• 디지털산업정보학회논문지
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• 제7권2호
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• pp.47-58
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• 2011

Snoop was suitably designed for wired and wireless network as having snoop agent module in BS(Base Station) which is connecting to both wired and wireless network in order to supplement the problems of TCP. This study examined performance difference by using the web traffic taken wide possession in current internet traffic. The web traffic has greater amount of traffic, shorter life time, and smaller size than other traffics. This study found that snoop producing performance improvement of wireless network in the network mixed with the wired and wireless lead performance loss when transmitting web traffic. This study found that in case of web traffic is transmitted it bring a performance improvement of web traffic as computing BWE((Bandwidth Expansion), and also found that this study prove of performance improvement by decreasing local retranmission.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2006년도 하계종합학술대회
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• pp.1035-1036
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• 2006

We analyzed the performance of hierarchical cellular system with multi traffic(voice traffic, data traffic). We executed the computer simulation by the various ratio of traffic generation(voice traffic, data traffic). We generated data traffic at microcell. The more voice traffic generated, the higher the block probability of data traffic became at macrocell.

• 한국통신학회논문지
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• 제33권5B호
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• pp.344-355
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• 2008

본 논문에서는 차등서비스 망의 성능 평가 문제를 다룬다. 성공적인 성능 평가를 위하여 적절한 트래픽 모델에 의하여 네트워크상의 실제 트래픽을 정확히 나타낼 수 있는 능력이 필수 요소이다. 실제 트래픽 측정의 성질에 대한 많은 연구 결과는 웹과 텔넷, P2P 트래픽을 포함하여 인터넷 트래픽에 대한 장기간-의존성을 증명하였다. 장기간 의존성은 자기유사성에 의하여 효과적으로 표현될 수 있다. 본 논문에서는 중첩된 On-Off 소스 모델, FFT-FGN 모델과 RMD 모델에 대한 특성 분석을 기반으로, 중첩된 On-Off 소스 모델을 이용하여 자기유사트래픽 발생기를 설계하고 구현한다. 생성된 트래픽의 자기유사성은 TCPdump 데이터의 패킷 도착 간격을 조사하여 확인하였다. 또한 구현된 트래픽 발생기를 차등서비스 망의 성능평가에 적용하여 On/Off 모델의 $\alpha$ 값에 대한 성능이 영향과, CBQ(Class-Based Queueing)에 의한 EF(Expedited Forwarding)/BE(Best Effort) 클래스 트래픽의 성능을 관찰한다.

• IEIE Transactions on Smart Processing and Computing
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• 제1권3호
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• pp.182-191
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• 2012

This paper proposes a high performance QoS (Quality of Service) traffic transmission scheme to provide real-time multimedia services in wireless networks. This scheme is based on both a traffic estimation of the mean rate and a header compression method by dividing this network model into two parts, core RTP/UDP/IP network and wireless access parts, using the IEEE 802.11 WLAN. The improvement achieved by the scheme means that it can be designed to include a means of provisioning the high performance QoS strategy according to the requirements of each particular traffic flow by adapting the header compression for real-time multimedia data. A performance evaluation was carried out to show the effectiveness of the proposed traffic transmission scheme.

• 대한산업공학회지
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• 제23권1호
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• pp.23-37
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• 1997

In this paper, performance analysis of video traffic shaper for Motion Picture Experts Group (MPEG) video traffic in on ATM network are investigated. Traffic shaping for MPEG video traffic is proposed as a traffic control function in ATM networks. The proposed shaper smoothes video traffics by controling the output rate of the buffer, which is placed in an MPEG source, according to I,B,P frame sequences of MPEG. In performance analysis of an video traffic shaper, a periodic botch arrival model is suggested to describe cell streams in a frame of MPEG video traffic. The queueing model which has periodic independent botch arrival and periodic deterministic service time is used to obtain the cell loss ratio, the mean cell delay, and the measure of smoothing effect. Simulation results are used to validate this queueing model. The cell loss performance of ATM multiplexer is measured by simulation study with real MPEG-1 data. From the viewpoint of traffic load, the cell loss ratio is observed to be considerably high, which is considered to result from the burstiness of MPEG video traffic. As a result, it is shown that the shaping decreases cell loss ratio of multiplexer. The results of this paper can be employed to establish a basic guideline in the implementation of a traffic control scheme and the design of ATM multiplexer for MPEG video traffic.

• 한국통신학회논문지
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• 제19권11호
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• pp.2215-2227
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• 1994

단일 교환기로 다양한 유형을 효율적으로 지원할 수 잇는 멀티캐스트 교환기는 광대역 종합망의 성공적인 확산에 필요 불가결한 요소이다. 본 논문에서는 멀티캐스트 교환기에서 이질적 트래픽이 혼합된 환경을 가정하고 회선 에뮬레이션 트래픽의 성능을 분석하였다. 기존의 연구에서, 모든 호가 동일한 fan-out을 갖는 동질 트래픽 환경에서 fan out이 증가함에 따라 호 불통률이 급격히 증가하는 것이 관찰되었다. 본 논문에서는 fan-out이 서로 다른 호가 혼합된 이질 트래픽 환경에서는 fan-out에 따른 호 불통률 차이가 동절 트래픽 경우보다 오히려 증가하는 결과를 도출하였다. 이 결과는 멀티캐스트 교환기에서 멀티캐스트 호의 성능을 향상시키기 위한 효율적인 자원 할당 알고리듬을 사용해야 한다는 것을 지적하고 있다. 본 논문에서는 멀티캐스트 교환기의 성능을 향상시킬 수 있는 몇가지 방안을 제시하였다.

• 한국경영과학회지
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• 제30권2호
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• pp.29-40
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• 2005

In this research, we propose packet scheduling algorithm considering different QoS characteristics of real-time traffic and non-real-time traffic in the next generation wireless communication system serving the multimedia traffic and a new efficient framing method cooperated with this packet scheduler. When the selected traffic classes of the selected users are transmitted, our proposed framing method can increase the number of serviced traffic classes by mixing the many different traffic classes within one frame considering data rate decided by the allocated AMC (Adaptive Modulation and Coding) option. Using this proposed method, the fairness among the traffic classes can be achieved and the system performance for total throughput and delay can be enhanced. Simulations are performed to analyze the performance of the proposed framing method. Our proposed packet scheduler and framing method will be applied to the next generation multimedia wireless communication system serving many traffic classes.

• 정보통신설비학회논문지
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• 제1권1호
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• pp.51-64
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• 2002

This paper analyzes performance measures of a Bluetooth_based mobile home network system. The home network system consists of terminals with Bluetooth interfaces, access points (AP), a home PC, and a gateway A mobile host in wireless terminals uses Mobile IP for supporting the mobility This paper considers four types of data traffic, which are new connection traffic, handoff traffic, Internet data traffic, and control data traffic and suggests a queueing system model of the home network system, where the AP and the home PC are modeled as M/G/1 with four priority queues and the gateway is modeled as M/G/1 with a single queue The generation rate and service time of individual traffic influence their performance measures. Based ell the suggested model, we propose the elapsed time of data traffic in terms of the number of cells, the number of Home PCs, arrival rates of four types of traffic and the service rates of AP/Home PCs/Gateway To analyze influences on the elapsed time with respect to arrival rate of four types of traffic, some examples are given.

• 대한산업공학회지
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• 제29권2호
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• pp.135-144
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• 2003

Traffic performance in a microcellular system is much more affected by cell dwell time and channel holding time in each cell. Cell dwell time of a call is characterized by its mobility pattern, i.e., stochastic changes of moving speed and direction. Cell dwell time provides important information for other analyses on traffic performance such as channel holding time, handover rate, and the average number of handovers per call. In the next generation mobile communication system, the cell size is expected to be much smaller than that of current one to accommodate the increase of user demand and to achieve high bandwidth utilization. As the cell size gets small, traffic performance is much more affected by variable mobility of users, especially by that of pedestrians. In previous work, analytical models are based on simple probability models. They provide sufficient accuracy in a simple second-generation cellular system. However, the role of them is becoming invalid in a picocellular environment where there are rapid change of network traffic conditions and highly random mobility of pedestrians. Unlike in previous work, we propose an improved probability model evolved from so-called Random walk model in order to mathematically formulate variable mobility of pedestrians and analyze the traffic performance. With our model, we can figure out variable characteristics of pedestrian mobility with stochastic correlation. The above-mentioned traffic performance measures are analyzed using our model.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 추계종합학술대회 논문집(1)
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• pp.29-32
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• 2000

MPLS stands for “Multi-protocol Label Switching”. It's a layer 3 switching technology aimed at greatly improving the packet forwarding performance of the backbone routers in the Internet or other large networks. We compare the performance of unlabeled IP traffic and labeled IP traffic. In this paper, by varying the packet rate and measuring throughput of the flows we analyze the performance of labeled IP packet traffic and unlabeled IP packet traffic in IP over MPLS.