Early Timing Advance Acquisition for Wireless Handover
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Solution Overview
Problem
Current wireless communication systems face delays and increased signaling overhead during cell handover processes, particularly in lower layer triggered mobility scenarios, where wireless devices need to switch cells for improved coverage or handover, as they rely on individual timing advance acquisition indications for each preamble transmission.
Innovation Solution
The implementation of an early timing advance procedure, where a wireless device initiates synchronization with a target cell by sending multiple preambles based on an early timing advance acquisition indication, reducing the need for separate indications for each preamble and minimizing delay by synchronizing with the target cell before the actual cell switch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual timing advance acquisition indications are sent for each preamble transmission, then timing synchronization accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent applies preliminary action by enabling the wireless device to send multiple preambles in advance based on a single early timing advance acquisition indication before the actual handover occurs. This preliminary synchronization reduces the need for subsequent individual timing advance indications, thereby reducing signaling overhead while maintaining timing synchronization accuracy through the initial early timing advance acquisition
Solution Approach 2:
The early timing advance acquisition indication serves multiple functions: it provides timing advance information for multiple preamble transmissions, enables preliminary synchronization for handover, and reduces the need for separate timing advance indications. This multi-functionality resolves the contradiction by achieving timing synchronization accuracy through a single indication that serves multiple purposes
2Loss of time
If cell switching is performed quickly, then handover delay is reduced, but timing synchronization accuracy may deteriorate
Solution Approach 1:
The patent performs timing advance acquisition in advance before the actual handover occurs. The wireless device receives the early timing advance acquisition indication and sends preambles preliminarily, completing timing synchronization before the cell switch. This allows quick handover execution without compromising timing synchronization accuracy
Solution Approach 2:
The handover process is segmented into distinct phases: early timing advance acquisition phase (before handover) and actual handover execution phase. By separating the timing synchronization step from the cell switching step, the system can perform quick handover while maintaining timing synchronization accuracy through the preliminary acquisition phase
Data Source
AI summary
A wireless device may change cells. The wireless device may be provided with an early timing advance indication, before changing cells, that may indicate a repetition number. The repetition number may indicate a number of preamble transmissions the wireless device may make. To change cells the wireless device may repeat transmission of a preamble, to a target cell, a number of times corresponding to the repetition number.