NTN Repetition Segmentation for Timing Advance Synchronization
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Solution Overview
Problem
In non-terrestrial networks (NTN), the accumulation of timing advance (TA) errors due to mobility of network devices leads to out-of-synchronized communication, particularly in IoT systems with low signal-to-noise ratios, affecting communication efficiency.
Innovation Solution
A communication method that determines repetition segment duration based on the beam elevation angle of the terminal device, using a mapping relationship to ensure synchronization, and adjusts repetition segment durations to accommodate timing advance errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the maximum allowed time-continuous transmission duration is increased to improve communication efficiency, then the transmission duration is extended, but the accumulated TA error increases causing out-of-synchronized communication
Solution Approach 1:
The patent divides the continuous transmission duration into multiple repetition segments. Each segment has a limited duration that does not exceed the maximum allowed time-continuous transmission duration, preventing excessive TA error accumulation. The transmission is segmented into segments with durations T1, T2, ..., TN where each Ti ≤ T_max, allowing the system to maintain synchronization while achieving extended total transmission time through multiple segments.
2Reliability
If the repetition segment duration is extended to improve signal-to-noise ratio, then the transmission reliability is improved, but the accumulated timing advance error increases
Solution Approach 1:
The patent dynamically adjusts the repetition segment duration based on the beam elevation angle of the terminal device. Different beam elevation angles map to different repetition segment durations through a predefined mapping relationship. This dynamic adaptation allows the system to optimize the balance between transmission reliability (signal-to-noise ratio) and timing accuracy for different spatial conditions, preventing excessive TA error accumulation in specific geometric configurations.
Data Source
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AI summary
Embodiments of this application provide a communication method. The method may include: receiving indication information, where the indication information indicates a first repetition segment duration, the first repetition segment duration is determined based on a first mapping relationship and a current beam elevation angle of a terminal device, and the first mapping relationship includes a correspondence between a beam elevation angle and repetition segment durations; and determining the first repetition segment duration based on the indication information and the first mapping relationship. According to the method, the repetition segment duration of a current information transmission is determined based on a beam elevation angle of the terminal device. This avoids out-of-synchronized communication due to an excessively large accumulated timing advance error caused by a communication device, so that communication efficiency is improved.