• Journal of the Korea Society of Computer and Information
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• v.16 no.2
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• pp.93-99
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• 2011

In this paper, we propose a policy-gradient routing scheme under Reinforcement Learning that can be used adaptive QoS routing. A policy-gradient RL routing can provide fast learning of network environments as using optimal policy adapted average estimate rewards gradient values. This technique shows that fast of learning network environments results in high success rate of routing. For prove it, we simulate and compare with three different schemes.

• Proceedings of the Korea Contents Association Conference
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• 2009.05a
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• pp.884-888
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• 2009

Vehicular Adhoc Networks (VANET), a Vehicle-to-Infrastucture or Vehicle-to-Vehicle communication technology, is an area that makes more specific use of Mobile Adhoc Networks(MANET). VANET's Quality of Service(QoS) focuses on preventing possible emergencies like car crash from happening by immediately transmitting information to the cars around, while MANET's QoS is being studied for the quality of multimedia data such as Video on Demand(VoD), Video streaming, Voice over IP(VoIP), etc. In this paper, I structure the actual network configuration using Link State Routing(LSR), implement QoS Provisioning Model using Common Open Policy Service(COPS), and suggest more effective k-hop Cluster and inter-domain policy negotiation which fit better to the characteristics of VANET.

• Journal of the Korea Society of Computer and Information
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• v.12 no.4
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• pp.119-125
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• 2007

On account of limited resources and diverse topology change. it is difficult to manage MANET and guarantee QoS. In current MANET, QoS grantee is exceedingly significant. However, today's MANET are being concentrately worked on MAC protocols and routing protocols. Thus we proposed a framework for effective management of MANET and supporting QoS using policy based network management paradigm and active network technology. Since this framework employs the policy-based management approach in active network environment, it provides an abstract and autonomous management method to network managers.

• Proceedings of the Korea Information Processing Society Conference
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• 2000.04a
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• pp.1084-1088
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• 2000

현재 인터넷에서 QoS(Quality of Service )를 보장하기 위해 다양한 메커니즘이 제안되고 있다. 통신망에서 QoS를 지원하기 위해서는 해당 응용 서비스마다 적절한 자원을 할당하고 자원 사용을 모니터링 및 제어하며, 이례적인 사건이 발생하였을 경우 자원을 재할당할 수 있도록 지원하는 자원관리 기능이 요구된다. 본 논문에서는 차등서비스를 제공하는 인터넷에서 QoS를 제공하기 위해 망자원을 관리 및 제어하는 정책기반 자원관리시스템의 설계 및 구현에 대해 기술한다. 정책기반 자원관리 시스템은 도메인 내의 사용자나 망 관리자로부터 QoS 요구를 받으면 도메인 내의 자원사용량과 자원사용정책에 따라서 내부자원을 할당하고, 이웃도메인과는 QoS가 보장되도록 SLA(Service Level Agreement)를 체결하는 기능을 수행한다. 구현한 정책기반 자원관리시스템은 정책정보를 PIB(Policy Information Base)의 형태로 정책 데이터베이스에 저장하며, 정책서버와 정책 클라이언트 사이에는COPS(Common Open Policy Service)프로토콜을 사용하여 정책 정보를 송수신함을 특징으로 한다.

• Proceedings of the IEEK Conference
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• 2003.07a
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• pp.406-409
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• 2003

본 논문에서는 인터넷 QoS(Quality of Service)보장을 위하여 제안된 Diff-Serv(Differentiated Service)모델을 구현하고, QoS 를 보장하지 않는 BE(Best Effort)서비스와 우선 순위가 높은 패킷을 처리하여 QoS 를 보장하는 EF(Expedited Forwarding) 서비스의 차이를 통하여 Diff-Serv 망의 우수성을 입증하고자 한다. Diff-Serv 망은 BB(Bandwidth Broker)와 에지라우터 그리고 다수의 코어라우터로 구성된다. BB 로부터 라우터에 QoS Policy를 전송하기 위하여 COPS(Common Open Policy Service) 프로토콜을 구현하였으며, 사용자와 BB 사이의 SLAT/RAR(Service Level Agreement/Resource Allocation Request)를 처리하기 위하여 Admission Control 이라는 명명한 자체 프로토콜을 개발하였다. 구현된 Diff-Serv 망에서 QoS 보장 테스트를 위하여 19.2Mbps 대역폭이 요구되는 HDTV 스트리밍 서비스를 이용하여 인위적으로 Background Traffic 을 발생시켰을 때, BE 서비스만을 지원하는 망에서는 현저하게 서비스의 질이 떨어지는 반면에 Diff-Serv 망에서는 QoS가 보장됨을 알 수 있었다.

• Journal of KIISE:Information Networking
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• v.34 no.1
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• pp.73-80
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• 2007

This paper presents an approach to support dynamic QoS(Quality of Service) requirements of largely emerging SIP(Session Initiation Protocol) multimedia applications in broadband access networks. The topology of QoS-enabled broadband access networks and its operational model to support SIP QoS are firstly suggested. And then the procedures to bind QoS-enabled SIP signaling into an IP QoS mechanism are presented. In this paper, DiffServ-based IP QoS architecture is deployed due to the complexity problem of the other IntServ architecture, and COPS(Common Open Policy Service) and COPS-PR protocol based signaling mechanisms are used to support dynamic DiffServ QoS, correspondent with dynamic SIP QoS. The broadband access network is assumed to support rapidly expanding Metro Ethernet 802.1 D/Q QoS, and how to translate SIP QoS parameters into IP DiffServ classes and DiffServ classes into 802.1 D/Q QoS parameters is also presented in this paper.

• The Journal of the Korea Contents Association
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• v.10 no.4
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• pp.45-54
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• 2010

In this paper, we propose a quality interworking control system to enhance user's quality satisfaction in NGN environment by controling QoS parameters related with QoE in network layer when service user's QoE using variance multimedia service is poor. The proposed system gathers QoS parameter information in network layer through control packet such as RTCP, and evaluates QoE of multimedia service using these QoS parameter information. Comparing the evaluated QoE with the measured QoE in application layer, QCS judges quality degradation, deduces related QoS parameters and decides relative importance of each parameter when QoE is lower than threshold value. QCS generates QoS control values which is based on routing and switching policy in service quality control system(SCS) and forwards them to SCS. Through this proposed system, service and network providers can provide multimedia services of enhanced quality to service users taking account of service characteristic and network performance.

• Journal of Communications and Networks
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• v.15 no.3
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• pp.301-311
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• 2013

This paper proposes a policy-based quality of service (QoS) management framework for adaptive routing decisions. We present an approach considering interior gateway protocol (IGP) for path discovery mechanisms and QoS-aware policies for configuring the network elements. The integration of the aforementioned modules into this policy-based network management (PBNM) system is demonstrated by conducting experiments in a real environment, the hellenic public administration network SYZEFXIS. These experiments combine different traffic conditioning mechanisms through event detectors, consider IP service level agreement mechanisms that interoperate with the PBNM system and analyze the enforcement of IGP and QoS policies. Finally, validation and measurement tools are used to prove the efficiency of this framework. It is shown that this architecture offers significantly increased performance and learning capabilities, while the PBNM system achieves adaptive QoS routing through automated configuration considering the avoidance of suboptimal routing issues or under-performance conditions of the network entities.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.31 no.4B
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• pp.349-354
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• 2006

In 3G networks interworking with external IP-based networks, provision of end-to-end QoS to packet-based services is a critical issue. In this paper, we propose DiffServ-aware Multiple Protocol Label Switching(MPLS) as a new policy enforcement means. With the adoption of the proposed DiffServ-aware MPLS, it is feasible to provide differentiated QoS provision with the help of DiffServ as well as to improve network utilization by using multiple paths based on MPLS. We verify the effectiveness of our proposed policy enforcement means through a simulation in which realtime traffic and non-realtime traffic are served together.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04d
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• pp.647-649
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• 2003

인터넷의 폭발적인 성장으로 인터넷을 사용하는 사용자 및 애플리케이션들이 급속하게 등장하였다. 그로 인하여, 스트리밍 서비스 또는 time-sensitive한 애플리케이션들의 QoS를 보장하기 위한 여러 가지 QoS 연구들이 진행중이다. 시스코를 중심으로 한 기업망에서의 Policy Networking 기반의 서비스들이 점점 더 발전되어가고 있다. 즉, 시스코 라우터에서는 이를 지원하기 위한 filtering, Coloring, Policy 등의 명령어를 지원하게 되었다. 그러므로, 이것들을 운영하는 관리자들은 Dos 정책을 자동으로 분배, 적용, 모니터링, 리포팅 기능을 제공하는 자동화된 네트웍 관리도구들에 대한 요구들이 증가하고 있다. 시중에 나와 있는 시스코 제품들은 가격이 너무 비싸고, 관리자들의 요구 사항과는 약간의 거리감이 있다. 따라서, 이 논문에서 시스코 라우터 기반의 자동화된 QoS 정책 분배 시스템의 설계 및 구현 결과를 소개하고자 한다.