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Mobile Ad Hoc Network consists of a large number of nodes. When we work with a large network with dense nodes, there are some nodes that have to bear the heavy traffic load, then over the time such nodes become weak and they start losing the packet. This packet loss is bearable up to some threshold value, but as the packet loss exceed this level, it disturb the whole network and now any kind of data...
In this paper we investigate the search path when building a wireless mesh network under extended ad-hoc network, and we propose a search method that can reduce power consumption. The route search part and the node part - which can be a mobile PC or a mobile phone, etc. -are combined in the proposed method. Moreover, we aim at improving the efficiency of the communication between nodes under the extended...
In most articles dataflow in computer networks is described as a transfer function. Numerators, denominators and delay times give behaviors of these systems. Some systems show linear features, others have non-linear ones. All descriptions have some special results. Some of them present linear aspects of transfers, while other ones look for bottlenecks of the networks or prove stability of the systems...
Routing delivery is one of the key techniques in mobile ad hoc network, which involves many aspects such as topology update, routing exchange and so on. In this paper, we firstly apply routing tree to describe the complete topology of ad hoc network, and then store the information of routing tree into every node's routing table. Sparse routing tree, as a pruned tree, is used to exchange topology information,...
In order to balance power usage in heterogeneous sensor networks, the LBGC (Load balancing group clustering) strategy is proposed based on the clustering model. The LBGC protocol periodically selects cluster heads and implements dynamic route calculation according to the condition of energy distributing of network, which could make full use of the heterogeneous energy to realize load balance. Simulation...
Multimedia communication networks have a large amount of data to transmit and should have high real-time performance. The requirement of their reliability is different from general computer networks. In this paper a kind of redundant technology based on hierarchical method is proposed. According to the idea of modular design, multimedia communication networks can be considered as two parts: bearing...
In this paper we are proposing an efficient secure solution to the data centric routing protocol One Phase Pull diffusion which permit multi-hop routing of sensed data. SecOPP provides both Group and Pairwise key distribution with the possibility of rekeying as well as security services: integrity, authentication and confidentiality of exchanged messages. All these are obtained without using a key...
Wireless Sensor Networks (WSNs) consist of small nodes with sensing, computation, and wireless communication capabilities. Wireless Sensor Network (WSN) is a promising data mining solution for precision agriculture. Instrumented with wireless sensors, it will become available to monitor the plants for real time, such as air temperature, soil water content, and nutrition stress. This real time information...
Mobile ad hoc networks are becoming an important concept of modern communication technologies and services. It provides some advantages to this communication world such as self-organizing and decentralization. In this paper, we are going to design a cluster-based multi source multicast routing protocol with new cluster head election, path construction and maintenance techniques. The main objective...
Security issues are paramount in wireless networks even more so than in wired networks. A particularly devastating attack in wireless networks is the wormhole attack, where two or more malicious colluding nodes create a higher level virtual tunnel in the network, which is employed to transport packets between the tunnel end points. These tunnels emulate shorter links in the network in which adversary...
In mobile ad hoc networks, the nodes are powered by batteries. So one of the most important merits when evaluating a given protocol is its ability to decrease node energy consumption and prolong network lifetime. Concerning this problem, an improved routing algorithm based on extreme prediction is presented for a mobile ad hoc network. It is an energy-saving and stable routing algorithm in which the...
Ultra-Wide Band (UWB) wireless communication is a promising spread-spectrum technology with features of low cost, low power and high time resolution has potentially important applications in wireless ad hoc networks. This paper presents a novel quality of service (QoS) routing scheme for wireless multimedia ad hoc networks. Besides applying neighbor detection method in route discovery procedure, the...
Quality of Service (QoS) routing is known to be an NP-hard problem in case of two or more additive constraints and several exact algorithms and heuristics have been proposed to address this issue. In this work, we consider a particular two-Constrained Quality of Service Routing Problem where one constraint is superlative and the other is comparative. We consider the superlative constraint to represent...
Delay Tolerant Network (DTN) is evolved from Mobile Adhoc Network, MaNet. It is sparse and intermittently connected mobile adhoc network where reliable communication and end-to-end connectivity is not available for message transmission. The end to end connectivity is not ensured in Delay Tolerant Network. Only high latency applications are used in DTN. Latency may be in hours or days. The store and...
In order to achieve the best performance of a Wireless Sensor Network (WSN), it is a must to provide a challengeable routing algorithm , which consumes less power and allows more data collection. In this paper we have considered a WSN with mobile sinks and it is considered that the router follows the basic location update algorithm with traffic awareness. We show the performances of a router under...
Saving energy and prolonging network lifetime are key problem of wireless sensor networks (WSNS). In this paper, Maximum Lifetime data gathering in WSNS is considered, in which the WSNS is consists of a collection of aggregation trees together with the number of rounds each such tree which is required to be small, given the limited computation and communication resources of sensor nodes. We describe...
This paper presents a new data transmission protocol in Delay Tolerant Mobile Wireless Sensor Networks, which divides the data transmission process into two phases: data reception phase and data forwarding phase, mainly fulfilling through analyzing the state of mobile nodes and using Hand up mechanism. Simulation result shows that, through the implementation of two phases, we can obtain a higher message...
It is worth noting that securing group communication in Wireless Sensor Networks (WSNs) has recently been extensively investigated. Although many works have addressed this problem, they have considered the concept of grouping differently. In this paper, we consider a group as being a set of nodes sensing the same type of data and we alternatively propose an efficient secure group communication scheme...
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