1Soldani D, Manzalini A. Horizon 2020 and beyond: On the 5G operating system for a true digital society[J]. IEEE Vehicular Technology Magazine, 2015, 10(1): 32-42.
2Wu Y, Chen Y, Tang J, So D, et al. Green transmission technologies for balancing the energy efficiency and spectrum effi- ciency trade-off[J]. IEEE Communications Magazine, 2014, 52(11): 112-120.
3Cavaleante R, Sta ezak S, Schubert M, et al. Toward energy-efficient 5G wireless communications technologies[J]. IEEE Signal Processing Magazine, 2014, 31(6): 24-34.
4Ghosh A, Mangalvedhe N, Ratasuk R, et al. Heterogeneous cellular networks: From theory to practice[J]. IEEE Commu- nications Magazine, 2012, 50(6): 54-64.
5Zhang X, Cheng W, Zhang H. Heterogeneous statistical QoS provisioning over 5G mobile wireless networks[J]. IEEE Net- work, 2014, 28(6): 46-53.
6Sabellal D, Domenico A, Katranaras E,et al. Energy efficiency benefits of RAN-as-a-Service concept for a cloud-based 5 G mobile network infrastructure[J]. IEEE Access, 2014, 2: 1586-1697.
7Larsson E, Edfors O, Tu{vesson F, et al. Massive MIMO for next generation wireless systems[J]. IEEE Communications Magazine, 2014, 52(2): 186-195.
8Imran A, Zoha A, Abu-Dayya A. Challenges in 5G: How to empower SON with big data for enabling 5 G[J]. IEEE Net- work, 2014, 28(6): 27-33. .
9Wei L, Hu R, Qian Y, et al. Key elements to enable millimeter wave communications for 5 G wireless systems[J]. IEEE Wireless Communications, 2014, 21(6): 136-143.
10Madan R, Borran J, Sampath A, et al. Cell association and interference coordination in heterogeneous LTE-A cellular net- works[J]. IEEE Journal on Selected Areas in Communications, 2010, 28(9) : 1479-1489.
