Dual SIM User Equipment Frequency Scan Coordination
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Solution Overview
Problem
User equipment (UE) with Dual Receive (DR) or Dual Sim Dual Access (DSDA) capabilities faces challenges in quickly recovering from out-of-service events due to the independent operation of multiple subscriber identity modules (SIMs), leading to increased recovery time and potential power consumption during redundant frequency scanning.
Innovation Solution
The UE generates non-overlapping sets of frequencies for each SIM to scan for cell signals, allowing one transceiver to scan on behalf of another, thereby reducing recovery time and power consumption by eliminating redundant scanning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each SIM performs independent frequency scanning to recover from out-of-service events, then service recovery is achieved for each SIM, but recovery time increases and power consumption increases due to redundant scanning
Solution Approach 1:
The patent merges the frequency scanning operations of multiple SIMs by having one transceiver scan frequencies on behalf of another SIM. This combines redundant scanning operations into a single coordinated action, reducing total recovery time while maintaining service recovery for all SIMs
Solution Approach 2:
A single transceiver is made multi-functional by enabling it to perform frequency scanning for multiple different SIMs. This universal scanning capability allows one transceiver to serve multiple purposes, eliminating the need for each SIM to have dedicated scanning operations
2Reliability
If each SIM performs independent frequency scanning to recover from out-of-service events, then service recovery is achieved for each SIM, but power consumption increases due to redundant scanning
Solution Approach 1:
The patent merges redundant frequency scanning operations into a single coordinated scanning process. By combining the scanning tasks that would otherwise be performed separately by each SIM, the system reduces total power consumption while maintaining service recovery capability for all SIMs
Solution Approach 2:
The system implements self-service by having transceivers perform scanning operations on behalf of other SIMs. This cross-service approach eliminates redundant power-consuming operations while ensuring each SIM still receives the necessary scanning service for recovery
Data Source
AI summary
A method of wireless communication at a user equipment (UE), including: generating a first set of frequencies to search for signals from at least one candidate cell from which the UE may receive wireless service with respect to a first subscriber identity module (SIM); generating a second set of frequencies to search for signals from the at least one candidate cell from which the UE may receive wireless service with respect to the first SIM; scanning for one or more signals from the at least one candidate cell including tuning a first transceiver configured to operate in accordance with the first SIM to one or more of the first set frequencies; and scanning for one or more signals from the at least one candidate cell including tuning a second transceiver configured to operate in accordance with a second SIM to one or more of the second set of frequencies.