Patent ID: 9699820
Date: 2017-07-04
CPC Classifications: H04L,H04W

Claim:
1. Method for a mobile device to establish a device-to-device (D2D) communication session with a further mobile device, the mobile device being connectable via a D2D communication channel to the further mobile device and the mobile device being connectable to a mobile network, comprising: preloading an initiation key on the mobile device, the initiation key being associated with a validity period; and on each of the mobile devices: verifying a validity of the initiation key based on a current time; if the initiation key is deemed valid, generating a session key using the initiation key by using the initiation key in performing a key agreement procedure with the further mobile device over the D2D communication channel, the key agreement procedure resulting in the session key if the initiation key used by the mobile device matches an initiation key used by the further mobile device; and establishing the D2D communication session over the D2D communication channel based on the session key.