The Experts below are selected from a list of 8766 Experts worldwide ranked by ideXlab platform
Athina Markopoulou - One of the best experts on this subject based on the ideXlab platform.
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Video-aware opportunistic network coding over wireless networks
IEEE Journal on Selected Areas in Communications, 2009Co-Authors: Hulya Seferoglu, Athina MarkopoulouAbstract:In this paper, we study video streaming over wireless networks with network coding capabilities. We build upon recent work, which demonstrated that network coding can increase throughput over a Broadcast Medium, by mixing packets from different flows into a single packet, thus increasing the information content per transmission. Our key insight is that, when the transmitted flows are video streams, network codes should be selected so as to maximize not only the network throughput but also the video quality. We propose video-aware opportunistic network coding schemes that take into account both the decodability of network codes by several receivers and the importance and deadlines of video packets. Simulation results show that our schemes significantly improve both video quality and throughput. This work is a first step towards content-aware network coding.
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Opportunistic Network Coding for Video Streaming over Wireless
arXiv: Networking and Internet Architecture, 2007Co-Authors: Hulya Seferoglu, Athina MarkopoulouAbstract:In this paper, we study video streaming over wireless networks with network coding capabilities. We build upon recent work, which demonstrated that network coding can increase throughput over a Broadcast Medium, by mixing packets from different flows into a single packet, thus increasing the information content per transmission. Our key insight is that, when the transmitted flows are video streams, network codes should be selected so as to maximize not only the network throughput but also the video quality. We propose video-aware opportunistic network coding schemes that take into account both (i) the decodability of network codes by several receivers and (ii) the importance and deadlines of video packets. Simulation results show that our schemes significantly improve both video quality and throughput.
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Opportunistic network coding for video streaming over wireless
Packet Video 2007, 2007Co-Authors: Hulya Seferoglu, Athina MarkopoulouAbstract:In this paper, we study video streaming over wireless networks with network coding capabilities. We build upon recent work, which demonstrated that network coding can increase throughput over a Broadcast Medium, by mixing packets from different flows into a single packet, thus increasing the information content per transmission. Our key insight is that, when the transmitted flows are video streams, network codes should be selected so as to maximize not only the network throughput but also the video quality. We propose video-aware opportunistic network coding schemes that take into account both aspects, namely (i) the decodability of network codes by several receivers and (ii) the distortion values and playout deadlines of video packets. Simulation results show that our schemes significantly improve both video quality and throughput.
Ben Liang - One of the best experts on this subject based on the ideXlab platform.
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INFOCOM - SlideOR: Online Opportunistic Network Coding in Wireless Mesh Networks
2010 Proceedings IEEE INFOCOM, 2010Co-Authors: Yunfeng Lin, Ben LiangAbstract:Opportunistic routing significantly increases unicast throughput in wireless mesh networks by effectively utilizing the wireless Broadcast Medium. With network coding, opportunistic routing can be implemented in a simple and practical way without resorting to a complicated scheduling protocol. Traditionally, due to the constraints of computational complexity, a protocol utilizing network coding needs to partition the data into multiple segments and encode only packets in the same segment. However, it is extremely challenging to decide the optimal time to move to the transmissions of the next segment, and existing designs all resort to different heuristic ideas that might harm network throughput. To address this problem, we propose \emph{SlideOR}, a new protocol to encode source packets in overlapping sliding windows such that coded packets from one window position may be useful towards decoding the source packets inside another window position. Through extensive simulations, we show that \emph{SlideOR} outperforms the existing solutions and is amenable to much simpler implementation than solutions with complicated scheduling among multiple segments.
Mario Gerla - One of the best experts on this subject based on the ideXlab platform.
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Congestion control multicast in wireless ad hoc networks
Computer Communications, 2003Co-Authors: K. Tang, Mario GerlaAbstract:In this paper, the interaction of the Medium Access Control (MAC) and routing layer is used to address the congestion control multicast routing problem in wireless ad hoc networks. We first introduce the Broadcast Medium Window (BMW) MAC protocol, which provides robust delivery to Broadcast packets at the MAC layer. In doing so, we show that although BMW is able to provide high reliability under low to Medium network load, reliability dramatically degrades under high network load. We then extend the wireless On-Demand Multicast Routing Protocol (ODMRP) to facilitate congestion control in ad hoc networks using BMW to combat the poor performance under highly congested network conditions. Through simulation, we show that ODMRP with congestion control adapts well to multicast sources that are aggressive in data transmissions.
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reliable on demand multicast routing with congestion control in wireless ad hoc networks
ITCom 2001: International Symposium on the Convergence of IT and Communications, 2001Co-Authors: K. Tang, Mario GerlaAbstract:In this paper, we address the congestion control multicast routing problem in wireless ad hoc networks through the Medium access control (MAC) layer. We first introduce the Broadcast Medium Window (BMW) MAC protocol, which provides reliable delivery to Broadcast packets at the MAC layer. We then extend the wireless On-Demand Multicast Routing Protocol (ODMRP) to facilitate congestion control in ad hoc networks using BMW. Through simulation, we show that ODMRP with congestion control adapts well to multicast sources that are aggressive in data transmissions.
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INFOCOM - Rooted routing in linear lightwave networks
[Proceedings] IEEE INFOCOM '92: The Conference on Computer Communications, 1992Co-Authors: Milan Kovačevic, Mario GerlaAbstract:The authors propose a new scheme for optical signal routing within linear lightwave network (LLN) subnets. They study the synchronization problem that exists in these subnets which prevents efficient implementation of time division multiple access schemes for sharing a common Broadcast Medium. A solution for this problem is proposed, based on a new optical agent signal routing scheme, called rooted routing. The impact of the rooted routing on power losses is analyzed, and an approach for optimizing the power losses in LLNs with rooted routing is presented. It is shown that when the link and excess losses are small, the optimal power budget is close to that when the original, shortest path routing scheme is used. It is also shown that the power budget in LLNs with rooted routing can be significantly improved using a single optical amplifier. >
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Efficient multiaccess scheme for linear lightwave networks
Advanced Fiber Communications Technologies, 1991Co-Authors: Milan Kovačevic, Mario GerlaAbstract:In this paper we study the synchronization problem that exists in the linear lightwave network (LLN), a recently proposed fiber-optic architecture. The currently proposed solution prevents efficient implementation of time division multiple access (TDMA) schemes for sharing the common Broadcast Medium. The problem is typical of passive optical networks with a tree physical topology. In this paper we propose to overcome the synchronization problem in LLN by properly selecting the routing of the optical signals. The proposed scheme provides efficient utilization of the multiaccess channel with relatively low synchronization complexity.
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A guide to data communications: high-speed local-area networks
IEEE Spectrum, 1991Co-Authors: Mario Gerla, J.a.r. BannisterAbstract:Local area network (LAN) classifications based on speed are defined. The use of optical fiber, the fiber distributed data interface (FDDI) multitoken protocol, linear buses, and the dual queue distributed bus (DQDB) is examined. LAN limits are discussed. Supercomputer LANs and ultra-gigabit networks are considered. The so-called mass of glass, a wavelength-division-multiplexed architecture consisting of a passive optical Broadcast Medium, is discussed. Future issues and trends are indicated.
Hulya Seferoglu - One of the best experts on this subject based on the ideXlab platform.
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Video-aware opportunistic network coding over wireless networks
IEEE Journal on Selected Areas in Communications, 2009Co-Authors: Hulya Seferoglu, Athina MarkopoulouAbstract:In this paper, we study video streaming over wireless networks with network coding capabilities. We build upon recent work, which demonstrated that network coding can increase throughput over a Broadcast Medium, by mixing packets from different flows into a single packet, thus increasing the information content per transmission. Our key insight is that, when the transmitted flows are video streams, network codes should be selected so as to maximize not only the network throughput but also the video quality. We propose video-aware opportunistic network coding schemes that take into account both the decodability of network codes by several receivers and the importance and deadlines of video packets. Simulation results show that our schemes significantly improve both video quality and throughput. This work is a first step towards content-aware network coding.
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Opportunistic Network Coding for Video Streaming over Wireless
arXiv: Networking and Internet Architecture, 2007Co-Authors: Hulya Seferoglu, Athina MarkopoulouAbstract:In this paper, we study video streaming over wireless networks with network coding capabilities. We build upon recent work, which demonstrated that network coding can increase throughput over a Broadcast Medium, by mixing packets from different flows into a single packet, thus increasing the information content per transmission. Our key insight is that, when the transmitted flows are video streams, network codes should be selected so as to maximize not only the network throughput but also the video quality. We propose video-aware opportunistic network coding schemes that take into account both (i) the decodability of network codes by several receivers and (ii) the importance and deadlines of video packets. Simulation results show that our schemes significantly improve both video quality and throughput.
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Opportunistic network coding for video streaming over wireless
Packet Video 2007, 2007Co-Authors: Hulya Seferoglu, Athina MarkopoulouAbstract:In this paper, we study video streaming over wireless networks with network coding capabilities. We build upon recent work, which demonstrated that network coding can increase throughput over a Broadcast Medium, by mixing packets from different flows into a single packet, thus increasing the information content per transmission. Our key insight is that, when the transmitted flows are video streams, network codes should be selected so as to maximize not only the network throughput but also the video quality. We propose video-aware opportunistic network coding schemes that take into account both aspects, namely (i) the decodability of network codes by several receivers and (ii) the distortion values and playout deadlines of video packets. Simulation results show that our schemes significantly improve both video quality and throughput.
Sang-ha Kim - One of the best experts on this subject based on the ideXlab platform.
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A Dynamic Single-Hop Clustering Mechanism Adapted to Overlay Multicast in Mobile Ad hoc Networks
2006 Asia-Pacific Conference on Communications, 2006Co-Authors: Bongsoo Kim, Younghwan Choi, Kwansoo Jung, Hochoong Cho, Sang-ha KimAbstract:Overlay multicast in mobile ad hoc networks (MANETs) with densely placed member nodes can cause inefficient packet transmission. It is because unicast paths are used in overlay multicast while, in MANETs, Broadcast Medium is used. Even though the nodes can reach each other within single hop, overlay multicasting creates unicast paths so that in such a case overlay multicast could be very inefficient. In this paper, we propose Dynamic Single-Hop Broadcast Cluster (SHBC) to solve the problem of overlay multicast. SHBC is a clustering mechanism adapted to overlay multicast in MANETs. SHBC is based on LBC (Local Broadcast Cluster) proposed in Efficient End System Multicast for Mobile Ad Hoc Networks[4] but only constructs clusters in the highly dense areas. Using location information of cluster leaders, frequency of cluster reconstruction in SHBC is reduced around 10% in comparison with LBC.
