WTRU-to-WTRU Relay MAC Conflict Resolution
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Solution Overview
Problem
Existing procedures allow the establishment of a PC5 link between a source and target UE via a UE-to-UE Relay even when MAC addresses are not unique, leading to potential forwarding of traffic to the wrong UE or dropping of traffic due to non-unique MAC addresses.
Innovation Solution
A Relay node detects MAC address conflicts and requests new MAC addresses from source and target UEs, updates link identifiers, and restarts the PC5 link establishment process to ensure unique MAC addresses are used.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the PC5 link is established between source and target UE via Relay even when MAC addresses are not unique, then link establishment speed is improved, but traffic forwarding reliability deteriorates due to potential misdirection or dropping of traffic
Solution Approach 1:
The patent applies preliminary action by performing MAC address conflict detection during the PC5 link establishment phase, before actual data traffic is forwarded. The Relay node proactively checks for MAC address uniqueness and resolves conflicts by triggering link identifier updates or requesting new MAC addresses, ensuring that traffic forwarding reliability is maintained from the outset rather than correcting issues after they occur.
2Ease of operation
If the Relay forwards traffic based on non-unique MAC addresses, then ease of operation is improved by allowing flexible link establishment, but measurement precision deteriorates as the Relay cannot determine the correct destination PC5 link
Solution Approach 1:
The patent implements feedback by having the Relay node continuously monitor and detect MAC address conflicts, then respond by triggering link identifier updates (LIU) procedures or requesting new MAC addresses from the involved UEs. This feedback loop ensures that the Relay maintains accurate mapping between MAC addresses and PC5 links, enabling precise destination identification while preserving operational flexibility.
Data Source
AI summary
A relay node may detect conflicts regarding media access control (MAC) addresses. The relay node may receive a request to establish a links with a source node and a target node. The relay node may receive the MAC addresses of the source node and the target node. The relay node may detect a conflict associated with the MAC addresses of the source node and the target node. The relay node may release the link with the target node.