TSN时间敏感流量带宽分配与优化

Bandwidth allocation and optimization of time-sensitive traffic in TSN

针对时间敏感网络(time-sensitive networking,TSN)中时间敏感流量的带宽分配,必须要根据流量传输的实时性需求,并考虑不同类型流量的占比,提供具体的优化策略和带宽分配结果。首先,基于网络演算方法,建立时敏流量带宽分配评估模型;然后,根据实时性需求构建带宽分配的约束条件,采用启发式方法,实施带宽分配的优化;最后,通过案例,验证带宽分配在不同链路负载率和流量占比下的变化趋势。实验结果表明,采用基于信用量的流量整形机制,当案例中A类型流量的带宽分配占比为70%时,可获得最佳带宽匹配效果,实现网络中所有流量端到端延迟和最小的流量传输。

For the bandwidth allocation of time-sensitive traffic in time-sensitive networking(TSN),it is important to provide specific optimization strategies and bandwidth allocation results based on the real-time requirements of traffic delivery with the consideration of the share of different types of traffic Based on this,a specific optimization strategy can be provided for bandwidth assignments according to the real-time requirements of traffic transmission.In this paper,we first establish a bandwidth allocation evaluation model based on network calculus.Then,a heuristic algorithm is used to optimize the bandwidth allocation when the constraints are constructed based on real-time requirements.Finally,cases are used to study the changing trend of optimized results under various influences,including the traffic loads and proportion of different traffic classes.The evaluation results show that based on the credit-based shaping(CBS)mechanism for traffic,the lowest overall end-to-end delay for traffic transmission can be obtained when the proportion of class A traffic is 70%in the example network,thereby realize the best matching ratio.