7 OMF800603 Traffic Statistics Analysis ISSUE1.0

8/12/2019 7 OMF800603 Traffic Statistics Analysis ISSUE1.0

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Copyright © 2008 Huawei Technologies Co., Ltd. All rights reserved.

Traffic Statistics Analysis



Copyright © 2008 Huawei Technologies Co., Ltd. All rights reserved. Page1

Foreword

Traffic statistics is the performance of network.

Each traffic item is corresponding one feature of network.

Through the traffic statistics, can quickly settle the network

problem.




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




Contents

1. Brief Introduction to BSC Traffic Statistics

2. Often-used Traffic Statistics Items Analysis

3. Locate Problem through Traffic Analysis




Measurement term

Counter WHAT

Normal counter ：default counter ＋extended counter

Customer counter

Object WHO

Physical concept（Board/Cabinet）

Logical concept（BSC, Cell，TRX）

Period WHEN

5，15，30，60，1440（min）




Hierarchical Structure of Performance

Unit m

Unit 1

Cluster 1

… …

…

… Cluster n

Item 1

Item j

Item1

Item k

P

E

R

FO

R

M

A

N

C

E




Hierarchical Structure of Performance

Cluster

Unit

Counter




Managing Objects and counters





Counter

Period

Object




Object Type

Object TypeReport all

the KPI

Save in the

performance data base

Could

be query

Class 1 Yes Yes Yes

Class 2 Optional Optional Optional




Measurement Period

Period

A measurement period refers to the interval for NEs to report

performance measurement results. It define how to measure.

The measurement periods vary according to the measurementobjects.

The following measurement periods are available:

5 minutes, 15minutes, 30 minutes, 60 minutes, or 24 hours.




User-Defined Counter

According to the existing measurement counters, to define a

user-required measurement counter by using the arithmetic.




Adding a User-Defined Counter




Managing Measurement States




Querying Missing Results

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 missing

results.




Synchronizing Measurement Results

To obtain the missing measurement results by synchronizing

measurement results.




Synchronizing Measurement Results




Integrity Management

Integrity management includes two parts: integrity monitor

and integrity query.

Integrity monitor: monitoring the integrity of measurement

results refers to checking the integrity of measurement results

in a measurement period before the current time.

Integrity query: you can query the integrity of historical

measurement results.




Integrity Monitor




Integrity Monitor

A maximum of 5 measurement periods, 10 NEs, and 10

function subsets are allowed.




Integrity Query




Integrity Query

A maximum of 5 measurement periods, 10 NEs, and 10

function subsets are allowed.




Querying Performance Results

Two query modes

by new conditions

by template




Querying by new conditions

New Query




Querying by template




Managing Result Query Templates




Displaying Performance Results

Measurement results can be displayed in a table or a line orbar chart.




Printing Performance Results




Performance Counter Thresholds

The performance threshold is used to monitor the actual

measurement result of the performance counter. When the

value ofthe measurement result exceeds that set by the

user, the system generates an alarm.

The threshold value of the performance counter can be the

threshold value of a specific performance counter or the

threshold value of the combined performance counters.




Setting Simple Counter Threshold

Simple threshold is a threshold defined for a single counter.




Threshold Alarm




Activate/Deactivate Counter

Threshold Suspend a threshold when it is not used temporarily, and

then activate it if required.




Setting Combined Counter Threshold

Combined threshold indicates setting the threshold value forthe counters after logic or arithmetic operations.




Contents







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




Analysis Process

Analysis process

First we shall analyze and compare the item of BSC

measurement function to have a rough idea for the

whole network.

During analyzing, if any important items (such as call

drop rate or handover success rate) are abnormal,

we shall do further detailed analysis for the

corresponding items.




Analysis Process

There are 26 clusters in the

BSC6000 traffic statistics, 4 of them

are important for the optimization.

BSC Measurement

MR Measurement

Call Measurement

Channel Measurement




Traffic Analysis

The statistic items in BSC

Measurement Function

are used to measure the

traffic volume of all the

cells in the BSC, including

the call drop, handover

and assignment.




Traffic Analysis

Channel measurement is

about the channel allocated,

channel conversion and the

channel load




Often-used Items

In BSC6000, there are some traffic units are important for

the analysis of interference, call drop and handover, more

attention should be paid on those

Interference band measurement report 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

TCHF(H) receive level measurement per TRX




Often-used Items

In BSC6000, there are some traffic units are important for

the analysis of interference, call drop and handover, more

attention should be paid on those

KPI measurement per cell

Outgoing inter-cell handover measurement per cell

Incoming inter-cell handover measurement per cell

Intra-cell Handover Measurement

Call drop measurement per cell

CPU usage measurement




CPU Usage Measurement

CPU measurement function includes two statistic items:

Percentage of CPU occupation (%)

Peak percentage of CPU occupation (%)

The former one is the percentage of CPU in busy statusduring the measurement cycle. This item indicates the

load of BSC. The latter one is the maximum CPU

occupation within measurement cycle

It is recommended to register this task on any occasion




CPU Usage Measurement




Interference Band Measurement Report

Interference Band Power Level Range

Interference band 1 –105 dBm to –98 dBm





Interference band is the interferencelevel contained in the RF RES IND

message that the BTS reports to the

BSC when the channel is idle. There

are five levels. The level range of

each band is set through the LMT.

The higher rank suggests higher

interference level. An idle channel at

interference band 4 or 5 suggests

the existence of interference.




TCHF(H) Receive Level Measurement

Rank of Receive Level Receive Level(dBm)

0 < –100

1 (-100,85]

2 (-85,-80]

3 (-80,-75]

4 (-75,-70]

5 (-70,-65]

6 (-65,-60]

7 >-60




Outgoing Inter-cell Handover Measurement




Incoming Inter-cell Handover Measurement

This measurement refers to performance of MShandover 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.




Incoming Inter-cell Handover Measurement





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-TCHHin the AMR calling, intra-cell handover during the channel

conversion, overlaid/underlaid handover.




Uplink-and-Downlink Balance Measurement

Uplink-and-Downlink

Balance Rank Downlink Receive Level – Uplink Receive level – 6

1 – 15 dB

2 – 14 dB, – 13 dB, – 12 dB, – 11 dB, – 10 dB

3 – 9 dB, – 8 dB, – 7 dB, – 6 dB

4 – 5 dB, – 4 dB, – 3 dB

5 – 2 dB, – 1dB, 0 dB

6 0 dB

7 1 dB, 2 dB

8 3 dB, 4 dB, 5 dB

9 6 dB, 7 dB, 8 dB, 9 dB

10 10 dB, 11 dB, 12 dB, 13 dB, 14 dB

11 15 dB, 16 dB, 17 dB, 18 dB, 19 dB, 20 dB

• Mapping between the uplink/downlink balance rank and the

receive level.



Call Drop Measurement




AMR Measurement

The BSC measures these counters when receiving theSETUP or CALL CONFIRMED message that contains the

speech version.

It indicates penetration of AMR MS.




Contents







Call Drop Analysis

High call drop cell

Radio link failure Call drop measurement

Rx-level

quality

TA

Call drop during the H.O

Call drop in stable state

drop due to the Abis interface

drop due to the equipment

drop due to forced H.O

alarm、hardware

Interference band

Up-down link balance




Call Drop Analysis

Call drop in stable state: call drop during the calling, the major

reasons are “error indication” and “connect failure”.

Call drop in handover state: call drop during handover, in other

word , handover failure and reset-up also failure.

Call drop due to Abis terrestrial link failure: normally the reason is Abis transmission, also can check alarm system to find out this

problem.

Call drop due to equipment failure: the call drop reason is related

to hardware fault.

Call drop due to force handover: during the calling, system force

the MS handover and handover failure , call drop occur.




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

I t f C ll D




Interference Call Drop

Monitor and locate interference through some trafficstatistics：

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 frequency

scan” , can monitor which frequency is interfered

I t f C ll D





I t f C ll D





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.

U d Li k B l




Up-down Link Balance

Disposing method：

Analyze “up-down link balance measurement function”

statistics result and confirm whether the uplink and downlink

are balanced.

In call drop measurement function, analyze the average

receiving signal strength and quality for both the uplink and

downlink .

In power control measurement function, analyze the averagereceiving signal strength for both the uplink and downlink .

H d A l i P




Handover Analysis Process

Low handover success rate

Alarm hardware

Interference band

Up-down link balance

Incoming H.O

Outgoing H.O

Neighbor cell level

KPI measurement

External inter-cell

Handover

Internal inter-cell

Handover

Intra cell H.O

H d A l i




Handover Analysis

Find out the problem cells: All cells or some cells

Handover problem direction:

Outgoing or incoming

Handover failure object:

Handover to all the neighbor cells or just handover to certain

cell has problem

H d A l i




Handover Analysis

From “KPI measurement” and “External inter -cell handover”“Internal inter -cell handover”, find out the cells which handover

success rate is lower

Analysis the major handover failure is in outgoing or incoming

Check “Incoming and outgoing handover measurement” to find out

it is just related to certain cell or to all the neighbor cells

From “neighbor cell revel” to decide deleting or adding neighbor

cell

Check “Intra-cell handover measurement” to monitor AMR,

overlaid/underlaid performance



H d P t




Handover Parameters

Locate and solution：

Check whether the handover threshold such as TA, BQ and handover

function switch are suitable or not.

Check whether the successful TCH seizures for handover are much

more than successful TCH seizures for call. If handover times divided

by call times is larger than 3, then it indicates that there may be ping-

pong handover. Check the parameter settings and adjust them (layer

setting, layer handover hysteresis, inter cell handover hysteresis, PBGT

threshold, etc.).

Check whether the average signal strength is low when the handover

happens. If so, it indicates the edge handover threshold is too low.



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7 OMF800603 Traffic Statistics Analysis ISSUE1.0

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