Dynamic Power Measurement Description

Last updated: December 3, 2008

The Dynamic Power measurement is similar the EDGE Dynamic Power (EDP) Measurement . The difference being that the Dynamic Power measurement is limited to GMSK bursts in GSM and GPRS test modes, whereas the EDP measurement can measure GMSK bursts in GSM and GPRS test modes, as well as GMSK and 8PSK bursts EGPRS test mode.

How is a Dynamic Power Measurement Made?

The Dynamic Power measurement performs a series of consecutive power measurements on a mobile station returning a power measurement and an integrity value for each burst measured. Dynamic Power is only available via the test set's remote user interface.

NOTE

When using the Dynamic Power measurement with an EGPRS mobile, you must select a modulation coding scheme which uses GMSK modulation (MCS1 through MCS4). The Dynamic Power measurement does not support 8PSK modulation coding schemes (MCS5 through MCS9).

Dynamic Power is not an ETSI specified measurement.

The signal is measured at the RF IN/OUT port.

Single or Multi-Measurements

The Dynamic Power measurement does not use the multi-measurement state parameter, and so does not return minimum, maximum, and standard deviation values. Instead, you specify the number of bursts that you want to measure using the Number of Bursts parameter (see SETup:DPOWer:COUNt:NUMBer[:SELected] ). A single measurement returns the integrity indicator and power level for every burst measured. For example, if you set the number of bursts to 15, the returned comma-separated list contains 15 integrity values followed by 15 corresponding measurement values.

Types of Signals Dynamic Power can Measure

Dynamic Power measurements can be made on these types of input signals:

Normal TCH or PDTCH burst with mobile station in active cell mode.
Normal TCH or PDTCH burst with mobile station in test mode (no protocol).

Input Signal Requirements

The Dynamic Power measurement will complete and meet its measurement accuracy specifications when the signal meets the following input signal conditions.

Input signal level is between -20 dBm and +43 dBm.
Input signal level is within +3 dB and -3 dB of the expected input level. For all subsequent burst the input signal level is within 0 to -6 dB plus the Expected Maximum Difference of the previous burst.
Input signal is within 100 kHz of the measurement frequency.
The measurement frequency is within the currently selected band.

Trigger Source

The only trigger source that the Dynamic Power measurement supports is RF Rise.