Site Troubleshooting Guide LTE

RBS 6000 Series RBS 6102 RBS 6101 RBS 6201 RBS 6601 RBS 6301 RRU MetroPCS primarily uses RBS 6201 inside a weatherized cabinet MetroPCS primarily uses SIMO Some sites will use RBS 6601 with RRUs, but not currently available

Weatherized Cabinet Majority of MetroPCS sites are outdoors

Cabinet – Back

RBS 6201 Hardware DUL – Digital Unit LTE RU – Radio Unit SIMO Tx/Rx1

Cabinet Diagram Fans Radio RUs DUL CC Power SIU C Transmission

Cabinet – No Jumpers Power RUs DULs SIU

Cabinet – Jumpers Antenna Jumpers Power DUL RUs

Diplexer Site Diplexer LTE CDMA Output Input

Diplexer Detail Output Input Diplexers

Visit Preparation Printed Materials RFDS Sheet with all plumbing diagrams Notes about site access Directions Satellite image Site Shakedown report Equipment Cabinet key Dummy load set Sitemaster Laptop setup to run TEMS Investigation with UE

Equipment Sitemaster Laptop with UE Cabinet Key

First Steps Best Practices Take photos! Be prepared Ensure E-UTRAN support is available Notify relevant parties based on customer procedures Visual Inspection Make sure nothing immediately looks incorrect Trace the RU-DUL cables to ensure there are no swaps Ensure the RU-DUL cables have a good connection Check small QMA wave guide for damage and ensure connection

Photos Take a photo of the site label to identify pictures

RU to DUL Jumper check Ensure the RU-DUL jumpers are correct DUL RU

RUL QMA Wave Guide Check Check small QMA wave guide for damage and ensure connection Bent Correct

RUL QMA Wave Guide Check Bent Connector Disconnected Connector

Common Issues Sector Swaps DL or UL throughput low Bad or no coverage Azimuth incorrect

Sector Swaps Causes RU-DUL cables Jumpers from cabinet to diplexer Jumpers from diplexer to antenna feeders Antenna feeders to antennas CDMA incorrect Do not trust colors on cables Troubleshooting Steps E-UTRAN lock test Cable tracing

E-UTRAN Lock Test Procedure Conclusion Have E-UTRAN lock a single sector Verify the reference signal transmit light stops blinking Repeat for each sector Conclusion Ensures that the DUL is configured correctly Verifies there is no RU-DUL cable swap

E-UTRAN Lock Test Blinking No Light Transmitting reference signals Locked

Antenna Jumper check Verify all cables match colors in plumbing diagrams Non-diplex site Trace the antenna jumpers from the RUL to the back of the cabinet Trace the antenna jumpers from the cabinet to the antenna feeders Diplex site Trace the antenna jumpers from the cabinet to the diplexer Trace the antenna jumpers from the diplexer to the antenna feeders

Antenna Jumper Check Verify all cables match colors in plumbing diagrams Sector 4 Sector 5 Sector 6

Antenna Jumper Check Trace the antenna jumpers from the RUL to the back of the cabinet Jumpers exit cabinet Jumpers at RUL

View – Cabinet Back Jumpers exit cabinet

Antenna Jumper Check Trace the antenna jumpers from the cabinet to the antenna feeders Jumpers from cabinet Antenna feeders

Antenna Jumper Check – Diplex Trace the antenna jumpers from the cabinet to the diplexer Jumpers from cabinet Jumpers enter Diplexer

Antenna Jumper Check – Diplex Trace the antenna jumpers from the cabinet to the diplexer Jumpers from cabinet Jumpers enter Diplexer

DL or UL throughput low Causes Troubleshooting Steps Backhaul Antenna system and jumpers Hardware problems with RU-DUL Troubleshooting Steps Dummy Load Test Feeder Sweeps E-UTRAN support

Dummy Load test Procedure Trace the power connector to the RUL and turn it off Detach the antenna jumpers from the RUL Connect the attenuators to the RUL Connect the dummy antennas to the attenuators Power on the RUL Have EUTRAN unlock the target sector and lock all other sectors Place the UE near the dummy antennas Upload and download a file and record a TEMS log Conclusion Eliminates or identifies antenna system cause of problem

Dummy Load Test Trace the power connector to the RUL and turn it off Power light off

Dummy Load Test Detach the antenna jumpers from the RUL Disconnected Jumpers

Dummy Load Test Connect the attenuators to the RUL Use high power attenuators Adapters Attenuators Ensure attenuators are connected to both Tx/Rx2 and Rx2

Dummy Load Test Connect the dummy antennas to the attenuators

Dummy Load test Power on the RUL Power light on Power Button Power Connector

Dummy Load Test Have EUTRAN unlock the target sector and lock all other sectors Ensure blinking

Dummy Load Test Place the UE near the dummy antennas Dummy antennas UE

Dummy Load Test Upload and download a file and record a TEMS log

Feeder Sweeps Tests Voltage Standing Wave Ratio Return Loss Distance to Fault Covered in a different guide Conclusion Determines if there are problems in the antenna system

E-UTRAN support Procedure Conclusion Connect to the cell (dummy load or otherwise) Download or upload a file Have E-UTRAN monitor the node Conclusion Determines if there is a configuration problem or a problem in the backhaul

Bad or No Coverage Causes Troubleshooting Steps Antenna System Jumpers not connected Hardware problems with RU-DUL (damaged connectors) Troubleshooting Steps Ensure all connectors are tightly secured Dummy Load Test Feeder Sweeps

Incorrect Azimuth Troubleshooting Steps Drive Test Visual inspection of antenna direction

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