EGPRS Data Rate Configurations

EGPRS Data Rate Configurations

Last updated: January 18, 2010

This section is only applicable to EGPRS. This section assumes that you have the most recent hardware and software revisions in your test set. For details on what configurations your test set supports, see:

You may need to upgrade the hardware in your test set to get the capability described here. If you install application firmware on a test set with incompatible hardware, the following may occur:

  • Your test set may lock up.
  • The application may not run.
  • Some features in the application may not be accessible, or may not perform to specifications.

Please review the hardware requirement information at

to determine if a hardware upgrade is required for your testing needs.


This section details the test set's operation for the following:

By default, the test set does not make available multislot configurations or modulation coding schemes that it does not support for combinations of the following parameters: Operating Mode, Connection Type, Multislot Configuration, and Modulation Coding Scheme (MCS).

Unsupported data rate configurations can be enabled using the CALL:DATA:RATE:CONFig command (see CALL:DATA:RATE:CONFig[:EGPRs] ) or from the test set's front panel (see How Do I Gain Access to All the EGPRS Multislot Configurations? ). The value of this parameter can be set to either Supported or All.

Supported Configurations

The supported EGPRS Data Rate Configurations depend on the actual hardware configuration of the test set. By default the multislot configuration and modulation coding scheme settings are restricted to prevent the selection of configurations that would overload the protocol processor.

When setting to ALL, The EGPRS Data Rate Configuration setting allows this restriction to be overrided and enables access to all multislot configuration and modulation coding scheme settings, regardless of whether they are likely to function successfully. See All Configurations .

Operating Considerations for Supported Configurations

When the EGPRS Data Rate Configuration is set to Supported , the unsupported data configurations are grayed out on the MUI to prevent selection. Attempting to set the test set to an unsupported downlink multislot configuration or modulation coding scheme generates the following warning messages

GPRS/EGPRS functionality restriction; Requested multislot configuration not supported .

GPRS/EGPRS functionality restriction; Requested modulation coding scheme not supported.

If you change the Connection Type to an option that makes the current multislot configuration and modulation coding scheme combination unsupported, the multislot configuration is reset to the default value of 2x1. For example, if the multislot configuration is 1x2 and the modulation coding scheme setting is MCS-5, changing the connection type from ETSI Type A to BLER causes the multislot configuration to return to the default value of 2x1.

All Configurations

To gain access to the multislot configurations and modulation coding schemes not indicated as supported, you must set the EGPRS Data Rate Configurations parameter value to All.

When you change the EGPRS Data Rate Configurations parameter value to All , the following warning message appears on the front panel screen:

Warning: Not all EGPRS data rate configurations are supported .

Remember that although you now have access to all EGPRS data rate configurations, the performance of those not supported by the test set is not guaranteed. You can try to minimize the protocol processor loading to gain better performance.

The protocol processor loading is determined by many factors but the most relevant ones are:

  • Operating Mode: Active Cell mode is more processor intensive than the test modes
  • Connection Type: ETSI B, SRB Loopback and Auto require the most processor support, ETSI A the lest.
  • Logging: WPA Logging increases the load on the protocol processor.
  • Multislot Configuration: Processor loading increases with the number of timeslots, particularly uplink timeslots.
  • Modulation and Coding Scheme: the GMSK requires the lease protocol processor resource, then 8PSK, 16QAM and 32 QAM.

Why use Unsupported Data Rate Configurations?

While the test set may not currently guarantee support for all EGPRS data rate configurations, some unsupported configurations can still be used to verify your mobile station's capabilities if you need to perform a quick verification rather than intensive testing. When using unsupported configurations the following considerations apply:

  1. In general, unsupported configurations may work if you minimize other activities such as receiver measurements (or protocol logging in the lab application).
  2. If you want to use the data channel (lab application only) to verify your mobile station's ability to transmit 2 timeslots using 8PSK modulation use the following combination:
    • multislot configuration - 2x2
    • modulation coding scheme - MCS-5
    • connection type - Auto
    • data channel application - something with intermittent data like WAP transfers. (Avoid ftp transfers.)

    Additionally, you should perform activities such as receiver measurements and protocol logging one at a time. For example, turn off logging while performing a receiver measurement and turn off receiver measurements while using protocol logging. Unidirectional transfers such as uplink FTP or downlink FTP are also a good way to minimize loading in the downlink or uplink, respectively.

Related Topics


How Do I Gain Access to All the EGPRS Multislot Configurations?

Gain Access to All EGPRS Data Rate Configurations

Modulation Coding Scheme/Puncturing Scheme (MCS/PS)

Supported Multislot Classes