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HETEROGENEOUS NETWORKS SPECTRAL EFFICIENCY ANALYSIS WITH MODIFIED TIME-DOMAIN INTERFERENCE COORDINATION ALGORITHM IN VARIOUS LOAD DISTRIBUTION SCENARIOS FOR 5G NEW RADIO
Roman V. Glazkov, The Bonch-Bruevich Saint-Petersburg State University of Telecomminications, Saint-Petersburg, Russia;
University of Jyvaskyla, Finland, roman.v.glazkov@gmail.com
Alexandra V. Nikitina, The Bonch-Bruevich Saint-Petersburg State University of Telecomminications, Saint-Petersburg, Russia, envision@yandex.ru
Abstract
The provision of required normalized throughput on cell edges and areas with insufficient signal strength can be achieved by heterogeneous networks establishment. The key problem of these systems is a cross-tier interference between macrocells and smallcells which should be diminished. One of the common methods to cope with the channel resource shortage is the load balancing. In homogeneous networks users connect to the base station providing the maximum SINR level. In HetNets it leads to a traffic disbalance as the cells with weak transmit power (picocell and femtocell) are chosen as serving cells only with very close range UEs or not chosen at all. In such situation Cell Range Expression (CRE) technique is used. The main idea of CRE is to artificially increase SINR level from weak cells by several dB (3 — 4 dB for LTE Release 10 and above) [2]. Terminals in range expansion zone experience low downlink SINR and control channels failure may occur. Therefore a total spectral efficiency increase task becomes a challenging problem. The aim of this paper is to estimate cell-edge spectral efficiency in heterogeneous networks (HetNets) reducing cross-tier interference with Almost Blank Subframes (ABS) for 5G New Radio applications. Two situations of user traffic are considered: both macro- and small cells are overloaded or only small cell is underloaded. To detect ABS density in each of the described scenarios modified time-domain Interference Coordination algorithm is used [1]. This solution is designed to improve overall system performance evaluating the number of victim users and optimal ABS density by means of utility function maximization. The network model was built in ns-3 discrete event network framework. Cumulative distribution functions (CDFs) of normalized throughput are calculated in various load distribution cases. The results obtained within the proposed approach are given and discussed.
Keywords:5G New Radio, Spectral Efficiency, Interference Coordination, HetNet, ABS.
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