Paper Info
Title
DirCast: A practical and efficient Wi-Fi multicast system
Abstract
IP multicast applications such as live lecture broadcasts are being increasingly used in enterprise and campus networks. In many cases, end hosts access these multicast streams using Wi-Fi networks. However, multicast over Wi-Fi suffers from several well-known problems such as low data rate, high losses and unfairness vis-a-vis other contending unicast transmissions. In this paper we present DirCast, a system to solve many of these problems. DirCast requires no changes to the 802.11 MAC protocol or the wireless access points. Software changes are required on clients only if they wish to participate in multicast sessions. The aim of DirCast system is to minimize the airtime consumed by the multicast traffic, while simultaneously improving client experience. To meet these goals, the DirCast converts multicast packets to unicast packets targeted to certain selected clients; other clients receive these packets by listening in promiscuous mode. The target clients are carefully selected to minimize loss rate experienced by the non-targeted clients. If necessary, clients are forced to change the AP they are associated with. In addition, DirCast uses proactive adaptive FEC to further reduce the loss rate and implements a novel virtual multicast interface in order to be compatible with the security needs of the enterprise. We demonstrate the effectiveness of DirCast using extensive experiments in a Wi-Fi prototype implementation and through large-scale simulations.
Year
DOI
Venue
2009
10.1109/ICNP.2009.5339686
ICNP
Keywords
Field
DocType
efficient wi-fi multicast system,wi-fi prototype implementation,i. introduction,novel virtual multicast interface,ip multicast application,dircast system,multicast stream,multicast packet,loss rate,multicast traffic,wi-fi network,multicast session,ip multicast,security,data mining,unicast,wireless communication,servers
Source-specific multicast,Protocol Independent Multicast,Multicast address,Computer science,Xcast,Computer network,Pragmatic General Multicast,Multicast,Distance Vector Multicast Routing Protocol,IP multicast,Distributed computing
Conference
ISSN
Citations 
PageRank 
1092-1648
49
2.20
References 
Authors
23
7
Name
Order
Citations
PageRank
Ranveer Chandra14089268.00
sandeep karanth2492.20
Thomas Moscibroda34047200.40
Vishnu Navda486547.76
Jitendra Padhye56770514.84
R. Ramjee63180299.73
Lenin Ravindranath7124068.53