Patent ID: 9197669
Filing Date: 2015-11-24
Classification: H04L,H04W

Abstract:
1. A method for establishing a first security context between a remote station and a serving network, the first security context having a security property that is not supported by a second security context, the method comprising: forwarding, by the remote station, a first message to the serving network, wherein the remote station supports secure wireless communications using either the first security context or the second security context, the first message includes an information element signaling that the remote station supports the first security context, and the second security context provides secure wireless communications without supporting use of the information element; generating, by the remote station, a session integrity key and a session cipher key, in accordance with the first security context, using the information element; receiving, by the remote station in response to the first message, a second message having a message authentication code that indicates the serving network supports the first security context for secure wireless communications with the remote station, which first security context includes use of the information element not supported by the second security context; checking, by the remote station, the message authentication code using the session integrity key; and in response to successfully checking the message authentication code, having, by the remote station, wireless communications protected by the session cipher key.