Study on feasibility of SATCOM for railway communication

Final Report
C.7 SATCOM SOLUTION 7: GEO / C-BAND BASED ON DVB-S2X / DVB-RCS2
GEO / C-band
Criterion ID Criterion Evaluation Justification
CRT-TECH-1
The “link availability” of the proposed satcom system shall be
High.
C (Low)
Link availabilities in GEO C-band systems (taking into account satellite parameter
from current deployments) can be reached when adequate terminal performances
are selected (e.g. BUC power, antenna size/type and modem configuration) and
considering the maximum data rate (i.e. low date rate) of the railway applications
assumed in the scope of this assessment.
CRT-TECH-2 The “reliability” of the proposed satcom system shall be High. C (High)
Satellites are in general designed with a very high reliability, since they cannot be
repaired. In addition, and considering that lots of satcom solutions currently
deployed are based on GEO/C-band systems, redundancy can be assumed for a
possible GEO solution operating the C-band.
For ground segment elements, mechanisms such as redundancy and backup can
be used in order to increase reliability.
Finally, MTBF and MTTR requirements shall be considered when designing
railway terminals in order to comply with reliability criterion.
CRT-TECH-3
The end-to-end error ratio of the proposed satcom system shall
be Low.
Note: Since this criterion only considers the satellite system,
the error ratio shall be measured after the last satellite
communication
C
DVB-S2X/RCS2 standards provides mechanisms to guarantee high level of
service continuity implementing mechanisms such as FEC, LL-FEC,
retransmissions (ARQ), etc. Therefore, this GEO/C-band solution based on these
standards is able to provide a low end-to-end error ratio.
Doc.Nº: SRAIL-FNR-010-IND
Edit./Rev.: 1/1
Date: 16/02/2017
Page 255 of 285