4.3.2 Time Response of Open Loop Power Control

Last updated: May 24, 2006

Definition

Following a step change in the mean input power, the mean output power of the access terminal changes as a result of the open loop power control. This test measures the open loop power control time response to a step change in the mean input power.

Method of Measurement

Connect the access network emulator to the AT.
Set up a Test Application session. For Subtype 0 or 1 Physical Layer, open an RTAP connection and configure the Reverse Data Channel rate to 9.6 kbps. For Subtype 2 Physical Layer, open an RETAP connection and configure the Reverse Data Channel payload size to 256 bits with Termination Target of 16 slots.
Configure the Test Application FTAP (for Subtype 0 or 1 Physical Layer) or FETAP (for Subtype 2 Physical Layer) so that the ACK Channel Bit Fixed mode is disabled.
Set the frame activity factor for the access terminal under test to zero by setting the access network to send all packets to one or more alternate access terminals.
Set Î_or to -60 dBm/1.23 MHz.
Send alternating `0' and `1' power control bits on the Forward Traffic Channel.
Change Î_or by +20 dB, -20 dB, -20 dB, and +20 dB and measure the transmitted output power as a function of time after each step change for 100 ms.

Minimum Standard

The mean output power of the access terminal shall transition to its final value in a direction opposite in sign to the change in Î_or , with a magnitude contained between the mask limits as pictured below:

Simplified Mask Limit Equations

For an Î_or step change of 20 dB, the mask limit equations can be simplified and are as follows:

The upper pass/fail limit line is made up of three line segments. In the following formulas, p is mobile station power delta, in dB, and t is equal to time in milliseconds.