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An Adaptive FEC Mechanism Using Cross-layer Approach to Enhance Quality of Video Transmission over 802.11 WLANs

Authors
Han, LongzhePark, SungjunKang, Seung-SeokIn, Hoh Peter
Issue Date
30-6월-2010
Publisher
KSII-KOR SOC INTERNET INFORMATION
Keywords
Forward error correction; cross-layer; video streaming; wireless networks
Citation
KSII TRANSACTIONS ON INTERNET AND INFORMATION SYSTEMS, v.4, no.3, pp.341 - 357
Indexed
SCIE
SCOPUS
KCI
OTHER
Journal Title
KSII TRANSACTIONS ON INTERNET AND INFORMATION SYSTEMS
Volume
4
Number
3
Start Page
341
End Page
357
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/116212
DOI
10.3837/tiis.2010.06.009
ISSN
1976-7277
Abstract
Forward Error Correction (FEC) techniques have been adopted to overcome packet losses and to improve the quality of video delivery. The efficiency of the FEC has been significantly compromised, however, due to the characteristics of the wireless channel such as burst packet loss, channel fluctuation and lack of Quality of Service (QoS) support. We propose herein an Adaptive Cross-layer FEC mechanism (ACFEC) to enhance the quality of video streaming over 802.11 WLANs. Under the conventional approaches, FEC functions are implemented on the application layer, and required feedback information to calculate redundancy rates. Our proposed ACFEC mechanism, however, leverages the functionalities of different network layers. The Automatic Repeat reQuest (ARQ) function on the Media Access Control ( MAC) layer can detect packet losses. Through cooperation with the User Datagram Protocol (UDP), the redundancy rates are adaptively controlled based on the packet loss information. The experiment results demonstrate that the ACFEC mechanism is able to adaptively adjust and control the redundancy rates and, thereby, to overcome both of temporary and persistent channel fluctuations. Consequently, the proposed mechanism, under various network conditions, performs better in recovery than the conventional methods, while generating a much less volume of redundant traffic.
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