TASR Issues Handling Guide (V1.0)

7/23/2019 TASR Issues Handling Guide (V1.0)

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TASR Issues Handling Guide


Version 1.0


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Title TASR Issues Handling Guide V(1.0)

Issue Date7/21/2014

Drafted by Saad Rashid ( BTS Back Office)

Targeted Audience BSS SLM, FOPs, Regional Subcon BO


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Introduction:

The purpose of this guide is to improve knowledge base for handling of Cell level issues

where TASR is degraded. Most of the cases get prolonged due to mishandling. This guide

will allow users to perform step by step analysis to know the root cause of thedegradation.

Types of TASR degradation:

1. Single Sector degradation

2. Two sector degradation

3. All sectors degradation

Following are brief possible reasons for each type of degradation

1. Single Sector degradation

a. Alarm on RRUs

b. Abnormal VSWR

c. Wrong TRX power configuration

d. Partial Sector swap

e. Antenna tilt issue

f. RF parameter discrepancy including Neighbor plan

g. Neighboring Cell having quality issues

h. Number of UPBG cards are more or less than required

i. Single PA fault

j. External interference

k. High blocking

l. Planned activities

2. Two Sector degradation

a. Sector Swap

b. Number of UPBG cards are more or less than required


d. High Blocking

e. RF parameter discrepancy including Neighbor plan

f. External interference


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3. All sectors degradation

a. Media Issue at site


c. RF parameter discrepancy including Neighbor pland. External interference

Diagnosis and handling

1.

Single Sector Degradationa. Alarm on RRUs

Check if theres any Quality alarm appearing on RRU, UPBG, FS or CC card and

handle accordingly.

b. Abnormal VSWR

Check in Diagnostics of RRU/RSU, if theres abnormality in VSWR values at PA

then handle accordingly. Following snap shots will help in finding the VSWR test


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Check the configured power for each TRX in Configuration management. It

should be at least 20 Watt each. Following snapshot will help in finding the

configured TRX power


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d. Partial Sector swap

Check onsite if the RF cables and Jumpers are installed correctly and theres no

Partial swap

e. Antenna tilt issue

Perform site Audit, the tilts of antennas should be according to the plan

f. RF parameter discrepancy including Neighbor plan

Issue might be due to incorrect configuration of RF plan and should be verified

with CM and RF teams

g. Neighboring Cell having quality issues

Check the neighboring Cell of the affected Sector for any Quality or availability

issue and handle accordingly


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h. Number of UPBG cards are more or less than required

Each UPBG card is capable of 12 TRXs. If the number of UPBG cards is more or

less than required, delete the unnecessary UPBG card. To check which UPBG card

is serving which TRX, following are the snap shots along with the steps. Delete

the UPBG card which is serving the affected TRXs Start NE Management of the BSC and go to Diagnosis Test

Start the Diagnosis of complete site by clicking the Icon NE Test

Open the Result file

Filter out the GSM Career Frequency in Test type and see which TRXs

are running on which slot of UPBG


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i. Single PA fault

If Some TRXs of one band are degraded and others are not, check whether the

degraded TRXs are running on same RRU. If that RRU has some healthy TRXs as

well, the RRU must be Dual PA. Check if all degraded TRXs belong to one PA then

there is a possibility of hardware fault without any alarm. This is a very rare case.Even if one PA is degraded theres high chance of other factors involved other

than hardware fault. Following are the steps involved to check which TRXs belong

to which PA

Start NE Management of the BSC and go to Diagnosis Test

Start the Diagnosis of complete site by clicking the Icon Ne Test

Open the Result file

Filter out GSM Career Frequency in Test type and see which TRX are

running on which PA of the RRU

If all the degraded TRXs are working on same PA then change the

RRU/RSU

j. External interference

There might be external interference like Jammers etc. affecting the services of

the sector.

k. High blocking

Check hourly stats, if TASR is degraded only when the Traffic is increased and


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blocking occurs at same duration, it is suspected that expansion is required.

Escalate such issues to RF directly

l. Planned activities

Check the issue start date and time in hourly stats. Check from all concerns

department if they have done any planned activity on BSC or BTS side during thedegradation start time. Like for example in some cases after performing CMP

load balancing, a sector of site may be degraded. In such case escalate the issue

to concern department

2.

Two Sector degradation

a. Sector Swap

Check all the RF cables and jumpers, they should be properly installed. Remove

the swap if foundb. Number of UPBG cards are more or less than required

See in previous topic:Number of UPBG cards are more or less than required

c.

Wrong TRX power configuration

See in previous topic:Wrong TRX power configuration

d. High Blocking

Check hourly stats, if TASR is degraded only when the Traffic is increased and

blocking occurs at same duration, it is suspected that expansion is required.

Escalate such issues to RF directly

e.

RF parameter discrepancy including Neighbor plan



f. External interference

There might be external interference like Jammers etc. affecting the services of

the sector

3.

All sectors degradation

a. Media Issue at site

Check for any Packet drops and Clock source or SCTP alarms. Escalate such

issues to TXN team if theres no power issue at site


See Topic:Number of UPBG cards are more or less than required


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c. RF parameter discrepancy including Neighbor plan



d. External interference

There might be external interference like Jammers etc. affecting the services ofthe sector

Joint Visit and escalation to RF

If TASR issue is not resolved by performing above checks, then call Joint Visit and

escalate the issue to RF team for further investigation.

Disclaimer:

Please note that this guide is being drafted purely on the basis of experience in handling

various types of TASR issues nationwide. It might not cover all the possible reasons for

TASR degradation

Documents

TASR Issues Handling Guide (V1.0)