• ETRI Journal
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• v.27 no.6
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• pp.802-805
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• 2005

A dynamic bandwidth allocation (DBA) scheme, an inter -optical network unit (ONU) bandwidth scheduling, is presented to provide quality of service (QoS) to different classes of packets in Ethernet passive optical networks (EPONs). This scheme, referred to as TADBA, is based on efficient threshold reporting from, and adaptive polling order rearranging of, ONUs. It has been shown that the network resources are efficiently allocated among the three traffic classes by guaranteeing the requested QoS, adaptively rearranging the polling orders, and avoiding nearly all fragmentation losses. Simulation results using an OPNET network simulator show that TADBA performs well in comparison to the available allocation scheme for the given parameters, such as packet delay and channel utilization.

• Proceedings of the IEEK Conference
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• 2003.11c
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• pp.105-108
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• 2003

In the next generation backbone networks based on dense-wavelength division multiplexing (DWDM), the routing and wavelength assignment with quality-of-service (QoS) recovery is essentially needed to support a wide range of communication-intensive and real-time multimedia services. This paper proposes a new dpmic routing method called as MW-MIPR (MultiWavelength-Minimum Interference Path Routing), which chooses a route that does not interfere too much with many potential future connection requests. This paper also proposes a differentiated RWA mechanisms combined with MW-MIPR algorithm to provide QoS recovery for various multimedia applications in the next generation backbone networks based on DWDM.

• Proceedings of the Korea Contents Association Conference
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• 2003.05a
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• pp.361-367
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• 2003

Ad-hoc network is a multi-hop wireless network formed by a collection of mobile nodes without the aid of any establish infrastructure and this network can provide an extremely flexible method for establishing communications for fire, safety, rescue operations, battle field or other fields requiring rapidly deployable communications with survivable, efficient dynamic networking. Recently new expended mechanism is proposed as Ad-hoc relay system, so guarantee of QoS for multimedia applications is needed more and more. In this paper, we propose ARM based QoS Distribution Monitoring Mechanism to provide Quality of Service guarantees to multimedia application with MANET.

• Annual Conference of KIPS
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• 2002.04b
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• pp.1547-1550
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• 2002

VoIP(Voice over IP) 기술을 이용한 음성 통신은 H.323과 SIP(Session Initiation Protocol)를 기반으로 빠른 확산과 기술의 발달로 점점 더 보편화되어 가고 있다. H.323에 비해 보다 간편한 SIP 프로토콜이 각광을 받고 있으나, 이것 또한, PSTN망의 전화보다는 통화품질이 떨어진다. 따라서, 실시간 음성 트래픽을 사용하는 SIP의 통화 품질의 향상을 위해 현재 나와있는 QoS 메커니즘 중에, RSVP를 이용한 SIP QoS 메커니즘을 연구하였다. 본 연구에서는 RSVP를 이용한 메커니즘 중에, RSVP 시그널링을 우선해주는 QoS Assured 확장 메커니즘에 대해서 살펴보고, 이것의 구현 방안을 제시한다.

• Proceedings of the Korean Information Science Society Conference
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• 2012.06c
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• pp.148-150
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• 2012

최근 대용량 스트림 데이터에 대한 요구사항이 발생하고 있다. 이때 모든 대용량 스트림을 실시간으로 좋은 서비스를 제공하는 것은 실제적으로 불가능하다. 즉 대용량 스트림 데이터에 대한 QoS(Quality of Service: 서비스 품질)이 중요한 이슈가 되고 있다. 이러한 QoS를 정의하기 위해서는 센서 스트림 데이터에 대한 우선순위 부여방법이 가장 원천적으로 중요한 사항이 된다. 현재 센서 네트워크상에서의 서비스 품질은 연구되고 있지만 미들웨어 레이어에서의 우선순위 부여 방법에 대한 연구가 미비하다. 센서 스트림은 자체적으로는 우선순위를 가질 수 없으므로 사용자 질의 우선순위와 센서 스트림의 발생 시간등을 고려하여 대용량 센서 스트림에 대한 우선순위를 부여하는 방법을 제안한다.

• Annual Conference of KIPS
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• 2014.11a
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• pp.241-243
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• 2014

Wi-Fi Direct는 그룹 내 임시적인 AP 역할을 하는 그룹 오너를 중심으로 그룹 클라이언트들이 1:1이나 1:N으로 연결되어 통신하는 D2D(Device to Device) 기술이다. 이러한 구조로 인해 그룹 오너는 Wi-Fi Direct 네트워크 성능에 지대한 영향을 미치지만 현재 Wi-Fi Direct 표준에는 그룹 구성을 변경하는 방안이 명시되어 있지 않다. 따라서 그룹 구성을 변경하고자 할 시 처음부터 그룹을 새로 형성해야 하며, 이로 인해 QoS(Quality of Service)가 감소하는 문제점이 있다. 따라서 본 논문에서는 그룹 구성 변경 시 QoS를 보장할 수 있는 그룹 관리 방안을 제안한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.7 no.2
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• pp.228-238
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• 2003

We believe that existing wire solutions such as HomePNA2.0 using phone lines and HomePlug using power line and wireless solution such as HomeRF are the most promising solutions, because of its cost-effectiveness. However, MAC protocols of these solutions provide only Class of Service(CoS) using priority mechanism like HomePNA and HomePlug or consider only voice among real-time traffics like HomeRF. For these reasons, we perceive the needs of the new MAC protocol which is no new wire solution and provides guaranteed Quality of Service (QoS) for not only voice but also video and audio. In light of this, we present the design and software implementation of a new MAC protocol for Home Networks. Our evaluation results of software implementation verify that proposed MAC protocol can provide low delay, low loss, and low jitter to real-time traffic by reserving bandwidth.

• Journal of Communications and Networks
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• v.12 no.6
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• pp.624-631
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• 2010

Effective traffic matrix estimation is the basis of efficient traffic engineering, and therefore, quality of service provision support in IP networks. In this study, traffic matrix estimation is investigated in IP networks and an Elman neural network-based traffic matrix inference (ENNTMI) method is proposed. In ENNTMI, the conventional Elman neural network is modified to capture the spatio-temporal correlations and the time-varying property, and certain side information is introduced to help estimate traffic matrix in a network accurately. The regular parameter is further introduced into the optimal equation. Thus, the highly ill-posed nature of traffic matrix estimation is overcome effectively and efficiently.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.44 no.10
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• pp.55-60
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• 2007

This paper proposes a fast and scalable priority queue architecture for use in high-speed networks which supports quality of service (QoS) guarantees. This architecture is cost-effective since a single queue can generate outputs to multiple out-links. Also, compared with the previous multiple systolic array priority queues, the proposed queue provides fast output generation which is important to high-speed packet schedulers, using a special control block. In addition this architecture provides the feature of high scalability.

• ETRI Journal
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• v.27 no.1
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• pp.13-21
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• 2005

Many multicast applications, such as video-on-demand and video conferencing, desire quality of service (QoS) support from an underlying network. The differentiated services (DiffServ) approach will bring benefits for theses applications. However, difficulties arise while integrating native IP multicasting with DiffServ, such as multicast group states in the core routers and a heterogeneous QoS requirement within the same multicast group. In addition, a missing per-flow reservation in DiffServ and a dynamic join/leave in the group introduce heavier and uncontrollable traffic in a network. In this paper, we propose a distributed and stateless admission control in the edge routers. We also use a mobile agents-based approach for dynamic resource availability checking. In this approach, mobile agents act in a parallel and distributed fashion and cooperate with each other in order to construct the multicast tree satisfying the QoS requirements.