01 03 traffic statistic items

M900/M1800 Base Station Controller
Traffic Statistic Manual - Volume I Contents
Issue 02 (2008-10-07)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
i
Contents
3 Traffic Statistic Items ................................................................................................................3-1
3.1 BSC Measurement Function .........................................................................................................................3-3
3.1.1 General.................................................................................................................................................3-3
3.1.2 Access Measurement Function(1)........................................................................................................3-4
3.1.3 Access Measurement Function(2)......................................................................................................3-39
3.1.4 Handover Measurement Function(1) .................................................................................................3-41
3.1.5 Handover Measurement Function(2) .................................................................................................3-75
3.2 SCCP Measurement Function .....................................................................................................................3-94
3.2.1 General...............................................................................................................................................3-94
3.2.2 Statistic Items.....................................................................................................................................3-95
3.3 A-Interface Operation and Management Statistic......................................................................................3-101
3.3.1 General.............................................................................................................................................3-101
3.3.2 Statistic Items...................................................................................................................................3-102
3.4 A-interface Equipment Maintenance Statistic ...........................................................................................3-105
3.4.1 General.............................................................................................................................................3-105
3.4.2 Statistic Items...................................................................................................................................3-105
3.5 A-interface Trunk Board Message Statistic...............................................................................................3-107
3.5.1 General.............................................................................................................................................3-107
3.5.2 Statistic Items...................................................................................................................................3-108
3.6 CPU Measurement Function .....................................................................................................................3-109
3.6.1 General.............................................................................................................................................3-109
3.6.2 Statistic Items...................................................................................................................................3-110
3.7 BSC Cell Broadcast Measurement............................................................................................................3-111
3.7.1 General.............................................................................................................................................3-111
3.7.2 BSC Cell Broadcast Measurement Function (Total)........................................................................3-111
3.7.3 BSC Cell Broadcast Measurement Function (Period)......................................................................3-124
3.7.4 BSC Cell Broadcast Measurement Function (Others) .....................................................................3-125
3.8 MTP Measurement Function.....................................................................................................................3-126
3.8.1 General.............................................................................................................................................3-126
3.8.2 Statistic Items...................................................................................................................................3-127

Traffic Statistic Manual - Volume I Figures
Issue 02 (2008-10-07)
iii
Figures
Figure 3-1 CM SERVICE REQUEST rejection process....................................................................................3-7
Figure 3-2 Circuit paging process ......................................................................................................................3-9
Figure 3-3 CCCH overload process..................................................................................................................3-11
Figure 3-4 Packet paging process.....................................................................................................................3-12
Figure 3-5 immediate assignment transmission process...................................................................................3-12
Figure 3-6 Packet immediate channel assignment procedure...........................................................................3-13
Figure 3-7 CC connection establishment process.............................................................................................3-14
Figure 3-8 Immediate assignment procedure-channel seizure procedure.........................................................3-17
Figure 3-9 Assignment procedure-channel seizure procedure..........................................................................3-17
Figure 3-10 Intra-BSC handover channel seizure procedure............................................................................3-18
Figure 3-11 Incoming BSC handover channel seizure procedure ....................................................................3-18
Figure 3-12 TCH drop for assignment .............................................................................................................3-21
Figure 3-13 Drop for Intra BSC handover........................................................................................................3-21
Figure 3-14 Incoming BSC TCH handover procedure.....................................................................................3-22
Figure 3-15 Successful TCH seizures for very early assignment procedure ....................................................3-22
Figure 3-16 TCH drop for very early assignment.............................................................................................3-24
Figure 3-17 Immediate assignment procedure-channel seizure procedure.......................................................3-25
Figure 3-20 Assignment implementation process.............................................................................................3-28
Figure 3-21 Signaling channel request procedure ............................................................................................3-34
Figure 3-22 Intracell TCHF-TCHH handover success times ...........................................................................3-44
Figure 3-23 internal intercell handover ............................................................................................................3-45
Figure 3-24 Successful internal intercell handover (DIRECTED RETRY) .....................................................3-47
Figure 3-25 Successful Internal intercell handover (not DIRECTED RETRY)...............................................3-48
Figure 3-26 Intra BSC handover ......................................................................................................................3-50

Figures
Traffic Statistic Manual - Volume I
iv
Issue 02 (2008-10-07)
Figure 3-27 Successful incoming BSC handover.............................................................................................3-51
Figure 3-28 Unsuccessful incoming BSC handover.........................................................................................3-57
Figure 3-29 Incoming BSC handover...............................................................................................................3-61
Figure 3-30 Attempted outgoing BSC handover ..............................................................................................3-62
Figure 3-31 Successful outgoing BSC handover..............................................................................................3-65
Figure 3-32 Unsuccessful outgoing BSC handovers........................................................................................3-68
Figure 3-34 Unsuccessful BSC internal handovers..........................................................................................3-70
Figure 3-36 Outgoing system HO attempts......................................................................................................3-92
Figure 3-37 Unsuccessful outgoing system HOs..............................................................................................3-93
Figure 3-38 Establishment of SCCP signaling connection (successful)...........................................................3-97
Figure 3-39 Establishment of SCCP signaling connection (failure).................................................................3-98
Figure 3-40 Establishment of SCCP signaling connection and data transmission ...........................................3-99
Figure 3-41 Transmission of SCCP signaling.................................................................................................3-100
Figure 3-42 Send broadcast short message.....................................................................................................3-113
Figure 3-43 Delete short message ..................................................................................................................3-113
Figure 3-44 Query broadcast channel.............................................................................................................3-114
Figure 3-45 Query the transmission of broadcast short message ...................................................................3-115
Figure 3-46 Set DRX mode............................................................................................................................3-115
Figure 3-47 Reset cells...................................................................................................................................3-116
Figure 3-48 BTS reports CBCH overflow......................................................................................................3-120
Figure 3-49 Received "write" messages.........................................................................................................3-120

Traffic Statistic Manual - Volume I Tables
Issue 02 (2008-10-07)
v
Tables
Table 3-1 Statistic items in Access measurement function items (1)..................................................................3-4
Table 3-2 Statistic items in Access measurement function items(2).................................................................3-39
Table 3-3 Statistic items in Handover measurement function(1) items ............................................................3-41
Table 3-4 Statistic items in Handover measurement function(2) items ............................................................3-76
Table 3-5 Statistic items in SCCP Measurement Function ...............................................................................3-94
Table 3-6 Statistic items in A-interface Operation and Management Statistic................................................3-101
Table 3-7 Statistic items in A-interface Equipment Maintenance Statistic.....................................................3-105
Table 3-8 Statistic items in A-interface Operation and Management Statistic................................................3-107
Table 3-9 Statistic items in CPU Measurement Function ...............................................................................3-110
Table 3-10 Statistic items in BSC Cell Broadcast Measurement Function (Total) .........................................3-111
Table 3-11 Statistic items in BSC Cell Broadcast Measurement Function(Period)........................................3-124
Table 3-12 Statistic items in BSC Cell Broadcast Measurement Function (Others).......................................3-125
Table 3-13 Statistic items in MTP Measurement Function.............................................................................3-126

Traffic Statistic Manual - Volume I 3 Traffic Statistic Items
Issue 02 (2008-10-07)
3-1
3 Traffic Statistic Items
About This Chapter
The following table lists the contents of this chapter.
Section Describes
3.1 BSC Measurement Function Describes the statistic items of BSC Measurement
Function.
3.2 SCCP Measurement Function Describes the statistic items of SCCP Measurement
Function.
3.3 A-Interface Operation and
Management Statistic
Describes the statistic items of A-Interface Operation
and Management Statistic.
3.4 A-interface Equipment
Maintenance Statistic
Describes the statistic items of A-Interface
Equipment Maintenance Statistic.
3.5 A-interface Trunk Board
Message Statistic
Describes the statistic items of A-Interface Trunk
Board Message Statistic.
3.6 CPU Measurement Function Describes the statistic items of CPU Measurement
Function.
3.7 BSC Cell Broadcast
Measurement
Describes the statistic items of BSC Cell Broadcast
Measurement Function.
3.8 MTP Measurement Function Describes the statistic items of MTP Measurement
Function.
3.9 Cell Measurement Function Describes the statistic items of Cell Measurement
Function
3.10 Power Control Measurement Describes the statistic items of Power Control
3.11 Call Drop Measurement Describes the statistic items of Call Drop

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Section Describes
3.12 SITE Initial Measurement
Function
Describes the statistic items of Site Initial
3.13 BTS Initial Measurement
Function
Describes the statistic items of Cell Initial
3.14 Cell Broadcast Statistic Describes the statistic items of Cell Broadcast
Statistic.
3.15 Outgoing Inter Cell Handover
Measurement Function
Describes the statistic items of Outgoing Inter Cell
Handover Measurement Function.
3.16 Incoming Inter Cell Handover
Describes the statistic items of Incoming Inter Cell
Handover Measurement Function.
3.17 Undefined Adjacent Cell
Describes the statistic items of Undefined Adjacent
Cell Measurement Function.
3.18 Defined Adjacent Cell
Describes the statistic items of Defined Adjacent Cell
3.19 Receiving Quality
Measurement
Describes the statistic items of Receiving Quality
3.20 Receiving Level Measurement
Function
Describes the statistic items of Receiving Level

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3.1 BSC Measurement Function
3.1.1 General
The statistic items in BSC Measurement Function are used to measure the traffic volume of
all the cells in the BSC.
The BSC Measurement Function includes: Access measurement function, Handover
measurement function(1), and Handover measurement function(2).
The statistic items in BSC Measurement Function can be divided into following
classifications:
Statistics of times that MSC rejects MS’s service request, including the statistics
according to different rejection causes.
The status of circuit service and packet service paging being transmitted and
implemented, including the measurement at A (Pb) interface and Abis interface.
Measurement of circuit service and packet service CCCH overload.
The status of circuit service and packet service immediate assignment request and the
implementation.
Number of TCH seizure requests, the successful TCH seizures, TCH call drops, TCH
seizure requests for very early assignment, successful TCH seizures for very early
assignment, TCH call drops for very early assignment, SDCCH seizure requests,
successful SDCCH seizures, and SDCCH call drops.
Dedicated measurement for assignment procedure, including the number of unsuccessful
assignments due to various causes.
Measurement of TCH MR (measurement report), and independent measurement of very
early TCH assignment MR.
Intra-BSC handover request and the implementation of the request, the measurement of
incoming BSC handover request and the implementation (including the measurement of
the unsuccessful Incoming BSC Handovers due to various causes), outgoing BSC
handover request and the implementation, and the measurement of the handover due to
various causes.
State statistics of A-interface trunk circuits, including the number of circuits in Not
Installed or Faulty state, Idle state, and Busy state, and the percentage of the number to
the total number configured.
The measurement of analytical items such as BSC handover success rate, call drop rate,
and traffic volume.
Many statistic items in BSC Measurement Function have the corresponding items of cell
level in Cell Measurement Function.
For the traffic status of the specified cell, you can register the related items in Cell
It is recommended that all statistic items in BSC Measurement Function should be
registered through 3 tasks after the BSC kickoff because these items are important items
for measuring network performance. It is recommended that the templates should be
used to register and the traffic statistic cycle should be 60 minutes.
900/850 cell refers to the cell whose main BCCH frequency is 900MHz or 850MHz.
1800/1900 cell refers to the cell whose main BCCH frequency is 1800MHz or
1900MHz.

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The statistic object of BSC Measurement Function is the whole BSC. So there is no
object option on the object definition interface in OMC traffic statistics console.
3.1.2 Access Measurement Function(1)
All the statistic items of Access Measurement Function(1) are listed in.Table 3-1
Table 3-1 Statistic items in Access measurement function items (1)
No. Item name
1 Sum of CM Service Rejections
2 CM Service Rejections due to Congestion
3 CM Service Rejections due to Network Failure
4 CM Service Rejections due to Illegal MS
5 CM service rejections due to error messages
6 CM Service Rejections due to Other Causes
7 Average Interval of Random Accesses
8 Average Interval of Random Accesses for Packet Call
9 Number of PAGING REQUESTs for CS Service on the A Interface
10 Number of PAGING REQUESTs for CS Service on the Pb Interface
11 Number of PAGING REQUESTs for PS Service on the Pb Interface
12 Packet Paging Commands to BTS
13 Successful Circuit Pagings of Abis Interface
14 Circuit Paging PCH Overloads of Abis Interface
15 Circuit Paging RACH Overloads of Abis Interface
16 Packet Paging Commands to BTS
17 Immediate Assignment Requests
18 Radom Access Requests
19 Packet Immediate Assignment Request
20 Immediate Assignment Transmissions
21 Successful Packet Immediate Assignment
22 Successful Connections
23 Attempted TCH Seizures (All)
24 Attempted TCH Seizures (All)
25 Successful TCH Seizures
26 TCH Call Drop

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No. Item name
27 Successful TCH Seizures for Early Assignment
28 TCH Drop for Very Early Assignment
29 Attempted SDCCH Seizures (all)
30 Successful SDCCH Seizures
31 Attempted SDCCH Seizures Meeting SDCCH Overflow
32 SDCCH Call Drop
33 Assignment Requests
34 Unsuccessful Assignments
35 Unsuccessful Assignments (Equipment Failure)
36 Unsuccessful Assignments (Requested Terrestrial Resource Unavailable)
37 Unsuccessful Assignments (Terrestrial Circuit Already Allocated)
38 Unsuccessful Assignments (Invalid Message Contents)
39
Unsuccessful Assignments (Radio Interface Failure, Reversion To Previous
Channel)
40 Unsuccessful Assignments (No Radio Resource Available)
41 Unsuccessful Assignments (Other Causes)
42 Unsuccessful Channel Activation During Assignment (NACK)
43 Channel Activation Timeout During Assignment
44 Sum of TCH Measurements (Excluding Very Early Assignment)
45
Sum of 1800/1900 Cell TCH Measurements(Excluding Very Early
Assignment)
46 Sum of Full Rate TCH Measurements (Excluding Very Early Assignment)
47 Sum of Half Rate TCH Measurements (Excluding Very Early Assignment)
48
Sum of 1800/1900 Cell Full Rate TCH Measurements (Excluding Very Early
Assignment)
49
Sum of 1800/1900 Cell Half Rate TCH Measurements (Excluding Very Early
Assignment)
50 Sum of Configured TRX in the BSC
51 Sum of Available TRX in the BSC
52 Assignment Requests With Signaling Channel
53 Successful Assignments With Signaling Channel
54 Average number of A-interface circuits(uninstall)
55 Average number of A-interface circuits(Fault)

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No. Item name
56 Average number of A-interface circuits(Maintenance)
57 Average number of A-interface circuits(Blocked)
58 Average number of A-interface circuits(Idle)
59 Average number of A-interface circuits(Busy)
60 Average number of A-interface circuits(Opposite Uninstall)
61 Number of Configured A-Interface Circuits
62 Percent of A-Interface Circuit (Uninstall) (%)
63 Percent of A-Interface Circuit (Fault) (%)
64 Percent of A-Interface Circuits (Maintenance) (%)
65 Percent of A-Interface Circuits (Blocked) (%)
66 Percent of A-Interface Circuits (Idle) (%)
67 Percent of A-Interface Circuits (Busy) (%)
68 Percent of A-Interface Circuits (Opposite Uninstall) (%)
69 TCH Channel Allocation Failure (No Available License)
70 Circuit Paging Success Rate
71 Ratio of Paging Channel Overloads (%)
72 Rate of Sending Immediate Assignment Command
73 TCH Call Drop Rate (%)
74 Traffic Volume (Excluding Very Early Assignment) (Erl)
75 Traffic Volume Of 1800/1900 Cell (Excluding Very Early Assignment) (Erl)
76 Percentage of TRX In Good Condition (%)
77 SDCCH Call Drop Rate (%)
78 SDCCH Congestion Rate (SDCCH Overflow) (%)
79 Full Rate Traffic Volume (Excluding Very Early Assignment) (ERL)
80 Half Rate Traffic Volume (Excluding Very Early Assignment) (ERL)
81
Full rate Traffic Volume Of 1800/1900 Cell (Excluding Very Early
Assignment) (ERL)
82
Half Rate Traffic Volume Of 1800/1900 Cell (Excluding Very Early
Assignment) (ERL)

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Sum of CM Service Rejections
Description: in the MS originating immediate assignment procedure, first MS and BSS
establish RR connection. Then MS sends the detailed MM service request on MM layer
through CM SERVICE REQUEST to network side. This message can carry the
following MM service types: Mobile originating call establishment, packet mode
connection establishment, emergency call establishment, short message service and
supplementary service activation. BSS transparently transmits this message to NSS. If
NSS does not support nor does not respond to this service request for some reason, MSC
sends CM SERVICE REJECT message to the MS. BSC transparently transmits this
message. See GSM 0408 protocol.
Measurement point: as shown in Figure 3-1 A1, when BSC receives the DTAP message
of CM SERVICE REJECT from MSC, this item is measured regardless the rejection
cause carried in the message.
Formula: none
Figure 3-1 CM SERVICE REQUEST rejection process
A1: Sum of CM service rejections
B1: Sum of CM service rejections (congestion)
C1: Sum of CM service rejections (network failure)
D1: Sum of CM service rejections (illegal MS)
E1: Sum of CM service rejections (other reasons)
F1: Sum of CM service rejections (error messages)
CM Service Rejections due to Congestion
Description: if NSS cannot normally respond to a CM SERVICE REQUEST message
due to the congestion after receiving this message from MS MM layer, NSS responds
MS a CM SERVICE REJECT message in which the rejection cause is congestion. See
GSM 0408 protocol.
Measurement point: as shown in the B1 in Figure 3-1, this item is measured when BSC
receives the DTAP message of CM SERVICE REJECT from MSC and the rejection
cause carried in this message is congestion.
Formula: none

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CM Service Rejections due to Network Failure
Description: if NSS cannot normally respond to a CM SERVICE REQUEST due to
network failure after receiving this message from MS MM layer, NSS responds MS a
CM SERVICE REJECT message in which the rejection cause is network failure. See
GSM 0408 protocol.
Measurement point: as shown in the C1 in Figure 3-1, BSC measures this item when
BSC receives the DTAP message of CM SERVICE REJECT from MSC, the rejection
cause carried in this message is network failure.
Formula: none
CM Service Rejections due to Illegal MS
Description: if NSS cannot normally respond to a CM SERVICE REQUEST due to
being unable to identify the MS after receiving this message from the MS MM layer, the
NSS responds MS a CM SERVICE REJECT message in which the rejection cause is
illegal MS. See GSM 0408 protocol.
Measurement point: as shown in the D1 in Figure 3-1, this item is measured when the
BSC receives the DTAP message of CM SERVICE REJECT from MSC with the
rejection cause carried in this message being illegal MS.
Formula: none
CM service rejections due to error messages
Description: if NSS cannot normally respond to a CM SERVICE REQUEST due to error
messages after receiving this message from the MS MM layer, the NSS responds MS a
CM SERVICE REJECT message in which the rejection cause is error message. See
GSM 0408 protocol.
Measurement point: as shown in the F1 in the Figure 3-1, this item is measured when the
BSC receives the DTAP message of CM SERVICE REJECT from MSC with the
rejection cause carried in this message being error messages.
Formula: none
CM Service Rejections due to Other Causes
Description: if NSS cannot normally respond to a CM SERVICE REQUEST due to the
reasons other than above mentioned ones after receiving this message from MS MM
layer, NSS responds MS a CM SERVICE REJECT message. See GSM 0408 protocol.
Measurement point: as shown in the E1 in Figure 3-1, this item is measured when BSC
receives the DTAP message of CM SERVICE REJECT from MSC with the rejection
cause carried in this message being other than the above mentioned ones.
Formula: none
Average Interval of Random Accesses
Description: This item describes the access frequency of calling MS. The RR entity of
the mobile station initiates the immediate assignment procedure by scheduling the
sending of CHANNEL REQUEST on the RACH to BTS, then BTS sends CHANNEL
REQUIRED to BSC. See GSM 0408.
Measurement point: BSC counts 1 to the number of channel accesses every time it
receives CHANNEL REQUIRED message from BTS, and average inter arrival time =
measurement period (second)/sum of channel access times within the measurement
period.

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Formula: Measurement period (second)/sum of channel access times within the
measurement period
Unit: Second
Average Interval of Random Accesses for Packet Call
Description: This item describes the frequency of PS access frequency with the access
cause being packet call. The RR entity of the mobile station initiates the immediate
channel assignment procedure by periodically sending of CHANNEL REQUEST on the
RACH to BTS, then BTS sends CHANNEL REQUIRED to BSC. See GSM 0408
protocol.
Measurement point: BSC counts 1 to the number of channel accesses every time BSC
receives CHANNEL REQUIRED message from BTS containing access cause "packet
call", and average inter of packet arrival time = measurement period (second)/sum of
channel packet access times in the measurement period.
Formula: measurement period (second)/sum of channel packet access times within the
measurement period
Unit: Second
Number of PAGING REQUESTs for CS Service on the A Interface
Description: when an MS under the BSC is called for CS service, the MSC sends the
circuit service PAGING message to page the called MS from the A interface. This item is
used to measure the sum of the received PAGING messages in the statistic cycle. The
repeated PAGING message is measured repeatedly. See GSM Rec. 08.08.
Measurement point: As shown in Figure 3-2 A1, this item is measured every time BSC
receives the circuit PAGING messages from the A interface.
Formula: none
Figure 3-2 Circuit paging process
3. PAGING REQUEST 2. PAGING COMMAND
MS BTS BSC PCU SGSN MSC/VLR
11'. PAGING
12'. PAGING
REQUEST
13'. PAGING
REQUEST
A2
4.CHANNEL REQUEST
5.CHANNEL REQUIRED
6.CHANNEL ACTIVATION
7. CHANNEL ACKTIVATION
ACKNOWLEDGE
8.IMMEDIATE ASSIGN
CMMAND9. IMMEDIATE
ASSIGNMENT
10. PAGING
RESPONSE
11. EST IND(PAGING
RESPONSE)
C1
A1
B1
1. PAGING
A1: Number of Paging Requests from the MSC for CS service on the A interface
A2: Received circuit paging messages from MSC through GS interface

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A1: Number of Paging Requests from the MSC for CS service on the A interface
B1: Circuit paging commands to BTS
C1: Successful circuit paging of Abis interface
Number of PAGING REQUESTs for CS Service on the Pb Interface
Description: When an MS under the BSC is called for CS service, the MSC sends the
circuit service PAGING message to page the called MS from the Gb interface. This item
is used to measure the sum of the received PAGING messages in the statistic cycle. The
repeated PAGING message is measured repeatedly. See GSM Rec. 08.08.
Measurement point: As shown in Figure 3-2 A2, this item is measured every time the
BSC receives the circuit PAGING messages from the Pb interface (between Huawei
BSC and the PCU).
Formula: None
Number of PAGING REQUESTs for PS Service on the Pb Interface
Description: When an MS under the BSC is called for PS service, the MSC sends a PS
PAGING message to page the called MS from the Gb interface. This item is used to
measure the sum of the received PAGING messages in a statistic cycle. The repeated
PAGING message is measured repeatedly. See GSM Rec. 08.08.
Measurement point: This item is measured every time the BSC receives a PS PAGING
message from the Pb interface (between Huawei BSC and the PCU).
Formula: None
Circuit Paging Commands to BTS
Description: in the case an MS under the BSC is called for CS service, BSC sends
PAGING COMMAND to the corresponding cell according to the cell identification
discriminator after receiving the circuit PAGING message from the MSC or PCU. This
item is used to measure the paging delivery times at Abis. See GSM 08.58 and 04.08.
Measurement point: as shown in the Figure 3-2 B1, this item is measured in every cell
every time BSC sends PAGING COMMAND message to the corresponding cell.
Formula: none
Successful Circuit Pagings of Abis Interface
Description: after a called MS receives PAGING REQUEST message from network side,
the paging response process is implemented. This MS reports ESTABLISH
INDICATION, with the cause value PAGING RESPONSE, to MSC if it successfully
seizes signaling channel. See GSM 0408 protocol.
Measurement point: as shown in Figure 3-2 C1, this item is measured every time BSC
receives PAGING RESPONSE message from MS.
Formula: none
Circuit Paging PCH Overloads of Abis Interface
Description: BTS reports CCCH LOAD INDICATION message to BSC when detecting
the overload of PCH, then BSC measures this item and sends OVERLOAD message to
MSC simultaneously. See GSM 0858 protocol.

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Measurement point: as shown in Figure 3-2 A1, this item is measured when BSC
receives CCCH LOAD INDICATION message from BTS with the cause value carried in
the message being PCH overload.
Formula: none
Figure 3-3 CCCH overload process
BTS BSC MSC/VLR
CCCH LOAD INDICATION
A1
OVERLOADB1
A1:Circuit paging PCH overloads of Abis interface
B1: Circuit paging RACH overloads of Abis interface
Circuit Paging RACH Overloads of Abis Interface
Description: When detecting RACH overload, BTS reports CCCH LOAD INDICATION
to BSC, then BSC measures this item and implements the internal flow control.
Measurement point: as shown in Figure 3-2 B1, this item is measured when BSC
receives CCCH LOAD INDICATION message from BTS with the cause value carried in
the message being RACH overload.
Formula: none
Packet Paging Commands to BTS
Description: in the case an MS under the BSC is called for packet service, SGSN sends
PAGING REQUEST message to PCU to page this MS. PCU processes this message and
then sends PACKET PAGING message to BSC. According to the cell identification
discriminator carried in the PACKET PAGING message, BSC sends PACKET PAGING
REQUEST message to the corresponding cell. See GSM 0408, 0460, 0360 protocols.
Measurement point: as shown in Figure 3-2 A1, this item is measured in every cell
when BSC sends a PACKET PAGING REQUEST message to the corresponding cell.
Formula: none

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Figure 3-4 Packet paging process
PACKETPAGING REQUEST
MS BSC+BTS PCU SGSN
PAGING REQUEST
PACKET PAGING
A1
A1: Packet paging commands to BTS
Immediate Assignment Requests
Description: when an MS wants to obtain network service due to some reason, this MS
sends CHANNEL REQUEST message to BTS on RACH to request Dedicated Control
Channel, then BTS sends CHANNEL REQUIRED to BSC. This item measures all the
access cause value of CHANNEL REQUIRED, not including the discarded numbers of
immediate assignment requests in flow control.
Measurement point: This item is measured when BSC receives CHANNEL REQUIRED
message from BTS, as shown in Figure 3-5A1. The item is measured after flow control.
That is to say, the item does not include the discarded numbrs of immediate assignment
requests in flow control
.Formula: none.
Figure 3-5 immediate assignment transmission process
MS BTS BSC
1.CHANNEL REQUEST
2.CHANNEL REQUIRED
ACKNOWLEDGE
5.IMMEDIATE ASSIGN CMMAND
A1
B1
A1: Immediate assignment request/ Radom Access Requests
B1: Immediate assignment transmissions
Radom Access Requests
Description: When an MS wants to obtain network service due to some reason, this MS
sends CHANNEL REQUEST message to BTS on RACH, then BTS sends CHANNEL
REQUIRED to BSC.
Measurement point:, This item is measured when BSC receives CHANNEL REQUIRED
message from BTS, as shown in Figure3-5A1.

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Formula: none
Packet Immediate Assignment Request
Description: to request channel for packet service, MS sends CHANNEL REQUEST
message to BTS on RACH and the access cause carried in the message is Packet Call,
then BTS sends CHANNEL REQUIRED to BSC. Upon reception of this message, BSC
forwards the request to PCU. See GSM 0408 and 0406 protocol.
Measurement point: as shown in Figure 3-6 A1, BSC measures this item when BSC
receives CHANNEL REQUIRED message from BTS and if the access cause carried in
the message is Packet Call.
Formula: none
Figure 3-6 Packet immediate channel assignment procedure
MS BTS BSC
CHANNEL REQUEST(PACKET CALL)
CHANNEL REQUIRED
IMMEDIATE ASSIGN CMMAND
A1
HUAWEI PCU
Packet Channel Request
Packet Immediate Assign Command
B1
A1: Packet immediate assignment request
B1: Successful packet immediate assignment
Immediate Assignment Transmissions
Description: in immediate assignment procedure, upon reception of the CHANNEL
REQUIRED message reported from BTS, BSC allocates and activates a signaling
channel for the MS. If BSC receives the CHANNEL ACTIVATION ACKNOWLEDGE
message from BTS indicating that the channel is ready, BSC sends an IMMEDIATE
ASSIGNMENT COMMAND message informing the MS to access the dedicated
signaling channel, which can be either SDCCH or TCH. This item includes all access
cause value of CHANNEL REQUIRED.
Measurement point: As shown in Figure 3-6 B1, this item is measured when BSC sends
the IMMEDIATE ASSIGN COMMAND message to MS.
Formula: none
Successful Packet Immediate Assignment
Description: if the cause value carried in the CHANNEL REQUEST message sent by
MS on RACH is packet call, BSC forwards this message to PCU after receiving the
message. PCU initiates PDCH assignment procedure after receiving the forwarded
message and sends a Packet Immediate Assign Command message (Huawei Pb interface)
to BSC, then BSC converts this message into IMMEDIATE ASSIGN COMMAND of
Abis interface to BTS and BTS sends this message to MS. This process is described in
Figure 3-6. The measurement point of this item is indicated in B1. See GSM 0408, 0460
protocol.
Measurement point: upon reception of the Packet Immediate Assign Command message
from PCU, BSC measures this item and sends IMMEDIATE ASSIGN COMMAND to
BTS.
Formula: none

3-14
Issue 02 (2008-10-07)
Successful Connections
Description: the successful circuit service connection time in immediate assignment
procedure, if CC connection is to be established after MM connection establishment of
MOC, MOC sends a SETUP message to the network to request the call setting up; then
MSC responds a CALL PROCESSING message to MOC and pages MTC
simultaneously. After the MM connection establishment between MSC and MTC, MSC
sends a SETUP message to MTC to request the establishment of CC connection. If
permitting the call establishment, MTC responds a CALL CONFIRM message to MSC
and MSC forwards this message to MOC. Having seized the traffic channel, MTC sends
an ALERTING message to MSC and MSC forwards this message to MOC. After that,
MTC sends a CONNECT message to MOC after its off-hook, MOC responds the
CONNECT ACKNOWLEDGE message. The call is set up and the MOC and MTC enter
the conversation state. See GSM 0408, 0858, 0808 protocols for detailed full process of
call connection establishment between the calling MS and the called MS.
This statistic item includes the "directed retry" in the channel assignment procedure. If the directed retry
takes place in the channel assignment procedure, this item is measured in the cell that actually allocates
channel that is destination cell of directed retry.
Measurement point: As shown in Figure 3-6 A’, A’’, this item is measured when BSC
receives the DTAP type of CC message CONNECT or CONNECT ACKNOWLEDGE.
If MOC and MTC share the same BSC, both MOC and MTC are measured.
Formula: none
Figure 3-7 CC connection establishment process
Ori-MS BSS1 MSC
A1"
1.CM SERVICE
REQUEST
BSS2 Termi-MS
3.CALL CONFIRM ED
2.SETUP
4.ALARTING
4.CONNECT
5.CONNECT ACKNOWLEDGEA1'
Note:
A1' count in BSS1
A1" count in BSS2
A’, A’’: Successful connections
Attempted TCH Seizures (All)
Description: in the following procedures, if the requested channel type is TCH, this item
shall be measured after BSC receives a relevant request.
− In immediate assignment procedure, MS sends CHANNEL REQUEST to BTS to
request radio channel.

Issue 02 (2008-10-07)
3-15
− In assignment procedure and incoming BSC handover procedure, MSC requests radio
resource by sending ASSIGNMENT REQUEST or HANDOVER REQUEST to
BSC.
− In intra BSC handover, BSC itself requests a new channel for call.

3-16
Issue 02 (2008-10-07)
SDCCH handover:
Handover happens on SDCCH.
Channel reallocation:
In the immediate assignment procedure, Huawei BSC supports channel reallocation. BSC initiates radio
channel allocation when it receives CHANNEL REQUIRED message from BTS. BSC allocates a TCH
if the access cause value of CHANNEL REQUIRED is "emergency call "or "call re-establishment" and
BSC supports very early assignment TCH. Otherwise, BSC allocates a SDCCH. BSC reallocates radio
channel automatically based on "GSM 0408" if BSC supports very early assignment of TCH and
channel allocation fails due to no radio resource available. In other words BSC allocates a TCH
automatically if SDCCH allocation fails and the access cause is not "location update", and similarly,
BSC allocates a SDCCH automatically if TCH allocation fails. So, to one CHANNEL REQUEST
message, BSC measures both SDCCH and TCH seizure times.
Very early assignment TCH:
If BSC allocates a TCH as a signaling channel in immediate assignment procedure, instead of the traffic
channel allocation procedure, the Mode Modify procedure can be implemented in the assignment
procedure.
Assignment SDCCH:
In the assignment procedure, MSC sends ASSIGNMENT REQUEST message to BSC to request for a
radio channel. BSC responses ASSIGNMENT COMPLETE message to MSC directly if the channel
type in the ASSIGNMENT REQUEST is SDCCH. In this case, BSC implements signaling or short
message transmission on the channel already allocated. BSC does not measure either "attempted
SDCCH seizures" or "successful SDCCH seizures" for it does not allocate a new channel. Instead, it
measures the times of "assignment requests" and "assignment success" after successfully sending
ASSIGNMENT COMPLETE message.
Discard CHANNLE REQUIRED in internal flow:
In the immediate assignment procedure, BSC receives CHANNEL REQUIRED messages from BTS.
BSC discards these messages if the system is too busy to respond. In this case, "attempted TCH" or
"SDCCH seizures" will be measured but "successful or unsuccessful channel seizures" will not be
measured.
Measurement point: the measurement point of this item is described inFigure 3-8, Figure
3-9, Figure 3-10 and Figure 3-11TCH-ATT-BSC1--TCH-ATT-BSC4.
− In immediate assignment procedure, this item is measured when BSC receives
CHANNEL REQUIRED message from BTS and the requested channel type is TCH.
− In assignment procedure, this item is measured when BSC receives ASSIGNMENT
REQUEST message from MSC and the requested channel type is TCH.
− In intra BSC handover, the source cell sends Intercell Handover Request message
(Huawei defined message) to the target cell; if the handover is taken place on TCH,
this item is measured when the target cell receives this message. The intra BSC
handover includes the case that handover is taken place in the same cell with the
originating and the target cell being the same one.
− This item is measured when Huawei BSC receives the HANDOVER REQUEST
message from other BSC and the handover is taken place on TCH.
Formula: none

Issue 02 (2008-10-07)
3-17
Figure 3-8 Immediate assignment procedure-channel seizure procedure
MS BTS BSC
CHANNEL REQUEST
CHANNEL REQUIRED
CHANNEL ACTIVATION
CHANNEL ACKTIVATION ACKNOWLEDGE
TCH-ATT-BSC1
TCH -ATT-BSC1: Attempted TCH seizures (all)
Figure 3-9 Assignment procedure-channel seizure procedure
MS BTS BSC
.ASSIGN CMMAND
MSC
ASSIGNMENT REQUEST
SABM
UA
ESTABLISH INDICATION
ASSIGNMENT COMPLETE
(directly retry)HANDOVER REQIRED
(directly retry)HANDOVER REQUEST ACK
CHANNEL ACTICATION
CHANNEL ACTIVATION ACK
QUEUEING INDICATION
TCH-ATT-BSC 2

3-18
Issue 02 (2008-10-07)
Figure 3-10 Intra-BSC handover channel seizure procedure
MS BTS' BSC Ori-Cell
HANDOVER ACCESS
UA
Intercell Handover Request
BSC Des-Cell BTS''
MR
Handover algorithm
HANDOVER COMMAND
Intercell Handover Response
HANDOVER DETECT
CH ACT
CH ACT ACK
HANDOVER COMPLETE
Inter Clear Request (Handover Success)
TCH-ATT-BSC3
SABM
Figure 3-11 Incoming BSC handover channel seizure procedure
MS Other BSC
HANDOVER ACCESS
UA
HANDOVER REQUIRED
HUAWEI BSC HUAWEI BTS
HANDOVER COMMAND
HANDOVER REQUEST ACK
HANDOVER DETECT
CH ACT
CH ACT ACK
HANDOVER COMPLETE
TCH-ATT-BSC4
MSC
QUEUEING INDICATION
HANDOVER REQUEST
SABM
TCH Call Drop Connected
Description: this item measures the number of call drop when MS is normally during the
conversation on radio channel. In the assignment procedure and handover procedure, the
establishment of a conversation is indicated by: in assignment procedure BSC receives
the CONNECT message and the CONNECT ACKNOWLEDGE message from CC layer;
in the incoming BSC handover procedure the target cell sends HANOVER COMPLETE
message to MSC; successful intra BSC handover: the target cell sends HANDOVER

Issue 02 (2008-10-07)
3-19
PERFORMED message to MSC when it detects the access of the MS. If the call drop
occurs after the above stages, it will be regarded as call drop connected.
Measurement point:
− Upon BSC’s reception of ERROR INDICATION message from BTS due to an
abnormal connection in a radio link layer. See GSM 0508 protocol.
− During MS conversation, BTS detects a fault in radio link layer or hardware; it sends
a CONNECTION FAILURE INDICATION message to BSC informing the BSC this
failure. See GSM 0508 protocol.
− The timer expires when BSC waiting for the CLEAR COMMAND message from
MSC during outgoing BSC handover.
− In Intra-BSC handover procedure, the target cell sends Inter Clear Request to the
source cell when the timer for the target cell to wait for HANDOVER COMPLETE
from MS expires, in this case, this item is measured in the source cell.
− In Intra-BSC handover procedure, the source cell, excluding the source cell for
directed retry, measures the item when the timer for the source cell to wait for Inter
Clear Request with cause value HANDOVER COMPLETE from the target cell
expires.
− In Intra-BSC handover procedure, when the target cell AM/CM net-drive fails (due to
timeout or negative acknowledgement), the target cell sends Inter Clear Request to
source cell, in this case, this item is measured in the source cell.
− In the case that MS reverses to the original channel after intra BSC handover fails,
the source cell first releases the terrestrial connection but the AM/CM re-net-drive
fails (due to timeout or negative acknowledgement). In this case this item is measured
in the source cell.
− The resource of the lower_priority call will be preempted by the higher_priority call
if MSC and BSC both support preemption, which will cause call drop.
− This item is measured when the RSL link of the TRX that the call is using
disconnects, which will cause call drop.
AM/CM net-drive: In assignment procedure or handover procedure, BSC establishes the terrestrial
connection in A-interface for a MS after it has successfully allocated radio channel.
Formula: none
Successful TCH Seizures
Description: in very early assignment procedure, assignment procedure, and handover
procedure, BSC measures this item when MS successfully seizes the allocated TCH. The
successful directed retry is also measured as successful TCH seizure: If there is no
available channel after ASSIGNMENT REQUEST message from MSC is sent to the cell
of the BSC and the system supports directed retry, then BSC initiates outgoing cell
handover according to the information about adjacent cell in MS’s MR.
Measurement point: this item is measured if TCH is successfully seized by the following
processes:
− Upon BSC’s reception of CHANNEL ACTIVATION ACKNOWLEDGE message
from BTS in very early assignment TCH process.
− In the case the target cell of directed retry is located in other BSC and directed retry
succeeds, MSC sends CLEAR COMMAND message to the originating BSC to
release the original connection. This item is measured when the originating BSC
receives this message.

3-20
Issue 02 (2008-10-07)
− In the case the directed retry target cell is located in the same BSC and the directed
retry succeeds, target cell sends Inter Clear Request message to the source cell to
request to release the resource and the original connection. This item is measured
when the source cell receives this message.
− This item is measured when BSC sends ASSIGNMENT COMPLETE message to
MSC after the assignment procedure is successfully implemented.
− In incoming BSC handover procedure, MS sends HANDOVER ACCESS message to
the BSC. This item is measured when BSC receives HANDOVER DETECT message
from BTS.
− In the process of incoming internal inter cell handover and intracell handover in BSC,
MS sends HANDOVER ACCESS message to BSC. BSC measures this item in the
target cell when receiving HANDOVER DETECTION message from BTS.
Formula: none
TCH Call Drop
Description: in assignment procedure and traffic channel handover procedure, BSC
measures TCH call drop when the process implementation fails due to some reason after
MS has accessed the TCH assigned by BSC. Or this item is measured when call drop
takes place due to some reason when MS is in normal seizure of TCH. After the above
cases occur, BSC sends CLEAR REQUEST message to MSC to request to clear the call.
Measurement point: this item is measured if call drop occurs on TCH in the following
processes.Figure 3-12, Figure 3-13, Figure 3-14 A1 and A2 indicate the main
measurement points.
− In the case TCH serves as traffic channel, this item is measured when BSC receives
ERROR INDICATION message from BTS due to an abnormal case for a radio link
layer connection. See GSM 0858 protocol.
− In the case TCH is seized as traffic channel, this item is measured when BSC receives
the CONNECT FAILURE INDICATION message from BTS due to an active
connection has been broken for some reason such as TCH link failure or hardware
failure etc. See GSM 0508 for details.
− In the case TCH serves as traffic channel, this item is measured when incoming BSC
handover is initiated and the timer for the target cell to wait for HANDOVER
COMPLETE message expires.
− In the case TCH serves as traffic channel, this item is measured when outgoing BSC
handover is initiated and the timer for the source cell to wait for CLEAR
COMMAND message from MSC expires (T8 expires).
− In Intra-BSC handover procedure, the target cell sends Inter Clear Request to the
source cell when the timer for the target cell to wait for HANDOVER COMPLETE
from MS expires, in this case, this item is measured in the source cell.
− In Intra-BSC handover procedure, the source cell, excluding the source cell for
directed retry, measures the item when the timer for the source cell to wait for Inter
Clear Request with cause value HANDOVER COMPLETE from the target cell
expires.
− In Intra-BSC handover procedure, when the target cell AM/CM net-drive fails (due to
timeout or negative acknowledgement), the target cell sends Inter Clear Request to
source cell, in this case, this item is measured in the source cell.
− In the case that MS reverses to the original channel after intra BSC handover fails,
the source cell first releases the terrestrial connection but the AM/CM re-net-drive
fails (due to timeout or negative acknowledgement). In this case this item is measured
in the source cell.

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− The resource of the lower_priority call will be preempted by the higher_priority call
if MSC and BSC both support preemption, which will cause call drop.
− This item is measured when the RSL link of the TRX that the call is using
disconnects, which will cause call drop.
Formula: none.
Figure 3-12 TCH drop for assignment
MS BTS BSC
ASSIGN CMMAND
MSC
ASSIGNMENT REQUEST
SABM
UA
CHANNEL ACTICATION
CHANNEL ACTIVATION ACK
A1
ERROR INDICATION
CONNECTION FAILURE INDICATION
A2
A1, A2: TCH call drop (BSC)
Figure 3-13 Drop for Intra BSC handover
MS BSC' BSC Ori-Cell
HANDOVER ACCESS
UA
BSC Tag-Cell BSC''
HANDOVER COMMAND
HANDOVER DETECT
CH ACT
CH ACT ACK
A1
ERROR INDICATION
A2
SABM
A1, A2: TCH drop for very early assignment (BSC), TCH call drop (BSC)

3-22
Issue 02 (2008-10-07)
Figure 3-14 Incoming BSC TCH handover procedure
MS Other BSC
HANDOVER ACCESS
UA
HANDOVER REQUIRED
HANDOVER COMMAND
HANDOVER DETECT
CH ACT
CH ACT ACK
MSC
A1
ERROR INDICATION
A2
SABM
HANDOVER REQUEST
A1, A2: TCH drop for very early assignment (BSC), TCH call drop (BSC)
Successful TCH Seizures for Early Assignment
Description: BSC measures this item when MS successfully seizes the TCH assigned by
the network in early assignment procedure (including the MS access for various
reasons).
Measurement point: the measurement points of this item are indicated in Figure 3-15 A1.
This item is measured when BSC receives CHANNEL ACTIVATION
ACKNOWLEDGE message from BTS in early assignment TCH process.
Formula: none
Figure 3-15 Successful TCH seizures for very early assignment procedure
MS BTS BSC
1.CHANNEL REQUEST
2.CHANNEL REQUIRED
ACKNOWLEDGE
5.IMMEDIATE ASSIGN CMMAND A1
ESTABLISH INDICATION(SAPI=0)
A1:Successful TCH seizures for very early assignment

Issue 02 (2008-10-07)
3-23
TCH Drop for Very Early Assignment
Description: In intraBSC or inter BSC handover procedure, if a handover occurs on TCH
and the speech data indication is signaling, this handover is regarded as a signaling
channel handover. BSC measures this item if MS has accessed the TCH assigned by
BSC but the implementation of the signaling channel handover fails due to some reason.
BSC also measures this item when call drop occurs due to some reason after MS has
established the normal connection on TCH and the speech data indication is signaling.
When the above cases occur, BSC sends a CLEAR REQUEST message to MSC to clear
the current connection.
Measurement point: this item is measured if the channel type in the following cases is
TCH. The A1 and A2 in Figure 3-13 ,Figure 3-14 and Figure 3-16 indicate the main
measurement points of this item.
− In the case TCH is seized as signaling channel, this item is measured when BSC
receives ERROR INDICATION message from BTS due to an abnormal case for a
radio link layer connection. See GSM 0858 protocol.
− In the case TCH is seized as signaling channel, this item is measured when BSC
receives CONNECTION FAILURE INDICATION message from BTS due to an
active connection has been broken for some reason such as TCH link failure or
hardware failure etc. See GSM 0858 protocol for details.
− In the case TCH is seized as signaling channel, in incoming BSC handover procedure,
this item is measured in the target cell in the case of the failure of decoding
HANDOVER DETECTION and HANDOVER COMPLETE message.
− In the case TCH serves as signaling channel, this item is measured when incoming
BSC handover is initiated and the timer for the target cell to wait for HANDOVER
− In the case TCH serves as signaling channel, this item is measured when outgoing
BSC handover is initiated and the timer for the source cell to wait for CLEAR
COMMAND message from MSC expires (T8 expires).
− In the case TCH is seized as signaling channel, in Intra-BSC handover procedure, this
item is measured in the source cell when the timer for the target cell or the source cell
to wait for HANDOVER COMPLETE expires.
− In the case TCH is seized as signaling channel, The resource of the lower_priority
call will be preempted by the higher_priority call if MSC and BSC both supports
preemption, which will cause call drop.
− In the case TCH is seized as signaling channel, this item is measured when the RSL
link of the TRX that the call is using disconnects, which will cause call drop.
Formula: none

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Issue 02 (2008-10-07)
Figure 3-16 TCH drop for very early assignment
MS BTS BSC
CHANNEL REQUEST
CHANNEL REQUIRED
CHANNEL ACTIVATION
EST_IND
A1
SABM
UA
ERROR INDICATION
A2
A1, A2: TCH drop for very early assignment (BSC)
Attempted SDCCH Seizures (all)
Description: in immediate assignment procedure, MS sends CHANNEL REQUEST to
BTS to request radio channel. In incoming BSC handover procedure, MSC requests
radio resource by sending HANDOVER REQUEST to BSC. In intra BSC handover,
BSC itself requests a new channel for call. In those cases, this item is measured when
BSC receives SDCCH allocation request.
Measurement point: the measurement point of this item is described in Figure 3-17,
Figure 3-18 and Figure 3-19 SD-ATT-BSC1--SD-ATT- BSC3.
− In immediate assignment procedure, BSC measure this item when it receives
CHANNEL REQUIRED message from MS and if the requested channel type is
SDCCH.
− For intra BSC handover on SDCCH, this item is measured when the target cell
receives Intercell Handover Request message (Huawei defined message) from the
source cell.
− This item is measured if when Huawei BSC receives HANDOVER REQUEST
message from other BSC and the handover is taken place on SDCCH.
Formula: none

Issue 02 (2008-10-07)
3-25
Figure 3-17 Immediate assignment procedure-channel seizure procedure
MS BTS BSC
CHANNEL REQUEST
CHANNEL REQUIRED
CHANNEL ACTIVATION
SD-ATT-BSC1
EST_IND
SD -ATT-BSC1: Attempted SDCCH seizures (all)
MS BTS' BSC Ori-Cell
HANDOVER ACCESS
UA
BSC Des-Cell BTS''
MR
Handover algorithm
HANDOVER COMMAND
HANDOVER DETECT
CH ACT
CH ACT ACK
HANDOVER COMPLETE
Inter Clear Request
(Handover Success)
SD-ATT-BSC2
SABM
SD-ATT-BSC2: Attempted SDCCH seizures (all)

3-26
Issue 02 (2008-10-07)
MS Other BSC
HANDOVER ACCESS
UA
HANDOVER REQUIRED
HANDOVER COMMAND
HANDOVER DETECT
CH ACT
CH ACT ACK
HANDOVER COMPLETE
SD-ATT-BSC3
MSC
QUEUEING INDICATION
SABM
HANDOVER REQUEST
SD -ATT-BSC3: Attempted TCH seizures (all)
Successful SDCCH Seizures
Description: in immediate assignment procedure, assignment procedure, and handover
procedure, this item is measured when BSC receives the notification from MS that MS
has successfully seized the assigned SDCCH.
Measurement point:
− In immediate SDCCH assignment procedure, this item is measured when BSC
receives CHANNEL ACTIVATION ACKNOWLEDGE message from BTS.
− In the process of incoming BSC handover on SDCCH, BTS sends HANDOVER
DETECTION message to BSC. This item is measured when BSC receives
HANDOVER DETECTION.
− In the process of incoming internal inter cell handover and intracell handover in BSC,
BTS sends HANDOVER DETECTION message to BSC. BSC measures this item in
the target cell when receiving this message.
Formula: none
Attempted SDCCH Seizures Meeting SDCCH Overflow
Description: in immediate assignment procedure and handover procedure, this item is
measured if there is no available SDCCH for assignment when MS or MSC requests
BSS to assign SDCCH.
Measurement point: this item is measured if there is no available SDCCH when SDCCH
is requested in the following cases:
− BSC receives CHANNEL REQUIRED message from BTS.
− BSC receives Intercell Handover Request message from other cell in the same BSC.
− BSC receives HANDOVER REQUEST message from other BSC.
Formula: none

Issue 02 (2008-10-07)
3-27
SDCCH Call Drop
Description: in immediate assignment procedure and handover procedure, BSC measures
SDCCH call drop when the process implementation fails due to some reason after MS
has accessed the SDCCH assigned by BSC. Or this item is measured when call drop
takes place due to some reason when MS is in normal seizure of SDCCH. After the
above cases occur, BSC sends CLEAR REQUEST message to MSC.
Measurement point:
− This item is measured when BSC receives ERROR INDICATION message from BTS
due to an abnormal case for a radio link layer connection.
− This item is measured when BSC receives CONNECTION FAILURE INDICATION
message from BTS because an active connection has been broken for some reason
such as SDCCH link failure or hardware failure (see GSM 0508 for details).
− In incoming BSC handover procedure on SDCCH, this item is measured in the target
cell in the case of the failure of decoding HANDOVER DETECTION and
HANDOVER COMPLETE message.
− In the process of incoming BSC handover on SDCCH, this item is measured in the
target cell when the timer for the target cell to wait for the HANDOVER
− In the process outgoing BSC handover on SDCCH, this item is measured when the
timer for the source cell to wait for CLEAR COMMAND message from MSC expires
(T8 expires).
− In the process of intra BSC handover on SDCCH, this item is measured in the source
cell when the timer for the source cell or the target cell to wait for HANDOVER
− This item is measured when the RSL link of the TRX that the call is running on
disconnect, which will cause call drop, this item measures call drop on SDCCH for
RSL disconnection.
Formula: none
Assignment Requests
Description: the initial random access by the MS and "Immediate Assignment" to a
DCCH is handled autonomously by the BSS without reference to the MSC. After the RR
connection is established between MS and BSS, MS establishes the MM and CC
connection with MSC on this channel. MSC allocates or reallocates to the MS a radio
(and possibly terrestrial) resource in ASSIGNMENT REQUEST message according to
MS’s CC connection request.
Measurement point: as shown in Figure 3-20 A1, this item is measured when BSC
receives ASSIGNMENT REQUEST message from MSC.
Formula: none

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Issue 02 (2008-10-07)
Figure 3-20 Assignment implementation process
MS BTS BSC
ASSIGN CMMAND
A1
MSC
ASSIGNMENT REQUEST
SABM
UA
ASSIGNMENT COMPLETE
(directly retry)HANDOVER REQIRED
MODE (MODIFY)
MODE (MODIFY) ACKNOLEDGE
(NEGATIVE ACKNOWLEDGE,REJECT)
(directly retry)HANDOVER FAILURE(REQUEST ACKNOWLEDGE)
CHANNEL ACKTIVATION
CHANNEL ACKTIVATION ACKNOWLEDGE (NACK)
ASSIGNMENT COMPLETE
In Immediate Assignment or
IntraBSC Handover
ASS FAILURE
H 4
B 2
B 3
B 4B 5
C1
C 2
D1
E1
F1
F1
F2
F3
F3
F3
G1
G 2
G 3
G4
G6
G5
G5
B6
H 2
H 3
H 3
ASS FAILURE
ASS FAILURE
A1: Assignment requests B2-B6: Unsuccessful assignments (equipment failure)
C1-C2: Unsuccessful assignments
(requested terrestrial resource unavailable)
D1: Unsuccessful assignments (terrestrial circuit
already allocated)
E1:Unsuccessful assignments (invalid
message contents))
F1-F3: Unsuccessful assignments (radio interface
failure, reversion to previous channel))
G1-G6: Unsuccessful assignments (no radio
resource available))
H2-H4: Unsuccessful assignments (other causes))
Unsuccessful Assignments
Description: BSS might fail to implement the assignment procedure due to some reason
after receiving ASSIGNMENT REQUEST message from MSC.

Issue 02 (2008-10-07)
3-29
The relation between queues, directed retry and mode modify in assignment procedure.
In assignment procedure, upon reception of ASSIGNMENT REQUEST message, BSC first checks CIC
resource, then analyzes the CHANNEL TYPE in the message (See GSM 0808), at last compares the
analyzed CHANNEL TYPE with the currently seized one. The comparison result leads to three types of
options: mode modify, directed retry, or requesting a new channel.
CHANNEL TYPE contains channel rate and type and traffic type (speech/data indicator), speech
encoding algorithm and transparency indicator.
The channel re-allocation is initiated if the channel rate or type is different.
The mode modify is initiated if the traffic type (speech/data indicator), or speech encoding
algorithm/transparency indicator is different.
If all are consistent, the system uses the existing radio channel and allocates CIC for BSC net-drive.
So there are 5 subsequent processes after the reception of ASSIGNMENT REQUEST.
1. Mode modify.
2. Queue (if there is no available channel during re-allocation and the system supports queue).
3. Directed retry (if there is no available channel during re-allocation and the system supports directed
retry).
4. No available channel after the queue timeout; directed retry again if the system supports directed
retry.
5. Normal assignment: new channel is assigned, activated, and then is normally seized by the MS.
Measurement point: as shown in Figure 3-20 if BSS fails to respond to ASSIGNMENT
COMPLETE message to MSC due to some reason after receiving ASSIGNMENT
REQUEST message, this item is measured and BSS responds ASSIGNMENT FAILURE
message to MSC simultaneously. Figure 3-20 shows the reasons for unsuccessful
assignment. This item is measured for the unsuccessful assignment caused by any of
these reasons.
Formula: none
Unsuccessful Assignments (Equipment Failure)
Description: the sum of unsuccessful assignments due to equipment failure. See
Unsuccessful Assignments for the process.
Measurement point: as shown in Figure 3-20 B2~B6, this item is measured in the
following case.
− In assignment procedure, BSC assigns terrestrial circuit according to the CIC
specified by MSC but the assignment fails. In this case, this item is measured and
BSC requests MSC to clear the connection simultaneously.
− In assignment procedure, this item is measured if BSC’s AM/CM net-drive fails
(AM/CM returns net-drive failure or responds timeout) after the mode modify is
implemented and the radio channel has been successfully modified according to the
CHANNEL TYPE required by MSC.
− If mode modify is initiated in assignment procedure, this item is measured when BSC
receives MODE MODIFY NEGATIVE ACKNOWLEDGE message from BTS
indicating the failure of mode modify after the MODE MODIFY message is sent to
BTS.
− If mode modify is initiated in assignment procedure, this item is measured when the
timer for BSC to wait for the response expires after the MODE MODIFY message
has been sent to BTS.
− In assignment procedure, this item is measured when BSC receives Channel
Activation NACK or the timer for BSC to wait for Channel Activation ACK expires.
Formula: none

3-30
Issue 02 (2008-10-07)
Unsuccessful Assignments (Requested Terrestrial Resource Unavailable)
Description: Unsuccessful assignments due to the requested terrestrial resource
unavailable. See Unsuccessful Assignments for the process.
Measurement point: as shown in Figure 3-20 C1~C2:
− This item is measured when BSC detects the state of CIC requested in the
ASSIGNMENT REQUEST message received from MSC is unavailable.
− This item is measured when AM/CM net-drive fails (AM/CM returns net-drive
rejection or timer for waiting for AM/CM expires) in assignment procedure,.
− Formula: none
Unsuccessful Assignments (Terrestrial Circuit Already Allocated)
Description: unsuccessful assignments due to terrestrial circuit already allocated. See
Measurement point: as shown in Figure 3-20 D1, in assignment procedure, this item is
measured when BSC detects the CIC requested in the ASSIGNMENT REQUEST
message received from MSC has already been allocated.
Formula: none
Unsuccessful Assignments (Invalid Message Contents)
Description: unsuccessful assignments due to invalid message contents. See
Measurement point: as shown in Figure 3-20 E1, this item is measured when BSC
detects the ASSIGNMENT REQUEST message contains invalid contents during the
message decoding, Which includes CHANNEL TYPE, CIC, Layer 3 header information.
Formula: none
Unsuccessful Assignments (Radio Interface Failure, Reversion To Previous
Channel)
Description: unsuccessful assignments due to radio interface failure with reversion to
previous channel
Measurement point: as shown in Figure 3-20 F1-F3:
− BSC measures this item when MS fails to access the new channel and reverses to the
old signaling channel due to Um interface failures after it receives the
ASSIGNMENT COMMAND message.
− in assignment procedure, after sending the ASSIGNMENT COMMAND message, if
the timer for BSC to wait for ASSIGNMENT COMPLETE message from MS expires,
BSC measures this item and informs MSC to clear the connection simultaneously.
Formula: none
Unsuccessful Assignments (No Radio Resource Available)
Description: unsuccessful assignments due to no radio resource available. See
Measurement point: as shown in Figure 3-20 G1-G6,
− This item is measured when BSC does not support the assigned channel.

Issue 02 (2008-10-07)
3-31
− This item is measured if there is no available channel when BSC assigns the channel
after receiving ASSIGNMENT REQUEST message and BSC does not support queue
and directed retry.
− If mode modify is initiated in assignment procedure, the CHANNEL MODE
MODIFY message is sent to the MS, then the MS implement mode modify and
response CHANNEL MODE MODIFY ACKNOWLEDGE to BSC. This item is
measured when BSC receives this message from MS but meets error when decode
channel mode IE.
− If there is no available channel when BSC receives ASSINGMENT REQUEST
message and the system supports queue, the assignment procedure waits for channel
resource; if idle channel is available before the timer expires, the system allocates the
channel successfully and the assignment procedure goes normally; if there still no
available channel resource after the timer expires and the call doesn’t support directed
retry, BSC measures the unsuccessful assignment due to channel unavailable.
− If directed retry fails, this item is measured and ASSIGNMENT FAILURE message
is sent to MSC to request to clear the connection if the source cell of directed retry is
in one of the following cases.
a) There is no available target cell in the MR reported from MS, for directed retry selects the
target cell of handover according to the MR.
b) This item is measured in the source cell if the source cell receives Intercell Handover
Reject message from the target cell when directed retry is trying to select other cell in the
BSC.
c) This item is measured in the source cell if the MS reverses to the original signaling channel
when directed retry is trying to select other cell in the BSC.
d) This item is measured in the source cell when the timer for source cell to wait for response
from target cell expires when directed retry is trying to select other cell in the BSC.
e) When directed retry is trying to select other cell in the BSC, the source cell receives Inter
Clear Request message (Huawei defined message) from the target cell. However this message
is not the one to inform the handover completion but to inform the source cell of the directed
retry failure and to request to clear the connection. In this case, this item is measured in the
source cell.
f) When directed retry is trying to select other cell in the BSC, the source cell sends
HANDOVER COMMAND to MS to request the MS to access the new channel. This item is
measured if the source cell has not received Inter Clear Request message (Huawei defined
message) from the target cell after the timer expires.
If directed retry is trying to select the target cell in other BSC and the directed retry process fails, the
source cell does not return assignment failure and the failure is not measured as an assignment failure
item. The failure is processed according to handover procedure.
Formula: none
Unsuccessful Assignments (Other Causes)
Description: unsuccessful assignments due to the following causes. See Unsuccessful
Assignments for the process.
Measurement point: as shown in Figure 3-20 H2-H4,
− When BSC detects IEs, such as, channel rate and type, speed encoding algorithm, is
incorrectly described in ASSIGNMENT REQUEST message.

3-32
Issue 02 (2008-10-07)
− In assignment procedure, BSC measures the item if the timer for BSC to wait for
ESTABLISH INDICATION expires when the ASSIGNMENT COMMAND message
has been sent to MS In this case BSC sends clear request to MSC to clear the
connection simultaneously.
− If mode modify is initiated in assignment procedure, BSC does not receive the
acknowledge message from MS after sending mode modify message, which leads to
the timeout of BSC.
Formula: none
Unsuccessful Channel Activation During Assignment (NACK)
Description: See Unsuccessful Assignments.
Measurement point: this item is measured when BSC receives CHANNEL
ACTIVATION NEGATIVE ACKNOWLEDGE message from BTS after sending
CHANNEL ACTIVATION message to BTS to activate the newly- allocated channel.
Formula: none
Channel Activation Timeout During Assignment
Description: See Unsuccessful Assignments.
Measurement point: this item is measured when the timer for BSC to wait for
CHANNEL ACTIVATION ACKNOWLEDGE from BTS expires after sending
CHANNEL ACTIVATION message to BTS to activate the newly- allocated channel.
Formula: none
Sum of TCH Measurements (Excluding Very Early Assignment)
Description: This item measures the number of occupied TCH of BSC within the
measurement period (excluding the very early assignment). This item reflects the
situation that the MSs within a BSC occupy the TCH resources from the aspect of
occupied TCH number.
Measurement point: the system measures the busy TCH number (excluding the very
early assignment) every 5 seconds and sums the measurement value of each sampling
point and then divides the total value by the sampling times.
Formula: none
Sum of 1800/1900 Cell TCH Measurements(Excluding Very Early Assignment)
1. Description: This item measures the number of occupied TCH of 1800/1900 cell within
the measurement period (excluding the very early assignment). This item reflects the
situation that the MSs within an 1800/1900 cell occupy the TCH resources from the
aspect of occupied TCH number.
Measurement point: the system measures the busy TCH number (excluding the very
early assignment) every 5 seconds and sums the measurement value of each sampling
point and then divides the total value by the sampling times..
Formula: none
Sum of Full Rate TCH Measurements (Excluding Very Early Assignment)
Meaning: This item measures the number of occupied full rate TCH of BSC within the

Issue 02 (2008-10-07)
3-33
situation that the MSs within a BSC occupy the full rate TCH resources from the
aspect of occupied full rate TCH number.
Measurement point: the system measures the busy full rate TCH number (excluding the
very early assignment) every 5 seconds and sums the measurement value of each
sampling point and then divides the total value by the sampling times.
Formula: None.
Sum of Half Rate TCH Measurements (Excluding Very Early Assignment)
Meaning: This item measures the number of occupied half rate TCH of BSC within the
situation that the MSs within a BSC occupy the half rate TCH resources from the
aspect of occupied half rate TCH number.
Measurement point: the system measures the busy half rate TCH number (excluding the
Formula: None.
Sum of 1800/1900 Cell Full Rate TCH Measurements (Excluding Very Early
Assignment)
Meaning: This item measures the number of occupied full rate TCH of 1800/1900 cell
within the measurement period (excluding the very early assignment). This item reflects
the situation that the MSs within an 1800/1900 cell occupy the full rate TCH resources
from the aspect of occupied full rate TCH number.
Measurement point: the system measures the busy full rate TCH number (excluding the
Formula: None.
Sum of 1800/1900 Cell Half Rate TCH Measurements (Excluding Very Early
Assignment)
Meaning: This item measures the number of occupied half rate TCH of 1800/1900 cell
within the measurement period (excluding the very early assignment). This item reflects
the situation that the MSs within an 1800/1900 cell occupy the half rate TCH resources
from the aspect of occupied half rate TCH number.
Measurement point: the system measures the busy half rate TCH number (excluding the
Formula: None.
Sum of Configured TRX in the BSC
Description: the sum of actually configured TRXs in the BSC.
Measurement point: the configured TRXs that are shown in statistic database as "install"
are measured every time at the end of a statistic cycle.
Formula: none
Sum of Available TRX in the BSC
Description: sum of TRXs that managed by BSC and are in normal use state.

3-34
Issue 02 (2008-10-07)
Measurement point: this item is measured at the end of a statistic cycle.
Formula: none
Assignment Requests With Signaling Channel
Meaning: When there is a short message sent to a MS which is engaged in a conversation
(seizing a TCH), MSC may issue ASSIGNMENT REQUEST to assign a signaling
channel for short message transmission. Since MS has already seized voice channel after
channel assignment, and this voice channel can be used to send short message, BSC only
needs to return ASSIGNMENT COMPLETE to MSC indicating that channel assignment
is completed. After conversation and short message is complete, MSC issues CLEAR
COMMAND to initiate release procedure. This item provides the times of
ASSIGNMENT REQUEST from MSC to BSC being used to establish signaling
connections.
Measurement point: As shown in Figure 3-21 A, this item is measured when BSC
receives ASSIGNMENT REQUEST from MSC which is used to assign resource for
signaling connection establishment.
Formula: None.
Figure 3-21 Signaling channel request procedure
BSC
A
MSC
B
ASSIGNMENT REQUEST
ASSIGNMENT COMPLETE
ACTIVE CALL
A: Times of signaling channel assignment request
B: Times of successful signaling channel assignment
Successful Assignments With Signaling Channel
Meaning: When there is a short message sent to a MS which is engaged in a conversation
(seizing a TCH), iMSC may issue ASSIGNMENT REQUEST to assign a signaling
channel for short message transmission. Since MS has already seized voice channel after
channel assignment, and this voice channel can be used to send short message, BSC only
needs to return ASSIGNMENT COMPLETE to MSC indicating that channel assignment
is completed. After conversation and short message is complete, MSC issues CLEAR
COMMAND to initiate release procedure. This item provides the times of
ASSIGNMENT REQUEST from MSC to BSC beng used to establish signaling
connections, and after which BSC returns ASSIGNMENT COMPLETE to MSC.
Measurement point: As shown in Figure 3-21 B, this item is measured when BSC returns
ASSIGNMENT COMPLETE to MSC after BSC receives ASSIGNMENT REQUEST
from MSC which is used to assign resource for signaling connection establishment.
Formula: None.

Issue 02 (2008-10-07)
3-35
Average number of A-interface circuits(uninstall)
Meaning: the average circuit number that are in the “not installed” state in the A interface
within a statistic period.
Measurement point: BSC measures the circuit number that are in the unconfigured state
in the A interface every 5 seconds.
Formula: None.
Average number of A-interface circuits(Fault)
Meaning: the average circuit number that are in the faulty state in the A interface within a
statistic period.
Measurement point: BSC measures the faulty circuit number in the A interface every 5
seconds.
Formula: None.
Average number of A-interface circuits(Maintenance)
Meaning: the average circuit number that are in the maintenance state in the A interface
within a statistic period.
Measurement point: BSC measures the circuit number that are in the maintenance state
in the A interface every 5 seconds.
Formula: None.
Average number of A-interface circuits(Blocked)
Meaning: the average circuit number whose local ends are in the blocked state in the A
interface within a statistic period.
Measurement point: BSC measures the circuit number whose local ends are in the
blocked state in the A interface every 5 seconds.
Formula: None.
Average number of A-interface circuits(Idle)
Meaning: the average circuit number that are in the idle state in the A interface within a
statistic period.
Measurement point: BSC measures the circuit number that are in the idle state in the A
interface every 5 seconds.
Formula: None.
Average number of A-interface circuits(Busy)
Meaning: the average circuit number that are in the busy state in the A interface within a
statistic period.
Measurement point: BSC measures the circuit number that are in the busy state in the A
interface every 5 seconds.
Formula: None.
Average number of A-interface circuits(Opposite Uninstall)
Meaning: the average circuit number whose peer ends are in the “not installed” state in
the A interface within a statistic period.

3-36
Issue 02 (2008-10-07)
Measurement point: BSC measures the circuit number whose peer ends are in the
blocked state in the A interface every 5 seconds.
Formula: None
Number of Configured A-Interface Circuits
Meaning: the average circuit number in the A interface within a statistic period.
Measurement point: None.
Formula: Average+Average number of A-interface circuits+Average number of
A-interface circuits+Average number of A-interface circuits(Blocked) + Average number
of A-interface circuits(Idle) + Average number of A-interface circuits(Busy) + Average
number of A-interface circuits(Opposite Uninstall)
Percent of A-Interface Circuit (Uninstall) (%)
Meaning: the ratio of Average number of A-interface circuits to Number of Configured
A-Interface Circuits.
Formula: Average / Number of Configured A-Interface Circuits
Percent of A-Interface Circuit (Fault) (%)
A-Interface Circuits
Percent of A-Interface Circuits (Maintenance) (%)
Percent of A-Interface Circuits (Blocked) (%)
Meaning: the ratio of Average number of A-interface circuits(Blocked) to Number of
Configured A-Interface Circuits
Percent of A-Interface Circuits (Idle) (%)
Meaning: the ratio of Average number of A-interface circuits(Idle) to Number of
Configured A-Interface Circuits
Percent of A-Interface Circuits (Busy) (%)
Meaning: the ratio of Average A-interface circuits (Busy) to Number of Configured

Issue 02 (2008-10-07)
3-37
Formula: Average A-interface circuits (Busy) / Number of Configured A-Interface
Circuits
Percent of A-Interface Circuits (Opposite Uninstall) (%)
Meaning: the ratio of Average number of A-interface circuits(Opposite Uninstall) to
Number of Configured A-Interface Circuits
TCH Channel Allocation Failure (No Available License)
Meaning: because no idle half rate is available.
Measurement Point: this item is measured when there is no available TCH when License
controls BSC to request TCH.
Formula: none.
Circuit Paging Success Rate
Description: See Successful Circuit Pagings of Abis Interface and Number of PAGING
REQUESTs for CS Service on the A Interface and Number of PAGING REQUESTs for
CS Service on the Pb Interface.
Measurement point: none.
Formula: Successful circuit paging of Abis interface / (Number of PAGING REQUESTs
for CS Service on the A Interface + Number of PAGING REQUESTs for CS Service on
the Pb Interface.)
Ratio of Paging Channel Overloads (%)
Description: This item measures the percentage of PCH overloads in the paging
commands to BTS. See Interface, and Packet Paging Commands to BTS.
Formula: Circuit paging PCH overloads of Abis interface / (Circuit paging commands to
BTS + Packet paging commands to BTS)
Rate of Sending Immediate Assignment Command
Description: See Immediate Assignment Transmissions and Immediate Assignment
Requests.
Formula: Immediate assignment transmissions / Immediate assignment requests
TCH Call Drop Rate (%)
Description: This item measures the percentage of TCH call drops in successful TCH
seizures. See TCH Call Drop and Successful TCH Seizures.
Formula: TCH call drop / Successful TCH seizures

3-38
Issue 02 (2008-10-07)
Traffic Volume (Excluding Very Early Assignment) (Erl)
Description: This item measures the total traffic volume of all cells in a BSC, excluding
the traffic volume during very early assignment, that is the average number of busy
TCHs(excluding very early assignment) after all TCHs of all cells are scaned.
Formula: None.
Traffic Volume Of 1800/1900 Cell (Excluding Very Early Assignment) (Erl)
Description: This item measures the total traffic volume of all GSM 1800/1900 cells in a
BSC, excluding the traffic volume during very early assignment, that is the average
number of busy TCHs(excluding very early assignment) of 1800/1900 cells after all
TCHs of all 1800/1900 cells are scaned.
Formula: None.
Percentage of TRX In Good Condition (%)
Description: This item measures the percentage of good TRXs in total configured TRXs.
See Sum of Available TRX in the BSC and Sum of Configured TRX in the BSC.
Formula: Sum of available TRX in the BSC / Sum of configured TRX in the BSC
SDCCH Call Drop Rate (%)
Description: This item measures the percentage of SDCCH call drops successful
SDCCH seizures. See SDCCH Call Drop and Successful SDCCH Seizures.
Formula: SDCCH call drop / Successful SDCCH seizures
SDCCH Congestion Rate (SDCCH Overflow) (%)
Description: This item measures the percentage of the attempted SDCCH seizures
meeting congestion in total attempted SDCCH seizures. See Attempted SDCCH Seizures
Meeting SDCCH Overflow and Attempted SDCCH Seizures (all).
Formula: Attempted SDCCH seizures meeting an SDCCH blocked state / Attempted
SDCCH seizures (all)
Full Rate Traffic Volume (Excluding Very Early Assignment) (ERL)
Meaning: This item provides the traffic volume on full rate TCHs of all cells (including
900/850 and 1800/1900) of the measured BSC, excluding the traffic on full rate TCH of
very early assignment, that is, the average number of busy full rate TCHs(excluding very
early assignment) after all full rate TCHs of all cells are scaned.
Formula:None

Issue 02 (2008-10-07)
3-39
Half Rate Traffic Volume (Excluding Very Early Assignment) (ERL)
Meaning: This item provides the traffic volume on half rate TCHs of all cells (including
900/850 and 1800/1900) of the measured BSC, excluding the traffic on half rate TCH of
very early assignment, that is, the average number of busy half rate TCHs (excluding
very early assignment) after all half rate TCHs in all cells are scaned
Formula:None.
Full rate Traffic Volume Of 1800/1900 Cell (Excluding Very Early Assignment)
(ERL)
Meaning: This item provides the traffic volume on full rate TCHs of all 1800/1900 cells
of the measured BSC, excluding the traffic on full rate TCH of very early assignment,
that is, the average number of busy full rate TCHs (excluding very early assignment)
after all full rate TCHs of 1800/1900 cells are scaned.
Formula: None.
Half Rate Traffic Volume Of 1800/1900 Cell (Excluding Very Early Assignment)
(ERL)
Meaning: This item provides the traffic volume on half rate TCHs of all 1800/1900 cells
of the measured BSC, excluding the traffic on half rate TCH of very early assignment,
that is, the average number of busy half rate TCHs (excluding very early assignment)
after all half rate TCHs in 1800/1900 cells are scaned.
Formula: None
3.1.3 Access Measurement Function(2)
All the statistic items of Access Measurement Function (2) are listed in Table 3-2.
Table 3-2 Statistic items in Access measurement function items(2)
1 Configured SDCCHs
2 Available SDCCHs
3 Configured TCHs
4 Available TCHs
5 Available SDCCH rate
6 Available TCH rate
Configured SDCCHs
Description: This item provides the real-time number of configured SDCCHs, including
the SDCCH converted from the dynamic TCH. It is an average of configured SDCCHs
obtained in a sample measurement period.

3-40
Issue 02 (2008-10-07)
Measurment point: the system acquires the number of configured SDCCHs every five
seconds. By the end of the measurement period, the system devides the sum of all
sample data obtained in the period by sampling times to calculate the average configured
SDCCHs measured in the measurment period.
Formula: none.
Available SDCCHs
Description: This item provides the number of available SDCCHs (including the
SDCCH converted from the dynamic TCH) which are in idle or busy status in the BSC
system. It is an average number of available SDCCHs obtained in a sample measurement
period.
Measurement point: the system acquires the number of available SDCCHs every five
sample data obtained in the period by sampling times to calculate the average available
SDCCHs measured in the measurment period.
Formula: none.
Configured TCHs
Description: This item provides the real-time number of configured TCHs (besides the
dynamical TCHs converted into SDCCHs but includes the TCHs converted from
dynamic PDCHs). It is an average of configured TCHs obtained in a sample
measurement period.
Measurement point: the system acquires the number of configured TCHs every five
sample data obtained in the period by sampling times to calculate the average configured
TCHs measured in the measurment period.
Formula: none.
Available TCHs
Description: This item provides the number of available TCHs (besides the dynamical
TCHs converted into SDCCHs but includes the TCHs converted from dynamic PDCHs)
which are in idle or busy status in the BSC system. It is an average number of available
TCHs obtained in a sample measurement period.
Measurement point: the system acquires the number of available TCHs every five
sample data obtained in the period by sampling times to calculate the average available
TCHs measured in the measurment period.
Formula:none.
Available SDCCH rate
Description: This item provides the percentage (%) of available SDCCHs to configured
SDCCHs. See Available SDCCHs, Configured SDCCHs.
Formula: Available SDCCHs/Configured SDCCHs
Available TCH rate
Description: This item provides the percentage (%) of available TCHs to configured
TCHs. See Available TCHs,. Configured SDCCHs

Issue 02 (2008-10-07)
3-41
Formula: Available TCHs/Configured TCHs
3.1.4 Handover Measurement Function(1)
All the statistic items of Handover Measurement Function(1) are listed in Table 3-3.
Table 3-3 Statistic items in Handover measurement function(1) items
No. Item name
1 Attempted Intracell Handovers
2 Successful Intracell Handovers
3 Unsuccessful Intracell Handovers,
4 Attempted Intercell Handovers
5 Intercell Handovers
6 Attempted Intercell Handovers (900/850(1800/1900)
7 Attempted Intercell Handovers (1800/1900(900/850)
8 Successful Intercell Handovers
9 Successful Intercell Handovers (900/850(1800/1900)
10 Successful Intercell Handovers (1800/1900(900/850)
11 Intra BSC Handovers
12 Attempted Incoming BSC Handovers
13 Attempted Incoming BSC Handovers (900/850(1800/1900)
14 Attempted Incoming BSC Handovers (1800/1900(900/850)
15 Attempted Incoming BSC Handovers (to 900/850)
16 Attempted Incoming BSC Handovers (to 1800/1900)
17 Successful Incoming BSC Handovers
18 Successful Incoming BSC Handovers (900/850(1800/1900)
19 Successful Incoming BSC Handovers (1800/1900(900/850)
20 Successful Incoming BSC Handovers (to 900/850)
21 Successful Incoming BSC Handovers (to 1800/1900)
22 Unsuccessful Incoming BSC Handovers
23 Unsuccessful Incoming BSC Handovers (Equipment Failure)
24
Unsuccessful Incoming BSC Handovers (Requested Terrestrial Resource
Unavailable)
25
Unsuccessful Incoming BSC Handovers (Terrestrial Circuit Already
Allocated)

01 03 traffic statistic items

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