• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.4
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• pp.2393-2398
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• 2014

Because each resource in LTE-Advanced system and network's shapes such as bandwidth, error rate change variably, it is judged that it is impossible to control service continuity with procedural, artificial, and static control method applied to the existing voice service. This research suggests a QoS management mechanism to support the service continuity effectively based on policy control. It means a method in which a subscriber's terminal collects information about its current condition and base station around, and a base station, through the data collected by monitoring inner or adjacent base station, shares related data and converges, controlling service continuity on its own.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.12A
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• pp.1380-1386
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• 2004

Future communication networks would consist of wired and wireless access networks where there would be various types of traffic services. To meet the QoS requirements of those various traffic services simultaneously, new QoS control schemes are required. Since they are simple to deploy, cheep to manage, and easy to support subscriber mobility, wireless access networks are considered here. In this paper, a wireless joint buffer management and scheduling (W-JoBS) scheme, which is a modified version of the original JoBS algorithm at error-prone wireless access networks, is proposed. W-JoBS scheme is for providing service fairness among traffic classes with service compensation and channel-state dependent packet scheduling schemes. With computer simulation, this proposed W-JoBS scheme is evaluated and the performance of W-JoBS is compared with that of the original JoBS.

• Journal of the Korea Society of Computer and Information
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• v.14 no.3
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• pp.121-131
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• 2009

BcN provides a wide variety of high-quality multimedia services such as broadcasting and communication convergence services. But the quality degeneration is observed in BcN when we use broadcasting and communication convergence service via more than one network of different internet service providers. In this paper, a QoS management system which is able to measure and maintain objectively the quality-related information in overall networks is proposed. The proposed QoS management system is tested on the pilot networks of BcN consortiums by measuring the quality of voice and video experienced by the actual users of the commercial video phone services. The result of the experiment shows that it is possible to figure out service qualify between a user and a service provider by analyzing the information from agents. The per-service traffic information collected by probes is proved to be useful to pinpoint the party responsible for the loss of the service qualify in case of the services including different service providers. As the result of the experiment, it is shown that the proposed QoS management system would play a key role of resolving the quality dispute, which is one of the important issues of QoS-guaranteed BcN.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2006.05a
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• pp.446-450
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• 2006

Recently, the advances on sensor technology increases the study on data processing oriented middleware. Usually, most of middleware uses the naive and delta method for queue management to process data effectively. But such a queue management method it is difficult to support guaranteeing of the requested quality of services because it simply discards the data in a queue when the overflow is occurred. To handle this problem, some methods for minimizing data volumes in a wireless sensor network have been studied, but most of them cause another problem that needs the huge processing time additionally with higher complexity of the proposed algorithm. In this paper, we propose a new method of delta-average queue management by applying the mean value to the exiting delta queue management method using the data differences to handle the problem of queue overflow. The proposed method has lower complexity than the others and increases the QoS of a WSN application by using mean value instead of using data discarding policy. In addition, it is designed to manage a queue effectively by controlling the range of data differences adaptively to the target sensor network environment.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.7
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• pp.1621-1630
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• 2009

There is a lot of recent research to provide services of dynamic distributed contents in P2P-based distributed environment. Distributed services of contents objects, however, have problems in QoS and dynamic management of segments. This paper proposed a new segment management method for the service of P2P-based distributed contents. The proposed method manages groups by the SGM(Segment Group Manager). The SGM manages streaming efficiently by the grouping of segments to be served in P2P environment. The segments in the same group cooperate for improved QoS using the management structure based on the distance and relationship. The distance-based management structure is for the improvement of retrieval efficiency while the relationship-based management structure is for the improvement of service ratio. The simulation results of the proposed method showed improvements in average transmission efficiency and average service rate. The improvement is 8% - 30% in average transmission efficiency and 10% - 30% in average service rate.

• Proceedings of the Korean Information Science Society Conference
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• 2006.10d
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• pp.18-23
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• 2006

높은 데이터 전송률과 넓은 전송 대역을 제공할 수 있도록 표준화 된 시스템인 IEEE 802.16d[1]시스템에서는 여러 가지 서비스 클래스들을 이용하여 QoS를 보장해 줄 수 있을 것으로 기대하고 있다. 그러나, 효율적인 QoS를 제공하기 위해서는 스케줄링에 필요한 factor들을 적절하게 설정해야 하며, 시스템의 환경에 맞도록 변경해야 한다. 따라서, 본 논문에서는 IEEE 802.16d 시스템을 simulator (NS-2) [2]에 구현하고, IEEE 802.16f [3]에서 표준화한 MIB과 QoS를 고려한 MIB (Q-MAN MIB)을 구현하여 IEEE 802.16d 시스템과 연동하도록 구축한 네트워크 관리 시스템인 Q-MAN을 소개한다. Q-MAN 네트워크 관리 시스템을 통해 IEEE 802.16d 시스템의 QoS 제공 상태에 대한 모니터링이 가능하고, 스케줄링에 필요한 설정 값을 동적으로 변경이 가능하기 때문에 IEEE 802.16d 시스템의 효율을 극대화 시킬 수 있다.

• Proceedings of the IEEK Conference
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• 2002.07c
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• pp.1685-1688
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• 2002

Application Routing Load Balancing (ARLB) is a novel load balancing mode that combines QoS routing and load balancing in per application to support QoS far real-time application based on wired network. Zone Routing Protocol (ZRP) is a recent hybrid proactive/reactive routing approach in an attempt to achieve scalability of ad-hoc network. This routing approach has the potential to be efficient in the generation of control traffic than traditional routing schemes. Up to now, without proper load balancing tools, the ZRP can actually guarantee QoS for delay-sensitive applications when congestion occurred in ad-hoc network. In this paper, we propose the ARLB to improve QoS fur delay-sensitive applications based on ZRP in ad-hoc network when congestion occurred and to be forwarding mechanism fur route coupling to support QoS for real-time applications. The critical point is that the routing metric of ARLB is originally designed for wired network environment. Therefore, we study and present an appropriate metric or cost computation routing of ARLB for recently proposed ZRP over ad-hoc network environment.

• Proceedings of the Korean Information Science Society Conference
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• 1999.10c
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• pp.427-429
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• 1999

멀티캐스트 통신환경을 이용하는 많은 응용들의 다양한 요구들을 효율적으로 관리하기 위해 제안된 통합관리모델인 IPME의 요소중 Agent 부분을 설계하고 구현한다. 제안된 IPME 구조를 기본으로, Manager-Agent-멀티캐스트 참여자의 구조에서 핵심적인 부분인 Agent 부분을 설계하고, 구현하여 멀티캐스트 환경에서의 여러 참여 송수신자들의 다양한 QoS요구들을 효율적으로 관리할 수 있게 한다. 마지막으로 구현된 Agent를 실제 멀티캐스트환경을 이용하는 화상회의 시스템에 적용하여 그 기능과 역할에 대한 타당성을 검증해 본다.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2004.07a
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• pp.156-156
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• 2004

• 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