Browsing by Author "Zhang, Weiqi"

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    Exploring an IPv6 protocol for mobile sensor network communication
    (University of New Brunswick, 2013) Zhang, Weiqi; Nickerson, Bradford
    This research explores IPv6 in mobile wireless sensor networks (WSNs). An indoor WSN mobile sensor network testbed of length 24 m was built and used for mobile WSN testing. The test network enabled the use of one or two moving nodes and six stationary nodes. TelosB sensor nodes were used for testing. The thesis presents a detailed explaination of sending and receiving User Datagram Protocol (UDP) packets using the IPv6 Low Power Wireless Area Network (6LoWPAN) software stack in the Berkeley Low power Internet Protocol (BLIP) implementation of Tiny0S 2.1.1 and 2.1.2. A Java based Web application called WSNWeb was built that displays real-time route topology changes and sensor data. The data is updated in a log file, and used to compute packet loss and determine the number of route topology changes. We created 35 test cases, 15 with two moving nodes, and 20 with one moving node. On a test track, model train velocities between 0.076 m/s and 0.376 m/s were used, with three different routing table update periods (RTUPs) of 60 s, 6 s, and 0.6 s. The results show that the one moving node 0.6 seconds RTUP has significantly higher packet loss (up to 1.4% compared to 0.16%) over a five hour test compared to RTUPs of 60 s and 6 s. The two moving nodes test shows that RTUP of 0.6 s still has a higher packet loss compared to RTUPs of 6 sand 60 s.
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    Wireless Sensor Network Communication Protocols
    (2011) Zhang, Weiqi; Nickerson, Bradford, G.
    CS6999 Wireless Sensor Network (WSN) Communication Protocols aims at understanding how WSN communication protocols work. We focus on the data link, network and transport layer of the Open Systems Interconnection (OSI) model. Medium Access Control (MAC) protocols provide addressing and channel access control mechanisms that make it possible for several terminals or network nodes to communicate within a multi-point network. In this survey, the assumption is that nodes in the network are fixed in one location, but the radio communication space is highly dynamic due to interference from the environment or from competing traffic in the same (or nearby) frequency bands.