UE RAT Restriction Control for Low-Signaling Cell Reselection
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Solution Overview
Problem
Current mechanisms for managing radio access technology (RAT) restrictions in wireless networks lead to increased signaling load, prolonged service outages, and repeated attempts by user equipment (UE) to use restricted RATs, resulting in network congestion and degraded service quality during national roaming.
Innovation Solution
A method and system for managing RAT restrictions through dynamic and policy-driven control, where the UE indicates capability restriction information to a network entity (NE), allowing the NE to deliver policy-based access control, reducing unnecessary signaling and power consumption by avoiding access to restricted RATs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current mechanisms for managing RAT restrictions are used, then network operators can control access to restricted RATs, but signaling load increases and service quality degrades
Solution Approach 1:
The UE stores RAT restriction information received from the network and proactively applies it during cell selection and reselection procedures. This preliminary action prevents the UE from attempting to access restricted RATs in the first place, eliminating the need for subsequent signaling exchanges to reject such access attempts, thereby reducing signaling load while maintaining service quality.
Solution Approach 2:
The UE autonomously manages RAT access by internally storing and applying restriction policies without requiring continuous network intervention. The UE self-determines which RATs to access based on stored restriction information, eliminating the need for repeated network-UE signaling loops and reducing overall signaling burden while maintaining reliable service delivery.
2Reliability
If UE repeatedly attempts to use restricted RATs, then access control is enforced, but service outages are prolonged
Solution Approach 1:
The UE stores RAT restriction information and proactively avoids attempting to access restricted RATs during cell selection and reselection. This preliminary avoidance action eliminates repeated access attempts that would otherwise occur, thereby reducing service outage duration while maintaining effective access control through the stored restriction policies.
3Productivity
If dynamic policy-based RAT control is implemented, then network efficiency improves, but device complexity increases
Solution Approach 1:
The patent extracts the complex policy decision-making logic from the UE and places it in the network. The UE only stores simple restriction information and applies basic access control, while the network handles complex policy evaluations, dynamic adjustments, and coordination. This extraction reduces UE complexity while maintaining high network efficiency through centralized policy management.
Data Source
AI summary
The present disclosure relates to a 5G or 6G communication system for supporting higher data transmission rates and satisfying various service requirements. A method performed by a terminal in a communication system is provided. The method includes transmitting, to a network function managing mobility, a first NAS message including capability information, wherein the capability information indicates whether the terminal supports an access technology utilization control; receiving, from the network function, a second NAS message including information on the access technology utilization control, wherein the information on the access technology utilization control indicates restricted access technology associated with a current PLMN; storing the information on the access technology utilization control; and applying the information on the access technology utilization control for a cell selection and a cell reselection in the current PLMN for restricting an access to the restricted access technology.