Methods and signaling procedures for direct end-to-end pc5 link support in layer 2 of ue-to-ue relay

Abstract

Signaling procedures may be established to provide support for direct end-to-end PC5 link establishment in Layer 2 (L2) of a UE-to-UE relay. According to a first option, the direct end-to-end L2 PC5 link between two remote UEs (communicating via a relay UE) in not identified by conventional L2 addresses, and one or more local L2 identifiers specific to the end-to-end L2 PC5 link may be used instead. According to a second option, the L2 IDs identifying the end-to-end L2 PC5 link may be the same L2 ID (s) used by the remote UEs for their respective PC5 links to the relay UE. According to a third option, L2 IDs, different from the respective L2 IDs used by the remote UEs for their respective PC5 links to the relay UE, may be established specifically to identify the end-to-end L2 PC5 link. Solutions addressing each option may include RRC procedures and / or PC5-Sprocedures for different direct end-to-end L2 PC5 link establishment approaches.

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