bsc6900 gsm v9r11 traffic statistics issue1

7/30/2019 BSC6900 GSM V9R11 Traffic Statistics ISSUE1

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Copyright ©2010 Huawei Technologies Co., Ltd. All rights reserved. Page1

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.




Objectives

Upon completion of this course, you will be able to:

Understand some often-used traffic measurement items

Locate some problems through the traffic statistics system




Contents

1. Traffic Statistics Items Analysis Process

2. Often-used Traffic Statistics Items Analysis




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




Brief Introduction

There are 28 measurement clusters in

the BSC6900 traffic statistics, some of

them are very important for GSM

optimization, such as:

BSC Measurement

Call Measurement

MR Measurement




Brief Introduction--BSC Measurement

The measurementobject is “BSC”




Brief Introduction--Call Measurement

The measurementobject is “GSM Cell

to GSM Cell”

The measurementobject is “Cell”




Brief Introduction--MR Measurement

The measurementobject is “TRX”




Contents

1. Traffic Statistics Items Analysis Process

2. Often-used Traffic Statistics Items Analysis




3

Often-used Traffic Statistics Items

Interference band measurement1In BSC6900,there aresomemeasurementunits which

are importantfor theanalysis of interference,call drop andhandover, somore

attentionshould bepaid on them

per TRX2 TCHF(H) receive level measurement

Uplink-and-downlink balance measurement

4

5

6

Power control messages per cell

7

Neighbor Cell Level Measurement per cell

8

KPI measurement

9

Outgoing internal/external inter-cell handovermeasurement per cell

10

Incoming internal/external inter-cell handovermeasurement per cell

11

Intra-cell handover measurement per cell

Call drop measurement per cell

AMR Measurement per cell

per CELL




1-Interference Band Measurement per TRX

Interference band is the

interference level 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.

Normally an idle channel at

interference band 4 or 5 suggests

the existence of interference.

Interference Band Default Power Level Range

Interference band 1 –110 dBm to –105 dBm








1-Interference Band Measurement per TRX

InterferenceBand




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 rank

suggests worse receive quality

2-TCHF(H) Receive Level

Measurement per TRX





Measurement per TRXRank of Receive Level Receive Level (dBm)

0 ≤–100

1 (-100,95]

2 (-95,-90]

3 (-90,-85]

4 (-85,-80]

5 (-80,-75]

6 (-75,-70]

7 ＞-70

TCHF ReceiveLevel Measurement

TCHH ReceiveLevel Measurement





Measurement per TRX

…




Proper power estimation during network planning is a prerequisite

for 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:

Uplink/Downlink balance = Uplink path loss - Downlink path loss

= (Actual TX power of the UE - Uplink receive level) - (TRX power on topof the cabinet - Downlink receive level)

3-Uplink-and-Downlink BalanceMeasurement per TRX




Uplink/Downlink Balance Uplink path loss - Downlink path loss

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

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





Low downlinkRX_LEV

Low uplinkRX_LEV


Uplink-and-Downlink Balance




4-Power Control Messages per Cell

Lower average transmitpower level suggestshigher transmit power

Higher average signal

level suggests highersignal strength

Lower rank suggestsbetter quality

Great value suggests poorcoverage/bad quality area,

or improper settings of power control parameters

PowerControl Messages




5-Neighbor Cell Level Measurement per TRX

The neighbor cell can be classified into two types

Defined neighbor cell

Refers to the cell whose BCCH frequency is contained in the BA

table of the BSC and that is configured as a neighbor cell of the

present cell in the neighbor relation list

Undefined neighbor cell

Refers to the cell whose BCCH frequency is contained in the BA

table of the BSC (manually added by the user) but that is not

configured as a neighbor cell of the present cell in the neighbor

relation list




5-Neighbor Cell Level Measurement per TRX




6-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




6-KPI Measurement per Cell

KPIMeasurement




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

7-Outgoing Inter-cell HandoverMeasurement per Cell




7-Outgoing Inter-cell HandoverMeasurement per Cell

GSM-GSMOutgoing




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

8-Incoming Inter-cell HandoverMeasurement per Cell




8-Incoming Inter-cell Handover Measurement

GSM-GSMIncoming




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.

9-Intra-cell Handover Measurement per Cell




9-Intra-cell Handover Measurement per Cell

Intra-cellHandover




10-Call Drop Measurement per Cell

Call Drop-1

Call Drop-2




Refer to the notes




11-AMR Measurement per Cell

AMRMeasuremen




Summary

Traffic statistics items analysis procedure

The function and usage of key traffic measurement items



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bsc6900 gsm v9r11 traffic statistics issue1

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