摘要
高速无源光网络中的业务请求是动态变化的,要求频谱分配策略能够快速适应变化。而且随着业务的不断接入和释放,频谱资源可能会变得碎片化,导致难以满足大带宽业务的需求,增加了频谱分配的难度。为此,本研究提出了一种基于时-频碎片感知的频谱分配方法。首先,获取高速无源光网络中业务请求的传输路径集;然后,根据路径的传输延时计算路径权重,将权重值作为路径可靠性的判断值,选取前k条可靠性最大的路径作为请求业务的备选传输路径;最后,在获取备选路径上的所有空闲频谱块的基础上,为更快速适应网络中的业务动态变化,通过时-频感知方法计算业务在各空闲频谱块位置的碎片度,并将碎片度最小的频谱块分配给请求的业务,通过减少频谱碎片化问题的方式,确保大带宽业务能够得到满足,提高频谱资源的整体利用率。实验结果表明,应用该方法后,高速无源光网络的链路碎片率最小值仅为0.6%,网络吞吐量的最大值可达到10.58 GB/s,以网络通信流量为1 100 erl时为例,应用该方法后的网络阻塞率仅为0.020%,说明该方法能够有效提高网络吞吐量、降低网络阻塞率与链路碎片率。
The business requests in high-speed passive optical networks are dynamically changing,requiring spectrum allocation strategies to quickly adapt to changes.And with the continuous access and release of services,spectrum resources may become fragmented,making it difficult to meet the needs of high bandwidth services and in-creasing the difficulty of spectrum allocation.Therefore,this study proposes a spectrum allocation method based on time-frequency fragment perception.Firstly,obtain the transmission path set of service requests in high-speed passive optical networks;Then,based on the transmission delay of the path,the path weight is calculated,and the weight val-ue is used as the judgment value for path reliability.The top k paths with the highest reliability are selected as alterna-tive transmission paths for the requested service;Finally,based on obtaining all the idle spectrum blocks on the alter-native path,in order to adapt more quickly to the dynamic changes of the network’s services,the time-frequency sensing method is used to calculate the fragmentation of the services at each idle spectrum block position,and the spectrum block with the smallest fragmentation is allocated to the requested service.By reducing the problem of spec-trum fragmentation,it ensures that large bandwidth services can be met and improves the overall utilization of spectrum resources.The experimental results show that after applying this method,the minimum link fragmentation rate of high-speed passive optical networks is only 0.6%,and the maximum network throughput can reach 10.58 GB/s.Taking the network communication traffic of 1100 erl as an example,the network blocking rate after applying this method is only 0.020%,indicating that this method can effectively improve network throughput,reduce network blocking rate and link fragmentation rate.
作者
韩琳
赵伟平
卜树红
HAN Lin;ZHAO Weiping;BU Shuhong(Baoding University of Technology,Baoding Hebei 071000,China)
出处
《激光杂志》
北大核心
2025年第8期163-168,共6页
Laser Journal
基金
河北省自然科学基金(No.2021500412)。
关键词
时-频碎片感知
高速无源光网络
频谱分配
路径选择
最大可靠性
time-frequency fragment perception
high speed passive optical network
spectrum allocation
path selection
maximum reliability
作者简介
韩琳(1980-),女,高级讲师,研究方向:计算机应用;通讯作者:赵伟平(1981-),女,讲师,研究方向:计算机应用。
