Patent ID: 9167424
Filing Date: 2015-10-20
Classification: H04L,H04W

Abstract:
1. A method of handling security in a Single Radio Voice Call Continuity (SRVCC) handover for a mobile device having a plurality of Circuit-Switched (CS) domain keys and a plurality of Packet-Switched (PS) domain keys in a wireless communication system, the method comprising: having an active CS service or a Radio Resource Control (RRC) connection in a CS domain and an active PS connection in a PS domain when the mobile device is served by a first network, wherein the first network supports the CS domain and the PS domain; receiving a handover command to handover from the first network to a second network, wherein the second network supports the PS domain; deriving a plurality of security keys used in the second network from the plurality of CS domain keys used in the first network; applying the plurality of security keys for transmission and reception in the second network; and setting an evolved Key Set Identifier (eKSI) to an initial value, which is an arbitrary number between 0 and 7 and is not associated with the first network, or to a Key Set Identifier (KSI) associated with the plurality of CS domain keys used in the first network; wherein the first network sends the KSI to the second network, the KSI is associated with the plurality of CS domain keys used in the first network, the second network sets an eKSI to the KSI, and the first network is a mobile switching center.