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Wireless communication technologies such as microwave radios are used to provide high-speed mobile backhaul connectivity for radio access networks in cases in which wire-based alternatives, e.g. cable or fiber, are not readily available and cannot be deployed in an economic or timely manner. Current mobile backhauls are predominantly deployed in tree or ring topologies, which simplify traffic management...
In order to facilitate communication among the active stations on a mobile ad-hoc network (MANET), a routing protocol is used to discover routes between stations. It plays an important role for the overall performance of a MANET. There are factors such as mobility, network size, network load, bandwidth, and signal strength affecting the performance of routing protocols. This paper aims to study the...
IEEE 802.15.4 is the emerging next generation wireless standard designed for low-rate wireless personal area networks (LR-WPAN), which suit wireless sensor networks applications. It attempts to provide a low cost, low power and short range wireless networking. The QoS is more challenging in heterogeneous wireless sensors networks, where a diverse mixture of sensors for monitoring temperature, pressure,...
Wireless Mesh Network (WMN) has been considered as a key emerging technology to construct next generation wireless communication networks. It combines the advantages of both mobile ad-hoc network (MANET) and traditional fixed network, attracting significant industrial and academic attentions. In WMN, the load balancing becomes a hot topic in enhancing the QoS provision as a load balanced WMN exhibits...
In this work we present a model to simulate high traffic load using Manet. The Manet topology is studied in three different scenarios with different loads and the minimal capacities for wireless connection between cluster heads, among nodes with corresponding cluster heads, and the minimal capacity for a node to become a cluster head is attained in order to assure the network function. The problem...
In order to operate as efficiently as possible, appropriate on-demand routing protocols have to be incorporated in the ad hoc networks. Most common routing protocols, simply assume that all network links are bidirectional, and thus may need additional protocol actions to remove unidirectional links from route computations. The proposed algorithm makes use of selective unidirectional links so that...
Routing in mobile ad hoc networks (MANETs) is central to their proper functioning. Mobility in such networks makes the routing a real challenging task. Routes validity plays a central leveraging mission to enhance network performances. Forwarding through incorrect routes not only results in traffic wandering inside the network without ever being able to be delivered to their ultimate destinations...
Certificate validation based on PKIX protocols does not work well under the particular conditions found in a MANET: Episodic connectivity and low bandwidth. We propose an overlay network of validation proxy servers which exploit cooperative caching of recent validation results. The proxy overlay improves the availability of the validation service and reduces the network traffic. The design employs...
The present work focuses on emulation and validation of protocol stacks for MANETs (mobile ad-hoc networks) that must support multimedia applications in a tactical environment. We considered a network consisting of some tens of mobile nodes, with randomly variable speeds in the order of some tens of km/h. Nodes are deployed on a scenario of a few km2 and have a radio range of some hundreds of meters...
In delay tolerant networks (DTNs), message ferries exploit controlled mobility to forward messages following specific routes. One of the key challenges is how to design ferry routes to achieve desired connectivity properties and store-and-forward performance. There are some attempts at designing appropriate ferry routes, but the region topology, which denotes the adjacency relationships of ferry regions...
Many kinds of communication networks, in particular social and opportunistic networks, rely at least partly on on humans to help move data across the network. Human altruistic behavior is an important factor determining the feasibility of such a system. In this paper, we study the impact of different distributions of altruism on the throughput and delay of mobile social communication system. We evaluate...
MANETs lack natural concentration points at which a single dedicated node can monitor all network traffic for intrusions. Consequently, detecting attacks on MANETs requires distributed, cooperative intrusion detection techniques. We examine an approach to organizing a cooperative intrusion detection system for MANETs as a dynamic hierarchy that adapts to changes in topology and other environmental...
Energy conservation is a critical issue regarding wireless mobile ad hoc networks, since the nodes are battery restrained and the depletion of their power defines the lifetime of the network. This paper presents the PAST-EnDRoP: position aided spatial TDMA (PA-STDMA) MAC protocol with Energy and delay constrained routing for mobile ad hoc networks. It is a novel approach designed for optimized channel...
This article presented landmark overlays for urban vehicular routing environments (LOUVRE), a density-based landmark overlay routing protocol for urban vehicular environments. We described the concept and the protocol as well as a novel distributed traffic density estimation scheme. We implemented the protocol in Qualnet and evaluated the feasibility of LOUVRE by comparing it with the benchmarks GPSR...
Cognitive radio (CR) improves utilization of the overall radio spectrum through dynamic adaptation to local spectrum availability. In CR networks, unlicensed or secondary users (SUs) may operate in underutilized spectrum owned by the licensed or primary users (PUs) conditional upon PU encountering acceptable interference levels. A cognitive wireless ad hoc network (CWAN) is a multihop self-organized...
Streaming applications will rapidly develop and contribute a significant amount of traffic in the near future. A problem, scarcely addressed so far, is how to support streaming traffic in vehicular networks (VANETs). This problem significantly differs from previous work on broadcast and multicast in ad hoc networks, because of the highly-dynamic topology of VANETs and the strict delay requirements...
In this paper, we modify and extend epidemic routing used in intermittent networks such as delay tolerant networks (DTNs). In particular, we propose to include immunity-based information disseminated in the reverse direction once messages get delivered to their destination. There are many variants of epidemic routing that are intended to result in better resource utilization by reducing the number...
This paper describes the identification of potential problems with ad hoc routing protocol that contribute to the overall performance. Another major factor that contributes to routing protocol performance is when wireless nodes move out of coverage area of the other nodes and thus lose connection, or the opposite, where other wireless nodes join the network while on the move and require a dynamic...
To support energy-efficient routing, accurate state information about energy level should be available. But due to bandwidth constraints, communication costs, high loss rate and the dynamic topology of MANETs, collecting and maintaining up-to-date state information is a non-trivial task. In this work, we use Optimized Link State Routing (OLSR) as the underlying routing protocol and focus on residual...
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