Title :
Supporting adaptive video applications in mobile environments
Author :
Davies, Nigel ; Finney, Joe ; Friday, Adrian ; Scott, Andrea
Author_Institution :
Lancaster Univ., UK
fDate :
6/1/1998 12:00:00 AM
Abstract :
The transmission of digital video over wireless networks is becoming a reality: it is now possible to construct working prototype systems which illustrate the benefits to be accrued from the integration of mobile computing and digital video. However, systems which deploy video in mobile environments must be able to adapt to changes in the quality of service of their underlying communications channel. The authors focus on the practical applications and implications of supporting adaptive video in mobile environments. In particular, we describe a testbed which supports multicast transmission of stored and live video sequences over both WaveLAN and GSM technologies. The testbed employs H.263 and MPEG encoding techniques and enables clients to freely roam between heterogeneous networks while maintaining video connectivity
Keywords :
adaptive systems; cellular radio; code standards; digital television; image sequences; interactive video; land mobile radio; radio networks; telecommunication standards; video coding; visual communication; wireless LAN; GSM; H.263 techniques; MPEG encoding; WaveLAN; adaptive video applications; communications channel; digital video; digital video transmission; heterogeneous networks; live video sequences; mobile computing; mobile environments; multicast transmission; prototype systems; quality of service; stored video sequences; testbed; video connectivity; video on demand system; Computer networks; Fluctuations; Intelligent networks; Mobile computing; Quality of service; Remote monitoring; Roaming; Testing; Wireless LAN; Wireless networks;
Journal_Title :
Communications Magazine, IEEE
