TRX Path-Balance Check Confidentiality:

Document

NameTRX Path-Balance Check SOP Guideline V1.00

Version V1.00 Effective Date 2010-07-31

Document

CodeL1

Based eTOM

Prepared By L2Based eTOM

Reviewed By L3Based eTOM

Approved By L4Based eTOM

Applicability Global Standard

RolesAnalysis engineer

Relevant Process/Regulation

Document Name Document Code

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TRX Path-Balance Check Confidentiality:

Contents

Relevant Process/Regulation.....................................................................................................1

1 Abstract.........................................................................................................................3

2 Purpose..........................................................................................................................3

Operating Instructions.........................................................................................................4

2.1 Link Balance Equations:.........................................................................................4

2.2 Counters used for path-balance Judgment..............................................................4

2.3 Judgment Criteria...................................................................................................5

2.4 Normal Trend for Path-Balance..............................................................................6

2.5 Weak DL Trend for Path-Balance............................................................................7

2.6 Weak UL Trend for Path-Balance............................................................................8

2.7 Misleading Case for Path-Balance..........................................................................9

3 Appendix......................................................................................................................10

4 Support Document(s)...................................................................................................10

5 Related Document(s)...................................................................................................10

6 Record Retention.........................................................................................................10

7 Document Preparation/Modification Record...............................................................10

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TRX Path-Balance Check Confidentiality:

1 Abstract

This document instructs engineers how to perform the Base Band Hopping audit.

2 Purpose

This document aims to standardize the operation procedure of Path-Balance Judgment

1. Link balance Equations2. Counters used for path-balance Judgment3. Judgment Criteria4. Normal Balance Trend5. Weak UL Trend6. Weak DL Trend7. Misleading Case

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TRX Path-Balance Check Confidentiality:

Operating Instructions

2.1 Link Balance Equations:

UL/DL Path balance difference = UL path loss - DL path loss = (MS real transmit power-UL Rx_Lev) - (BTS cabinet output power-DL Rx_Lev).

BTS cabinet output power=TRX power-static power class*2 + Power fine tuning - Combiner loss - DL dynamic PC level*2 + dynamic PBT gain

2.2 Counters used for path-balance Judgment

The below counters define the balance status of the TRX into 11 levels and the balance should be around level 6

The levels below level 6 indicates the status of the UL The levels above level 6 indicates the status of the DL Level 1 Indicates that the UL > DL by 15 Level 1 Indicates that the DL > UL by 15

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TRX Path-Balance Check Confidentiality:

BSC 6900 TRX Level Balance CountersUL/DL Path-balance

Diffrence

Commen

t

S462A:Number of MRs (Uplink-and-Downlink Balance Level = 1)

(none) X <= -15 UL > DL

S462B:Number of MRs (Uplink-and-Downlink Balance Level = 2)

(none) -14 < x < -11 UL > DL

S462C:Number of MRs (Uplink-and-Downlink Balance Level = 3)

(none) -10 < x < -8 UL > DL

S462D:Number of MRs (Uplink-and-Downlink Balance Level = 4)

(none) -7 < x < -5 UL > DL

S462E:Number of MRs (Uplink-and-Downlink Balance Level = 5)

(none) -4 < x < -2 UL > DL

S462F:Number of MRs (Uplink-and-Downlink Balance Level = 6)

(none) -1 < x < 1 Balance

S462G:Number of MRs (Uplink-and-Downlink Balance Level = 7)

(none) 2 < x < 4 DL > UL

S462H:Number of MRs (Uplink-and-Downlink Balance Level = 8)

(none) 5 < x < 7 DL > UL

S462I:Number of MRs (Uplink-and-Downlink Balance Level = 9)

(none) 8 < x < 10 DL > UL

S462J:Number of MRs (Uplink-and-Downlink Balance Level = 10)

(none) 11 < x < 14 DL > UL

S462K:Number of MRs (Uplink-and-Downlink Balance Level = 11)

(none) X => 15 DL > UL

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TRX Path-Balance Check Confidentiality:

2.3 Judgment Criteria

The criteria used to judge if the TRX is Balance or not is as following:

1- `Shape of the graph should be centered on Level 62- Sum of Levels (1 + 2) should be Less Than 20 % from the total value of Levels 1 to 11 (around the 20

%)3- Sum of Levels (10 + 11) should be Less Than 25 % from the total value of Levels 1 to 11 (around the

25 %)

2.4 Normal Trend for Path-Balance

The Normal Trend of the balance means that the measurement should be around level 6 as shown below

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TRX Path-Balance Check Confidentiality:

2.5 Weak DL Trend for Path-Balance

Weak DL means that the measurement of the UL Level counters is higher than the DL counters (Levels 1+2 is Higher than 20 % from the total Measurement)

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TRX Path-Balance Check Confidentiality:

2.6 Weak UL Trend for Path-Balance

Weak DL means that the measurement of the DL Level counters is higher than the UL counters (Levels 10+11 is Higher than 25 % from the total Measurement)

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TRX Path-Balance Check Confidentiality:

2.7 Misleading Case for Path-Balance

In the below case the measurement of Levels 10+11 is 22% which is good and accepted but from the TRX chart we can see that the TRX suffers from Weak-UL status as shown below

So the conclusion from this case is that:

1- Percentage is just an indication to determine the worst cases2- The judgment must be done for case by case specially for the TRXs with percentage around 20% for

both UL/DL indicators (Levels 1+2 or Level 10+11)

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TRX Path-Balance Check Confidentiality:

3 Appendix

Not Required

4 Support Document(s)

No. Document name Document code

1.

5 Related Document(s)

Front-end and Back-end Document name Document Code

6 Record Retention

Record

Name

Hand over

Owner

Retention

Owner

Retention

Location

Filing Date Retention

Period

Disposition at

Expiry

Problem

escalation

(GCRMS)

7 Document Preparation/Modification Record

(Manda tory)

Versio

n

Prepared/Modified

By

Preparation/Modification

DateContent/Reason for Modification

Approved

By

V1.00 Mostafa Ibrahim

701891

(Egypt 3rd licence)

2010.8.31 New Version Zhu

yongsheng

108866

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