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In this paper, we study the setting of carrier-sensing range in 802.11networks under the (cumulative) physical interference model. Specifically, weidentify a carrier-sensing range that will prevent collisions in 802.11networks due to carrier-sensing failure under the physical interference model.We find that the carrier-sensing range required under the physical interferencemodel must be larger than that required under the protocol (pairwise)interference model by a multiplicative factor. For example, if the SINRrequirement is 10dB and the path-loss exponent is 4, the factor is 1.4.Furthermore, given a fixed pathloss exponent of 4, the factor increases as theSINR requirement increases. However, the limit of the factor is 1.84 as theSINR requirement goes to infinity.

Safe Carrier Sensing Range in CSMA Network under Physical Interference Model