Uplink QoS Scheduling Algorithm with Delay Estimation for LTE Systems

Abstract

In this paper, we propose a quality of service (QoS) uplink scheduling algorithm for long term evolution (LTE) that collaborates with delay estimation. Unlike downlink scheduling, uplink scheduling cannot incorporate packet delay information due to specification constraints of LTE. The limited information results in difficulty ensuring QoS when conventional scheduling algorithms are employed. To overcome the limitation in QoS scheduling, we estimate delays taking into account buffer status reports (BSRs) of LTE and propose an uplink QoS scheduling scheme with delay estimation. For given system parameters, such as BSR period, an optimal parameter for estimation is also proposed and analyzed. Via simulations, we show that the proposed QoS scheduling scheme can reduce the number of unsatisfied QoS services by half, even with a simple estimation.