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首页> 外文期刊>Journal of computer sciences >PERFORMANCE EVALUATION OF PROBABILISTIC RELAY IN AD HOC ON-DEMAND DISTANCE VECTOR AND AD HOC ON-DEMAND MULTIPATH DISTANCE VECTOR UNDER HIGHLY DYNAMIC ENVIRONMENTS | Science Publications
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PERFORMANCE EVALUATION OF PROBABILISTIC RELAY IN AD HOC ON-DEMAND DISTANCE VECTOR AND AD HOC ON-DEMAND MULTIPATH DISTANCE VECTOR UNDER HIGHLY DYNAMIC ENVIRONMENTS | Science Publications

机译：动态环境下AD HOC随需应变矢量和AD HOC按需多路径遥测矢量的概率继电器性能评估|德州仪器TI.com.cn科学出版物

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> Vehicular Ad hoc Networks (VANETs) are a specific class of Mobile Ad hoc Networks (MANETs). Since vehicles tend to move in a high speed, the network topology is rapidly changed. Thus vehicle?s connectivity problem is one of the interesting issues in VANETs. Ad hoc On-demand Multipath Distance Vector (AOMDV) is an extended version of ad hoc on-demand distance vector (AODV). AOMDV is designed to overcome a connectivity problem due to highly dynamic network topology. It provides multipath for data packets delivery from the source to the destination. However, AOMDV?s multipath establishment and maintenance generate more control packets than those of AODV?s unipath. Meanwhile, both protocols degrade their performance when the vehicle speed is increasing. Thus in this study, we added probabilistic relay, which enables adjacent vehicles to probabilistically relay unsuccessful data packet transmission into IEEE 802.11 as a MAC standard model and proposed AODV with Probabilistic Relay (AODV-PR) and AOMDV with Probabilistic Relay (AOMDV-PR). Based on our simulation results, the addition of probabilistic relay clearly helps those protocols to improve their performances especially in packet delivery ratio under highly dynamic environments. Probabilistic relay adds the number of generated beacon messages, but does not produce any additional routing messages. We evaluate those protocol performances based on several metrics such as packet delivery ratio, routing overhead, average delivery delay, hop count and number of relays under variation of vehicle speed and beacon interval. We show that beacon interval has a huge influence in the performance of AODV-PR and AOMDV-PR especially for their routing overhead.
机译： >车载自组织网络（VANET）是一类特定的移动自组织网络（MANET）。由于车辆倾向于高速行驶，因此网络拓扑迅速变化。因此，车辆的连通性问题是VANET中有趣的问题之一。 Ad hoc点播多路径距离矢量（AOMDV）是ad hoc点播距离矢量（AODV）的扩展版本。 AOMDV旨在克服由于高度动态的网络拓扑而导致的连接性问题。它为从源到目标的数据包传递提供了多路径。但是，AOMDV的多路径建立和维护比AODV的单路径产生更多的控制数据包。同时，当车速增加时，两种协议都会降低其性能。因此，在本研究中，我们添加了概率中继，使相邻车辆能够将不成功的数据包传输概率中继到作为MAC标准模型的IEEE 802.11中，并提出了带概率中继的AODV（AODV-PR）和带概率中继的AOMDV（AOMDV-PR） 。根据我们的仿真结果，添加概率中继显然可以帮助那些协议提高其性能，尤其是在高动态环境下的数据包传输率方面。概率中继会添加生成的信标消息的数量，但不会产生任何其他路由消息。我们基于几种指标来评估那些协议性能，例如数据包传输率，路由开销，平均传输延迟，跳数和在车速和信标间隔变化下的中继数量。我们表明，信标间隔对AODV-PR和AOMDV-PR的性能有很大的影响，尤其是它们的路由开销。

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