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 00022
The generating method according to Claim 2, wherein the specific steps are as follows when the UE switches from the EUTRAN to a GERAN:b1: 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;b2: after receiving the KSIASME together with the IK and the CK from the MME, the SGSN generates a Kc of the GERAN based on the IK and the CK, assigns the value of the KSIASME to a CKSN of the GERAN, and stores the CKSN of the GERAN together with the Kc of the GERAN; the SGSN sends a message of indicating mapping completion of the CKSN of the GERAN to the MME; and the MME sends a switching command to instruct the UE to switch; andb3: after receiving the switching command from the network, the UE maps the KSIASME into a CKSN of the GERAN, and stores the CKSN of the GERAN together with the Kc of the GERAN generated from the KASME.