Will caching at base station improve energy efficiency of downlink transmission?

Caching popular contents at the base station (BS) can reduce the end-to-end delay of service and the cost of cellular networks. Yet it is unknown whether introducing cache to BS can improve the energy efficiency (EE) of downlink systems. With BS caching, energy consumption for backhauling can be reduced, but caches will also consume energy. In this paper, we analyze the EE of two kinds of networks with a macro BS or multiple non-coordinated pico BSs with caches, where the impact of content popularity and request arrival density are considered. Analytical and simulation results show that introducing cache can improve the EE if the file catalog size is not too large and placing the caches at the pico BSs is more energy efficient.

[1]  Alexandros G. Dimakis,et al.  FemtoCaching: Wireless video content delivery through distributed caching helpers , 2011, 2012 Proceedings IEEE INFOCOM.

[2]  Seyed Pooya Shariatpanahi,et al.  Caching gain in wireless networks with fading: A multi-user diversity perspective , 2014, 2014 IEEE Wireless Communications and Networking Conference (WCNC).

[3]  3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (e-utra); Further Advancements for E-utra Physical Layer Aspects (release 9) , 2022 .

[4]  Mohamed Hefeeda,et al.  Traffic Modeling and Proportional Partial Caching for Peer-to-Peer Systems , 2008, IEEE/ACM Transactions on Networking.

[5]  Jens Zander,et al.  Impact of Backhauling Power Consumption on the Deployment of Heterogeneous Mobile Networks , 2011, 2011 IEEE Global Telecommunications Conference - GLOBECOM 2011.

[6]  Li Fan,et al.  Web caching and Zipf-like distributions: evidence and implications , 1999, IEEE INFOCOM '99. Conference on Computer Communications. Proceedings. Eighteenth Annual Joint Conference of the IEEE Computer and Communications Societies. The Future is Now (Cat. No.99CH36320).

[7]  Konstantinos Poularakis,et al.  Multicast-aware caching for small cell networks , 2014, 2014 IEEE Wireless Communications and Networking Conference (WCNC).

[8]  Muhammad Ali Imran,et al.  How much energy is needed to run a wireless network? , 2011, IEEE Wireless Communications.

[9]  Daniel C. Kilper,et al.  In-network caching effect on optimal energy consumption in content-centric networking , 2012, 2012 IEEE International Conference on Communications (ICC).

[10]  Alexandros G. Dimakis,et al.  Femtocaching and device-to-device collaboration: A new architecture for wireless video distribution , 2012, IEEE Communications Magazine.

[11]  Albrecht J. Fehske,et al.  Bit per Joule efficiency of cooperating base stations in cellular networks , 2010, 2010 IEEE Globecom Workshops.

[12]  Pablo Rodriguez,et al.  Watching television over an IP network , 2008, IMC '08.

[13]  Pablo Rodriguez,et al.  I tube, you tube, everybody tubes: analyzing the world's largest user generated content video system , 2007, IMC '07.