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The Prophet routing algorithm is a multi-copy algorithm which is based on historical information and transitive probability, which selects the relay node with a high probability to encounter the destination node. However, the selection of a relay node does not consider the current congestion level of node. Even if the current relay node has a high delivery probability to the destination node, it may...
DTNs overcome the problems associated with intermittent connectivity, long or variable delay, asymmetric data rates, and high error rates by using store-carry-forward message switching. In DTNs, a node is an entity with a bundle layer. A node may be a host, router, or gateway (or some combination) acting as a source, destination, or forwarder of bundles. In addition, the performance of node shows...
Delay Tolerant Networks (DTNs) is a mobile wireless network, in which it is difficult to establish end-to-end paths. Meanwhile, the nodes transmit message copies randomly, resulting in a high overhead of message propagation. In this paper, a Transfer Utility of Node Spray and Wait (TUoN-SNW) routing is proposed to forward the message copies dynamically, which avoid randomness of Spray and Wait routing...
In a Bluetooth Low Energy (BTLE) piconet, the master node controls the channel access by a simple polling scheme. Due to an absence of coordination among independent master nodes while accessing the wireless medium, devices will encounter high packet interference if many piconets are simultaneously operating in the same area. In this paper, we propose two schemes in the converged BTLE and cellular...
Blasting and controlling technique of isolated and steep rock slope, differing from common blasting, have the special complexity. While, in the course of blasting design and implementation, the rock geology characteristic and environment should be sufficiently realized, and the scheme of blasting and valid protection measures should be established. According to the structural characteristic of rock...
Delay Tolerant Network is an emerging research field. In this network, a long period of network partition happens frequently. In this paper, we present the notion of QoN (Quality of Node) based on the differences of node activity. Then we introduce the notion of QoN to forward the number of message copies dynamically to improve the Binary Spray and Wait routing. This Protocol can avoid the blindness...
Researching on delay tolerant networks is an emerging field. Many researchers are dedicated to the approach of the routing algorithms and its applications. With sufficient energy in the core-nodes in the networks, a nested source spray and wait routing algorithm, which is ameliorated from source spray and wait routing algorithm, has been put forward in this paper. The simulation results indicate that...
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