Multi-SIM RAT Alignment to Cut UE Wakeups and Redundant Measurements
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multi-subscriber identity module (SIM) user equipment (UEs) face inefficiencies in power consumption and throughput when subscriptions are on different radio access technologies (RATs, as they perform individual neighbor cell searches and measurements, leading to additional sleep/wakeup overhead and power drain.
Innovation Solution
A forced radio access technology (RAT) transitioning method is implemented, where a default data subscription (DDS) camps on a suitable cell and performs activities on behalf of a non-default subscription (non-DDS), merging idle mode activities and reducing unnecessary wakeups and tune-aways.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual neighbor cell searches and measurements are performed for each subscription on different RATs, then each subscription can maintain its own optimal connection, but power consumption increases due to additional sleep/wakeup overhead
Solution Approach 1:
The patent merges idle mode activities of multiple subscriptions by forcing the non-DDS subscription to transition to the same RAT as the DDS subscription. This allows the UE to perform neighbor cell searches and measurements once for both subscriptions, eliminating redundant operations and reducing power consumption while maintaining connection quality for both subscriptions
2Reliability
If individual neighbor cell searches and measurements are performed for each subscription on different RATs, then each subscription can maintain its own optimal connection, but throughput decreases due to redundant measurements
Solution Approach 1:
The patent combines the idle mode activities of DDS and non-DDS subscriptions by forcing them to operate on the same RAT. This merging eliminates redundant neighbor cell searches and measurements, reducing the time and resources spent on duplicate operations, thereby improving overall system throughput while maintaining connection quality
3Use of energy by moving object
If subscriptions are forced to use the same RAT, then power consumption and throughput are improved by eliminating redundant measurements, but adaptability to optimal RAT for each subscription is reduced
Solution Approach 1:
The patent applies preliminary action by forcing the non-DDS subscription to transition to the DDS subscription's RAT before idle mode activities begin. This pre-established RAT alignment ensures that subsequent neighbor cell searches and measurements can be shared between subscriptions, reducing power consumption while maintaining the ability to adapt to optimal RAT conditions through the DDS subscription's normal operation
Data Source
AI summary
A method of wireless communication by a user equipment (UE) supporting multiple subscriptions, includes camping on a first cell of a first radio access technology (RAT) with a first data subscription, and camping on a second cell of a second RAT with a second data subscription. The method also includes triggering a transition to the first cell of the first RAT for the second data subscription. The method further includes performing, with the first data subscription, activities on behalf of the second data subscription.