| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 97 === Wireless sensor network (WSN) consists of some sensor nodes. Because of the transmission limit of sensor nodes, it sometimes constructs the type of the network topology such as cluster-tree topology or mesh topology in large area application. However, the first problem in this type topology is that it may occur beacon collision because the beacon of the coordinator in the personal area network (PAN) may cause collision in others personal area network. Thus, it causes some devices not to work in the area of collision and decrease the performance and life of the wireless sensor network.
In order to solve the above-mentioned problems, we proposed the hash-based beacon slot election scheme (HBSES). It can select a period as a beacon frame slot to transmit beacon in the active period of the superframe according to the hash function. Thus, it can decrease the beacon collision ratio effectively, improve the system throughput, and increase the wireless sensor network’s life. We compare our proposed scheme, IEEE 802.15.4 standard, and some above-mentioned schemes by simulations. The simulation results of the beacon collision ratio and other performance indicators show the improvement of our scheme.
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