In case the connection of {HEAD ~ a second interface} is changed from MAG 221 of a home PMIPv6 domain to AR 222 of {TAIL ~ 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 case the connection of { HEAD ~ a second interface } is changed from MAG 221 of a home PMIPv6 domain to AR 222 of { TAIL ~ 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
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH