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This paper comes up with a SDN based On-Demand Routing Protocol, SVAO, which separates data forwarding layer and network control layer, as in SDN, to enhance the data transmission efficiency within VANETs. The Roadside Service Unit plays the role of Local Controller and is in charge of selecting vehicles to forward packet within a road segment. All the vehicles state in the road. Correspondingly,...
Topology control for ad-hoc networks is crucial due to the absence of a fixed infrastructure that can guarantee satisfactory connectivity among communication nodes. In this paper, we study the impacts of adjustment of transmission power as a means to control the network topology (connectivity) to the signal-to-interference-plus-noise (SINR) ratio and the number of hops between two nodes, where the...
Smart Metering Infrastructure is an integral part of the Smart Power Grid Revolution. Wireless Ad-hoc Network is considered a promising candidate for enabling smart metering communications. This paper investigates which kind of Ad-hoc routing scheme (proactive, reactive and hybrid) will be most suitable for Smart Metering Infrastructure. Simulation studies utilizing three different topologies are...
Advanced wireless networking technologies are expected to assist a human life comfortably. In this scenario, high quality real-time communication is important. This paper proposes a novel User Datagram Protocol (UDP) with rate-based congestion control to achieve Quality of Service (QoS) in wireless Ad-Hoc network.
The number of nodes within 1-hop range plays an important role in determination of ad-hoc network performance. The more the number of 1-hop neighbor increases, the more routing traffic is generated. Although there have been several studies on the optimal number of 1-hop neighbor nodes, they had not considered routing overhead. In this study, we derive new optimal number of 1-hop neighbor nodes to...
The increasing popularity of wireless networks indicates that wireless links will play an important role in future inter-networks. Among the wireless networks, wireless ad hoc networks have been popular because they are very easy to implement without using base stations. Transmission Control Protocol (TCP) and routing protocols (DSR, DSDV, AODV, etc) as well as link layer protocols are becoming as...
Network lifetime is one of the most important parameters in ad-hoc wireless networks, and it is not only constrained by the battery capacity of the nodes in the networks but also by the energy efficient operation of the nodes. This paper evaluates energy consumption and network lifetime in a rectangular network model based on the Geographical Adaptive Fidelity (GAF) topology management protocol. We...
Mobile ad hoc network consists of collection of wireless mobile nodes dynamically forming a network without the use of any existing network infrastructure. Each node act as both host and router and communicate with other if they are within the radio range. The dynamic topology of wireless mobile ad hoc networks make routing is challenging one. Routing protocols for mobile ad hoc networks (MANETs)...
Without any control mechanism, a wireless ad-hoc network is easily congested and the perceived quality of applications considerably deteriorates. Therefore, we need QoS control mechanisms to accommodate real-time multimedia application such as video conferencing, VoIP (voice over IP), and remote monitoring while satisfying application QoS requirements. In this paper, we propose a new routing mechanism...
Topology control is an effective measure at network layer to implement power control for energy-saving, which is a critical issue in ad-hoc wireless networks. Topology control also affects other significant performances of network, such as packet delivery radio, end-to-end delay, and network capacity etc. Various techniques and algorithms have been proposed to achieve the optimal topology which can...
We consider ad-hoc wireless networks and the topology control problem defined as minimizing the amount of power needed to maintain connectivity. The issue boils down to selecting the optimum transmission power level at each node based on the position information of reachable nodes. Local decisions regarding the transmission power level induce a subgraph of the maximum powered graph Gmax in which edges...
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