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The VeMAC Protocol

As discussed in Sect. 2.1, the vehicles and RSUs broadcast periodic and event-driven safety messages on the CCH for the purpose of safety applications, and the periodic safety messages broadcast by different vehicles have the same (fixed) message size. As shown in Fig. 3.1, at each node, the periodic and event-driven safety messages are mapped to two different queues, which are served independently by the VeMAC protocol, as described in details in Sect. 3.2. [Pg.26]

Based on a given transmission rate determined by the physical layer, the VeMAC maximum transmission unit (MTU) is defined as the maximum amount of data (without the physical layer overhead) which can be transmitted in the duration of one time slot. The duration of a time slot, t, is chosen such that the MTU is equal to the size of a periodic safety message broadcast by a vehicle plus the maximum size of control information introduced by the VeMAC protocol. For RSUs, if the size of a periodic safety message plus the VeMAC control information exceeds the MTU, the message is fragmented to be transmitted as multiple VeMAC packets, as indicated in... [Pg.26]

Two versions of the VeMAC protocol are considered VeMAC with t = 0 (VO) and VeMAC with t = oo (V-inf). As will be shown in Sect. 3.5.4, both versions of the VeMAC protocol significantly outperform the ADHOC MAC protocol in [4]. The... [Pg.41]

A website [11] is created in order to upload the ns-2 implementation of the VeMAC protocol, including the periodic and event-driven message queues, for interested researchers. [Pg.62]

This chapter presents a detailed delivery delay analysis for VANET safety messages broadcast on the CCH, based on the VeMAC protocol described in Chap. 3. Both queueing and service delays of periodic and event-driven safety messages are analyzed, by taking into consideration the size and the arrival pattern of each type of... [Pg.69]

Fig. 4.9 Simulation results for the city scenario total delay and fairness indicators of the VeMAC protocol [1]. a Average total delay for VeMAC. b Periodic fairness indicator for VeMAC. c Event-driven fairness indicator for VeMAC... Fig. 4.9 Simulation results for the city scenario total delay and fairness indicators of the VeMAC protocol [1]. a Average total delay for VeMAC. b Periodic fairness indicator for VeMAC. c Event-driven fairness indicator for VeMAC...
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