A Realistic Uplink–Downlink Coupled and Decoupled User Association Technique for K-tier 5G HetNets
- 22 Downloads
Cell association policies in present-day heterogeneous networks (HetNets) cannot promise fairness and high capacity to all network users. To optimize this cell association, concept of downlink (DL)–uplink (UL) decoupling (DUDe) has been introduced where uplink and downlink channels can be associated with two different base stations (BSs) instead of existing policy of being associated with same BS. For this decoupled access, a number of theoretical uplink or downlink analysis frameworks have been proposed. However, these frameworks do not fully take into account the practical realization aspects. In these preceding works, all network users are assumed to employ decoupled access despite the fact that it is not preferred by all users. These models also ignore noise to get simplified solutions which can result into practical inaccuracies. In this paper, we propose a realistic user association technique in which both coupled access and decoupled access are permissible to users, depending upon their location and benefits. Therefore, the goal of the present paper is to present K-tier uplink analysis framework for network devices that prefer decoupled access. Simple closed-form solutions without ignoring noise are presented, which relate user performance to number of HetNet tiers, base-station densities and power levels. Moreover, derived distributions are also employed to compare performance of DUDe case with existing process of coupled access. Finally, decoupling impacts on K-tier network design have been presented. Based on conducted analysis, it can be concluded that decoupling is beneficial and can be easily realized in 5G K-tier HetNets.
Keywords5G K-tier heterogeneous cellular networks Downlink and uplink decoupling User association Stochastic geometry
Unable to display preview. Download preview PDF.
- 7.Rost, P.; Maeder, A.; Pérez-Costa, X.: Asymmetric uplink–downlink assignment for energy-efficient mobile communication systems. In: IEEE 75th Vehicular Technology Conference, pp. 1–5 (2012)Google Scholar
- 8.Document TR 36.842, 3rd Generation Partnership Project (3GPP), Study on Small cell Enhancements for E-UTRA and E-UTRAN; Higher Layer Aspects (2013). http://www.3gpp.org/dynareport/36842.htm. Accessed 20 Jan 2017
- 11.Elshaer, H.; Boccardi, F.; Dohler, M.; Irmer, R.: Downlink and uplink decoupling: a disruptive architectural design for 5G networks. In: IEEE Global Communications Conference, pp. 1798–1803 (2014)Google Scholar
- 13.Smiljkovikj, K.; Gavrilovska, L.; Popovski, P.: Efficiency analysis of decoupled downlink and uplink access in heterogeneous networks. arXiv preprint arXiv:1412.1652 (2014)
- 14.Chiu, S.N.; Stoyan, D.; Kendall, W.S.; Mecke, J.: Stochastic geometry and its applications. John Wiley & Sons (2013)Google Scholar
- 15.Smiljkovikj, K.; Elshaer, H.; Popovski, P.; Boccardi, F.; Dohler, M.; Gavrilovska, L.; Irmer, R.: Capacity analysis of decoupled downlink and uplink access in 5G heterogeneous systems. arXiv preprint arXiv:1410.7270 (2014)
- 16.ElBamby, M.S.; Bennis, M.; Latva-aho, M.: UL/DL decoupled user association in dynamic TDD small cell networks. In: International Symposium on Wireless Communication Systems, pp. 456–460. IEEE (2015)Google Scholar
- 17.Sekander, S.; Tabassum, H.; Hossain, E.: Matching with externalities for decoupled uplink–downlink user association in full-duplex small cell networks. In: IEEE International WIE Conference on Electrical and Computer Engineering, pp. 411–414. IEEE (2015)Google Scholar
- 18.Sui, X.; Zhao, Z.; Li, R.; Zhang, H.: Energy efficiency analysis of heterogeneous cellular networks with downlink and uplink decoupling. In: IEEE GLOBECOM, pp. 1–7. IEEE (2015)Google Scholar
- 22.Singh, S.; Zhang, X.; Andrews, J.G.: Uplink rate distribution in heterogeneous cellular networks with power control and load balancing. In: 2015 ICCW, pp. 1275–1280 (2015)Google Scholar
- 26.Document TR 136.213, 3rd Generation Partnership Project (3GPP), LTE: Evolved Universal Terrestrial Radio Access E-UTRA; Physical Layer Procedures (2009). http://www.3gpp.org/dynareport/136213.htm. Accessed 29 July 2016