Path balance check details

1. TRX Path-Balance Check Confidentiality:
2015-06-23 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
PreparedBy 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

2. TRX Path-Balance Check Confidentiality:
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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

3. TRX Path-Balance Check Confidentiality:
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1 Abstract
This documentinstructs engineers how to perform the Base Band Hopping audit.
2 Purpose
This documentaims to standardize the operation procedure of Path-Balance Judgment
1. Linkbalance Equations
2. Countersusedforpath-balance Judgment
3. JudgmentCriteria
4. Normal Balance Trend
5. WeakUL Trend
6. WeakDL Trend
7. MisleadingCase

4. TRX Path-Balance Check Confidentiality:
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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 levelsbelowlevel 6indicatesthe statusof the UL
 The levelsabove level 6indicatesthe statusof the DL
 Level 1 Indicatesthatthe UL > DL by 15
 Level 1 Indicatesthatthe DL > UL by 15

5. TRX Path-Balance Check Confidentiality:
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BSC 6900 TRX Level Balance Counters
UL/DL Path-balance
Diffrence Comment
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

6. TRX Path-Balance Check Confidentiality:
2015-06-23 Huawei Confidential Page 6 of 10
2.3 Judgment Criteria
The criteriausedto judge if the TRX isBalance or not is as following:
1- `Shape of the graph shouldbe centeredonLevel 6
2- Sumof Levels(1+ 2) shouldbe Less Than 20 % fromthe total value of Levels1to 11 (aroundthe
20 %)
3- Sumof Levels(10+ 11) shouldbe LessThan 25 % fromthe total value of Levels1 to 11 (aroundthe
25 %)
2.4 Normal Trend for Path-Balance
The Normal Trend of the balance meansthat the measurementshouldbe aroundlevel 6as shownbelow

7. TRX Path-Balance Check Confidentiality:
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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
isHigherthan 20 % fromthe total Measurement)

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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 Higherthan25 %from the total Measurement)

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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 thatthe TRX suffersfromWeak-ULstatus as shownbelow
So the conclusionfromthiscase isthat:
1- Percentage isjustanindicationtodetermine the worstcases
2- The judgmentmustbe done forcase by case speciallyforthe TRXswithpercentage around20% for
bothUL/DL indicators(Levels1+2or Level 10+11)

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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