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International Journal of Distributed Sensor Networks
Volume 2012 (2012), Article ID 868943, 9 pages
http://dx.doi.org/10.1155/2012/868943
Research Article

Two-Layer Storage Scheme and Repair Method of Failure Data in Wireless Sensor Networks

1School of Computer Science and Technology, Xidian University, Shaanxi, Xi’an 710071, China
2Department of Computer Science, Wayne State University, Detroit, MI 48202, USA

Received 20 July 2012; Accepted 8 September 2012

Academic Editor: Fu Xiao

Copyright © 2012 Yulong Shen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Distributed data storage is a key technology in the data collection in wireless sensor networks. The storage scheme based on network coding is applied to data collection in wireless sensor networks because of its high reliability and low overhead. However, it is an open problem to reduce data repair communication overhead caused by the failure of storage nodes. This paper focuses on this issue and presents a two-layer distributed data storage scheme. The lower-layer nodes store the encoded data blocks and the upper-layer nodes store the re-encoded blocks that are responsible for failure data recovery. Based on the two-layer data storage scheme, a data repair method is proposed to decrease the repair communication overhead with only sacrificing lower storage overhead. Compared with MSR, interference alignment-based scheme and group interference alignment scheme, the proposed method has lower repair communication overhead. We prove that the proposed method can reduce the repair communication overhead to times and it is suitable to resource-constrained distributed wireless sensor networks.