| Summary: | 碩士 === 國立中央大學 === 資訊工程研究所 === 90 ===
In wireless sensor networks, the goal is to gather intended data from a number of sensor nodes and propagate this information back to the infrastructure for further processing. Multi-hop transmission is required to extend the reachable data range. Under the constraint of limited energy resources, power conservation is a key to success for multi-hop wireless sensor networks to sustain a longer time. To maximize the lifetime of ad hoc sensor networks, the power consumption rate of individual nodes must be balanced. To reduce the power consumption when a node is not active, low power mode is applied; an energy efficient access scheme is required to revive the sleeping node. Bluetooth is a promising standard for low power, short-range and low-cost wireless communications. However, currently there is no suitable scheme for multi-hop Bluetooth ad hoc network establishment. Therefore, this thesis considers a data collecting sensor network using Bluetooth technology. A fast and energy efficient Bluetooth scatternet formation algorithm is designed to construct the network, a energy aware routing scheme is proposed to balance the power consumption rate of each node, and an improvement of Bluetooth access procedure called Pre-contention access is also proposed to lengthen the node lifetime.
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