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dc.contributor.authorChoi, Baek-Young
dc.contributor.authorSong, Sejun
dc.contributor.authorWang, Yue
dc.contributor.authorPark, Eun Kyo
dc.date.issued2009-10
dc.description.abstractA holistic approach should be made for a wider adoption of a cross-layer approach. A cross-layer design on a wireless network assumed with a certain network condition, for instance, can have a limited usage in heterogeneous environments with diverse access network technologies and time varying network performance. The first step toward a cross-layer approach is an automatic detection of the underlying access network type, so that appropriate schemes can be applied without manual configurations. To address the issue, we investigate the characteristics of round-trip time (RTT) on wireless and wired networks. We conduct extensive experiments from diverse network environments and perform quantitative analyses on RTT variability. We show that RTT variability on a wireless network exhibits greatly larger mean, standard deviation, and min-to-high percentiles at least 10 ms bigger than those of wired networks due to the MAC layer retransmissions. We also find that the impact of packet size on wireless channel is particularly significant. Thus through a simple set of testing, one can accurately classify whether or not there has been a wireless network involved. We then propose effective adaptive cross-layer schemes for multimedia delivery over error-prone links. They include limiting the MAC layer retransmissions, controlling the application layer forward error correction (FEC) level, and selecting an optimal packet size. We conduct an analysis on the interplay of those adaptive parameters given a network condition. It enables us to find optimal cross-layer adaptive parameters when they are used concurrently.en
dc.description.sponsorshipIEEE Circuits & Systems Societyen
dc.identifier.citationBaek-Young Choi; Sejun Song; Yue Wang; Eun Kyo Park; , "Using RTT Variability for Adaptive Cross-Layer Approach to Multimedia Delivery in Heterogeneous Networks," Multimedia, IEEE Transactions on , vol.11, no.6, pp.1194-1203, Oct. 2009.en
dc.identifier.issn1520-9210
dc.identifier.urihttp://hdl.handle.net/10355/8178
dc.publisherIEEEen
dc.subjectAccess Protocolsen
dc.subjectRadio access networksen
dc.subjectTime-varying networksen
dc.subject.lcshMultimedia communicationsen
dc.subject.lcshInternet Protocol multimedia subsystemen
dc.subject.lcshWireless communication systemsen
dc.titleUsing RTT Variability for Adaptive Cross-Layer Approach to Multimedia Delivery in Heterogeneous Networksen
dc.typeArticleen


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