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Using BLR863 site to make this case. After check BLR863, we found out the RTWP is abnormal, more than -80dbm, and it s whole day. ’
At this time, we need know the interference is from external or inner, so we make a RTWP report also include the BLR863 neighbor site. From the report, we can know, it s only BLR863 face ’
RTWP problem. So we doubt it is inner interference. As below:
Base on inner interference, we can check the Tx/Rx and Rx RTWP value in diferent sector. As below: In NodeB LMT, in Maintence function, choose Board RTWP , this site is DBS3900, so input “
”
“
”
Subrack No 60/61/62, means check the cell1/cell2/cell3 Tx/Rx and Rx RTWP. PS: If it is BTS3900, the Subrack No is 4, and the Slot No should be 0/2/4, it means cell1/cell2/cell3
Kindly check the below 3 cells Tx/Rx and Rx RTWP, in each window, the green color line is Tx/Rx RTWP, the brown color line is Rx RTWP. 2013-8-10
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From the trace, we can know the RTWP is abnormal, every cell the Tx/Rx and Rx are more than -70dbm, and the Subrack No 60 is special, because the Tx/Rx and Rx difference is too much, more than 14db, and the fluctuate is also not same, and the fluctuate is not regular. So it is confirm that, the Subrack No 60, this sector has problem, need check the Tx/Rx and Rx path.
From the alarm we also can found out:
For further analyze, we can turn off the power amplifier, to check the Tx/Rx and Rx RTWP is getting normal or not, if it is yes, so it can further proof it s not external ’
interference .
interference, it’s inner
Because we do not have right to turn off it. So I just give the command as below:
After finish test, need change back. And further more, we can exchange the Tx/Rx and Rx cable in RRU side, if the abnormal also 2013-8-10
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exchange, so it is not NodeB exquipment issue. And then, we can exchange the cable in antenna side between diferent sectors. If the abnormal not tranfer, so it should be anternna problem, need change antenna.
2013-8-10
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