TCP Hybla: a TCP enhancement for heterogeneous networks

In heterogeneous networks, TCP connections that incorporate a terrestrial or satellite radio link are greatly disadvantaged with respect to entirely wired connections, because of their longer round trip times (RTTs). To cope with this problem, a new TCP proposal, the TCP Hybla, is presented and disc...

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Bibliographic Details
Published in:International journal of satellite communications and networking 2004-09, Vol.22 (5), p.547-566
Main Authors: Caini, Carlo, Firrincieli, Rosario
Format: Article
Language:English
Subjects:
Access methods and protocols, osi model
Applied sciences
congestion control
Exact sciences and technology
Satellite telecommunications. Space telecommunications
TCP/IP
Telecommunications
Telecommunications and information theory
Teleprocessing networks. Isdn
wireless communications
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Summary:In heterogeneous networks, TCP connections that incorporate a terrestrial or satellite radio link are greatly disadvantaged with respect to entirely wired connections, because of their longer round trip times (RTTs). To cope with this problem, a new TCP proposal, the TCP Hybla, is presented and discussed in the paper. It stems from an analytical evaluation of the congestion window dynamics in the TCP standard versions (Tahoe, Reno, NewReno), which suggests the necessary modifications to remove the performance dependence on RTT. TCP Hybla performance is firstly evaluated in the case of an ideal channel, with good correlation between analytical and simulation data. Then, more realistic situations, which require the adoption of a benchmark network topology and a careful ns‐2 simulation set‐up, are examined. In particular, TCP Hybla performance is compared with that achievable by TCP standard in the presence of congestion and link losses, either separately or jointly considered. In all the examined cases, the superiority of TCP Hybla is evident, as it greatly reduces the severe penalization suffered by wireless, and especially satellite, TCP connections. Finally, it is worth noting that TCP Hybla does not infringe the end to end semantics of TCP and is compatible with other promising enhancements. Copyright © 2004 John Wiley & Sons, Ltd.
ISSN:1542-0973
1542-0981
DOI:10.1002/sat.799