PLMN-Based Relay UE Selection for NR Relay Compatibility

The patent applies preliminary action by having the remote UE obtain and store PLMN configuration information and relay UE identification information in advance before establishing a relay connection. The remote UE pre-filters candidate relay UEs based on PLMN matching criteria, so that when relay connection establishment is needed, only compatible relay UEs are considered, thereby maintaining both ease of operation and reliability.

The patent applies segmentation by dividing the relay UE selection process into distinct stages: first obtaining PLMN configuration information, then obtaining candidate relay UE information, next filtering candidates based on PLMN matching, and finally selecting from the filtered list. This segmentation transforms a complex single-step selection into manageable sequential steps, reducing overall process complexity while maintaining compatibility.

The patent applies preliminary action by having the remote UE obtain and cache PLMN configuration information and candidate relay UE information in advance, before actual relay connection establishment. This pre-fetching and pre-filtering approach reduces the time required at the moment of connection establishment, as the filtering logic has already identified compatible candidates beforehand, thus reducing selection time while maintaining service reliability.