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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 effi-
ciency increase task becomes a challenging problem.
The aim of this paper is to estimate cell-edge spectral efficiency in heteroge-
neous 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 vic-
tim 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 calcu-
lated in various load distribution cases. The results obtained within the pro-
posed approach are given and discussed.
Roman V. Glazkov, 
The Bonch-Bruevich Saint-Petersburg State University 
of Telecomminications, Saint-Petersburg, Russia;
University of Jyvaskyla, Finland,
[e-mail]
Alexandra V. Nikitina, 
The Bonch-Bruevich Saint-Petersburg State University 
of Telecomminications, Saint-Petersburg, Russia,