Abstract
In vehicular ad hoc networks (VANETs), many schemes for a multi-channel media access control (MAC) protocol have been proposed to adapt to dynamically changing vehicle traffic conditions and deliver both safety and non-safety packets. One such scheme is to employ both time-division multiple access (TDMA) and carrier-sense multiple access (CSMA) schemes (called a hybrid TDMA/CSMA scheme) in the control channel (CCH) interval. The scheme can adjust the length of the TDMA period depending on traffic conditions. In this paper, we propose a modified packet transmitted in the TDMA period to reduce transmission overhead under a hybrid TDMA/CSMA multi-channel MAC protocol. Simulation results show that a MAC protocol with a modified packet supports an efficient packet delivery ratio of control packets in the CCH. In addition, we analyze the hybrid TDMA/CSMA multi-channel MAC protocol with the modified packet under saturated throughput conditions on the service channels (SCHs). The analysis results show that the number of neighbors has little effect on the establishment of the number of time slots in TDMA periods and on SCHs under saturated throughput conditions.
Highlights
According to the World Health Organization, 100 million people die in traffic accidents worldwide annually, accounting for economic losses of $500 billion [1]
We propose a modified announcement packet to reduce payload size of a packet transmitted in the time-division multiple access (TDMA) period
We present the modified announcement packet to reduce payload size of a packet transmitted in the TDMA period
Summary
According to the World Health Organization, 100 million people die in traffic accidents worldwide annually, accounting for economic losses of $500 billion [1]. Unlike contention-based MAC protocols, contention-free MAC protocols allow each vehicle to access a channel by following a schedule of time slot frequency bands or code sequences [9] To do so, they require a strict synchronized scheme between vehicles. To enhance QoS requirements and reduce the number of packet collisions, hybrid MAC protocols were proposed to try to combine these two mechanisms into a single architecture Such an architecture includes two periods on the access channel: a random access period and a contention-free access period. The multi-channel MAC protocol supports reliable transmission packets with low latency and provides maximum throughput for non-safety applications.
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