WLAN Data Rate Adaptation Using Stable Rate Recovery
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Solution Overview
Problem
Conventional data rate adaptation methods in WLANs take a long time to recover to optimal transmission rates after interference disappears, leading to inefficient resource consumption and reduced throughput in stable network environments.
Innovation Solution
A data rate adaptation method that directly adjusts the transmission rate to a previously stable rate after interference clearance, using a 'stable rate' definition based on continuous packet transmission and total transmission time, and incorporating a table to record and select previous stable rates for rapid recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional data rate adaptation methods (ARF, Onoe) are used to dynamically adjust transmission rates, then the system can adapt to changing channel conditions, but the recovery time to optimal rates after interference disappears becomes excessively long
Solution Approach 1:
The patent stores the last stable data rate in advance before interference occurs. When interference disappears and packet transmission succeeds continuously for a predetermined time, the system directly switches back to the pre-stored stable rate, avoiding the need to gradually retry higher rates. This preliminary action of saving the optimal rate enables rapid recovery.
Solution Approach 2:
The patent implements a feedback mechanism that monitors packet transmission success/failure continuously. When packet transmission succeeds for a predetermined time, the system determines that interference has disappeared and triggers the rate recovery process. This feedback loop enables the system to respond dynamically to channel condition changes.
2Productivity
If conventional algorithms repeatedly retry higher transmission rates after interference, then the system attempts to find optimal rates, but this causes excessive retransmissions and reduces throughput
Solution Approach 1:
By pre-storing the last stable data rate before interference occurs, the system avoids the energy-consuming process of repeatedly retrying higher rates. The stored rate is directly applied when interference disappears, eliminating unnecessary retransmissions and associated energy waste.
Solution Approach 2:
The patent uses a simple predetermined-time counter mechanism rather than complex continuous adaptation algorithms. This lightweight approach avoids the computational overhead and retransmission storms of conventional methods, providing an energy-efficient solution for rate recovery.
3Device complexity
If the system uses fixed-rate transmission without adaptation, then implementation is simple, but the system cannot recover efficiently from interference in stable channel conditions
Solution Approach 1:
The system performs a simple preliminary action of storing the last stable rate when interference occurs. This minimal additional complexity enables rapid recovery by directly switching back to the stored rate, rather than implementing complex continuous adaptation or fixing the rate permanently.
Solution Approach 2:
The patent implements dynamic rate adjustment with a simple mechanism: store the stable rate during interference, then switch back to it when interference disappears (detected by continuous successful transmissions). This dynamic behavior reduces transient time without requiring complex adaptive algorithms.
Data Source
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AI summary
A method of communication between a transmitter and a receiver over a channel is provided. The transmitter is capable of transmitting packets with multiple data rates, each of which adapts to a respective channel condition with regards to the performance of the communication. The method comprises the steps of, at the level of the transmitter: upon detection of a disappearance of deterioration of the channel condition, transmitting packets with a data rate selected from a group of stable data rates that are stably used before the disappearance of the deterioration but larger than the last data rate before disappearance of the deterioration.