Toward Optimal Resource Allocation of Virtualized Network Functions for Hierarchical Datacenters

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Show simple item record Wang, Chih-Chiang Lin, Ying-Dar Wu, Jang-Jiin Lin, Po-Ching Hwang, Ren-Hung 2019-09-11T09:07:25Z 2019-09-11T09:07:25Z 2018-08
dc.identifier.bibliographicCitation Wang, C. C., Lin, Y.D., Wu, J.J., Lin, P.C., Hwang, R.H. (2018). Toward Optimal Resource Allocation of Virtualized Network Functions for Hierarchical Datacenters. IEEE Transactions on Network and Service Management,15(4), pp. 1532 - 1544.
dc.identifier.issn 1932-4537
dc.description.abstract Telecommunications service providers (TSPs) previously provided network functions to end users with dedicated hardware, but they are resorting to virtualized infrastructure for reducing costs and increasing flexibility in resource allocation. A representative case is the Central Office Re-architected as Datacenter (CORD) project from AT&T, which aims to deploy virtualized network functions (VNFs) to over 4000 central offices (COs) across the U.S. However, there is a wide spectrum of options for deploying VNFs over the COs, varying from highly distributed to highly centralized manners. The former benefits end users with short response time but has its inherent limitation on utilizing geographically dispersed resources, while the latter allows resources to be better utilized at a cost of longer response time. In this work, we model the TSP's virtualized infrastructure as hierarchical datacenters, namely hierarchical CORD, and provide a resource allocation solution to strike the optimal balance between the two extreme options. Our evaluations reveal that in general, the 3-tier architecture incurs the least cost in case of deploying VNFs under moderate or loose delay constraints. Furthermore, the margin of improvement on the resource allocation cost increases inversely with the overall system utilization rate. Our results also suggest that as heavy request load overwhelms the network infrastructure, the relevant VNFs shall be migrated to lower-tier edge datacenters or to some nearby datacenters with superior network capacity. The evaluations also demonstrate that the proposed model allows highly adaptive VNF deployment in the hierarchical architecture under various conditions.
dc.description.sponsorship This work was supported in part by H2020 Collaborative Europe/Taiwan Research Project 5G-CORAL under Grant 761586, and in part by the Ministry of Science and Technology, Taiwan, under Grant MOST-106-2218-E-009-018 and Grant MOST-106-2221-E-194-021-MY3.
dc.format.extent 13
dc.language.iso eng
dc.publisher IEEE
dc.rights © 2018 IEEE.
dc.subject.other NFV
dc.subject.other Hierarchical CORD
dc.subject.other Resource allocation
dc.subject.other Optimization
dc.title Toward Optimal Resource Allocation of Virtualized Network Functions for Hierarchical Datacenters
dc.type article
dc.subject.eciencia Telecomunicaciones
dc.rights.accessRights openAccess
dc.relation.projectID info:eu-repo/grantAgreement/EC/H2020/761586
dc.type.version acceptedVersion
dc.identifier.publicationissue 4
dc.identifier.publicationtitle IEEE Transactions on Network and Service Management
dc.identifier.publicationvolume 15
dc.contributor.funder European Commission
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