Safe Carrier Sensing Range in CSMA Network under Physical Interference Model

Details Safe Carrier Sensing Range in CSMA Network under Physical Interference Model Safe Carrier Sensing Range in CSMA Network under Physical Interference Model

2009-01-23

arxiv.org/abs/0901.3611v1

Computer Science

Networking and Internet Architecture

5 pages

Scientific paper

In this paper, we study the setting of carrier-sensing range in 802.11 networks under the (cumulative) physical interference model. Specifically, we identify a carrier-sensing range that will prevent collisions in 802.11 networks due to carrier-sensing failure under the physical interference model. We find that the carrier-sensing range required under the physical interference model must be larger than that required under the protocol (pairwise) interference model by a multiplicative factor. For example, if the SINR requirement 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 the SINR requirement increases. However, the limit of the factor is 1.84 as the SINR requirement goes to infinity.

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