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Delay Tolerant Networks (DTNs) differ from the traditional Mobile Ad Hoc networks (MANETs) in that DTNs are not always interconnected. The issue of routing data in a DTN is considered here. Many routing protocols exist for DTNs. Some are based on comparing nodes to each other, whereas others focus on the internal properties of the messages they hold. There are wide ranges of protocols, and they perform...
It is well-known that the spurious fast retransmission and timeout widely exist in the course of vertical handover when a mobile node (MN) moves from a longer transmission delay network into a shorter one. Some solutions for the problems have been discussed in a lot of literatures for non-Cognitive Radio (non-CR) scenarios. One of them, bicasting is the main method to improve the transmission performance...
Advancement in evolution of Internet technologies like 3G, 4G, and 5G, there is a need of good quality of service (QoS) for such wireless networks. Faster responses are required for various queries raised by mobile terminals (MTs) from any mobile computing environment. There has been many research works proposed in the past to address the QoS issue by using an Invalidation Report (IR)-based cache...
Delay-Tolerant Mobile Sensor Network (DTMSN) distinguishes itself from traditional Wireless Sensor Network by several distinctive characteristics. Since end-to-end connections in DTMSN exist with certain probability, the conventional routing protocols for WSN may achieve poor network performance under these challenging scenarios. Hotspot-Based Adaptive Routing (HAR) is a routing scheme designed for...
Media streaming in automotive environments is becoming more important with the proliferation of 3G/4G technologies and the general demand for consuming Internet content in cars. Especially the rising popularity of Music on Demand and Media Cloud Storage services pushes automotive manufactures efforts to provide decent music streaming capabilities in vehicles. Two major issues have to be tackled to...
This paper addresses security and performance issues of MANET. A novel cluster oriented concept is proposed to enhance security and efficiency of the network. Proposed strategy insures the optimum performance of MANET in presence of black hole attack. The simulation of the proposed methodology is carried out using NS2 network simulator and the simulation results reflects the performance of scheme...
With the aim of prolonging network lifetime, many energy efficient algorithms and data dissemination protocols have been proposed for wireless sensor networks (WSNs) recently. Since sensor nodes close to sink have to bear more traffic burden to forward data, they will quickly deplete their energy which leads to energy hole and network partition problem. Adding mobility into sensor networks brings...
Machine-to-Machine (M2M) communicationsaims to enablemachines to communicate with each other withouthuman intervention. The M2M traffic is quite different from Human-to-Human (H2H) traffic. Discontinuous reception (DRX) isone of the promising technologies for energy saving in LTE-A networks. The existing works on DRX pay more attention to H2H traffic, especially focusing on DRX in RRC active mode...
Congestion in DTNs happens when the forwarding path to destination does not exist and a node runs out of buffer space. Several works have shown that the situation is hard to mitigate. Consequently, to choose the right message to drop is a crucial task. Moreover, there has not been much attention to the buffer management policy in the Social-DTNs contexts. Therefore, an efficient buffer management...
Message flooding has been extensively used in wireless mobile ad hoc networks for activities such as route and resource discovery. This can potentially lead to high channel contention, causing redundant retransmissions and thus excessive packet collisions in the network. Such a phenomenon has been shown to greatly increase the network communication overhead and end-to-end delay. In this paper, we...
The aim of this paper is to present a novel multipath routing approach in MANETs as new extensions to AODV, a well-known traditional reactive routing protocol. The approach is called Threshold efficient Routes in multipath AODV (TRAODV) which is a link-disjoint multipath extension that tries to optimise routing delay overhead in the route discovery process of traditional AODV. The optimisation in...
In this paper, we analyze a new type of delay tolerant networks (DTN) where each node owns multiple dedicated messengers, called pigeons. The only form of inter- node communication is for a pigeon to periodically carry a batch of messages originated at the home node, deliver to the corresponding destination nodes and return home. We name this as homing-pigeon (HoP) based routing mechanism, which is...
Sink mobility has become an increasingly important requirement of various sensor network applications. Handling such mobile sink conditions brings new challenges to large-scale sensor networking. This investigation proposed a hybrid-structure routing protocol (HSRP) that combines the benefits of grid-based and cluster-based structures. Grid-based structure is designed to solve the cluster head selection...
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