Combined IMSI Attach for Multi-USIM Paging Optimization

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Solution Overview

Problem

Mobile terminals with multiple Universal Subscriber Identity Modules (USIMs experience increased power consumption due to the need to monitor multiple paging time intervals, leading to longer idle mode power consumption and additional procedures for each USIM.

Innovation Solution

Implementing a method where a mobile terminal with multiple USIMs performs a combined IMSI attach and location updating using a single network attachment message, allowing monitoring of page messages addressed to multiple IMSIs using a single paging occasion, thereby reducing the number of exchanged messages and power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple USIMs are configured in a mobile terminal, then the terminal can support multiple subscriber identities and networks, but the idle mode power consumption increases due to monitoring multiple paging time intervals

Engineering Contradiction:

Improvemultiple subscriber identity supportVSAvoididle mode power consumption

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The patent combines multiple paging time intervals into a single unified paging occasion. Instead of monitoring separate paging intervals for each USIM, the terminal monitors one consolidated paging occasion that carries paging messages for multiple IMSIs, thereby reducing power consumption while maintaining support for multiple subscriber identities

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The paging message structure is enhanced to serve multiple functions simultaneously. A single paging message can address multiple IMSIs and indicate paging for different USIMs using bitmask fields, allowing the paging system to handle multiple subscriber identities through a universal messaging mechanism

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If separate procedures are executed for each USIM during attachment and location updating, then each subscriber identity is properly registered, but the number of exchanged messages increases

Engineering Contradiction:

Improvesubscriber identity registrationVSAvoidnumber of signaling messages

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges multiple attachment and location updating procedures into a single combined procedure. The terminal sends one location updating request message containing multiple IMSIs and their corresponding location information, and the network responds with a single location updating accept message, thereby reducing signaling overhead while ensuring reliable registration of all subscriber identities

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The location information is segmented and organized by USIM identifier within the combined message. Each USIM's location data is clearly marked and structured, allowing the network to process and track multiple subscriber identities separately within a unified signaling exchange

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS8862145B2Method and apparatus to improvie idle mode power consumption in multiple USIM configuration

Publication Date: 2014.10.14 QUALCOMM INC

AI summary

Certain aspects of the present disclosure propose techniques and apparatus for improving idle mode power consumption of a mobile station with multiple Universal Subscriber Identity Modules (USIMs).