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Localized mobility protocols are designed to address many of the drawbacks such as additional signaling and over-the-air tunnel overhead associated with global mobility protocols like Mobile IPv4 and Mobile IPv6. Proxy Mobile IPv6 is one such network controlled localized protocol defined in the IETF. Although Proxy Mobile IPv6 can resolve longer binding update and tunnel overhead related issues when a mobile node's movement is confined to a specific domain, some of the handoff-related functions and data paths between two communicating nodes still need to be optimized.
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