Abstract Transmission collisions occur, refereed to as cooperation collisions, in D-TDMA MAC with the introduction of node cooperation in the presence of relative node mobility and channel fading. In this chapter, we present an improvised CAH-MAC with a collision avoidance scheme, referred to as enhanced CAH-MAC (eCAH-MAC) (Bharati et al., Proceedings of IEEE International Conference on Communications (ICC), 2013; Bharati et al., IEEE Trans Veh Technol, to appear). In eCAH-MAC, cooperative relay transmission is suspended if there is (are) any transmission attempt(s) from the one-hop node(s) of the destination and/or helper nodes, avoiding cooperation collision. Cooperative relay transmission is performed only if the destination and helper nodes do not detect transmissions in their one-hop neighborhood. Through mathematical analysis and simulations, we show that the proposed collision avoidance scheme increases the utilization of unreserved time slots by either allowing them to be reserved by nodes seeking their own time slots or using them to perform cooperative relay transmissions, without disrupting the D-TDMA MAC normal operations. Furthermore, through extensive simulations we study the performance of eCAH-MAC in the presence of vehicle mobility over a generalized Nakagami channel.
Enhanced Node Cooperation
2017-07-26
27 pages
Article/Chapter (Book)
Electronic Resource
English
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