An Admission Control Strategy for Soft Frequency Reuse Deployment of LTE Systems

Abstract

For UTRAN Long Tenn Evolution (LTE) systems, inter-cell interference is the most important interference source. Inter-cell interference coordination (ICIC) is considered to improve coverage and increase data rate at cell edge. The current consensus of ICIC scheme is towards semi-static soft frequency reuse (SFR). Due to the limitation of resource configuration way for semi-statci SFR, problems will be met when applying the traditional admission control strategy to semi-static SFR deployment. In this paper, we have investigated the joint design of SFR and the corresponding call admission control strategy. A scheme is proposed which affords a new resource configuration strategy for SFR and an admission control algorithm which takes full account of the frequency planning of SFR and makes coordination among different cell zones or neighboring cells. Simulation results show that the proposed scheme can achieve good perfonnance in tenns of blocking probability, handover outage and resource utilization.