Link-Layer Cooperative Communication in Vehicular Networks by Sailesh Bharati & Weihua Zhuang

Author:Sailesh Bharati & Weihua Zhuang
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

Figures 4.12, 4.13 and 4.14 show packet dropping rate for CAH-MAC and ADHOC MAC in various networking conditions. It is observed that, for a given channel conditions, the packet dropping rate of CAH-MAC is less than that of ADHOC MAC. However, the gap between the packet dropping rate increases as the channel condition improves in a similar networking condition, i.e., the same p coop value. Hence, the gap is higher when R = 200 m than that when R = 300 m. For the same channel condition, the larger the M max value, the larger the gap between the packet dropping rate of two protocols. This is due to the fact that, upon a transmission failure, in CAH-MAC, the helper node retransmits a packet in an unreserved time slot. Hence, with a larger M max , a node in CAH-MAC gets more chances to retransmit a packet than that in ADHOC MAC and with a low M max value. The increase in retransmission limit increases the probability of successful packet delivery to the destination node, preventing a packet from being dropped from the buffer memory.

Fig. 4.12Packet dropping rate of ADHOC MAC and CAH-MAC with M max = 1 frame, ρ l = 30 vehicle per kilometer and F = 60 time slots [1]

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