A STAGGERED-CHANNEL-CLUSTER APPROACH TO SUPPORT VIDEO MULTICAST HANDOFF IN WIRELESS NETWORKS

in International Symposium (oral presentation paper), 國際研討會(全文口頭發表)
標題A STAGGERED-CHANNEL-CLUSTER APPROACH TO SUPPORT VIDEO MULTICAST HANDOFF IN WIRELESS NETWORKS
出版類型國際研討會(全文口頭發表)
出版年度2008
AuthorsSheau-Ru Tong, 童曉儒, & Chun-Wei Hung C. - W. H.
出版日期Jun 30 2008 12:0
會議地點Hanover
其他編號0000
中文摘要

Video multicast handoff in wireless networks is challenged
by various impairments, such as high bit-error-rate, connection disruption
and asynchronous stream concatenation. We tackle this problem by
proposing a two-stage multicast approach, where a video stream is
distributed to a group of access routers using a regular IP multicast. Within
a local subnet, each access router further replicates and forwards the stream
over a cluster of multicast channels by enforcing a staggered transmission
schedule. A mobile host subscribes to all these channels and employs a
buffer control to recover errors and to build up necessary backlogs. This
approach gives us a scalable way to improve the error recovery rate and to
smooth out potential stream gaps caused by the handoff. Some theoretical
results concerning the buffer requirements for guaranteeing the seamless
handoff are derived. The simulation results reveal that a cluster of three
multicast channels along with a couple-second-video-clip buffer deployed
in each access router and mobile host are capable of achieving satisfactory
seamless video multicast handoff in most of the typical network
environments.
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