Multicast Live Video Broadcasting Using Real Time Transmission

In this paper, we address the problem of real-time video streaming over wireless LANs for both unicast and multicast transmission. The wireless channel is modeled as a packet-erasure channel at the IP level. For the unicast scenario, we describe a novel hybrid Automatic Repeat reQuest (ARQ) algorithm that efficiently combines forward error control (FEC) coding with the ARQ protocol. For the multiple-users scenario, we formulate the problem of real-time video multicast as an optimization of a maximum regret cost function across the multicast user space.

AUDIO and video streaming over wired networks, such as the Internet, have been popular now for quite some time. However, with the development of broadband wireless networks, attention has only recently turned to delivering video over wireless networks. In this paper, we focus on the wireless Local Area Network (LAN), which can operate at high enough bit rates to allow transmission of high quality video data. Specifically, we investigate the IEEE 802.11b wireless LAN, though the ideas that we present are applicable to other wireless networks as well.