MUSIM Paging Restriction for Dual-SIM Performance

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Solution Overview

Problem

In LTE and 5G wireless communication systems, the unclear meaning of paging restriction configurations for user equipment (UE) with multiple USIMs leads to inconsistent network behavior and unsynchronized registration states, affecting performance and user experience.

Innovation Solution

A method where the UE sends a request message to the network with preferred paging restriction information, and the network responds with an acceptance message, allowing the network to determine whether to page the UE based on the indicated restrictions, thereby selectively restricting downlink signaling on one USIM to prioritize more important jobs on another USIM.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the network pages the UE for all downlink signaling messages, then the UE can receive all downlink messages, but the UE cannot perform important jobs on another USIM with better performance

Engineering Contradiction:

Improveperformance of important jobs on USIM2VSAvoidsynchronization of Registration state and PDU state

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent segments the paging behavior by USIM card, allowing different paging restriction configurations for USIM1 and USIM2. The UE can apply paging restriction on USIM1 while maintaining normal paging on USIM2, enabling selective control of downlink signaling reception per USIM to improve productivity on the active USIM without compromising reliability through state synchronization.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies different paging restriction qualities to different USIMs based on local conditions. The UE can configure paging restriction information specifically for USIM1 when important jobs are detected on USIM2, creating localized optimization without affecting the overall system reliability through proper state management.

Inventive Principle:

Principle #3Local quality

2Productivity

If the network restricts paging for all downlink signaling messages, then the UE can perform important jobs on another USIM with better performance, but the Registration state and PDU state may not be synchronized

Engineering Contradiction:

Improveperformance of important jobs on USIM2VSAvoidsynchronization between Registration state and PDU state

Core Design Contradiction:

ProductivityVSLoss of information

Solution Approach 1:

The patent implements preliminary action by having the UE indicate its paging restriction preference to the network before downlink signaling needs to be delivered. The UE sends paging restriction information in the Service Request or Registration Request message, allowing the network to proactively avoid paging the UE on USIM1 when important jobs are detected on USIM2, thus preventing state desynchronization before it occurs.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent establishes a feedback mechanism where the UE monitors its own state and provides feedback to the network about its paging restriction preferences. When the UE detects important jobs on USIM2, it sends updated paging restriction information to the network, which then adjusts its paging behavior accordingly to maintain state synchronization while optimizing productivity.

Inventive Principle:

Principle #23Feedback

3Ease of operation

If the UE sends paging restriction information to the network, then the network can determine whether to page the UE, but the network behavior becomes inconsistent among different vendors

Engineering Contradiction:

Improvecontrol over paging behaviorVSAvoidconsistency of network implementation

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent achieves universality by defining a standardized mechanism that works across different network vendors. The UE sends paging restriction information using standard 3GPP procedures (Service Request, Registration Request messages), and the network responds with standardized accept/reject messages. This universal approach ensures consistent behavior across different vendor implementations while maintaining ease of operation for the UE.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20230104092A1Musim paging restriction in eps

Publication Date: 2023.04.06 MEDIATEK INC

AI summary

A method of determining paging restriction on downlink signals for MUSIM UEs is proposed. If a UE requests the network to support paging restriction over the first USIM, the UE can send a request message to the network, carrying a UE-preferred paging restriction information. Subsequently, the UE should then receive an accept message from the network that the paging is restricted over the first USIM based on the UE-preferred paging restriction information. As a result, when DL signaling is pending for the UE over the first USIM, the network can determine whether it should page the UE over the first USIM based on the paging restriction type indicated in the paging restriction information. Since the DL signaling is selectively restricted over USIM1, the UE can perform more important jobs over USIM2 with better performance and user experience.