9 kpi analysis
TRANSCRIPT
HUAWEI TECHNOLOGIES CO., LTD.
www.huawei.com
Huawei Confidential
Security Level:
UTRAN KPI Analysis
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Overview
•Introduction
•UTRAN KPIs
•Summary
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Introduction
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Introduction : KPIs- KPIs are mainly used to evaluate network quality
- KPIs
Core Network
UTRAN
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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
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The Nastar WCDMA is a powerful tool that offer the
possibility to analyze network performance through :
Performance Query TOP N QueryPerformance Report
Introduction : Nastar
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UTRAN KPIs
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UTRAN KPIs
Call SetupCall DropCongestionHandover Traffic
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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)
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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
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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
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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
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• 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
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UTRAN KPIs : RB Setup Success Rate
• RB Setup Failure Causes: - Unsupported or invalid configuration
- Cell Update
- Incompatible simultaneous services
- Unavailable resources
- No Response
- Other
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UTRAN KPIs
Call SetupCall DropCongestionHandover Traffic
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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
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• 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
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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.....)
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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.....)
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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
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UTRAN KPIs
Call SetupCall DropCongestionHandover Traffic
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• 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
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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)
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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%
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UTRAN KPIs
Call SetupCall DropCongestionHandover Traffic
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• 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
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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
UTRAN KPIs : Soft (Softer) Handover Success Rate
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UTRAN KPIs : Soft (Softer) Handover Success Rate
• Main reasons of Soft (Softer) Handover Failure are :
- Unsupported configuration
- Invalid Configuration
- Incompatible simultaneous reconfiguration
- No Response
- Other Reasons
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• The formula of Hard Handover Success Rate:
Hard Handover Success Rate = Hard Handover Success / Hard Handover request× 100%
UTRAN KPIs : Hard Handover Success Rate
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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
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UTRAN KPIs : Hard Handover Success Rate
• Main reasons of Hard Handover Failure are :
-Unsupported configuration
-Invalid Configuration
-Physical Channel Failure
-Incompatible simultaneous reconfiguration
-No Response
-Other Reasons (Core Network....)
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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%
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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
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UTRAN KPIs : Inter-RAT Handover Success Rate
• 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
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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
UTRAN KPIs : Inter-RAT Handover Success Rate
Need optimize 3G-2G neighbors and configuration (RNC&CN), 3G-2G handover parameters for example: Report
interval/GSM RSSI threshold/ Hysteresis.
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UTRAN KPIs
Call SetupCall DropCongestionHandover Traffic
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• 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
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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
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Summary
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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
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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)
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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)
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Thank you !