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In High Density (HD) IEEE 802.11 WLAN, packet loss can occur due to co-channel interference (asynchronous interference) or collisions (synchronous interference). In order to effectively mitigate the interference for spatial reuse, the causes of packet loss should be differentiated and corresponding network parameters (Physical Carrier Sensing (PCS) Threshold, Transmit Power (TXPW) and contention windows size) tuned accordingly. Such loss differentiation ability is not supported by current IEEE 802.11 networks; the authors devised a novel, zero over-the-air overhead, robust yet accurate method of estimating the probability of collision and interference, respectively. In this paper, they investigate how to use differentiated Packet Error Rate (PER) to mitigate asynchronous interference for increasing spatial reuse.
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