Adaptive Power-Aware Prefetching Schemes for Mobile Broadcast Environments
Caching and prefetching are common techniques in mobile broadcast environments. Several prefetching policies have been proposed in the literature to either achieve the minimum access latency or save power as much as possible. However, little work has been carried out to adaptively balance these two metrics in a dynamic environment where the user request arrival patterns change over time. This paper investigates how both low latency and low power consumption can be achieved for dynamic request patterns. Two adaptive power-aware schemes, PT with secure region (PTSR) and adaptive prefetching with sliding caches (APSC), are proposed. Experimental results show the proposed policies, in particular APSC, achieve a much lower power consumption while maintaining a similar access latency as the existing policies.
KeywordsTime Slot Cache Size Secure Region Access Latency Object Unit
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- S. Acharya, R. Alonso, M. Franklin, and S. Zdonik. Broadcast disks: Data management for asymmetric communications environments. In Proceedings of ACM SIGMOD Conference on Management of Data, pages 199–210, San Jose, CA, USA, May 1995.Google Scholar
- S. Acharya, M. Franklin, and S. Zdonik. Prefetching from a broadcast disk. In Proceedings of the 12th International Conference on Data Engineering (ICDE’96), pages 276–285, New Orleans, LA, USA, February 1996.Google Scholar
- V. Grassi. Prefetching policies for engery saving and latency reduction in a wireless broadcast data delivery system. In Proceedings of the 3rd ACM International Work on Modeling, Analysis and Simulation of Wireless and Mobile Systems (MSWiM’00), Boston, MA, USA, August 2000.Google Scholar
- H. B. Hu, J. L. Xu, and D. L. Lee. Adaptive power-aware prefetching schemes for mobile broadcast environments. Technical report, Department of Computer Science, Hong Kong University of Science and Technology, http://www.cs.ust.hk/haibo/pub/prefetching.pdf, June 2002.