6 GHz LPI RU Tone Mapping for Wider Wireless Coverage
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Solution Overview
Problem
Existing approaches to tone mapping in low power indoor (LPI) transmissions in the 6 GHz wireless band fail to provide adequate wireless coverage while adhering to strict power spectrum density (PSD) requirements, limiting transmission power and range.
Innovation Solution
Distribute resource unit (RU) tones over larger bandwidths using novel tone mapping techniques, such as interleaving or grouping, to achieve higher transmission power within PSD limits, allowing for approximately −1 dBm/MHz uplink and 5 dBm/MHz downlink communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional LDPC tone mapping is used with sufficient subcarrier separation, then frequency diversity and interference mitigation are achieved, but wireless coverage and transmission power are insufficient
Solution Approach 1:
The patent segments the tone distribution into multiple groups (e.g., 6 groups) within the distribution window, allowing tones to be spread across larger bandwidths while maintaining sufficient separation. This segmentation enables the system to achieve both frequency diversity through distributed tone placement and higher transmission power by utilizing broader frequency resources under LPI PSD constraints.
2Object-affected harmful factors
If LPI PSD requirements are strictly enforced, then interference with other 6 GHz transmissions is reduced, but transmission power and wireless coverage are limited
Solution Approach 1:
The patent transitions from conventional localized tone mapping to a distributed tone mapping approach that utilizes the frequency dimension more effectively. By distributing tones across a larger bandwidth (e.g., 80 MHz or 160 MHz distribution window) rather than concentrating them in smaller channels, the system spreads power spectral density across more frequency resources, achieving higher effective transmission power while maintaining LPI PSD compliance and reducing interference to other systems.
3Power
If tones are distributed over larger bandwidths, then transmission power within PSD limits is increased, but tone mapping complexity increases
Solution Approach 1:
The patent introduces specific parameters to control the tone distribution process: distribution window size (e.g., 80 MHz, 160 MHz), number of groups (e.g., 6 groups), and tones per group. By parameterizing the tone mapping process, the system can flexibly adjust the distribution characteristics to balance transmission power requirements against implementation complexity, allowing optimized configurations for different deployment scenarios.
Data Source
AI summary
Accordingly, embodiments of the present invention provide methods and devices for low power transmissions that provide improved wireless coverage for 6 GHz LPI transmissions using novel tone mapping techniques. Resource units (RUs) tones are distributed over larger bandwidths to achieve higher transmission power while operating within the PSD requirements of LPI. The tone distribution can include global tone mapping of smaller RUs distributed onto larger bandwidths, or group-based tone distribution methods, for example.