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Adaptive group multicast with time-driven priority
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DOI：10.1109/90.836476.png)
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This paper shows how to provide an adaptive real-time group multicast (many-to-many) communication service, Adaptive means that the number of nodes that transmit to the multicast group is continuously changing, In order to meet deterministic quality-of-service (QoS) requirements of a real-time group multicast, some communication resources are reserved. In this work we show 1) how bandwidth is reserved for each multicast group and 2) how an active source can dynamically share the bandwidth allocated to this multicast group with other active group members, Quality-of-service support for a real-time multicast group is based on time-driven priority [9]. In this scheme the time is divided into time frames of fixed duration, and all the time frames are aligned by using a common global time reference, which can be obtained from the global positioning system. Bandwidth is allocated to a multicast group as a whole, rather than individually to each user. The allocation is done by reserving time intervals within time frames in a periodic fashion, This type of allocation raises two problems that are studied in this paper: 1) scheduling: how time intervals are reserved to each multicast group and 2) adaptive sharing: how the active (transmitting) participants can dynamically share the time intervals that have been reserved for their multicast group. The proposed approach is based on the embedding of multiple virtual rings, one for each multicast group. By using the virtual rings, it is simple to route messages to all the participants while minimizing the bound on the buffer sizes and queueing delays. The finalpart of this paper introduces a scalable growth of the multicast group by adding multiple subtrees to the virtual ring.
Keyword:
fairness
multicast
quality of service
real time
ring networks
scheduling
time-driven prioritiy
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4.4K
被引数:
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