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 Vertical Handover (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. © Institute for Computer Sciences, Social Informatics and Telecommunications Engineering 2011.
Giambene, G., Marchi, S., Kota, S. (2011). TCP Performance in Hybrid Satellite - WiFi Networks for High-Speed Trains. In Third International ICST Conference, PSATS 2011 Malaga, Spain, February 2011 (pp.116-130). Springer [10.1007/978-3-642-23825-3_12].
TCP Performance in Hybrid Satellite - WiFi Networks for High-Speed Trains
Giambene G.;
2011-01-01
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 Vertical Handover (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. © Institute for Computer Sciences, Social Informatics and Telecommunications Engineering 2011.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
https://hdl.handle.net/11365/47803
Attenzione
Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo