Dynamic Hello/Timeout timer adjustment in routing protocols for reducing overhead in MANETs
Dynamic Hello/Timeout timer adjustment in routing protocols for reducing overhead in MANETs
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DOI：
10.1016/j.comcom.2010.06.011
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发表时间：
2010-09
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影响因子：
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通讯作者：
Nelson Hernandez-Cons;S. Kasahara;Yutaka Takahashi
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文献类型：
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作者：
Nelson Hernandez-Cons;S. Kasahara;Yutaka Takahashi
随着最近移动设备的进步和广泛传播，用这些设备建立网络变得比以往任何时候都更加重要。manet（移动自组织网络）已经成为一个有前途的解决方案，以建立一个网络与任何移动设备。由于节点的移动性会影响本地连接，使网络拓扑结构不断变化，路由问题一直是MANET中的一个难题。MANET中的传统路由协议通过发送周期性消息来实现拓扑结构的变化，从而使本地连接保持最新状态。但是，以固定速率发送周期性消息可能会在可以防止和减少开销的情况下造成开销。在本文中，我们介绍了一种以减少开销为重点的方案来提高在MANET中使用的路由协议的性能。在该方案中，我们使用链路变化率估计来动态调整每个节点发送控制消息的速率，而不是以固定的速率发送周期性消息。链路变化率估计是基于对反映网络状况的本地连通性的恒定测量。我们使用ns-2来评估我们的方案的性能，并将其与其他方法进行比较以显示其优势。通过使用我们的方案，我们注意到在不牺牲测试协议的整体性能的情况下，开销大大减少。
With the recent advancement and extensive spread of mobile devices, establishing a network with those devices has become more important than ever before. MANETs (Mobile Ad hoc NETworks) have become a promising solution to set up a network with any mobile device. Routing in MANET is still a difficult task since the mobility of the nodes affects the local connections and makes the network topology change constantly. Traditional routing protocols in MANET work sending periodic messages to realize the changes in the topology in order to maintain the local connections up-to-date. However, sending periodic messages at a fixed rate can cause overhead in situations where it can be prevented and thus reduced. In this paper, we introduce a scheme to improve the performance of the routing protocols used in MANET focusing on the reduction of the overhead. In the proposed scheme, instead of sending periodic messages at a fixed rate, we use a link change rate estimation to dynamically adjust the rate at which each node sends the control messages. The link change rate estimation is based on the constant measurement of the local connectivity that reflects the network conditions. We evaluate the performance of our scheme using ns-2 and we compare it to other approaches to show its advantages. With the usage of our scheme, we notice a considerable reduction of the overhead without sacrificing the overall performance of the tested protocols.