Sharing PDU Sessions Between Subscriber Services

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Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently sharing protocol data unit (PDU) sessions between multiple subscriber services, leading to issues such as resource constraints and call failures.

Innovation Solution

A method and apparatus for a user equipment (UE) to establish and manage PDU sessions across multiple subscriber services, where a first subscriber service sets up a PDU session and a second subscriber service uses this session by registering with the same IP multimedia subsystem (IMS) network using a different IP address.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If each subscriber service establishes its own dedicated PDU session, then service reliability is improved, but device complexity and resource consumption increase

Engineering Contradiction:

Improveservice reliabilityVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges multiple PDU sessions into a single shared PDU session for multiple subscriber services. The UE establishes one PDU session that can be shared by multiple subscriber services, reducing the number of sessions from N (one per service) to 1 (shared), thereby reducing device complexity while maintaining service reliability through proper session management and IP address allocation mechanisms

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent implements a universal PDU session that serves multiple subscriber services simultaneously. A single PDU session is designed to be multi-functional, supporting multiple subscriber services through different IP addresses and proper routing, eliminating the need for dedicated sessions for each service while maintaining service independence and reliability

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If multiple PDU sessions are established for multiple subscriber services, then service independence is improved, but resource consumption increases

Engineering Contradiction:

Improveservice independenceVSAvoidresource consumption

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The patent combines multiple PDU sessions into a single shared session to reduce resource consumption. By merging the sessions, the UE reduces the number of protocol stacks, memory allocations, and processing operations required, directly lowering energy consumption and resource usage while maintaining service independence through logical separation via IP addresses

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent creates a universal PDU session that serves multiple subscriber services with different requirements. This multi-functional session allocates different IP addresses and routing paths for different services, ensuring service independence and adaptability while consuming fewer resources than multiple dedicated sessions would require

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Productivity

If PDU sessions are shared between multiple subscriber services, then resource efficiency is improved, but session management complexity increases

Engineering Contradiction:

Improveresource efficiencyVSAvoidsession management complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent segments the shared PDU session into distinct logical channels for different subscriber services. Each service is assigned a unique IP address and routing rule, creating clear segmentation within the shared session. This segmentation simplifies management by providing structured, identifiable pathways for each service while maintaining resource efficiency through sharing

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces an intermediary IP address allocation mechanism that mediates between the shared PDU session and multiple subscriber services. The system uses IP addresses as intermediaries to route traffic appropriately, simplifying session management by providing a clear, address-based routing mechanism rather than complex session-state tracking for each service

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12302273B2Techniques for sharing protocol data unit sessions between multiple subscriber services

Publication Date: 2025.05.13 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may establish, via a first subscriber service, at least one protocol data unit (PDU) session. The UE may receive a first internet protocol (IP) address associated with the first subscriber service. The UE may register the first subscriber service with an IP multimedia subsystem (IMS) network using the first IP address. The UE may register a second subscriber service with the IMS network using a second IP address, wherein the second subscriber service uses the at least one PDU session of the first subscriber service. Numerous other aspects are described.