| Resumen |
Asynchronous Transfer Mode (ATM) is a high-speed packet switching technology of various types of communications services, such as voice, video and data that are transferred over high speed link. ATM switches make the decision of accept or reject connections based on the achievement of a required quality of service. The decision of whether accepts or reject a connection is done by a mechanism called Call Admission Control (CAC). This is a preventive congestion control mechanism carried out during the call set-up process, is at this point where the quality of service and parameters of the connection are specified. Each switch has to execute its own CAC, these switches check for the availability of sufficient bandwidth in the links, processing power and buffer space. This work proposes a fuzzy logic algorithm to implement CAC decision into ATM networks. Fuzzy logic bases its decisions on inputs in the form of linguistic variables derived from membership functions (MFs). MFs are used to determine the fuzzy set to which a value belongs and the degree of membership in that set. Two proposed fuzzy CAC architectures, their inputs and outputs and the description of their fuzzy rules, as well as the summarised processes carried out to develop the algorithms for CAC are reported. |
