Search results for "Access time"

showing 3 items of 3 documents

Filecasting for streaming content delivery in IP datacast over DVB-H systems

2008

In this paper we investigate the potential gain that can be obtained in DVB-H by delivering streaming content as a succession of time-constrained flies using Application Layer - Forward Error Correction (AL-FEC) for improving the reception for mobile terminals. Compared to the conventional approach with link layer MPE-FEC, this technique allows to increase the robustness of the DVB-H transmission not only as a function of the capacity devoted for error repair (FEC overhead), but also as a function of the number of data bursts coded jointly ("file" or, source data block, size). The main drawback of this approach is an increase of the network latency proportional to the source block size, tha…

Computer sciencebusiness.industryRobustness (computer science)DVB-HDigital Video BroadcastingLink layerData_CODINGANDINFORMATIONTHEORYForward error correctionError detection and correctionbusinessLink marginAccess timeComputer network2008 IEEE International Symposium on Broadband Multimedia Systems and Broadcasting
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Application Layer FEC for Mobile TV Delivery in IP Datacast Over DVB-H Systems

2009

In this paper we investigate the potential gain that can be obtained in DVB-H using application layer forward error correction (AL-FEC) to perform a multi-burst protection of the transmission for improving the reception of streaming services for mobile terminals. Compared to the conventional approach with link layer multi protocol encapsulation FEC (MPE-FEC), this technique allows to increase the robustness of the DVB-H transmission not only as a function of the capacity devoted for error repair (FEC overhead), but also as a function of the number of bursts jointly encoded. The main drawback of this approach is an increase of the network latency, that can be translated into a larger service…

business.industryComputer scienceDVB-HMobile televisionReal-time computingData_CODINGANDINFORMATIONTHEORYApplication layerlaw.inventionlawInternet ProtocolDigital Video BroadcastingMedia TechnologyLink layerForward error correctionElectrical and Electronic EngineeringbusinessAccess timeComputer networkIEEE Transactions on Broadcasting
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Temporal Fairness Provisioning in Multi-Rate Contention-Based 802.11e WLANs

2005

The IEEE 802.11e extensions for QoS support in WLAN define the transmission opportunity (TXOP) concept, in order to limit the channel holding times of the contending stations in the presence of delay-sensitive traffic. We evaluate the use of TXOP for a different purpose: "temporal fairness" provisioning among stations employing different data rates. We show that the equalization of the channel access times allows each station to obtain its throughput basically (1) proportional to its transmission rate, and (2) independent of the transmitted frame length. This also improves the aggregate throughput of the overall WLAN. For a given TXOP limit, i.e., a granted channel access time, a station is…

business.industryComputer scienceQuality of serviceComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSReal-time computingFrame (networking)ComputingMilieux_PERSONALCOMPUTINGWireless local area networks (WLAN)ProvisioningThroughputThroughputIEEE 802.11e-2005Limit (mathematics)businessadaptation schemeAccess timeCommunication channelComputer networkSixth IEEE International Symposium on a World of Wireless Mobile and Multimedia Networks
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