• Title/Summary/Keyword: Packet buffering

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A Real Time Network Game System Based on Retransmission Mechanism of Game Command History on Wire/Wireless Environments (유.무선 환경에서의 게임명령 히스토리 재전송 기법 기반 실시간 네트워크 게임 시스템)

  • Kim, Seong-Hoo;Kweon, Young-Do;Park, Kyoo-Seok
    • Journal of Internet Computing and Services
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    • v.7 no.6
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    • pp.143-155
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    • 2006
  • In this paper, we suggest a network game system that can support video game based on multi-platform for multi-user video game, Latency occurring from the load fluctuation in realtime network game is overcomed by using an initial delay buffering scheme on client, when a real-fire game is played, and shows that stable play for a game is achieved as the result of the scheme. Also, We suggest a retransmission algorithm based on the history of game commands, and this Algorithm supplement shortcomings for packet loss and pocket error on UDP communication.

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Input-buffered Packet Switch with a Burst Head Addressable FIFO input buffering mechanism (버스트 헤더 주소 방식의 FIFO 입력 버퍼링 메카니즘을 사용하는 입력 버퍼 패킷 스위치)

  • 이현태;손장우;전상현;김승천;이재용;이상배
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.2 no.1
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    • pp.117-124
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    • 1998
  • As window sized increases, the throughput input-buffered packet switch with a window scheme improves on random traffic condition. However, the improvement diminishes quickly under bursty traffic. In this paper, we propose Burst Head Addressable FIFO mechanism and memory structure having search capability in unit of burst header to compensate the sensitiveness of the windowed scheme to bursty traffic. The performance of a input-buffered switch using the proposed Burst Header Addressable FIFO input buffer was analyzed using computer simulations. The maximum throughput of the conventional FIFO scheme approaches an asymptotic value 0.5 as mean burst length increases. The maximum throughput of the proposed scheme is greater than that of the conventional scheme for any mean burst length and window size.

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Design of Jitter elimination controller for concealing interarrival packet delay variation in VoIP Network (VoIP 네트웍에서 패킷 전송지연시간 변이현상을 없애주는 적응식 변이 제어기 제안 및 성능분석)

  • 정윤찬;조한민
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.26 no.12C
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    • pp.199-207
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    • 2001
  • We propose an adaptive shaping controller equipped with the technologies of shaping and buffering VoIP packets arriving at the receiving end by the CAM-type controller. In order to conceal interarrival packet delay variation, the conventional jitter buffers force them to be too large, thereby causing the audio quality to suffer excessive delay. However, by using our proposed method, the delay caused by shaping operation dynamically increases or decreases on the level of jitter that exists with in the IP network. This makes the delay accommodates adaptively the network jitter condition. The less jitter network has the fewer delay the shaping controller requires for jitter elimination. And the CAM-type method generally makes the shaping operation faster and leads to processing packets in as little time as can. We analyse the packet loss and delay performance dependency on the average talk ratio and the number of jitter buffer entries in shaping controller. Surprising, we show that the average delay using our shaping controller is about 70msec. This performance is much better than with the delay equalization method which forces the receiving end to delay about 60msec.

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A Network-based IPv6 Handover Scheme for Improving Multimedia Transmission Service in IEEE 802.11 Networks (IEEE 802.11 네트워크에서 멀티미디어 전송 서비스 향상을 위한 네트워크 기반 IPv6 핸드오버 기법)

  • Park, Byung-Joo;Kim, Bong-Ki;Han, Youn-Hee
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.33 no.6B
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    • pp.420-429
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    • 2008
  • Currently, IEEE 802.11 Network could not support optimized tunneling scheme and buffering scheme based on movement detection to reduce multimedia data packet loss when an MN move from current subnet to new subnet during handover. It is because IEEE 802.11 did not transfer information of movement detection to AP. In this paper, we proposed new fast handover scheme by using advanced access point and optimized snoop protocol for network based Proxy Mobile IPv6 in IEEE 802.11 Networks. During handover, the proposed scheme reduces both the multimedia data packet loss rate and the packet reordering problems without changing MN's mobility stack in IEEE 802.11 Networks.

Realization of All-Optical WDM Buffer Using Wavelength Routing (파장 라우팅 방식을 이용한 전광 WDM 버퍼 구현)

  • Choi Hoon;Eom Jin Seob
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.30 no.3A
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    • pp.153-159
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    • 2005
  • In this paper, we propose All-Optical WDM Buffer System for resolving the contention of Packets in Optical Packet Switching System. The proposed system consists of tunable wavelength converters based on SOA, N×N AWG, and fiber delay lines. This structure can reduce ASE and cross-talk noise because the contending packets are sent and buffered through each different path determined by a wavelength routing. We also performed buffering experiment for two contending WDM optical pulses with each 50ns width, and found that the contending problem is resolved well.

ServerNet and ATM Interconnects: Comparison for Compressed Video Transmission

  • Ashfaq Hossain;Kang, Sung-Mo;Robert Horst
    • Journal of Communications and Networks
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    • v.1 no.2
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    • pp.134-142
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    • 1999
  • We have developed fully functional Video Server and Client applications which can transmit, receive, decompress and display compressed video over various networks. Our video trans-port allows dynamic rate control feedback, loss detection, and repair requests from Clients to the Server. Our experiments show how feedvack-before-degradation scheme for rate adaptation maintains good display frame-rate for video playback. We show how the playback degradation(reduction in display frame-rate) oc-curs and what happens if corrective measures are not taken to im-prove the situation. The degradation is attributed to the increased internal kernel buffering which consumes scarce CPU resources. We demontrate with our experimental results that ServerNet, with improved hardware delivery guarantees, can significantly reduce host CPU resource consumption while serving video streams. We present the maximum number of streams which can be served for each of ATM and ServerNet interconnects. The appropriate user-level packet size for the video server are also determined for each case.

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All-optical Logic gate using the SOA/DFB-SOA with Broadband-Gain (광대역 이득을 가진 SOA/DFB-SOA를 이용한 전광 논리구현)

  • Kim, Young-Il;Kim, Jae-Hun;Lee, Seok;Woo, Heok-Ha;Yoon, Tae-Hoon
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.04b
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    • pp.109-111
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    • 2002
  • We have demonstrated all-opticalflip-flop based on optical bistability in a SOA/DFB-SOA with broadband gain. Input signal with the wavelength of 1340.23 nm or 1680.93 nm and the current of about 98% of the lasing threshold is injected into theDFB-SOA. Current injected into SOA is 80 mA All-optical flip-flop has various applications such as all-optical memory, demultiplexing, packet-header buffering, and retiming.

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A Multicast Switching Algorithm Based on iSLIP

  • Lee, Heyung-Sub;Lee, Sang-Yeoun;Lee, Hyeong-Ho;Kim, Whan-Woo
    • Proceedings of the IEEK Conference
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    • 2002.07b
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    • pp.1011-1014
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    • 2002
  • This paper proposes a multicast packet-switching method which can less affect QoS degradation. The method includes a switch fabric with extra switching paths dedicated for multicast packets. Presented also are both a buffering structure and a scheduling algorithm for the proposed method. Simulation analysis for the method shows that the switching delay of unicast packets is decreased even though arrival rate of multicast packets is increased.

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All-Optical WDM Buffer System realized by NOLM and Feedback Loop (NOLM과 피드백 루프에 의해 구현된전광 WDM 버퍼 시스템)

  • 이승우;윤경모;이용기;엄진섭
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.29 no.5A
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    • pp.514-520
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    • 2004
  • In WDM networt a WDM buffer is one of essential elements for realizing all-optical packet switching system. In this paper, we propose and demonstrate a single loop type all-optical WDM buffer system. The proposed one consists of NOLM and feedback loop, and provides more than 40 turns buffering (more than 20${\mu}\textrm{s}$) for single input pulse (1550nm, width: 20㎱) before selected by control signal pulse (1553nm, width: 30㎱).

A MULTIPATH CONGESTION CONTROL SCHEME FOR HIGH-QUALITY MULTIMEDIA STREAMING

  • Lee, Sunghee;Chung, Kwangsue
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.11 no.1
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    • pp.414-435
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    • 2017
  • As network adaptive streaming technology becomes increasingly common, transport protocol also becomes important in guaranteeing the quality of multimedia streaming. At the same time, because of the appearance of high-quality video such as Ultra High Definition (UHD), preventing buffering as well as preserving high quality while deploying a streaming service becomes important. The Internet Engineering Task Force recently published Multipath TCP (MPTCP). MPTCP improves the maximum transmission rate by simultaneously transmitting data over different paths with multiple TCP subflows. However, MPTCP cannot preserve high quality, because the MPTCP subflows slowly increase the transmission rate, and upon detecting a packet loss, drastically halve the transmission rate. In this paper, we propose a new multipath congestion control scheme for high-quality multimedia streaming. The proposed scheme preserves high quality of video by adaptively adjusting the increasing parameter of subflows according to the network status. The proposed scheme also increases network efficiency by providing load balancing and stability, and by supporting fairness with single-flow congestion control schemes.