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Disaster information network is very important for people in many countries, particularly in Japan because there are many serious disasters have occurred annually. So far we have developed a disaster information network based on wireless LANs because of their mobility, portability and easy installation. In order to improve the connectivity and to attain the longer communication distance, we introduce...
Considering the constraints brought by mobility and resources, it is important for routing protocols to efficiently deliver data in intermittently connected mobile networks. Different from previous works that use the knowledge of previous encounters to predict future contacts, we propose a storage-friendly region-based protocol, i.e., RENA, in this paper. Instead of using temporal information, RENA...
Networked devices are often equipped with multiple interfaces. Legacy routing and transport protocols only support the transport of data over a single interface resp. paths. This tutorial discusses extensions for IP and TCP in order to support multiple interfaces. Multihoming and mobility management allow the simultaneous usage of interfaces by independent application data flows, while multipath transport...
The conventional Mobile Ad-hoc Network (MANET) is composed of mobile nodes without any infrastructure. But, emergent traffic such as disaster positioning by using wireless infrastructure is indeed required. Therefore, network deployment for ad-hoc would associate WiMax with WiFi which is called 802.16e MANET Environment in this paper. Based on the 802.16e MANET environment, we propose a novel Hierarchical...
The main reason for packet loss in Wireless Mesh Networks (WMNs) is due to congestion. Presently, routing in WMNs is not congestion-adaptive. Routing may let a congestion happen which is detected by congestion control. The way in which the congestion is handled results in longer delay and more packet loss and requires significant overhead if a new route is needed. Hence, we propose a congestion adaptive...
Intermittent connectivity is common in certain wireless access networks. Existing network protocols are not resilient to disruption of communication links and communication often fails when faced with sporadic connectivity. Thus in recent years there is a growing interest in Intermittently Connected Mobile Networks (also know as Mobile Opportunistic Networks) and many routing protocols have been proposed...
This paper presents a communication framework for end-to-end seamless connections and TCP performance improvement in the IEEE802.il wireless home network platform exploiting dual wireless modes, infrastructure and ad hoc modes. While many ad hoc routing protocols for end-to-end seamless connections and cross-layer techniques available in the literature have been proposed at the level of protocol design...
The wide availability of WiFi hot-spots provides mobile users with convenient access to the Internet. However, hot-spots cover only small areas and are often operated by a local authority. A user that roams between hot-spots effectively traverses different operators and access networks. Due to deployment complexity, IP mobility is usually not supported by the mobile node or the network. In this paper...
Ad hoc wireless networks consist of a number of nodes roaming freely, interconnecting with each other by wireless connection without relying on a predefined infrastructure. When comparing ad hoc wireless networks with fixed networks or infrastructure wireless networks, ad hoc wireless networks base on the nodes that work as host and as router. In this paper, we present a new routing protocol for an...
This paper describes a field demonstration and presents the network performance of an 802.11 ground-UAV network composed of 11 ground stations, a mobile vehicle and two fixed wing UAVs, connected by two routing gateways to a legacy wired network. The network effects demonstrated include mobility, network partitions and merges, and gateway failovers. The paper presents experimental results for recorded...
Fourth Generation (4G) mobile communications should not only focus on data rate increase and novel air interface, 4G mobile should converge the advanced wireless communications and high-speed wireless access. Considering the performance and cost, our research is now focusing on WLAN access. In order to study the 4G mobile handsets and other parts, we need a platform. Because no device provider could...
Wireless LANs are very useful as disaster information networks because of their mobility, portability and easy installation. However, in the actual disaster case, electric power line is also damaged and those wireless LANs cannot be functioned. In this paper, we introduce a power saving cognitive wireless LANs for disaster use with combination of solar panel, wind turbine and battery, so that, the...
The co-existence and integration of different wireless networks will significantly advance the provision of ubiquitous and high-performance Internet services to mobile users. In this paper, we present HAWK, a real-world implementation of high performance heterogeneous wireless networks for ubiquitous Internet access. We have built a fully featured testbed comprised of different wireless networks,...
The major area of interest in networking is to connect the user of mobile devices to the Internet. These mobile devices are connected to the foreign networks in the Internet will expect or requires the same functionality when they are connected to the home network. The ad hoc networks provide connectivity between the mobile hosts and access points without backbone infrastructure. The network mobility...
After the great deployment and success of the Wireless Local Area Networks based on access points, which communicate by using wired links, the wireless world saw the birth of new technologies like Ad Hoc networks and Wireless Mesh Networks (WMN), which permit the flexibility, easy deployment and low cost. The first objective of these networks is to offer a seamless connectivity to mobile users. Nevertheless,...
IEEE 802.11 proposed a number of standards and each one had a specific goal. They can be configured in infrastructure mode or ad hoc mode. In the study of infrastructure mode, the focus was on 802.11 b/g co-existence along with other single mode operations to analyze the throughput and traffic drop through simulation. In the study of ad hoc mode, the focus was to analyze the behavior of ad hoc networks...
The next generation mobile communication systems will be based on Infrastructure wireless LAN technologies like cellular and ad hoc networks. Such hybrid networks benefit the extension of infrastructure network coverage using Ad Hoc connectivity apart from offering the ad hoc nodes access to the resources of the Wired/Infrastructure networks. In most of the integration strategies Mobile IP is integrated...
This paper presents a communication framework for cross-layer design to improve network performance in the wireless networks. The proposed communication framework consists of the following two things. First, we propose the XCP (eXtensible Cross-layer design Platform) that enables the exchange of information between different layers for performance optimization. Second, the CAR (Cross-layer approach...
Recent advances in Wireless Mesh Networks (WMNs) have overcome the drawbacks of traditional wired networks and wireless ad hoc networks. WMNs are going to play a highly promising role in the next generation of networks. Mobility management is one of the most significant management services for WMNs. Due to the inherent characteristics of WMNs, such as relatively static backbones and highly mobile...
Most of current user mobile devices incorporate a WiFi interface. Peer communications are based on Ad-hoc network configuration, but the main handicap is the radio coverage. The success in deploying services and applications based on this concept needs the development of relay protocols and applications that allows intermediate users the reception and forwarding of information to destination users...
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