Last updated: 2014-11-28
The Manual Power Range Offset setting allows you to enter the value of actual UE Tx power offset manually. This setting has been applied to four measurements: Adjacent Channel Leakage Ratio (ACLR) Measurement, Channel Power Measurement, Spectrum Emission Mask (SEM) Measurement, and Waveform Quality Measurement.
The value should be in the range of -25 dB to 25 dB.
The default value is 0.00 dB.
Under HSUPA connection, the Manual Power Range Offset for E-PUCH time slot and for UL DPCH/HS-SICH time slot can be calculated as follows:
For E-PUCH time slot:
In the E1969A TD-SCDMA application, pathloss compensation is disabled, and the Δharq is fixed to ‘0’. Similar to open loop power control for E-PUCH, the Pe-base power has 0 dB offset to the DPCH target power. A separate closed loop power control process maintains the Pe-base by substracting βe from the received E-PUCH power. All existing UL DPCH power control link procedures apply to E-PUCH as well.
The actual power of E-PUCH will fluctuate along with the selected E-TFC transport block size, the allocated E-PUCH physical resources, and the modulation type. In the E1969A TD-SCDMA application, during a HSUPA connection, the SFE-PUCH is fixed now, and the reference code rates and its power offset are fixed too. So the actual range of E-PUCH’s power is calculated as below:
Table 1: E-PUCH's Power Offset Range to DPCH Target Power during a 12.2k RMC + HSPA connection
|
FRC Type |
E-PUCH’s power range (dB) |
|
FRC1a, FRC1b |
[-6, 9.901] |
|
FRC2 |
[-3, 13.633] |
|
FRC3 |
[0, 16.214] |
E1969A TD-HSUPA application will range both measurement and link receivers to the nearest integer great than or equal to the highest E-PUCH power for each FRC, i.e. 10dB plus target power for FRC1, 14dB plus target power for FRC2, and 17dB plus target power for FRC3.
Currently the test set will not re-range the receivers when the E-PUCH parameters are changed, like the Absolute Grant Value. So it is important for you to calculate the power offset and compensate the offset by setting the Manual Power Range Offset in the measurement setup parameters to avoid any “under range” or “over range” issue.
Here is an example of how to set the manual power offset.
1. Before the change, the test set are set to the parameters as default:
AG value: 31
Target DPCH Power: -10 dBm
FRC: FRC3
The receiver of the test set will range to 7dBm.
2. Now, change the AG value to 6. The Beta-e value is 5.992. So the actual E-PUCH power should be around -4dBm. You can set the manual power offset to -11dB, the receiver will range to -4dBm
For UL DPCH/HS-SICH time slot: Offset (dB) = 3- (β0,e(max_possible_E-TFC) + αe + Δharq
β0,e(current_E-TFC) is the β0,e under current E-TFC case.
β0,e(max_possible_E-TFC) is the β0,e when the maximum E-TFC is chosen by UE under current FRC type and AG is set to be 31.
λ0 and λ1 is the reference code rates, and βλ0 and βλ1 are the power offset for the reference code rate 0 and 1.
For UL DPCH/HS-SICH time slot, the reason of adding 3 dB is that UL DPCH and HS-SICH have the same power level and they are in the
same time slot.
αe is a logarithmic value set as a function of the E-PUCH spreading factor (SFE-PUCH)
Δharq is set by higher layers, currently it is fixed to zero.
The sum of the Manual Power Range Offset and the Expected Input Power Level should not be larger than 30dB. Or else, the measurement won't be initiated due to the wrong configuration of the measurement receiver hardware. And it will cause the +755 error message prompts. For more details, see +700 through +799 Error Message Descriptions.
Measurement results are set to NAN and Measurement Integrity is set to Unsupported Configuration.
GPIB Command: SETup:TCPower:POWer:RANGe:OFFSet:MANual
SETup:TACLeakage:POWer:RANGe:OFFSet:MANual
SETup:TSEMask:POWer:RANGe:OFFSet:MANual
SETup:TWQuality:POWer:RANGe:OFFSet:MANual