A Review of Routing and Wavelength Assignment Approaches for Wavelength- Routed Optical WDM Networks
A Review of Routing and Wavelength Assignment Approaches for Wavelength- Routed Optical WDM Networks
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发表时间：
2000
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通讯作者：
H. Zang;J. Jue;B. Mukherjee
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作者：
H. Zang;J. Jue;B. Mukherjee
本研究聚焦于波长路由光波分复用（WDM）网络中的路由和波长分配（RWA）问题。大部分注意力都集中在波长连续性约束下运行的此类网络上，在这种网络中，为节点对之间的连接请求建立光路，并且单条光路在其所跨越的所有链路上必须占用相同的波长。在建立光路时，必须选择一条路由并为该光路分配一个波长。如果在所选路由上没有波长可供该光路使用，则连接请求被阻塞。我们研究了RWA问题，并回顾了文献中提出的各种路由方法和波长分配方法。我们还简要考虑了波长转换网络（没有波长连续性约束）的特性，并研究了相关的研究问题和挑战。最后，我们提出了一种新的波长分配方案，称为分布式相对容量损失（DRCL），它在分布式控制网络中效果良好，并且我们通过仿真展示了DRCL的性能。
This study focuses on the routing and WavelengthAssignment (RWA) problem in wavelength-routed optical WDM networks. Most of the attention is devoted to such networks operating under the wavelength-continuity constraint, in which lightpaths are set up for connection requests between node pairs, and a single lightpath must occupy the same wavelength on all of the links that it spans. In setting up a lightpath, a route must be selected and a wavelength must be assigned to the lightpath. If no wavelength is available for this lightpath on the selected route, then the connection request is blocked. We examine the RWA problem and review various routing approaches and wavelengthassignment approaches proposed in the literature. We also briefly consider the characteristics of wavelength-converted networks (which do not have the wavelength-continuity constraint), and we examine the associated research problems and challenges. Finally, we propose a new wavelengthassignment scheme, called Distributed Relative Capacity Loss (DRCL), which works well in distributed-controlled networks, and we demonstrate the performance of DRCL through simulation.