Multi-SIM Device Paging Coordination via Assistance Indications

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Solution Overview

Problem

Current wireless communications networks face challenges in supporting communications devices with multiple SIM applications, as they often cannot receive simultaneous paging messages from different networks due to overlapping paging frames and lack of specific support for multiple active SIM subscriptions, leading to interference and power consumption issues.

Innovation Solution

A method is introduced where a communications device registered in two cellular wireless communications networks determines time periods for downlink transmissions in one network and transmits an assistance information indication to the other network to select a monitoring time that avoids conflicts with transmissions in the first network, ensuring the device can receive downlink transmissions from both networks without interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a communications device monitors both networks simultaneously, then the device can receive downlink transmissions from both networks, but the device cannot receive simultaneous paging messages from different networks due to overlapping paging frames

Engineering Contradiction:

Improvereception of downlink transmissionsVSAvoidinterference between networks

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent segments the monitoring of downlink transmissions by dividing the time domain into different monitoring occasions for different networks. The device monitors the first network during first monitoring occasions and the second network during second monitoring occasions, preventing simultaneous reception conflicts while maintaining reliable reception from both networks.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements dynamic adjustment of monitoring times based on network conditions and device state. The monitoring occasions are determined dynamically considering the device's registration status in multiple networks and the timing of downlink transmissions, allowing flexible adaptation to avoid interference.

Inventive Principle:

Principle #15Dynamics

2Object-affected harmful factors

If the device uses time divided schedule for monitoring, then the device can avoid interference between networks, but the device may miss downlink transmissions if monitoring times are not optimized

Engineering Contradiction:

Improveinterference between networksVSAvoidreception of downlink transmissions

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent incorporates feedback mechanisms where the device provides assistance information indications to the network about its monitoring capabilities and timing preferences. The network uses this feedback to optimize the scheduling of downlink transmissions, ensuring reliable delivery while avoiding interference with other network monitoring activities.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent changes timing parameters dynamically based on network conditions. The monitoring occasions and transmission times are adjusted according to the device's registration status in multiple networks and the actual timing of downlink transmissions, optimizing both interference avoidance and reception reliability.

Inventive Principle:

Principle #35Parameter changes

3Object-affected harmful factors

If the device transmits assistance information indication to select monitoring time, then the device can avoid conflicts with transmissions in the first network, but the device increases signaling overhead

Engineering Contradiction:

Improveconflicts with transmissionsVSAvoidsignaling overhead

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent applies partial action by transmitting assistance information indications only when necessary, such as when the device needs to coordinate monitoring between multiple networks. The indication provides sufficient information for the network to select appropriate monitoring times without requiring excessive detailed signaling, balancing conflict avoidance with signaling overhead.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS20250106820A1Communications device, infrastructure equipment, core network part and methods

Publication Date: 2025.03.27 SONY GROUP CORP

AI summary

A method of communicating using a communications device, the method comprises determining a plurality of time periods during which a paging message may be received in a first wireless network, entering a connected mode in a second wireless network, transmitting an assistance information indication in the second wireless network, entering an idle mode in the second wireless network, and while in the idle mode in the second wireless network, receiving in the second wireless network a paging message at a paging time, wherein the assistance information indication is for permitting the second wireless network to determine the paging time for transmitting the paging message such that the communications device is able to receive the paging message at the paging time and is not prevented from receiving a paging message transmitted in the first wireless network during any of the plurality of time periods.