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

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International Journal of Computer Applications
© 2012 by IJCA Journal
Volume 50 - Number 17
Year of Publication: 2012
Authors:
R. K. Manocha
R. P. Agarwal
Anoop Srivastava
10.5120/7862-1112

R K Manocha, R P Agarwal and Anoop Srivastava. Article: Modifications in IEEE 802.11 to Prevent Collisions due to Interference in MANETs. International Journal of Computer Applications 50(17):11-18, July 2012. Full text available. BibTeX

@article{key:article,
	author = {R. K. Manocha and R. P. Agarwal and Anoop Srivastava},
	title = {Article: Modifications in IEEE 802.11 to Prevent Collisions due to Interference in MANETs},
	journal = {International Journal of Computer Applications},
	year = {2012},
	volume = {50},
	number = {17},
	pages = {11-18},
	month = {July},
	note = {Full text available}
}

Abstract

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 'safe-distance' begins or ends its transmission. Thus, if any node observes a sudden increase in its received signal by more than 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 ? ?, collisions due to interference can be completely prevented. It also brings out the situations where interference might exceed 1/?-N; however, the probability of interference exceeding 1/?-N lies between 0 and 0. 1577*10-5.

References

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