Traffic Statistics Analysis
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Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved.
Foreword
Traffic statistics is the performance of network. Each traffic item corresponds to one of the network features. Through the traffic statistics, we can quickly settle the network problem.
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Objectives
Upon completion of this course, you will be able to:
Know the traffic statistics system structure of BSC6000 Understand some often-used traffic measurement items Locate some problems through the traffic statistics system
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Contents1. Brief Introduction to BSC Traffic Statistics 2. Often-used Traffic Statistics Items Analysis
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Performance Measurement Basic
CounterWHAT
Normal counterdefault counterextended counter User-defined counter
ObjectWHO
Physical conceptBoard/Cabinet Logical conceptBSC, Cell, TRX
Period (min)WHEN
5, 15, 30, 60, 1440
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Measurement Counter
Hierarchical structure of performance counters
Function set 1
P E R F O R M A N C E
Function subset 1Counter 1
Function subset m
Counter j
Counter 1
Function set n
Counter k
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Measurement Counter
Function set Counter
Function subset
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Procedure for Performance Query
1. Measurement setting
Counter Object Period
2. Query
By new condition By template
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Measurement Setting
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Measurement SettingPeriod Counter
ObjectThe system automatically issues measurement tasks to the new objects or new NEs
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User-Defined Counter
According to the existent measurement counters, to define a user-required measurement counter by using the arithmetic.
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User-Defined CounterThe existent user-defined counters
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User-Defined CounterPut the constant in parenthesis For example: (Counter1+Counter2)*{100}/(Counter3+Counter4+Counter6) The candidate original counters
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Querying Performance Results
Two kinds of query mode
By new conditions By template
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Querying by New Conditions
Introduce it in the next page This is a userdefined counter
New QueryGrey means this counter is not available
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Querying by New ConditionsSome counters can be queried by Busy Hour
If some objects were deleted, the history results can be queried by this way
After condition setting, we can save it as query template
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Querying by Template
The existent template list
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Other Functions
Abnormal status processing
Browse measurement status Query missing result Manage integrity Synchronize result
Additional functions
Performance counter threshold management
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Browsing Measurement States
Legend
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Querying Missing Result
During the M2000 running, measurement results may be missing due to many reasons, such as the disconnection of NEs from the M2000 within a period of time. If measurement results are lost, you can synchronize the measurement
results to obtain the missingresults.Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page20
Querying Missing Result
The missing information
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Managing Integrity
Integrity management includes two parts: integrity monitor and integrity query.
Integrity monitor:
Querying the integrity of current results
Integrity query:
Querying the integrity of historical results
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Integrity Monitor
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Integrity Monitor
A maximum of 5 measurement periods, 10 NEs, and 10 function subsets are allowed.
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Integrity Query
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Integrity Query
A maximum of 5 measurement periods, 10 NEs, and 10 function subsets are allowed.
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Synchronizing Measurement Results
To obtain the missing measurement results by synchronizing
measurement results.
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Synchronizing Measurement Results
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Performance Counter Threshold
Benefits
Monitor the actual measurement result of the counters. When the
value of the measurement result exceeds that threshold set by theuser, the system generates an alarm.
Types:
Simple threshold
The threshold defined for a single counter
Combined threshold
The threshold defined for the value obtained by logic or arithmetic
operations of multiple counter values.
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Simple Threshold
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Threshold Alarm
Higher the value, worse the circumstanceCritical Alarm
110 100 90Minor Alarm Critical Alarm Cleared
45 40
35t1 t2 t3 t4 t5 t6 t7
Minor Alarm Cleared
t8 t9
t10 t11 t12Page31
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Threshold Alarm
Lower the value, worse the circumstanceMinor Alarm Cleared
110 100 90Critical Alarm ClearedMinor Alarm
45 40Critical Alarm
35t1 t2 t3 t4 t5 t6 t7 t8 t9Page32
t10
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Combined Threshold
Set the formulas as the next page
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Combined Threshold
Logic combination
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Contents1. Brief Introduction to BSC Traffic Statistics 2. Often-used Traffic Statistics Items Analysis
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Analysis Process
Systematical logic
From whole system to specific cell
Integrality
Observe the change trend of the items for more than one week and the changing trend of each day.
Relativity
Relationship between various kinds of traffic statistics items
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Brief Introduction
There are 28 measurement clusters in the BSC6000 traffic statistics, some of
them are very important for GSMoptimization, such as:
BSC Measurement Call Measurement MR Measurement
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Brief Introduction--BSC Measurement
The measurement object is BSC
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Brief Introduction--Call MeasurementThe measurement object is GSM Cell to GSM Cell
The measurement object is Cell
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Brief Introduction--MR Measurement
The measurement object is TRX
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Often-used Items
In BSC6000, there are some measurement units are important for the analysis of interference, call drop and handover, so more attention should be paid on those:
Interference band measurement per TRX TCHF(H) receive level measurement per TRX Power control messages per cell Neighbor Cell Level Measurement per cell Uplink-and-downlink balance measurement per TRX Radio link failure measurement per TRX
Radio link failure measurement based on TA per TRX
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Often-used Items
In BSC6000, there are some measurement units are important for the analysis of interference, call drop and
handover, so more attention should be paid on those:
KPI measurement per Cell Outgoing internal/external inter-cell handover measurement per cell Incoming internal/external inter-cell handover measurement per cell Intra-cell handover measurement per cell Call drop measurement per cell AMR Measurement per cell
CPU usage measurement
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Interference Band Measurement per TRX
Interference band is the interference level contained in theInterference Band Default Power Level Range110 dBm to 105 dBm 105 dBm to 98 dBm 98 dBm to 92 dBm 92 dBm to 87 dBm 87 dBm to 47 dBm
RF RES IND message that the BTSreports to the BSC when the channel is idle. There are five levels. The level range of each band is set
Interference band 1
Interference band 2
Interference band 3
through the LMT. The higher ranksuggests higher interference level. Normally an idle channel at interference band 4 or 5 suggests the existence of interference.
Interference band 4
Interference band 5
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Interference Band Measurement per TRX
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TCHF(H) Receive Level Measurement per TRX
The valid MRs that the BSC receives contain the ranks of the uplink and downlink receive level and the ranks of the
uplink and downlink receive quality
The receive level has eight ranks, and higher rank suggests greater receive level
The receive quality has eight ranks, and higher ranksuggests worse receive quality
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TCHF(H) Receive Level Measurement per TRXRank of Receive Level 0 1 2 Receive Level (dBm) 100 (-100,95] (-95,-90]
3 45 6 7
(-90,-85] (-85,-80](-80,-75] (-75,-70] -70
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TCHF(H) Receive Level Measurement per TRX
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Power Control Messages per CellLower average transmit power level suggests higher transmit powerHigher average signal level suggests higher signal strength Lower rank suggests better quality
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Power Control Messages per CellGreat value suggests poor coverage/bad quality area, or improper settings of power control parameters
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Neighbor Cell Level Measurement per TRX
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Uplink-and-Downlink Balance Measurement per TRX
Proper power estimation during network planning is a prerequisitefor normal operation of the system. The uplink and downlink signals in the coverage area should be balanced.
The MR that the BSC receives contains the uplink receive level and the downlink receive level. The uplink and downlink balance level is determined by the following formula:
RX_LEV_DL RX_LEV_UL X
X: Indicated the receiving sensitivity between MS and BTS
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Uplink-and-Downlink Balance Measurement per TRX
BTS sensitivity
Diversity gain
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Uplink-and-Downlink Balance Measurement per TRX
Low downlink RX_LEV
Low uplink RX_LEV
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Uplink-and-Downlink Balance Measurement per TRXUplink-and-Downlink Balance Rank1 2 3 4 5 6 7 8 9 10 11 RX_LEV_DL RX_LEV_UL X 15 dB 14 dB, 13 dB, 12 dB, 11 dB, 10 dB 9 dB, 8 dB, 7 dB, 6 dB 5 dB, 4 dB, 3 dB 2 dB, 1dB 0 dB 1 dB, 2 dB 3 dB, 4 dB, 5 dB 6 dB, 7 dB, 8 dB, 9 dB 10 dB, 11 dB, 12 dB, 13 dB, 14 dB 15 dB
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Radio Link Failure Measurement per TRX
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Radio Link Failure Measurement per TRX
Check receive level, quality and TA in Radio Link Failure Measurement per TRX to analysis the call drop type:
Edge call drop: low receiving signal strength, and large TA. Short distance call drop: low receiving signal strength and small TA.
Interference call drop: high receiving signal strength and poor quality.
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Edge Call Drop
Causes MS is out of cells effective coverage area, Island phenomenon caused by over shooting or missing neighbor, Isolated site.
Solutions
Add new site to guarantee the effective continuous coverage; Add the necessary neighbor;
Adjust antenna height and antenna downtilt, use high gain antenna;Modify some parameters
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Short Distance Call Drop
Causes
Poor coverage caused by complicated terrain or high dense building
Solutions
Increase EIRP Adjust antenna direction and downtilt, make the main lobe point to high traffic area
Adjust parameters related to call drop
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Interference Call Drop
Monitor and locate interference through some traffic statistics
Analysis interference band to monitor uplink interference,judging inter network or intra network interference according the relationship between interference and traffic Monitor uplink and downlink interference via TCHF(H) receive level measurement. If most M.R receive level high and the quality bad, the interference will be serious In BTS Maintenance-Maintain Cell-Configure/Query Frequency Scan , can monitor which frequency is interfered
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Interference Call Drop
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Interference Call Drop
Solutions
Drive test in the suspected area, check the receive level and the quality; using the spectrum equipment to find out the interference resource.
Active frequency hopping, DTX and the Power control to reduce the interference.
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Radio Link Failure Measurement based on TA per TRX
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KPI Measurement per Cell
KPI measurement is about the traffic statistics of each cell, it includes all the important items, helping the engineer analyze each cell performance
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Outgoing Inter-cell Handover Measurement per Cell
This measurement refers to performance of MS handover from target cell to the each neighbor cell, including Handover request times, handover success times, radio handover success rate
It also record the handover reason, such as receive level , bad quality, better cell, TA, receive level drop, enhance dual band cell
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Outgoing Inter-cell Handover Measurement per Cell
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Incoming Inter-cell Handover Measurement per Cell
This measurement refers to performance of MS handover from each neighbor cell to this serving cell, including Handover request times, handover success times, radio handover success rate
From the incoming inter-cell handover measurement, can locate the neighbor cell which handover to this cell is not good
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Incoming Inter-cell Handover Measurement
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Intra-cell Handover Measurement per Cell
It measures the intra-cell handover request times, success times.
This traffic unit also measure the reasons of intra-cell handover: interference intra-cell handover, TCHF-TCHH in the AMR calling, intra-cell handover during the channel conversion, overlaid/underlaid handover.
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Intra-cell Handover Measurement per Cell
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Call Drop Measurement per Cell
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AMR Measurement per Cell
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CPU Usage Measurement
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Summary
Traffic Statistics System Basics Key Traffic Measurement Items
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