TRX Path-Balance Check Confidentiality:

2012-03-13 Huawei Confidential Page 1 of 10

Document

Name

TRX Path-Balance Check SOP Guideline V1.00

Version V1.00 Effective Date 2010-07-31

Document

Code

L1 Based eTOM

Prepared By L2 Based eTOM

Reviewed By L3 Based eTOM

Approved By L4 Based eTOM

Applicability Global Standard

Roles Analysis engineer

Relevant Process/Regulation

Document Name Document Code

TRX Path-Balance Check Confidentiality:

2012-03-13 Huawei Confidential Page 2 of 10

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 ................................................................ 6

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

TRX Path-Balance Check Confidentiality:

2012-03-13 Huawei Confidential Page 3 of 10

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 Equations

2. Counters used for path-balance Judgment

3. Judgment Criteria

4. Normal Balance Trend

5. Weak UL Trend

6. Weak DL Trend

7. Misleading Case

TRX Path-Balance Check Confidentiality:

2012-03-13 Huawei Confidential Page 4 of 10

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

TRX Path-Balance Check Confidentiality:

2012-03-13 Huawei Confidential Page 5 of 10

BSC 6900 TRX Level Balance Counters UL/DL Path-balance

Diffrence Comment

S462A:Number of MRs (Uplink-and-Downlink Balance Level = 1)(none) X 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

TRX Path-Balance Check Confidentiality:

2012-03-13 Huawei Confidential Page 6 of 10

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 6

2- 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

TRX Path-Balance Check Confidentiality:

2012-03-13 Huawei Confidential Page 7 of 10

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)

TRX Path-Balance Check Confidentiality:

2012-03-13 Huawei Confidential Page 8 of 10

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)

TRX Path-Balance Check Confidentiality:

2012-03-13 Huawei Confidential Page 9 of 10

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 cases

2- 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)

TRX Path-Balance Check Confidentiality:

2012-03-13 Huawei Confidential Page 10 of 10

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)

Version

Prepared/Modified

By

Preparation/Modification

Date

Content/Reason for Modification

Approved

By

V1.00 Mostafa Ibrahim

701891

(Egypt 3rd

licence)

2010.8.31 New Version Zhu

yongsheng

108866