appendix for kpi formula_061108

Appendix for KPI Formula Security level

2008-06-12 HUAWEI Confidential /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



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:



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



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)] +


Retry) (900/850-GSM1800/1900)] +


Retry) (GSM1800/1900-900/850)] +

[Outgoing Internal Inter-Cell Handover Requests per Cell (TCHF) (Excluding Directed

Retry) (900/850-900/850)] +


Retry) (GSM1800/1900-GSM1800/1900)] +


Retry) (900/850-GSM1800/1900)] +


Retry) (GSM1800/1900-900/850)] +

[Outgoing Internal Inter-Cell Handover Requests per Cell (TCHH) (Excluding Directed

Retry) (900/850-900/850)] +


Retry) (GSM1800/1900-GSM1800/1900)] +


Retry) (900/850-GSM1800/1900)] +


Retry) (GSM1800/1900-900/850)] +

[Outgoing Internal Inter-Cell Handover Requests per Cell (Including Directed Retry)

(900/850-900/850)] +


(GSM1800/1900-GSM1800/1900)] +


(900/850-GSM1800/1900)] +




(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)] +


Retry) (900/850-GSM1800/1900)] +


Retry) (GSM1800/1900-900/850)] +

[Failed Outgoing Internal Inter-Cell Handovers per Cell (TCHF) (Excluding Directed Retry)

(900/850-900/850)] +


(GSM1800/1900-GSM1800/1900)] +


(900/850-GSM1800/1900)] +


(GSM1800/1900-900/850)] +

[Failed Outgoing Internal Inter-Cell Handovers per Cell (TCHH) (Excluding Directed Retry)

(900/850-900/850)] +


(GSM1800/1900-GSM1800/1900)] +


(900/850-GSM1800/1900)] +


(GSM1800/1900-900/850)] +

[Failed Outgoing Internal Inter-Cell Handovers per Cell (Including Directed Retry)

(900/850-900/850)] +


(GSM1800/1900-GSM1800/1900)] +


(900/850-GSM1800/1900)] +


(GSM1800/1900-900/850)]



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)]



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



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}



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 (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 (TCHH) (Excluding Directed Retry) (900/850-900/850)]


+[Outgoing External Inter-Cell Handover Commands (TCHH) (Excluding Directed Retry)

(900/850-1800/1900)]


+[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)]



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.



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)]



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.



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.



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.



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 External Inter-Cell Handover Requests (SDCCH) (900/850-900/850)]






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.



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.



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.


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



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).


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.



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,



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).



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



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.



End of Document

appendix for kpi formula_061108

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