Call Admission Control in Fractional Frequency Reuse‐Based Two‐Tier Networks

In a cellular network, call admission control (CAC) is responsible for admission or rejection of an incoming request from a UE into the network based on some predefined criteria while taking the network load conditions and QoS requirements of both incoming and existing users into account. This chapter presents a CAC method for a two‐tier macrocell‐femtocell network which uses a sector‐based FFR for spatial channel allocation for macrocells and femtocells. The CAC method takes into account all types of calls in a two‐tier network along with random mobility of the UEs. A CAC model is developed that captures both co‐tier interference and CTI. The performance evaluation results for the proposed CAC framework is provided in the end.