• The Journal of Korean Institute of Communications and Information Sciences
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• v.26 no.5A
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• pp.809-816
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• 2001

본 논문에서는 사용자 수의 증가에 민감하지 않은 안정적인 인터넷 서비스를 위한 매체접근제어 프로토콜을 제안하고자 한다. 제안하는 프로토콜에서는 짧은 시간동안 적은 양의 데이터가 발생하는 상향채널 인터넷 트래픽의 특성 및 음성과 데이터 연결이 동시에 설정되는 다중 세션 모드를 활용하여 음성 트래픽 채널을 통해 상향채널 인터넷 트래픽을 전송할 수 있는 방안을 제시한다. 수학적 분석 시뮬레이션 결과는 다중세션 하에서 제안하는 매체접근제어 프로토콜을 적용할 경우 높은 시스템 부하에서도 안정된 인터넷 서비스 제공이 가능함을 보인다.

• Review of KIISC
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• v.8 no.1
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• pp.99-112
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• 1998

ATM 방식을 근간으로 한 광대역 통신망의 급속한 발전에 따라 점차로 그 수요가 증가할 데이터 응용들을 위한 ABR서비스는 우선 순위가 높은 다른 서비스들이 이용하고 남는 가용 대역폭을 최대한 활용해야 한다. 따라서 최근까지도 피드백을 이용한 대응적 제어를 이용한 폭주 제어 방식들에 대한 연구가 진행되어왔고 여러 알고리즘들이 제안되었다. 본 논문에서는 ATM망에서의 ABR(Available Bie-Rate) 트래픽의 특성과 ATM포럼과 ITU-T등에서 표준화되었거나 현재 연구중인 다양한 제어 기법들에 대한 개괄적인 분석이 수행되었다. 그와 아울러 각 알고리즘들의 장, 단점을 살펴보고 개선되어야 할 사항들을 제시하였으며 좀 더 효듈적인 제어를 위해 고려되어야 할 트래픽 특성들을 설명하고 있다.

• Journal of the Korea Society of Computer and Information
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• v.6 no.1
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• pp.45-50
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• 2001

Congestion may take place in the ATM network because of high-speed cell transmission features, and cell delay and loss also can be caused by unexpected traffic variation. Thus. traffic control mechanisms are needed. One of them to decrease congestion is the cell shaping. This paper proposes a hybrid type cell shaper composed of a Leaky Bucket with token pool, EWMA with time window, and a spacing control buffer. The simulator BONeS with the ON/OFF traffic source model evaluates the performance of the proposed cell shaping method. Simulation results show that the cell shaping concerning the respective source traffics is adapted to and then controlled on the mean bit rate.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.9 no.1
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• pp.65-75
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• 2005

Measurement of network traffic have shown that the self-similarity is a ubiquitous phenomenon spanning across diverse network environments. In previous work, we have explored the feasibility of exploiting the long-range correlation structure in a self-similar traffic for the congestion control. We have advanced the framework of the multiple time scale congestion control and showed its effectiveness at enhancing performance for the rate-based feedback control. Our contribution is threefold. First, we define a modular extension of the TCP-a function called with a simple interface-that applies to various flavours of the TCP-e.g., Tahoe, Reno, Vegas and show that it significantly improves performance. Second, we show that a multiple time scale TCP endows the underlying feedback control with proactivity by bridging the uncertainty gap associated with reactive controls which is exacerbated by the high delay-bandwidth product in broadband wide area networks. Third, we investigate the influence of the three traffic control dimensions-tracking ability, connection duration, and fairness-on performance.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.18 no.8
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• pp.1190-1200
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• 1993

In this work, the performance of both delay sensitive traffics and loss sensitive traffics of the output buffered ATM switch with priority control mechanisms has been evaluated. We choose the partial buffer sharing mechanism as the loss priority control mechanism and the HOL(Head Of Line) priority control mechanism as the time priority control mechanism. We model loss sensitive traffics with Poisson process and delay sensitive traffics with MMPP. With loss priority control, it is confirmed that loss probability of loss sensitive traffice decreases when the loss priority control mechanism is chosen. With time priority control, it has also been confirmed that mean cell delay of delay sensitive traffics decreases when the HOL priority control mechanism is used. From this analysis, It has been confirmed that the requirements of QOS for both loss sensitive and delay sensitive traffics can be satisfied in the ATM switch by combining both the loss priority control mechanism and the HOL priority control mechanism.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2013.06a
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• pp.47-49
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• 2013

본 논문에서는 기존 중앙집중형 방식의 텔레프레즌스 시스템에서의 확장성 문제를 해결하기 위해서 미디어 트래픽을 분산해서 처리 할 수 있는 구조와 서비스를 확장하기 위해서 제어 플랜과 미디어 플랜을 분리하는 구조를 제안하고자 한다. 트래픽 분산 기술을 적용한 텔레프레즌스는 제어 플랜과 미디어 플랜이 분리되어 수행하기 때문에, 트래픽 분산 및 서비스 확장에 용이하며, 여러 개의 미디어 분산 처리기(DP)가 클라이언트의 트래픽을 나누어서 중계하고 전달하기 때문에, 중앙집중형 텔레프레즌스 구조에 비해서 어느 한 시스템에 많은 트래픽이 집중되지 않는다. 또한, 서버에서 클라이언트로 직접 트래픽이 전달되지 않고 미디어 분산 처리기와 미디어 분산 처리기 사이에 트래픽이 우선 전달되고, 로컬에서 트래픽이 복사되어 여러 개의 클라이언트로 전달되기 때문에 네트워크 코아망에서의 트래픽을 감소시키는 장점이 있다.

• 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.

• The KIPS Transactions:PartC
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• v.15C no.2
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• pp.87-92
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• 2008

This paper proposes a session control model for the P2P(Peer to Peer) IPTV(Internet Protocol Television) services and presents the IPTV session control procedures based on the proposed model. Since, while public IPTV traffic is usually processed via a separate network, P2P IPTV traffic is processed together with the conventional Internet access traffic, the P2P IPTV control mechanism needs to provide multi-stream processing for the constituent TPS(Triple Play Service) traffic and corresponding QoS(Quality of Service) control functions. Besides, P2P IPTV session control mechanism should provide appropriate multicast control functions in order to support effective transmission of video traffic generated by personal IPTV broadcasters. The P2P IPTV session control model proposed in this paper is designed to be based on the standard SIP(Session Initiation Protocol), IGMP(Internet Group Management Protocol), and COPS(Common Open Policy Service) protocol so that it can contribute to the easy and prompt deployment of inter-operable P2P IPTV platform.

• Journal of KIISE:Information Networking
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• v.34 no.2
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• pp.81-87
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• 2007

This paper proposes architecture of Linux-based Network Traffic Control Test-bed (NTCT) that easily implements reconfigurable network environment. The proposed NTCT consists of traffic generator that uses the simulation results of NS2 simulator, traffic controller using Linux kernel, and traffic monitor. This paper also includes the analysis example using the proposed NTCT.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.8A
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• pp.868-878
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• 2004

In this paper, we analyse feasibility of Zone-based Power Control (ZPC) scheme introduced for CDMA forward link(1) in the reverse link. To operate ZPC scheme in the CDMA systems the maximum power level that can be allocated to each traffic channel should be determined. Because all the service channels share the whole power resource in the forward lint a specific mechanism that determines Maximum power resource to each traffic channel is required to operate ZPC scheme in the forward link. However, ZPC scheme can be easily adopted to the reverse link, because of the fact that the whole power resource of service terminal is only confined to its traffic channel. In other words, we need not to determine the maximum power resource to be allocated in the reverse traffic channel. Simulation results show that ZPC scheme adopted to the reverse link yields a significant performance improvement compared with the conventional TPC(IS-95 TPC) scheme in terms of the power consumption and the traffic capacity of Portables, especially with the increasing number of high-rate data traffics. With the proposed scheme, not only be extended the service coverage of high-rate data traffic to the entire cell service coverage, but also the QoS of low-rate traffic can keep going through the service time, especially, in the situation that the incoming interference is much larger.