Uplink Timing Advance Quantization for Precise LTE Coverage Analysis
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Solution Overview
Problem
Current transmission timing adjustment mechanisms in LTE systems have adverse impacts on the accuracy of network planning and optimization, particularly in areas with varying cell densities and coverage requirements, leading to low identifiability and precision in coverage maps.
Innovation Solution
A method and device for transmission timing adjustment that involves determining a transmission delay between user equipment and a base station, generating a timing advance (TA) quantized value with improved quantization precision, comprising a base value and an offset value, and sending this value for uplink transmission timing adjustment, enhancing precision to 1/30.72 µs units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional transmission timing adjustment mechanism is used, then uplink synchronization is maintained, but quantization precision is insufficient for accurate network planning and optimization
Solution Approach 1:
The timing advance command is segmented into a base value (occupying most bits) and an offset value (occupying remaining bits). The base value provides coarse timing adjustment with quantization precision of M×Ts, while the offset value provides fine timing adjustment with quantization precision of N×Ts. This segmentation resolves the contradiction by achieving high measurement precision through multi-level quantization while maintaining manageable device complexity through structured command design.
Solution Approach 2:
The invention changes the quantization parameter structure by introducing two different quantization precisions (M×Ts and N×Ts) instead of a single uniform precision. The base value uses coarser quantization (M×Ts where M≤16) for efficiency, while the offset value uses finer quantization (N×Ts where N<M) for precision. This parameter change enables high measurement precision for network planning while keeping the overall command structure efficient and manageable.
2Measurement precision
If finer quantization precision is applied to transmission timing adjustment, then network planning accuracy improves, but signaling overhead increases
Solution Approach 1:
The timing advance command is divided into base value and offset value components with different quantization precisions. The base value uses coarser quantization (M×Ts) requiring fewer bits, while the offset value uses finer quantization (N×Ts) requiring additional but limited bits. This segmentation resolves the contradiction by providing high measurement precision where needed (through the offset) while minimizing overall signaling overhead (through the efficient base value structure).
Solution Approach 2:
Different parts of the timing advance command have different quantization qualities: the base value uses coarser quantization suitable for general timing adjustment, while the offset value uses finer quantization specifically for precise network planning and optimization scenarios. This local quality differentiation achieves high measurement precision for critical functions while minimizing overall signaling overhead.
Data Source
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AI summary
Embodiments of the present invention provide a transmission timing adjustment method and device. The method includes: determining, by a base station, a transmission delay between user equipment UE and the base station; generating, a timing advance TA quantized value according to the transmission delay, where the TA quantized value includes a base value and an offset value, quantization precision of the base value is first quantization precision MTs, quantization precision of the offset value is second quantization precision NTs, M is a positive integer less than or equal to 16, N is a nonnegative integer less than M, and Ts is a minimum time unit in a Long Term Evolution LTE system and has a value of 1/30.72 µs; and sending, by the base station, the TA quantized value to the UE, where the TA quantized value is used for uplink transmission timing adjustment of the UE. The embodiments facilitate network planning and optimization.