Patent ID: 9027081
Filing Date: 2015-05-05
Classification: H04L,H04W

Abstract:
1. A method for use in a mobile radio communications device network connection procedure, the method comprising: at a network, sending to a mobile radio communications device a first list of a plurality of security algorithms supported in the network including both an Access-Stratum (AS) and Non-Access-Stratum (NAS) security container, the network being an upgraded network and the mobile radio communications device being a non-upgraded device; at the mobile radio communications device, in response to receiving the first list of the plurality of security algorithms supported in the network, sending an AS confirmation message, which is not integrity protected, and subsequently sending a NAS registration update message and a second list including supported security algorithms and unsupported security algorithms in the mobile radio communications device, the unsupported security algorithms being indicated separately from the supported security algorithms; and at the network, generating and sending an AS security mode command message upon receipt of the NAS registration message based on the second list provided to the network.