Fuzzy adaptive connection admission control for real-time applications in ATM-based heterogeneous networks

In this paper, we study connection-oriented communication service in hetero geneous network for real-time applications. Many existing distributed missi on-critical systems are deployed over heterogeneous networks. Hence, it is necessary to extend the real-time communication technology to encompass het erogeneous networks. A connection can be considered as a contract between a n application and the network: the application specifies the characteristic s of the traffic which it may generate and the network agrees to provide th e requested quality of service (QoS) to the application. For real-time appl ications, the most crucial QoS is to meet deadline requirement. We propose a fuzzy intelligent system for connection admission control (CAC ). Upon a request of connection establishment, the CAC determines if the wo rst case delays of the requesting and existing connections can be satisfied given the available network resources. If so, the CAC allocates appropriat e network resources to the requesting connection. Our system uses fuzzy log ic to capture the knowledge for adapting its strategy to dynamic system sta tus. Our performance study demonstrates that system performance can be impr oved significantly and consistently with our fuzzy adaptive connection admi ssion control. Our approach is compatible with current network standards an d hence can be readily used in practical systems.