Hybrid Scheduling for Unicast and Multicast Traffic in Broadcast WDM Networks(Special Issue on Advanced Internetworking based on Photonic Network Technologies)

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概要

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• Session length and group size are two most significant factors in achieving efficient scheduling for unicast and multicast traffic in single-hop wavelength division multiplexing(WDM)local area networks(LANs). This paper presents a hybrid protocol to schedule both unicast and multicast traffic in broadcast WDM networks. The protocol makes an important assumption that unicast traffic is the major portion of the over-all traffic and is usually scheduled with a pre-allocation-based protocol. On the other hand, multicast traffic is a smaller portion of the overall traffic with multicast sessions and multicast groups, and is scheduled with a reservation-based protocol. The concept of multicast threshold, a function of random variables including the multicast session length and the multicast group size, is also proposed to partition the multicast traffic into two types. If the transmission threshold of a multicast request is larger than the multicast threshold, the request is handled with a reservation-based protocol. Otherwise, the multicast request is handled similar to unicast traffic ; that is, each packet in the multicast session is replicated and sent to the unicast queues of destinations. The results show that the hybrid protocol can achieve better channel utilization efficiency and packet delay for unicast traffic under the multicast scenarios with moderate session length and group size. However, separate scheduling or broadcasting will be more suitable for a multicast scenario with very large session length and group size, which is not common on most realistic networks.

• 社団法人電子情報通信学会の論文
• 2000-10-25

著者

• Tseng Wen-yu

  The Author Is With The Department Of Electrical Engineering National Taiwan University

• Kuo Sy-yen

  The Author Is With The Department Of Electrical Engineering National Taiwan University:presently Wit

• Kuo Sy-yen

  The Author Is With The Department Of Electrical Engineering National Taiwan University

関連論文

• Real-Time Multicast Routing with Efficient Path Selection for Multimedia Applications
• Hybrid Scheduling for Unicast and Multicast Traffic in Broadcast WDM Networks(Special Issue on Advanced Internetworking based on Photonic Network Technologies)
• Efficient Recovery from Communication Errors in Distributed Shared Memory Systems
• Fault Tolerant Crossconnect and Wavelength Routing in All-Optical Networks(Special Issue on Advanced Internetworking based on Photonic Network Technologies)

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