Wireless Network Interference Reduction via Adaptive CCA and Power Control
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Solution Overview
Problem
High density wireless communication networks face reduced network capacity due to co-channel interference and hidden terminal scenarios, where existing Clear Channel Assessment (CCA) methods are ineffective in mitigating interference arriving simultaneously with or after the signal.
Innovation Solution
Adapting the transmission power and CCA threshold based on measured packet error rates, with specific thresholds for CCA adaptation and transmission power adjustment to minimize packet losses from interference arriving before or after the signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CCA sensitivity is increased to reduce collisions, then packet error rate decreases, but network capacity decreases due to excessive deferrals from exposed terminals
Solution Approach 1:
The CCA threshold is made dynamic rather than fixed, allowing it to adapt to different network conditions. The system adjusts the CCA threshold based on measured packet error rates and collision patterns, enabling the network to optimize between reliability and capacity based on current interference conditions and network load.
Solution Approach 2:
The invention changes the CCA threshold parameter adaptively based on network conditions. By monitoring packet error rates and adjusting the threshold accordingly, the system can reduce the threshold to allow more transmissions (increasing capacity) when conditions permit, or increase it to reduce false deferrals (improving reliability) when interference is high.
2Productivity
If CCA threshold is reduced to allow more transmissions, then network capacity increases, but collision rate increases
Solution Approach 1:
The system implements feedback mechanisms where packet error rates are measured and used to adjust the CCA threshold. This closed-loop control allows the network to learn from past performance and adapt the threshold to minimize collisions while maintaining capacity, using feedback from actual transmission outcomes to guide future decisions.
Solution Approach 2:
The system performs preliminary measurements of packet error rates and network conditions before making threshold adjustments. By gathering data on current interference levels and transmission success rates in advance, the system can make informed decisions about threshold changes that balance capacity and collision rates.
3Object-affected harmful factors
If traditional CCA methods are used to detect interference, then interference arriving before the signal is detected, but interference arriving simultaneously with or after the signal cannot be mitigated
Solution Approach 1:
The system enhances the CCA mechanism to handle multiple interference scenarios universally. By combining traditional energy detection with packet error rate analysis and adaptive threshold adjustment, the system can address interference arriving before, simultaneously with, or after the signal, making the interference mitigation approach versatile across different hidden terminal scenarios.
Solution Approach 2:
The invention introduces packet error rate measurements as an intermediary indicator of interference conditions. Rather than relying solely on direct energy detection at the CCA moment, the system uses PER measurements as a mediator to infer the presence and impact of interference, enabling indirect detection of interference scenarios that traditional CCA cannot detect.
Data Source
AI summary
A system and method of reducing interference in a wireless communication network is disclosed. The method comprises adapting a transmission power of a signal of a wireless communication device when a clear channel assessment threshold equals a predetermined limit and a packet error rate exceeds a predetermined packet error rate threshold. In particular, the method includes increasing the transmission power of the signal when the clear channel assessment threshold equals a lower limit and the packet error rate exceeds an upper packet error rate threshold and decreasing the transmission power of the signal when the clear channel assessment threshold equals an upper limit and the packet error rate falls below a lower packet error rate threshold.