Yanchao Niu

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In the future, TCP/IPv6 may be the viable protocol family for sensor networks. IETF has already built 6LoWPAN working group whose goal was to transmit the IPv6 packets over IEEE 802.15.4 specifications. We build a testbed supporting the IEEE 802.15.4 standard to validate the Internet draft "Transmission of IPv6 Packets over IEEE 802.15.4 WPAN Networks". It(More)
In wireless sensor networks (WSNs), location information plays an important role in many fundamental services which includes geographic routing, target tracking, location-based coverage, topology control, and others. One promising approach in sensor network localization is the determination of location based on hop counts. A critical priori of this approach(More)
Energy efficiency in wireless sensor networks is one of the most crucial technologies. In this paper, we propose a simple and feasible synchronous sleep and wake mechanisms for wireless sensor networks in a small scale. Sensor nodes are divided into forwarding nodes and listening nodes. Beacon frame containing sleep command from coordinator can be forwarded(More)
Mobile sensor network(MSN) is a kind of wireless sensor networks(WSNs) in which nodes can move under their own control or under the control of the environment. In this paper we develop a new mobile sensor node that supports IPv6 technology, which enablesWSN to easily connect to Internet. Furthermore, we propose a dynamic path planing for mobile node's(More)
This article analyzes the hop-distance relationship in a shadow fading environment. Assuming the sensor nodes are randomly deployed in a circular region according to a planar Poisson process, we present the close relationship between the hop counts and their geographic distance. An improved localization algorithm based on the hop-distance relationship,(More)
This paper presents an analytical method to evaluate the hop-distance relationship for quasi-UDG (Unit Disk Graph) model in wireless sensor network, where sensor nodes are randomly and independently deployed in a circular region by a Poisson process. Different from the UDG model, quasi-UDG model has the non-uniformity property for connectivity. We derive an(More)
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