Paper Info
Title
Is physical layer error correction sufficient for video multicast over IEEE 802.11g networks?
Abstract
Wireless video multicast enables delivery of popular events to many mobile users in a bandwidth efficient manner. However, providing good and stable video quality to a large number of users with varying channel conditions remains elusive. A promising solution to this problem is the use of packet level Forward Error Correction (FEC) mechanisms. However, the adjustment of the FEC rate is not a trivial issue due to the dynamic wireless environment. This decision becomes more complicated if we consider the multi-rate capability of the existing wireless LAN technology that adjusts the transmission rates based on the channel conditions and the coverage range. In this paper, we explore the dynamics of Forward Error Correction (FEC) schemes in multi-rate wireless local area networks. We study the fundamental behavior of a 802.11g network which already has embedded error correction in physical layer, under unicast and broadcast modes in a real outdoor environment. We then explore the effectiveness of packet level FEC over wireless networks with multi-rate capability. In order to evaluate the system quantitatively, we implemented a prototype using open source drivers, and ran experiments. Based on the experimental results, we provide guidelines on how to efficiently use FEC for wireless multicast services in order to improve the overall system performance. We argue that even there is a physical layer error correction, using a higher transmission rate together with stronger FEC is more efficient than using a lower transmission rate with weaker FEC for multicast.
Year
DOI
Venue
2010
10.1109/CCNC.2009.4784785
CCNC'09 Proceedings of the 6th IEEE Conference on Consumer Communications and Networking Conference
Keywords
Field
DocType
multi-rate wireless,multi-rate capability,existing wireless lan technology,physical layer error correction,wireless network,fec rate,dynamic wireless environment,stronger fec,wireless multicast service,video multicast,weaker fec,packet level fec,physical layer,wireless local area network,system performance,error correction,forward error correction,wireless communication,video quality
Wireless network,Forward error correction,Computer science,Network packet,Computer network,Real-time computing,Error detection and correction,Physical layer,Unicast,Multicast,Video quality
Conference
Citations 
PageRank 
References 
3
0.48
9
Authors
4
Name
Order
Citations
PageRank
Özgü Alay124730.68
Thanasis Korakis21401115.56
Yao Wang33757312.89
Shivendra S. Panwar42368177.48