03 gsm bss network kpi (sdcch congestion rate) optimization manual

GSM BSS Network KPI (SDCCH Congestion Rate)
Optimization Manual
INTERNAL
BOM Code Product Name GSM BSC
Confidentiality
Level
INTERNAL Product
Version
V1.1
Compiling
Department
Document
Version
Total 31 pages
GSM BSS Network KPI (SDCCH Congestion Rate) Optimization Manual
(For internal use only)
Prepared by GSM&UMTS Network
Performance Research
Department
Date 2008-05-19
2014-06-18 HUAWEI Confidential Page1, Total18

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Yang Chunjie
Reviewed by Date
Reviewed by Date
>Approved
by
Date
Huawei Technologies Co., Ltd.
All rights reserved

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Revision Record
Date Revision
Version
Description Author
2008-05-19 V1.0 Draft completed Yang Chunjie
00119951
2008-06-02 V1.0 Adjust the sequence of
problem location and
add some suggestions of
adjusting the related
parameters affecting
SDCCH congestion rate
according to the advices
of the experts in our
team and the experts of
network optimization
and planning.
Yang Chunjie
00119951
References
Num
ber
Reference Author Date
1 Guide to Optimization of SDCCH
Congestion Rate
Wang Weiji,
Yang Haiquan
2006-12-20
2 Baseline Specification of GSM BSS
Network KPI (SDCCH Congestion
Rate)
Wu Zhen 2007-04-09

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Contents
1 Principles of SDCCH Congestion Rate .....................................................................5
1.1 Definition..............................................................................................................................5
1.2 SDCCH Seizure.....................................................................................................................6
1.3 Signaling Procedure and Measurement Points.....................................................................6
2 Factors of SDCCH Congestion Rate in GSM.............................................................6
2.1 Congestion Caused by Faults on Equipment or Transmission.............................................6
2.2 Congestion Caused by Insufficient Signaling Resources.....................................................7
2.3 Congestion Caused by Improper Data Configuration..........................................................7
2.4 Congestion Caused by Interference......................................................................................7
3 Optimazation Method of SDCCH Congestion............................................................7
3.1 Analysis Procedure of SDCCH Congestion Rate.................................................................7
3.2 Optimazation Method of SDCCH Congestion Rate.............................................................9
3.2.1 Checking Hardware....................................................................................................9
3.2.2 Checking Channel Configuration..............................................................................9
3.2.3 Checking Data Configuration..................................................................................11
3.2.4 Checking the Um Interface......................................................................................12
4 Test Method...............................................................................................................13
5 Case Analysis of SDCCH Congestion Rate..............................................................14
5.1 Congestion Caused by Improper Configuration of Power.................................................14
5.2 SDCCH Congesiton Caused by Improper Configuration of LAC.....................................14
6 Feedbacks on High SDCCH Congestion Rate..........................................................15
Appendix Relevant Traffic Counters to BSC6000 SDCCH Congestion Rate...........16

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SDCCH Congestion Rate Optimization Manual
Keywords: SDCCH Congestion Rate
Abstract: This document introduces the definition and optimization method of
SDCCH congestion rate.
Abbreviations:
Abbreviation Full Spelling
SDCCH Stand-alone Dedicated Control Channel
1 Principles of SDCCH Congestion Rate
SDCCH congestion rate is one of the important counters that indicate
accessibility in circuit service. This counter provides the ratio of failed SDCCH
seizures due to busy SDCCH to the total requests for the SDCCH. SDCCH
congestion rate indicates the failed requests for the SDCCH for various reasons.
SDCCH congestion rate also indicates the status of the SDCCH resource
utilization.
1.1 Definition
The Huawei definition and formula of SDCCH congestion rate are as follows:
• Definition:
Ratio of failed SDCCH seizures due to busy SDCCH to the total requests for
the SDCCH
• Formula:
SDCCH congestion rate = Failed SDCCH seizures due to busy SDCCH/Total
requests for the SDCCH x 100%
Failed SDCCH Seizures due to Busy SDCCH = [Failed Immediate
Assignment due to Busy Channels or Failed Configurations (SDCCH)] + [Failed
Internal Inter-cell Handovers (No Channel Available) (SDCCH)] + [Failed Incoming
Internal Inter-cell Handovers (No Channel Available) (SDCCH)] + [Failed Incoming

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External Handovers (No Channel Available) (SDCCH)]
1.2 SDCCH Seizure
The requests for the SDCCH in GSM are mainly made in the following two
procedures:
A. The procedure for requesting the SDCCH for services such as point-to-point
calls, location updating (only SDCCH), call re-establishment, or short
messages;
B. he procedure of SDCCH handovers (including both the intra-BSC and inter-
BSC handovers)
1.3 Signaling Procedure and Measurement Points
C ha nnel Reque st
C ha nne lRequired
C ha nne l AC T
C ha nne l AC TAC K
Imme dia te a ssignme nt C omma nd
MS BTS BSC
A1
B1
Figure 1 SDCCH requests and failed SDCCH requests due to busy
SDCCH in the immediate assignment procedure
A1: Immediate Assignment Requests
B1: Failed Immediate Channel Assignment due to Busy SDCCHs or Failed
SDCCH Configurations
For details, refer to the Baseline Specification of GSM BSS Network KPI
(SDCCH Congestion Rate).
2 Factors of SDCCH Congestion Rate in GSM
2.1 Congestion Caused by Faults on Equipment or Transmission
The faults on BTS, BSC, and Abis interface, such as broken LAPD link, cause
the SDCCH congestion. The alarm "Excessive Loss of E1/T1 Signals in an Hour" also
causes the SDCCH congestion.

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2.2 Congestion Caused by Insufficient Signaling Resources
The heavy traffic and burst traffic cause the SDCCH congestion. Proper setting
of the number of SDCCHs and TCHs, and the SDCCH dynamic conversion function
can relieve the congestion.
2.3 Congestion Caused by Improper Data Configuration
The SDCCH congestion relates to the relevant parameters of the BSC such as
SDCCH Availability, LAC and T3101 (the timer used in the immediate assignment
procedure), and T3212 (the timer used for periodic updating). If these parameters are
set correctly, the SDCCH congestion can be relieved. In addition, if the assignment
procedure is set to Late Assignment, the time of the SDCCH being occupied
increases, which may lead to congestion.
2.4 Congestion Caused by Interference
Interference on the Um interface also causes congestion. For example, if the
main BCCH in the serving cell and the TCH in the neighboring cell share the same
TRX frequency and BTS BSIC, the handover access on this TCH may be mistaken as
random access. As a result, the SDCCH is abnormally allocated and congestion
occurs. The excessive receive sensibility can also make the interference signal
mistaken as access signal, which leads to congestion.
3 Optimazation Method of SDCCH Congestion
3.1 Analysis Procedure of SDCCH Congestion Rate
SDCCH congestion rate is classified into BSC-level and cell-level according to
the statistic object of the counter. The SDCCH congestion rate of a BSC is composed
of the SDCCH congestion rate of a series of cells.
Compared with the SDCCH congestion rate of the competitors, the Huawei
SDCCH congestion rate cannot exclude the congestion in the handover procedure.
Few networks are enabled with the function of SDCCH handover; therefore, the
formula of SDCCH congestion rate of Huawei is almost the same as that of the
competitors.
Procedure of SDCCH congestion rate analysis

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Figure 2 Procedure of SDCCH congestion rate analyses
First, determine the level of the SDCCH congestion rate. If the congestion occurs
in a large area, check the traffic volume and the setting of T3212. Then, calculate the
SDCCH capacity to check whether it meets the system demand and whether the faults
exist on system-level equipment or transmission. If congestion occurs in only a few
cells, check the hardware, data configuration, and Um interface quality of the cell.
3.2 Optimazation Method of SDCCH Congestion Rate
3.2.1 Checking Hardware
Faults on the TRX, BTS, and transmission may cause SDCCH congestion.
To see whether there are faults on the hardware, query the alarms of transmission,
board communication, CDU VSWR, and clock. In addition, query transmission-
related traffic counters such as the CRC frames received by the BTS on the LAPD
link in the LAPD performance measurement.
3.2.2 Checking Channel Configuration
Query the traffic statistics to see whether the traffic volume on the SDCCH and
TCH are higher than the normal value. If the congestion is caused by excessive traffic
on the SDCCH, for multi-TRX BTSs, enable SDCCH dynamic allocation function or
increase the number of SDCCH channels to relieve the congestion. For cells with only
one TRX or without extra channels, enable the very early immediate assignment
procedure. In the very early immediate assignment procedure, the TCH channel is
immediately assigned when the SDCCH has no available resource during the
processing of access request. In this case, a TCH can be used as only one SDCCH,
which is a waste of the TCH resources. For the method of computing the capacity,
refer to the Guide to Capacity Planning.
Some counters related to the BSC6000 are listed in the following table.
Ca
use
s
BSC-Level Cell-Level
Tra
ffic
Lo
ad
Help of Performance Counter
Reference > BSC
Measurement > Access
Measurement per BSC
SDCCH Congestion Rate
(overflow) (%)
ZK3004: Traffic Volume on
SDCCH per BSC
TS3010: Traffic Volume of
Signaling Channels (SDCCH)
CS3010: MRs on Signaling
Channels (SDCCH)
CS3023: Traffic Volume of Speech
Service on SDCCH
CS3024: Traffic Volume of Short
Message Service on SDCCH

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CS3025: Traffic Volume of USSD
Service on SDCCH
All the services such as location updating, MS attach/detach, call setup, short
messages are performed on the Schiff a certain service causes burst traffic, the
SDCCH congestion may occur.
In this case, check whether the abnormity of Channel Requests, Successful
Immediate Assignments or Successful SDCCH Seizures is caused by the service of
location updating, MOC, paging, or short message. Note that you should check the
history traffic statistics when querying these traffic counters to see whether they
fluctuate during a certain period.
The traffic counters related to the SDCCH request and seizure are listed in the
following table. By analyzing these counters, you can find out the reason why
congestion occurs in the network or cell.
If the SDCCH congestion is caused by certain burst services such as location
updating and short messages, use the following methods according to the specific
configuration of the BTSs.
a. For the BTS with multiple TRXs, enable the SDCCH dynamic allocation
function or increase the number of SDCCH channels.
b. For the cell with only one TRX or without extra channels, enable the
immediate assignment procedure. In the immediate assignment procedure,
the TCH is immediately assigned when the SDCCH has no available
resource during the processing of access request.
c. Increase the number of TRXs.
It is difficult to avoid the SDCCH congestion caused by network burst services;
however, you can take some relief measures such as increasing the number of
SDCCHs or enabling the SDCCH dynamic conversion function.
Some counters related to burst services of the BSC6000 are listed in the following
table.
Cause
s
BSC Cell-Level

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Troub
leshoo
ting
Burst
Traffi
c
None
.
A3030A: Call Setup Indications (MOC Non SMS)
(SDCCH)
A3030B: Call Setup Indications (MOC SMS)
(SDCCH)
A3030C: Call Setup Indications (MTC) (SDCCH)
A3030D: Call Setup Indications (Emergency Call)
(SDCCH)
A3030E: Call Setup Indications (Call Re-
establishment) (SDCCH)
A3030F: Call Setup Indications (Location
Updating) (SDCCH)
A3030G: Call Setup Indications (IMSI Detach)
(SDCCH)
A3030H: Call Setup Indications (PS Service)
(SDCCH)
A3030I: Call Setup Indications (SS) (SDCCH)
A3030J: Call Setup Indications (LCS) (SDCCH)
A3030K: Call Setup Indications (Others) (SDCCH)
3.2.3 Checking Data Configuration
The SDCCH congestion relates to the parameter settings of the BSC. If the
parameters are set correctly, the SDCCH congestion can be relieved.
1. LAC planning: The LAC setting is very important to the network performance.
If the LAC is too great, the signaling flow increases during the paging in the BTSs
within the LA, and thus the network load increases. If the LAC is too small, the
number of MS location updating increases, and thus the signaling flow of the system
increases, which may lead to the SDCCH congestion. Therefore, proper planning of
LA can reduce the SDCCH congestion. SDCCH Congesiton Caused by Improper
Configuration of LAC
2. SDCCH dynamic allocation: Enabling the SDCCH dynamic allocation
function reduces the SDCCH congestion, but also decreases the utilization of the TCH
resources. To prevent this problem, set the relevant counters according to the actual
situations.
3. Set relevant timers such as T3101 and T3212 properly.
Setting the T3101 to a small value can effectively reduce the congestion caused
by double SDCCH allocation. If the T3101 is set to an over-great value, the signaling
resources are occupied for a long period, which leads to a waste of resources. To
optimize the utilization of the signaling resources, set T3101 to a small value,
especially when enabling the queuing function.
Setting T3212 to a great value can decrease the SDCCH load caused by
periodical location updating. If the T3212 is too great, the MS possibly sends no

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request for location updating. In this case, the MS is identified as implicit off-line, and
the system displays "The subscriber you dial is power off" even though the called MS
is on.
The setting of RACH Min.Access Level may cause SDCCH congestion. If this
parameter is set too small, the interference signal access increases and excessive
SDCCH requests are initiated, thus leading to the SDCCH congestion. If the
parameter is set too great, call failures may occur though there are signals. Therefore,
set the parameter according to the actual BTS sensitivity, the lowest MS access level
and the interference.
5. In the assignment procedure, if the late assignment is enabled, the calling MS
always occupies the SDCCH during the period of waiting for the called party to pick
up the phone. Therefore, the time of the SDCCH occupation increases and other MSs
may fail to request the SDCCH, thus leading to the SDCCH congestion.
6. The setting of RXLEV_ACCESS_MIN also causes the SDCCH congestion. If
the RXLEV_ACCESS_MIN is set too small, the number of MSs that access the
network increases. When the MS requests MOC or location updating, the SDCCH
congestion may occur.
7. The setting of MS MAX Retrans also causes the SDCCH congestion. To
increase the paging success rate, MS MAX Retrans is increased. The BSC may
assign multiple SDCCHs to a single MS. Thus, the SDCCH congestion rate increases.
8. Improper setting of power also causes the SDCCH congestion. If the power of
the main BCCH is set normal but the power of the TCH on the non-main BCCH TRX
is set too small, a power difference band forms. When an MS requests the SDCCH
successfully in the power difference band, the TCH cannot be occupied and the time
of the SDCCH occupation increases, thus leading to congestion. For details, see
section 5.1 "Congestion Caused by Improper Configuration of Power"
3.2.4 Checking the Um Interface
Interference on the Um interface also causes congestion. In the network with
small space between BTSs and tight BCCH frequency reuses, the system may receive
many random interference signals and assign each random access signal a SDCCH.
Thus, the congestion occurs. If the immediate assignment success rate and the paging
success rate decrease, the RACH during the performance measurement may be
overloaded. The traffic measurement counters related to the interference include the
number of idle TCHs in interference bands 4 and 5, the rate of bad quality handovers
and the TCH seizure failures in the measurement of the call drop performance. The
interference of GSM is classified into inter-network interference and intra-network
interference. The methods of eliminating the interference are as follows:
a. Inter-network Interference
For inter-network interference, query the number of idle TCHs in interference
bands 4 and 5 to determine whether the uplink interference exists. To eliminate the

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interference, use a spectrum analyzer and check the network parameters to locate the
interference source. Then, adjust or close the interference source.
b. Intra-network Interference
If the frequency planning and antenna tilt planning are improper, the network
cannot achieve high Carrier-to-Interference Ratios (CIRs), which causes intra-
frequency or inter-frequency interferences or the SDCCH congestion.
The UL frequency and DL frequency are paired, so we can query the interference
band to find out the cells with high mean number of SDCCHs in interference band
four and five. Then check the frequency planning of the network. Find out the faulty
cell, and modify the frequency planning to eliminate the interference. For intra-
network interference, perform drive tests. Check the actual distribution of signals to
determine whether the interference exists. Then, modify the antenna planning or
frequency planning.
For detailed methods of checking interference, refer to the G-Guide to Eliminate
Interference.
The following tables lists some KPIs related to the BSC6000 interference.
Cause BSC-Level TRX-Level
Interfe
rence
None. Interference band measurement per TRX
AS4200A:Mean Number of SDCCHs in Interference
Band 1
AS4200B: Mean Number of SDCCHs in
Interference Band 2
AS4200C: Mean Number of SDCCHs in
Interference Band 3
AS4200D: Mean Number of SDCCHs in
Interference Band 4
AS4200E: Mean Number of SDCCHs in
Interference Band 5
S4350D: Radio Link Failures (SDCCH)
4 Test Method
The SDCCH congestion rate is one of the KPIs, which can be obtained through
the registration or reporting of the related KPIs. Generally, SDCCH congestion rate is
not measured through drive tests because of the limited samples, incomplete test
routes, and the irregular occurrence of the congestion in areas with low traffic.
At present, the vendors and mobile operators use different formulas to calculate
the SDCCH congestion rate, thus leading to different values of this counter. In actual
measurement, you should register the specific counters and use an appropriate
formula to calculate the value of the counter.

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5 Case Analysis of SDCCH Congestion Rate
5.1 Congestion Caused by Improper Configuration of Power
Description
The engineers observe the status of each board of the BTS3001C-204
(configured with two omni-directional antennas) on the LMT and find that they are in
normal state. The traffic measurement results, however, show that the congestion rate
in this BTS is high (13%). Then the engineers observe the status of the TCH and find
that the TCH of TRX1 is idle whereas the TCH and SDCCH of TRX0 are busy.
Alarm Information
None.
[Cause Analysis]
The possible reason is that the output power of TRX1 is small and is not detected
by the BTS3001C.Most MSs are not assigned a TCH of TRX1 successfully except
those close to the BTS. This causes the SDCCH to be occupied for a long time, thus
leading to the SDCCH congestion.
Handling Procedure
a. Block the TCHs of TRX1, and the SDCCH counters are normal.
b. Use a power meter to measure the output power of TRX1 and TRX0. The result
shows that the output power of TRX1 is very small but that of TRX0 is normal.
c. Replace the BTS and all counters are normal.
5.2 SDCCH Congesiton Caused by Improper Configuration of LAC
Description
The SDCCH Congestion Rate of two cells in a BTS (S1/1/1) is up to 4.91%;
however, the traffic of each cell is generally less than 3 Erl.
Handling Procedure
1. Query the counters of TCHs and SDCCHs and find that the traffic on TCH is
not high with each cell less than 3 Erl. The number of SDCCH seizure requests is
large, even reaching 3,032 times during busy hours. The traffic volume is up to 1.86
Erl, and the congestion rate is up to 4.91%.
The SDCCH is occupied in the following situations.
a. Transmitting the signaling before call setup
b. Transmitting the signaling of handover
c. Transmitting the signaling of location update in idle mode
3. Normally, the traffic volume on the TCH is 2.79 Erl (the number of available
TCHs is 6).The number of TCH seizure requests (including handovers) is 318, which
is within the normal range. The number of TCH handover requests is 146, which is
also within the normal range. Therefore, the congestion may be caused by frequent
location updates.

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4. Check the LAC of this BTS and find that it is 0500. The LACs of the cells
near this BTS are 0520. Change the LAC of this BTS into 0520. During busy hours,
the number of SDCCH seizure requests becomes 298, the congestion rate becomes 0,
and the traffic volume becomes 0.27 Erl.
Suggestion and Summary
1. Plan the LAC according to the geographical locations and habits of the MSs to
minimize the location updates at the edge of a Lifer example, the traffic volume is
high in urban areas. If there are more than two LAs, the mountains, rivers, or other
natural resources should be set as the boundary of the LA to minimize coverage
overlapping of different cells in two neighboring Lassie there is no mountain or river,
the streets or the place with heavy traffic (for example malls) should not be set as the
boundary of the LA. Generally, the boundary of the LA should not be parallel or
vertical to the streets but beveled to the streets. Generally, in rural-urban fringe zone,
the boundary of an LA should be set in the area with least traffic instead of in the area
with high traffic to avoid frequent location updates. The value of LAC should not be
set too great or too small. It is recommended that the number of TRXs be not more
than 300.
2. When changing the LAC, note that the cells cannot have the same CGI. If the
LAC is changed on the BSS side, the LAC should be changed on the MSC side
accordingly.
　
6 Feedbacks on High SDCCH Congestion Rate
The SDCCH congestion rate can be obtained through the analysis of the traffic
statistics. Therefore, if the SDCCH congestion rate on site is too high, send a
feedback about the relevant traffic statistics to the headquarters.
The information that needs to be sent is shown as follows:
1. The configuration files (.DAT files) of the faulty cell or BSC, and the version
number of the BSC software and BTS software;
2. The alarm logs of the faulty cell;
3. The RSL tracing data of the faulty cell;
4. The interference measurement report of the faulty cell (TRX-level);
5. The list of the cells with high SDCCH congestion rate, and the traffic statistics
(cell-level) of the faulty cell (including the congestion rate, signaling
availability and traffic volume)

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Appendix Relevant Traffic Counters to BSC6000 SDCCH Congestion Rate
BSC-Level Cell-Level TRX-Level
SDCCH Seizure Requests
per BSC
R3300A: Channel Activation
Attempts in Immediate
Assignment Procedure
(SDCCH)
R4400A: Attempted
Immediate Assignments
(SDCCH)
Failed SDCCH Seizures due
to Busy SDCCH per BSC
R3300B: CHAN ACTIV
NACK Messages Sent by
BTS in Immediate
(SDCCH)
R4400B: Successful
Immediate Assignments
(SDCCH)
Successful SDCCH Seizures
per BSC
R3300C: Channel Activation
Timeouts in Immediate
(SDCCH)
R4430A: Attempted
Handovers (SDCCH)
Call Drops on SDCCH per
BSC
Attempts in Internal Intra-
Cell Handover Procedure
(SDCCH)
R4430B: Completed
Handovers (SDCCH)
Traffic Volume on SDCCH
per BSC
R3330B: CHAN ACTIV
BTS in Internal Intra-Cell
Handover Procedure
(SDCCH)
S4310D: Uplink Quality
during Radio Link Failure
(SDCCH)
Available SDCCHs per BSC R3330C: Channel Activation
Timeouts in Internal Intra-
Cell Handover Procedure
(SDCCH)
S4330D: Downlink Quality
(SDCCH)
Configured SDCCHs per
BSC
Attempts in Incoming
Internal Inter-Cell Handover
Procedure (SDCCH)
S4300D: Uplink Level
(SDCCH)
Congestion Ratio on
SDCCH per BSC
R3340B: CHAN ACTIV
BTS in Incoming Internal
Inter-Cell Handover
Procedure (SDCCH)
S4320D: Downlink Level
(SDCCH)
Call Drop Ratio on SDCCH
per BSC
R3340C: Channel Activation
Timeouts in Incoming
Internal Inter-Cell Handover
Procedure (SDCCH)
S4350D: Radio Link
Failures (SDCCH)

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SDCCH Availability per
BSC
Attempts in Incoming
External Inter-Cell
Handover Procedure
(SDCCH)
S4340D: TA during Radio
Link Failure (SDCCH)
　 R3340B: CHAN ACTIV
BTS in Incoming External
Inter-Cell Handover
Procedure (SDCCH)
AS4310D: Mean Uplink
Quality during Radio Link
Failure (SDCCH)
　 R3340C: Channel Activation
Timeouts in Incoming
External Inter-Cell
Handover Procedure
(SDCCH)
AS4330D: Mean Downlink
Quality during Radio Link
Failure (SDCCH)
　 A3030A: Call Setup
Indications (MOC Non
SMS) (SDCCH)
AS4300D: Mean Uplink
Level during Radio Link
Failure (SDCCH)
　 A3030B: Call Setup
Indications (MOC SMS)
(SDCCH)
AS4320D: Mean Downlink
Level during Radio Link
Failure (SDCCH)
　 A3030C: Call Setup
Indications (MTC)
(SDCCH)
AS4200A:Mean Number of
SDCCHs in Interference
Band 1
　 A3030D: Call Setup
Indications (Emergency
Call) (SDCCH)
AS4200B: Mean Number
of SDCCHs in Interference
Band 2
　 A3030E: Call Setup
Indications (Call Re-
establishment) (SDCCH)
AS4200C: Mean Number
Band 3
　 A3030F: Call Setup
Indications (Location
Updating) (SDCCH)
AS4200D: Mean Number
Band 4
　 A3030G: Call Setup
Indications (IMSI Detach)
(SDCCH)
AS4200E: Mean Number
Band 5
　 A3030H: Call Setup
Indications (PS Service)
(SDCCH)
　
　 A3030I: Call Setup
Indications (SS) (SDCCH)
　

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　 A3030J: Call Setup
Indications (LCS) (SDCCH)
　
　 A3030K: Call Setup
Indications (Others)
(SDCCH)
　
　 H3500: Outgoing Inter-RAT
Inter-Cell Handover
Requests (SDCCH)
(Excluding Directed Retry)
　
　 H3510: Outgoing Inter-RAT
Inter-Cell Handover
Commands (SDCCH)
　
　 H3240: Number of
Incoming Internal Inter-Cell
Handover Detection
Messages Received by BSC
(SDCCH)
　
　 H3040: Number of Internal
Intra-Cell Handover
Detection Messages
Received by BSC (SDCCH)
　
　 H3440: Incoming External
Inter-Cell Handover
Detection Messages
Received by BSC (SDCCH)
　
　 H3600: Incoming Inter-RAT
Inter-Cell Handover
Requests (SDCCH)
　
　 H3520: Failed Outgoing
Inter-RAT Inter-Cell
Handovers (SDCCH)
　
　 S3010A: MRs on Signaling
Channels (SDCCH)
(M900/850 Cell)
　
　 S3010B: MRs on Signaling
Channels (SDCCH)
(M1800/1900 Cell)
　

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