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Appendix for KPI Formula Security level
2008-06-12 HUAWEI Confidential Page 1/24
Appendix for KPI Formula
Content
1. Call setup time e2e(voice) ..................................................................... 2
2. Handover Success Rate, Intra BSC.......................................................... 3
3. Handover Success Rate, Inter BSC/MSC .................................................. 7
4. Minutes Per Drop, MPD........................................................................ 10
5. TCH Congestion ................................................................................. 11
6. SDCCH Congestion (including reattempt)............................................... 14
7. Paging Success Rate % ....................................................................... 16
8. Random Access Success Rate %........................................................... 16
9. PDCH Allocation Success Rate (%)........................................................ 18
10. TBF Establishment Success Rate (%) .................................................... 19
11. PDP Context Activation Success Rate (%) .............................................. 20
12. SDCCH drop due to quality .................................................................. 22
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1. Call setup time e2e(voice)
Definition: Time period from the BSC receiving a CHANNEL REQUEST message from MS
to ALERTING message sent back to MS.
Formula: To be derived from drivetest.
Figure 1. Call Set Up Procedure:
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2. Handover Success Rate, Intra BSC
Definition: Handover Success Rate of different cells within the same BSC.
Formula: Successful Internal inter-cell Handovers/Outgoing Internal inter-cell
Handover Commands.
Figure 2: Internal inter-cell handover procedure (including directed retry):
Attempt at Measurement Point B.
Existing Formula:
Handover Success Rate (%), Intra BSC
=NCELLREL.HOVERSUC*100/NCELLREL.HOVERCNT
HOVERSUC: Number of successful handover to the neighbor cell.
HOVERCNT: Number of Handover Commands sent to the MS.
NCELLREL means internal BSC.
Huawei Formula:
Handover Success Rate (%), Intra BSC
=100 * Successful Outgoing Internal Inter-Cell Handovers/ Outgoing Internal Inter-Cell
Handover Commands per Cell
= 100* CH313/ CH311
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Successful Outgoing Internal Inter-Cell Handovers:
CH313:CELL_INTRABSC_OUTCELL_HO_SUCC
This measurement provides the number of successful outgoing internal inter-cell
handovers per cell. This measurement is triggered when BSC receives an HO CMP
message before the timer that is set to wait for the HO CMP message expires. Counter
measures successful direct retry as well.
Detail Formula:
Successful Outgoing Internal Inter-Cell Handovers per Cell = [Outgoing Internal
Inter-Cell Handover Requests] - [Failed Outgoing Internal Inter-Cell Handovers]
= [Outgoing Internal Inter-Cell Handover Requests per Cell (SDCCH) (Excluding Directed
Retry) (900/850-900/850)] +
[Outgoing Internal Inter-Cell Handover Requests per Cell (SDCCH) (Excluding Directed
Retry) (GSM1800/1900-GSM1800/1900)] +
[Outgoing Internal Inter-Cell Handover Requests per Cell (SDCCH) (Excluding Directed
Retry) (900/850-GSM1800/1900)] +
[Outgoing Internal Inter-Cell Handover Requests per Cell (SDCCH) (Excluding Directed
Retry) (GSM1800/1900-900/850)] +
[Outgoing Internal Inter-Cell Handover Requests per Cell (TCHF) (Excluding Directed
Retry) (900/850-900/850)] +
[Outgoing Internal Inter-Cell Handover Requests per Cell (TCHF) (Excluding Directed
Retry) (GSM1800/1900-GSM1800/1900)] +
[Outgoing Internal Inter-Cell Handover Requests per Cell (TCHF) (Excluding Directed
Retry) (900/850-GSM1800/1900)] +
[Outgoing Internal Inter-Cell Handover Requests per Cell (TCHF) (Excluding Directed
Retry) (GSM1800/1900-900/850)] +
[Outgoing Internal Inter-Cell Handover Requests per Cell (TCHH) (Excluding Directed
Retry) (900/850-900/850)] +
[Outgoing Internal Inter-Cell Handover Requests per Cell (TCHH) (Excluding Directed
Retry) (GSM1800/1900-GSM1800/1900)] +
[Outgoing Internal Inter-Cell Handover Requests per Cell (TCHH) (Excluding Directed
Retry) (900/850-GSM1800/1900)] +
[Outgoing Internal Inter-Cell Handover Requests per Cell (TCHH) (Excluding Directed
Retry) (GSM1800/1900-900/850)] +
[Outgoing Internal Inter-Cell Handover Requests per Cell (Including Directed Retry)
(900/850-900/850)] +
[Outgoing Internal Inter-Cell Handover Requests per Cell (Including Directed Retry)
(GSM1800/1900-GSM1800/1900)] +
[Outgoing Internal Inter-Cell Handover Requests per Cell (Including Directed Retry)
(900/850-GSM1800/1900)] +
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[Outgoing Internal Inter-Cell Handover Requests per Cell (Including Directed Retry)
(GSM1800/1900-900/850)]
- [Failed Outgoing Internal Inter-Cell Handovers per Cell (SDCCH) (Excluding Directed
Retry) (900/850-900/850)] +
[Failed Outgoing Internal Inter-Cell Handovers per Cell (SDCCH) (Excluding Directed
Retry) (GSM1800/1900-GSM1800/1900)] +
[Failed Outgoing Internal Inter-Cell Handovers per Cell (SDCCH) (Excluding Directed
Retry) (900/850-GSM1800/1900)] +
[Failed Outgoing Internal Inter-Cell Handovers per Cell (SDCCH) (Excluding Directed
Retry) (GSM1800/1900-900/850)] +
[Failed Outgoing Internal Inter-Cell Handovers per Cell (TCHF) (Excluding Directed Retry)
(900/850-900/850)] +
[Failed Outgoing Internal Inter-Cell Handovers per Cell (TCHF) (Excluding Directed Retry)
(GSM1800/1900-GSM1800/1900)] +
[Failed Outgoing Internal Inter-Cell Handovers per Cell (TCHF) (Excluding Directed Retry)
(900/850-GSM1800/1900)] +
[Failed Outgoing Internal Inter-Cell Handovers per Cell (TCHF) (Excluding Directed Retry)
(GSM1800/1900-900/850)] +
[Failed Outgoing Internal Inter-Cell Handovers per Cell (TCHH) (Excluding Directed Retry)
(900/850-900/850)] +
[Failed Outgoing Internal Inter-Cell Handovers per Cell (TCHH) (Excluding Directed Retry)
(GSM1800/1900-GSM1800/1900)] +
[Failed Outgoing Internal Inter-Cell Handovers per Cell (TCHH) (Excluding Directed Retry)
(900/850-GSM1800/1900)] +
[Failed Outgoing Internal Inter-Cell Handovers per Cell (TCHH) (Excluding Directed Retry)
(GSM1800/1900-900/850)] +
[Failed Outgoing Internal Inter-Cell Handovers per Cell (Including Directed Retry)
(900/850-900/850)] +
[Failed Outgoing Internal Inter-Cell Handovers per Cell (Including Directed Retry)
(GSM1800/1900-GSM1800/1900)] +
[Failed Outgoing Internal Inter-Cell Handovers per Cell (Including Directed Retry)
(900/850-GSM1800/1900)] +
[Failed Outgoing Internal Inter-Cell Handovers per Cell (Including Directed Retry)
(GSM1800/1900-900/850)]
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Outgoing Internal Inter-Cell Handover Commands per Cell
CH311:CELL_INTRABSC_OUTCELL_HO_CMD
The BSC measures the related counter when sending an HO CMD message to the MS
through the originating cell.
Detail Formula:
= [Outgoing Internal Inter-Cell Handover Commands per Cell (SDCCH) (Excluding
Directed Retry) (900/850-900/850)] +
[Outgoing Internal Inter-Cell Handover Commands per Cell (SDCCH) (Excluding Directed
Retry) (GSM1800/1900-GSM1800/1900)] +
[Outgoing Internal Inter-Cell Handover Commands per Cell (SDCCH) (Excluding Directed Retry) (900/850-GSM1800/1900)] +
[Outgoing Internal Inter-Cell Handover Commands per Cell (SDCCH) (Excluding Directed Retry) (GSM1800/1900-900/850)] +
[Outgoing Internal Inter-Cell Handover Commands per Cell (TCHF) (Excluding Directed Retry) (900/850-900/850)] +
[Outgoing Internal Inter-Cell Handover Commands per Cell (TCHF) (Excluding Directed
Retry) (GSM1800/1900-GSM1800/1900)] +
[Outgoing Internal Inter-Cell Handover Commands per Cell (TCHF) (Excluding Directed Retry) (900/850-GSM1800/1900)] +
[Outgoing Internal Inter-Cell Handover Commands per Cell (TCHF) (Excluding Directed Retry) (GSM1800/1900-900/850)] +
[Outgoing Internal Inter-Cell Handover Commands per Cell (TCHH) (Excluding Directed Retry) (900/850-900/850)] +
[Outgoing Internal Inter-Cell Handover Commands per Cell (TCHH) (Excluding Directed Retry) (GSM1800/1900-GSM1800/1900)] +
[Outgoing Internal Inter-Cell Handover Commands per Cell (TCHH) (Excluding Directed
Retry) (900/850-GSM1800/1900)] +
[Outgoing Internal Inter-Cell Handover Commands per Cell (TCHH) (Excluding Directed Retry) (GSM1800/1900-900/850)] +
[Outgoing Internal Inter-Cell Handover Commands per Cell (Including Directed Retry) (900/850-900/850)] +
[Outgoing Internal Inter-Cell Handover Commands per Cell (Including Directed Retry) (GSM1800/1900-GSM1800/1900)] +
[Outgoing Internal Inter-Cell Handover Commands per Cell (Including Directed Retry) (900/850-GSM1800/1900)] +
[Outgoing Internal Inter-Cell Handover Commands per Cell (Including Directed Retry)
(GSM1800/1900-900/850)]
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3. Handover Success Rate, Inter BSC/MSC
Definition: Handover Success Rate, Inter BSC/MSC (outgoing)
Formula: Successful Outgoing External Inter-Cell Handovers/Outgoing External
Inter-Cell Handover Commands
Figure 3: External handover procedure
Start Measurement at Point B.
Existing Formula
Handover Success Rate (%), Inter BSC
=NECELLREL.HOVERSUC*100/NECELLREL.HOVERCNT
HOVERSUC: Number of successful handover to the neighbouring cell.
HOVERCNT: Number of Handover Commands sent to the MS.
NECELLREL means external BSC.
Huawei Formula
Handover Success Rate (%), Inter BSC
=100 * Successful Outgoing External Inter-Cell Handovers
/ Outgoing External Inter-Cell Handover Commands
=100* CH333/ CH331
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Successful Outgoing External Inter-Cell Handovers
CH333:CELL_INTERBSC_OUTCELL_HO_SUCC
In the outgoing external inter-cell handover procedure, this measurement is triggered
when the handover is successful.
Detail Formula:
Successful Outgoing External Inter-Cell Handovers =
[Outgoing External Inter-Cell Handover Requests]- [Failed Outgoing External
Inter-Cell Handovers]
= {H3300W:CELL_INTERBSC_OUTCELL_HO_REQ_SD_NOT_INCLUDE_DR_900_900
+H3300X:CELL_INTERBSC_OUTCELL_HO_REQ_SD_NOT_INCLUDE_DR_1800_1800
+H3300Y:CELL_INTERBSC_OUTCELL_HO_REQ_SD_NOT_INCLUDE_DR_900_1800
+H3300Z:CELL_INTERBSC_OUTCELL_HO_REQ_SD_NOT_INCLUDE_DR_1800_900
+H3307W:CELL_INTERBSC_OUTCELL_HO_REQ_TCHF_NOT_INCLUDEDR_900_900
+H3307X:CELL_INTERBSC_OUTCELL_HO_REQ_TCHF_NOT_INCLUDEDR_1800_1800
+H3307Y:CELL_INTERBSC_OUTCELL_HO_REQ_TCHF_NOT_INCLUDEDR_900_1800
+H3307Z:CELL_INTERBSC_OUTCELL_HO_REQ_TCHF_NOT_INCLUDEDR_1800_900
+H3308W:CELL_INTERBSC_OUTCELL_HO_REQ_TCHH_NOT_INCLUDEDR_900_900
+H3308X:CELL_INTERBSC_OUTCELL_HO_REQ_TCHH_NOT_INCLUDEDR_1800_1800
+H3308Y:CELL_INTERBSC_OUTCELL_HO_REQ_TCHH_NOT_INCLUDEDR_900_1800
+H3308Z:CELL_INTERBSC_OUTCELL_HO_REQ_TCHH_NOT_INCLUDEDR_1800_900}
-
{H3320W:CELL_INTERBSC_OUTCELL_HO_FAIL_SD_NOT_INCLUDE_DR_900_900
+H3320X:CELL_INTERBSC_OUTCELL_HO_FAIL_SD_NOT_INCLUDE_DR_1800_1800
+H3320Y:CELL_INTERBSC_OUTCELL_HO_FAIL_SD_NOT_INCLUDE_DR_900_1800
+H3320Z:CELL_INTERBSC_OUTCELL_HO_FAIL_SD_NOT_INCLUDE_DR_1800_900
+H3327W:CELL_INTERBSC_OUTCELL_HO_FAIL_TCHF_NOT_INCLUDE_DR_900_900
+H3327X:CELL_INTERBSC_OUTCELL_HO_FAIL_TCHF_NOT_INCLUDE_DR_1800_1800
+H3327Y:CELL_INTERBSC_OUTCELL_HO_FAIL_TCHF_NOT_INCLUDE_DR_900_1800
+H3327Z:CELL_INTERBSC_OUTCELL_HO_FAIL_TCHF_NOT_INCLUDE_DR_1800_900
+H3328W:CELL_INTERBSC_OUTCELL_HO_FAIL_TCHH_NOT_INCLUDE_DR_900_900
+H3328X:CELL_INTERBSC_OUTCELL_HO_FAIL_TCHH_NOT_INCLUDE_DR_1800_1800
+H3328Y:CELL_INTERBSC_OUTCELL_HO_FAIL_TCHH_NOT_INCLUDE_DR_900_1800
+H3328Z:CELL_INTERBSC_OUTCELL_HO_FAIL_TCHH_NOT_INCLUDE_DR_1800_900}
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Outgoing External Inter-Cell Handover Commands
CH331:CELL_INTERBSC_OUTCELL_HO_CMD
This measurement provides the number of outgoing external inter-cell handover
commands sent by the originating BSC to the MSs. The measurement is performed in
the originating cell.
Detail Formula:
= [Outgoing External Inter-Cell Handover Commands (SDCCH) (Excluding Directed Retry)
(900/850-900/850)]
+[Outgoing External Inter-Cell Handover Commands (SDCCH) (Excluding Directed Retry) (1800/1900-1800/1900)]
+[Outgoing External Inter-Cell Handover Commands (SDCCH) (Excluding Directed Retry) (900/850-1800/1900)]
+[Outgoing External Inter-Cell Handover Commands (SDCCH) (Excluding Directed Retry) (1800/1900-900/850)]
+[Outgoing External Inter-Cell Handover Commands (TCHF) (Excluding Directed Retry) (900/850-900/850)]
+[Outgoing External Inter-Cell Handover Commands (TCHF) (Excluding Directed Retry)
(1800/1900-1800/1900)]
+[Outgoing External Inter-Cell Handover Commands (TCHF) (Excluding Directed Retry) (900/850-1800/1900)]
+[Outgoing External Inter-Cell Handover Commands (TCHF) (Excluding Directed Retry) (1800/1900-900/850)]
+[Outgoing External Inter-Cell Handover Commands (TCHH) (Excluding Directed Retry) (900/850-900/850)]
+[Outgoing External Inter-Cell Handover Commands (TCHH) (Excluding Directed Retry) (1800/1900-1800/1900)]
+[Outgoing External Inter-Cell Handover Commands (TCHH) (Excluding Directed Retry)
(900/850-1800/1900)]
+[Outgoing External Inter-Cell Handover Commands (TCHH) (Excluding Directed Retry) (1800/1900-900/850)]
+[Outgoing External Inter-Cell Handover Commands (Directed Retry)
(900/850-900/850)]
+[Outgoing External Inter-Cell Handover Commands (Directed Retry) (1800/1900-1800/1900)]
+[Outgoing External Inter-Cell Handover Commands (Directed Retry) (900/850-1800/1900)]
+[Outgoing External Inter-Cell Handover Commands (Directed Retry)
(1800/1900-900/850)]
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4. Minutes Per Drop, MPD
Definition: Minutes Per Drop, MPD
Formula: {60}*Traffic Volume of TCHs/Call Drops on TCH
Figure 4: Call drops during TCH assignment
Call Drops Measurement Points A1, A2, A3.
Figure 5: Call drops during handover
Call Drops Measurement Points A1, A2, A3, A4.
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Existing Formula
Minute per drop, MPD
=(CELTCHF.TFTRALACC/CELTCHF.TFNSCAN+CELTCHH.THTRALACC/CELTCHH.THNSC
AN )*CELTCHF.CFAIL/(CELTCHH.THNDROP+CELTCHH.THNDROPSUB+CELTCHF.TFND
ROP+CELTCHF.TFNDROPSUB)
TFTRALACC: Traffic level accumulator for full-rate TCH. The corresponding counter for
half-rate is THTRALACC.
TFNSCAN and THNSCAN: Every 10 seconds, the scanning counters are incremented
by one, and the traffic level counters are scanned and the scanning results are added to
the accumulation counters per cell
TFNDROP: The total number of dropped full-rate TCH in underlaid subcell. The counter
is also available for half-rate and for overlaid subcells, e.g. THNDROPSUB.
Huawei Formula
Minute per drop, MPD
={60}* Traffic Volume on TCH/ Call Drops on TCH
= {60}* K3014/ CM33
Traffic Volume on TCH
K3014: CELL_KPI_TCH_TRAF_ERL_TRAF
This counter indicates the traffic load on TCH. It is the average number of sampled TCHs,
which are measured within some periods (on a per second basis) after the TCHs are
activated.
The period of the sampling timer for the measurement is five seconds.
Call Drops on TCH
CM33:CELL_TRAF_CH_CALL_DROPS
In TCH assignment procedure or in the handover procedure after the MS accesses the
TCH assigned by the BSC, the procedure fails to be performed due to various reasons.
This measurement provides the number of Call Drops on Traffic Channel.
Alternatively, this measurement provides the number of call drops due to various
reasons after the MS is in the normal call state on the TCH.
Detail Formula:
=[Call Drops on Radio Interface in Stable State (TCH)]
+[Call Drops on Radio Interface in Handover State (TCH)]
+[ Call Drops due to No MRs from MS for a Long Time (TCH)]
+[ Call Drops due to Abis Terrestrial Link Failure (TCH)]
+[Call Drops due to Equipment Failure (TCH)]
+[Call Drops due to Forced Handover (TCH)]
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5. TCH Congestion
Definition: TCH assign failure due to congestion (no channel available)
Formula: Failed Assignments�Channel Unavailable�/Assignment Request
Figure 9: Assignment Requests per Cell
Start at Measurement Point A.
Existing Formula
TCH Congestion (%)
=(CELTCHF.TFNRELCONG+CELTCHH.THNRELCONG+CELTCHF.TFNRELCONGS
UB+CELTCHH.THNRELCONGSUB+CLSDCCH.CNRELCONG)*100
/CLTCH.TASSALL
TFNRELCONG: Number of released TCH signalling connections due to transcoder
resource congestion during immediate assignment on TCH. The corresponding counter
for half-rate is THNRELCONG. These counters are also available for overlaid subcell as
TFNRELCONGSUB and THNRELCONGSUB.
CNRELCONG: Number of released connections on SDCCH due to TCH or Transcoder
(TRA) congestion in both underlaid and overlaid subcell.
TASSALL: Number of first assignment attempts on TCH for all MS power classes.
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Huawei Formula
= 100 * Failed TCH Seizures due to Busy TCH (Traffic Channel) / (Assignment Requests
+ Outgoing External Inter-Cell Handover Requests (Directed Retry) + Outgoing Internal
Inter-Cell Handover Requests per Cell (Directed Retry)
= 100* CA312/ (CA310 + Handover Requests (Directed Retry))
Failed Assignments (Channel Unavailable)
CA312:CELL_ASS_FAIL_NO_CH
This counter measures the number of failed TCH (traffic channel) seizures due to no TCH
available. After the BSC receives the ASS REQ message from the MSC, this
measurement is triggered if the BSC cannot return the ASS CMP message or send the
ASS FAIL message to the MSC.
Detail Formula:
= [Failed Assignments (First Assignment, Channel Unavailable in Assignment Procedure)]
+[Failed Assignments (First Assignment, Channel Unavailable in Directed Retry
Procedure)]
+[Failed Assignments (Reconnection to Old Channels, Channel Unavailable in Assignment)]
+[Failed Assignments (Reconnection to Old Channels, Channel Unavailable in Directed
Retry)]
Assignment Requests
CA310:CELL_ASS_REQ
This measurement provides all the assignment requests received by the BSC.
Detail Formula:
=[Assignment Requests (Signaling Channel)]
+[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)]
Handover Requests (Direct Retry)
Outgoing External Inter-Cell Handover Requests (Directed Retry) + Outgoing Internal
Inter-Cell Handover Requests per Cell (Directed Retry)
This measurement is triggered when the BSC initiates a directed retry procedure.
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Detail Formula:
= H3301W:CELL_INTERBSC_OUTCELL_HO_REQ_DR_900_900
+ H3301X:CELL_INTERBSC_OUTCELL_HO_REQ_DR_1800_1800
+ H3301Y:CELL_INTERBSC_OUTCELL_HO_REQ_DR_900_1800
+ H3301Z:CELL_INTERBSC_OUTCELL_HO_REQ_DR_1800_900
+ H3101W:CELL_INTRABSC_OUTCELL_HO_REQ_DR_900_900
+ H3101X:CELL_INTRABSC_OUTCELL_HO_REQ_DR_1800_1800
+ H3101Y:CELL_INTRABSC_OUTCELL_HO_REQ_DR_900_1800
+ H3101Z:CELL_INTRABSC_OUTCELL_HO_REQ_DR_1800_900
6. SDCCH Congestion (including reattempt)
Definition: SDCCH Congestion (including reattempt)
Formula: Failed SDCCH Seizures due to Busy SDCCH/SDCCH Seizure Requests
Measurement point:
Figure 10: Immediate Assignment Procedure
Start Measurement Point C.
Existing Formula
SDCCH Congestion (%) (including reattempt)
=(CLSDCCH.CCONGS+CLSDCCHO.CCONGSSUB)*100/CLSDCCH.CCALLS
CCONGS: Congestion counter for underlaid subcell. Stepped per congested allocation
attempt. The counter for overlaid subcell is CCONGSSUB.
The SDCCH congestion counters are incremented when an allocation attempt in a
resource type fails due to no idle channels.
CCALLS: Channel allocation attempt counter (on SDCCH).
The allocation attempt counters are incremented at every attempt to allocate an SDCCH
in a resource type in the cell, regardless of whether the allocation succeeded or failed.
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Allocation attempts are made at signalling connection setup, at handover and at
assignment.
Huawei Formula detail
SDCCH Congestion (%)
=100* Failed SDCCH Seizures due to Busy SDCCH/ SDCCH Seizure Requests
=100* K3001/ K3000
Failed SDCCH Seizures due to Busy SDCCH
K3001:CELL_KPI_SD_CONGEST
In the immediate assignment procedure, when the SDCCH is requested but the cell has
no SDCCH available, the BSC measures the counter.
Detail Formula:
= [Failed Channel Assignments due to Busy or Not Configured Channels in Immediate
Assignment Procedure (SDCCH)]
+ [Failed Internal Intra-Cell Handovers (Channel Unavailable) (SDCCH)]
+ [Failed Incoming Internal Inter-Cell Handovers (Channel Unavailable) (SDCCH)]
+ [Failed Incoming External Inter-Cell Handovers (Channel Unavailable) (SDCCH)]
SDCCH Seizure Requests
K3000:CELL_KPI_SD_REQ
In the immediate assignment procedure, the BSC receives the CHANNEL REQUIRED
message from the BTS and measures this counter if the required channel is the SDCCH.
Detail Formula:
= [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 Internal Inter-Cell Handover Requests (SDCCH) (1800/1900-1800/1900)]
+[Incoming Internal Inter-Cell Handover Requests (SDCCH) (900/850-1800/1900)]
+[Incoming Internal Inter-Cell Handover Requests (SDCCH) (1800/1900-900/850)]
+[Incoming External Inter-Cell Handover Requests (SDCCH) (900/850-900/850)]
+[Incoming External Inter-Cell Handover Requests (SDCCH) (1800/1900-1800/1900)]
+[Incoming External Inter-Cell Handover Requests (SDCCH) (900/850-1800/1900)]
+[Incoming External Inter-Cell Handover Requests (SDCCH) (1800/1900-900/850)]
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7. Paging Success Rate %
Definition: Paging Success Rate
Formula: All paging response from A interface / First paging request time
Figure 7. Paging Procedure:
8. Random Access Success Rate %
Definition: Random access success rate.
Formula: Immediate Assignment Command /Channel Requests
Figure 6: Channel Request
RACCH received at Measurement point A.
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Existing Formula
Random Access Success Rate (%)
= RANDOMACC.CNROCNT*100/ (RANDOMACC.CNROCNT + RANDOMACC.RAACCFA)
CNROCNT: Counter for all accepted random accesses that means all except failed
random accesses.
RAACCFA: The failed random access counter (RAACCFA) is incremented for a Random
access received with too high TA, values that are not used or in case of "software file
congestion".
Huawei Formula
Random Access Success Rate (%)
=100* Channel Requests (Circuit Service)/(Channel Requests (Circuit Service) +
Channel Requests (Protocol Incompatible))
= CA300J / (CA300J + A300K)
Channel Requests (Circuit Service)
CA300J:CELL_IMM_ASS_REQ
This measurement provides the channel requests from all circuit services for multiple
causes. The BSC measures this counter when receiving the CHANNEL REQUIRED
message from the BTS.
Detail Formula:
= [Channel Requests (MOC)]
+ [Channel Requests (MTC)]
+ [Channel Requests (Emergency Call)]
+ [Channel Requests (Call Re-establishment)]
+ [ Channel Requests (Location Updating)]
Channel Requests (Protocol Incompatible)
A300K:CELL_CH_REQ_PROTOCOL_INCOMPATIBLE
To obtain the service from the network, an MS sends a CHAN REQ message on the RACH.
After receiving this message, the BTS sends a CHAN RQD message to the BSC for a
dedicated channel. The access cause of channel requests for this counter is that the
protocol is incompatible.
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9. PDCH Allocation Success Rate (%)
Definition: PDCH Allocation Success Rate(%)
Formula: 1- Number of packet channel allocation failures / Number of packet channel
allocation attempts
Existing Formula
PDCH Allocation Success Rate (%)
= (1 - CELLGPRS.PCHALLFAIL/CELLGPRS.PCHALLATT)*100
PCHALLFAIL: Number of packet channel allocation failures. The counter value is
incremented when a PDCH allocation request is done and there are no channels
available in the cell to be allocated for PDCHs.
PCHALLATT: Number of packet channel allocation attempts. Packet Channel Allocation
Attempt per cell (PCHALLATT). The counter value is incremented at each request to
allocate PDCHs in the cell. No request to allocate PDCHs is done if there are no unblocked
traffic channels in the cell.
Huawei Formula detail
PDCH Allocation Success Rate (%)
= 100* Number of Successful Uplink Assignments/ Number of Uplink Assignments
= 100* A9502/ A9501
Number of Successful Uplink Assignments
A9502: SUCC_UPLINK_ASS
This measurement provides the number of successful uplink assignments in a
granularity period. Successful assignment means that the BSC receives the uplink data
block or single block.
Number of Uplink Assignments
A9501: UPLINK_ASS
This measurement provides the number of uplink assignments in a granularity period.
Upon receipt of the PACKET CHANNEL REQUEST from the RACH, the BSC sends a
PACKET UPLINK ASSIGNMENT message on the CCCH.
Figure 6B: Request and Successful PDCH Allocation
A9501 A9502
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10. TBF Establishment Success Rate (%)
Definition: TBF Establishment Success Rate (%)
Formula: The number of Downlink TBF successful establishment / The number of
Downlink TBF establishment Attempts
Existing Formula
TBF Establishment Success Rate (%)
= (1–CELLGPRS.FAILDLTBFEST/CELLGPRS.DLTBFEST)*100
FAILDLTBFEST: The total number of attempts to establish a downlink TBF that
resulted in a failure due to lack of resources.
DLTBFEST: The total number of attempts to establish a downlink TBF. The counter
DLTBFEST counts the number of both successful DL TBF establishment attempts (either
via CCCH, PACCH or PCCCH).
Huawei Formula detail
TBF Establishment Success Rate (%)
=100 * (1- ((Number of Failed Downlink GPRS TBF Establishments due to No Channel
+ Number of Failed Downlink EGPRS TBF Establishments due to No Channel) /
(Number of Downlink GPRS TBF Establishment Attempts+ Number of Downlink EGPRS
TBF Establishment Attempts)))
=100*(1- ((A9103+ A9303)/( A9101+ A9301)))
Number of Failed Downlink GPRS TBF Establishments due to No Channel
A9103: DOWN_GPRS_TBF_ESTB_FAIL_NO_CHAN_RESP
This measurement provides the number of failed downlink GPRS TBF establishments
due to no channel in a granularity period.
Number of Failed Downlink EGPRS TBF Establishments due to No Channel
A9303: DOWN_EGPRS_TBF_ESTB_FAIL_NO_CHAN_RES
This measurement provides the number of failed downlink EGPRS TBF establishments
due to no channel in a granularity period.
Number of Downlink GPRS TBF Establishment Attempts
A9101: DOWN_GPRS_TBF_ESTB_ATMP
This measurement provides the number of downlink GPRS TBF establishment attempts
in a granularity period.
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Number of Downlink EGPRS TBF Establishment Attempts
A9301: DOWN_EGPRS_TBF_ESTB_ATMP
This measurement provides the number of downlink EGPRS TBF establishment attempts
in a granularity period.
Note: Allocation of more resources is mainly the solution for the improvement of this
KPI.
11. PDP Context Activation Success Rate (%)
Definition: PDP Context Activation Success Rate (%)
Formula: Successful times of PDP Context Activation / Requests of PDP Context
Activation *100
Figure 8. Reasons for PDP Context Activation Failures.
If the PDP context set up time is larger than 20 second or a failure during the set up, the
PDP context set up is considered to be failed.
Set up time = the time between the first "Channel request" and "PDP activation accept".
Exclusion cases:
For PDP activation procedure:
1) No "missing or unknown APN" cause failure,
2) No "unknown PDP address or PDP type" cause failure,
3) No user authentication cause failed,
4) Service option are all supported,
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5) Requested service option has been subscribed,
6) Error of HLR Subscribed Data is excluded,
7) At low traffic conditions and excludes blocked calls due to insufficient traffic channel
or poor air interface quality.
8) Excludes all failure caused by bugs of mobile stations.
For Attach Procedure:
1) No GPRS service not allowed,
2) Authorized subscriber and Subscribed Data is accurate,
3) The failure with the cause of "Illegal MS" is not caused by network and therefore need
be excluded.
4) Roaming is allowed
5) At low traffic conditions and excludes blocked calls due to insufficient traffic channel
or poor air interface quality.
6) Excludes all failure caused by bugs of mobile stations or SIM.
7) SS7 route data is correct on all the SS7 Node equipment.
8) SS7 bearing network provide stable service.
This KPI is measured by the core network(SGSN).
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12. Proposal for SDCCH drop Rate
Definition: SDCCH call drop rate
Formula: Call Drops on SDCCH/Successful SDCCH Seizures
Figure1: Immediate assignment measurement procedure
Successful SDCCH seizures are measured at point C.
Existing Vendor Formula
SDCCH DROP Rate (%)
= (CLSDCCH.CNDROP-CLSDCCH.CNRELCONG)*100 / CLSDCCH.CMSESTAB
(CNDROP – CNRELCONG): The total number of dropped SDCCH channels in a cell
excluding drops due to radio resource congestion that is when there is congestion on
TCH or congestion on transcoder resources.
CMSESTAB: Successful MS establishment on SDCCH.
Huawei Formula
=100* Call Drops on SDCCH (Call Type) / Call Setup Indications (SDCCH) (Circuit
Service)
= 100* CM30C/ CA3030J
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Call Drops on SDCCH (Call Type)
CM30C:CELL_SD_CALL_DROPS_CALL
This counter measures the call drops on the SDCCH in a cell. The causes for the call
drops include the following:
The air interface is faulty.
No MRs from the MS is received for a long time.
The Abis interface is faulty.
The equipment is faulty.
The handover is performed forcibly.
Detail Formula:
= Call drops on radio interface (SDCCH )(call type)
+ Call drops due to other causes received on SDCCH in stable state (call initiation)(SDCCH)
+ Call drops due to other causes received on SDCCH in stable state (paging
response)(SDCCH)
+ Call drops due to other causes received on SDCCH in stable state (call
re-establishment)(SDCCH)
+ Call drops due to other causes received on SDCCH in stable state (emergency
call)(SDCCH)
Call Setup Indications (SDCCH) (Circuit Service)
CA3030J:CELL_IMM_ASS_SUCC_SD
This measurement provides the indications of call setup on SDCCH for the circuit
service.
Detail Formula:
= [Call Setup Indications (MOC Non SMS) (SDCCH)]
+ [Call Setup Indications (MOC SMS) (SDCCH)]
+ [Call Setup Indications (MTC) (SDCCH)]
+ [Call Setup Indications (emergency Call) (SDCCH)]
+ [Call Setup Indications (Call Re-establishment) (SDCCH) ]
+ [Call Setup Indications (Location Updating) (SDCCH)]
+ [Call Setup Indications (IMSI detach) (SDCCH)]
+ [Call Setup Indications (SS) (SDCCH)]
+ [Call Setup Indications (Location Updating) (SDCCH)]
+ [Call Setup Indications (Others) (SDCCH)]
If this KPI is acceptable, FAC value shall be decided after GP provide existing statistics
for the related counters.
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End of Document