Energy-Efficient Data Caching and Prefetching for Mobile Devices Based on Utility

Huaping Shen, Mohan Kumar, Sajal K. Das, Zhijun Wang
2005 Journal on spesial topics in mobile networks and applications  
In mobile computing environments, vital resources like battery power and wireless channel bandwidth impose significant challenges in ubiquitous information access. In this paper, we propose a novel energy and bandwidth efficient data caching mechanism, called GreedyDual Least Utility (GD-LU), that enhances dynamic data availability while maintaining consistency. The proposed utility-based caching mechanism considers several characteristics of mobile distributed systems, such as
more » ... nection, mobility handoff, data update and user request patterns to achieve significant energy savings in mobile devices. We develop an analytical model for energy consumption of mobile devices in a dynamic data environment. Based on the utility function derived from the analytical model, we propose algorithms for cache replacement and passive prefetching of data objects. Our comprehensive simulation experiments demonstrate that the proposed caching mechanism achieves more than 10% energy saving and near-optimal performance tradeoff between access latency and energy consumption. 6 7 8 9 10 11 12 13 14 Keywords: wireless networks, mobile devices, caching, prefetching, energy efficient 15 42 of the existing prefetching schemes [6,9,11] use uplink band-43 width and battery energy to improve cache hit ratio and re-44 duce access latency. Broadcast and multicast [1,2] are proven 45 as effective data dissemination techniques in mobile comput-46 ing environments. A prefetching scheme that considers both 47
doi:10.1007/s11036-005-1559-8 fatcat:ek6rjvadtzdgtjdmc6c7xvupfi