VA-TCP: a vertical handoff-aware TCP

Authors:
Yu-Chieh Lin;Hsung-Pin Chang
Affiliations:
National Chung Hsing University, Taichung, Taiwan;National Chung Hsing University, Taichung, Taiwan
Venue:
Proceedings of the 2007 ACM symposium on Applied computing
Year:
2007

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Abstract

A vertical handoff occurs when a multi-homed mobile host roams from a network to another heterogeneous network. Nevertheless, the network before and after a vertical handoff usually have drastic different characteristics. In this paper, we proposed an end-to-end based Vertical-handoff Aware TCP, called VA-TCP, which promptly adapts TCP behavior during a vertical handoff. When entering a new network, on the basis of packet-pair algorithm, VA-TCP dynamically estimates the new network bandwidth and round-trip time by using out-of-band ICMP messages. After that, by the estimated bandwidth and round-trip time, VA-TCP adjusts the TCP parameters including congestion window size, slow-start threshold, retransmission timer and RTTs to respond to the new network environment. From the experimental result, the TCP throughput by the proposed VA-TCP scheme is around 2 times that by the original TCP.