| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a security mode method in which a mobile station is capable of reducing the number of dropped calls even if non-integrity-protected layer 3 messages and integrity protection initiation messages are processed out-of-order. <P>SOLUTION: The security mode method receives (210) a layer 3 message in a first domain from a network, determines (220) if the layer 3 message has integrity protection information, ascertains (240) if a security mode has been initiated in the first domain, and forwards (260) the layer 3 message to an upper layer, if the layer 3 message lacks integrity protection information and a security mode has not been initiated in the first domain even if security mode has been initiated in a second domain. This method allows the mobile station to process a non-integrity-protected layer 3 message from one domain even if integrity protection has been initiated in another domain. <P>COPYRIGHT: (C)2007,JPO&INPIT |
