Title: Delay threshold scheduling algorithm for LTE downlink systems

Authors: Fu-Min Chang; Hsiu-Lang Wang; Po-Hsueh Wang; Shang-Juh Kao

Addresses: Department of Finance, Chaoyang University of Technology, 168, Jifeng E. Rd., Wufeng District, Taichung, Taiwan ' Computer and Communication Centre, Taichung Veterans General Hospital, Taiwan Boulevard Sect. 4, Taichung, Taiwan ' Department of Computer Science and Engineering, National Chung-Hsing University, 250 Kuo Kuang Rd., Taichung, Taiwan ' Department of Computer Science and Engineering, National Chung-Hsing University, 250 Kuo Kuang Rd., Taichung, Taiwan

Abstract: This paper proposes a delay threshold scheduling (DTS) algorithm for the scheduling of requests in real-time multimedia applications using LTE downlink systems, which takes into account channel conditions as well as the packet waiting time. Delay thresholds were adopted to enable the differentiation of packets in conjunction with proportional weighting between channel conditions and packet waiting time for the prioritisation of real-time services. Simulation results demonstrate that compared to the results obtained using Modified Largest Weighted Delay First (M-LWDF), Exponential Proportional Fair (EXP/PF), and Channel Dependent Earliest Due Date (CD-EDD), the proposed DTS algorithm is able to increase video traffic throughput and decrease packet delays and the packet loss ratio for real-time services.

Keywords: radio horizon; irregular terrain modelling; path loss; earth bulge; two-ray ground reflection model; radio propagation.

DOI: 10.1504/IJWMC.2020.108524

International Journal of Wireless and Mobile Computing, 2020 Vol.18 No.4, pp.320 - 331

Accepted: 18 Aug 2019
Published online: 03 Jul 2020 *

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