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  • 1. Al Khatib, I.
    et al.
    Maguire, G.Q.
    Ayani, R.
    Forsgren, Daniel
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Wireless LAN Access Points as Queuing Systems: Performance Analysis and Service Time2003In: Mobile Computing and Communications Review, ISSN 1559-1662, Vol. 7, no 1, p. 28-30Article in journal (Refereed)
    Abstract [en]

    Since the approval of the IEEE 802.11b by the IEEE in 1999, the demand for WLAN equipment and networks has been growing quickly. We present a queuing model of wireless LAN (WLAN) access points (APs) for IEEE 802.11b. We use experimentation to obtain the characteristic parameters of our analytic model. The model can be used to compare the performance of different WLAN APs as well as the QoS of different applications in the presence of an AP. We focus on the delay introduced by an AP. The major observations are that the delay to serve a packet going from the WLAN medium to the wired medium (on the uplink) is less than the delay to serve a packet, with identical payload, but travelling from the wired medium to the WLAN medium (on the downlink). A key result is an analytic solution showing that the average service time of a packet is a strictly increasing function of payload.

  • 2.
    Forsgren, Daniel
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Robust Scalable Video Multicast and Performance Issues in Wireless LANs2004Licentiate thesis, monograph (Other scientific)
    Abstract [en]

    The successful deployment of multimedia streaming services, over a multiservice IP-based heterogeneous infrastructure, requires resource-efficient, scalable and reliable network transport. This can be achieved using end-to-end methods, e.g. adaptive application-level source and channel coding. Network assistance can also be employed, e.g. multicast routing and Quality of Service (QoS) provisioning mechanisms. Multicast transport in particular presents many challenges with respect to scalability, reliability and congestion control. Furthermore, with an increasing use of bandwidth-constrained and unreliable access networks such as Wireless LAN (WLAN) networks, implementing adaptive schemes which can utilize the scarce network resources is important. In this thesis, topics in the area of adaptive rate, congestion and error control schemes for video streaming applications over heterogeneous networks are studied. The contributions evaluate the end-to-end video quality gain from using a network-driven approach, based on router priority dropping and temporal video scalability. Furthermore, the end-to-end video quality gain from using a receiverdriven layered video multicast scheme is studied, using a dynamic Forward Error Correction (FEC) based error control scheme to enhance transport robustness. The scheme is evaluated in a WLAN infrastructure network setting. Finally, a model-based measurement study of WLAN access point forwarding behavior is included.

  • 3.
    Forsgren, Daniel
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Jennehag, Ulf
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Österberg, Patrik
    Objective End-to-End QoS Gain from Packet Prioritization and Layering in MPEG-2 Streaming2002In: International Packetvideo workshop 2002, 2002Conference paper (Other academic)
    Abstract [en]

    Layered video coding as well as prioritized packet scheduling are two well-known methods that may improve the quality of service level in real-time applications with high bandwidth requirements, and are used over packet switched networks. However, it is often difficult to get an idea of, and to quantify, the actual gains that may be achievable, especially from an end-to-end perspective.In this paper, we present some experimental results from using temporally layered MPEG-2 video combined with basic per-layer IP packet prioritization. The goal has been to find out if a basic scheme is useful at all in combination with this particular source coding method, and if so, how much the objective video quality can be increased during bandwidth-constrained periods. The quality is measured in terms of PSNR and the results are compared to the case of equal packet priority. Also, different packet sizes as well as packet queuing disciplines are used. We conclude that using even a relatively simple temporal layering strategy in combination with packet prioritization can quite significantly improve the end-to-end quality of MPEG-2 video, especially in moderately bandwidth constrained situations. Furthermore, packet size and queuing discipline is found to have an impact.

  • 4.
    Österberg, Patrik
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Forsgren, Daniel
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Zhang, Tingting
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Receiver-controlled dynamic forward error correction for video streaming2003Report (Other academic)
    Abstract [en]

    The proportion of real-time traffic, being transported over IP networks, appears to be ever increasing. Real-time traffic may, for example, consist of video and audio data, which have real-time constraints in terms of metrics such as maximum delay, delay jitter and packet loss. Bounds on such metrics can be hard to satisfy by the network, hence there is an incentive to make multicast streaming of video more packet-loss resilient. Receiver-driven layered multicast has been proposed for dealing with band limitations, and environments with heterogeneous terminals. We have extended these ideas to handle packet loss, by adding receiver-driven forward error control (FEC). The aim of this paper is to further improve the performance, by optimizing the distribution of the error protection between the layers.

  • 5.
    Österberg, Patrik
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Forsgren, Daniel
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Zhang, Tingting
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Receiver-Controlled Joint Source/Channel Coding on the Application Level, for Video Streaming over WLANs2003In: The 57th IEEE Semiannual Vehicular Technology Conference, 2003. VTC 2003-Spring.: Vol. 3, 2003, p. 1558-1561Conference paper (Refereed)
    Abstract [en]

    The proportion of real-time traffic, being transported over internet protocol (IP) networks, appears to be ever increasing. Real-time traffic may, for example, be video and audio, which have real-time constraints such as maximum delay and delay jitter. Such requirements can be hard to satisfy in a wired infrastructure, and are even more so in a wireless network. Therefore there is a need to make transmission over wireless local area networks (WLANs) more reliable. The aim of this paper is to outline a proposal of such a scheme, which enables efficient transmission of MPEG-4 video over an IEEE 802.11b WLAN, and to experimentally verify its efficiency. Receiver-driven layered multicast has been proposed before, for dealing with band limitations and environments with heterogeneous terminals. We extend these ideas to handle packet loss, by adding receiver-driven unequal error protection (UEP). The proposal can be viewed as receiver-controlled joint source/channel (JSC) coding on the application level.

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