基于路径可用性约束的HOWBAN备份路由策略

Backup routing strategy based on path availability constraints for HOWBAN

备份路由选取,不仅要考虑路径的不相关性,还应考虑业务恢复的资源需求以及备份资源利用率。针对此问题,在光无线混合宽带接入网的融合架构下,确立跨域传输路径可用性与用户对路径可用性需求之间的匹配关系,根据匹配结果分别在光域和无线域划分出2种约束情形,并由此构建用于备份路径选取的条件约束模型,依据此模型选择性预留备份带宽。以提高异构网络资源利用率为目标,将带宽资源划分为工作带宽、备份带宽及空闲带宽,在共享备份原则下,通过渐进优化的方式,按照备份带宽、空闲带宽的先后顺序,完成对工作路径的保护,从而以尽可能少的空闲带宽消耗来保障节点间的连接可用性。数值结果表明,提出的策略有效提高了网络故障恢复率和备份资源效率。

Backup route selection is not only the issue of selecting the irrelevant paths,but the needs of the resources for recovery and backup resource utilization should be also taken into account.For this problem,the matching relationship between the availability of the cross-domain transmission path and the demand for path availability is established under hybrid optical wireless broadband access networks,two constraints are divided into optical and wireless domains according to the matching result,based on the constructed conditional constraint model the backup bandwidth can be selectively reserved.In order to improve the utilization rate of heterogeneous network resources,the bandwidth is divided into working bandwidth,backup bandwidth and free bandwidth,under the principle of shared backup and incremental optimization,the working path is protected in the order of backup bandwidth and free bandwidth,thereby with minimal free bandwidth consumption can ensure connection availability.Numerical results show that the proposed strategy effectively improves the network fault recovery rate and backup resource efficiency.