Distributed-tone Resource Units for Partial Bandwidth Utilization
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Solution Overview
Problem
Current designs for distributed-tone resource units (RUs) in 6 GHz low-power indoor (LPI) systems face challenges in efficiently utilizing partial bandwidths, particularly due to stringent regulatory limits on equivalent isotropically radiated power (EIRP) in the 6 GHz band.
Innovation Solution
The proposed solution involves distributing a plurality of subcarriers of a RU to generate distributed-tone RUs (dRUs) over a partial bandwidth, allowing for efficient communication using these dRUs in a 6 GHz LPI system. This is achieved through a specific tone distribution pattern and tone mapping range, enabling effective utilization of partial bandwidths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If distributed-tone RUs are used to spread subcarriers over wider bandwidth to boost transmit power, then coverage range is extended, but regulatory EIRP limits in 6 GHz LPI band constrain the achievable power boost
Solution Approach 1:
The patent segments the 80 MHz bandwidth into multiple 20 MHz subblocks and further divides RUs into distributed-tone units. By distributing subcarriers across multiple frequency subblocks rather than concentrating them, the system achieves power spectral density spreading that boosts effective transmit power while maintaining compliance with EIRP limits. Specifically, dRUs distribute tones across non-contiguous frequency resources, and dMRUs combine multiple dRUs across subblocks, enabling the system to overcome the EIRP constraint through frequency diversity.
2Productivity
If 20 MHz operating STAs use rRU or dRU on one 20 MHz frequency subblock, then transmission is simplified, but the remaining 60 MHz bandwidth is underutilized
Solution Approach 1:
The patent creates a universal dRU/dMRU framework that can operate across multiple bandwidth configurations. The same dRU structure can be deployed in 20 MHz, 40 MHz, 60 MHz, or 80 MHz systems, providing multi-functionality. In 80 MHz systems, dRUs can be configured to occupy different numbers of subblocks (1, 2, 3, or 4), and dMRUs can aggregate multiple dRUs across subblocks, allowing the system to universally handle various bandwidth scenarios while maintaining efficient spectral utilization.
3Power
If dRUs are designed to distribute tones across partial bandwidth, then power spectral density is improved, but tone distribution pattern complexity increases
Solution Approach 1:
The patent implements a nested structure where dRUs are composed of distributed subcarriers within frequency subblocks, and dMRUs are formed by aggregating multiple dRUs across multiple subblocks. This nested organization allows systematic management of tone distribution complexity. The hierarchical structure (subcarriers → dRUs → dMRUs → frequency subblocks) enables scalable deployment where the same basic dRU pattern can be nested across different bandwidths, reducing overall system complexity while achieving power spectral density improvement.
Data Source
AI summary
Various schemes pertaining to designs of distributed-tone resource units (dRUs) on a partial bandwidth in a 6 GHz low-power indoor (LPI) system are described. An apparatus distributes a plurality of subcarriers of a resource unit (RU) to generate a dRU over a partial bandwidth of a bandwidth. The apparatus then communicates with a communication entity using the dRU.