WO2018145670A1 - 基站的切换方法、系统和存储介质 - Google Patents

基站的切换方法、系统和存储介质 Download PDF

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Publication number
WO2018145670A1
WO2018145670A1 PCT/CN2018/080066 CN2018080066W WO2018145670A1 WO 2018145670 A1 WO2018145670 A1 WO 2018145670A1 CN 2018080066 W CN2018080066 W CN 2018080066W WO 2018145670 A1 WO2018145670 A1 WO 2018145670A1
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WIPO (PCT)
Prior art keywords
amf
handover
user equipment
smf
base station
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PCT/CN2018/080066
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English (en)
French (fr)
Inventor
李振东
朱进国
梁爽
周晓云
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中兴通讯股份有限公司
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Priority to US16/484,411 priority Critical patent/US11297542B2/en
Publication of WO2018145670A1 publication Critical patent/WO2018145670A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • 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
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/12—Setup of transport tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08—Mobility data transfer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/08—Upper layer protocols
    • H04W80/10—Upper layer protocols adapted for application session management, e.g. SIP [Session Initiation Protocol]
    • 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
    • H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers

Definitions

  • the present disclosure relates to the field of communications, and in particular to a handover method, system, and storage medium for a base station.
  • next generation communication network architecture shows the next generation mobile communication network architecture, in which the functions of each network element are as follows:
  • the user equipment accesses the network through the next-generation wireless air interface and obtains services.
  • the terminal exchanges information through the air interface and the base station, and uses the non-access layer signaling and the common control plane function of the core network and session control. Face function interaction information.
  • the next-generation base station which may also be called a next-generation (NG) Radio Access Network (RAN), that is, an NR base station, is responsible for air interface resource scheduling of the terminal access network and connection management of air interfaces.
  • NG next-generation
  • RAN Radio Access Network
  • the Session Management Function which is the session management function, is configured to interact with the terminal. It is mainly responsible for handling session establishment, modification, and deletion requests of the User Data Unit (PDU), and selecting the user plane function.
  • PDU User Data Unit
  • UPF User Plane function
  • PCF Policy Control Function
  • Access and Mobility Control Function also known as access and mobility management functions, is a common control plane function within the core network.
  • AMF Access and Mobility Control Function
  • AMF Access and Mobility Management Function
  • AMF Access and Mobility Management Function
  • UPF provides user plane processing functions, including data forwarding and QoS execution. UPF also provides user plane anchors when users move to ensure business continuity.
  • the PCF provides the SMF with a QoS rule related to the user's quality of service.
  • the subscription data management function stores the user's subscription data.
  • interfaces between the two network elements in FIG. 1 are the interfaces for communication between the two connected network elements.
  • Step S201 in the PDU session establishment process, the UE and the network establish a PDU session (ie, a PDU session), and there is a service.
  • a PDU session ie, a PDU session
  • the base station 1 determines that the base station handover needs to be initiated, and determines the handover target base station 2 (RAN2) according to the measurement report of the UE.
  • the base station 1 determines that there is no direct interface with the destination base station 2, and initiates a handover request to the AMF.
  • the message carries the destination base station information and current session information, and the session information includes PDU session information, including the PDU session identifier.
  • Step S203 Perform handover preparation, and the AMF initiates a handover request message to the target base station 2 according to the destination base station information, where the message includes current session information, and the current session information includes PDU session information, including PDU session identifier and QoS information (whether or not the N3 is included). Upstream tunnel identification).
  • Step S204 The handover preparation response, the destination base station 2 reserves radio resources according to the PDU session information, and returns a handover request response message with reserved radio resource information.
  • the message also carries the N3 tunnel downlink tunnel identifier assigned by the destination base station 2 for each PDU session in which the reserved resource is successful.
  • Step S205 The AMF determines, if the resource reservation of the PDU session is successful, returns a handover request response message to the base station 1 with the radio resource information reserved by the destination base station 2 for the PDU sessions.
  • Step S206 the base station 1 initiates a handover command to the UE, with the radio resource information reserved by the base station 2.
  • Step S207 The user access request, the terminal accesses the base station 2 according to the radio resource information reserved by the target base station 2.
  • Step S208 the handover is completed, and the destination base station 2 initiates a completion message to the AMF.
  • Step S209 the AMF initiates a PDU session update request to the SMF, with the N3 tunnel downlink tunnel identifier assigned by the destination base station 2 for each session.
  • Step S210 the SMF and the UPF interactively update the N3 tunnel downlink tunnel identifier, and then return a path switch response, that is, a PDU session update response, to the AMF.
  • step S211 the AMF sends an N2 connection release request to the base station 1 (the source base station).
  • Step S212 If the base station cell is not in the TA list of the UE (the TA is referred to as a Tracking Area, and the TA is a newly established concept list of the LTE system and the location management of the UE), the location update process is triggered.
  • the TA is referred to as a Tracking Area
  • the TA is a newly established concept list of the LTE system and the location management of the UE
  • the AMF is a network element responsible for mobility, which does not save session information, so in step S203, the AMF needs to obtain session information of the user equipment.
  • the AMF is related to the location of the UE, and each UE has only one AMF serving it. As the UE moves, it may move out of the AMF service area. At this point, it will cause the AMF to change, and the AMF change may also cause the SMF to change. There is currently no technology for how to reserve resources on the target side under these circumstances.
  • Embodiments of the present disclosure provide a handover method, system, and storage medium for a base station.
  • a handover method of a base station including: a first AMF receiving handover request information sent by a first base station, where handover request information is used to request to switch a user equipment from a first base station to a first base station a second base station; in a case that the user equipment does not need to perform the cross-AMF handover, the first AMF sends a handover preparation request to the second base station, and requests the target resource for the user equipment, where the handover preparation request carries the handover request information and the user equipment Session information, the AMF of the user equipment is changed from the first AMF to the second AMF during the AMF handover process; in the case that the user equipment needs to perform the cross AMF handover, the first AMF sends the handover request information to the second AMF, by the second The AMF sends a handover preparation request to the second base station to request the target resource for the user equipment.
  • the method before the first AMF sends the handover preparation request to the second base station, the method further includes: the first AMF acquiring the session information of the user equipment from the first SMF.
  • the acquiring, by the first AMF, the session information of the user equipment from the first SMF includes: when the user equipment has multiple sessions, the first AMF acquires the session of each session from the first SMF corresponding to each session respectively. information.
  • the method before the second AMF sends the handover preparation request to the second base station, the method further includes: when the connection with the first SMF can be established, the second AMF acquires the session information of the user equipment from the first SMF; In the case that the connection with the first SMF cannot be established, the second AMF acquires the session information of the user equipment through the second SMF, where the second SMF is the SMF allocated by the second AMF to the user equipment.
  • the acquiring, by the second AMF, the session information of the user equipment by using the second SMF includes: after allocating the second SMF for the user equipment, the second AMF sends a handover preparation request to the second SMF, to indicate that the second SMF is from the second An SMF acquires session information of the user equipment; the second AMF receives session information of the user equipment returned by the second SMF.
  • the sending, by the first AMF, the handover request information to the second AMF includes: the first AMF transmitting the handover request information and the address information of the first SMF to the second AMF.
  • the method before the second AMF sends the handover preparation request to the second base station, the method further includes: determining, by the second AMF, whether an address matching the address information of the first SMF exists in the preset address set, where the preset address The address in the set is an address that allows the second AMF connection; wherein, in the case that it is determined that there is an address matching the address information of the first SMF in the preset address set, it is determined that the second AMF can establish a connection with the first SMF. If it is determined that there is no address matching the address information of the first SMF in the preset address set, it is determined that the second AMF cannot establish a connection with the first SMF.
  • the method further includes: when receiving the response message for the handover request information, the first base station sends a handover command carrying the indication information of the target resource to the user equipment; wherein the user equipment follows the indication of the handover command Switch to the second base station and carry the session through the target resource.
  • the session information includes the QoS information of the session.
  • a handover system of a base station includes: a first AMF configured to receive handover request information sent by a first base station, where handover request information is used to request a user equipment Switching from the first base station to the second base station; the first AMF is further configured to: when the user equipment does not need to perform the cross-AMF handover, send the handover preparation request to the second base station, and request the target resource for the user equipment, where the handover preparation request Carrying the handover request information and the session information of the user equipment, the AMF of the user equipment is changed from the first AMF to the second AMF during the AMF handover process; and the second AMF is configured to receive when the user equipment needs to perform the cross AMF handover.
  • the first AMF is further configured to acquire session information of the user equipment from the first SMF.
  • the first AMF is further configured to acquire session information of each session from the first SMF corresponding to each session, respectively, if the user equipment has multiple sessions.
  • the second AMF includes: a first acquiring module, configured to acquire session information of the user equipment from the first SMF when the connection with the first SMF can be established; and the second acquiring module is configured to be unable to In the case of establishing a connection with the first SMF, the session information of the user equipment is acquired by the second SMF, wherein the second SMF is the SMF allocated by the second AMF to the user equipment.
  • the second obtaining module includes: a sending submodule, configured to send a handover preparation request to the second SMF after the second SMF is allocated for the user equipment, to instruct the second SMF to acquire the user equipment from the first SMF.
  • the session information is configured to receive the session information of the user equipment returned by the second SMF.
  • the first AMF is further configured to send the handover request information and the address information of the first SMF to the second AMF.
  • the session information includes the QoS information of the session.
  • a handover method of a base station including: a first access and mobility management function AMF receives handover request information sent by a first base station, where the handover request information is used for a request Switching the user equipment from the first base station to the second base station; if the user equipment does not need to perform cross-AMF handover, the first AMF sends a handover preparation request to the second base station, The user equipment requests the target resource, where the handover preparation request carries the handover request information and the session information of the user equipment, where the AMF of the user equipment is changed from the first AMF to a second AMF; in a case that the user equipment needs to perform cross-AMF handover, the first AMF sends handover request information to the second AMF, and the handover request information is used by the second AMF transmission station.
  • the handover preparation request is sent to the second base station, and the target resource is requested by the user equipment.
  • the method before the first AMF sends a handover preparation request to the second base station, the method further includes:
  • the first AMF acquires session information of the user equipment from the first SMF.
  • the acquiring, by the first AMF, the session information of the user equipment from the first SMF includes:
  • the first AMF acquires session information of each of the sessions from the first SMF corresponding to each of the sessions, respectively.
  • the sending, by the first AMF, the handover request information to the second AMF includes:
  • the first AMF sends the handover request information and address information of the first SMF to the second AMF.
  • a method for handover of a base station including:
  • the second AMF receives the handover request information sent by the first AMF; the received handover request information is sent after the first AMF receives the handover request information sent by the first base station, and the user equipment needs to perform the cross AMF handover.
  • the switching request information received by the first AMF is used to request to switch the user equipment from the first base station to the second base station; the AMF of the user equipment is changed from the first AMF to Second AMF;
  • the second AMF sends a handover preparation request to the second base station, and requests the target resource for the user equipment.
  • the method before the second AMF sends a handover preparation request to the second base station, the method further includes:
  • the second AMF acquires session information of the user equipment from the first SMF, in a case that a connection with the first SMF can be established;
  • the second AMF acquires session information of the user equipment by using a second SMF, where the second SMF is the second AMF is The SMF assigned by the user device.
  • the acquiring, by the second AMF, the session information of the user equipment by using the second SMF includes:
  • the second AMF After allocating the second SMF to the user equipment, the second AMF sends a handover preparation request to the second SMF to instruct the second SMF to acquire the user equipment from the first SMF. Session information;
  • the second AMF receives session information of the user equipment returned by the second SMF.
  • the method when the second AMF receives the handover request information sent by the first AMF, the method further includes:
  • the second AMF receives address information of the first SMF sent by the first AMF.
  • a storage medium which may be configured to store program code for performing the following steps: receiving handover request information transmitted by a first base station, wherein handover request information is used for request Switching the user equipment from the first base station to the second base station; if the user equipment does not need to perform the cross-AMF handover, sending the handover preparation request to the second base station, requesting the target resource for the user equipment, where the handover preparation request carries the handover Request information and session information of the user equipment, the cross-AMF switch is used to indicate that the AMF of the user equipment is changed from the first AMF to the second AMF; and when the user equipment needs to perform the cross-AMF handover, the handover request information is sent to the second AMF. And transmitting, by the second AMF, a handover preparation request to the second base station, requesting the target resource for the user equipment.
  • a storage medium having stored thereon a computer program that, when executed, implements the steps of any of the methods of the first AMF side described above.
  • a storage medium having stored thereon a computer program that, when executed, implements the steps of any of the methods of the second AMF side described above.
  • the first AMF receives the handover request information sent by the first base station, where the handover request information is used to request to switch the user equipment from the first base station to the second base station; and the user equipment does not need to perform the cross-AMF handover.
  • the first AMF sends a handover preparation request to the second base station, and requests a target resource for the user equipment, where the handover preparation request carries the handover request information and the session information of the user equipment, and the AMF of the user equipment is first by the AMF handover process.
  • the AMF is changed to the second AMF; in the case that the user equipment needs to perform the cross-AMF handover, the first AMF sends the handover request information to the second AMF, and the second AMF sends the handover preparation request to the second base station to request the target for the user equipment.
  • the resource enables the target base station side to reserve the target resource for the user equipment, thereby solving the technical problem that the target side cannot reserve resources for the user terminal in the related art, and realizes the technical effect of reserving the target resource for the user equipment on the target base station side.
  • FIG. 1 is a schematic diagram of a mobile communication network architecture in the related art
  • FIG. 3 is a flowchart of an alternative method of handover of a base station according to an embodiment of the present disclosure
  • FIG. 4 is a flowchart of an alternative method of handover of a base station according to an embodiment of the present disclosure
  • FIG. 5 is a flowchart of an alternative method of handover of a base station according to an embodiment of the present disclosure
  • FIG. 6 is a flowchart of an alternative method of handover of a base station according to an embodiment of the present disclosure
  • FIG. 7 is a flowchart of an alternative method of handover of a base station according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic diagram of a handover system of a base station according to an embodiment of the present disclosure.
  • a method embodiment of a method of handover of a base station is provided, it being noted that the steps illustrated in the flowchart of the figures may be performed in a computer system such as a set of computer executable instructions, and Although the logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in a different order than the ones described herein.
  • FIG. 3 is a flowchart of a method for switching an optional base station according to an embodiment of the present disclosure. As shown in FIG. 3, the method includes the following steps:
  • Step S301 The first AMF receives the handover request information sent by the first base station, where the handover request information is used to request to switch the user equipment from the first base station to the second base station.
  • Step S302 If the user equipment does not need to perform the cross-AMF handover, the first AMF sends a handover preparation request to the second base station, and requests the target resource for the user equipment, where the handover preparation request carries the handover request information and the session information of the user equipment.
  • the AMF of the user equipment changes from the first AMF to the second AMF during the AMF handover.
  • Step S303 in the case that the user equipment needs to perform the cross-AMF handover, the first AMF sends the handover request information to the second AMF, and the second AMF sends the handover preparation request to the second base station to request the target resource for the user equipment.
  • the first AMF receives the handover request information sent by the first base station, where the handover request information is used to request to switch the user equipment from the first base station to the second base station; in the case that the user equipment does not need to perform the cross AMF handover, The first AMF sends a handover preparation request to the second base station to request the target resource for the user equipment, and the handover preparation request carries the handover request information and the session information of the user equipment, and the AMF of the user equipment is changed from the first AMF to the first during the AMF handover process.
  • the first AMF sends the handover request information to the second AMF
  • the second AMF sends the handover preparation request to the second base station to request the target resource for the user equipment, so that the target The base station side can reserve the target resource for the user equipment, thereby solving the technical problem that the target side cannot reserve resources for the user terminal in the related art, and realizes the technical effect of reserving the target resource for the user equipment on the target base station side.
  • the first AMF acquires the session information of the user equipment from the first SMF.
  • the acquiring, by the first AMF, the session information of the user equipment from the first SMF includes: in a case that the user equipment has multiple sessions, the first AMF acquires each session from the first SMF corresponding to each session respectively. Session information.
  • the second AMF before the second AMF sends the handover preparation request to the second base station, in a case where the connection with the first SMF can be established, the second AMF acquires the session information of the user equipment from the first SMF; In the case that the connection with the first SMF cannot be established, the second AMF acquires the session information of the user equipment through the second SMF, where the second SMF is the SMF allocated by the second AMF to the user equipment.
  • the acquiring, by the second AMF, the session information of the user equipment by using the second SMF includes: after allocating the second SMF for the user equipment, the second AMF sends a handover preparation request to the second SMF to indicate the second SMF.
  • the session information of the user equipment is obtained from the first SMF; the second AMF receives the session information of the user equipment returned by the second SMF.
  • the first AMF sends the handover request information to the second AMF, where the first AMF sends the handover request information and the address information of the first SMF to the second AMF.
  • the second AMF determines whether there is an address in the preset address set that matches the address information of the first SMF, where the address in the preset address set is Allowing the address of the second AMF connection; wherein, in the case that it is determined that there is an address matching the address information of the first SMF in the preset address set, determining that the second AMF can establish a connection with the first SMF, determining the pre- In the case where there is no address matching the address information of the first SMF in the address set, it is determined that the second AMF cannot establish a connection with the first SMF.
  • the first base station when receiving the response message for the handover request information, sends a handover command carrying the indication information of the target resource to the user equipment, where the user equipment switches to the second base station according to the indication of the handover command. And host the session through the target resource.
  • the AMF After the AMF receives the handover request, if no cross-AMF handover occurs, the AMF needs to acquire session information from the SMF, and then requests resources from the target base station. If the source AMF (ie, the first AMF) finds that a cross-AMF handover is required, the source AMF sends the SMF's address and the handover request to the target AMF (ie, the second AMF). After the target AMF receives the handover request (the address carrying the SMF), if it can connect to the source SMF, the AMF queries the source SMF for QoS information and requests the target NR base station; otherwise, the target AMF allocates a new SMF and forwards the request. .
  • the source AMF ie, the first AMF
  • the target AMF After the target AMF receives the handover request (the address carrying the SMF), if it can connect to the source SMF, the AMF queries the source SMF for QoS information and requests the target NR base station; otherwise, the
  • the target SMF requests the QoS information from the source SMF, and after receiving the information of the source SMF, requests the resource from the target base station and returns the information to the AMF, thereby solving the technical problem that the target side cannot reserve resources for the user terminal in the related art.
  • SMF1/UPF1 serves the first PDU session
  • SMF2/PDU2 serves the SMF2/PDU2 service. among them,
  • the UE attaches to the NextGen system and establishes 2 PDU sessions. And each PDU session has uplink/downlink traffic.
  • the cross-base station handover process includes:
  • step S401 the base station 1 (NG RAN1) determines that the base station handover needs to be initiated, and determines the handover target base station 2 (NG RAN2) according to the measurement report of the UE.
  • the base station 1 determines that there is no NX2 interface between the destination base station 2 and initiates a handover request to the AMF.
  • the message carries the destination base station information and the current session information, and the session information includes the PDU session information.
  • Step S402 the AMF requests the QoS information of the PDU session 1 from the SMF1/UPF1 according to the PDU session 1 information; the QoS information of the session session 1 includes the QoS parameter of the session 1 and the N3 uplink tunnel information of the PDU session 1.
  • step S403 the SMF1/UPF1 returns the session information of the session 1.
  • Step S404 the AMF requests the QoS information of the PDU session 2 from the SMF2/UPF2 according to the information of the PDU session 2; the QoS information of the session 2 includes the QoS information of the PDU session 2 and the N3 uplink tunnel information of the PDU session 2.
  • step S405 SMF2/UPF2 returns the session information of session 2.
  • Step S406 the AMF requests resource reservation (ie, sends a handover preparation request) to the target base station, that is, the base station 2.
  • resource reservation ie, sends a handover preparation request
  • Step S407 the base station 2 reserves radio resources according to the PDU session information, and returns a handover request response message with reserved radio resource information.
  • the message also carries the N3 tunnel downlink tunnel identifier assigned by the destination base station 2 for each PDU session in which the reserved resource is successful.
  • Step S408 the AMF returns a handover request response message (including a handover command) to the base station 1 with the radio resource information reserved by the destination base station 2 for these PDU sessions.
  • Step S409 the base station 1 initiates a handover command to the UE, with the radio resource information reserved by the base station 2.
  • Step S410 the UE accesses the target base station.
  • step S411 the base station 2 initiates a handover notification message to the AMF.
  • Step S412 the AMF initiates a handover notification to the SMF1, with the N3 tunnel downlink tunnel identifier assigned by the destination base station 2 to the PDU session 1.
  • SMF1 and UPF1 interactively update the N3 tunnel downlink tunnel identity and then return a path switch response to the AMF.
  • Step S413 the AMF initiates a handover notification to the SMF2, with the N3 tunnel downlink tunnel identifier allocated by the target base station 2 for the PDU session 2.
  • SMF2 and UPF2 interactively update the N3 tunnel downlink tunnel identity and then return a path switch response to the AMF.
  • Step S414 the AMF sends an N2 connection release request to the source base station 1, releasing the N2 interface.
  • 5 is a flow diagram of cross-AMF switching, but maintaining the same SMF, in an embodiment of the present disclosure.
  • the UE attaches to the NextGen system and establishes a PDU session. And PDU session has uplink/downstream traffic. When multiple PDU sessions are established, the principle is similar to that of FIG.
  • the flow of the handover method of the base station shown in FIG. 5 includes:
  • step S501 the base station 1 determines that it is necessary to initiate a handover based, and determines the target base station 2 to be switched according to the measurement report of the UE.
  • the base station 1 determines that there is no NX2 interface between the destination base station 2 and the sAMF (ie, the source AMF and the first AMF), and the message carries the destination base station information and the current session information, and the session information includes the PDU session information.
  • Step S502 the sAMF (ie, the source AMF) selects the destination tAMF (ie, the destination AMF, that is, the second AMF in the embodiment of the present invention) according to the destination base station information, and then initiates a handover preparation request to the tAMF, where the message carries the destination base station information and Current session information, current session information includes sSMF address, PDU session information.
  • the destination tAMF ie, the destination AMF, that is, the second AMF in the embodiment of the present invention
  • Step S503 the tAMF sends the information of the handover request PDU session to the sSMF according to the sSMF information.
  • Step S504 the sSMF returns information of the PDU session, including information such as QoS.
  • Step S505 the tAMF requests resource reservation (such as sending a handover preparation request) to the target base station 2 (NG RAN2) according to the information of the session.
  • resource reservation such as sending a handover preparation request
  • Step S506 the base station 2 reserves radio resources according to the PDU session information, and returns a handover preparation response message with reserved radio resource information.
  • the message also carries the destination base station 2 to assign an N3 tunnel downlink tunnel identifier to each PDU session for which the reserved resource is successful.
  • Step S507 the tAMF returns a handover preparation response to the sAMF, where the message carries the radio resource information reserved by the destination base station for the PDU session.
  • Step S508 the sAMF determines that if the resource reservation of the PDU session is successful, the handover request response message (carrying the handover command) is returned to the base station 1 with the radio resource information reserved by the destination base station 2 for the PDU sessions.
  • Step S509 the base station 1 initiates a handover command to the UE, with the radio resource information reserved by the base station 2.
  • Step S510 the terminal accesses the base station 2 according to the radio resource information reserved by the base station 2.
  • step S511 the base station 2 initiates a handover notification message to the tAMF.
  • Step S512 the tAMF initiates a handover notification to the SMF, with the N3 tunnel downlink tunnel identifier assigned by the destination base station 2 for each session.
  • the SMF and the UPF interactively update the N3 tunnel downlink tunnel identity and then return a path switch response to the tAMF.
  • step S513 the tAMF returns a handover complete message to the sAMF.
  • step S514 the sAMF sends an N2 connection release request to the source base station 1.
  • FIG. 6 is a flow diagram of cross-AMF switching while changing the SMF in an embodiment of the present disclosure.
  • the UE attaches to the NextGen system and establishes a PDU session. And PDU session has uplink/downstream traffic. When multiple PDU sessions are established, the principle is similar to that of FIG.
  • the flow of the handover method of the base station shown in FIG. 6 includes:
  • Step S601 the base station 1 (NG RAN1) determines that it is necessary to initiate a handover based, and determines the handover target base station 2 (NG RAN2) according to the measurement report of the UE.
  • the base station 1 determines that there is no NX2 interface between the destination base station 2 and the sAMF to initiate a handover request.
  • the message carries the destination base station information and the current session information, and the session information includes the PDU session information.
  • Step S602 the sAMF (ie, the source AMF, that is, the first AMF in the embodiment of the present invention) selects the destination tAMF (ie, the destination AMF, that is, the second AMF in the embodiment of the present invention) according to the destination base station information, and then initiates to the tAMF.
  • the handover preparation request has a destination base station information and current session information, and the current session information includes an sSMF address and a PDU session information.
  • Step S603 the tAMF finds that the sSMF cannot be connected, allocates a new tSMF to the PDU session, and forwards the handover preparation request to the tSMF.
  • tSMF selects UPF2 to establish an N4 interface.
  • the UPF2 allocates the downlink N9 tunnel identifier, and the uplink N3 tunnel identifier is returned to the tSMF.
  • Step S605 the tSMF requests the PDU session information from the sSMF according to the sSMF information, and carries the downlink N9 tunnel identifier.
  • Step S606 the sSMF returns the QoS information of the PDU session, and the N9 uplink tunnel identifier.
  • Step S607 the tSMF returns a handover response to the tAMF, and includes QoS information of the PDU session.
  • Step S608 the tAMF requests resource reservation (ie, sends a handover preparation request) to the target base station 2.
  • Step S609 the base station 2 reserves radio resources according to the PDU session information, and returns a handover preparation response message with reserved radio resource information.
  • the message also carries the N3 tunnel downlink tunnel identifier assigned by the destination base station 2 for each PDU session in which the reserved resource is successful.
  • Step S610 the tAMF returns a handover preparation response to the sAMF, where the message carries the radio resource information reserved by the target base station 2 for the PDU session.
  • Step S611 the sAMF determines that if the resource reservation of the PDU session is successful, the handover request response message (carrying the handover command) is returned to the base station 1 with the radio resource information reserved by the destination base station 2 for the PDU sessions.
  • Step S612 the base station 1 initiates a handover command to the UE, with the radio resource information reserved by the base station 2.
  • step S613 the terminal accesses the base station 2 according to the radio resource information reserved by the base station 2.
  • Step S614 the base station 2 initiates a handover notification message to the tAMF, prompting that the handover is completed.
  • step S615 the tAMF initiates a handover notification to the tSMF, with the N3 tunnel downlink tunnel identifier assigned by the destination base station 2 for each PDU session, indicating that the handover is completed.
  • step S616 the tSMF sends a handover completion to the sSMF, indicating that the handover is completed.
  • step S617 the sSMF updates its controlled UPF user plane, and then the downlink data is forwarded to the UPF2.
  • Step S618 Perform session update, and tSMF and UPF2 interactively update the N3 tunnel downlink tunnel identifier and the N9 uplink tunnel identifier.
  • step S619 the tAMF returns a handover complete message to the sAMF, indicating that the handover is completed.
  • Step S620 the sAMF sends an N2 connection release request to the source base station 1.
  • FIG. 7 is a flow diagram of cross-AMF switching while changing the SMF, but the UPF does not change, in an embodiment of the present disclosure. Most of the steps of this embodiment are the same as those of FIG. 6, and only different steps are described here for explanation.
  • the UE attaches to the NextGen system and establishes a PDU session. And PDU session has uplink/downstream traffic.
  • Steps S701 to S703 are the same as steps S601 to S603.
  • Step S704 after the tSMF finds that the UPF can be controlled, the new UPF is no longer allocated, and the tSMF requests the session information from the sSMF.
  • Step S705 the sSMF returns QoS information (ie, session information) of the PDU session, which includes UPF information.
  • QoS information ie, session information
  • step S706 the tSMF and the UPF establish an N4 interface, and the UPF2 allocates a downlink N9 tunnel identifier, and the uplink N3 tunnel identifier is returned to the tSMF.
  • Steps S707 to S715 are the same as steps S607 to S615.
  • step S716 the tSMF sends the handover completion information to the sSMF.
  • step S717 the sSMF can release the N4 interface between it and the UPF.
  • Steps S719 and S720 are the same as steps S619 and S620.
  • the UPF may also actively release the N4 interface between the sSMF and the sSMF.
  • the AMF can obtain the required session information, and the AMF is related to the location of the UE, and each UE has only one AMF serving it. As the UE moves, it may move out of the AMF service area. At this point, the AMF changes, and the AMF changes may also cause changes in the SMF. In these cases, the application may also reserve resources on the target side.
  • a handover system of a base station is also provided in the embodiment of the present disclosure.
  • the system is configured to implement the foregoing embodiments and specific implementation manners, and details have been omitted for description.
  • the term "module" may implement a combination of software and/or hardware of a predetermined function.
  • the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.
  • FIG. 8 is a schematic diagram of a handover system of a base station according to an embodiment of the present disclosure. As shown in FIG. 8, the system can include: a first AMF and a second AMF.
  • the first AMF is configured to receive the handover request information sent by the first base station, where the handover request information is used to request to switch the user equipment from the first base station to the second base station;
  • the first AMF is further configured to: when the user equipment does not need to perform the cross-AMF handover, send the handover preparation request to the second base station, and request the target resource for the user equipment, where the handover preparation request carries the handover request information and the session of the user equipment. Information, the AMF of the user equipment is changed from the first AMF to the second AMF during the AMF handover process;
  • the second AMF is configured to receive the handover request information sent by the first AMF when the user equipment needs to perform the cross-AMF handover, and send the handover preparation request to the second base station to request the target resource for the user equipment.
  • the first AMF receives the handover request information sent by the first base station, where the handover request information is used to request to switch the user equipment from the first base station to the second base station; the first AMF does not need to perform cross-AMF handover on the user equipment. If the handover preparation request is sent to the second base station to request the target resource for the user equipment, the handover preparation request carries the handover request information and the session information of the user equipment, and the AMF of the user equipment is changed from the first AMF to the AMF during the AMF handover procedure.
  • the second AMF in the case that the user equipment needs to perform the cross-AMF handover, receives the handover request information sent by the first AMF, and sends a handover preparation request to the second base station to request the target resource for the user equipment, so that the target base station side
  • the target resource can be reserved for the user equipment, and the technical problem that the target side cannot reserve resources for the user terminal in the related art is solved, and the technical effect of reserving the target resource for the user equipment on the target base station side is realized.
  • the first AMF is further configured to acquire session information of the user equipment from the first session management function module first SMF.
  • the first AMF is further configured to acquire session information of each session from the first SMF corresponding to each session, respectively, if the user equipment has multiple sessions.
  • the second AMF includes: a first acquiring module, configured to acquire session information of the user equipment from the first SMF when the connection with the first SMF can be established; and a second acquiring module, The session information of the user equipment is obtained by using the second SMF, where the second SMF is the SMF allocated by the second AMF to the user equipment, in the case that the connection with the first SMF cannot be established.
  • the foregoing second obtaining module includes: a sending submodule, configured to send a handover preparation request to the second SMF after the second SMF is allocated to the user equipment, to instruct the second SMF to acquire the session information of the user equipment from the first SMF. And a receiving submodule configured to receive session information of the user equipment returned by the second SMF.
  • the first AMF is further configured to send the handover request information and the address information of the first SMF to the second AMF.
  • the AMF After the AMF receives the handover request, if no cross-AMF handover occurs, the AMF needs to acquire session information from the SMF, and then requests resources from the target base station. If the source AMF (ie, the first AMF) finds that a cross-AMF handover is required, the source AMF sends the SMF's address and the handover request to the target AMF (ie, the second AMF). After the target AMF receives the handover request (the address carrying the SMF), if it can connect to the source SMF, the AMF queries the source SMF for QoS information and requests the target NR base station; otherwise, the target AMF allocates a new SMF and forwards the request. .
  • the source AMF ie, the first AMF
  • the target AMF After the target AMF receives the handover request (the address carrying the SMF), if it can connect to the source SMF, the AMF queries the source SMF for QoS information and requests the target NR base station; otherwise, the
  • the target SMF requests the QoS information from the source SMF, and after receiving the information of the source SMF, requests the resource from the target base station and returns the information to the AMF, thereby solving the technical problem that the target side cannot reserve resources for the user terminal in the related art.
  • each of the above modules may be implemented by software or hardware.
  • the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the above modules are in any combination.
  • the forms are located in different processors.
  • Embodiments of the present disclosure also provide a storage medium.
  • the foregoing storage medium may be configured to store program code for performing the following steps:
  • the user equipment in the case that the user equipment does not need to perform the cross-AMF handover, send the handover preparation request to the second base station, request the target resource for the user equipment, and the handover preparation request carries the handover request information and the session information of the user equipment, and the AMF handover process is performed.
  • the AMF of the user equipment is changed from the first AMF to the second AMF;
  • the handover request information is sent to the second AMF, and the second AMF sends a handover preparation request to the second base station to request the target resource for the user equipment.
  • the foregoing storage medium may include, but not limited to, a USB flash drive, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, and a magnetic memory.
  • ROM Read-Only Memory
  • RAM Random Access Memory
  • a mobile hard disk e.g., a hard disk
  • magnetic memory e.g., a hard disk
  • the processor performs, according to the stored program code in the storage medium, receiving the handover request information sent by the first base station, where the handover request information is used to request to switch the user equipment from the first base station to the first base station.
  • a second base station where the user equipment does not need to perform the cross-AMF handover, the handover preparation request is sent to the second base station, and the target resource is requested by the user equipment, where the handover preparation request carries the handover request information and the session information of the user equipment,
  • the AMF of the user equipment is changed from the first AMF to the second AMF during the AMF handover process; when the user equipment needs to perform the cross AMF handover, the handover request information is sent to the second AMF, and the second AMF sends the handover preparation request to The second base station requests a target resource for the user equipment.
  • an embodiment of the present disclosure provides a storage medium on which a computer program is stored, and when the computer program is executed by the processor, the steps of the first AMF side method of the embodiment of the present disclosure are implemented.
  • embodiments of the present disclosure further provide a storage medium having stored thereon a computer program that, when executed by a processor, implements the steps of the second AMF side method of the embodiments of the present disclosure.
  • embodiments of the present disclosure provide a storage medium that can be configured to store program code for performing the following steps:
  • the received handover request information is sent after the first AMF receives the handover request information sent by the first base station, and the user equipment needs to perform the cross-AMF handover;
  • the switching request information received by the first AMF is used to request to switch the user equipment from the first base station to the second base station; and the AMF of the user equipment is changed from the first AMF to the second AMF in the cross AMF switching process ;
  • modules or steps of the present disclosure described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module. As such, the disclosure is not limited to any specific combination of hardware and software.
  • the first AMF receives the handover request information sent by the first base station, where the handover request information is used to request to switch the user equipment from the first base station to the second base station; and the user equipment does not need to perform cross-AMF handover.
  • the first AMF sends a handover preparation request to the second base station, and requests the target resource for the user equipment, where the handover preparation request carries the handover request information and the session information of the user equipment, and the AMF of the user equipment in the AMF handover process
  • the AMF is changed to the second AMF; in the case that the user equipment needs to perform the cross AMF handover, the first AMF sends the handover request information to the second AMF, and the second AMF sends the handover preparation request to the second base station to request the user equipment.
  • the target resource enables the target base station side to reserve the target resource for the user equipment, thereby solving the technical problem that the target side cannot reserve resources for the user terminal in the related art, and realizes the technology of reserving the target resource for the user equipment on the target base station side. effect.

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Abstract

本公开提供了一种基站的切换方法、系统和存储介质。其中，该方法包括：第一接入与移动性管理功能（AMF）接收第一基站发送的切换请求信息，切换请求信息用于请求将用户设备从第一基站切换至第二基站；在用户设备不需要进行跨AMF切换的情况下，第一AMF发送切换准备请求至第二基站，为用户设备请求目标资源，跨AMF切换过程中用户设备的AMF由第一AMF变更为第二AMF；在用户设备需要进行跨AMF切换的情况下，第一AMF将切换请求信息发送至第二AMF，由第二AMF发送切换准备请求至第二基站，为用户设备请求目标资源。

Description

基站的切换方法、系统和存储介质
相关申请的交叉引用
本申请基于申请号为201710067392.7、申请日为2017年02月07日的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此引入本申请作为参考。
技术领域
本公开涉及通信领域，具体而言，涉及一种基站的切换方法、系统和存储介质。
背景技术
3GPP(3rd Generation Partnership Project，第三代合作伙伴计划)从R14开始就在讨论下一代通讯系统(NextGen System)，下一代通讯系统能够支持演进的移动宽带(eMBB，Evolved Mobile Broadband)、海量机器类通信(mMTC，Massive Machine Type Communication)、超可靠机器类通讯(uMTC，ultra reliable Machine Type Communication)三种业务类型，这三种业务类型具有不同的网络特性。图1示出了下一代移动通信网络架构，其中各网元的功能如下：
终端即用户设备(UE，User Equipment)，主要通过下一代无线空口接入网络并获得服务，终端通过空口和基站交互信息，通过非接入层信令和核心网的公共控制面功能以及会话控制面功能交互信息。
下一代基站(gNB)，也可以称为下一代(NG)无线接入网(RAN，Radio Access Network)，也即NR基站，负责终端接入网络的空口资源调度和以及空口的连接管理。
会话控制面功能(SMF，Session Management Function)，也即会话管理功能，配置为和终端交互，主要负责处理用户分组数据单元(PDU，Packet  Data Unit)会话建立、修改和删除请求，选择用户面功能(UPF，User Plane function)；建立终端到UPF之间的用户面连接；并和策略控制功能(PCF，Policy Control Function)一起确定会话的服务质量(QoS，Quality of Service)参数等功能。
接入与移动性控制功能(AMF，Access and Mobility control Function)，也即接入与移动性管理功能，是核心网内的公共控制面功能。一个用户只有一个AMF，其负责对用户的鉴权、授权以及签约检查以保证用户是合法用户；用户移动性管理，包括位置注册和临时标识分配；当用户发起PDU连接建立请求的时候，为UE选择合适的SMF；转发UE和SMF之间的非接入层(NAS，Non Access Stratum)信令；转发基站和SMF之间的接入层(AS，Access Stratum)信令。
UPF，提供用户面处理功能，包括数据转发、QoS执行。UPF还提供用户移动时候的用户面锚点，保证业务连续性。
PCF，向提供SMF提供用户的服务质量相关的规则(QoS rule)。
签约数据管理功能(SDM，Subscription Data management)，存储了用户的签约数据。
需要说明的是，图1中两个网元之间的接口(如N1、N2、N3等)为所连接的两个网元之间进行通讯的接口。
和传统无线通讯系统类似，随着用户位置的移动，会发生基站切换。图2示出了切换的流程：
步骤S201，PDU会话建立过程，UE和网络建立了PDU会话(即PDU session)，并且有业务。
步骤S202，基站1(RAN1)确定需要发起基站切换，根据UE的测量报告，确定切换的目的基站2(RAN2)。基站1判断和目的基站2之间没有直接接口，向AMF发起切换请求，消息中带有目的基站信息和当前会话信息，会话信息中包括PDU会话信息，包括PDU会话标识。
步骤S203，进行切换准备，AMF根据目的基站信息，向目的基站2发起切换请求消息，消息中带有当前会话信息，当前会话信息包括PDU会话 信息，包括PDU会话标识、QoS信息(是否包含N3的上行隧道标识)。
步骤S204，切换准备响应，目的基站2根据PDU会话信息，预留无线资源，并返回切换请求响应消息，带有预留的无线资源信息。该消息还带有目的基站2为每个预留资源成功的PDU会话分配的N3隧道下行隧道标识。
步骤S205，AMF判断如果有PDU会话的资源预留成功，则向基站1返回切换请求响应消息，带有目的基站2为这些PDU会话预留的无线资源信息。
步骤S206，基站1向UE发起切换命令，带有基站2预留的无线资源信息。
步骤S207，用户接入请求，终端根据目的基站2预留的无线资源信息，接入基站2。
步骤S208，切换完成，目的基站2向AMF发起完成消息。
步骤S209，AMF向SMF发起PDU会话更新请求，带有目的基站2为每个会话分配的N3隧道下行隧道标识。
步骤S210，SMF和UPF交互更新N3隧道下行隧道标识，然后向AMF返回路径切换响应，即PDU会话更新响应。
步骤S211，AMF向基站1(源基站)发送N2连接释放请求。
步骤S212，如果该基站小区不在UE的TA list(TA全称为跟踪区(TrackingArea)，TA是LTE系统与UE的位置管理新设立的概念列表)中，触发位置更新过程。
AMF是负责移动性的网元，其不保存会话信息，因此在步骤S203中，AMF需要获得用户设备的会话信息。同时，AMF和UE的位置相关，每个UE只有一个AMF为其服务。随着UE的移动，其可能移出AMF服务区。此时，会导致AMF改变，AMF的改变也可能导致SMF的改变。目前还没有这些情况下，如何在目标侧预留资源的技术。
针对相关技术中目标侧不能为用户终端预留资源的技术问题，目前尚未提出有效的解决方案。
发明内容
本公开实施例提供了一种基站的切换方法、系统和存储介质。
根据本公开实施例的一个方面，提供了一种基站的切换方法，包括：第一AMF接收第一基站发送的切换请求信息，其中，切换请求信息用于请求将用户设备从第一基站切换至第二基站；在用户设备不需要进行跨AMF切换的情况下，第一AMF发送切换准备请求至第二基站，为用户设备请求目标资源，其中，切换准备请求携带有切换请求信息和用户设备的会话信息，跨AMF切换过程中用户设备的AMF由第一AMF变更为第二AMF；在用户设备需要进行跨AMF切换的情况下，第一AMF将切换请求信息发送至第二AMF，由第二AMF发送切换准备请求至第二基站，为用户设备请求目标资源。
上述方案中，在第一AMF发送切换准备请求至第二基站之前，该方法还包括：第一AMF从第一SMF获取用户设备的会话信息。
上述方案中，第一AMF从第一SMF获取用户设备的会话信息包括：在用户设备具有多个会话的情况下，第一AMF分别从与每个会话对应的第一SMF获取每个会话的会话信息。
上述方案中，在第二AMF发送切换准备请求至第二基站之前，该方法还包括：在能够建立与第一SMF的连接的情况下，第二AMF从第一SMF获取用户设备的会话信息；在不能够建立与第一SMF的连接的情况下，第二AMF通过第二SMF获取用户设备的会话信息，其中，第二SMF是第二AMF为用户设备分配的SMF。
上述方案中，第二AMF通过第二SMF获取用户设备的会话信息包括：在为用户设备分配完第二SMF之后，第二AMF将切换准备请求发送至第二SMF，以指示第二SMF从第一SMF获取用户设备的会话信息；第二AMF接收第二SMF返回的用户设备的会话信息。
上述方案中，第一AMF将切换请求信息发送至第二AMF包括：第一AMF将切换请求信息和第一SMF的地址信息发送给第二AMF。
上述方案中，在第二AMF发送切换准备请求至第二基站之前，该方法 还包括：第二AMF判断预设地址集合中是否存在与第一SMF的地址信息匹配的地址，其中，预设地址集合中的地址为允许第二AMF连接的地址；其中，在判断出预设地址集合中存在与第一SMF的地址信息匹配的地址的情况下，确定第二AMF能够建立与第一SMF的连接，在判断出预设地址集合中不存在与第一SMF的地址信息匹配的地址的情况下，确定第二AMF不能够建立与第一SMF的连接。
上述方案中，该方法还包括：第一基站在接收到针对切换请求信息的响应消息的情况下，向用户设备发送携带有目标资源的指示信息的切换命令；其中，用户设备按照切换命令的指示切换至第二基站，并通过目标资源承载会话。
上述方案中，会话信息包括会话的Qos信息。
根据本公开实施例的另一个方面，提供了一种基站的切换系统，该系统包括：第一AMF，配置为接收第一基站发送的切换请求信息，其中，切换请求信息用于请求将用户设备从第一基站切换至第二基站；第一AMF还配置为在用户设备不需要进行跨AMF切换的情况下，发送切换准备请求至第二基站，为用户设备请求目标资源，其中，切换准备请求携带有切换请求信息和用户设备的会话信息，跨AMF切换过程中用户设备的AMF由第一AMF变更为第二AMF；第二AMF，配置为在用户设备需要进行跨AMF切换的情况下，接收第一AMF发送的切换请求信息，并发送切换准备请求至第二基站，为用户设备请求目标资源。
上述方案中，第一AMF还配置为从第一SMF获取用户设备的会话信息。
上述方案中，第一AMF还配置为在用户设备具有多个会话的情况下，分别从与每个会话对应的第一SMF获取每个会话的会话信息。
上述方案中，第二AMF包括：第一获取模块，配置为在能够建立与第一SMF的连接的情况下，从第一SMF获取用户设备的会话信息；第二获取模块，配置为在不能够建立与第一SMF的连接的情况下，通过第二SMF获取用户设备的会话信息，其中，第二SMF是第二AMF为用户设备分配的SMF。
上述方案中，第二获取模块包括：发送子模块，配置为在为用户设备分配完第二SMF之后，将切换准备请求发送至第二SMF，以指示第二SMF从第一SMF获取用户设备的会话信息；接收子模块，配置为接收第二SMF返回的用户设备的会话信息。
上述方案中，第一AMF还配置为将切换请求信息和第一SMF的地址信息发送给第二AMF。
上述方案中，会话信息包括会话的Qos信息。
根据本公开的另一个实施例，提供了一种基站的切换方法，包括：第一接入与移动性管理功能AMF接收第一基站发送的切换请求信息，其中，所述切换请求信息用于请求将用户设备从所述第一基站切换至第二基站；在所述用户设备不需要进行跨AMF切换的情况下，所述第一AMF将发送切换准备请求至所述第二基站，为所述用户设备请求目标资源，其中，所述切换准备请求携带有所述切换请求信息和所述用户设备的会话信息，所述跨AMF切换过程中所述用户设备的AMF由所述第一AMF变更为第二AMF；在所述用户设备需要进行跨AMF切换的情况下，所述第一AMF将切换请求信息发送至所述第二AMF，所述切换请求信息用于供所述第二AMF发送所述切换准备请求至所述第二基站，为所述用户设备请求所述目标资源。
上述方案中，所述第一AMF发送切换准备请求至所述第二基站之前，所述方法还包括：
所述第一AMF从第一SMF获取所述用户设备的会话信息。
上述方案中，所述第一AMF从第一SMF获取所述用户设备的会话信息包括：
在所述用户设备具有多个会话的情况下，所述第一AMF分别从与每个所述会话对应的所述第一SMF获取每个所述会话的会话信息。
上述方案中，所述第一AMF将所述切换请求信息发送至所述第二AMF包括：
所述第一AMF将所述切换请求信息和第一SMF的地址信息发送给所 述第二AMF。
根据本公开的另一个实施例，提供了一种基站的切换方法，包括：
第二AMF接收第一AMF发送的切换请求信息；接收的切换请求信息是所述第一AMF接收到第一基站发送的切换请求信息后，且在用户设备需要进行跨AMF切换的情况下发送的；所述第一AMF接收的切换请求信息用于请求将用户设备从所述第一基站切换至第二基站；所述跨AMF切换过程中所述用户设备的AMF由所述第一AMF变更为第二AMF；
所述第二AMF发送切换准备请求至所述第二基站，为所述用户设备请求所述目标资源。
上述方案中，在所述第二AMF发送切换准备请求至所述第二基站之前，所述方法还包括：
在能够建立与第一SMF的连接的情况下，所述第二AMF从所述第一SMF获取所述用户设备的会话信息；
在不能够建立与所述第一SMF的连接的情况下，所述第二AMF通过第二SMF获取所述用户设备的会话信息，其中，所述第二SMF是所述第二AMF为所述用户设备分配的SMF。
上述方案中，所述第二AMF通过第二SMF获取所述用户设备的会话信息包括：
在为所述用户设备分配完所述第二SMF之后，所述第二AMF将切换准备请求发送至所述第二SMF，以指示所述第二SMF从所述第一SMF获取所述用户设备的会话信息；
所述第二AMF接收所述第二SMF返回的所述用户设备的会话信息。
上述方案中，所述第二AMF接收第一AMF发送的切换请求信息时，所述方法还包括：
所述第二AMF接收所述第一AMF发送的第一SMF的地址信息。
根据本公开的另一个实施例，提供了一种存储介质，存储介质可以被设置为存储用于执行以下步骤的程序代码：接收第一基站发送的切换请求信息，其中，切换请求信息用于请求将用户设备从第一基站切换至第二基 站；在用户设备不需要进行跨AMF切换的情况下，发送切换准备请求至第二基站，为用户设备请求目标资源，其中，切换准备请求携带有切换请求信息和用户设备的会话信息，跨AMF切换用于指示用户设备的AMF由第一AMF变更为第二AMF；在用户设备需要进行跨AMF切换的情况下，将切换请求信息发送至第二AMF，由第二AMF发送切换准备请求至第二基站，为用户设备请求目标资源。
也就是说，根据本公开的另一个实施例，提供了一种存储介质，其上存储有计算机程序，计算机程序被执行时实现上述第一AMF侧任一方法的步骤。
根据本公开的另一个实施例，提供了一种存储介质，其上存储有计算机程序，计算机程序被执行时实现上述第二AMF侧任一方法的步骤。
在本公开实施例中，第一AMF接收第一基站发送的切换请求信息，切换请求信息用于请求将用户设备从第一基站切换至第二基站；在用户设备不需要进行跨AMF切换的情况下，第一AMF发送切换准备请求至第二基站，为用户设备请求目标资源，其中，切换准备请求携带有切换请求信息和用户设备的会话信息，跨AMF切换过程中用户设备的AMF由第一AMF变更为第二AMF；在用户设备需要进行跨AMF切换的情况下，第一AMF将切换请求信息发送至第二AMF，由第二AMF发送切换准备请求至第二基站，为用户设备请求目标资源，使目标基站侧能够为用户设备预留目标资源，从而解决了相关技术中目标侧不能为用户终端预留资源的技术问题，实现了在目标基站侧为用户设备预留目标资源的技术效果。
附图说明
此处所说明的附图用来提供对本公开的进一步理解，构成本申请的一部分，本公开的示意性实施例及其说明用于解释本公开。在附图中：
图1是相关技术中的移动通信网络架构的示意图；
图2是相关技术中的进行基站切换的流程图；
图3是根据本公开实施例的可选的基站的切换方法的流程图；
图4是根据本公开实施例的可选的基站的切换方法的流程图；
图5是根据本公开实施例的可选的基站的切换方法的流程图；
图6是根据本公开实施例的可选的基站的切换方法的流程图；
图7是根据本公开实施例的可选的基站的切换方法的流程图；
图8是根据本公开实施例的基站的切换系统的示意图。
具体实施方式
下文中将参考附图并结合实施例来详细说明本公开。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
需要说明的是，本公开的说明书和权利要求书及上述附图中的术语“第一”、“第二”等是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。
实施例1
根据本公开实施例，提供了一种基站的切换方法的方法实施例，需要说明的是，在附图的流程图示出的步骤可以在诸如一组计算机可执行指令的计算机系统中执行，并且，虽然在流程图中示出了逻辑顺序，但是在某些情况下，可以以不同于此处的顺序执行所示出或描述的步骤。
图3是根据本公开实施例的可选的基站的切换方法的流程图，如图3所示，该方法包括如下步骤：
步骤S301，第一AMF接收第一基站发送的切换请求信息，切换请求信息用于请求将用户设备从第一基站切换至第二基站。
步骤S302，在用户设备不需要进行跨AMF切换的情况下，第一AMF发送切换准备请求至第二基站，为用户设备请求目标资源，切换准备请求携带有切换请求信息和用户设备的会话信息，跨AMF切换过程中用户设备的AMF由第一AMF变更为第二AMF。
步骤S303，在用户设备需要进行跨AMF切换的情况下，第一AMF将切换请求信息发送至第二AMF，由第二AMF发送切换准备请求至第二基站，为用户设备请求目标资源。
通过上述实施例，第一AMF接收第一基站发送的切换请求信息，切换请求信息用于请求将用户设备从第一基站切换至第二基站；在用户设备不需要进行跨AMF切换的情况下，第一AMF发送切换准备请求至第二基站，为用户设备请求目标资源，切换准备请求携带有切换请求信息和用户设备的会话信息，跨AMF切换过程中用户设备的AMF由第一AMF变更为第二AMF；在用户设备需要进行跨AMF切换的情况下，第一AMF将切换请求信息发送至第二AMF，由第二AMF发送切换准备请求至第二基站，为用户设备请求目标资源，使目标基站侧能够为用户设备预留目标资源，从而解决了相关技术中目标侧不能为用户终端预留资源的技术问题，实现了在目标基站侧为用户设备预留目标资源的技术效果。
在上述实施例中，在第一AMF发送切换准备请求至第二基站之前，第一AMF从第一SMF获取用户设备的会话信息。
在一实施例中，第一AMF从第一SMF获取用户设备的会话信息包括：在用户设备具有多个会话的情况下，第一AMF分别从与每个会话对应的第一SMF获取每个会话的会话信息。
在一个可选的实施例中，第二AMF发送切换准备请求至第二基站之前，在能够建立与第一SMF的连接的情况下，第二AMF从第一SMF获取用户设备的会话信息；在不能够建立与第一SMF的连接的情况下，第二AMF通过第二SMF获取用户设备的会话信息，其中，第二SMF是第二AMF为用户设备分配的SMF。
在上述实施例中，第二AMF通过第二SMF获取用户设备的会话信息包括：在为用户设备分配完第二SMF之后，第二AMF将切换准备请求发送至第二SMF，以指示第二SMF从第一SMF获取用户设备的会话信息；第二AMF接收第二SMF返回的用户设备的会话信息。
需要说明的是，第一AMF将切换请求信息发送至第二AMF包括：第一AMF将切换请求信息和第一SMF的地址信息发送给第二AMF。
可选地，在第二AMF发送切换准备请求至第二基站之前，第二AMF判断预设地址集合中是否存在与第一SMF的地址信息匹配的地址，其中，预设地址集合中的地址为允许第二AMF连接的地址；其中，在判断出预设 地址集合中存在与第一SMF的地址信息匹配的地址的情况下，确定第二AMF能够建立与第一SMF的连接，在判断出预设地址集合中不存在与第一SMF的地址信息匹配的地址的情况下，确定第二AMF不能够建立与第一SMF的连接。
可选地，第一基站在接收到针对切换请求信息的响应消息的情况下，向用户设备发送携带有目标资源的指示信息的切换命令；其中，用户设备按照切换命令的指示切换至第二基站，并通过目标资源承载会话。
通过上述实施例，AMF收到切换请求后，如果没有发生跨AMF切换，AMF需要向SMF获取会话信息，然后向目标基站请求资源。如果源AMF(即第一AMF)发现需要跨AMF切换，源AMF则把SMF的地址以及切换请求发送给目标AMF(即第二AMF)。目标AMF收到切换请求(携带有SMF的地址)后，如果可以连接到源SMF，则AMF向源SMF询问QoS信息，向目标NR基站请求资源；否则：目标AMF分配新的SMF，并转发请求。目标SMF向源SMF请求QoS信息，在收到源SMF的信息后，向目标基站请求资源，返回给AMF，从而解决了相关技术中目标侧不能为用户终端预留资源的技术问题。
下面结合图4至图7所示的实施方式详述本申请的实施例。
图4是本公开实施例中跨基站切换流程图，本例中，UE附着到NextGen system后，建立了2个PDU session。SMF1/UPF1服务于第一个PDU session，SMF2/PDU2服务于，SMF2/PDU2服务。其中，
UE附着到NextGen system，并建立了2个PDU session。且每个PDU session都有上/下行流量。
如图4所示，跨基站切换流程包括：
步骤S401，基站1(NG RAN1)确定需要发起基站切换，根据UE的测量报告，确定切换的目的基站2(NG RAN2)。基站1判断和目的基站2之间没有NX2接口，向AMF发起切换请求，消息中带有目的基站信息和当前会话信息，会话信息中包括PDU会话信息。
步骤S402，AMF根据PDU会话1信息，向SMF1/UPF1请求PDU会 话1的QoS信息；会话会话1的QoS信息包括会话1的QoS参数和PDU会话1的N3上行隧道信息。
步骤S403，SMF1/UPF1返回会话1的会话信息。
步骤S404，AMF根据PDU会话2的信息，向SMF2/UPF2请求PDU会话2的QoS信息；会话2的QoS信息包括PDU会话2的QoS信息和PDU会话2的N3上行隧道信息。
步骤S405，SMF2/UPF2返回会话2的会话信息。
步骤S406，AMF向目的基站即基站2请求资源预留(即发送切换准备请求)。
步骤S407，基站2根据PDU会话信息，预留无线资源，并返回切换请求响应消息，带有预留的无线资源信息。该消息还带有目的基站2为每个预留资源成功的PDU会话分配的N3隧道下行隧道标识。
步骤S408，AMF向基站1返回切换请求响应消息(包括切换命令)，带有目的基站2为这些PDU会话预留的无线资源信息。
步骤S409，基站1向UE发起切换命令，带有基站2预留的无线资源信息。
步骤S410，UE接入目的基站。
步骤S411，基站2向AMF发起切换通知消息。
步骤S412，AMF向SMF1发起切换通知，带有目的基站2为PDU会话1分配的N3隧道下行隧道标识。SMF1和UPF1交互更新N3隧道下行隧道标识，然后向AMF返回路径切换响应。
步骤S413，AMF向SMF2发起切换通知，带有目的基站2为PDU会话2分配的N3隧道下行隧道标识。SMF2和UPF2交互更新N3隧道下行隧道标识，然后向AMF返回路径切换响应。
步骤S414，AMF向源基站1发送N2连接释放请求，释放N2接口。
图5是本公开实施例中跨AMF切换，但是保持相同的SMF的流程图。
UE附着到NextGen system，并建立了1个PDU session。并且PDU session都有上/下行流量。当建立多个PDU session时，其原理和图4类似。
图5所示的基站的切换方法的流程，包括：
步骤S501，基站1确定需要发起基于切换，根据UE的测量报告，确定切换的目的基站2。基站1判断和目的基站2之间没有NX2接口，后向sAMF(即源AMF和第一AMF)发起切换请求，消息中带有目的基站信息和当前会话信息，会话信息中包括PDU会话信息。
步骤S502，sAMF(即源AMF)根据目的基站信息选择目的tAMF(即目的AMF，也即本发明实施例中的第二AMF)，然后向tAMF发起切换准备请求，消息中带有目的基站信息和当前会话信息，当前会话信息包括sSMF地址，PDU会话信息。
步骤S503，tAMF根据sSMF信息，向sSMF发送切换请求PDU会话的信息。
步骤S504，sSMF返回PDU会话的信息，包含QoS等信息。
步骤S505，tAMF根据会话的信息向目的基站2(NG RAN2)请求资源预留(如发送切换准备请求)。
步骤S506，基站2根据PDU会话信息，预留无线资源，并返回切换准备响应消息，带有预留的无线资源信息。该消息还带有目的基站2为每个预留资源成功的PDU会话分配N3隧道下行隧道标识。
步骤S507，tAMF向sAMF返回切换准备响应，消息中带有目的基站为PDU会话预留的无线资源信息。
步骤S508，sAMF判断如果有PDU会话的资源预留成功，则向基站1返回切换请求响应消息(携带有切换命令)，带有目的基站2为这些PDU会话预留的无线资源信息。
步骤S509，基站1向UE发起切换命令，带有基站2预留的无线资源信息。
步骤S510，终端根据基站2预留的无线资源信息，接入基站2。
步骤S511，基站2向tAMF发起切换通知消息。
步骤S512，tAMF向SMF发起切换通知，带有目的基站2为每个会话分配的N3隧道下行隧道标识。SMF和UPF交互更新N3隧道下行隧道标识，然后向tAMF返回路径切换响应。
步骤S513，tAMF向sAMF返回切换完成消息。
步骤S514，sAMF向源基站1发送N2连接释放请求。
图6是本公开实施例中跨AMF切换，同时改变SMF的流程图。
UE附着到NextGen system，并建立了1个PDU session。并且PDU session都有上/下行流量。当建立多个PDU session时，其原理和图4类似。
图6所示的基站的切换方法的流程，包括：
步骤S601，基站1(NG RAN1)确定需要发起基于切换，根据UE的测量报告，确定切换的目的基站2(NG RAN2)。基站1判断和目的基站2之间没有NX2接口，后向sAMF发起切换请求，消息中带有目的基站信息和当前会话信息，会话信息中包括PDU会话信息。
步骤S602，sAMF(即源AMF，也即本发明实施例中的第一AMF)根据目的基站信息选择目的tAMF(即目的AMF，也即本发明实施例中的第二AMF)，然后向tAMF发起切换准备请求，消息中带有目的基站信息和当前会话信息，当前会话信息包括sSMF地址，PDU会话信息。
步骤S603，tAMF发现不能连接sSMF，则为PDU session分配一个新的tSMF，并将切换准备请求转发给tSMF。
步骤S604，tSMF选择UPF2，建立N4接口。UPF2分配下行的N9隧道标识，上行的N3隧道标识并返回给tSMF。
步骤S605，tSMF根据sSMF信息，向sSMF请求PDU会话信息，并携带下行N9隧道标识。
步骤S606，sSMF返回PDU会话的QoS信息，以及N9上行隧道标识。
步骤S607，tSMF向tAMF返回切换响应，包含了PDU会话的QoS信息。
步骤S608，tAMF向目的基站2请求资源预留(即发送切换准备请求)。
步骤S609，基站2根据PDU会话信息，预留无线资源，并返回切换准备响应消息，带有预留的无线资源信息。该消息还带有目的基站2为每个预留资源成功的PDU会话分配的N3隧道下行隧道标识。
步骤S610，tAMF向sAMF返回切换准备响应，消息中带有目的基站2为PDU会话预留的无线资源信息。
步骤S611，sAMF判断如果PDU会话的资源预留成功，则向基站1返回切换请求响应消息(携带有切换命令)，带有目的基站2为这些PDU会话预留的无线资源信息。
步骤S612，基站1向UE发起切换命令，带有基站2预留的无线资源信息。
步骤S613，终端根据基站2预留的无线资源信息，接入基站2。
步骤S614，基站2向tAMF发起切换通知消息，提示切换完成。
步骤S615，tAMF向tSMF发起切换通知，带有目的基站2为每个PDU会话分配的N3隧道下行隧道标识，提示切换完成。
步骤S616，tSMF向sSMF发送切换完成，提示切换完成。
步骤S617，sSMF更新其控制的UPF用户面，随后下行数据向UPF2转发。
步骤S618，进行会话更新，tSMF和UPF2交互更新N3隧道下行隧道标识，以及N9上行隧道标识。
上述的步骤S616和618可以是并行的。
步骤S619，tAMF向sAMF返回切换完成消息，提示切换完成。
步骤S620，sAMF向源基站1发送N2连接释放请求。
图7是本公开实施例中跨AMF切换，同时改变SMF，但是UPF不改变的流程图。本实施例大部分步骤和图6一样，这里只写出不一样的步骤进行说明。
UE附着到NextGen system，并建立了1个PDU session。并且PDU session都有上/下行流量。
步骤S701至步骤S703与步骤S601至步骤S603相同。
步骤S704，tSMF发现可以控制UPF后，不再分配新的UPF，tSMF向sSMF请求会话信息。
步骤S705，sSMF返回PDU会话的QoS信息(即会话信息)，其中包含UPF信息。
步骤S706，tSMF和UPF建立N4接口，UPF2分配下行的N9隧道标识，上行的N3隧道标识并返回给tSMF。
步骤S707至步骤S715与步骤S607至步骤S615相同。
步骤S716，tSMF向sSMF发送切换完成信息。
步骤S717，sSMF可以释放其和UPF之间的N4接口。
步骤S718，进行会话更新，tSMF和UPF交互更新N3隧道下行隧道标识。
上述的步骤S716和步骤S718可以是并行的。
步骤S719、步骤S720与步骤S619、步骤S620相同。
步骤S706后，UPF也可以主动释放和sSMF之间的N4接口。
通过上述实施例，AMF可获得需要的会话信息，AMF和UE的位置相关，每个UE只有一个AMF为其服务。随着UE的移动,其可能移出AMF服务区。此时，会导致AMF改变，AMF的改变也可能导致SMF的改变，在这些情况下，本申请也可实现在目标侧预留资源。
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到根据上述实施例的方法可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件，但很多情况下前者是更佳的实施方式。基于这样的理解，本公开的技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质(如ROM/RAM、磁碟、光盘)中，包括若干指令用以使得一台终端设备(可以是手机，计算机，服务器，或者网络设备等)执行本公开各个实施例所述 的方法。
实施例2
本公开实施例中还提供了一种基站的切换系统。该系统配置为实现上述实施例及具体实施方式，已经进行过说明的不再赘述。如以下所使用的，术语“模块”可以实现预定功能的软件和/或硬件的组合。尽管以下实施例所描述的装置较佳地以软件来实现，但是硬件，或者软件和硬件的组合的实现也是可能并被构想的。
本申请实施例的基站的切换方法可以运行于图8所示的网络架构上，图8是根据本公开实施例的基站的切换系统的示意图。如图8所示，该系统可以包括：第一AMF和第二AMF。
第一AMF，配置为接收第一基站发送的切换请求信息，其中，切换请求信息用于请求将用户设备从第一基站切换至第二基站；
第一AMF还配置为在用户设备不需要进行跨AMF切换的情况下，发送切换准备请求至第二基站，为用户设备请求目标资源，其中，切换准备请求携带有切换请求信息和用户设备的会话信息，跨AMF切换过程中用户设备的AMF由第一AMF变更为第二AMF；
第二AMF，配置为在用户设备需要进行跨AMF切换的情况下，接收第一AMF发送的切换请求信息，并发送切换准备请求至第二基站，为用户设备请求目标资源。
通过上述实施例，第一AMF接收第一基站发送的切换请求信息，切换请求信息用于请求将用户设备从第一基站切换至第二基站；第一AMF还在用户设备不需要进行跨AMF切换的情况下，发送切换准备请求至第二基站，为用户设备请求目标资源，切换准备请求携带有切换请求信息和用户设备的会话信息，跨AMF切换过程中用户设备的AMF由第一AMF变更为第二AMF；第二AMF在用户设备需要进行跨AMF切换的情况下，接收第一AMF发送的切换请求信息，并发送切换准备请求至第二基站，为用户设备请求目标资源，使目标基站侧能够为用户设备预留目标资源，从而解决了相关技术中目标侧不能为用户终端预留资源的技术问题，实现了在目标基站侧为用户设备预留目标资源的技术效果。
在上述实施例中，第一AMF还配置为从第一会话管理功能模块第一SMF获取用户设备的会话信息。
可选地，第一AMF还配置为在用户设备具有多个会话的情况下，分别从与每个会话对应的第一SMF获取每个会话的会话信息。
在一个可选的实施例中，第二AMF包括：第一获取模块，配置为在能够建立与第一SMF的连接的情况下，从第一SMF获取用户设备的会话信息；第二获取模块，配置为在不能够建立与第一SMF的连接的情况下，通过第二SMF获取用户设备的会话信息，其中，第二SMF是第二AMF为用户设备分配的SMF。
上述的第二获取模块包括：发送子模块，配置为在为用户设备分配完第二SMF之后，将切换准备请求发送至第二SMF，以指示第二SMF从第一SMF获取用户设备的会话信息；接收子模块，配置为接收第二SMF返回的用户设备的会话信息。
在另一个可选的实施例中，第一AMF还配置为将切换请求信息和第一SMF的地址信息发送给第二AMF。
通过上述实施例，AMF收到切换请求后，如果没有发生跨AMF切换，AMF需要向SMF获取会话信息，然后向目标基站请求资源。如果源AMF(即第一AMF)发现需要跨AMF切换，源AMF则把SMF的地址以及切换请求发送给目标AMF(即第二AMF)。目标AMF收到切换请求(携带有SMF的地址)后，如果可以连接到源SMF，则AMF向源SMF询问QoS信息，向目标NR基站请求资源；否则：目标AMF分配新的SMF，并转发请求。目标SMF向源SMF请求QoS信息，在收到源SMF的信息后，向目标基站请求资源，返回给AMF，从而解决了相关技术中目标侧不能为用户终端预留资源的技术问题。
需要说明的是，上述各个模块是可以通过软件或硬件来实现的，对于后者，可以通过以下方式实现，但不限于此：上述模块均位于同一处理器中；或者，上述各个模块以任意组合的形式分别位于不同的处理器中。
实施例3
本公开的实施例还提供了一种存储介质。可选地，在本实施例中，上述存储介质可以被设置为存储用于执行以下步骤的程序代码：
S1，接收第一基站发送的切换请求信息，切换请求信息用于请求将用户设备从第一基站切换至第二基站；
S2，在用户设备不需要进行跨AMF切换的情况下，发送切换准备请求至第二基站，为用户设备请求目标资源，切换准备请求携带有切换请求信息和用户设备的会话信息，跨AMF切换过程中用户设备的AMF由第一AMF变更为第二AMF；
S3，在用户设备需要进行跨AMF切换的情况下，将切换请求信息发送至第二AMF，由第二AMF发送切换准备请求至第二基站，为用户设备请求目标资源。
可选地，在本实施例中，上述存储介质可以包括但不限于：U盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、移动硬盘、磁碟或者光盘等各种可以存储程序代码的介质。
可选地，在本实施例中，处理器根据存储介质中已存储的程序代码执行：接收第一基站发送的切换请求信息，其中，切换请求信息用于请求将用户设备从第一基站切换至第二基站；在用户设备不需要进行跨AMF切换的情况下，发送切换准备请求至第二基站，为用户设备请求目标资源，其中，切换准备请求携带有切换请求信息和用户设备的会话信息，跨AMF切换过程中用户设备的AMF由第一AMF变更为第二AMF；在用户设备需要进行跨AMF切换的情况下，将切换请求信息发送至第二AMF，由第二AMF发送切换准备请求至第二基站，为用户设备请求目标资源。
也就是说，本公开实施例提供了一种存储介质，其上存储有计算机程序，计算机程序被处理器执行时实现本公开实施例第一AMF侧方法的步骤。
相应地，本公开实施例还提供了一种存储介质，其上存储有计算机程序，计算机程序被处理器执行时实现本公开实施例第二AMF侧方法的步骤。
具体地，本公开实施例提供了一种存储介质，存储介质可以被设置为存储用于执行以下步骤的程序代码：
接收第一AMF发送的切换请求信息；接收的切换请求信息是所述第一AMF接收到第一基站发送的切换请求信息后，且在用户设备需要进行跨AMF切换的情况下发送的；所述第一AMF接收的切换请求信息用于请求将用户设备从所述第一基站切换至第二基站；所述跨AMF切换过程中所述用户设备的AMF由所述第一AMF变更为第二AMF；
发送切换准备请求至所述第二基站，为所述用户设备请求所述目标资源。
可选地，本实施例中的具体示例可以参考上述实施例及可选实施方式中所描述的示例，本实施例在此不再赘述。
显然，本领域的技术人员应该明白，上述的本公开的各模块或各步骤可以用通用的计算装置来实现，它们可以集中在单个的计算装置上，或者分布在多个计算装置所组成的网络上，可选地，它们可以用计算装置可执行的程序代码来实现，从而，可以将它们存储在存储装置中由计算装置来执行，并且在某些情况下，可以以不同于此处的顺序执行所示出或描述的步骤，或者将它们分别制作成各个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。这样，本公开不限制于任何特定的硬件和软件结合。
以上所述仅为本公开的优选实施例而已，并不用于限制本公开，对于本领域的技术人员来说，本公开可以有各种更改和变化。凡在本公开的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本公开的保护范围之内。
工业实用性
本公开实施例提供的方案，第一AMF接收第一基站发送的切换请求信息，切换请求信息用于请求将用户设备从第一基站切换至第二基站；在用户设备不需要进行跨AMF切换的情况下，第一AMF发送切换准备请求至第二基站，为用户设备请求目标资源，其中，切换准备请求携带有切换请 求信息和用户设备的会话信息，跨AMF切换过程中用户设备的AMF由第一AMF变更为第二AMF；在用户设备需要进行跨AMF切换的情况下，第一AMF将切换请求信息发送至第二AMF，由第二AMF发送切换准备请求至第二基站，为用户设备请求目标资源，使目标基站侧能够为用户设备预留目标资源，从而解决了相关技术中目标侧不能为用户终端预留资源的技术问题，实现了在目标基站侧为用户设备预留目标资源的技术效果。

Claims (25)

  1. 一种基站的切换方法，包括：
    第一接入与移动性管理功能AMF接收第一基站发送的切换请求信息，其中，所述切换请求信息用于请求将用户设备从所述第一基站切换至第二基站；
    在所述用户设备不需要进行跨AMF切换的情况下，所述第一AMF发送切换准备请求至所述第二基站，为所述用户设备请求目标资源，其中，所述切换准备请求携带有所述切换请求信息和所述用户设备的会话信息，所述跨AMF切换过程中所述用户设备的AMF由所述第一AMF变更为第二AMF；
    在所述用户设备需要进行跨AMF切换的情况下，所述第一AMF将所述切换请求信息发送至所述第二AMF，由所述第二AMF发送所述切换准备请求至所述第二基站，为所述用户设备请求所述目标资源。
  2. 根据权利要求1所述的方法，其中，在所述第一AMF发送切换准备请求至所述第二基站之前，所述方法还包括：
    所述第一AMF从第一会话管理功能SMF获取所述用户设备的会话信息。
  3. 根据权利要求2所述的方法，其中，所述第一AMF从第一SMF获取所述用户设备的会话信息包括：
    在所述用户设备具有多个会话的情况下，所述第一AMF分别从与每个所述会话对应的所述第一SMF获取每个所述会话的会话信息。
  4. 根据权利要求1所述的方法，其中，在所述第二AMF发送所述切换准备请求至所述第二基站之前，所述方法还包括：
    在能够建立与第一SMF的连接的情况下，所述第二AMF从所述第一SMF获取所述用户设备的会话信息；
    在不能够建立与所述第一SMF的连接的情况下，所述第二AMF通过第二SMF获取所述用户设备的会话信息，其中，所述第二SMF是所 述第二AMF为所述用户设备分配的SMF。
  5. 根据权利要求4所述的方法，其中，所述第二AMF通过第二SMF获取所述用户设备的会话信息包括：
    在为所述用户设备分配完所述第二SMF之后，所述第二AMF将所述切换准备请求发送至所述第二SMF，以指示所述第二SMF从所述第一SMF获取所述用户设备的会话信息；
    所述第二AMF接收所述第二SMF返回的所述用户设备的会话信息。
  6. 根据权利要求1所述的方法，其中，所述第一AMF将所述切换请求信息发送至所述第二AMF包括：
    所述第一AMF将所述切换请求信息和第一SMF的地址信息发送给所述第二AMF。
  7. 根据权利要求6所述的方法，其中，在所述第二AMF发送所述切换准备请求至所述第二基站之前，所述方法还包括：
    所述第二AMF判断预设地址集合中是否存在与所述第一SMF的地址信息匹配的地址，其中，所述预设地址集合中的地址为允许所述第二AMF连接的地址；
    其中，在判断出所述预设地址集合中存在与所述第一SMF的地址信息匹配的地址的情况下，确定所述第二AMF能够建立与所述第一SMF的连接，在判断出所述预设地址集合中不存在与所述第一SMF的地址信息匹配的地址的情况下，确定所述第二AMF不能够建立与所述第一SMF的连接。
  8. 根据权利要求1至7中任一项所述的方法，其中，所述方法还包括：
    所述第一基站在接收到针对所述切换请求信息的响应消息的情况下，向所述用户设备发送携带有所述目标资源的指示信息的切换命令；
    其中，所述用户设备按照所述切换命令的指示切换至所述第二基站，并通过所述目标资源承载会话。
  9. 根据权利要求1至7中任一项所述的方法，其中，所述会话信息包括会话的服务质量Qos信息。
  10. 一种基站的切换系统，包括：
    第一接入与移动性管理功能AMF，配置为接收第一基站发送的切换请求信息，其中，所述切换请求信息用于请求将用户设备从所述第一基站切换至第二基站；
    所述第一AMF还配置为在所述用户设备不需要进行跨AMF切换的情况下，发送切换准备请求至所述第二基站，为所述用户设备请求目标资源，其中，所述切换准备请求携带有所述切换请求信息和所述用户设备的会话信息，所述跨AMF切换过程中所述用户设备的AMF由所述第一AMF变更为第二AMF；
    所述第二AMF，配置为在所述用户设备需要进行跨AMF切换的情况下，接收所述第一AMF发送的所述切换请求信息，并发送所述切换准备请求至所述第二基站，为所述用户设备请求所述目标资源。
  11. 根据权利要求10所述的系统，其中，所述第一AMF还配置为从第一会话管理功能SMF获取所述用户设备的会话信息。
  12. 根据权利要求11所述的系统，其中，所述第一AMF还配置为在所述用户设备具有多个会话的情况下，分别从与每个所述会话对应的所述第一SMF获取每个所述会话的会话信息。
  13. 根据权利要求10所述的系统，其中，所述第二AMF包括：
    第一获取模块，配置为在能够建立与第一SMF的连接的情况下，从所述第一SMF获取所述用户设备的会话信息；
    第二获取模块，配置为在不能够建立与所述第一SMF的连接的情况下，通过第二SMF获取所述用户设备的会话信息，其中，所述第二SMF是所述第二AMF为所述用户设备分配的SMF。
  14. 根据权利要求13所述的系统，其中，所述第二获取模块包括：
    发送子模块，配置为在为所述用户设备分配完所述第二SMF之后，将所述切换准备请求发送至所述第二SMF，以指示所述第二SMF从所 述第一SMF获取所述用户设备的会话信息；
    接收子模块，配置为接收所述第二SMF返回的所述用户设备的会话信息。
  15. 根据权利要求10所述的系统，其中，所述第一AMF还配置为将所述切换请求信息和第一SMF的地址信息发送给所述第二AMF。
  16. 根据权利要求10至15中任一项所述的系统，其中，所述会话信息包括会话的服务质量Qos信息。
  17. 一种基站的切换方法，包括：
    第一接入与移动性管理功能AMF接收第一基站发送的切换请求信息，其中，所述切换请求信息用于请求将用户设备从所述第一基站切换至第二基站；
    在所述用户设备不需要进行跨AMF切换的情况下，所述第一AMF将发送切换准备请求至所述第二基站，为所述用户设备请求目标资源，其中，所述切换准备请求携带有所述切换请求信息和所述用户设备的会话信息，所述跨AMF切换过程中所述用户设备的AMF由所述第一AMF变更为第二AMF；
    在所述用户设备需要进行跨AMF切换的情况下，所述第一AMF将切换请求信息发送至所述第二AMF，所述切换请求信息用于供所述第二AMF发送所述切换准备请求至所述第二基站，为所述用户设备请求所述目标资源。
  18. 根据权利要求17所述的方法，其中，所述第一AMF发送切换准备请求至所述第二基站之前，所述方法还包括：
    所述第一AMF从第一会话管理功能SMF获取所述用户设备的会话信息。
  19. 根据权利要求18所述的方法，其中，所述第一AMF从第一SMF获取所述用户设备的会话信息包括：
    在所述用户设备具有多个会话的情况下，所述第一AMF分别从与每个所述会话对应的所述第一SMF获取每个所述会话的会话信息。
  20. 根据权利要求17所述的方法，其中，所述第一AMF将所述切换请求信息发送至所述第二AMF包括：
    所述第一AMF将所述切换请求信息和第一SMF的地址信息发送给所述第二AMF。
  21. 一种基站的切换方法，包括：
    第二接入与移动性管理功能AMF接收第一AMF发送的切换请求信息；接收的切换请求信息是所述第一AMF接收到第一基站发送的切换请求信息后，且在用户设备需要进行跨AMF切换的情况下发送的；所述第一AMF接收的切换请求信息用于请求将用户设备从所述第一基站切换至第二基站；所述跨AMF切换过程中所述用户设备的AMF由所述第一AMF变更为第二AMF；
    所述第二AMF发送切换准备请求至所述第二基站，为所述用户设备请求所述目标资源。
  22. 根据权利要求21所述的方法，其中，在所述第二AMF发送切换准备请求至所述第二基站之前，所述方法还包括：
    在能够建立与第一会话管理功能SMF的连接的情况下，所述第二AMF从所述第一SMF获取所述用户设备的会话信息；
    在不能够建立与所述第一SMF的连接的情况下，所述第二AMF通过第二SMF获取所述用户设备的会话信息，其中，所述第二SMF是所述第二AMF为所述用户设备分配的SMF。
  23. 根据权利要求22所述的方法，其中，所述第二AMF通过第二SMF获取所述用户设备的会话信息包括：
    在为所述用户设备分配完所述第二SMF之后，所述第二AMF将切换准备请求发送至所述第二SMF，以指示所述第二SMF从所述第一SMF获取所述用户设备的会话信息；
    所述第二AMF接收所述第二SMF返回的所述用户设备的会话信息。
  24. 根据权利要求21所述的方法，其中，所述第二AMF接收第 一AMF发送的切换请求信息时，所述方法还包括：
    所述第二AMF接收所述第一AMF发送的第一SMF的地址信息。
  25. 一种存储介质，其上存储有计算机程序，计算机程序被执行时实现权利要求17至20任一项所述方法的步骤，或者实现权利要求21至24任一项所述方法的步骤。
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