[1] Chen Z, Feng G, Liu B et al. Delay optimization oriented service function chain migration and re-deployment in operator network[J]. Acta Electronica Sinica, 46, 2229-2237(2018).

[2] Eramo V, Ammar M, Lavacca F G. Migration energy aware reconfigurations of virtual network function instances in NFV architectures[J]. IEEE Access, 5, 4927-4938(2017). http://ieeexplore.ieee.org/document/7883907/

[3] Xuan H J, Wang Y P, Xu Z Q et al. Core selection algorithm for multi-core elastic optical networks[J]. Acta Optica Sinica, 36, 1206005(2016).

[4] Jiang X K, Zhao F, Fan Y Q et al. Frequency assignment algorithm for elastic optical network with multi-cores considering crosstalk[J]. Laser & Optoelectronics Progress, 54, 060601(2017).

[5] Chen X L, Zhu Z Q, Guo J N et al. Leveraging mixed-strategy gaming to realize incentive-driven VNF service chain provisioning in broker-based elastic optical inter-datacenter networks[J]. IEEE/OSA Journal of Optical Communications and Networking, 10, A232-A240(2018). http://ieeexplore.ieee.org/document/8293991

[6] Duan Q, Ansari N, Toy M. Software-defined network virtualization: an architectural framework for integrating SDN and NFV for service provisioning in future networks[J]. IEEE Network, 30, 10-16(2016). http://ieeexplore.ieee.org/document/7579021

[7] Mijumbi R, Serrat J, Gorricho J L et al. Network function virtualization: state-of-the-art and research challenges[J]. IEEE Communications Surveys & Tutorials, 18, 236-262(2016).

[8] Soares J, Gonçalves C, Parreira B et al. Toward a telco cloud environment for service functions[J]. IEEE Communications Magazine, 53, 98-106(2015). http://ieeexplore.ieee.org/xpls/icp.jsp?arnumber=7045397

[9] Mijumbi R, Serrat J, Gorricho J L et al. Design and evaluation of algorithms for mapping and scheduling of virtual network functions. [C]∥2015 1st IEEE Conference on Network Softwarization (NetSoft), April 13-17, 2015, London, UK. New York: IEEE, 15202730(2015).

[10] Zeng M L, Fang W J, Zhu Z Q. Orchestrating tree-type VNF forwarding graphs in inter-DC elastic optical networks[J]. Journal of Lightwave Technology, 34, 3330-3341(2016). http://ieeexplore.ieee.org/document/7466778/

[11] Eramo V, Miucci E, Ammar M et al. An approach for service function chain routing and virtual function network instance migration in network function virtualization architectures[J]. IEEE/ACM Transactions on Networking, 25, 2008-2025(2017). http://ieeexplore.ieee.org/document/7866881

[12] Wang L H, Lu Z M, Wen X M et al. Joint optimization of service function chaining and resource allocation in network function virtualization[J]. IEEE Access, 4, 8084-8094(2017).

[13] Li X, Qian C. The virtual network function placement problem. [C]∥2015 IEEE Conference on Computer Communications Workshops(INFOCOM WKSHPS), April 26-May 1, 2015, Hong Kong, China. New York: IEEE, 69-70(2015).

[14] Mechtri M, Ghribi C, Zeghlache D. A scalable algorithm for the placement of service function chains[J]. IEEE Transactions on Network and Service Management, 13, 533-546(2016). http://ieeexplore.ieee.org/document/7530847/

[15] Fang W J, Zeng M L, Liu X H et al. Joint spectrum and IT resource allocation for efficient VNF service chaining in inter-datacenter elastic optical networks[J]. IEEE Communications Letters, 20, 1539-1542(2016). http://ieeexplore.ieee.org/document/7490359/

[16] Zhao J J, Guo H. A routing and spectrum assignment algorithm with low delay in optical interconnection of data center[J]. Laser & Optoelectronics Progress, 55, 080602(2018).

[17] Ma W R, Medina C, Pan D. Traffic-aware placement of NFV middleboxes. [C]∥2015 IEEE Global Communications Conference (GLOBECOM), December 6-10, 2015, San Diego, CA, USA. New York: IEEE, 15820470(2015).

[18] Li B J, Lu W, Liu S Q et al. Deep-learning-assisted network orchestration for on-demand and cost-effective VNF service chaining in inter-DC elastic optical networks[J]. IEEE/OSA Journal of Optical Communications and Networking, 10, D29-D41(2018). http://www.opticsinfobase.org/jocn/abstract.cfm?uri=jocn-10-10-D29

[19] Savory S J. Congestion aware routing in nonlinear elastic optical networks[J]. IEEE Photonics Technology Letters, 26, 1057-1060(2014). http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6781032

[20] Gong L, Zhou X, Liu X H et al. Efficient resource allocation for all-optical multicasting over spectrum-sliced elastic optical networks[J]. Journal of Optical Communications and Networking, 5, 836-847(2013). http://ieeexplore.ieee.org/document/6578617/