UMTS KPI optimization

Capacity Audit

CELL NODE-B RNC

CELL

NODE-B

RNC

User Experience ： Average Throughput of per userCode Resource ： R99 / HSPA , Reject for code limitPower Resource ： TCP / RTWP , Reject for power limit

CE Resource / Number of sites / CPU Load

CE Resource / IUB Transmission ResourceNumber of Online Users

3

•DT/CQT Test and Analysis

•KPI Monitoring and Analysis

•TopN Cells Optimization

•Complaints Handling

•Holiday and Important Event

•VIP Subscriber Care

Routine Network Optimization Services

4

•Neighbor Cells Optimization

•LAC Area Optimization

•Resource Utilization Optimization

•Packet Service Optimization

•2G/3G Inter-operation Optimization

•Vip Area Optimization

Network Performance Improvement Services

5

•KPI Monitoring and Analysis

Routine Network Optimization Services

–RNC and cell's traffic

–Call setup success rate

–Call drop rate

–Call blocking rate

–Handover success rate

OMC Daily

Monitoring

KPI Real-time

Tracking

Hardware

Software IssueAbnormal

AnalysisRF Issue

Parameter

Issue

Cell breathing is one of the means for load control

The purpose of cell breathing is to share the load of hot-spot cell with the light loaded neighbor cells, therefore to improve the utilization of system capacity.

The purpose of cell breathing is to share the load of hot-spot cell with the light loaded neighbor cells, therefore to improve the utilization of system capacity.

Cell Breathing Effect

Capacity of UMTS

UL capacity is restrained by

interference

DL capacity is restrained

by the power of NodeB

Different service has different capacity

Soft Capacity

Quality

Coverage

Capacity

All the key technologies adopted are used to try to achieve the optimal balance of the three factors

All the key technologies adopted are used to try to achieve the optimal balance of the three factors

Crucial Factors for UMTS Network

Coverage/capacity VS Data Rate

• Higher data rate needs higher power• High data rate transmission is only available nearby the

station

>12.2 kbps

>64 kbps

>384 kbps

>144 kbps

Coverage decrease

Subscriber num increase

KPI Overview

Driver Test

Coverage Class Mobility Class

RNC Soft Handover Success Ratio Inter-Frequency Hard Handover Success Ratio Intersystem Hard Handover Success Ratio (CS domain and PS domain) …

QoS Class

RRC Connection Setup Success Ratio RAB Setup Success Ratio Call Setup Success Ratio Drop Call RatioAverage UL/DL Throughput…

Resource Usage Class Trouble Cell Ratio Busy Cell Ratio…

Capacity Class

NodeB/RNC Capacity PS Capacity Cell UL Load rate Block Call Ratio …

KPI

RRC: Radio Resource Control RAB:Radio Access Bearer

Single station check

Base station group optimization

Whole network optimization

Satisfy the indexes or not?

Find out base station group that do not satisfy requirements

No

Common RF Optimization Process

Single Station Check• Confirm site information

– Longitude and latitude, configuration, height above sea level, and so on.• Confirm antenna feeder information

– Antenna type, azimuth, down-tile angle and height.• Check antenna feeder link• Confirm system parameters

– List of adjacent areas, overhead channel transmitting power, configuration, switching parameters.

• Check and test basic functions– Basic call process, soft switching, softer switching.

• Check station coverage

Base Station Group Optimization

• Load-free test• Load test

Whole Network Optimization

• Driver test• Analysis on test results• Confirm whole network adjustment scheme

Performance Test Indexes

• Voice quality• Call connection rate (call completion rate and paging response

rate)• Resource utilization—CPU utilization• handover completion rate• Call drop rate• Network coverage

Common RF Problems

• Call Drop• Access Failure

Call Drop AnalysisImprove the coverage of the points.Configuration of list of adjacent areas is not complete.

• Interference• Pilot pollution is serious• Faults with base stations

– Incorrect connection of antenna feeders, interruption of transmission and so on.

• Hard switching takes place

Access Failure

• Interference(RTWP>-95)• Network Capacity • Coverage over weak areas, blind zones or pilot pollution areas• Mobile phone performance

Major 3G KPIs

KPI Category KPI Name

Accessibility(%)

RRC Setup Success Ratio

RAB Setup Success Ratio

CS RAB Setup Success Ratio

PS RAB Setup Success Ratio

Retain ability (%)

CS Service Drop Ratio

PS Call Drop Ratio

HSDPA Call Drop Ratio

Soft Handover Success Ratio

Interoperability(%) CS W2G Inter-RAT Handover Out Success Ratio

3G Dual Carrier Discussion

Dual Carrier Implementation Policy

F 2

F1

SHO

HHO

random camping

R99+H R99+H

R99+H R99+H R99+H R99+H

DC-HSPA+ Discussion

3GPP required: DC-HSPA+ max TBZ is 42192.From testbed test result we can see ZTE***project equipment support Max DC TBZ 42192.

DC-HSPA+ Discussion

In ShenZhen ZTE R&D laboratory room can reach 40.68Mbps