WSEAS Transactions on Communications
Print ISSN: 1109-2742, E-ISSN: 2224-2864
Volume 14, 2015
Performance Approximation of Persistent Relay CSMA with Carry-Over of Backoff Counter Freezing After Collision
Authors: , ,
Abstract: Cooperative transmission with one or more relay nodes has been investigated. We propose incorporation of the carry-over of backoff counter freezing after collision to Persistent Relay Carrier Sense Multiple Access (PRCSMA), in which two or more relay nodes cooperatively support retransmission of frame originated from source node over a common channel. The performance of the proposed protocol is approximately analyzed by means of a Markovian model. The accuracy of the approximation is verified by compute simulations. By carrying over the backoff counter freezing, that is, by deferring the backoff counter decrement, the priority of frame transmission in the next time slot is given to only nodes involved in frame collision. Therefore, the possibility of consecutive collision can be mitigated. Numerical results reveal that the proposed protocol can greatly improve the performance of the original PRCSMA. By carrying over the backoff counter freezing, the possibility of consecutive frame collisions can be reduced. This successfully leads to avoidance of a catastrophic series of frame collisions and considerable reduction of cooperation phase.
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Keywords: Persistent relay CSMA, Cooperative retransmission control, IEEE 802.11 DCF, Markovian model
Pages: 1-10
WSEAS Transactions on Communications, ISSN / E-ISSN: 1109-2742 / 2224-2864, Volume 14, 2015, Art. #1