计及倒换时延的需求响应业务P圈保护策略

A P-cycle Protection Strategy of Demand Response Service Considering the Protection Switching Latency

为应对日益增长的需求响应业务传输带宽需求,该文设计了一种考虑节点与链路业务承载能力的动态负载均衡模型,利用该模型能够有效实现网络局部业务疏导,将业务导向负载能力大的且保护水平高的链路上。同时,利用重要度将需求响应业务与非需求响应业务进行区分。在该基础上利用启发式算法自适应学习,有选择地针对需求响应业务提供不同的保护方式。以传统P圈配置和复用的方式为低重要度的业务配置保护路径,而高重要度的业务分别复用已配置P圈中单链路故障下的倒换时延最小保护路径。从而进一步提高资源利用率,降低阻塞率。仿真实验结果表明,所提的基于动态负载均衡的最小倒换时延P圈保护策略能在一定程度上提高资源利用率,降低冗余度的同时,实现重要等级高的业务倒换时延最小化目标局部最优求解。

In order to adapt to the increasing requirement of demand response services in bandwidth resource, a dynamic load balance model is proposed to reduce the burden on the power communication network. This model can analyze the distribution of services in each node and link of network, and realize the goal of traffic grooming. We also set the demand response connection request as the high-importance service than others. Based on the routing and dynamic load balancing, a method which can reuse previous established p-cycles was given. It can make differentiated protection with different importance level. And the more importance services become, the more likely services will be protected with the best p-cycles. Those importance services can have the best backup protection paths with the minimum protection switching latency, when the single-link failure is happening. The simulation results verified the effectiveness of the method. It can reduce the network blocking rate without affecting the resource redundancy.