| exploiting fm radio data system for adaptive clock calibration in sensor networks | |
| Li Liqun; Xing Guoliang; Sun Limin; Huangfu Wei; Zhou Ruogu; Zhu Hongsong | |
| 2011 | |
| 会议名称 | 9th International Conference on Mobile Systems, Applications, and Services, MobiSys'11 and Co-located Workshops |
| 会议录名称 | MobiSys'11 - Compilation Proceedings of the 9th International Conference on Mobile Systems, Applications and Services and Co-located Workshops |
| 页码 | 169-181 |
| 会议日期 | 28-Jun-02 |
| 会议地点 | Bethesda, MD, United states |
| 收录类别 | EI |
| 出版地 | United States |
| ISBN | 9781450306430 |
| 部门归属 | (1) Institute of Software, Chinese Academy of Sciences, China; (2) Graduate University, Chinese Academy of Sciences, China; (3) Department of Computer Science and Engineering, Michigan State University, United States |
| 摘要 | Clock synchronization is critical for Wireless Sensor Networks (WSNs) due to the need of inter-node coordination and collaborative information processing. Although many message passing protocols can achieve satisfactory clock synchronization accuracy, they incur prohibitively high overhead when the network scales to more than tens of nodes. An alternative approach is to take advantage of the global time reference induced by existing infrastructures including GPS, timekeeping radio stations, or power grid. However, high power consumption and geographic constraints present them from being widely adopted in WSNs. In this paper, we propose ROCS, a new clock synchronization approach exploiting the Radio Data System (RDS) of FM radios. First, we design a new hardware FM receiver that can extract a periodic pulse from FM broadcasts, referred to as RDS clock. We then conduct a large-scale measurement study of RDS clock in our lab for a period of six days and on a vehicle driving through a metropolitan area of over 40 km2. Our results show that RDS clock is highly stable and hence is a viable means to calibrate the clocks of large-scale city-wide sensor networks. To reduce the high power consumption of FM receiver, ROCS intelligently predicts the time error due to drift, and adaptively calibrates the native clock via the RDS clock. We implement ROCS in TinyOS on our hardware FM receiver and a TelosB-compatible WSN platform. Our extensive experiments using a 12-node testbed and our driving measurement traces show that ROCS achieves accurate and precise clock synchronization with low power consumption. © 2011 ACM. |
| 关键词 | Data Processing Frequency Modulation Mechanical Clocks Message Passing Radio Broadcasting Radio Receivers Radio Stations Sensor Nodes Sensors Synchronization Wireless Networks |
| 主办者 | ACM SIGMOBILE; USENIX Association |
| 内容类型 | 会议论文 |
| URI标识 | http://ir.iscas.ac.cn/handle/311060/14309 |
| 专题 | 信息安全国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Li Liqun,Xing Guoliang,Sun Limin,et al. exploiting fm radio data system for adaptive clock calibration in sensor networks[C]. United States,2011:169-181. |
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