Equalization of packet delays in OFDMA scheduling of real-time video calls

Alexander X. Han, I-Tai Lu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper studies the scheduling of multiple real-time unicast videos (e.g. video calls) over the Orthogonal Frequency Division Multiple Access (OFDMA) air interface. Modified Largest Weighted Deadline First (M-LWDF) and Exponential Rule (EXP) were proposed to schedule traffic with quality-of-service constraints in shared-channel systems. Both have been proven to be throughput optimal and EXP also possesses delay optimality in a sense. This paper proposes several techniques that modify M-LWDF to further improve users' 99% packet delays over M-LWDF and EXP. An interesting phenomenon of simultaneous reduction in latencies and bandwidth usages is demonstrated in various comparisons, which contradicts with the conventional observation that giving unequal weights to users sacrifices spectral efficiency. Our study shows that a better scheduling policy often improves both spectral efficiency and user latencies simultaneously in the scheduling of real-time traffic. Under the same user latency constraints, the proposed scheduler also improves the Peak-Signal-to-Noise-Ratio (PSNR) of received videos considerably under moderate system load.

Original languageEnglish (US)
Title of host publication2010 Military Communications Conference, MILCOM 2010
Pages1547-1552
Number of pages6
DOIs
StatePublished - 2011
Event2011 IEEE Military Communications Conference, MILCOM 2011 - Baltimore, MD, United States
Duration: Nov 7 2011Nov 10 2011

Other

Other2011 IEEE Military Communications Conference, MILCOM 2011
CountryUnited States
CityBaltimore, MD
Period11/7/1111/10/11

Fingerprint

Frequency division multiple access
Scheduling
Telecommunication traffic
Signal to noise ratio
Quality of service
Throughput
Bandwidth
Air

Keywords

  • 99% packet delay
  • delay equalization
  • EXP rule
  • H.264/AVC
  • latency
  • M-LWDF
  • OFDMA
  • PSNR
  • QoS
  • real-time
  • scheduling
  • video calls

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Han, A. X., & Lu, I-T. (2011). Equalization of packet delays in OFDMA scheduling of real-time video calls. In 2010 Military Communications Conference, MILCOM 2010 (pp. 1547-1552). [6127527] https://doi.org/10.1109/MILCOM.2011.6127527

Equalization of packet delays in OFDMA scheduling of real-time video calls. / Han, Alexander X.; Lu, I-Tai.

2010 Military Communications Conference, MILCOM 2010. 2011. p. 1547-1552 6127527.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Han, AX & Lu, I-T 2011, Equalization of packet delays in OFDMA scheduling of real-time video calls. in 2010 Military Communications Conference, MILCOM 2010., 6127527, pp. 1547-1552, 2011 IEEE Military Communications Conference, MILCOM 2011, Baltimore, MD, United States, 11/7/11. https://doi.org/10.1109/MILCOM.2011.6127527
Han AX, Lu I-T. Equalization of packet delays in OFDMA scheduling of real-time video calls. In 2010 Military Communications Conference, MILCOM 2010. 2011. p. 1547-1552. 6127527 https://doi.org/10.1109/MILCOM.2011.6127527
Han, Alexander X. ; Lu, I-Tai. / Equalization of packet delays in OFDMA scheduling of real-time video calls. 2010 Military Communications Conference, MILCOM 2010. 2011. pp. 1547-1552
@inproceedings{d4347f88dec146cca2d0f720eaf16c6b,
title = "Equalization of packet delays in OFDMA scheduling of real-time video calls",
abstract = "This paper studies the scheduling of multiple real-time unicast videos (e.g. video calls) over the Orthogonal Frequency Division Multiple Access (OFDMA) air interface. Modified Largest Weighted Deadline First (M-LWDF) and Exponential Rule (EXP) were proposed to schedule traffic with quality-of-service constraints in shared-channel systems. Both have been proven to be throughput optimal and EXP also possesses delay optimality in a sense. This paper proposes several techniques that modify M-LWDF to further improve users' 99{\%} packet delays over M-LWDF and EXP. An interesting phenomenon of simultaneous reduction in latencies and bandwidth usages is demonstrated in various comparisons, which contradicts with the conventional observation that giving unequal weights to users sacrifices spectral efficiency. Our study shows that a better scheduling policy often improves both spectral efficiency and user latencies simultaneously in the scheduling of real-time traffic. Under the same user latency constraints, the proposed scheduler also improves the Peak-Signal-to-Noise-Ratio (PSNR) of received videos considerably under moderate system load.",
keywords = "99{\%} packet delay, delay equalization, EXP rule, H.264/AVC, latency, M-LWDF, OFDMA, PSNR, QoS, real-time, scheduling, video calls",
author = "Han, {Alexander X.} and I-Tai Lu",
year = "2011",
doi = "10.1109/MILCOM.2011.6127527",
language = "English (US)",
isbn = "9781467300810",
pages = "1547--1552",
booktitle = "2010 Military Communications Conference, MILCOM 2010",

}

TY - GEN

T1 - Equalization of packet delays in OFDMA scheduling of real-time video calls

AU - Han, Alexander X.

AU - Lu, I-Tai

PY - 2011

Y1 - 2011

N2 - This paper studies the scheduling of multiple real-time unicast videos (e.g. video calls) over the Orthogonal Frequency Division Multiple Access (OFDMA) air interface. Modified Largest Weighted Deadline First (M-LWDF) and Exponential Rule (EXP) were proposed to schedule traffic with quality-of-service constraints in shared-channel systems. Both have been proven to be throughput optimal and EXP also possesses delay optimality in a sense. This paper proposes several techniques that modify M-LWDF to further improve users' 99% packet delays over M-LWDF and EXP. An interesting phenomenon of simultaneous reduction in latencies and bandwidth usages is demonstrated in various comparisons, which contradicts with the conventional observation that giving unequal weights to users sacrifices spectral efficiency. Our study shows that a better scheduling policy often improves both spectral efficiency and user latencies simultaneously in the scheduling of real-time traffic. Under the same user latency constraints, the proposed scheduler also improves the Peak-Signal-to-Noise-Ratio (PSNR) of received videos considerably under moderate system load.

AB - This paper studies the scheduling of multiple real-time unicast videos (e.g. video calls) over the Orthogonal Frequency Division Multiple Access (OFDMA) air interface. Modified Largest Weighted Deadline First (M-LWDF) and Exponential Rule (EXP) were proposed to schedule traffic with quality-of-service constraints in shared-channel systems. Both have been proven to be throughput optimal and EXP also possesses delay optimality in a sense. This paper proposes several techniques that modify M-LWDF to further improve users' 99% packet delays over M-LWDF and EXP. An interesting phenomenon of simultaneous reduction in latencies and bandwidth usages is demonstrated in various comparisons, which contradicts with the conventional observation that giving unequal weights to users sacrifices spectral efficiency. Our study shows that a better scheduling policy often improves both spectral efficiency and user latencies simultaneously in the scheduling of real-time traffic. Under the same user latency constraints, the proposed scheduler also improves the Peak-Signal-to-Noise-Ratio (PSNR) of received videos considerably under moderate system load.

KW - 99% packet delay

KW - delay equalization

KW - EXP rule

KW - H.264/AVC

KW - latency

KW - M-LWDF

KW - OFDMA

KW - PSNR

KW - QoS

KW - real-time

KW - scheduling

KW - video calls

UR - http://www.scopus.com/inward/record.url?scp=84856970145&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84856970145&partnerID=8YFLogxK

U2 - 10.1109/MILCOM.2011.6127527

DO - 10.1109/MILCOM.2011.6127527

M3 - Conference contribution

SN - 9781467300810

SP - 1547

EP - 1552

BT - 2010 Military Communications Conference, MILCOM 2010

ER -