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检索条件"任意字段=Conference on Multimedia Computing and Networking"

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A link adaptation strategy for QoS support in IEEE 802.11 e-based WLANs

A link adaptation strategy for QoS support in IEEE 802.11 e-...

引用

IEEE Wireless Communications and networking conference

作者： Bandinelli, M Chiti, F Fantacci, R Tarchi, D Vannuccini, G Univ Florence Dept Elect & Telecommun I-50139 Florence Italy

ISBN: (纸本)0780389662

Wireless Local Area Networks represent one of the most interesting technological improvement in the last period. In a couple of years, a lot of people use WLAN commonly just to connect to the internet or for e-mail downloading. Besides, the WLANs do not offer at the moment a satisfactory QoS support for multimedia traffic. The aims of the IEEE 802.11e standard is to develop some schemes for supporting multimedia traffic in an in-home environment. On the other hand, in the last years the Link Adaptation has gained a lot of attention due to its improvement to the channel occupancy and capacity optimization. In this paper a Link Adaptation algorithm suitable for using in a WLAN, based on the IEEE 802.11e draft, with QoS support is proposed.

关键词： quality of service IEEE standards wireless LAN indoor radio channel capacity optimisation multimedia communication mobile computing access protocols telecommunication traffic link adaptation QoS support MAC protocol WLAN in-home environment channel occupancy capacity optimization wireless local area networks Internet e-mail downloading multimedia traffic IEEE 802.11e standard wireless local area network (WLAN) channel occupancy Quality of service indoor radio telecommunication traffic Mobile computing Channel capacity Internets IEEE Standards

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Bandwidth reduction for video-on-demand broadcasting using secondary content insertion

Bandwidth reduction for video-on-demand broadcasting using s...

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conference on multimedia computing and networking 2005

作者： Golynski, A López-Ortiz, A Poirier, G Quimper, CG Univ Waterloo Waterloo ON N2L 3G1 Canada

ISBN: (纸本)0819456535

An optimal broadcasting scheme under the presence of secondary content (i.e. advertisements) is proposed. The proposed scheme works both for movies encoded in a Constant Bit Rate (CBR) or a Variable Bit Rate (VBR) format. It is shown experimentally that secondary content in movies can make Video-on-Demand (VoD) broadcasting systems more efficient. An efficient algorithm is given to compute the optimal broadcasting schedule with secondary content, which in particular significantly improves over the best previously known algorithm for computing the optimal broadcasting schedule without secondary content.

关键词： Computer programming Video Algorithms Rutherfordium Electronic imaging multimedia Televisions Video coding

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A location-aware, service-based audio system

A location-aware, service-based audio system

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2nd IEEE Consumer Communications and networking conference

作者： Kirk, R Newmarch, J Monash Univ Sch Network Comp Melbourne Vic 3004 Australia

ISBN: (纸本)0780387848

With the development of computer-based location tracking systems and sensor systems a large amount of contextual information is available to the application developer. Information such as the location and motion paths of users and physical objects, and the ambient noise and temperature of the surrounding environment can be used to tailor a users experience with an application, to best suit their requirements. This paper introduces a location-aware audio streaming application that utilizes a networked multimedia architecture. This architecture facilitates the advertisement, discovery and connectivity of audio services. The streaming application uses both the user's current location, and the location of surrounding active loudspeakers to determine the best output device to use.

关键词： home networks multimedia distribution protocols network architecture session user and device mobility middleware pervasive computing multimedia technologies interoperability location-based services

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A reconfigurable, on-the-fly, resource-aware, streaming pipeline scheduler

A reconfigurable, on-the-fly, resource-aware, streaming pipe...

引用

conference on multimedia computing and networking 2005

作者： Bradshaw, MK Kurose, J Page, LJ Shenoy, P Towsley, D Univ Massachusetts Dept Comp Sci Amherst MA 01003 USA

ISBN: (纸本)0819456535

multimedia systems use stream modules to perform operations on the streams that pass through them. To create services, programmers hand-code modules together to form a pipeline. While some advances have been made in automating this process, none yet exist that create pipelines that are fully aware of the system's resources. In this paper, we present the design and evaluation of the Graph Manager (GM), a pipeline scheduler that determines, on-the-fly, the best way to satisfy requests using stream modules and reusing existing streams in the system.

关键词： multimedia computing systems System integration Computer science Dynamical systems Electronic imaging Imaging systems Picosecond phenomena Rapid manufacturing

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Improving the multimedia traffic performance over wireless LAN

Improving the multimedia traffic performance over wireless L...

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2005 International conference on Wireless Communications, networking and Mobile computing, WCNM 2005

作者： Wang, Jian-Ming Zhan, Shi Xian Zhao, Xu Dong Department of Computer Science and Technology Tsinghua University Beijing 100084 China

ISBN: (纸本)078039335X

In order to grapple with the continuously increasing demand on the multimedia traffic over high speed wireless LAN, we need a QoS-oriented MAC for wireless multimedia system. In this thesis, we will propose a efficient centralized scheduled access MAC approach in IEEE 802.11 to satisfy multimedia traffic. There are two main algorithms to achieve the goal, queue management algorithm for downlink and uplink to satisfy video traffic's high bandwidth requirement, polling list management method enhance the efficiency of the polling scheme for transmitting voice traffic. The result shows that the centralized scheduled access MAC approach we propose has excellent efficient and compelling performance. © 2005 IEEE.

关键词： Local area networks

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Automated QoS support for multimedia disk access

Automated QoS support for multimedia disk access

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conference on multimedia computing and networking 2005

作者： Wu, JC Banachowski, S Brandt, SA Univ Calif Santa Cruz Dept Comp Sci Santa Cruz CA 95064 USA

ISBN: (纸本)0819456535

This paper describes the AutoQoS mechanism, which improves the timeliness of disk accesses for multimedia applications without requiring any explicit information about their constraints. multimedia applications typically have periodic time constraints, meaning that they must complete data processing at periodic intervals in order to function correctly. This requirement extends to the disk system, because the application must access data on time in order to meet deadlines. By using Quality of Service algorithms for disk services, an application may receive enough bandwidth and isolation from other disk accesses to read data on time. Nevertheless, past approaches are restrictive because they require that disk bandwidth or deadlines be known and specified in advance. Our system infers from I/O behavior the bandwidth requirement of multimedia streams, and automatically adjusts allocations in order to provide Quality of Service without knowing the constraints or requiring intervention from the application.

关键词： storage QoS soft real-time and multimedia systems

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Dagster: Contributor-aware end-host multicast for media streaming in heterogeneous environment

Dagster: Contributor-aware end-host multicast for media stre...

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conference on multimedia computing and networking 2005

作者： Ooi, WT Natl Univ Singapore Dept Comp Sci Singapore 117548 Singapore

ISBN: (纸本)0819456535

We present Dagster, an end-host multicast scheme for delivering multimedia streams. Unlike previous schemes, Dagster does not constrain the amount of bandwidth a node must donate. Instead, it relies on a novel incentive scheme to encourage nodes to contribute more bandwidth to improve the total capacity of the system. The key idea behind the incentive is that Dagster allows a node with more donated bandwidth to preempt another node in the system. Dagster also allows a host to receive from multiple parents at the same time, thus is more resilient to node failures. Our simulation results show that Dagster's design leads to low rejection rate, high resilience to failure and smaller diameter. Furthermore, nodes that donate more bandwidth have lower rejection rate and are positioned fewer overlay hops away from the source, providing incentives for nodes to increase their contribution.

关键词： Receivers Video multimedia Computer programming Electronic support measures Computer simulations Computer science computing systems Electronic imaging Internet

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Exploiting content-based networking for fine granularity multi-receiver video streaming

Exploiting content-based networking for fine granularity mul...

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conference on multimedia computing and networking 2005

作者： Eide, VSW Eliassen, F Michaelsen, JA Simula Res Lab N-1325 Lysaker Norway

ISBN: (纸本)0819456535

Efficient delivery of video data over computer networks has been studied extensively for decades. Still, multi-receiver video delivery represents a challenge. The challenge is complicated by heterogeneity in network availability, end node capabilities, and receiver preferences. This paper demonstrates that content-based networking is a promising technology for efficient multi-receiver video streaming. The contribution of this work is the bridging of content-based networking with techniques from the fields of video compression and streaming. In the presented approach, each video receiver is provided with fine grained selectivity along different video quality dimensions, such as region of interest, signal to noise ratio, colors, and temporal resolution. Efficient delivery, in terms of network utilization and end node processing requirements, is maintained. A prototype is implemented in the Java programming language and the software is available as open source. Experimental results are presented which demonstrate the feasibility of our approach.

关键词： content-based networking distributed content-based publish subscribe systems fine granularity video streaming scalable video coding layered video multi-receiver video streaming

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A fair admission control scheme for multimedia wireless network

A fair admission control scheme for multimedia wireless netw...

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International conference on Wireless Communications, networking and Mobile computing

作者： Xu, S Xu, BG S China Univ Technol Coll Automat Sci & Engn Guangzhou Peoples R China

ISBN: (纸本)078039335X

CAC (Call Admission Control) scheme plays an important role in the QoS guarantee of wireless multimedia network. Lots of CAC schemes aim to satisfy QoS requirement and upgrade network utilization, but they ignore the fairness principle in network Directly and simply using these schemes, it will appear the phenomenon of unbalance that the narrow band calls block the broad band calls. The common method used to resolve fair problem is resource reservation method, but it will decrease the network utilization. So, this paper proposes a novel fair Call Admission Control scheme. Differing from resource reservation method, the new scheme introduces call hold control method to overcome unfair problem between narrow band calls and broad band calls. Numerical results show that the new scheme effectively improves network utilization and decreases CBP (Call Blocking Probability) especially when the network carries heavy traffic load. Simulation results ago show that the average waiting time of users is much less than their waiting time thresholds and users could receive the service in a short waiting time.

关键词： fairness principle Call Admission Control (CAC) call hold control

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TCP-RC: A receiver-centered TCP protocol for delay-sensitive applications

TCP-RC: A receiver-centered TCP protocol for delay-sensitive...

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conference on multimedia computing and networking 2005

作者： McCreary, D Li, K Watterson, SA Lowenthal, DK Univ Georgia Dept Comp Sci Athens GA 30602 USA

ISBN: (纸本)0819456535

TCP is the de-facto standard transport-layer protocol in the Internet. However, TCP is generally considered to be inappropriate for delay-sensitive applications such as multimedia. This paper proposes a novel receiver-centered TCP (TCP-RC), which is a TCP modification at the receiver that is intended for delay-sensitive applications. The basic principle behind TCP-RC is that it achieves low latency at the expense of reliability. In particular, TCP-RC forges lost packets, passing them on to an enabled application. This allows low-latency transmission for a class of applications that do not demand full reliability. Results obtained from emulated experiments show that over a range of loss rates and round-trip times, TCP-RC has a significantly smaller average- and worst-case per-packet delay than regular TCP.

关键词： Receivers Reliability multimedia Internet Signal attenuation Computer science Electronic imaging Lithium Standards development

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