网设备通过所述终端设备与所述目标 网络之间建立的PDU会话资源将所述第一回传数据和所述第一数据发送给所述终端设备；或者，
    所述第二接入网设备指示终端设备所述第二接入网设备通过所述终端设备与所述源网络之间建立的PDU会话资源将所述第一回传数据和所述第一数据发送给所述终端设备；或者，
    所述第二接入网设备指示终端设备所述第二接入网设备通过所述终端设备与所述源网络之间建立的PDU会话资源将所述第一回传数据发送给所述终端设备，以及，通过所述终端设备与所述目标网络之间建立的PDU会话资源将所述第一数据发送给所述终端设备。
  10. 根据权利要求8所述的方法，其特征在于，在所述目标网络段数据回传通道为专用数据回传通道的情况下，
    所述第二接入网设备通过所述终端设备与所述目标网络之间建立的PDU会话资源将所述第一回传数据和所述第一数据发送给所述终端设备。
  11. 根据权利要求1至10任一权利要求所述的方法，其特征在于，在所述回传数据的粒度为PDU会话粒度的情况下，
    所述第二接入网设备先将所述第一回传数据发送给所述终端设备，然后，再将所述第一数据发送给所述终端设备；或者，
    所述第二接入网设备先将所述第二回传数据发送给所述第二UPF，然后，再将所述第二数据发送给所述第二UPF。
  12. 根据权利要求1至10任一权利要求所述的方法，其特征在于，在所述回传数据的粒度为DRB粒度的情况下，
    所述第二接入网设备将所述第一回传数据和所述第一数据进行分组数据汇聚协议PDCP编号，从而得到编号后的所述第一回传数据和所述第一数据；
    所述第二接入网设备将编号后的所述第一回传数据和所述第一数据发送给所述终端设备；
    或者；
    所述第二接入网设备将所述第二回传数据和所述第二数据进行PDCP编号，从而得到编号后的所述第二回传数据和所述第二数据；
    所述第二接入网设备将编号后的所述第二回传数据和所述第二数据发送给所述第二UPF。
  13. 根据权利要求1至12任一权利要求所述的方法，其特征在于，所述第一回传数据包括第一报文头以及第二报文头，其中，所述第一报文头是所述第一回传数据从所述目标网络向所述第一接入网设备发送并经过第一N3IWF时添加的，所述第二报文头是所述第一回传数据从所述第一接入网设备向所述第二接入网设备发送并再次经过所述第一N3IWF时添加的。
  14. 根据权利要求1至13任一权利要求所述的方法，其特征在于，
    所述源网络为NPN网络，所述目标网络为PLMN网络；或者，
    所述源网络为PLMN网络，所述目标网络为NPN网络。
  15. 一种第二接入网设备，其特征在于，第一接入网设备位于源网络，第二接入网设备位于目标网络，所述源网络和所述目标网络分别采用不同的网络类型，所述网络类型包括公有网络以及私有网络，终端设备从所述第一接入网设备移动至所述第二接入网设备，所述装置包括处理模块、接收模块以及发送模块，
    所述处理模块指示所述接收模块用于接收来自网络设备通过目标网络段数据回传通道的第一回传数据，其中，所述第一回传数据是所述第一接入网设备通过源网络段数据回传通道发送给所述网络设备，所述第一回传数据为所述第一接入网设备发送的但未被所述终端设备成功接收的所述目标网络的数据，所述网络设备为第一用户面功能UPF或者第一非第三代合作伙伴计划互通功能N3IWF，所述第一UPF位于所述源网络，所述第一N3IWF位于所述源网络；
    所述处理模块指示所述接收模块用于接收来自第二UPF的第一数据，所述第二UPF位于所述目标网络；
    所述处理模块指示所述发送模块用于将所述第一回传数据和所述第一数据发送给所述终端设备；
    或者；
    所述处理模块指示所述接收模块用于接收来自网络设备通过目标网络段数据回传通道的第二回传数据，其中，所述第二回传数据是所述第一接入网设备通过源网络段数据回传通道发送给所述网络设备，所述第二回传数据为所述第一接入网设备接收的来自终端设备的乱序的数据或者所述第一接入网设备接收的来自终端设备的需要进行重新排序的数据；
    所述处理模块指示所述接收模块用于接收来自所述终端设备的第二数据；
    所述处理模块指示所述发送模块用于将所述第二回传数据和所述第二数据发送给所述第二UPF。
  16. 根据权利要求1所述的设备，其特征在于，
    所述处理模块指示所述接收模块还用于接收第一回传数据信息，其中，所述第一回传数据信息携带以下一个或多个：需要进行数据回传的原因，数据回传的类型，需要进行数据回传的协议数据单元PDU会话标识，数据无线承载DRB的标识，或所述DRB所对应的服务质量QoS流的QoS流标识，所述数据回传的原因包括移动，所述数据回传的类型包括从所述源网络回传到所述目标网络；
    所述处理模块指示所述发送模块还用于根据所述第一回传数据信息将所述第一回传数据和所述第一数据发送给所述终端设备；
    或者；
    所述处理模块指示所述接收模块还用于接收第二回传数据信息，所述第二回传数据信 息携带以下一个或多个：需要进行数据回传的原因，数据回传的类型，需要进行数据回传的协议数据单元PDU会话标识，数据无线承载DRB的标识，或所述DRB所对应的服务质量QoS流的QoS流标识，所述数据回传的原因包括移动，所述数据回传的类型包括从所述源网络回传到所述目标网络；
    所述处理模块指示所述发送模块用于根据所述第二回传数据信息将所述第二回传数据和所述第二数据发送给所述第二UPF。
  17. 根据权利要求16所述的设备，其特征在于，
    所述第一回传数据信息和所述第二回传数据信息中的至少一项是所述终端设备移动到所述第二接入网设备之后，通过N1接口发送给第一接入和移动管理功能AMF，所述第一AMF位于所述源网络，并由所述第一AMF发送给所述第一接入网设备的，并且，所述第一回传数据信息和所述第二回传数据信息中的至少一项是所述终端设备移动到所述第二接入网设备之后，发送给所述第二接入网设备的；其中，
    所述N1接口表示所述第一接入网设备经由所述第二接入网设备、所述第二UPF、所述第一N3IWF连接所述第一AMF的接口。
  18. 根据权利要求16所述的设备，其特征在于，
    所述第一回传数据信息和所述第二回传数据信息中的至少一项是在所述终端设备移动到所述第二接入网设备之前，所述第一接入网设备发送给所述终端设备，在所述终端设备移动到所述第二接入网设备之后，所述终端设备发送给所述第二接入网设备的。
  19. 根据权利要求15至18任一权利要求所述的设备，其特征在于，
    所述源网络段数据回传通道为所述第一接入网设备到所述第一UPF的通道；或者；
    所述源网络段数据回传通道为所述第一接入网设备到所述第一N3IWF的通道。
  20. 根据权利要求19所述的设备，其特征在于，
    所述源网络段数据回传通道是所述第一接入网设备和所述第一UPF根据传输网络层信息配置生成的，所述传输网络层信息包括上行转发传输网络层信息和下行转发用户面传输网络层信息中的一种或者多种，所述上行转发用户面传输网络层信息包括上行传输层地址和上行通用分组无线服务技术隧道协议GTP隧道端口标识，所述下行转发用户面传输网络层信息包括下行传输层地址和下行GTP隧道端口标识。
  21. 根据权利要求20所述的设备，其特征在于，所述传输网络层信息是所述第一UPF生成的，并且，所述传输网络层信息是所述第一UPF通过第一AMF发送给所述第一接入网设备的。
  22. 根据权利要求15至21任一权利要求所述的设备，其特征在于，
    所述目标网络段数据回传通道为所述第一UPF到所述第二接入网设备的通道；或者；
    所述目标网络段数据回传通道为所述第一N3IWF到所述第二接入网设备的通道。
  23. 根据权利要求22所述的设备，其特征在于，在所述目标网络段数据回传通道属于所述终端设备与所述源网络之间建立的PDU会话资源的情况下，
    所述处理模块指示所述发送模块还用于指示终端设备所述第二接入网设备通过所述终端设备与所述目标网络之间建立的PDU会话资源将所述第一回传数据和所述第一数据发送给所述终端设备；或者，
    所述处理模块指示所述发送模块还用于指示终端设备所述第二接入网设备通过所述终端设备与所述源网络之间建立的PDU会话资源将所述第一回传数据和所述第一数据发送给所述终端设备；或者，
    所述处理模块指示所述发送模块还用于指示终端设备所述第二接入网设备通过所述终端设备与所述源网络之间建立的PDU会话资源将所述第一回传数据发送给所述终端设备，以及，通过所述终端设备与所述目标网络之间建立的PDU会话资源将所述第一数据发送给所述终端设备。
  24. 根据权利要求22所述的设备，其特征在于，在所述目标网络段数据回传通道为专用数据回传通道的情况下，
    所述处理模块指示所述发送模块还用于通过所述终端设备与所述目标网络之间建立的PDU会话资源将所述第一回传数据和所述第一数据发送给所述终端设备。
  25. 根据权利要求15至24任一权利要求所述的设备，其特征在于，在所述回传数据的粒度为PDU会话粒度的情况下，
    所述处理模块指示所述发送模块还用于设备先将所述第一回传数据发送给所述终端设备，然后，再将所述第一数据发送给所述终端设备；或者，
    所述处理模块指示所述发送模块还用于先将所述第二回传数据发送给所述第二UPF，然后，再将所述第二数据发送给所述第二UPF。
  26. 根据权利要求15至25任一权利要求所述的设备，其特征在于，在所述回传数据的粒度为DRB粒度的情况下，
    所述处理模块指示所述发送模块还用于将所述第一回传数据和所述第一数据进行分组数据汇聚协议PDCP编号，从而得到编号后的所述第一回传数据和所述第一数据；
    所述处理模块指示所述发送模块将编号后的所述第一回传数据和所述第一数据发送给所述终端设备；
    或者；
    所述处理模块指示所述发送模块还用于将所述第二回传数据和所述第二数据进行PDCP编号，从而得到编号后的所述第二回传数据和所述第二数据；
    所述处理模块指示所述发送模块还用于将编号后的所述第二回传数据和所述第二数据发送给所述第二UPF。
  27. 根据权利要求15至26任一权利要求所述的设备，其特征在于，所述第一回传数据包括第一报文头以及第二报文头，其中，所述第一报文头是所述第一回传数据从所述目标网络向所述第一接入网设备发送并经过第一N3IWF时添加的，所述第二报文头是所述第一回传数据从所述第一接入网设备向所述第二接入网设备发送并再次经过所述第一N3IWF时添加的。
  28. 根据权利要求15至27任一权利要求所述的设备，其特征在于，
    所述源网络为NPN网络，所述目标网络为PLMN网络；或者，
    所述源网络为PLMN网络，所述目标网络为NPN网络。
  29. 一种第二接入网设备，其特征在于，包括处理器和存储器，所述处理器执行所述存储器中的代码执行如权利要求1至14任一权利要求所述的方法。
  30. 一种可读存储介质，其特征在于，包括指令，当所述指令在第二接入网设备上运行时，使得所述第二接入网设备执行如权利要求1至14任一权利要求所述的方法。
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