Differential Power Control for Distributed Tone Resource Units in 6 GHz LPI Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In 6 GHz low-power indoor (LPI) systems, the strict power spectral density (PSD) requirements result in lower transmission power and shorter coverage range, limiting the maximum transmission power for extremely-high-throughput (EHT) short training field (STF) and data/long training field (LTF) symbols.
Innovation Solution
The method involves distributing subcarriers of a resource unit (RU) over a physical protocol data unit (PPDU) bandwidth or frequency subblock to generate distributed-tone RUs (dRUs) and distributed multi-resource units (dMRUs), with transmission power control applied such that EHT-STF symbols are transmitted with a first power and EHT-LTF and payload symbols are transmitted with a second power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If distributed-tone RUs (dRUs) are used to improve coverage range, then transmission power can be increased, but the power spectral density (PSD) requirements are violated
Solution Approach 1:
The patent segments the transmission power control into different parts: EHT-STF symbols use one power level while EHT-LTF and data symbols use another power level. This segmentation allows the system to meet PSD requirements for training fields while using higher power for data transmission, thereby improving coverage without violating spectral density constraints.
Solution Approach 2:
The patent applies different power qualities to different symbol types locally. Specifically, EHT-STF symbols are transmitted with a first power level optimized for PSD compliance, while EHT-LTF and data symbols are transmitted with a second, potentially higher power level optimized for coverage and throughput. This local differentiation resolves the contradiction between PSD requirements and coverage needs.
2Object-affected harmful factors
If maximum transmission power is limited by EHT-STF power to meet PSD requirements, then PSD compliance is achieved, but the maximum transmission power for uplink trigger-based PPDU is restricted
Solution Approach 1:
The patent divides the PPDU transmission into segments with different power allocations: EHT-STF symbols are controlled to meet PSD requirements, while EHT-LTF and data symbols are allowed to use higher power levels. This segmentation enables the system to maintain PSD compliance for training fields while maximizing transmission power for actual data transmission, thereby resolving the power restriction issue.
Solution Approach 2:
The patent applies different power qualities to different portions of the transmission. EHT-STF symbols use a conservative power level for PSD compliance, while EHT-LTF and data symbols use an aggressive power level for maximum coverage. This local quality differentiation allows the system to satisfy both PSD requirements and maximum power needs simultaneously.
Data Source
AI summary
Various schemes pertaining to transmission power control (TPC) for distributed-tone resource units (dRUs) and distributed multi-resource units (dMRUs) in 6 GHz low-power indoor (LPI) systems are described. A communication entity distributes subcarriers of a resource unit (RU) and a multi-RU over a physical-layer protocol data unit (PPDU) bandwidth or a frequency subblock of a bandwidth to generate a dRU and a dMRU associated with an uplink (UL) trigger-based (TB) PPDU comprising at least an extremely-high-throughput (EHT) short training field (EHT-STF), an EHT long training field (EHT-LTF), and a payload of data. The communication entity then transmits the dRU or dMRU associated with the UL TB PPDU with transmission power control such that symbols associated with the EHT-STF are transmitted with a first power and symbols associated with the EHT-LTF and the payload are transmitted with a second power.