Support Document(s) ................................................................. 10
5
Related Document(s) ................................................................. 10
6
Record Retention .................................................................... 10
7
Document Preparation/Modification Record ............................................ 10
2012-03-13
Huawei Confidential
Page 2 of 10
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. 2. 3. 4. 5. 6. 7.
Link balance Equations Counters used for path-balance Judgment Judgment Criteria Normal Balance Trend Weak UL Trend Weak DL Trend Misleading Case
2012-03-13
Huawei Confidential
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TRX Path-Balance Check
Confidentiality:
Operating Instructions 2.1
2.2
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
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
2012-03-13
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TRX Path-Balance Check
Confidentiality:
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
7)(none)
2
DL > UL
S462H:Number of MRs (Uplink-and-Downlink Balance Level = 8)(none)
5
DL > UL
S462I:Number of MRs (Uplink-and-Downlink Balance Level = 9)(none)
8 < x < 10
DL > UL
11 < x < 14
DL > UL
X => 15
DL > UL
S462G:Number of MRs (Uplink-and-Downlink Balance Level =
S462J:Number of MRs (Uplink-and-Downlink Balance Level = 10)(none) S462K:Number of MRs (Uplink-and-Downlink Balance Level = 11)(none)
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Huawei Confidential
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TRX Path-Balance Check
2.3
Confidentiality:
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
2012-03-13
Huawei Confidential
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TRX Path-Balance Check
2.5
Confidentiality:
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)
2012-03-13
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TRX Path-Balance Check
2.6
Confidentiality:
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)
2012-03-13
Huawei Confidential
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TRX Path-Balance Check
2.7
Confidentiality:
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)
