A Mathematical Framework to Evaluate Flexible Outdoor User Association in Urban Two-Tier Cellular Networks

作者：Fereydooni Mehdi; Sabaei Masoud^*; Dehghan Mehdi; Taranetz Martin; Rupp Markus

来源：IEEE Transactions on Wireless Communications, 2018, 17(3): 1559-1573.

DOI：10.1109/TWC.2017.2780824

• Urban environment
• outdoor user
• building blockage
• random object process
• biased user association

In this paper, we present a mathematical framework to evaluate the performance of a typical outdoor user in an urban two-tier mobile network under a biased user association. The urban environment is abstracted by a Boolean scheme of blockages, which affects the deployment of outdoor base stations (BSs) and indoor small cell BSs, and the signal propagation characteristics of the wireless channels. A building is served by an indoor small cell BS with a certain probability, which we denote as occupation probability. Employing tools from stochastic geometry, we derive mathematical expressions for the coverage probability and the average spectral efficiency of a typical outdoor user. Numerical evaluations are carried out with the third generation partnership project compliant outdoor BS scenarios. Our results show that the increasing blockage density has a negative impact on the spectral efficiency in sparse outdoor BSs scenarios, but it has a positive impact on the performance of the network in dense outdoor BSs scenarios. We build our analysis on several assumptions, which are verified by extensive Monte Carlo simulations.

• 出版日期2018-3