Cross-Cell Random Access Timing for Fast Wireless Handover

The patent applies preliminary action by performing L1/L2 measurements and preparing handover parameters before the actual handover is needed. The UE continuously monitors reference signals from neighboring cells and pre-calculates timing advance values, so that when handover is triggered, the execution can proceed immediately without waiting for measurement reporting and parameter configuration, thus reducing handover delay while maintaining reliable handover capability

The patent extracts the measurement and decision-making functions from the L3 layer and places them at the L1/L2 layer. By moving the measurement processing and handover decision capabilities to lower layers, the patent eliminates the need for L3 measurement reporting and RRC reconfiguration signaling, thereby reducing signaling overhead and acceleration handover execution while preserving handover reliability

The patent extracts measurement and decision functions from L3 to L1/L2, eliminating the need for L3 measurement reports and RRC reconfiguration messages. The UE autonomously performs measurements at L1 and processes them at L2, directly generating handover commands without L3 intervention, thereby drastically reducing uplink and downlink signaling overhead while maintaining handover capability through distributed intelligence

The patent enables self-service by allowing the UE to autonomously perform measurements, evaluate handover conditions, and execute handover decisions without requiring continuous L3 layer control. The UE independently monitors reference signals, calculates timing advance values, and triggers handover based on pre-configured criteria, eliminating the need for extensive L3 signaling exchange and reducing overall signaling overhead

The patent applies preliminary action by pre-configuring handover parameters including target cell information and timing advance values before handover execution. The UE continuously maintains measurement data and prepares handover parameters in advance, so that when handover is triggered, the actual switching can occur rapidly without waiting for parameter negotiation, thereby reducing interruption time while ensuring reliable handover through pre-validated parameters

The patent substitutes the mechanical L3-based handover execution mechanism with an automated L1/L2-based system. By replacing the multi-step L3 signaling process with direct L1/L2 layer operations, the patent eliminates processing delays and signaling wait times, reducing interruption time while maintaining handover capability through lower-layer automation

The patent applies preliminary action by pre-calculating and preparing timing advance values for target cells before handover execution. The UE uses reference signal measurements from the target cell to estimate the required timing advance, and this pre-computed value is applied immediately upon handover, enabling fast synchronization without requiring post-handover timing adjustment procedures, thus maintaining uplink synchronization reliability while achieving fast handover speed

The patent introduces timing advance values as an intermediary parameter that bridges the fast handover process and uplink synchronization requirement. By using pre-calculated timing advance values derived from reference signal measurements, the patent enables the UE to rapidly adjust its uplink transmission timing to match the target cell's synchronization requirements, thereby maintaining synchronization reliability during high-speed handover