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  • 1. Li, Bo
    et al.
    Yu, Xiaosong
    Zhao, Yongli
    Li, Yajie
    KTH.
    Ou, Qinghai
    Liu, Zhu
    Liao, Xiao
    Zhang, Jie
    Joint IT and Spectrum Resource Load Balancing for VNF Selection in Inter-Datacenter Elastic Optical Networks2017In: 2017 16TH INTERNATIONAL CONFERENCE ON OPTICAL COMMUNICATIONS & NETWORKS (ICOCN 2017), IEEE , 2017Conference paper (Refereed)
    Abstract [en]

    The selection of virtualized network functions (VNFs) in service provisioning is a critical issue in inter-datacenter elastic optical networks. In this paper, considering load balancing of IT and spectrum resources, we propose two joint balancing factors, i.e., Global Balancing factor (GB factor) and Local Balancing factor (LB-factor) for VNFs selection. Then a Joint-Optimization Selection (JOS) algorithm is designed based on the joint balancing factors. Simulation results show that GB-factor based JOS can achieve better performance compared with LB-factor based JOS and benchmark algorithm.

  • 2.
    Li, Yajie
    et al.
    KTH. Beijing University of Posts and Telecommunication, Beijing, China.
    Mårtensson, J.
    Fiorani, M.
    Skubic, B.
    Ghebretensaé, Z.
    Zhao, Y.
    Zhang, J.
    Wosinska, Lena
    KTH.
    Monti, Paolo
    KTH.
    Flexible RAN: A Radio Access Network Concept with Flexible Functional Splits and a Programmable Optical Transport2018In: 2017 European Conference on Optical Communication (ECOC), Institute of Electrical and Electronics Engineers (IEEE), 2018, p. 1-3Conference paper (Refereed)
    Abstract [en]

    We present the flexible RAN concept and evaluate its performance in different radio coordination scenarios considering an optical transport network. Results show the benefits of flexible RAN compared to C-RAN in terms of wavelength usage and transponder cost.

  • 3.
    Yajie, Li I.
    et al.
    KTH. Beijing University of Posts and Telecommunications, China.
    Zhao, Y.
    Zhang, J.
    Xiaosong, Y. U.
    Jing, R.
    Data analysis-based autonomic bandwidth adjustment in software defined multi-vendor optical transport networks2017In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 25, no 24, p. 29835-29846Article in journal (Refereed)
    Abstract [en]

    Network operators generally provide dedicated lightpaths for customers to meet the demand for high-quality transmission. Considering the variation of traffic load, customers usually rent peak bandwidth that exceeds the practical average traffic requirement. In this case, bandwidth provisioning is unmetered and customers have to pay according to peak bandwidth. Supposing that network operators could keep track of traffic load and allocate bandwidth dynamically, bandwidth can be provided as a metered service and customers would pay for the bandwidth that they actually use. To achieve cost-effective bandwidth provisioning, this paper proposes an autonomic bandwidth adjustment scheme based on data analysis of traffic load. The scheme is implemented in a software defined networking (SDN) controller and is demonstrated in the field trial of multi-vendor optical transport networks. The field trial shows that the proposed scheme can track traffic load and realize autonomic bandwidth adjustment. In addition, a simulation experiment is conducted to evaluate the performance of the proposed scheme. We also investigate the impact of different parameters on autonomic bandwidth adjustment. Simulation results show that the step size and adjustment period have significant influences on bandwidth savings and packet loss. A small value of step size and adjustment period can bring more benefits by tracking traffic variation with high accuracy. For network operators, the scheme can serve as technical support of realizing bandwidth as metered service in the future.

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