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A Slotted Access Control Protocol For Metropolitan Wdm Ring Networks

机译：城域Wdm环网的时隙访问控制协议

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摘要

In this study we focus on the serious scalability problems that many access protocols for WDM ring networks introduce due to the use of a dedicated wavelength per access node for either transmission or reception. We propose an efficient slotted MAC protocol suitable for WDM ring metropolitan area networks. The proposed network architecture employs a separate wavelength for control information exchange prior to the data packet transmission. Each access node is equipped with a pair of tunable transceivers for data communication and a pair of fixed tuned transceivers for control information exchange. Also, each access node includes a set of fixed delay lines for synchronization reasons; to keep the data packets, while the control information is processed. An efficient access algorithm is applied to avoid both the data wavelengths and the receiver collisions. In our protocol, each access node is capable of transmitting and receiving over any of the data wavelengths, facing the scalability issues. Two different slot reuse schemes are assumed: the source and the destination stripping schemes. For both schemes, performance measures evaluation is provided via an analytic model. The analytical results are validated by a discrete event simulation model that uses Poisson traffic sources. Simulation results show that the proposed protocol manages efficient bandwidth utilization, especially under high load. Also, comparative simulation results prove that our protocol achieves significant performance improvement as compared with other WDMA protocols which restrict transmission over a dedicated data wavelength. Finally, performance measures evaluation is explored for diverse numbers of buffer size, access nodes and data wavelengths.
机译：在这项研究中，我们关注于WDM环形网络的许多接入协议引入的严重可扩展性问题，这是由于每个接入节点使用专用波长进行传输或接收而引起的。我们提出了一种适用于WDM环形城域网的高效时隙MAC协议。所提出的网络体系结构在数据分组传输之前采用单独的波长进行控制信息交换。每个接入节点都配备有一对用于数据通信的可调收发器和一对用于控制信息交换的固定调谐收发器。同样，由于同步的原因，每个接入节点包括一组固定的延迟线。在处理控制信息时保留数据包。应用有效的访问算法来避免数据波长和接收器冲突。在我们的协议中，每个接入节点都能够在任何数据波长上进行发送和接收，从而面临可伸缩性问题。假设有两种不同的时隙重用方案：源剥离方案和目标剥离方案。对于这两种方案，都通过分析模型来提供绩效指标评估。通过使用泊松流量源的离散事件模拟模型来验证分析结果。仿真结果表明，该协议可以有效地管理带宽利用率，尤其是在高负载下。同样，比较仿真结果证明，与其他WDMA协议相比，我们的协议实现了显着的性能提升，WDMA协议限制了专用数据波长上的传输。最后，针对各种数量的缓冲区大小，访问节点和数据波长，探索了性能指标评估。

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