摘要：

在列车控制与服务网络(TCSN)中,为确保控制业务的优先传输,并保证其他控制和服务业务的服务质量需求,必须对AF业务流量进行监管。传统流量监管方式是静态的,不能适应网络负载状态的不断变化。为此,提出一种动态令牌分配的TCSN多级令牌桶流量监管算法。在传统 令牌桶流量监管的基础上,采用两级令牌分配算法动态调节令牌添加速率以及重新分配令牌桶富余令牌,从而实现AF控制和服务业务流量的动态监管。仿真结果表明,该算法能够根据不同网络状态下AF子队列的欠缺令牌数、时延和丢包率情况来动态调整令牌分配配额。

关键词: 列车控制与服务网络, AF业务流量, 多级令牌分配, 令牌添加速率, 流量监管

Abstract:

In the Train Control and Service Network(TCSN),in order to ensure the priority of the transmission of control services and ensure the quality of service of other control and service business,the traffic flow of Assured Forward(AF) must be monitored.Traditional traffic monitoring methods are static,and can not adapt to changes in network load status.To solve this problem,a dynamic token allocation algorithm for TCSN multi-level token bucket traffic is proposed.On the basis of the traditional token bucket traffic supervision,the two level token allocation algorithm is used to dynamically adjust the token adding rate and redistribute the token bucket,so as to realize the dynamic regulation of the AF control and service traffic flow.Simulation results show that this algorithm can dynamically adjust the token allocation quota according to the number of missing tokens,delay and packet loss rate of AF subqueue under different network conditions.

Key words: Train Control and Service Network(TCSN), traffic flow of Assured Forward(AF), multi-level token allocation, token adding rate, traffic policing

中图分类号: 

• TP393