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Spatially unbalanced energy consumption among sensors is the most important issue in Wireless Sensor Networks (WSNs). This uneven energy consumption can significantly reduce network lifetime. The use of sink mobility with constrained paths and decreasing the message flood by limiting the flood area can help to improve the energy efficiency in WSNs. Maximum Amount Shortest Path routing (MASP) is an...
Node mobility plays an important role in the routing performance for MANETs. Many protocols provide parameters to adapt to different levels of mobility, but this is a global optimization (i.e., typically all nodes choose the same parameter values and they use these parameters throughout their participation in a MANET). We choose the monitored number of link breaks as key mobility metric and observe...
Wireless links in a Mobile Ad Hoc Network (MANET) is unreliable. So the links in between the nodes in a MANET breaks frequently. Mobility of nodes in a MANET increases the level of unreliability of the link between the nodes. Failure of a link also leads to complete route failure and affect the performance of MANET. So, there is a need to study the effect of mobility of nodes that causes a link break...
To guarantee the required quality of service and quality of experience in Internet Protocol Television (IPTV), the server must have the required capacity and resources to serve all the clients' requests. One of the most important resources is the bandwidth. The flexibility of IPTV services which provide users to stream multimedia contents at anytime and anywhere they want makes the demand for video-on-demand...
Mobile ad hoc networks (MANET) are collections of self-organizing mobile nodes with dynamic topologies and have no fixed infrastructure. MANET do not have centralized administration, here nodes act as both host as well as router and communicate by forwarding packets for each other in multi hop way, because of the fundamental characteristics like, the open medium, dynamic network topology, lack of...
In this paper, a dynamic shortest path weighted routing mechanism applying to mobile ad hoc networks is proposed based on the complex network theory. This weight routing mechanism uses node energy and link distance which are the two most important factors affecting the performance of mobile ad hoc networks to structure the weights of edges. The routing process presented by this paper uses a mixed...
Bandwidth is one of the characteristics that is used to measure network performance. In this paper, we present a Unicast Bandwidth Efficiency Routing Algorithm (UBERA) for mobile devices that are streaming video contents from a video server. The algorithm can adapt to different number of mobile devices with different level of mobility and different location. Routing decisions are based on the availability...
There is an increasing interest in Mobile Ad hoc Networks (MANETs) for their potential use in several fields such as collaborative computing, tactical networks and multimedia communications. Thus, MANETs need to support multiple communication flows in the network, while guaranteeing a good performance. In this paper, we analyze the performance of a MANET by simulations, considering multiple flows...
As Mobile Ad hoc Networks (MANETs) are attracting attention for their potential use in several fields such as collaborative computing and multimedia communications, there is an increasing need to minimize the overhead introduced by routing protocols in the network. In this paper, we analyze the performance of a MANET by simulations, in terms of RREQ, RREP and RERR, considering Random Waypoint Mobility...
A MANET is an autonomous group of mobile users that communicate over reasonably slow wireless links. The network topology may vary rapidly and unpredictably over time, because the nodes are mobile. Routing is a significant issue and challenge in ad hoc networks and many routing protocols have been proposed like OLSR, AODV, AOMDV, DSDV, DSR, ZRP, GZRP and TORA, LAR so far to improve the routing performance...
MANETs are temporary networks, that spend less time to be deployed and less resources to keep up and running. MANETs can be implemented in disaster recovery sites, university campuses, military campaigns and so on. MANET nodes cooperate in an autonomous way by forwarding packets to each-other. Considering mobility of the terminals, the routes change dynamically so routing algorithms are very important...
In recent years, Optimized Link State Routing (OLSR) protocol receives widespread attention due to its relatively less routing overheads and good routing performance. Since the mobility of nodes and flexibility of the topology are the principal features of ad hoc network, it is necessary to study the impact of these features on the performance of the network. In this paper, we propose a novel scheme...
In this paper, we investigated the performance of some routing protocols for Ad-Hoc Networks under CBR and TCP traffic source. The behaviors of TCP still have not well understood in the multi-hop wireless networks. Through this paper we are able to find that how TCP will react under different network conditions. In this traffic and mobility scenarios play an important role in evaluating the performance...
Wireless networks have become increasingly popular. They can provide mobile users with ubiquitous communication capability and information access regardless of locations. In this paper, we evaluate the heterogeneous environments of wireless mobile ad-hoc networks by simulations. For simulations, we used ns-3 network simulator considering Ad hoc On demand Distance Vector (AODV) and Optimized Link State...
Simulation of Vehicular Ad hoc Networks(VANETs) is an important aspect of the analysis and design of intelligent routing and broadcasting protocols. In VANETs, the topology of the network changes very often, therefore implementation of efficient routing protocols is very important problem. The communication between vehicles is used for safety, comfort and for entertainment as well. The performance...
Topology change is the main factor that affects the network life time of Wireless Sensor Network (WSN) applications. In static WSN, the topology change is often caused by node failure which is due to energy depletion. However, in the Mobile WSN (MWSN), the main reason of the topology change is caused by the node movement. Since the mobile sensor nodes are limited in power supply and have a low radio...
The present work is dedicated to study attacks and contremusure in MANET. After a short introduction to what MANETs are and network security we present a survey of various attacks in MANETs pertaining to fail routing protocols. We also present the different tools used by these attacks and the mechanisms used by the secured routing protocols to counter them. Our work ends with a proposal analytical...
MANETs are vulnerable to a number of security threats due to their flexible characteristics such as dynamic topology formation, openness of the wireless medium and resource constraints. Wormhole attack is one of the most sophisticated forms of security threats in MANET wherein two or more colluders silently record packets at one location and then tunnel them to another location in the network. As...
Misbehaving nodes, including malicious and selfish ones, will disturb the cooperation among all wireless nodes in a mobile ad hoc network (MANET). Overhearing and reputation based cooperation schemes have been used to detect and isolate the misbehaving nodes as well as to force them to cooperate. These schemes worked well in previous publications. However, in this paper, we propose an on/off misbehaving...
DYMO as a routing protocol is newly intended for use by mobile nodes in wireless multihop network. It offers adaptation to changing network topology and determines unicast routes between nodes within the network on-demand. It is designed for MANET (Mobile Ad hoc Network) in small, medium, and large node populations. It handles all mobility ranges and various traffic patterns. It is simulated using...
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