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Layered wireless video multicast using relays
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| Venue: | IEEE Trans. Circuits Syst. Video Technol |
| Citations: | 2 - 1 self |
BibTeX
@ARTICLE{Alay_layeredwireless,
author = {Özgü Alay and Student Member and Thanasis Korakis and Yao Wang and Elza Erkip and Senior Member and Shivendra S. Panwar and Senior Member},
title = {Layered wireless video multicast using relays},
journal = {IEEE Trans. Circuits Syst. Video Technol},
year = {}
}
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Abstract
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. In this paper, an integration of layered video coding, packet level forward error correction, and two-hop relaying is proposed to enable efficient and robust video multicast in infrastructure-based wireless networks. First, transmission with conventional omnidirectional antennas is considered where relays have to transmit in non-overlapping time slots in order to avoid collision. In order to improve system efficiency, we next investigate a system in which relays transmit simultaneously using directional antennas. In both systems, we consider a non-layered configuration, where the relays forward all received video packets and all users receive the same video quality, as well as a layered setup, where the relays forward only the base-layer video. For each system setup, we consider optimization of the relay placement, user partition, transmission rates of each hop, and time scheduling between source and relay transmissions. Our analysis shows that the non-layered system can provide better video quality to all users than the conventional direct transmission system, and the layered system enables some users to enjoy significantly better quality, while guaranteeing other users the same or better quality than direct transmission. The directional relay system can provide substantial improvements over the omni-directional relay system. To support our results, a prototype is implemented using open source drivers and socket programming, and the system performance is validated with real-world experiments. Index Terms—Directional relays, forward error correction, layered video coding, omni-directional relays, video multicast, wireless networks. I.
Keyphrases
layered wireless video multicast error correction video quality system setup non-layered system large number stable video quality conventional omnidirectional antenna substantial improvement open source driver video coding two-hop relaying many mobile user non-layered configuration socket programming base-layer video layered setup system performance video multicast wireless network infrastructure-based wireless network layered video coding bandwidth efficient manner omni-directional relay real-world experiment transmission rate index term directional relay popular event direct transmission robust video multicast relay placement layered system omni-directional relay system packet level system efficiency user partition relay transmission directional relay system directional antenna channel condition video packet abstract wireless video multicast conventional direct transmission system non-overlapping time slot
