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Analysis of Multi-Hop Emergency Message Propagation in Vehicular Ad Hoc Networks

机译:车载Ad Hoc网络中多跳紧急消息传播的分析

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摘要

Vehicular Ad Hoc Networks (VANETs) are attracting the attention of researchers, industry, and governments for their potential of significantly increasing the safety level on the road. In order to understand whether VANETs can actually realize this goal, in this paper we analyze the dynamics of multihop emergency message dissemination in VANETs. Under a probabilistic wireless channel model that accounts for interference, we derive lower bounds on the probability that a car at distance d from the source of the emergency message correctly receives the message within time t. Besides d and t, this probability depends also on 1-hop channel reliability, which we model as a probability value p, and on the message dissemination strategy. Our bounds are derived for an idealized dissemination strategy which ignores interference, and for two provably near-optimal dissemination strategies under protocol interference. The bounds derived in the first part of the paper are used to carefully analyze the tradeoff between the safety level on the road (modeled by parameters d and t), and the value of 1-hop message reliability p. The analysis of this tradeoff discloses several interesting insights that can be very useful in the design of practical emergency message dissemination strategies.
机译:车载自组织网络(VANET)潜在地显着提高道路安全水平的潜力吸引了研究人员,行业和政府的关注。为了了解VANET是否可以真正实现这一目标,本文分析了VANET中多跳紧急消息分发的动态。在考虑了干扰的概率无线信道模型下,我们得出了距离紧急消息源d处的汽车在时间t内正确接收到消息的概率的下界。除了d和t之外,此概率还取决于1跳信道可靠性(我们将其建模为概率值p)以及消息传播策略。我们的界限是针对忽略干扰的理想化传播策略以及在协议干扰下可证明的两种最佳传播策略得出的。本文第一部分得出的边界用于仔细分析道路安全级别(由参数d和t建模)与1-hop消息可靠性p值之间的折衷。这种折衷的分析揭示了一些有趣的见解,这些见解在设计实际的紧急消息传播策略时可能非常有用。

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