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Energy efficient topology in Ad-hoc networks can be achieved mainly in two different ways. In the first method, network maintains a small number of nodes to form a connected backbone and the remaining nodes sleep to conserve energy. This method is effective for low traffic networks. Energy efficiency in the second method is achieved by power control technique. This technique is effective in high traffic...
The Vehicular Ad hoc Network (VANET), a subset of Mobile Ad hoc Network, is used in many applications such as assisting driver with signage, road traffic reporting, telling the way, etc. Since VANET has highly dynamic topology and various vehicle densities, developing a routing protocol that can satisfy above applications requirements is a great challenge. In this paper, we present an efficient Road...
The inherent uncertainty in wireless mobile ad hoc networks (MANET), due to nodal mobility, unstable links, and limited resources, frequently renders routing paths unusable. Due to the unpredictable movement of mobile nodes, the network topology of a mobile ad hoc network changes frequently. It will directly cause the routes to be broken and greatly degrade the network performance. However, selecting...
Ad hoc networks are useful for providing communication support where no fixed infrastructure exists or the deployment of a fixed infrastructure is not economically profitable, and movement of communicating parties are allowed. Due to the dynamic topology, developing better routing protocol became a challenging task. The Dynamic Source Routing (DSR) protocol is a simple and efficient routing protocol...
Cognitive radio ad hoc networks (CRAHNs) solve the problem of spectrum utilization when the licensed or primary user (PU) activity changes over time. This affects not only the spectrum availability, but also the network topology, making the analysis of scaling laws very challenging. Currently, the effect of PU activity on the network scaling laws has not been theoretically analyzed, to the best of...
The Ad Hoc network is a dynamic topology and self organization network. In allusion to the Ad Hoc network dynamic movement characteristic, present an ant colony Optimization algorithm (ANRBA) for the Ad Hoc network routing based on the network link and node status. In the ANRBA, it uses the load accepted rate, topology variety rate and routing delay time as measurement value to select the routing...
A Vehicular Ad Hoc Network (VANET) not only experiences highly mobile and frequently disconnected, but may also have to deal with rapid changes of network topologies, especially when accidents and road traffic jams happen. In this paper, we propose a novel approach to address this issue. Due to the intermittent connectivity in VANET, we adopt the idea of carry and forward, where a moving vehicle carries...
Current trends in applications, services and socializing increase demands for network infrastructures, capable of supporting real-time traffic and Quality of Service (QoS). In this work, we aim at improving the inherently stringent wireless multi-hop network structure, based on the notion of inverse Topology Control (iTC). Taking into account socially-induced network churn operations, we focus on...
Doing research on mobile ad hoc network (MANET) security involves several constraints, some of which are wireless environment's attributes, such as bandwidth and delay, and the correctness of network topology. Testing and evaluating using real wireless devices are costly and somehow impractical, so many tools have been developed in order to create media by which researchers can deeply investigate...
Routing protocols for mobile ad hoc networks have been researched for several decades. However, it's not an easy task to implement or apply effective routing algorithm for them due to their characteristics, namely highly dynamic topology and limited resources. Traditional ad hoc routing protocols find the best path in terms of delay or hop count which can lead to network congestion in high traffic...
Link state routing protocols such as OSPF synchronize the topology databases by flooding link state update messages periodically or whenever there is a connectivity change. When deployed in wireless networks with mobility and noisy channels, OSPF incurs frequent link creation and deletion and subsequent route changes. To cope with this problem, we propose an Adaptive Link Establishment (ALE) scheme...
Geographic forwarding has been widely studied as a routing strategy for mobile ad hoc networks, mainly due to the low complexity, scalability of the routing algorithm. However, in a network with routing holes, existing geographic routing schemes such as GPSR, GOAFR could cause the throughput capacity to drop significantly due to concentration of traffic on the face of the holes. The slope-based stateless...
Frequent changes of network topology may lead to frequent changes of routing, and instability of routing is one of important factors that cause descendent of Ad hoc performance. To address the application of Ad hoc network in emergency communication environment as disaster relief and military, as the neighbor nodes around some node are fixed in a certain period of time, based on analysis of solutions...
This paper addresses the problem of efficient data dissemination in Vehicular Ad Hoc Networks (VANETs), which particularly suffer from changing densities in the network topology due to congested and sparse traffic on the roads. We present a new network layer protocol in the family of geographic network protocols, which makes use of distance and time information following a dissemination strategy to...
In this paper we present a full performance analysis of an energy conserving routing protocol in mobile ad hoc network, named EM-AODV (Energy Multi-path Ad-hoc On-demand Distance Vector routing). EM-AODV is a reactive routing protocol which combines two mechanisms used in the basic AODV protocol. AODV and most of the on demand ad hoc routing protocols use single route reply along reverse path. Rapid...
In recent years, MANETs are continuing to attract the attention for their potential use in several fields such as military activities, rescue operations and time-critical applications. In this paper, we present the implementation and analysis of our implemented MANET testbed considering AODV and OLSR protocols for wireless multi-hop networking. We investigate the effect of mobility and topology changing...
Mobile Ad hoc network is a self-organizing, multi-hop and wireless network. This kind of networking is convenient to construct because it is free of time and space and it can be constructed without infrastructure. It has been widely used on many occasions such as danger zones, military regions, hospital and family. Due to the dynamic changes of topology, Ad hoc network has its particularity of routing...
With the advantages of asynchronous and loosely coupled communication model, the Publish/Subscribe system has been widely spread in large-scale distributed mobile networks. According to the MANET's characteristics of dynamic topology and bandwidth-constraint, we propose an application scheme of Publish/Subscribe system over clustering MANET. We improve the cluster header by adding the Information...
Without any pre-existing fixed network infrastructure with rapid configuration of wireless connections on-the-fly, network topology in MANETs keep on changing rapidly. Thus achieving data transmissions between wireless nodes in MANETs with improved QoS parameters become a challenging issue. To achieve this one has to concentrate on the routing protocol they choose. In our paper we proposed an algorithm...
Without any pre-existing fixed network infrastructure with rapid configuration of wireless connections on-the-fly, network topology in MANETs keep on changing rapidly. Thus achieving data transmissions between wireless nodes in MANETs with improved QoS parameters become a challenging issue. To achieve this one has to concentrate on the routing protocol they choose. In our paper we proposed an algorithm...
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