UE Dual Registration Handling for Tracking Area Rejects
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Solution Overview
Problem
Current wireless communication systems face challenges in maintaining service continuity for User Equipment (UE) during mobility between tracking areas, particularly when operating in dual registration mode, leading to data loss due to network rejections and deactivation of context information in alternate radio access technologies.
Innovation Solution
The UE is equipped with a service continuity controller and registration engine that detect location changes and trigger appropriate registration procedures, allowing it to maintain dual registration even when the network indicates single registration, thereby preventing context information loss by including alternate radio access technology status in registration requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE triggers a tracking area update procedure when moving to a new tracking area, then the service continuity is maintained, but the network may reject the update and deactivate the context information in alternate RAT
Solution Approach 1:
The patent applies preliminary action by having the UE include alternate RAT registration status information in the tracking area update request message before the network makes a rejection decision. This advance inclusion of dual registration status allows the network to process and preserve context information across RATs, preventing deactivation while maintaining service continuity during mobility.
2Adaptability or versatility
If the UE operates in dual registration mode to maintain service continuity, then the service availability is improved, but the network complexity increases due to additional registration management
Solution Approach 1:
The patent applies universality by enabling the UE to maintain dual registration status across different RATs (e.g., LTE and 5G NR) through a unified registration management approach. The UE includes its alternate RAT registration status in the tracking area update request, allowing the network to universally manage multi-RAT contexts without requiring separate complex management procedures for each RAT combination.
Data Source
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Figure 2
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AI summary
Embodiments herein provide a method for maintaining service continuity by a User Equipment (UE) in a wireless communication system. The method includes detecting, by the UE, a change in location during a mobility of the UE from one tracking are to another tracking are within a radio access technology which is referred here as a first radio access technology. Further, on receiving the Registration or Tracking area reject from the core network of first radio access technology, the method includes initiating, by the UE, Initial Registration Request or Initial Attach Request procedure, wherein the UE sends an Registration Request or Attach Request message with other registered radio access technology information referred here as second radio access technology to a core network associated with the first radio access technology.