Patent ID: 8462742
Filing Date: 2013-06-11
Classification: H04L,H04W

Abstract:
1. A method for optimizing an authentication procedure during inter access system handovers in a heterogeneous network, comprising the steps of: deriving new keys for accessing a new system from most recent system access keys of an existing system; enabling an authentication procedure during a User Equipment (UE) handover from the existing system to the new system by using the most recent system access keys of the existing system; wherein the UE handover comprises at least one of the following: wherein the backward handover from the SAE access system to the I-WLAN comprises checking a Home Subscription Server (HSS), by an Authentication, Authorization and Accounting (AAA) server, to determine whether any AAA is registered, and if not, performing, by the AAA server, a soft registration in which the AAA server generates a Master Session Key (MSK), a Transient Encryption Key (TEK), and an Extended MSK (EMSK) using a Network Access Identifier NAI), the CK and the IK, generates the temporary ID including a pseudonym ID and a fast re-authentication ID, protects the temporary ID using the TEK and sends it to the UE.