WO2019183971A1 - 切换方法和接入网设备 - Google Patents

切换方法和接入网设备 Download PDF

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Publication number
WO2019183971A1
WO2019183971A1 PCT/CN2018/081467 CN2018081467W WO2019183971A1 WO 2019183971 A1 WO2019183971 A1 WO 2019183971A1 CN 2018081467 W CN2018081467 W CN 2018081467W WO 2019183971 A1 WO2019183971 A1 WO 2019183971A1
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WIPO (PCT)
Prior art keywords
network device
access network
data channel
core network
plane core
Prior art date
Application number
PCT/CN2018/081467
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English (en)
French (fr)
Inventor
刘建华
杨宁
Original Assignee
Oppo广东移动通信有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Oppo广东移动通信有限公司 filed Critical Oppo广东移动通信有限公司
Priority to AU2018416730A priority Critical patent/AU2018416730A1/en
Priority to US17/043,626 priority patent/US11297545B2/en
Priority to KR1020207030490A priority patent/KR20200138293A/ko
Priority to PCT/CN2018/081467 priority patent/WO2019183971A1/zh
Priority to EP18911753.4A priority patent/EP3780727B1/en
Priority to CN201880079960.8A priority patent/CN111543081A/zh
Publication of WO2019183971A1 publication Critical patent/WO2019183971A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0066—Transmission or use of information for re-establishing the radio link of control information between different types of networks in order to establish a new radio link in the target network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/38—Reselection control by fixed network equipment
    • H04W36/385—Reselection control by fixed network equipment of the core network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/12—Setup of transport tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/26—Network addressing or numbering for mobility support
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H04W36/144—Reselecting a network or an air interface over a different radio air interface technology

Definitions

  • the embodiments of the present application relate to the field of communications, and more specifically, to a handover method and an access network device.
  • NR New Radio
  • LTE Long Term Evolution
  • EPC Evolved Packet Core
  • 5G core network For the scenario across the core network, in the current handover process, there may be cases where data is to be transmitted during the handover process. If the handover is not timely, the transmission of the partial data is not guaranteed.
  • the embodiment of the present application provides a handover method and an access network device, in which data can be forwarded through a data channel established by a target access network device, thereby improving data transmission reliability as much as possible.
  • a handover method comprising: when a terminal device switches from a first control plane core network device to a second control plane core network device, the first access network device to the second access network device Transmitting a channel establishment request message; the first access network device receives information of a data channel established by the second access network device according to the channel establishment request message; and the first access network device sends the data channel to the terminal device Information, the information of the data channel is used for data transmission between the terminal device and the user plane core network device.
  • the data channel is a channel between the first access network device and the second access network device, and the channel setup request message carries an identifier of the first access network device, where The information of the data channel includes the identity of the data channel and/or configuration parameters of the data channel.
  • the data channel identifier is an identifier of the second access network device.
  • the method further includes: receiving, by the first access network device, uplink data sent by the terminal device from the second access network device by using the data channel; the first access network device The uplink data is forwarded to the user plane core network device.
  • the method further includes: receiving, by the first access network device, downlink data sent by the user plane core network device; the first access network device accessing the second access by using the data channel The network device forwards the downlink data.
  • the data channel is a channel between the second access network device and the user plane core network device, and the channel setup request message carries an identifier of the user plane core network device, where the data channel
  • the information includes the identity of the data channel and/or configuration parameters of the data channel.
  • the identifier of the user plane core network device and/or the identifier of the data channel is used to send uplink data of the terminal device to the user plane core network device.
  • the terminal device before the terminal device completes the handover, the terminal device accesses the first control plane core network device by using the first access network device; after the terminal device completes the handover, the terminal device The second access plane core network device is accessed by the second access network device.
  • the first control plane core network device and the second control plane core network device are core network devices in different communication systems or different core network devices in the same communication system.
  • a handover method comprising: when a terminal device switches from a first control plane core network device to a second control plane core network device, the second access network device receives the first access network device a channel establishment request message sent; the second access network device establishes a data channel according to the channel establishment request message, where the data channel is used for data transmission between the terminal device and the user plane core network device; the second access network The device sends the information of the data channel to the first access network device.
  • the data channel is a channel between the first access network device and the second access network device, and the channel setup request message carries an identifier of the first access network device, where The information of the data channel includes the identity of the data channel and/or configuration parameters of the data channel.
  • the data channel identifier is an identifier of the second access network device.
  • the method further includes: the second access network device receives uplink data sent by the terminal device; and the second access network device forwards the data to the first access network device by using the data channel The upstream data.
  • the method further includes: receiving, by the second access network device, the downlink data sent by the user plane core network device from the first access network device by using the data channel; The network access device sends and forwards the downlink data to the terminal device.
  • the method further includes: after the second access network device receives the handover complete message sent by the terminal device, the second access network device releases the data channel, and/or Sending a path switch message to the second control plane core network device.
  • the data channel is a channel between the second access network device and the user plane core network device, and the channel setup request message carries an identifier of the user plane core network device, where the data channel
  • the information includes the identity of the data channel and/or configuration parameters of the data channel.
  • the identifier of the user plane core network device and/or the identifier of the data channel is used to send uplink data of the terminal device to the user plane core network device.
  • the method further includes: the second access network device sends a path switch message to the second control plane core network device, where the path switch message carries an identifier of the data channel, where the data channel The identifier is used by the user plane core network device to send downlink data to the terminal device through the data channel.
  • the terminal device before the terminal device completes the handover, the terminal device accesses the first control plane core network device by using the first access network device; after the terminal device completes the handover, the terminal device The second access plane core network device is accessed by the second access network device.
  • the first control plane core network device and the second control plane core network device are core network devices in different communication systems or different core network devices in the same communication system.
  • an access network device for performing the method of any of the first aspect or the first aspect of the first aspect.
  • the access network device comprises means for performing the method of any of the above-described first aspect or any of the possible implementations of the first aspect.
  • an access network device for performing the method in any of the foregoing possible implementations of the second aspect or the second aspect.
  • the access network device comprises means for performing the method of any of the above-described second or second aspects of the second aspect.
  • an access network device comprising: a memory, a processor, an input interface, and an output interface.
  • the memory, the processor, the input interface, and the output interface are connected by a bus system.
  • the memory is for storing instructions for executing the memory stored instructions for performing the method of any of the first aspect or the first aspect of the first aspect.
  • an access network device comprising: a memory, a processor, an input interface, and an output interface.
  • the memory, the processor, the input interface, and the output interface are connected by a bus system.
  • the memory is for storing instructions for executing the memory stored instructions for performing the method of any of the above-described second aspect or any of the possible implementations of the second aspect.
  • a computer storage medium for storing the method in any of the above possible implementations of the first aspect or the first aspect, or any possible implementation of the second or second aspect
  • Computer software instructions for use in the method of the present invention which comprise a program designed to perform the above aspects.
  • a computer program product comprising instructions, when executed on a computer, causes the computer to perform the method of any of the first aspect or the optional implementation of the first aspect, or the second Aspect or method of any alternative implementation of the second aspect.
  • FIG. 1 is a schematic diagram of an application scenario of an embodiment of the present application.
  • FIG. 2 is a schematic block diagram of a handover method of an embodiment of the present application.
  • FIG. 3 shows another schematic block diagram of a handover method of an embodiment of the present application.
  • FIG. 4 shows still another schematic block diagram of a handover method of an embodiment of the present application.
  • FIG. 5 shows still another schematic block diagram of a handover method in the embodiment of the present application.
  • FIG. 6 is a schematic block diagram of an access network device according to an embodiment of the present application.
  • FIG. 7 shows another schematic block diagram of an access network device according to an embodiment of the present application.
  • FIG. 8 shows still another schematic block diagram of an access network device according to an embodiment of the present application.
  • FIG. 9 is still another schematic block diagram of an access network device according to an embodiment of the present application.
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolved
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • UMTS Universal Mobile Telecommunication System
  • WiMAX Worldwide Interoperability for Microwave Access
  • the technical solutions of the embodiments of the present application can be applied to various communication systems based on non-orthogonal multiple access technologies, such as a sparse code multiple access (SCMA) system, and a low-density signature (Low). Density Signature (LDS) system, etc., of course, the SCMA system and the LDS system may also be referred to as other names in the communication field; further, the technical solution of the embodiment of the present application can be applied to multi-carrier using non-orthogonal multiple access technology.
  • SCMA sparse code multiple access
  • LDS Density Signature
  • Orthogonal Frequency Division Multiplexing OFDM
  • Filter Bank Multi-Carrier FBMC
  • General Frequency Division Multiplexing Generalized Frequency Division Multiplexing (OFDM)) Frequency Division Multiplexing (GFDM)
  • Filtered Orthogonal Frequency Division Multiplexing Filtered-OFDM, F-OFDM
  • the terminal device in the embodiment of the present application may refer to a user equipment (User Equipment, UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, and a wireless device.
  • Communication device user agent or user device.
  • the access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), with wireless communication.
  • SIP Session Initiation Protocol
  • WLL Wireless Local Loop
  • PDA Personal Digital Assistant
  • the access network device in the embodiment of the present application may be a device for communicating with a terminal device, where the access network device may be a Base Transceiver Station (BTS) in GSM or CDMA, or may be a base station in a WCDMA system.
  • BTS Base Transceiver Station
  • NodeB, NB may also be an evolved base station (Evolutional NodeB, eNB or eNodeB) in the LTE system, or may be a wireless controller in a Cloud Radio Access Network (CRAN) scenario
  • the access network device may be a relay station, an access point, an in-vehicle device, a wearable device, and an access network device in a future 5G network, and the like.
  • the core network device in the embodiment of the present application may be a core network device in the foregoing various communication systems.
  • it may be an Evolved Packet Core of the LTE system, and may also be a Next Generation Core (NGC) in the NR.
  • NNC Next Generation Core
  • This embodiment of the present application is not limited.
  • the UE can access the core network EPC in the LTE through the base station in the LTE, or access the core network NGC in the NR through the base station in the NR.
  • the cross-core network in the embodiment of the present application may be a cross-system, for example, switching from the core network NGC in the NR to the core network EPC in the LTE.
  • the cross-core network in the embodiment of the present application may also refer to the same communication system.
  • Different core network devices For example, the two core network devices before and after the handover may be core network devices in LTE, or may be core network devices in the NR.
  • the source access network may determine the timing of triggering the handover according to the measurement threshold. In other words, the source access network device determines whether the handover is between the core networks, and if Then, the source core network device needs to send a handover request to the source core network device, and the source core network device can notify the target core network device to prepare the resource, and then trigger the terminal device to perform the handover.
  • the source core network device In the current cross-core network switching process, there are too many switching steps. If the terminal device moves too fast, there is data to be transmitted during this period, which may cause data transmission failure.
  • FIG. 2 shows a schematic block diagram of a handover method 100 of an embodiment of the present application. As shown in FIG. 2, the method 100 can be applied to the application scenario in FIG. 1, and the method 100 includes some or all of the following contents:
  • the first access network device receives information about a data channel established by the second access network device according to the channel establishment request message.
  • the first access network device sends information about the data channel to the terminal device, where the information of the data channel is used for data transmission between the terminal device and the user plane core network device.
  • the first access network device in the embodiment of the present application may be referred to as a source access network device, and the second access network device may be referred to as a target access network device.
  • the first control plane core network device may be referred to as a source control plane core network device
  • the second control plane core network device may be referred to as a target control plane core network device. That is, before the terminal device completes the handover, the terminal device accesses the first control plane core network device through the first access network device; after the terminal device completes the handover, the terminal device passes the second connection The network access device accesses the second control plane core network device.
  • the user plane core network devices corresponding to different control plane core network devices in the embodiments of the present application may be considered to be the same.
  • the terminal device may access the source control plane core network device and the user plane core network device respectively through the source access network device before the handover.
  • the terminal device sends a measurement report to the source access network device, and the source access network device can determine, according to the measurement report reported by the terminal device, whether the control plane core network device needs to be switched, if the source access network device determines that the cross-core network is inter-core.
  • the handover may be, for example, a handover between systems, or a handover between different core network devices between the same system
  • the source access network device may send a channel establishment request message to the target access network device
  • the target access network device may
  • the data channel between the source access network device and the target access network device is established according to the channel setup request message, and the data between the terminal device and the user plane core network device can be forwarded through the data channel; or the target access
  • the network device can directly establish a data channel between the target access network device and the user plane core network device according to the channel establishment request message, that is, the data between the terminal device and the user plane core network device can directly pass through.
  • the data channel is forwarded.
  • data can be forwarded through the data channel established by the target access network device during the handover process, and the reliability of data transmission can be improved as much as possible.
  • the data channel is a channel between the first access network device and the second access network device, and the channel setup request message carries the identifier of the first access network device.
  • the information of the data channel includes an identifier of the data channel and/or a configuration parameter of the data channel.
  • FIG. 3 is a schematic flowchart of a handover method 200 provided by an embodiment of the present application. As shown in FIG. 3, the method 200 includes some or all of the following:
  • the terminal device sends a measurement report to the source access network device, where the source access network device can determine whether to cross the core network according to the measurement report.
  • the source access network device determines to cross the core network, the source access network device sends a channel establishment request message to the target access network device.
  • the channel setup request message may carry the identifier of the source access network device.
  • the identifier of the source access network device is a Tunnel Endpoint Identifier (TEID).
  • TEID Tunnel Endpoint Identifier
  • the target access network device may establish a data channel between the source access network device and the target access network device. And the target access network device may separately allocate resources or identifiers for the data channel, for example, an address may be allocated for the data channel.
  • the target access network device may feed back some information configured for the data channel to the source access network device. For example, the target access network device may send the identifier of the data channel and/or the configuration parameter of the data channel to the source access network device. Further, the identifier of the data channel is an identifier of the target access network device, so that the source access network device can know that the target access network device establishes between the source access network device and the target access network device. Data channel.
  • the source access network device may forward the identifier of the data channel and/or the configuration parameter of the data channel to Terminal Equipment. Thereby the terminal device can transmit or receive data according to the information of the data channel.
  • the method 200 may further include: S250, the terminal device may send uplink data to the user plane core network device.
  • S250 can include:
  • the terminal device has switched from the source access network device to the target access network device, and the terminal device may send uplink data to the target access network device.
  • the target access network device may forward the uplink data to the source access network device by using a data channel between the established source access network device and the target access network device.
  • the source access network device may further forward the uplink data to the user plane core network device.
  • the method 200 may further include S260, where the user plane core network device may send downlink data to the terminal device.
  • the S260 can include:
  • the terminal device has switched from the source access network device to the target access network device, and the user plane core network device can send downlink data to the source access network device.
  • the source access network device may forward the downlink data to the target access network device by using a data channel between the source access network device and the target access network device.
  • the target access network device may further forward the downlink data to the terminal device.
  • the method 200 may further include:
  • the source access network device may also send a handover request to the source control plane core network device, and then the source control plane core network device may also be located from the user plane core network device. Obtain a packet data unit (PDU) session context.
  • the source access network device may also initiate a handover command to the terminal device, and after receiving the handover command, the terminal device may send a handover complete message to the target access network device.
  • PDU packet data unit
  • the target access network device may send a handover completion notification to the target control plane core network device, and the target control plane core network device may send the target control plane core network device to the user plane core network device.
  • the path switching message the user plane core network device can switch the path between the user plane core network device and the control plane core network device from the source control plane core network device to the target control plane core network device.
  • the target access network device may further release the data channel established between the target access network device and the source access network device after receiving the handover complete message sent by the terminal device.
  • the data channel is a channel between the second access network device and the user plane core network device, and the channel establishment request message carries the user plane core network.
  • FIG. 4 is a schematic flowchart of a handover method 300 provided by an embodiment of the present application. As shown in FIG. 4, the method 300 includes some or all of the following:
  • the terminal device sends a measurement report to the source access network device, where the source access network device can determine whether to cross the core network according to the measurement report.
  • the source access network device determines to cross the core network, the source access network device sends a channel establishment request message to the target access network device.
  • the channel setup request message may carry the identifier of the user plane core network device.
  • the identifier of the user plane core network device is address information of the user plane core network device.
  • the target access network device may directly establish a data channel between the target access network device and the user plane core network device. And the target access network device may separately allocate resources or identifiers for the data channel, for example, an address may be allocated for the data channel.
  • the target access network device may feed back some information configured for the data channel to the source access network device.
  • the information of the data channel may include an identification of the data channel and/or configuration parameters of the data channel.
  • the source access network device may forward the information of the data channel to the terminal device. Thereby the terminal device can transmit or receive data according to the information of the data channel.
  • the method 300 may further include: S350, the terminal device may send uplink data to the user plane core network device.
  • S350 can include:
  • the terminal device has switched from the source access network device to the target access network device, and the terminal device may send uplink data to the target access network device.
  • the target access network device may directly forward the uplink data to the user plane core network device by using a data channel established between the source access network device and the user plane core network device. Specifically, the target access network device has obtained the identifier of the user plane core network device from the channel establishment request message sent by the source access network device, so that the target access network device can be based on the identifier of the user plane core network device.
  • the uplink data is sent to the user plane core network device.
  • the method 300 may further include S360, where the user plane core network device may send downlink data to the terminal device.
  • the S360 can include:
  • the terminal device has switched from the source access network device to the target access network device, and the user plane core network device can send the data channel to the target access network device through the data channel established between the user plane core network device and the target access network device.
  • Downstream data
  • the target access network device may further forward the downlink data to the terminal device.
  • the method 300 may further include:
  • the target access network device may send a path switch message to the target control plane core network device, so that the target control plane core network
  • the device may notify the user that the core network device switches the path between the control plane core network device and the user plane core network device from the source control plane core network device to the target control surface core network device.
  • the path switch message may further include an identifier of the data channel, so that the target control plane core network device may indicate to the user plane core network device that the downlink data is sent to the terminal device through the data channel.
  • the size of the sequence numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not be implemented in the present application.
  • the implementation of the examples constitutes any limitation.
  • FIG. 5 shows a schematic block diagram of a handover method 400 of an embodiment of the present application. As shown in FIG. 5, the method 400 can be applied to the application scenario in FIG. 1, and the method 400 includes some or all of the following contents:
  • the second access network device receives the channel establishment request message sent by the first access network device;
  • the second access network device establishes a data channel according to the channel establishment request message, where the data channel is used for data transmission between the terminal device and the user plane core network device;
  • the second access network device sends the information of the data channel to the first access network device.
  • data can be forwarded through the data channel established by the target access network device during the handover process, thereby improving the reliability of data transmission as much as possible.
  • the data channel is a channel between the first access network device and the second access network device, and the channel setup request message carries the identifier of the first access network device.
  • the information of the data channel includes an identifier of the data channel and/or a configuration parameter of the data channel.
  • the data channel identifier is an identifier of the second access network device.
  • the method further includes: the second access network device receives uplink data sent by the terminal device; and the second access network device sends the first access network through the data channel The device forwards the uplink data.
  • the method further includes: receiving, by the second access network device, the downlink data sent by the user plane core network device from the first access network device by using the data channel;
  • the second access network device sends and forwards the downlink data to the terminal device.
  • the method further includes: after the second access network device receives the handover complete message sent by the terminal device, the second access network device releases the data channel, and/ Or sending a path switch message to the second control plane core network device.
  • the data channel is a channel between the second access network device and the user plane core network device, and the channel establishment request message carries an identifier of the user plane core network device, where The information of the data channel includes the identity of the data channel and/or configuration parameters of the data channel.
  • the identifier of the user plane core network device and/or the identifier of the data channel is used to send uplink data of the terminal device to the user plane core network device.
  • the method further includes: the second access network device sends a path switch message to the second control plane core network device, where the path switch message carries the identifier of the data channel, where the data is The identifier of the channel is used by the user plane core network device to send downlink data to the terminal device through the data channel.
  • the terminal device before the terminal device completes the handover, the terminal device accesses the first control plane core network device by using the first access network device; after the terminal device completes the handover, The terminal device accesses the second control plane core network device by using the second access network device.
  • the first control plane core network device and the second control plane core network device are core network devices in different communication systems or different core network devices in the same communication system.
  • the interaction between the second access network device and the first access network device described by the second access network device and related features, functions, and the like correspond to related features and functions of the first access network device. That is, what message is sent by the first access network device to the second access network device, and the second access network device receives the corresponding message from the first access network device.
  • the switching method according to the embodiment of the present application is described in detail above.
  • the switching device according to the embodiment of the present application will be described below with reference to FIG. 6 to FIG. 9.
  • the technical features described in the method embodiment are applicable to the following device embodiments.
  • FIG. 6 shows a schematic block diagram of an access network device 500 of an embodiment of the present application.
  • the access network device is a first access network device, and the access network device 500 includes:
  • the first sending unit 510 is configured to: when the terminal device switches from the first control plane core network device to the second control plane core network device, the first access network device sends a channel establishment request message to the second access network device;
  • the first receiving unit 520 is configured to receive information about a data channel established by the second access network device according to the channel establishment request message;
  • the second sending unit 530 is configured to send information about the data channel to the terminal device, where the information of the data channel is used for data transmission between the terminal device and the user plane core network device.
  • the access network device in the embodiment of the present application can forward data through the data channel established by the target access network device during the handover process, thereby improving the reliability of data transmission as much as possible.
  • the data channel is a channel between the first access network device and the second access network device, and the channel setup request message carries the identifier of the first access network device.
  • the information of the data channel includes an identifier of the data channel and/or a configuration parameter of the data channel.
  • the data channel identifier is an identifier of the second access network device.
  • the access network device further includes: a second receiving unit, configured to receive uplink data sent by the terminal device from the second access network device by using the data channel; And a sending unit, configured to forward the uplink data to the user plane core network device.
  • the access network device further includes: a third receiving unit, configured to receive downlink data sent by the user plane core network device; and a fourth sending unit, configured to use the data channel to The second access network device forwards the downlink data.
  • the data channel is a channel between the second access network device and the user plane core network device, and the channel establishment request message carries an identifier of the user plane core network device, where The information of the data channel includes the identity of the data channel and/or configuration parameters of the data channel.
  • the identifier of the user plane core network device and/or the identifier of the data channel is used to send uplink data of the terminal device to the user plane core network device.
  • the terminal device before the terminal device completes the handover, the terminal device accesses the first control plane core network device by using the first access network device; after the terminal device completes the handover, The terminal device accesses the second control plane core network device by using the second access network device.
  • the first control plane core network device and the second control plane core network device are core network devices in different communication systems or different core network devices in the same communication system.
  • FIG. 7 shows a schematic block diagram of an access network device 600 in an embodiment of the present application.
  • the access network device is a second access network device, and the access network device 600 includes:
  • the first receiving unit 610 is configured to receive, when the terminal device is switched from the first control plane core network device to the second control plane core network device, a channel establishment request message sent by the first access network device;
  • the establishing unit 620 is configured to establish a data channel according to the channel establishment request message, where the data channel is used for data transmission between the terminal device and the user plane core network device;
  • the first sending unit 630 is configured to send information of the data channel to the first access network device.
  • the access network device in the embodiment of the present application can forward data through the data channel established by the target access network device during the handover process, thereby improving the reliability of data transmission as much as possible.
  • the data channel is a channel between the first access network device and the second access network device, and the channel setup request message carries the identifier of the first access network device.
  • the information of the data channel includes an identifier of the data channel and/or a configuration parameter of the data channel.
  • the data channel identifier is an identifier of the second access network device.
  • the access network device further includes: a second receiving unit, configured to receive uplink data sent by the terminal device; and a second sending unit, configured to use the data channel to the first The access network device forwards the uplink data.
  • the access network device further includes: a third receiving unit, configured to receive downlink data sent by the user plane core network device from the first access network device by using the data channel a third sending unit, configured to send and forward the downlink data to the terminal device.
  • a third receiving unit configured to receive downlink data sent by the user plane core network device from the first access network device by using the data channel
  • a third sending unit configured to send and forward the downlink data to the terminal device.
  • the access network device further includes: a releasing unit, configured to release the data channel after the second access network device receives the handover complete message sent by the terminal device, and Or, the fourth sending unit is configured to send a path switching message to the second control plane core network device.
  • the data channel is a channel between the second access network device and the user plane core network device, and the channel establishment request message carries an identifier of the user plane core network device, where The information of the data channel includes the identity of the data channel and/or configuration parameters of the data channel.
  • the identifier of the user plane core network device and/or the identifier of the data channel is used to send uplink data of the terminal device to the user plane core network device.
  • the access network device further includes: a fifth sending unit, configured to send a path switch message to the second control plane core network device, where the path switch message carries the identifier of the data channel
  • the identifier of the data channel is used by the user plane core network device to send downlink data to the terminal device through the data channel.
  • the terminal device before the terminal device completes the handover, the terminal device accesses the first control plane core network device by using the first access network device; after the terminal device completes the handover, The terminal device accesses the second control plane core network device by using the second access network device.
  • the first control plane core network device and the second control plane core network device are core network devices in different communication systems or different core network devices in the same communication system.
  • the embodiment of the present application further provides an access network device 700, which may be the access network device 300 in FIG. 6, which can be used to perform the method 100 in FIG. Corresponding content of the first access network device.
  • the access network device 700 includes an input interface 710, an output interface 720, a processor 730, and a memory 740.
  • the input interface 710, the output interface 720, the processor 730, and the memory 740 can be connected by a bus system.
  • the memory 740 is for storing programs, instructions or code.
  • the processor 730 is configured to execute a program, an instruction or a code in the memory 740 to control the input interface 710 to receive a signal, control the output interface 720 to transmit a signal, and complete the operations in the foregoing method embodiments.
  • the access network device in the embodiment of the present application can forward data through the data channel established by the target access network device during the handover process, thereby improving the reliability of data transmission as much as possible.
  • the processor 730 may be a central processing unit (CPU), and the processor 730 may also be other general-purpose processors, digital signal processors, application specific integrated circuits, and ready-made Program gate arrays or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, and more.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the memory 740 can include read only memory and random access memory and provides instructions and data to the processor 730. A portion of the memory 740 can also include a non-volatile random access memory. For example, the memory 740 can also store information of the device type.
  • each content of the foregoing method may be completed by an integrated logic circuit of hardware in the processor 730 or an instruction in a form of software.
  • the content of the method disclosed in the embodiments of the present application may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 740, and the processor 730 reads the information in the memory 740 and combines its hardware to perform the contents of the above method. To avoid repetition, it will not be described in detail here.
  • each receiving unit in the access network device 500 can be implemented by the input interface 710 in FIG. 8, and each transmitting unit in the access network device 500 can be implemented by the output interface 720 in FIG.
  • the embodiment of the present application further provides a core network device 800, which may be the core network device 600 in FIG. 7, which can be used to execute a core corresponding to the method 400 in FIG.
  • the content of the network device includes an input interface 810, an output interface 820, a processor 830, and a memory 840.
  • the input interface 810, the output interface 820, the processor 830, and the memory 840 can be connected by a bus system.
  • the memory 840 is for storing programs, instructions or code.
  • the processor 830 is configured to execute a program, an instruction or a code in the memory 840 to control the input interface 810 to receive a signal, control the output interface 820 to transmit a signal, and complete the operations in the foregoing method embodiments.
  • the access network device in the embodiment of the present application can forward data through the data channel established by the target access network device during the handover process, thereby improving the reliability of data transmission as much as possible.
  • the processor 830 may be a central processing unit (CPU), and the processor 830 may also be other general-purpose processors, digital signal processors, application specific integrated circuits, and ready-made Program gate arrays or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, and more.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the memory 840 can include read only memory and random access memory and provides instructions and data to the processor 830. A portion of the memory 840 may also include a non-volatile random access memory. For example, the memory 840 can also store information of the device type.
  • each content of the foregoing method may be completed by an integrated logic circuit of hardware in the processor 830 or an instruction in a form of software.
  • the content of the method disclosed in the embodiments of the present application may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 840, and the processor 830 reads the information in the memory 840 and combines the hardware to complete the contents of the above method. To avoid repetition, it will not be described in detail here.
  • each of the transmitting units in the core network device 600 can be implemented by the output interface 820 in FIG.
  • the various receiving units in the core network device 600 can be implemented by the input interface 810 in FIG.
  • the setup unit and the release unit in the core network device 600 can be implemented by the processor 830 in FIG.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or may be Integrate into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, i.e., may be located in one place, or may be distributed over multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • This functionality if implemented as a software functional unit and sold or used as a standalone product, can be stored on a computer readable storage medium.
  • the technical solution of the present application which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including The instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of various embodiments of the present application.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

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Abstract

本申请实施例公开了一种切换方法和接入网设备，该切换方法包括：在终端设备从第一控制面核心网设备切换到第二控制面核心网设备时，第一接入网设备向第二接入网设备发送通道建立请求消息；该第一接入网设备接收该第二接入网设备根据该通道建立请求消息建立的数据通道的信息；该第一接入网设备向该终端设备发送该数据通道的信息，该数据通道的信息用于该终端设备与用户面核心网设备之间的数据传输。本申请实施例的方法和接入网设备，能够提高数据传输的可靠性。

Description

切换方法和接入网设备 技术领域
本申请实施例涉及通信领域，并且更具体地，涉及一种切换方法和接入网设备。
背景技术
在新空口(New Radio，NR)系统中，存在NR基站和长期演进(Long Term Evolution，LTE)基站分别或者同时接入分组核心演进(Evolved Packet Core，EPC)或者5G核心网。对于跨核心网的场景，在目前的切换过程中，可能会存在切换过程中有数据要传输的情况，若切换不及时，该部分数据的传输就得不到保障。
发明内容
有鉴于此，本申请实施例提供了一种切换方法和接入网设备，在切换过程中可以通过目标接入网设备建立的数据通道转发数据，从而能够尽量提高数据传输的可靠性。
第一方面，提供了一种切换方法，该方法包括：在终端设备从第一控制面核心网设备切换到第二控制面核心网设备时，第一接入网设备向第二接入网设备发送通道建立请求消息；该第一接入网设备接收该第二接入网设备根据该通道建立请求消息建立的数据通道的信息；该第一接入网设备向该终端设备发送该数据通道的信息，该数据通道的信息用于该终端设备与用户面核心网设备之间的数据传输。
在一种可能的实现方式中，该数据通道为该第一接入网设备与该第二接入网设备之间的通道，该通道建立请求消息携带该第一接入网设备的标识，该数据通道的信息包括该数据通道的标识和/或该数据通道的配置参数。
在一种可能的实现方式中，该数据通道标识为该第二接入网设备的标识。
在一种可能的实现方式中，该方法还包括：该第一接入网设备通过该数据通道从该第二接入网设备处接收该终端设备发送的上行数据；该第一接入网设备向该用户面核心网设备转发该上行数据。
在一种可能的实现方式中，该方法还包括：该第一接入网设备接收该用户面核心网设备发送的下行数据；该第一接入网设备通过该数据通道向该第二接入网设备转发该下行数据。
在一种可能的实现方式中，该数据通道为该第二接入网设备与该用户面核心网设备之间的通道，该通道建立请求消息携带该用户面核心网设备的标识，该数据通道的信息 包括该数据通道的标识和/或该数据通道的配置参数。
在一种可能的实现方式中，该用户面核心网设备的标识和/或该数据通道的标识用于将该终端设备的上行数据发送到该用户面核心网设备。
在一种可能的实现方式中，在该终端设备完成切换之前，该终端设备通过该第一接入网设备接入该第一控制面核心网设备；在该终端设备完成切换之后，该终端设备通过该第二接入网设备接入该第二控制面核心网设备。
在一种可能的实现方式中，该第一控制面核心网设备和该第二控制面核心网设备为不同通信系统中的核心网设备或同一通信系统中的不同核心网设备。
第二方面，提供了一种切换方法，该方法包括：在终端设备从第一控制面核心网设备切换到第二控制面核心网设备时，第二接入网设备接收第一接入网设备发送的通道建立请求消息；该第二接入网设备根据该通道建立请求消息建立数据通道，该数据通道用于该终端设备与用户面核心网设备之间的数据传输；该第二接入网设备向该第一接入网设备发送该数据通道的信息。
在一种可能的实现方式中，该数据通道为该第一接入网设备与该第二接入网设备之间的通道，该通道建立请求消息携带该第一接入网设备的标识，该数据通道的信息包括该数据通道的标识和/或该数据通道的配置参数。
在一种可能的实现方式中，该数据通道标识为该第二接入网设备的标识。
在一种可能的实现方式中，该方法还包括：该第二接入网设备接收该终端设备发送的上行数据；该第二接入网设备通过该数据通道向该第一接入网设备转发该上行数据。
在一种可能的实现方式中，该方法还包括：该第二接入网设备通过该数据通道从该第一接入网设备处接收该用户面核心网设备发送的下行数据；该第二接入网设备向该终端设备发送转发该下行数据。
在一种可能的实现方式中，该方法还包括：在该第二接入网设备接收到该终端设备发送的切换完成消息之后，该第二接入网设备释放该数据通道，和/或，向该第二控制面核心网设备发送路径切换消息。
在一种可能的实现方式中，该数据通道为该第二接入网设备与该用户面核心网设备之间的通道，该通道建立请求消息携带该用户面核心网设备的标识，该数据通道的信息包括该数据通道的标识和/或该数据通道的配置参数。
在一种可能的实现方式中，该用户面核心网设备的标识和/或该数据通道的标识用于将该终端设备的上行数据发送到该用户面核心网设备。
在一种可能的实现方式中，该方法还包括：该第二接入网设备向该第二控制面核心 网设备发送路径切换消息，该路径切换消息携带该数据通道的标识，该数据通道的标识用于该用户面核心网设备通过该数据通道向该终端设备发送下行数据。
在一种可能的实现方式中，在该终端设备完成切换之前，该终端设备通过该第一接入网设备接入该第一控制面核心网设备；在该终端设备完成切换之后，该终端设备通过该第二接入网设备接入该第二控制面核心网设备。
在一种可能的实现方式中，该第一控制面核心网设备和该第二控制面核心网设备为不同通信系统中的核心网设备或同一通信系统中的不同核心网设备。
第三方面，提供了一种接入网设备，用于执行上述第一方面或第一方面的任意可能的实现方式中的方法。具体地，该接入网设备包括用于执行上述第一方面或第一方面的任意可能的实现方式中的方法的单元。
第四方面，提供了一种接入网设备，用于执行上述第二方面或第二方面的任意可能的实现方式中的方法。具体地，该接入网设备包括用于执行上述第二方面或第二方面的任意可能的实现方式中的方法的单元。
第五方面，提供了一种接入网设备，该接入网设备包括：存储器、处理器、输入接口和输出接口。其中，存储器、处理器、输入接口和输出接口通过总线系统相连。该存储器用于存储指令，该处理器用于执行该存储器存储的指令，用于执行上述第一方面或第一方面的任意可能的实现方式中的方法。
第六方面，提供了一种接入网设备，该核心网设备包括：存储器、处理器、输入接口和输出接口。其中，存储器、处理器、输入接口和输出接口通过总线系统相连。该存储器用于存储指令，该处理器用于执行该存储器存储的指令，用于执行上述第二方面或第二方面的任意可能的实现方式中的方法。
第七方面，提供了一种计算机存储介质，用于储存为执行上述第一方面或第一方面的任意可能的实现方式中的方法，或者上述第二方面或第二方面的任意可能的实现方式中的方法所用的计算机软件指令，其包含用于执行上述方面所设计的程序。
第八方面，提供了一种包括指令的计算机程序产品，当其在计算机上运行时，使得计算机执行上述第一方面或第一方面的任一可选的实现方式中的方法，或者上述第二方面或第二方面的任一可选的实现方式中的方法。
本申请的这些方面或其他方面在以下实施例的描述中会更加简明易懂。
附图说明
图1示出了本申请实施例一个应用场景的示意图。
图2示出了本申请实施例的切换方法的示意性框图。
图3示出了本申请实施例的切换方法的另一示意性框图。
图4示出了本申请实施例的切换方法的再一示意性框图。
图5示出了本申请实施例的切换方法的再一示意性框图。
图6示出了本申请实施例的接入网设备的示意性框图。
图7示出了本申请实施例的接入网设备的另一示意性框图。
图8示出了本申请实施例的接入网设备的再一示意性框图。
图9示出了本申请实施例的接入网设备的再一示意性框图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述。
应理解，本申请实施例的技术方案可以应用于各种通信系统，例如：全球移动通讯(Global System of Mobile communication，GSM)系统、码分多址(Code Division Multiple Access，CDMA)系统、宽带码分多址(Wideband Code Division Multiple Access，WCDMA)系统、通用分组无线业务(General Packet Radio Service，GPRS)、长期演进(Long Term Evolved，LTE)系统、LTE频分双工(Frequency Division Duplex，FDD)系统、LTE时分双工(Time Division Duplex，TDD)、通用移动通信系统(Universal Mobile Telecommunication System，UMTS)、全球互联微波接入(Worldwide Interoperability for Microwave Access，WiMAX)通信系统、新无线(New Radio，NR)或未来的5G系统等。
特别地，本申请实施例的技术方案可以应用于各种基于非正交多址接入技术的通信系统，例如稀疏码多址接入(Sparse Code Multiple Access，SCMA)系统、低密度签名(Low Density Signature，LDS)系统等，当然SCMA系统和LDS系统在通信领域也可以被称为其他名称；进一步地，本申请实施例的技术方案可以应用于采用非正交多址接入技术的多载波传输系统，例如采用非正交多址接入技术正交频分复用(Orthogonal Frequency Division Multiplexing，OFDM)、滤波器组多载波(Filter Bank Multi-Carrier，FBMC)、通用频分复用(Generalized Frequency Division Multiplexing，GFDM)、滤波正交频分复用(Filtered-OFDM，F-OFDM)系统等。
本申请实施例中的终端设备可以指用户设备(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。接入终端可以是蜂窝电话、无绳电话、会话启动 协议(Session Initiation Protocol，SIP)电话、无线本地环路(Wireless Local Loop，WLL)站、个人数字处理(Personal Digital Assistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备，未来5G网络中的终端设备或者未来演进的公用陆地移动通信网络(Public Land Mobile Network，PLMN)中的终端设备等，本申请实施例并不限定。
本申请实施例中的接入网设备可以是用于与终端设备通信的设备，该接入网设备可以是GSM或CDMA中的基站(Base Transceiver Station，BTS)，也可以是WCDMA系统中的基站(NodeB，NB)，还可以是LTE系统中的演进型基站(Evolutional NodeB，eNB或eNodeB)，还可以是云无线接入网络(Cloud Radio Access Network，CRAN)场景下的无线控制器，或者该接入网设备可以为中继站、接入点、车载设备、可穿戴设备以及未来5G网络中的接入网设备等，本申请实施例并不限定。
应理解，本申请实施例的核心网设备可以是上述各种通信系统中的核心网设备。例如，可以是LTE系统的演进分组核心网(Evolved Packet Core)，还可以NR中下一代核心网(Next Generation Core，NGC)。本申请实施例中并不限定。
下面先结合图1对本申请实施例的应用场景进行介绍。如图1所示，UE既可以通过LTE中的基站接入LTE中的核心网EPC，也可以通过NR中的基站接入NR中的核心网NGC。应理解，本申请实施例的跨核心网可以是跨系统，例如，从NR中的核心网NGC切换到LTE中的核心网EPC；本申请实施例的跨核心网还可以是指同一通信系统下的不同核心网设备。例如，切换前后的两个核心网设备可以都是LTE中的核心网设备，也可以都是NR中的核心网设备。
在目前的跨核心网的方案中，源接入网可以根据测量门限值确定触发切换的时机，换句话说，是由源接入网设备确定是否是跨核心网之间的切换，如果是，则需要向源核心网设备发送切换请求，源核心网设备可以通知目标核心网设备进行资源的准备，进而可以触发终端设备进行切换。在现在的跨核心网的切换过程中，切换步骤过多，如果终端设备移动速度过快，在这期间又有数据需要传输，可能会导致数据传输失败。
图2示出了本申请实施例的切换方法100的示意性框图。如图2所示，该方法100可以适用于图1中的应用场景，该方法100包括以下部分或全部内容：
S110，在终端设备从第一控制面核心网设备切换到第二控制面核心网设备时，第一接入网设备向第二接入网设备发送通道建立请求消息；
S120，该第一接入网设备接收该第二接入网设备根据该通道建立请求消息建立的数据通道的信息；
S130，该第一接入网设备向该终端设备发送该数据通道的信息，该数据通道的信息用于该终端设备与用户面核心网设备之间的数据传输。
需要说明的是，可以将本申请实施例中的第一接入网设备称为源接入网设备，将第二接入网设备称为目标接入网设备。类似地，可以将第一控制面核心网设备称为源控制面核心网设备，第二控制面核心网设备称为目标控制面核心网设备。也就是说，在该终端设备完成切换之前，该终端设备通过该第一接入网设备接入该第一控制面核心网设备；在该终端设备完成切换之后，该终端设备通过该第二接入网设备接入该第二控制面核心网设备。本申请实施例中的不同控制面核心网设备对应的用户面核心网设备可以认为是同一个。
具体地，终端设备在切换之前可以通过源接入网设备分别接入源控制面核心网设备和用户面核心网设备。终端设备会向源接入网设备发送测量报告，源接入网设备可以基于终端设备上报的测量报告判断是否需要切换控制面核心网设备，如果源接入网设备判断是跨核心网之间的切换，例如可以是系统间的切换，或者是同一系统间的不同核心网设备之间的切换，则源接入网设备可以向目标接入网设备发送通道建立请求消息，目标接入网设备可以根据该通道建立请求消息建立源接入网设备与目标接入网设备之间的数据通道，那么终端设备与用户面核心网设备之间的数据则可以通过该数据通道进行转发；或者目标接入网设备也可以直接根据该通道建立请求消息之间建立目标接入网设备与用户面核心网设备之间的数据通道，也就是说，终端设备与用户面核心网设备之间的数据可以直接通过该数据通道进行转发。
因此，本申请实施例的切换方法，在切换过程中可以通过目标接入网设备建立的数据通道转发数据，可以尽量提高数据传输的可靠性。
可选地，在本申请实施例中，该数据通道为该第一接入网设备与该第二接入网设备之间的通道，该通道建立请求消息携带该第一接入网设备的标识，该数据通道的信息包括该数据通道的标识和/或该数据通道的配置参数。
图3是本申请实施例提供的切换方法200的示意性流程图。如图3所示，该方法200包括以下部分或全部内容：
S210，终端设备向源接入网设备发送测量报告，源接入网设备可以根据测量报告判断是否跨核心网。
S220，若源接入网设备判断跨核心网，则源接入网设备向目标接入网设备发送通道建立请求消息。该通道建立请求消息可以携带源接入网设备的标识。例如，该源接入网设备的标识为隧道端点标识符(Tunnel Endpoint Identifier，TEID)。目标接入网设备在接收 到该通道建立请求消息之后，可以建立源接入网设备与目标接入网设备之间的数据通道。并且目标接入网设备可以为该数据通道分别资源或者标识，例如，可以为该数据通道分配地址。
S230，目标接入网设备可以将为数据通道配置的一些信息反馈给源接入网设备。例如，目标接入网设备可以将该数据通道的标识和/或该数据通道的配置参数发送给源接入网设备。进一步地，该数据通道的标识为目标接入网设备的标识，这样的话，源接入网设备就可以知道目标接入网设备建立的是源接入网设备与目标接入网设备之间的数据通道。
S240，源接入网设备在接收到目标接入网发送的该数据通道的标识和/或该数据通道的配置参数之后，可以将该数据通道的标识和/或该数据通道的配置参数转发给终端设备。从而终端设备可以根据该数据通道的信息发送或接收数据。
可选地，该方法200还可以包括S250，终端设备可以向用户面核心网设备发送上行数据。进一步地，该S250可以包括：
S251，终端设备已经从源接入网设备切换到目标接入网设备，终端设备可以向目标接入网设备发送上行数据；
S252，目标接入网设备可以通过建立的源接入网设备与目标接入网设备之间的数据通道向源接入网设备转发该上行数据；
S253，源接入网设备可以进一步地将该上行数据转发到用户面核心网设备处。
可选地，该方法200还可以包括S260，用户面核心网设备可以向终端设备发送下行数据。进一步地，该S260可以包括：
S261，终端设备已经从源接入网设备切换到目标接入网设备，用户面核心网设备可以向源接入网设备发送下行数据；
S262，源接入网设备可以通过建立的源接入网设备与目标接入网设备之间的数据通道向目标接入网设备转发该下行数据；
S263，目标接入网设备可以进一步地将该下行数据转发到终端设备处。
可选地，该方法200还可以包括：
当源接入网设备确定是跨核心网之间的切换，源接入网设备还可以向源控制面核心网设备发送切换请求，进而源控制面核心网设备还可以从用户面核心网设备处获取分组数据单元(packet data unit，PDU)会话上下文。源接入网设备还可以向终端设备发起切换命令，终端设备在接收到该切换命令之后，可以向目标接入网设备发送切换完成消息。
可选地，目标接入网设备在接收到终端设备发送的切换完成消息之后，可以向目标 控制面核心网设备发送切换完成通知，那么目标控制面核心网设备就可以向用户面核心网设备发送路径切换消息，用户面核心网设备就可以将用户面核心网设备与控制面核心网设备之间的路径从源控制面核心网设备切换到目标控制面核心网设备。
可选地，目标接入网设备还可以在接收到终端设备发送的切换完成消息之后，释放目标接入网设备与源接入网设备之间建立的数据通道。
可选地，在本申请实施例中，所述数据通道为所述第二接入网设备与所述用户面核心网设备之间的通道，所述通道建立请求消息携带所述用户面核心网设备的标识，所述用户面核心网设备的标识用于所述第二接入网设备通过所述数据通道将所述终端设备发送的上行数据发送到所述用户面核心网设备。
图4是本申请实施例提供的切换方法300的示意性流程图。如图4所示，该方法300包括以下部分或全部内容：
S310，终端设备向源接入网设备发送测量报告，源接入网设备可以根据测量报告判断是否跨核心网。
S320，若源接入网设备判断跨核心网，则源接入网设备向目标接入网设备发送通道建立请求消息。该通道建立请求消息可以携带用户面核心网设备的标识。例如，该用户面核心网设备的标识为该用户面核心网设备的地址信息。目标接入网设备在接收到该通道建立请求消息之后，可以直接建立目标接入网设备与用户面核心网设备之间的数据通道。并且目标接入网设备可以为该数据通道分别资源或者标识，例如，可以为该数据通道分配地址。
S330，目标接入网设备可以将为数据通道配置的一些信息反馈给源接入网设备。该数据通道的信息可以包括该数据通道的标识和/或该数据通道的配置参数。
S340，源接入网设备在接收到目标接入网发送的该数据通道的信息之后，可以将该数据通道的信息转发给终端设备。从而终端设备可以根据该数据通道的信息发送或接收数据。
可选地，该方法300还可以包括S350，终端设备可以向用户面核心网设备发送上行数据。进一步地，该S350可以包括：
S351，终端设备已经从源接入网设备切换到目标接入网设备，终端设备可以向目标接入网设备发送上行数据；
S352，目标接入网设备可以通过在源接入网设备与用户面核心网设备之间建立的数据通道直接向用户面核心网设备转发该上行数据。具体地，目标接入网设备已经从源接入网设备发送的通道建立请求消息中获取到该用户面核心网设备的标识，从而目标接入 网设备就可以根据该用户面核心网设备的标识将该上行数据发送到用户面核心网设备处。
可选地，该方法300还可以包括S360，用户面核心网设备可以向终端设备发送下行数据。进一步地，该S360可以包括：
S361，终端设备已经从源接入网设备切换到目标接入网设备，用户面核心网设备可以通过用户面核心网设备和目标接入网设备之间建立的数据通道向目标接入网设备发送下行数据；
S362，目标接入网设备可以进一步地将该下行数据转发到终端设备处。
可选地，该方法300还可以包括：
在目标接入网设备建立了目标接入网设备与用户面核心网设备之间的数据通道之后，目标接入网设备可以向目标控制面核心网设备发送路径切换消息，使得目标控制面核心网设备可以通知用户面核心网设备将控制面核心网设备与用户面核心网设备之间的路径从源控制面核心网设备切换为目标控制面核心网设备。进一步地，该路径切换消息还可以包括数据信道的标识，使得目标控制面核心网设备可以向用户面核心网设备指示通过该数据信道向终端设备发送下行数据。
还应理解，在本申请的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
图5示出了本申请实施例的切换方法400的示意性框图。如图5所示，该方法400可以适用于图1中的应用场景，该方法400包括以下部分或全部内容：
S410，在终端设备从第一控制面核心网设备切换到第二控制面核心网设备时，第二接入网设备接收第一接入网设备发送的通道建立请求消息；
S420，该第二接入网设备根据该通道建立请求消息建立数据通道，该数据通道用于该终端设备与用户面核心网设备之间的数据传输；
S430，该第二接入网设备向该第一接入网设备发送该数据通道的信息。
因此，本申请实施例的切换方法，在切换过程中可以通过目标接入网设备建立的数据通道转发数据，从而能够尽量提高数据传输的可靠性。
可选地，在本申请实施例中，该数据通道为该第一接入网设备与该第二接入网设备之间的通道，该通道建立请求消息携带该第一接入网设备的标识，该数据通道的信息包括该数据通道的标识和/或该数据通道的配置参数。
可选地，在本申请实施例中，该数据通道标识为该第二接入网设备的标识。
可选地，在本申请实施例中，该方法还包括：该第二接入网设备接收该终端设备发送的上行数据；该第二接入网设备通过该数据通道向该第一接入网设备转发该上行数据。
可选地，在本申请实施例中，该方法还包括：该第二接入网设备通过该数据通道从该第一接入网设备处接收该用户面核心网设备发送的下行数据；该第二接入网设备向该终端设备发送转发该下行数据。
可选地，在本申请实施例中，该方法还包括：在该第二接入网设备接收到该终端设备发送的切换完成消息之后，该第二接入网设备释放该数据通道，和/或，向该第二控制面核心网设备发送路径切换消息。
可选地，在本申请实施例中，该数据通道为该第二接入网设备与该用户面核心网设备之间的通道，该通道建立请求消息携带该用户面核心网设备的标识，该数据通道的信息包括该数据通道的标识和/或该数据通道的配置参数。
可选地，在本申请实施例中，该用户面核心网设备的标识和/或该数据通道的标识用于将该终端设备的上行数据发送到该用户面核心网设备。
可选地，在本申请实施例中，该方法还包括：该第二接入网设备向该第二控制面核心网设备发送路径切换消息，该路径切换消息携带该数据通道的标识，该数据通道的标识用于该用户面核心网设备通过该数据通道向该终端设备发送下行数据。
可选地，在本申请实施例中，在该终端设备完成切换之前，该终端设备通过该第一接入网设备接入该该第一控制面核心网设备；在该终端设备完成切换之后，该终端设备通过该第二接入网设备接入该第二控制面核心网设备。
可选地，在本申请实施例中，该第一控制面核心网设备和该第二控制面核心网设备为不同通信系统中的核心网设备或同一通信系统中的不同核心网设备。
应理解，第二接入网设备描述的第二接入网设备与第一接入网设备之间的交互及相关特性、功能等与第一接入网设备的相关特性、功能相应。也就是说，第一接入网设备向第二接入网设备发送什么消息，第二接入网设备从第一接入网设备接收相应的消息。
上文中详细描述了根据本申请实施例的切换方法，下面将结合图6至图9，描述根据本申请实施例的切换装置，方法实施例所描述的技术特征适用于以下装置实施例。
图6示出了本申请实施例的接入网设备500的示意性框图。如图6所示，该接入网设备为第一接入网设备，该接入网设备500包括：
第一发送单元510，用于在终端设备从第一控制面核心网设备切换到第二控制面核心网设备时，第一接入网设备向第二接入网设备发送通道建立请求消息；
第一接收单元520，用于接收该第二接入网设备根据该通道建立请求消息建立的数据 通道的信息；
第二发送单元530，用于向该终端设备发送该数据通道的信息，该数据通道的信息用于该终端设备与用户面核心网设备之间的数据传输。
因此，本申请实施例的接入网设备，在切换过程中可以通过目标接入网设备建立的数据通道转发数据，从而能够尽量提高数据传输的可靠性。
可选地，在本申请实施例中，该数据通道为该第一接入网设备与该第二接入网设备之间的通道，该通道建立请求消息携带该第一接入网设备的标识，该数据通道的信息包括该数据通道的标识和/或该数据通道的配置参数。
可选地，在本申请实施例中，该数据通道标识为该第二接入网设备的标识。
可选地，在本申请实施例中，该接入网设备还包括：第二接收单元，用于通过该数据通道从该第二接入网设备处接收该终端设备发送的上行数据；第三发送单元，用于向该用户面核心网设备转发该上行数据。
可选地，在本申请实施例中，该接入网设备还包括：第三接收单元，用于接收该用户面核心网设备发送的下行数据；第四发送单元，用于通过该数据通道向该第二接入网设备转发该下行数据。
可选地，在本申请实施例中，该数据通道为该第二接入网设备与该用户面核心网设备之间的通道，该通道建立请求消息携带该用户面核心网设备的标识，该数据通道的信息包括该数据通道的标识和/或该数据通道的配置参数。
可选地，在本申请实施例中，该用户面核心网设备的标识和/或该数据通道的标识用于将该终端设备的上行数据发送到该用户面核心网设备。
可选地，在本申请实施例中，在该终端设备完成切换之前，该终端设备通过该第一接入网设备接入该该第一控制面核心网设备；在该终端设备完成切换之后，该终端设备通过该第二接入网设备接入该第二控制面核心网设备。
可选地，在本申请实施例中，该第一控制面核心网设备和该第二控制面核心网设备为不同通信系统中的核心网设备或同一通信系统中的不同核心网设备。
图7示出了本申请实施例的接入网设备600的示意性框图。如图7所示，该接入网设备为第二接入网设备，该接入网设备600包括：
第一接收单元610，用于在终端设备从第一控制面核心网设备切换到第二控制面核心网设备时，接收第一接入网设备发送的通道建立请求消息；
建立单元620，用于根据该通道建立请求消息建立数据通道，该数据通道用于该终端设备与用户面核心网设备之间的数据传输；
第一发送单元630，用于向该第一接入网设备发送该数据通道的信息。
因此，本申请实施例的接入网设备，在切换过程中可以通过目标接入网设备建立的数据通道转发数据，从而能够尽量提高数据传输的可靠性。
可选地，在本申请实施例中，该数据通道为该第一接入网设备与该第二接入网设备之间的通道，该通道建立请求消息携带该第一接入网设备的标识，该数据通道的信息包括该数据通道的标识和/或该数据通道的配置参数。
可选地，在本申请实施例中，该数据通道标识为该第二接入网设备的标识。
可选地，在本申请实施例中，该接入网设备还包括：第二接收单元，用于接收该终端设备发送的上行数据；第二发送单元，用于通过该数据通道向该第一接入网设备转发该上行数据。
可选地，在本申请实施例中，该接入网设备还包括：第三接收单元，用于通过该数据通道从该第一接入网设备处接收该用户面核心网设备发送的下行数据；第三发送单元，用于向该终端设备发送转发该下行数据。
可选地，在本申请实施例中，该接入网设备还包括：释放单元，用于在该第二接入网设备接收到该终端设备发送的切换完成消息之后，释放该数据通道，和/或，第四发送单元，用于向该第二控制面核心网设备发送路径切换消息。
可选地，在本申请实施例中，该数据通道为该第二接入网设备与该用户面核心网设备之间的通道，该通道建立请求消息携带该用户面核心网设备的标识，该数据通道的信息包括该数据通道的标识和/或该数据通道的配置参数。
可选地，在本申请实施例中，该用户面核心网设备的标识和/或该数据通道的标识用于将该终端设备的上行数据发送到该用户面核心网设备。
可选地，在本申请实施例中，该接入网设备还包括：第五发送单元，用于向该第二控制面核心网设备发送路径切换消息，该路径切换消息携带该数据通道的标识，该数据通道的标识用于该用户面核心网设备通过该数据通道向该终端设备发送下行数据。
可选地，在本申请实施例中，在该终端设备完成切换之前，该终端设备通过该第一接入网设备接入该该第一控制面核心网设备；在该终端设备完成切换之后，该终端设备通过该第二接入网设备接入该第二控制面核心网设备。
可选地，在本申请实施例中，该第一控制面核心网设备和该第二控制面核心网设备为不同通信系统中的核心网设备或同一通信系统中的不同核心网设备。
如图8所示，本申请实施例还提供了一种接入网设备700，该接入网设备700可以是图6中的接入网设备300，其能够用于执行与图2中方法100对应的第一接入网设备的内 容。该接入网设备700包括：输入接口710、输出接口720、处理器730以及存储器740，该输入接口710、输出接口720、处理器730和存储器740可以通过总线系统相连。该存储器740用于存储包括程序、指令或代码。该处理器730，用于执行该存储器740中的程序、指令或代码，以控制输入接口710接收信号、控制输出接口720发送信号以及完成前述方法实施例中的操作。
因此，本申请实施例的接入网设备，在切换过程中可以通过目标接入网设备建立的数据通道转发数据，从而能够尽量提高数据传输的可靠性。
应理解，在本申请实施例中，该处理器730可以是中央处理单元(Central Processing Unit，CPU)，该处理器730还可以是其他通用处理器、数字信号处理器、专用集成电路、现成可编程门阵列或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
该存储器740可以包括只读存储器和随机存取存储器，并向处理器730提供指令和数据。存储器740的一部分还可以包括非易失性随机存取存储器。例如，存储器740还可以存储设备类型的信息。
在实现过程中，上述方法的各内容可以通过处理器730中的硬件的集成逻辑电路或者软件形式的指令完成。结合本申请实施例所公开的方法的内容可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器740，处理器730读取存储器740中的信息，结合其硬件完成上述方法的内容。为避免重复，这里不再详细描述。
一个具体的实施方式中，接入网设备500中的各接收单元可以由图8中的输入接口710实现，接入网设备500中的各发送单元可以由图8中的输出接口720实现。
如图9所示，本申请实施例还提供了一种核心网设备800，该核心网设备800可以是图7中的核心网设备600，其能够用于执行与图5中方法400对应的核心网设备的内容。该核心网设备800包括：输入接口810、输出接口820、处理器830以及存储器840，该输入接口810、输出接口820、处理器830和存储器840可以通过总线系统相连。该存储器840用于存储包括程序、指令或代码。该处理器830，用于执行该存储器840中的程序、指令或代码，以控制输入接口810接收信号、控制输出接口820发送信号以及完成前述方法实施例中的操作。
因此，本申请实施例的接入网设备，在切换过程中可以通过目标接入网设备建立的数据通道转发数据，从而能够尽量提高数据传输的可靠性。
应理解，在本申请实施例中，该处理器830可以是中央处理单元(Central Processing Unit，CPU)，该处理器830还可以是其他通用处理器、数字信号处理器、专用集成电路、现成可编程门阵列或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
该存储器840可以包括只读存储器和随机存取存储器，并向处理器830提供指令和数据。存储器840的一部分还可以包括非易失性随机存取存储器。例如，存储器840还可以存储设备类型的信息。
在实现过程中，上述方法的各内容可以通过处理器830中的硬件的集成逻辑电路或者软件形式的指令完成。结合本申请实施例所公开的方法的内容可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器840，处理器830读取存储器840中的信息，结合其硬件完成上述方法的内容。为避免重复，这里不再详细描述。
一个具体的实施方式中，核心网设备600中的各个发送单元可以由图9中的输出接口820实现。核心网设备600中的各个接收单元可以由图9中的输入接口810实现。核心网设备600中的建立单元和释放单元可以由图9中的处理器830实现。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，该单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
该作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网 络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
该功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory，ROM)、随机存取存储器(Random Access Memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应该以权利要求的保护范围为准。

Claims (40)

  1. 一种切换方法，其特征在于，包括：
    在终端设备从第一控制面核心网设备切换到第二控制面核心网设备时，第一接入网设备向第二接入网设备发送通道建立请求消息；
    所述第一接入网设备接收所述第二接入网设备根据所述通道建立请求消息建立的数据通道的信息；
    所述第一接入网设备向所述终端设备发送所述数据通道的信息，所述数据通道的信息用于所述终端设备与用户面核心网设备之间的数据传输。
  2. 根据权利要求1所述的方法，其特征在于，所述数据通道为所述第一接入网设备与所述第二接入网设备之间的通道，所述通道建立请求消息携带所述第一接入网设备的标识，所述数据通道的信息包括所述数据通道的标识和/或所述数据通道的配置参数。
  3. 根据权利要求2所述的方法，其特征在于，所述数据通道标识为所述第二接入网设备的标识。
  4. 根据权利要求2或3所述的方法，其特征在于，所述方法还包括：
    所述第一接入网设备通过所述数据通道从所述第二接入网设备处接收所述终端设备发送的上行数据；
    所述第一接入网设备向所述用户面核心网设备转发所述上行数据。
  5. 根据权利要求2至4中任一项所述的方法，其特征在于，所述方法还包括：
    所述第一接入网设备接收所述用户面核心网设备发送的下行数据；
    所述第一接入网设备通过所述数据通道向所述第二接入网设备转发所述下行数据。
  6. 根据权利要求1所述的方法，其特征在于，所述数据通道为所述第二接入网设备与所述用户面核心网设备之间的通道，所述通道建立请求消息携带所述用户面核心网设备的标识，所述数据通道的信息包括所述数据通道的标识和/或所述数据通道的配置参数。
  7. 根据权利要求6所述的方法，其特征在于，所述用户面核心网设备的标识和/或所述数据通道的标识用于将所述终端设备的上行数据发送到所述用户面核心网设备。
  8. 根据权利要求1至7中任一项所述的方法，其特征在于，在所述终端设备完成切换之前，所述终端设备通过所述第一接入网设备接入所述第一控制面核心网设备；在所述终端设备完成切换之后，所述终端设备通过所述第二接入网设备接入所述第二控制面核心网设备。
  9. 根据权利要求1至8中任一项所述的方法，其特征在于，所述第一控制面核心网 设备和所述第二控制面核心网设备为不同通信系统中的核心网设备或同一通信系统中的不同核心网设备。
  10. 一种切换方法，其特征在于，包括：
    在终端设备从第一控制面核心网设备切换到第二控制面核心网设备时，第二接入网设备接收第一接入网设备发送的通道建立请求消息；
    所述第二接入网设备根据所述通道建立请求消息建立数据通道，所述数据通道用于所述终端设备与用户面核心网设备之间的数据传输；
    所述第二接入网设备向所述第一接入网设备发送所述数据通道的信息。
  11. 根据权利要求10所述的方法，其特征在于，所述数据通道为所述第一接入网设备与所述第二接入网设备之间的通道，所述通道建立请求消息携带所述第一接入网设备的标识，所述数据通道的信息包括所述数据通道的标识和/或所述数据通道的配置参数。
  12. 根据权利要求11所述的方法，其特征在于，所述数据通道标识为所述第二接入网设备的标识。
  13. 根据权利要求11或12所述的方法，其特征在于，所述方法还包括：
    所述第二接入网设备接收所述终端设备发送的上行数据；
    所述第二接入网设备通过所述数据通道向所述第一接入网设备转发所述上行数据。
  14. 根据权利要求11至13中任一项所述的方法，其特征在于，所述方法还包括：
    所述第二接入网设备通过所述数据通道从所述第一接入网设备处接收所述用户面核心网设备发送的下行数据；
    所述第二接入网设备向所述终端设备发送转发所述下行数据。
  15. 根据权利要求11至14中任一项所述的方法，其特征在于，所述方法还包括：
    在所述第二接入网设备接收到所述终端设备发送的切换完成消息之后，所述第二接入网设备释放所述数据通道，和/或，向所述第二控制面核心网设备发送路径切换消息。
  16. 根据权利要求10所述的方法，其特征在于，所述数据通道为所述第二接入网设备与所述用户面核心网设备之间的通道，所述通道建立请求消息携带所述用户面核心网设备的标识，所述数据通道的信息包括所述数据通道的标识和/或所述数据通道的配置参数。
  17. 根据权利要求16所述的方法，其特征在于，所述用户面核心网设备的标识和/或所述数据通道的标识用于将所述终端设备的上行数据发送到所述用户面核心网设备。
  18. 根据权利要求16或17所述的方法，其特征在于，所述方法还包括：
    所述第二接入网设备向所述第二控制面核心网设备发送路径切换消息，所述路径切 换消息携带所述数据通道的标识，所述数据通道的标识用于所述用户面核心网设备通过所述数据通道向所述终端设备发送下行数据。
  19. 根据权利要求10至18中任一项所述的方法，其特征在于，在所述终端设备完成切换之前，所述终端设备通过所述第一接入网设备接入所述第一控制面核心网设备；在所述终端设备完成切换之后，所述终端设备通过所述第二接入网设备接入所述第二控制面核心网设备。
  20. 根据权利要求10至19中任一项所述的方法，其特征在于，所述第一控制面核心网设备和所述第二控制面核心网设备为不同通信系统中的核心网设备或同一通信系统中的不同核心网设备。
  21. 一种接入网设备，其特征在于，所述接入网设备为第一接入网设备，所述接入网设备包括：
    第一发送单元，用于在终端设备从第一控制面核心网设备切换到第二控制面核心网设备时，第一接入网设备向第二接入网设备发送通道建立请求消息；
    第一接收单元，用于接收所述第二接入网设备根据所述通道建立请求消息建立的数据通道的信息；
    第二发送单元，用于向所述终端设备发送所述数据通道的信息，所述数据通道的信息用于所述终端设备与用户面核心网设备之间的数据传输。
  22. 根据权利要求21所述的接入网设备，其特征在于，所述数据通道为所述第一接入网设备与所述第二接入网设备之间的通道，所述通道建立请求消息携带所述第一接入网设备的标识，所述数据通道的信息包括所述数据通道的标识和/或所述数据通道的配置参数。
  23. 根据权利要求22所述的接入网设备，其特征在于，所述数据通道标识为所述第二接入网设备的标识。
  24. 根据权利要求22或23所述的接入网设备，其特征在于，所述接入网设备还包括：
    第二接收单元，用于通过所述数据通道从所述第二接入网设备处接收所述终端设备发送的上行数据；
    第三发送单元，用于向所述用户面核心网设备转发所述上行数据。
  25. 根据权利要求22至24中任一项所述的接入网设备，其特征在于，所述接入网设备还包括：
    第三接收单元，用于接收所述用户面核心网设备发送的下行数据；
    第四发送单元，用于通过所述数据通道向所述第二接入网设备转发所述下行数据。
  26. 根据权利要求21所述的接入网设备，其特征在于，所述数据通道为所述第二接入网设备与所述用户面核心网设备之间的通道，所述通道建立请求消息携带所述用户面核心网设备的标识，所述数据通道的信息包括所述数据通道的标识和/或所述数据通道的配置参数。
  27. 根据权利要求26所述的接入网设备，其特征在于，所述用户面核心网设备的标识和/或所述数据通道的标识用于将所述终端设备的上行数据发送到所述用户面核心网设备。
  28. 根据权利要求21至27中任一项所述的接入网设备，其特征在于，在所述终端设备完成切换之前，所述终端设备通过所述第一接入网设备接入所述第一控制面核心网设备；在所述终端设备完成切换之后，所述终端设备通过所述第二接入网设备接入所述第二控制面核心网设备。
  29. 根据权利要求21至28中任一项所述的接入网设备，其特征在于，所述第一控制面核心网设备和所述第二控制面核心网设备为不同通信系统中的核心网设备或同一通信系统中的不同核心网设备。
  30. 一种接入网设备，其特征在于，所述接入网设备为第二接入网设备，所述接入网设备包括：
    第一接收单元，用于在终端设备从第一控制面核心网设备切换到第二控制面核心网设备时，接收第一接入网设备发送的通道建立请求消息；
    建立单元，用于根据所述通道建立请求消息建立数据通道，所述数据通道用于所述终端设备与用户面核心网设备之间的数据传输；
    第一发送单元，用于向所述第一接入网设备发送所述数据通道的信息。
  31. 根据权利要求30所述的接入网设备，其特征在于，所述数据通道为所述第一接入网设备与所述第二接入网设备之间的通道，所述通道建立请求消息携带所述第一接入网设备的标识，所述数据通道的信息包括所述数据通道的标识和/或所述数据通道的配置参数。
  32. 根据权利要求31所述的接入网设备，其特征在于，所述数据通道标识为所述第二接入网设备的标识。
  33. 根据权利要求31或32所述的接入网设备，其特征在于，所述接入网设备还包括：
    第二接收单元，用于接收所述终端设备发送的上行数据；
    第二发送单元，用于通过所述数据通道向所述第一接入网设备转发所述上行数据。
  34. 根据权利要求31至33中任一项所述的接入网设备，其特征在于，所述接入网设备还包括：
    第三接收单元，用于通过所述数据通道从所述第一接入网设备处接收所述用户面核心网设备发送的下行数据；
    第三发送单元，用于向所述终端设备发送转发所述下行数据。
  35. 根据权利要求31至34中任一项所述的接入网设备，其特征在于，所述接入网设备还包括：
    释放单元，用于在所述第二接入网设备接收到所述终端设备发送的切换完成消息之后，释放所述数据通道，和/或，
    第四发送单元，用于向所述第二控制面核心网设备发送路径切换消息。
  36. 根据权利要求30所述的接入网设备，其特征在于，所述数据通道为所述第二接入网设备与所述用户面核心网设备之间的通道，所述通道建立请求消息携带所述用户面核心网设备的标识，所述数据通道的信息包括所述数据通道的标识和/或所述数据通道的配置参数。
  37. 根据权利要求36所述的接入网设备，其特征在于，所述用户面核心网设备的标识和/或所述数据通道的标识用于将所述终端设备的上行数据发送到所述用户面核心网设备。
  38. 根据权利要求36或37所述的接入网设备，其特征在于，所述接入网设备还包括：
    第五发送单元，用于向所述第二控制面核心网设备发送路径切换消息，所述路径切换消息携带所述数据通道的标识，所述数据通道的标识用于所述用户面核心网设备通过所述数据通道向所述终端设备发送下行数据。
  39. 根据权利要求30至38中任一项所述的接入网设备，其特征在于，在所述终端设备完成切换之前，所述终端设备通过所述第一接入网设备接入所述第一控制面核心网设备；在所述终端设备完成切换之后，所述终端设备通过所述第二接入网设备接入所述第二控制面核心网设备。
  40. 根据权利要求30至39中任一项所述的接入网设备，其特征在于，所述第一控制面核心网设备和所述第二控制面核心网设备为不同通信系统中的核心网设备或同一通信系统中的不同核心网设备。
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