Study on feasibility of SATCOM for railway communication

Final Report
Inmarsat 4 (BGAN) - Inmarsat 6 (ICE)
Criterion ID Criterion Evaluation Justification
CRT-TECH-7
CRT-TECH-8
The call establishment delay for the proposed satcom system
shall be Low.
Note: as a first reference, GSM-R establishment delays can be
considered.
The proposed satcom system shall allow (at least) the
estimated number of European FRMCS users by 2030
registered simultaneously.
NC
PC
Inmarsat call establishment delays are: 22
- Ground-to-air: 25 s (P95); 30 s (P99).
- Air-to-ground: 10 s (P95); 15 s (P99)
Therefore, this criterion is considered "NC".
Inmarsat is able to provide the required service to current GSM-R data users. But
it will not be able to provide service also to the estimated numbers of voice
services users.
CRT-TECH-9
The proposed satcom system shall provide priority and preemption
mechanisms.
C
Each I4 connection is established with a certain set of Quality of Service (QoS)
parameters, which include the following:
- Rate Parameters: Mean Rate and Peak Rate;
- Delay Parameters: Target Latency and Discard Latency; and
- Connection Type and Priority.
CRT-TECH-10
The proposed satcom system shall support Data and Voice
services.
C
I4 supports data and voice services. Although I4 voice applications are mainly
processed by its Circuit Switched subsystem, it is also capable to process IP voice
services by means of its Packet Switched part.
CRT-TECH-11
The proposed satcom system shall support as minimum Low
bandwidth applications
C
Inmarsat 4 provides speeds up to more than 400 kbps. Therefore, it is able to
support critical railway applications, and even some performance and/or business
applications.
22
P95: with a probability of 95%; P99: with a probability of 99%
Doc.Nº: SRAIL-FNR-010-IND
Edit./Rev.: 1/1
Date: 16/02/2017
Page 235 of 285