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M66-DS DSDS

Application Note

GSM/GPRS Module Series

Rev. M66-DS_DSDS_Application_Note_V1.0

Date: 2016-04-05

www.quectel.com

GSM/GPRS Module Series M66-DS DSDS Application Note

M66-DS_DSDS_Application_Note Confidential / Released 1 / 23

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mailto:[email protected]

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About the Document

History

Revision Date Author Description

1.0 2016-04-05 Thomas ZHANG Initial

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Contents

About the Document ................................................................................................................................... 2

Contents ....................................................................................................................................................... 3

Table Index ................................................................................................................................................... 4

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

2 Rules of DSDS Command and URC ................................................................................................... 6

3 Examples of Common Procedures .................................................................................................... 7

3.1. Initialization after Power on ..................................................................................................... 7

3.2. Make a Voice Call .................................................................................................................... 8

3.3. Accept a Voice Call ................................................................................................................. 9

3.4. Attach GPRS ......................................................................................................................... 11

3.5. PPP Dialup ............................................................................................................................ 12

3.6. Establish TCP Connection..................................................................................................... 13

4 DSDS Commands Description ......................................................................................................... 16

4.1. AT Command Syntax ............................................................................................................. 16

4.2. Select the SIM Card .............................................................................................................. 16

4.2.1. AT+QDSEL Select the SIM Card ................................................................................. 16

4.3. Set/Query the Properties of the Dual SIMs ........................................................................... 17

4.3.1. AT+QDSIMEI Set the IMEI for Dual SIMs ................................................................... 17

4.3.2. AT+QDSQ Query the Signal Quality of Dual SIMs ..................................................... 18

4.3.3. AT+QDSREG Query the Network Registration Status of Dual SIMs .......................... 19

4.3.4. AT+QDSGREG Query the GPRS Status of Dual SIMs .............................................. 20

5 URC ...................................................................................................................................................... 21

6 Appendix A References ..................................................................................................................... 23

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Table Index

TABLE 1: EXAMPLES OF AT COMMANDS ................................................................................................ 7

TABLE 2: URC LIST ................................................................................................................................... 21

TABLE 3: TERMS AND ABBREVIATIONS ................................................................................................ 23

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1 Introduction

This document mainly introduces how to use the Dual SIM Dual Standby (DSDS) function of Quectel

M66-DS module.

M66-DS can be connected to two SIM cards simultaneously, and perform Location Update for them.

Working with two protocol stacks, the module can monitor the paging and do Cell Reselection

independently for the two SIMs. However, as the module has only one RF channel, any of these two SIMs

but only one of them can attach GPRS or stay in dedicated state for voice call or GPRS transferring. For

example, if the module is ringing from one SIM, the other will be disabled from making a MO or MT call; if

one SIM has already activated the PDP, the PDP activation request from the other SIM will be rejected.

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2 Rules of DSDS Command and URC

The general rules of DSDS commands and URCs are illustrated below:

For URCs:

SIM1 uses the standard URC string, while SIM2 comes with a suffix “DS”. For example, “RING”

indicates SIM1 is ringing, while “RING DS” indicates SIM2 is ringing. Please refer to Chapter 5 for

detailed URCs.

For AT commands:

For most AT commands, the two SIMs share the same format. After using AT+QDESL command to

specify a SIM, subsequent commands will be applied for the specified SIM only.

Example

AT+QDSEL=1

OK

AT+CPIN?

+CPIN: READY

OK

AT+QDSEL=2

OK

AT+CPIN?

+CPIN: READY //Note: It‟s not +CPINDS:

OK

Some commonly used AT commands also have their dual-SIM version, so as to query the properties

of both SIMs. These commands can be executed on any of the SIM context. AT+QDSQ,

AT+QDSREG, and AT+QDSGREG commands are some of the examples.

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3 Examples of Common Procedures

This chapter will describe how the module initializes the dual SIMs after power on and how to perform

some common procedures with the dual SIM cards, such as making a voice call, accepting a voice call,

GPRS attachment, PPP dialup and TCP connecting. In general, the target SIM card needs to be chosen

first before these procedures are performed. The command AT+QDSEL is used to select which SIM will

be used to perform these actions.

The following is an example list of the AT commands. For more details, please refer to Chapter 4.

Table 1: Examples of AT Commands

3.1. Initialization after Power on

After power on, the module will detect both SIM cards and initialize them if they are inserted. After the two

SIMs are initialized, the module will automatically register the network. Only SIM1 will attach the GPRS

automatically if both cards are inserted. When only SIM2 is inserted, SIM2 will also attach the GPRS

automatically. Some of the initialization URC will output in this stage.

RDY

+CFUN: 1 // Phone functionality status report based on SIM1 protocol stack

+CPIN: READY // SIM1 Ready

+CFUNDS: 1 // Phone functionality status report based on SIM2 protocol stack

AT Commands Description

AT+QDSEL Choose which SIM to be operated. All the following commands will target to

the selected SIM and protocol stack.

AT+QDSQ DS version of AT+CSQ. Query the signal quality of the two networks.

AT+QDSREG DS version of AT+CREG. Query the CS registration state of the two SIMs.

AT+QDSGREG DS version of AT+CGREG. Query the GPRS state of the two SIMs. Quectel

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+CPINDS: READY // SIM2 Ready

Call Ready // SIM1‟s phonebook has been initialized

Call Ready DS // SIM2‟s phonebook has been initialized

SMS Ready // SIM1‟s SMS has been initialized

SMS Ready DS // SIM2‟s SMS has been initialized

AT+QDSREG?

+QDSREG: 1,0,1 // Query the registration status. Both are registered.

+QDSREG: 2,0,1

OK

AT+QDSGREG?

+QDSGREG: 1,0,1 // Query the GPRS status. Only SIM1 is auto attached.

+QDSGREG: 2,0,0

OK

3.2. Make a Voice Call

Call Ready

Call Ready DS

AT+QDSEL?

+QDSEL: 1,1,1

OK

AT+QDSREG?

+QDSREG: 1,0,1

+QDSREG: 2,0,2

OK

AT+QDSREG?

+QDSREG: 1,0,1

+QDSREG: 2,0,1 // Both are registered.

OK

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AT+QDSQ

+QDSQ: 1,26,0

+QDSQ: 2,26,0

OK

ATD10086; // Dial with SIM1

OK

AT+CLCC

+CLCC: 1,0,0,0,0,"10086",129,""

OK

ATH

OK

AT+QDSEL=2 // Select SIM2

OK

AT+QDSEL?

+QDSEL: 2,1,1

OK

ATD10086; // Dial with SIM2

OK

AT+CLCC

+CLCC: 1,0,0,0,0,"10086",129,""

OK

ATH

OK

3.3. Accept a Voice Call

AT+QDSEL?

+QDSEL: 1,1,1 // In SIM 1 context

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OK

RING DS // Incoming call from SIM2

RING DS

ATA

+CME ERROR: 3 // Will fail if accept in SIM1 context

RING DS

AT+QDSEL=2 // Select to operate on SIM2 context

OK

RING DS

ATA // Accept the call

OK

AT+CLCC

+CLCC: 1,1,0,0,0,"18955125763",129,""

OK

NO CARRIER DS // Hung up by remote

AT+QDSEL=1

OK

AT+QDSEL?

+QDSEL: 1,1,1

OK

RING // Incoming call from SIM 1

RING

ATA

OK

AT+CLCC

+CLCC: 1,1,0,0,0,"18955125763",129,""

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OK

NO CARRIER // SIM1‟s call is hung up by remote

3.4. Attach GPRS

AT+QDSEL?

+QDSEL: 1,1,1

OK

AT+QDSGREG?

+QDSGREG: 1,0,1 // SIM1 is GPRS attached; SIM2 is detached.

+QDSGREG: 2,0,0

OK

AT+CGATT?

+CGATT: 1 // SIM1 context. CGATT is 1.

OK

AT+QDSEL=2 // Select SIM2

OK

AT+CGATT?

+CGATT: 0

OK

AT+CGATT=1

+CME ERROR: 100 // Failed because SIM1 is already attached. Only one is allowed to be attached.

AT+QDSEL=1 // Select SIM1 to detach first

OK

AT+CGATT=0 // Must detach first. Only one SIM can be attached.

OK

AT+CGATT?

+CGATT: 0

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OK

AT+QDSGREG?

+QDSGREG: 1,0,0

+QDSGREG: 2,0,0

OK

AT+QDSEL=2 // Select SIM2 and attach

OK

AT+CGATT=1

OK

AT+CGATT?

+CGATT: 1

OK

AT+QDSGREG?

+QDSGREG: 1,0,0

+QDSGREG: 2,0,1

OK

3.5. PPP Dialup

// Take SIM1 for example. Now SIM2 is attached. First detach it; then attach SIM1; and finally dial up PPP.

AT+QDSGREG?

+QDSGREG: 1,0,0

+QDSGREG: 2,0,1

OK

AT+QDSEL=2

OK

AT+CGATT=0

OK

AT+QDSEL=1

OK

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AT+CGATT=1

OK

AT+CGATT?

+CGATT: 1

OK

// Can continue the PPP dialup process …

3.6. Establish TCP Connection

AT+QDSEL?

+QDSEL: 1,1,1

OK

AT+QDSGREG?

+QDSGREG: 1,0,1 // SIM1 is GPRS attached; SIM2 is detached.

+QDSGREG: 2,0,0

OK

AT+CGATT?


OK

AT+QIREGAPP

OK

AT+QIACT

OK

AT+QIOPEN=”TCP”,”220.180.239.201”,8047

OK

CONNECT OK

AT+QISEND //Send data to the remote server

>0123456789 // „>‟ from the UART indicates the following input data is considered as the data to

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be sent. After receiving „>‟, input data (“0123456789”)

<Ctrl+Z> //After data input, use <Ctrl+Z> to send the data

SEND OK //SEND OK means the data has been sent.

AT+QISACK

+QISACK: 11,11,0

OK

AT+QICLOSE

CLOSE OK //Close the SIM1 TCP connection, and then detach it.

AT+QIDEACT

DEACT OK

AT+CGATT=0

OK

AT+QDSEL=2 // Select SIM2 and attach

OK

AT+CGATT=1

OK

AT+CGATT?


OK

AT+QDSGREG?

+QDSGREG: 1,0,0

+QDSGREG: 2,0,1 // SIM1 is GPRS detached; SIM2 is attached.

OK

AT+QIREGAPP

OK

AT+QIACT

OK

AT+QIOPEN=”TCP”,”220.180.239.201”,8047

OK

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CONNECT OK

AT+QISEND //Send data to the remote server

>9876543210 // „>‟ from the UART indicates the following input data is considered as the data to

be sent. After receiving „>‟, input data (“9876543210”)

<Ctrl+Z> //After data input, use <Ctrl+Z> to send the data

SEND OK //SEND OK means the data has been sent.

AT+QISACK

+QISACK: 11,11,0

OK

AT+QICLOSE

CLOSE OK //Close the SIM2 TCP connection, and then detach it.

AT+QIDEACT

DEACT OK

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4 DSDS Commands Description

4.1. AT Command Syntax

4.2. Select the SIM Card

If one action is targeted to a specific SIM, the module needs switching to this SIM first. Command

AT+QDSEL can be used for SIM card selection. Details are illustrated below.

4.2.1. AT+QDSEL Select the SIM Card

AT+QDSEL is used to specify which SIM the subsequent commands will apply to.

Test Command AT+<x>=? This command returns the list of parameters and value ranges

set by the corresponding Write Command or internal processes.

Read Command AT+<x>? This command returns the currently set value of the parameter

or parameters.

Write Command AT+<x>=<…> This command sets the user-definable parameter values.

Execution

Command AT+<x>

This command reads non-variable parameters affected by

internal processes in the GSM engine.

AT+QDSEL Select the SIM Card

Test Command

AT+QDSEL=?

Response

+QDSEL: (list of supported <sim>s)

OK

Read Command

AT+QDSEL?

Response

+QDSEL: <sim>,<sim1_status>,<sim2_status>

OK

Write Command

AT+QDSEL=<sim>

Response

OK

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Parameter

4.3. Set/Query the Properties of the Dual SIMs

Quectel provides some AT commands to set or query some common properties of dual SIMs easily,

without the need of switching between them.

4.3.1. AT+QDSIMEI Set the IMEI for Dual SIMs

AT+QDSIMEI is used to set the individual IMEI for each SIM. By default, both IMEIs are written into the

module from factory. It is suggested not to change the default IMEI unless it is necessary.

Reference

<sim> Which SIM card

1 SIM slot 1

2 SIM slot 2

<sim1_status> SIM1 status

0 Not inserted

1 Inserted.

<sim2_status> SIM2 status

0 Not inserted

1 Inserted.

<sim> number is identified by hardware SIM slot number.

AT+QDSIMEI Set the IMEI for Dual SIMs

Test Command

AT+QDSIMEI=?

Response

+QDSIMEI: (list of supported <sim>s),“imei”

OK

Read Command

AT+QDSIMEI?

Response

+QDSIMEI: <sim>,“imei1”

+QDSIMEI: <sim>,“imei2”

OK

NOTE

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Parameter

The input IMEI must be valid. Refer to GSM 02.16 for the IMEI validation check.

4.3.2. AT+QDSQ Query the Signal Quality of Dual SIMs

AT+QDSQ is used to query the signal quality of dual SIM cards.

Parameter

Write Command

AT+QDSIMEI =<sim>,”imei”

Response

OK

Reference

<sim> SIM card number

1 SIM1

2 SIM2

“imei” IMEI string

“imei1” IMEI for SIM1 protocol stack

“imei2” IMEI for SIM2 protocol stack

AT+QDSQ Query the Signal Quality of Dual SIMs

Test Command

AT+QDSQ=?

Response

OK

Execute Command

AT+QDSQ

Response

+QDSQ: <sim>,<rssi1>,<ber1>

+QDSQ: <sim>,<rssi2>,<ber2>

OK

Reference


1 SIM1

NOTE

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4.3.3. AT+QDSREG Query the Network Registration Status of Dual SIMs

AT+QDSREG is used to query the network registration status of dual SIM cards.

Parameter

2 SIM2

<rssi1>,<rssi2> Signal strength for both protocols

0 113 dBm or less

1 111 dBm

2...30 109... 53 dBm

31 51 dBm or greater

99 Not known or not detectable

<ber1>,<ber2> Bit error rate for both protocols (in percent):

0...7 As RXQUAL values in the table in GSM 05.08 subclause 8.2.4

99 Not known or not detectable

AT+QDSREG Query the Network Registration Status of Dual SIMs

Test Command

AT+QDSREG=?

Response

OK

Read Command

AT+QDSREG?

Response

+QDSREG: <sim>,<n>,<stat>[,<lac>,<ci>]

+QDSREG: <sim>,<n>,<stat>[,<lac>,<ci>]

OK

Reference

<sim> 1 Status of SIM1

2 Status of SIM2

<n> 0 Disable network registration unsolicited result code

1 Enable network registration unsolicited result code

2 Enable network registration unsolicited result code with location information

<stat> 0 Not registered, ME is not currently searching a new operator to register to

1 Registered, home network

2 Not registered, but ME is currently searching a new operator to register to

3 Registration denied

4 Unknown

5 Registered, roaming

<lac> String type; two byte location area code in hexadecimal format

<ci> String type; two byte cell ID in hexadecimal format

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4.3.4. AT+QDSGREG Query the GPRS Status of Dual SIMs

AT+QDSGREG is used to query the GPRS status of dual SIM cards.

Parameter

AT+QDSGREG Query the GPRS Status of Dual SIMs

Test Command

AT+QDSGREG=?

Response

OK

Read Command

AT+QDSGREG?

Response

+QDSGREG: <sim>,<n>,<stat>[,<lac>,<ci>]

+QDSGREG: <sim>,<n>,<stat>[,<lac>,<ci>]

OK

Reference


1 Query SIM1

2 Query SIM2

<n> 0 Disable network registration unsolicited result code

1 Enable network registration unsolicited result code

2 Enable network registration and location information unsolicited result code

<stat> 0 Not registered, ME is not currently searching a new operator to register to

1 Registered, home network

2 Not registered, but ME is currently searching a new operator to register to

3 Registration denied

4 Unknown

5 Registered, roaming

<lac> String type; two byte location area code in hexadecimal format (e.g. "00C3" equals 195 in

decimal)

<ci> String type; two bytes cell ID in hexadecimal format

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5 URC

“DS” is suffixed on the URC to indicate that it‟s for SIM2. The URCs are listed in the following table.

Table 2: URC List

Category SIM 1 URC SIM 2 URC Meaning

SIM

+CFUN: +CFUNDS: Phone functionality status report

Call Ready Call Ready DS PHB is ready

+CPIN: +CPINDS: SIM card pin state

SMS Ready SMS Ready DS SMS is initialized

SMS

+CDS: +CDSDS: SMS delivery status report is received and

output directly

+CMTI: +CMTIDS: New message is received, and saved to

memory

+CMT: +CMTDS: New short message is received and output

directly to TE

Network

+CREG: +CREGDS: Indicate registration status of the ME

+CGREG: +CGREGDS: Network registered

+CSQN: +CSQNDS: Signal quality change

Call

+QGURC: +QGURCDS: Unsolicited result code follows particular call

state transition

RING RING DS Indicates an incoming call

BUSY BUSY DS Busy

NO ANSWER NO ANSWER DS No answer

NO CARRIER NO CARRIER DS Call is hung up

NO DIALTONE NO DIALTONE DS No dial tone

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+COLP: +COLPDS: The presentation of the COL (connected

line) at the TE for a mobile originated call

+CLIP: +CLIPDS: Mobile terminating call indication

+CRING: +CRINGDS:

An incoming call is indicated to the TE with

unsolicited result code instead of the normal

RING

+CCWA: +CCWADS: Call waiting indication

MO RING MO RING DS MO call ringing

MO

CONNECTED MO CONNECTED DS MO call connected

STK +STKPCI: +STKPCIDS: STK data notification

NITZ +QNITZ: +QNITZDS: NITZ notification

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6 Appendix A References

Table 3: Terms and Abbreviations

Abbreviation Description

DSDS Dual SIM Dual Standby

DS Dual SIM

GPRS General Packet Radio Service

ME Mobile Equipment

MO Mobile Originated

MS Mobile Station

MT Mobile Terminated

NITZ Network Identity and Time Zone

PDP Packet Data Protocol

PHB Phonebook

PPP Point to Point Protocol

SIM Subscriber Identity Module

STK SIM Tool Kit

TCP Transmission Control Protocol

TE Terminal Equipment

UART Universal Asynchronous Receiver/Transmitter

URC Unsolicited Result Code

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