With the dynamic and mobile nature of ad hoc wireless networks, links may fail due to topological changes by mobile nodes. As the degree of mobility increases, the wireless network would suffer more link errors. Ad hoc routing protocols that use broadcast to discover routes may become inefficient due to frequent failures of intermediate connections in an end-to-end communication. When an intermediate link breaks, it is beneficial to discover a new route locally without resorting to an end-to-end route discovery. Based on the concept of localizing the route request query, we propose an efficient approach to repair error links quickly. The approach can apply to the Ad hoc On-demand Distance Vector (AODV) routing protocol. As an enhancement to AODV, the proposed approach leads to two routing protocols, called AODV-LRQ and AODV-LRT, which are aimed to efficiently repair the link errors. To evaluate the effects of the route repair, we define a factor, called bonus gain, as the ratio between the throughput increment to the routing overhead increment. Simulation results show that the proposed methods can get high bonus gain, that is, it can maintain the throughput as well as reduce the routing overheads.
Abstract. We presents a power-aware routing protocol called MultiRoute Transmission Routing that utilizes multiple routes to transmit the data traffic simultaneously and leads to a balanced energy consumption. The proposed routing approach can extend the system lifetime of the network. A new routing decision index is also proposed for the route selection mechanism, which takes both the shortest-path and the maximum system lifetime into consideration and dynamically adjusts its weight between them according to the energy usage of the network. Experiment results show that, the proposed routing protocol provides a higher performance than other well-known power-aware routing protocols in terms of the energy-efficiency.
In mobile devices, the battery-based power is a precious resource. To maximize the network lifetime becomes a challenge issue in MANETs. We found that transmission collision is a problem which affects the energy saving much. If we can reduce the numbers of the transmission collision, we save more power. In this paper, we propose a new mechanism to address this problem and hence prolong network lifetime. Our approach, based on Relative Neighborhood Graph (RNG), adjusts the transmission range according to the degree of the node which is only based on local information. We also suggest appropriate transmission power ranges to some routing protocols such as AODV, DSR and BELLMAN-FORD. Simulation results show that a great improvement of the energy saving for those routing protocolss when comparing with the performance of those protocols without applying our mechanism.
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