s01m05 5 handover indicators

8/22/2019 S01M05 5 Handover Indicators

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Section 1 Module 5 Page 1

All Rights Reserved Alcatel-Lucent 20103JK12195AAAAWBZZA Issue 1

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All Rights Reserved Alcatel-Lucent 2010

Module 5Handover Indicators

3JK12195AAAAWBZZA Issue 1

Section 1B11 GSM QoS Monitoring

GSM B11BSS B11 GSM Quality of Service & Traffic Load Monitoring

TMO18096 D0 SG DEN I1.0 Issue 1


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GSM B11 BSS B11 GSM Quality of Service & Traffic Load MonitoringB11 GSM QoS Monitoring Handover Indicators

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First editionLast name, first nameYYYY-MM-DD01

RemarksAuthorDateEdition

Document History


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Module Objectives

Upon completion of this module, you should be able to:

Explain what are the main Handover counters and indicators provided by theAlcatel-Lucent BSS in order to monitor the quality of handovers


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Module Objectives [cont.]

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Table of Contents

Switch to notes view!Page

1 Handovers Overview 7Description 8Types 9

2 Intra-Cell Handovers 10

Intracell HO - Success 11Failure Causes 12Failure - Congestion 13Failure - Radio Failure with ROC 14Failure - Radio Failure with Drop 15Failure Other Drops "BSS" 16Main Counters 17

3 Internal Intercell Handovers 18Internal HO Success (Async) 19HO COMMAND message 20Incoming Internal HO - Failures 21Incoming Internal HO - Congestion 22Incoming Internal HO - Radio Failure 23Incoming Internal HO - Counters 24

Incoming Internal HO - Indicators 25Outgoing Internal HO - Failures 26Outgoing Internal HO - Radio Failure ROC 27Outgoing Internal HO - Radio Failure Drop 28Outgoing Internal HO - Counters 29Outgoing Internal HO - Indicators 30Intra-Cell HO / Internal HO - Exercise 31

4 External Intercell Handovers 32External HO - Success 33External HO - Failures 34Incoming External HO - Congestion 35Incoming External HO TTCH (CIC) Congestion 36Incoming External HO - Radio Failure 37Incoming External HO - Counters 38Incoming External HO - Indicators 39Outgoing External HO - Failures 40Outgoing External HO - Radio Failure with ROC 41Outgoing External HO - Radio Failure Drop 42Outgoing External HO - Counters 43Outgoing External HO - Indicators 44External HO - Exercise 45

5 Handovers QoS per Adjacency 46Type 180 Counters 47Type 180 Indicators 48Type 26: TCH outgoing handover per adjacency 50Type 27: 2G TCH incoming handover per adjacency 51Type 27 Indicators 52

6 Inter-PLMN and Inter-RAT 53Inter-PLMN HO Description 54Inter-PLMN Indicators 55

2G-3G Indicators 567 Key Performance Indicators 57

Handover Cause Distribution 58Handover Standard Cause Distribution 59Handover Cause Distribution 60Outgoing Handover Success Rate 61Incoming Handover Success Rate 62


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Table of Contents [cont.]

Switch to notes view!Page

Handover Failure Main Causes 63


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1 Handovers Overview


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All RightsReserved Alcatel-Lucent 2010


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z Handovers are detected & prepared by the BSC

Algorithms are checked

Radio resources are allocated

z MS moves from 1 TCH in the Serving Cell to 1 TCH in the Target Cell


Description

BSC

CELL (S)

CELL (T)

1 Radiolink Measurements

BTS

2 Active Channel Preprocessing

4

HO Detection

Candidate Cell Evaluation

5 HO Preparation

6 HO Execution

3

channel activation

handover command

note: Handovers are not only from TCH to TCH:

HO SDCCH to SDCCH (SDCCH HO)

HO SDCCH to TCH (=directed retry)


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Types

Intracell IntercellNew TCH is in anotherTRX of the current cell

New TCH is in anothercell

Internal ExternalServing and Target cellsbelong to the same BSC

(intra-BSC)

Serving and Target cellsbelong to different BSCs

(inter-BSC)

Incoming OutgoingPoint of view from the

target cellPoint of view from the

serving cell

Synchronous Async.Seving and Target cells

are synchronizedServing and Target cells

are not synchronized

Emergency Better CellIf the MS doesn't leavethe current channel, a

call drop will occur

The Target cell is betterthan the Serving cell


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2 Intra-Cell Handovers


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Intracell HO - Success

MS Cell BSC *TC* MSC

(detection of intracell HO)

Physical Context Request

Physical Context Confirm

Channel Activation (new ch)

Channel Act. Ack (new ch)

Assignment CommandAssign Command

SABM (new ch)

UA (new ch)

Assign Complete (new ch)

Assign CompleteHandover Performed

RF Channel Release

RF Channel Release Ack

Establish Indication (new ch)

T9108

T9103

T3107

MC870

MC662

MC871

BSC Shared DTM Info Indicationonly for DTM-capable MS

MFS

Both SDCCH and TCH are counted together.

The T3107 timer is also used as the guard timer of the channel change procedure during an intra cell handover.

The default value for T3107 is 14 seconds.

The BSC will send BSC Shared DTM INFO Indication to inform the MFS the successful end of the procedure if

the conditions below are fulfilled:

z EN_DTM = enabled

z The MS is DTM capable

by default : T3107 = 14sec


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Failure Causes

z Handover Preparation:

Congestion HO_Cell_cong

Preparatio Failure HO_Cell_prep_fail *

z Handover Execution: Reversion to old channel HO_Cell_ROC

Drop radio HO_Cell_drop_radio

Drop due to BSS problem HO_Cell_drop_BSS *

(*) No specific counter


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Failure - Congestion

MS Cell BSC

Measurement ResultMeasurement Report

(detection of intracell HO) MC870

(no free channel) MC561 MC101

TCH / SDCCH

MC561:

In MX BSC, this counter is incremented whenever an intra-cell TCH handovercannot be performed due to the TCH processing capacity of CCP reaches thelimit defined by the MAX_TCH_PER_CCP parameter. In this case, MC926 isalso incremented by one.

In IP mode, this counter is increased by 1 if:- the cell mapped on a BTS is in IP congestion status;- or the TCH processing capacity of AbisBTSGroup reaches the limit definedby the NB_MAX_ACTIVE_TCH_TS parameterB

11MR2

B11

From B7, MC561 replaces MC61 (B6).

As the counting of the Abis-TCH congestion case was in restriction in B8: MC61(B6) = MC561(B7)


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Failure - Radio Failure with ROC

MS Cell BSC

Assignment CommandAssign Command (old)

SABM (new)

UA (new)

Assign Failure (old) Assign Failure

RF Channel Release (new)

RF Channel Release Ack (new)

Establish Indication

T3107

MC667

MC871

X

SABM (new)

UA (new)X

T200_TF

200ms

N200_TTF

try

times

SABM (new)

UA (new)X

200ms

etc etc etc

Physical Context Request (new)

Physical Context Confirm (new)

stop

In this example, the Downlink path on the new channel is faulty (interference, path unbalance ).

It is also possible the MS immediately sends an Assign Failure (without even attempting to connect to the new

channel).

N200_TTF = 34

T200_TF = 200ms

200 * 35 = 7seconds

MC667 = C107 (sdcch intracell ho fail roc) + C67 (tch intracell ho fail roc)


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Failure - Radio Failure with Drop

MS Cell BSC

Assignment CommandAssign Command (old) T3107MC871?

?

MC663Channel release ofold and new channels

MC663 = C103 (sdcch) + C63 (tch)


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Failure Other Drops "BSS"

z Based on missing successes:

HO_Cell_drop_BSS =

HO_Cell_allocated - HO_Cell_success - HO_Cell_drop_radio - HO_Cell_ROC

z Another counter is linked to various causes of drops during HOpreparation and execution phases:

MC14a (Call_drop_HO_Prep_Exec_BSS_failure) is incremented when :

TCH Channel Activation is acknowledged negatively

Channel Activation procedure (T9103) expires

LapD failure, or Abis failure, or BSC boards failure

48.058 ERROR REPORT message with a cause value of "O&M intervention" or"message sequence error" is received on Abis interface from either theserving or the target cell

48.058 CONNECTION FAILURE INDICATION message with a cause value of"remote transcoder failure" during the Channel Activation procedure

Intra cell HO failures due to BSS problems are deduced from other counters.


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Main Counters

z HO FAIL. CASES > intracell HO counters

Request MC870

Congestion MC561+MC101

BSS Pb MC870-MC871-(MC561+MC101)

Attempt MC871

Reversion old channel MC667

Drop radio MC663

BSS Pb MC871-MC662-MC667-MC663

Success MC662

Preparation

Execution

INTRACELL Handov er

REQUEST

CONGESTION

ATTEMPT

REVERSION OLD CHANNEL

DROP RADIO

DROP BSS

SUCCESS

BSS PB

Preparation Failure

Execution Failure


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3 Internal Intercell Handovers


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Internal HO Success (Async)

MS Target Cell BSC MSC

(detection of intercell HO)

Channel Activation (new ch)

Channel Act. Ack (new ch)

(opt) TFO Modification Req

HO Access * 4

UA (new ch)

Assign Complete (new ch) Handover Complete

Handover Performed

HO Detection

T9103

BSC Shared DTM Info Indicationonly for DTM-capable MS

MFS

Serving Cell

HO Command

Establish IndicationSABM (new ch)

(old channel release)

MC871 T3103

MC655a MC830

MC652

MC660

MC656

speech

speechTCH

TCH

MC830=C230 (tch) + C330 (sdcch)

After the HO PERFORMED is sent to the MSC.

z if DTM is enabled in the old cell, it sends a BSCGP BSC shared DTM info indication (CS_Flag = 0) to the MFS.

z if DTM is enabled in the new cell, it send a BSCGP BSC shared DTM info indication (CS_flag = 1) to the MFS.

The MFS in the old cell deletes the MS context and creates an MS context according to the information

received in the BSCGP BSC shared DTM info indication.

In case of Sync HO, the HO COMMAND contains a valid timing advance value, so that the MS will use this timing

advance in the target cell.

If the HO is not sync, then the HO COMMAND indicates that the HO is async, and the MS will send the HO

ACCESS with TA=0. The target BTS will need to compute the TA.


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HO COMMAND message

z The TCH in the Target cell is fully described in the HO Command

BCCH, BCC, NCC

TCH Frequency (or Frequency Hopping MA List, MAIO, HSN, etc.)

TS Number

Ciphering Speech Codec (only for phase 2 MS)

Timing Advance information (if Sync HO)

Serving CellHO Command

TCH


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Incoming Internal HO - Failures

z Causes of Failures :

Handover procedure from the target cell point of view

Handover Preparation:

y Congestion: no RTCH available in the target cell

y "Other" problem (no specific counter)

Handover Execution:

y Radio problem: the MS fails to access the new channel{ which can lead to a "drop" or a "reversion to old channel" (cf. outgoing indicators)

y BSS problem (no specific counter)


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Incoming Internal HO - Congestion

MS Serving Cell Serving BSC MSC

MEAS REPORT-----------------------------> MEASUREMENT RESULT

--------------------------------------------------------------> MC830No free TCH

MC551

From B7, MC551 replaces MC51of B6.

As the counting of the Abis-TCH congestion case was in restriction in B8: MC51(B6) = MC551(B7)


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Incoming Internal HO - Radio Failure

z MS access problem

MS serving cell target cell BSC MSC

MEAS REP

-----------------------> MEASUREMENT RESULT

------------------------------------------------------------------------>

CHANNEL ACTIVATION

HO CMD HANDOVER COMMAND

ESTABLISH INDICATION

UA ------------------------------------------------------------------------>

------------------------------------------------------------------------> MC653

Release of new channel

All incoming internal HO failures due to radio problems are counted in the same counter MC653.

Both radio failures with Reversion Old Channel and radio drop are counted together.


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Incoming Internal HO - Counters

Request MC830



Attempt MC831

Radio (MS access problem) MC653

BSS Pb MC831-MC652-MC653

Success MC652

Execution

Preparation

INCOMING INTERNAL Handover

REQUEST

CONGESTION

ATTEMPT

MS ACCESS PB

BSS PB

SUCCESS

BSS PB

Preparation Failure

Execution Failure


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Incoming Internal HO - Indicators

HO_Inc_BSC_request

HO_Inc_BSC_success

HO_Inc_BSC_allocated HO_Inc_BSC_cong HO_Inc_BSC_prep_fail

HO_Inc_BSC_fail_radio HO_Inc_BSC_fail_BSS

Refer to BSS - DEFINIT ION OF QUALIT Y OF SERVICE INDICATORS:

Handover Statistics INDICATORS > Incoming handover > Incoming Intra BSC

z GHOIBEFR: efficiency of the incoming internal HO execution

z GHOIBCGR: rate of incoming internal HO failures due to congestion

z GHOIBPFR: rate of incoming internal HO failures due to BSS during the preparation phase

z GHOIBFLRR: rate of incoming internal HO failures due to radio problems

z GHOIBFLBR: rate of incoming internal HO failures due to BSS during the execution phase


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Outgoing Internal HO - Failures

z Cases of Failures:

Handover procedure from the serving cell point of view


y Preparation Failures (no details)

Handover Execution:

y radio problem: the MS reverts to the old channel

y radio problem: the MS drops

y BSS problem (no specific counter)


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Outgoing Internal HO - Radio Failure ROC

MS Serving cell Target Cell BSC


HO DETECTIONPHYSICAL INFORMATION ---------------------------------->


UA ---------------------------------->


UA ------------------------------------------------------------------------>

------------------------------------------------------------------------> MC657

Release of new channel


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Outgoing Internal HO - Radio Failure Drop

clear_request: ask the MSC to release the connection In case of call drop due to HO, the cause is "radio interface message failure"

(for Alcatel-Lucent)

MS serving cell target cell BSC MSC

MEAS REP

-----------------------> MEASUREMENT RESULT

------------------------------------------------------------------------> MC655A

CHANNEL ACTIVATION



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Outgoing Internal HO - Counters

z HO FAIL. CASES > Outgoing internal HO counters

Preparation Request MC655A

Any preparation failure MC655A-MC660

Attempt MC660


Drop radio MC658


Success MC656

Execution

OUTGOING INTERNAL Handov er

REQUEST

CONGESTION

ATTEMPT


DROP RADIO

BSS PB

SUCCESS

BSS PB

Preparation Failure

Execution Failure


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Outgoing Internal HO - Indicators

HO_Out_BSC_request

HO_Out_BSC_success

HO_Out_BSC_required HO_Out_BSC_prep_fail

HO_Out_BSC_drop_radio HO_Out_BSC_drop_BSSHO_Out_BSC_ROC


Handover Statistics INDICATORS > Outgoing handover > Outgoing Intra BSC

z GHOOBRQR: efficiency of the outgoing internal HO preparation

z GHOOBEFR: efficiency of the outgoing internal HO execution

z GHOOBOCR: rate of outgoing internal HO failures due to radio problems with Reversion Old Channel

z GHOOBCDRR: rate of outgoing internal HO failures due to radio problems with drop

z GHOOBCDR: rate of incoming internal HO failures with drop (radio + BSS)


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Intra-Cell HO / Internal HO - Exercise

z With K1205, find in the PAIB29.REC file:

1) One case of intra-cell failure with reversion

2) One case of Internal handover successy Identify the target cell

yIdentify the serving cell (in CR for call establishment)

3) One case of Internal handover failure with reversion

4) One case of Internal handover failure without reversion

Time allowed:

15 minutes


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4 External Intercell Handovers


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External HO - Success

MS serving_cell BSC MSC BSC target_cell MS- MEAS_REPORT ->

------- MEAS_RESULT -------->MC645A ------ HO_REQUIRED ---------->

----------CR (HO_REQUEST) -----> MC820


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External HO - Failures

z Cases of Failures, from the target cell perspective (incoming):

HO_Inc_MSC_request

HO_Inc_MSC_success

HO_Inc_MSC_allocated

HO_Inc_MSC_fail_BSSHO_Inc_MSC_fail_radio

HO_Inc_MSC_cong HO_Inc_MSC_no_cic_alloc HO_Inc_MSC_prep_fail

(deduced)

(deduced)

"deduced" : shows all the failures that were not counted by dedicated counters, by computing the missing

successes.


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Incoming External HO - Congestion


------- MEAS_RESULT -------->MC645A ------ HO_REQUIRED ------->

----------CR (HO_REQUEST) -----> MC820


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Incoming External HO TTCH (CIC) Congestion


------- MEAS_RESULT -------->MC645A ------ HO_REQUIRED ------->

----------CR (HO_REQUEST) -----> MC820


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Incoming External HO - Radio Failure

z HO FAIL. CASES > Incoming external HO fail: MS access problem


------- MEAS_RESULT -------->MC645A ---- HO_REQUIRED ------->

----------CR (HO_REQUEST) -------------------> MC820

----------CR (HO_REQUEST) -------------------> MC820

MC643Radio interface fail : Reversion to old channel

Release of connection

All incoming external HO failures due to radio problems are counted in the same counter MC643.

Both radio failures with Reversion Old Channel and radio drop are counted together.


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Incoming External HO - Counters

Request MC820



At tempt MC821

Radio (MS access problem) MC643

BSS Pb MC821-MC642-MC643

Success MC642

Execution

Preparation

INCOMING EXTERNAL Handover

REQUEST

CONGESTION

ATTEMPT

MS ACCESS PB

BSS PB

SUCCESS

BSS PB

Preparation Failure

Execution Failure

MC41bno CIC alloc

NO CIC ALLOC

MC541a+MC81


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Incoming External HO - Indicators


Handover Statistics INDICATORS > Incoming handover > Incoming Inter BSC

z GHOIMEFR: efficiency of the incoming external HO execution

z GHOIMCGR: rate of incoming external HO failures due to radio congestion (Air or Abis TCH)

z GHOIMAMR: rate of incoming external HO failures due to CIC congestion (A TCH)

z GHOIMPFR: rate of incoming external HO failures due to BSS during the preparation phase

z GHOIMFLRR: rate of incoming external HO failures due to radio problems

z GHOIMFLBR: rate of incoming external HO failures due to BSS during the execution phase

Inter PLMN Incoming External HO Indicators (from B8)

An indicator is created for each counter:

z

REQUESTSz ATTEMPTS

z SUCCESS

In addition, these indicators show:

z the success rate of incoming inter-PLMN HOs,

z the ratio of incoming inter-PLMN HO to incoming intra-PLMN and inter-PLMN HO.


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Outgoing External HO - Failures

z Cases of Failures (Outgoing)


y No detail available, only generic "preparation failures"

Handover Execution:

y radio problem: the MS reverts to the old channel

y radio problem: the MS dropsy BSS problem (no specific counter)

HO_Out_MSC_required

HO_Out_MSC_success

HO_Out_MSC_request

HO_Out_MSC_drop_BSHO_Out_MSC_ROC

HO_Out_MSC_prep_fail

(deduced

(deduced)

HO_Out_MSC_drop_radio


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Outgoing External HO - Radio Failure with ROC


------- MEAS_RESULT -------->

MC645A ---- HO_REQUIRED ------->----------CR (HO_REQUEST) ------------------->

Radio interface fail : Reversion to old channelRelease of connection


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Outgoing External HO - Radio Failure Drop

z In this case, no reversion to old channel detected


------- MEAS_RESULT -------->

MC645A ---- HO_REQUIRED ------->----------CR (HO_REQUEST) ------------------->


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Outgoing External HO - Counters

Preparation Request MC645A

Any preparation failure MC645A-MC650

Att empt MC650


Drop radio MC648


Success MC646

Execution

OUTGOING EXTERNAL Handover

REQUEST

CONGESTION

ATTEMPT


DROP RADIO

BSS PB

SUCCESS

BSS PB

Preparation Failure

Execution Failure


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Outgoing External HO - Indicators

Refer to BSS - DEFINIT ION OF QUALITY OF SERVICE INDICATORS RELEASE:

Handover Statistics INDICATORS > Outgoing handover > Outgoing Inter BSC

z GHOOMRQR: efficiency of the outgoing external HO preparation

z GHOOMEFR: efficiency of the outgoing external HO execution

z GHOOMOCR: rate of outgoing external HO failures due to radio problems with Reversion Old Channel

z GHOOMCDRR: rate of outgoing external HO failures due to radio problems with drop

z GHOOMCDR: rate of incoming external HO failures with drop (radio + BSS)

Inter PLMN Outgoing External HO Indicators (From B8)

An indicator is created for each counter:

z REQUESTS

z ATTEMPTS

z SUCCESS

In addition, these indicators show:

z the success rate of outgoing inter-PLMN HOs,

z the ratio of outgoing inter-PLMN HO to outgoing intra-PLMN and inter-PLMN HO.


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External HO - Exercise

z In PAIB29.REC, extract (if available):

1) 1 incoming external HO success

2) 1 outgoing external HO success

3) 1 incoming external HO failure

4) 1 outgoing external HO failure

Time allowed:

15 minutes


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5 Handovers QoS per Adjacency


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Type 180 Counters

z Some handover indicators available per couple of (serving, target)cells permanently through PM type 180 counters

3 counters for each (Serving,Target) adjacency:

- C400(S,T): Incoming handovers requested

to cell T from cell S- C401(S,T): Incoming handovers attemptedto cell T from cell S

- C402(S,T): Incoming handovers successfullyperformed to cell T from cell S

both internal and external inter cell handovers are counted

both SDCCH and TCH handovers are counted

a

e

d

c

b

f

C40i(f,d)

C40i(a,b)C40i(c,b)

C40i(c,d)

According to the definition of C40i counters:

z C400(Sn,T) = MC820(T) + MC830(T)

z C401(Sn,T) = MC821(T) +MC831(T)

z C402(Sn,T) = MC642(T) + MC652(T)

z where

Sn are the serving cells considering the incoming adjacencies to cell T.

MC820(T), MC821(T), MC642(T) are the counters relating to the incoming external handovers requested,

attempted and successfully performed to cell T.

MC830(T), MC831(T), MC646(T) are the counters relating to the incoming internal handovers requested,

attempted and successfully performed to cell T.


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Type 180 Indicators

z From these 3 counters, the following indicators arecomputed:

Cell A

Cell B

Cell C

Matrix Inc allocatedrate

30

10

40

Matrix Inc successMatrix Inc efficiency

rate

200Cell C - Cell B

30300Cel C - Cell A

220Cell B - Cell C

150Cell B - Cell A

1010Cell A - Cell C

80100Cell A - Cell B

Matrix Inc unsuccessrateMatrix Inc allocatedMatrix Inc request

100

150

10

300

200220

80/100 40/80 (100-40)/100100% 100% 100%

10% 100% 10%

Fill up Fill up

Note : in NPO, when n/a is seen in the table, it means "0" (= no HO were done during the period)


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Type 180 Indicators [cont.]

z The following indicators can be computed from PM Type 180 countersin order to:

Detect the most important neighboring cells as per their traffic

y Distribution of incoming handovers performed to cell T from serving cells Sn =C402(Sx,T) / C402(Sn,T)

Ease the diagnosis of the bad handover performance of a cell

y Global Success of incoming handovers to cell T from cell S

HOOASUR = C402(S,T) / C400(S,T)

y Allocation Success of the incoming handover preparation to cell T from cell S

HOOACAR = C401(S,T) / C400(S,T)

y Efficiency of the incoming handover execution to cell T from cell S

HOOAEFR = C402(S,T) / C401(S,T)

n


Handover Statistics > HO Statistics per couple of cells > Indicators with counter type 180

z These indicators can also be used to check if a recently handover relationship is generating handover as

expected.

z They will also allow to identify the handover relationships which should be deleted since no (or very few)

handover is observed.


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Type 26: TCH outgoing handover per adjacency

z Some handover indicators are available per couple of (serving, target)cells on demand for all outgoing adjacencies of a serving cell throughPM type 26 (40 cells since B8)

Target a

Te

Serving

Tc

Tb

Tf

C72i(S,Te)

C72i(S,Tc)

Outgoing TCH handover for FDRC728Outgoing TCH handover for a traffic causeC727

Outgoing TCH handover for a better cell causeC725

Outgoing TCH handover for an emergency causeC724

Outgoing TCH handover -execution radio failures without ROCC723

Outgoing TCH handover -execution radio failures with ROCC722

Outgoing TCH handover successes.C721

Outgoing TCH handover attemptsC720


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Type 27: 2G TCH incoming handover per adjacency

z Some handover indicators are available per couple of (serving, target)cells on demand for all incoming adjacencies of a target cell throughPM type 27.

Serving a

Se

Target

Sc

Sb

Sf

C73i(Se,T)

C73i(Sc,T)

Incoming 2G TCH handover with unknown or missing causesC738

Incoming 2G TCH handover for FDRC738

Incoming 2G TCH handover for a traffic causeC737

Incoming 2G TCH handover for a better cell causeC735

Incoming 2G TCH handover for an emergency causeC734

Incoming 2G TCH handover execution radio failures with or withoutROC

C733

Incoming 2G TCH handover successes.C731

Incoming 2G TCH handover attemptsC730

Other counters are provided:

z C734(Sx,T): Incoming handovers attempted from Sx to T for an emergency cause.

z C735(Sx,T): Incoming handovers attempted from Sx to T for a better cell cause.

z C737(Sx,T): Incoming handovers attempted from Sx to T for a traffic cause.

z C738(Sx,T): Incoming handovers attempted from Sx to T for a forced directed retry cause.

The set of Type 27 counters can be retrieved for only one cell per BSS at once.


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Type 27 Indicators

z The following indicators can be computed from PM Type 27 counters inorder to ease the diagnosis of the bad incoming handover performanceof a cell:

Efficiency of the incoming handover execution to cell T from cell Sx

HOIXSUR = C731(Sx,T) / C730(Sx,T) Rate of incoming ho execution failures due to MS radio access problems to

cell T from cell Sx

HOIXCDRR = C733(Sx,T) / C730(Sx,T)

Rate of incoming ho execution failures due to BSS problems to cell T from cellSx

HOIXCDBR= [C730(Sx,T)-C731(Sx,T)-C733(Sx,T)] / C730(Sx,T)


Handover Statistics > HO Statistics per couple of cells > Indicators with counter type 27


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6 Inter-PLMN and Inter-RAT


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Inter-PLMN HO Description

z Since B8, outgoing inter-PLMN HO are available (incoming were alwaysavailable)

z Usage of CGI n the OMC-R allows to define outgoing inter-PLMN adjacencies(serving cell from own PLMN, target cell from foreign PLMN)

FRANCE ITALIE

OMC-R

External cells : belong to anotherOMC-R (from own PLMN or foreignPLMN)

Internal cells : belong to thisOMC-R

Up to 4 foreign PLMN's can bedefined in one OMC-R.

Inter-PlMN external cells aredefined by their CGI

Outgoing

Incoming

MCC is the Mobile Country Code, MNC is the Mobile Network Code, LAC is the Location Area Code, CI is the

Cell Identification.

Handovers towards cells belonging to a different PLMN are not possible ifCGI_REQD is set to 0.

Handovers towards UMTS cells belonging to a different PLMN are not possible ifCGI_3G_REQUIRED is set to0.

The MS will only measure those Neighbour cells which have a BSIC whose PLMN colour code matches with

the coding in the NCC Permitted transmitted to the MS in the SYSTEM INFORMATION TYPE 6.


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Inter-PLMN Indicators

RTCH_HO_Inc_InterPLMN_request

RTCH_HO_Inc_InterPLMN_success

RTCH_HO_Inc_InterPLMN_allocated

RTCH_HO_Out_InterPLMN_request

RTCH_HO_Out_InterPLMN_attempt

RTCH_HO_Out_InterPLMN_success

RTCH_HO_Inc_PLMN_fail_congB11

B11

RTCH_HO_Inc_InterPLMN_request_ratio

RTCH_HO_Inc_InterPLMN_request_ratio : RTCH_HO_Inc_InterPLMN_request / RTCH_HO_request


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2G-3G Indicators

HO_Inc_MSC_3G_2G_request

HO_Inc_MSC_3G_2G_success

HO_Inc_MSC_3G_2G_allocated

HO_Inc_MSC_3G_2G_fail_radio

HO_Inc_MSC_3G_2G_HOreject_HL_Time

HO_Inc_MSC_3G_2G_TCH_fail_3GcongHO_Inc_MSC_3G_2G_TCH

request

HO_Inc_MSC_3G_2G_TCH

request_emergency

HO_Out_MSC_2G_3G_required

HO_Out_MSC_2G_3G_request

HO_Out_MSC_2G_3G_success HO_Out_MSC_2G_3G_ROC

HO_Out_MSC_2G_3G_prep_fail

HO_Out_MSC_2G_3Gfailure_radio

HO_Inc_MSC_3G_2G_fail_BSS

HO_Inc_MSC_3G_2Gfail_prep_System

HO_Out_MSC_2G_3Gdrop_BSS

INCOMING

OUTGOING

HO_Inc_MSC_3G_2G_HOreject_HL_Time :

- Cumulative time (in seconds) during which the Cell is in 3G high load state

- i.e. Whenever the 3G_HOReject_Load State in the cell is reported as high or reported as indefinite while

the previous state was high. This counter shall be incremented only if THR_CELL_LOAD_3G_REJECT


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7 Key Performance Indicators


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Handover Cause Distribution

z HO CAUSE DISTRIBUTION : distribution of HO attemps by cause X : UL/DL Qual, UL/DL Lev,UL/DL Interference, Distance, Better Cell, Interband, Micro cells HO, Concentric Cell, Traffic, AMRS, TFOcauses

z Indicator aiming at measuring the efficiency of planning /optimization

GHCSTBPBR,

GHCCCELVDR,

GHCCCELVUR,

GHCCCBCPR,

GHCSTEDIR,GHCSTEIFDR,

GHCSTELVDR,

GHCSTEQLDR,

GHCSTBDRR,

GHCMBBCPR,

GHCMCEBSR,

GHCMCELVDR,

GHCMCBCPR,

GHCMCELVUR,

GHCSTEMIR,

GHCSTEIFUR

GHCSTELVUR,

GHCSTEQLUR,

GHCSTAMR,

GHCSTBTFR

Ref. nameCommen

ts

%Qual DL > 10%Qual UL > 10%Level UL > 20%Level DL > 20%Interf UL > 5%

Interf DL > 5%Better Cell < 30%

(MC67w or MC785x or MC586y or MC10zz or MC447 or MC461(MC67all + MC785all + MC586all + MC10all + MC447 + MC461)MC67all=MC671+MC672+MC673+MC674+MC675+MC676+MC677+MC6

78+MC679+MC670

MC785all = MC785a + MC785d + MC785e + MC785f (Microcell)MC586all = MC586a + MC586b + MC586c (concentric)MC10all = MC1040 + MC1044 + MC1050

HO causedistribution

UnitThresholdFormulaeIndicator


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Handover Standard Cause Distribution

z DISTRIBUTION HO CAUSE STANDARD : Distribution of Handover attempts bystandard cause : Power Budget, quality too low, level too low, highinterference and MS-BTS distance too long.

z Indicator aiming at measuring the efficiency of planning / optimizationz Interesting for comparing HO distribution after concentric or micro cellimplementation

GHCSTEIFDSR,

GHCSTEIFUSR,GHCSTEIFSR,

GHCSTELVDSR,GHCSTELVUSR,

GHCSTELVSR,GHCSTEQLDSR,GHCSTEQLUSR,

GHCSTEQLSR,GHCSTBPBSR,GHCSTEDISR

Ref. nameComments

%(MC67x) / GLOBAL HO CAUSE STANDARD MC67x = MC670 or MC672 or MC671 or MC673 or MC676 orMC677 or MC678 or MC674 or (MC670+MC672) or

(MC671+MC673) or (MC676+M677)

DistributionHO causestandard

UnitThresholdFormulaeIndicator

The Global HO cause standard indicator is defined as below:

where:

z MC670: Number of handover attempts cause 2: "uplink quality too low"

z MC672: Number of handover attempts cause 4: downlink quality too low"

z MC671: Number of handover attempts cause 3: "uplink level too low"

z MC673: Number of handover attempts cause 5: "downlink level too low"

z MC676: Number of handover attempts cause 15: "too high uplink interference level"

z MC677: Number of handover attempts cause 16: "too high downlink interference level"

z MC678: Number of handover attempts cause 12: "too low power budget"

z MC674: Number of handover attempts cause 6: "MS-BTS distance too long"


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Handover Cause Distribution

zHANDOVER CAUSE rates

Refer to BSS - DEFINIT ION OF QUALITY OF SERVICE INDICATORS:

Handover statistics INDICATORS > Handover causes

GHCXXYYYYR: Rate of specific HO cause xxyyyy versus all HO causes (Global)

z where XX = ST (standard) or MC (micro cell) or CC (concentric cell) or MB (multi band)

z and YYYY is specific to the cause


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Outgoing Handover Success Rate

zGlobal success rate of Outgoing HO : Rate of successful outgoing external and internalintercell SDCCH and TCH HO

GHOORSUR

Ref. name

This indicatorincludespreparation andexecution.

Comments

%90%

HO_Out_success/HO_Out_requiredHO_Out_success_rate

UnitThreshold

FormulaeIndicator

z Success rate of execution of Outgoing HO : Rate of successful outgoing external andinternal intercell SDCCH and TCH HO

GHOOREFR

Ref. name

This indicatortakes into accountHO execution only

(not HOpreparation).

Comments

%90%HO_Out_success/HO_Out_requestHO_Out_efficiency_rate

UnitThreshold

FormulaeIndicator

Global Outgoing HO success rate: represents the global efficiency of the outgoing handovers performed from

one cell to any of its neighboring cells (same BSS or not).

Efficiency of Outgoing HO execution: represents the efficiency of the channel change procedure duringoutgoing handovers performed from one cell to any of its neighboring cells (same BSS or not). It does not take

into account the HO failures that can occur during the preparation phase when the new channel is being

selected and activated.

HO_Out_success = HO_Out_MSC_2G_3G_success + HO_Out_MSC_2G_2G_success + HO_Out_BSC_success

HO_Out_required = HO_Out_MSC_2G_2G_required+HO_Out_BSC_required+HO_Out_MSC_2G_3G_required

HO_Out_request = HO_Out_MSC_2G_2G_request+HO_Out_BSC_request+HO_Out_MSC_2G_3G_request


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Incoming Handover Success Rate

zGlobal success rate of Incoming HO : Rate of successful incoming external and internalintercell SDCCH and TCH HO

GHOIRSUR

Ref. nameComments

%90%

HO_Inc_success / HO_Inc_requestHO_Inc_success_rate

UnitThreshold

FormulaeIndicator

z Success rate of execution of Incoming HO : Rate of successful incoming external andinternal intercell SDCCH and TCH HO

GHOIREFR

Ref. name

Excludingcongestion failures

and BSS

preparationfailures from

requests.

Comments

%90%HO_Inc_success / HO_Inc_allocatedHO_Inc_efficiency_rate

UnitThreshold

FormulaeIndicator

Global Incoming HO success rate: represents the global efficiency of the incoming handovers performed to one

cell from any of its neighboring cells (same BSS or not).

Efficiency of Incoming HO execution: represents the efficiency of the channel change procedure duringincoming handovers performed to one cell from any of its neighboring cells (same BSS or not). It does not take

into account the HO failures that can occur during the preparation phase when the new channel is being

selected and activated.

HO_Inc_success = HO_Inc_MSC_success + HO_Inc_BSC_success

HO_Inc_request = HO_Inc_MSC_request + HO_Inc_BSC_request

HO_Inc_allocated = HO_Inc_MSC_allocated + HO_Inc_BSC_allocated


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Handover Failure Main Causes

z Main Causes of handover failure

Bad handover parameters settings (check with the RFT Training)

Hardware fault (TRX board fault)

Congestion

Interference

Coverage

Clock or timer mismatching

Coverage

z Coverage hole

Coverage hole may exist when coverage areas of two BTSs do not overlap or there are some big obstacles in the

coverage area, this lead to no signal or very poor signal level.

z Over shooting

In the actual network, the high BTS antenna can propagate far away along a road and serve in area which its

not suppose to serve in; which result in the "isolate Island" problem.

Interference

Interference usually occurs when more than one idle channel appear in the highest interference band. If the

interference is internal, it will usually increase with the growth of traffic. If the interference is external, it is

usually not related to traffic, but it may increase with the traffic growth if the interference is from the close

analog network.

There is also the possibility to work with the RMS (per TRX).

If there are high Rx_lev but bad quality, it indicates that co-channel and/or adjacent-channel interference

s01m05 5 handover indicators

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