Facing to wireless network densification in 6G: Challenges and opportunities

Andrews, 2014, What will 5G be?, IEEE J. Sel. Areas Commun., 32, 1065, 10.1109/JSAC.2014.2328098 Ge, 2016, 5G ultra-dense cellular networks, IEEE Trans. Wireless Commun., 23, 72, 10.1109/MWC.2016.7422408 Zhang, 2020 Bhushan, 2014, Network densification: The dominant theme for wireless evolution into 5G, IEEE Commun. Mag., 52, 82, 10.1109/MCOM.2014.6736747 B. Romanous, N. Bitar, A. Imran, H. Refai, Network densification: Challenges and opportunities in enabling 5G, in: 2015 IEEE 20th International Workshop on Computer Aided Modelling and Design of Communication Links and Networks, CAMAD, Guildfood, UK, 2015. Gupta, 2021, Fundamentals of network densification, 129 Jiang, 2021, The road towards 6G: A comprehensive survey, IEEE Open J. Commun. Soc., 2, 334, 10.1109/OJCOMS.2021.3057679 Index, 2019, 2017 Yang, 2019, 6G wireless communications: Vision and potential techniques, IEEE Network., 33, 70, 10.1109/MNET.2019.1800418 Sharma, 2019, Toward massive machine type communications in ultra-dense cellular IoT networks: Current issues and machine learning-assisted solutions, IEEE Commun. Surveys Tuts., 21 Wu, 2020, Massive access for future wireless communication systems, IEEE Wireless Commun., 27, 148, 10.1109/MWC.001.1900494 2012 Al-Hourani, 2014, Optimal LAP altitude for maximum coverage, IEEE Wireless Commun. Lett., 3, 569, 10.1109/LWC.2014.2342736 Cho, 2018, Impact of elevated base stations on the ultra-dense networks, IEEE Commun. Lett., 22, 1268, 10.1109/LCOMM.2018.2824801 Kim, 2020, Multi-layer unmanned aerial vehicle networks: Modeling and performance analysis, IEEE Trans. Wireless Commun., 19, 325, 10.1109/TWC.2019.2944378 Yaacoub, 2020, A key 6G challenge and opportunity–connecting the base of the pyramid: A survey on rural connectivity, Proc. IEEE., 108, 533, 10.1109/JPROC.2020.2976703 Pan, 2019, Joint 3D UAV placement and resource allocation in software-defined cellular networks with wireless backhaul, IEEE Access, 7, 104279, 10.1109/ACCESS.2019.2927521 Jiang, 2022, Wireless fronthaul for 5G and future radio access networks: Challenges and enabling technologies, IEEE Wireless Commun., 29, 108, 10.1109/MWC.003.2100482 Tse, 2005 Polese, 2020, Integrated access and backhaul in 5G mmwave networks: Potential and challenges, IEEE Commun. Mag., 58, 62, 10.1109/MCOM.001.1900346 N.H. Mahmood, H. Alves, O.A. López, M. Shehab, D.P.M. Osorio, M. Latva-Aho, Six key features of machine type communication in 6G, in: 2020 2nd 6G Wireless Summit, 6G SUMMIT, Levi, Finland, 2020, pp. 1–5. Chen, 2021, Massive access for 5G and beyond, IEEE J. Sel. Areas Commun., 39, 615, 10.1109/JSAC.2020.3019724 Jha, 2021, Online downlink multi-user channel estimation for mmwave systems using Bayesian neural network, IEEE J. Sel. Areas Commun., 39, 2104, 10.1109/JSAC.2021.3087249 A. Wang, Y. Wang, L. Jiang, Improved sparse channel estimation for multi-user massive MIMO systems with compressive sensing, in: 2015 International Conference on Wireless Communications & Signal Processing, WCSP, Nanjing, China, 2015. C. Chen, R.A. Berry, M.L. Honig, V.G. Subramanian, Bandwidth optimization in hetnets with competing service providers, in: 2015 IEEE Conf. Comput. Commun. Workshops, INFOCOM WKSHPS, Hong Kong, China, 2015, pp. 1–6. Tang, 2015, Resource allocation for energy efficiency optimization in heterogeneous networks, IEEE J. Sel. Areas Commun., 33, 2104, 10.1109/JSAC.2015.2435351 Akyildiz, 2020, 6G and beyond: The future of wireless communications systems, IEEE Access, 8, 133995, 10.1109/ACCESS.2020.3010896 Tanbourgi, 2014, A tractable model for noncoherent joint-transmission base station cooperation, IEEE Trans. Wireless Commun., 13, 4959, 10.1109/TWC.2014.2340860 Nigam, 2014, Coordinated multipoint joint transmission in heterogeneous networks, IEEE Trans. Commun., 62, 4134, 10.1109/TCOMM.2014.2363660 Mukherjee, 2021, Base station coordination scheme for multi-tier ultra-dense networks, IEEE Trans. Wireless Commun., 20, 7317, 10.1109/TWC.2021.3082625 Zhou, 2019, Deep learning-based beam management and interference coordination in dense mm Wave networks, IEEE Trans. Veh. Technol., 68, 592, 10.1109/TVT.2018.2882635 Zhan, 2021, Interference cancellation aided hybrid beamforming for mmwave multi-user massive MIMO systems, IEEE Trans. Veh. Technol., 70, 2322, 10.1109/TVT.2021.3057547 Liu, 2020, Joint transmit beamforming for multiuser MIMO communications and MIMO radar, IEEE Trans. Signal Process., 68, 3929, 10.1109/TSP.2020.3004739 Iimori, 2019, MIMO beamforming schemes for hybrid SIC FD radios with imperfect hardware and CSI, IEEE Trans. Wireless Commun., 18, 4816, 10.1109/TWC.2019.2929759 C. Park, S. Mukherjee, J. Lee, Base station activation in coordinated multi-pointJoint transmission-based ultra dense networks, in: 2021 IEEE Global Telecomm. Conf. Wkshps, San Diego, CA, USA, 2015. Park, 2021, Mobile edge computing-enabled heterogeneous networks, IEEE Trans. Wireless Commun., 20, 1038, 10.1109/TWC.2020.3030178 J. Xu, L. Chen, P. Zhou, Joint service caching and task offloading for mobile edge computing in dense networks, in: 2018 IEEE INFOCOM, Honolulu, HI, USA, 2018. Kim, 2021 Zhang, 2016, Fronthauling for 5G LTE-U ultra dense cloud small cell networks, IEEE Network, 23, 48 Nguyen, 2018, Designing wireless backhaul heterogeneous networks with small cell buffering, IEEE Trans. Commun., 66, 4596