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In recent year with the widespread use of mobile device, Mobile Ad hoc networks (MANETs) technology has been attracted attention day by day. Due to MANETs don't need the infrastructure, it can deploy fast and conveniently in any environment. Because of its easy deployment features, in addition to used in personal area networks, home area networks and so on. Specially, MANETs suit for military operations...
Because of limited bandwidth and dynamic topology, it is difficult to provide QoS(Quality of Service) guarantee in ad hoc networks. The aim of the paper is to utilize the wireless resources efficiently and to meet QoS requirements of multimedia applications in ad hoc networks. Here, the model of Policy-based Cross-layer QoS design for Ad hoc Networks is introduced. Then a cross-layer routing protocol...
Methods to improve the reliability and optimize the system latency of our own-developed ZigBee remote sensing system are introduced in this paper. The concept of this system utilizes the ZigBee network to transmit sensor information and process them at both local and remote databases. The enhancement has been done in different parts in this system. In the ZigBee network part, the network topology...
Due to their diverse applications, ad hoc networks are appealing for use in many domains. However, their features of open medium, absence of infrastructure, dynamic changing network topology, cooperative algorithms, lack of centralized monitoring and management point, resource constraints and lack of a clear line of defense, they are vulnerable to many attacks. Therefore, there is a major concern...
In mobile ad hoc networks the nodes are dynamically changing and they have a fully decentralized topology. Hence, security is hard to achieve due to the dynamic nature of the relationships between the participating nodes as well as the vulnerabilities and limitations of the wireless transmissions medium. We proposed a novel agent based framework to monitor, detect, and isolate misbehaving nodes in...
Wireless sensor networks have the problem of lifetime and scalability. To increase lifetime and scalability itpsilas necessary to have control over topology of the network. Dynamic clustering with adaptive feature is the best way to achieve the above. In this paper we propose a dynamic multilevel hierarchal clustering (DMH) approach for sensor networks. The proposed approach will create a dynamic...
In a wireless sensor network (WSN), we can rarely assume the static network topology hypothesis. In fact, the topology may change due to unit and communication faults, energy availability, and environmental dynamics-situations that could prevent the acquired data to be successfully routed to the base station (BS). In recent years, many self-organizing routing algorithms that provide topology adaptation...
Ambient Intelligence scenarios can be deployed even when the environment lacks of a underlying network infrastructure. This can be done using distributed ad-hoc networks. Ambient Intelligence applications can be highly variable and networks can have an unanticipated number of members. Inappropriate distributed network topologies can lead to unstable and inefficient communication. We propose PALTA,...
Wireless sensor nodes can organize themselves after deployment in a large scale ad hoc network topology. Some traditional Ad hoc routing protocols do not take into account that a sensor node has limited capacities, e.g. energy. Therefore, they try to perform the sensing task regardless of the maximum hops and duration it takes. In wireless sensor networks (WSNs), this routing solution is unrealistic;...
The diversity of the applications supported by wireless ad hoc and sensor networks explain the success of these networks. However, their energy constrained nature requires the use of energy efficient strategies to maximize network lifetime. We can classify these strategies in four categories: 1. energy efficient routing, 2. scheduling the nodes sleeping state, 3. topology control by tuning node transmission...
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