- A Hybrid Wireless architecture

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Registration in Control Zone

When an MN receives an AP Beacon for the first time, it sends a registration request to the IN through the next hop to this IN. It then waits for the registration acknowledgement, after which it considered registered with the IN. The IN as well as the MN timeout their registration entries after the timeout period, which is the same for both of them. This timeout period is refreshed by different mechanisms at the IN and the MN:

If an already registered MN finds a better IN, it can send a registration request to the new IN, which will inform the HA of the MN about the change.