System and method for overload control in a next generation...

Details System and method for overload control in a next generation... System and method for overload control in a next generation...

Category

H - Electricity

Subcategory

04

Subsubcategory

L

IPC codes

H04L 29/06 (2006.01) H04M 7/00 (2006.01)

Type

Patent

Patent number

CA 2662842

Description

A Call Server in a network is able to monitor an offered rate of incoming calls per Access Gateway (AGW). A calculated GlobalLeakRate can be distributed between the AGWs in proportion to the traffic rate they offer. A leak rate calculation method is used to calculate the GlobalLeakRate control parameter of the ETSI_NR restrictor at an overloaded Control Server. The leak rate calculation is based on the POTS call rejection rate. In one particular embodiment of the present invention, the calculation is based on bringing the call reject rate close to a configurable low target reject level. An MGC is able to identify the end of an overload event with a greater degree of confidence and an AGW is able respond appropriately if the AGW is prematurely instructed to stop the control.

La présente invention concerne un serveur d'appel dans un réseau, capable de surveiller un taux proposé d'appels entrants par passerelle d'accès (AGW). Un taux de fuite global (GlobalLeakRate) calculé peut être distribué entre les AGW, au pro rata du taux de trafic qu'ils proposent. Un procédé de calcul du taux de fuite sert à calculer le paramètre de commande GlobalLeakRate du restricteur ETSI_NR sur un serveur de commande surchargé. Le calcul du taux de fuite se base sur le taux de refus d'appels POTS. Dans un mode de réalisation particulier, le calcul se base sur le fait d'approcher le taux de refus d'appels d'un niveau de rejet cible faible et configurable. Un MGC peut identifier la fin d'un événement de surcharge, avec un degré de confiance supérieur et un AGW peut répondre de manière appropriée s'il est prématurément demandé à l'AGW d'arrêter la commande.

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