Multi-SIM User Equipment Frequency Band Scanning Optimization
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Solution Overview
Problem
User equipment (UE) with multiple subscriber identification modules (SIMs) performs redundant frequency band scans, leading to decreased battery life and degraded user experience due to inefficient scanning procedures.
Innovation Solution
Implementing a method where a UE performs a first scan procedure for a set of radio frequency bands according to a default order, stores an indication of a subset of these bands, and then conducts a second scan procedure using a modified order based on the stored indication, skipping or deprioritizing previously scanned bands to avoid redundancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs separate scan procedures for each subscription, then each subscription can be scanned independently, but redundant frequency band scans occur leading to decreased battery life
Solution Approach 1:
The patent merges the scan procedures for multiple subscriptions by sharing frequency band scan results. When a first subscription completes a scan, the results are stored and used to guide scans for subsequent subscriptions, eliminating redundant scanning of the same frequency bands across different subscriptions.
Solution Approach 2:
The patent performs preliminary scanning for the first subscription and stores the results before proceeding to scan for subsequent subscriptions. This preliminary action provides the basis for optimizing later scan procedures by avoiding re-scanning already examined frequency bands.
2Reliability
If the UE performs separate scan procedures for each subscription, then each subscription can be scanned independently, but signal acquisition time increases due to redundant scanning
Solution Approach 1:
The patent merges the scan procedures for multiple subscriptions by sharing frequency band scan results. When a first subscription completes a scan, the results are stored and used to guide scans for subsequent subscriptions, eliminating redundant scanning of the same frequency bands across different subscriptions.
Solution Approach 2:
The patent performs preliminary scanning for the first subscription and stores the results before proceeding to scan for subsequent subscriptions. This preliminary action provides the basis for optimizing later scan procedures by avoiding re-scanning already examined frequency bands.
3Device complexity
If the UE uses default scanning order for all subscriptions, then the scanning process is simple, but scanning efficiency decreases when multiple subscriptions are present
Solution Approach 1:
The patent introduces dynamic scanning order adjustment based on stored scan results from previous subscriptions. Instead of using a fixed default scanning order, the system adapts the scanning sequence by prioritizing frequency bands that were scanned in previous operations, thereby optimizing efficiency without significantly increasing complexity.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may perform a first scan procedure for a first of radio frequency bands according to a default scanning order at a first subscription of the UE, store an indication of a subset of radio frequency bands of the first set of radio frequency bands for the first scan procedure, and perform a second scan procedure for a second set of radio frequency bands according to a modified scanning order based on the stored indication of the subset of radio frequency bands. In some cases, the UE may determine a relevance of the stored indication of the subset of radio frequency bands of the first set of radio frequency bands and determine the modified scanning order based on the relevance of the stored indication.