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EP-4736573-A1 - METHOD AND APPARATUS FOR RELEASING N1 NON-ACCESS STRATUM (NAS) SIGNALING CONNECTION IN A WIRELESS COMMUNICATION SYSTEM

EP4736573A1EP 4736573 A1EP4736573 A1EP 4736573A1EP-4736573-A1

Abstract

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. Embodiments of the disclosure describe a method for releasing established N1 NAS signalling connection The method includes transmitting a registration request message to a network entity 200 to establish the N1 NAS signalling connection, wherein the registration request message includes an unavailability period duration and does not include a start of unavailability period in the registration request message. The method includes initiating, upon receiving a registration accept message, a predefined timer at a UE 100. The method includes determining whether the initiated predefined timer expiries at the UE 100. The method includes locally releasing the established N1 NAS signalling connection associated with the network entity 200 in response to determining that the initiated predefined timer expires at the UE 100.

Inventors

  • KUMAR, Lalith
  • Agarwal, Aman
  • JAIN, Sidhant
  • WATFA, MAHMOUD

Assignees

  • Samsung Electronics Co., Ltd.

Dates

Publication Date
20260506
Application Date
20240725

Claims (15)

  1. A method performed by a user equipment (UE) in a wireless communication system, the method comprising: transmitting, to an access and mobility management function (AMF) entity, a first message including information on an unavailability period for a non access stratum (NAS) signaling connection; receiving, from the AMF entity, a second message; starting a timer for releasing the NAS signaling connection; and releasing the NAS signaling connection upon an expiry of the timer.
  2. The method of claim 1, wherein the timer is started based on the received second message.
  3. The method of claim 1, wherein the first message does not include information on a start of an unavailability period.
  4. The method of claim 1, wherein the first message is a registration request message, and wherein the second message is a registration accept message.
  5. A method performed by an access and mobility management function (AMF) entity in a wireless communication system, the method comprising: receiving, from a user equipment (UE), a first message including information on an unavailability period for a non access stratum (NAS) signaling connection; transmitting, to the UE, a second message; and releasing the NAS signaling connection after the second message.
  6. The method of claim 5, wherein, in case that the first message includes information on a start of an unavailability period and the unavailability period starts, the method further comprising: detecting a loss of connectivity event; and transmitting, to an application function (AF) entity via a network exposure function (NEF) entity, a third message indicating the loss of connectivity event.
  7. The method of claim 5, wherein, in case that the first message does not include information on a start of an unavailability period, the method further comprising: detecting a loss of connectivity event; and transmitting, to an application function (AF) entity via a network exposure function (NEF) entity, a third message indicating the loss of connectivity event.
  8. The method of claim 5, wherein the first message is a registration request message, and wherein the second message is a registration accept message.
  9. A user equipment (UE) in a wireless communication system, the UE comprising: a transceiver; and a controller coupled with the transceiver and configured to: transmit, to an access and mobility management function (AMF) entity, a first message including information on an unavailability period for a non access stratum (NAS) signaling connection; receive, from the AMF entity, a second message; start a timer for releasing the NAS signaling connection; and release the NAS signaling connection upon an expiry of the timer.
  10. The UE of claim 9, wherein the timer is started based on the received second message.
  11. The UE of claim 9, wherein the first message does not include information on a start of an unavailability period.
  12. The UE of claim 9, wherein the first message is a registration request message, and wherein the second message is a registration accept message.
  13. An access and mobility management function (AMF) entity in a wireless communication system, the AMF entity comprising: a transceiver; and a controller coupled with the transceiver and configured to: receive, from a user equipment (UE), a first message including information on an unavailability period duration for a non access stratum (NAS) signaling connection; transmit, to the UE, a second message; and release the NAS signaling connection after the second message.
  14. The AMF entity of claim 13, wherein, in case that the first message includes information on a start of an unavailability period and the unavailability period starts, the controller further configured to: detect a loss of connectivity event; and transmit, to an application function (AF) entity via a network exposure function (NEF) entity, a third message indicating the loss of connectivity event.
  15. The AMF entity of claim 13, wherein, in case that the first message does not include information on a start of an unavailability period, the controller further is configured to: detect a loss of connectivity event; and transmit, to an application function (AF) entity via a network exposure function (NEF) entity, a third message indicating the loss of connectivity event.

Description

METHOD AND APPARATUS FOR RELEASING N1 NON-ACCESS STRATUM (NAS) SIGNALING CONNECTION IN A WIRELESS COMMUNICATION SYSTEM The present disclosure generally relates to the field of wireless communication networks, and more specifically relates to a method and an apparatus for releasing an N1 Non-access stratum (NAS) signalling connection in the wireless communication network. 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 (THz) 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