A bandwidth assignment algorithm on a satellite channel for VBR traffic

✍ Scribed by Celandroni, Nedo ;Conti, Marco ;Ferro, Erina ;Gregori, Enrico ;Potortì, Francesco

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 132 KB
• Volume: 15
• Category: Article
• ISSN: 0737-2884
• DOI: 10.1002/(sici)1099-1247(199711/12)15:6<237::aid-sat584>3.0.co;2-8

✦ Synopsis

Variable bit rate (VBR) video is currently by far the most interesting and challenging real-time application. A VBR encoder attempts to keep the quality of video output constant and at the same time reduces bandwidth requirements, since only a minimum amount of information has to be transferred. On the other hand, as VBR video traffic is both highly variable and delay-sensitive, high-speed networks (e.g. ATM) are generally implemented by assigning peak rate bandwidths to VBR video applications. This approach may, however, be inefficient in a satellite network based on a TDMA scheme. To overcome this problem, we have designed a demand assignment satellite bandwidth allocation algorithm in TDMA, named V2L-DA (VBR 2-Level Demand Assignment), which manages the VBR video traffic according to a dynamic bandwidth allocation algorithm. In this paper we discuss how to tune the proposed algorithm in order to optimize network utilization when MPEG-1 VBR video traffic is being transmitted. Our results indicate that most of the time only 40% of the peak rate bandwidth is needed to satisfy the VBR source, so the remaining 60% of the peak rate bandwidth can be used to transmit the datagram traffic queued in the network stations.