欧洲无线电系统接口规范SUBSET-037 v3.2.0

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SUBSET-037

v3.2.0

EuroRadio FIS

Page 16/126

4 REFERENCE ARCHITECTURE

4.1.1.1 EN 50159 defines the reference architecture for safety-related systems using open

transmission systems. The general structure of a safety-related system such as the

European Train Control System (Figure 1) is derived from EN 50159.

4.1.1.2 In addition to safety-related information, application processes in the safety-related

equipment can exchange non-safety related information with remote application

processes using the services of the radio communication system.

Application

Process

Safety-Related

Equipment

Safety-Related

Transmission

System

(Open)

Communication

System

(Open)

Communication

System

Application

Process

Safety-Related

Equipment

Safety-Related

Transmission

System

Safety-Related

Message

Safety-Related

Information

Protocol Data

Unit

GSM / ISDN or PDN

Figure 1 Structure of the radio communication system

4.1.1.3 For the purposes of this FIS, the open transmission system of EN 50159 is divided into

components: the Communication System and the Open Network. The open (public or

railway owned) network is out of scope for this part of the FIS. Only the service features

requested at the interface to the network are covered.

4.1.1.4 The Safety Functional Module (SFM) of the RCS provides the functions of the safety-

related transmission system. The Communication Functional Module (CFM) of the RCS

provides the functions of the communication system based on circuit-switched/packet-

switched bearer services of the GSM-R/GPRS. Figure 2 contains a detailed reference

architecture of the radio communication sub-system. The service interfaces and the

protocol interfaces are defined.

4.1.1.5 In Figure 2 the Interface 1 is an interface between the RCS and the chosen transmission

medium. It consists of a user plane for transfer of user data and a control plane for

SUBSET-037

v3.2.0

EuroRadio FIS

Page 20/126

5 INTERFACE TO SAFE SERVICES

5.1 General

5.1.1.1 The safe services provided by the SFM are accessed by means of safe service primitives

with their corresponding parameters at the SaSAP. The safe service primitives are similar

to the service primitives defined in [ITU-T X.214] for connection mode service.

5.1.1.2 The interface is mandatory at functional level only.

5.1.1.3 Note: It is a matter of implementation to adapt this interface to implementation needs and

constraints, which do not require any exchange on the air gap and have no impact on the

behaviour of the system.

5.1.1.4 Two different types of service primitives are specified:

a) service primitives for safe services

b) service primitives for interworking with the mobile network

5.1.1.5 The service primitives for safe services allow the set-up, disconnection of the connection

and the safe data transfer.

5.1.1.6 The service primitives for interworking with the mobile network apply to the on-boards

only. The service primitives are not safety relevant and have no impact on the safety

protocol. They allow the registration to the network and to check the permitted mobile

networks for ETCS. These service primitives are applicable if no safe connection exists.

5.2 Service primitives for safe connection set-up

5.2.1.1 The safe connection set-up service is based on the use of the following primitives:

Table 1 Service primitives of the safety layer for connection set-up

SaS-Primitive

Parameter

Sa-CONNECT.

request

Sa-CONNECT.

indication

Sa-CONNECT.

response

Sa-CONNECT.

confirm

SaCEPID

X(=)

Called address

 Address type

 Network address

 Mobile Network ID

 Called ETCSID type

 Called ETCS ID

X(D)

X(U)

Calling address

 Calling ETCS ID type

 Calling ETCS ID

X(D)

X(=)

Responding address

 Responding ETCS ID

type

 Responding ETCS ID

X(D)

X(=)

Application type

X(=)

Quality of service class

X(D)

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