Pilot Signal Mapping for Low Latency Wireless Communication
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Solution Overview
Problem
Existing radio communication systems face challenges in reducing processing time for channel estimation, which increases delay and makes it difficult to achieve low latency required for certain data services.
Innovation Solution
A radio communication apparatus that dynamically maps pilot signals adjacent to data that requires low latency, allowing for reduced processing time through efficient channel response estimation by employing a pilot signal generating section, a data category determining section, a pilot insertion control section, and a multiplexing section to manage pilot signal placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pilot signals are mapped with wide time interval to reduce pilot overhead for moderate time variation, then transmission efficiency is improved, but processing time for channel estimation increases causing delay
Solution Approach 1:
The patent applies preliminary action by mapping at least one pilot signal adjacent to data that does not allow delay before the actual data transmission. This allows the receiver to perform channel estimation using the adjacent pilot signal immediately, without waiting for subsequent pilot signals, thereby reducing processing time and achieving low latency for delay-sensitive data while maintaining transmission efficiency through reduced pilot overhead.
2Measurement precision
If interpolation processing is performed in time domain and frequency domain to estimate channel response, then channel estimation accuracy is improved, but processing complexity and time increase
Solution Approach 1:
The patent applies local quality by making the pilot signal mapping pattern adaptive to different data categories. For data that does not allow delay, pilot signals are mapped adjacent to the data to enable immediate channel estimation with reduced processing. For other data, conventional mapping patterns with wider intervals can be used. This localized optimization reduces processing complexity for delay-sensitive transmissions while maintaining channel estimation accuracy where needed.
3Productivity
If the amount of pilot signals is reduced to improve throughput, then spectral efficiency is improved, but channel estimation reliability deteriorates
Solution Approach 1:
The patent ensures channel estimation reliability by mapping at least one pilot signal adjacent to data that does not allow delay, enabling immediate and reliable channel estimation without relying on interpolation from distant pilot signals. For other data transmissions, the reduced pilot signaling improves spectral efficiency. This selective approach maintains reliability for critical data while improving overall throughput.
Solution Approach 2:
The patent applies different pilot signaling strategies to different data categories: for delay-sensitive data, adjacent pilot mapping ensures reliable channel estimation; for other data, reduced pilot signaling improves spectral efficiency. This localized quality adjustment maintains channel estimation reliability where needed while improving overall system throughput.
Data Source
AI summary
A wireless communication apparatus and a wireless communication method wherein even when the permissible delay amount of data is small, the permissible delay thereof can be satisfied. A data type determining part determines whether the delay of transport data or control information should be allowed or not. A pilot signal insertion control part decides, based on pilot insertion interval information and allowable delay information, that a pilot signal is placed adjacently to data that is not allowed to delay. A multiplexing part multiplexes encoded and modulated transport data with the pilot signal generated by a pilot signal generating part in such a manner that realizes the placement decided by the pilot signal insertion control part.