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聚焦长距离无源光网络生存性机制研究,针对单共享风险链路组故障提出一种基于连接可用性的成本有效规划方法.首先,设计了一种基于故障概率的连接可用性模型,计算每个光网络单元的连接可用性.对于不满足连接可用性要求的每个工作光网络单元,为其分配备用光网络单元,其中每个备用光网络单元需要为工作光网络单元预留备用容量.然后,在不同光网络单元之间部署备用光纤,确保每对工作和备用光网络单元之间至少存在一条备用光路径.当一个工作光网络单元因为光纤链路故障而遭遇连接中断时,可将其业务通过备用光路径转移到备用光网络单元承载.通过仿真对所提方法在备用光纤部署成本方面的性能进行了分析.结果表明,该方法能实现比传统邻居保护方法更低的备用光纤部署成本,可解决备用容量分配和备用光纤部署的联合优化问题,在满足连接可用性要求的前提下,通过最小的备用光纤部署成本实现所有业务完全保护.
Focusing on the survivability mechanism of long-haul passive optical networks, a cost-effective planning method based on connection availability is proposed for single shared risk link group failures.Firstly, a connection availability model based on failure probability is designed to calculate each light For each working optical network unit that does not meet the connection availability requirements, it is allocated a standby optical network unit, where each backup optical network unit needs to reserve spare capacity for the working optical network unit, and then, in different Spare optical fibers are deployed between optical network units to ensure that there is at least one spare optical path between each pair of active and standby optical network units When a working optical network unit encounters a loss of connectivity due to a fiber link failure, The optical path is transferred to the standby optical network unit, and the performance of the proposed method in spare optical deployment cost is analyzed through simulation.The results show that the proposed method can achieve lower standby optical deployment cost than the traditional neighbor protection method, which can be solved Joint optimization of spare capacity allocation and standby fiber deployment issues can be fulfilled Under the premise required to achieve complete protection all business with minimal standby fiber deployment costs.