Patent ID: 9232452
Filing Date: 2016-01-05
CPC Classification: H04W

Claim Text:
1. A method of handling an inter-radio access technology, hereinafter called RAT, handover for a mobile device, the method comprising: when the mobile device uses a E-UTRAN to receive a message requesting device capability corresponding to a UTRAN before the mobile device performs a handover to a target network using the UTRAN, sending a capability message comprising an INTER RAT HANDOVER INFO message to a serving network using the E-UTRAN; and when, during the handover from the serving network using the E-UTRAN to the target network using the UTRAN, a connection to the target network is established successfully, using a START value of a packet switched domain for ciphering and transmitting the START value to the target network with a UE CAPABILITY INFORMATION message; wherein the message requesting the device capability corresponding to the UTRAN is a UE CAPABILITY ENQUIRY message, and the capability message transmitted to the E-UTRAN is the UE CAPABILITY INFORMATION message.