Accessiblity Cs Voice Analysis. Finalppt

Soc Classification level

1 © Nokia Siemens Networks DNO Optimization Processes / JC Ejarque / 15.09.09

Optimization Processes- veeresh 3G Performance Engineer

Soc Classification level

2 © Nokia Siemens Networks DNO Optimization Processes / JC Ejarque / 15.09.09

CSSR VOICE ACCESSIBLITY OPTIMIZATION—COUNTERS

3 © Nokia Siemens Networks DNO Optimization Processes / JC Ejarque

Perform data analysis and assessment

1. Assess weekly average PLMN KPI performance to identify KPIs below targets

• Start from bigger picture assessment (PLNM -> RNC -> Cluster -> WCEL )

• Weekly average will smooth the performance and gives better accuracy of performance assessment as daily performance varies a lot especially in unloaded network

• 2. Assess network performance at RNC/Area level to check if bad performance happens across network or only particular RNC/Area

• Compare different RNC/Regions performance

• 3. Apply drill down approach to assess bad performing KPIs in WCEL level

• Identify the failure call phases

• Categorizing failure ratio or distribution of each counters (radio, AC, transmission, BTS, RNC)

• Identify main cause of underperforming KPIs

• 4. Prioritize analysis

• Filter using high number of failures or high number failure ratio (weighting)

• Identify top 50 worst cells


Perform data analysis and assessment

Using smart 3G RAN Reports,

Weekly KPI

( PLMN)

< X %

No action

needed

No

Yes

Yes

No

System Program (PLMN)

Weekly KPI

(RNC)

< X % ?

System Program (RNC)

Daily KPI

(WCEL)

< X%

Identify Call failure

phases of bad

performing KPIs,

for example

CSSR

Identify failures root-

causes and failure

distribution of bad

KPIs

Identify Top50 Worst

Cells based on

highest number of

root causes failures

System Program (WCEL) Others 3G RAN Reports

Others 3G RAN Reports Yes

Mataching failure

distribution into

network topology

System Program (WCEL)

Solution Proposal

Mapinfo


CSSR CS/PS Analysis Failure counters


CSSR definition


Low in CSSR?

Identify call setup failure phases Call Setup Phases

CSSR affected if any of the followings take

place.

1. RRC Conn. Setup Fail

2. RRC Conn. Access Fail

3. RAB Setup Fail

4. RAB Setup Access Fail

Call Setup Phase

RRC

Conn. Req

RRC

Conn. Setup

RRC

Conn. Acc RRC

Conn. Act RAB Setup RAB Drop

Call Setup Success Call Drop

Connected


Low in CSSR?

RRC/RAB Setup & Access Analysis Process Flow Chart

Sites OK ?

Cell and Neighbour Cells availabilityAlarms/Tickets

Setup /Access

Yes

Setup /Access

Setup Failure Cause?

Capacity Optimisation

BTS/TRANS/FROZBS

UL/DL Interference (DL codes)

AC

TroubleshootingRNC

RF Optimisation

Top (N) RRC Setup and Access failures

Top (N) RAB Setup and Access failures

Coverage/ Interference

setup

setup

Interference

Coverage

3G cell at inter-RNC border ?

SRNS Relocation troubleshooting

Yes

NO

Access

Access

Sites OK ?

Cell and Neighbour Cells availabilityAlarms/Tickets

Setup /Access

Yes

Setup /Access

Setup Failure Cause?

Capacity Optimisation

BTS/TRANS/FROZBS

UL/DL Interference (DL codes)

AC

TroubleshootingRNC

RF Optimisation

Top (N) RRC Setup and Access failures

Top (N) RAB Setup and Access failures

Coverage/ Interference

setup

setup

Interference

Coverage

3G cell at inter-RNC border ?

SRNS Relocation troubleshooting

Yes

NO

Access

Access


RRC Part Performance – Signaling and Trigger points positive

[RACH] RRC:RRC Connection

Request

UE Node B RNC

ALCAP:ERQ

NBAP: RL Setup Request

[DCH] RRC: RRC Connection Setup Complete

L1 Synchronisation

Start

TX/RX

Start TX/RX

[FACH] RRC: RRC Connection

Setup

NBAP: RL Setup

Response

AC to check to accept or reject RRC

Connection Request

ALCAP:ECF

NBAP: Synchronisation Indication

RRC Connection Setup phase

RRC Connection Access phase

RRC Connection Active

phase

Allocation of UTRAN

resources

Waiting for UE reply

RRC active complete Pre-Emption

SRNS Relocation

drop

M1001C0

M1001C1

M1001C8


RRC Part Connection Setup & Access and Active negative

BTS UE RNC CN

RRC: RRC connection Request

RRC: RRC connection Setup

RRC SETUP phase

(Resource Reservation in RNC, BTS,

Transport)

RRC ACCESS phase

(RNC waits for Reply from UE)

RRC: RRC connection Setup Complete

RR

C S

etu

p tim

e

RRC: Initial Direct Transfer

RANAP: Initial UE Message

RANAP: Iu Release Command

UE-CN Signalling

(E.g. RAB Establishment and Release)

RRC: RRC connection Release

RRC: RRC connection Release Complete

Release RRC resources in RNC, BTS,

Transport

RRC ACTIVE phase

RRC ACCESS fails if the UE does not reply to RRC: RRC

CONNECTION SETUP message with the RRC: RRC CONNECTION

SETUP COMPLETE message in given time, if the BTS reports a radio

link synchronisation failure or in an RNC internal failure occurs

RRC SETUP fails if some of the needed resources (RNC, BTS, AIR,

Transport) are not available. When an RRC setup failure occurs the

RNC sends an RRC: RRC CONNECTION REJECT message to UE

RRC ACTIVE fails when an interface related (Iu, Iur , Iub, or Radio) or

RNC internal failure occurs, and the failure causes the release of the

RRC Connection. When an RRC active failure occurs, the RRC send a

RANAP: IU RELEASE REQUEST to all involved CNs and waits for

RANAP: IU RELEASE COMMAND message (s)

RRC ACTIVE release cause can be either ISHO,

IFHO, SRSN relocation or pre-emption

11 © Nokia Siemens Networks

RRC SETUP PHASE --

DNO Optimization Processes / JC Ejarque


RAB SETUP PHASE


13 © Nokia Siemens Networks RANOP2_M1/January 2011

UE RRC: Connection Request

RRC: RRC Connection Request Setup

RRC: RRC Connection Completed

RRC: Initial Direct Transfer cm service request

RANAP: Initial UE Message

DIRECT TRANSFER (Call Proceeding)

RANAP: RAB Assignment

Request

RRC: Radio Bearer Set-up

RRC: Radio Bearer Setup Complete

RANAP: RAB Assignment Response DIRECT TRANSFER (Alerting)

BTS RNC CN

DIRECT TRANSFER (Connect)

DIRECT TRANSFER (Connect Acknowledge)

RAB Connection Access phase RNC waits reply from UE

Call Set-

up

Success

Rate Call Set-

up Time

Definition of Call Set-Up Success Rate (CSSR)

RRC Connection Access phase RNC waits reply from UE

RRC Connection Setup phase Resource Reservation in RNC, BTS, Transmission

RAB Connection Setup phase Resource Reservation in RNC, BTS, Transmission

For Internal Use Only


Failure analysis for low CSSR/SSSR cells

RRC, RAB Setup, PS

Setup Failure due AC

RRC, RAB, HSPA Setup

Performance KPI/counters

Follow-Up Yes

No

Air Interface

RRC, RAB Setup, PS

Setup Failure due

BTS

Yes

No

BTS

RRC, RAB Setup, PS

Setup Failure due Iub

Yes

No

Iub

RRC, RAB Setup, PS Setup

Failure due RNC, DMCU

Yes RNC

RRC, RAB Setup failure due

to Frozen BTS

No

Yes High Traffic Event

RANOP2 - M2/January 2011

For Internal Use Only

15 © Nokia Siemens Networks RANOP2 - M2/January 2011

Starting criteria for setup failure analysis

RRC or RAB setup failures could be due issues related to

• Coverage or interference

• Inter RNC problem

• Capacity

• Configuration & SW issues

Capacity issues could results to the RRC/RAB setup failures related to

• BTS for Channel Element (WSP & FSM) capacity issues

• TRANS for Iub capacity issues

• AC for radio capacity issues (UL Load, DL Load and DL spreading codes)


Low in CSSR: Failure Counters-I RRC Conn Setup & Access Analysis

RRC_CONN_STP_FAIL_AC

Check UL Interference, DL Power & Code occupancy if there is need to upgrade radio

capacity

Check over shooting, cell availability of own and target site , Special Events High

Traffic , Missing Neighbour

Check the alarms for the serving Node B and Neighboring sites in order to identify any

hardware faults

RRC_CONN_STP_FAIL_BTS

Evaluate NBAP counters (radio link reconf. Failures) and KPIs for troubleshooting BTS

resources

Check BTS configuration in terms of CE allocation –

Check the Available CE in comparison with CE utilization( Module might be down )

Expand the Capacity or decrease the traffic offered to the site until the problem is

solved

In case BTS is not responding delete and re-create COCO

Upgrade the Module to FSME :MAX CE element


Low in CSSR: Failure Counters-II


RRC_CONN_STP_FAIL_RNC Typically RNC fault or Incoming SRNC Relocation Failure (inter-RNC border)

Required ICSU log tracing if no RNC fault or SRNC relocation problem

Communicate the problem to Care department

CHECK alarm –BFD Alarm if exist

DMPG problem in RNC

RRC_CONN_STP_FAIL_TRANS Evaluate Number of reconfiguration failure due the transmission

Check COCO Configuration

Cross check PCR value & verify AAL2 Connection failure .

Expand the capacity or decrease the traffic offered to the site until the problem is solved For IP based Iub Check IP based route parameters Delete and Recreate the COCO : Reset the Site if sleeping cells alarm exist . Temporary decrease the Traffic or shift to GSM if the problem continuous exist with

High Failure

RRC_CONN_STP_FAIL_IUB_AAL2_TRANS

Updated when there is shortage or blocking of AAL2 resource

Cross check the PCR value & change as per Recommendation

Cross check the Transmission Alarms .

Reduce the Traffic or shift to GSM if the problem persist continuous with high failures .


RRC Conn Setup & Access Analysis

If RRC setup/access failure due to Radio/MS, it is also possible to check whether UE s are located

at distance area or close to cell edge area

Propagate delay counters from RRC measurement M1006C128-C148 reports call setup

distance during RRC connection request or cell update

This give hints that either cells has large coverage area (tall sites with over-shooting) or non-

optimum cell coverage from neighbouring cells

0

100000

200000

300000

400000

500000

600000

PRACH_D

ELA

Y_C

LASS_0

PRACH_D

ELA

Y_C

LASS_1

PRACH_D

ELA

Y_C

LASS_2

PRACH_D

ELA

Y_C

LASS_3

PRACH_D

ELA

Y_C

LASS_4

PRACH_D

ELA

Y_C

LASS_5

PRACH_D

ELA

Y_C

LASS_6

PRACH_D

ELA

Y_C

LASS_7

PRACH_D

ELA

Y_C

LASS_8

PRACH_D

ELA

Y_C

LASS_9

PRACH_D

ELA

Y_C

LASS_1

0

PRACH_D

ELA

Y_C

LASS_1

1

PRACH_D

ELA

Y_C

LASS_1

2

PRACH_D

ELA

Y_C

LASS_1

3

PRACH_D

ELA

Y_C

LASS_1

4

PRACH_D

ELA

Y_C

LASS_1

5

PRACH_D

ELA

Y_C

LASS_1

6

PRACH_D

ELA

Y_C

LASS_1

7

PRACH_D

ELA

Y_C

LASS_1

8

PRACH_D

ELA

Y_C

LASS_1

9

PRACH_D

ELA

Y_C

LASS_2

0

0.00%

20.00%

40.00%

60.00%

80.00%

100.00%

120.00%

average

CDF

Low in CSSR: Additional counters


Low in CSSR: Failure Counters

RAB setup & Access Fail Root Cause Analysis: RT and NRT (I/B) domains

RAB_STP_FAIL_XXX_AC

Check UL Interference, DL Power & Code occupancy if there is need to upgrade radio

capacity using the already distributed.

Check PrxTarget / PrxOffset / PrxMeasFilterCoeff – PtxTarget / PtxOffset /

PtxMeasFilterCoeff of the affected cells

RAB_STP_FAIL_XXX_BTS

Evaluate NBAP counters (radio link reconf. Add failures) and KPIs for troubleshooting BTS

resources

Check BTS configuration in terms of CE allocation – Use Channel Element (5001) Counters

in order to evaluate lack of Channel Elements

Expand the Capacity or decrease the traffic offered to the site until the problem is solved.

In case BTS is not responding delete and re-create COCO

RAB_STP_FAIL_XXX_TRANS

Evaluate Number of reconfiguration failure due the transmission

Check M1005C128 CANC_ADD_SRNC_TRAN_STP_FAIL

Check RAB_STP_FAIL_XXX_IUB_AAL2, M1001C531-C533

Check COCO Configuration

check IUB Capacity

RAB_STP_FAIL_XXX_RNC

Typically RNC fault or Incoming SRNC Relocation Failure (inter-RNC border)


Communicate the problem to Care department


Low in CSSR: Failure Counters

RAB setup & Access Fail Root Cause Analysis: RT and NRT (I/B) domains

RAB_ACC_FAIL_XXX_UE

Evaluate Cell resource Prx and Ptx parameters (same as RAB_STP_FAIL_XXX_AC Case)

RAB_ACC_FAIL_XXX_RNC

Typically RNC fault or Incoming SRNC Relocation Failure (inter-RNC border)


Communicate the problem to Care department.


RRC CONN STP FAIL AC



RRC_CONN_STP_FAIL_BTS



RRC CONN STP FAIL _ TRANS



RRC CONN STP FAIL TRANS



RRC CONN STP FAIL _RNC


BFD

ALARM


RRC CONN STP FAIL FROZBS



FINAL IMP COUNTER



CRITICAL & MAJOR WCDMA ALARMS-I •

• Base Station generated alarms from HW problems:

• 61022 BFD down, 10.68.18.241

• 61605 BFD 1 down, ingress, 10.68.18.241 to 10.68.121.9

•

• 3117-- FAILURE IN SAAL UNI SIGNALLING LINK ACTIVATION

•

• 1.7650 BASE STATION FAULTY

• A critical fault has occurred in the Base Station. None the cells of this Base Station are capable of transmitting traffic and thus also HSDPA is unavailable in this Base Station.

• 2.7651 BASE STATION OPERATION DEGRADED

• A major fault (or faults) has occurred in the Base Station. Depending on the fault details this alarm may indicate problems with HSDPA (see also alarm 7776 below).

• 3.7653 CELL FAULTY

• Hardware fault in Base Station has an effect for a Cell. The Cell is unavailable for all traffic.

• 4.7654 CELL OPERATION DEGRADED

• Hardware fault in Base Station has an effect for a Cell. Depending on the fault details this alarm may indicate problems with HSDPA (see also alarm 7776 below).

• 5. 7772 PHYSICAL SHARED CHANNEL CONFIGURATION FAILED

• HSDPA channel configuration or reconfiguration to Base Station has failed. HSDPA is not available in given Cell.

•

•



CRITICAL & MAJOR WCDMA ALARMS-II

• 6. 7776 HSDPA FAILURE IN WCEL

• Base Station has informed RNC that it cannot provide HSDPA. The reason for the fault is either a hardware failure or a lack of capacity in Base Station. See Base Station generated alarms for fault details.

• . 7665 BASE STATION TRANSMISSION ALARM

• 10. 61058 Synchronization lost

• 11. 7650 BASE STATION FAULTY

• 12.7651 BASE STATION OPERATION DEGRADED

• . There is no limit to how many 7651 alarms can be active at the same time

• 13. 7652 BASE STATION NOTIFICATION

• . There is no limit to how many 7652 alarms can be active at the same time

• 14. 7653 CELL FAULTY

• . Start, the affected cell state is set disabled

• . Cancel, the affected cell state is set enabled

• 15. 7654 CELL OPERATION DEGRADED

• . There is no limit to how many 7654 alarms can be active at the same tim

•

• 19. 7661 BASE STATION LICENCE NOTIFICATION

• . Licence alarms do not have dependencies to other BTS alarms.

•

•

•



CRITICAL & MAJOR WCDMA ALARMS-III


16. 7655 CELL NOTIFICATION

. There is no limit to how many 7655 alarms can be active at the same

time

17. 7665 BASE STATION TRANSMISSION ALARM

. In case of faulty transmission equipment or transmission software, this

alarm is

reported towards the OMS or NetAct.

. Transmission alarms do not have dependencies to other BTS alarms.

18. 7660 BASE STATION LICENCE EXPIRED

. Licence alarms do not have dependencies to other BTS alarms.


Thank you


Accessiblity Cs Voice Analysis. Finalppt

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