| Summary: | 碩士 === 東海大學 === 資訊工程與科學系 === 96 === In wireless sensor networks (WSNs), energy is one of the most important resources that should be economically used. But most routing approaches deployed by WSNs are hop-by-hop relay schemes, causing that sensors along a routing path should not only collect its environmental data, and then sending the data to base station, but also relay data received from its neighbors toward the base station. This will result in an unbalance energy consumption problem for WSNs, i.e., nodes near the base station will exhaust their energy more quickly than those far away, which is so-called energy hole problem. This problem appears in both message-evenly generated environment and event-driven WSNs. In the paper, we propose a routing assistant scheme with localized movement (RASLM) by using mobile nodes to help nodes along an active routing path to prevent them from dying much earlier than others. This scheme can also stabilize the routing path to ensure that the sensed data can be sent to base station safely and smoothly. The experimented results show that the RASLM can effectively improve the system lifetime in event-driven wireless sensor networks.
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