Shared AP Transmission Power Control for WLAN Spatial Reuse
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Solution Overview
Problem
In wireless local area networks (WLANs), existing technologies face challenges in efficiently managing interference between access points (APs) when using the same time-frequency resources, which affects data transmission quality.
Innovation Solution
A method is proposed where a shared access point determines transmission power for data transmission to different stations (STAs) based on path loss information, acceptable receiver interference level (ARIL) information, and the transmission power value of a previous physical protocol data unit (PPDU), thereby reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple access points transmit data using the same time-frequency resources through spatial reuse, then resource utilization efficiency is improved, but interference between access points increases
Solution Approach 1:
The patent dynamically adjusts transmission power parameters based on path loss information and acceptable receiver interference level (ARIL) to enable spatial reuse while controlling interference. By changing the power parameter adaptively, multiple APs can transmit simultaneously on the same time-frequency resources without causing excessive interference to each other.
Solution Approach 2:
The system implements feedback mechanisms where access points exchange path loss information and ARIL values with each other. This feedback loop allows APs to adjust their transmission power based on real-time interference conditions, enabling coordinated spatial reuse. The feedback includes transmitting power values and ARIL parameters that guide power control decisions.
2Reliability
If transmission power is increased to improve signal quality, then data transmission quality is improved, but interference to other access points increases
Solution Approach 1:
The patent adjusts transmission power parameters based on path loss information and ARIL values to achieve optimal signal quality while minimizing interference. By dynamically changing the power parameter according to channel conditions and interference tolerance, the system maintains reliable transmission without generating excessive harmful interference to neighboring APs.
Solution Approach 2:
The system applies different transmission power levels to different spatial locations and AP pairs based on their specific path loss characteristics and interference conditions. Each AP transmits at a power level optimized for its local environment and target STA, rather than using a uniform power level, thereby achieving local quality optimization that balances signal quality and interference reduction.
3Object-affected harmful factors
If transmission power is decreased to reduce interference, then interference between access points is reduced, but data transmission quality deteriorates
Solution Approach 1:
The patent dynamically adjusts transmission power parameters based on path loss information and ARIL values to achieve the minimum necessary power for acceptable transmission quality. By changing the power parameter adaptively rather than using fixed low power, the system reduces interference while maintaining sufficient signal quality for reliable data transmission.
Solution Approach 2:
The system implements dynamic power control where transmission power levels are continuously adjusted based on real-time path loss measurements and ARIL feedback. This dynamic approach allows the system to use higher power when channel conditions are poor or interference tolerance is high, and lower power when conditions are favorable, thereby maintaining transmission quality while minimizing interference.
Data Source
AI summary
In a wireless local area network (LAN) system, a shared AP may determine PPDU transmission power to be transmitted to an STA on the basis of an ARIL of the STA, transmission power of a signal transmitted to the STA by a sharing AP, and an RSSI of a signal received from the sharing AP by the STA.