MS Output Power

Description

The test set provides two methods to set the MS output power for a PS connection.

1. MS TX Level:

   Set the MS TX level directly.

2. Alpha and Gamma:

   Set the a (alpha) and T _ch (gamma) parameters. The MS output power is determined by the following arithmetic.

   P _CH = min[T ₀ -T _ch -a*(C+48), P _MAX )]

   where:

   • T ₀ : 39dBm for GSM 400, GSM 700, GSM 850 and GSM 900; 36dBm for DCS 1800 and PCS 1900
   • T _ch : MS and channel specific power control parameter sent to MS
   • a: system parameter broadcast on PBCCH or optionally sent to MS
   • C: the normalized received signal level at the MS
   • P _MAX : the maximum allowed output power in the cell

Configurable Parameters

MS output power selection mode

This parameter specifies the method by which the MS output power is determined for a PS connection. The method used is either the directly setting of MS TX Level or the more complete solution relation to power control parameters a (alpha) and T _ch (gamma).

The GPIB command to set the MS output power selection mode is CALL:(PDTCH|PDTChannel):MS:OPSMode .

MS TX Level

The GPIB command to set the MS TX Level parameter is CALL:(PDTCH|PDTChannel):MS:TXLevel[:SELected]:BURSt<[1]|2|3|4|5> .

The GPIB command to set the Deferred MS TX Level parameter (which is used during the handover) is CALL:SETup:(PDTCH|PDTChannel):MS:TXLevel[:SELected]:BURSt<[1]|2|3|4|5> .

Alpha

This parameter is systematic, broadcast on PBCCH or optionally sent to MS in an PLC control message. It determines the proportion of the measured broadcast channel to be used in the above arithmetic.

The GPIB command to set the Alpha parameter is CALL:(PDTCH|PDTChannel):MS:ALPHa .

Gamma

This parameter is an MS and channel specific power control parameter, sent to the MS in an RLC control message. The gamma values are specified on a per timeslot basis, and the number of the uplink timeslots can be up to 5. Each set of gamma setting is available on a per band basis.

The GPIB command to set the Gamma Burst parameter is CALL:(PDTCH|PDTChannel):MS:GAMMa:BURSt<[1]|2|3|4|5>[:SELected] .

The GPIB command to set the Deferred Gamma Burst parameter is CALL:SETup:(PDTCH|PDTChannel):MS:GAMMa:BURSt<[1]|2|3|4|5>[:SELected] .

How Do I Configure the Alpha and Gamma Parameter?

This procedure is only applicable to the lab application. This procedure describes how you manually configure the ARAC Control parameters in the test set.

1. Press the CALL SETUP screen key.
2. Press PDTCH Parameters ( F9 ).
3. Press MS TX Level ( F10 ).
4. Set MS Output Power Selection Mode to Alpha Gamma.
5. To change a parameter in this menu, use the knob to scroll to, highlight, and change the parameter settings.

Operating Considerations

The Alpha and Gamma parameters are only available when the operating mode is set to Active Cell .

Related Topics

Dual Transfer Mode

CALL:(PDTCH|PDTChannel)

CALL:SETup