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WO2019037500A1 - 一种选择无线接入网设备的方法及装置 - Google Patents

一种选择无线接入网设备的方法及装置 Download PDF

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Publication number
WO2019037500A1
WO2019037500A1 PCT/CN2018/088917 CN2018088917W WO2019037500A1 WO 2019037500 A1 WO2019037500 A1 WO 2019037500A1 CN 2018088917 W CN2018088917 W CN 2018088917W WO 2019037500 A1 WO2019037500 A1 WO 2019037500A1
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WO
WIPO (PCT)
Prior art keywords
ladn
network
ran device
ran
session
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2018/088917
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English (en)
French (fr)
Inventor
李永翠
唐廷芳
李岩
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Publication of WO2019037500A1 publication Critical patent/WO2019037500A1/zh
Priority to US16/796,550 priority Critical patent/US11140592B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—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
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00835—Determination of neighbour cell lists
    • H04W36/008357—Determination of target cell based on access point [AP] properties, e.g. AP service capabilities
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • 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
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00838—Resource reservation for handover
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/20—Interfaces between hierarchically similar devices between access points

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method and apparatus for selecting a radio access network device.
  • the Local Area Data Network is a network deployed in the fifth generation of mobile communication technology (the 5th-Generation, 5G), mainly for enterprises, stadium activities, concert halls and other scenarios.
  • the LADN features include: The LADN can only be accessed when the terminal device is located in the service area (SA) of the LADN. When the terminal device leaves the LA of the LADN, the LADN network cannot be accessed, and the session (LADN session) that previously accessed the LADN is also disconnected.
  • the source radio access network (RAN) device of the serving terminal device makes a handover decision according to the measurement report of the terminal device, and then selects one of the candidate RAN devices.
  • the target RAN device sends a handover request to the target RAN device.
  • the target device may not be able to access the LADN through the switched target RAN device.
  • RAN device 1 abbreviated as RAN1
  • RAN device 2 abbreviated as RAN2
  • RAN device 3 abbreviated as RAN3
  • LADN SA the coverage of LADN SA
  • the terminal equipment is located within the coverage of RAN1.
  • RAN1 may select RAN3 as the target of handover, thereby reducing the user experience.
  • Embodiments of the present invention provide a method and apparatus for selecting a radio access network device.
  • an embodiment of the present application provides a method for selecting a radio access network RAN device, where the method includes: acquiring, by a first radio access network RAN device, capability information of a second RAN device; The RAN device sends a handover request message.
  • the capability information is used to indicate a local data network LADN supported by the second RAN device.
  • the capability information includes at least one of a data network name (DNN) of the LADN, a DNN index, an IP address or a prefix, and IP routing information.
  • DNN data network name
  • the first RAN device when the mobile device performs the mobile handover, the first RAN device sends a handover request to the second RAN device supporting the LADN according to the obtained capability information of the adjacent multiple RAN devices, so that the mobile terminal accesses the mobile terminal.
  • the RAN device can access the LADN service and improve the user experience.
  • the first RAN device may acquire capability information of the second RAN device by: sending, by the first RAN device, a connection establishment request message (eg, an Xn setup request message) to the second RAN device, and The second RAN device receives a connection setup response message.
  • the connection establishment response message includes capability information of the second RAN device.
  • the first RAN device completes the connection establishment with the second RAN device, and acquires the capability information of the second RAN device from the second RAN device.
  • the first RAN device can obtain capability information of other neighboring RANs through a connection establishment (e.g., Xn connection) process between the RAN devices.
  • a connection establishment e.g., Xn connection
  • the method further includes: the first RAN device determines that the terminal device accesses the LADN through the first session. Therefore, when the terminal device accesses a specific LADN through the first session, the first RAN device may send a handover request to the second RAN device that supports the specific LADN, so that after the mobile terminal accesses the second RAN device, the first The session will not be terminated or suspended, so that the service accessing the particular LADN will not be terminated or suspended, further enhancing the user experience.
  • the method further includes the first RAN device receiving an association between the session identifier of the first session and the first network name of the LADN from the session management function SMF network element.
  • the first RAN device receives the second network name from the SMF network element, and determines that the second network name corresponds to the LADN. Therefore, the first RAN device acquires the association between the session identifier of the first session and the network name (for example, the first network name or the second network name), and may select a handover for the terminal device when the terminal device performs the mobile handover according to the association. aims.
  • the application further discloses a communication method, the method comprising: the second RAN device acquiring capability information of the second RAN device from the AMF network element; and the second RAN device transmitting the second RAN device to the first RAN device Capability information.
  • the capability information is used to indicate a local data network LADN supported by the second RAN device.
  • the second RAN device sends the capability information of the second RAN device acquired from the AMF network element to the first RAN device.
  • the first RAN device may preferentially switch the terminal device to the RAN device supporting the LADN (for example, the second RAN device), so that the terminal device can access the LADN service after the handover. Thereby improving the user experience.
  • the second RAN device may acquire capability information by the second RAN device in establishing a connection process (eg, an N2 connection) between the second RAN and the AMF network element, from the AMF network element. Obtaining capability information of the second RAN device. Thereby, the second RAN device completes the connection establishment with the AMF network element, and acquires the capability information of the second RAN device from the AMF network element.
  • the capability information of the second RAN device can be used for the scenario of switching the terminal device, and is also applicable to other communication application scenarios.
  • the second RAN device may send the capability information of the second RAN device to the first RAN device by: the second RAN device receiving a connection establishment request message from the first RAN device (eg, an Xn setup request) The message sends a connection setup response message (Xn Setup Response message) to the first RAN device, where the connection setup response message includes capability information.
  • the first RAN device completes the connection establishment with the second RAN device, and acquires the capability information of the second RAN device from the second RAN device.
  • the present application also discloses a communication method, including: the AMF network element receives a connection establishment request message (for example, an NG setup request message) from the RAN device; and the AMF network element sends the capability information of the RAN device to the RAN device.
  • the capability information is used to indicate the LADN supported by the RAN device.
  • the AMF network element searches for the capability information of the RAN device, and then sends the capability information to the RAN device.
  • the AMF network element completes the connection establishment with the RAN device, and sends the capability information of the RAN device to the RAN device.
  • the capability information can be used to switch the terminal device.
  • the capability information can also be applied to other communication application scenarios.
  • the capability information of the RAN device includes at least one of a DNN of the first LADN, an IP address or a prefix, and IP routing information.
  • the capability information of the RAN device can represent the LADN supported by the RAN device.
  • the capability information of the RAN device further includes a correspondence between at least one of a DNN, an IP address or a prefix, and IP routing information of the first LADN and a cell identifier or a tracking area identifier.
  • the first RAN device may correspond to the tracking area identifier according to at least one of the DNN, the IP address or the prefix, and the IP routing information of the first LADN. Relationship, selecting a RAN device (eg, a second RAN device) that supports the first LADN as a handover target.
  • the first RAN device may perform a correspondence between the at least one of the DNN, the IP address or the prefix, and the IP routing information of the first LADN and the cell identifier, A cell supporting the first LADN under the RAN device (eg, the second RAN device) is selected as the target cell for handover.
  • the present application further discloses a communication method, including: an SMF network element receives a session identifier and a network name of a first session from a terminal device; and the SMF network element sends session management information to the RAN device.
  • the session management information includes an association between the session identifier and the network name.
  • the first RAN device preferentially selects the RAN device supporting the LADN as the handover target, so that the terminal device can access the LADN through the target RAN device, thereby improving the user experience.
  • the method further includes: the SMF network element determining that the terminal device accesses the local data network LADN through the first session. Therefore, when the terminal device accesses a specific LADN through the first session, the first RAN device may send a handover request to the second RAN device supporting the specific LADN, so that after the mobile terminal accesses the second RAN device, the first session It will not be terminated or suspended, so that the service accessing the specific LADN will not be terminated or suspended, further improving the user experience.
  • the method further includes: pre-configuring a network name corresponding to the LADN in the SMF network element; or, the SMF obtains a network name corresponding to the LADN from the AMF network element; or, the SMF network element is from the PCF network
  • the element obtains the network name corresponding to the LADN; or the SMF network element acquires the network name corresponding to the LADN from the data management network element.
  • the SMF network element can obtain the network name corresponding to the LADN.
  • an embodiment of the present application provides a radio access network device, where the radio access network device has a function of implementing a behavior of a radio access network device (eg, the first RAN device) in the foregoing method.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the structure of the radio access network device includes a processor and a transceiver, the processor being configured to process the radio access network device to perform a corresponding function in the above method.
  • the transceiver is configured to enable communication between a radio access network device and an access and mobility management function network element/other radio access network device (eg, a second RAN device).
  • the radio access network device can also include a memory for coupling with a processor that retains program instructions and data necessary for the radio access network device.
  • an embodiment of the present application provides a radio access network device, where the radio access network device has a function of implementing a behavior of a radio access network device (eg, the foregoing second RAN device) in the foregoing method.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the structure of the radio access network device includes a processor and a transceiver, the processor being configured to process the radio access network device to perform a corresponding function in the above method.
  • the transceiver is configured to enable communication between a radio access network device and an access and mobility management function network element/other radio access network device (e.g., a first RAN device).
  • the radio access network device can also include a memory for coupling with a processor that retains program instructions and data necessary for the radio access network device.
  • an embodiment of the present application provides a communication apparatus, which has a function of implementing AMF network element behavior in the foregoing method.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the structure of the communication device includes a processor and a transceiver configured to perform the corresponding functions of the above methods.
  • the transceiver is for enabling communication between the communication device and the terminal device/radio access network device (e.g., the first or second RAN device)/session management function network element.
  • the communication device can also include a memory for coupling with a processor that retains program instructions and data necessary for the communication device.
  • an embodiment of the present application provides a communication apparatus, which has a function of implementing an SMF network element behavior in the foregoing method.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the structure of the communication device includes a processor and a transceiver configured to perform the corresponding functions of the above methods.
  • the transceiver is for enabling communication between a communication device and a terminal device/radio access network device (e.g., first or second RAN device)/access and mobility management function network element.
  • the communication device can also include a memory for coupling with a processor that retains program instructions and data necessary for the communication device.
  • the embodiment of the present application provides a communication method, where the method includes: the terminal device discovers a network element from the access network (for example, an access network discovery and selection function network element in the 4G, or a PCF in the 5G) The network element receives the association between the access network identifier and the LADN; the terminal device accesses the access network corresponding to the access network identifier according to the association.
  • a network element for example, an access network discovery and selection function network element in the 4G, or a PCF in the 5G
  • the network element receives the association between the access network identifier and the LADN
  • the terminal device accesses the access network corresponding to the access network identifier according to the association.
  • the terminal device when the terminal device needs to reselect the non-3GPP access network, the terminal device associates with the identifier of the access network according to the association between the obtained access network identifier and the network name of the LADN.
  • the network access device sends a connection request. Since the access network device corresponding to the identifier of the foregoing access network supports the LADN, the terminal device can access the LADN service after accessing, thereby improving the user experience.
  • the method further includes: before the terminal device accesses the access network corresponding to the access network identifier according to the association between the access network identifier and the LADN, the terminal device determines that the terminal device accesses through the first session. LADN. Therefore, in the scenario of the non-3GPP access network, the terminal device learns the network name of the specific LADN through the first session by the terminal device, and according to the acquired identifier and LADN of the candidate access network that is available for access. The association between the network names can be accessed to the access network device supporting the specific LADN when the access network needs to be replaced. Therefore, the business of the specific LADN will not be terminated, which improves the user experience.
  • an embodiment of the present application provides a terminal device, where the terminal device has a function of implementing behavior of a terminal device in the foregoing method.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the structure of the terminal device includes a processor and a transceiver, the processor being configured to perform the corresponding function in the above method.
  • the transceiver is configured to implement communication between the terminal device and the radio access network device/access and mobility management function network element/access discovery network element.
  • the terminal device may also include a memory for coupling with the processor, which stores program instructions and data necessary for the terminal device.
  • embodiments of the present application provide a computer readable storage medium having instructions stored therein that, when run on a computer, cause the computer to perform the methods described in the above aspects.
  • embodiments of the present application provide a computer program product comprising instructions that, when run on a computer, cause the computer to perform the methods described in the various aspects above.
  • the present application provides a chip system including a processor for supporting the above-mentioned radio access network device or communication device or terminal device to implement the functions involved in the above aspects, for example, generating or processing the above The information involved in the method.
  • the chip system further includes a memory for holding program instructions and data necessary for the data transmitting device.
  • the chip system can be composed of chips, and can also include chips and other discrete devices.
  • FIG. 1 is a schematic diagram of a scenario in which a terminal device moves and switches in the prior art according to the present disclosure
  • FIG. 2 is a schematic diagram of a 5G communication system according to an embodiment of the present application.
  • FIG. 3 is a flowchart of a method for selecting a radio access network device according to an embodiment of the present application
  • FIG. 4 is a communication method according to an embodiment of the present application.
  • FIG. 5 is still another communication method according to an embodiment of the present application.
  • FIG. 6 is still another communication method according to an embodiment of the present application.
  • FIG. 7 is a handover method according to an embodiment of the present application.
  • FIG. 8 is still another communication method according to an embodiment of the present application.
  • FIG. 9 is a specific flowchart of selecting a radio access network device according to an embodiment of the present application.
  • FIGS. 10A and 10B are schematic diagrams showing the structure of a radio access network device according to an embodiment of the present invention.
  • FIG. 11A and 11B are schematic structural diagrams of still another radio access network device according to an embodiment of the present invention.
  • 12A and 12B are schematic diagrams showing the structure of a communication device according to an embodiment of the present invention.
  • FIGS. 13A and 13B are schematic diagrams showing the structure of still another communication device according to an embodiment of the present invention.
  • 14A and 14B are schematic diagrams showing the structure of a terminal device according to an embodiment of the present invention.
  • the network architecture and the service scenario described in this application are for the purpose of more clearly explaining the technical solutions of the present application, and do not constitute a limitation of the technical solutions provided by the present application.
  • Those skilled in the art may know that with the evolution of the network architecture and new business scenarios, The technical solution provided by the present application is equally applicable to similar technical problems.
  • plural means two or more.
  • “and/or” describing the association relationship of the associated objects, indicating that there may be three relationships, for example, A and/or B, which may indicate that there are three cases where A exists separately, A and B exist at the same time, and B exists separately.
  • the character "/” generally indicates that the contextual object is an "or" relationship.
  • FIG. 2 is a schematic diagram of a 5G communication system that may be tried in an embodiment of the present application.
  • the control plane function and the forwarding plane function of the mobile gateway are decoupled, and the separated control plane functions and the third generation partnership project (3GPP) traditional control network element mobility management
  • 3GPP third generation partnership project
  • MME mobility management entity
  • the user plane function (UPF) network element can implement user plane functions (SGW-U and PGW-U) of a serving gateway (SGW) and a packet data network gateway (PGW).
  • SGW-U and PGW-U user plane functions
  • SGW serving gateway
  • PGW packet data network gateway
  • the unified control plane network element can be decomposed into an access and mobility management function (AMF) network element and a session management function (SMF) network element.
  • AMF access and mobility management function
  • SMF session management function
  • the embodiments of the present application can also be applied to other communication technologies for the future.
  • the system architecture and the service scenario described in the embodiments of the present application are for the purpose of more clearly illustrating the technical solutions of the embodiments of the present application, and do not constitute a limitation of the technical solutions provided by the embodiments of the present application.
  • the technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.
  • the embodiment of the present application provides a communication system.
  • the communication system includes at least a terminal device 201, a RAN device 202, an AMF network element 205, an SMF network element 206, and a UPF network element 203.
  • the terminal device 201 involved in the system may be a terminal device supporting the LADN network.
  • the user equipment to which the present invention can be applied is not limited to the 5G network, and can also be applied to all kinds of terminal devices, including: mobile phones, Internet of things devices, smart home devices, industrial control devices, vehicle devices, and the like.
  • the technical solutions provided by the embodiments of the present invention can be used as long as the requirements of the LADN network and the terminal devices having the above technical problems are available.
  • the terminal device may also be referred to as a user equipment (UE) mobile station (Mobile Station), a mobile station (Mobile), a remote station (Remote Station), a remote terminal (Remote Terminal), and an access terminal (Access Terminal).
  • UE user equipment
  • the user terminal (User Terminal), the user agent (User Agent), and the user device (User Device or User Equipment) are not limited herein.
  • the terminal device may also be a vehicle in a communication between a vehicle and a vehicle in a vehicle-to-vehicle (V2V) communication.
  • V2V vehicle-to-vehicle
  • the RAN device 202 involved in the system is a device for providing a wireless communication function for the terminal device 201, and the RAN device may include various forms of base stations, such as a macro base station and a micro base station (also referred to as small Station), relay station, access point, etc.
  • base stations such as a macro base station and a micro base station (also referred to as small Station), relay station, access point, etc.
  • the name of a device having a base station function may be different, for example, in an LTE system, an evolved Node B (evolved NodeB, eNB or eNodeB), in the third In a 3rd generation (3G) system, it is called a Node B or the like.
  • gNB gNodeB
  • the UPF network element 203 can implement user plane functions (SGW-U and PGW-U) of the SGW and the PGW.
  • the UPF network element can be connected to the same or different data network (DN) to implement data transmission of the service.
  • DN data network
  • the UPF network element may also be referred to as a UPF device or a UPF entity.
  • the AMF network element 205 may be responsible for attachment, mobility management, tracking area update process, and the like of the terminal device.
  • AMF network elements can also be referred to as AMF devices or AMF entities.
  • the above SMF network element 206 can be responsible for session management of the terminal device.
  • session management includes selection of user plane devices, reselection of user plane devices, internet protocol (IP) address allocation, quality of service (QoS) control, and establishment, modification, or release of sessions.
  • IP internet protocol
  • QoS quality of service
  • the SMF network element may also be referred to as an SMF device or an SMF entity.
  • the communication system further includes a policy control function (PCF) network element 207.
  • the PCF network element 207 includes policy control and flow rate based control based functions.
  • the PCF network element 207 can implement a user subscription data management function, a policy control function, a charging policy control function, a QoS control, and the like.
  • a PCF network element may also be referred to as a PCF entity or a PCF device.
  • the communication system further includes a data management device, such as a unified data management (UDM) device 208.
  • the UDM device 208 is configured to store subscription data of the user, for example, mobility management related subscription data and session management related subscription data.
  • a UDM device may also be referred to as a UDM entity or a UDM network element.
  • FIG. 3 is a flowchart of a method for selecting a radio access network device according to an embodiment of the present application.
  • the method can be used in a scenario where a terminal device switches a RAN device under a 3GPP access network.
  • the method is performed by a first RAN device.
  • the first RAN device is the RAN device 201 in FIG.
  • the method may include:
  • the first RAN device acquires capability information of the second RAN device.
  • the capability information of the second RAN device is used to indicate the LADN supported by the second RAN device.
  • the capability information includes at least one of a data network name (DNN) of the LADN, a DNN index, an IP address or a prefix, and IP routing information. That is, when the capability information of the second RAN device includes at least one of a DNN of the LADN, a DNN index, an IP address or a prefix, and IP routing information, the second RAN device is a RAN device supporting the LADN.
  • DNN data network name
  • the capability information of the second RAN device may include a DNN, a DNN index, an IP address, or Correspondence between at least one of the prefix and IP routing information and the tracking area identifier.
  • the capability information of the second RAN device may include the LADN.
  • the DNN the DNN index, the IP address or prefix, and the IP routing information and the cell identifier.
  • the first RAN device may acquire capability information of multiple RAN devices adjacent to the first RAN device.
  • the capability information obtained to each RAN device includes at least capability information of the second RAN device.
  • the first RAN device may also acquire capability information of other LADN-capable RAN devices.
  • the neighboring RAN device when the neighboring RAN device does not feed back the capability information to the first RAN device, the neighboring RAN device may be considered as not supporting the LADN.
  • the first RAN device sends a handover request message to the second RAN device.
  • the first RAN device After acquiring the capability information of the second RAN device, the first RAN device learns that the second RAN device is a RAN device supporting the LADN. After the first RAN device determines that the terminal device performs the handover, the first RAN device may select the second RAN device as the target of the handover according to the capability information of the second RAN device, and send a handover request message to the second RAN device.
  • the first RAN device selects a cell supporting the LADN under the second RAN device as the target cell of the handover according to the cell identifier in the capability information, and Sending a handover request to the target cell.
  • Step S303 will be further described in conjunction with FIG.
  • the first RAN device ie, the source RAN device
  • the first RAN device may send the second RAN supporting the LADN according to the obtained capability information of the adjacent multiple RAN devices.
  • the device sends a handover request, so that the mobile terminal can access the LADN service after accessing the second RAN device, thereby improving the user experience.
  • the present invention can be applied to a scenario in which the terminal device does not access the LADN before the handover, and can also be applied to the scenario in which the terminal device accesses the LADN before the handover.
  • the first RAN device may perform the following S302.
  • the first RAN device determines that the terminal device accesses the LADN by using the first session.
  • the terminal device accesses a particular LADN through the first session.
  • the specific LADN is LADN1 and the network name of LADN1 is DNN1.
  • the first RAN device makes a handover decision, it is determined that the terminal device accesses LADN1 through the first session. For example, since the first RAN device stores the association of the identifier of the first session with the DNN1 of LADN1, the first RAN device can determine that the terminal device previously accesses LADN1 through the first session.
  • the first RAN device may select a handover target according to the DNN1 and the acquired capability information of each RAN device.
  • the capability information of the second RAN device includes DNN1, thereby indicating that the second RAN device supports LADN1 corresponding to DNN1.
  • the first RAN device selects the second RAN device that can also support LADN1 as the handover target, and sends a handover request message to the second RAN device. If the acquired capability information of each RAN device does not include DNN1, the first RAN device may select a handover target RAN device from the candidate RAN devices by referring to the prior art.
  • the first RAN device may send a handover request to the second RAN device supporting the specific LADN, so that the mobile terminal accesses the second RAN device.
  • the first session will not be terminated or suspended, so that the service accessing the specific LADN will not be terminated or suspended, further improving the user experience.
  • the method further includes any one of the following two implementation manners to obtain an association between the identifier of the first session and the network name of the LADN.
  • the first RAN device receives an association between the session identifier of the first session and the network name of the LADN from the SMF network element (eg, SMF network element 206 in FIG. 2).
  • the association between the session identifier of the first session and the network name of the LADN may be determined by the SMF network element; or the SMF network element is from the AMF network element (eg, AMF network element 205 in FIG. 2)
  • an association between the session identifier of the first session and the network name of the LADN is obtained in a PCF network element (eg, PCF network element 207 in FIG. 2).
  • the first RAN device receives, from the SMF network element, a network name corresponding to the first session. In this manner, the association between the session identity of the first session and the network name of the LADN is determined by the first RAN device.
  • the first RAN device may further save an association between the session identifier of the first session and the network name of the LADN.
  • FIG. 4 is a communication method provided in an embodiment of the present application. As shown in FIG. 4, the method may include:
  • the second RAN device sends a connection establishment request message to the AMF network element.
  • the AMF network element receives a connection setup request message from the second RAN device.
  • connection setup request message is used to request to establish a device connection between the second RAN device and the AMF network element, which may occur when the device is powered on.
  • the connection between the second RAN device and the AMF may be an N2 connection.
  • the connection establishment request message may be an NG setup request message.
  • connection setup response message After receiving the connection establishment request message, the AMF network element sends a connection establishment response message to the second RAN device.
  • the second RAN device receives a connection setup response message from the AMF network element.
  • the foregoing connection setup response message includes the capability message of the second RAN device.
  • the capability information is used to indicate the LADN supported by the second RAN device.
  • connection setup response message may be an NG setup response message.
  • the AMF network element After receiving the connection establishment request message, the AMF network element searches for capability information of the second RAN device.
  • the manner in which the foregoing AMF network element obtains the capability message of the second RAN device includes any one of the following:
  • the capability information of each RAN device (including the capability information of the second RAN device) is configured in advance on the AMF network element.
  • the AMF network element is configured with capability information of the AMF (ie, the LADN supported by the AMF device and the SA corresponding to the LADN).
  • the RAN device can report the location information to the AMF device.
  • the AMF device determines the LADN supported by the RAN device according to the location information reported by the RAN device and the SA distribution of the LADN, that is, the capability information of the RAN device is determined.
  • connection establishment request message carries the location information of the second RAN device
  • the AMF network element determines the LADN supported by the second RAN device, and sets the capability information of the second RAN device by using the connection establishment response message. Send to the second RAN device.
  • the AMF network element obtains each of the PCF network elements (for example, the PCF network element 207 in FIG. 2) in the process of establishing a connection (for example, an N15 connection) between the AMF network element and the PCF network element.
  • Capability information of the RAN device including capability information of the second RAN device.
  • the AMF network element may obtain the capability message of the second RAN device in other manners, which is not limited in this application.
  • the above steps S401 and S402 can be performed when the second RAN device is powered on.
  • the second RAN device completes the connection establishment with the AMF network element, and acquires the capability information of the second RAN device from the AMF network element.
  • the capability information of the second RAN device can be used for the scenario of the handover of the terminal device, and is also applicable to other communication application scenarios, and the invention is not limited thereto.
  • S403 after receiving the connection establishment response message from the AMF network element, the second RAN device saves the capability message of the second RAN device.
  • the capability information may be sent to the first RAN device.
  • the specific process is:
  • the first RAN device sends a connection establishment request message to the second RAN device.
  • the second RAN device receives a connection setup request message from the first RAN device.
  • the connection setup request message is used to request to establish a device connection between the first RAN device and the second RAN device, which may occur during device power-on.
  • the connection of the first RAN device and the second RAN device may be an Xn connection.
  • the connection establishment request message may be an Xn setup request message.
  • connection establishment response message After receiving the foregoing connection establishment request message sent by the first RAN device, the second RAN device sends a connection establishment response message to the first RAN device.
  • the first RAN device receives a connection setup response message from the second RAN device.
  • the connection establishment response message includes the capability information of the second RAN device obtained by the second RAN device.
  • the connection setup response message may be an Xn setup response message.
  • the first RAN device After receiving the connection establishment response message from the second RAN device, the first RAN device saves an association between the capability message of the second RAN device and the identity information of the second RAN device.
  • the identifier information of the second RAN device is used to indicate the second RAN device.
  • the first RAN device completes the connection establishment with the second RAN device, and acquires the capability information of the second RAN device from the second RAN device. Similarly, the first RAN device can obtain capability information of other neighboring RANs through a connection establishment process between the RAN devices.
  • the method is not limited to the application scenario of the embodiment of the present application, and is applicable to other communication application scenarios.
  • the second RAN device acquires capability information of the second RAN device from the AMF network element, and sends the capability information to the first RAN device.
  • the terminal device can be preferentially switched to the RAN device supporting the LADN (for example, the second RAN device) when the handover target is selected for the terminal device, so that the terminal device can access the LADN service after the handover. , thus improving the user experience.
  • the first RAN device may also obtain capability information of the first RAN device in a manner similar to S401 and S402.
  • the connection establishment request message sent by the first RAN device to the second RAN device in step S404 may further carry the capability information of the first RAN device.
  • each capability information can be notified to each other, that is, the network name of the LADN supported by each is notified.
  • FIG. 5 and FIG. 6 are respectively another communication method provided in the embodiment of the present application.
  • the method of Figure 5 or Figure 6 can be performed in a setup process of a session (e.g., a first session).
  • a session e.g., a first session.
  • the association between the session identifier of the first session and the network name of the LADN is determined by the SMF network element.
  • the association between the session identity of the first session and the network name of the LADN is determined by the first RAN device.
  • the method may include:
  • the terminal device sends a session establishment request message to the AMF network element by using the first RAN device.
  • the AMF network element receives a session establishment request message from the first RAN device.
  • the session establishment request message is used to request to establish a first session.
  • the terminal device sends a non-access stratum (NAS) message to the AMF network element, where the NAS message includes a session ID (session ID) of the first session, a network name, and session management (SM). Information (for example, N1SM information).
  • the session management information includes the session establishment request message.
  • the network name includes at least one of a DNN, a DNN index, an IP address or a prefix, and IP routing information.
  • the AMF network element After receiving the session establishment request message, the AMF network element selects an SMF network element, and sends the session identifier, the network name, and the session management information of the first session to the SMF network element.
  • the SMF network element After receiving the session identifier, the network name, and the session management information of the first session, the SMF network element selects a UPF network element, and sends a user plane connection establishment request message to the UPF network element to establish an SMF network element and a UPF. Connections between network elements (for example, N4 connections).
  • the UPF network element receives the user plane connection establishment request message from the SMF network element.
  • the user plane connection establishment request message may be an N4 session establishment request message.
  • the UPF network element After receiving the user plane connection establishment request message, the UPF network element sends a user plane connection establishment response message to the SMF network element.
  • the SMF network element receives the user plane connection setup response message from the UPF network element.
  • the user plane connection setup response message may be an N4 session setup response message.
  • S505 The foregoing SMF network element learns that the terminal device accesses the LADN through the first session.
  • the SMF network element can obtain the terminal device to access the LADN through the first session by using any of the following methods:
  • the first type the SMF network element determines that the terminal device accesses the LADN through the first session.
  • the SMF network element determines whether the terminal device accesses the LADN through the first session according to the network name carried in step S502 and the network name corresponding to the obtained LADN. For example, if the network name corresponding to the acquired LADN includes the network name carried in step S502, the SMF network element determines that the terminal device accesses the LADN through the first session.
  • the SMF network element can obtain the network name corresponding to the LADN by any of the following methods:
  • the SMF network element obtains the network name corresponding to the LADN from the AMF network element
  • the SMF network element obtains the network name corresponding to the LADN from the PCF network element;
  • the SMF network element acquires the network name corresponding to the LADN from the data management device (for example, the UDM device 208 in FIG. 2).
  • the SMF network element may also obtain the network name corresponding to the LADN in other manners, which is not limited in this application.
  • the SMF network element learns from the AMF network element that the terminal device accesses the LADN through the first session.
  • the network name corresponding to the LADN is pre-configured in the AMF network element.
  • the AMF network element can determine whether the terminal device accesses the LADN through the first session according to the network name carried in step S501 and the network name corresponding to the pre-configured LADN. For example, if the network name corresponding to the pre-configured LADN includes the network name carried in step S501, the AMF network element determines that the terminal device accesses the LADN through the first session.
  • the AMF network element may send, to the SMF network element, indication information indicating that the terminal device accesses the LADN through the first session, so that the SMF network element learns, according to the indication information, that the terminal device accesses the LADN through the first session.
  • the SMF network element learns from the PCF network element that the terminal device accesses the LADN through the first session.
  • the SMF network element sends the network name carried in step S502 to the PCF network element.
  • the PCF network element determines whether the terminal device accesses the LADN through the first session according to the network name sent by the SMF network element and the network name corresponding to the obtained LADN. For example, if the network name corresponding to the acquired LADN includes the network name sent by the SMF network element, the PCF network element determines that the terminal device accesses the LADN through the first session.
  • the PCF network element may send, to the SMF network element, indication information indicating that the terminal device accesses the LADN through the first session, so that the SMF network element learns, according to the indication information, that the terminal device accesses the LADN through the first session.
  • the PCF network element can obtain the network name corresponding to the LADN by any of the following methods:
  • the PCF network element obtains the network name corresponding to the LADN from the AMF network element.
  • the PCF network element acquires the network name corresponding to the LADN from the UDM network element.
  • the SMF network element can know that the terminal device accesses the LADN through the first session.
  • the SMF network element saves an association between the session identifier of the first session and the network name of the LADN. For example, if the session identifier of the first session is session ID 1, and the network name of the LADN is DNN1, the SMF network element stores the association between session ID 1 and DNN1, as shown in Table 1.
  • Session identifier Network name Session ID 1 DNN 1
  • the SMF network element saves the association between the multiple sets of session identifiers and the network name.
  • step S505 does not limit the execution time of step S505. As long as the SMF obtains the network name through S502, step S505 may be performed.
  • the SMF network element learns that after the terminal device accesses the LADN through the first session, the terminal device sends an association between the session identifier of the first session and the network name of the LADN to the AMF network element.
  • the SMF network element sends the SM information to the AMF network element, for example, N2 SM information.
  • the N2 SM information includes an association between the session identifier and the first network name of the LADN.
  • the SMF network element determines, by step S505, that the data network accessed by the terminal device through the first session is not the LADN, the association between the session identifier and the network name does not need to be sent to the AMF network element/the first RAN device.
  • the AMF network element After receiving the association between the session identifier of the first session and the first network name of the LADN, the AMF network element forwards the session request message to the first RAN device.
  • the above session request message includes an association between the session identifier of the first session and the first network name of the LADN.
  • the first RAN device receives a session request message from the AMF network element.
  • the above session request message may be an N2 session request message.
  • the association between the session identifier of the first session and the network name of the LADN is saved. This association is used to select a handover target for the terminal device when the terminal device moves.
  • the first RAN device receives the association between the session identifier of the first session and the network name of the LADN from the SMF network element.
  • the subsequent steps of the session establishment process may be performed by referring to the prior art, and details are not described herein again.
  • FIG. 6 is still another communication method provided in the embodiment of the present application.
  • the SMF network element is shown in Figure 6.
  • the method includes:
  • the terminal device sends a session establishment request message to the AMF network element by using the first RAN device.
  • the AMF network element receives a session establishment request message from the first RAN device.
  • the session establishment request message is used to request to establish a first session.
  • the AMF network element After receiving the session establishment request message, the AMF network element selects an SMF network element, and sends the session identifier, the network name, and the session management information of the first session to the SMF network element.
  • the SMF network element After receiving the session identifier, the network name, and the session management information of the first session, the SMF network element selects a UPF network element, and sends a user plane connection establishment request message to the UPF network element to establish an SMF network element and a UPF. The connection between network elements.
  • the UPF network element receives the user plane connection establishment request message from the SMF network element.
  • the UPF network element After receiving the user plane connection establishment request message, the UPF network element sends a user plane connection establishment response message to the SMF network element. Correspondingly, the SMF network element receives the user plane connection setup response message from the UPF network element.
  • Steps S601 to S604 are the same as steps S501 to S504 in FIG. 5, and details are not described herein again.
  • the SMF network element After receiving the session establishment response message, the SMF network element sends the session identifier and the network name of the first session carried in step S602 to the AMF network element.
  • the SMF network element sends the SM information to the AMF network element, for example, N2 SM information.
  • the N2 SM information includes the foregoing session identifier and network name.
  • Step S605 is different from step S506 in FIG. 5 in that, in the example of FIG. 5, the SMF network element learns that the terminal device accesses the LADN through the first session, and then the session identifier and the network name of the LADN are The association is sent to the first RAN device.
  • the SMF network element learns that the terminal device accesses the LADN through the first session, and then the session identifier and the network name of the LADN are The association is sent to the first RAN device.
  • the SMF network element does not determine whether the terminal device accesses the LADN through the first session, and the SMF network element can directly send the received session identifier and network name to the first RAN device, and then The first RAN device determines if the network name corresponds to the LADN.
  • the AMF network element After receiving the session identifier and the network name, the AMF network element sends a session request message to the first RAN device.
  • the above session request message includes the above session identifier and network name.
  • the above session request message may be an N2 session request message.
  • the first RAN device After receiving the foregoing session request message, the first RAN device determines that the terminal device accesses the LADN through the first session.
  • the first RAN device acquires capability information of the first RAN device in a manner similar to steps S401 and S402, so as to know the network name corresponding to the LADN.
  • the first RAN device determines, according to the session identifier and the network name of the first session acquired in step S606, whether the terminal device accesses the LADN through the first session. For example, if the network name corresponding to the acquired LADN includes the network name carried in step S606, the first RAN device determines that the terminal device accesses the LADN through the first session.
  • the first RAN device determines that the terminal device saves the association between the session identifier of the first session and the network name of the LADN after accessing the LADN through the first session. This association is used to select a handover target for the terminal device when the terminal device moves.
  • the first RAN device determines the association between the session identifier of the first session and the network name of the LADN from the SMF network element.
  • the subsequent steps of the session establishment process may be performed by referring to the prior art, and details are not described herein again.
  • FIG. 7 is a handover method provided in an embodiment of the present application. As shown in FIG. 7, the method may include:
  • the first RAN device sends measurement control information to the terminal device, where the measurement report of the terminal device is obtained.
  • the measurement control information may include at least one of an object to be measured, a cell list, and a reporting manner.
  • the terminal device performs measurement according to the received measurement control information, and then sends the measurement report to the first RAN device.
  • the above measurement report includes cell identifiers within the coverage of each RAN device in the candidate RAN device and the candidate RAN device.
  • the candidate RAN device is a RAN device that the terminal device can access.
  • the number of candidate RAN devices is not limited in this application, and at least one of the candidate RAN devices supports the LADN service.
  • S703 The first RAN device makes a handover decision according to the received measurement report.
  • the first RAN device After the first RAN device decides to perform the handover for the terminal device according to the measurement report, the first RAN device searches for the presence of the candidate RAN device according to the capability information of the other RAN devices acquired during the process of establishing a connection with the other RAN device.
  • a RAN device supporting LADN (such as the second RAN device described above). Thereby, the first RAN device selects the second RAN device as the handover target. Therefore, the mobile terminal can access the LADN service after accessing the second RAN device, thereby improving the user experience.
  • the first RAN device first determines that the terminal device accesses the LADN through the first session. For example, the first RAN device may determine that the terminal device accesses the LADN through the first session according to the association between the first session session identifier acquired by the process of FIG. 5 or FIG. 6 and the network name of the LADN. The first RAN device determines whether the RAN device (for example, the second RAN device described above) that includes the network name in the capability information exists in the candidate RAN device. The first RAN device may acquire capability information of each RAN device by performing steps S401 to S406.
  • the first RAN device selects the RAN device as the handover target. Therefore, after the mobile terminal accesses the second RAN device, the service accessing the specific LADN is not terminated or suspended, further improving the user experience.
  • the first RAN device selects a cell supporting the LADN under the RAN device as the target cell of the handover.
  • the handover target may be selected from the candidate RAN devices by referring to the prior art.
  • the capability information of the candidate RAN device saved in the first RAN device may be as shown in Table 2 below.
  • the candidate RAN devices include RAN 1, RAN 2, RAN 3, and RAN 4.
  • the identifiers of RAN 1, RAN 2, RAN 3, and RAN 4 are ID 1, ID 2, ID 3, and ID 4, respectively.
  • the capability information of the four candidate RAN devices is saved in the first RAN device, and the capability information is taken as an example of the DNN.
  • the capability information of RAN 1 includes DNN1, indicating that RAN 1 supports LADN 1 corresponding to DNN1.
  • the capability information of the RAN 2 includes the cell identifiers of the DNN 2 and the cell 1, indicating that the LADN 2 is granular to the cell, and the cell cell 1 under the RAN 2 supports the LADN corresponding to the DNN 2.
  • the capability information of the RAN 3 includes DNN2 and DNN3, and the identifier RAN 3 supports LADN 2 corresponding to DNN2 and LADN 3 corresponding to DNN3, respectively. Furthermore, since there is no capability information of the RAN 4 in the first RAN device, it can be considered that the RAN 4 does not support the LADN.
  • the network name corresponding to the first session of the terminal device is DNN 1.
  • the first RAN device selects the capability information including the RAN 1 of the DNN 1 as the target of the handover according to the acquired capability information.
  • the first RAN device selects one RAN device from the RAN 2 and the RAN 3 whose capability information includes the DNN 2 as the target of the handover. Further, when the first RAN device selects the RAN 2 as the target of the handover, the cell 1 should also be selected as the target cell of the handover.
  • the network name corresponding to the first session of the terminal device is DNN 4.
  • the mobile device performs mobile handover, there is no RAN device in the candidate RAN device whose capability information includes the DNN 4.
  • the first RAN device preference capability information includes the RAN 3 of the DNN 2 and the DNN 3 as the target of the handover. In this way, after the mobile device switches, it can ensure that the DDN2 corresponds to LADN 2 or LADN 3 corresponding to DNN2, thereby improving the user experience.
  • the first RAN device may select a handover target by referring to the scenario in which the network name corresponding to the first session is LADN 4, and details are not described herein again.
  • the first RAN device sends a handover request to the target RAN (for example, the second RAN device).
  • the target RAN device After receiving the foregoing handover request, the target RAN device performs handover processing such as parameter checking and resource reservation. After the processing is successful, the target RAN device will send a handover response message to the first RAN device.
  • handover processing such as parameter checking and resource reservation.
  • FIG. 8 is still another communication method provided in the embodiment of the present application.
  • Figure 8 will be described in conjunction with Figures 5 and 6.
  • the method may include:
  • the SMF network element receives the session identifier and the network name of the first session from the terminal device.
  • the SMF can obtain the session identifier and the network name of the first session by using the step S502 in FIG. 6 or the step S602 in FIG. 6 , and details are not described herein again.
  • the SMF network element After receiving the session identifier and the network name of the first session, the SMF network element sends session management information to the first RAN device.
  • the session management information includes an association between the session identifier of the first session and a network name.
  • step S803 reference may be made to the description of step S506 in FIG. 5 or S605 in FIG. 6, and details are not described herein again.
  • the first RAN device preferentially selects the RAN device supporting the LADN as the handover target, so that the terminal device can access the LADN through the target RAN device, thereby improving the user experience.
  • the method may further include:
  • the SMF network element After receiving the session identifier and the network name of the first session, the SMF network element determines that the terminal device accesses the local data network LADN through the first session.
  • the first RAN device acquires the association between the session identifier of the first session and the network name.
  • the first RAN device determines, according to the association, whether the terminal device has a session for accessing the LADN.
  • the first RAN device selects the RAN device supporting the LADN as the handover target.
  • the present application also provides yet another method of selecting a wireless access network device. This method can be applied to scenarios of non-3GPP access networks. As shown in FIG. 9, the method may include:
  • the access discovery network element sends the access network information to the terminal device.
  • the terminal device receives the access network information from the access discovery network element.
  • the access network information includes an association between the identity of the access network and the network name of the LADN.
  • the access discovery network element may be an Access Network Discovery and Selection Function (ANDSF) network element in the fourth generation mobile communication system (4G), or may be a fifth generation mobile A PCF network element (for example, the PCF network element 207 in FIG. 2) in the communication system (5G), or a network element capable of providing access network information to the terminal device in the future communication system, which is not limited herein.
  • the number of access discovery network elements may be one or more. The number of access discovery network elements is not limited in this application.
  • the identifier of the access network described above can be used to identify different access networks.
  • the identifier of the access network may be a Service Set Identifier (SSID).
  • SSID Service Set Identifier
  • the foregoing access network information further includes an access technology type of the access network.
  • the access technology types include a Wireless Local Area Network (WLAN), or a Worldwide Interoperability for Microwave Access (WiMAX).
  • the terminal device After receiving the foregoing access network information, the terminal device acquires an association between the identifier of the access network and the network name of the LADN.
  • the access discovery network element in this application may be one or more.
  • the terminal device can acquire an association between one or more sets of access network identifiers and a network name of the LADN. For example, in an implementation manner, the terminal device may acquire an association between the identifiers of the multiple groups of access networks and the network names of the LADNs from an access discovery network element. In another implementation manner, the terminal device may acquire associations between the identifiers of the multiple groups of access networks and the network names of the LADNs from multiple access discovery network elements. For example, the association between the network identifier of the access acquired by the terminal device and the network name of the LADN may be as shown in Table 3 below.
  • the terminal device acquires an association between the identifiers of the two groups of access networks and the network names of the LADNs.
  • the example in which the access network identifier is the SSID is taken as an example.
  • the identifiers of access network 1 and access network 2 are: SSID1 and SSID2, respectively.
  • the network names of LADN1, LADN 2, and LADN 3 are DNN 1, DNN 2, and DNN3, respectively.
  • the association between the identifier of the access network and the network name of the LADN in Table 3 indicates that the access network 1 corresponding to SSID 1 supports LADN 1; the access network 2 corresponding to SSID 2 supports LADN 2 and LADN 3.
  • the terminal device accesses the access network device corresponding to the identifier of the access network according to the association between the access network identifier and the network name of the LADN in the foregoing S902.
  • the terminal device when the terminal device needs to reselect the non-3GPP access network, the terminal device responds to the identifier of the access network according to the association between the obtained access network identifier and the network name of the LADN.
  • the access network device sends an access request. Since the access network device corresponding to the identifier of the access network supports the LADN, the terminal device can access the LADN service after replacing the access network, thereby improving the user experience.
  • the embodiment of the present invention is applicable to a scenario in which the terminal device does not access the LADN before the terminal device replaces the access network, and is also applicable to the scenario in which the terminal device accesses the LADN before the terminal device replaces the access network.
  • step S903 is performed in the terminal device.
  • S903 The terminal device learns that the terminal device accesses the LADN through the first session.
  • the SMF network element learns that the terminal device accesses the LADN through the first session, and may refer to steps S501 to S505. Then, the SMF network element sends the indication information for instructing the terminal device to access the LADN through the first session to the terminal device through the AMF network element and the RAN device.
  • the SMF network element determines, by step S505, that the data network accessed by the terminal device through the first session is not the LADN, the network name does not need to be sent to the terminal device.
  • the terminal device may determine the LADN of the first session access. For example, in the registration process, the terminal device acquires the network name corresponding to the LADN from the AMF device, and then matches the network name corresponding to the LADN with the network name of the LADN corresponding to the first session.
  • the terminal device determines that the first session access LADN.
  • step S904 when the terminal device accesses a specific LADN through the first session, the terminal device can access the LADN through the first session according to the learned terminal device, and the access network identifier obtained by the terminal device and the network name of the LADN.
  • the terminal device learns in step S903 that the network name of the LADN accessed by the terminal device through the first session is DNN1, and the terminal device acquires the association between the identifiers SSID 1 and DNN 1 in step S902, and DNN 1 corresponds to LADN 1 . Then, the terminal device selects and accesses the access network device that supports LADN 1 and is identified as SSID 1.
  • the terminal device learns the network name of the specific LADN through the first session by the terminal device, and according to the obtained identifier of the candidate access network that is available for access.
  • the association with the network name of the LADN can be accessed to an access network device supporting the particular LADN. Therefore, after the terminal device accesses the access network, the service of the specific LADN is not terminated, thereby improving the user experience.
  • various methods such as a method for selecting a radio access network device provided by the embodiment of the present application, are introduced from the perspective of the interaction between the network elements and the network elements.
  • each network element such as the above-mentioned radio access network device or communication device or terminal device, etc., in order to implement the above functions, includes hardware structures and/or software modules corresponding to each function.
  • the present application can be implemented in a combination of hardware or hardware and computer software in combination with the elements and algorithm steps of the various examples described in the embodiments disclosed herein. Whether a function is implemented in hardware or computer software to drive hardware depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present application.
  • the radio access network device may include a receiving module 1001 and a transmitting module 1003, as shown in FIG. 10A.
  • the radio access network device further includes a processing module 1002.
  • the radio access network device can be used to perform the operations of the first RAN device of Figures 3 through 8 above.
  • the receiving module 1001 is configured to receive, by the second RAN device, capability information of the second RAN device, where the capability information is used to indicate a local data network LADN supported by the RAN device.
  • the sending module 1003 is configured to send a handover request message to the second RAN device.
  • the radio access network device sends a handover request to the second RAN device supporting the LADN according to the obtained capability information of the neighboring multiple RAN devices, so that the mobile terminal accesses
  • the second RAN device can access the LADN service and improve the user experience.
  • the sending module 1003 is configured to send a connection setup request message to the second RAN device, where the receiving module is configured to receive a connection setup response message from the second RAN device, where the connection setup response message includes the second RAN device.
  • Ability information is configured to send a connection setup request message to the second RAN device, where the receiving module is configured to receive a connection setup response message from the second RAN device, where the connection setup response message includes the second RAN device.
  • the processing module 1002 is configured to determine that the terminal device accesses the LADN through the first session.
  • the receiving module 1001 is further configured to receive, by the session management function SMF network element, an association between the session identifier of the first session and the first network name of the LADN; or the receiving module 1001 is further configured to use the SMF network element.
  • the processing module 1002 is further configured to determine that the second network name corresponds to the LADN.
  • the first RAN device may send a handover request to the second RAN device that supports the specific LADN, so that after the mobile terminal accesses the second RAN device, the first The session will not be terminated or suspended, so that the service accessing the particular LADN will not be terminated or suspended, further enhancing the user experience.
  • the receiving module 1001, the processing module 1002, and the sending module 1003 in the radio access network device may further implement other operations or functions of the first RAN device in the foregoing method, and details are not described herein again.
  • FIG. 10B is a schematic diagram showing another possible structure of the radio access network device involved in the foregoing embodiment.
  • the radio access network device includes a transceiver 1004 and a processor 1005 as shown in FIG. 10B.
  • the processor 1005 is configured to perform, by the radio access network device, a corresponding function of the first RAN device in the above method.
  • the transceiver 1004 is configured to implement communication between the first RAN device and the access and mobility management function network element/other radio access network device (eg, the second RAN device).
  • the radio access network device can also include a memory 1006 for coupling with a processor that retains program instructions and data necessary for the radio access network device.
  • the radio access network device may include a receiving module 1101 and a transmitting module 1103, as shown in FIG. 11A.
  • the radio access network device further includes a processing module 1102.
  • the radio access network device can be used to perform the operations of the second RAN device of Figures 3, 4 and 7 above. E.g:
  • the receiving module 1101 is configured to receive capability information of the radio access network device from an AMF network element, where the capability information is used to indicate a local data network LADN supported by the radio access network device.
  • the sending module 1103 is configured to send capability information to the first RAN device.
  • the radio access network device sends the capability information of the radio access network device acquired from the AMF network element to the first RAN device.
  • the first RAN device may preferentially switch the terminal device to the RAN device supporting the LADN (for example, the second radio access network device) when the handover target is selected for the terminal device, so that the terminal device after the handover
  • the ability to access LADN services increases the user experience.
  • the receiving module 1101 is configured to receive capability information of the radio access network device from an AMF network element.
  • the receiving module 1101 is configured to receive a connection establishment request message from the first RAN device, where the sending module 1103 is configured to send a connection establishment response message to the first RAN device, where the connection establishment response message includes the capability information. .
  • the receiving module 1101, the processing module 1102, and the sending module 1103 in the radio access network device may further implement other operations or functions of the second RAN device in the foregoing method, and details are not described herein again.
  • FIG. 11B is a schematic diagram showing another possible structure of the radio access network device involved in the foregoing embodiment.
  • the radio access network device includes a transceiver 1104 and a processor 1105, as shown in Figure 11B.
  • the processor 1105 is configured as a radio access network device to perform the corresponding functions of the second RAN device in the above method.
  • the transceiver 1104 is configured to implement communication between the second RAN device and the access and mobility management function network element/other radio access network device (eg, the first RAN device).
  • the radio access network device can also include a memory 1106 for coupling with a processor that retains program instructions and data necessary for the radio access network device.
  • the communication device can include a receiving module 1201 and a transmitting module 1203, as shown in FIG. 12A.
  • the communication device further includes a processing module 1202.
  • the communication device can be used to perform the operations of the AMF network element of FIG. 4 described above.
  • the receiving module 1201 is configured to receive a connection establishment request message from the RAN device.
  • the sending module 1203 is configured to send capability information of the RAN device to the RAN device.
  • the capability information is used to indicate the LADN supported by the RAN device.
  • the above communication device completes the connection establishment with the RAN device, and transmits the capability information of the RAN device to the RAN device.
  • the capability information can be used to switch the terminal device.
  • the capability information is also applicable to other communication application scenarios.
  • the foregoing capability information includes at least one of a data network name DNN, a network protocol IP address or a prefix, and IP routing information of the LADN.
  • the capability information of the RAN device can be used to indicate the LADN supported by the RAN device.
  • the foregoing capability information includes a correspondence between at least one of a DNN, an IP address or a prefix, and IP routing information of the LADN, and a cell identifier or a tracking area identifier.
  • the receiving module 1201, the processing module 1202, and the sending module 1203 in the communication device may also implement other operations or functions of the AMF in the foregoing method, and details are not described herein again.
  • FIG. 12B is a diagram showing another possible configuration of the communication device involved in the above embodiment.
  • the communication device includes a transceiver 1204 and a processor 1205, as shown in Figure 12B.
  • the processor 1205 is configured to perform the corresponding functions of the AMF network element in the above method.
  • the transceiver 1204 is configured to implement communication between the AMF network element and the terminal device/radio access network device/session management function network element.
  • the communication device can also include a memory 1206 for coupling with a processor that retains program instructions and data necessary for the communication device.
  • the communication device can include a receiving module 1301 and a transmitting module 1303, as shown in FIG. 13A.
  • the communication device further includes a processing module 1302.
  • the communication device can be used to perform the operations of the SMF network elements of Figures 5, 6 and 8 above. E.g:
  • the receiving module 1301 is configured to receive the session identifier and the network name of the first session from the terminal device.
  • the sending module 1303 is configured to send session management information to the radio access network RAN device, where the session management information includes an association between the session identifier and the network name.
  • the first RAN device preferentially selects the RAN device supporting the LADN as the handover target, so that the terminal device can access the LADN through the target RAN device, thereby improving the user experience.
  • the processing module 1302 is configured to determine that the terminal device accesses the LADN through the first session.
  • the first RAN device may send a handover request to the second RAN device supporting the specific LADN, so that after the mobile terminal accesses the second RAN device, A session is not terminated or suspended, so that services accessing that particular LADN are not terminated or suspended, further enhancing the user experience.
  • the processing module 1302 is configured to pre-configure a network name corresponding to the LADN; or the receiving module 1301 is configured to receive, by the AMF network element, a network name corresponding to the LADN; or the receiving module 1301 is further configured to receive from the PCF network element.
  • the network name corresponding to the LADN; or the receiving module 1301 is further configured to receive, by the data management network element, a network name corresponding to the LADN.
  • the receiving module 1301, the processing module 1302, and the sending module 1303 in the communication device may also implement other operations or functions of the SMF in the foregoing method, and details are not described herein again.
  • FIG. 13B shows another possible structural diagram of the communication device involved in the above embodiment.
  • the communication device includes a transceiver 1304 and a processor 1305, as shown in Figure 13B.
  • the processor 1305 is configured to perform the corresponding function of the SMF network element in the above method in the communication device.
  • the transceiver 1304 is configured to implement communication between the SMF network element and the terminal device/radio access network device/access and mobility management function network element.
  • the communication device can also include a memory 1306 for coupling with a processor that retains program instructions and data necessary for the communication device.
  • the terminal device may include a receiving module 1401 and a transmitting module 1402 as shown in FIG. 14A.
  • the terminal device further includes a sending module 1403.
  • the terminal device can be used to perform the operations of the terminal device in FIG. 9 described above. E.g:
  • the receiving module 1401 is configured to receive an association between the access network identifier and the LADN from the access network discovery network element (eg, the access network discovery and selection function network element in the 4G, or the PCF network element in the 5G).
  • the processing module 1402 is configured to access the access network corresponding to the access network identifier according to the association between the access network identifier and the LADN.
  • the terminal device when the terminal device needs to reselect the non-3GPP access network, the terminal device associates with the identifier of the access network according to the association between the obtained access network identifier and the network name of the LADN.
  • the network access device sends an access request. Since the access network device corresponding to the identifier of the access network supports the LADN, the terminal device can access the LADN service after replacing the access network, thereby improving the user experience.
  • the processing module 1402 is configured to determine that the terminal device accesses the LADN through the first session. Therefore, in the scenario of the non-3GPP access network, the terminal device learns the network name of the specific LADN through the first session by the terminal device, and according to the acquired identifier and LADN of the candidate access network that is available for access. The association between network names can be accessed to access network devices that support this particular LADN. Therefore, after the terminal device replaces the access network, the service of the specific LADN is not terminated, thereby improving the user experience.
  • the receiving module 1401, the processing module 1402, and the sending module 1403 in the terminal device may further implement other operations or functions of the terminal device in the foregoing method, and details are not described herein again.
  • FIG. 14B is a schematic diagram showing another possible structure of the terminal device involved in the above embodiment.
  • the terminal device includes a transceiver 1404 and a processor 1405 as shown in FIG. 14B.
  • the processor 1405 is configured to perform the corresponding function of the terminal device in the above method in the terminal device.
  • the transceiver 1404 is configured to implement communication between the terminal device and the access discovery network element.
  • the terminal device may also include a memory 1406 for coupling with a processor that stores program instructions and data necessary for the terminal device.
  • Figures 10B, 11B, 12B, 13B, and 14B only show a simplified design of the above apparatus. In practical applications, each of the above devices may include any number of transmitters, receivers, processors, controllers, memories, communication units, etc., and all devices that can implement the present application are within the scope of the present application.
  • the controller/processor for performing the above wireless access network device of the present application may be a central processing unit (CPU), a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), and a field programmable gate array. (FPGA) or other programmable logic device, transistor logic device, hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure.
  • the processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like.
  • the steps of a method or algorithm described in connection with the present disclosure may be implemented in a hardware or may be implemented by a processor executing software instructions.
  • the software instructions may be comprised of corresponding software modules that may be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable hard disk, CD-ROM, or any other form of storage well known in the art.
  • An exemplary storage medium is coupled to the processor to enable the processor to read information from, and write information to, the storage medium.
  • the storage medium can also be an integral part of the processor.
  • the processor and the storage medium can be located in an ASIC. Additionally, the ASIC can be located in a wireless access network device.
  • the processor and the storage medium can also exist as discrete components in the radio access network device.
  • the above embodiments it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • software it may be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions.
  • the computer program instructions When the computer program instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present invention are generated in whole or in part.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • the computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transfer to another website site, computer, server, or data center by wire (eg, coaxial cable, fiber optic, digital subscriber line (DSL), or wireless (eg, infrared, wireless, microwave, etc.).
  • the computer readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that includes one or more available media.
  • the usable medium may be a magnetic medium, such as a floppy disk, a hard disk, a magnetic tape, an optical medium such as a DVD, or a semiconductor medium such as a Solid State Disk (SSD).
  • SSD Solid State Disk

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Abstract

本申请涉及无线通信技术领域，提供了一种选择无线接入网设备的方法，包括：第一RAN设备获取第二RAN设备的能力信息，其中，能力信息用于指示第二RAN设备支持的LADN。第一RAN设备向第二RAN设备发送切换请求消息。通过本实施例提供的方案，可以使终端设备在切换后能够访问LADN，从而提高用户体验。

Description

一种选择无线接入网设备的方法及装置
本申请要求于2017年8月21日提交中国专利局、申请号为201710718740.2、申请名称为“一种选择无线接入网设备的方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及通信技术领域，特别涉及一种选择无线接入网设备的方法及装置。
背景技术
本地数据网络(Local Area Data Network，LADN)是第五代移动通信技术(the5th-Generation，5G)中提出的一种主要为企业、体育场活动、音乐厅等场景部署的网络。LADN的特点包括：只有当终端设备位于LADN的服务区域(Service Area，SA)内时，才能访问该LADN。当终端设备离开LADN的SA时，则不能访问LADN网络，且之前访问LADN的会话(LADN session)也会断开。
目前，当终端设备发生移动切换(Handover，HO)时，服务终端设备的源无线接入网络(Radio Access Network，RAN)设备根据终端设备的测量报告作出切换决定，然后从候选RAN设备中选择一个目标RAN设备，并发送切换请求至该目标RAN设备。
然而，当终端设备发生移动切换后，终端设备通过切换后的目标RAN设备可能无法访问LADN。如图1所示，RAN设备1(简称为RAN1)和RAN设备2(简称为RAN2)在LADN SA覆盖范围内，RAN设备3(简称为RAN3)不在LADN SA覆盖范围内。在移动切换前，终端设备位于RAN1覆盖范围内。当终端设备移动至RAN2和RAN3的覆盖范围内时，根据现有技术，RAN1可能会选择RAN3作为切换的目标，从而降低了用户体验。
发明内容
本发明实施例提供了一种选择无线接入网设备的方法及装置。
一方面，本申请的实施例提供了一种选择无线接入网RAN设备的方法，该方法包括：第一无线接入网络RAN设备获取第二RAN设备的能力信息；第一RAN设备向第二RAN设备发送切换请求消息。其中，能力信息用于指示第二RAN设备支持的本地数据网络LADN。例如，能力信息包括LADN的数据网络名称(data network name，DNN)、DNN索引、IP地址或前缀、IP路由信息中的至少一项。
根据上述方案，在终端设备发生移动切换时，第一RAN设备会根据获得的相邻的多个RAN设备的能力信息，向支持LADN的第二RAN设备发送切换请求，从而使移动终端接入第二RAN设备后可以访问LADN业务，提高了用户体验。
在一种可能的设计中，第一RAN设备可以通过如下方式获取第二RAN设备的能力信息：第一RAN设备向第二RAN设备发送连接建立请求消息(例如，Xn建立请求消息)，并从第二RAN设备接收连接建立响应消息。其中，连接建立响应消息包括第二RAN设备的能力信息。由此，第一RAN设备完成了与第二RAN设备的连接建立，并从第二RAN设备获取了第二RAN设备的能力信息。类似的，第一RAN设备可通过RAN设备之间的建立连接(例如Xn连接)过 程，获得其他相邻RAN的能力信息。
在一种可能的设计中，在第一RAN设备向第二RAN设备发送切换请求消息之前，该方法还包括：第一RAN设备确定终端设备通过第一会话访问LADN。由此，在终端设备通过第一会话访问某个特定LADN时，第一RAN设备可以向支持该特定LADN的第二RAN设备发送切换请求，从而使移动终端接入第二RAN设备后，第一会话不会被终断或暂停，使得访问该特定LADN的业务不会被终断或暂停，进一步提高了用户体验。
在一种可能的设计中，该方法还包括：第一RAN设备从会话管理功能SMF网元接收第一会话的会话标识和LADN的第一网络名称之间的关联。或者，第一RAN设备从SMF网元接收第二网络名称，确定所述第二网络名称对应LADN。由此，第一RAN设备获取到了第一会话的会话标识和网络名称(例如，第一网络名称或第二网络名称)的关联，可以根据此关联在终端设备发生移动切换时为终端设备选择切换目标。
再一方面，本申请还公开了一种通信方法，该方法包括：第二RAN设备从AMF网元获取第二RAN设备的能力信息；第二RAN设备向第一RAN设备发送第二RAN设备的能力信息。其中，能力信息用于指示第二RAN设备支持的本地数据网络LADN。
根据上述方案，第二RAN设备将从AMF网元获取的第二RAN设备的能力信息，发送给了第一RAN设备。第一RAN设备获得该能力信息后，可以在为终端设备选择切换目标时，优先将终端设备切换到支持LADN的RAN设备(例如第二RAN设备)，使终端设备在切换后能够访问LADN业务，从而提高了用户体验。
在一种可能的设计中，第二RAN设备可以通过如下方式获取能力信息：第二RAN设备在建立第二RAN和AMF网元之间的连接过程(例如，N2连接)中，从AMF网元获取第二RAN设备的能力信息。由此，第二RAN设备完成了与AMF网元的连接建立，并从AMF网元获取了第二RAN设备的能力信息。其中，第二RAN设备的能力信息可用于为终端设备进行切换的场景，还适用于其他通信应用场景。
在一种可能的设计中，第二RAN设备可以通过如下方式向第一RAN设备发送第二RAN设备的能力信息：第二RAN设备从第一RAN设备接收连接建立请求消息(例如，Xn建立请求消息)，向第一RAN设备发送连接建立响应消息(Xn建立响应消息)，其中，连接建立响应消息包括能力信息。由此，第一RAN设备完成了与第二RAN设备的连接建立，并从第二RAN设备获取了第二RAN设备的能力信息。
又一方面，本申请还公开了一种通信方法，包括：AMF网元从RAN设备接收连接建立请求消息(例如，NG建立请求消息)；AMF网元向RAN设备发送RAN设备的能力信息。其中，能力信息用于指示RAN设备支持的LADN。例如，AMF网元收到连接建立请求消息后，查找RAN设备的能力信息，再将此能力信息发送给RAN设备。
根据上述方案，AMF网元完成了与RAN设备的连接建立，并将RAN设备的能力信息发送给RAN设备。该能力信息可用于为终端设备进行切换的场景，此外，该能力信息还可适用于其他通信应用场景。
在一种可能的设计中，RAN设备的能力信息包括第一LADN的DNN、IP地址或前缀、IP路由信息中的至少一项。由此，RAN设备的能力信息可以表示RAN设备支持的LADN。
在一种可能的设计中，RAN设备的能力信息还包括第一LADN的DNN、IP地址或前缀、IP路由信息中的至少一项与小区标识或跟踪区标识之间的对应关系。例如，当RAN设备支持的LADN的覆盖范围为跟踪区粒度时，第一RAN设备可以根据第一LADN的DNN、IP地址或前缀、IP路由信息中的至少一项与跟踪区标识之间的对应关系，选择支持第一LADN的RAN设备(例 如，第二RAN设备)作为切换目标。或者，当RAN设备支持的LADN的覆盖范围为小区粒度时，第一RAN设备可以根据第一LADN的DNN、IP地址或前缀、IP路由信息中的至少一项与小区标识之间的对应关系，选择RAN设备(例如，第二RAN设备)下支持第一LADN的小区作为切换的目标小区。
又一方面，本申请还公开了一种通信方法，包括：SMF网元从终端设备接收第一会话的会话标识和网络名称；SMF网元向RAN设备发送会话管理信息。其中，会话管理信息包括会话标识和网络名称之间的关联。
根据上述方案，第一RAN设备优先选择支持LADN的RAN设备作为切换目标，使得终端设备可以通过目标RAN设备访问LADN，从而提高了用户体验。
在一种可能的设计中，该方法还包括：SMF网元确定终端设备通过第一会话访问本地数据网络LADN。因此，在终端设备通过第一会话访问某个特定LADN时，第一RAN设备可以向支持该特定LADN的第二RAN设备发送切换请求，从而使移动终端接入第二RAN设备后，第一会话不会被终断或暂停，使得访问该特定LADN的业务不会被终断或暂停，进一步提高了用户体验。
在一种可能的设计中，该方法还包括：SMF网元内预配置有与LADN对应的网络名称；或者，SMF从AMF网元获取与LADN对应的网络名称；或者，SMF网元从PCF网元获取与LADN对应的网络名称；或者，SMF网元从数据管理网元获取与LADN对应的所述网络名称。由此，SMF网元可获取LADN对应的网络名称。
又一方面，本申请实施例提供了一种无线接入网设备，该无线接入网设备具有实现上述方法中无线接入网设备(例如，上述第一RAN设备)行为的功能。所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块。在一个可能的设计中，无线接入网设备的结构中包括处理器和收发器，所述处理器被配置为处理无线接入网设备执行上述方法中相应的功能。所述收发器用于实现无线接入网设备与接入和移动性管理功能网元/其他无线接入网设备(例如，第二RAN设备)之间的通信。所述无线接入网设备还可以包括存储器，所述存储器用于与处理器耦合，其保存该无线接入网设备必要的程序指令和数据。
又一方面，本申请实施例提供了一种无线接入网设备，该无线接入网设备具有实现上述方法中无线接入网设备(例如，上述第二RAN设备)行为的功能。所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块。在一个可能的设计中，无线接入网设备的结构中包括处理器和收发器，所述处理器被配置为处理无线接入网设备执行上述方法中相应的功能。所述收发器用于实现无线接入网设备与接入和移动性管理功能网元/其他无线接入网设备(例如，第一RAN设备)之间的通信。所述无线接入网设备还可以包括存储器，所述存储器用于与处理器耦合，其保存该无线接入网设备必要的程序指令和数据。
又一方面，本申请实施例提供了一种通信装置，该通信装置具有实现上述方法中AMF网元行为的功能。所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块。在一个可能的设计中，通信装置的结构中包括处理器和收发器，所述处理器被配置为通信装置执行上述方法中相应的功能。所述收发器用于实现通信装置和终端设备/无线接入网设备(例如，第一或第二RAN设备)/会话管理功能网元之间的通信。所述通信装置还可以包括存储器，所述存储器用于与处理器耦合，其保存该通信装置必要的程序指令和数据。
又一方面，本申请实施例提供了一种通信装置，该通信装置具有实现上述方法中SMF网元行为的功能。所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块。在一个可能的设计中，通信装置的结构中包括处理器和收发器，所述处理器被配置为通信装置执行上述方法中相应的功能。所述收发器用于实现通信装置与终端设备/无线接入网设备(例如，第一或第二RAN设备)/接入和移动性管理功能网元之间的通信。所述通信装置还可以包括存储器，所述存储器用于与处理器耦合，其保存该通信装置必要的程序指令和数据。
又一方面，本申请实施例提供了一种通信方法，该方法包括：终端设备从接入网发现网元(例如，4G中的接入网络发现和选择功能网元，或者，5G中的PCF网元)接收接入网标识和LADN之间的关联；终端设备根据该关联接入接入网标识对应的接入网。
根据上述方案，当终端设备发生移动需要重新选择non-3GPP接入网时，终端设备会根据获得的接入网标识和LADN的网络名称之间的关联，向接入网的标识所对应的接入网设备发送连接请求。由于上述接入网的标识所对应的接入网设备支持LADN，所以终端设备在接入后可以访问LADN业务，从而提高了用户体验。
在一种可能的设计中，该方法还包括：在终端设备根据接入网标识和LADN之间的关联接入接入网标识对应的接入网之前，终端设备确定终端设备通过第一会话访问LADN。由此，在non-3GPP接入网络的场景下，终端设备通过获知终端设备通过第一会话访问某特定LADN的网络名称，并根据获取的可供接入的候选接入网的标识和LADN的网络名称之间的关联，可以在需要更换接入网的时候接入到支持该特定LADN的接入网设备。从而该特定LADN的业务不会被终断，提高了用户体验。
又一方面，本申请实施例提供了一种终端设备，该终端设备具有实现上述方法中终端设备行为的功能。所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块。在一个可能的设计中，终端设备的结构中包括处理器和收发器，所述处理器被配置为终端设备执行上述方法中相应的功能。所述收发器用于实现终端设备与无线接入网设备/接入和移动性管理功能网元/接入发现网元之间的通信。所述终端设备还可以包括存储器，所述存储器用于与处理器耦合，其保存该终端设备必要的程序指令和数据。
又一方面，本申请实施例提供了一种计算机可读存储介质，所述计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机执行上述各方面所述的方法。
又一方面，本申请实施例提供了一种包含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各方面所述的方法。
又一方面，本申请提供了一种芯片系统，该芯片系统包括处理器，用于支持上述无线接入网设备或通信装置或终端设备实现上述方面中所涉及的功能，例如，生成或处理上述方法中所涉及的信息。在一种可能的设计中，所述芯片系统还包括存储器，所述存储器，用于保存数据发送设备必要的程序指令和数据。该芯片系统，可以由芯片构成，也可以包含芯片和其他分立器件。
附图说明
为了更清楚地说明本发明实施例或背景技术中的技术方案，下面将对本发明实施例或背景技术中所需要使用的附图进行说明。
图1为本申请现有技术中终端设备发生移动切换的场景示意图；
图2为根据本申请实施例提供的5G通信系统示意图；
图3为根据本申请实施例提供的一种选择无线接入网设备的方法的流程图；
图4为根据本申请实施例提供的一种通信方法；
图5为根据本申请实施例提供的又一种通信方法；
图6为根据本申请实施例提供的又一种通信方法
图7为根据本申请实施例提供的一种切换方法
图8为根据本申请实施例提供的又一种通信方法；
图9为根据本申请实施例中提供的又一种选择无线接入网设备的具体流程图；
图10A、10B为根据本发明实施例中提供的无线接入网络设备的结构示意图；
图11A、11B为根据本发明实施例中提供的又一无线接入网络设备的结构示意图；
图12A、12B为根据本发明实施例中提供的通信装置的结构示意图；
图13A、13B为根据本发明实施例中提供的又一种通信装置的结构示意图；
图14A、14B为根据本发明实施例中提供的终端设备的结构示意图。
具体实施方式
本申请描述的网络架构以及业务场景是为了更加清楚的说明本申请的技术方案，并不构成对本申请提供的技术方案的限定，本领域普通技术人员可知，随着网络架构的演变和新业务场景的出现，本申请提供的技术方案对于类似的技术问题，同样适用。
本申请中，“多个”是指两个或两个以上。“和/或”，描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。字符“/”一般表示前后关联对象是一种“或”的关系。
图2示出了本申请实施例可能试用的一种5G通信系统示意图。在5G移动网络架构中，移动网关的控制面功能和转发面功能解耦，其分离出来的控制面功能与第三代合作伙伴计划(third generation partnership project，3GPP)传统的控制网元移动性管理实体(mobility management entity，MME)等合并成统一的控制面(control plane)。用户面功能(User plane function，UPF)网元能实现服务网关(serving gateway，SGW)和分组数据网络网关(packet data network gateway，PGW)的用户面功能(SGW-U和PGW-U)。进一步的，统一的控制面网元可以分解成接入和移动性管理功能(access and mobility management function，AMF)网元和会话管理功能(session management function，SMF)网元。
此外，本申请实施例还可以适用于面向未来的其他通信技术。本申请实施例描述的系统架构以及业务场景是为了更加清楚的说明本申请实施例的技术方案，并不构成对于本申请实施例提供的技术方案的限定，本领域普通技术人员可知，随着网络架构的演变和新业务场景的出现，本申请实施例提供的技术方案对于类似的技术问题，同样适用。
如图2所示，本申请实施例提供了一种通信系统。例如，该通信系统至少包括终端设备201、RAN设备202、AMF网元205、SMF网元206和UPF网元203。
其中，本系统中所涉及到的终端设备201可以为支持LADN网络的终端设备。本发明能够应用的用户设备不受限于5G网络，还可以应用于所有种类的终端设备，包括：手机、物联网设备、智能家居设备、工业控制设备、车辆设备等等。只要有LADN网络的需求，以及存在上述技术问题的终端设备，均可以使用本发明实施例提供的技术方案。所述终端设备也可以称为用户设备(user equipment，UE)移动站(Mobile Station)、移动台(Mobile)、远程站(Remote Station)、远程终端(Remote Terminal)、接入终端(Access Terminal)、用户终端(User  Terminal)、用户代理(User Agent)、用户设备(User Device or User Equipment)，在此不作限定。上述终端设备还可以车与车(Vehicle-to-vehicle，V2V)通信中的汽车、机器类通信中的机器等。
本系统中所涉及到的RAN设备202是一种用于为终端设备201提供无线通信功能的装置，所述RAN设备可以包括各种形式的基站，例如：宏基站，微基站(也称为小站)，中继站，接入点等。在采用不同的无线接入技术的系统中，具备基站功能的设备的名称可能会有所不同，例如，在LTE系统中，称为演进的节点B(evolved NodeB，eNB或者eNodeB),在第三代(3rd generation，3G)系统中，称为节点B(Node B)等。在新一代系统中，称为gNB(gNodeB)。
上述UPF网元203能实现SGW和PGW的用户面功能(SGW-U和PGW-U)。UPF网元可连接至相同或不同的数据网络204(data network，DN)，从而实现业务的数据传输。所述UPF网元也可称为UPF设备或UPF实体。
上述AMF网元205可负责终端设备的附着、移动性管理、跟踪区更新流程等。AMF网元也可称为AMF设备或AMF实体。
上述SMF网元206可负责终端设备的会话管理。例如，会话管理包括用户面设备的选择、用户面设备的重选、网络协议(internet protocol，IP)地址分配、服务质量(quality of service，QoS)控制，以及会话的建立、修改或释放等。SMF网元也可称为SMF设备或SMF实体。
可选的，本通信系统还包括策略控制功能(policy control function，PCF)网元207。PCF网元207包含策略控制和基于流计费控制的功能。例如，PCF网元207可实现用户签约数据管理功能、策略控制功能、计费策略控制功能、QoS控制等。PCF网元可也称为PCF实体或PCF设备。
可选的，本通信系统还包括数据管理设备，例如，统一数据管理(unified data management，UDM)设备208。UDM设备208用于存储用户的签约数据，例如：移动性管理相关的签约数据以及会话管理相关的签约数据。UDM设备也可称为UDM实体或UDM网元。
下面以该通信系统为例，通过一些实施例对本申请的技术方案进行详细说明。下面这几个实施例可以相互结合，对于相同或相似的概念或过程可能在某些实施例不再赘述。
图3为本申请实施例提供的一种选择无线接入网设备的方法的流程图。该方法可用于终端设备在3GPP接入网络下切换RAN设备的场景。该方法由第一RAN设备执行。例如，第一RAN设备为图2中的RAN设备201。如图3所示，该方法可以包括：
S301、第一RAN设备获取第二RAN设备的能力信息。其中，第二RAN设备的能力信息用于指示第二RAN设备支持的LADN。
例如，能力信息包括LADN的数据网络名称(data network name，DNN)、DNN索引、IP地址或前缀、IP路由信息中的至少一项。也就是说，当第二RAN设备的能力信息包括LADN的DNN、DNN索引、IP地址或前缀、IP路由信息中的至少一项时，第二RAN设备为支持LADN的RAN设备。
可选的，当上述第二RAN设备支持的LADN的覆盖范围为跟踪区域(tracking area，TA)粒度时，上述第二RAN设备的能力信息可包括所述LADN的DNN、DNN索引、IP地址或前缀、IP路由信息中的至少一项与跟踪区标识之间的对应关系。
或者，当上述第二RAN设备支持的LADN的覆盖范围为小区(cell)粒度时(即，仅第二RAN设备下的特定小区支持LADN)，上述第二RAN设备的能力信息可包括所述LADN的DNN、DNN索引、IP地址或前缀、IP路由信息中的至少一项与小区标识之间的对应关系。
需要说明的是，第一RAN设备可获取与该第一RAN设备相邻的多个RAN设备的能力信息。获取到各RAN设备的能力信息至少包括第二RAN设备的能力信息。此外，第一RAN设备还可获取其他支持LADN的RAN设备的能力信息。
可选的，当相邻RAN设备不向第一RAN设备反馈能力信息，可认为该相邻RAN设备不支持LADN。
第一RAN设备如何获取第二RAN设备的能力信息将结合图4进一步描述。
S303、第一RAN设备向第二RAN设备发送切换请求消息。
第一RAN设备在获取到第二RAN设备的能力信息后，获知第二RAN设备为支持LADN的RAN设备。在第一RAN设备确定为终端设备进行切换后，第一RAN设备可根据第二RAN设备的能力信息，选择该第二RAN设备作为切换的目标，并向第二RAN设备发送切换请求消息。
可选的，当上述第二RAN设备支持的LADN的覆盖范围为小区粒度时，第一RAN设备根据能力信息中的小区标识，选择第二RAN设备下支持LADN的小区作为切换的目标小区，并向所述目标小区发送切换请求。
步骤S303将结合图7做进一步描述。
因此，根据本发明实施例的方法，在终端设备发生移动切换时，第一RAN设备(即源RAN设备)会根据获得的相邻的多个RAN设备的能力信息，向支持LADN的第二RAN设备发送切换请求，从而使移动终端接入第二RAN设备后可以访问LADN业务，提高了用户体验。本发明可适用于切换前终端设备未访问LADN的场景，也可适用于切换前终端设备访问LADN的场景。
可选的，在步骤303前，第一RAN设备可执行如下S302。
S302、第一RAN设备确定终端设备通过第一会话访问所述LADN。
例如，在切换前，终端设备通过第一会话访问某个特定的LADN。例如，该特定的LADN为LADN1，LADN1的网络名称为DNN1。在第一RAN设备做出切换决定后，确定终端设备通过第一会话访问LADN1。例如，由于第一RAN设备中保存有第一会话的标识与LADN1的DNN1的关联，第一RAN设备即可确定终端设备之前通过第一会话访问LADN1。
第一RAN设备可根据DNN1和获取到的各RAN设备的能力信息选择切换目标。例如，第二RAN设备的能力信息包括DNN1，以此表示第二RAN设备支持DNN1对应的LADN1。由此，第一RAN设备会选择同样能够支持LADN1的第二RAN设备作为切换目标，并向第二RAN设备发送切换请求消息。若获取到的各RAN设备的能力信息都不包括DNN1，则第一RAN设备可参考现有技术从候选RAN设备中选择切换目标RAN设备。
因此，通过上述方案，在终端设备通过第一会话访问某个特定LADN时，第一RAN设备可以向支持该特定LADN的第二RAN设备发送切换请求，从而使移动终端接入第二RAN设备后，第一会话不会被终断或暂停，使得访问该特定LADN的业务不会被终断或暂停，进一步提高了用户体验。
可选的，本方法还包括以下两种实现方式中的任一种，以获取第一会话的标识与LADN的网络名称的关联。
在一种可能的实现方式中，第一RAN设备从SMF网元(例如，图2中的SMF网元206)接收第一会话的会话标识和LADN的网络名称之间的关联。在这种实现方式中，可由SMF网元来确定第一会话的会话标识和LADN的网络名称之间的关联；或者，SMF网元从AMF网元(例如，图2中的AMF网元205)或PCF网元(例如，图2中的PCF网元207)中获得第一会话的会话标识和LADN的网络名称之间的关联。
在另一种可能的实现方式中，第一RAN设备从SMF网元接收第一会话所对应的网络名称。 在这种方式中，由第一RAN设备来确定第一会话的会话标识和LADN的网络名称之间的关联。
可选的，第一RAN设备还可以保存第一会话的会话标识和LADN的网络名称之间的关联。以上几种实现方式将分别结合图5和图6进一步描述。
图4为本申请实施例中提供的一种通信方法。如图4所示，该方法可以包括：
S401：第二RAN设备向AMF网元发送连接建立请求消息。相应的，AMF网元从第二RAN设备接收连接建立请求消息。
该连接建立请求消息用于请求建立第二RAN设备和AMF网元之间的设备连接，可以发生在设备上电时。具体的，第二RAN设备和AMF之间的连接可以是N2连接。例如，该连接建立请求消息可以为NG建立请求(NG setup request)消息。
S402：上述AMF网元接收到上述连接建立请求消息后，向第二RAN设备发送连接建立响应消息。相应的，第二RAN设备从AMF网元接收连接建立响应消息。上述连接建立响应消息包括上述第二RAN设备的能力消息。能力信息用于指示第二RAN设备支持的LADN。
例如，该连接建立响应消息可以为NG建立响应(NG setup response)消息。
例如，AMF网元收到连接建立请求消息后，查找第二RAN设备的能力信息。其中，上述AMF网元获得第二RAN设备的能力消息的方式包括以下中的任一种：
在一种可能的实现方式中，在AMF网元上提前配置有各个RAN设备的能力信息(包括第二RAN设备的能力信息)。例如，AMF网元内配置有AMF的能力信息(即AMF设备支持的LADN，以及LADN对应的SA)。RAN设备可向该AMF设备上报各自的位置信息，AMF设备根据RAN设备上报的位置信息以及LADN的SA的分布情况，确定RAN设备支持的LADN，即确定了RAN设备的能力信息。例如，上述连接建立请求消息中携带第二RAN设备的位置信息，AMF网元收到建立请求消息后，确定第二RAN设备支持的LADN，并通过连接建立响应消息将第二RAN设备的能力信息发送至第二RAN设备。
在另一种可能的实现方式中，AMF网元在AMF网元与PCF网元建立连接(例如，N15连接)的过程中从PCF网元(例如，图2中的PCF网元207)获取各个RAN设备的能力信息(包括第二RAN设备的能力信息)。
此外，AMF网元还可采用其他方式获得第二RAN设备的能力消息，本申请对此不做限定。
例如，上述步骤S401和S402可以在第二RAN设备上电时进行。
至此，第二RAN设备完成了与上述AMF网元的连接建立，并从上述AMF网元获取了上述第二RAN设备的能力信息。第二RAN设备的能力信息可用于为终端设备进行切换的场景，此外，还适用于其他通信应用场景，该发明并不在此限制。
可选的，S403：第二RAN设备接收到上述来自AMF网元的连接建立响应消息后，保存上述第二RAN设备的能力消息。
进一步地，在第二RAN设备获得了上述第二RAN设备的能力信息后，可将此能力信息发送给第一RAN设备。具体过程为：
S404：第一RAN设备向第二RAN设备发送连接建立请求消息。相应的，第二RAN设备从第一RAN设备接收连接建立请求消息。
该连接建立请求消息用于请求建立第一RAN设备和第二RAN设备之间的设备连接，可以发生在设备上电过程中。例如，第一RAN设备和第二RAN设备的连接可以是Xn连接。例如，该连接建立请求消息可以为Xn建立请求(Xn setup request)消息。
S405：第二RAN设备接收到第一RAN设备发送的上述连接建立请求消息后，向第一RAN设备发送连接建立响应消息。相应的，第一RAN设备从第二RAN设备接收连接建立响应消息。 上述连接建立响应消息包括上述第二RAN设备所获得第二RAN设备的能力信息。例如，该连接建立响应消息可以为Xn建立响应(Xn setup response)消息。
S406：第一RAN设备接收到上述来自第二RAN设备的连接建立响应消息后，保存上述第二RAN设备的能力消息与第二RAN设备的标识信息之间的关联。其中，第二RAN设备的标识信息用于指示第二RAN设备。
至此，第一RAN设备完成了与第二RAN设备的连接建立，并从第二RAN设备获取了上述第二RAN设备的能力信息。类似的，第一RAN设备可通过RAN设备之间的建立连接过程，获得其他相邻RAN的能力信息。该方法不受限于本申请实施例的应用场景，还适用于其他通信应用场景。
根据上述方案，第二RAN设备从AMF网元获取第二RAN设备的能力信息，并向第一RAN设备发送该能力信息。这样，第一RAN设备获得能力信息后，可以在为终端设备选择切换目标时，优先将终端设备切换到支持LADN的RAN设备(例如第二RAN设备)，使终端设备在切换后能够访问LADN业务，从而提高了用户体验。
可选的，第一RAN设备也可通过类似S401和S402的方式获取第一RAN设备的能力信息。此外，步骤S404中第一RAN设备向第二RAN设备发送的连接建立请求消息还可携带第一RAN设备的能力信息。换句话说，在两个RAN设备建立连接的过程中，可以互相通知各自的能力信息，即，通知各自支持的LADN的网络名称。
图5和图6分别为本申请实施例中提供的又一种通信方法。图5或图6中的方法可在会话(例如第一会话)的建立流程中执行。其中，区别在于：在图5的例子中，由SMF网元来确定第一会话的会话标识和LADN的网络名称之间的关联。在图6的例子中，由第一RAN设备来确定第一会话的会话标识和LADN的网络名称之间的关联。
如图5所示，该方法可以包括：
S501：终端设备通过第一RAN设备向AMF网元发送会话建立请求消息。相应的，AMF网元从第一RAN设备接收会话建立请求消息。该会话建立请求消息用于请求建立第一会话。例如，终端设备向AMF网元发送非接入层(non-access stratum，NAS)消息，该NAS消息包括第一会话的会话标识(session ID)、网络名称，和会话管理(session management，SM)信息(例如，N1SM information)。其中，会话管理信息包括该会话建立请求消息。
例如，网络名称包括DNN、DNN索引、IP地址或前缀、IP路由信息中的至少一项。
S502：上述AMF网元接收到上述会话建立请求消息后，选择SMF网元，并向SMF网元发送上述第一会话的会话标识、网络名称、以及会话管理信息。
S503：上述SMF网元接收到上述第一会话的会话标识、网络名称、以及会话管理信息后，选择UPF网元，并向UPF网元发送用户面连接建立请求消息，以建立SMF网元和UPF网元之间的连接(例如，N4连接)。相应的，UPF网元从SMF网元接收用户面连接建立请求消息。例如，上述用户面连接建立请求消息可以为N4会话建立请求消息。
S504：UPF网元接收到上述用户面连接建立请求消息后，向SMF网元发送用户面连接建立响应消息。相应的，SMF网元从UPF网元接收用户面连接建立响应消息。例如，上述用户面连接建立响应消息可以为N4会话建立响应消息。
S505：上述SMF网元获知终端设备通过第一会话访问LADN。
例如，SMF网元可通过如下方式中任一获取终端设备通过第一会话访问LADN：
第一种：SMF网元确定终端设备通过第一会话访问LADN。
例如，SMF网元根据步骤S502中携带的网络名称，以及获取的LADN对应的网络名称， 判断终端设备是否通过第一会话访问LADN。例如，若获取的LADN对应的网络名称中包括步骤S502中携带的网络名称，则SMF网元确定终端设备通过第一会话访问LADN。
例如，SMF网元可通过如下方式中任一获取LADN对应的网络名称：
(a1)SMF网元内预配置有LADN对应的网络名称；
(a2)SMF网元从AMF网元获取LADN对应的网络名称；
(a3)SMF网元从PCF网元获取LADN对应的网络名称；
(a4)SMF网元从数据管理设备(例如，图2中的UDM设备208)获取LADN对应的网络名称。
此外，SMF网元还可采用其他方式获取LADN对应的网络名称，本申请对此不做限定。
第二种：SMF网元从AMF网元获知终端设备通过第一会话访问LADN。
例如，AMF网元内预配置有LADN对应的网络名称。AMF网元可根据步骤S501中携带的网络名称，以及上述预配置的LADN对应的网络名称，判断终端设备是否通过第一会话访问LADN。例如，若预配置的LADN对应的网络名称中包括步骤S501中携带的网络名称，则AMF网元确定终端设备通过第一会话访问LADN。AMF网元可以向SMF网元发送用于指示终端设备通过第一会话访问LADN的指示信息，使得SMF网元根据指示信息获知终端设备通过第一会话访问LADN。
第三种：SMF网元从PCF网元获知终端设备通过第一会话访问LADN。
例如，SMF网元向PCF网元发送步骤S502中携带的网络名称，PCF网元根据SMF网元发送的网络名称以及获取的LADN对应的网络名称，判断终端设备是否通过第一会话访问LADN。例如，若获取的LADN对应的网络名称中包括SMF网元发送的网络名称，则PCF网元确定终端设备通过第一会话访问LADN。PCF网元可以向SMF网元发送用于指示终端设备通过第一会话访问LADN的指示信息，使得SMF网元根据指示信息获知终端设备通过第一会话访问LADN。
例如，PCF网元可通过如下方式中任一获取LADN对应的网络名称：
(b1)PCF网元内预配置有LADN对应的网络名称；
(b2)PCF网元从AMF网元获取LADN对应的网络名称。
(b3)PCF网元从UDM网元获取LADN对应的网络名称。
通过上述任一一种方式，SMF网元即可获知终端设备通过第一会话访问LADN。
可选的，SMF网元保存第一会话的会话标识和上述LADN的网络名称之间的关联。举例来说，第一会话的会话标识为session ID 1，LADN的网络名称为DNN1，则SMF网元保存session ID 1和DNN1之间的关联，例如表1所示。
表1
会话标识 网络名称
Session ID 1 DNN 1
可选的，当终端设备同时发起多个会话时，SMF网元保存多组会话标识和网络名称之间的关联。
需要说明的是，上述表1仅为一种示例，本申请所涉及的会话标识和上述LADN的网络名称之间的关联并不以上述表1为限，只要是能够表示会话标识与上述LADN的网络名称的对应关系，均在本申请的保护范围内。
此外，需要说明的是，本发明并不限制步骤S505的执行时间，只要SMF通过S502获得网络名称后，即可执行步骤S505。
S506：上述SMF网元获知终端设备通过第一会话访问LADN后，向AMF网元发送第一会话 的会话标识和上述LADN的网络名称之间的关联。
可选的，SMF网元向AMF网元发送SM信息，例如，N2 SM information。其中，N2 SM information包括上述会话标识和上述LADN的第一网络名称之间的关联。
可选的，若SMF网元通过步骤S505确定终端设备通过第一会话访问的数据网络不是LADN，则无需向AMF网元/第一RAN设备发送会话标识和网络名称之间的关联。
S507：上述AMF网元接收到上述第一会话的会话标识和LADN的第一网络名称之间的关联后，向第一RAN设备转发会话请求消息。上述会话请求消息包含第一会话的会话标识和LADN的第一网络名称之间的关联。相应的，第一RAN设备从AMF网元接收会话请求消息。例如，上述会话请求消息可以为N2会话请求消息。
可选的，S508：第一RAN设备接收第一会话的会话标识和上述LADN的网络名称之间的关联后，保存上述会话标识和上述LADN的网络名称之间的关联。此关联用于在终端设备发生移动切换时为终端设备选择切换目标。
至此，第一RAN设备从SMF网元接收到了上述第一会话的会话标识和上述LADN的网络名称之间的关联。步骤S508后，可参考现有技术执行会话建立过程的后续步骤，此处不再赘述。
图6为本申请实施例中提供的又一种通信方法。SMF网元如图6所示，该方法包括：
S601：终端设备通过第一RAN设备向AMF网元发送会话建立请求消息。相应的，AMF网元从第一RAN设备接收会话建立请求消息。该会话建立请求消息用于请求建立第一会话。
S602：上述AMF网元接收到上述会话建立请求消息后，选择SMF网元，并向SMF网元发送上述第一会话的会话标识、网络名称、以及会话管理信息。
S603：上述SMF网元接收到上述第一会话的会话标识、网络名称、以及会话管理信息后，选择UPF网元，并向UPF网元发送用户面连接建立请求消息，以建立SMF网元和UPF网元之间的连接。相应的，UPF网元从SMF网元接收用户面连接建立请求消息。
S604：UPF网元接收到上述用户面连接建立请求消息后，向SMF网元发送用户面连接建立响应消息。相应的，SMF网元从UPF网元接收用户面连接建立响应消息。
步骤S601至S604与图5中步骤S501至S504相同，在此不再赘述。
S605：SMF网元接收到会话建立响应消息后，向AMF网元发送步骤S602中携带的第一会话的会话标识和网络名称。
可选的，SMF网元向AMF网元发送SM信息，例如，N2 SM information。其中，N2 SM information包括上述会话标识和网络名称。步骤S605与图5中步骤S506的区别在于，在图5的例子中，由SMF网元来获知终端设备通过第一会话访问LADN后，才会将上述会话标识和上述LADN的网络名称之间的关联发送给第一RAN设备。而在图6的例子中，SMF网元不做判断也不知晓终端设备是否通过第一会话访问LADN，SMF网元可直接将接收到的会话标识和网络名称发送给第一RAN设备，然后由第一RAN设备来确定该网络名称是否对应LADN。
S606：上述AMF网元接收到上述会话标识和网络名称后，向第一RAN设备发送会话请求消息。上述会话请求消息包含上述会话标识和网络名称。
例如，上述会话请求消息可以为N2会话请求消息。
S607：第一RAN设备接收到上述会话请求消息后，确定终端设备通过第一会话访问LADN。
例如，第一RAN设备通过类似步骤S401和S402的方式获取第一RAN设备的能力信息，从而获知LADN对应的网络名称。第一RAN设备根据步骤S606中获取的第一会话的会话标识和网络名称，判断终端设备是否通过第一会话访问LADN。例如，若获取的LADN对应的网络名称中包括步骤S606中携带的网络名称，则第一RAN设备确定终端设备通过第一会话访问 LADN。
可选的，S608：第一RAN设备确定终端设备通过第一会话访问LADN后，保存第一会话的会话标识和上述LADN的网络名称之间的关联。此关联用于在终端设备发生移动切换时为终端设备选择切换目标。
至此，第一RAN设备从SMF网元确定了第一会话的会话标识和上述LADN的网络名称之间的关联。步骤S608之后，可参考现有技术执行会话建立过程的后续步骤，此处也不再赘述。
图7为本申请实施例中提供的一种切换方法。如图7所示，该方法可以包括：
S701：第一RAN设备向终端设备发送测量控制信息，用于获得终端设备的测量报告。
可选的，该测量控制信息可以包含需要测量的对象、小区列表和报告方式中的至少一项。
S702：终端设备根据接收到的上述测量控制信息进行测量，然后将测量报告发送给第一RAN设备。上述测量报告包括候选RAN设备和候选RAN设备中各RAN设备覆盖范围内的小区标识。
其中，上述候选RAN设备为终端设备可以接入的RAN设备。本申请中不限定候选RAN设备的个数，且候选RAN设备中的至少一个RAN设备支持LADN业务。
S703：第一RAN设备根据接收到的测量报告做出切换决定。
例如，在第一RAN设备根据测量报告决定要为终端设备进行切换后，第一RAN设备根据在与其他RAN设备建立连接过程中获取到的其他RAN设备的能力信息，查找候选RAN设备中是否存在支持LADN的RAN设备(例如上述的第二RAN设备)。由此，第一RAN设备选择第二RAN设备作为切换目标。因此，移动终端接入第二RAN设备后可以访问LADN业务，提高了用户体验。
可选的，在第一RAN设备根据测量报告决定要为终端设备进行切换后，第一RAN设备先确定终端设备通过第一会话访问LADN。例如，第一RAN设备可根据通过图5或图6的过程获取的第一会话会话标识和LADN的网络名称之间的关联，确定终端设备通过第一会话访问LADN。第一RAN设备判断上述候选RAN设备中是否存在能力信息中包含上述网络名称的RAN设备(例如上述的第二RAN设备)。其中，第一RAN设备可以通过执行步骤S401至S406来获取各RAN设备的能力信息。如果候选RAN设备中存在能力信息中包含上述网络名称的RAN设备，则第一RAN设备选择该RAN设备作为切换目标。由此，移动终端接入第二RAN设备后，访问该特定LADN的业务不会被终断或暂停，进一步提高了用户体验。
进一步的，当该RAN设备支持的LADN的覆盖范围为小区粒度时，第一RAN设备选择该RAN设备下支持LADN的小区作为切换的目标小区。
如果候选RAN设备中不存在能力信息中包含上述网络名称的RAN设备，可参考现有技术从候选RAN设备中选择切换目标。
例如，第一RAN设备中保存的候选RAN设备的能力信息可以如下述表2所示。
表2
候选RAN设备 能力信息
ID 1 DNN 1
ID 2 DNN 2，cell 1的小区标识
ID 3 DNN 2，DNN 3
其中，如上述表2所示，候选的RAN设备包括RAN 1、RAN 2、RAN 3和RAN 4。RAN 1、RAN 2、RAN 3和RAN 4的标识分别为ID 1、ID 2、ID 3和ID 4。第一RAN设备中保存了这4个候选RAN设备的能力信息，以能力信息为DNN为例。RAN 1的能力信息包括DNN1，表示RAN 1支持DNN1 对应的LADN 1。RAN 2的能力信息包括DNN2和cell 1的小区标识，表示LADN 2是以小区为粒度的，且RAN 2下的小区cell 1支持DNN2对应的LADN。RAN 3的能力信息包括DNN2和DNN3，标识RAN 3分别支持DNN2对应的LADN 2和DNN3对应的LADN 3。此外，由于第一RAN设备中没有RAN4的能力信息，可认为RAN 4不支持LADN。
假定终端设备的第一会话所对应的网络名称为DNN 1。当终端设备发生移动切换时，第一RAN设备根据获取到的上述能力信息，选择能力信息包括DNN 1的RAN 1作为切换的目标。
或者，若终端设备的第一会话所对应的网络名称为DNN 2。当终端设备发生移动切换时，第一RAN设备从能力信息包括DNN 2的RAN 2和RAN 3中选择一个RAN设备作为切换的目标。进一步的，当第一RAN设备选择RAN 2作为切换的目标时，还应选择cell 1作为切换的目标cell。
或者，若终端设备的第一会话所对应的网络名称为DNN 4。当终端设备发生移动切换时，候选RAN设备中不存在能力信息包含DNN 4的RAN设备。此时，第一RAN设备优先选择能力信息包括DNN 2和DNN 3的RAN 3作为切换的目标。这样，可以保证终端设备发生移动切换后，可以访问DNN2对应LADN 2或DNN2对应的LADN 3，提高了用户体验。
或者，假定终端设备的第一会话不是LADN session。这种场景下，第一RAN设备可参考上述第一会话所对应的网络名称为LADN 4的场景来选择切换目标，此处不再赘述。
S704：第一RAN设备发送切换请求至上述目标RAN(例如第二RAN设备)。
S705：目标RAN设备收到上述切换请求后，进行参数检查及资源预留等切换处理。处理成功后，目标RAN设备将向第一RAN设备发送切换应答消息。
至此，完成了第一RAN设备切换至目标RAN设备的过程。
图8为本申请实施例中提供的又一种通信方法。图8将结合图5和图6进行描述。如图8所示，该方法可以包括：
S801：SMF网元从终端设备接收上述第一会话的会话标识和网络名称。
其中，SMF可以通过图6中的步骤S502或图6中的步骤S602获得上述第一会话的会话标识和网络名称，此处不再赘述。
S803：上述SMF网元接收到上述第一会话的会话标识和网络名称后，向第一RAN设备发送会话管理信息。其中，上述会话管理信息包括上述第一会话的会话标识和网络名称之间的关联。
步骤S803可参考图5中步骤S506或图6中S605的描述，此处不再赘述。
因此，通过本发明实施例的方法，第一RAN设备优先选择支持LADN的RAN设备作为切换目标，使得终端设备可以通过目标RAN设备访问LADN，从而提高了用户体验。
可选的，在S803之前，该方法还可以包括：
S802：上述SMF网元接收到上述第一会话的会话标识和网络名称后，确定终端设备通过上述第一会话访问本地数据网络LADN。
上述SMF网元确定终端设备通过上述第一会话访问LADN的具体过程以及SMF网元获取LADN对应的网络名称的方式可参考S505，此处不再赘述。
因此，第一RAN设备获取到了第一会话的会话标识和网络名称的关联，当终端设备发生移动切换时，第一RAN设备根据上述关联，确定该终端设备是否具有访问LADN的会话。当终端设备具有访问LADN的会话，第一RAN设备选择支持该LADN的RAN设备作为切换目标。
本申请还提供又一种选择无线接入网设备的方法。该方法可适用于non-3GPP接入网络的场景。如图9所示，该方法可以包括：
S901：接入发现网元向终端设备发送接入网信息。相应的，终端设备从接入发现网元接收接入网信息。该接入网信息包括接入网的标识和LADN的网络名称之间的关联。
例如，上述接入发现网元可以为第四代移动通信系统(4G)中的接入网络发现和选择功能(Access Network Discovery and Selection Function，ANDSF)网元，或者，也可以为第五代移动通信系统(5G)中的PCF网元(例如，图2中的PCF网元207)，或者，也可以为未来通信系统中能够向终端设备提供接入网信息的网元，在此并不限定。接入发现网元的数量可以为一个或者多个，本申请对接入发现网元的数量也不做限定。
上述接入网的标识可用于标识不同的接入网。例如，接入网的标识可以为服务集标识(Service Set Identifier，SSID)。
可选的，上述接入网信息还包括接入网的接入技术类型。例如，接入技术类型包括无线局域网(Wireless Local Area Network，WLAN)、或全球微波互联接入网(Worldwide Interoperability for Microwave Access，WiMAX)等。
S902：终端设备接收到上述接入网信息后，获取接入网的标识和LADN的网络名称之间的关联。
本申请中接入发现网元可以为一个或者多个。终端设备可以获取一组或者多组接入网标识和LADN的网络名称之间的关联。例如，在一种实现方式中，终端设备可以从一个接入发现网元获取多组接入网的标识和LADN的网络名称之间的关联。在另一种实现方式中，终端设备可以从多个接入发现网元获取多组接入网的标识和LADN的网络名称之间的关联。例如，终端设备获取的接入的网标识和LADN的网络名称之间的关联可以如下述表3所示。
表3
接入网的标识 网络名称
SSID 1 DNN 1
SSID 2 DNN 2，DNN 3
其中，如上述表3所示，终端设备获取2组接入网的标识和LADN的网络名称之间的关联。其中，以接入网标识为SSID为例。接入网1和接入网2的标识分别为：SSID1和SSID2。LADN1、LADN 2和LADN 3的网络名称分别为DNN 1、DNN 2和DNN3。表3中接入网的标识与LADN的网络名称之间的关联表示：SSID 1对应的接入网1支持LADN 1；SSID 2对应的接入网2支持LADN 2和LADN 3。
S904：终端设备根据上述S902中的接入网标识和LADN的网络名称之间的关联，接入接入网的标识对应的接入网设备。
根据本发明实施例，当终端设备发生移动需要重新选择non-3GPP接入网时，终端设备会根据获得的接入网标识和LADN的网络名称之间的关联，向接入网的标识所对应的接入网设备发送接入请求。由于上述接入网的标识所对应的接入网设备支持LADN，所以终端设备在更换接入网后可以访问LADN业务，从而提高了用户体验。本发明实施例可适用于终端设备更换接入网前终端设备未访问LADN的场景，也可适用于终端设备更换接入网前终端设备访问LADN的场景。
可选的，在步骤S904之前，终端设备中执行S903。
S903：终端设备获知终端设备通过第一会话访问LADN。
在一种可能的实现方式中，SMF网元获知终端设备通过第一会话访问LADN的过程可以参考步骤S501至S505。然后，SMF网元通过AMF网元和RAN设备将用于指示终端设备通过第一 会话访问LADN的指示信息发送至终端设备。
可选的，若SMF网元通过步骤S505确定终端设备通过第一会话访问的数据网络不是LADN，则无需向终端设备发送上述网络名称。在另一种可能的实现方式中，终端设备可以确定第一会话访问的LADN。例如，终端设备在注册流程中，从AMF设备获取LADN对应的网络名称，然后将LADN对应的网络名称和第一会话对应的LADN的网络名称进行匹配。若LADN对应的网络名称包括第一会话对应的LADN的网络名称，或者，LADN对应的网络名称与第一会话对应的LADN的网络名称相同，则终端设备确定第一会话访问LADN。
因此，在步骤S904中，在终端设备通过第一会话访问某个特定LADN时，终端设备可以根据获知的终端设备通过第一会话访问LADN，以及终端设备获得的接入网标识和LADN的网络名称之间的关联，向接入网的标识所对应的支持该特定LADN的non-3GPP接入网设备发送连接请求，从而使终端设备接入该接入网设备后，访问该特定LADN的业务不会被终断，进一步提高了用户体验。
例如，终端设备在S903步骤中获知终端设备通过第一会话访问的LADN的网络名称为DNN1，且终端设备在S902步骤中获取标识为SSID 1和DNN 1之间的关联，且DNN 1对应LADN 1。则终端设备选择并接入支持LADN 1且标识为SSID 1的接入网设备。
因此，通过上述方案，在non-3GPP接入网络的场景下，终端设备通过获知终端设备通过第一会话访问某特定LADN的网络名称，并根据获取的可供接入的候选接入网的标识和LADN的网络名称之间的关联，可以接入到支持该特定LADN的接入网设备。从而使终端设备在接入到该接入网后，该特定LADN的业务不会被终断，提高了用户体验。上述本申请提供的实施例中，分别从各个网元本身、以及从各个网元之间交互的角度对本申请实施例提供的选择无线接入网设备的方法等各方案进行了介绍。可以理解的是，各个网元，例如上述无线接入网设备或通信装置或终端设备等为了实现上述功能，其包含了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，本申请能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
例如，当上述网元通过软件模块来实现相应的功能。无线接入网设备可包括接收模块1001和发送模块1003，如图10A所示。可选的，该无线接入网设备还包括处理模块1002。该无线接入网设备可用于执行上述图3至图8中第一RAN设备的操作。例如：
接收模块1001用于从第二RAN设备接收第二RAN设备的能力信息，该能力信息用于指示RAN设备支持的本地数据网络LADN。发送模块1003用于向第二RAN设备发送切换请求消息。
由此，在终端设备发生移动切换时，上述无线接入网设备会根据获得的相邻的多个RAN设备的能力信息，向支持LADN的第二RAN设备发送切换请求，从而使移动终端接入第二RAN设备后可以访问LADN业务，提高了用户体验。
可选的，所述发送模块1003用于向第二RAN设备发送连接建立请求消息；所述接收模块用于从第二RAN设备接收连接建立响应消息，其中，连接建立响应消息包括第二RAN设备的能力信息。
可选的，在发送模块1003向第二RAN设备发送切换请求消息之前，处理模块1002用于确定终端设备通过第一会话访问LADN。
可选的，上述接收模块1001还用于从会话管理功能SMF网元接收第一会话的会话标识和 LADN的第一网络名称之间的关联；或者，上述接收模块1001还用于从SMF网元接收第二网络名称，上述处理模块1002还用于确定所述第二网络名称对应所述LADN。
由此，在终端设备通过第一会话访问某个特定LADN时，第一RAN设备可以向支持该特定LADN的第二RAN设备发送切换请求，从而使移动终端接入第二RAN设备后，第一会话不会被终断或暂停，使得访问该特定LADN的业务不会被终断或暂停，进一步提高了用户体验。
此外，无线接入网设备中的接收模块1001、处理模块1002和发送模块1003还可实现上述方法中第一RAN设备的其他操作或功能，此处不再赘述。
图10B示出了上述实施例中所涉及的无线接入网设备的另一种可能的结构示意图。无线接入网设备包括收发器1004和处理器1005，如图10B所示。例如，处理器1005被配置为无线接入网设备执行上述方法中第一RAN设备相应的功能。收发器1004用于实现第一RAN设备与接入和移动性管理功能网元/其他无线接入网设备(例如，第二RAN设备)之间的通信。所述无线接入网设备还可以包括存储器1006，所述存储器用于与处理器耦合，其保存无线接入网设备必要的程序指令和数据。
无线接入网设备可包括接收模块1101和发送模块1103，如图11A所示。可选的，该无线接入网设备还包括处理模块1102。该无线接入网设备可用于执行上述图3、图4和图7中第二RAN设备的操作。例如：
接收模块1101用于从AMF网元接收所述无线接入网络设备的能力信息，该能力信息用于指示所述无线接入网络设备支持的本地数据网络LADN。发送模块1103用于向第一RAN设备发送能力信息。
由此，无线接入网络设备将从AMF网元获取的所述无线接入网络设备的能力信息，发送给了第一RAN设备。第一RAN设备获得该能力信息后，可以在为终端设备选择切换目标时，优先将终端设备切换到支持LADN的RAN设备(例如所述第二无线接入网络设备)，使终端设备在切换后能够访问LADN业务，从而提高了用户体验。
可选的，在建立所述无线接入网络设备和所述AMF网元之间的连接过程中，所述接收模块1101用于从AMF网元接收所述无线接入网络设备的能力信息。
可选的，接收模块1101用于从第一RAN设备接收连接建立请求消息；所述发送模块1103用于向第一RAN设备发送连接建立响应消息，其中，该连接建立响应消息包括所述能力信息。
此外，无线接入网设备中的接收模块1101、处理模块1102和发送模块1103还可实现上述方法中第二RAN设备的其他操作或功能，此处不再赘述。
图11B示出了上述实施例中所涉及的无线接入网设备的另一种可能的结构示意图。无线接入网设备包括收发器1104和处理器1105，如图11B所示。例如，处理器1105被配置为无线接入网设备执行上述方法中第二RAN设备相应的功能。收发器1104用于实现第二RAN设备与接入和移动性管理功能网元/其他无线接入网设备(例如，第一RAN设备)之间的通信。所述无线接入网设备还可以包括存储器1106，所述存储器用于与处理器耦合，其保存无线接入网设备必要的程序指令和数据。
通信装置可包括接收模块1201和发送模块1203，如图12A所示。可选的，该通信装置还包括处理模块1202。该通信装置可用于执行上述图4中AMF网元的操作。例如：
接收模块1201用于从RAN设备接收连接建立请求消息。发送模块1203用于向RAN设备发送所述RAN设备的能力信息。其中，能力信息用于指示RAN设备支持的LADN。
由此，上述通信装置完成了与RAN设备的连接建立，并将RAN设备的能力信息发送给RAN设备。该能力信息可用于为终端设备进行切换的场景，此外，该能力信息还适用于其他通信 应用场景。
可选的，上述能力信息包括LADN的数据网络名称DNN、网络协议IP地址或前缀、IP路由信息中的至少一项。由此，RAN设备的能力信息可以用以表示RAN设备支持的LADN。
可选的，上述能力信息包括所述LADN的DNN、IP地址或前缀、IP路由信息中的至少一项与小区标识或跟踪区标识之间的对应关系。
此外，通信装置中的接收模块1201、处理模块1202和发送模块1203还可实现上述方法中AMF的其他操作或功能，此处不再赘述。
图12B示出了上述实施例中所涉及的通信装置的另一种可能的结构示意图。通信装置包括收发器1204和处理器1205，如图12B所示。例如，处理器1205被配置为通信装置执行上述方法中AMF网元相应的功能。收发器1204用于实现AMF网元与终端设备/无线接入网设备/会话管理功能网元之间的通信。所述通信装置还可以包括存储器1206，所述存储器用于与处理器耦合，其保存通信装置必要的程序指令和数据。
通信装置可包括接收模块1301和发送模块1303，如图13A所示。可选的，该通信装置还包括处理模块1302。该通信装置可用于执行上述图5、图6和图8中SMF网元的操作。例如：
接收模块1301用于从终端设备接收第一会话的会话标识和网络名称。发送模块1303用于向无线接入网络RAN设备发送会话管理信息，其中，会话管理信息包括会话标识和网络名称之间的关联。
根据上述方案，第一RAN设备优先选择支持LADN的RAN设备作为切换目标，使得终端设备可以通过目标RAN设备访问LADN，从而提高了用户体验。
可选的，处理模块1302用于确定终端设备通过第一会话访问LADN。根据上述方案，在终端设备通过第一会话访问某个特定LADN时，第一RAN设备可以向支持该特定LADN的第二RAN设备发送切换请求，从而使移动终端接入第二RAN设备后，第一会话不会被终断或暂停，使得访问该特定LADN的业务不会被终断或暂停，进一步提高了用户体验。
可选的，处理模块1302用于预配置与LADN对应的网络名称；或者，接收模块1301用于从AMF网元接收与LADN对应的网络名称；或者，接收模块1301还用于从PCF网元接收与LADN对应的网络名称；或者，接收模块1301还用于从数据管理网元接收与LADN对应的网络名称。
此外，通信装置中的接收模块1301、处理模块1302和发送模块1303还可实现上述方法中SMF的其他操作或功能，此处不再赘述。
图13B示出了上述实施例中所涉及的通信装置的另一种可能的结构示意图。通信装置包括收发器1304和处理器1305，如图13B所示。例如，处理器1305被配置为通信装置执行上述方法中SMF网元相应的功能。收发器1304用于实现SMF网元与终端设备/无线接入网设备/接入和移动性管理功能网元之间的通信。所述通信装置还可以包括存储器1306，所述存储器用于与处理器耦合，其保存通信装置必要的程序指令和数据。
终端设备可包括接收模块1401和发送模块1402，如图14A所示。可选的，该终端设备还包括发送模块1403。该终端设备可用于执行上述图9中终端设备的操作。例如：
接收模块1401用于从接入网发现网元(例如，4G中的接入网络发现和选择功能网元，或者，5G中的PCF网元)接收接入网标识和LADN之间的关联。处理模块1402用于根据接入网标识和LADN之间的关联接入接入网标识对应的接入网。
根据上述方案，当终端设备发生移动需要重新选择non-3GPP接入网时，终端设备会根据获得的接入网标识和LADN的网络名称之间的关联，向接入网的标识所对应的接入网设备发送 接入请求。由于上述接入网的标识所对应的接入网设备支持LADN，所以终端设备在更换接入网后可以访问LADN业务，从而提高了用户体验。
可选的，在终端设备根据接入网标识和LADN之间的关联接入接入网标识对应的接入网之前，处理模块1402用于确定终端设备通过第一会话访问LADN。由此，在non-3GPP接入网络的场景下，终端设备通过获知终端设备通过第一会话访问某特定LADN的网络名称，并根据获取的可供接入的候选接入网的标识和LADN的网络名称之间的关联，可以接入到支持该特定LADN的接入网设备。从而使终端设备更换接入网后，该特定LADN的业务不会被终断，提高了用户体验。
此外，终端设备中的接收模块1401、处理模块1402和发送模块1403还可实现上述方法中终端设备的其他操作或功能，此处不再赘述。
图14B示出了上述实施例中所涉及的终端设备的另一种可能的结构示意图。终端设备包括收发器1404和处理器1405，如图14B所示。例如，处理器1405被配置为终端设备执行上述方法中终端设备相应的功能。收发器1404用于实现终端设备与接入发现网元之间的通信。所述终端设备还可以包括存储器1406，所述存储器用于与处理器耦合，其保存终端设备必要的程序指令和数据。可以理解的是，图10B、图11B、图12B、图13B、图14B仅仅示出了上述设备的简化设计。在实际应用中，上述每个设备可以包含任意数量的发射器，接收器，处理器，控制器，存储器，通信单元等，而所有可以实现本申请的设备都在本申请的保护范围之内。
用于执行本申请上述无线接入网设备的控制器/处理器可以是中央处理器(CPU)，通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)，现场可编程门阵列(FPGA)或者其他可编程逻辑器件、晶体管逻辑器件，硬件部件或者其任意组合。其可以实现或执行结合本申请公开内容所描述的各种示例性的逻辑方框，模块和电路。所述处理器也可以是实现计算功能的组合，例如包含一个或多个微处理器组合，DSP和微处理器的组合等等。
结合本申请公开内容所描述的方法或者算法的步骤可以硬件的方式来实现，也可以是由处理器执行软件指令的方式来实现。软件指令可以由相应的软件模块组成，软件模块可以被存放于RAM存储器、闪存、ROM存储器、EPROM存储器、EEPROM存储器、寄存器、硬盘、移动硬盘、CD-ROM或者本领域熟知的任何其它形式的存储介质中。一种示例性的存储介质耦合至处理器，从而使处理器能够从该存储介质读取信息，且可向该存储介质写入信息。当然，存储介质也可以是处理器的组成部分。处理器和存储介质可以位于ASIC中。另外，该ASIC可以位于无线接入网设备中。当然，处理器和存储介质也可以作为分立组件存在于无线接入网设备中。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本发明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(DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，(例 如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质(例如固态硬盘Solid State Disk(SSD))等。
以上所述的具体实施方式，对本发明的目的、技术方案和有益效果进行了进一步详细说明，所应理解的是，以上所述仅为本发明的具体实施方式而已，并不用于限定本发明的保护范围，凡在本发明的技术方案的基础之上，所做的任何修改、等同替换、改进等，均应包括在本发明的保护范围之内。
以上所述的具体实施方式，对本发明的目的、技术方案和有益效果进行了进一步详细说明，所应理解的是，以上所述仅为本发明的具体实施方式而已，并不用于限定本发明的保护范围，凡在本发明的技术方案的基础之上，所做的任何修改、等同替换、改进等，均应包括在本发明的保护范围之内。

Claims (26)

  1. 一种选择无线接入网RAN设备的方法，其特征在于，包括：
    第一无线接入网络RAN设备获取第二RAN设备的能力信息，所述能力信息用于指示所述第二RAN设备支持的本地数据网络LADN；
    所述第一RAN设备向所述第二RAN设备发送切换请求消息。
  2. 根据权利要求1所述方法，其特征在于，所述第一RAN设备获取第二RAN设备的能力信息，包括：
    所述第一RAN设备向所述第二RAN设备发送连接建立请求消息，从所述第二RAN设备接收连接建立响应消息，其中，所述连接建立响应消息包括所述第二RAN设备的能力信息。
  3. 根据权利要求1或2所述方法，其特征在于，在所述第一RAN设备向所述第二RAN设备发送切换请求消息之前，所述方法还包括：
    所述第一RAN设备确定终端设备通过第一会话访问所述LADN。
  4. 根据权利要求3所述的方法，其特征在于，所述方法还包括：
    所述第一RAN设备从会话管理功能SMF网元接收所述第一会话的会话标识和所述LADN的第一网络名称之间的关联；
    或者，
    所述第一RAN设备从SMF网元接收第二网络名称，确定所述第二网络名称对应所述LADN。
  5. 一种通信方法，其特征在于，包括：
    第二无线接入网络RAN设备从接入及移动性管理功能AMF网元获取所述第二RAN设备的能力信息，所述能力信息用于指示所述第二RAN设备支持的本地数据网络LADN；
    所述第二RAN设备向第一RAN设备发送所述能力信息。
  6. 根据权利要求5所述方法，其特征在于，所述第二RAN设备从所述AMF网元获取所述第二RAN设备的能力信息，包括：
    所述第二RAN设备在建立所述第二RAN和所述AMF网元之间的连接过程中，从所述AMF网元获取所述第二RAN设备的能力信息。
  7. 根据权利要求5或6所述方法，其特征在于，所述第二RAN设备向第一RAN设备发送所述能力信息，包括：
    所述第二RAN设备从第一RAN设备接收连接建立请求消息，向所述第一RAN设备发送连接建立响应消息，其中，所述连接建立响应消息包括所述能力信息。
  8. 一种通信方法，其特征在于，包括：
    移动性管理功能AMF网元从无线接入网络RAN设备接收连接建立请求消息；
    所述AMF网元向所述RAN设备发送所述RAN设备的能力信息，所述能力信息用于指示所述RAN设备支持的本地数据网络LADN。
  9. 根据权利要求1至8中任一项所述方法，其特征在于，所述能力信息包括所述LADN的数据网络名称DNN、网络协议IP地址或前缀、IP路由信息中的至少一项。
  10. 根据权利要求1至8中任一项所述的方法，其特征在于，所述能力信息包括所述LADN的DNN、IP地址或前缀、IP路由信息中的至少一项与小区标识或跟踪区标识之间的对应关系。
  11. 一种通信方法，其特征在于，包括：
    会话管理功能SMF网元从终端设备接收第一会话的会话标识和网络名称；
    所述SMF网元向无线接入网络RAN设备发送会话管理信息，所述会话管理信息包括所述会话标识和所述网络名称之间的关联。
  12. 根据权利要求11所述方法，其特征在于，还包括：
    所述SMF网元确定所述终端设备通过所述第一会话访问本地数据网络LADN。
  13. 根据权利要求12所述方法，其特征在于，
    所述SMF网元内预配置有与所述LADN对应的所述网络名称，或者，
    所述方法还包括：
    所述SMF从接入及移动性管理功能AMF网元获取与所述LADN对应的所述网络名称；或者，所述SMF网元从策略控制功能PCF网元获取与所述LADN对应的所述网络名称；或者，所述SMF网元从数据管理网元获取与所述LADN对应的所述网络名称。
  14. 一种第一无线接入网络设备，其特征在于，包括：
    接收模块，用于从第二无线接入网络RAN设备接收所述第二RAN设备的能力信息，所述能力信息用于指示所述第二RAN设备支持的本地数据网络LADN；
    发送模块，用于向所述第二RAN设备发送切换请求消息。
  15. 根据权利要求14所述的第一无线接入网络设备，其特征在于，所述发送模块还用于向所述第二RAN设备发送连接建立请求消息；所述接收模块还用于从所述第二RAN设备接收连接建立响应消息，其中，所述连接建立响应消息包括所述第二RAN设备的能力信息。
  16. 根据权利要求14或15所述的第一无线接入网络设备，其特征在于，所述无线接入网络设备还包括：
    处理模块，用于确定终端设备通过第一会话访问所述LADN。
  17. 根据权利要求16所述的第一无线接入网络设备，其特征在于，包括：
    所述接收模块还用于从会话管理功能SMF网元接收所述第一会话的会话标识和所述LADN的第一网络名称之间的关联；
    或者，
    所述接收模块还用于从所述SMF网元接收第二网络名称，所述处理模块还用于确定所述第二网络名称对应所述LADN。
  18. 一种第二无线接入网络设备，其特征在于，包括：
    接收模块，用于从接入及移动性管理功能AMF网元接收所述第二无线接入网络设备的能力信息，所述能力信息用于指示所述无线接入网络设备支持的本地数据网络LADN；
    发送模块，用于向第一无线接入网络设备发送所述能力信息。
  19. 根据权利要求18所述第二无线接入网络设备，其特征在于，所述接收模块还用于在建立所述第二无线接入网络设备和所述AMF网元之间的连接过程中，从所述AMF网元接收所述第二无线接入网络设备的能力信息。
  20. 根据权利要求18或19所述第二无线接入网络设备，其特征在于，所述接收模块还用于从所述第一无线接入网络设备接收连接建立请求消息；所述发送模块还用于向所述第一无线接入网络设备发送连接建立响应消息，其中，所述连接建立响应消息包括所述能力信息。
  21. 一种通信装置，其特征在于，包括：
    接收模块，用于从无线接入网络RAN设备接收连接建立请求消息；
    发送模块，用于向所述RAN设备发送所述RAN设备的能力信息，所述能力信息用于指示所述RAN设备支持的本地数据网络LADN。
  22. 根据权利要求14至17中任一项所述第一无线接入网络设备、权利要求18至20中任 一项所述第二无线接入网设备、或权利要求21所述的通信装置，其特征在于，所述能力信息包括所述LADN的数据网络名称DNN、网络协议IP地址或前缀、IP路由信息中的至少一项。
  23. 根据权利要求14至17中任一项所述第一无线接入网络设备、权利要求18至20中任一项所述第二无线接入网设备、或权利要求21所述的通信装置，其特征在于，所述能力信息包括所述LADN的DNN、IP地址或前缀、IP路由信息中的至少一项与小区标识或跟踪区标识之间的对应关系。
  24. 一种通信装置，其特征在于，包括：
    接收模块，用于从终端设备接收第一会话的会话标识和网络名称；
    发送模块，用于向无线接入网络RAN设备发送会话管理信息，所述会话管理信息包括所述会话标识和所述网络名称之间的关联。
  25. 根据权利要求24所述的通信装置，其特征在于，还包括：
    处理模块，用于确定所述终端设备通过所述第一会话访问本地数据网络LADN。
  26. 根据权利要求25所述的通信装置，其特征在于，
    所述处理模块还用于预配置与所述LADN对应的所述网络名称，或者，
    所述接收模块还用于从接入及移动性管理功能AMF网元接收与所述LADN对应的所述网络名称；或者，所述接收模块还用于从策略控制功能PCF网元接收与所述LADN对应的所述网络名称；或者，所述接收模块还用于从数据管理网元接收与所述LADN对应的所述网络名称。
PCT/CN2018/088917 2017-08-21 2018-05-30 一种选择无线接入网设备的方法及装置 Ceased WO2019037500A1 (zh)

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