Quectel WCDMA Instructions d'installation et d'utilisation

WCDMA Jamming Detection

Application Note

UMTS/HSPA Module Series

Rev. WCDMA_Jamming_Detection_Application_Note_V1.0

Date: 2014-11-04

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About the Document

History

Revision

Date

Author

Description

1.0

2014-11-04

Jacky ZHANG

Initial

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Contents

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

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

1Introduction..........................................................................................................................................4

1.1. Scope of Document .....................................................................................................................4

2Jamming Detection Overview.............................................................................................................5

2.1. Application Overview ...................................................................................................................5

2.1.1. Report Jamming Status via URC.....................................................................................6

2.1.2. Report Jamming Status via URC Periodically..................................................................6

2.2. Configure Optimized Detection Parameters................................................................................6

3AT Commands Description.................................................................................................................7

3.1. AT+QJDCFG Jamming Detection Configuration ......................................................................7

3.2. AT+QJDR Jamming Detection Report......................................................................................8

3.3. URC Description ..........................................................................................................................9

3.3.1. Disturbed Indicator...........................................................................................................9

3.3.2. Jammer Removal Indicator..............................................................................................9

4Example ..............................................................................................................................................10

4.1. Report Jamming via URC..........................................................................................................10

4.2. Report Jamming via URC Periodically.......................................................................................10

4.3. Enable and Disable Jamming Detection....................................................................................11

4.4. Configure Jamming Detection ...................................................................................................11

5Appendix A Reference.......................................................................................................................13

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1Introduction

ACellular Communication Jammer can totally paralyze all kinds of mobile and portable phones working in

the GSM/WCDMA bands. Quectel standard modules offer jamming detection functionality which allows

the unit to sense attempts to disrupt the GSM/WCDMA communication by interference with the signal.

Quectel module‟s sophisticated jamming detection enables enhanced security features and immediate

alarm notification if communication interference is detected. This document gives a detailed explanation

on how to use the Jamming Detection function of Quectel standard modules.

1.1. Scope of Document

Quectel Jamming Detection function is applicable to the following modules:

UC20 UMTS/HSPA+ series

UC15 UMTS/HSDPA series

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2Jamming Detection Overview

Quectel‟s Jamming Detection allows the user to identify active jamming of the GSM/WCDMA network.

Many alarm, security and life critical operations rely on the use of GSM/WCDMA mobile communications.

Criminals and those that intent on preventing time critical messages may use GSM/WCDMA jammers to

interfere with normal network operation. Quectel‟s Jamming Detection can allow Quectel module to detect

jamming signals. When jamming is detected, Quectel module sends a notification to MCU, reporting the

presence of active jamming of the GSM mobile communication network.

Figure 1：Jamming Application Diagram

2.1. Application Overview

Quectel Jamming Detection supports to report the appearance and disappearance of jamming

automatically via URC to notify the MCU. Also you can manually query the jamming status by the QJDR

read command when AT+QJDR=1 was set before (see Chapter 3.2). The following sections describe how

to use these functionalities.

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2.1.1. Report Jamming Status via URC

After Jamming Detection function is enabled by AT+QJDR=1, and URC output is enabled by command

AT+QJDCFG=“URC”,1. The Jamming Detection function can work well with the default settings. If

jamming is detected, the module will report “+QJDR: JAMMED” through URC port. If jamming is removed,

the module will report “+QJDR: NOJAMMING” through URC port. If URC of this function is not reported,

query whether the jamming status is available or not by “AT+QJDR?”. For detailed details, please refer to

Chapter 4.1.

2.1.2. Report Jamming Status via URC Periodically

There are two ways to report URC for indicating jamming status. One is reporting URC only once as

described in section 2.1.1; the other is reporting URCs periodically. Firstly, enable the Jamming Detection

function of Quectel module by AT+QJDR=1 and AT+QJDCFG=“URC”,1, and then set the <period> by

AT+QJDCFG. If jamming is detected, the module will report a URC “+QJDR: JAMMED”through URC

port every <period> seconds. If jamming is removed, the module will report “+QJDR: NOJAMMING”

through URC port. For more details, please refer to Chapter 4.2.

2.2. Configure Optimized Detection Parameters

Quectel Jamming Detection supports to optimize the detection conditions by configuring <mnl> and other

parameters of AT+QJDCFG. To detect and report the jamming, some basic conditions are verified.

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3AT Commands Description

Quectel Jamming Detection can be configured by AT+QJDCFG command and activated by AT+QJDR

command. If a Cellular Communication Jammer is active in its range, the module can detect and give

indication to you via URC.

3.1. AT+QJDCFG Jamming Detection Configuration

This command allows module to configure the options of Jamming Detection feature. These options

include the Jamming Detection conditions, the Jamming notification methods, etc. Parameters will be

automatically saved into NVRAM after being configured successfully.

AT+QJDCFG Jamming Detection Configuration

Test Command

AT+QJDCFG=?

Response

+QJDCFG: "urc",(0,1)

+QJDCFG: "period",(0-120)

+QJDCFG: "mnl",(0-31)

+QJDCFG: "minch",(0-254)

+QJDCFG: "maxrscp",(-85~-60)

+QJDCFG: "maxecio",(20-70)

+QJDCFG: "minsqual",(-30~10)

+QJDCFG: "maxsrxlev",(25-60)

+QJDCFG: "pscanfinelev",(-500~800)

Read Command

AT+QJDCFG?

Response

+QJDCFG: "urc",<value>

+QJDCFG: "period",<value>

+QJDCFG: "mnl",<value>

+QJDCFG: "minch",<value>

+QJDCFG: "maxrscp",<value>

+QJDCFG: "maxecio",<value>

+QJDCFG: "minsqual",<value>

+QJDCFG: "maxsrxlev",<value>

+QJDCFG: "pscanfinelev",<value>

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Parameters

3.2. AT+QJDR Jamming Detection Report

Jamming Detection can be activated by QJDR command. Parameters will be automatically saved into

NVRAM after being configured successfully.

Write Command

AT+QJDCFG=<type>,<value>

Response

ERROR

<type> String type, define the name of settings type

<value> Digital type, define the value of type

“urc” URC defines the type of jamming detection report. When set to „1‟, the

detection report will be pushed to the URC port. When set to „0‟, the

detection report will not be pushed to the URC port. Default value: 0.

Range: 0,1

“period” Period of URC of auto jamming detection report. When set to „0‟, no

periodic reporting. Default value: 0. Range: 0-120, unit: s

“mnl” The maximum jamming signal strength threshold (For GSM network only).

Default value: 17. Range: 0-31

“minch” The minimum channel number which is jammed (For GSM network only).

Default value: 5. Range: 0-254

“minch” The minimum channel number which is jammed (For GSM network only).

Default value: 5. Range: 0-254

"maxrscp" The maximum RSCP threshold (For WCDMAnetwork only). Default value:

-80. Range: -85~-60

"maxecio" The maximum ECIO threshold (For WCDMA network only). Default value:

40. Range: 20-70

"minsqual" The minimum S_QUAL threshold (For WCDMA network only). Default

value: -5. Range: -30~10

"maxsrxlev" The maximum S_RXLEV threshold (For WCDMA network only). Default

value: 30. Range: 25-60

"pscanfinelev" Considered very good signal power threshold while power scanning (For

WCDMA network only). Default value: 100. Range: -500~800

AT+QJDR Jamming Detection Report

Test Command

AT+QJDR=?

Response

+QJDR: (0,1)

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Parameters

3.3. URC Description

3.3.1. Disturbed Indicator

If the module detects a Jammer, it will send the URC “+QJDR: JAMMED”to the serial port.

3.3.2. Jammer Removal Indicator

If the Jammer was removed then it will send the message "+QJDR: NOJAMMING" to the serial port.

Read Command

AT+QJDR?

Response

If <mode> was set to “1” which means enable the

jamming detection function, return:

+QJDR: NOJAMMING

+QJDR: JAMMED

If <mode> was set to “0” which means disable the

jamming detection function, return:

+QJDR: 0

Write Command

AT+QJDR=<mode>

Response

ERROR

<mode> Disable or enable the jamming detection function

0 Jamming Detection function is disabled (default is 0)

1 Jamming Detection function is enabled

About URC description, please refer to Chapter 3.3

Indication of Jammer Presence

+QJDR: JAMMED

Indication of Jammer Removal

+QJDR: NOJAMMING

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