Modifications in IEEE 802. 11 to Prevent Collisions due to Interference in MANETs

R. K.Manocha, R. P. Agarwal, Anoop Srivastava
2012 International Journal of Computer Applications  
Collisions due to interference signal are frequent in multi-hop wireless networks. Interference signal can be reduced below a threshold level if all parallel transmitter-receiver pairs maintain a minimum of "safe-distance" between them. A node observes a "significant" sudden increase or decrease in its received signal whenever another node within its "safedistance" begins or ends its transmission. Thus, if any node observes a sudden increase in its received signal by more than the "significant"
more » ... n the "significant" value, it infers that another node within its "safe-distance" has begun its transmission. Similarly, when any node observes a sudden decrease in its received signal by more than the "significant" value, it infers that another node within its "safe-distance" has completed its transmission. In this paper we propose a protocol where a node begins its transmission only if it has a minimum of "safe-distance" from the nearest parallel transmitter-receiver pair, and compute the values of "safe-distance" and the "significant" change in received signal. We then propose modifications in IEEE 802.11 protocol such that every node ensures a minimum of "safe-distance" from the nearest transmitter-receiver pair before it begins its transmission. Analysis shows that when all receivers in the network have a Signal to Interference & Noise Ratio SINR ≥ β, collisions due to interference can be completely prevented. It also brings out the situations where interference might exceed 1/β-N; however, the probability of interference exceeding 1/β-N lies between 0 and 0.1577*10 -5 . General Terms Wireless multi-hop networks, Ad hoc networks. Keywords Keywords are your own designated keywords which can be used for easy location of the manuscript using any search engines.
doi:10.5120/7862-1112 fatcat:djau2ey7xnc6dbb7pogk5zfbta