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Analysis of Dual Connectivity for Downlink Access in 5G Heterogeneous Network

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Abstract

Dual-Connectivity architecture allows each user’s equipment (UE) to simultaneously communicate with two kinds of serving base stations (BSs) via two different radio-interfaces. Dual-Connectivity paradigm emerges as a promising solution to boost system capacity in fifth-generation heterogeneous network (HetNet), deploying multiple kinds of BSs, such as Femto BSs (FBSs), Pico BSs (PBSs) and Macro BSs (MBSs). In this paper, a comprehensive study of Dual-Connectivity in the downlink HetNet is analyzed via the framework of stochastic geometry, where the deployments of the BSs are modeled as mutually independent homogeneous Poisson point processes. In the conventional Dual-Connectivity, only the combination of MBS and SBS is available to access. In this paper, we consider that each UE can be simultaneously associated with any two types of BSs. The analysis is divided into two parts. We first derive the association probabilities of different combinations for Dual-Connectivity and then evaluate the average downlink throughput with the help of the association probabilities and the distance distributions to the serving BS. Moreover, we analyze the impact of the relative density of FBSs (or PBSs) on the association probabilities of different cases. Also, we compare the average downlink throughput of our considered Dual-Connectivity with those of conventional Dual-Connectivity and single association. Numerical results prove the validity of the theoretical analyses and demonstrate that our considered Dual-Connectivity owns superior performance on the throughput in HetNet, especially in the dense deployed SBS HetNet.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (No. 61531013), the National Science and Technology Major Project of China (No. 2018ZX03001016) and the Research Fund of Ministry of Education-China Mobile under Grant No. MCM20150102.

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Authors and Affiliations

  1. School of Electronic and Information Engineering, Xi’an Jiaotong University, No. 28, Xianning West Road, Xi’an, 710049, Shaanxi, People’s Republic of China

    Youwei Shi, Hua Qu, Jihong Zhao & Gongye Ren

  2. School of Telecommunication and Information Engineering, Xi’an University of Posts and Telecommunications, No. 563, Chang’an South Road, Xi’an, 710121, Shaanxi, People’s Republic of China

    Jihong Zhao

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  1. Youwei Shi
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  2. Hua Qu
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Correspondence to Youwei Shi.

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Shi, Y., Qu, H., Zhao, J. et al. Analysis of Dual Connectivity for Downlink Access in 5G Heterogeneous Network. Wireless Pers Commun 102, 309–323 (2018). https://doi.org/10.1007/s11277-018-5841-z

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