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The collection of wireless mobile nodes is called Mobile Ad-Hoc Network (MANET) that makes a momentary network not using any centralized access points or centralized administration. For an efficient network formation, mobile nodes should be capable enough to utilize the available query resources. This can be achieved using process of queue scheduling. Scheduling is a way by which multiple threads...
To cater for different conditions of QoS application, this paper proposes an adaptive cross-layer QoS model for mobile Ad Hoc networks according to their characteristics. Based on the traditional TCP/IP protocol stack, the cross-layer information exchange module and the adaptive decision-making module are added. The cross-layer information exchange module breaks the restriction of the original layer...
The convergence of services and technologies has been driven by service and network providers with the aim to develop a unified infrastructure. From the services side, we have multimedia through unicast, multicast and broadcast services. From the technologies side, we have wired and wireless technologies, including unidirectional technologies such as Digital Video Broadcasting (DVB). These trends...
This paper introduces P2P communication across a VANET and seeks to establish under what conditions (mobility, network size, wireless channel) data streaming is feasible. Routing of streamed services over multiple hops and multiple paths may result in significant packet losses, resulting in unacceptable quality of service. This paper examines the impact of differing traffic densities and different...
The present work focuses on emulation and validation of protocol stacks for MANETs (mobile ad-hoc networks) that must support multimedia applications in a tactical environment. We considered a network consisting of some tens of mobile nodes, with randomly variable speeds in the order of some tens of km/h. Nodes are deployed on a scenario of a few km2 and have a radio range of some hundreds of meters...
An innovative and scalable routing scheme for mobile ad-hoc networks (MANETs) is proposed, taking into account aspects such as quality of service (QoS) and resiliency. These issues are tackled by using a robust routing scheme in conjunction with a dynamic cell deferred routing strategy. This approach consists in dividing the network into cells which maintain different and sufficient topology views,...
A flat mobile ad hoc network has an inherent scalability limitation in terms of achievable network capacity. It is seen that when the network size increases, per node throughput of an ad hoc network rapidly decreases. This is due to the fact that in large scale networks, flat structure of networks results in long hop paths which are prone to breaks. These long hop paths can be avoided by using virtual...
To minimize the large handover delays associated with mobile IPv6 numerous micro-mobility protocols were proposed. In this paper, we consider the mobility agent (MA) based family of micro-mobility protocols such as hierarchical mobile IPv6 and proxy mobile IPv6 and focus on the issue of the bottlenecks that MAs can lead up to under high network load. We propose a Dynamic QoS aware route optimization...
Mobile Ad Hoc networks is a multi-hop temporary autonomous networks, completely consisting of mobile nodes. In such networks, traditional routing protocol cannot effectively function. Considering the characteristics of mobile Ad Hoc networks, QRULA which can support QoS controlled routing is given to satisfy the demands of Ad Hoc networks with unidirectional Links. This protocol fully considers the...
The task of finding and sustaining routes in mobile ad-hoc networks (MANETS) is an important factor in determining the efficiency of any MANET protocol. MANET characteristically comprises of wireless mobile hosts whose communication with each other is devoid of any fixed infrastructure. Absence of fixed infrastructures and host mobility thus constitute frequent unpredictable topological views. Positional...
Unlike fixed networks such as the Internet, quality of service support in mobile ad hoc networks (MANETs) is challenging. They potentially have less resources than fixed networks. Applications like video-on-demand, video conferencing, demand multicasting in MANETs. For such applications, more criterion are required in order to capture the quality of the links between the nodes. Proposed QoS aware...
The joint tactical radio system (JTRS) program is developing a set of mobile ad-hoc networking (MANET) waveforms, to provide the last tactical mile connectivity to the global information grid (GIG). JTRS networking services provide an Internet protocol (IP) networking stack and networking services that operate at open systems interconnection (OSI) layer 3 and below. Developers program the networking...
Although several congestion aware routing protocols have been proposed for mobile ad-hoc networks (MANETs) over the last decade, the effect of the different traffic types has not been considered in any routing protocol. Distinguishing different types of traffic that each node deals with in QoS-aware MANETs and responding to routing protocol requests correspondingly can potentially increase the performance...
Mobility aware applications have been proposed several times in the past in order to compensate for the weakness of the standard IP model in a mobile environment. Such applications are aware of the network conditions and are able to adapt themselves to such variable conditions. They can even get involved into flow routing and interface management. The solutions proposed by literature are mainly related...
The presence of delay-sensitive traffic in QoS-aware MANETs (mobile ad-hoc networks) results into increased TCP spurious timeouts, thus wasting their scarce bandwidth. Furthermore, the different dynamics used by a routing protocol in discovering and maintaining routes have a significant impact on TCP and MANETs in general. In this paper, we investigate the combined effect of contention- induced spurious...
With the increase of multimedia traffic over the past few years and traffic differentiation introduced by IEEE 802.11e, nodes with delay-sensitive multimedia traffic tend to be busy for long periods, thus exacerbating the congestion problem in mobile ad hoc networks (MANETs). Although most of the existing routing protocols are based on the shortest path algorithm, some other metrics like load and...
We address the problem of identifying misbehaving nodes that (selectively) drop packets, in order to degrade the network performance. Such nodes may agree to forward packets by participating in the route discovery process, but refuse to do so once the packets have been received. We propose a reactive approach where the source initiates an audit process if a significant performance degradation is observed...
The need for supporting real time and multimedia applications for users of mobile ad hoc network (MANET) is becoming essential. Mobile ad hoc networks can provide multimedia users with mobility they demand, if efficient QoS multicast strategies were developed. The aim of this article is to define the building blocks of such an ad hoc QoS multicasting (AQM) protocol and propose a cross layer framework...
A principal factor in sensor network design is energy efficiency. In this work, we propose to extend the lifetime of sensor networks using appropriate choice of sensor node distribution. The key idea of our scheme is to deploy more nodes in areas of extensive energy usage. Using this scheme of sensor node distribution, we use probabilistic angular routing to route data packets from the sensor nodes...
This paper proposes a fast forward medium access control protocol (FFMAC) for quality-of-service (QoS) guarantee in multihop IEEE 802.11s wireless mesh networks with multiple channels. To the best of our knowledge, the proposed protocol is the first one which considers the multihop and multichannel issues simultaneously. It provides higher priority for real-time applications, while remaining the distributed...
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