• Proceedings of the Korean Information Science Society Conference
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• 2003.04a
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• pp.857-859
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• 2003

본 논문에서는 웹 기반의 사이버 강의 시스템을 이용하여 사용자가 인터넷을 통해 교육을 제공 받을 때 발생하는 트래픽을 측정 분석하고 강의에서 제공되는 동영상, 음성 및 문서 등의 멀티미디어 컨텐츠들이 대역폭에 미치는 영향을 분석한다. 또한 강의형태에 따라 트래픽 모델을 제시하고 강의 컨텐츠의 구성에 따라 달라지는 전송대역폭과 사용자수에 따른 영향을 분석한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2018.10a
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• pp.8-10
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• 2018

우리는 5G 시대를 눈앞에 두고 있다. 5G는 더 빠른 것뿐만이 아니라, 더 저렴한 데이터 서비스를 제공하게 된다. 하지만 4G는 이동 통신망이 모바일 단말 간의 통신에 최적화된 망 구조였다면, 5G는 서로 다른 속성을 갖는 다양한 대상에게 서비스를 제공해주어야 한다. 이 환경에서 스마트폰을 기반으로 한 모바일 통신은 5G 통신망의 비주류 통신영역이 되며, 전체적인 할당량 또한 줄어들 것이다. 이때 통신망의 제약으로 인해 통화장애가 발생한다면 이를 효과적으로 관리하여 통화자체가 끊어지지 않도록 유지할 수 있어야 한다. 본 논문에서는 VoIP를 기반으로 한 통화 트래픽 제어 전략을 제시한다. 5G의 빠른 속도와 VoIP의 음성코덱 제어를 통해 순간 통화 연결시도가 늘어 트래픽의 한계상황에서도 서비스가 끊어지지 않고 유지될 것이다.

• Proceedings of the Korea Information Processing Society Conference
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• 2000.04a
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• pp.428-433
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• 2000

IMT-2000에서는 음성 트래픽뿐만 아니라 데이타, 화상, 비디오와 같은 멀티미디어 트래픽을 지원함으로서 더 많은 무선 대역폭이 요구된다. 특히 멀티미디어 데이타의 전송 중에 핸드오프가 발생한다면, 기지국은 멀티미디어 데이타의 QoS를 유지하기 위하여 효율적인 대역 할당 및 핸드오프 방안이 필요하다. 본 논문에서는 IMT-2000 환경에서 이동체의 이동 방향을 추정하여 이를 근거로 대역폭을 예약하고, 멀티미디어 트래픽을 전송하는 핸드오프 기법을 제안한다. 이 기법은 섹터 추정과 존 추정으로 구성된 2 단계 추정에 근거하여 이동체의 위치와 이동 방향을 결정하고 이를 이용하여 대역폭을 예약한다.

• The KIPS Transactions:PartC
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• v.16C no.5
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• pp.661-668
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• 2009

The Extended real-time Polling Service (ErtPS) is proposed tosupport QoS of VoIP service with silence suppression which generates variable size data packets in IEEE 802.16e systems. If the silence is suppressed, VoIP should support Comfort Noise Generation (CNG) which generates comfort noise for receiver's auditory sense to notify the status of connection to the user. CNG mode in silent-period generates a data with lower bit rate at long packet transmission intervals in comparison with talk-spurt. Therefore, if the ErtPS, which is designed to support service flows that generate data packets on a periodic basis, is applied to silent-period, resources of the uplink are used inefficiently. In this paper, we proposed the Improved ErtPS algorithm for efficient resource utilization of the silent-period in VoIP traffic supporting CNG. In the proposed algorithm, the base station allocates bandwidth depending on the status of voice at the appropriate interval by havingthe user inform the changes of voice status. The Improved ErtPS utilizes the Cannel Quality Information Channel (CQICH) which is an uplink subchannel for delivering quality information of channel to the base station on a periodic basis in 802.16e systems. We evaluated the performance of proposed algorithm using OPNET simulator. We validated that proposed algorithm improves the bandwidth utilization of the uplink and packet transmission latency

• Journal of Korea Multimedia Society
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• v.13 no.4
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• pp.594-600
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• 2010

Many studies are DDoS in Internet network, but the study is the fact that is not enough in a voice network. Therefore, we designed the extended TRW algorithm that was a DDoS attack traffic detection algorithm for the voice network which used an IP data network to solve upper problems in this article and evaluated it. The algorithm that is proposed in this paper analyzes TRW algorithm to detect existing DDoS attack in Internet network and, design connection and end connection to apply to a voice network, define probability function to count this. For inspect the algorithm, Set a threshold and using NS-2 Simulator. We measured detection rate by an attack traffic type and detection time by attack speed. At the result of evaluation 4.3 seconds for detection when transmitted INVITE attack packets per 0.1 seconds and 89.6% performance because detected 13,453 packet with attack at 15,000 time when transmitted attack packet.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.18 no.9
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• pp.1304-1314
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• 1993

During the last several years, the demand of mobile communication is increasing rapidly due to the convenience of usage. Therefore, the evoluation scenario toward the new cellular network is needed. In this paper, the future prospect of cellular network is considered, and movable-boundary TDMA/BTMA protocol is proposed as a new voice/data integrated multiple access protocol for the future cellular packet radio networks. Then, the performance of movable-bounary TDMA/BTMA protocol is analyzed and compared with that of PRMA protocol by computer simulation. In the proposed movable-boundary TDMA/BTMA protocol, the voice traffic sensitive to delay time is served by TDMA protocol and the data traffic sensitive to loss is served by BTMA protocol. Also, the boundary of voice and data can be moved adaptively by usign SYN character, control byte, voice call counter, ect. Therefore. it could be seen that the performance of movable-boundary TDMA/BTMA protocol is better than that of PRMA protocol with respect to delay and throughput.

• 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.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.8B
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• pp.707-715
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• 2003

In this paper, we propose a new MAC(Medium Access Control) protocol using Movable-boundary, which tries to guarantee Qos for multimedia traffic in the slotted CDMA system. In this scheme, the traffic scheduler assigns channel resource according to the packet priority per service class and adapts the Movable-boundary concept in which the minimum resource is assigned to each traffic class; the remaining resource if it is available can be assigned dynamically according to the temporal demand of other traffic classes. For performance analysis, we performed computer simulations to obtain throughput and packet loss rate and compared the results with Fixed-boundary system. We observed that the error rate of voice traffic could be maintained below a prescribed value while bursty traffic such as video source shares the same channel. In comparison with Fixed-boundary scheme, our protocol exhibits better throughput and packet loss rate performance.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2010.05a
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• pp.702-704
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• 2010

Wireless LAN(Local Area Network) environment to support QoS in IEEE802.11 Working Group has standardized on the IEEE 802.11e. IEEE 802.11e EDCA channel access of the high priority traffic as by raising the probability of a chance to support QoS. This is a high priority traffic than low priority traffic, channel access is not necessarily the first. Therefore, as all traffic channels, if you have the same routing path, lower priority traffic on the performance of high priority traffic, sustainable impact. As a result, EDCA, such as voice or video to guarantee QoS for multimedia applications, follow the crowd. In this paper, to solve these problems by using Multi-Interface Multi-Path Routing Algorithm is proposed. Interface for each use in IEEE 802.11e EDCA Access Category much differently by each of the Routing Path for high priority traffic and guarantee QoS.

• 전기의세계
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• v.35 no.3
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• pp.165-171
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• 1986

미래에 전개되는 정보화 사회의 근간이 될 ISDN의 구성에 핵심요소인 전전자 교환기는 음성은 물론 데이타, 화상 및 동화상 등 다양한 트래픽 특성의 통신 수요를 효과적으로 제공할 수 있어야 한다. 본 고는 교환 기술의 발전 과정, 전전자 교환기의 구성 요소 및 제어 기능, 전전자 교환기 구조의 경향을 살펴보았다.