| Summary: | 碩士 === 元智大學 === 資訊工程學系 === 95 === The technologies of sensing and wireless network have various applications in many diverse fields, such as environmental monitoring, warfare monitoring, child education, surveillance,...etc. Due to their broad varieties of applications, wireless sensor networks have received wide attentions in recent years. Basically, wireless sensor networks consist of a base station and a large number of sensor nodes. Base station usually collects and processes the data forwarded from the sensor nodes, and the sensor nodes are responsible to collect the data which we interested. However, each sensor node is limited by its battery power. In order to forward the data to base station efficiently, many researchers have proposed the multiple-path routing protocols.
To implement the multiple-path routing protocols, some researchers try to forward the multiple copies of data to base station to ensure the data delivery. Other authors construct the source-destination routing table, utilize one primary path for transmitting the data, and keep the others as backup. When the routing path broke, another path will be used. Since these approaches may cause some overheads, we will make the improvements.
In this paper, we propose an approach on improving the routing table. Basically, we extend the routing table into two layers, so we may have more routing path information. When the routing table in first layer is exhausted, we could use the routing table in second layer. From the simulation result, it shows that our approach could improve both the network lifetime and data delivery rate.
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