In single-hop WDM networks, a data packet can be transmitted from one node to another only when one of the transmitters of the source node and one of the receivers of the destination node are tuned to the same wavelength, i.e., a data packet is transmitted from one node to another without going through intermediate nodes. A hybrid multicast scheduling algorithm for single-hop WDM networks

SUMMARYThis paper proposes a multicast packet preferential transmission system combining preallocation and waveform monitoring schemes with the RingO network. In the proposed system, a multicast packet preferential time slot is allocated to each node by preallocation. Each node can use all wavelengths in the allocated time slot to transmit a multicast packet simultaneously to all destination nodes. Wavelength monitoring is applied to time slots other than the allocated time slot, and if there is an available wavelength channel, a unicast packet is transmitted. Thus, the data packets are transmitted with high efficiency. The performance is evaluated by computer simulation. It is shown that the proposed system can greatly improve the mean packet delay and the throughput characteristics, compared to the simultaneous transmission system, in a heavily loaded situation with an input load exceeding 0.9. The proposed method is also shown to be more effective than the partitioned transmission system, in that the transmission delay difference of multicast packets between destination nodes, and also the packet delay difference of multicast packets for each destination node, can be reduced. © 2007 Wiley Periodicals, Inc. Electron Comm Jpn Pt 2, 90(7): 56-68, 2007; Published online in Wiley InterScience (www.interscience.wiley.com).

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Preferential transmission of multicast packets using a preallocation scheme in combination with a wavelength monitoring scheme on a RingO network

Okazaki

Shimada

Sasase

2007

Electron Comm Jpn Pt II

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Designs of high-performance multicast scheduling mechanisms in WDM networks

Hung

2009

Photon Netw Commun

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In this article, we propose three multicast scheduling mechanisms, lookback queue access, lookback ratio access, and double check head access, for the employment in the single-star Wavelength Division Multiplexing optical network. Each of the proposed scheduling schemes consists of two phases and is executed in real time. In general, the first phase is to search for a candidate multicast packet that can be sent, without partition, to all of its intended recipients. If phase 1 fails, the second phase is then activated to partition a multicast packet into multiple transmissions in accordance with specific criteria of each individual mechanism. These algorithms are designed to mitigate the head-of-line blocking effect, while at the same time achieving excellent network throughput levels and delay performance via the partitioning procedure. Performance results reveal the distinct features of each mechanism under various scenarios. For a wider range of networking environments, we further propose an interconnected dual-star structure and enhanced multicast scheduling algorithms. These enhanced schemes aim to exploit the inter-data channels efficiently and utilize the wavelength reuse property of the intra-data channels properly. Performance results have demonstrated the merits of deploying the proposed multicast algorithms in such a dual-star structure.

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A novel multicast mechanism for optical local area networks

Huang

2007

Computers & Electrical Engineering

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Cited by 16 publications

References 31 publications

Preferential transmission of multicast packets using a preallocation scheme in combination with a wavelength monitoring scheme on a RingO network

Preferential transmission of multicast packets using a preallocation scheme in combination with a wavelength monitoring scheme on a RingO network

Designs of high-performance multicast scheduling mechanisms in WDM networks

A novel multicast mechanism for optical local area networks

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