In {TAIL ~ case} the connection of a second interface is changed from MAG 221 of a home PMIPv6 domain to {HEAD ~ AR} 222 of a CMIPv6 domain 231, a BU message 262 is transmitted from the second interface to LMA/HA 250, and identification information of this BU message is notified to MAG from the first interface 
In { TAIL ~ case } the connection of a second interface is changed from MAG 221 of a home PMIPv6 domain to { HEAD ~ AR } 222 of a CMIPv6 domain 231 , a BU message 262 is transmitted from the second interface to LMA / HA 250 , and identification information of this BU message is notified to MAG from the first interface
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