The success of LTE heterogeneous
networks (Het Nets) with macro cells and Pico cells critically depends on
efficient spectrum sharing between high-power macros and low-power Picos. Two
important challenges in this context are: 1) determining the amount of radio
resources that macro cells should offer to Pico cells, and 2) determining the
association rules that decide which user equipments (UEs) should associate with
picos. In this paper, we develop a novel algorithm to solve these two coupled
problems in a joint manner. Our algorithm has provable guarantee, and
furthermore, it accounts for network topology, traffic load, and macro Pico
interference map. Our solution is standard compliant and can be implemented
using the notion of Almost Blank Sub frames (ABS) and Cell Selection Bias (CSB)
proposed by LTE standards. We also show extensive evaluations using RF plan
from a real network and discuss self-optimized networking (SON)-based enhanced
inter-cell interference coordination (EICIC) implementation.
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