Multi-SIM Handover Timer Coordination for Predictable UE State
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Solution Overview
Problem
Current Multi-SIM operation in mobile wireless communication systems lacks standardized support for handover processes, leading to unpredictable UE behavior and performance issues.
Innovation Solution
The method involves receiving RRC reconfigurations from a base station, transmitting UE assistance information, and managing timers to coordinate state transitions during handover, ensuring predictable UE behavior and improved network performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Multi-SIM operation is implemented without standardized support, then device versatility is improved, but UE behavior becomes unpredictable and network functionality cannot be reliably based on consistent behavior
Solution Approach 1:
The patent introduces standardized timer parameters (first timer for terminal state transition, second timer for handover) that change the operational parameters of the UE during Multi-SIM handover. These timers provide controlled, predictable timing behavior for state transitions, transforming the previously unpredictable UE behavior into standardized, reliable operations while maintaining Multi-SIM versatility.
2Reliability
If timer management is added to coordinate state transitions during handover, then handover reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the timer management into distinct functional components: a first timer for terminal state transition and a second timer for handover operations. This segmentation allows each timer to be independently managed and stopped under specific conditions, simplifying the overall complexity while improving handover reliability through structured timing control.
Solution Approach 2:
The patent implements feedback mechanisms where the expiration of one timer triggers the stopping of another timer. The first timer stops when the second timer expires, and vice versa. This feedback-based coordination ensures reliable handover without requiring complex centralized management, reducing overall system complexity while maintaining high reliability.
Data Source
AI summary
A method includes receiving from a base station a first RRCReconfiguration, transmitting to the base station a UEAssistanceInformation, starting the first timer after initiating transmission of UEAssistanceInformation, receiving from the base station a second RRCReconfiguration and starting the second timer before initiating random access procedure. The first RRCReconfiguration includes a configuration information related to terminal state transition, the configuration information related to terminal state transition includes an information for a first timer, the first timer is a timer related to terminal state transition. The UEAssistanceInformation includes an information related to terminal's state. The second RRCReconfiguration includes a ReconfigurationWithSync, the ReconfigurationWithSync includes an information for a second timer related to handover. The first timers stops if the second timer expires while the first timer is running. The second timers stops if the first timer expires while the second timer is running.