Research Article
TCP Performance in Hybrid Satellite - WiFi Networks for High-Speed Trains
@INPROCEEDINGS{10.1007/978-3-642-23825-3_12, author={Giovanni Giambene and Silvia Marchi and Sastri Kota}, title={TCP Performance in Hybrid Satellite - WiFi Networks for High-Speed Trains}, proceedings={Personal Satellite Services. Third International ICST Conference, PSATS 2011, Malaga, Spain, February 17-18, 2011, Revised Selected Papers}, proceedings_a={PSATS}, year={2012}, month={5}, keywords={Satellite Networks WiFi Inter-segment (Vertical) Handover MIH MIPv6 TCP}, doi={10.1007/978-3-642-23825-3_12} }- Giovanni Giambene
Silvia Marchi
Sastri Kota
Year: 2012
TCP Performance in Hybrid Satellite - WiFi Networks for High-Speed Trains
PSATS
Springer
DOI: 10.1007/978-3-642-23825-3_12
Abstract
Satellite communications have a significant potentiality in the railway scenario, but suffer from strong variations in the received signal power and need suitable solutions to deal with long channel disruptions due to tunnels. The approach envisaged in this paper is based on the adoption of a hybrid network (satellite and terrestrial WiFi coverage) and a (VHO) scheme to switch seamlessly from one segment to another whenever link quality degrades and a new segment is available. Details are provided for the adoption of MIH and MIPv6 in such a context, referring to the BSM standard. Transport layer performance is evaluated considering different TCP versions (e.g., NewReno, BIC, and CUBIC) as well as possible cross-layer approaches to improve the performance in the presence of VHOs. Design criteria are provided taking into account train speed and overlap area size. Finally, interesting TCP performance results are achieved by updating the ssthresh value and limiting the cwnd value after VHOs by means of cross-layer approaches. This work has been carried out within the framework of the ESA SatNEx III project.