| Summary: | 碩士 === 淡江大學 === 資訊管理學系碩士班 === 94 === Recent advances in technology have made low cost, lower power wireless sensor a reality. Clock synchronization is an important service in any distributed system, including sensor network system. Time synchronization may use in the saving power mechanism. For instance IEEE 802.11 PSM is penetrates time synchronization TSF is a foundation, then achieve the saving power. The wireless sensor network the electric power origin is a battery. The wireless sensor network is put down in the outside environment, mostly no longer recycles. Therefore for increases the wireless sensor network the life, saves the electricity mechanism to be more important. The present paper discussion time synchronization question, hoped with comparatively saves the electricity the method to achieve the time synchronization goal. We propose an Efficient Timing Synchronization Protocol (ETSP) in view of under the wireless sensor network environment. We use the wireless sensor network cannot move the characteristic, reduces the node transmission time synchronization beacon. And is cyclic period of time to redo time synchronization again. IEEE 802.11 TSF time synchronization uses the long-enduring transmission beacon. In this process can consume the massive electric powers. ETSP adopts has the transmission beacon which the number of times limits. And in already by time synchronization node, also adopts does not transmit the beacon to save the electric quantity. ETSP confirms at the experiment may save the electric power, and may let various pitch points electric quantity consumption average. We in the entity wireless sensor network really makes the confirmation feasibility.
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