| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a mobile communication gateway for maintaining the synchronization of respective call state between an active system and a preliminary system even if the inversion of a packet sequence and a loss of a packet occur. <P>SOLUTION: The mobile communication gateway device is used for transferring user traffic to a second node for providing a communication service from a first node for connecting a terminal thereto. In a switch, a call processing packet transmitted from the first node is replicated, one side is used as a first call processing packet and the other side is used as a second call processing packet, the first call processing packet is transmitted to a call processing part of an active system, the second call processing packet is transmitted to a call processing part of a preliminary system, the first call processing packet transmitted from the active system is transmitted to the first node, the second call processing packet transmitted from the preliminary system is discarded, and whether the call state of the active system coincides with that of the preliminary system is detected based on transmission/reception states of the first and second call processing packets. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
