The Experts below are selected from a list of 23427 Experts worldwide ranked by ideXlab platform
Hwangjun Song - One of the best experts on this subject based on the ideXlab platform.
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an energy efficient multimedia Streaming transport protocol over heterogeneous wireless networks
IEEE Transactions on Vehicular Technology, 2016Co-Authors: Oh Chan Kwon, Hwangjun SongAbstract:This paper presents an energy-efficient multipath Streaming transport protocol to support a seamless high-quality video Streaming Service over heterogeneous wireless networks. The proposed protocol employs raptor codes to alleviate video quality degradation caused by wireless channel errors and the diverse characteristics of wireless networks. Furthermore, it is designed to reduce the energy consumption of a mobile device because more energy is generally consumed to activate multiple wireless networks and perform supplementary raptor decoding. For energy saving at the receiver side, the proposed protocol not only shapes a video stream but determines the raptor encoding parameters such as code rate, symbol size, and the number of source symbols as well, while considering the energy consumption of on-the-fly raptor decoding. The proposed protocol is fully implemented using C/C++ and Java on an Android-based smartphone and examined over real heterogeneous wireless networks. The proposed protocol can achieve good energy efficiency while providing a seamless high-quality video Streaming Service compared with existing protocols.
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mpmtp multipath multimedia transport protocol using systematic raptor codes over wireless networks
IEEE Transactions on Mobile Computing, 2015Co-Authors: Oh Chan Kwon, Yongseok Park, Hwangjun SongAbstract:This paper presents a multipath multimedia transport protocol (MPMTP), which exploits path diversity over heterogeneous wireless networks. The goal of MPMTP is to provide a seamless high-quality video Streaming Service by using multiple wireless networks simultaneously. In MPMTP, systematic Raptor codes are adopted to mitigate video quality degradation caused by wireless channel errors as well as to alleviate a head-of-line blocking problem in multipath environments, and their encoding parameters such as code rate, symbol size, and the number of source symbols are determined on the fly by considering the wireless channel state, Raptor encoding and decoding complexity, and receiver buffer occupancy. Furthermore, MPMTP performs packet scheduling considering not only wireless network conditions but also packet payload characteristics for smooth video playback. The proposed MPMTP is fully implemented in a Linux kernel and examined over real wireless network environments.
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An End-to-End Virtual Path Construction System for Stable Live Video Streaming over Heterogeneous Wireless Networks
IEEE Journal on Selected Areas in Communications, 2011Co-Authors: Sangchun Han, Hyunchul Joo, Dongju Lee, Hwangjun SongAbstract:In this paper, we propose an effective end-to-end virtual path construction system, which exploits path diversity over heterogeneous wireless networks. The goal of the proposed system is to provide a high quality live video Streaming Service over heterogeneous wireless networks. First, we propose a packetization-aware fountain code to integrate multiple physical paths efficiently and increase the fountain decoding probability over wireless packet switching networks. Second, we present a simple but effective physical path selection algorithm to maximize the effective video encoding rate while satisfying delay and fountain decoding failure rate constraints. The proposed system is fully implemented in software and examined over real WLAN and HSDPA networks.
Oh Chan Kwon - One of the best experts on this subject based on the ideXlab platform.
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an energy efficient multimedia Streaming transport protocol over heterogeneous wireless networks
IEEE Transactions on Vehicular Technology, 2016Co-Authors: Oh Chan Kwon, Hwangjun SongAbstract:This paper presents an energy-efficient multipath Streaming transport protocol to support a seamless high-quality video Streaming Service over heterogeneous wireless networks. The proposed protocol employs raptor codes to alleviate video quality degradation caused by wireless channel errors and the diverse characteristics of wireless networks. Furthermore, it is designed to reduce the energy consumption of a mobile device because more energy is generally consumed to activate multiple wireless networks and perform supplementary raptor decoding. For energy saving at the receiver side, the proposed protocol not only shapes a video stream but determines the raptor encoding parameters such as code rate, symbol size, and the number of source symbols as well, while considering the energy consumption of on-the-fly raptor decoding. The proposed protocol is fully implemented using C/C++ and Java on an Android-based smartphone and examined over real heterogeneous wireless networks. The proposed protocol can achieve good energy efficiency while providing a seamless high-quality video Streaming Service compared with existing protocols.
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mpmtp multipath multimedia transport protocol using systematic raptor codes over wireless networks
IEEE Transactions on Mobile Computing, 2015Co-Authors: Oh Chan Kwon, Yongseok Park, Hwangjun SongAbstract:This paper presents a multipath multimedia transport protocol (MPMTP), which exploits path diversity over heterogeneous wireless networks. The goal of MPMTP is to provide a seamless high-quality video Streaming Service by using multiple wireless networks simultaneously. In MPMTP, systematic Raptor codes are adopted to mitigate video quality degradation caused by wireless channel errors as well as to alleviate a head-of-line blocking problem in multipath environments, and their encoding parameters such as code rate, symbol size, and the number of source symbols are determined on the fly by considering the wireless channel state, Raptor encoding and decoding complexity, and receiver buffer occupancy. Furthermore, MPMTP performs packet scheduling considering not only wireless network conditions but also packet payload characteristics for smooth video playback. The proposed MPMTP is fully implemented in a Linux kernel and examined over real wireless network environments.
Kwangsue Chung - One of the best experts on this subject based on the ideXlab platform.
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congestion control scheme for multimedia Streaming Service over high bandwidth delay product networks
Advanced Information Networking and Applications, 2014Co-Authors: Sunghee Lee, Kwangsue ChungAbstract:As the Internet evolves to include wide-area high bandwidth network paths, it has become possible to provide high volume multimedia applications over the Internet. However, slow-start based congestion control schemes have several limitations to guarantee the quality of high volume multimedia applications over high bandwidth networks. Slow-start mechanism requires many RTTs until an appropriate transmission rate is reached. This time-consuming process disturbs the rapid increase in video quality. Another problem of previous congestion control mechanism is burst packet losses caused by overshooting of transmission rate. These burst packet losses degrade the quality of video. In this paper, we propose a congestion control scheme to improve the quality of high volume multimedia Streaming over the high bandwidth networks. The proposed scheme increases congestion window based on the enhanced cubic function and the bandwidth estimation scheme to support fast start of flows. Also, our scheme reduces packet losses by mitigating overshooting of transmission rate. Simulation results have shown that our proposal can achieve a fast start up and reduce packet losses compared to the previous congestion control scheme for high bandwidth delay product networks.
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adaptive rate control scheme for Streaming based content sharing Service
Ksii Transactions on Internet and Information Systems, 2013Co-Authors: Sunghee Lee, Kwangsue ChungAbstract:This paper presents an adaptive rate control scheme for Streaming-based content sharing Service. This scheme delivers multimedia contents from a user device to another device or seamlessly redirects Streaming Service across heterogeneous user devices. In the proposed scheme, a Streaming server adjusts video quality level according to the network and client status. Our scheme is different from other rate control schemes, because the video quality at the server is decided not only based on the available bandwidth, but also based on the device characteristics and bandwidth requirement at the access network. We also propose a bandwidth estimation method to achieve more equitable bandwidth allocations among Streaming flows competing for the same narrow link with different Round Trip Times (RTTs). Through the simulation, we prove that our scheme improves the network stability and the quality of Streaming Service by appropriately adjusting the quality of the video stream. The simulation results also demonstrate the ability of the proposed scheme in ensuring RTT-fairness while remaining throughput efficient.
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weighted bandwidth sharing scheme to guarantee the video quality in home networks
International Conference on Information Networking, 2013Co-Authors: Dooyeol Yoon, Sungchang Lee, Jinpyo Hong, Kwangsue ChungAbstract:To efficiently provide a video Streaming Service in home networks, a network node should support QoS (Quality of Service) for the Streaming videos. In order to guarantee QoS, it is necessary to allocate the high bandwidth for the video stream flow when multiple flows compete for the scarce bandwidth resource. In this paper, we propose a novel bandwidth sharing scheme, called W-BS (Weighed Bandwidth Sharing), for video Streaming Service in home networks. To provide network stability in a congested network, the W-BS scheme shares the bandwidth according to the target utilization of bottleneck link. It also adaptively applies weighting factor to Service traffics. Through the simulation results, we prove that the proposed scheme guarantees the quality of the video Streaming Service in home networks.
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enhanced tfrc to improve the quality of multimedia Streaming Service
International Conference on Information and Communication Technology Convergence, 2012Co-Authors: Sunghee Lee, Kwangsue ChungAbstract:TFRC (TCP-friendly Rate Control) is designed to mainly provide optimal Service for unicast applications such as multimedia Streaming in the best-effort Internet environment. TFRC smoothly changes transmission rate while competing fairly with TCP by using an equation on the modeling of TCP Reno to adjust the transmission rate. However, TFRC inherits RTT-unfairness problem of TCP Reno which severely affects the performance of the long-RTT flows. Another disadvantage inherited from TCP Reno is overshooting problem of slow-start mechanism. A large number of packet losses within a RTT are inevitable because of overshooting. These losses degrade the quality of Streaming video. In this paper, we suggest two enhancements of TFRC in order to increase the quality of multimedia Streaming Service. Firstly, we propose a bandwidth estimation method to achieve more equitable bandwidth allocations among Streaming flows which compete for the same narrow link with different RTTs. Secondly, we propose a new slow start mechanism to decrease burst packet losses caused by overshooting. The simulation results have shown that our proposal can achieve a better RTT-fairness and reduce burst packet losses of slow-start as compared to the original TFRC.
Sungtae Moon - One of the best experts on this subject based on the ideXlab platform.
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enhanced upnp qos architecture for network adaptive Streaming Service in home networks
IEEE Transactions on Consumer Electronics, 2007Co-Authors: Hyunyong Lee, Sungtae Moon, Jongwon KimAbstract:The existing versions of UPnP QoS architecture have several limitations associated with how they provide QoS-guaranteed Streaming Service over dynamically time-varying networks. In this paper, an enhanced UPnP QoS architecture is proposed to support network-adaptive media Streaming in home networks. The proposed Streaming scheme is verified by realizing a prototype implementation over an UPnP Streaming testbed.
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upnp based qosagent for qos guaranteed Streaming Service in home networks
Consumer Communications and Networking Conference, 2006Co-Authors: Sungtae MoonAbstract:As A/V (audio/video) Services over IP networks become popular, there has been much interest in using home networking technology to provide QoS (quality of Service)- guaranteed A/V Services. For QoS-guaranteed A/V Services, reservation or allocation schemes are usually used to control the demand of network bandwidth. However, these approaches have some limitations that discourage practical implementations. It requires that all applications participate in the reservation system. It can not manage actual network resource status, since it does not provide dynamic network resource monitoring scheme. To provide QoS-guaranteed A/V Services, it is necessary to know actual network resource status, although all applications are not in the reservation system. We propose a middleware module that can improve existing reservation-style approaches, namely "QoSAgent", based on standard home networking pro- tocol. Based on UPnP (universal plug and play) QoS Services, the QoSAgent monitors network resource status and adapts its Streaming Services to varying network status. From the VideoLAN-based implementation, we confirm that the proposed approach can be used for QoS-guaranteed Streaming Services in home networks. I. INTRODUCTION With widespread Internet technologies, and the increasing number of users owning networking devices at home, home networks are becoming popular. The home network has been driven by home automation. Most of the applications that have been delivered to users are for home automation (11). Those applications include security, lighting, heating, cooking, washing appliances, etc. However, most recently, the effort on the development of home networks has been driven by the emerging A/V (audio/video) technologies like HD (high def- inition) video and QoS (quality of Service) technologies (12). It appears to be a large demand in the home network area for the use of applications such as real-time communication with A/V appliances, multimedia album, and high-quality Streaming Service, all of which requiring QoS. Likewise, as A/V Services have become popular in the home networks, there has been much interest in using home net- working technology to provide QoS-guaranteed A/V Services. Basically, the demand for QoS-guaranteed A/V Services like contents transferring and real-time communication with A/V appliances may exceed the bandwidth or latency constraints of the home network or portions of the home network. Excess demand may cause delivery delay. Since delivery of some of digital media files are time sensitive, delivery delay leads to rendering errors and artifacts that are annoying to users. It has been proposed that reservation or allocation schemes be used to control the demand of network bandwidth (1), (13). Unfortunately, reservation schemes has some limitations. These approaches are based on the premise that the entire system of user, applications, and digital media files may be completely controlled. These approaches require all users and applications to accurately know the amount of network resources they will need priori. It requires that all applications participate in the reservation system so that accurate allocation and calculation can be performed. It, also, can not manage actual network resource status, when applications that are not in reservation system consume network resource. These limitations have discouraged practical implementations. Thus, based on standard home networking protocol, we propose middleware approach that can improve existing reservation-style approaches (especially UPnP QoS architec- ture v1.0) and try to provide the QoS-guaranteed A/V Services based on monitoring and adaptation. The proposed approach
Zhang Q Qian - One of the best experts on this subject based on the ideXlab platform.
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deploying p2p networks for large scale live video Streaming Service peer to peer multimedia Streaming
IEEE Communications Magazine, 2007Co-Authors: Tang Y Yun, J Luo G Jianguang, Zhang M Meng, S Yang Q Shiqiang, Zhang Q QianAbstract:Peer-to-peer (P2P) networks have been adopted for Internet live video-Streaming Service, and several practical systems have been deployed in past years due to the inherent scalability and ease of deployment. However, most of these systems are commercial and proprietary, and hence little research was done in the area of characterizing practical system performance properties. In this article, we mainly present our experience on a practical P2P-based live video- Streaming system called GridMedia, which was employed to broadcast live the Chinese Spring Festival Gala show over the Internet. Benefiting from two sets of flush-crowd traces with about 15,239 and 224,453 concurrent users in a 300 kb/s Streaming session in 2005 and 2006, we perform a trace study to understand the Service capacity, quality of Streaming Service, connection heterogeneity, user geographic distribution, and request and online duration characteristics. Our observations shed light on those systems and further improvements in the arena of large-scale live video-Streaming Service over the Internet.
