• Journal of Communications and Networks
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• 제9권4호
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• pp.408-418
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• 2007

In this paper, we address the question of dynamic network provisioning for time-varying traffic rates, with the objective of maximizing the system throughput. We assume that the network is capable of providing bandwidth guaranteed traffic tunnels for an ingress-egress pair and present an approach that (1) updates the tunnel routes and (2) adjusts the tunnel bandwidths, in an incremental, adaptive manner, based on the variations in the incoming traffic. First, we consider a simpler scenario where tunnel routes are fixed, and present an approach for adjusting the tunnel bandwidths dynamically. We show, through simulations, that our dynamic bandwidth assignment algorithm significantly outperforms the optimal static bandwidth provisioning policy, and yields a performance close to that of the optimal dynamic bandwidth provisioning policy. We also propose an adaptive route update algorithm, which can be used in conjunction with our dynamic bandwidth assignment policy, and leads to further improvement in the overall system performance.

• 실천공학교육논문지
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• 제10권2호
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• pp.81-87
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• 2018

통신망을 이루는 주요 구간 중에 전송망에 해당하는 네트워크 구간에 대하여 소프트웨어 정의 네트워크 제어 기술은 네트워크 산업에 걸쳐 네트워크 운용 및 프로비저닝을 활용한 네트워크 제어 환경의 변화로 자리 잡아가고 있다. 현재 PTN 장비의 보급화와 함께 개발을 추진하고 있으며 프로비저닝을 위한 구성을 단계적으로 수행하고 있다. 실제 상용망의 PTN 장비를 주축으로 프로비저닝을 구성하면서 SDN기반 제어 시스템 구축을 적극적으로 도입하고 있다. 따라서 본 논문에서는 PTN을 주축으로 하는 패킷 기반 전송망에서의 SDN 시스템에 대한 내용과 동향을 살펴보고 SDN을 구성하기 위한 오픈소스인 OpenDaylight에 대한 연구를 통해 실제 상용망에서 활용하고자 하는 핵심 기술에 대해서 연구한다. 그리고 운영자들을 대상으로 운영 교육 모델에 필요한 소프트웨어 정의 제어 기술에 대해 연구한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권11호
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• pp.4720-4738
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• 2015

Proper management on user-driven virtual circuits (VCs) is essential for seamless operation of virtual networks. The Network Provisioning System (NPS) is useful software for creating user-driven VCs automatically and must take fault management into account for physical layer impairments on user-driven VCs. This paper addresses a user-driven and trusty protection management in an NPS with an open standard Network Service Interface (NSI), as a contribution to show how to implement the user-driven and trusty protection management required for user-driven VCs. In particular, it provides a RESTful web service Interface for Configuration and Event management (RICE) that enable management of a distinguished data and control plane VC status between Network Service Agents (NSAs) in the event of a node or link fault and repair in a domain. This capability represents a contribution to show how network and protection events in a domain can be monitored between NSAs (NPSs with the NSI) in multiple domains. The implemented NPS controls and manages both the primary and backup VC with disjoint path in a user-driven manner. A demonstration to verify RICE API's capability is addressed for the trusty protection in the dynamic VC network.

• ETRI Journal
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• 제37권2호
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• pp.369-379
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• 2015

Fault management of virtualized network environments using user-driven network provisioning systems (NPSs) is crucial for guaranteeing seamless virtual network services irrespective of physical infrastructure impairment. The network service interface (NSI) of the Open Grid Forum reflects the need for a common standard management API for the reservation and provisioning of user-driven virtual circuits (VCs) across global networks. NSI-based NPSs (that is, network service agents) can be used to compose user-driven VCs for mission-critical applications in a dynamic multi-domain. In this article, we first attempt to outline the design issues and challenges faced when attempting to provide mission-critical applications using dynamic VCs with a protection that is both user-driven and trustworthy in a dynamic multi-domain environment, to motivate work in this area of research. We also survey representative works that address inter-domain VC protection and qualitatively evaluate them and current NSI against the issues and challenges.

• 한국통신학회논문지
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• 제29권1B호
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• pp.125-132
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• 2004

본 논문에서는 정확한 트래픽 측정을 기반으로 하여 멀티미디어 Application에 대한 QoS를 제공할 수 있는 향상된 QoS 보장 Scheme (AQPS : Advanced QoS Provisioning Scheme)을 제안하고 이를 검증하였다. 먼저, 본 논문에서는 1xEV-DV 시스템을 기반으로 하여 해당 시스템의 QoS 요구사항을 추출하고 CDMA 트래픽 측정기술을 사용하여 이에 맞는 QoS 제공 방법을 도출하였으며, 제안한 AQPS가 기존의 1xEV-DV 네트워크 보다 네트워크 관리의 효율성이나 성능 측면에서 향상되었음을 컴퓨터 시뮬레이션을 통해 확인하였다.

• 한국정보통신학회논문지
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• 제26권9호
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• pp.1320-1329
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• 2022

현재 선도국가연구망 그룹에서 SDN/NFV 기반의 네트워크 자동화·지능화 기술을 사용자에게 서비스 형태로 제공하기 위한 요구가 지속적으로 발생함에 따라 관련 연구개발이 추진되고 있다. 또한, 선도국가연구망에서는 일반 네트워크 환경보다 대용량 데이터 전송을 고성능으로 제공해야 한다는 요구사항이 점차 더 커지고 있는 실정이다. 이에 따라, 본 논문에서는 이러한 국가연구망의 네트워킹 요구사항들에 대응하기 위하여 연구 개발한 대용량 데이터 전송을 위한 오픈 API 기반 가상 네트워크 프로비저닝 자동화 플랫폼을 제안하고 이의 구현 결과를 제시한다. 해당 플랫폼에는 SDN 기반의 네트워크 가상화 기술을 제공하는 KREONET-S의 VDN 시스템, 컨테이너 중심의 서버 가상화 기술을 제공하는 Kubernetes 시스템, 그리고 고성능 데이터 전송 시스템인 Globus Online이 포함되어 있다. 본 논문에서는 이러한 상이한 시스템 간의 연계를 위한 환경 설정 및 시스템 연동 결과, 가상 네트워크 프로비저닝 자동화 구현 결과 및 성능에 대하여 보인다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권12호
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• pp.5701-5722
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• 2018

The continuous increase in the cost of energy production and concerns for environmental sustainability are leading research communities, governments and industries to amass efforts to reduce energy consumption and global $CO_2$ footprint. Players in the information and communication industry are keen on reducing the operational expenditures (OpEx) and maintaining the profitability of cellular networks. Meanwhile, network virtualization has been proposed in this regard as the main enabler for 5G mobile cellular networks. In this paper, we propose a generic framework of slice resource provisioning and customized physical resource allocation for energy-efficiency and quality of service optimization. In resource slicing, we consider user demand and population resources provisioning scheme aiming to satisfy quality of service (QoS). In customized physical resource allocation, we formulate this problem with an integer non-linear programming model, which is solved by a heuristic algorithm based on minimum vertex coverage. The proposed algorithm is compared with the existing approaches, without consideration of slice resource constraints via system-level simulations. From the perspective of infrastructure providers, traffic is scheduled over a limited number of active small-cell base stations (sc-BSs) that significantly reduce the system energy consumption and improve the system's spectral efficiency. From the perspective of virtual network operators and mobile users, the proposed approach can guarantee QoS for mobile users and improve user satisfaction.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권8호
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• pp.2840-2853
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• 2015

A major challenge in network service providers is to provide adequate resources in service level agreements based on forecasts of future demands. In this paper, we address the problem of capacity provisioning in a network subject to demand uncertainty such that a network coded multicast is applied as the data delivery mechanism with limited budget to purchase extra capacity. We address some particular type of uncertainty sets that obtain a tractable constrained capacity provisioning problem. For this reason, we first formulate a mathematical model for the problem under uncertain demand. Then, a robust optimization model is proposed for the problem to optimize the worst-case system performance. The robustness and effectiveness of the developed model are demonstrated by numerical results. The robust solution achieves more than 10% reduction and is better than the deterministic solution in the worst case.

• International Journal of Computer Science & Network Security
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• 제22권3호
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• pp.95-100
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• 2022

Cloud computing platform is a shared pool of resources and services with various kind of models delivered to the customers through the Internet. The methods include an on-demand dynamically-scalable form charged using a pay-per-use model. The main problem with this model is the allocation of resource in dynamic. In this paper, we have proposed a mechanism to optimize the resource provisioning task by reducing the job completion time while, minimizing the associated cost. We present the Cooperative Agents Dynamic Resource Allocation and Monitoring in Cloud Computing CADRAM system, which includes more than one agent in order to manage and observe resource provided by the service provider while considering the Clients' quality of service (QoS) requirements as defined in the service-level agreement (SLA). Moreover, CADRAM contains a new Virtual Machine (VM) selection algorithm called the Node Failure Discovery (NFD) algorithm. The performance of the CADRAM system is evaluated using the CloudSim tool. The results illustrated that CADRAM system increases resource utilization and decreases power consumption while avoiding SLA violations.

• 컴퓨터교육학회논문지
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• 제12권2호
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• pp.77-86
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• 2009

대용량 연구자원과 실시간 데이터 전달을 필요로 하는 대용량 어플리케이션은 현재의 인터넷 환경보다 더 안정적이고 성능이 우수한 네트워킹 환경을 요구하고 있다. 최근의 글로벌 연구망에서는 이러한 어플리케이션의 요구를 충족하기 위해 람다 네트워킹 기술과 자원할당 시스템의 활용에 초점을 맞추고 있다. 본 논문에서는 성능과 안정성이 우수한 람다네트워킹의 장점을 반영하기 위해 기존 DRS(Dynamic Right-Sizing) 모델을 수정하였다. 아울러, 융합형 NRPS(Network Resource Provisioning System) 모델에 본 논문의 수정된 DRS 모델을 적용한 고성능 람다 네트워크의 설계방안을 제시한다.