Dynamic Traffic Grooming Policy for Frame Preemption Sensing

• 1、School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876

Abstract：In the Ethernet-over-WDM network, IP services are encapsulated into Ethernet frames for transmission. The storage and forwarding of data frames in the queue will produce queuing delay, which will affect the latency-sensitive services.Frame preemption technology allows high-priority frames to preempt the sending port of low-priority frames, reducing its queuing delay.Traffic grooming aggregates multiple service flows to one wavelength for transmission, and this paper applies frame preemption technology to the traffic grooming process.It can reduce the queuing delay of latency-sensitive services when multiple services compete for the same port.However, due to cost constraints, it is impossible for all nodes in the network to deploy the frame preemption function, and nodes that do not have the preemption function cannot reassemble the preempted frames, which affects the normal transmission of data frames.Aiming at the problem of limited frame preemption function of nodes, this paper proposes a traffic grooming auxiliary graph model based on frame preemption sensing, and designs a dynamic traffic grooming strategy according to the auxiliary graph model. The simulation results show that different grooming policies have various performance under different network configurations. The auxiliary graph model helps to choose the best path under the frame preemption constraints.

Keywords： Ethernet-over-WDM dynamic traffic grooming fronthaul frame preemption technology auxiliary graph model?????