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The heterogeneity in cellular networks that comprise multiple base stationstypes imposes new challenges in network planning and deployment of futuregeneration of cellular networks. The Radio Resource Management (RRM)techniques, such as dynamic sharing of the available resources and advanceduser association strategies, determine the overall network capacity andefficiency. This paper evaluates the downlink performance of a two tierheterogeneous network (consisting of macro and femto tiers) in terms of ratedistribution, i.e. the percentage of users that achieve certain rate in thesystem. The paper specifically addresses the femto tier RRM by randomization ofthe allocated resources and the user association process by introducing amodified SINR association strategy with bias factor for load balancing. Also,the paper introduces hybrid access control mechanism at the femto tier thatallows the authorized users of the femtocell, which are part of the ClosedSubscriber Group (CSG) on the femtocell, to achieve higher data rates up to 10times compared to the other regular users associated in the access.

Hybrid access control with modified SINR association for future heterogeneous networks