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Bayesian networks based reliable broadcast in vehicular networks

机译：基于贝叶斯网络的车载网络中的可靠广播

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Reliability is a key requirement of multi-hop safety message broadcasting. DSRC/802.11p MAC layer has strict reliability requirement for ITS safety applications. In city environment, transmission in wireless medium is vulnerable to packet collisions and interferences. Cross channel interference is quite predominant in the presence of high rise buildings and concurrent transmissions. Achieving high reliability (e.g., 0.99) in the presence of all kinds of communication vulnerabilities is a major challenge in urban environments. To the best of our knowledge, none of the existing emergency message dissemination schemes, in the literature, achieves high reliability in lossy channel. In this paper, we propose a novel scheme that achieves high reliability for message dissemination while satisfying delay requirements, for various channel conditions. This paper proposes a new broadcast scheme, called Bayesian networks and unipolar orthogonal Code based Reliable multi-hop Broadcast (BCRB) to address this issue. Our objective is to guarantee strict reliability requirement (e.g., 99%) in each hop using broadcast repetitions. We propose an approach, based on using Bayesian networks, that exploits periodic beacons to accurately infer 802.11p link reception quality at each hop. Using this information, a sender determines an optimal number of repetitions, multiple forwarders and their positions. To combat interference, during broadcast repetitions, BCRB uses Uni-Polar Orthogonal Codes (UPOC). For multi-hop transmissions, multiple forwarders cooperatively communicate at each hop with the objective to achieve high broadcast reliability in next hop. Simulation results show that BCRB achieves very high reliability. Furthermore, BCRB satisfies delay requirements for time-sensitive vehicular applications with relatively low overhead. BCRB achieves 35-40% improvement in comparison to existing schemes. (C) 2019 Elsevier Inc. All rights reserved.
机译：可靠性是多跳安全消息广播的关键要求。 DSRC / 802.11p MAC层对ITS安全应用具有严格的可靠性要求。在城市环境中，无线介质中的传输容易受到数据包冲突和干扰。在高层建筑和同时传输的情况下，跨信道干扰非常主要。在存在各种通信漏洞的情况下实现高可靠性（例如0.99）是城市环境中的主要挑战。据我们所知，现有的紧急消息传播方案在文献中都没有在有损信道中实现高可靠性。在本文中，我们提出了一种新颖的方案，该方案针对各种信道条件，在满足延迟要求的同时，实现了消息分发的高可靠性。本文提出了一种新的广播方案，称为贝叶斯网络和基于单极性正交码的可靠多跳广播（BCRB），以解决此问题。我们的目标是使用广播重复来确保每跳中严格的可靠性要求（例如99％）。我们提出一种基于贝叶斯网络的方法，该方法利用周期性信标来准确推断每个跃点处的802.11p链路接收质量。使用此信息，发送者可以确定最佳的重复次数，多个转发者及其位置。为了抵抗干扰，在广播重复期间，BCRB使用单极性正交码（UPOC）。对于多跳传输，多个转发器在每个跳上进行协作通信，目的是在下一跳中实现较高的广播可靠性。仿真结果表明，BCRB具有很高的可靠性。此外，BCRB以相对较低的开销满足了对时间敏感的车辆应用的延迟要求。与现有方案相比，BCRB实现了35-40％的改进。 （C）2019 Elsevier Inc.保留所有权利。

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