• Title/Summary/Keyword: Packet buffering

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A Study of Performance Analysis on Effective Multiple Buffering and Packetizing Method of Multimedia Data for User-Demand Oriented RTSP Based Transmissions Between the PoC Box and a Terminal (PoC Box 단말의 RTSP 운용을 위한 사용자 요구 중심의 효율적인 다중 수신 버퍼링 기법 및 패킷화 방법에 대한 성능 분석에 관한 연구)

  • Bang, Ji-Woong;Kim, Dae-Won
    • Journal of Korea Multimedia Society
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    • v.14 no.1
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    • pp.54-75
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    • 2011
  • PoC(Push-to-talk Over Cellular) is an integrated technology of group voice calls, video calls and internet based multimedia services. If a PoC user can not participate in the PoC session for various reasons such as an emergency situation, lack of battery capacity, then the user can use the PoC Box which has a similar functionality to the MM Box in the MMS(Multimedia Messaging Service). The RTSP(Real-Time Streaming Protocol) method is recommended to be used when there is a transmission session between the PoC box and a terminal. Since the existing VOD service uses a wired network, the packet size of RTSP-based VOD service is huge, however, the PoC service has wireless communication environments which have general characteristics to be used in RTSP method. Packet loss in a wired communication environments is relatively less than that in wireless communication environment, therefore, a buffering latency occurs in PoC service due to a play-out delay which means an asynchronous play of audio & video contents. Those problems make a user to be difficult to find the information they want when the media contents are played-out. In this paper, the following techniques and methods were proposed and their performance and superiority were verified through testing: cross-over dual reception buffering technique, advance partition multi-reception buffering technique, and on-demand multi-reception buffering technique, which are designed for effective picking up of information in media content being transmitted in short amount of time using RTSP when a user searches for media, as well as for reduction in playback delay; and same-priority packetization transmission method and priority-based packetization transmission method, which are media data packetization methods for transmission. From the simulation of functional evaluation, we could find that the proposed multiple receiving buffering and packetizing methods are superior, with respect to the media retrieval inclination, to the existing single receiving buffering method by 6-9 points from the viewpoint of effectiveness and excellence. Among them, especially, on-demand multiple receiving buffering technology with same-priority packetization transmission method is able to manage the media search inclination promptly to the requests of users by showing superiority of 3-24 points above compared to other combination methods. In addition, users could find the information they want much quickly since large amount of informations are received in a focused media retrieval period within a short time.

UDP Packet Transfers on Mobile Handoffs (무선 핸드오프 시 유디피 패킷의 전송)

  • Na Bokyun;Han Ikjoo;Oh Yong-Chul
    • Proceedings of the Korean Information Science Society Conference
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    • 2005.11a
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    • pp.271-273
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    • 2005
  • In wireless UDP data transfers, the handoff is one of the most breaking down things. To polycast multimedia data to several clients a sewer may connect clients by UDP networks. Mostly, video data must be compressed based on difference between before and next packets. Thus, the packet losses on the video stream may cause the recomposing of video data to be corrupt. This proposal provides simply retransmitting of lost packets according to a sequence and buffering packets in a given order.

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A History Retransmission Algorithm for Online Arcade Video Games

  • Kim Seong-Hoo;Park Kyoo-Seok
    • Journal of Korea Multimedia Society
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    • v.8 no.6
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    • pp.798-806
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    • 2005
  • In this paper, we suggest a game system that can support network modules for multi-platform based video games, and built a system that can convert from a single-user game to multi-user game. In this system, we bring in an initial delay buffering scheme on clients to handle any periods of latency occurring from the load fluctuation in a network, when a real-time game is played, and shows that stable play for a game is achieved as the result of the scheme. This paper also presents a retransmission algorithm based on the history of game commands to handle drawbacks of UDP mechanism. And, we evaluate the network delay and packet loss using the simulation tool NS2, and shows the case of 0.3 second buffer delay is the most suitable for recovery.

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A Scheduling Method for QoS Switching of Multicast Packet (Multicast 패킷의 QoS 스위칭을 위한 스케쥴링 방법)

  • 이형섭;김환우
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.26 no.11C
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    • pp.123-132
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    • 2001
  • This paper proposes a sound multicast packet-switching method which can less affect QoS(Quality of Service) degradation. The method includes a switch fabric with extra switching paths dedicated f()r 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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A Handoff Mechanism to Avoid Congestion in Wireless Cells (무선 셀에서의 혼잡 발생을 피하는 핸드오프 방안)

  • 변해선;이미정
    • Journal of KIISE:Information Networking
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    • v.30 no.5
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    • pp.595-603
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    • 2003
  • To provide mobile nodes with continuous communication services, it is important to reduce the packet losses during handoffs. The handoffs of mobile nodes cause packet losses and decrease of TCP throughput on account of a variety of factors. One of those is the congestion in the new cell. Due to the congestion, not only the node moving into the cell but also the already existing nodes that were successfully communicating in the cell suffer the performance degradation. In this paper we propose a new handoff mechanism called‘packet freeze control’, which avoids the congestion caused by handoffs by regulating the influx of traffic burst into the new cell. Packet freeze control is applicable to a wireless network domain in which FAs(Foreign Agents) are connected hierarchically and constitute a logical tree. It gradually increases the number of packets transferred to the new cell by buffering packets in the FAs on the packet delivery path over the wireless network domain. The simulation results show that the proposed mechanism not only reduces the packet losses but also enhances the TCP throughput of other mobile nodes in the cell.

A Scheme to Handle Out-of-Order Packets in Route Optimization for Proxy Mobile IPv6 (Proxy Mobile IPv6 에 대한 라우트 최적화에서 불규칙 패킷을 다루기 위한 기법)

  • Anh, Khuong;Yeoum, Sanggil;Kim, Dongsoo;Choo, Hyunseung
    • Proceedings of the Korea Information Processing Society Conference
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    • 2014.04a
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    • pp.190-191
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    • 2014
  • Out-of-Order Packet ($O^3P$) problem is an issue that significantly impacts to the QoS of service and network. Route optimization (RO) in PMIPv6 is proposed by P.Loureiro and M. Liebsch to reduce the load of LMAs and transmission delay. In RO scheme, at the time the optimal path is established, there exist two paths: optimal path and old path as non-optimal path for transmitting data between MN1 and MN2 that is the cause of $O^3P$ occurring. This paper proposes a scheme to prevent $O^3P$ problem by using packet buffering technique and a new mobility message, named End Traffic Marker (ETM) to mark the end of packet delivery through the old path.

A hierarchical Xcast++ mechanism for multicast services in mobile communication environment (이동 통신망 환경에서 멀티캐스트를 제공하기 위한 계층적 Xcast++ 기법)

  • Kim Tae-Soo;Lee Kwang-Hui
    • Journal of Internet Computing and Services
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    • v.6 no.3
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    • pp.55-70
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    • 2005
  • In order to provide mobile hosts with multicast service in mobile communication environment, we proposed a multicast mechanism named HXcast++ which is an extended version of the existing Xcast++ with hierarchical architecture, We assured that mobile hosts could get multicast service through an optimal path regardless of their location by making DR(Designated Router) join a group on behalf of the mobile hosts, In this present research we introduced hierarchical architecture in order to reduce the maintenance cost resulting from frequent handoff. We also proposed a GMA (Group Management Agent) based group management mechanism which enables the mobile hosts to join the group without waiting for a new IGMP Membership Query. A fast handoff method with L2 Mobile Trigger was, in this work, employed in order to reduce the amount of the packet loss which occurs as a result of the handoff, We also managed to curtail the packet loss caused by the latency of the group join by using a buffering and forward mechanism.

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LLHS: Low Latency Handoff Scheme based on Buffering for Mobile Networks (이동망에서 버퍼링에 기반한 핸드오프 지연감소기법)

  • Rho, Kyung-Taeg;Chung, Dong-Kun
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.8 no.5
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    • pp.105-111
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    • 2008
  • Mobility support for mobile networks will be important to minimize the packet overhead, to optimize routing, to reduce handoff latency, and to reduce the volume of handoff signals. Mobile IPv6 (MIPv6) and Hierarchical MIPv6 (HMIPv6) are one of mobility management protocols (MMPs) that provides network layer mobility over all access technologies. However, the communication quality of these candidates is severely degraded during handoffs. As another way to improve the handoff performance of a mobile network by conventional MMPs such as MIPv6 and HMIPv6, we propose a Low Latency Handoff Scheme (LLHS) combining Fast MIPv6 (FMIPv6) with HMIPv6 extension with buffering function, in which Mobility Anchor Points (MAPs) buffer packets destined to the Mobile Routers (MRs) or MNs within a mobile network during handoffs. The simulation results show that the proposed scheme reduces transmission delay and packet loss in UDP communication.

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Slective Buffering Macro Handover Which Applies The F-SNOOP in Hierarchical structure (계층 구조에서 F-SNOOP을 적용한 선택적 버퍼링 매크로 핸드오버)

  • Ahn Chi-Hyun;Kim Dong-Hyun;Kim Hyoung-Chul;Ryou Hwang-Bin;Lee Dae-Young;Jun Kye-Suk
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.31 no.5B
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    • pp.413-420
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    • 2006
  • HMIPv6 is designed to reduce the signaling load to external network and improve handover speed of MN by including Mobility Anchor Point(MAP) in local handover. However in this case of macro handover, it's just used pervious MIPv6 handover algorithm. So, it occurs packet loss and transmission delay problem. In this paper, we propose the mechanism applying the HMIPv6 for Fast Handover to choose suitable to the condition buffering handover. The condition for the selection is result distance measurement between MN and CN, between MN and NAR. Furthermore, using F-SNOOP protocol, it is possible to improve wireless network performance. Wireless network has high Bit Error Rate(BER) characteristic because of path loss, fading, noise and interference. TCP regards such errors as congestion and starts congestion control. This congestion control makes packet transmission rate low. However, F-SNOOP improves TCP performance based on SNOOP and Freeze TCP that use Zero Window Advertisement(ZWA) message when handoff occurs in wireless network.

An Enhanced Fast Handover Scheme for Real-Time Traffic in IPv6 Based WiBro Network (IPv6기반 와이브로 시스템에서 실시간 트래픽을 위한 개선된 빠른 핸드오버 방안)

  • Jeong, Seok-Jong;Lee, Sung-Kuen;Park, Jin-Woo
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.33 no.4A
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    • pp.377-386
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    • 2008
  • In this paper, a new handover management scheme has been proposed to reduce handover latency and to support fast handover without packet losses, so that it may be applicable to the wireless mobile Internet system such as IPv6-based WiBro system. To minimize the handover latency in processing of movement detection, we propose the handover management scheme which simplifies the handover message exchanging procedure between mobile subscriber station (MSS) and network by integrating layer 2 and layer 3 handovers efficiently based on the layer2 information. To reduce the processing delay from new care-of-address (NCoA) configuration during handover, we propose that NCoA is created, distributed and managed by new access control router (NACR). In addition, in order to minimize the packet transmission delay and eliminate the packet losses, the proposed scheme employs a crossover router (CR) which is upper network located over PACR and NACR and employs the packet buffering for MSS. The simulation study shows that the proposed scheme achieves loss-free packet delivery and low latency in the environment of narrow overlapped cell area or high velocity of the MSS, comparing the performance with the conventional schemes.