Patent ID: 8959343
Filing Date: 2015-02-17
Classification: H04L,H04W

Abstract:
1. An authentication system, comprising an Application Server, AS, providing a non-Internet Protocol Multimedia Subsystem, IMS, service, an authentication gateway and an IMS user equipment, wherein: the AS is configured to forward a connection request message transmitted from the IMS user equipment to the authentication gateway and a first random number transmitted from the authentication gateway to the IMS user equipment, to transmit a first response value, generated from the first random number, fed back from the IMS user equipment to the authentication gateway and to provide the IMS user equipment with the non-IMS service in response to an instruction of the authentication gateway; the authentication gateway is configured to acquire the first random number and an expected response value of the IMS user equipment, to transmit the acquired first random number to the AS, to ascertain that the IMS user equipment has been authenticated successfully when comparison of the first response value transmitted from the AS with the acquired expected response value shows consistency and to instruct the AS to provide the IMS user equipment with the non-IMS service; and the IMS user equipment is configured to transmit the connection request message to the AS, to generate the first response value from the first random number transmitted from the AS and to transmit the generated first response value to the AS.