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The invention of mobile devices such as laptops, hand-held computers, and cellular phones has changed the whole Internet world. The main feature of mobile devices is that they can access the Internet wirelessly by different air interfaces using different technologies while roaming. This makes mobile devices become increasingly popular. However, the traditional Internet does not support any needed features and architectural structures for mobility management. When a mobile device comes to the Internet, it will move from one sub-network to another sub network. However, the IP address of the mobile device will keep unchanged and the IP address can not reflect the new location due to the traditional addressing scheme of the Internet.
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