Abstract: Provided is a method of resource management and call admission control in an access network in a hierarchical manner.

Abstract: A method of allowing a network communication service user (subscriber) to receive a desired network communication service with a constant (the same) quality regardless of being in a wired or wireless communication environment based on a single service level agreement (SLA) of the subscriber is provided.

Abstract: A method for controlling call under use of ATM transfer capabilities call gap during the overload of an ATM switching network. The method comprises the steps of accepting a high priority call need first by means of call priority in a given time gap; and accepting the call in an order of DBR, SBR, ABR (ABT), and UBR service, in case that the call priority is the same, or in case that there is no call priority.

Abstract: An improved rare probability connection call registration method using an incomplete call causation message for an asynchronous transfer mode switching system, which includes the steps of receiving a candidate code from an operator and classifying a normal call and an abnormal call with respect to each call when a call cause message is received, increasing the number of completed calls when the received call is normally completed, and judging whether an incomplete call occurred due to the lack of a switching resource or the busy state of the subscriber at a destination in the case of the abnormal call, terminating the call when the cause of the abnormal call is due to another cause except for the lack of the switching resource, or the on-busy of the subscriber, increasing the number of the incomplete calls when the call is incompletely terminated due to the lack of the switching resource or the on-busy of the subscriber, and checking the call completion ratio, and terminating the call when the call completion