9 KPI Analysis

HUAWEI TECHNOLOGIES CO., LTD.

www.huawei.com

Huawei Confidential

Security Level:

UTRAN KPI Analysis

HISILICON SEMICONDUCTORHUAWEI TECHNOLOGIES CO., LTD. Page 2Page 2

Overview

•Introduction

•UTRAN KPIs

•Summary


Introduction


Introduction : KPIs- KPIs are mainly used to evaluate network quality

- KPIs

Core Network

UTRAN


Network

BAM

GENEX Nastar WCDMA

Optimization Result

Data Collection

- Client version: It can be used flexibly in the network to meet the engineer’s personal demand for network optimization.

- Server version: A regional monitoring center, which can be used by every branch in this region.

Introduction : Nastar


The Nastar WCDMA is a powerful tool that offer the

possibility to analyze network performance through :

Performance Query TOP N QueryPerformance Report

Introduction : Nastar


UTRAN KPIs


UTRAN KPIs

Call SetupCall DropCongestionHandover Traffic


UTRAN KPIs : Call Setup• Formula of Call Setup Success Rate:

Call Setup Success Rate = RRCSetupSuccRate × RABSetupSuccRate ×100%

• Can be classified by : Service (CS&PS) QoS (Conversational/Streaming/Interactive /Background)


UE SRNC

RRC RRC

RRC

RRC

RRC

RRCRRC Connection Setup Complete

NODEB

NBAP NBAP

NBAP NBAP

Radio Link Setup Requset

Radio Link Setup Response

RRC Connection Request

RRC Connection Setup

UTRAN KPIs : RRC Setup Success Rate


UTRAN KPIs : RRC Setup Success Rate• The formula of RRC Setup Success Rate: RRC Setup Success Rate = RRC Connection Setup Success / RRC Connection

Request × 100%

• RRC Setup Reject Causes: – Congestion (Codes, Power, CE)– Unspecified (transmission or NodeB problem)

• Other RRC Setup failure reason– UE can’t receive RRC CONNECTION SETUP – NodeB can’t receive RRC CONNECTION SETUP COMPLETE


UE SRNCNodeB CN

RANAP RANAPRAB Assignment Request

RRCRRC

RRC

RB Setup

RRCRB Setup Complete

RANAP RANAPRAB Assignment Response

NBAP NBAPRL Reconfig Prepare

NBAP NBAP

NBAP NBAP

RL Reconfig Ready

RL Reconfig Commit

UTRAN KPIs : RAB Setup Success Rate


• The formula of RAB Setup Success Rate:RAB Setup Success Rate = RAB Assignment Success / RAB

Assignment Request × 100%

• RAB Setup Failure Causes: - Non supported UTRAN capabilities - Relocation triggered - Transport connection failed to establish - Unavailable resources - Other (RB Setup…)

UTRAN KPIs : RAB Setup Success Rate


UTRAN KPIs : RB Setup Success Rate

• RB Setup Failure Causes: - Unsupported or invalid configuration

- Cell Update

- Incompatible simultaneous services

- Unavailable resources

- No Response

- Other


UTRAN KPIs



UTRAN KPIs : Call Drop Rate After RAB is setup successfully, Iu release command is sent by CN due to Iu release request or RAB

release request from RNC. And the corresponding reasons are not:• Successful Relocation • User Inactivity• Normal Release


• Call Drop Rate (RNC)

– Formula

– Measurement scope RNC

– Description This KPI can be used to evaluate the call drop ratio of different services in one RNC. The call drops will happen

due to RNC abnormal release trigged by RAB RELEASE REQUEST or IU RELEASE REQUEST messages

%100Re_ ssSetupSucceServiceRABleaseAbnormalServiceRABCDRService

UTRAN KPIs : RNC Call Drop Rate


UTRAN KPIs : CS Call Drop Rate• Based on QoS: Conversational & Streaming

• Based on Services: AMR & CS64K

• Based abnormal reasons:

– RF Problem

– UE Signaling Connection Release

– OM intervention

– Iu interface AAL2 link abnormity

– Others reasons (cell update failure, congestion.....)


UTRAN KPIs : PS Call Drop Rate• Based on QoS: Conversational, Streaming, Interactive & background

• Based on Services: PS64 , PS128, PS384, HSDPA

• Based abnormal reasons:

– RF Problem

– UE Signaling/Traffic Connection Release

– OM intervention

– Iu interface AAL2 abnormity

– Others reasons (cell update failure, congestion.....)


UTRAN KPIs : Cell Call Drop Rate

– Reasons:• RF Problem• UE Signaling Connection Release • UTRAN Problem• OM intervention • Iu interface AAL2 link abnormity• RAB preemption• Others reasons (cell update failure, congestion.....)

– Formula

– DescriptionThis KPI can be used to evaluate the call drop ratio of different services in one cell.

%100Re

Re_ leaseServiceRAB

leaseAbnormalServiceRABCDRService


UTRAN KPIs



• The formula of Signaling Congestion Rate:Signaling Congestion Rate = RRC Connection Reject (Cause: congestion) / RRC

Connection Request × 100%

UE RNCNodeB

RRC RRCRRC Connection Request

RRC RRC Connection Reject (Cause : Congestion) RRC

UTRAN KPIs : Signalling Congestion Rate


UTRAN KPIs : Traffic Congestion Rate

• Traffic Congestion Rate is calculated by counting the RAB Assignment Setup Failure (cause: congestion).

• Can be divided into two parts: CS&PS

SRNC CN

RANAP RANAPRAB Assignment Request

RANAP RANAPRAB Assignment Response (Failure cause: Congestion)


UTRAN KPIs : Traffic Congestion Rate

• The formula of CS Traffic Congestion Rate:

CS Traffic Congestion Rate = CS Domain RAB Assignment Setup Failure (Congestion) / CS Domain RAB Assignment Setup Request × 100%

• The formula of PS Traffic Congestion Rate:

PS Traffic Congestion Rate = PS Domain RAB Assignment Setup Failure (Congestion) / PS Domain RAB Assignment Setup Request × 100%


UTRAN KPIs



• The formula of Soft (Softer) Handover Success Rate:

Soft (Softer) Handover Success Rate = Soft (Softer) Handover Success / Soft (Softer) Handover Request× 100%

UTRAN KPIs : Soft (Softer) Handover Success Rate


UE New NodeB SRNC

NBAP NBAP

NBAP NBAP

RRC RRC

RRCRRC DCCH : Active Set Update Complete

Radio Link Addition Request

DCCH : Active Set Update

Radio Link Addition Response




• Main reasons of Soft (Softer) Handover Failure are :

- Unsupported configuration

- Invalid Configuration

- Incompatible simultaneous reconfiguration

- No Response

- Other Reasons


• The formula of Hard Handover Success Rate:

Hard Handover Success Rate = Hard Handover Success / Hard Handover request× 100%

UTRAN KPIs : Hard Handover Success Rate



UE Target NodeBSource NodeB SRNC

RRC

NBAPNBAP Radio Link Setup Request

NBAP NBAPRadio Link Setup Reponse

RRCDCCH : Physical Channel Reconfiguration

NBAPNBAP Radio Link Failure Indication

RRC RRCDCCH : Physical Channel Reconfiguration Complete

NBAP NBAPRadio Link Deletion Request

NBAP NBAPRadio Link Delete Response



• Main reasons of Hard Handover Failure are :

-Unsupported configuration

-Invalid Configuration

-Physical Channel Failure

-Incompatible simultaneous reconfiguration

-No Response

-Other Reasons (Core Network....)


UTRAN KPIs : Inter-RAT Handover Success Rate

• The formula of InterRAT Handover to GSM Success Rate:

InterRAT Handover to GSM Success Rate = inter-RAT handover from UTRAN to GSM success / inter-RAT handover from UTRAN to GSM attempts × 100%


UTRAN KPIs : Inter-RAT Handover Success RateUE NodeB RNC

NBAP NBAP

NBAP NBAP

RRC RRC

Handover Complete

Radio Link Deletion Request

Handover From Utran Command

Radio Link Deletion Response

3G MSC 2G MSC BSS

RANAP RANAPRelocation Required

RANAP RANAPRelocation Command

RANAP RANAPIu Release Command

RANAP RANAPIu Release Complete

Prepare Handover

Handover Request

Handover Request Ack

Prepare Handover Response



• Main reasons of Inter-RAT Handover Failure are :- Configuration Unacceptable

- Physical Channel Failure

- No Response

- Wrong 2G information execution

• Main reasons of Inter-RAT Handover Prepare Failure are :-Wrong 2G LAC declaration (UTRAN/CN)

-2G BSS Configuration

-Core Network Problem


UE NodeB RNC

RRC RRC

RRC Handover From Utran Failure

Handover From Utran Command

3G MSC 2G MSC BSS

RANAP RANAPRelocation Required

RANAP RANAPRelocation Command

Prepare Handover

Handover Request

Handover Request Ack

Prepare Handover Response

RRC


Need optimize 3G-2G neighbors and configuration (RNC&CN), 3G-2G handover parameters for example: Report

interval/GSM RSSI threshold/ Hysteresis.


UTRAN KPIs



• CS Traffic for two types of QoS:– CS Conversational Traffic (voice and video)– CS Streaming Traffic (streaming video or audio)

• CS Traffic for two types of Service:– CS AMR Traffic (Voice)– CS 64k Traffic (Video Phone)

UTRAN KPIs : Traffic


UTRAN KPIs : Traffic• PS Traffic for four types of QoS:

– PS Conversational Traffic– PS Streaming Traffic– Interactive Traffic– Background Traffic

• PS Traffic for different services :– PS 64k– PS128k– PS384k– HSDPA


Summary


Summary (1/3)KPI Stage Failure Cause Types

Call Setup Success Rate

RRC Setup Success Rate

- Congestion - Unspecified - RF

RAB Setup Success Rate

- Non supported UTRAN capabilities - Relocation triggered - Transport connection failed to establish - Unavailable resources - Other

CN domain: - CS- PSQoS Classes:- Conversational- Streaming- Interactive- Background

Call Drop Rate

CS

- OM intervention - RF Problem -Iu Interface - UE generated signaling connection release - Other

PS

- OM intervention- RF Problem-Iu Interface- UE generated signaling/traffic connection release- Other

Congestion Rate Signaling Congestion Rate RRC Connection Reject (Cause: congestion) 　Traffic Congestion Rate RAB Assignment Setup Failure (cause: congestion). - CS

- PS


KPI Stage Failure Cause Types

Soft & Softer Handover Success

Rate

Radio Link Addition

- Configuration unsupported - Incompatible simultaneous reconfiguration - - Invalid configuration - No response from UE - Other

　Radio Link Deletion

Hard Handover Success Rate 　

- Configuration unsupported - Physical channel failure - Incompatible simultaneous reconfiguration - Cell update occurred - Invalid configuration - No response received from UE

　

InterRAT Handover to GSM Success Rate

Prepare

Execution　

- Wrong 2GLAC Declaration - 2G BSS configuration - Core Network Problem

- Configuration unacceptable - Physical channel failure - wrong 2G information - InterRAT handover to GSM no response

　

Summary (2/3)


KPI Stage Failure Cause Types

CS Traffic Erlang 　QoS Classes:- Conversational- StreamingBears- AMR Voice- CS 64K

PS Traffic Erlang 　QoS Classes:- Conversational- Streaming- Interactive- Background

PS Throughput Byte 　QoS Classes:- Conversational- Streaming- Interactive- Background

Summary (3/3)


Thank you !

Documents

9 KPI Analysis