WLAN Terminal Power Control for Intra-BSS Spatial Reuse
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Solution Overview
Problem
In densely populated wireless LAN environments, the increased traffic leads to reduced TXOP acquisition times due to collisions and exposed nodes, affecting transmission efficiency in IEEE 802.11 standards, which are not fully addressed by existing Inter-BSS spatial reuse technologies.
Innovation Solution
A communication apparatus and method that adjusts transmit power based on allowable maximum power thresholds, allowing efficient spatial reuse within the same radio system by configuring transmit power according to received power levels and threshold values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Carrier Sense Multiple Access (CSMA)-based radio medium access is used in IEEE 802.11 specifications, then wireless LAN devices can access the radio medium, but time for TXOP acquisition is reduced due to collisions and exposed nodes in congested environments
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting transmit power levels based on received power measurements and threshold comparisons. The terminal apparatus modifies its transmission parameters (allowable maximum transmit power) according to the detected receive power level, enabling more efficient spatial reuse and reducing collisions in congested environments. This resolves the contradiction by optimizing the time parameter for TXOP acquisition through adaptive power control.
2Productivity
If frame aggregation (A-MSDU and A-MPDU) is introduced to improve throughput, then transmission efficiency increases, but probability of transmission error increases
Solution Approach 1:
The patent implements feedback mechanisms where the terminal apparatus measures received power levels and uses this information to adjust transmission parameters. The base station apparatus provides feedback information including allowable maximum transmit power values, enabling continuous optimization of transmission reliability while maintaining high throughput through frame aggregation. This feedback loop resolves the contradiction between throughput and transmission error probability.
3Productivity
If Inter-BSS spatial reuse technology is adopted in IEEE 802.11ax, then some collision problems are alleviated, but not fully addressed in densely populated environments
Solution Approach 1:
The patent applies local quality by implementing spatial reuse operations within the same radio system (BSS) rather than only between different BSSs. The terminal apparatus determines allowable maximum transmit power based on local receive power measurements, enabling differentiated transmission behavior for different spatial locations and scenarios. This local化的 approach more effectively addresses collisions and exposed nodes in densely populated environments while maintaining transmission efficiency.
Data Source
AI summary
A terminal apparatus includes a transmitter, and a receiver. The receiver receives SR link information including information of an allowable maximum transmit power. In a case that a receive power received by the receiver is equal to or less than a threshold, the transmitter transmits a transmission frame. In transmission of the transmission frame, a transmit power is configured to be equal to or less than the allowable maximum transmit power. In a case that the threshold is equal to or less than a first value, the allowable maximum transmit power is configured to a value indicated by the information of the allowable maximum transmit power. In a case that the threshold is larger than the first value and is equal to or less than a second value, the allowable maximum transmit power is configured to a value obtained based on the value indicated by the information of the allowable maximum transmit power and the threshold.