Token-Based Anonymity in Push-to-Talk Communication Systems
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Solution Overview
Problem
Current push-to-talk over cellular (PoC) systems lack effective mechanisms to maintain user anonymity, particularly in scenarios where control plane/user plane signalling systems complicate the process of hiding user identities from recipients while still transmitting identities to intermediaries, and there is a need to log user activities for legal purposes.
Innovation Solution
A communication system that includes a controlling server and participating servers, where a token is inserted into connection requests to route user plane messages, allowing the controlling server to detect and manage anonymity requests, and remove identifying information from messages when necessary, ensuring user privacy while maintaining logs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If user plane messages are routed directly from controlling server to user equipment, then communication efficiency is improved, but user anonymity cannot be maintained as the participating server cannot log user activities
Solution Approach 1:
The patent introduces a token-based intermediary mechanism where the participating server inserts a token into connection requests, enabling it to act as a mediator that can log user activities while still allowing efficient direct routing of user plane messages between the controlling server and user equipment
2Reliability
If user identities are transmitted to all servers for logging purposes, then legal compliance is improved, but user privacy is compromised as recipients can identify users
Solution Approach 1:
The patent applies local quality by enabling the participating server to selectively log user identities for legal compliance purposes while simultaneously removing or obscuring identifying information from messages transmitted to recipients, thus maintaining different quality characteristics in different parts of the system
3Loss of information
If control plane signalling includes detailed user identity information, then user activity logging is improved, but message transmission complexity increases due to anonymity management requirements
Solution Approach 1:
The patent extracts user identity information from the main message flow by handling it separately through the token mechanism in control plane signalling, allowing the participating server to log user activities while keeping the user plane messages simpler and more efficient
Data Source
AI summary
A communication system comprising: a first and second user equipment for communication over a shared floor; a controlling server for managing the shared floor; and at least one participating server for serving said first user equipment; the participating server being arranged to detect a connection request from said first user, and to insert into the connection request from the first user equipment a token; and wherein the controlling server is arranged to detect said inserted token and to route user plane messages via the participating server responsive to said received token.