Multi-Antenna Antenna Transmission in Downlink Heterogeneous Cellular Networks Under A Threshold Threshold-Based Based Mobile Association Policy
Abstract: With the recent emergence of 5G era, heterogeneous cellular networks (HCNs) have invoked a popular research interest. In this paper, we provide a comprehensive analysis for multi multi-antenna antenna transmissions in a multi-tier multi downlink HCN. We first propose a reliability reliability-oriented threshold-based based mobile association policy, where each user connects to the strongest base station from which whi this user can obtain the largest truncated long long-term term received power. Under our mobile association policy, we derive analytical expressions for the exact outage probability of an arbitrary randomly located user, along with computationally convenient lowerr and upper bounds. Asymptotic analysis on the outage probability shows that introducing a large access threshold into mobile association significantly decreases the outage probability. We further investigate the spectrum efficiency and the energy efficien efficiency cy of the HCN. Our theoretic analysis and numerical validations show that both the spectrum and energy efficiencies can be improved by properly choosing the access threshold.