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Wireless mesh network addresses the last mile issue; however, RF-based technologies are still a bottleneck for todays' media-rich applications. In this paper, we propose enhancing the capacity of an existing wireless mesh backhaul using free-space optical links. Such a hybrid RF/FSO network is capable of multiplying the available bandwidth for each subscriber if the FSO transceivers are placed at...
Wireless mesh networks play a key role in the overall performance of hybrid wireless optical access networks. In many cases, the wireless multihop network causes a bottleneck and under- utilizes the network resources. In this paper, we propose a new approach to increase the wireless network capacity by enhancing the congested links, normally those which are closer to the gateways, using MIMO antennas...
In recent years, there has been a dramatic increase in the number of users who access online videos from wireless access networks. It is highly desirable that such wireless networks be robust in handling sudden spurts in demand for certain videos due to occurrences like special events. An abrupt increase in network usage should not significantly impact normal access to other regular videos or other...
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...
Using the new wireless capabilities in vehicles, various applications have appeared in Vehicular Ad Hoc Networks (VANETs). Multimedia data sharing is one of such applications, which has recently been given so much attention. Most presented schemes in this field are focused on direct opportunistic meetings between vehicles or request/response broadcast in the whole network, which are inefficient and...
In this paper, we present SAGA, a system for building energy management that provides robust multi-hop wireless sensing, actuation, device management, plotting of historical data and a server backend API to support remote access. Information collected from sensor nodes is stored locally for quick retrieval even if outside network connectivity is lost or unavailable. When network connectivity is available,...
Delivery of high-quality streaming services over multi-hop wireless mesh networks (WMNs) is a challenging research problem because of quality fluctuation and interference of wireless links in WMNs, as well as strict throughput, delay, and reliability requirements of streaming applications. In this paper, we propose a Network Assisted Peer-to-Peer (NAP2P) system for file-based media streaming services...
In this paper, we elaborate a set of scenarios and experiments for evaluating the impact of the physical environment on a Wireless Sensor Network (WSN). More specifically, a WSN application is implemented for collecting received signal strength indicator (RSSI) measurements in two different environments. The main contributions are twofold: boxplot diagrams are used for graphical comparison of RSSI...
Today's access networks are increasingly shaped by the services that they provide to the end users. In a hybrid wireless-optical broadband access network (WOBAN), to access any service, the corresponding requests for the services and responses require multi-hop communication over the wireless mesh network (WMN) and Passive Optical Network (PON) subsequently over the Internet to some server in the...
This paper explores the performance benefits of an information-centric network which capitalizes on overlapping multiaccess for content distribution. We present our architecture which uses an enhanced BitTorrent protocol, supports multiple network accesses simultaneously, and localizes information retrieval. We employ simulation to show the gains, on one hand, in individual node performance and, and...
With the advancement of Internet technologies and the widespread use of mobile devices, the number of users in conferencing services is increasing quickly. A P2PSIP conferencing system and an IP Multimedia Subsystem (IMS) conferencing system have been designed to provide conferencing services. The IMS conferencing system was developed to adapt to a server-based centralized system, while the P2P network,...
Fiber-wireless (FiWi) access mesh networks have been proposed as flexible and cost-effective solutions for future access networks. However, for FiWi access mesh networks to provide end-to-end QoS guarantees to its customers, efficient QoS routing schemes and scheduling policies become necessary. Here we provide a model, using repeated game theory, that creates ground for scheduling policies to be...
This work discusses the adaptation of group-oriented messaging and chat technology for operation in serverless, multicast-capable mobile wireless architectures. The main goals are to allow group messaging and chat sessions to fragment/coalesce, operate through disrupted TCP conditions, and improve bandwidth utilization when multicast is available. In addition, the solution demonstrates proxying and...
Wireless mesh networks usually deploy multiple gateways to enhance the capacity. This paper studies how to maintain forwarding paths in 802.11s wireless mesh network. A Multi-Gateway Multipath routing protocol (MGMP) is proposed to explore path diversity. MGMP constructs multiple paths between source and destination using a proactive tree architecture as HWMP. In order to make MGMP more efficient,...
In the recent years, there is a growing interest in the design and deployment of sensor systems for applications of high-level inference, which leads to an increasing demand on connecting Internet Protocol (IP) network users to wireless sensor networks and accessing the available services and applications. In this paper, To overcome the shortcomings of existing P2P-based integrating architecture for...
Service discovery (SD) protocols in Wireless Sensor Networks (WSNs) enable the sensor nodes to locate services offered by other nodes in the same or any other network and invoke the services. But it is a crucial task for sensors to perform timely service discovery in a pervasive environment. Also ongoing research in this field is limited with only few SD protocols proposed for some specific use cases...
Due to the energy-constrained nature of wireless sensor networks (WSNs), a variety of communication protocols which rely on cluster-based topologies to enhance network capacity or to prolong network operational lifetime have been well studied heretofore. In this paper, we instead study a comprehensive perspective that searches for an optimal operation that considers backbone node placement and communication...
We consider a huge hierarchical sensor network consisting of millions of sensors arranged in clusters for scalability and cost-performance. We address the problem of how a centralized gateway can estimate the number of sensors affected by a certain event. We propose a scheme for solving this problem in the most efficient way in terms of communication cost, and a complete mathematical analysis of the...
The use of multihop wireless networks based on the 802.11 technology has been growing. The primary advantages of this approach are mature technology and ease of deployment. However, the fairness property provided by the 802.11 DCF (distributed coordination function) in a single hop environment has been shown to be non-existent in a multihop environment. For example, in the multihop wireless backhaul...
Cities around the world have planned and implemented large-scale wireless mesh network deployments. These mesh deployments are expected to provide broadband mobile access to the Internet at a low-cost to the user. This paper considers the fairness problem for nodes in multihop wireless mesh networks. Many existing approaches are unsuitable because they require modifications to the IEEE 802.11 MAC...
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