Abstract
Properties of a large sensor network in a ubiquitous-City should include increased energy efficiency and reduced latency. These two properties are mainly dependent on the network size and the number of hops. Both of them can be improved by using an efficient clustering algorithm. In this paper, we introduce a clustering algorithm based on a passive optical network (PON) system, where optical line terminal is analogous to personal area network coordinator and optical network unit performs as cluster head. Application of a PON system to a sensor network can lead to an efficient converged network, because a PON system can integrate a large sensor network where a lot number of nodes are distributed over wide area. If the large network is converged on a single PON system, then the management of the system becomes very efficient and cost effective. We also present a new medium access control protocol to improve the performance of the sensor network. Proposed schemes are analyzed with a test network, and the results show that they are very efficient in delay-sensitive large sensor network.
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