• Title/Summary/Keyword: VBR

Search Result 241, Processing Time 0.023 seconds

An Optimal parameter selection Algorithm for standard-compatible traffic descriptors for multimedia traffic (멀티미디어 트래픽을 위한 서비스 품질 보장형 망의 최선형 표준 트래픽 기술자 계산 방식)

  • Ahn Heejune;Oh Hyukjun
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.30 no.5A
    • /
    • pp.370-375
    • /
    • 2005
  • While the international standards bodies recommend the dual leaky buckets for the traffic specification for VBR service, video traffic shows burstiness in multiple time-scales. In order to fill this gap between the current standards and real traffic characteristics, we present a standard-compatible traffic parameter selection method based on the notion of a critical time scale (CTS). Since the defined algorithm minimizes the required link capacity under a maximum delay constraint, it could be used as a benchmark even when it can not be implemented easily. Simulation results with compressed video traces demonstrate the efficiency of the defined traffic parameter selection algorithm in resource allocation.

A Study on The Unsafe Packet Drop and Delay of Multimedia Traffics (멀터미디어 트래픽의 비보안 패킷 폐기와 지연에 관한 연구)

  • Lim Chung-Kyu
    • Journal of the Korea Society of Computer and Information
    • /
    • v.10 no.6 s.38
    • /
    • pp.227-232
    • /
    • 2005
  • A network of Packet based switch Mode will be required to carry the traffics(CVR,VBR, UBR, ABR) generated by a wide range of services. Packet based Network services the quality-of-Service (QoS) management of traffic sources and bandwidth. Besides efficiency and throughput services are achieved in the multimedia traffic sent in the network. In this paper. the scheduler transmits the safe packet, drop the unsafe packet and evaluate unsafe packet as the requirement of the delay avoiding the network congestion for improving the QoS of the multimedia network In this paper. we Propose the scheduling algorithm which evaluates and drops the packet . The suggested model performance of the switch is estimated and simulated in terms of the delay by computer.

  • PDF

Transmission Performance of Application Traffics on High Speed Railway Communications (고속철도통신에서 응용 트래픽의 전송성능)

  • Kim, Young-Dong
    • The Journal of the Korea institute of electronic communication sciences
    • /
    • v.12 no.5
    • /
    • pp.771-776
    • /
    • 2017
  • LTE-R mobile communication technology based on LTE is used to supply various signal and exchange information required for safety operation of train on high speed railway communication system. In this paper, transmission performance of application traffic which is transferred on high speed communication based on LTE-R is analyzed. And some suggestions for application traffic transmission of high speed railway communication will be considered. Computer simulation is used to analyze performance of CBR, VBR as application traffic. Throughput, delay and packet loss rate is used as performance measurement and analysis parameters.

A Study on the World Wide Web Traffic Source Modeling with Self-Similarity (자기 유사성을 갖는 World Wide Web 트래픽 소스 모델링에 관한 연구)

  • 김동일
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.6 no.3
    • /
    • pp.416-420
    • /
    • 2002
  • Traditional queueing analyses are very useful for designing a network's capacity and predicting there performances, however most of the predicted results from the queueing analyses are quite different from the realistic measured performance. And recent empirical studies on LAN, WAN and VBR traffic characteristics have indicated that the models used in the traditional Poisson assumption can't properly predict the real traffic properties due to under estimation of the long range dependence of network traffic and self-similarity In this parer self-similar characteristics over statistical approaches and real time network traffic measurements are estimated It is also shown that the self- similar traffic reflects network traffic characteristics by comparing source model.

A Cell Scheduling Algorithm based on Multi-Priority in ATM Network (ATM망에서 다중우선순위 기반의 셀 스케줄링 알고리즘)

  • 권재우;구본혁;조태경;최명렬
    • Journal of Korea Multimedia Society
    • /
    • v.4 no.4
    • /
    • pp.339-348
    • /
    • 2001
  • In this paper, a cell scheduling algorithm which can be applied to all of the service class in ATM network is proposed. The proposed algorithm classifies the order of priority in each service class into 4 categories and generates the weight of each class service based on the traffic parameters which are negotiated in connection contract. The proposed algorithm guarantees QoS(Quality of Service) to the traffic which is sensitive to delay carrying out CBR and rt_VBR service. As it effectively manages the connection which has small bandwidth, it minimizes the cell delay in the queue. For verifying the effectiveness of the proposed algorithm the proposed algorithm is simulated with existing cell scheduling algorithm and the result is showed.

  • PDF

A Study on the optimization design of ATM network Using Internet Traffic Characteristics (인터넷 트래픽 특성을 이용한 ATM 망의 최적설계에 관한 연구)

  • 최삼길;김동일
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.6 no.4
    • /
    • pp.574-581
    • /
    • 2002
  • Traditional queueing analyses are very useful for designing a network's capacity and predicting their performances, however most of the predicted results from the queueing analyses are quite different from the realistic measured performance. And recent empirical studies on LAN, WAN, and VBR traffic characteristic have indicated that the models used in the traditional Poisson assumption cannot properly predict the real traffic properties due to underestimation of the long-range dependence of network traffics and self-similar properties. In this paper, It is also shown that the self-similar traffic reflects real Ethernet traffic characteristics by comparing Pareto-like ON/OFF source model which is exactly self-similar model to the traditional Poisson model. It is also performed optimization design and performance analysis of ATM network using Internet traffic characteristics.

A Study on The UnSafe Packet Drop and Delay of Multimedia Traffics (멀티미디어 트래픽의 비보안 패킷 폐기와 지연에 관한 연구)

  • Lim Chung-Tyu
    • Journal of the Korea Society of Computer and Information
    • /
    • v.10 no.5 s.37
    • /
    • pp.245-250
    • /
    • 2005
  • A network of Packet based switch Mode will be required to carry the traffics(CVR,VBR, UBR, ABR) generated by a wide range of services. Packet based Network services the Qualify-of-Service (QoS) management of traffic sources and bandwidth. Besides efficiency and throughput services are achieved in the multimedia traffic sent in the network. In this paper, the scheduler transmits the safe packet, drop the unsafe packet and evaluate unsafe Packet as the requirement of the delay avoiding the network congestion for improving the QoS of the multimedia network. In this paper, we Propose the scheduling algorithm which evaluates and drops the packet The suggested model Performance of the switch is estimated and simulated in terms of the delay by computer.

  • PDF

A Study on the Delays of Security Packet for ATM Network (ATM 망의 보안 패킷 지연에 관한 연구)

  • Lim Chung-Kyu
    • Journal of the Korea Society of Computer and Information
    • /
    • v.9 no.4 s.32
    • /
    • pp.173-178
    • /
    • 2004
  • A network of Asynchronous Transfer Mode (ATM) will be required to carry the traffics(CVR, VBR, UBR. ABR) generated by a wide range of services ATM services the Quality-of-Service (QoS) management of traffice sources and bandwidth. Besides efficiency and throughput, the security services are achieved in the traffic sent in ATM network. In this paper, the scheduler evaluate and the packets sent in ATM security group. The scheduler transmits the safty packet, drop the unsafty packet and evaluate mark packet as the requirement of the delay. In this paper, we propose the scheduling algorithm of mark packet which evaluates the packet. The suggested model performance of the firewall switch is estimate simulation in terms of the delay by computer.

  • PDF

(An Efficient Transmission Rate Control Algorithm for MPEG VOD Service) (MPEG 동영상 서비스를 위한 효율적인 전송률 조절 알고리즘)

  • 이면재;곽준원;송하윤;박도순
    • Journal of the Korea Computer Industry Society
    • /
    • v.3 no.8
    • /
    • pp.1027-1038
    • /
    • 2002
  • Multimedia data services have been widely developed with the recent progression of the Internet technology. Multimedia services, especially, must guarantee Quality of Service with restricted environment resources. The abrupt increase of transmission quanta, so called burst, and the number of client that access multimedia server, with limited network bandwidth will demage the quality of service and the utilization of network resource. Smoothing techniques can reduce the burst of a variable bit rate stream by transmitting data at a series of fixed rates. In this paper, we present a new smoothing algorithm using MPEG's characteristics in transmitting stored video data with VBR. The smoothing algorithm we present will be verified with assorted existing techniques in diverse environments.

  • PDF

Optimizing Bit Rate Control for Realtime TV Broadcasting Transmission using LTE Network (LTE 무선통신을 활용한 TV 생방송 중계화면 안정화 비트레이트 조정 연구)

  • Kwon, Mahnwoo;Lim, Hyunchan
    • Journal of Korea Multimedia Society
    • /
    • v.21 no.3
    • /
    • pp.415-422
    • /
    • 2018
  • Advances of telecommunication technology bring various changes in journalism field. Reporters started to gather, edit, and transmit content to main server in media company using hand-held smart media and notebook computer. This paper tried to testify valid bit-rate of visual news content using LTE network and mobile phone. Field news like natural disasters need real-time transmission of video content. But broadcasting company normally use heavy ENG system and transmission satellite trucks. We prepared and experimented different types of visual content that has different bit-rates. Transmission tool was LU-60HD mobile system of LiveU Corporation. Transmission result shows that bit-rate of 2Mbps news content is not suitable for broadcasting and VBR (Variable Bit Rate) transmission has better definition quality than CBR (Constant Bit Rate) method. Three different bit-rate of VBR transmission result shows that 5Mbps clip has better quality than 1Mbps and 3Mbps. The higher bit-rate, the better video quality. But if the content has much movements, that cause delay and abnormal quality of video. So optimizing the balance between stability of signal and quality of bit-rate is crucial factor of real-time broadcasting news gathering business.