EP-4736541-A1 - METHOD OF PROVIDING NETWORK SLICES IN WIRELESS COMMUNICATION SYSTEM

EP4736541A1EP 4736541 A1EP4736541 A1EP 4736541A1EP-4736541-A1

Abstract

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by an AMF in a wireless communication system is provided. The method includes receiving, from a UE, requested NSSAI including a plurality of S-NSSAI, identifying whether each of the plurality of S-NSSAI is available, identifying a number of S-NSSAIs included in an allowed NSSAI; in case that the number of S-NSSAIs in the allowed NSSAI is less than a maximum number of S-NSSAIs for the allowed NSSAI, determining to include alternative S-NSSAI for a first S-NSSAI that is not available, and in case that the number of S-NSSAIs in the allowed NSSAI is at least equal to the maximum number of S-NSSAIs for the allowed NSSAI, determining S-NSSAIs for the allowed NSSAI based on whether the each of the plurality of S-NSSAI is associated with a PDU session.

Inventors

LEE, HOYEON
SUH, DONGEUN

Assignees

Samsung Electronics Co., Ltd.

Dates

Publication Date: 20260506
Application Date: 20240801

Claims (15)

A method performed by an access and mobility management function (AMF) in a wireless communication system, the method comprising: receiving, from a user equipment (UE), requested network slice selection assistance information (NSSAI) including a plurality of single-NSSAI (S-NSSAI); identifying whether each of the plurality of S-NSSAI is available; identifying a number of S-NSSAIs included in an allowed NSSAI; in case that the number of S-NSSAIs in the allowed NSSAI is less than a maximum number of S-NSSAIs for the allowed NSSAI, determining to include alternative S-NSSAI for a first S-NSSAI that is not available; and in case that the number of S-NSSAIs in the allowed NSSAI is at least equal to the maximum number of S-NSSAIs for the allowed NSSAI, determining S-NSSAIs for the allowed NSSAI based on whether each of the plurality of S-NSSAI is associated with a protocol data unit (PDU) session.
The method of claim 1, wherein determining the S-NSSAIs for the allowed NSSAI based on whether each of the plurality of S-NSSAI is associated with the PDU session comprises removing a second S-NSSAI that is available and not associated with the PDU session from the allowed NSSAI.
The method of claim 1, wherein the first S-NSSAI is associated with a PDU session.
The method of claim 1, further comprising transmitting, to the UE, a UE configuration update message including information on mapping between the first S-NSSAI and the alternative S-NSSAI.
The method of claim 1, wherein the maximum number of S-NSSAIs for the allowed NSSAI is configured to 8.
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), a requested network slice selection assistance information (NSSAI) including a first single-NSSAI (S-NSSAI) to be included in an allowed NSSAI and a second S-NSSAI. receiving, from the AMF, the allowed NSSAI; identifying whether the allowed NSSAI includes an alternative S-NSSAI for the first S-NSSAI; and in case that the alternative S-NSSAI is included in the allowed NSSAI, modifying network slice information for a protocol data unit (PDU) session associated with the first S-NSSAI to the alternative NSSAI.
The method of claim 6, further comprising, in case that the alternative S-NSSAI is not included in the allowed NSSAI, releasing the PDU session associated with the first S-NSSAI.
The method of claim 6, wherein identifying whether the allowed NSSAI includes the alternative S-NSSAI for the first S-NSSAI is performed based on a UE configuration update message, and wherein the UE configuration update message includes information on mapping between the first S-NSSAI and the alternative S-NSSAI.
An access and mobility management function (AMF) in a wireless communication system, the AMF comprising: a transceiver; and a controller coupled with the transceiver and configured to: receive, from a user equipment (UE), requested network slice selection assistance information (NSSAI) including a plurality of single-NSSAI (S-NSSAI), identify whether each of the plurality of S-NSSAI is available, identify a number of S-NSSAIs included in an allowed NSSAI, in case that the number of S-NSSAIs in the allowed NSSAI is less than a maximum number of S-NSSAIs for the allowed NSSAI, determine to include alternative S-NSSAI for a first S-NSSAI that is not available, and in case that the number of S-NSSAIs in the allowed NSSAI is at least equal to the maximum number of S-NSSAIs for the allowed NSSAI, determine S-NSSAIs for the allowed NSSAI based on whether each of the plurality of S-NSSAI is associated with a protocol data unit (PDU) session.
The AMF of claim 9, wherein the controller is further configured to remove a second S-NSSAI that is available and not associated with the PDU session from the allowed NSSAI.
The AMF of claim 9, wherein the first S-NSSAI is associated with a PDU session.
The AMF of claim 9, wherein the controller is further configured to transmit, to the UE, a UE configuration update message including information on mapping between the first S-NSSAI and the alternative S-NSSAI.
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), a requested network slice selection assistance information (NSSAI) including a first single-NSSAI (S-NSSAI) to be included in an allowed NSSAI and a second S-NSSAI, receive, from the AMF, the allowed NSSAI, identify whether the allowed NSSAI includes an alternative S-NSSAI for the first S-NSSAI, and in case that the alternative S-NSSAI is included in the allowed NSSAI, modify network slice information for a protocol data unit (PDU) session associated with the first S-NSSAI to the alternative NSSAI.
The UE of claim 13, wherein the controller is further configured to, in case that the alternative S-NSSAI is not included in the allowed NSSAI, release the PDU session associated with the first S-NSSAI.
The UE of claim 13, wherein the identification of whether the allowed NSSAI includes the alternative S-NSSAI for the first S-NSSAI is performed based on a UE configuration update message, and wherein the UE configuration update message includes information on mapping between the first S-NSSAI and the alternative S-NSSAI.

Description

METHOD OF PROVIDING NETWORK SLICES IN WIRELESS COMMUNICATION SYSTEM The disclosure relates generally to an apparatus and a method for providing network slices in a wireless 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 using OAM (Orbital Angular Momentum), and RIS (Reconfigurable Intelligent Surface), but also full-duplex technol