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dc.contributor.authorWang, Chih-Chiangen_US
dc.contributor.authorLin, Ying-Daren_US
dc.contributor.authorWu, Jang-Jiinen_US
dc.contributor.authorLin, Po-Chingen_US
dc.contributor.authorHwang, Ren-Hungen_US
dc.date.accessioned2019-04-02T05:58:27Z-
dc.date.available2019-04-02T05:58:27Z-
dc.date.issued2018-12-01en_US
dc.identifier.issn1932-4537en_US
dc.identifier.urihttp://dx.doi.org/10.1109/TNSM.2018.2862422en_US
dc.identifier.urihttp://hdl.handle.net/11536/148630-
dc.description.abstractTelecommunications 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.en_US
dc.language.isoen_USen_US
dc.subjectNFVen_US
dc.subjecthierarchical CORDen_US
dc.subjectresource allocationen_US
dc.subjectoptimizationen_US
dc.titleToward Optimal Resource Allocation of Virtualized Network Functions for Hierarchical Datacentersen_US
dc.typeArticleen_US
dc.identifier.doi10.1109/TNSM.2018.2862422en_US
dc.identifier.journalIEEE TRANSACTIONS ON NETWORK AND SERVICE MANAGEMENTen_US
dc.citation.volume15en_US
dc.citation.spage1532en_US
dc.citation.epage1544en_US
dc.contributor.department資訊工程學系zh_TW
dc.contributor.departmentDepartment of Computer Scienceen_US
dc.identifier.wosnumberWOS:000454221200026en_US
dc.citation.woscount0en_US
Appears in Collections:Articles