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Two-Level Scheduling for Video Transmission over Downlink OFDMA Networks

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  • Mau-Luen Tham
  • Chee-Onn Chow
  • Yi-Han Xu
  • Nordin Ramli

Abstract

This paper presents a two-level scheduling scheme for video transmission over downlink orthogonal frequency-division multiple access (OFDMA) networks. It aims to maximize the aggregate quality of the video users subject to the playback delay and resource constraints, by exploiting the multiuser diversity and the video characteristics. The upper level schedules the transmission of video packets among multiple users based on an overall target bit-error-rate (BER), the importance level of packet and resource consumption efficiency factor. Instead, the lower level renders unequal error protection (UEP) in terms of target BER among the scheduled packets by solving a weighted sum distortion minimization problem, where each user weight reflects the total importance level of the packets that has been scheduled for that user. Frequency-selective power is then water-filled over all the assigned subcarriers in order to leverage the potential channel coding gain. Realistic simulation results demonstrate that the proposed scheme significantly outperforms the state-of-the-art scheduling scheme by up to 6.8 dB in terms of peak-signal-to-noise-ratio (PSNR). Further test evaluates the suitability of equal power allocation which is the common assumption in the literature.

Suggested Citation

  • Mau-Luen Tham & Chee-Onn Chow & Yi-Han Xu & Nordin Ramli, 2016. "Two-Level Scheduling for Video Transmission over Downlink OFDMA Networks," PLOS ONE, Public Library of Science, vol. 11(2), pages 1-15, February.
  • Handle: RePEc:plo:pone00:0148625
    DOI: 10.1371/journal.pone.0148625
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    Cited by:

    1. Byung Moo Lee & You Seung Rim & Wonjong Noh, 2017. "A combination of selected mapping and clipping to increase energy efficiency of OFDM systems," PLOS ONE, Public Library of Science, vol. 12(10), pages 1-25, October.
    2. Jaeyoung Park & Yusik Yang & Jaekwon Kim, 2019. "Unequal error protection technique for video streaming over MIMO-OFDM systems," PLOS ONE, Public Library of Science, vol. 14(1), pages 1-18, January.

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