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MIH Signaling Example 1: Directly Over UDP/IP Mobile Node Cellular WLAN Mobility Manager Power up: connect to WLAN Send a request for IS (e.g. NL) and set application timer T1 ACK not received timeout after T1 Retransmit request for IS and re-set application timer T1 Send IS response (with piggy backed ACK) and set application timer T1 Send ACK Send ‘Link Up’ ES to inform about HO completion (no ACK required) Session continues over cellular 1 2 3 4 5 6 7 MN then decides to move to cellular (based on radio conditions) Obtain Neighbor List |