WLAN Acknowledgement Frame Adaptive Retransmission
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Solution Overview
Problem
In Wi-Fi networks, data frames are often not correctly received due to poor communication environments or hidden node collisions, leading to inefficient retransmissions using the same Modulation and Coding Scheme (MCS) and transmission power, which can result in high failure probabilities and reduced system throughput.
Innovation Solution
A WLAN communication method that includes generating and sending an acknowledgement message frame with a retransmission flag to indicate whether the data frame should be retransmitted using the same or different MCS and transmission power, allowing for adaptive retransmission strategies based on the reception quality and presence of hidden nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the data frame is retransmitted using the same MCS and transmission power as in the transmission, then the retransmission process is simple, but there may still be a high probability that retransmission of the data frame will fail
Solution Approach 1:
The patent changes the MCS and transmission power parameters during retransmission based on the reception status of the data frame. When a data frame is not correctly received, the receiving device feeds back information indicating that retransmission should use a lower MCS level or different transmission power, thereby adapting parameters to improve retransmission success probability while maintaining manageable complexity
2Reliability
If the data are retransmitted using the adaptive scheme, i.e., the reduced MCS scheme, then the retransmission success probability improves, but spectrum utilization will be low, directly reducing the throughput of the entire system
Solution Approach 1:
The patent implements a dynamic retransmission strategy where the MCS and transmission power are adjusted based on the specific cause of reception failure. Instead of always using reduced MCS, the system adaptively selects transmission parameters: using same MCS when failure is due to hidden node collisions (to maintain throughput) and reduced MCS when failure is due to poor communication environment (to improve success probability), thereby dynamically optimizing both reliability and productivity
Solution Approach 2:
The patent introduces a feedback mechanism where the receiving device sends back information to the transmitting device about the reception status and recommended retransmission parameters. This feedback enables the transmitting device to make informed decisions about whether to use adaptive MCS reduction or maintain original transmission parameters, balancing retransmission success probability with spectrum utilization efficiency
Data Source
AI summary
A communication method includes: receiving a data frame sent by a first wireless device; generating an acknowledgement message frame, the acknowledgement message frame comprising an acknowledgement flag and a retransmission flag, the acknowledgement flag being used for marking whether the data frame is received correctly, and the retransmission flag being used for marking the MCS or transmission power used during the retransmission of the data frame; and sending the acknowledgement message frame to the first wireless device.