Fengdan Wan

University of Victoria, Victoria, British Columbia, Canada

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Publications (6)2.85 Total impact

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    ABSTRACT: A heterogeneous wired and wireless network architecture is considered for home networks to support Internet Protocol TV (IPTV), voice, and data, the so-called triple-play services. To satisfy the quality of service (QoS) requirements for different traffic classes, class-based queueing (CBQ) is deployed at home gateways and routers. To estimate the network capacity and decide on an appropriate resource management scheme, we develop an analytical framework to quantify the maximum number of IPTV connections that can be supported with guaranteed QoS over wired and multi-hop wireless networks. We extend the fluid-flow model to capture both the burstiness of IPTV sources and the time-varying characteristics of multi-hop wireless paths. Heterogeneous traffic and CBQ are considered in the model. Simulation results over wired and multi-hop wireless paths are given which validate the analysis. The results presented provide important guidelines for the planning of future home networks for triple-play services. They also provide important insights into how to efficiently support heterogeneous traffic with stringent QoS requirements over wireless and wired networks.
    Computer Communications. 01/2010;
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    ABSTRACT: IPTV is considered to be the next killer application. A key, challenging issue is in-home IPTV distribution with affordable deployment cost and sufficient flexibility, scalability, and reliability. In this article, we first survey and compare the emerging wired and wireless communication technologies for broadband home networks, including transmission over power lines, phone lines, coaxial cables or Ethernet cables, and IEEE 802.1 In, ultra wideband and millimeter wave wireless technologies. Considering these promising candidates for future broadband home networks, we propose three wireless mesh network architectures. These enable consumers to enjoy anywhere, anytime IPTV services without rewiring their homes. We compare the cost, reliability, and scalability of the three architectures. We further study their admission regions for IPTV, that is, the number of IPTV connections that can be supported simultaneously with satisfactory QoS. Analytical and simulation results with H.264 HDTV sources over wired, single hop wireless, and multi-hop wireless paths are given. These results can provide important guidelines for future broadband home network design supporting IPTV services.
    IEEE Network 02/2008; · 2.85 Impact Factor
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    IEEE Network. 01/2008; 22:52-57.
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    Fengdan Wan, Lin Cai, T. Aaron Gulliver
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    ABSTRACT: To facilitate network performance analysis and simulations for IPTV traffic, a two-level Markovian traffic model is proposed in the paper. The model considers both spatial and temporal correlation in MPEG encoded video sequences, so it can mimic the highly variable data rate (VBR) behavior of IPTV sources. The model contains a Group of Pictures (GoP)- level Markov chain and a frame-level Markov chain, so it can capture both the inter-GoP and intra-GoP correlations. The proposed traffic model is simple to incorporate into network simulators, and can be used to obtain closed-form solutions of queue performance. Extensive simulations have been conducted to compare the network performance using the proposed model with the performance of a variety of real video traces. The results show that the accuracy of the proposed video source model is sufficient for the study of network performance. Therefore, it is an effective tool for performance evaluation of IPTV services via analysis and/or simulation.
    Proceedings of the Global Communications Conference, 2008. GLOBECOM 2008, New Orleans, LA, USA, 30 November - 4 December 2008; 01/2008
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    Fengdan Wan, Lin Cai, T. Aaron Gulliver
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    ABSTRACT: Telecommunication service providers are racing to deliver IPTV/video on demand (VoD), voice, and data, the so called triple-play services. IPTV traffic, supported by the UDP protocol, has highly variable data rates and stringent quality of services (QoS) requirements in terms of delay and loss. Data and VoD flows are normally supported by TCP, which has its own congestion control loop to adjust the sending rate, so the traffic load is also highly dynamic. If IPTV and TCP traffic is simply multiplexed, their performance is difficult to predict and the competition between them will jeopardize their QoS. To efficiently utilize network resources and provide satisfactory QoS for both traffic types, we propose multiplexing IPTV and TCP traffic with the protection of a class based queuing (CBQ) scheme. We also develop an analytical framework to model the multiplexed IPTV traffic and TCP traffic with CBQ. The analytical results can be used as a guide to determine the admission region of IPTV and the CBQ parameters. Simulation results are presented which validate the analytical results and demonstrate the effectiveness of the proposed solution. By multiplexing IPTV and TCP traffic appropriately, network resources can be more efficiently utilized, the QoS of IPTV can be maintained, and TCP flows can obtain higher throughputs.
    Proceedings of IEEE International Conference on Communications, ICC 2008, Beijing, China, 19-23 May 2008; 01/2008
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    ABSTRACT: A heterogeneous wired and wireless network architecture is proposed for in-home IPTV distribution. To identify the bottleneck in the home network and estimate the network capacity, we develop an analytical framework to quantify the maximum number of IPTV connections that can be supported with guaranteed QoS in the wired and multi-hop wireless networks, respectively. We extend the fluid flow model analysis to capture both the burstiness of IPTV sources and the time-varying characteristics of multi-hop wireless channels. Extensive NS-2 simulations with H.264 HDTV sources over wired and multi- hop wireless paths are given, which validate the analysis. The analytical and simulation results provide important guidelines for the planning of future home networks and IPTV systems.
    Proceedings of the Global Communications Conference, 2007. GLOBECOM '07, Washington, DC, USA, 26-30 November 2007; 01/2007