Quectel UC15 MUX User Manual

UC15 MUX User Guide

UMTS/HSPA Module Series

Rev. UC15_MUX_User_Guide_V1.0

Date: 2014-07-11

www.quectel.com

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About the Document

History

Revision

Date

Author

Description

1.0

2014-07-11

Max TANG

Initial

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Contents

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

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

Table Index ................................................................................................................................................... 5

Figure Index ................................................................................................................................................. 6

1 Introduction .......................................................................................................................................... 7

2 The Design Purpose of MUX ............................................................................................................... 8

3 MUX AT Command ............................................................................................................................... 9

3.1. AT+CMUX Enable/disable MUX Control Channel .................................................................. 9

4 The Multiplexer Protocol ................................................................................................................... 11

4.1. Frame Structure ..................................................................................................................... 11

4.1.1. Flag Field ........................................................................................................................ 11

4.1.2. Address Field ................................................................................................................. 11

4.1.2.1. EA .......................................................................................................................... 11

4.1.2.2. C/R ......................................................................................................................... 11

4.1.3. Control Field ................................................................................................................... 12

4.1.4. Length Field.................................................................................................................... 13

4.1.5. Information Field ............................................................................................................ 13

4.1.6. FCS Field ....................................................................................................................... 13

4.2. Frame Type............................................................................................................................ 14

4.2.1. SAMB ............................................................................................................................. 14

4.2.2. UA................................................................................................................................... 14

4.2.3. DISC ............................................................................................................................... 14

4.2.4. DM .................................................................................................................................. 15

4.2.5. UIH ................................................................................................................................. 15

4.3. Control Channel ..................................................................................................................... 15

4.3.1. Message Format ............................................................................................................ 15

4.3.2. Message Type and Actions ............................................................................................ 16

4.3.2.1. Power Saving Control (PSC) ................................................................................. 16

4.3.2.2. Multiplexer Close Down ......................................................................................... 16

4.3.2.3. Flow Control on Command (FCon) ....................................................................... 17

4.3.2.4. Flow Control off Command (FCoff) ....................................................................... 17

4.3.2.5. Modem Status Command (MSC) .......................................................................... 17

4.4. Procedure .............................................................................................................................. 20

4.4.1. MUX Establishment ........................................................................................................ 20

4.4.2. MUX Release ................................................................................................................. 20

4.4.3. Data Transfer .................................................................................................................. 21

4.4.3.1. Information Data .................................................................................................... 21

4.4.3.2. Time-out Considerations ....................................................................................... 21

4.4.3.3. Flow Control ........................................................................................................... 22

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5 Power Saving Mode Under MUX ...................................................................................................... 23

5.1. Power Saving Mode Based on DTR Pin Only ....................................................................... 23

5.1.1. Host Enables Module to Enter into Power Saving Mode ............................................... 24

5.1.2. Host Enables Module to Exit from Power Saving Mode ................................................ 25

5.1.3. Module Enables Host to Exit from Power Saving Mode ................................................ 25

5.2. Power Saving Mode Based on PSC Frame and DTR Pin .................................................... 26

5.2.1. Host Enables Module to Enter into Power Saving Mode ............................................... 27

5.2.2. Host Enables Module to Exit from Power Saving Mode ................................................ 28

5.2.3. Module Enables Host to Exit from Power Saving Mode ................................................ 28

6 Example .............................................................................................................................................. 29

6.1. Samples for Frame Structure ................................................................................................ 29

6.2. Establish Channels ................................................................................................................ 30

6.3. Frame Transmission .............................................................................................................. 31

6.4. Power Saving Mode and Wake Up ....................................................................................... 32

6.5. Flow Control .......................................................................................................................... 32

6.6. Synchronization ..................................................................................................................... 33

6.7. Closing Down Multiplexers .................................................................................................... 34

7 Appendix A Reference ....................................................................................................................... 35

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Table Index

TABLE 1: MUX FRAME STRUCTURE ............................................................................................................... 11

TABLE 2: ADDRESS FIELD ............................................................................................................................... 11

TABLE 3: C/R .................................................................................................................................................... 12

TABLE 4: THE CODING OF CONTROL FIELD ................................................................................................ 12

TABLE 5: THE STRUCTURE OF LENGTH FIELD ........................................................................................... 13

TABLE 6: MAPPING FROM THE CONTROL SIGNAL OCTET BY A RECEIVING ENTITY ............................. 19

TABLE 7: MAPPING TO THE CONTROL SIGNAL OCTET BY A SENDING ENTITY ...................................... 19

TABLE 8: AT COMMAND CONFIGURATION BASED ON DTR PIN ................................................................ 23

TABLE 9: AT COMMAND CONFIGURATION BASED ON PSC FRAME AND DTR PIN.................................. 26

TABLE 10: RELATED DOCUMENTS ................................................................................................................ 35

TABLE 11: TERMS AND ABBREVIATIONS ...................................................................................................... 35

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Figure Index

FIGURE 1: MUX ARCHITECTURE ..................................................................................................................... 8

FIGURE 2: UA FRAME (RESPONSE) .............................................................................................................. 14

FIGURE 3: POWER SAVING FLOW CHART (1) .............................................................................................. 24

FIGURE 4: POWER SAVING FLOW CHART (2) .............................................................................................. 27

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1 Introduction

This document mainly introduces the technical details of Quectel MUX (Multiplexer Protocol) and provides
examples on how to develop MUX on devices.

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2 The Design Purpose of MUX

As to a non-multiplexer device, it is so inefficient to deal with only one kind or one channel of data steam
during a period of time. Therefore, Quectel multiplexer is designed to create 4 virtual channels on a
physical port in order to transmit data simultaneously. It looks like four real physical channels for the
application. They could operate the logical action on every virtual channel, such as using the SMS service
or PPP dialing.

All the data from APP is packed as the frames, and the frames consist of the data and protocol field which
clearly indicate the channel No., the length of the information and the FCS and so on. The frames are
transmitted as one stream via the serial port. After arriving at the other peer, they are unpacked as four
streams by the MUX protocol stack and transmitted to the application. Besides the information data, the
control signals are also simulated.

TE

UE

Application

DLC4

DLC3

DLC2

DLC1

MUX Driver

Physical Layer

DATA

MUX Driver

APP TASK

DLC4

DLC3

DLC2

DLC1

MUX Driver

Physical Layer

DATA

DS MUX TASK

Multi DATA

Figure 1: MUX Architecture

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3 MUX AT Command

3.1. AT+CMUX Enable/disable MUX Control Channel

This command is used to enable/disable the MUX control channel. The AT command sets parameters for
the control channel. If the parameters are left out, the default value will be used.

Parameter

AT+CMUX Enable/disable MUX Control Channel

Test Command

AT+CMUX=?

Response

+CMUX: (list of supported <mode>)[,(list of supported
<subset>)[,(list of supported <portspeed>)[,(list of
supported <N1>)[,(list of supported <T1>)[,(list of
supported <N2>)[,(list of supported <T2>)[,(list of
supported <T3>)[,(list of supported <k>)]]]]]]]]

OK

Read Command
AT+CMUX?

Response

+CMUX:
<mode>[,<subset>[,<portspeed>[,<N1>[,<T1>[,<N2>[,<T2
>[,<T3>[,<k>]]]]]]]]

OK

Write Command

AT+CMUX=<mode>[,<subset>[,<port
speed>[,<N1>[,<T1>[,<N2>[,<T2>[,<T3
>[,<k>]]]]]]]]

Response

OK

<mode> 0 Basic option.
<subset> This parameter defines the way in which the MUX control channel is set up.

Virtual channel may subsequently be set up differently, but in the absence of any
negotiation for the settings of a virtual channel, it shall be set up according to the
control channel <subset> setting.
0 UIH frames used only.
1 UI frames used only.

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Example

AT+CMUX=0

OK

AT+CMUX?

+CMUX: 0,0,5,127,10,3,30,10,2

OK

AT+CMUX can only be executed on UART1 since UC15 only supports MUX function via UART1.

2 I frames used only.
<portspeed> 1 9600bit/s
2 19200bit/s
3 38400bit/s
4 57600bit/s
5 115200bit/s
6 230400bit/s
7 460800bit/s
<N1> Maximum frame size, the range is 1-32768, 127 is the default value for basic

option (see <mode>).

<T1> The time UE waits for an acknowledgement before resorting to other action (e.g.

transmitting a frame).The step size is ten milliseconds, the range is 1-255. The
default value is 100ms.

<N2> Maximum number of re-transmissions, the range is 0-255, the default value is 3.
<T2> Response timer for MUX control channel, the step size is ten milliseconds, the

range is 2-255, 30 is the default value.

<T3> Wake up response timer in seconds. The range is 1-255, 10 is the default value.
<k> Window size (It is not supported for UC15).

NOTE

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