Multi-Subscriber Identity Module Terminal Paging Timing Adjustment

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Solution Overview

Problem

In a terminal apparatus with multiple Subscriber Identity Modules (USIMs) and fewer receivers, existing paging techniques are inefficient when paging timings coincide, leading to prolonged detection times for data addressed to the terminal.

Innovation Solution

The terminal apparatus and core network apparatus collaborate to adjust paging timings by exchanging offset values or setting values, allowing the terminal to efficiently observe paging channels from multiple base stations, even with fewer receivers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the terminal apparatus uses existing paging techniques with multiple USIMs and fewer receivers, then the terminal can operate with limited receivers, but the detection time for data addressed to the terminal increases when paging timings coincide

Engineering Contradiction:

Improvenumber of receiversVSAvoiddetection time for data

Core Design Contradiction:

Device complexityVSLoss of time

Solution Approach 1:

The terminal apparatus performs preliminary calculation of paging timings for all USIMs before actual paging occurs. By pre-calculating which USIMs will have coinciding paging timings and which will have non-coinciding timings, the terminal can proactively configure observation strategies that avoid waiting for sequential paging cycles, thereby reducing detection time without requiring additional receivers

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The terminal dynamically adjusts its paging observation strategy based on the calculated timing relationships between different USIMs. When paging timings coincide, the terminal adapts by selecting which USIM to observe first or by adjusting observation timing, transforming the static limitation of having fewer receivers into a manageable dynamic problem that reduces overall detection time

Inventive Principle:

Principle #15Dynamics

2Reliability

If the terminal apparatus reads paging channels sequentially for multiple USIMs, then the terminal can observe all paging channels, but the time to detect data addressed to the terminal increases

Engineering Contradiction:

Improveability to observe all paging channelsVSAvoidtime to detect data

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The terminal pre-calculates paging timings for all USIMs and identifies which USIMs will have non-coinciding paging moments. By using this preliminary information, the terminal can focus observation efforts on USIMs with non-coinciding timings first, or configure the network to prioritize certain USIMs, thereby reducing the time needed to detect data while maintaining the ability to observe all channels

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The terminal provides feedback to the network about its USIM configuration and paging timing calculations. This feedback mechanism allows the network to adjust paging parameters or timing offsets to create non-coinciding paging moments, enabling the terminal to observe multiple channels more efficiently without sequential reading delays

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20220408404A1Terminal apparatus, core network apparatus, control method, and computer-readable storage medium for executing paging control with respect to terminal apparatus including plurality of subscriber identity modules

Publication Date: 2022.12.22 KDDI CORP

AI summary

A terminal apparatus judges whether or not a first timing of paging relating to a first base station apparatus and a second timing of paging relating to a second base station apparatus coincide with each other, transmits, if it is judged that the first and second timings coincide with each other, a predetermined notification regarding a timing of paging to at least one of the first and second base station apparatuses, and changes, on the basis that the predetermined notification has been transmitted, the timing of paging of the base station apparatus to which the predetermined notification has been transmitted.