U.S.Patent Apr.9,2019 Sheet 4 of 10 US10,257,802B2 12 10 13 MN MAG SDN LMA Network controller 801.L2 attach request message -802.Bearer message 803.First establishment message and first 803.Second adjustment message establishment message and second adjustment message 804.Establish a tunnel 805.Establish a tunnel on the MAG side on the LMA side Establishment of the tunnel succeeds 807.RA ←806.RA messago- message 808.Packet 809.Packet data- 810.Packet data data 812.Packet 811.Packet data 811.Packet data data FIG.8 903 901 902 Transmitter Processor Receiver FIG.9U . S . Patent Apr . 9 , 2019 Sheet 4 of 10 US 10 , 257 , 802 B2 11 13 MN MAG SDN controller LMA Network 801 . L2 attach request message - 802 . Bearer message 803 . First establishment message and first adjustment message 803 . Second establishment message and second adjustment message 804 . Establish a tunnel on the MAG side 805 . Establish a tunnel on the LMA side Establishment of the tunnel succeeds 807 . RA R - 806 . RA message message 808 . Packet data - 809 . Packet data 810 . Packet data _ _ 812 . Packet data - 811 . Packet data 811 . Packet data FIG . 8 903 - 901 902 655 Transmitter Processor Receiver FIG . 9