5G Network Slice Reselection via Tracking-Area Registration Updates
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Solution Overview
Problem
A terminal in a 3GPP 5G system incorrectly recognizes an available network slice as unusable due to incorrect mapping information during tracking area switching, leading to inefficient network slice utilization and potential service disruptions.
Innovation Solution
The method involves transmitting a registration request message with single-network slice selection assistance information (S-NSSAI) to the AMF, receiving allowed and rejected S-NSSAI information, and updating the registration request with supported S-NSSAI upon location change to ensure accurate network slice availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal uses mapping information between network slice and tracking area to determine slice availability, then the terminal can quickly identify available slices, but the terminal may incorrectly recognize available slices as unusable due to incorrect mapping information
Solution Approach 1:
The terminal monitors whether data transmission on a network slice fails repeatedly, and when a failure threshold is reached, it switches to requesting slice information directly from the base station rather than relying on pre-stored mapping information. This feedback mechanism corrects incorrect slice availability determinations by validating against actual network conditions.
Solution Approach 2:
The terminal autonomously detects transmission failures on specific network slices and self-corrects its slice selection strategy by switching to direct base station queries. This self-service approach allows the terminal to adapt to incorrect mapping information without external intervention, maintaining reliable service continuity.
2Reliability
If the terminal switches to direct base station queries for slice information, then the terminal can obtain accurate slice availability, but the signaling overhead and communication frequency increase
Solution Approach 1:
The terminal does not switch to direct base station queries for all slice information requests, but only when transmission failures indicate mapping information is incorrect. This partial action approach maintains energy efficiency by using the lower-overhead mapping information method whenever possible, while resorting to direct queries only when necessary.
Solution Approach 2:
The terminal changes its operational parameter from relying on pre-stored mapping information to requesting real-time slice information from the base station based on transmission success/failure conditions. This parameter change allows the system to adapt between two different information acquisition strategies, balancing accuracy and energy consumption dynamically.
Data Source
AI summary
The present disclosure relates to a 5G or 6G communication system for supporting higher data transmission rates. An embodiment of the present disclosure proposes a method performed by a terminal in a wireless communication system. A method of a terminal according to an embodiment of the present disclosure may comprise the steps of: transmitting a first registration request message including at least one piece of single-network slice selection assistance information (S-NSSAI) to an access and mobility management function (AMF); receiving, from the AMF, a registration acceptance message including information of rejected S-NSSAI for a tracking area (TA) and information of allowed S-NSSAI; and when a location of the terminal moves from a first TA within a registration area (RA) to a second TA within the RA, transmitting a second registration request message including at least some S-NSSAI of the rejected S-NSSAI to the AMF.