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http://dx.doi.org/10.3745/KIPSTA.2009.16A.5.357

An Efficient WLAN Device Power Control Technique for Streaming Multimedia Contents over Mobile IP Storage  

Nam, Young-Jin (대구대학교 컴퓨터.IT공학부)
Choi, Min-Seok (대구대학교 컴퓨터구조연구실)
Publication Information
The KIPS Transactions:PartA / v.16A, no.5, 2009 , pp. 357-368 More about this Journal
Abstract
Mobile IP storage has been proposed to overcome storage limitation in the flash memory and hard disks. It provides almost capacity-free space for mobile devices over wireless IP networks. However, battery lifetime of the mobile devices is reduced rapidly because of power consumption with continuous use of a WLAN device when multimedia contents are being streamed through the mobile IP storage. This paper proposes an energy-efficient WLAN device power control technique for streaming multimedia contents with the mobile IP storage. The proposed technique consists of a prefetch buffer input/output module, a WLAN device power control module, and a reconfigurable prefetch buffer module. Besides, it adaptively determines the size of the prefetch buffer according to a quality of the multimedia contents, and it dynamically controls the power mode of the WLAN device on the basis of power on-off operations while streaming the multimedia contents. We evaluate the performance of the proposed technique on a PXA270-based mobile device that employs the embedded linux 2.6.11, Intel iSCSI reference codes, and a WLAN device. Extensive experiments reveal that the proposed technique can save the energy consumption of the WLAN device up to 8.5 times with QVGA multimedia contents, as compared with no power control.
Keywords
Wireless LAN; Power Control; Mobile IP Storage;
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