MUSIM Capability Signaling for Paging Collision Avoidance

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Solution Overview

Problem

Existing wireless communication systems face challenges in managing multiple subscriber identity module (SIM) cards, leading to conflicting configurations and suboptimal performance in wireless devices, particularly in handling paging causes, collision avoidance, and NAS busy indications across different wireless networks.

Innovation Solution

A framework for multi-SIM capability signaling is developed, enabling wireless devices to manage multiple SIM cards by optimizing features like paging causes, collision avoidance, and NAS busy indications, and supporting simultaneous connections to different wireless networks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple SIM cards are used to establish multiple connections to wireless networks, then network coverage and functionality are improved, but device complexity and configuration conflicts increase

Engineering Contradiction:

Improvemulti-SIM capabilityVSAvoidconfiguration management

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent segments the multi-SIM device into multiple independent SIM card modules, each capable of establishing separate connections to different wireless networks. This segmentation allows each SIM card to be managed independently, reducing configuration conflicts while maintaining the ability to connect to multiple networks simultaneously.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements a universal framework that enables a single wireless device to support multiple SIM cards with different capabilities and network types. The device can universally handle various wireless communication standards (GSM, UMTS, LTE, 5G) across multiple SIM cards, providing multi-functionality without proportionally increasing complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If multiple wireless network connections are maintained simultaneously, then network coverage and service availability are improved, but energy consumption increases

Engineering Contradiction:

Improvenetwork connection availabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements dynamic power management that adjusts the operational state of each SIM card based on current network conditions and device usage patterns. The system can dynamically activate or deactivate specific SIM cards and their corresponding network connections, maintaining reliable connectivity when needed while reducing power consumption during idle periods.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes operational parameters such as polling intervals, transmission power levels, and connection priority settings for each SIM card based on network conditions. By adjusting these parameters dynamically, the system maintains reliable network availability while optimizing energy consumption across multiple simultaneous connections.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If advanced features like paging collision avoidance and NAS busy indication are implemented, then communication reliability is improved, but device complexity increases

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidfeature implementation

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent introduces intermediary management functions that handle complex features like paging collision avoidance and NAS busy indication. These intermediary layers abstract the complexity from the core device operations, providing reliable communication features while maintaining manageable device architecture. The intermediary mechanisms coordinate between multiple SIM cards to prevent conflicts without requiring complex device-wide changes.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20250294491A1Systems and Methods for Multiple Universal Subscriber Identity Module (MUSIM) Capability Signaling and Enhanced Features

Publication Date: 2025.09.18 APPLE INC

AI summary

A technique for a wireless apparatus to receive, via a network interface, a multiple subscriber identity module (multi-SIM) capability message from a wireless device connected to a first wireless network; generate a registration accept signal in response to receiving the multi-SIM capability message, wherein the registration accept signal indicates a first set of features supported by the first wireless network; and send, via the network interface, the registration accept signal to the wireless device. The wireless apparatus may receive paging filtering information (PFI) from the wireless device and store the PFI for the wireless device. The wireless apparatus may receive a request from the wireless device to activate its user plane (UP) connection with the first wireless network, and receive an indication that the wireless device does not accept a paging message.