Algorithm for CSG aware scheduling in LTE systems

Abstract

Long Term Evolution (LTE) technology aims for high data rate transmission in the order of several hundreds of Mbps. LTE standard delivers variety of Quality of Service (QoS) options, which enable to provide multiple services to the User Equipment (UE). Small cells are the miniature version of base stations, which are being deployed in public and private areas to provide uninterrupted connectivity to the UEs. In such deployment scenarios, the major requirement is to prioritize the users in Closed Subscriber Group (CSG) for providing the better QoS. The scheduler allocates the Resource Blocks (RB) to the selected UEs based on their QoS requirements. A novel scheduling algorithm is proposed in this paper for prioritizing CSG users having Non-Guaranteed Bit Rate (N-GBR) bearers to have better data rate connectivity. In the proposed scheme, the logic for selection of UEs in a TTI and allocation of RBs are varied based on the CSG weight index. Real time results reveal that the proposed scheme provides the significant performance gain in terms of fairness among CSG users for different channel conditions.