Patent ID: 7652989
Filing Date: 2010-01-26
Classification: H04L

Abstract:
1. A method of performing adaptive connection admission control in consideration of input call states in a Differentiated Services (DiffServ) network, the DiffServ network including a bandwidth broker, a plurality of ingress and egress edge nodes and a plurality of core nodes, the method comprising the steps of: a) a corresponding ingress edge node performing connection admission control for a new connection within an amount of bandwidth initially allocated to each of paths between the ingress and egress edge nodes; b) the corresponding ingress edge node comparing an amount of remaining bandwidth allocated to a specific path Pr with an amount of bandwidth required for a connection setup requesting call input to the corresponding ingress edge node, and calculating an amount of additional bandwidth to be requested from the bandwidth broker when the corresponding ingress edge node determines that the amount of the remaining bandwidth does not satisfy the amount of the bandwidth required for the connection setup requesting call; c) the corresponding ingress edge node requesting additional bandwidth from the bandwidth broker on the basis of the calculated amount of the additional bandwidth, changing bandwidth information of the corresponding path Pr, and performing connection admission control, wherein the calculated amount takes into account an average of time intervals at which allocation of additional bandwidth is requested from the bandwidth broker; and d) decreasing the amount of additionally allocated bandwidth when the amount of the additionally allocated bandwidth is not exhausted within a certain range, and returning the decreased amount of the additionally allocated bandwidth to the bandwidth broker; wherein the step d) comprises the steps of: comparing an amount of bandwidth UBWi being used at current time Ti of the amount of the additionally allocated bandwidth with an amount of bandwidth UBWi.1actually used at previous time Ti−1; and decreasing an amount of currently available bandwidth BWi of the corresponding path Pr when a difference between the amount of the bandwidth UBWi and the amount of the bandwidth UBWi.˜is equal to or greater than a preset threshold.