L1/L2 Triggered Mobility with Early Timing Advance Alignment

The patent applies preliminary action by acquiring timing advance (TA) information before the actual handover occurs. The UE receives TA values from the target cell in advance during mobility procedures, allowing the UE to prepare uplink synchronization ahead of time. This preliminary TA acquisition eliminates the need for random access procedures after handover, significantly reducing handover latency while maintaining reliable connection establishment.

The patent merges the TA acquisition process with existing mobility procedures. Instead of implementing a separate complex TA acquisition mechanism, the TA information is integrated into messages already exchanged during handover (such as RRC reconfiguration messages). The UE utilizes existing protocol structures to receive and apply TA values, achieving fast handover without adding significant procedural complexity or requiring new signaling mechanisms.

The patent extracts the essential TA information from complex conditional handover signaling sequences. By identifying and utilizing only the critical TA parameters needed for rapid handover execution, the patent reduces signaling overhead while maintaining the robustness benefits of conditional handover. The UE applies extracted TA values directly without requiring extensive additional signaling exchanges.