Multi-SIM Call Setup Fallback Procedure Optimization

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Solution Overview

Problem

In wireless communication devices with multiple SIMs enabling multiple Radio Access Technologies (RATs), the Extended Service Request (ESR) process for one RAT can delay call setup for another RAT, leading to potential call failures due to prolonged delays and power consumption issues, especially in Single Radio Long Term Evolution (SRLTE) mode.

Innovation Solution

The method involves detecting calls for the second RAT and performing a fallback procedure for the first RAT only when network conditions are above a threshold, allowing for timely transmission of page responses after completing the fallback procedure, and bypassing the fallback procedure when conditions are below the threshold to reduce call setup time and power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the Extended Service Request (ESR) fallback procedure is performed for the first RAT, then the first RAT call reliability is improved, but the call setup time for the second RAT increases causing call failures

Engineering Contradiction:

Improvefirst RAT call reliabilityVSAvoidcall setup time for second RAT

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent implements dynamic adjustment of the ESR fallback procedure based on network conditions. When network conditions are favorable, the ESR procedure is performed to ensure reliable first RAT calls. When network conditions are poor or time is critical, the ESR procedure is skipped or shortened to prevent second RAT call failures. This dynamic approach resolves the contradiction by adapting the fallback procedure duration and execution to current system state.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes key parameters of the ESR fallback procedure including timeout values, retry counts, and procedure activation thresholds based on network conditions and call priority. By adjusting these parameters dynamically, the system can balance between ensuring first RAT call reliability and maintaining acceptable call setup times for the second RAT, resolving the time-reliability contradiction.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the Extended Service Request (ESR) fallback procedure is performed for the first RAT, then the first RAT call reliability is improved, but the power consumption increases

Engineering Contradiction:

Improvefirst RAT call reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent dynamically controls the execution of the ESR fallback procedure based on real-time network conditions and device state. When network conditions indicate poor quality or when power saving is prioritized, the ESR procedure is skipped or terminated early, reducing power consumption. When network conditions are good and reliability is prioritized, the full ESR procedure is executed. This dynamic control resolves the contradiction between reliability and power consumption.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent adjusts ESR procedure parameters such as maximum duration, retry attempts, and activation thresholds based on power management policies and network conditions. By changing these parameters, the system can reduce power consumption during ESR execution while maintaining adequate call reliability, resolving the energy-reliability contradiction.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the page response transmission is delayed to wait for APM validation, then the call setup completeness is improved, but the call setup time increases causing dropped calls

Engineering Contradiction:

Improvecall setup completenessVSAvoidcall setup time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent performs preliminary actions by starting page response transmission before APM validation is complete. The system prepares and sends page responses with current APM information in advance, rather than waiting for validation to finish. This preliminary action reduces call setup time while maintaining call completeness through subsequent updates.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent maintains continuous useful action by updating APM information in the page response during transmission rather than pausing to wait for validation. The system continuously refines APM data and incorporates updates into ongoing page responses, ensuring both timeliness and completeness without interrupting the call setup process.

Inventive Principle:

Principle #20Continuity of useful action

Data Source

PatentUS9913245B2Multi-subscriber identity module (SIM) call setup

Publication Date: 2018.03.06 QUALCOMM INC

AI summary

Apparatuses and methods for a wireless communication device having a first radio access technology (RAT) and a second RAT to set up a call for the second RAT is described herein, including, but not limited to, detecting a call for the second RAT. In response to detecting the call for the second RAT, a fallback procedure is performed for the first RAT when network conditions associated with the first RAT are not below a threshold. At least one page response is transmitted after the fallback procedure has been completed.