PC5 V2X L2 ID Rotation for WTRU Session Privacy

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Solution Overview

Problem

Existing V2X communication technologies face challenges in maintaining privacy and security of Layer 2 (L2) identifiers during ongoing sessions, particularly in scenarios where the L2 IDs are tracked or linked, leading to potential privacy issues and inefficiencies in updating multiple sessions simultaneously.

Innovation Solution

Implementing a method where source and peer WTRUs periodically update their L2 identifiers using privacy parameters, such as a privacy timer, and communicate new L2 IDs through enhanced procedures like keepalive messages or re-keying, ensuring secure and synchronized changes across all sessions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If L2 IDs are used for V2X communication, then communication between WTRUs is enabled, but privacy is compromised due to tracking and linking of L2 IDs

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidprivacy loss

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent implements dynamic L2 ID changes during ongoing V2X sessions. The source WTRU generates new L2 IDs periodically or upon trigger events, and the peer WTRU is notified through enhanced keepalive messages or privacy procedures. This dynamic identification allows communication to continue while preventing tracking and linking of the WTRU's location and behavior patterns.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent employs periodic L2 ID updates based on timer expiration or trigger events. The source WTRU periodically generates new L2 IDs and communicates them to the peer WTRU using enhanced keepalive messages. This periodic action ensures that L2 IDs are refreshed at regular intervals, maintaining privacy while ensuring communication reliability through synchronized updates.

Inventive Principle:

Principle #19Periodic action

2Object-affected harmful factors

If L2 IDs are updated frequently to maintain privacy, then privacy protection is improved, but communication efficiency deteriorates due to multiple update messages

Engineering Contradiction:

Improveprivacy protectionVSAvoidcommunication efficiency

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The patent merges L2 ID update messages with existing keepalive procedures. Instead of sending separate update messages, the new L2 ID is communicated within the periodic keepalive message that is already being exchanged to maintain the connection. This merging eliminates additional signaling overhead and maintains communication efficiency while achieving frequent L2 ID updates for privacy protection.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The enhanced keepalive message serves multiple functions: it maintains the connection state, confirms receipt of messages, and communicates new L2 ID information. This multi-functionality allows the same message to accomplish several tasks simultaneously, reducing the number of separate messages needed and improving overall communication efficiency during L2 ID updates.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Object-affected harmful factors

If L2 IDs are changed during ongoing sessions, then privacy is enhanced, but session synchronization becomes complex between source and peer WTRUs

Engineering Contradiction:

Improveprivacy enhancementVSAvoidsession synchronization complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent implements feedback mechanisms where the peer WTRU sends confirmation messages upon receiving new L2 ID information. The source WTRU generates a new L2 ID, communicates it through an enhanced keepalive or privacy procedure, and receives acknowledgment from the peer WTRU. This feedback loop ensures that both WTRUs are synchronized in their knowledge of the current L2 ID, maintaining session consistency while enabling privacy-enhancing updates.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20250247681A1PROCEDURES ENABLING PRIVACY FOR WTRUs USING PC5 COMMUNICATION

Publication Date: 2025.07.31 INTERDIGITAL PATENT HOLDINGS INC

AI summary

Methods, devices, and systems for changing a layer 2 (L2) identifier (ID) during an ongoing vehicle-to-everything (V2X) session between a source wireless transmit/receive unit (WTRU) and a peer WTRU include communicating between the source and a peer WTRUs based on an existing layer 2 (L2) identifier (ID). On a condition that a trigger event occurs, the source WTRU generates a new source L2 ID, communicates the new source L2 ID to the peer WTRU, receives from the peer WTRU a message that responds to the new source L2 ID, and communicates between the source WTRU and the peer WTRU based on the new source L2 ID.