MAC PDU Identity Renewal for Secure Sidelink Retransmission

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Solution Overview

Problem

In inter-UE communication scenarios, particularly in sidelink communications, the lack of central node management leads to security threats due to potential exposure of user identities and compromised privacy, as listeners can infer updated identities from previous information, posing a risk of illegal tracking.

Innovation Solution

A method involving status reports and ID updates in MAC PDU groups ensures secure and reliable data transmission by using first and second IDs, where the first signaling indicates ID renewal, and the status report confirms unreceived data, allowing retransmission with new IDs to prevent tracking.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If ID updates are performed in inter-UE communication, then user security and privacy are improved, but listeners can infer updated identities from previous information leading to potential tracking

Engineering Contradiction:

Improveuser security and privacyVSAvoididentity exposure to listeners

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent extracts the identity information from the communication packets by using separate MAC PDU groups for different identities. The first MAC PDU group uses the first identity while the second MAC PDU group uses the second identity, effectively separating the identity exposure so that listeners cannot infer the updated identity from previous communications.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The communication data is segmented into multiple MAC PDU groups, each associated with a different identity. The first MAC PDU group is transmitted using the first identity and the second MAC PDU group is transmitted using the second identity, dividing the communication stream to prevent identity inference.

Inventive Principle:

Principle #1Segmentation

2Reliability

If status reports are used to confirm unreceived data, then data transmission reliability is improved, but transmission time and system overhead increase

Engineering Contradiction:

Improvedata transmission reliabilityVSAvoidtransmission time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The status report mechanism is activated preliminarily when ID updates occur, allowing the receiving UE to immediately confirm which MAC PDU groups were successfully received and which need retransmission. This preliminary confirmation prevents unnecessary retransmissions and optimizes the overall transmission time despite the additional status report exchange.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12413964B2Method and device used for wireless communication

Publication Date: 2025.09.09 BUNKER HILL TECHNOLOGIES LLC

AI summary

The present disclosure provides a method and a device used for wireless communications, comprising: transmitting a first transmission on a first SDU, including transmitting a first MAC PDU group; the first MAC PDU group at least comprises a first MAC PDU; receiving a first signaling and a first status report, the first signaling being used to indicate that a first ID is renewed as a second ID; the first status report is used to indicate that the first SDU is not received yet; and performing a second transmission on the first SDU, including transmitting a second MAC PDU group; the second MAC PDU group at least comprises a second MAC PDU; the first signaling is used to trigger the first status report. By transmitting the first SDU in a rational way, the present disclosure helps improve reliability and prevent risks in communications.