Wi-Fi Access Point Trigger Frames for Uplink Power Control
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Solution Overview
Problem
Existing methods for controlling uplink transmission power in wireless local area networks (WLAN) are not sufficiently discussed, leading to reduced accuracy in power control due to irregular AP arrangements and varying performance, especially in Wi-Fi networks compared to cellular communication.
Innovation Solution
A method for improving the accuracy of uplink transmission power control by using a Trigger frame to indicate specific transmission power information to each STA, considering coordinated communication control, allowing for flexible power control based on the capabilities and coverage of each AP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional uplink transmission power control methods are used in WLAN, then the system maintains simplicity in power control implementation, but the accuracy of power control deteriorates due to irregular AP arrangements and varying performance
Solution Approach 1:
The patent segments the power control information by creating separate trigger frames for different APs, each containing specific power control parameters tailored to that AP's characteristics and coverage area. This allows each AP to receive customized power control instructions rather than using a unified approach, thereby improving accuracy while maintaining manageable complexity through structured information organization.
Solution Approach 2:
The patent implements local quality by allowing different APs to have different power control parameters transmitted through dedicated trigger frames. Each AP receives power control information optimized for its specific location, coverage area, and performance characteristics, rather than applying a uniform power control strategy across all APs. This localized approach directly addresses the accuracy issue caused by irregular AP arrangements.
2Measurement precision
If per-AP power control information is transmitted to each STA, then the accuracy of uplink transmission power control improves, but the signaling overhead increases
Solution Approach 1:
The patent merges the power control information transmission into the existing trigger frame structure used for uplink scheduling. By combining power control parameters with scheduling information in a single trigger frame, the system avoids separate signaling for power control, thereby reducing overall signaling overhead while still providing accurate per-AP power control information to each STA.
Solution Approach 2:
The trigger frame structure is designed to serve multiple functions simultaneously: it provides uplink scheduling information, resource allocation details, and power control parameters all in one message. This multi-functionality eliminates the need for separate dedicated power control signaling, reducing the quantity of signaling overhead while maintaining comprehensive power control accuracy.
3Productivity
If coordinated communication control is implemented across multiple APs, then the overall throughput improves, but the complexity of coordination management increases
Solution Approach 1:
The patent implements preliminary action by having APs pre-coordinate and determine optimal power control parameters before actual uplink transmission occurs. The trigger frames containing power control information are prepared in advance based on pre-established coordination agreements between APs, allowing throughput optimization without requiring complex real-time coordination management during active transmission.
Solution Approach 2:
The system incorporates feedback mechanisms where APs monitor uplink transmission quality and adjust power control parameters in subsequent trigger frames. This feedback loop enables continuous optimization of throughput while simplifying coordination management, as APs autonomously adjust parameters based on observed performance rather than requiring complex centralized coordination for every adjustment.
Data Source
AI summary
This access point is provided with a control circuit which, on the basis of transmission power control-related information received from another access point, generates a parameter relating to uplink transmission power control, and a transmission circuit which transmits a control signal that includes said parameter.