Relay Node MAC Address Conflict Detection in WTRU-to-WTRU PC5 Links

The patent performs MAC address conflict detection during the PC5 link establishment procedure before actual data transmission begins. The Relay node checks for MAC address conflicts by comparing the MAC address of the source end WTRU with MAC addresses of other connected WTRUs, and similarly checks target end WTRU MAC addresses. This preliminary detection prevents subsequent traffic forwarding issues while maintaining efficient link setup.

The patent implements self-service mechanisms where the Relay node autonomously detects MAC address conflicts and initiates resolution procedures without external intervention. When a conflict is detected, the Relay node automatically requests new MAC addresses from the conflicting WTRUs or triggers link identifier update procedures. This self-managing approach ensures reliable traffic forwarding while keeping the complexity localized to the Relay node's control logic.

The patent applies local quality by implementing MAC address conflict detection and resolution only at the Relay node level where it is most needed for traffic forwarding decisions. The Relay node performs localized conflict detection by comparing MAC addresses within its connected WTRU set, and resolves conflicts by requesting new MAC addresses only from the specific WTRUs involved in conflicts rather than requiring network-wide changes. This localized approach ensures MAC address uniqueness while minimizing communication overhead.