Ad Hoc Networks
Ad Hoc Networks
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DOI：
10.1007/978-3-642-29096-1
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发表时间：
2011
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在本文中，我们研究和改进的恢复性能时，面对网络故障的情况下，单一和多路径路由策略。特别是，我们专注于我们的研究两个MANET路由协议：OLSR和它的多路径扩展MP-OLSR。在各种无线多跳网络环境中，特别是在多链拓扑结构中，我们定义并寻求评估这些协议引入的延迟，以找到一个新的路径后，链路故障。理论估计和仿真结果表明，在双链拓扑结构下，该延迟可能太长，并且与丢失和延迟受限的应用的需求不相容。由于通常链路状态协议的公知性质，特别是OLSR拓扑控制（TC）消息的公知性质所引起的延迟，源节点不能立即检测到链路故障，因此这些节点继续沿着沿着断开的路径发送分组。因此，我们研究的实际网络拓扑结构和节点的自己的表示之间的不一致。在分析了这种长延迟的后果后，我们试图通过引入适应机制来缓解这些问题。我们提出了三个新的不同的方案，并相应地扩展了原有的OLSR和MP-OLSR协议，以减少预期的延迟，提高协议的性能。仿真结果显示，在双链拓扑中使用这些新方案时，延迟急剧下降。我们还讨论了这些结果的数据包丢失，端到端的延迟和开销。
In this paper, we study and improve the recovery properties of single and multipath routing strategies when facing network failure situations. In particular, we focus our study on two MANET routing protocols: OLSR and its multipath extension MP-OLSR. In various wireless multi-hop network environments, especially in multiple chain topologies, we define and seek to evaluate the latency introduced by these protocols to find a new path after a link failure. Theoretical estimations and simulation results show that, under dual chain-topologies, this latency can be too long and incompatible with the needs of loss and delay constrained applications. As the source nodes cannot detect link failures immediately because of the delay incurred by the well-known nature of link state protocols in general, and of OLSR Topology Control (TC) messages in particular, these nodes keep sending packets along broken paths. We thus study the inconsistencies between the actual network topology and the nodes' own representation. After analyzing the consequences of this long latency, we seek to alleviate these problems with the introduction of adapted mechanisms. We propose three new different schemes and accordingly extend the original OLSR and MP-OLSR protocols in order to decrease the expected latency and improve the protocol performance. Simulation results show a steep decrease of the latency when using these new schemes in dual chain-topologies. We also discuss these results in terms of packet loss, end-to-end delay and overhead.