Wireless LAN Interference Detection Without Rate Fallback
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Solution Overview
Problem
Conventional jamming avoidance methods in wireless communication systems often result in increased packet length due to transmission rate fallback, making communication vulnerable to interference, and fail to effectively avoid interference, especially when interference occurs in burst-like or asynchronous patterns.
Innovation Solution
A wireless communication apparatus with a configuration that includes a communication status deciding section, packet error detecting section, and interference error deciding section, which stops fallback control and fixes the transmission rate when interference is detected, increasing the number of retransmissions to avoid interference and ensure reliable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fallback control is performed to reduce transmission rate when communication error occurs, then transmission reliability is improved, but packet length increases making communication more vulnerable to interference
Solution Approach 1:
The system dynamically switches between two different error handling modes: a first error handling mode for general communication errors that performs fallback control, and a second error handling mode for interference errors that increases retransmission attempts without reducing transmission rate. This dynamic adaptation resolves the contradiction by selecting the appropriate strategy based on error type detection.
Solution Approach 2:
The invention changes the parameters of error handling based on the detected error type. When interference errors are detected (characterized by high bit error rates), the system modifies the retransmission parameters by increasing the maximum number of retransmission attempts and disabling rate fallback, thereby maintaining packet length while improving reliability against interference.
2Productivity
If the number of retransmissions is limited, then communication efficiency is maintained, but interference avoidance capability is insufficient
Solution Approach 1:
The system dynamically adjusts the number of retransmission attempts based on the detected error type. For interference errors, the maximum retransmission count is increased to allow more attempts to overcome intermittent interference, while for general errors, the standard limited retransmission policy is maintained to preserve communication efficiency.
Solution Approach 2:
The invention changes the retransmission parameter values based on error type detection. When interference errors are identified, the system increases the retransmission counter limit and modifies the backoff parameters, allowing more retransmission attempts without triggering rate fallback, thereby improving interference avoidance while maintaining efficiency for non-interference errors.
3Reliability
If transmission rate is reduced through fallback, then error correction capability is improved, but packet transmission time increases exposing communication to longer interference periods
Solution Approach 1:
The system dynamically determines whether to apply rate fallback based on the detected error type. For interference errors characterized by high bit error rates, the system disables rate fallback and instead increases retransmission attempts, thereby keeping packet transmission time short. For general errors, the traditional rate fallback mechanism is applied to improve error correction capability.
Solution Approach 2:
The invention changes the rate control parameters based on error type detection. When interference errors are detected, the system modifies the rate control algorithm to prevent rate reduction and maintains the original transmission rate, thereby minimizing packet transmission time and exposure to interference periods.
Data Source
AI summary
A wireless communication apparatus, a wireless LAN system, an interference detecting method, and an interference avoidance method which detect the occurrence of a communication error caused by the occurrence of interference. A wireless communication apparatus (100) comprises a transmitted packet interference error detecting circuit (120) composed of an ED value detecting circuit (105) for measuring the ED value prior to packet transmission, an Ack error detecting circuit (106) for detecting an Ack error in the transmitted packet, and a transmitted packet interference error determining circuit (107). When the Ack error is detected in a packet transmitted on condition that the measured ED value exceeds the threshold value of interference determination, the apparatus (100) determines it to be an interference error.