Connection precedence and preemption in military asynchronous transfer mode (ATM) networks

While currently employed asynchronous transfer mode (ATM) prioritization schemes grant precedence to cells in the network, high precedence connections may be locked out when the requested network resources are unavailable. An algorithm introduced in this paper prevents lockout by considering connection precedence when making the admission decision and preempting lower precedence connections when the requested resources are unavailable. No modification is required to the selected connection admission control algorithm and the network manager may configure precedence assignment and preemption policies for network-specific optimization. The algorithm is ideal for ATM networks with a central controller, such as a wireless-ATM network or ATM-over-DAMA satellite network, because it uses modified ATM Forum standard signaling to leverage the central controller´s knowledge of the network. In addition, solutions are presented for backward compatibility, security, and preempted connection restoration