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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...
In these last years the demand for personal and ubiquitous communication has raised at a tremendous rate. Mobile services, which are nowadays typically offered based on location and context, suffer from various 3G shortcomings, and many data providers are looking for innovative solutions offering a carrier-independent, location-based, and cheaper than 3G data distribution. The deployment of a Delay...
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...
Performance of a 60 GHz RoF system employing Single-Carrier signal modulation was evaluated in a typical laboratory environment to understand the impact of channel characteristics. Broadband channel characteristics were measured using a channel sounding technique, and the resulting impact of the characteristics on the performance of the multi-Gb/s RoF system was assessed experimentally. Varying performance...
This paper addresses the issue of supporting time-sensitive multiplayer games in a single hop ad-hoc network. We first propose an analysis of the gameplay experience in such network. To this end, we conducted several experiments of an FPS (First Person Shooter) game over a real ad-hoc network. The poor performances experienced when the number of players reaches a certain value (11, in our scenario)...
Wireless Mesh Networks (WMNs) are primarily viewed as access networks, with traffic flowing in and out of the mesh via gateways. However, in many scenarios, point-to-point (P2P) traffic within the WMN is also important, with the approach used to handle this traffic affecting the performance of not only the P2P flows, but all other traffic as well. This work studies the handling of P2P traffic in the...
Providing Quality of Service (QoS) in wireless ad-hoc networks is an extremely complex task due to issues such as mobility, channel contention, and interference. Over the past years, several algorithms have been presented with the aim of providing QoS support in these environments; specifically, a lot of work has been done in the creation of a reliable admission control mechanism since it has been...
In the context of mobile multi-hop ad hoc networks (MANETs), the routing is still a serious problem. In this work, we utilize the network cartography in different ways in order to improve the efficiency of the routing function. Firstly, we conceive a novel cartography gathering scheme that improves the responsiveness of the routing function towards the ceaselessly evolving topology of the MANET. Secondly,...
Resilience is the ability of a network to provide acceptable service in the presence of challenges to normal operations. With increasing significance of resilience in modern communications infrastructure and services, there is a need for rigorous quantitative evaluation of resilience. In this paper, we present a framework to quantify resilience between any two layers in the network stack. Resilience...
In delay tolerant networks (DTNs), the lack of continuous connectivity, network partitioning, and long delays make design of network protocols very challenging. Previous DTN research mainly focuses on routing and information propagation. However, with large number of wireless devices' participation, how to maintain efficient and dynamic topology of the DTN becomes crucial. In this paper, we study...
This paper presents a conceptual framework of mobility-aware cooperative caching for minimizing electronic content provisioning cost in Mobile Social Wireless Networks (MSWNET). The MSWNETs are formed by wireless mobile devices sharing common interests in electronic content, and physically gathering in various public settings such as University campuses, work places, malls, and airports. Cooperative...
Vehicular Delay-Tolerant Network (VDTN) is a new opportunistic network approach where vehicles act as the communication infrastructure, furnishing low-cost asynchronous communications, variable delays, and bandwidth limitations. At the edge of the VDTNs, terminal nodes assume the gateway function with other networks, such as the common TPC/IP. In VDTNs, IP packets (datagrams) are aggregated in large...
In wireless sensor networks (WSNs), the energy and function of sensor nodes are limited. Congestion occurs frequently in many to one and multi-hop transferring nodes. It can cause packets dropout, low energy efficiency, and long delay. The network congestion control is a key to improve the QoS of network. Most studies were carried out at the transport layer in congestion detection and rate adjustment...
In Vehicular Ad Hoc Networks (VANET) broadcasting is the key means for dissemination of safety messages. Existing broadcasting schemes, however, result in broadcast storm problem. On the other hand, setting up maximum broadcast range is another critical issue for successful communication. Based on the neighbor vehicle density, we intend to mitigate the broadcast storm problem. We also try to reduce...
Security requirements in sensor systems include resiliency against physical and side-channel attacks, low energy for communication, storage, and computation, and the ability to realize a variety of public-key protocols. Furthermore, primitives and protocols that enable trusted remote operation in terms of data, time, and location are essential to guarantee secure sensing. By integrating physically...
With the development of Ad Hoc Network, the demand of the users becomes more and more than ever before, some business requires the ability not only to communicate, but also to guarantee delay and bandwidth. This paper puts forward a QoS-based multipath routing protocol QMPSR. It takes bandwidth and delay constraint into account, it can find several paths to provide QoS guarantee. Simulation shows...
Mobile Ad-hoc Networks (MANETs) involve the establishment of wireless connections between mobile nodes, and can dynamically extend the coverage area of wireless local area networks (LAN). For MANETs that use a single channel, the communication performance decreases due to interferences between nodes when frames are being relayed. In this paper, we propose a priority control scheme based on neighbor...
Supporting real-time traffic in wireless LANs is one of the interesting QoS issues. However, the wireless ad hoc networks are severely affected by bandwidth, and establishing a QoS in these networks face problems. In this paper, we have proposed a fully distributed MAC algorithm to support the QoS in ad hoc networks. This algorithm provides delay fairness and delay differentiation for real-time flows...
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