Multi-SIM Cell Handover Using Shared Network Measurements
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Solution Overview
Problem
Current multi-SIM terminal handover processes result in long handover times and delays due to independent network measurements by each SIM, lacking cooperation and unified standards, leading to varied terminal behaviors.
Innovation Solution
A method where a connected SIM in a multi-SIM terminal informs another SIM to perform network measurement and reports the result to the base station, allowing the base station to determine handover based on combined measurement results, thereby optimizing handover timing and reducing service disruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If each SIM performs network measurement independently, then measurement accuracy for each SIM is maintained, but handover time and delay increase
Solution Approach 1:
The patent combines network measurement operations across multiple SIMs by having one SIM perform measurements and share results with other SIMs. This merging approach maintains measurement accuracy while reducing redundant measurements and shortening handover time.
Solution Approach 2:
The patent implements preliminary network measurement by having SIMs perform measurements in advance and cache results. When handover is needed, previously obtained measurement results can be used directly, eliminating the need for immediate new measurements and thus reducing handover delay.
2Reliability
If each SIM performs network measurement independently, then individual SIM measurement reliability is ensured, but overall handover efficiency decreases
Solution Approach 1:
The patent merges measurement operations across SIMs while maintaining result reliability through validation mechanisms. The network measurement results obtained by one SIM are shared with and used by other SIMs, improving handover efficiency while reliability is maintained through cross-verification and error checking.
Solution Approach 2:
The system implements self-service by having SIMs automatically share and utilize each other's measurement results without requiring separate independent measurements. This self-service mechanism improves efficiency while reliability is maintained through automated validation and selection of optimal results.
3Loss of time
If multiple SIMs perform simultaneous network measurement, then handover time is reduced, but system complexity increases
Solution Approach 1:
The patent introduces an intermediary mechanism (measurement result sharing protocol and coordination module) that manages simultaneous measurements across SIMs. This intermediary layer coordinates measurement activities, shares results efficiently, and manages complexity, allowing multiple SIMs to benefit from parallel measurements without overwhelming system complexity.
Data Source
AI summary
A cell handover method. The cell handover method includes: when a first Subscriber Identity Module (SIM) in a multi-SIM terminal is in a connected state, informing, by the first SIM, a second SIM in the multi-SIM terminal of performing network measurement; and when a network measurement result from the second SIM is obtained, reporting, by the first SIM, the network measurement result to a base station to which the first SIM is connected.