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With the functionalities of obtaining new care-of-address (CoA) ahead and building tunnels for packet forwarding during handover, the fast handover scheme has better performance than Mobile IPv6. However, the handover performance is downgraded if mobile node (MN) cannot finish the handover preparation before the associated link is broken. In this paper, we propose an optimistic ready-tunneling (ORT) control scheme to resolve the aforementioned problems. In the proposed ORT scheme, new access router (NAR) can prepare for a new CoA and builds a tunnel for MN ahead when MN enters the domain of NAR. As a result, MN can switch to the new network domain smoothly because of early CoA acquisition and tunnel establishment during handover.
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