KPI measurement

KPI Measurement per Cell
Description
The measurement unit KPI Measurement per Cell is used to measure the KPI of the BSC.
Measurement Object
CELL
Measurement Counter
The following table lists the measurement counters related to KPI Measurement per Cell.
Counter Refer to Section...
K3100:CELL_KPI_IMM_ASS_REQ Immediate Assignment Requests
K3101:CELL_KPI_IMM_ASS_CMD Immediate Assignment Commands
K3000:CELL_KPI_SD_REQ SDCCH Seizure Requests
K3001:CELL_KPI_SD_CONGEST Failed SDCCH Seizures due to Busy
SDCCH
K3003:CELL_KPI_SD_SUCC Successful SDCCH Seizures
K3004:CELL_KPI_SD_TRAF_ERL Traffic Volume on SDCCH
K3005:CELL_KPI_SD_AVAIL_NUM Available SDCCHs
K3006:CELL_KPI_SD_CFG_NUM Configured SDCCHs
K3020:CELL_KPI_TCH_REQ_SIG TCH Seizure Requests (Signaling
Channel)
K3021:CELL_KPI_TCH_CONG_SIG Failed TCH Seizures due to Busy TCH
(Signaling Channel)
K3023:CELL_KPI_TCH_SUCC_SIG Successful TCH Seizures (Signaling
Channel)
K3022:CELL_KPI_TCH_DROPS_SIG Call Drops on TCH (Signaling

Channel)
K3024:CELL_KPI_TCH_TRAF_ERL_SIG Traffic Volume on TCH (Signaling
Channel)
K3010A:CELL_KPI_TCH_ASS_REQ_TRAF TCH Seizure Requests (Traffic
Channel)
K3011A:CELL_KPI_TCH_ASS_CONG_TRAF Failed TCH Seizures due to Busy TCH
(Traffic Channel)
K3013A:CELL_KPI_TCH_ASS_SUCC_TRAF Successful TCH Seizures (Traffic
Channel)
K3012A:CELL_KPI_TCH_STATIC_DROPS_TRAF Call Drops on TCH in Stable State
(Traffic Channel)
K3010B:CELL_KPI_TCH_HO_REQ_TRAF TCH Seizure Requests in TCH
Handovers (Traffic Channel)
K3011B:CELL_KPI_TCH_HO_CONGEST_TRAF Failed TCH Seizures in TCH
Handovers due to Busy TCH (Traffic
Channel)
K3013B:CELL_KPI_TCH_HO_SUCC_TRAF Successful TCH Seizures in TCH
Handovers (Traffic Channel)
K3012B:CELL_KPI_TCH_HO_DROPS_TRAF Call Drops in TCH Handovers (Traffic
Channel)
K3014:CELL_KPI_TCH_TRAF_ERL_TRAF Traffic Volume on TCH
K3015:CELL_KPI_TCH_AVAIL_NUM Available TCHs
K3016:CELL_KPI_TCH_CFG_NUM Configured TCHs
K3170:CELL_KPI_DUBAND_HO_REQ Dual-Band Handover Requests

K3173:CELL_KPI_DUBAND_HO_SUCC Successful Dual-Band Handovers
K3041: CELL_TCH_OVERFLOW_RATE TCH Congestion Rate (Overflow)
K3043: CELL_TCH_SEIZ_SUCC_RATE TCH Seizure Success Rate
K3034: CELL_KPI_TCHH_TRAF_ERL TCHH Traffic Volume
RK3255: CELL_TRX_CFG_AVAIL_RATE TRX Usability
K3040: CELL_KPI_TCH_SUCC Successful TCH Seizures
K3045: CELL_KPI_TCH_CONGESTION_RATE Congestion Ratio on TCH (All
Channels Busy)
K3173F: CELL_KPI_DUBAND_HO_FAI Failed Dual-Band Handovers
RM3276: CELL_KPI_TCH_SUCC_SIG_TCHH Successful TCH Seizures (Signaling
Channel) (TCHH)
RM3176: CELL_KPI_TCH_SUCC_SIG_TCHF Successful TCH Seizures (Signaling
Channel) (TCHF)
RM3278:
CELL_KPI_TCH_ASS_SUCC_TRAF_TCHH
Successful TCH Seizures (Traffic
Channel) (TCHH)
RM3178:
CELL_KPI_TCH_ASS_SUCC_TRAF_TCHF
Successful TCH Seizures (Traffic
Channel) (TCHF)
RM3279:
CELL_KPI_TCH_HO_SUCC_TRAF_TCHH
Successful TCH Seizures in TCH
Handovers (Traffic Channel) (TCHH)
RM3179:
CELL_KPI_TCH_HO_SUCC_TRAF_TCHF
Successful TCH Seizures in TCH
Handovers (Traffic Channel) (TCHF)

1.K3100: CELL_KPI_IMM_ASS_REQ(Immediate
Assignment Requests)
Description
To obtain the service from the BSS, an MS sends a CHAN REQ message on the RACH to the
BTS. After receiving this message, the BTS sends a CHAN RQD message to the BSC to request
a dedicated channel.
This measurement provides the number of times that the BSC receives a CHAN RQD message.
The value of this counter includes the number of requests for a channel due to different services
except the PS service but excludes the number of CHAN REQ messages discarded during flow
control.
Unit
Integer number.
Measurement Point
This counter is incremented by one after flow control when the BSC receives the CHANNEL
REQUIRED message from the BTS. See measurement point A in Figure 1.
Figure 1 Immediate assignment procedure
Formula
Immediate Assignment Requests = [Channel Requests (Circuit Service)]
2.K3101:CELL_KPI_IMM_ASS_CMD (Immediate
Assignment Commands)
Description
In the immediate assignment procedure, the MS sends a CHAN REQ message to the BTS. After
receiving the message, the BTS sends a CHAN RQD message to the BSC. After the BSC

receives the CHAN RQD message, the BSC assigns an activated signaling channel to the MS. If
the BSC receives a CHAN ACT ACK message from the BTS, the signaling channel is ready for
assignment. Then, the BSC sends an IMM ASS CMD message, requesting the MS to access the
specified signaling channel. This signaling channel can be an SDCCH or a TCH. This counter
includes the number of channel requests except for the PS service.
Unit
Integer number.
Measurement Point
This counter is measured at C when the BSC sends an IMM ASS CMD message, as shown in
Figure 1.
Formula
Immediate Assignment Commands = [Immediate Assignment Commands (Circuit Service)]
3.K3000:CELL_KPI_SD_REQ (SDCCHSeizure
Requests)
Description
 In the immediate assignment procedure, the MS requests a channel from the BSS.
 In the incoming BSC handover procedure, the MSC requests the BSS to assign a channel
to the MS;
 In the internal BSC handover procedure, the BSC requests the BSS to re-assign a channel
to the MS. In the preceding procedures, this measurement provides the number of
requests for an SDCCH after the BSC receives the request.
Unit
Integer number.

Measurement Point
(1) In the immediate assignment procedure, this counter is incremented by one when the
BSC receives a CHANNEL REQUIRED message requesting for an SDCCH from the
BTS. This counter is measured at A, as shown in Figure 1.
(2) In the internal SDCCH handover procedure, this counter is incremented by one when the
target cell receives an Intercell Handover Request message from the originating cell. This
counter is measured at A, as shown in Figure 2.
Figure 2 Internal SDCCH handover procedure

(3) When the BSC receives a HANDOVER REQUEST message from another BSC, this
counter is incremented by one if the handover occurs on the SDCCH. The counter is
measured at A, as shown in Figure 3.
Figure 3 External SDCCH handover procedure
Formula
SDCCH Seizure Requests =
[Channel Assignment Requests in Immediate Assignment Procedure (SDCCH)] +
[Internal Intra-Cell Handover Requests (SDCCH)] +
[Incoming Internal Inter-Cell Handover Requests (SDCCH) (900/850-900/850)] +
[Incoming External Inter-Cell Handover Requests (SDCCH) (900/850-900/850)] +
[Incoming External Inter-Cell Handover Requests (SDCCH) (1800/1900-900/850)]
4.K3001: CELL_KPI_SD_CONGEST(Failed
SDCCHSeizures due to Busy SDCCH)
Description

This measurement provides the number of failed SDCCH seizures due to no idle SDCCH when
the MS or MSC requests an SDCCH from the BSS in an immediate assignment procedure or a
handover procedure.
Unit
Integer number.
Measurement Point
(1) In the immediate assignment procedure, when the MS requests an SDCCH but the cell
has no idle SDCCH available, this counter is incremented by one. See measurement point
A in Figure 1.
(2) In the internal handover procedure, if the handover occurs on the SDCCH, this counter is
incremented by one when the MS fails to seize (grasp) an SDCCH in the target cell
because of no idle SDCCH available. See measurement point A in Figure 2.

(3) In the external handover procedure, if the handover occurs on the SDCCH, this counter is
incremented by one when the MS fails to seize an SDCCH in the target cell because of no
idle SDCCH available. See measurement point A in Figure 3.

Formula
Failed SDCCH Seizures due to Busy SDCCH = [Channel Assignment Failures (All Channels
Busy or Channels Unconfigured) in Immediate Assignment Procedure (SDCCH)] + [Failed
Internal Intra-Cell Handovers (No Channel Available) (SDCCH) per BSC] + [Failed Incoming
Internal Intra-Cell Handovers (No Channel Available) (SDCCH) per BSC] + [Failed Incoming
External Intra-Cell Handovers (No Channel Available) (SDCCH) per BSC]
5.K3003:CELL_KPI_SD_SUCC(Successful
SDCCHSeizures)
Description
In an SDCCH immediate assignment procedure, the BTS sends a channel activation success
message to the BSC. After receiving this message, the BSC regards that the assignment of
SDCCH succeeds. In an SDCCH handover procedure, the BTS sends a handover detection
message to the target cell. After receiving this message, the BSC regards that the assignment of
SDCCH succeeds.
This counter applies to the previous two cases.
Unit
Integer number.
Measurement Point

In the immediate assignment of the SDCCH, when receiving the CHANNEL ACTIVATION
ACKNOWLEDGE message from the BTS, the BSC measures the counter. See measurement
point B in Figure 1.
Figure 1 Immediate Assignment Procedure
In the incoming BSC SDCCH handover procedure, when receiving the HANDOVER
DETECTION message from the BTS, the BSC measures the counter. The measurement object is
the target cell. See measurement point B in Figure 2.

In the incoming internal inter-cell handover procedure (including intra-cell handover), when
receiving the HANDOVER DETECTION message from the BTS, the BSC measures the
counter. The measurement object is the target cell. See measurement point B in Figure 3.
Formula
Successful SDCCH Seizures=
[Channel Activation Attempts in Immediate Assignment Procedure (SDCCH)]-
[CHAN ACTIV NACK Messages Sent by BTS in Immediate Assignment Procedure (SDCCH)]-
[Channel Activation Timeouts in Immediate Assignment Procedure (SDCCH)] +
[Internal Intra-Cell Handover Detection Messages Received by BSC (SDCCH)] +
[Incoming Internal Inter-Cell Handover Detection Messages Received by BSC (SDCCH)] +
[Incoming External Inter-Cell Handover Detection Messages Received by BSC (SDCCH)]
6.K3004:CELL_KPI_SD_TRAF_ERL(Traffic
Volume on SDCCH)
Description
This measurement provides the traffic intensity on the SDCCH. After activating the SDCCHs,
the BSC calculates the average number of busy SDCCHs at each sampling point in a granularity
period. The sampling period is 1s.
NOTE:

In normal cases, one-day traffic volume is the total of twenty-four 60-minute traffic volume and
is not 24-hour traffic volume measured on the M2000. According to the traffic measurement on
the M2000, 24-hour traffic volume is the same as 60-minute traffic volume in the case of uniform
traffic volume.
Unit
Erl
Measurement Point
For details, see Measurement Point in Traffic Volume on Signaling Channels (SDCCH).
Formula
Traffic Volume on SDCCH = [Traffic Volume on Signaling Channels (SDCCH)]
7.K3005:CELL_KPI_SD_AVAIL_NUM(Available
SDCCHs)
Description
This measurement provides the number of available SDCCHs in a cell in the BSC. The SDCCHs
include those that are converted from dynamic TCHs. The value of this counter is the average
number of available SDCCHs at each sampling point in the granularity period.
Unit
Integer number.
Measurement Point
The BSC collects the number of available SDCCHs each five seconds. At the end of the
granularity period, the value of this counter is the result of dividing the accumulative value of
each sampling point by the number of sampling times.
Formula
Available SDCCHs = [Mean Number of Available Channels (SDCCH)]
8.K3006:CELL_KPI_SD_CFG_NUM(Configured
SDCCHs)
Description
This measurement provides the number of SDCCHs configured in a cell in the BSC. The
SDCCHs include those that are converted from dynamic TCHs. The value of this counter is the
average number of SDCCHs at each sampling point in the granularity period.
Unit
Integer number.

Measurement Point
The BSC collects the number of configured SDCCHs per second. At the end of the granularity
period, the value of this counter is the result of dividing the accumulative value of each sampling
point by the number of sampling times.
Formula
Configured SDCCHs = [Mean Number of Dynamically Configured Channels (SDCCH)]
9.K3020:CELL_KPI_TCH_REQ_SIG(TCH
Seizure Requests (SignalingChannel))
Description
In the very early TCH assignment procedure, this measurement provides the number of CHAN
RQD messages that the BTS receives from the BTS.
Unit
Integer number.
Measurement Point
After receiving a CHAN RQD message from the BTS, the BSC assigns a channel at A, as shown
in the following figure. If the access cause is emergency call or call re-establishment, and the
BSC supports very early TCH assignment, the BSC assigns a TCH to carry signaling. If no
SDCCH is available and the SDCCH is not the only choice for location updating, the BSC
automatically assigns a TCH to carry signaling, and this counter is incremented by one.
Formula
TCH Seizure Requests (Signaling Channel) =
[Channel Assignment Requests in Immediate Assignment Procedure (TCH)]

10. K3021:CELL_KPI_TCH_CONG_SIG
(FailedTCH Seizures due to Busy TCH (Signaling
Channel))
Description
This measurement provides the number of times that the BSC has no TCH available in the very
early assignment of the TCH.
Unit
Integer number
Measurement Point
The BSC receives the ASSIGNMENT REQUEST message from the MSC and the resources
assigned by the message are used to establish the signaling connection. See measurement points
G1-G6 C in Figure 1.
 The BSC will assign a channel after receiving the ASSIGNMENT REQUEST message.
If no channel is available and the BSC does not support queuing or directed retry, the
BSC measures the counter.
 If Mode Modify is performed during the assignment procedure, the CHANNEL MODE
MODIFY message is sent to the MS. The MS performs Mode Modify and sends the
CHANNEL MODE MODIFY ACKNOWLEDGE message to the BSC. When receiving
this message, the BSC measures the counter if the Um interface channel mode IE is
abnormal.
 After the BSC receives the ASSIGNMENT REQUEST message, if no channel is
available and the BSC supports queuing, a timer is set to wait for an idle channel. If an
idle channel exists before the timer expires, the BSC successfully assigns the channel. If
no idle channels exist when the timer expires and directed retry is not supported, the BSC
measures the counter.
 If the directed retry fails, the BSC measures the counter and sends the MSC an
ASSIGNMENT FAILURE message to clear the connection when any of the following
situations occurs:
o The MRs reported by the MS have no target cell available.
o Directed retry to another cell in the BSC. The source cell receives the Intercell
Handover Reject message from the target cell. The measurement object is the
originating cell.
o Directed retry to another cell in the BSC. The handover fails and the MS
reconnects to the original signaling channel. The measurement object is the source
cell.
o Directed retry to another cell in the BSC. The target cell response is not received
within the scheduled time. The measurement object is the source cell.

o Directed retry to another cell in the BSC. The source cell receives the Inter Clear
Request message from the target cell. This clear message is used to inform the
source cell of the directed retry failure and to request the source cell to clear the
connection. The measurement object is the source cell.
o Directed retry to another cell in the BSC. The source cell sends the MS a
HANDOVER COMMAND message, requesting the MS to access a new channel.
If the source cell does not receive the Inter Clear Request from the target cell
within the scheduled time, the BSC measures the counter.
Figure 1 Assignment procedure
Formula
Failed TCH Seizures due to Busy TCH (Signaling Channel) = [TCH Channel Alloc Failed (No
Usable Channel) Times In Imm Assignment]

11. K3023:CELL_KPI_TCH_SUCC_SIG
(Successful TCH Seizures (SignalingChannel))
Description
In the very early TCH assignment procedure, this measurement provides the number of
successful attempts to activate the TCHs assigned by the BSC.
Unit
Integer number.
Measurement Point
In the very early TCH assignment procedure, this counter is incremented by one when the BSC
receives a CHANNEL ACTIVATION ACKNOWLEDGE message from the BTS. This counter
is measured at B, as shown in Figure 1.
Figure 1 Immediate Assignment Procedure
Formula
Successful TCH Seizures (Signaling Channel) =
([Channel Activation Attempts in Immediate Assignment Procedure (TCHF)] +
[Channel Activation Attempts in Immediate Assignment Procedure (TCHH)]) -
([CHAN ACTIV NACK Messages Sent by BTS in Immediate Assignment Procedure (TCHF)] +
[CHAN ACTIV NACK Messages Sent by BTS in Immediate Assignment Procedure (TCHH)] +
[Channel Activation Timeouts in Immediate Assignment Procedure (TCHF)] +
[Channel Activation Timeouts in Immediate Assignment Procedure (TCHH)])
12. K3022:CELL_KPI_TCH_DROPS_SIG(Call
Drops on TCH (SignalingChannel)
Description

In the very early TCH assignment procedure, this measurement provides the number of call
drops due to any cause on the established TCH carrying signaling.
Unit
Integer number.
Measurement Point
In the very early TCH assignment procedure, if the TCH is used to carry traffic, this counter is
calculated at A1, A2, A3, and A4, as shown in Figure 1.
Figure 1 Call drops in the immediate assignment (including very early assignment) procedure
A1: Call Drops Due to ERR IND Received in Stable State, Call Drops Due to the ERR IND
Received on the TRX in the Underlaid Subcell in Stable State, Call Drops Due to the ERR IND
Received on the TRX in the Overlaid Subcell in Stable State
A2: Call Drops Due to the CONN FAIL IND Received in Stable State, Call Drops Due to the
CONN FAIL IND Received on the TRX in the Underlaid Subcell in Stable State, Call Drops
Due to the CONN FAIL IND Received on the TRX in the Overlaid Subcell in Stable State
A3: Call Drops Due to REL IND Received in Stable State, Call Drops Due to the REL IND
Received on the TRX in the Underlaid Subcell in Stable State, Call Drops Due to the REL IND

Received on the TRX in the Overlaid Subcell in Stable State
A4: Call Drops Due to No MRs from MS for a Long Time, Call Drops Due to No MR from the
MS on the TRX in the Underlaid Subcell, Call Drops Due to No MR from the MS on the TRX in
the Overlaid Subcell, Call Drops due to Abis Terrestrial Link Failure, Call Drops Due to Abis
Terrestrial Link Failure on the TRX in the Underlaid Subcell, Call Drops Due to Abis Terrestrial
Link Failure on the TRX in the Overlaid Subcell, Call Drops Due to Equipment Failure, Call
Drops Due to TRX Failure in the Underlaid Subcell, Call Drops Due to TRX Failure in the
Overlaid Subcell, Call Drops due to Resource Check, Call Drops Due to Resource Check on the
TRX in the Underlaid Subcell, Call Drops Due to Resource Check on the TRX in the Overlaid
Subcell
A5: Clear Requests Sent on the A Interface
A6: Call Drops Due to Forced Handover, Call Drops Due to Forced Handover on the TRX in the
Underlaid Subcell, Call Drops Due to Forced Handover on the TRX in the Overlaid Subcell
A10: Successful SDCCH Seizures (Call Type)
Formula
Call Drops on TCH (Signaling Channel) = [Call Drops on Signaling Channel] - [Call Drops on
SDCCH]
13. K3024:CELL_KPI_TCH_TRAF_ERL_SIG
(TrafficVolume on TCH (SignalingChannel))
Description
The value of this counter is equal to the number of TCHs seized to carry signaling in the cell. In
the very early assignment of TCHs, after the TCH for carrying signaling is activated, the number
of TCHs is periodically collected. In a granularity period, the value of this counter is the result of
dividing the total number of busy TCHs by the number of sampling times.
Unit
Erl.
Measurement Point
At the end of each granularity period, the average number of busy TCHs for carrying signaling is
collected.
Formula
Traffic Volume on TCH (Signaling Channel) = [Traffic Volume of Signaling Channels (TCH)]

14. K3010A:CELL_KPI_TCH_ASS_REQ_TRAF
(TCH Seizure Requests (Traffic Channel))
Description
This measurement provides the number of TCH (traffic channel) seizure requests received by the
BSC from the MSC.
Unit
Integer number.
Measurement Point
In the assignment procedure, the BSC receives the ASSIGNMENT REQUEST message from the
MSC and measures this counter if the required channel is the TCH. See measurement point A in
Figure 1.
Formula
TCH Seizure Requests (Traffic Channel) =
[[Assignment Requests (Signaling Channel) TCH]+
[Assignment Requests (TCHF Only)]+
[Assignment Requests (TCHH Only)]+
[Assignment Requests (TCHF Preferred, Channel Type Unchangeable)]+
[Assignment Requests (TCHH Preferred, Channel Type Unchangeable)]+
[Assignment Requests (TCHF or TCHH, Channel Type Unchangeable)]+
[Assignment Requests (TCHF Preferred, Channel Type Changeable)]+
[Assignment Requests (TCHH Preferred, Channel Type Changeable)]+
[Assignment Requests (TCHF or TCHH, Channel Type Changeable)]]

15. K3011A:CELL_KPI_TCH_ASS_CONG_TR
AF (FailedTCH Seizures due to Busy TCH
(Traffic Channel))
Description
This counter provides the number of failed TCH (traffic channel) seizures because no TCH is
available.
Unit
Integer number
Measurement Point
See measurement points G1-G6 in Figure 1.
 The BSC will assign a channel after receiving the ASSIGNMENT REQUEST message.
If no channel is available and the BSC does not support queuing or directed retry, the
BSC measures the counter.
 If Mode Modify is performed during the assignment procedure, the CHANNEL MODE
MODIFY message is sent to the MS. The MS performs Mode Modify and sends the
CHANNEL MODE MODIFY ACKNOWLEDGE message to the BSC. When receiving
this message, the BSC measures the counter if the Um interface channel mode IE is
abnormal.
 After the BSC receives the ASSIGNMENT REQUEST message, if no channel is
available and the BSC supports queuing, a timer is set to wait for an idle channel. If an
idle channel exists before the timer expires, the BSC successfully assigns the channel. If
no idle channels exist when the timer expires and directed retry is not supported, the BSC
measures the counter.
 If the directed retry fails, the BSC measures the counter and sends the MSC an
ASSIGNMENT FAILURE message to clear the connection when any of the following
situations occurs:
o The MRs reported by the MS have no target cell available.
o Directed retry to another cell in the BSC. The source cell receives the Intercell
Handover Reject message from the target cell. The measurement object is the
source cell.
o Directed retry to another cell in the BSC. The handover fails and the MS
reconnects to the original signaling channel. The measurement object is the source
cell.
o Directed retry to another cell in the BSC. The target cell response is not received
within the scheduled time. The measurement object is the source cell.
o Directed retry to another cell in the BSC. The source cell receives the Inter Clear
Request message from the target cell. This clear message is used to inform the

source cell of the directed retry failure and to request the source cell to clear the
connection. The measurement object is the source cell.
o Directed retry to another cell in the BSC. The source cell sends the MS a
HANDOVER COMMAND message, requesting the MS to access a new channel.
If the source cell does not receive the Inter Clear Request from the target cell
within the scheduled time, the BSC measures the counter.
Formula
Failed TCH Seizures due to Busy TCH (Traffic Channel) = Failed Assignments (Channel
Unavailable)
16. K3013A:CELL_KPI_TCH_ASS_SUCC_TRA
F (Successful TCH Seizures (TrafficChannel))

Description
This measurement provides the number of successful TCH (traffic channel) seizures by the MS
in assignment procedure.
Unit
Integer number.
Measurement Point
If the assignment procedure is successful, the BSC sends the ASSIGNMENT COMPLETE
message to the MSC and measures the counter. See measurement point B in Figure 1.
Formula
Successful TCH Seizures (Traffic Channel) =
[TCH Seizure Requests (Traffic Channel)] -
([Failed Assignments during MOC on the A Interface (Including Directed Retry)] +
[Failed Assignments during MTC on the A Interface (Including Directed Retry)] +
[Failed Assignments during Emergency Call on the A Interface (Including Directed Retry)] +
[Failed Assignments during Call Re-establishment on the A Interface (Including Directed Retry)]
+
[Failed Mode Modify Attempts (MOC) (TCHF)] +
[Failed Mode Modify Attempts (MTC) (TCHF)] +
[Failed Mode Modify Attempts (Emergency Call) (TCHF)] +
[Failed Mode Modify Attempts (Call Re-establishment) (TCHF)] +
[Failed Mode Modify Attempts (MOC) (TCHH)] +
[Failed Mode Modify Attempts (MTC) (TCHH)] +
[Failed Mode Modify Attempts (Call Re-establishment) (TCHH)])

17. K3012A:CELL_KPI_TCH_STATIC_DROPS
_TRAF (Call Drops on TCH in Stable State
(Traffic Channel))
Description
This measurement provides the number of call drops occurred after the MS is in the stable
communication state on the TCH carrying traffic.
Unit
Integer number.
Measurement Point
This counter is calculated by using the following formula.
Formula
Call Drops on TCH in Stable State (Traffic Channel) =
[Call Drops on Radio Interface in Stable State (Traffic Channel)]+
[Call Drops due to No MRs from MS for a Long Time (Traffic Channel)]+
[Call Drops due to Abis Terrestrial Link Failure (Traffic Channel)]+
[Call Drops due to Equipment Failure (Traffic Channel)]+
[Call Drops due to Forced Handover (Traffic Channel)]+
[Call Drops Due to Loopback Start Failure]+
[Call Drops Due to Failures to Return to Normal Call from Loopback]
18. K3010B:CELL_KPI_TCH_HO_REQ_TRAF
(TCH Seizure Requests in TCH Handovers
(Traffic Channel))
Description
In an intra-BSC incoming handover procedure, the MS requests the BSS to reallocate a TCH
(traffic channel). In an inter-BSC incoming handover procedure, the MSC requests the BSS to
reallocate a TCH (traffic channel).
This measurement provides the total number of TCH seizure requests in the procedures
mentioned previously.
Unit
Integer number.
Measurement Point
(1) Incoming internal inter-cell handover procedure: According to the measurement report
received from the MS, the BSC decides to initiate the incoming internal inter-cell handover.

When receiving the incoming internal inter-cell handover request, the BSC measures the counter.
The measurement object is the target cell. See measurement point D in Figure 1and Figure 2.
Figure 1 Internal inter-cell handover procedure (excluding directed retry)

Figure 2 Internal inter-cell handover procedure (directed retry)
(2) In the incoming external inter-cell handover procedure, when receiving the HO REQ message
from the MSC, BSC2 measures this counter. The measurement object is the target cell. See
measurement point D in Figure 3and Figure 4.

Figure 3 External handover procedure (excluding directed retry)

Figure 4 External handover procedure (directed retry)
Formula
TCH Seizure Requests in TCH Handovers (Traffic Channel) =
[Internal Intra-Cell Handover Requests (TCH)] +
[Incoming Internal Inter-Cell Handover Requests (TCH) (900/850-900/850)] +
[Incoming External Inter-Cell Handover Requests (TCH) (900/850-900/850)] +

[Incoming External Inter-Cell Handover Requests (TCH) (1800/1900-900/850)]
19. K3011B:CELL_KPI_TCH_HO_CONGEST_
TRAF (FailedTCH Seizures in TCH Handovers
due to Busy TCH (Traffic Channel))
Description
This counter provides the number of failed TCH (traffic channel) seizures due to no TCH
available in TCH handovers.
Unit
Integer number
Measurement Point
 According to the measurement report received from the MS, the BSC decides to initiate
the incoming internal inter-cell handover. If the channel request fails because of no
channel available, the BSC measures the counter. The measurement object is the target
cell. See measurement point C in Figure 1 and Figure 2.

Figure 2 Internal inter-cell handover procedure (including directed retry)
 BSC2 receives the HO REQ message from the MSC and decodes it. If the decoding is
successful, BSC2 requests a channel from the target cell. If the request fails because no
channel is available, the measurement is triggered according to the channle type. See
measurement point C in Figure 3 and Figure 4.

Figure 4 External handover procedure (including directed retry)
Formula
Failed TCH Seizures in TCH Handovers due to Busy TCH (Traffic Channel) =
[Failed Internal Intra-Cell Handovers (Channel Unavailable) (TCH)+
[Failed Incoming Internal Inter-Cell Handovers (No Channel Available) (TCH)+
[Failed Incoming External Inter-Cell Handovers (No Channel Available) (TCH)

20. K3013B:CELL_KPI_TCH_HO_SUCC_TRA
F (Successful TCH Seizures in TCH Handovers
(Traffic Channel))
Description
This measurement provides the number of successful TCH (traffic channel) seizures by the MS
during TCH handovers.
Unit
Integer number.
Measurement Point
Internal intra-cell handover The measurement is triggered when the BSC receives the HO
DETECT message from the target BTS (see measurement point E in Figure 1and Figure 2). The
measurement is based on the channel type.
Figure 1 External handover procedure (excluding directed retry)

Figure 2 External handover procedure (directed retry)
Incoming external inter-cell handover The measurement is triggered when BSC2 receives the
HO DETECT message from the target BTS (see measurement point E in Figure 3and Figure 4.
The measurement is based on the channel type.

Figure 4 Internal inter-cell handover procedure (directed retry)
Formula
Successful TCH Seizures in TCH Handovers (Traffic Channel) =
[Internal Intra-Cell Handover Detection Messages Received by BSC (TCHF)] +
[Internal Intra-Cell Handover Detection Messages Received by BSC (TCHH)] +
[Incoming Internal Inter-Cell Handover Detection Messages Received by BSC (TCHF)] +
[Incoming Internal Inter-Cell Handover Detection Messages Received by BSC (TCHH)] +
[Incoming External Inter-Cell Handover Detection Messages Received by BSC (TCHF)] +
[Incoming External Inter-Cell Handover Detection Messages Received by BSC (TCHH)]

21. K3012B:CELL_KPI_TCH_HO_DROPS_TR
AF (Call Drops in TCH Handovers (Traffic
Channel))
Description
This measurement provides the number of call drops due to the Um interface failure during the
handovers on the TCH carrying traffic.
Unit
Integer number.
Measurement Point
Refer to Call Drops on Radio Interface in Handover State (TCH).
Formula
Call Drops in TCH Handovers (Traffic Channel) =[Call Drops on Radio Interface in Handover
State (Traffic Channel)]
22. K3014:
CELL_KPI_TCH_TRAF_ERL_TRAF (Traffic
Volume on TCH)
Description
This measurement provides the traffic intensity on the TCH. After activating the TCHs, the BSC
calculates the average number of busy TCHs at each sampling point in a granularity period. The
sampling period is 5s.
NOTE:
In normal cases, one-day traffic volume is the total of twenty-four 60-minute traffic volume and
is not 24-hour traffic volume measured on the M2000.
According to the traffic measurement on the M2000, 24-hour traffic volume is the same as 60-
minute traffic volume in the case of average traffic volume.
Unit
Erl
Measurement Point
For details, see Measurement Point in Traffic Volume of TCHs.
Formula
Traffic Volume on TCH = [Traffic Volume of TCHs]

23. K3015:CELL_KPI_TCH_AVAIL_NUM
(AvailableTCHs)
Description
This measurement provides the number of available TCHs in a cell in the BSC, that is, the BSC
calculates the average number of idle TCHs or busy TCHs at each sampling point in a
granularity period. The sampling period is 5s.
The TCHs include the TCHs that are converted from dynamic PDCHs but exclude the TCHs that
are dynamically converted to SDCCHs.
Unit
Integer number.
Measurement Point
For details, see Measurement Point in Mean Number of Available Channels (TCH).
Formula
Available TCHs = [Mean Number of Available Channels (TCH)]
24. K3016:CELL_KPI_TCH_CFG_NUM
(ConfiguredTCHs)
Description
This measurement provides the number of TCHs configured in a cell in the BSC, that is, the BSC
calculates the average number of TCHs configured in a cell at each sampling point in a
granularity period. The sampling period is 5s.
The TCHs include the TCHs that are converted from dynamic PDCHs but exclude the TCHs that
are dynamically converted to SDCCHs.
Unit
Integer number.
Measurement Point
For details, see Measurement Point in Mean Number of Dynamically Configured Channels
(TCH).
Formula
Configured TCHs = [Mean Number of Dynamically Configured Channels (TCH)]

25. K3170:CELL_KPI_DUBAND_HO_REQ
(Dual-BandHandoverRequests)
Description
This measurement provides the total number of requests for the handovers between cells over
different frequency bands, including the incoming internal inter-cell handovers, outgoing internal
inter-cell handovers, incoming external inter-cell handovers, and the outgoing external inter-cell
handovers.
Unit
Integer number.
Measurement Point
Refer to the following counters.
Formula
Dual-Band Handover Requests =
[Outgoing External Inter-Cell Handover Requests (SDCCH) (Excluding Directed Retry)
(900/850-1800/1900)] +
[Outgoing External Inter-Cell Handover Requests (TCHF) (Excluding Directed Retry) (900/850-
1800/1900)] +
[Outgoing External Inter-Cell Handover Requests (TCHH) (Excluding Directed Retry) (900/850-
1800/1900)] +
[Outgoing External Inter-Cell Handover Requests (Directed Retry) (900/850-1800/1900)] +
[Outgoing External Inter-Cell Handover Requests (SDCCH) (Excluding Directed Retry)
(1800/1900-900/850)] +
[Outgoing External Inter-Cell Handover Requests (TCHF) (Excluding Directed Retry)
(1800/1900-900/850)] +
[Outgoing External Inter-Cell Handover Requests (TCHH) (Excluding Directed Retry)
(1800/1900-900/850)] +
[Outgoing External Inter-Cell Handover Requests (Directed Retry) (1800/1900-900/850)]
26. K3173:CELL_KPI_DUBAND_HO_SUCC(Su
ccessful Dual-BandHandovers)
Description

This measurement provides the total number of successful handovers between cells over
different frequency bands, including the incoming internal inter-cell handovers, outgoing internal
inter-cell handovers, incoming external inter-cell handovers, and the outgoing external inter-cell
handovers. This counter is used to evaluate the performance of the dual-band handover.
Unit
Integer number.
Measurement Point
Refer to the following counters.
Formula
Successful Dual-Band Handovers =
[Dual-Band Handover Requests]-[Failed Dual-Band Handovers]
27. K3041:CELL_TCH_OVERFLOW_RATE
(TCH CongestionRate (Overflow))
Description
This measurement provides the ratio of failed assignments due to no idle TCHs to TCH seizure
requests. In the immediate assignment procedure, assignment procedure, or handover procedure,
this counter is measured when the BSS successfully assigns TCHs upon the MS requests or MSC
requests.
Unit
%.
Measurement Point
At the end of the granularity period, this counter is calculated by using the following formula.
Formula
TCH Congestion Rate(Overflow)=
([Failed TCH Seizures due to Busy TCH (Signaling Channel)]+
[Failed TCH Seizures due to Busy TCH (Traffic Channel)]+
[Failed TCH Seizures in TCH Handovers due to Busy TCH (Traffic Channel)])*{100}
/
([TCH Seizure Requests (Signaling Channel)]+
[TCH Seizure Requests (Traffic Channel)]+
[TCH Seizure Requests in TCH Handovers (Traffic Channel)])
28. K3043:CELL_TCH_SEIZ_SUCC_RATE
(TCH Seizure Success Rate)

Description
This measurement provides the ratio of successful TCH seizures to TCH seizure requests. In the
immediate assignment procedure, assignment procedure, or handover procedure, this counter is
measured when the BSS successfully assigns TCHs upon the MS requests or MSC requests.
Unit
%.
Measurement Point
Formula
TCH Seizure Success Rate =
([Successful TCH Seizures (Signaling Channel)]+
[Successful TCH Seizures (Traffic Channel)]+
[Successful TCH Seizures in TCH handovers (Traffic Channel)])*{100}
/
29. K3034:CELL_KPI_TCHH_TRAF_ERL
(TCHH TrafficVolume)
Description
This measurement provides the traffic volume on the TCHHs in all the cells under the control of
the BSC, excluding the traffic on the TCHHs in the very early assignment.
Unit
Erl.
Measurement Point
Formula
TCHH Traffic Volume = [Mean Number of Busy TCHs (TCHH) (900/850 Cell)] + [Mean
Number of Busy TCHs (TCHH) (1800/1900 Cell)]
30. RK3255:CELL_TRX_CFG_AVAIL_RATE
(TRX Usability)
Description
This measurement provides the ratio of available TRXs in a cell to TRXs configured in the cell.

Unit
%.
Measurement Point
Formula
TRX Usability = [Available TRXs in cell] x {100}/[Activated TRXs in cell]
31. K3040:CELL_KPI_TCH_SUCC(Successful
TCH Seizures)
Description
In the very early assignment, assignment, directed retry, or handover procedure, this
measurement provides the number of times that the MS successfully seizes the TCHs assigned
by the BSS.
Unit
Integer number.
Measurement Point
Formula
Successful TCH Seizures =
[Successful TCH Seizures (Signaling Channel)] +
[Successful TCH Seizures (Traffic Channel)] +
[Successful TCH Seizures in TCH handovers (Traffic Channel)]
32. K3045:CELL_KPI_TCH_CONGESTION_R
ATE (CongestionRatio on TCH (All Channels
Busy))
Description
This counter provides the ratio of failed requests for idle TCHs to total requests for TCHs.
Unit
%
Measurement Point
None.

Formula
Congestion Ratio on TCH (All Channels Busy) =
([Failed TCH Seizures due to Busy TCH (Signaling Channel)]+
[Failed TCH Seizures due to Busy TCH (Traffic Channel)]+
[Failed TCH Seizures in TCH Handovers due to Busy TCH (Traffic Channel)])x{100}/
33. K3173F:CELL_KPI_DUBAND_HO_FAI
(FailedDual-BandHandovers)
Description
This measurement provides the total number of failed handovers between cells over different
frequency bands, including the failed incoming internal inter-cell handovers, failed outgoing
internal inter-cell handovers, failed incoming external inter-cell handovers, and failed outgoing
external inter-cell handovers.
Unit
Integer number.
Measurement Point
This counter is measured according to the following formula.
Formula
Failed Dual-Band Handovers = [Failed Incoming Internal Inter-Cell Handovers (SDCCH)
(900/850-1800/1900)] +
[Failed Incoming Internal Inter-Cell Handovers (TCH) (900/850/-1800/1900)] +
[Failed Incoming External Inter-Cell Handovers (SDCCH) (900/850-1800/1900)] +
[Failed Incoming External Inter-Cell Handovers (TCH) (900/850-1800/1900)] +
[Failed Outgoing External Inter-Cell Handovers (SDCCH) (Excluding Directed Retry) (900/850-
1800/1900)] +
[Failed Outgoing External Inter-Cell Handovers (TCHF) (Excluding Directed Retry) (900/850-
1800/1900)] +
[Failed Outgoing External Inter-Cell Handovers (TCHH) (Excluding Directed Retry) (900/850-
1800/1900)] +
[Failed Outgoing External Inter-Cell Handovers (Directed Retry) (900/850-1800/1900)] +
[Failed Incoming Internal Inter-Cell Handovers (SDCCH) (1800/1900-900/850)] +
[Failed Incoming Internal Inter-Cell Handovers (TCH) (1800/1900-900/850)] +
[Failed Incoming External Inter-Cell Handovers (SDCCH) (1800/1900-900/850)] +

[Failed Incoming External Inter-Cell Handovers (TCH) (1800/1900-900/850)] +
[Failed Outgoing External Inter-Cell Handovers (SDCCH) (Excluding Directed Retry)
(1800/1900-900/850)] +
[Failed Outgoing External Inter-Cell Handovers (TCHF) (Excluding Directed Retry)
(1800/1900-900/850)] +
[Failed Outgoing External Inter-Cell Handovers (TCHH) (Excluding Directed Retry)
(1800/1900-900/850)] +
[Failed Outgoing External Inter-Cell Handovers (Directed Retry) (1800/1900-900/850)]
34. RM3276:CELL_KPI_TCH_SUCC_SIG_TCH
H (Successful TCH Seizures (SignalingChannel)
(TCHH))
Description
This measurement provides the number of successful attempts of activating TCHHs assigned by
the BSC in the very early TCH assignment procedure.
Unit
Integer number.
Measurement Point
Formula
Successful TCH Seizures (Signaling Channel) (TCHH) = [Channel Activation Attempts in
Immediate Assignment Procedure (TCHH)] - ([CHAN ACTIV NACK Messages Sent by BTS in
Immediate Assignment Procedure (TCHH)] + [Channel Activation Timeouts in Immediate
Assignment Procedure (TCHH)])
35. RM3176:CELL_KPI_TCH_SUCC_SIG_TCH
F (Successful TCH Seizures (SignalingChannel)
(TCHF))
Description
This measurement provides the number of successful attempts to activate the TCHFs assigned by
the BSC in the very early TCH assignment procedure.
Unit
Integer number.

Measurement Point
Formula
Successful TCH Seizures (Signaling Channel) (TCHF) = [Channel Activation Attempts in
Immediate Assignment Procedure (TCHF)] - ([CHAN ACTIV NACK Messages Sent by BTS in
Immediate Assignment Procedure (TCHF)] + [Channel Activation Timeouts in Immediate
Assignment Procedure (TCHF)])
36. RM3278:CELL_KPI_TCH_ASS_SUCC_TR
AF_TCHH(Successful TCH Seizures (Traffic
Channel)(TCHH))
Description
This measurement provides the number of times that the MS successfully seizes the TCHHs
assigned by the BSC in the assignment procedure.
Unit
Integer number.
Measurement Point
Formula
Successful TCH Seizures (Traffic Channel) (TCHH) =
[Completed Assignments (First Assignment of a TCHH)] +
[Completed Assignments (Reassignment of a TCHH)]
37. RM3178:CELL_KPI_TCH_ASS_SUCC_TR
AF_TCHF(Successful TCHSeizures (Traffic
Channel)(TCHF))
Description
This measurement provides the number of times that the MS successfully seizes the assigned
traffic channels (TCHF) in the assignment procedure.
Unit
Integer number.
Measurement Point

Formula
Successful TCH Seizures (Traffic Channel) (TCHF) =
[Completed Assignments (First Assignment of a TCHF)] +
[Completed Assignments (Reassignment of a TCHF)]
38. RM3279:CELL_KPI_TCH_HO_SUCC_TRA
F_TCHH(Successful TCH Seizures in TCH
Handovers (TrafficChannel)(TCHH))
Description
This measurement provides the number of times that the MS successfully seizes the TCHHs
assigned by the BSC during the TCH handover.
Unit
Integer number.
Measurement Point
Formula
Successful TCH Seizures in TCH Handovers (Traffic Channel) (TCHH) =
[Internal Intra-Cell Handover Detection Messages Received by BSC (TCHH)] +
[Incoming Internal Inter-Cell Handover Detection Messages Received by BSC (TCHH)] +
[Incoming External Inter-Cell Handover Detection Messages Received by BSC (TCHH)]
39. RM3179:CELL_KPI_TCH_HO_SUCC_TRA
F_TCHF(SuccessfulTCH Seizures in TCH
Handovers (TrafficChannel)(TCHF))
Description
This measurement provides the number of times that the MS successfully seizes the traffic
channel (TCHF) assigned by the BSC during the TCH handover.
Unit
Integer number.
Measurement Point
The value of this counter is calculated according to the following formula.

Formula
Successful TCH Seizures in TCH Handovers (Traffic Channel) (TCHF) =
[Internal Intra-Cell Handover Detection Messages Received by BSC (TCHF)] +
[Incoming Internal Inter-Cell Handover Detection Messages Received by BSC (TCHF)] +
[Incoming External Inter-Cell Handover Detection Messages Received by BSC (TCHF)]

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