bsc6900 gsm v9r11 traffic statistics issue1
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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:
Understand some often-used traffic measurement items
Locate some problems through the traffic statistics system
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Contents
1. Traffic Statistics Items Analysis Process
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 BSC6900 traffic statistics, some of
them are very important for GSM
optimization, such as:
BSC Measurement
Call Measurement
MR Measurement
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Brief Introduction--BSC Measurement
The measurementobject is “BSC”
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Brief Introduction--Call Measurement
The measurementobject is “GSM Cell
to GSM Cell”
The measurementobject is “Cell”
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Brief Introduction--MR Measurement
The measurementobject is “TRX”
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Contents
1. Traffic Statistics Items Analysis Process
2. Often-used Traffic Statistics Items Analysis
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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
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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
Interference band 2 –105 dBm to –98 dBm
Interference band 3 –98 dBm to –92 dBm
Interference band 4 –92 dBm to –87 dBm
Interference band 5 –87 dBm to –47 dBm
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1-Interference Band Measurement per TRX
InterferenceBand
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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
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2-TCHF(H) Receive Level
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
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2-TCHF(H) Receive Level
Measurement per TRX
…
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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
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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
3-Uplink-and-Downlink BalanceMeasurement per TRX
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Low downlinkRX_LEV
Low uplinkRX_LEV
3-Uplink-and-Downlink BalanceMeasurement per TRX
Uplink-and-Downlink Balance
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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
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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
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5-Neighbor Cell Level Measurement per TRX
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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
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6-KPI Measurement per Cell
KPIMeasurement
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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
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7-Outgoing Inter-cell HandoverMeasurement per Cell
GSM-GSMOutgoing
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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
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8-Incoming Inter-cell Handover Measurement
GSM-GSMIncoming
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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
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9-Intra-cell Handover Measurement per Cell
Intra-cellHandover
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10-Call Drop Measurement per Cell
Call Drop-1
Call Drop-2
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Refer to the notes
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11-AMR Measurement per Cell
AMRMeasuremen
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Summary
Traffic statistics items analysis procedure
The function and usage of key traffic measurement items
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