ETCS/ERTMS系统原理：SUBSET-026-3 v300 版本3概述

ERA * UNISIG * EEIG ERTMS USERS GROUP

SUBSET-026-3

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Chapter 3

Principles

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c) If a mode change, not considered as an End of Mission, has to be reported to the

RBC (only if level 2 or 3)

d) If the driver has manually changed the level to 2 or 3

e) When communication session has been terminated because of a loss of safe radio

connection inside an announced radio hole, and the train front reaches the end of

this radio hole (refer to 3.5.4.4)

f) When the previous communication session is considered as terminated due to loss

of safe radio connection (refer to 3.5.4.2.1)

g) When a Start of Mission procedure, during which no communication session could

be established, is completed in level 2 or 3

3.5.3.5 The order to contact an RBC shall include

a) The identity of the RBC.

b) The telephone number of the RBC.

c) The action to be performed (establish/terminate the session).

d) Whether this applies also to Sleeping units.

3.5.3.5.1 See table at the end of section 3.5.3.

3.5.3.5.2 If the order to establish a communication session with an RBC is received and

accepted by ERTMS/ETCS on-board equipment already in session with another RBC,

the existing communication session shall be terminated (see 3.5.5.2 for details) and

the new one shall be established. Exception: an RBC/RBC Handover is engaged and

the order relates to the Accepting RBC.

3.5.3.5.3 The order to contact an Accepting RBC shall be part of the RBC transition order and

shall include:

a) The identity of the Accepting RBC.

b) The telephone number of the Accepting RBC.

c) Whether this applies also to Sleeping unit.

3.5.3.6 The order to contact a Radio In-fill Unit shall include

a) The identity of the Radio In-fill Unit

b) The telephone number of the Radio In-fill Unit

c) The action to be performed (establish/terminate the session).

3.5.3.7 If the establishment of a communication session is initiated by the on-board, it shall be

performed according to the following steps:

a) The on-board shall request the set-up of a safe radio connection with the trackside.

If this request is part of an on-going Start of Mission procedure, it shall be repeated

until successful or a defined number of times (see Appendix A3.1). The request

ERA * UNISIG * EEIG ERTMS USERS GROUP

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Chapter 3

Principles

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shall be repeated immediately after EURORADIO has indicated that setting up the

safe connection has failed. After the last unsuccessful attempt, the driver shall be

informed that no connection was set up.

If this request is not part of an on-going Start of Mission procedure, it shall be

repeated until at least one of the following conditions is met:

• Safe radio connection is set up

• End of Mission is performed

• Order to terminate communication session is received from trackside

• The train passes a level transition border (from level 2/3 to level 0, STM, 1) with

its front end.

• New order to establish communication session for a different RBC is received

from trackside and the order does not request to contact an Accepting RBC.

• The train passes a RBC/RBC border with its front end.

b) As soon as the safe radio connection is set-up, the on-board shall send the

message Initiation of communication session to the trackside.

c) As soon as the trackside receives the information, it shall send the system version.

3.5.3.8 When the on-board receives the system version it shall consider the communication

session established and:

a) If one of its supported system versions is compatible with the one sent by trackside,

it shall send a session established report, including its telephone numbers, to the

trackside.

b) If none of its supported system versions is compatible with the one sent by

trackside, it shall send a version independent message indicating “No compatible

version supported”. It shall inform the driver and then shall terminate the

communication session.

3.5.3.9 When the trackside receives the session established report or the information that no

compatible system version is supported by the on-board, it shall consider the

communication session established.

3.5.3.9.1 Intentionally deleted.

ERA * UNISIG * EEIG ERTMS USERS GROUP

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Chapter 3

Principles

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3.5.4 Maintaining a communication session

3.5.4.1 When a communication session is established, in case of a loss of the safe radio

connection, i.e., if the disconnection has not been ordered (see 3.5.5.1), the involved

entities shall consider the communication session still established for a defined time.

The defined time shall start as soon as EURORADIO has indicated the loss of the safe

radio connection.

3.5.4.2 When EURORADIO indicates the loss of the safe radio connection, the ERTMS/ETCS

on-board equipment shall immediately try to set-up a new safe radio connection.

3.5.4.2.1 If the safe radio connection is not re-established after the defined time (as defined in

A3.1), both, on-board equipment and trackside, shall consider the session as

terminated, and the ERTMS/ ETCS on-board equipment shall inform the driver.

3.5.4.3 The attempts shall be repeated, until at least one of the following conditions is met:

• The safe radio connection is set-up.

• The session is considered as terminated.

3.5.4.4 When the safe radio connection is lost inside an announced radio hole (see 3.12.1.3),

the on-board equipment shall try to re-establish the safe radio connection when the

train front reaches the end of the radio hole.

3.5.5 Terminating a communication session

3.5.5.1 The termination of a communication session shall be initiated only by the on-board and

in the following cases:

a) If an order is received from trackside (RBC or balise groups) (see section 3.5.3.5

concerning the content of the order).

b) If an error condition requiring the termination of the communication session is

detected on-board (e.g., not compatible system versions between on-board and

trackside). The driver shall be informed about the reason of the termination.

c) The train is rejected by RBC during Start of Mission.

d) If the driver closes the desk during Start of Mission.

e) In case a train exits from the RBC area and no order to terminate the session is

received, the on-board equipment shall cyclically send a position report. After a

defined number of times (see Appendix A3.1) the on-board equipment shall

terminate the communication session and send an error message to the driver.

f) In case of communication session with an RIU: the Level 1 is left, or, an End of

Mission is executed.

3.5.5.2 In case a session is established, the on-board equipment shall terminate the

communication session according to the following steps:

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ETCS/ERTMS系统原理：SUBSET-026-3 v300 版本3概述

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