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http://dx.doi.org/10.3837/tiis.2016.02.002

A Survey of Energy Efficiency Optimization in Heterogeneous Cellular Networks  

Abdulkafi, Ayad A. (Electrical Engineering Department, Tikrit University)
Kiong, Tiong S. (Power Engineering Center, Universiti Tenaga Nasional)
Sileh, Ibrahim K. (Electrical Engineering Department, Tikrit University)
Chieng, David (Wireless Innovation, MIMOS Berhad)
Ghaleb, Abdulaziz (Qatar Mobility Innovations Center (QMIC))
Publication Information
KSII Transactions on Internet and Information Systems (TIIS) / v.10, no.2, 2016 , pp. 462-483 More about this Journal
Abstract
The research on optimization of cellular network's energy efficiency (EE) towards environmental and economic sustainability has attracted increasing attention recently. In this survey, we discuss the opportunities, trends and challenges of this challenging topic. Two major contributions are presented namely 1) survey of proposed energy efficiency metrics; 2) survey of proposed energy efficient solutions. We provide a broad overview of the state of-the-art energy efficient methods covering base station (BS) hardware design, network planning and deployment, and network management and operation stages. In order to further understand how EE is assessed and improved through the heterogeneous network (HetNet), BS's energy-awareness and several typical HetNet deployment scenarios such as macrocell-microcell and macrocell-picocell are presented. The analysis of different HetNet deployment scenarios gives insights towards a successful deployment of energy efficient cellular networks.
Keywords
Energy efficiency; HetNet; sleep mode; load adaptive;
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1 N. Bayer, D. Sivchenko, H. J. Einsiedler, et al. "Energy optimisation in heterogeneous multi-RAT networks," in Proc. of 2011 15th Int. Conf. Intell. Next Gener. Networks, pp. 139-144, Oct. 2011. Article (CrossRef Link).
2 Y. Chen, X. Xu, and Q. Lei, "Joint Subcarriers and Power Allocation with Imperfect Spectrum Sensing for Cognitive D2D Wireless Multicast," KSII Transactions on Internet and Information Systems, vol. 7, no. 7, pp. 1533–1546, 2013. Article (CrossRef Link).   DOI
3 A. Ambrosy, O. Blume, H. Klessig, and W. Wajda, "Energy saving potential of integrated hardware and resource management solutions for wireless Base Stations," in Proc. of 2011 IEEE Int. Symp. Pers. Indoor Mob. Radio Comm., pp. 2418-2423, Sep. 2011. Article (CrossRef Link).
4 A. De Domenico, E. Calvanese Strinati, and A. Capone, "Enabling Green cellular networks: A survey and outlook," Comput. Comm., vol. 37, pp. 5–24, Jan. 2014. Article (CrossRef Link).   DOI
5 D. Lee, S. Zhou, and Z. Niu, "Spatial Modeling of Scalable Spatially-Correlated Log-Normal Distributed Traffic Inhomogeneity and Energy-Efficient Network Planning," in Proc. of IEEE Wirel. Comm. Netw. Conf., pp. 1285-1290, Apr. 2013. Article (CrossRef Link).
6 A. J. Fehske, P. Marsch, and G. P. Fettweis, "Bit per Joule efficiency of cooperating BSs in cellular networks," in Proc. of 2010 IEEE Globecom Work., pp. 1406-1411, Dec. 2010. Article (CrossRef Link).
7 H. Leem, S. Y. Baek, and D. K. Sung, "The Effects of Cell Size on Energy Saving, System Capacity, and Per-Energy Capacity," in Proc. of 2010 IEEE Wirel. Comm. Netw. Conf., pp. 1-6, 2010. Article (CrossRef Link).
8 X. Zhang, Z. Su, Z. Yan, and W. Wang, "Energy-Efficiency Study for Two-tier HetNet Under Coverage Performance Constraints," Mob. Net. Appl., vol. 18, no. 4, pp. 567–577, 2013. Article (CrossRef Link).   DOI
9 S. Cho and W. Choi, "Energy-Efficient Repulsive Cell Activation for Heterogeneous Cellular Networks," IEEE J. Sel. AREAS Comm., vol. 31, no. 5, pp. 870–882, 2013. Article (CrossRef Link).   DOI
10 A. A. Abdulkafi, T. S. Kiong, D. Chieng, A. Ting, and J. Koh, "Energy Efficiency Improvements in Heterogeneous Network Through Traffic Load Balancing and Sleep Mode Mechanisms," Wirel. Pers. Comm., vol. 75, no. 4, pp. 2151–2164, Oct. 2014. Article (CrossRef Link).   DOI
11 D. Lopez-Perez, "Enhanced intercell interference coordination challenges in HetNet," IEEE Wirel. Comm., Vol. 18, no. 3, pp. 22–30, 2011. Article (CrossRef Link).   DOI
12 3GPP TR 36.839 V11, "Mobility Enhancements in HetNet (Release 11)," Tech. report, 2012. Article (CrossRef Link).
13 Zheng, Kan, Yue Li, Yingkai Zhang, Zheng Jiang, and Hang Long. "Performance Analysis and Evaluation of Deployment in Small Cell Networks," KSII Transactions on Internet and Information Systems (TIIS), vol. 9, no. 3, pp. 886-900, 2015. Article (CrossRef Link).
14 S. Landstrom, A. Furuskar, K. Johansson, L. Falconetti, and F. Kronestedt, "HetNet – increasing cellular capacity," Ericsson review, pp. 1–6, 2011. Article (CrossRef Link).
15 X. Wang, A. V. Vasilakos, M. Chen, Y. Liu, T. Taekyoung, and T. T. Kwon, "A Survey of Green Mobile Networks: Opportunities and Challenges," Mob. Netw Appl., vol. 17, no.1, pp. 4–20, 2011. Article (CrossRef Link).   DOI
16 S. Tombaz, A. Vastberg, and J. Zander, "Energy- and cost-efficient ultra-high-capacity wireless access," IEEE Wirel. Comm., vol. 18, no. 5, pp. 18–24, 2011. Article (CrossRef Link).   DOI
17 D. Jiang, X. Wang, Y. Zhang, Y. Zheng, X. Shen, and G. Liu, "Frequency Shifted Frequency Reuse for LTE Heterogeneous Networks," in Proc. of Int. Conf. on Wirel. Comm., Netw. and Mob. Comp., pp. 1-5, 2011. Article (CrossRef Link).
18 S. Tombaz, P. Monti, K. Wang, V. Anders, M. F. "Impact of Backhauling Power Consumption on the Deployment of Heterogeneous Mobile Networks," in Proc. of IEEE Global Telecom, pp. 1-5, 2011. Article (CrossRef Link).
19 A. B. Saleh, S. Redana, and B. Raaf, "Comparison of relay and pico eNB deployments in LTE-advanced," in Proc. of IEEE Vehicular Technology Conference Fall, pp. 1-5, 2009. Article (CrossRef Link).
20 R. Fred, A. J. Fehske, P. Marsch, and G. Fettweis, "Traffic demand and energy efficiency in heterogeneous cellular mobile radio networks," in Proc. of IEEE Veh. Tech. Conf., pp. 1-6, 2010. Article (CrossRef Link).
21 Y. Huang and B. Rao, "An analytical framework for heterogeneous partial feedback design in heterogeneous multicell OFDMA networks," IEEE T. Sig. Proc., vol. 61, no. 3, pp.753–769, 2013. Article (CrossRef Link).   DOI
22 Y. Soh and T. Quek, "Energy efficient heterogeneous cellular networks," IEEE Comm. Sel. Areas, vol. 31, no. 5, pp. 840–850, 2013. Article (CrossRef Link).   DOI
23 M.Jada and J. Hamalainen, "Power efficiency model for mobile access network," in Proc. of Pers., Indoor and Mobile Radio Communications Workshops, pp. 317-322, 2010. Article (CrossRef Link).
24 D. Feng, C. Jiang, G. Lim, L. C. Jr, G. Feng, and G. Li, "A survey of energy-efficient wireless communications," IEEE Comm. Surv. Tutorials, vol. 15, no. 1, pp. 167–178, 2012. Article (CrossRef Link).   DOI
25 G. He, S. Zhang, Y. Chen, and S. Xu, "Fundamental tradeoffs and evaluation methodology for future green wireless networks," in Proc. of IEEE Int. Conf. Comm. China Work., pp. 74-78, Aug. 2012. Article (CrossRef Link).
26 Y. Hou and D. Laurenson, "Energy efficiency of high QoS heterogeneous wireless communication network," in Proc. of IEEE Conf. Vech Technology. Fall (VTC 2010-Fall), pp. 1-5, 2010. Article (CrossRef Link).
27 C. Vikram, J. G. Andrews, and A. Gatherer, "Femtocell networks: a survey," IEEE Comm. Mag., vol. 46, no. 9, pp. 59–67, 2008. Article (CrossRef Link).   DOI
28 Xiaohu Ge, Chengqian Cao, Minho Jo, Min Chen, Jinzhong Hu, and Iztok Humar, "Energy efficiency modelling and analyzing based on multi-cell and multi-antenna cellular networks," KSII Trans. on Internet and Info. Syst., vol. 4, no. 4, pp.560-574, 2010. Article (CrossRef Link)..   DOI
29 K. Dufkova, M. Bjelica, B. Moon, and L. Kencl, "Energy savings for cellular network with evaluation of impact on data traffic performance," in Proc. of IEEE Eur. Wire. Conf., pp. 916-923, 2010. Article (CrossRef Link).
30 C. Liu, Z. Pan, N. Liu, and X. You, "A novel energy saving strategy for LTE HetNet," in Proc. of 2011 Int. Conf. Wirel. Comm. Signal Process, pp. 1-4, Nov. 2011. Article (CrossRef Link).
31 J. Hoydis, "Green small-cell networks," in Proc. of IEEE Conf. Veh. Technol., pp. 37-43, 2011. Article (CrossRef Link).
32 Q. T. QS, W. C. Cheung, and M. Kountouris, "Energy Efficiency Analysis of Two-Tier Heterogeneous networks," in Proc. of European Wireless Conf. Sustainable Wireless Tech., pp. 712-716, 2011. Article (CrossRef Link).
33 J. Manner, M. Luoma, J. Ott, and J. Hämäläinen, "Mobile networks unplugged," in Proc. of ACM Proc. Int. Conf. on Energy-Efficient Computing and Netw., pp. 71-74, 2010. Article (CrossRef Link).
34 W. Guo, C. Turyagyenda, H. Hamdoun, S. Wang, P. Loskot, and T. O. Farrell, "Towards a low energy LTE cellular network: architectures," in Proc. of IEEE Europ. Sig. Proc. Conf., pp. 879-883, 2011. Article (CrossRef Link).
35 Abdulkafi, A. A., Kiong, T. S., Koh, J. S., Chieng, D., Ting, A., & Ghaleb, A. M. "Energy efficiency of LTE macro Base Station," in Proc. of IEEE Int. Symp. Tele. Tech. (ISTT), pp. 259-264, 2012. Article (CrossRef Link).
36 O. Adigun and C. Politis, "Energy efficiency analysis for MIMO transmission schemes in LTE," in Proc. of IEEE Int. Work. Comput. Aided Model. Des. Comm. Links Networks, pp. 77-81, Jun. 2011. Article (CrossRef Link).
37 R. Jain, S. Katiyar, and N. Agrawal, "Hierarchical Cellular Structures in High-Capacity Cellular Communication Systems," arXiv Prepr. arXiv1110.2627, vol. 2, no. 9, pp. 51-57, 2011.
38 N. Vallina-Rodriguez and J. Crowcroft, "Energy management techniques in modern mobile handsets," IEEE Comm. Surv. Tutorials, vol. 15, no. 1, pp. 179–198, 2013. Article (CrossRef Link).   DOI
39 Zhu, Jia. "Energy efficiency analysis of cellular downlink transmission with network coding over Rayleigh fading channels," KSII Trans. on Internet and Info. Sys., vol. 7, no. .3 pp. 446-458, 2013. Article (CrossRef Link).   DOI
40 T. Chen, Y. Yang, and H. Zhang, "Network energy saving technologies for green wireless access networks," IEEE Wirel. Comm., vol. 18, no. 5, pp. 30-38, 2011.Article (CrossRef Link).   DOI
41 A. J. Fehske, F. Richter, and G. P. Fettweis, "Energy Efficiency Improvements through Micro Sites in Cellular Mobile Radio Networks," in Proc. of 2009 IEEE Globecom Work., pp. 1-5, Nov. 2009. Article (CrossRef Link)
42 I. Humar, X. Ge, L. Xiang, M. Jo, M. Chen, and J. Zhang, "Rethinking Energy Efficiency Models of Cellular Networks with Embodied Energy," IEEE Netw. Mag., vol. 25, no. 2, pp. 40–49, 2011. Article (CrossRef Link).   DOI
43 Yu, J., Wu, S., Lin, X., & Zhang, Q. "Radio Resource Management of CoMP System in HetNet under Power and Backhaul Constraints," KSII Trans. on Internet & Info. Sys., vol. 8, no. 11, pp. 3876-3895, 2014. Article (CrossRef Link).   DOI
44 P. Mahadevan, P. Sharma, S. Banerjee, and P. Ranganathan, "A power benchmarking framework for network devices," Springer Berlin Heidelberg networking, pp. 795-808, 2009. Article (CrossRef Link).
45 W. Wang and G. Shen, "Energy Efficiency of Heterogeneous Cellular Network," in Proc. of 2010 IEEE 72nd Veh. Technol. Conf. - Fall, pp. 1-5, Sep. 2010. Article (CrossRef Link).
46 F. I. Di Piazza, S. Mangione, and I. Tinnirello, "Maximizing network capacity in an heterogeneous macro-micro cellular scenario," IEEE Symp. Comput. Comm., pp. 365-370, 2011. Article (CrossRef Link).
47 Z. Chong and E. Jorswieck, "Analytical Foundation for Energy Efficiency Optimisation in Cellular Networks with Elastic Traffic," in Proc. of Mobile Lightweight Wireless Sys., pp. 18-29, 2012. Article (CrossRef Link).
48 K. Son, H. Kim, Y. Yi, and B. K, "BS Operation and User Association Mechanisms for Energy-Delay Tradeoffs in Green Cellular Networks," IEEE J. Sel. Areas Comm., vol. 29, no. 8, pp. 1525–1536, Sep. 2011. Article (CrossRef Link).   DOI
49 K. Dufková and J. Le Boudec, "Energy consumption comparison between macro-micro and public femto deployment in a plausible LTE network," in Proc. of ACM Proc. of the 2nd Int. Conf. on Energy-Efficient Computing and Netw., pp. 67-76, 2011. Article (CrossRef Link).
50 L. Saker, S. E. Elayoubi, L. Rong, and T. Chahed, "Capacity and Energy Efficiency of Picocell Deployment in LTE-A Networks," in Proc. of IEEE 73rd Veh. Technol. Conf., pp. 1-5, May 2011. Article (CrossRef Link).
51 T. Chen, H. Kim, and Y. Yang, "Energy Efficiency Metrics For Green Wireless Communications," in Proc. of IEEE Int. Conf. on Wireless Communications and Signal Processing, pp. 1-6, 2010. Article (CrossRef Link).
52 F. Richter, G. Fettweis, M. Gruber, and O. Blume, "Micro Base Stations in Load Constrained Cellular Mobile Radio Networks," in Proc. of IEEE Pers. Ind. and Mob. Radio Commun. Work, pp. 357-362, 2010. Article (CrossRef Link).
53 G. Auer, M. A. A. Imran, J. Malmodin, G. Bicz, I. Godor, et al., "Enablers for Energy Efficient Wireless Networks," pp. 1–5, 2010. Article (CrossRef Link).
54 B. Badic, T. O. Farrell, P. Loskot, and J. He, "Energy Efficient Radio Access Architectures for Green Radio : Large versus Small Cell Size Deployment," in Proc. of IEEE Veh.Tech. Conf., Fall, pp. 1-5, 2009. Article (CrossRef Link).
55 J. He, P. Loskot, T. O'Farrell, S. Armour, and J. Thompson, "Energy Efficient Architectures and Techniques for Green Radio Access Networks," in Proc. of Int. Conf. on Comm., pp. 1-6, 2010. Article (CrossRef Link).
56 M. C. Parker and S. D. Walker, "Roadmapping ICT: An Absolute Energy Efficiency Metric," J. Opt. Comm. Netw., vol. 3, no. 8, pp. A49-A58, Jul. 2011. Article (CrossRef Link).   DOI
57 G. Auer, O. Blume, V. Giannini, and I. Gódor, "D2. 3: energy efficiency analysis of the reference systems, areas of improvements and target breakdown," EARTH, pp. 1-69, 2010. Article (CrossRef Link).
58 H. Hamdoun, P. Loskot, T. O’Farrell, and J. He, "Survey and applications of standardized energy metrics to mobile networks," Ann. TeleComm., vol. 67, no. 3–4, pp. 113–123, Feb. 2012. Article (CrossRef Link).   DOI
59 M. M.-S. Alouini and J. Goldsmith, "Area spectral efficiency of cellular mobile radio systems," IEEE Trans. Veh. Technol., vol. 48, no. 4, pp. 1047–1066, Jul. 1999. Article (CrossRef Link).   DOI
60 F. Richter, A. J. Fehske, and G. P. Fettweis, "Energy Efficiency Aspects of Base Station Deployment Strategies for Cellular Networks," in Proc. of IEEE Veh. Technol. Conf., Fall, pp. 1-5, 2009. Article (CrossRef Link).
61 O. Arnold, F. Richter, G. Fettweis, and O. Blume, "Power consumption modeling of different Base Station types in heterogeneous cellular networks," in Proc. of IEEE Conf. futr. Netw. Mob. Summit, pp. 1-8, 2010. Article (CrossRef Link).
62 Y. Chen, S. Zhang, S. Xu, and and G. Y. Li., "Fundamental Trade-offs on Green Wireless Networks," IEEE Comm. Mag., vol. 49, no. 6, pp. 30–37, 2011. Article (CrossRef Link).   DOI
63 M. Gruber, O. Blume, and D. Ferling, "EARTH—Energy Aware Radio and Network Technologies," in Proc. of IEEE Int. Symp. on Pers. Indoor and Mobile Radio Comm., pp. 1-5, 2009. Article (CrossRef Link).
64 C. Han, T. Harrold, S. Armour, I. Krikidis, S. Videv, P. Grant, H. Haas, J. Thompson, I. Ku, C.-X. Wang, T. Le, M. Nakhai, J. Zhang, and L. Hanzo, "Green radio: radio techniques to enable energy-efficient wireless networks," IEEE Comm. Mag., vol. 49, no. 6, pp. 46–54, Jun. 2011. Article (CrossRef Link).   DOI
65 L. Collins, "Greening the global network," Eng. Technol., vol. 4, no. 5, pp. 64–65, 2010. Article (CrossRef Link).
66 Z. Hasan, H. Boostanimehr, and V. K. Bhargava, "Green Cellular Networks : A Survey, Some Research Issues and Challenges," IEEE Comm. Surv. Tut. vol. 13, no. 4, pp. 524–540, 2011. Article (CrossRef Link).   DOI
67 K. Mimis, K. a. Morris, and J. P. McGeehan, "A 2GHz GaN Class-J power amplifier for BS applications," in Proc. of IEEE Top. Conf. Power Amplifiers Wirel. Radio Appl., pp. 5-8, 2011. Article (CrossRef Link).
68 M. Jada, "Energy Efficiency Techniques & Challenges for Mobile Access Networks," PhD diss., Aalto University, 2011. Article (CrossRef Link).
69 J. Lorincz, T. Garma, and G. Petrovic, "Measurements and modelling of Base Station power consumption under real traffic loads," Sensors (Basel)., vol. 12, no. 4, pp. 4181–310, Jan. 2012. Article (CrossRef Link).   DOI
70 D. Brubaker, "Optimizing Performance and Efficiency of PAs in Wireless Base Stations: Digital pre-distortion reduces signal distortion at high power levels." White Paper, Texas Inst. 2008. Article (CrossRef Link).
71 J. Louhi, "Energy efficiency of modern cellular BSs." in Proc. of Int. Tele. Energy Conf., pp. 475-476, 2007. Article (CrossRef Link).
72 O. Hammi, A. Kwan, M. Helaoui, and F. M. Ghannouchi, "Green Power Amplification Systems for 3 G+ Wireless Communication Infrastructures," in Proc. of IEEE Veh. Tech. Conf., pp. 1-5, 2010. Article (CrossRef Link).
73 I. Ashraf, F. Boccardi, L. Ho, and B. Laboratories, "Power Savings in Small Cell Deployments via Sleep Mode Techniques," IEEE Pers., Indoor and Mob. Radio Commun., pp. 307-311, 2010. Article (CrossRef Link).
74 L. Correia, D. Zeller, and O. Blume, "Challenges and enabling technologies for energy aware mobile radio networks," Comm. Mag. IEEE, vol. 48, no. 11, pp. 66–72, 2010. Article (CrossRef Link).   DOI
75 H. Claussen, L. T. W. Ho, and F. Pivit, "Effects of joint macrocell and residential picocell deployment on the network energy efficiency," in Proc. of IEEE Int. Symp. on Pers., Indoor and Mobile Radio Communications, pp. 1-6, 2008. Article (CrossRef Link).
76 P. Saad, "Efficient and Wideband Power Amplifiers for Wireless Communications," PhD diss. Chalmers University of Technology, 2012. Article (CrossRef Link).
77 J. Lorincz and T. Matijevic, "Energy-efficiency analyses of heterogeneous macro and micro BS sites," Comput. Electr. Eng., vol. 40, no. 2, pp. 330–349, Feb. 2014. Article (CrossRef Link).   DOI
78 J. Kim, B. Kim, and Y. Woo, "Advanced design of linear Doherty amplifier for high efficiency using saturation amplifier," in Proc. of IEEE Microw. Symp., pp. 1573-1576, 2007. Article (CrossRef Link).
79 A. Amanna, "Green communications: annotated literature review and research vision," Wireless@ Virginia Tech, 2010. Article (CrossRef Link).
80 F. Richter and G. Fettweis, "Cellular Mobile Network Densification Utilizing Micro BSs," in Proc. of 2010 IEEE Int. Conf. Comm., pp. 1-6, May 2010. Article (CrossRef Link).
81 Y. Chen, S. Zhang, and S. Xu, "Characterizing Energy Efficiency and Deployment Efficiency Relations for Green Architecture Design," in Proc. of IEEE Int. Conf. Comm. Work., pp. 1-5, May 2010. Article (CrossRef Link).
82 C. Lee, S. Jung, Y. Kim, and J.-K. K. Rhee, "Energy efficient network planning: Issues and prospects in wired/wireless network," Ictc 2011, pp. 132-135, Sep. 2011. Article (CrossRef Link).
83 A. Capone, A. F. dos Santos, I. Filippini, and B. Gloss, "Looking beyond green cellular networks," in Proc. of 2012 9th Annu. Conf. Wirel. On-Demand Netw. Syst. Serv., pp. 127-130, Jan. 2012. Article (CrossRef Link).
84 M. Webb, "Smart 2020: Enabling the low carbon economy in the information age," The Climate Group. London, vol. 1, no.1, 2008. Article (CrossRef Link).
85 G. Koutitas, "Green Network Planning of Single Frequency Networks," IEEE Trans. Broadcast., vol. 56, no. 4, pp. 541–550, Dec. 2010. Article (CrossRef Link).   DOI
86 G. Weisi, S. Wang, X. Chu, J. Zhang, J. Chen, and H. Song., “Automated small-cell deployment for heterogeneous cellular networks," IEEE Comm. Mag., vol. 51, no. 5, pp. 46–53, 2013. Article (CrossRef Link).   DOI
87 A. A. Abdulkafi, S. K. Tiong, J. Koh, D. Chieng, and A. Ting, "Energy efficiency and cell coverage area analysis for macrocell networks," in Proc. of Int. Conf. Futur. Comm., Netw, pp. 1-6, 2012. Article (CrossRef Link).
88 T. Han and N. Ansari, "Optimizing cell size for energy saving in cellular networks with hybrid energy supplies," in Proc. of Global Communications Conference, pp. 5189-5193, 2012. Article (CrossRef Link).
89 P. Gonzalez-Brevis, J. Gondzio, Y. Fan, H. V. V. Poor "Base Station Location Optimization for Minimal Energy Consumption in Wireless Networks," in Proc. of IEEE Vehicular Tech. Conf., pp. 1-5, 2011. Article (CrossRef Link).
90 S. Tombaz, M. Usman, and J. Zander, "Energy efficiency improvements through HetNet in diverse traffic distribution scenarios," Int. ICST Conf. Comm. Netw., pp. 708-713, Aug. 2011. Article (CrossRef Link).
91 Lorincz J., Capone A., Begusic D. "Heuristic Algorithms for Optimization of Energy Consumption in Wireless Access Networks,” KSII Transactions on Internet and Information Systems Journal, vol. 5, no.4, pp. 624 – 648, 2011. Article (CrossRef Link).
92 T. Tesfay, R. Khalili, J. L. Le Boudec, F. Richter, and A. J. Fehske, "Energy saving and capacity gain of micro sites in regular LTE networks: downlink traffic layer analysis," in Proc. of 6th ACM Work. Perform. Monit. Meas. Heterog. Wirel. wired networks, pp. 83-91, 2011. Article (CrossRef Link).
93 A. A. Abdulkafi, S. K. Tiong, D. Chieng, A. Ting A. M. Ghaleb, "Modeling of Energy Efficiency in Heterogeneous Network," Res. J. Appl. Sci. Eng. Technol, vol. 6, no. 17, pp. 3193–3201, 2013. Article (CrossRef Link).
94 Z. Niu, S. Zhou, Y. Hua, Q. Zhang, and D. Cao, "Energy-Aware Network Planning for Wireless Cellular System with Inter-Cell Cooperation," IEEE Trans. Wirel. Comm., vol. 11, no. 4, pp. 1412–1423, Apr. 2012. Article (CrossRef Link).   DOI
95 Z. Niu, "TANGO: traffic-aware network planning and green operation," Wirel. Comm. IEEE, vol. 18, no. 5, pp. 25–29, 2011. Article (CrossRef Link).   DOI
96 L. Suarez, L. Nuaymi, and J. Bonnin, "An overview and classification of research approaches in green wireless networks," Eurasip J. Wirel. Comm. Netw., vol. 2012, no. 1, pp. 1-18, 2012. Article (CrossRef Link).   DOI
97 P. Kolios, V. Friderikos, and K. P., "A Practical Approach to Energy Efficient Communications in Mobile Wireless Networks," Mob. Networks Appl., vol. 17, no. 2, pp. 267-280, Jul. 2011. Article (CrossRef Link).   DOI
98 S. Han, C. Yang, and A. Molisch, "Traffic-aware base station doze in cooperative multicell systems," in Proc. of IEEE Int. Sig. and Info. Proc., pp. 394-398, 2013. Article (CrossRef Link).
99 A. Khandekar, N. Bhushan, J. Tingfang, and V. Vanghi, "LTE-Advanced: HetNet," in Proc. of 2010 Eur. Wirel. Conf., pp. 978-982, 2010. Article (CrossRef Link).
100 Jo, M., Maksymyuk, T., Batista, R. L., Maciel, T. F et al."A survey of converging solutions for heterogeneous mobile networks,” IEEE Wire. Commun., vol. 21, no. 6, pp. 54-62, 2014. Article (CrossRef Link).   DOI
101 Xu, S., Wang, H., Chen, T., Peng, T., Kwak, K. S. “Device-to-Device communication Underlaying Cellular Networks,” KSII Trans. on Internet and Info. Sys., vol. 6, no. 1, pp. 201-226, 2012. Article (CrossRef Link).
102 A. Sakr and E. Hossain, "Energy-Efficient Downlink Transmission in Two-Tier Network MIMO OFDMA Networks," in Proc. of IEEE Int. Conf. Comm., pp. 3652-3657, 2014. Article (CrossRef Link).
103 O. Eunsung, B. Krishnamachari, X. Liu, and Z. Niu "Toward Dynamic Energy-Efficient Operation of Cellular Network Infrastructure," IEEE Comm. Mag., vol. 49, no. 6, pp. 56–61, 2011. Article (CrossRef Link).   DOI
104 Jo, M., Maksymyuk, T., Strykhalyuk, B., & Cho, C. H. "Device-To-Device-Based Heterogeneous Radio Access Network Architecture For Mobile Cloud Computing,” IEEE Wirel. Commun., vol. 22, no. 3, pp. 50-58, 2015. Article (CrossRef Link).   DOI
105 H. Tao and N. Ansari, "On optimizing green energy utilization for cellular networks with hybrid energy supplies," IEEE Trans. Wirel. Comm., vol. 12, no. 8, pp. 3872–3882, 2013. Article (CrossRef Link).   DOI
106 A. Imran, F. Boccardi, and L. Ho, "Sleep mode techniques for small cell deployments," IEEE Comm. Mag., vol. 49, no. 8, pp. 72–79, 2011. Article (CrossRef Link).   DOI
107 Z. Niu, Y. Wu, J. Gong, Z. Yang, and F. In, "Cell zooming for cost-efficient green cellular networks," IEEE Comm. Mag., vol. 48, no. 11, pp. 74–79, 2010. Article (CrossRef Link).   DOI
108 K. Son, H. Kim, Y. Yi, and B. Krishnamachari, "Toward Energy-Efficient Operation of BSs in Cellular Wireless Networks," Green Communications: Theoretical Fundamentals, Algorithms and Applications, pp. 435-474, 2012. Article (CrossRef Link).
109 P. Mahadevan, P. Sharma, S. Banerjee, and P. Ranganathan, "Energy Aware Network Operations," in Proc. of IEEE INFOCOM Workshops 2009, pp. 1-6, 2009. Article (CrossRef Link).
110 A. A. Abdulkafi, S. K. Tiong, D. Chieng, A. et al. "Energy-Aware Load Adaptive Framework for LTE Heterogeneous Network," Trans. Emerg. Telecom. Technol, vol. 25, no. 9, pp. 943-953, 2014. Article (CrossRef Link).   DOI
111 E. Oh, K. Son, B. Krishnamachari, and A. Motivation, "Dynamic BS Switching-on / off Strategies for Green Cellular Networks," IEEE Trans. Wirel. Comm., vol. 12, no. 5, pp. 2126–2136, 2013. Article (CrossRef Link).   DOI
112 G. Micallef, L. Saker, S. E. Elayoubi, and H.-O. Sceck,"Realistic Energy Saving Potential of Sleep Mode for Existing and Future Mobile Networks," J. Comm., vol. 7, no. 10, pp. 740–748, 2012. Article (CrossRef Link).   DOI
113 Huang, J., Zhong, Z., & Huo, H. "A dynamic energy-saving strategy for green cellular railway communication network," EURASIP J. Wirel. Comm. and Netw., vol. 2015, no. 1, pp. 1-13, 2015. Article (CrossRef Link).
114 L. Saker, S. E. Elayoubi, T. Chahed, A. Gati, and C. Fourier, "Energy efficiency and capacity of heterogeneous network deployment in LTE-Advanced," in Proc. of Europ. Wirel. Conf., pp. 1-7, 2012. Article (CrossRef Link).
115 C. Khirallah and J. S. Thompson, "Energy Efficiency of HetNet in LTE-Advanced," J. Signal Process. Syst., vol. 69, no. 1, pp. 105–113, Dec. 2011. Article (CrossRef Link).   DOI
116 H. Holma and A. Toskala, LTE for UMTS-OFDMA and SC-FDMA based radio access. 2009. Article (CrossRef Link).
117 G. Auer, V. Giannini, C. Desset, I. Godor, P. Skillermark, M. Olsson, "How much energy is needed to run a wireless network?," IEEE Wirel. Comm., vol. 18, no. 5, pp. 40–49, 2011. Article (CrossRef Link).   DOI
118 E. Yaacoub, "Performance study of the implementation of green communications in LTE networks," in Proc. of 2012 19th Int. Conf. Telecomm., vol. 1, no. Ict, pp. 1-5, Apr. 2012. Article (CrossRef Link).
119 Z. Li, H. Wang, Z. Pan, N. Liu, and X. You, "Heterogenous QoS-guaranteed load balancing in 3GPP LTE multicell fractional frequency reuse network," Trans. Emerg. Telecom. Technol., vol. 25, no. 12, pp. 1169-1183, 2013. Article (CrossRef Link).   DOI
120 3GPP, "LTE Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Self-configuring and self-optimizing network (SON) use cases and solutions," 2010. Article (CrossRef Link).
121 C. Lange, D. Kosiankowski, R. Weidmann, and A. Gladisch, "Energy Consumption of Telecommunication Networks and Related Improvement Options," IEEE J. Sel. Top. Quantum Electron., vol. 17, no. 2, pp. 285–295, Mar. 2011. Article (CrossRef Link).   DOI
122 J. Baliga and R. Ayre, "Energy consumption in wired and wireless access networks," IEEE Commun Magazine, vol. 49, no. 6, pp. 70-77, 2011. Article (CrossRef Link).   DOI
123 H. Bogucka, "Degrees of Freedom for Energy Savings in Practical Adaptive Wireless Systems," IEEE Comm. Mag., vol. 49, no. 6, pp. 38-45, 2011. Article (CrossRef Link).   DOI
124 G. Auer, V. Giannini, M. Olsson, M. J. Gonzalez, and C. Desset, "Framework for Energy Efficiency Analysis of Wireless Networks," in Proc. of IEEE inter, Conf. on Wirel. Commun, pp.1-5,2011. Article (CrossRef Link).