Effective Algorithms for Multicast Video Transport to Meet Various QoS Requirements

Kentarou FUKUDA  Naoki WAKAMIYA  Masayuki MURATA  Hideo MIYAHARA  

IEICE TRANSACTIONS on Communications   Vol.E81-B   No.8   pp.1599-1607
Publication Date: 1998/08/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Multimedia Communications in Heterogeneous Network Environments)
Category: Multicasting
real-time video transport,  multicast,  QoS guarantees,  flow aggregation,  

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In this paper, we propose flow aggregation algorithms for multicast video transport. Because of heterogeneities of network/client environments and users' preference on the perceived video quality, various QoS requirements must be simultaneously guaranteed even for the single video source in the multicast connection. It is easy but ineffective to provide many video streams according to each user's request. Our flow aggregation algorithm arranges similar QoS requirements of clients into a single QoS requirement, by which the required number of video streams that the video server prepares can be decreased. Then the total amount of the required bandwidth can be reduced by sharing the same video stream among a number of clients. Our flow aggregation algorithm has two variants, which are suitable to sender-initiated and receiver-initiated multicast connections, respectively. Proposed algorithms are evaluated and compared through simulation. Then we show that the server-initiated flow aggregation (an ideal case in our approach) is most effective, but the receiver-initiated flow aggregation can also offer a reasonably effective mechanism.