ASYNCHRONOUS TRANSFER MODE CALL ADMISSION CONTROL SCHEME WITH PLURAL QUALITY CLASSES

In an asynchronous transfer mode (ATM) network, various calls with dif ferent trans-mission quality requirements ranging from low bit-rate da ta signals to high bit-rate motion picture signals are applied. Theref ore, it is important to determine how to allocate network resources to those calls and to judge whether those calls can be accepted. This pa per proposes a call admission control scheme based upon a data table t hat holds the relationship between average bit-rate and needed bandwid th for aggregated signals in each quality class obtained beforehand by simulation. This proposed scheme assumes broadband services where the aver-age bit rate and burstiness of aggregated signals can be estimat ed clearly with predictable value ranges. This proposed scheme uses a conventional scheme for service quality class control. The following c harac-terizes this proposed scheme: (1) it is suitable for real time c all processing because it has small table search processing and a simp le table search algo-rithm; (2) it realizes more accurate control due to a decreased data volume requirement and more precise data preparati on than is the case for some of the conventional schemes; (3) it can b e expanded easily to handle increases in the number of quality classes ; and (4) it provides control in terms of statistic multiplexing effec ts between each quality class (also found in some of the conventional schemes).