Physical Layer Transmission Rate Control via MPDU Retransmission Feedback
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Solution Overview
Problem
In IEEE 802.11 wireless local area network environments, existing methods for determining the physical layer transmission rate are inefficient, leading to continuous rate decreases in noisy channels, increased packet retransmissions, and potential communication interruptions due to indirect estimation of channel conditions and inability to ensure throughput rates.
Innovation Solution
A method and apparatus that adaptively adjust the physical layer protocol data unit (PPDU) transmission rate based on media access control protocol data unit (MPDU) retransmission frequency, using frequency and rate thresholds to increase or decrease the transmission rate in response to channel noise levels, thereby optimizing throughput in real-time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the physical layer transmission rate is determined based on packet retransmission rate or packet transmission error rate, then the transmission rate can be adjusted according to channel conditions, but the detection is slow and the physical layer rate may decrease continuously in noisy channels leading to zero throughput
Solution Approach 1:
The patent implements a feedback mechanism where the physical layer transmission rate is adjusted based on real-time detection of channel noise levels and packet retransmission rates. The system continuously monitors channel conditions and adjusts the transmission rate accordingly, creating a closed-loop control system that prevents continuous rate decreases and ensures stable throughput in noisy channels.
Solution Approach 2:
The patent introduces dynamic adjustment of the physical layer transmission rate based on real-time channel conditions. Instead of using fixed rate determination methods, the system dynamically adapts the transmission rate according to detected noise levels and retransmission statistics, enabling the system to respond flexibly to changing channel conditions and avoid getting stuck in continuous rate degradation.
2Reliability
If the physical layer rate is decreased to handle noisy channels, then packet retransmission rate may increase, but this leads to continuous rate decrease and communication interruption
Solution Approach 1:
The patent changes the parameter used for transmission rate determination from indirect packet error rates to direct physical layer noise level detection. By monitoring actual noise levels and using this information to adjust transmission rates, the system can maintain higher throughput while handling noisy channels, preventing the continuous rate decrease that occurs with traditional methods.
Solution Approach 2:
The system implements feedback control by continuously monitoring packet retransmission rates and channel noise levels, then adjusting the physical layer transmission rate accordingly. This feedback mechanism prevents the runaway effect where rate decreases lead to increased retransmissions, which would otherwise cause continuous degradation and communication failure.
3Device complexity
If indirect estimation methods are used to determine channel noise levels, then the system can operate with simpler detection mechanisms, but the estimation is inaccurate and cannot reflect actual physical transmission performance
Solution Approach 1:
The patent introduces an intermediary detection mechanism that directly measures physical layer noise levels rather than relying on indirect packet error rate estimations. This intermediary approach provides accurate real-time noise level information that directly reflects actual channel conditions, enabling precise transmission rate adjustment without requiring complex detection systems.
Data Source
AI summary
Method and apparatus for controlling a physical layer protocol data unit (PPDU) transmission rate of a physical layer in a first terminal are provided. The method includes: obtaining a media access control protocol data unit (MPDU) retransmission frequency of the first terminal in a first period, where the first terminal is a station or an access point in a wireless network; if the MPDU retransmission frequency is less than a frequency threshold, promoting the PPDU transmission rate in a second period; and else, suppressing the PPDU transmission rate in the second period, where the second period is following and adjacent to the first period along a time axis. The PPDU transmission rate may be adjusted adaptively according to a channel's practical transmission state, the physical layer rate may be prevented from decreasing continuously in noisy channel environment, and a throughput rate may be improved in real time.