Virtualized Wireless SDNs： Modelling Delay Through the Use of Stochastic Network Calculus
摘要
Software-defined networks(SDN)have attracted much attention recently because of their flexibility in terms of network manage-ment.Increasingly,SDN is being introduced into wireless networks to form wireless SDN.One enabling technology for wirelessSDN is network virtualization,which logically divides one wireless network element,such as a base station,into multiple slices,and each slice serving as a standalone virtual BS.In this way,one physical mobile wireless network can be partitioned into multi-ple virtual networks in a software-defined manner.Wireless virtual networks comprising virtual base stations also need to provideQoS to mobile end-user services in the same context as their physical hosting networks.One key QoS parameter is delay.This pa-per presents a delay model for software-defined wireless virtual networks.Network calculus is used in the modelling.In particu-lar,stochastic network calculus,which describes more realistic models than deterministic network calculus,is used.The model en-ables theoretical investigation of wireless SDN,which is largely dominated by either algorithms or prototype implementations.