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WDM光网中的一种邻域加权累积的波长分配策略
袁俊岭,张迪,张启坤,李旭红
0
(郑州轻工业学院 计算机与通信工程学院,郑州 450002;中原工学院 理学院,郑州 450007)
摘要:
针对光核心传送网中单纤场景下的路由选择与波长分配(Routing and Wavelength Assignment,RWA)问题,提出了一种邻域加权累积的波长分配策略。在一条路径上为一个连接请求选择波长时,将网络的所有链路归入当前路径的不同邻域中,然后根据与路径之间的距离为不同邻域赋予不同的权重,进而对每个波长在全网中被占用的个数进行加权累积,最后选择累积值最大的可用波长建立连接。仿真结果表明,相对于现有的阻塞率最低的最大使用(Most-Used)波长分配策略,所提策略具有更低的阻塞率。
关键词:  光网络  波长路由  路由与波长分配(RWA)  邻域加权累积(WNA)
DOI:
基金项目:国家自然科学基金资助项目(61501406,61772477);河南省高等学校重点科研项目计划(15A510015,15A520032)
A weighted-neighborhood-accumulation-based wavelength assignment strategy in WDM optical networks
YUAN Junling,ZHANG Di,ZHANG Qikun,LI Xuhong
(School of Computer and Communication Engineering,Zhengzhou University of Light Industry,Zhengzhou 450002,China;School of Science,Zhongyuan University of Technology,Zhengzhou 450007,China)
Abstract:
For the routing and wavelength assignment(RWA) problem in single core optical transport network scenario,this paper proposes a weighted-neighborhood-accumulation-based wavelength assignment strategy.When wavelength is assigned for a connection request on a path,all links in the network are classified into different neighborhoods of the current path and each neighborhood is given a different weight according to the distance to the path.Then,for each wavelength,the number of occupied links in the network is accumulated with weights,and the available wavelength with the maximum accumulated value is selected to establish the connection.Simulation results show that the proposed strategy has a lower blocking rate compared with the currently best-performed Most-Used wavelength assignment strategy.
Key words:  optical network  wavelength-routing  routing and wavelength assignment(RWA)  weighted neighborhood accumulation(WNA)
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