Multi-USIM Paging Cause Signaling for IMS Voice Reachability
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Solution Overview
Problem
Existing 4G/5G systems face challenges in efficiently managing network slicing and multi-access scenarios for wireless devices, particularly in handling simultaneous connections through both 3GPP and non-3GPP access networks, which affect user equipment reachability and service continuity.
Innovation Solution
The implementation of enhanced features and functionalities in 4G/5G systems, including support for network slicing, unified policy frameworks, and concurrent access to both 3GPP and non-3GPP networks, with mechanisms for seamless registration, connection management, and QoS flow differentiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wireless device supports concurrent connections to both 3GPP and non-3GPP access networks, then network access versatility is improved, but device complexity increases
Solution Approach 1:
The patent segments the network access functionality by separating 3GPP and non-3GPP access stacks into distinct modules within the wireless device. Each access type has its own protocol stack and management logic, allowing independent operation and reducing the complexity burden of supporting both simultaneously. The device can selectively activate only the required access stack based on network availability and service requirements.
Solution Approach 2:
The patent implements a unified network slicing management framework that works across both 3GPP and non-3GPP access networks. The network slice selection function and policy management mechanisms are designed to be access-agnostic, providing universal service continuity and resource allocation regardless of which access network is being used. This multi-functional approach allows the device to leverage a single management architecture for diverse access types.
2Reliability
If network slicing is implemented across multiple access networks, then service continuity is improved, but system complexity increases
Solution Approach 1:
The patent introduces a network slice selection function (NSSF) and unified policy management framework as intermediary layers between the access networks and core network functions. These intermediaries abstract the complexity of multi-access network slicing management, providing standardized interfaces for slice selection, resource allocation, and service continuity enforcement across 3GPP and non-3GPP accesses without requiring complex device-side implementation.
3Reliability
If seamless registration and connection management is implemented for multi-access scenarios, then user equipment reachability is improved, but processing time increases
Solution Approach 1:
The patent implements preliminary registration mechanisms where the wireless device performs advance registration with the network slice selection function and establishes connection context before actual data transmission is required. The device pre-configures network slice parameters, authentication credentials, and resource allocation policies during idle periods or initial network attachment, enabling faster connection establishment and reducing processing delays during active communication sessions.
Data Source
AI summary
A multi-USIM wireless device sends, to a mobility management function via a base station, a registration request message comprising a capability, of the multi-USIM wireless device, for a network to include a paging cause value in a paging message, wherein the paging cause value indicates internet protocol multimedia subsystem (IMS) voice service.