Study on feasibility of SATCOM for railway communication

Final Report
GEO / C-band
Criterion ID Criterion Evaluation Justification
CRT-TECH-12
The proposed satcom system for the FRMCS shall provide
“user-to-user” and “multi-user” types of communications for
both voice and data services. In addition, each communication
can be bi-directional or uni-directional with any type of
asymmetry between forward and return channels (when bidirectional).
C
This solution is based on DVB-S2X and DVB-RCS2+M standards, which allow
most of the communications types required except the multicast on the return link
(i.e. the user to multi-user from the remote terminal point of view). In this case, an
extra implementation at IP level should be required to support this particular
communication type.
CRT-TECH-13
The minimum required coverage of the satcom system shall be
Europe.
C
This is a generic solution based on GEO/C-band satellite constellation. Therefore,
satellites should be selected in order to provide full coverage to the pan-European
area.
Currently, solutions like the Intelsat EpicNG provide C-band coverage (and Kuband
in this case) to the pan-European area.
CRT-TECH-14
The satcom system shall provide communications for remote
terminals when stationary and when travelling at speeds up to
the maximum allowable line speed or 500 km/h, whichever is
the lower.
C
The air interface has a relevant impact on the error budget along with the
frequency band (C-band). GEO satellite contribution is neglected due to use of
very good reference clocks and no movement of the satellite. Therefore, DVB-S2X
and RCS2+M standards are going to support speeds up to 500 Km/h without
problems (since they provide the mechanisms for high-speed environments, such
as Doppler compensation).
CRT-TECH-15
The proposed satcom system shall be flexible to support (at
least) new created apps in the future.
C (High)
Since this solution is based on DVB-S2X/RCS2+M standards (which have been
designed to provide high level of flexibility with lots of modcods and bandwidth
channelization), this system can be considered highly flexible, enabling higher
modcods that increase the efficiency of the system.
CRT-TECH-16
The proposed satcom system shall be highly and easily
scalable.
C (High)
Despite C-band spectrum limitations, this solution can offer high scalability by
means of techniques such as multi-beam and frequency reuse.
Doc.Nº: SRAIL-FNR-010-IND
Edit./Rev.: 1/1
Date: 16/02/2017
Page 258 of 285