An Efficient Cooperative Transmission Based Opportunistic Broadcast Scheme in VANETs

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In vehicular ad hoc networks (VANETs), quick and reliable multi-hop broadcasting is important for the dissemination of emergency warning messages. By scheduling multiple nodes to transmit messages concurrently and cooperatively, cooperative transmission based broadcast schemes may yield much better broadcast performance than conventional broadcast schemes. However, a cooperative transmission requires multiple relays to achieve strict synchronization on both time and frequency, which may induce high cost for a cooperative transmission process. In this paper, we analyze the cost and benefit of a cooperative transmission for data broadcasting in vehicular networks, and introduce a new metric called the single hop broadcast efficiency (SBE) to evaluate the overall broadcast performance. We propose an efficient, non-deterministic cooperation mechanism to reduce the cooperation cost. The mechanism maximizes the expected broadcast performance by selecting cooperators with the largest expected SBE value for a lead relay, and initiates cooperative broadcasting process when the expected SBE value is larger than that of a single-relay based broadcasting. Based on the non-deterministic mechanism, we propose an efficient, cooperative transmission based opportunistic broadcast (ECTOB) scheme which further utilizes rebroadcast to improve the reliability of the broadcast scheme. Simulation results show that the proposed scheme outperforms the conventional ones.
Publisher
IEEE COMPUTER SOC
Issue Date
2023-03
Language
English
Article Type
Article
Citation

IEEE TRANSACTIONS ON MOBILE COMPUTING, v.22, no.3, pp.1327 - 1342

ISSN
1536-1233
DOI
10.1109/TMC.2021.3105982
URI
http://hdl.handle.net/10203/305201
Appears in Collection
EE-Journal Papers(저널논문)
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