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In tactical networks, nodes move according to tactical maneuvers and network partitions occur frequently. To mitigate this problem, data replication is commonly used to increase data availability and reduce data access delay. However, different tactical maneuvers lead to different node mobility models, which affect the performance of data replication schemes. In this paper, we comprehensively study...
In this paper, we address a important and still unanswered question in mobile cloud computing "how mobility impacts the distributed processing power of network and computing clouds formed from mobile ad-hoc networks ?". Indeed, mobile ad-hoc networks potentially offer an aggregate cloud of resources delivering collectively processing, storage and networking resources. We demonstrate that...
This research aims to improve the quality of MPEG-4 video transmission over MANET using cross layer paradigm that transfer the MPEG-4 video priority information from application to medium access control (MAC) layer. This information is used by proposed adopting dynamic mapping algorithm (ADMA) along with other information as access category (AC) congestion from MAC and hop count to destination from...
In this work, we carry out a comparison evaluation for mobile and static sensor nodes in Wireless Sensor Networks (WSNs) using TwoRayGround propagation model and different protocols. We consider packet-loss and delay metrics to evaluate the performance of WSN. The simulation results have shown that for WSN with mobile sensor nodes, the delay is better than static sensor nodes. In case of static sensor...
New generation of mobile wireless networks utilizes IP mobility protocols to handle handovers between their different subnets. Among existing options, Proxy Mobile IPv6 (PMIPv6) as a network-based protocol presents higher handover performance comparing with its client-based counterparts such as Mobile IPv6 (MIPv6) and Hierarchical Mobile IPv6 (HMIPv6). Nevertheless, the PMIPv6's operation is limited...
Because of the popularity of smart mobile devices with the capabilities to capture location information by using global positioning system (GPS), numerous novel geographical applications and services have been introduced. Among these applications, geocast service has recently gained a lot of attractions, since it has great potential to achieve multicast-like geo-applications such as location-based...
To meet the continuously increasing demands and requirements of mobile users, next generation wireless systems are more and more relaying on the coexistence of heterogeneous wireless networks. The objective is to provide any time and anywhere connectivity to users. One of the main challenges in such a heterogeneous environment is mobility management, including network selection and Vertical Handover...
Mobile ad hoc network especially follows multihopping mechanism for routing to make a path from source to destination. If we have a sound and solid routing path that would be efficient, reliable and adaptable to the different scenarios of network too by following the next hop mechanism and also should be the farthest node with in the cluster then we could achieve better performance by the network...
Mobile Ad-hoc Networks (MANETs) exhibit unpredictable topology with heterogeneous node contact rates, high mobility and limited information. When dealing with such challenging environments, the mobility model has a key role in testing the performance and proving the expected behavior of routing algorithms. While synthetic mobility models have been largely used to measure quantitative aspects of routing...
Nowadays, a new paradigm is emerging: the challenging integration of Peer-to-Peer into mobile Ad hoc networks (MANETs). In this context, this paper proposes a new distributed lookup protocol for mobile P2P networks. Its main objective is to reduce the overhead traffic and the lookup delay. Simulation results indicate that the proposed scheme has an improved performance in comparison with the popularly...
Social networking in the present mobile dominion proffers a congruity to challenged networks during periods of scarce resources for communication. The following paper explores this characteristic to implement social networking as a Delay Tolerant system with DTN-based content storage and retrieval. The following paper explores this opportunistic behavior of mobile networks and describes a parallel...
Delay tolerant networks are intermittently connected. In this paper, we propose a DTN routing scheme EBR. The scheme is based on the idea of exploiting inter-contact time between mobile nodes to predict the number of nodes with no copy a node will encounter within the expected delay. In EBR, every node with message copies dynamically chooses the number of copies by itself. We evaluate the performance...
File sharing applications in mobile ad hoc networks (MANETs) have attracted more and more attention in recent years. The efficiency of file querying suffers from the distinctive properties of MANETs including node mobility and limited communication range and resource. An intuitive method to alleviate this problem is to create file replicas in the network. However, despite the efforts on file replication,...
An ad hoc network is an infrastructure less network which means it does not require any base station for the data transmission. The performance of these networks is impacted by the topology of the network where the mobility pattern and the number of nodes are the important metrics. This paper is intended to measure the throughput of the network as the density of nodes increases. We simulated the AODV...
Mobile ad hoc networks (MANETs) are becoming more essential to wireless communications due to growing popularity of mobile devices. The integration of mobile ad hoc devices inside vehicles has led to another type of networks, called Vehicular Ad hoc Networks (VANETs) which are also becoming important. These networks require specialized routing protocols due to their ad hoc nature. The performance...
High mobility of nodes is an important challenge of vehicular ad hoc networks (VANETs). Contention based forwarding protocols have well congruity with high mobility of nodes in VANET. These protocols need neither already existed route nor information about neighbors of current forwarder. But these select next hop in distributed manner using Dynamic Forwarding Delay (DFD) that is a kind of timer. In...
The technological advancement in the area of wireless networking is ultimately envisioned to reach complete and seamless ubiquity, where virtually every point on earth will need to be covered by Internet access. Low connectivity environments have emerged as a major challenge, and accordingly Opportunistic Networks arose as a promising solution. While these networks do not assume the existence of a...
3G networks are currently facing severe traffic overload problems caused by excessive demands of mobile users. Offloading part of the 3G traffic through other forms of networks, such as Delay Tolerant Networks (DTNs), WiFi hotspots, and Femtocells, is a promising solution. However, since these networks can only provide intermittent and opportunistic connectivity to mobile users, utilizing them for...
It is challenging to react to dynamically changing of network topology for routing schemes in Delay Tolerant Networks (DTNs). The main concern about routing in DTNs is to minimize delivery delay while maintaining low overhead. In this paper, we propose a DTN routing scheme Density-Aware Message Spraying (DAMS). The scheme is based on the idea of exploiting spatial node distribution and encounter history...
Wireless sensor networks are designed to be used in any situation that requires monitoring of widely-dispersed geographic areas. They are capable of providing automated monitoring with high precision at low cost over long periods of time. In order to achieve the conflicting goals of high precision at low cost, software techniques can be employed to enhance the precision of important metrics. In particular,...
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