Performance modeling of window based flow control in a multihop packet radio LAN

A hybrid model is used to evaluate the end-to-end performance of a multihop packet radio LAN, operating under a window based flow control mechanism. The model consists of radio data-link layer, transport layer, and application layer queuing representations. The radio data-link layer is modeled by using a simulator, written for a specific CSMA-type channel access algorithm. A multichain closed queuing network for the virtual circuit based end-to-end model is solved using an approximate mean value analysis (MVA) algorithm with modified convergence schemes. Network performance measures such as end-to-end delivery delay and throughput are computed from the analysis of the hybrid model. How the network bottleneck drifts around the network with varying application service times of the terminal radio stations is studied