Abstract
Cooperative communication is an effective method of improving the transmission performance for vehicular ad hoc networks. However, the rapid movement of vehicles leads to frequent changes in network topology and reduces the probability of successful data transmission on the medium access control (MAC) layer. In this paper, we propose an Optimal Cooperative Ad hoc MAC protocol (OCA-MAC) based on time division multiple access (TDMA). OCA-MAC utilizes multiple cooperative nodes to forward data, so as to improve the probability of successful data transmission. It chooses cooperative nodes according to direct successful transmission probability, communication range between potential helper node and destination node, and available time slot. Meanwhile, in order to avoid excessive transmission redundancy caused by multiple cooperative forwarding, the optimal number of cooperative forwarding nodes is obtained through analysis of a probabilistic model. Simulation results show that OCA-MAC improves the successful data transmission rate and reduces the number of transmission times and transmission delay compared to the multichannel TDMA MAC protocol (VeMAC) and the cooperative ad hoc MAC protocol (CAH-MAC).
Highlights
A growing number of new applications, such as traffic accidents warning, assistant driving, special information query, multimedia information dissemination, and data collecting for smart cities, are emerging in the vehicular ad hoc networks (VANETs) [1,2,3,4]
We propose an Optimal Cooperative Ad hoc medium access control (MAC) protocol, called OCA-MAC, based on time division multiple access (TDMA) for VANETs
We propose a TDMA-based MAC protocol to improve the successful transmission rate for VANETs, which uses cooperative nodes to forward data; We established an effective probabilistic model for cooperative communication and obtain the optimal value of the number of cooperative nodes under different channel; We present extensive simulation results to verify the throughput of the proposed protocol and show that the proposed protocol can achieve a successful transmission rate and reduce the number of transmissions and transmission time compared to the multichannel TDMA MAC protocol (VeMAC) and the cooperative ad hoc MAC protocol (CAH-MAC)
Summary
A growing number of new applications, such as traffic accidents warning, assistant driving, special information query, multimedia information dissemination, and data collecting for smart cities, are emerging in the vehicular ad hoc networks (VANETs) [1,2,3,4]. We propose an Optimal Cooperative Ad hoc MAC protocol, called OCA-MAC, based on TDMA for VANETs. We designed the method of choosing the optimal cooperative node and improved the successful transmission rate. We propose a TDMA-based MAC protocol to improve the successful transmission rate for VANETs, which uses cooperative nodes to forward data; We established an effective probabilistic model for cooperative communication and obtain the optimal value of the number of cooperative nodes under different channel; We present extensive simulation results to verify the throughput of the proposed protocol and show that the proposed protocol can achieve a successful transmission rate and reduce the number of transmissions and transmission time compared to the multichannel TDMA MAC protocol (VeMAC) and the cooperative ad hoc MAC protocol (CAH-MAC).
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