Pre-Grant Publication Number: 20110135095
Filing Date: December 29, 2008Priority Date: June 16, 2008
Inventors: Xuwu Zhang, Lu Gan, Qing Huang
Assignee(s): ZTE CORPORATION
Current U.S. Classification: 380, 380/272000
View Prior Art for Claim 00019
The generating method according to Claim 2, wherein the specific steps are as follows when the UE switches from the EUTRAN to a UTRAN:a1: after receiving a switching request message, the MME generates an IK and a CK based on the KASME, and sends the KSIASME together with the IK and the CK which are generated from the KASME to the SGSN through a forward and redirect request message;a2: after receiving the KSIASME together with the IK and the CK from the MME, the SGSN maps the KSIASME into a KSI, and stores the KSI, the IK and the CK together; the SGSN sends a forward and redirect response message of indicating mapping completion of the KSI to the MME; and the MME sends a switching command to instruct the UE to switch; anda3: after receiving the switching command from the network, the UE maps the KSIASME into a KSI, and stores the KSI together with the IK and the CK which are generated from the KASME. 
