IMS Conference Privacy via SIP Event Subscription

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In legacy IP Multimedia Subsystem (IMS) conference call systems, non-initiator User Equipments (UEs) lack privacy as they are not notified about new participants or changes in existing participants, leading to potential data exposure when added or removed from conference calls.

Innovation Solution

Implementing a mechanism where the initiator UE provides non-initiator UEs with information to subscribe to conference events, using SIP messages like REFER, SUBSCRIBE, UPDATE, OPTIONS, and NOTIFY to share participant lists and conference URIs, ensuring all UEs are informed about changes in conference call participants.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If non-initiator UEs are added to conference calls without notification, then conference call setup is simplified and faster, but participant privacy is compromised and data exposure occurs

Engineering Contradiction:

Improveconference call setup efficiencyVSAvoidparticipant privacy

Core Design Contradiction:

ProductivityVSLoss of information

Solution Approach 1:

The patent implements a feedback mechanism where the initiator UE subscribes to conference events and receives notifications about participant changes. This subscription-based feedback loop ensures that the initiator is informed of any additions or removals of non-initiator UEs, enabling privacy protection while maintaining efficient conference setup.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent introduces an intermediary notification mechanism where the network or conference server acts as a mediator between the initiator UE and non-initiator UEs. This intermediary sends notifications to the initiator about participant changes, resolving the contradiction by enabling both efficient setup and privacy protection through indirect information sharing.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If initiator UE receives real-time notifications about participant changes, then participant privacy is protected, but system complexity and signaling overhead increase

Engineering Contradiction:

Improveprivacy protectionVSAvoidsignaling mechanism complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent leverages existing SIP protocol mechanisms (SUBSCRIBE, NOTIFY, REFER messages) that are already part of the IMS architecture. By using these universal, multi-functional signaling primitives for conference event notification, the system achieves reliable privacy protection without introducing entirely new complex signaling mechanisms.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The initiator UE autonomously subscribes to conference events and manages its own notification reception. This self-service approach enables the initiator to independently protect its privacy knowledge without requiring complex centralized control mechanisms, reducing overall system complexity while maintaining reliability.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS20240380798A1Technologies for conference calls with privacy control

Publication Date: 2024.11.14 APPLE INC

AI summary

The present application relates to devices and components, including apparatus, systems, and methods for creating an Internet protocol multimedia subsystem (IMS) conference call with privacy controls.