  In this paper, we consider a heterogenous network (HetNet), where low-power
indoor femtocells are deployed in the coverage area of the existing macro base
station (MBS). This paper proposes a novel coordinated random beamforming and
user scheduling strategy to improve the throughput of users served by the
femtocell access point (FAP) while satisfying the quality-of-service (QoS)
requirements of users served by both MBS and FAP. The strategy, termed as
QoS-Aware Coodinated Scheduling (QACS), requires limited coordination between
the MBS and FAP, i.e., only the indexes of the qualified beams are shared.
Exact statistical analysis for the ergodic achievable rate of both FAP and MBS
with the proposed strategy are presented. Scheduling fairness is also addressed
for the proposed QACS.
