Rtwp Analysis _ways of Working
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RTWP Issue Resolution
MH Circle
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Possible reasons of High UL RSSI
Internal Causes
RBS Internal Interference
Faulty or loose components Cable, connectors and/or diplexers
Faulty Antenna/TMA/ASC
Incorrect parameter settings
Incorrect installation
Traffic load External Causes
GSM Cross Band Interference
High sites
External interference
UL RSSI (RTWP) Possible Reasons
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In House Checks
› Following Activity Should Done For Maintain High RTWP Cell
› Check all RF Parameter
› Check NBRs are defined properly (both 3G-3G and 3G-2G)
› Check SC Collision
›
Check Propagation Delay Report for checking overshooting .› Check Interference
› Check Site configuration
› Give the soft reset
› Scratch Site and recreate
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Checks During Field Visit
› If We not found any improvement after In House activities , the following activities are doneduring the field visit :
› Check the Az, Tilts are as per the design.
› See possibility of optimization from Az and Tilt point of view.
› Check if we are using Dual Band Antenna common for GSM and UMTS. Then possibility ofintermodulation can be worked out.
›
Check Parameter Setting is as per the cable length.› Check all the connector ,feeder cable and Jumper cable with site master .
› Conduct the Sweep test for the lines.
› Check main and diversity connection .
› Swap the Problematic sector to any other sector for check problem shift or not.
› a) Cable Swap
› b) RU Swap
› c) FU Swap
› Check the clutter like any reflecting body or any interference point (e.g. glass building ,water body,big hording board , railway line , etc.). If found reorient antenna .
› Check repeater near by site .
› If nothing is found in the above exercise, the do the spectrum drive test to know the interferencepoint and interference direction from any external source.
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Site Fixed in Past
› PUNE 32 X
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Note : We see that when RTWP improves , Call Drop decreases .
PUNE32X Pre-Post Data
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Following Activity Done at PUNE32X For Maintain RTWP
1.Check all RF Parameter
2.Check SC Collision
3.Check Site configuration
4. Scratch Site and recreated
5.Check Propagation Delay Report for checking overshooting .
We not found any improvement after Done this activity So we Go for field visit .Following activity done at field
1.Check all the connector ,feeder cable and Jumper cable .
2.Swap PUNE32X with PUNE32Y ,Now problem sift to PUNE32Y.
3. So we again check cables of PUNE32X with Site Master , Nothing was found .
4.Check the clutter and found that one metal hoarding board is in front of PUNE32X.5.So ,We reorient PUNE32X for 10 -15 Degree .
Finally after Reorientation RTWP is back to normal.
Activity Done at PUNE32
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CULPRIT CELLS
The list of culprit cells is attached herewith.
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RTWP Cluster Snap Shot
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RGOA101 RTWP CELLS-Same Cluster
Most of the GOA cells are shooting towards water body. Reorientation during field visit
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RNSK101 RTWP CELLS-Same Cluster
Since most of the sites are in same cluster.Worst Site DULE18 and DULE01 can be taken first.
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RNSK101 RTWP CELLS-Same Cluster
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RPUN102 RTWP CELLS-Same Cluster
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Recommendations
› IDEA team can prioritize the following Cells to begin with :
–DULE 18
–DULE 01
–
LATR 10 –PUN415
–PUN109
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Ways of Working
› Field team should take all required equipment : – A) sweep tester
– B) spectrum analyzer
– C) DT team
– D) Necessary tools for the optimization
› FIELD team should inform MS SPOC at least one day in advance with regard to the plan
of visit.› Since this can be a time consuming effort, the Field team should plan to stay at one site /
cluster at least for a day and need to work in close consultation with MS RF SPOC.
› With every Swap , RF team will monitor the stats at least for 1 hour to have theconclusive results and plan the next recommendation.
› MS SPOC for the activity is Mr Krishna Kant (9890370361) .
› Please take pictures for Antennas, Cabinet, Clutter (360 Degree Panaromic) for future
reference and reporting purposes.› Share Logs/reports of Sweep tests for analysis.
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