Mitigating Broadcast Storm Problem in VANET when Parked Cars being awaken as Relays

A. Qiu, Donglin Wang, S. Partani, R. Sattiraju, H. Schotten
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引用次数: 5

Abstract

In the urban environment, buildings, moving obstacles usually attenuate signals of safety messages, so that the connectivity and the reliability are reduced, which is known as Obstacle Shadowing problem. A typical solution to address this problem is to deploy Road-Side Units (RSUs), making them relay the Basic Safety Message (BSM) from driving vehicles. However, due to the high cost of deploying RSUs, the large numbers of parked cars in urban areas can be temporally used as RSUs for the financial aspect. Unfortunately, the conventional IEEE 802.11p protocol suffers from a so-called Broadcast Storm problem, where a high rate of contentions and packet collisions occur. In this paper, we show how even a small number of parked cars as relay could cause over 65% loss in Packet Reception Ratio (PRR). Therefore, some broadcast mechanisms are proposed to solve this problem. However, in this paper, we show the limitations of the conventional schemes, and we proposed revised and new schemes for selecting parked cars as relays/RSUs according to their geographic information and the surrounding traffic condition. The benefits are the great reduction in the deployment of RSUs, and significant improvement in the connectivity (up to 60%) and the reliability (up to 70%).
缓解VANET中停车被唤醒为中继时的广播风暴问题
在城市环境中,建筑物、移动障碍物通常会使安全信息信号衰减,从而降低系统的连通性和可靠性,这就是障碍物阴影问题。解决这个问题的一个典型解决方案是部署路侧单元(rsu),让它们从驾驶车辆中传递基本安全信息(BSM)。然而,由于部署备用单元的成本较高,从财务方面考虑,城市地区大量停放的汽车可以暂时用作备用单元。不幸的是,传统的IEEE 802.11p协议存在所谓的广播风暴问题,即发生高比率的争用和分组冲突。在本文中,我们展示了即使少量停放的汽车作为中继也可能导致超过65%的包接收比损失(PRR)。因此,提出了一些广播机制来解决这个问题。然而,本文指出了传统方案的局限性,并根据停放车辆的地理信息和周围的交通状况,提出了选择停放车辆作为继电器/ rsu的改进方案和新方案。这样做的好处是大大减少了rsu的部署,并显著提高了连接性(高达60%)和可靠性(高达70%)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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