Early Timing Advance Acquisition for Low-Latency Handover
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing handover processes, particularly in scenarios involving rapid changes in network conditions, leading to increased latency and reduced performance due to suboptimal timing advance adjustments.
Innovation Solution
Implementing early timing advance (TA) acquisition mechanisms during L1/L2 triggered mobility procedures to enhance handover efficiency by anticipating and adjusting timing advance settings proactively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional timing advance adjustment mechanisms are used during handover, then the system maintains simplicity in procedure, but handover latency increases and performance deteriorates in dynamic network conditions
Solution Approach 1:
The patent implements early timing advance acquisition by performing timing advance measurements and adjustments before the actual handover event. The UE measures timing advance from the target base station during the handover preparation phase, allowing the timing to be pre-adjusted so that when handover occurs, the timing is already optimized, thereby reducing handover latency without significantly increasing procedure complexity
Solution Approach 2:
The patent applies beforehand cushioning by pre-acquiring timing advance information and maintaining a buffer of timing adjustment data before handover. This allows the system to have timing advance values ready in advance, cushioning against the latency that would otherwise occur during the handover execution phase
2Reliability
If early timing advance acquisition is implemented, then handover performance and network stability improve, but the complexity of the mobility management system increases
Solution Approach 1:
The system performs timing advance measurements and acquisitions in advance during the handover preparation phase, before the actual handover execution. This preliminary action allows the UE to have timing advance information ready, improving network stability and handover reliability while managing complexity by organizing the additional measurements in a structured, phased manner
Solution Approach 2:
The patent implements feedback mechanisms where the UE measures timing advance from the target base station and reports this information back to the network. The network uses this feedback to optimize handover parameters and timing adjustments, improving reliability through continuous monitoring and adjustment while managing complexity through automated feedback loops
3Productivity
If timing advance adjustments are delayed until handover execution, then the procedure remains simple, but latency increases and performance suffers in rapid network condition changes
Solution Approach 1:
The patent performs timing advance acquisition and adjustment as a preliminary action during the handover preparation phase, before handover execution. The UE measures timing advance from the target base station and pre-adjusts its timing, so when handover occurs, the timing is already optimized. This improves handover efficiency and productivity by eliminating timing adjustment delays during execution
Solution Approach 2:
The patent implements dynamic timing advance adjustment by continuously monitoring network conditions and updating timing advance values based on current measurements. The system adapts timing adjustments to changing network conditions, improving productivity in dynamic environments while managing complexity through adaptive, condition-based adjustments rather than static procedures
Data Source
AI summary
A second base station distributed unit receives, from a base station central unit, a user equipment context setup or modification request message indicating a request for a parameter, of an early timing advance, ETA, acquisition, indicating a radio resource of a cell, and sends, to the base station central unit, the parameter of the ETA indicating the radio resource.