| Xu Chaonong （徐朝农）,Xu Yongjun,Wang Zhiguang,Wang Feng.[J].高技术通讯(英文),2012,18(2):179~185 |
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| A study on synchronization error accumulation over hop count for synchronization scheme of two-way packet exchange① |
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| DOI： |
| 中文关键词: |
| 英文关键词: wireless sensor networks(WSN), clock drift, time synchronization, clock synchronization, accumulation |
| 基金项目: |
| Author Name | Affiliation | | Xu Chaonong （徐朝农） | | | Xu Yongjun | | | Wang Zhiguang | | | Wang Feng | |
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| 中文摘要: |
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| 英文摘要: |
| Two-way packet exchange synchronization scheme has been widely used in wireless sensor networks. However, due to the fact that its synchronization error accumulates rapidly over hop count, its applications are greatly restricted. In this paper, the factors that cause the accumulation of synchronization error over hop count are investigated. Theoretical analysis shows that two factors including the clock drift and the asymmetry of two-way packet exchange, have distinct influences on synchronization error between two adjacent nodes. Further, the clock frequency order along synchronization path is found to be vital to the accumulation of synchronization error. The above three factors jointly determine the accumulation of synchronization error over hop count in wireless network. Theoretic results are also verified by three fine-grained experiments on wireless sensor network testbed. The conclusions can be used to decrease synchronization error for large-scale wireless network by careful network deployment. |
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