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Chapter 15 – GPRS Commands
Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 168
GPRS Parameters Customization +WGPRS
Description: This command modifies some of the GPRS parameters:
• The ATTACH-STATUS (the modem doesn’t automatically make a GPRS attachment after
initialization)
• The PDP-INIT-STATUS (activate automatically some defined PDP Contexts after initialization)
and
• The user-defined multislot class. This parameter represents the GPRS class chosen by the user
to perform power saving (by reducing TX [or uplink] time slots).
In addition, this command allows you to:
• Automatically set some defined PDP contexts to be activated after initialization.
• Set some parameters for the PALM® OS software: PPP Silent Mode (PPP waits for PPP Client
to start the dialog) and Slow CONNECT due to the delay of the processing of PALM® OK, the
CONNECT is sent one second after the dialing command request.
Important Note: The modem must be rebooted to activate the new setup except for <mode> 3, 5, 6
and 7 (refer to the Values section).
Values: <mode> A numeric parameter which specifies a GPRS parameter:
0 ATTACH-STATUS (the modem doesn’t automatically make a GPRS attachment after init)
1 PDP-INIT-STATUS (declare some PDP contexts liable to be activated automatically after
initialization by <mode>=2)
2 Set “ACTIVABLE” automatically after init a define PDP context
3 PPP silent mode
4 Definition of the GPRS multislot class
5 Slow CONNECT for PALM® OS
6 PPP Filtering
7 Automatic GPRS roaming inter-operator: if activated, the modem automatically re-
attaches itself to the network and reactivates its PDP context by changing the operator
when reaching border areas.
Notes:
• If <mode>=0, 1, 3, 4, 5, 6 or 7 <cid> and <class> will be ignored.
• If <mode>=0, 1, 2, 3, 5, or 6 <class> will be ignored.
• If <mode>=4 <parameter> and <cid> will be ignored. The modem must be restarted to
take the modification into account.
• PPP Filtering is a test-purpose functionality. It avoids sending some OS-specific frames on
the radio link, for accurate transfer rate measurements.
<parameter> A numeric parameter that controls the operation defined by <mode> if it is equal to 0, 1, 2
or 3
0 Operation Off (disabled)
1 Operation On (enabled)
<cid> (PDP Context Identifier). A numeric parameter that specifies a particular PDP context
definition. The parameter is local to the DTE-modem interface and is used in other PDP
context-related commands. The range of values is 0 to 4.
<class> GPRS multislot class number. It may be loser than the maximum possible class. Possible
values are 2, 8, 10, 12. Note that the ran
ge o
f values is dependent upon the modem.
Multislot
Class
Maximum
Number of Slots
Minimum Number of
Slots
Type
of MS
Rx Tx Sum T
ta
T
tb
T
ra
T
rb
2
8
2
4
1
1
3
5
3
3
2
1
3
2
1
1
1
1
10 4 2 5 3 1 2 1 1
12 4 4 5 2 1 2 1 1
Notes:
When the modem is set in CG class, the modem always makes an automatic GPRS attachment after
initialization. AT+WGPRS? always gives +WGPRS: 0,0 for the parameter 0.
The default value for mode 7 is 0. In this case, no automatic GPRS reconnection to a new operator is done
when reaching border areas.