HSDPA Planning

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Network Planning for UMTS and HSDPA

Motorola Networks

Jonathan KromerWireless Broadband Group 9th April 2005



Agenda

Motorola Planning Services and Tools

UMTS & HSDPA Planning Issues

HSDPA Cell Coverage and Capacity

Equipment Dimensioning



Motorola Services

RAN Design & Planning

Dimensioning (Capacity, Coverage, Traffic Mix)

RF Planning Simulation & Optimization

End-to-End Network Performance Modelling

Benchmarking End-user Application

Optimization network performances (delay, throughput)

Dimensioning Transmission links



Radio Planning ToolsNetPlan: RF Prediction

Radioplan: Optimisation and HSDPA Simulation

NetPlanNetPlanRF PredictionRF Prediction

OptimizationOptimization& HSDPA& HSDPA

Motorola Services




Analyze the influence of parameters such as:

CQI (UE channel quality indicator) reporting period

HSDPA scheduler

number of available HS-DSCH codes per cell

number of available HS-SCCH per cell

cell HSDPA power mode (PCPICH offset or residual power)

HS-PDSCH on first or second ordinary code tree

exclusive use of carrier for HS-DSCH

UE HSDPA category

RF Planning




UE Performance Analysis

Key Features

Average_CQI_Num: The average CQI value of this UE, averaged over all subframes.

Instantaneous_HSDPA_Throughput_kbps: The highest instantaneous throughput of this UE on the HSDPA.

Average_HSDPA_Throughput_kbps: The average HSDPA throughput of this UE, averaged over all subframes.

Active_HSDPA_Subframes_%: The ratio of subframes in which this UE was scheduled to all simulated HSDPA subframes.

V2000 HSDPA Capable

RF Planning

source: Radioplan Platform WiNes




Cell Performance Analysis

Key Features

Average_Total_HSDPA_Throughput_kbps: The average total throughput of this cell on the HSDPA, averaged over all subframes.

Peak_Total_HSDPA_Throughput_kbps: The highest instantaneous throughput of this cell on the HSDPA.

Average_HS_SCCH_Num: The average number of HS-SCCH, averaged over all subframes.

RF Planning

source: Radioplan’s Platform WiNes



Optimizing HSDPA Applications

UE Node BRNC

SGSNGGSNOMC

Complete End-to-End Modelling to assess Application Performance: Determining maximum capacity for given configurations. Dimensioning of interfaces Evaluation of “what-if” scenarios. Impact of new product features/Applications Capacity growth planning Multi-vendor

source: Motorola End-to-End simulator

Motorola Services



HSDPA Network Performance

User Throughput= Average User Packet Call Throughput

Signalling load at each interface

Packet Call Delay = initial request to UE reception of data,

modeling of:Call setup delayUser data buffering in UTRAN prior to schedulingRe-transmission delaysCore network delays

E2E Modeling



HSDPA OptimizationIP Bottleneck Identification

E2E Modeling



HSDPA simulation tool

By end Q2 2005 - complete phase 1 of high level planning tool to be used by customer facing teams

Simplified tool to estimate cell range and capacities

Inputs of subscribers, traffic, coverage requirements

Outputs of cell requirements, cell loading, throughput ….

Tool for customer defined planning tasks for HSDPA



UMTS Network Planning Overview

HSDPA designed as overlay to existing UMTS network

Voice and data servicesVoice and data users load the system differentlyAsymmetric uplink and downlinkDelay tolerant packet data

Variable Cell CapacityCapacity of a cell is highly dependant upon RF conditionsSoft blockingInterference / noise rise limited systemCapacity should not be limited by equipment

Varying Cell RangeDifferent cell range for Uplink and DownlinkSoft handover between cellsCoverage dependant on bearer rateCell shrinkage as loading increases



Node B scheduler

Attempts to schedule users during “constructive fades”

downlink channel quality (CQI) reported by mobilelow latency required - scheduler located in node B

I

Time

DL

Qu

alit

y

Scheduler decision

2ms

User 1User 2User 3User 4

Reduced fade margins required in link budget



Soft Handover

Soft handover produces gain in UMTS performance

HSDPA – soft handover not used on HS_DSCH

Mobility still present but hard handover by cell reselection



Downlink Shared Channel

HS-DSCH channel provides transport channel for all users

User data scheduled onto shared channel by Node B

Maximum of up to 4 users per 2ms timeslot

Maximum of 15 OVSF codes per sector for HSDPA



Receiver performance

HSDPAcodes bit rate Eb/(No+Ioc)

1 68,500 2.61 194,500 3.65 969,500 3.65 1,815,000 5.0

5 2,417,000 6.0

5 3,649,000 8.1

10 7,205,500 8.0

15 10,125,500 7.6

Estimates of HSDPA performance from link level simulation

Typically estimate 1-3dB implementation margin as rate increases



Cell Range / Service Coverage

Cell Range dependant upon:

Data rate

Cell loading

Noise rise

Quality of service

Range limits

UL limited at low load

DL limited at high load

32kbps

64kbps

384kbps

range

loadHSDPA



Cell Range

** HSDPA coverage overlay on existing UMTS cells **

Testing and Simulations compare HSDPA to UMTS

Typical UMTS coverage is 64k UL and 128k DL

HSDPA supports over 2Mbit/s over same coverage area

Optimisation of HSDPA – capacity, QoS, delay



HSDPA AREA COVERAGE IN A UMTS CELL

R=1060m, Prob.=95.7%

224K < x < 256Kx > 256K

96K < x < 128K128K < x < 160K160K < x < 192K192K < x < 224K

x < 16K16K < x < 32K32K < x < 64K64K < x < 96K

HTTP (TCP)

100ue/sector

3km/h VA, PB

5 Codes

R=475m, Prob.=95.1%

Rake Single Antenna Equaliser



Cell Capacity

Cell capacity limited by downlink power

Typical UMTS cell capacity – simultaneous connections 50 voice users 9 data connections at 128k or 3 connections at 384k Max. data throughput approx 1Mbit/s

Average HSDPA throughput approx 2-3Mbit/s Peak instantaneous throughput of 14.4Mbit/s



HSDPA throughput (Web browsing) (typical sample simulation results)

0

500

1000

1500

2000

2500

50 75 100 125 150

Offered Load (UE/sector)

Kb

ps

Sector Throughput User Throughput



Delay - Web browsing Simulation

0

0.2

0.4

0.6

0.8

1

1.2

Packet Call Delay (second)

CD

F

50 UE/sector

75 UE/sector

100 UE/sector

125 UE/sector

150 UE/sector

Eg. With 50 UE’s per sector 80% of users download the whole web page within 2.5 seconds



Impact of Handset Receiver Type

25 50 75 100 125 1500

500

1000

1500

2000

2500

3000

Offered Load (UE/sector)

Thr

ough

put

(kbp

s)

25 50 75 100 125 1500

2

4

6

Out

age

(%)

15/5 Codes, 0.5/0.5 PB/VA (3 km/h), CDM=4, ETSI HTTP, IR

Sector Throughput

User Throughput

Outage

MMSE Equalizer

RAKE Receiver

Cell capacity increased dramatically by equalizer compared to single rake receiver



Varying HSDPA power reservation

Average cell throughput with 5 HSDPA codesUp to 25% of LPA power allocated to HSDPA



Varying HSDPA power reservation

Increasing HSDPA power allocationWith 15 HSDPA codes allocated

Cell throughput vs HSDPA Power

0.00

0.10

0.20

0.30

0.40

0.50

0.60

0.70

0.80

0.90

0 500 1000 1500 2000 2500 3000

Cell throughput (kbit/s)

HS

DP

A %

po

we

r



Node B EquipmentUMTS Carrier Considerations

(i) 1/1/1 with 20W per cell with R99 and HSDPA mixed on same carrier. Minimum expenditure for initial HSDPA Coverage solution and medium capacity

(ii) High capacity - HSDPA on second carrier. Allows all 15 HSDPA codes permanently allocated

(iii) High capacity 2/2/2 with R99 and HSDPA on both carriers.

(iv) HSDPA deployed as high capacity microcellular overlay solution for hot spot areas only

(v) HSDPA deployed in-building solution.



Node B Dimensioning: Wideband Digital Modem (WDM) HSDPA support

• Current Node B hardware is HSDPA ready

• USR3 software upgrade required for HSDPA

• Additional WDM card required to support HSDPA at USR3

• HSDPA and R99 on same WDM with USR4 Software



Node B HSDPA support

USR3

Motorola supports maximum of 5 HSDPA codesFixed Spreading Factor of 16 for each codeHSDPA reserved power is staticOVSF code reservation is static

Node B supports one WDM for HSDPA traffic60 HSDPA users are supported per siteMaximum HSDPA throughput 10.6 Mbit/s



Node B dimensioning at USR3

A 1/1/1 Node B must have minimum of 2 WDM Modem cards

(i) One Modem is configured for HSDPA

Downlink: 128 channels are available5 * 2 HS-DSCH channel elements required per cell1 HS-SCCH channel per cell 95 channels remain after HS-DSCH and HS-SCCH

60 HSDPA users (max.) supported at USR3

Uplink: 60 HS-DPCCH required

Throughput: 10.8 Mbps/3 3.6 Mbps average for 1/1/1 site



Node B dimensioning at USR3

A 1/1/1 Node B must have minimum of 2 WDM Modem cards

(ii) Second Modem is configured for R99 traffic

Downlink: 128 R99 channels are available15 channels required for R99 CCCH60 channels required for DCH for HSDPA users 53 channels remain for R99 connections

Uplink: 53 channels also available in uplink

Throughput: Approximately 2304 kbit/s or equivalent of 6 * 384k

Summary : 60 HSDPA users, with 53 additional R99 users.



Node B HSDPA support

USR4

Motorola supports maximum of 15 HSDPA codes HSDPA reserved power is dynamic OVSF code reservation is dynamic

Node B supports six WDMs maximum All WDMS support mixed R99 and HSDPA traffic Maximum 90 HSDPA users are supported per WDM Maximum HSDPA throughput 14.4 Mbit/s per WDM Carriers may be R99, HSDPA or mixed



WDM (Modem) Parameters - UMTS

Key Parameter Value

Maximum channels supported per card 128

Reserved channels for common control channels 5 per cell minimum

Maximum number of DCH supported per card 120

Maximum UMTS Cells supported per WDM 3

Maximum kbit/s throughput – R99 traffic

1536 (USR2)

2304 (USR3)

3072 (USR4)

Maximum kbit/s throughput – HSDPA traffic10.8 Mbit/s (USR3)

14.4 Mbit/s (USR4)

Maximum number of WDM cards per cabinet 6



WDM - Number of Users Supported

Data RateNumber of Connections USR2

Number of Connections USR3

Number of Connections USR4

Voice 113 113 113

64k 24 36 48

128k 12 18 24

384k 4 6 8

HSDPA N/A 60 90



Motorola RNC5000

Switch Unit

System Unit

O&M Unit

Per System Unit Expansion :

• Capacity: • 2500 voice Erlangs• 60 Mbit/s UL & DL data throughput

• Coverage:• 300 cells per system unit (100 1/1/1 sites)

• Interfaces:• Iub - 64 E1 or 2 STM-1 per system unit

Typical Configuration with FOUR System UnitsTypical Configuration with FOUR System Units

Connection of 1200 Cells (up to 400 Node Bs)Connection of 1200 Cells (up to 400 Node Bs)

10000 Voice Erlangs (or 240Mbit/s data throughput)10000 Voice Erlangs (or 240Mbit/s data throughput)

System Unit

System Unit

System Unit



Dimensioning RNC5000 for HSDPA

Switch Unit

System Unit

O&M Unit

Dimensioning of RNC5000 is based upon 3 main factorsDimensioning of RNC5000 is based upon 3 main factors

Cells to be supported in the networkCells to be supported in the network

Traffic throughputTraffic throughput

Interfaces requiredInterfaces required

System Unit

System Unit

System Unit

Example of high level dimensioning Assume 1Mbit/s per cell average data with

HSDPA enabled

Each system unit supports 60 cells

Maximum configuration is 6 cabinets with 16 system units

Supporting 960 HSDPA cells

Supporting 320 high data 1/1/1 sites



Transmission

PS CN

CS CN

Apps

PSTNIub

Iups

Iucs

Iuu

Node B RNC5000



Transmission - Iub

Typical UMTS throughput around 1 Mbit/s per 1/1/1 SITE

With HSDPA throughput may be 1 - 2 Mbit/s per cell

Significant increase in E1 link requirement with HSDPA

Node B is capable of 8 * E1 link connections Max.

STM-1 connectivity at USR4



Transmission - Iub

RNC5000 Iub interface via E1 or STM-1

Dimensioning of HSDPA indicates STM-1 required

Motorola RNC5000 supports high capacity Iubvia STM-1 with 32 STM-1 connections available



Transmission – IuCS / IuPS

Iu connection to RNC5000 via STM-1 link to Switch Unit

64 STM-1 connections available for Iu

32 STM-1 max. connections at Iub

For HSDPA- Iub design must account for possible bottlenecks



HSDPA Planning Summary

Motorola provides HSDPA planning and Optimisation services

Internal and external tools for HSDPA analysis

UMTS Coverage designed typical for 64k UL and 128k DL

HSDPA overlaid onto UMTS system

Design considerations mainly for capacity, latency

Additional RNC Equipment and transmission required

HSDPA Planning

Documents

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