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Transport Mechanism for Reliable MIH Message Delivery Sender of MIH message may request an acknowledgement Done by setting ACK Request bit in MIH message Sender sets retransmission timer based on type of MIH message (i.e. Information, Event, Command) If ACK does not arrive within timeout period then retransmit If ACK arrives within timeout then assume message delivered correctly If ACK Request bit was set, the receiver shall send an ACK message Done by setting ACK Respond bit in MIH message ACK can be piggy backed with data |