Wireless Terminal CCA Threshold and Power Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The IEEE 802.11 standards lack a method for optimizing wireless LAN parameters such as frequency band selection and channel allocation, leading to inefficient operation and throughput degradation in dense environments due to decentralized autonomous parameter setting by wireless stations, resulting in inadequate frequency allocation and increased interference.
Innovation Solution
A wireless communication system where wireless terminal stations report environmental information to a control device, which calculates and sets optimal transmission power values and carrier sense thresholds, allowing centralized optimization of these parameters to enhance system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If decentralized autonomous parameter setting is used by wireless stations, then device complexity and ease of operation are improved, but system throughput and interference control deteriorate in dense environments
Solution Approach 1:
A control device is introduced as an intermediary between wireless stations and the parameter optimization process. The control device collects environmental information from multiple stations, calculates optimal transmission power values and CCA thresholds, and distributes these parameters back to the stations. This mediator approach resolves the contradiction by maintaining autonomous operation at the station level while achieving centralized optimization for improved system throughput and reduced interference in dense environments
2Quantity of substance
If more wireless stations transmit on shared frequency bands, then network coverage and service capacity are improved, but interference increases and throughput decreases
Solution Approach 1:
The invention dynamically adjusts key transmission parameters including transmission power values and CCA thresholds based on environmental information collected from the network. By changing these parameters according to the number of active stations and interference conditions, the system can accommodate more wireless stations on shared frequency bands while maintaining acceptable interference levels and throughput performance
3Area of stationary object
If transmission power is increased to improve coverage area, then coverage and signal strength are improved, but interference to other stations increases
Solution Approach 1:
The control device calculates and assigns different transmission power values to individual wireless stations based on their specific environmental conditions, locations, and interference situations. This localized parameter optimization allows each station to achieve adequate coverage area while minimizing interference to neighboring stations, rather than using a uniform high power setting for all stations
4Object-generated harmful factors
If CCA threshold is lowered to reduce interference, then interference control is improved, but transmission opportunities decrease and throughput is reduced
Solution Approach 1:
The CCA threshold is transformed from a static parameter into a dynamic one that is adjusted based on real-time environmental information collected from the network. The control device optimizes CCA thresholds according to the current number of active stations, interference levels, and traffic conditions, allowing the system to achieve good interference control when needed while maintaining sufficient transmission opportunities under different network conditions
Data Source
AI summary
In a wireless communication system wherein wireless terminal stations, each belonging to one of a plurality of wireless base stations, transmit on a shared frequency band, each of the wireless terminal stations includes means for notifying a control device of environmental information that indicates a communication status of the wireless terminal station itself via a wireless base station to which the wireless terminal station belongs, and for setting a transmission power value and a CCA threshold notified by the control device, and the control device includes means for calculating the transmission power value and the carrier sense threshold according to a predetermined control procedure based on the environmental information collected from the wireless terminal station via the wireless base station, and for notifying the wireless terminal station of the transmission power value and the carrier sense threshold via the wireless base station.