Integrated Wireless Access for Videoconference From MPEG-4 and H.263 Video Coders With Voice, E-mail, and Web Traffic

Bandwidth Allocation for Integrated MPEG-4 Video, WAP and MP3 Traffic over Next Generation Wireless Cellular Networks

“…A terminal with a reservation transmits freely within its reserved slot. In contrast to [11], where no contention was assumed among video terminals (they were considered to "live" permanently in the system), in this work we propose the idea that video and data (WAP, MP3) terminals can share the request slots (WAP terminals enter contention after the end of the video contention period, followed by MP3 terminals; the reason for the higher priority of WAP terminals is that users are expected to be more tolerant to MP3 download delays than to WAP access delays). The reason we require video terminals to contend in order to reserve information slots is that in this work we are dealing with high quality stored video content which, in contrast to videoconference streams, generates highly bursty information.…”

“…Each request slot is subdivided into two minislots and each mini-slot accommodates exactly one, fixed length, request packet. By using more than one minislot per request slot, a more efficient usage of the available request bandwidth is possible, as explained in [11]. In that work, we studied the integration of videoconference streams (not actual movies as in this work, as MTs were considered simple devices which could not act as cache memories) with voice and email data traffic (instead of the much burstier MP3 and WAP traffic, as in this study) over a lower capacity wireless channel without errors (a burst-error model is adopted in this work) and with a different frame structure and BS scheduling policy.…”

“…The reason we require video terminals to contend in order to reserve information slots is that in this work we are dealing with high quality stored video content which, in contrast to videoconference streams, generates highly bursty information. Video requirements change frequently over time and it is impossible to ensure that their demands will reach the BS successfully if we use techniques similar to the ones described in [11]. The two-cell stack reservation random access algorithm [12] is used to resolve the collisions, among video request packets.…”

“…The channel rate is 20 Mbps (from [14]), and the frame duration equal to 12 ms (from [9,11]). The 12 ms of frame duration accommodate 566 slots (556 information slots plus 10 request slots).…”

Pervasive Video Surveillance Systems Over TCP/IP Networks

“…Every video camera usually requires between 1 and 10 Mb/s for a high quality stream with a frame rate of 25 frames per second and an image resolution of 640×480 pixels (Koutsakis et al, 2005). Common enterprise and municipal networks are not designed to support tens or even hundreds of streams because the majority of currently installed Local Area Networks (LANs) only provides a maximum (theoretical) bandwidth of 10/100 Mb/s.…”