User's Manual
Advanced RF Technologies, Inc.
61
7.2.2 HE Commissioning
HE commissioning is composed of HE BCU and HE RFU commissioning. The HE BCU is an optional component
and should be used when WPSs’ signals are being used in the same frequency band.
7.2.2.1 Composite power
To perform HE commissioning, the user should calculate downlink composite input level and add the proper
amount of breath room required for rise in traffic.
x Information that is needed to calculate commissioning levels are:
- Service frequency band
-Service technology
- The number of wireless service provider
- The number of carriers per technology
- The number of band sharing same amplifier
7.2.2.1.1 DL Composite Input Level Calculations for HE Commissioning
7.2.2.1.1.1 Single WSP in a frequency band
x Measure the output power of the BTS signal that will be inserted into the RFU using a Spectrum Analyzer.
- If input signal includes more than one technology, then measure the composite power of each
technology.
x Based on Table 7-2, calculate the maximum composite input level by using the following formula:
o “Output power of BTS of technology being used” + “back-off value” (refer to Table 7-2)
- If calculated composite HE DL input power exceeds the permitted maximum input range, then
additional attenuation will need to be added so that the calculated HE DL input power does not
exceed 25dBm.
Table 7-2 Back-off value for each technology due to traffic breathing
Technology Connected to BTS
CDMA
6~8dB
1xEVDO
6~8dB
WCDMA
8~10dB
HSPA
8~10dB
iDEN
0~3dB
GSM
0~3dB
LTE
8~10dB
7.2.2.1.1.2 Multiple WSPs in a frequency band
When multiple WSPs exist in a frequency band at the same time, the ADX-H-BCU can be used to
combine/divide the signals received from multiple WSPs.
- The ADX-H-BCU can receive up to 3 incoming DL signals. Each incoming signal can be attenuated
individually allowing the user to specify power ratios to control the power per carrier.
- The downlink path of BCU has the input range from 0 to 25dBm.
- If the downlink output of BCU exceeds DL output ALC level set by user, ALC function will activate
and limit the DL output from exceeding the defined ALC level.
- The DL output of ADX-H-BCU is transferred to the DL input of RFU.
x Measure the output power of the BTS signal that will be inserted into the BCU using a Spectrum Analyzer.
- If input signal includes more than one technology, then measure the composite power of each
technology.
x Based on Table 7-2, calculate the maximum composite input level by using the following formula:
o “Output power of BTS of technology being used” + “back-off value” (refer to Table 7-2)