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ZTE Communications ›› 2014, Vol. 12 ›› Issue (2): 50-56.DOI: DOI:10.3969/j.issn.1673-5188.2014.02.008

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VirtualizedWireless SDNs: Modelling Delay Through the Use of Stochastic Network Calculus

Lianming Zhang 1, Jia Liu 1, and Kun Yang 2   

  1. 1. College of Physics and Information Science, Hunan Normal University, Changsha 410081, China;
    2. Network Convergence Laboratory, University of Essex, Colchester CO4 3SQ, United Kingdom
  • Received:2014-02-24 Online:2014-06-25 Published:2014-06-25
  • About author:Lianming Zhang (zlm@hunnu.edu.cn) received his PhD from Central South University, China. He received his BS degree and MS degree from Hunan Normal University, China. He is currently a professor in the school of Physics and Information Science, Hunan Normal University. His current research interests include software-defined networking, complex networks, and network calculus. He completed a twoyear postdoctoral fellowship in complex networking at South China University of Technology. He has published more than 90 papers.

    Jia Liu is currently an MS student in the College of Physics and Information Science, Hunan Normal University. She also received her BEng. degree from Hunan Normal University. Her research interests include wireless communications, wireless networks, and network calculus. She has published one journal paper in Springer/ACM Mobile Networks and Applications (MONET) and one conference paper in IEEE MOBIQUITOUS 2013.

    Kun Yang (kunyang@essex.ac.uk) received his PhD from University College London. He received his BSc degree and MSc degree from Jilin University, China. He is currently a chair professor in the School of Computer Science and Electronic Engineering, University of Essex, and leads the Network Convergence Laboratory (NCL) there. Before joining the University of Essex in 2003, he worked for several years at UCL on several EU research projects. His main research interests include heterogeneous wireless networks, fixed mobile convergence, future Internet technology and network virtualization, cloud computing and networking. He manages research projects funded by various sources such as UK EPSRC, EU FP7 and industries. He has published 60+ journal papers. He serves on the editorial boards of both IEEE and non-IEEE journals. He is a Senior Member of IEEE and a Fellow of IET.

VirtualizedWireless SDNs: Modelling Delay Through the Use of Stochastic Network Calculus

Lianming Zhang 1, Jia Liu 1, and Kun Yang 2   

  1. 1. College of Physics and Information Science, Hunan Normal University, Changsha 410081, China;
    2. Network Convergence Laboratory, University of Essex, Colchester CO4 3SQ, United Kingdom
  • 作者简介:Lianming Zhang (zlm@hunnu.edu.cn) received his PhD from Central South University, China. He received his BS degree and MS degree from Hunan Normal University, China. He is currently a professor in the school of Physics and Information Science, Hunan Normal University. His current research interests include software-defined networking, complex networks, and network calculus. He completed a twoyear postdoctoral fellowship in complex networking at South China University of Technology. He has published more than 90 papers.

    Jia Liu is currently an MS student in the College of Physics and Information Science, Hunan Normal University. She also received her BEng. degree from Hunan Normal University. Her research interests include wireless communications, wireless networks, and network calculus. She has published one journal paper in Springer/ACM Mobile Networks and Applications (MONET) and one conference paper in IEEE MOBIQUITOUS 2013.

    Kun Yang (kunyang@essex.ac.uk) received his PhD from University College London. He received his BSc degree and MSc degree from Jilin University, China. He is currently a chair professor in the School of Computer Science and Electronic Engineering, University of Essex, and leads the Network Convergence Laboratory (NCL) there. Before joining the University of Essex in 2003, he worked for several years at UCL on several EU research projects. His main research interests include heterogeneous wireless networks, fixed mobile convergence, future Internet technology and network virtualization, cloud computing and networking. He manages research projects funded by various sources such as UK EPSRC, EU FP7 and industries. He has published 60+ journal papers. He serves on the editorial boards of both IEEE and non-IEEE journals. He is a Senior Member of IEEE and a Fellow of IET.

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Abstract: Software-defined networks (SDN) have attracted much attention recently because of their flexibility in terms of network management. Increasingly, SDN is being introduced into wireless networks to form wireless SDN. One enabling technology for wireless SDN 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 multiple virtual networks in a software-defined manner. Wireless virtual networks comprising virtual base stations also need to provide QoS to mobile end-user services in the same context as their physical hosting networks. One key QoS parameter is delay. This paper presents a delay model for software-defined wireless virtual networks. Network calculus is used in the modelling. In particular, stochastic network calculus, which describes more realistic models than deterministic network calculus, is used. The model enables theoretical investigation of wireless SDN, which is largely dominated by either algorithms or prototype implementations.

Key words: wireless software defined networks (SDN), wireless network virtualization, QoS modelling, upper bound delay, stochastic network calculus

摘要： Software-defined networks (SDN) have attracted much attention recently because of their flexibility in terms of network management. Increasingly, SDN is being introduced into wireless networks to form wireless SDN. One enabling technology for wireless SDN 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 multiple virtual networks in a software-defined manner. Wireless virtual networks comprising virtual base stations also need to provide QoS to mobile end-user services in the same context as their physical hosting networks. One key QoS parameter is delay. This paper presents a delay model for software-defined wireless virtual networks. Network calculus is used in the modelling. In particular, stochastic network calculus, which describes more realistic models than deterministic network calculus, is used. The model enables theoretical investigation of wireless SDN, which is largely dominated by either algorithms or prototype implementations.

关键词: wireless software defined networks (SDN), wireless network virtualization, QoS modelling, upper bound delay, stochastic network calculus