hsdpa planning
DESCRIPTION
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Network Planning for UMTS and HSDPA
Motorola Networks
Jonathan KromerWireless Broadband Group 9th April 2005
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Agenda
Motorola Planning Services and Tools
UMTS & HSDPA Planning Issues
HSDPA Cell Coverage and Capacity
Equipment Dimensioning
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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
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Radio Planning ToolsNetPlan: RF Prediction
Radioplan: Optimisation and HSDPA Simulation
NetPlanNetPlanRF PredictionRF Prediction
OptimizationOptimization& HSDPA& HSDPA
Motorola Services
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RAN Design & Planning
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
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RAN Design & 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
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RAN Design & Planning
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
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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
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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
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HSDPA OptimizationIP Bottleneck Identification
E2E Modeling
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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Varying HSDPA power reservation
Average cell throughput with 5 HSDPA codesUp to 25% of LPA power allocated to HSDPA
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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
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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.
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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
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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
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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
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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.
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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
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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
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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
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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
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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
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Transmission
PS CN
CS CN
Apps
PSTNIub
Iups
Iucs
Iuu
Node B RNC5000
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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
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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
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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
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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