WO2020217224A1 - Comportement amf et scp dans la découverte déléguée de pcf - Google Patents

Comportement amf et scp dans la découverte déléguée de pcf Download PDF

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Publication number
WO2020217224A1
WO2020217224A1 PCT/IB2020/053895 IB2020053895W WO2020217224A1 WO 2020217224 A1 WO2020217224 A1 WO 2020217224A1 IB 2020053895 W IB2020053895 W IB 2020053895W WO 2020217224 A1 WO2020217224 A1 WO 2020217224A1
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Prior art keywords
pcf
request
response
create
scp
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PCT/IB2020/053895
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English (en)
Inventor
Magnus HALLENSTÅL
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Telefonaktiebolaget Lm Ericsson (Publ)
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Publication of WO2020217224A1 publication Critical patent/WO2020217224A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/14—Session management
    • H04L67/141—Setup of application sessions
    • 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
    • H04W8/12—Mobility data transfer between location registers or mobility servers

Definitions

  • the present disclosure relates to a core network of a cellular
  • PCF Policy Control Function
  • AM Access and Mobility
  • UE User Equipment
  • NF Network Function
  • NRF Network Resource Function
  • NF producers as NF consumers to the NRF, register their NF profile in the NRF.
  • the NF profile contains NF specific information, service instances, addresses to the service instances, etc. (see 3GPP Technical Specification (TS) 29.510 for details).
  • TS Technical Specification
  • indirect communication is introduced.
  • SCPs Service Communication Proxies
  • Option C Indirect communication without delegated discovery: Consumers do discovery by querying the NRF. Based on discovery result, the consumer does the selection of an NF instance of NF Service instance set The consumer sends the request to the SCP containing the address of the selected service producer pointing to a NF service instance or a set of NF service instances. In the latter case, the
  • SCP selects an NF Service instance. If possible, the SCP interacts with
  • NRF NRF to get selection parameters such as location, capacity, etc.
  • SCP routes the request to the selected NF service producer instance.
  • the consumer adds any necessary discovery and selection parameters required to fmd a suitable producer to the service request.
  • the SCP uses the request address and the discovery and selection parameters in the request message to route the request to a suitable producer instance.
  • the SCP can perform discovery with an NRF and obtain a discovery result.
  • PCF Policy Control Function
  • AMF Access and Mobility Management Function
  • AMF shall select the same PCF NF instance for User Equipment (UE) and Access and Mobility (AM) policy associations.
  • UE User Equipment
  • AM Access and Mobility
  • AMF in Visited Public Land Mobile Network may select a PCF in Home Public Land Mobile Network (HPLMN) and send the address to the Visited PCF (V- PCF) (PCF in VPLMN) for UE policies.
  • V- PCF Visited PCF
  • AMF may send the PCF ID to Session Management Function (SMF) when
  • Protocol Data Unit (PDU) session.
  • a method for delegated PCF discovery for a roaming scenario in a wireless communication system comprises, at an Access and Mobility Management Function (AMF), sending a first request to a Service Communication Proxy (SCP) to create an Access and Mobility (AM) policy association where the first request comprises an indication that a Home PCF (H- PCF) is needed, and receiving a response to the first request from the SCP where the response comprises an identifier of a selected Visited PCF (V-PCF) and an identifier of a selected H-PCF.
  • AMF Access and Mobility Management Function
  • SCP Service Communication Proxy
  • AM Access and Mobility
  • the method further comprises, at the SCP, receiving the first request from the AMF to create the AM policy association, discovering and selecting the H-PCF, discovering and selecting the V-PCF, sending a second request to the V-PCF to create the AM policy association, receiving a response to the second request from the V-PCF, and sending the response to the first request to the AMF where the response to the first request comprises the identifier of the V-PCF and the identifier of the FI-PCF.
  • a method performed by an AMF for delegated PCF discovery for a roaming scenario in a wireless communication system comprises sending a first request to a SCP to create an AM policy association.
  • the first request comprises an indication that a FI- PCF is needed.
  • the method further comprises receiving a response to the first request from the SCP, where the response comprises an identifier of a selected V-PCF and an identifier of a selected FI-PCF.
  • the method further comprises sending a second request to the SCP to create User Equipment (UE) policies, where the second request comprises the identifier of the selected V-PCF and the identifier of the selected FI-PCF, and receiving a response to the second request from the SCP.
  • the second request is a UE Policy Control Create.
  • the identifier of the selected FI-PCF is comprised in a message body of the second request.
  • the identifier of the selected V-PCF is comprised in discovery and selection parameters of the second request.
  • the actions of sending the first request, receiving the response to the first request, sending the second request, and receiving the response to the second request are performed during a PCF discovery procedure in which PCF discovery is delegated to the SCP.
  • the first request is an AM Policy Control Create.
  • the actions of sending the first request and receiving the response to the first request are performed during a PCF discovery procedure in which PCF discovery is delegated to the SCP.
  • a network node that implements an AMF is adapted to send a first request to a SCP to create an AM policy association, where the first request comprises an indication that a FI-PCF is needed.
  • the network node is further adapted to receive a response to the first request from the SCP, where the response comprises an identifier of a selected V-PCF and an identifier of a selected H- PCF (228).
  • the network node comprises processing circuitry configured to cause the network node to send the first request to the SCP to create the AM policy association and receive the response to the first request from the SCP.
  • a method performed by a SCP for delegated PCF discovery for a roaming scenario in a wireless communication system comprises receiving a first request from an AMF to create an AM policy association, where the first request comprises an indication that a H-PCF is needed.
  • the method further comprises discovering and selecting a H- PCF, discovering and selecting a V-PCF, and sending a second request to the selected V- PCF to create the AM policy association.
  • the method further comprises receiving a response to the second request from the V-PCF and sending a response to the first request to the AMF, where the response to the first request comprises an identifier of the selected V-PCF and an identifier of the selected FI-PCF.
  • the method further comprises receiving a third request from the AMF to create UE policies, where the third request comprises the identifier of the selected V-PCF and the identifier of the selected FI-PCF, and sending a fourth request to the selected V-PCF to create the UE policies, where the fourth request comprises the identifier of the selected FI-PCF.
  • the method further comprises receiving a fifth request from the selected V-PCF to create the UE policies, where the fifth request comprises the identifier of the selected FI-PCF, and obtaining the UE policies from a core network of a Flome Public Land Mobile Network (FIPLMN) in which the selected FI-PCF is located.
  • FIPLMN Flome Public Land Mobile Network
  • the method further comprises sending a response to the fifth request to the selected V-PCF where the response to the fifth request comprising the UE policies, receiving a response to the fourth request from the selected V-PCF where the response to the fourth request comprises the UE policies, and sending a response to the third request to the AMF where the response to the third request comprises the UE policies.
  • the fifth request is a UE Policy Control Create.
  • the third request is a UE Policy Control Create
  • the fourth request is a UE Policy Control Create.
  • the first request is an AM Policy Control Create
  • the second request is an AM Policy Control Create service operation.
  • the method is performed during a PCF discovery procedure in which PCF discovery is delegated to the SCP.
  • a network node that implements a SCP is also disclosed.
  • a network node that implements a SCP for delegated PCF discovery for a roaming scenario in a wireless communication system is adapted to receive a first request from an AMF to create an AM policy association, where the first request comprises an indication that a FI-PCF is needed.
  • the network node is further adapted to discover and select a FI-PCF, discover and select a V-PCF, send a second request to the selected V-PCF to create the AM policy association, receive a response to the second request from the V-PCF, and send a response to the first request to the AMF, where the response to the first request comprises an identifier of the selected V-PCF and an identifier of the selected FI-PCF.
  • the network node comprises processing circuitry configured to cause the network node to receive the first request from the AMF to create the AM policy association, discover and select the FI-PCF, discover and select the V-PCF, send the second request to the selected V-PCF to create the AM policy association, receive the response to the second request from the V-PCF, and send the response to the first request to the AMF.
  • Figure 1 illustrates one example of a cellular communications system in which embodiments of the present disclosure may be implemented
  • FIG. 2 illustrates a Fifth Generation System (5GS) architecture for a roaming scenario with local breakout in which embodiments of the present disclosure may be implemented;
  • 5GS Fifth Generation System
  • Figure 3 illustrates the operation of various core network entities to provide delegated discovery of a Policy Control Function (PCF) for Access and Mobility (AM) and User Equipment (UE) policies with delegated discovery in accordance with some embodiments of the present disclosure
  • PCF Policy Control Function
  • AM Access and Mobility
  • UE User Equipment
  • Radio Node As used herein, a "radio node” is either a radio access node or a wireless device.
  • Radio Access Node As used herein, a "radio access node” or “radio network node” is any node in a radio access network of a cellular communications network that operates to wirelessly transmit and/or receive signals.
  • a radio access node include, but are not limited to, a base station (e.g., a New Radio (NR) base station (gNB) in a 3GPP 5G NR network or an enhanced or evolved Node B (eNB) in a 3GPP Long Term Evolution (LTE) network), a high-power or macro base station, a low-power base station (e.g., a micro base station, a pico base station, a home eNB, or the like), and a relay node.
  • NR New Radio
  • gNB New Radio
  • eNB enhanced or evolved Node B
  • LTE Long Term Evolution
  • Core Network Entity is any type of entity in a core network.
  • a core network entity may also sometimes be referred to herein as a "core network node”.
  • Some examples of a core network entity include, e.g., a Mobility Management Entity (MME), a Packet Data Network Gateway (P-GW), a Service Capability Exposure Function (SCEF), or the like in an Evolved Packet Core (EPC).
  • MME Mobility Management Entity
  • P-GW Packet Data Network Gateway
  • SCEF Service Capability Exposure Function
  • a core network entity includes network functions (NFs) such as, e.g., an Access and Mobility Management Function (AMF), a Network Slice Selection Function (NSSF), an Authentication Server Function (AUSF), a UDM, a Session Management Function (SMF), a Policy Control Function (PCF), an AF, a NEF, a User Plane Function (UPF), or the like in a 5G Core (5GC).
  • NFs network functions
  • AMF Access and Mobility Management Function
  • NSSF Network Slice Selection Function
  • AUSF Authentication Server Function
  • UDM Session Management Function
  • PCF Policy Control Function
  • AF AF
  • NEF User Plane Function
  • UPF User Plane Function
  • a core network entity may be implemented as a physical network node (e.g., including hardware or a combination of hardware and software) or implemented as a functional entity (e.g., as software) that is, e.g., implemented on a physical network node or distributed across two or more physical network no
  • Wireless Device As used herein, a "wireless device” is any type of device that has access to a cellular communications network by wirelessly transmitting and/or receiving signals to a radio access node(s). Some examples of a wireless device include, but are not limited to, a User Equipment device in a 3GPP network and a Machine Type Communication device.
  • Network Node As used herein, a "network node” is any node that is either part of the radio access network or the core network of a cellular communications network/system.
  • 3GPP terminology or terminology similar to 3GPP terminology is oftentimes used.
  • the concepts disclosed herein are not limited to a 3GPP system.
  • an AMF sends discovery and selection parameters to an SCP.
  • the SCP selects a target NF instance and NF service instance.
  • the AMF starts with establishing Access and Mobility (AM) policies and indicates to the SCP that an H-PCF is needed (e.g., for UE policies).
  • the SCP discovers a PCF in the Visited Public Land Mobile Network (VPLMN) (i.e., a V-PCF) and an H-PCF in Home Public Land Mobile Network (HPLMN).
  • VPN Visited Public Land Mobile Network
  • HPLMN Home Public Land Mobile Network
  • the SCP In the response to the establishment, the SCP adds the H-PCF ID and PCF ID.
  • the AMF then establishes UE policies, adds the H-PCF ID received in the request body (a parameter among others), and indicates in the discovery and selection parameters the PCF ID that is to be used as V-PCF.
  • the SCP receives the message including a PCF ID, it will select the PCF with that PCF ID.
  • Some embodiments of the present disclosure relate to the order in which the AMF sets up its policy association, the SCP adding PCF ID of both FI-PCF and V-PCF in a first response, and/or the V-PCF adding FI-PCF ID as a discovery and selection parameter.
  • Embodiments of the present disclosure enable delegated discovery of PCF for AM and UE policies to work with delegated discovery.
  • Figure 1 illustrates one example of a cellular communications system 100 according to some embodiments of the present disclosure.
  • the cellular communications system 100 is a 5G system that includes a 5G NR radio access network (RAN).
  • the 5G NR RAN includes base stations 102-1 and 102-2, which in 5G NR are referred to as gNBs, controlling corresponding (macro) cells 104-1 and 104-2.
  • the base stations 102-1 and 102-2 are generally referred to herein collectively as base stations 102 and individually as base station 102.
  • the cells 104-1 and 104-2 are generally referred to herein collectively as cells 104 and individually as cell 104.
  • the 5G NR RAN may also include a number of low power nodes 106-1 through 106-4 controlling corresponding small cells 108-1 through 108-4.
  • the low power nodes 106-1 through 106-4 can be small base stations (such as pico or femto base stations) or Remote Radio Fleads (RRFIs), or the like.
  • RRFIs Remote Radio Fleads
  • one or more of the small cells 108-1 through 108-4 may alternatively be provided by the base stations 102.
  • the low power nodes 106-1 through 106-4 are generally referred to herein collectively as low power nodes 106 and individually as low power node 106.
  • the small cells 108-1 through 108-4 are generally referred to herein collectively as small cells 108 and individually as small cell 108.
  • the cellular communications system 100 also includes a core network 110, which in the 5G system is referred to as the 5G core.
  • the base stations 102 (and optionally the low power nodes 106) are connected to the
  • the base stations 102 and the low power nodes 106 provide service to wireless devices 112-1 through 112-5 in the corresponding cells 104 and 108.
  • the wireless devices 112-1 through 112-5 are generally referred to herein collectively as wireless devices 112 and individually as wireless device 112.
  • the wireless devices 112 are also sometimes referred to herein as UEs.
  • Figure 2 illustrates a 5G network architecture for the roaming local-breakout scenario using service-based interfaces between the NFs in the control plane.
  • the service(s) etc. that a NF provides to other authorized NFs can be exposed to the authorized NFs through the service-based interface.
  • FIG 2 is one example of the wireless communication system 100 of Figure 1.
  • the architecture includes a Visited Public Land Mobile Network (VPLMN) 200 including the UE(s) 112, the RAN nodes 102, and a number of core network functions.
  • VPN Visited Public Land Mobile Network
  • These core network functions include an AMF 202, an SMF 204, an NSSF 206, a NEF
  • the 5G network architecture of Figure 2 also includes a Home Public Land Mobile Network
  • HPLMN HPLMN 220 that includes a UDM 222, a NRF 224, an AUSF 226, a PCF 228 (also referred to herein as a "home PCF” or "H-PCF”), a NEF 230, and a home Security Edge
  • the VPLMN 200 may also include a Service Communication
  • the Service Communication Proxy includes one or more of the following functionalities. Some or all of the SCP functionalities may be supported in a single instance of an SCP:
  • the SCP may be deployed in a distributed manner.
  • NOTE 3 More than one SCP can be present in the communication path between NF Services.
  • An NF may be implemented either as a network element on a dedicated hardware, as a software instance running on a dedicated hardware, or as a virtualized function instantiated on an appropriate platform, e.g., a cloud infrastructure.
  • Figure 3 illustrates the operation of various core network entities to provide delegated discovery of a PCF for AM and UE policies with delegated discovery in accordance with some embodiments of the present disclosure. The steps of Figure 3 are described below.
  • the AMF 202 adds Discovery and selection parameters (S-NSSAIs, SUPI, H-PCF- flag). More specifically, when performing PCF discovery and selection for the UE 112, the AMF 202 sends an Npcf_AMPolicyControl Create message to the SCP 234 in order to create an AM policy association. In this example, the AMF 202 adds discovery and selection parameters (S-NSSAIs, SUPI, H-PCF-flag in this example) to the Npcf_AMPolicyControl Create message. In some embodiments, the H-PCF-flag provides an indication to the SCP 234 that the H-PCF 228 is needed (e.g., for UE policies). In this manner, the AMF 202 initiates
  • the AMF 202 may decide that the H-PCF 228 is needed based on operator policies.
  • the SCP 234 discovers the V-PCF 212 in the VPLMN 200 and the H-PCF 228 in the HPLMN 220 (e.g., using conventional methods). The SCP 234 selects the H- PCF 228.
  • the SCP 234 selects the V-PCF 212 and sends, to the selected V-PCF 212, an Npcf_AMPolicyControl_Create service operation message in order to create the AM policy association.
  • Npcf_AMPolicyControl Response The V-PCF 212 sends an Npcf_AMPolicyControl Response message to the SCP 234.
  • the SCP 234 adds extra parameters (V-PCF ID, H-PCF ID). More specifically, the SCP 234 sends an Npcf_AMPolicyControl Response message to the AMF 202. In this example, the SCP 234 includes additional parameters (V-PCF ID of the selected V-PCF 228 and H-PCF ID of the selected H-PCF 212) in the
  • the AMF 202 puts H-PCF ID in message Body
  • the AMF 202 adds Discovery and selection parameters (V-PCF ID)
  • the AMF 202 sends an Npcf_UEPolicyControl Create message to the SCP 234 in order to create a UE policy association, where the
  • NpcfJJEPolicyControl Create message includes the H-PCF ID received by the AMF 202 from the SCP 234 in step 5.
  • the AMF 202 adds discovery and selection parameters (V-PCF ID), e.g., into the
  • the SCP 234 selects the V-PCF 212 with received V-PCF ID
  • the SCP 234 selects the V-PCF 212 with the V-PCF ID received in step 6 and sends, to the selected V-PCF 212, an Npcf_UEPolicyControl Create message including the H-PCF ID in order to create the UE policy association.
  • the V-PCF 212 adds Discovery and Selection parameters (H-PCF ID)
  • the V-PCF 212 sends an Npcf_UEPolicyControl Create message to the SCP 234, where the V-PCF 212 includes discovery and selection
  • H-PCF ID e.g., into the Npcf_UEPolicyControl Create message.
  • the SCP 234 forwards the UE Policy Control Create request to the HPLMN 220 according to known principles and receives a response.
  • the response includes the UE policies.
  • NpcfJJEPolicyControl Response In response to the Npcf_UEPolicyControl Create of step 8, the SCP 234 sends an Npcf_UEPolicyControl Response to the V-PCF 212 including the UE policies.
  • NpcfJJEPolicyControl Response In response to the Npcf_UEPolicyControl Create of step 7, the V-PCF 212 sends an Npcf_UEPolicyControl Response to the SCF 234 including the UE policies.
  • FIG. 4 is a schematic block diagram of a network node 400 according to some embodiments of the present disclosure.
  • the network node 400 may be a radio access node (e.g., a base station) or a network node 400 that implements a core network entity (e.g., AMF, SCF, V-PCF, FI-PCF, or the like).
  • a radio access node e.g., a base station
  • a network node 400 that implements a core network entity (e.g., AMF, SCF, V-PCF, FI-PCF, or the like).
  • the network node 400 includes a control system 402 that includes one or more processors 404 (e.g., Central Processing Units (CPUs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs), and/or the like), memory 406, and a network interface 408.
  • processors 404 e.g., Central Processing Units (CPUs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs), and/or the like
  • the one or more processors 404 are also referred to herein as processing circuitry.
  • the network node 400 may also include one or more radio units 410 that each includes one or more transmitters 412 and one or more receivers 414 coupled to one or more antennas 416.
  • the radio units 410 may be referred to or be part of radio interface circuitry.
  • the radio unit(s) 410 is external to the control system 402 and connected to the control system 402 via, e.g., a wired connection (e.g., an optical cable).
  • the radio unit(s) 410 and potentially the antenna(s) 416 are integrated together with the control system 402.
  • the one or more processors 404 operate to provide one or more functions of a network node 400 as described herein (e.g., one or more functions of an AMF, SCF, V- PCF, or FI-PCF as described herein, e.g., with respect to Figure 3).
  • a network node 400 e.g., one or more functions of an AMF, SCF, V- PCF, or FI-PCF as described herein, e.g., with respect to Figure 3.
  • the function(s) are implemented in software that is stored, e.g., in the memory 406 and executed by the one or more processors 404.
  • Figure 5 is a schematic block diagram that illustrates a virtualized
  • a "virtualized" network node is an implementation of the network node 400 in which at least a portion of the functionality of the network node 400 is implemented as a virtual component(s) (e.g., via a virtual machine(s) executing on a physical processing node(s) in a network(s)).
  • the network node 400 includes one or more processing nodes 500 coupled to or included as part of a network(s) 502.
  • Each processing node 500 includes one or more processors 504 (e.g., CPUs, ASICs, FPGAs, and/or the like), memory 506, and a network interface 508.
  • the network node 400 may also include the control system 402 and/or the one or more radio units 410, as described above.
  • functions 510 of the network node 400 described herein are implemented at the one or more processing nodes 500 or distributed across the control system 402 and the one or more processing nodes 500 in any desired manner.
  • some or all of the functions 510 of the network node 400 described herein are implemented as virtual components executed by one or more virtual machines implemented in a virtual environ ment(s) hosted by the processing node(s) 500.
  • a computer program including instructions which, when executed by at least one processor, causes the at least one processor to carry out the functionality of the network node 400 (e.g., one or more functions of an AMF, SCF, V-PCF, or H-PCF as described herein, e.g., with respect to Figure 3) or a node (e.g., a processing node 500) implementing one or more of the functions 510 of the network node 400 (e.g., one or more functions of an AMF, SCF, V-PCF, or H-PCF as described herein, e.g., with respect to Figure 3) in a virtual environment according to any of the embodiments described herein is provided.
  • a node e.g., a processing node 500
  • a carrier comprising the aforementioned computer program product.
  • the carrier is one of an electronic signal, an optical signal, a radio signal, or a computer readable storage medium (e.g., a non-transitory computer readable medium such as memory).
  • FIG. 6 is a schematic block diagram of the network node 400 according to some other embodiments of the present disclosure.
  • the network node 400 includes one or more modules 600, each of which is implemented in software.
  • the module(s) 600 provide the functionality of the network node 400 described herein (e.g., one or more functions of an AMF, SCF, V-PCF, or H-PCF as described herein, e.g., with respect to Figure 3).
  • This discussion is equally applicable to the processing node 500 of Figure 5 where the modules 600 may be implemented at one of the processing nodes 500 or distributed across multiple processing nodes 500 and/or distributed across the processing node(s) 500 and the control system 402.
  • any appropriate steps, methods, features, functions, or benefits disclosed herein may be performed through one or more functional units or modules of one or more virtual apparatuses.
  • Each virtual apparatus may comprise a number of these functional units.
  • These functional units may be implemented via processing circuitry, which may include one or more microprocessor or microcontrollers, as well as other digital hardware, which may include Digital Signal Processor (DSPs), special-purpose digital logic, and the like.
  • the processing circuitry may be configured to execute program code stored in memory, which may include one or several types of memory such as Read Only Memory (ROM), Random Access Memory (RAM), cache memory, flash memory devices, optical storage devices, etc.
  • Program code stored in memory includes program instructions for executing one or more telecommunications and/or data communications protocols as well as instructions for carrying out one or more of the techniques described herein.
  • the processing circuitry may be used to cause the respective functional unit to perform corresponding functions according one or more embodiments of the present disclosure.
  • Embodiment 1 A method performed by an Access and Mobility Management Function, AMF, for delegated Policy Control Function, PCF, discovery for a roaming scenario in a wireless communication system, comprising one or more of the following actions: sending (Fig. 3, 1) a first request to a Service Communication Proxy, SCP, to create Access and Mobility, AM, policies, the first request comprising an indication that a Flome PCF, H-PCF, is needed for User Equipment, UE, policies; and receiving (Fig. 3, 5) a response to the first request from the SCP, the response comprising an identifier of a selected Visited PCF, V-PCF, and an identifier of a selected FI-PCF.
  • AMF Access and Mobility Management Function
  • PCF Policy Control Function
  • Embodiment 2 The method of embodiment 1 further comprising: sending (Fig. 3, 6) a second request to the SCP to create UE policies, the second request comprising the identifier of the selected V-PCF and the identifier of the selected H-PCF; and receiving (Fig. 3, 12) a response to the second request from the SCP.
  • Embodiment 3 The method of embodiment 2 wherein the second request is a UE Policy Control Create.
  • Embodiment 4 The method of any one of embodiments 1 to 3 wherein the actions of sending the first request and receiving the response to the first request, sending the second request, and receiving the response to the second request are performed during a PCF discovery procedure in which PCF discovery is delegated to the SCP.
  • Embodiment 5 The method of any one of embodiments 1 to 4 wherein the first request is an AM Policy Control Create.
  • Embodiment 6 The method of any one of embodiments 1 to 5 wherein the actions of sending the first request and receiving the response to the first request are performed during a PCF discovery procedure in which PCF discovery is delegated to the SCP.
  • Embodiment 7 A method performed by a Service Communication Proxy, SCP, for delegated Policy Control Function, PCF, discovery for a roaming scenario in a wireless communication system, comprising one or more of the following actions: receiving (Fig. 3, 1) a first request from an Access and Mobility Management Function, AMF, to create Access and Mobility, AM, policies, the first request comprising an indication that a Home PCF, H-PCF, is needed for User Equipment, UE, policies;
  • discovering and selecting (Fig. 3, 2) an H-PCF; discovering and selecting (Fig. 3, 2-3) a V-PCF; sending (Fig. 3, 3) a second request to the selected V-PCF to create the AM policies; receiving (Fig. 3, 4) a response to the second request from the V-PCF, the response to the second request comprising the AM policies; sending (Fig. 3, 5) a response to the first request to the AMF, the response to the first request comprising the AM policies, an identifier of the selected V-PCF, and an identifier of the selected H- PCF.
  • Embodiment 8 The method of embodiment 7 further comprising: receiving (Fig. 3, 6) a third request from the AMF 6o create UE policies, the third request comprising the identifier of the selected V-PCF and the identifier of the selected H-PCF; sending (Fig. 3, 7) a fourth request to the selected V-PCF to create the UE policies, the fourth request comprising the identifier of the selected H-PCF.
  • Embodiment 9 The method of embodiment 8 further comprising: receiving (Fig. 3, 8) a fifth request from the selected V-PCF to create the UE policies, the fifth request comprising the identifier of the selected H-PCF; obtaining (Fig. 3, 9) the UE policies from a core network of a Home Public Land Mobile Network, HPLMN, in which the H-PCF is located.
  • Embodiment 10 The method of embodiment 9 further comprising: sending (Fig. 3, 10) a response to the fifth request to the selected V-PCF, the response to the fifth request comprising the UE policies; receiving (Fig. 3, 11) a response to the fourth request from the selected V-PCF, the response to the fourth request comprising the UE policies; and sending (Fig. 3, 12) a response to the third request to the AMF, the response to the third request comprising the UE policies.
  • Embodiment 11 The method of embodiment 9 or 10 wherein the fifth request is a UE Policy Control Create.
  • Embodiment 12 The method of any one of embodiments 8 to 11 wherein the third request is a UE Policy Control Create, and the fourth request is a UE Policy Control Create.
  • Embodiment 13 The method of any one of embodiments 7 to 12 wherein the first request is an AM Policy Control Create, and the second request is an AM Policy Control Create service operation.
  • Embodiment 14 The method of any one of embodiments 7 to 13 wherein the method is performed during a PCF discovery procedure in which PCF discovery is delegated to the SCP.
  • Embodiment 15 A network node for delegated Policy Control Function, PCF, discovery for a roaming scenario in a wireless communication system, the network node implementing a core network entity adapted to perform the method of any one of embodiments 1 to 14.
  • PCF Policy Control Function
  • Embodiment 16 A network node for delegated Policy Control Function, PCF, discovery for a roaming scenario in a wireless communication system, comprising: a network interface (408, 508); and processing circuitry (404, 504) associated with the network interface (408, 508), the processing circuitry (404, 504) configured to cause the network node to perform the method of any one of embodiments 1 to 14.
  • PCF Policy Control Function

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne des systèmes et des procédés relatifs à la découverte de fonction de commande de politique (PCF) déléguée dans un système de communication cellulaire. Dans un mode de réalisation, un procédé de découverte de PCF déléguée pour un scénario d'itinérance comprend, au niveau d'une fonction d'accès et de gestion de mobilité (AMF), l'envoi d'une première demande à un mandataire de communication de service (SCP) afin de créer une association de politiques d'accès et de mobilité (AM), la première demande comprenant une indication selon laquelle une PCF domestique (H-PCF) est nécessaire. Le procédé comprend en outre, au niveau du SCP, la réception de la première demande provenant de l'AMF, la découverte et la sélection de la H-PCF et d'une PCF visitée (V-PCF), l'envoi d'une seconde demande à la V-PCF afin de créer l'association de politiques d'AM, la réception d'une réponse à la seconde demande provenant de la V-PCF, et l'envoi d'une réponse à la première demande à l'AMF comprenant l'identifiant de la V-PCF et l'identifiant de la H-PCF.
PCT/IB2020/053895 2019-04-26 2020-04-24 Comportement amf et scp dans la découverte déléguée de pcf WO2020217224A1 (fr)

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WO2022152406A1 (fr) * 2021-01-14 2022-07-21 Telefonaktiebolaget Lm Ericsson (Publ) Demande de découverte et gestion de réponse
WO2022157734A1 (fr) * 2021-01-22 2022-07-28 Telefonaktiebolaget Lm Ericsson (Publ) Fonction de réseau rvas pour hplmn
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