[1]KHANDEKAR A, BHUSHAN N, TINGFANG J,et al. LTEAdvanced: heterogeneous networks [C]// Proceedings of the 2010 European Wireless Conference. Piscataway: IEEE, 2010: 978-982.
[2]DAMNJANOVIC A, MONTOJO J, WEI Y,et al. A survey on 3GPP heterogeneous networks [J]. IEEE Wireless Communications, 2011, 18(3): 10-21.
[3]FENG D, JIANG Z, LIM G, et al. A survey of energyefficient wireless communications [J]. IEEE Communications Surveys & Tutorials, 2013, 15(1): 167-178.
[4]NAVARATNARAJAH S, SAEED A, DIANATI M, et al. Energy efficiency in heterogeneous wireless access networks [J]. IEEE Wireless Communications, 2013, 20(5): 37-43.
[5]TALEB M, DIA M, FARHAT J, et al. On the design of energyaware 3G/WiFi heterogeneous networks under realistic conditions [C]// Proceedings of the 2013 27th International Conference on Advanced Information Networking and Applications Workshops. Piscataway: IEEE, 2013: 523-527.
[6]MAJLESI A, KHALAJ B H. An adaptive fuzzy logic based handoff algorithm for interworking between WLANs and mobile networks [C]// Proceedings of the 13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. Piscataway: IEEE, 2002,5: 2446-2451.
[7]SONG Q, JAMALIPOUR A. Quality of service provisioning in wireless LAN/UMTS integrated systems using analytic hierarchy process and grey relational analysis [C]// Proceedings of the 2004 IEEE Global Telecommunications Conference Workshops. Piscataway: IEEE, 2004: 220-224.
[8]ZHANG P, ZHOU W, XIE B, et al. A novel network selection mechanism in an integrated WLAN and UMTS environment using AHP and modified GRA [C]// Proceedings of the 2010 2nd IEEE International Conference on Network Infrastructure and Digital Content. Piscataway: IEEE, 2010: 104-109.
[9]CHAMODRAKAS I, MARTAKOS D. A utilitybased fuzzy TOPSIS method for energy efficient network selection in heterogeneous wireless networks [J]. Applied Soft Computing, 2012, 12(7): 1929-1938.
[10]CAO D, ZHOU S, NIU Z. Optimal combination of base station densities for energyefficient twotier heterogeneous cellular networks [J]. IEEE Transactions on Wireless Communications, 2013, 12(9): 4350-4362.
[11]ZHOU S, GONG J, YANG Z,et al. Green mobile access network with dynamic base station energy saving [C/OL]// Proceedings of the 15th Annual International Conference on Mobile Computing and Networking. New York: ACM, 2009. [2015-01-01]. http://network.ee.tsinghua.edu.cn/papers/bspowersaving090830.pdf.
[12]MARSAN M A. CHIARAVIGLIO L, CIULLO D,et al. Optimal energy savings in cellular access networks [C]// Proceedings of the 2009 IEEE International Conference on Communications Workshops. Piscataway: IEEE, 2009: 1-5.
[13]RODOPLU V, MENG T H. BitsperJoule capacity of energylimited wireless networks [J]. IEEE Transactions on Wireless Communications, 2007, 6(3): 857-865.
[14]HAN C, HARROLD T, ARMOUR S, et al. Green radio: radio techniques to enable energyefficient wireless networks [J]. IEEE Communication Magazine, 2011, 49(6): 46-54.
[15]QIU C, WU F, YE Y, et al. Energyefficient subcarrier allocation for downlink OFDMA wireless network [C]// Testbeds and Research Infrastructures for the Development of Networks & Communities. Berlin: Springer, 2014: 251-260.
[16]XIONG C, ZHANG S, CHEN Y, et al. Energyefficient resource allocation in OFDMA networks [J]. IEEE Transactions on Communications, 2012, 60(12): 3767-3778.
[17]NIU Z, WU Y, GONG J,et al. Cell zooming for costefficient green cellular networks [J]. IEEE Communications Magazine, 2010, 48(11): 74-79.