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US-20260128942-A1 - METHOD FOR OPERATING CORE NETWORK FOR OVERCOMING CORE NETWORK FAILURE PROBLEM IN 5G WIRELESS COMMUNICATION SYSTEM

US20260128942A1US 20260128942 A1US20260128942 A1US 20260128942A1US-20260128942-A1

Abstract

In one embodiment, a method for operating a first network function (NF) related to a failure of a second network function (NF) in a wireless communication system comprises: the first NF recognizing the failure of the second NF; and on the basis of the first NF recognizing the failure of the second NF, transmitting information indicating a status of the second NF to an access and mobility management function (AMF), wherein the information indicating the status of the second NF triggers a user equipment (UE) context release command transmitted by the AMF to a base station.

Inventors

  • Seungjong YUK
  • Hoyeon RYU

Assignees

  • LG ELECTRONICS INC.

Dates

Publication Date
20260507
Application Date
20231005
Priority Date
20221005

Claims (16)

  1. 1 . A method of operating a first Network Function (NF) related to a failover of a second NF in a wireless communication system, the method comprising: recognizing the failover of the second NF by the first NF; and based on the first NF recognizing the failover of the second NF, transmitting information indicating a status of the second NF to an Access and Mobility Management Function (AMF), wherein the information indicating the status of the second NF triggers a User Equipment (UE) context release command transmitted by the AMF to a base station.
  2. 2 . The method of claim 1 , wherein the first NF recognizes the failover of the second NF based on an ID change of the second NF.
  3. 3 . The method of claim 2 , wherein the ID change of the second NF is caused by a restart based on the failover of the second NF.
  4. 4 . The method of claim 1 , wherein the first NF recognizes the failover of the second NF based on a heartbeat failover of the second NF.
  5. 5 . The method of claim 4 , wherein the heartbeat failure is that a heartbeat from the second NF is not received within a preset time.
  6. 6 . The method of claim 1 , wherein the information indicating the status of the second NF is an NF status notify message.
  7. 7 . The method of claim 6 , wherein the UE context release command is a UE context releases command message.
  8. 8 . The method of claim 1 , wherein the UE context release command triggers an RRC release message of the base station to the UE.
  9. 9 . The method of claim 8 , wherein the UE disconnected from a core network 1 having the AMF belong thereto by the RRC release message transmits a service request for a connection request to the AMF belonging to the core network 1 .
  10. 10 . The method of claim 8 , wherein the UE disconnected from a core network 1 having the AMF belong thereto by the RRC release message transmits a service request for a connection request to an AMF belonging to a core network 2 .
  11. 11 . The method of claim 10 , wherein the core network 1 and the core network 2 are related to a redundancy network configuration.
  12. 12 . The method of claim 1 , wherein the first NF is a Network Repository Function (NRF) and wherein the second NF is a UPF or an SMF.
  13. 13 . The method of claim 1 , wherein the first NF is a User Plane Function (UPF) and wherein the second NF is a Session Management Function (SMF).
  14. 14 . The method of claim 1 , wherein the first NF is an SMF and wherein the second NF is a UPF.
  15. 15 . A first Network Function (NF) in a wireless communication system, the first NF comprising: at least one processor; and at least one computer memory operatively connected to the at least one processor and storing instructions enabling the at least one processor to perform operations when executed; the operations comprising: recognizing the failover of the second NF by the first NF; and based on the first NF recognizing the failover of the second NF, transmitting information indicating a status of the second NF to an Access and Mobility Management Function (AMF), wherein the information indicating the status of the second NF triggers a User Equipment (UE) context release command transmitted by the AMF to a base station.
  16. 16 . A non-volatile computer-readable storage medium storing at least one computer program including an instruction enabling at least one processor to perform operations for a first NF when executed, the operations comprising: recognizing the failover of the second NF by the first NF; and based on the first NF recognizing the failover of the second NF, transmitting information indicating a status of the second NF to an Access and Mobility Management Function (AMF), wherein the information indicating the status of the second NF triggers a User Equipment (UE) context release command transmitted by the AMF to a base station.

Description

TECHNICAL FIELD The following description relates to a wireless communication system, and more specifically, to a CORE N/W method and apparatus for overcoming a failover problem in a 5G SA redundancy/single CORE communication network. BACKGROUND ART A wireless communication system uses various radio access technologies (RATs) such as long term evolution (LTE), LTE-advanced (LTE-A), and wireless fidelity (WiFi). 5th generation (5G) is such a wireless communication system. Three key requirement areas of 5G include (1) enhanced mobile broadband (eMBB), (2) massive machine type communication (mMTC), and (3) ultra-reliable and low latency communications (URLLC). Some use cases may require multiple dimensions for optimization, while others may focus only on one key performance indicator (KPI). 5G supports such diverse use cases in a flexible and reliable way. eMBB goes far beyond basic mobile Internet access and covers rich interactive work, media and entertainment applications in the cloud or augmented reality (AR). Data is one of the key drivers for 5G and in the 5G era, we may for the first time see no dedicated voice service. In 5G, voice is expected to be handled as an application program, simply using data connectivity provided by a communication system. The main drivers for an increased traffic volume are the increase in the size of content and the number of applications requiring high data rates. Streaming services (audio and video), interactive video, and mobile Internet connectivity will continue to be used more broadly as more devices connect to the Internet. Many of these applications require always-on connectivity to push real time information and notifications to users. Cloud storage and applications are rapidly increasing for mobile communication platforms. This is applicable for both work and entertainment. Cloud storage is one particular use case driving the growth of uplink data rates. 5G will also be used for remote work in the cloud which, when done with tactile interfaces, requires much lower end-to-end latencies in order to maintain a good user experience. Entertainment, for example, cloud gaming and video streaming, is another key driver for the increasing need for mobile broadband capacity. Entertainment will be very essential on smart phones and tablets everywhere, including high mobility environments such as trains, cars and airplanes. Another use case is augmented reality (AR) for entertainment and information search, which requires very low latencies and significant instant data volumes. One of the most expected 5G use cases is the functionality of actively connecting embedded sensors in every field, that is, mMTC. It is expected that there will be 20.4 billion potential Internet of things (IoT) devices by 2020. In industrial IoT, 5G is one of areas that play key roles in enabling smart city, asset tracking, smart utility, agriculture, and security infrastructure. URLLC includes services which will transform industries with ultra-reliable/available, low latency links such as remote control of critical infrastructure and self-driving vehicles. The level of reliability and latency are vital to smart-grid control, industrial automation, robotics, drone control and coordination, and so on. Now, multiple use cases will be described in detail. 5G may complement fiber-to-the home (FTTH) and cable-based broadband (or data-over-cable service interface specifications (DOCSIS)) as a means of providing streams at data rates of hundreds of megabits per second to giga bits per second. Such a high speed is required for TV broadcasts at or above a resolution of 4K (6K, 8K, and higher) as well as virtual reality (VR) and AR. VR and AR applications mostly include immersive sport games. A special network configuration may be required for a specific application program. For VR games, for example, game companies may have to integrate a core server with an edge network server of a network operator in order to minimize latency. The automotive sector is expected to be a very important new driver for 5G, with many use cases for mobile communications for vehicles. For example, entertainment for passengers requires simultaneous high capacity and high mobility mobile broadband, because future users will expect to continue their good quality connection independent of their location and speed. Other use cases for the automotive sector are AR dashboards. These display overlay information on top of what a driver is seeing through the front window, identifying objects in the dark and telling the driver about the distances and movements of the objects. In the future, wireless modules will enable communication between vehicles themselves, information exchange between vehicles and supporting infrastructure and between vehicles and other connected devices (e.g., those carried by pedestrians). Safety systems may guide drivers on alternative courses of action to allow them to drive more safely and lower the risks of acciden