| Summary: | 碩士 === 國立臺灣大學 === 電機工程學研究所 === 99 === Staff shortages and the increasingly aging population have strained the ability of elder-care center to provide high quality medical treatment. To deal with these issues, a wireless sensor network (WSN) is deployed in the Bei-Hu nursing home to assist the nursing staff in tracking the elder''s daily life and mobility. The WSN is, however, constrained from the limited computation capability of the micro-controller in the sensor node. A multi-hop routing mechanism collecting data from the sensor node to a remote computer is thus indispensible. To conform with the requirement of mobility tracking, the collection protocol should satisfy both timely and high-delivery-rate transmissions. This work is intended to have a realistic evaluation of two collection protocols to see whether the above two requirements are achieved. The routing protocol we evaluate is called magnetic diffusion (MD), which is used in Bei-Hu hospital now. The state-of-the-art Collection Tree Protocol (CTP) is chosen as the comparison baseline. From the traces we collected, we find that CTP has a better performance than MD in the latency range of 200ms in the static experiments. In the mobile experiment, MD and CTP are comparable when there are two mobile sources in the network.
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