Optimized connection admission control for systems using adaptive modulation and coding techniques

摘要

A method is proposed for controlling the admission of connections in a wireless communication system between a base station and a subscriber unit, in which the modulation and coding scheme of the uplink and downlink can be varied over time. The method comprises the steps of receiving a request for a connection and of admitting the connection and updating the available bandwidth, if the available bandwidth corresponding to the current AMC scheme is greater than the admission bandwidth of the connection. Moreover the method periodically evaluates if the current admission bandwidth can be changed for a plurality of active connections: if this is the case, and there is not enough bandwidth to allow the change, the method stops the admission of new connections, suspends at least one active connection of said plurality of active connections or changes the AMC scheme of such at least one active connection. On the other hand, if the current admission bandwidth can be changed and there is enough bandwidth to allow the change, the method updates the current admission bandwidth for the plurality of active connections and updates the available bandwidth.