[1] [1] PASSAS V,MILIOTIS V,MAKRIS N,et al. Pricing based distributed traffic allocation for 5G heterogeneous networks[J]. IEEE Transactions on Vehicular Technology, 2020,69(10):12111-12123. doi:10.1109/TVT.2020.3012189.

[2] [2] SHAMAEI S, BAYAT S, HEMMATYAR A M A. Interference management in D2D-enabled heterogeneous cellular networks using matching theory[J]. IEEE Transactions on Mobile Computing, 2019,18(9):2091-2102. doi:10.1109/TMC.2018.2871073.

[3] [3] WANG Xueting, ZHU Qi. Fairness based macro base station power control algorithm in heterogeneous cellular networks[C]// 2016 the 8th International Conference on Computational Intelligence and Communication Networks(CICN). Tehri, India: IEEE, 2016:82-86. doi:10.1109/CICN.2016.23.

[4] [4] GALININA O, PYATTAEV A, ANDREEV S, et al. 5G multi-RAT LTE-WiFi ultra-dense small cells: performance dynamics, architecture, and trends[J]. IEEE Journal on Selected Areas in Communications, 2015, 33(6): 1224-1240. doi: 10.1109/JSAC. 2015.2417016.

[6] [6] SHAMI T M,GRACE D,BURR A. Load balancing and control using particle swarm optimisation in 5G heterogeneous networks[C]// 2018 European Conference on Networks and Communications(EuCNC). Ljubljana, Slovenia: IEEE, 2018: 1-9. doi: 10.1109/ EuCNC.2018.8442519.

[7] [7] CHEN Changshan, ZHAO Xinsheng, YUAN Jide. Coverage analysis of inter-tier interference cancellation for massive MIMO HetNet with repulsion[J]. IEEE Communications Letters, 2019,23(2):350-353. doi:10.1109/LCOMM.2018.2889328.

[8] [8] KASSIM A Y,TEKANYI A M S,ABDULKAREEM H A,et al. An improved cross-tier interference mitigation scheme in a femto- macro heterogeneous network[J]. Journal of Electrical Engineering and Technology, 2020,9(1):62-70.