Adaptation techniques for ubiquitous Internet multimedia

Margaritidis, M; Polyzos, GC

dc.contributor.author	Margaritidis, M	en
dc.contributor.author	Polyzos, GC	en
dc.date.accessioned	2014-03-01T11:44:28Z
dc.date.available	2014-03-01T11:44:28Z
dc.date.issued	2001	en
dc.identifier.issn	15308669	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/36963
dc.subject	Handoffs	en
dc.subject	Media adaptation	en
dc.subject	Mobile communications	en
dc.subject	Proxy filtering	en
dc.subject	Quality-of-Service	en
dc.subject	Ubiquitous access	en
dc.subject	Utility functions	en
dc.subject	Wireless networks	en
dc.title	Adaptation techniques for ubiquitous Internet multimedia	en
heal.type	other	en
heal.identifier.primary	10.1002/wcm.10	en
heal.identifier.secondary	http://dx.doi.org/10.1002/wcm.10	en
heal.publicationDate	2001	en
heal.abstract	We identify the importance of adaptation for the ubiquitous access to Internet multimedia content. The variety of media types combined with the diversity of Internet connection characteristics raises momentous challenges to the achievement of this goal. With adaptation, the characteristics of various media can be adjusted to better match those of the network path and the end device. As a result, adaptive streams enjoy superior robustness and provide substantially better presentation quality than traditional, non-adaptive ones, especially in variable, capacity-limited environments. We examine several important factors that influence the design and optimization of the adaptation architecture. First, the location of the adaptation mechanism on the end-to-end path must be chosen. Second, the adaptation policy, i.e., the agility in adapting to variations in network path performance, must be specified. Third, the adaptation mechanism needs to be aware of the value of the perceptual quality that the different representations of each medium and the necessary resources to sustain it. Finally, we emphasize the role of supporting mechanisms in enhancing the adaptation process, namely, prioritization, admission control and hand-off notifications. Based on the aforementioned criteria, we classify existing research approaches and present some of them as case studies. We also describe current commercial solutions and, finally, we discuss future trends in application adaptation in conjunction with recent developments towards wireless access to the Internet. Copyright © 2001 John Wiley & Sons, Ltd.	en
heal.journalName	Wireless Communications and Mobile Computing	en
dc.identifier.doi	10.1002/wcm.10	en
dc.identifier.volume	1	en
dc.identifier.issue	2	en
dc.identifier.spage	141	en
dc.identifier.epage	163	en