6-OMO212000 BSC6000 GSM V9R8C12 Traffic Statistics Analysis ISSUE1.00

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


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


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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BTS sensitivity

Diversity gain


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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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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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Thank youwww.huawei.com

6-OMO212000 BSC6000 GSM V9R8C12 Traffic Statistics Analysis ISSUE1.00

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Transcript of 6-OMO212000 BSC6000 GSM V9R8C12 Traffic Statistics Analysis ISSUE1.00