Avoiding Asymmetric Link and Link Break by Using RSSI Information

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Most of the existing routing protocols treat the wireless links as symmetric and periodic beacons are employed to detect the link connectivity. However, in the ubiquitous communication environment, different transmitting power due to power control or different capability of the batteries, or different antenna gain between the sender and the receiver, may result in asymmetric links over which one node can hear its neighbors, but not vice versa. Of the currently proposed protocols, the reactive routing protocols have much trouble in the presence of asymmetric links. In this paper, we propose to detect and avoid asymmetric links, and enhance the well-known on-demand routing protocol AODV. The hello packets, appended with optimized link states, are used to detect and avoid the asymmetric links both during the route discovery and in the communication. Received Signal Strength Indicator (RSSI) is contained in the link state, and used to predict the RSSI for either direction of the link when a data packet is to be forwarded. In this way, the asymmetric or broken links can be detected quickly. When the predicted RSSI is near the receivable threshold, the node may temporarily increase its transmitting power so that its neighbors can hear clearly. Hence, the links that are not seriously asymmetric can still be used and unnecessary route discovery can be avoided. Simulation results show that our protocol achieves higher packet delivery ratio and throughput while keeping almost the same packet overhead as the original AODV protocol.
社団法人電子情報通信学会の論文
2005-05-19

Avoiding Asymmetric Link and Link Break by Using RSSI Information

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