• Journal of the Institute of Electronics Engineers of Korea TC
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• v.43 no.3 s.345
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• pp.135-143
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• 2006

PQ(Priority Queue) and WRR(Weighted Round Robin) are the most famous schedulers, however, these schedulers have both points of advantages and disadvantages. In this paper, we propose an algorithm that can be adopted in my kind of scheduling type with making up for weak points of PQ and WRR. The proposed algorithm includes a fuzzy theory in the scheduler to assign priorities dynamically in the DiffServ network. This algorithm produces the control discipline by the fuzzy theory to assign priorities of the Queue effectively with checking the Queue status of each class dynamically under the discipline.

• Proceedings of the Korea Multimedia Society Conference
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• 2002.11b
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• pp.694-698
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• 2002

원격 교육의 서비스질의 문제는 지금까지 원격교육이 원격교육 기술의 확보와 컨텐츠확보 및 다양한 매체 영역확장의 과정이라 볼 수 있다. 인터넷 상에서 단순히 텍스트를 제시하고 이에 적절한 답을 피드백 하는 구조에서 적절한 그래픽 인터페이스구사 동영상 및 효과음 등의 멀티미디어 적 요소로의 진행 과정이 그것이다. 이제 이러한 초기 단계에서 사이버대학, 상업적 원격교육 등이 점차 중요한 현재 교육의 대안으로 되면서 원격교육의 서비스 질이 중요하게 되었다. 본 연구에서는 이러한 원격교육의 서비스 질 확보를 위한 현재 제안되고 구현되고 있는 기술들을 제시하고자 한다. 이로서는 IntServ 모델의 문제점을 극복하기 위해 제안된 DiffServ 모델은 현재 이의 구현을 위한 연구개발이 진행 중에 있다. 제안된 DiffServ 구조 및 지금까지 진행되어온 연구개발 현황 분석 등을 통해 제안된 DiffServ의 문제점과 대안 등을 검토하였다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.5B
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• pp.435-447
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• 2003

Current existing network dimensioning method simply relies on long-time measurement data or uses average traffic characteristics of users. In this paper, we propose an efficient network dimensioning method for DiffServ over MPLS networks. First, User's SLA information is distributed from edge nodes to core nodes according to the proposed algorithm. Then at each link, class-based capacity planning is performed. For capacity planning, we proposed sets of network design parameters for DiffServ classes and bandwidth allocation schemes that are most suitable for each class. We have developed a DiffServ over MPLS network design tool using the proposed method. Simulation results show that our proposed method is able to design efficiently the required class link resources.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.10B
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• pp.947-956
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• 2003

The current IP Routing Protocolspacket networks also need to provide the network QoS based of DiffServ, RSVP, MPLStraffic model which is standardized as IETF reference model for NGN. The first topic of this paper is to propose Traffic-Balanced Routing Protocol(TBRP) to process existing best effort traffic. TBRP will process low priority interactive data and background data which is not sensitive to dealy. Secondly Hierarchical Traffic-Traffic-Scheduling Routing Protocol(HTSRP) is also proposed. HTSRP is the hierarchical routing algorithm for backbone and access networkin case of fixed-wireless convergence network. Finally, HTSRP_Q is proposed to meet the QoS requirement when user want interactive or streaming packet service. This protocol will maximize the usage of resources of access layer based on the QoS parameters and process delay-sensitive traffic. Service classes are categorized into 5 types by the user request, such as conversational, streaming, high priority interactive, low priority interactive, and background class. It could be processed efficiently by the routing protocolstraffic model proposed in this paper. The proposed routing protocolstraffic model provides the increase of efficiency and stability of the next generation network thanks to the routing according to the characteristic of the specialized service categories.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.11b
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• pp.1499-1502
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• 2002

DiffServ 망에서 완전한 QoS를 망 사용자에게 제공하기 위해서는 downstream 트래픽 뿐만 아니라, upstream 트래픽에 marking, policing 을 적용해 주어야 한다. 본 논문에서는 downstream 트래픽에만 QoS를 적용하는 단방향 트래픽 제어기법과, downstream및 upstream 트래픽에 QoS를 적용하는 양방향 QoS 서비스 기법을 비교하기 위하여, cisco 라우터를 이용하여 QoS 테스트베드를 구성하고, 성능을 측정 및 분석하였다.

• Proceedings of the KIEE Conference
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• 2007.10a
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• pp.249-250
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• 2007

This paper presents design of meter for estimation Committed Information Rate(CIR) in Differentiated Services(DiffServ) networks. The DiffServ is a target model rather than a specification that contains detailed information about the required implementation. DiffServ provides a moderate level of quality differentiation without strict guarantees[1]. A DiffServ router consists of different components including classifier, meter, marker, dropper, shaper and scheduler. In this paper, we use the benefits of the fuzzy logic controller to design a fuzzy based traffic conditioner for DiffServ[2]. Simulations show that the approach is efficient and promising.

• The Journal of Information Systems
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• v.14 no.3
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• pp.97-104
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• 2005

The paper proposes an implementation architecture of DiffServ-over-MPLS traffic engineering (TE) on Intel IXP2400 network processor using Intel IXA SDK 4.0 Framework. Program architecture and functions are described. Also fast and scalable range-match classification scheme is proposed for DiffServ-over-MPLS TE that has been integrated with functional blocks from Intel Microblocks library. Performance test shows that application can process packets at approximate data rate of 3.5 Gbps. The proposed implementation architecture of DiffServ-over-MPLS TE on Network processor can provide guaranteed QoS on high-speed next generation Internet, while being flexible and easily modifiable.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.3B
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• pp.325-338
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• 2004

As the recent rapid development of internet technology and the wide spread of multimedia communication, massive increase of network traffic causes some problems such as the lack of network paths and the bad quality of service. To resolve these problems, this paper presents a traffic control agent that can perform the dynamic resource allocation by controlling traffic flows on a DiffServ network. In addition, this paper presents a router that can support DiffServ on Linux to support selective QoS in IP network environment. To implement a method for selective traffic transmission based on priority on a DiffServ router, this paper changes the queuing discipline in Linux, and presents the traffic control agent so that it can efficiently control routers, efficiently allocates network resources according to service requests, and relocate resources in response to state changes of the network. Particularly for the efficient processing of Assured Forwarding(AF) Per Hop Behavior(PHB), this paper proposes an ACWF$^2$Q$^{+}$ packet scheduler on a DiffServ router to enhance the throughput of packet transmission and the fairness of traffic services.s.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.5 no.5
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• pp.941-950
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• 2001

In this paper, we present the integrated network architecture for supporting mobile IP in third generation mobile communication networks, and propose the end-to-end QoS control mechanisms of DiffServ and QoS control functions of each network element in the proposed network. First, the QoS supporting schemes of IMT-2000 are described. Second, the necessities of integrating the networks are discussed and the integrated architecture are proposed. Third, the mapping between wireless channels and DiffServ classes are presented. Finally, the end-to-end QoS control mechanisms are proposed. We also analyze the link level protocols with QoS provisioning for mobile multimedia assuming that the system support voice and data traffic simultaneously. In case of data traffic, the delay and throughput of SREJ ARQ and Type-1 Hybrid ARQ scheme are compared, and In case of voice traffic, the packet loss rate of BCH coding is analyzed according to the varying data traffic loads. The results indicate that the adaptive link level protocols are efficient to meet the QoS requirements while the complexities are increased.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2004.07a
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• pp.135-135
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• 2004