Connection Level Stability Analysis of the Internet using the Sum of Squares Technique

We study connection-level models of file transfer requests in the Internet, where connection arrivals to each route occur according to Poisson processes and the file-sizes have phase-type distributions. We investigate the use of the Sum-of-Squares (SoS) technique to construct Lyapunov functions that satisfy Foster’s condition for stochastic stability. The methodology is used to numerically establish the connection-level stability of linear and star network topologies when the load on each link is less than its capacity.