Patent ID: 8412157

Claim:
A method for security protection of a user identity (ID) in an initial connection signaling message, the method comprising: activating a control plane (C-plane) packet data convergence protocol (C-PDCP) layer upon power up of a wireless transmit/receive unit (WTRU); generating initial security parameters from system information received by the WTRU upon the power up of the WTRU; loading the initial security parameters to the C-PDCP layer; ciphering the initial connection signaling message including the user ID using the initial security parameters, an f8 algorithm being used for the ciphering and the initial security parameters including a ciphering key (CK), a COUNT-C value, a bearer ID, a direction value, and a length value, the COUNT-C value being a pre-arranged value; and transmitting the ciphered initial connection signaling message and the user ID, the initial connection signaling message including a public land mobile network (PLMN) identity.