Proactive Wireless Caching at Mobile User Devices for Energy Efficiency

Date

2015-08-28

Author

Gungor, Arif Can
Gunduz, Deniz

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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Proactive content caching at user terminals is studied from an energy efficiency perspective. Assuming that the variable-rate demands of a user can be predicted accurately over a certain time period, the optimal transmission strategy that minimizes the total energy consumption is characterized. The reduction in the energy consumption is obtained both by increasing the total transmission time of a request, and by downloading it at better channel conditions, rather than downloading it at the time of use. Both gains are possible thanks to the limited cache memory at the user device, in which the pre-downloaded content is stored until it is requested by the application layer, such as a video player. We formulate the optimal proactive transmission strategy as the solution of a convex optimization problem, and evaluate the minimum total energy requirement numerically. We also provide a backward water-filling interpretation for the optimal caching strategy.

Subject Keywords

Video, Networks

URI

https://hdl.handle.net/11511/66013

Collections

Department of Electrical and Electronics Engineering, Conference / Seminar

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Citation Formats

A. C. Gungor and D. Gunduz, “Proactive Wireless Caching at Mobile User Devices for Energy Efficiency,” 2015, p. 0, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/66013.