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Mobile grids extend the concepts of grid computing through performance improvement of mobile devices and the development of wireless communication and offer mobility to grid service user. But mobile devices have various problems such as instability of wireless communication, intermittent connection, limit of power supply, and low communication bandwidth. These problems cause unreliable communication and many faults happened by unpredictable characteristics. In this paper, through taking checkpoints to local node and proxy server using context information such as mobility and communication information, the paper proposes fault tolerant techniques to perform jobs continuously when the faults occur in mobile devices.
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