GSM eCall Application Note€¦ · (BTS ) S pe e c h Tra ns - c o ding (TRAU) Mo bile S witc hing...

GSM Quectel Cellular Engine

GSM eCall

Application Note GSM_eCALL_Application_Note_V1.1

GSM eCall Application Note

GSM_eCall_Application_Note_V1.1 - 1 -

Document Title: GSM eCall Application Note

Revision: 1.1

Date: 2012-04-06

Status: Released

Document Control ID GSM_eCall_Application_Note_V1.1

General Notes

Quectel offers this information as a service to its customers, to support application and

engineering efforts that use the products designed by Quectel. The information provided is based

upon requirements specifically provided for customers of Quectel. Quectel has not undertaken any

independent search for additional information, relevant to any information that may be in the

customer’s possession. Furthermore, system validation of this product designed by Quectel within

a larger electronic system remains the responsibility of the customer or the customer’s system

integrator. All specifications supplied herein are subject to change.

Copyright

This document contains proprietary technical information of Quectel Co., Ltd. Copying this

document, distribution to others, and communication of the contents thereof, are forbidden without

permission. Offenders are liable to the payment of damages. All rights are reserved in the event of

a patent grant or registration of a utility model or design. All specifications supplied herein are

subject to change without notice at any time.

Copyright © Quectel Wireless Solutions Co., Ltd. 2012.

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Contents

Contents ............................................................................................................................................ 2

Figure Index ...................................................................................................................................... 3

0. Revision history ............................................................................................................................ 4

1. Introduction ................................................................................................................................... 5

1.1. Reference ............................................................................................................................. 5

1.2. Abbreviations ...................................................................................................................... 5

1.3. eCall overview and architecture .......................................................................................... 5

2. eCall procedure ............................................................................................................................. 7

2.1. Pull mode ............................................................................................................................ 7

2.2. Push mode ........................................................................................................................... 8

2.3. Call release .......................................................................................................................... 9

2.4. Test procedure ..................................................................................................................... 9

3. eCall commands description ....................................................................................................... 12

3.1. AT%EMSD Set DSP to monitor incoming data ............................................................. 12

3.2. AT%EMSDSET Set MSD data ...................................................................................... 12

3.3. AT+CECALL Establish eCall ......................................................................................... 13

3.4. AT%EMSDPUSH Push MSD data to PSAP .................................................................. 13

3.5. AT%EMSDMOD Set eCall mode .................................................................................. 14

3.6. AT%EMSDTNUM Set Test number .............................................................................. 15

3.7. AT%EMSDRNUM Set reconfigured eCall number ....................................................... 15

3.8. AT%EPSAP Set PSAP simulating mode ........................................................................ 16

3.9. AT%EPSAPPULL PSAP pull MSD from IVS, only for simulating .............................. 17

4. Summary of URC ........................................................................................................................ 18

4.1. Summary of URC .............................................................................................................. 18

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Figure Index

FIGURE 1: ECALL SYSTEM OVERVIEW ........................................................................................... 6

FIGURE 2: ECALL SYSTEM ARCHITECTURE .................................................................................. 6

FIGURE 3: PULL MODE ........................................................................................................................ 7

FIGURE 4: PUSH MODE ........................................................................................................................ 8

FIGURE 5: ECALL RELEASE ............................................................................................................... 9

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0. Revision history

Revision Date Author Description of change

1.0 2012-02-22 Laguna XU Initial

1.1 2012-03-28 Thomas

ZHANG

1. Restructured the document

2. Added eCall introduction and eCall test

steps

3. Added AT commands for PSAP

simulation

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1. Introduction

This document mainly introduces how to use the eCall function of Quectel standard module.

eCall function is only supported by the special software version.

1.1. Reference

Table 1: Reference

SN Document name Remark

[1] Mxx_ATC Mxx AT commands set

[2] 3GPP TS 26.267 eCall Data Transfer; In-band modem solution; General

description

[3] 3GPP TS 22.101 Service aspects; Service principles.

1.2. Abbreviations

Terms Description

ACK Acknowledgement

DTE Data Terminal Equipment

IVS In-Vehicle System

MSD Minimum Set of Data

PSAP Public Safety Answering Point

URC Unsolicited Response Code

ATM Set monitor speaker mode

1.3. eCall overview and architecture

eCall is defined as a manually or automatically initiated emergency call (TS12) from a vehicle,

supplemented with a minimum set of emergency related data (MSD), as defined under the EU

Commission’s eSafety initiative.

It can be depicted by the figure below.

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Figure 1: eCall System Overview

The architecture is described in Figure 2. In Quectel test system, the module has the ability to act

as IVS and also to simulate the PSAP. Thus, we could prepare two modules to perform the eCall

testing.

IVS

Data

modem

Speech

Codec

MSD

information

source

Microphone &

Speakers

Radio

Modem

Public-Safety Answering Point (PSAP)

PSAP

Data

Modem

MSD

Display

Microphone &

Speakers

In-Vehicle System (IVS)

GPS

Receiver

position data

PSTN/GSTN

Radio

Modem

(BTS)

Speech

Trans-

coding

(TRAU)

Mobile

Switching

Center

(MSC)

PLMN

Figure 2: eCall System Architecture

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2. eCall procedure

The whole eCall procedure contains Pull Mode, Push Mode and Call Release. The following

figures show the detailed procedure of each mode.

2.1. Pull mode

DTE Modem

AT%EMSD=1 (Start monitor )

No call exist

AT%EMSDSET=…(Put MSD to DSP )

First time starts, always put

MSD before making eCall

AT+CECALL (Make eCall )After connect, DSP

speech on

This URC requires MSD

data update

+ESPEECH (Speech on )

+EMSDPULL (URC, require MSD )

+EMSDHACK (MSD, sent ack )

MSD set complete

Figure 3: Pull mode

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2.2. Push mode

DTE Modem

AT%EMSD=1 (Start monitor )

No call exist

AT%EMSDSET=…(Put MSD to DSP )

First time starts, always

put MSD before making

eCall

AT+CECALL (Make eCall )After connect, DSP

speech on

Should put MSD

before PUSH

+ESPEECH (Speech on )

AT%EMSDPUSH (Push MSD to PSAP)

OK

+EMSDHACK ( MSD sent success or

fail)

Figure 4: Push mode

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2.3. Call release

DTE Modem

ATH (Release all call )

eCall exist

AT%EMSD=0 Close DSP monitor

Figure 5: eCall release

2.4. Test procedure

2.4.1. Commands to be used during the test

AT commands maybe used in IVS side including:

AT%EMSD // Turn on/off the function of DSP monitoring MSD

data

AT%EMSDSET //Set MSD data (GPS address …)

AT+CECALL // Establish eCall (After call connects, speech on)

AT%EMSDPUSH // IVS pushes MSD to PSAP

ATH //Release call

AT%EMSDTNUM //Set test number

AT%EMSDRNUM //Set reconfiguration number

URC reports include:

+EMSDPULL // PSAP starts getting pull data

+EMSDSYNC // SYNC frame is detected, start sending MSD

+EMSDLACK // Link layer data transfer succeeds

+EMSDHACK //High layer data ACK, which will be sent to AP no

matter MSD transfer succeeds or fails.

To support eCall test, we add several commands so that the module can simulate PSAP.

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AT commands maybe used in PASP simulator side including:

AT%EPSAP //Turn on/off PSAP simulating mode

AT%EPSAPPULL //PSAP pulls data from IVS

URC report includes:

+EPSAPIND //MSD is received in PSAP simulator side

Please refer to Chapter 3 for the detailed information of these AT commands.

2.4.2. Test steps

1. Prepare two Quectel M80 modules, download the same eCall firmware to the two modules

then reset them.

2. Insert SIM card and make sure the two modules have registered the network and can dial or

accept the call.

3. Select one module as IVS, the other simulates PSAP. We will call them M_IVS and M_PSAP

in this document.

4. Set DSP monitoring mode and MSD data.

On the M_IVS, execute AT commands:

AT+EMSD=1 //Turn on DSP monitoring MSD

AT+EMSDSET=”0d0d0d” // Set the MSD, hex bytes. This data is just an

example. Max data length is 140 bytes.

On the M_PSAP, execute AT commands:

AT+EPSAP=1 //Turn on PSAP simulation mode

5. Establish eCall.

On the M_IVS, execute AT commands:

AT%EMSDTNUM=13888888888 // Set test number of PSAP. Use the actual number of

M_PSAP.

AT+CECALL=0 // 0 means testing the call

Now, M_PSAP should ring. Accept the call via ATA.

6. Test Pull mode.

On the M_PSAP, execute AT commands:

AT%EPSPPULL

[Expected result]: regular noise should be heard on the two modules, and +EPSAPIND should be

reported to the UART. The valid data received should be same as that set in M_IVS.

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For example:

+EPSAPIND :00D0D0D00000000000000000000000000000000000000000000000000000000000

0000000000000000000000000000000000000000000000000000000000000000000000000000000

0000000000000000000000000000000000000000000000000000000000000000000000000000000

00000000000000000000000000000000000000000000000000000000

On the M_IVS side, the following URC will be reported:

+EMSDPULL

+EMSDSYNC

+EMSDSYNC

+EMSDSYNC

+EMSDHACK:1

7. Test Push mode.

On M_IVS, execute commands:

AT%EMSDPUSH // Push MSD to PSAP

[Expected Result] Same as the pull mode

8. End test.

Release call, turn off DSP monitoring MSD.

ATH //Release all calls

On M_IVS,

AT%EMSD=0 //Turn off DSP monitoring MSD

On M_PSAP

AT%EPSAP=0 //Turn off PSAP simulating

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3. eCall commands description

3.1. AT%EMSD Set DSP to monitor incoming data

AT%EMSD Set DSP to monitor incoming data

Test Command

AT%EMSD=?

Response:

%EMSD: (0-1)

OK

Read Command

AT%EMSD?

Not supported.

Write Command

AT%EMSD=<Monit

or_dsp>

Response

OK

If error is related to ME functionality:

+CME ERROR: <err>

Remark:

Limitation: must no call exist. Customer shall release all call first.

Parameter

<Monitor_dsp> :

0 DSP stops monitoring “eCall related signal” in

speech signal.

1 DSP starts to monitor “eCcall related signal”.

3.2. AT%EMSDSET Set MSD data

AT%EMSDSET Set MSD data

Test Command

AT%EMSDSET=?

Response:

OK

Read Command

AT%EMSDSET?

Not supported.

Write Command

AT%EMSDSET=<

MSD data>

Response

OK

Parameter

<MSD data> :MSD data should be hex bytes written in string format,

E.g.: AT%EMSDSET=”0D0D0D0D…”,

280 characters in total including quotes.

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3.3. AT+CECALL Establish eCall

AT+CECALL Establish eCall

Test Command

AT+CECALL=?

Response:

+CEALL: (0,1,2,3)

OK

Read Command

AT+CECALL?

Response:

+CECALL:[<type_of_call>]

OK

Write Command

AT+CECALL=<Typ

e_of_call>

Response.

OK

After call context, speech on:

+ESPEECH


+CME ERROR: <err>

Parameter

<Type_of_call> :

0 Test call

1 Reconfiguration call

2 Manually initiated eCall.

3 Automatically initiated eCall.

3.4. AT%EMSDPUSH Push MSD data to PSAP

AT%EMSDPUSH Push MSD data to PSAP

Test Command

AT%EMSDPUSH=?

Response:

OK

Read Command

AT%EMSDPUSH?

Not Supported

Write Command

AT%EMSDPUSH

Response.

OK


+CME ERROR: <err>

Parameter

None

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3.5. AT%EMSDMOD Set eCall mode

AT%EMSDMOD Set eCall mode

Test Command

AT%EMSDMOD =?

Response:

%EMSDMOD: (0-2)

OK

Read Command

AT%EMSDMOD?

Not Supported

Write Command

AT%

EMSDMOD=<MSD

MOD>

Response.

OK


+CME ERROR: <err>

Parameter

<MSDMOD>

0 SIM_ECALL_NONE

1 SIM_ECALL_ONLY

2 SIM_ECALL_AND_NORMAL

3 SIM_ECALL_TEST_DISABLE

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3.6. AT%EMSDTNUM Set Test number

AT%EMSDTNUM Set Test number

Test Command

AT%EMSDTNUM

=?

Response:

OK

Read Command

AT%EMSDTNUM?

Not Supported

Write Command

AT%EMSDTNUM=

<Testnum>

Response.

OK


+CME ERROR: <err>

Parameter

<Testnum> Test number user want to use

AT%EMSDTNUM

Response.

OK


+CME ERROR: <err>

Parameter

None.

Note:

Sending this command without parameter is used for clearing test

number. If SIM profile is available, use SIM profile number, otherwise

you cannot make test call.

3.7. AT%EMSDRNUM Set reconfigured eCall number

AT%EMSDRNUM Set reconfigured eCall number

Test Command

AT%EMSDRNUM

=?

Response:

OK

Read Command

AT%EMSDRNUM?

Not Supported

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Write Command

AT%EMSDRNUM

=<Reconfigure num>

Response.

OK


+CME ERROR: <err>

Parameter

<Reconfigure num> Reconfigure number user want to use

AT%EMSDRNUM

Response.

OK


+CME ERROR: <err>

Parameter

None.

Note:

Sending this command without parameter is used for clearing

reconfiguration number. If SIM profile is available, use SIM profile

number, otherwise you cannot make reconfigured eCall.

3.8. AT%EPSAP Set PSAP simulating mode

AT%EPSAP Set PSAP simulating mode

Test Command

AT%EPSAP =?

Response:

OK

Read Command

AT%EPSAP?

Not Supported

Write Command

AT%

EPSAP=<mode>

Response.

OK


+CME ERROR: <err>

Parameter

<mode>

0 Turn off PSAP simulating mode

1 Turn on PSAP simulating mode

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3.9. AT%EPSAPPULL PSAP pull MSD from IVS, only for simulating

AT%EPSAPPULL PSAP pulls MSD from IVS

Test Command

AT%EPSAPPULL

=?

Response:

OK

Read Command

AT%EPSAPPULL?

Not Supported

Write Command

AT% EPSAPPULL

Response.

OK


+CME ERROR: <err>

Parameter

None

Note:

Only applied when PSAP simulating mode is turned on.

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4. Summary of URC

4.1. Summary of URC

Index URC display Meaning Condition

1 +EMSDPULL PSAP start getting pull data

2 +EMSDSYNC SYNC frame is detected, start

sending MSD

3 +EMSDLACK Link layer data transfer succeeds

Only sent when

low layer transfer

succeeds

4 +EMSDHACK High layer data ACK. It will show

MSD transfer succeeds or fails.

Only sent after

PULL action.

5 +EPSAPIND:<MSD

data> The MSD data is received by PSAP

Pull or Push

mode

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Shanghai Quectel Wireless Solutions Co., Ltd.

Room 501, Building 13，No.99 Tianzhou Road, Shanghai, China 200233

Tel: +86 21 5108 6236

Mail: [email protected]

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GSM eCall Application Note€¦ · (BTS ) S pe e c h Tra ns - c o ding (TRAU) Mo bile S witc hing...

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Transcript of GSM eCall Application Note€¦ · (BTS ) S pe e c h Tra ns - c o ding (TRAU) Mo bile S witc hing...