The Power Saving and Backup Mechanism in BAN with Multi-mode Dual-Routers

• Main Authors: How-Hang Liu, 劉浩航
• Other Authors: 蔡志宏
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/70839579496084705740

碩士 === 國立臺灣大學 === 電信工程學研究所 === 104 === Abstract Power saving is always a crucial issue in wireless body area network (BAN) research. In the architecture of a body area network, there often exits a type of devices called the personal router. Comparing with the sensors in the BAN, a personal router usually has less battery life. Therefore, it is essential to improve the battery life of personal routers in related research. Since mobile devices have become popular in recent years, there are more and more users equipped with both smart phone and tablet. Moreover, the use of the mobile power bank for preventing smart phone from out of energy also becomes common. Therefore, we assume that mobile power bank will evolve to a new device able to interconnect the internet and BAN in the future, and a user could have two or more networking devices. Therefore, we propose a novel BAN architecture which includes two wireless personal routers: one is the main router, and the other is used for battery backup. In order to extend the battery life of BAN, we design two instrumental mechanisms. The first is the backup mechanism which is started when one of two routers is in low energy. The second design is an offload mechanism which will offload large volume transmissions from certain sensor devices, such as Video Recorder(s). Moreover, through the offload mechanism a backup router can upload a large number of data packets via the Wi-Fi interface, which consumes much less energy than that when is upload through the 3G interface. We employ a network simulator called Castalia to verify the correctness of all designed algorithms in our mechanism. We also use power monitor to measure the power consumption of different wireless interfaces and background usage in there personal routers. Through those measurement results, we develop an energy consumption model which can predict the life time of our dual-router BAN. Finally, we employ several usage scenarios to calculate the expected life time of BAN, and then the effectiveness of our dual-router BAN architecture in extending network life time is validated.