UE Handover Synchronization Using Timing Accuracy Estimation
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Solution Overview
Problem
In wireless communication networks, particularly during handover procedures, the target gNB lacks knowledge of the user equipment's current synchronization accuracy, leading to inefficient resource allocation and potential deviations from synchronization accuracy budgets, resulting in unnecessary conservative configurations and resource wastage.
Innovation Solution
The source gNB estimates the user equipment's timing information accuracy and shares this with the target gNB, allowing the target gNB to determine the necessary air interface parameters and synchronization procedures to maintain or improve synchronization accuracy within the budget, thereby optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the target gNB assumes worst-case synchronization accuracy during handover, then synchronization reliability is improved, but network resource efficiency deteriorates due to unnecessary conservative configurations
Solution Approach 1:
The source gNB performs preliminary estimation of the UE's timing information accuracy before handover and shares this information with the target gNB. This allows the target gNB to make informed decisions about synchronization resource allocation rather than assuming worst-case scenarios, thereby improving resource efficiency while maintaining reliability.
Solution Approach 2:
The system implements a feedback mechanism where the source gNB provides timing accuracy information to the target gNB during handover. This feedback loop enables the target gNB to adjust its synchronization configuration based on actual UE performance rather than conservative assumptions, resolving the contradiction between reliability and resource efficiency.
2Measurement precision
If the target gNB requests frequent reference time updates during handover, then synchronization accuracy is improved, but resource consumption increases
Solution Approach 1:
The source gNB estimates the UE's timing accuracy in advance and communicates this to the target gNB, enabling the target to determine appropriate reference time update frequencies based on actual UE capability rather than assuming the need for frequent updates. This reduces unnecessary resource consumption while maintaining required synchronization accuracy.
Solution Approach 2:
The system dynamically adjusts the reference time update frequency parameter based on the estimated timing accuracy of the UE. When accuracy is sufficient, update frequency is reduced; when accuracy degrades, frequency increases. This adaptive parameter adjustment resolves the contradiction between maintaining high synchronization accuracy and minimizing resource consumption.
3Device complexity
If the target gNB lacks timing accuracy information during handover, then device complexity is reduced, but productivity deteriorates due to inefficient resource allocation
Solution Approach 1:
The source gNB performs the complex task of timing accuracy estimation before handover and prepares this information in advance. This preliminary action reduces the information processing burden on the target gNB while enabling efficient resource allocation, thus resolving the contradiction between device complexity and productivity.
Solution Approach 2:
The source gNB acts as an intermediary that calculates and transmits timing accuracy information to the target gNB. This intermediary role allows the target gNB to make efficient resource allocation decisions without having to perform complex timing analysis itself, resolving the contradiction between maintaining low device complexity and achieving high productivity.
Data Source
AI summary
Improved techniques of handover include the source gNB estimating the accuracy of the timing information that the UE may derive from its local clock during and shortly after the HO procedure and exchange this with the target gNB. Based on this estimate, the target gNB can determine when a timing information update is needed at the UE.