A Dynamic Delayed ACK Control Scheme and Its Evaluation on MobileIP Networks

Yuko ONOE  Yukio ATSUMI  Fumiaki SATO  Tadanori MIZUNO  

IEICE TRANSACTIONS on Communications   Vol.E85-B   No.10   pp.2117-2125
Publication Date: 2002/10/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Mobile Multimedia Communications)
mobile telecommunication,  MobileIP,  TCP/IP,  mobile protocols,  IP-based hand-over,  

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During TCP/IP communications, MobileIP routing optimization functions causes out-of-order TCP packet sequences. To solve this problem, we propose a dynamic delayed ACK control scheme in which the wireless link-state management part notifies the upper TCP/IP layer of base-station hand-over, and at this time the TCP/IP layer sends dynamic delayed ACKs in response by using two-level-timer (i.e., hard-timer and soft-timer) processing. Simulation results confirm that applying dynamic delayed ACK control to MobileIP networks improves average throughput.