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A wireless sensor network is a group of devices that uses radio to monitoring and sensing physical or environmental conditions at different location. Commonly monitored parameters are pressure, temperature, humidity, wind direction and speed, sound intensity, power-line voltage, and chemical concentrations. However, Energy efficiency is an essential design issue is a challenging task. In this simulation...
Due to major differences with respect to its counterpart in infrastructure networks, the handoff problem in ad hoc networks needs to be treated through an integrated multi-layer approach. In this paper, an integrated framework through cross layer approach is presented to deal with the handoff problem in heterogeneous wireless networks with multiple interfaces. Further, extensive study has been conducted...
The envisioned airborne networks (ANs) will be all IP-based to provide seamless connectivity and reachability among diverse aircrafts and unmanned air vehicles. Due to the dynamic nature and bandwidth/capacity limited channel condition of airborne networks, providing dynamic yet efficient network service always faces many challenges. In this paper, we summarize our efforts on design and implementation...
The congestion problem in wireless sensor networks (WSNs) is quite different from that in traditional networks. Most current congestion control algorithms try to alleviate the congestion by reducing the rate at which the source nodes inject packets into the network. However, this traffic control scheme always decreases the throughput so as to violate fidelity level required by the application. In...
We assume that sensors are aware of the positions of neighbors within a specific knowledge range, which is smaller than their maximum transmission range. We propose the GRoVar protocol (geographic routing with variable transmission range) that extends the well-known GFG protocol , a combination of greedy forwarding and recovery, by applying variable transmission range and bea-conless routing techniques...
The scalability of routing and resource advertisement protocols is a key issue in large optical networks. A commonly used solution is based on the hierarchical approach adopted in IP/MPLS-TE networks, i.e., multiple areas or autonomous systems are pre-established to contain the geographical scope of the resource advertisement protocols and the related routing information. With arbitrarily pre-established...
Real-time services such as VoIP and multimedia streaming are affected during a mobile's rapid handoff due to the associated delay resulting from associated handoff operations of discovery, detection, configuration, registration, media redirection, and processing at different network nodes. Redundant communication path of any signaling and media adds to the delay during session setup and media delivery...
We present an integrated architecture for seamless soft handoff in mobile ad hoc networks, where various managers residing on multiple layers are proposed to tackle handoff issues in a cross-layer and cooperative manner. At the link adaptation layer, the virtual interface provides link transparency to the upper layers and session management is handled at the interface manager. At the network layer,...
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