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EP-4736542-A1 - METHOD AND APPARATUS FOR SUPPORTING ROAMING SERVICE TRAFFIC ROUTING IN MOBILE COMMUNICATION SYSTEM

EP4736542A1EP 4736542 A1EP4736542 A1EP 4736542A1EP-4736542-A1

Abstract

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by an access and mobility management function (AMF) in a communication system includes receiving, from a user equipment (UE), a registration request message, receiving, from a unified data management (UDM), subscription information for session management function (SMF) selection including an identifier (ID) of a target public land mobile network (PLMN) for traffic routing, and selecting an SMF for traffic routing in the target PLMN based on the ID of the target PLMN included in the subscription information.

Inventors

  • KIM, HYESUNG
  • LEE, JICHEOL

Assignees

  • Samsung Electronics Co., Ltd.

Dates

Publication Date
20260506
Application Date
20240816

Claims (15)

  1. A method performed by an access and mobility management function (AMF) in a communication system, the method comprising: receiving, from a user equipment (UE), a registration request message; receiving, from a unified data management (UDM), subscription information for session management function (SMF) selection including an identifier (ID) of a target public land mobile network (PLMN) for traffic routing; and selecting an SMF for traffic routing in the target PLMN based on the ID of the target PLMN included in the subscription information.
  2. The method of claim 1, wherein the selecting of the SMF for traffic routing in the target PLMN comprises: transmitting, to a visited-network repository function (v-NRF), a network function (NF) discovery request message for SMF selection including the ID of the target PLMN; and receiving, from the v-NRF, an NF discovery response message including information on the SMF for traffic routing in the target PLMN.
  3. The method of claim 1, wherein the subscription information is associated with per single-network slice selection assistance information (S-NSSAI) or per data network name (DNN).
  4. The method of claim 1, further comprising: transmitting, to an SMF in a visited PLMN, the information on the SMF for traffic routing in the target PLMN.
  5. A method performed by a visited-network repository function (v-NRF) in a communication system, the method comprising: receiving, from an access and mobility management function (AMF), a first network function (NF) discovery request message for session management function (SMF) selection including an identifier (ID) of a target public land mobile network (PLMN) for traffic routing; transmitting, to a home-network repository function (h-NRF), a second NF discovery request message including the ID of the target PLMN; receiving, from h-NRF, a first NF discovery request response message including information on an SMF for traffic routing in the target PLMN; and transmitting, to the AMF, a second NF discovery request response message including information on the SMF for traffic routing in the target PLMN.
  6. The method of claim 5, wherein the h-NRF is identified based on identifier information of a user equipment (UE).
  7. A method performed by a home-network repository function (h-NRF) in a communication system, the method comprising: receiving, from a visited- network repository function (v-NRF), a first network function (NF) discovery request message including an identifier (ID) of a target public land mobile network (PLMN) for traffic routing; identifying an SMF for traffic routing in the target PLMN based on the ID of the target PLMN; and transmitting, to the v-NRF, a first NF discovery request response message including information on the SMF for traffic routing in the target PLMN.
  8. The method of claim 7, wherein the identifying of the SMF for traffic routing in the target PLMN comprises: transmitting, to an NRF in the target PLMN, a second NF discovery request based on a configuration in the h-NRF; and receiving, from the NRF in the target PLMN, a second NF discovery request response message including information on the SMF for traffic routing in the target PLMN.
  9. An access and mobility management function (AMF) in a communication system, the AMF comprising: a transceiver; and a controller coupled with the transceiver and configured to: receive, from a user equipment (UE), a registration request message, receive, from a unified data management (UDM), subscription information for session management function (SMF) selection including an identifier (ID) of a target public land mobile network (PLMN) for traffic routing, and select an SMF for traffic routing in the target PLMN based on the ID of the target PLMN included in the subscription information.
  10. The AMF of claim 9, wherein, to select the SMF for traffic routing in the target PLMN, the controller is configured to: transmit, to a visited-network repository function (v-NRF), a network function (NF) discovery request message for SMF selection including the ID of the target PLMN; and receive, from the v-NRF, an NF discovery response message including information on the SMF for traffic routing in the target PLMN.
  11. The AMF of claim 9, wherein the subscription information is associated with per single-network slice selection assistance information (S-NSSAI) or per data network name (DNN), and wherein the controller is further configured to transmit, to an SMF in a visited PLMN, the information on the SMF for traffic routing in the target PLMN.
  12. A visited-network repository function (v-NRF) in a communication system, the v-NRF comprising: a transceiver; and a controller coupled with the transceiver and configured to: receive, from an access and mobility management function (AMF), a first network function (NF) discovery request message for session management function (SMF) selection including an identifier (ID) of a target public land mobile network (PLMN) for traffic routing, transmit, to a home-network repository function (h-NRF), a second NF discovery request message including the ID of the target PLMN, receive, from h-NRF, a first NF discovery request response message including information on an SMF for traffic routing in the target PLMN, and transmit, to the AMF, a second NF discovery request response message including information on the SMF for traffic routing in the target PLMN.
  13. The v-NRF of claim 12, wherein the h-NRF is identified based on identifier information of a user equipment (UE).
  14. A home-network repository function (h-NRF) in a communication system, the h-NRF comprising: a transceiver; and a controller coupled with the transceiver and configured to: receive, from a visited- network repository function (v-NRF), a first network function (NF) discovery request message including an identifier (ID) of a target public land mobile network (PLMN) for traffic routing, identify an SMF for traffic routing in the target PLMN based on the ID of the target PLMN, and transmit, to the v-NRF, a first NF discovery request response message including information on the SMF for traffic routing in the target PLMN.
  15. The h-NRF of claim 14, wherein, to identify the SMF for traffic routing in the target PLMN, the controller is configured to: transmit, to an NRF in the target PLMN, a second NF discovery request based on a configuration in the h-NRF; and receive, from the NRF in the target PLMN, a second NF discovery request response message including information on the SMF for traffic routing in the target PLMN.

Description

METHOD AND APPARATUS FOR SUPPORTING ROAMING SERVICE TRAFFIC ROUTING IN MOBILE COMMUNICATION SYSTEM The disclosure relates to a mobile communication system. More particularly, the disclosure relates to a method and an apparatus for supporting roaming service traffic routing in a mobile communication system. 5G mobile communication technologies define broad frequency bands such that high transmission rates and new services are possible, and can be implemented not only in "Sub 6GHz" bands such as 3.5GHz, but also in "Above 6GHz" bands referred to as mmWave including 28GHz and 39GHz. In addition, it has been considered to implement 6G mobile communication technologies (referred to as Beyond 5G systems) in terahertz bands (for example, 95GHz to 3THz bands) in order to accomplish transmission rates fifty times faster than 5G mobile communication technologies and ultra-low latencies one-tenth of 5G mobile communication technologies. At the beginning of the development of 5G mobile communication technologies, in order to support services and to satisfy performance requirements in connection with enhanced Mobile BroadBand (eMBB), Ultra Reliable Low Latency Communications (URLLC), and massive Machine-Type Communications (mMTC), there has been ongoing standardization regarding beamforming and massive MIMO for mitigating radio-wave path loss and increasing radio-wave transmission distances in mmWave, supporting numerologies (for example, operating multiple subcarrier spacings) for efficiently utilizing mmWave resources and dynamic operation of slot formats, initial access technologies for supporting multi-beam transmission and broadbands, definition and operation of BWP (BandWidth Part), new channel coding methods such as a LDPC (Low Density Parity Check) code for large amount of data transmission and a polar code for highly reliable transmission of control information, L2 pre-processing, and network slicing for providing a dedicated network specialized to a specific service. Currently, there are ongoing discussions regarding improvement and performance enhancement of initial 5G mobile communication technologies in view of services to be supported by 5G mobile communication technologies, and there has been physical layer standardization regarding technologies such as V2X (Vehicle-to-everything) for aiding driving determination by autonomous vehicles based on information regarding positions and states of vehicles transmitted by the vehicles and for enhancing user convenience, NR-U (New Radio Unlicensed) aimed at system operations conforming to various regulation-related requirements in unlicensed bands, NR UE Power Saving, Non-Terrestrial Network (NTN) which is UE-satellite direct communication for providing coverage in an area in which communication with terrestrial networks is unavailable, and positioning. Moreover, there has been ongoing standardization in air interface architecture/protocol regarding technologies such as Industrial Internet of Things (IIoT) for supporting new services through interworking and convergence with other industries, IAB (Integrated Access and Backhaul) for providing a node for network service area expansion by supporting a wireless backhaul link and an access link in an integrated manner, mobility enhancement including conditional handover and DAPS (Dual Active Protocol Stack) handover, and two-step random access for simplifying random access procedures (2-step RACH for NR). There also has been ongoing standardization in system architecture/service regarding a 5G baseline architecture (for example, service based architecture or service based interface) for combining Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies, and Mobile Edge Computing (MEC) for receiving services based on UE positions. As 5G mobile communication systems are commercialized, connected devices that have been exponentially increasing will be connected to communication networks, and it is accordingly expected that enhanced functions and performances of 5G mobile communication systems and integrated operations of connected devices will be necessary. To this end, new research is scheduled in connection with eXtended Reality (XR) for efficiently supporting AR (Augmented Reality), VR (Virtual Reality), MR (Mixed Reality) and the like, 5G performance improvement and complexity reduction by utilizing Artificial Intelligence (AI) and Machine Learning (ML), AI service support, metaverse service support, and drone communication. Furthermore, such development of 5G mobile communication systems will serve as a basis for developing not only new waveforms for providing coverage in terahertz bands of 6G mobile communication technologies, multi-antenna transmission technologies such as Full Dimensional MIMO (FD-MIMO), array antennas and large-scale antennas, metamaterial-based lenses and antennas for improving coverage of terahertz band signals, high-dimensional space multiplexing technology