Impact of user mobility on the performance of downlink resource scheduling in Heterogeneous LTE cellular networks

In LTE, resource scheduling algorithm is one of the key parameters that determine the overall system and UE performances in terms of throughput and fairness respectively. Multiple scheduling techniques are available that emphasizes on optimizing any one of the key system performance parameters. Among them the most potential algorithms are proportional fair (PF) and round robin (RR). PF optimizes UE throughput with a fairly high fairness index whereas RR provides the best fairness among the UEs but with a comparatively lower throughput. Moreover the scheduler performance is affected by the UE mobility and UE density. This can significantly degrade the overall system efficiency. In this paper we have analyzed and compared several LTE downlink performance parameters between PF and RR in heterogeneous network (HetNet) to determine which scheduling scheme is convenient for users with high mobility.