Study on feasibility of SATCOM for railway communication

Final Report
GEO / Ku-band
Criterion ID Criterion Evaluation Justification
CRT-TECH-8
The proposed satcom system shall allow (at least) the
estimated number of European FRMCS users by 2030
registered simultaneously.
C
The use of a TDM/MF-TDMA (DAMA) mechanisms based on DVB-S2X/RCS2
respectively will help, along with the use of some other techniques such as
frequency reuse, to allow the estimated users by 2030. In addition, the use of the
Ku-band can enable not only critical applications, but also performance and/or
business applications.
CRT-TECH-9
The proposed satcom system shall provide priority and preemption
mechanisms.
C
The design of this solution shall include priority and pre-emption mechanisms. It
can be assured by the use of the DVB-S2X/RCS2 communications standards,
since they support and manage layer 2 QoS with the use of differentiated queues
for different types of traffic (real time, critical data, best effort...).
The DAMA mechanism also assures the resources assignment to users by means
of several schedule techniques such as Continuous Rate Assignment (CRA),
Rate/Volume Based Dynamic Capacity (RBDC/VBDC), Free Capacity Allocation
(FCA), etc.
CRT-TECH-10
The proposed satcom system shall support Data and Voice
services.
C
Generic GEO/Ku-band IP satcom solutions are able to provide voice and data IP
services.
CRT-TECH-11
The proposed satcom system shall support as minimum Low
bandwidth applications
C (High)
Generic satcom GEO / Ku-band solution can support not only low bandwidth
applications, but also broadband applications. It means that critical railway
applications can be supported and also some other such as performance and/or
business apps.
It is worth mentioning that Ku and mainly Ka bands can take advantage of High
Throughput Satellites (HTS) to offer users very high data rates.
Doc.Nº: SRAIL-FNR-010-IND
Edit./Rev.: 1/1
Date: 16/02/2017
Page 273 of 285