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An enhanced IEEE 802.11 Inter-Access Point Protocol (IAPP) is proposed to provide a unified solution for both intra and intersubnet handoff processes. The proposed enhancement relies on the access point's (AP's) interoperability with other APs, provided by the IP-based IAPP, so as to enable the intra and intersubnet link-layer frame buffering-and-forwarding. This enhancement not only eliminates frame losses during an intrasubnet handoff but, more importantly, realizes loss-free, fast intersubnet handoffs without modifying the IP-mobility protocols such as Mobile IP. Our ns-2-based simulation results show that the intersubnet handoff process is transparent to the mobile host's TCP session. Moreover, the enhanced IAPP supports higher user mobility and achieves a higher TCP throughput—up to 50 percent improvement over the original IAPP.
Index Terms- Mobile IP, IEEE 802.11 wireless LAN, fast/smooth handoff, TCP performance.

C. Chou and K. G. Shin, "An Enhanced Inter-Access Point Protocol for Uniform Intra and Intersubnet Handoffs," in IEEE Transactions on Mobile Computing, vol. 4, no. , pp. 321-334, 2005.
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