The AWGN power must not be more than 10 dB above or 25 dB below cell power when both power states are set to ON.
Last updated: 2014-11-28
The test set's base station emulator provides control over the following RF power levels:
Îoris defined in 3GPP TS 25.102 as the received power spectral density of the downlink signal as measured at the UE antenna connector. The downlink contains one or more downlink physical channels. The Cell Power setting sets the absolute level (in dBm) of the physical channels. The individual physical channel levels account for fractions of this setting, and are set in dB relative to the cell power (see Downlink Channel Codes and Levels ). If you have accounted for path loss (see Amplitude Offset ) between the test set output port and the UE antenna connector, then cell power is equivalent to Îor .
Ioc is defined in 3GPP TS 25.102 as the power spectral density of a band-limited white noise source (simulating interference from other cells) as measured at the UE antenna connector. If you have accounted for path loss, then AWGN (Additive White Gaussian Noise) power is equivalent to Ioc .
Io is defined as the total received power spectral density, including signal and interference, as measured at the UE antenna connector. The total RF power is the sum of cell power and AWGN power. If you have accounted for path loss, then total RF power is equivalent to Io.
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The AWGN power must not be more than 10 dB above or 25 dB below cell power when both power states are set to ON. |
The range of values that you can set these power levels to differs from the actual hardware range of the source. This is due to compensation for path loss between the test set RF output port and the UE antenna connector (see Amplitude Offset ).
For example, if you enter a value of -30 dBm for desired CW cell power, this indicates that you want -30 dBm of power at the UE antenna connector. So, if you have indicated an amplitude offset of -3.5 dB exists between the test set's RF In/Out port and the UE antenna connector, the source will actually have to output -26.5 dB in order to deliver -30 dB to the UE's antenna connector. Thus, with an amplitude offset of -3.5 dB, the settable range of CW cell power is -130.5 dB to -13.5 dB. The actual power range at a given time is defined by adding the value of the associated amplitude offset to the actual hardware range. If you select an invalid combination of power levels and amplitude offsets, an error message will appear at the bottom of the screen to alert you to this condition.
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Parameter |
Actual Hardware Range with Amplitude Offset=0 |
Setting/Query Range |
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Cell Power |
-115 dBm/1.28 MHz to -13 dBm/1.28 MHz |
+37dBm/1.28MHz to -165dBm/1.28MHz |
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AWGN Power |
-115 dBm/1.28 MHz to -13 dBm/1.28 MHz |
+35dBm/1.28MHz to -165dBm/1.28MHz |
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Total RF Power |
-115 dBm/1.28 MHz to -13 dBm/1.28 MHz |
+39.12dBm1.28MHz to -165dBm/1.28MHz |
GPIB Commands: CALL:POWer