Study on feasibility of SATCOM for railway communication
SRAIL-FNR-010-IND%20-%20FinalReport_v1.1_20170216
SRAIL-FNR-010-IND%20-%20FinalReport_v1.1_20170216
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Final Report<br />
5. IDENTIFICATION OF CRITERIA FOR THE ASSESSMENT OF <strong>SATCOM</strong> SOLUTIONS<br />
Three types <strong>of</strong> criteria have been identified <strong>for</strong> the subsequent assessment <strong>of</strong> the <strong>SATCOM</strong> soluti<strong>on</strong>s<br />
proposed regarding their <strong>feasibility</strong> to support critical <strong>railway</strong> applicati<strong>on</strong>s:<br />
<br />
<br />
<br />
Technical and functi<strong>on</strong>al criteria<br />
Multi-technology criteria<br />
N<strong>on</strong>-technical and n<strong>on</strong>-functi<strong>on</strong>al criteria<br />
A high-level definiti<strong>on</strong> similar to the <strong>on</strong>e used within the URS document [AD-01] has been used in the<br />
descripti<strong>on</strong> <strong>of</strong> the criteria identified.<br />
Criteria definiti<strong>on</strong>, including a rati<strong>on</strong>ale and the traceability to the documentati<strong>on</strong> <strong>on</strong> which is based<br />
each criteri<strong>on</strong> is included in Annex §A.<br />
The tables below summarise the criteria to be applied to the proposed <strong>SATCOM</strong> soluti<strong>on</strong>s.<br />
Technical and functi<strong>on</strong>al criteria<br />
Criteri<strong>on</strong> ID<br />
CRT-TECH-1<br />
CRT-TECH-2<br />
CRT-TECH-3<br />
CRT-TECH-4<br />
CRT-TECH-5<br />
CRT-TECH-6<br />
CRT-TECH-7<br />
CRT-TECH-8<br />
CRT-TECH-9<br />
CRT-TECH-10<br />
Criteri<strong>on</strong><br />
The ―link availability‖ <strong>of</strong> the proposed <strong>SATCOM</strong> system shall be High.<br />
The ―reliability‖ <strong>of</strong> the proposed <strong>SATCOM</strong> system shall be High.<br />
The end-to-end error ratio <strong>of</strong> the proposed <strong>SATCOM</strong> system shall be Low.<br />
Note: Since this criteri<strong>on</strong> <strong>on</strong>ly c<strong>on</strong>siders the satellite system, the error ratio shall be measured<br />
after the last satellite communicati<strong>on</strong> layer (e.g. data link layer or L2)<br />
Transfer delay <strong>for</strong> the proposed satellite system shall be Low.<br />
Note: It refers to the end-to-end (<strong>on</strong>e-way) delay due to the satellite channel. There<strong>for</strong>e, it shall<br />
be measured from satellite transmitter to satellite receiver.<br />
Delay jitter <strong>of</strong> the proposed <strong>SATCOM</strong> system shall be Low.<br />
Note: Since this criteri<strong>on</strong> refers to the <strong>on</strong>e-way satellite channel jitter, it shall be measured from<br />
satellite transmitter to satellite receiver.<br />
Network registrati<strong>on</strong> delay <strong>for</strong> the proposed <strong>SATCOM</strong> system shall be Normal (with similar<br />
values <strong>of</strong> current GSM-R system).<br />
The call establishment delay <strong>for</strong> the proposed <strong>SATCOM</strong> system shall be Low.<br />
Note: as a first reference, GSM-R establishment delays can be c<strong>on</strong>sidered.<br />
The proposed <strong>SATCOM</strong> system shall allow (at least) the estimated number <strong>of</strong> European FRMCS<br />
users by 2030 registered simultaneously.<br />
The proposed <strong>SATCOM</strong> system shall provide priority and pre-empti<strong>on</strong> mechanisms.<br />
The proposed <strong>SATCOM</strong> system shall support Data and Voice services.<br />
Doc.Nº: SRAIL-FNR-010-IND<br />
Edit./Rev.: 1/1<br />
Date: 16/02/2017<br />
Page 61 <strong>of</strong> 285
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