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Modifications in IEEE 802.11 to Prevent Collisions due to Interference in MANETs
| International Journal of Computer Applications |
| Foundation of Computer Science (FCS), NY, USA |
| 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, Anoop Srivastava . Modifications in IEEE 802.11 to Prevent Collisions due to Interference in MANETs. International Journal of Computer Applications. 50, 17 ( July 2012), 11-18. DOI=10.5120/7862-1112
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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- Manocha R. K. , Agarwal R. P. , Srivastava A. "A MAC Protocol to prevent collisions due to interference for Ad Hoc Networks" in Global Trends & Innovations in Computer Applications And Informatics – CICON- 2011, held on Sat-Sun, April 9 & 10, 2011, at the Shobhit University Campus, Meerut.
- Manocha R. K. , Agarwal R. P. , Srivastava A. "A MAC Protocol to prevent collisions due to interference for MANETS"; IJCSS, volume 2, Issue 2, Jan-June 2012.
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