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首页> 外文期刊>International journal of communication systems >An effective back-off selection technique for reliable beacon reception in VANETs
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An effective back-off selection technique for reliable beacon reception in VANETs

机译：VANET中可靠的信标接收有效的备用选择技术

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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：在安全临界场景中，由主题车辆传输的信标的可靠接收对于避免车辆碰撞至关重要。根据IEEE 802.11p中的使用争用窗口尺寸，信标以小的争用窗口大小传输。结果，通过选择相同的退避槽来争取共享信道访问的多个车辆。这是用于同步碰撞的完美配方，其中任何车辆不能保证可靠的信标输送。我们考虑从当前争用窗口中选择退避槽的问题，以提供由主车辆传输到其邻居的可靠递送信标。鉴于安全方案，我们提出了一个伪随机数生成器（PRNG） - 丝网次关闭选择（PBS）技术。所提出的技术对假设有效：如果所有其邻居选择不同的退避时隙（即，不是由主题车辆选择的退避槽），则可以减少由主题车辆发送的信标的信标的同步冲突。离散事件模拟表明PBS可以与IEEE 802.11p中的均匀随机概率反脱离选择相比，PBS可以从主题车辆增加总消息接收。

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