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This article introduces a sensor information networking architecture, called SINA, that facilitates querying, monitoring, and tasking of sensor networks. SINA plays the role of a middleware that abstracts a network of sensor nodes as a collection of massively distributed objects. The SINA's execution environment provides a set of configuration and(More)
— In mobile wireless ad hoc networking environments , such as the Future Combat System (FCS), the shared wireless communication medium is an inherently limited resource and is collision prone. In this paper, we propose to adapt the Dual Busy Tone Multiple Access (DBTMA) protocol for use with directional antennas, which further increases effective channel(More)
The advent of technology has facilitated the development of networked systems of extremely small, low power devices that combine programmable general purpose computing with multiple sensing and wireless communication capability. This networked system of pro-grammable sensor nodes, together form a sensor network , poses unique challenges on how information(More)
—The topology of an ad hoc network has a significant impact on its performance in that a dense topology may induce high interference and low capacity, while a sparse topology is vulnerable to link failure and network partitioning. Topology control aims to maintain a topology that optimizes network performance while minimizing energy consumption. Existing(More)
With the advancement of hardware technology, it becomes feasible to develop a networked system of pervasive computing platforms that combine programmable general purpose computers with multiple sensing and wireless communication capability. This networked system of programmable sensor nodes, together called a sensor network, poses unique challenges on how(More)
—Ad hoc networks, where mobile nodes communicate via multihop wireless links, facilitate network con-nectivity without the aid of any pre-existing networking infrastructure. The intrinsic attributes of ad hoc networks, such as dynamic network topology, limited battery supply, constrained wireless bandwidth and quality, and large number of heterogeneous(More)
— Energy drainage from a node is mainly caused by the power consumption of the node's communication device. A MAC protocol is the main mechanism to provide efficient access to the shared wireless channel. Directional antennas provide several benefits over omnidirectional ones including the reduced energy consumption in frame transmissions. In this paper, we(More)
— Topology control for ad hoc networks aims to increase effective network capacity and conserve energy. Most proposed algorithms assume the usage of isotropic antennas and thus only adjust the transmission power of each node. We propose a distributed topology control mechanism for ad hoc networks with directional antennas that adjusts antenna pattern(More)