WO2021093182A1 - Techniques de gestion de relocalisation de fonction de gestion d'accès et de mobilité (amf) - Google Patents

Techniques de gestion de relocalisation de fonction de gestion d'accès et de mobilité (amf) Download PDF

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Publication number
WO2021093182A1
WO2021093182A1 PCT/CN2020/073816 CN2020073816W WO2021093182A1 WO 2021093182 A1 WO2021093182 A1 WO 2021093182A1 CN 2020073816 W CN2020073816 W CN 2020073816W WO 2021093182 A1 WO2021093182 A1 WO 2021093182A1
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message
network element
core network
amf
identifier
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PCT/CN2020/073816
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English (en)
Inventor
Fei Lu
Shilin You
Jinguo Zhu
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Zte Corporation
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Priority to PCT/CN2020/073816 priority Critical patent/WO2021093182A1/fr
Priority to CN202080093124.2A priority patent/CN114946231A/zh
Publication of WO2021093182A1 publication Critical patent/WO2021093182A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/18—Management of setup rejection or failure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service
    • 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

  • This disclosure is directed generally to digital wireless communications.
  • LTE Long-Term Evolution
  • 3GPP 3rd Generation Partnership Project
  • LTE-A LTE Advanced
  • 5G The 5th generation of wireless system, known as 5G, advances the LTE and LTE-Awireless standards and is committed to supporting higher data-rates, large number of connections, ultra-low latency, high reliability and other emerging business needs.
  • AMF Access and Mobility Management Function
  • a wireless communication method comprises receiving, by a network node, a first message that indicates that a radio resource control (RRC) connection establishment is complete, where the first message is received in response to a rejection of a first registration by a first core network element with a communication node, and sending, to a second core network element and after receiving the first message, a second message that requests a second registration of the communication node with the second core network element, where the first message and the second message include the identifier of the second core network element.
  • RRC radio resource control
  • a wireless communication method comprises receiving, by a communication node, a first message that indicates a rejection of a first registration by a first core network element with the communication node, and sending, to a network node after receiving the first message, a second message that indicates that radio resource control (RRC) connection establishment is complete, where the first message and the second message include an identifier of a second core network element, and where the sending the second message triggers a second registration of the communication node with the second core network element.
  • RRC radio resource control
  • a wireless communication method comprises receiving, by a network node from a communication node, a first message that indicates that a radio resource control (RRC) connection establishment is complete, and sending, to a first core network element and after receiving the first message, a second message that requests a registration of the communication node with the first core network element, where the first message and the second message include an identifier of the first core network element.
  • RRC radio resource control
  • a wireless communication method comprises receiving, by a communication node from a network node, a first message that indicates release of radio resource control (RRC) , and sending, to the network node and after receiving the first message, a second message that indicates that a RRC connection establishment is complete, where the first message and the second message include an identifier of a first core network element, and where the sending the second message triggers a registration of the communication node with the first core network element.
  • RRC radio resource control
  • the above-described methods are embodied in the form of processor-executable code and stored in a non-transitory computer-readable storage medium.
  • the code included in the computer readable storage medium when executed by a processor, causes the processor to implement the methods described in this patent document.
  • a device that is configured or operable to perform the above-described methods is disclosed.
  • FIG. 1 shows an architecture of 5G mobile communication system.
  • FIG. 2 shows a conventional technique for performing registration procedure with Access and Mobility Management function (AMF) relocation in the 5GS.
  • AMF Access and Mobility Management function
  • FIG. 3 shows an example flowchart of an Initial AMF sending to a user equipment (UE) a Registration Reject message that includes information about a Target AMF.
  • UE user equipment
  • FIG. 4 shows an example flowchart of a NG-RAN node sending to a UE a radio resource control (RRC) release message that includes information about a Target AMF.
  • RRC radio resource control
  • FIG. 5A shows a first exemplary flowchart for a network node to facilitate AMF relocation.
  • FIG. 5B shows a first exemplary flowchart for a communication node to facilitate AMF relocation.
  • FIG. 6A shows a second exemplary flowchart for a network node to facilitate AMF relocation.
  • FIG. 6B shows a second exemplary flowchart for a communication node to facilitate AMF relocation
  • FIG. 7 shows an exemplary block diagram of a hardware platform that may be a part of a network node or a communication node.
  • This patent document describes techniques for performing Access and Mobility Management function (AMF) relocation.
  • AMF Access and Mobility Management function
  • FIG. 1 shows an architecture of 5G mobile communication system.
  • the user equipment (UE) connects to the 5G network.
  • architecture shown in FIG. 1 includes the following devices and/or associated functions:
  • Access and Mobility Management function can include at least the following functionalities: Registration management, Connection management, Reachability management and Mobility Management. This function also performs the access authentication and access authorization.
  • the AMF is the non-access stratum (NAS) security termination and relay the SM (session management) NAS between UE and SMF,etc.
  • NAS non-access stratum
  • Session Management function can include at least the following functionalities: Session Management e.g. Session establishment, modification and release, UE IP address allocation &management (including optional Authorization) , Selection and control of UP function, downlink data notification, etc.
  • Session Management e.g. Session establishment, modification and release, UE IP address allocation &management (including optional Authorization) , Selection and control of UP function, downlink data notification, etc.
  • UPF User plane function
  • the UPF can include at least the following functionalities: Anchor point for Intra-/Inter-radio access technology (RAT) mobility, Packet routing & forwarding, Traffic usage reporting, QoS (Quality of service) handling for user plane, Downlink packet buffering and downlink data notification triggering, etc.
  • RAT Intra-/Inter-radio access technology
  • QoS Quality of service
  • Unified Data Management can include at least the following functionalities: Generation of 3GPP Authentication and Key Agreement (AKA) Authentication Credentials.
  • AKA 3GPP Authentication and Key Agreement
  • User Identification Handling e.g. storage and management of subscription permanent identifier (SUPI) for each subscriber in the 5G system
  • Subscription management etc.
  • AUSF Authentication Server Function
  • the AUSF can include at least the following functionalities: Support of authentication for 3GPP access.
  • FIG. 2 shows a conventional technique for performing registration procedure with AMF relocation in the 5GS.
  • FIG. 2 indicates a set of operations associated with a number that are further explained below using the same numbering scheme:
  • the UE sends Registration Request message to the NG-RAN, the Registration Request message includes the clear-texts information elements (IEs) (e.g., Registration type, subscription concealed identifier (SUCI) of the UE or 5G-globally unique temporary identifier (5G-GUTI) of the UE, Security parameters) .
  • IEs clear-texts information elements
  • SUCI subscription concealed identifier
  • 5G-GUTI 5G-globally unique temporary identifier
  • the NG-RAN will forward the Registration Request (RR) message to the initial AMF.
  • RR Registration Request
  • the initial AMF performs the Authentication procedure to generate the partial native 5G security context.
  • the initial AMF integrity protected Security Mode Command message and then the AMF sends the Security Mode Command message to take the partial native 5G security context to use.
  • the Security Mode Command message contains the next generation key set identifier (ngKSI) , a key (Kamf) and retransmission of the RR message required flag.
  • the UE sends the Security Mode Complete message to the AMF. In this message the entire Registration Request message will be included. Entire Registration Request will contain the clear-texts IE as in the step 1 and the non-clear-texts IE.
  • the non-clear-texts IE includes the requested network slice selection assistance information (NSSAI) and UE network capability.
  • the Initial AMF sends the Nnssf_NSSelection_Get message to Network Slice Selection Function (NSSF) .
  • the Nnssf_NSSelection_Get message includes Requested NSSAI, tracking area identifier (TAI) , and public land mobile network identifier (PLMN ID) of the subscription permanent identifier (SUPI) .
  • the NSSF sends to Initial AMF with Response to Nnssf_NSSelection_Get which includes AMF Set and Allowed NSSAI.
  • the initial AMF decides to forward the NAS message to the target AMF via (R) AN
  • the initial AMF sends a Reroute NAS message to the (R) AN.
  • the Reroute NAS message includes the information about the target AMF and the Registration Request message.
  • the RAN selects the target AMF based on the Reroute NAS message and send the Initial UE message to the target AMF.
  • the target AMF determines to perform the authentication procedure, and the AMF sends Nausf_UEAuthentication_Authenticate Request message to the AUSF. This message will include the SUPI.
  • the AUSF will return Nausf_UEAuthentication_Authenticate Response message. This message will include the authentication key or token (AUTN) and authentication sequence number (SQN) .
  • AUTN authentication key or token
  • SQL authentication sequence number
  • the target AMF sends the unprotected Authentication Request message to the UE and starts a timer to monitor the Authentication Response message.
  • the UE Since the security connection has been established between the UE and the initial AMF, the UE will discard the unprotected Authentication Request message.
  • the AMF will send the Registration Reject message to the UE.
  • the conventional flow diagram shown in FIG. 2 has at least the following technical problems. If the initial AMF and the UE have set up the security connection and the AMF relocation via RAN is performed, then when the target AMF sends the unprotected Authentication Request message to the UE, the UE will discard this unprotected Authentication Request message because the UE is in a secure connection with the initial AMF. In this scenario, the UE will not respond to the target AMF and the target AMF will, upon expiration of a timer, reject the Registration procedure so that the UE may not be able to get service from the NG-RAN node.
  • the Initial AMF sends to the UE a Registration Reject message that includes information about the target AMF.
  • the UE sends the target AMF information to the NG-RAN for the target AMF selection.
  • the target AMF performs the authentication procedure.
  • FIG. 3 shows an example flowchart of the Initial AMF sending to the UE a Registration Reject message that includes information about the target AMF.
  • a Registration Reject message indicates that the initial AMF rejects a UE’s registration with the initial AMF.
  • FIG. 3 indicates a set of operations associated with a number that are further explained below using the same numbering scheme:
  • the UE sends Registration Request message to the NG-RAN, the Registration Request message includes the clear-texts IEs (e.g., Registration type, SUCI or 5G-GUTI, Security parameters) .
  • the Registration Request message enables the UE to be registered with an AMF.
  • the NG-RAN will forward the Registration Request message to the initial AMF.
  • the initial AMF performs the Authentication procedure to generate the partial native 5G security context.
  • the initial AMF integrity protected Security Mode Command message and then the AMF sends the Security Mode Command message to take the partial native 5G security context to use.
  • the Security Mode Command message it contains the ngKSI, Kamf and retransmission of the RR message required flag.
  • the UE sends the Security Mode Complete message to the AMF. In this message the entire Registration Request message will be included. Entire Registration Request will contain the clear-texts IE as in the step 1 and the non-clear-texts IE.
  • the non-clear-texts IE includes the requested NSSAI and UE network capability.
  • the Initial AMF sends the Nnssf_NSSelection_Get message to the NSSF, theNnssf_NSSelection_Get message includes Requested NSSAI, TAI, and PLMN ID of the SUPI.
  • the NSSF sends to Initial AMF with Response to Nnssf_NSSelection_Get which includes AMF Set and Allowed NSSAI.
  • the initial AMF based on local policy and subscription information, decides to forward a NAS message to the target AMF, then the initial AMF sends a Registration Reject message to the UE.
  • the Registration Reject message includes the information about the target AMF, where the target AMF information can include a globally unique AMF identifier (GUAMI) of the target AMF.
  • GUI globally unique AMF identifier
  • UE sends the RRC Setup Complete (msg 5) to the NG-RAN.
  • the Registration Request message can also be carried as NAS protocol data unit (PDU) in the msg5.
  • PDU NAS protocol data unit
  • the RRC Setup Complete message can include the Registration Request message.
  • the msg 5 can also include the target AMF’s GUAMI.
  • the NG-RAN will forward the Registration Request message to the target AMF as part of the Initial UE message.
  • the target AMF determines to perform the authentication procedure, and the target AMF sends Nausf_UEAuthentication_Authenticate Request message to the AUSF. This message will include the SUPI.
  • the AUSF will return Nausf_UEAuthentication_Authenticate Response message to the target AMF. This message will include the AUTN and SQN.
  • the target AMF sends the unprotected Authentication Request message to the UE and starts a timer to monitor the Authentication response message.
  • the UE will send the Authentication Response message to the target AMF at least because the UE, upon receiving a Registration Reject message from the initial AMF (at Step 8) , does not have a security connection setup with the initial AMF.
  • the Authentication Response message can include the authentication code RES* (or authentication code result value) .
  • the target AMF will send Registration Accept message to the UE.
  • 5G-GUTI of the UE can be included in Registration Accept message.
  • the UE will send the Registration Complete message to the target AMF to acknowledge the reception of the 5G-GUTI.
  • the NG-RAN node sends to a UE a radio resource control (RRC) release message that includes information about the target AMF.
  • RRC radio resource control
  • the UE sends the target AMF information to the NG-RAN for the target AMF selection.
  • the target AMF performs the authentication procedure.
  • FIG. 4 shows an example flowchart of the NG-RAN node sending to a UE a RRC release message that includes information about the target AMF.
  • FIG. 4 indicates a set of operations associated with a number that are further explained below using the same numbering scheme:
  • the UE sends Registration Request message to the NG-RAN, the Registration Request message includes the clear-texts IEs (e.g., Registration type, SUCI or 5G-GUTI, Security parameters) .
  • the Registration Request message enables the UE to be registered with an AMF.
  • the NG-RAN will forward the Registration Request message to the initial AMF.
  • the initial AMF performs the Authentication procedure to generate the partial native 5G security context.
  • the initial AMF integrity protected Security Mode Command message and then the AMF sends the Security Mode Command message to take the partial native 5G security context to use.
  • the Security Mode Command message it contains the ngKSI, Kamf and retransmission of the RR message required flag.
  • the UE sends the Security Mode Complete message to the AMF. In this message the entire Registration Request message will be included. Entire Registration Request will contain the clear-texts IE as in the step 1 and the non-clear-texts IE.
  • the non-clear-texts IE includes the requested NSSAI and UE network capability.
  • the Initial AMF sends the Nnssf_NSSelection_Get message to NSSF, the Nnssf_NSSelection_Get includes Requested NSSAI, TAI, and PLMN ID of the SUPI) .
  • the NSSF sends to Initial AMF with Response to Nnssf_NSSelection_Get which includes AMF Set and Allowed NSSAI) .
  • the initial AMF decides to forward the NAS message to the target AMF via (R) AN
  • the initial AMF sends a Reroute NAS message to the (R) AN.
  • the Reroute NAS message enables the NG-RAN node to generate and/or send the Registration Request message as described in Step 10.
  • the Reroute NAS message includes the information about the target AMF (e.g., GUAMI of the target AMF, which is shown as “target GUAMI” in FIG. 4) and the Registration Request message.
  • the RAN performs the RRC release procedure.
  • the RAN will send the RRC release message to the UE, where the RRC release message can include the target AMF’s GUAMI.
  • the UE After receiving the RRC release message, the UE will release the RRC connection and release the existing NAS signaling connection.
  • the secure connection between the UE and the initial AMF is terminated
  • UE sends the RRC Setup Complete (msg 5) to the NG-RAN.
  • the Registration Request message can also be carried as NAS PDU in the msg5.
  • the RRC Setup Complete message can include the Registration Request message.
  • the msg 5 can also include the target AMF’s GUAMI.
  • the NG-RAN will forward the Registration Request message to the target AMF as part of the Initial UE message.
  • the target AMF determines to perform the authentication procedure, and the target AMF sends Nausf_UEAuthentication_Authenticate Request message to the AUSF. This message will include the SUPI.
  • the AUSF will return Nausf_UEAuthentication_Authenticate Response message. This message will include the AUTN and SQN.
  • the target AMF sends the unprotected Authentication Request message to the UE and starts a timer to monitor the Authentication response message.
  • the UE will send the Authentication Response message to the target AMF at least because the UE, upon receiving a RRC release message from the initial AMF (at Step 9) , does not have a security connection setup with the initial AMF.
  • the Authentication Response message can include the authentication code RES*.
  • the AMF will send Registration Accept message to the UE.
  • 5G-GUTI of the UE can be included in the Registration Accept message.
  • the UE will send the Registration Complete message to the AMF to acknowledge the reception of the 5G-GUTI.
  • FIG. 5A shows a first exemplary flowchart for a network node to facilitate AMF relocation.
  • a network node receives a first message (e.g., a RRC Setup Complete message) that indicates that a radio resource control (RRC) connection establishment is complete, where the first message is received in response to a rejection of a first registration by a first core network element with a communication node.
  • the rejection of a first registration may indicate a termination of a connection between a first core network element and the communication node.
  • the network node sends, to a second core network element and after receiving the first message, a second message (e.g., Registration Request message) that requests a second registration of the communication node with the second core network element, where the first message and the second message include the identifier of the second core network element.
  • a second message e.g., Registration Request message
  • the identifier of the second core network element includes a Globally Unique Access and Mobility management Function (AMF) identifier (GUAMI) of the second core network element.
  • the first message includes the second message in a non-access stratum (NAS) protocol data unit (PDU) .
  • the sending the second message includes sending an initial user equipment (UE) message that includes the second message.
  • the network node includes a base station, the communication node includes a user equipment (UE) , the first core network element includes a first Access and Mobility Management Function (AMF) , and the second core network element includes a second AMF.
  • an authentication procedure is triggered with the second core network element after sending the second message.
  • FIG. 5B shows a first exemplary flowchart for a communication node to facilitate AMF relocation.
  • a communication node receives a first message (e.g., Registration Reject message) that indicates a rejection of a first registration by a first core network element with the communication node.
  • the rejection of a first registration may indicate a termination of a connection between a first core network element and the communication node.
  • the communication node sends, to a network node after receiving the first message, a second message (e.g., RRC Setup Complete message) that indicates that radio resource control (RRC) connection establishment is complete, where the first message and the second message include an identifier of a second core network element, and where the sending the second message triggers a second registration of the communication node with the second core network element.
  • a second message e.g., RRC Setup Complete message
  • RRC radio resource control
  • the identifier of the second core network element includes a Globally Unique Access and Mobility management Function (AMF) identifier (GUAMI) of the second core network element.
  • the network node includes a base station
  • the communication node includes a user equipment (UE)
  • the first core network element includes a first Access and Mobility Management Function (AMF)
  • the second core network element includes a second AMF.
  • FIG. 6A shows a second exemplary flowchart for a network node to facilitate AMF relocation.
  • a network node receives, from a communication node, a first message (e.g., RRC Setup Complete message) that indicates that a radio resource control (RRC) connection establishment is complete.
  • RRC radio resource control
  • the network node sends, to a first core network element and after receiving the first message, a second message (e.g., Registration Request message) that requests a registration of the communication node with the first core network element, where the first message and the second message include an identifier of the first core network element.
  • a second message e.g., Registration Request message
  • the identifier of the first core network element includes a Globally Unique Access and Mobility management Function (AMF) identifier (GUAMI) of the first core network element.
  • the first message includes the second message in a non-access stratum (NAS) protocol data unit (PDU) .
  • the sending the second message includes sending an initial user equipment (UE) message that includes the second message.
  • the first message is received in response to the network node sending to the communication node a third message (e.g., RRC Release message) that indicates a release of RRC, and where the third message includes the identifier of the first core network element.
  • RRC Release message e.g., RRC Release message
  • the third message is sent in response to the network node receiving from a second core network element a non-access stratum (NAS) reroute request message that facilitate a generation or sending of the second message, and the NAS reroute request message includes the identifier of the first core network element.
  • the network node includes a base station
  • the communication node includes a user equipment (UE)
  • the first core network element includes a first Access and Mobility Management Function (AMF)
  • AMF Access and Mobility Management Function
  • FIG. 6B shows a second exemplary flowchart for a communication node to facilitate AMF relocation.
  • a communication node receives, from a network node, a first message (e.g., RRC Release message) that indicates release of radio resource control (RRC) .
  • RRC radio resource control
  • the communication node sends, to the network node and after receiving the first message, a second message (e.g., RRC Setup Complete message) that indicates that a RRC connection establishment is complete, where the first message and the second message include an identifier of a first core network element, and where the sending the second message triggers a registration of the communication node with the first core network element.
  • a first message e.g., RRC Release message
  • RRC radio resource control
  • the identifier of the first core network element includes a Globally Unique Access and Mobility management Function (AMF) identifier (GUAMI) of the first core network element.
  • the first message is received in response to a non-access stratum (NAS) reroute request message sent by a second core network element, and the NAS reroute request message includes the identifier of the first core network element.
  • the network node includes a base station, the communication node includes a user equipment (UE) , the first core network element includes a first Access and Mobility Management Function (AMF) , and the second core network element includes a second AMF.
  • FIG. 7 shows an exemplary block diagram of a hardware platform 700 that may be a part of a network node (e.g., base station or RAN node) or a communication node (e.g., UE) .
  • the hardware platform 700 includes at least one processor 710 and a memory 705 having instructions stored thereupon. The instructions upon execution by the processor 710 configure the hardware platform 700 to perform the operations described in FIGS. 3 to 6B and in the various embodiments described in this patent document.
  • the transmitter 715 transmits or sends information or data to another node.
  • a network node transmitter can send a message to a communication node.
  • the receiver 720 receives information or data transmitted or sent by another node.
  • a communication can receive a message from a network node.
  • a computer-readable medium may include removable and non-removable storage devices including, but not limited to, Read Only Memory (ROM) , Random Access Memory (RAM) , compact discs (CDs) , digital versatile discs (DVD) , etc. Therefore, the computer-readable media can include a non-transitory storage media.
  • program modules may include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types.
  • Computer-or processor-executable instructions, associated data structures, and program modules represent examples of program code for executing steps of the methods disclosed herein. The particular sequence of such executable instructions or associated data structures represents examples of corresponding acts for implementing the functions described in such steps or processes.
  • a hardware circuit implementation can include discrete analog and/or digital components that are, for example, integrated as part of a printed circuit board.
  • the disclosed components or modules can be implemented as an Application Specific Integrated Circuit (ASIC) and/or as a Field Programmable Gate Array (FPGA) device.
  • ASIC Application Specific Integrated Circuit
  • FPGA Field Programmable Gate Array
  • DSP digital signal processor
  • the various components or sub-components within each module may be implemented in software, hardware or firmware.
  • the connectivity between the modules and/or components within the modules may be provided using any one of the connectivity methods and media that is known in the art, including, but not limited to, communications over the Internet, wired, or wireless networks using the appropriate protocols.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

L'invention concerne des techniques de gestion de relocalisation de fonction de gestion d'accès et de mobilité (AMF). Une technique ayant valeur d'exemple comprend les étapes consistant à : recevoir, au moyen d'un nœud de réseau, un premier message indiquant qu'un établissement d'une connexion de contrôle de ressources radio (RRC) est exécuté, le premier message étant reçu en réponse à un rejet d'un premier enregistrement par un premier élément de réseau central avec un nœud de communication; et, après réception du premier message, envoyer à un second élément de réseau central un second message demandant un second enregistrement du nœud de communication avec le second élément de réseau central, les premier et second messages contenant l'identifiant du second élément de réseau central.
PCT/CN2020/073816 2020-01-22 2020-01-22 Techniques de gestion de relocalisation de fonction de gestion d'accès et de mobilité (amf) WO2021093182A1 (fr)

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PCT/CN2020/073816 WO2021093182A1 (fr) 2020-01-22 2020-01-22 Techniques de gestion de relocalisation de fonction de gestion d'accès et de mobilité (amf)
CN202080093124.2A CN114946231A (zh) 2020-01-22 2020-01-22 管理接入和移动性管理功能(amf)重定位的技术

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