Transmitting Power Control for Wireless Multiplexing Interference
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Solution Overview
Problem
In wireless local area networks (WLANs), the inequality of transmitting powers between stations causes interference during multiplexing transmission, leading to asymmetry in coverage areas and communication disruptions.
Innovation Solution
A method where a sender estimates signal attenuation to determine its transmitting power, ensuring it does not exceed the acceptable interference threshold of the receiver, thereby minimizing interference and maintaining communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiplexing transmission is used to increase channel access opportunities, then network throughput is improved, but interference between transmissions increases due to inequality of transmitting powers
Solution Approach 1:
The patent changes the transmitting power parameter dynamically based on the received power of the first frame. The second transmitter adjusts its transmitting power for the second frame according to the measured received power of the first frame, ensuring that the total received power at the second receiver remains within acceptable limits. This parameter adjustment resolves the contradiction by allowing multiplexing transmission while controlling interference through adaptive power control.
2Reliability
If a station transmits with higher power to improve its own communication reliability, then its communication quality is improved, but it causes serious interference to other simultaneous transmissions
Solution Approach 1:
The patent implements a feedback mechanism where the second transmitter measures the received power of the first frame and uses this information to adjust its own transmitting power for the second frame. This feedback loop ensures that the second transmitter can maintain reliable communication while preventing excessive interference to the first transmission, as the power adjustment is based on actual received power measurements.
Solution Approach 2:
The transmitting power parameter is dynamically adjusted based on the received power of the first frame. By changing the power parameter adaptively rather than using fixed high power, the system maintains communication reliability for the second transmission while limiting the harmful interference generated, thus resolving the contradiction between reliability and interference.
Data Source
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AI summary
A method and apparatus for transmitting data are provided. The method includes: when detecting that there is a wireless frame currently being transmitted on a working channel, the first sender estimates a signal attenuation between the first sender and a first receiver for the wireless frame currently being transmitted to obtain an estimation result, and determines a transmitting power of the first sender according to the estimation result; and the first sender sends a wireless frame to a second receiver with the determined transmitting power. Through the above scheme, the first sender determines the transmitting power of the first sender according to the estimation result, decreasing interference caused by inequality of transmitting powers during multiplexing transmission.