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written 6.8 years ago by gravatar for meghalikalyankar meghalikalyankar • 2.3k modified 2.8 years ago by gravatar for pedsangini276 pedsangini276 • 4.8k

Subject: Mobile Communication and Computing

Topic: Mobile Network

Difficulty: Low
mobile communication
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written 6.7 years ago by gravatar for meghalikalyankar meghalikalyankar • 2.3k

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Having received a COA, the MN has to register with the HA. The main purpose of the registration is to inform the HA of the current location for correct forwarding of packets.

Registration can be done in two different ways depending on the location of the COA. If the COA is at the FA, the MN sends its registration request containing the COA to the FA which forwards the request to the HA. The HA now sets up a mobility binding, containing the mobile node’s home IP address and the current COA. It also contains the lifetime of the registration which is negotiated during the registration process.Registration expires automatically after the lifetime and is deleted; so, an MN should reregister before expiration. This mechanism is necessary to avoid mobility bindings which are no longer used. After setting up the mobility binding, the HA sends a reply message back to the FA which forwards it to the MN.
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