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An effective back-off selection technique for reliable beacon reception in VANETs

机译：VANET中可靠信标接收的有效退避选择技术

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摘要

In safety-critical scenarios, reliable reception of beacons transmitted by a subject vehicle is critical to avoid vehicle collision. According to the employed contention window sizes in IEEE 802.11p, beacons are transmitted with a small contention window size. As a result, multiple vehicles contend for the shared channel access by selecting the same back-off slot. This is a perfect recipe for synchronous collisions wherein reliable beacon delivery cannot be guaranteed for any vehicle. We consider the problem of selecting the back-off slots from the current contention window to provide reliable delivery of beacons transmitted by a subject vehicle to its neighbors. Given a safety scenario, we propose a Pseudo-Random Number Generator (PRNG)-inspired back-off selection (PBS) technique. The proposed technique works on the hypothesis that synchronous collisions of beacons transmitted by a subject vehicle can be reduced if all its neighbors select different back-off slots (ie, not the back-off slot selected by the subject vehicle). The discrete-event simulations demonstrate that PBS can increase the overall message reception from a subject vehicle, in comparison with the uniform random probability back-off selection in IEEE 802.11p.
机译：在对安全至关重要的情况下，可靠接收目标车辆发送的信标对于避免车辆碰撞至关重要。根据IEEE 802.11p中采用的竞争窗口大小，以较小的竞争窗口大小发送信标。结果，多个车辆通过选择相同的退避时隙来竞争共享信道的访问。这是同步碰撞的理想配方，在同步碰撞中，任何车辆都无法保证可靠的信标传输。我们考虑从当前争用窗口中选择退避时隙的问题，以提供由主题车辆传输到其邻居的信标的可靠传递。考虑到安全情况，我们提出了一种伪随机数生成器（PRNG）启发的退避选择（PBS）技术。所提出的技术基于这样的假设，即如果其所有邻居选择不同的退避时隙（即，不是本车辆选择的退避时隙），则可以减少由本车辆发送的信标的同步冲突。离散事件模拟表明，与IEEE 802.11p中的统一随机概率后退选择相比，PBS可以增加从主题车辆接收的总体消息。

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