Bandwidth variation and control for ATM networks

The asynchronous transfer mode (ATM) is considered a viable transport multiplexing technique for broadband integrated services digital networks (B-ISDNs). The impact on ATM network performance due to the varying bandwidth of services used is analyzed. A means of controlling the bandwidth crossover is presented. It is shown that, as more calls cross over from a lower to higher bandwidth, the network suffers from higher connection blocking. The crossover availability declines as more calls cross over and increase the bandwidth used. A slight increase in overall throughput is observed, since the network carries more crossover calls with the increased bandwidth. It is also shown that limitations can be placed on the amount of bandwidth that the crossover calls can occupy to protect the constant-bandwidth calls and keep and network connection blocking below a certain level. A dynamic bandwidth allocation algorithm is presented and evaluated as advantageous in terms of equitable bandwidth accessibility and overall cell throughput improvement