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22.09.2004 6th EMPS 2004 & 2nd ASMS 2004 1

SDMB Radio Network Planning Tool

Reiner Hoppe, Gerd Wölfle and Michel-Guy Françon, Cécile Prigent

Radio Network Planning Tool forSatellite Digital Multimedia Broadcast

22.09.2004 6th EMPS 2004 & 2nd ASMS 2004 2


� Introduction to SDMB

� Concept of SDMB Planning Tool

� Wave Propagation Modelling

� SDMB System Simulator

� Simulation Results

� Conclusions

Outline

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Introduction

SDMB System Overview� SDMB aims to provide multimedia services to the mobile user

� handset as user terminal

� SDMB relies on WCDMA air interface � compliant to 3GPP UTRA FDD

� Hybrid satellite & terrestrial infrastructure � coverage outdoor and indoor

3G handsetSDMB enabled

High power geo-stationary satellite

Terrestrial repeater

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IntroductionSDMB System Overview

� Satellite beam provides umbrella cell over all environments (urban, suburban, rural)

� Satellite signal blocked in urban street canyons and in indoor environments

� Terrestrial repeaters (IMR) as gap-fillers for urban and indoor areas

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Introduction

Why do we need a SDMB planning tool?� Trade open radio parameters of SDMB system architecture

� Satellite segment- Tx power per beam- Interbeam interference- Througput (how many channels/codes, data rates)

� Repeater (IMR) segment- Required density to achieve urban and indoor coverage- Transmitting power- Antenna configuration (sector/omni)- Processing delay

� User terminal- Rake Receiver integrated in user terminal - Number of Rake fingers- Size of Rake window

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Structure of the SDMB Planning Tool

Wave propagation modelling of the radio channels Channel

profiles

Satellite channel

Terrestrial repeater channel

SDMB system simulation

Definition ofSDMB system:

- Satellite segment- Repeater segment- User terminal segm.

Investigation ofSDMB

performance

Concept

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Concept

Structure of the SDMB Planning Tool� Integration of SDMB system simulator into ProMan (commercial planning tool),

i.e. computation of path loss delay profiles and SDMB system simulation within one program

� Specification of- Satellite segment- Repeater segment- User terminal segment

� Evaluation of SDMB performance (Eb/Nt)

� Based on prediction of pathloss delay profiles (1st part)

� SDMB system simulation (2nd part)

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Determination of the Path Loss Delay Profiles� For satellite beam and each terrestrial repeater

� Two choices concerning the wave propagation modelling� Deterministic ray-optical model for urban scenarios (and indoor)

for both satellite and terrestrial repeaters� Empirical LMS wideband channel model for rural scenarios (according to DLR)

for satellite only

� Path loss delay profile for each point within rectangular grid

� Channel profiles weigthed with Tx power and processing/propagation delay (IMR)form basis of SDMB system simulation

Wave Propagation

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Propagation Environments and DatabasesClutter- and Topographical Databases for Wide (Rural) Areas

� Land usage described by clutter database (channel profile according to clutter)

� Terrain profile given by topographical database

� Prediction resolution in the range 100-250m

Clutter data for vicinity of Paris (80x80km2) Topo data for Stuttgart area (30x30km2)

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Propagation Environments and DatabasesBuilding Databases for Urban (Suburban) Areas

� Vector building data, i.e. each building described by polygonal cylinder

� Terrain profile given by topographical database (resolution in the range 20-50m)(if required, i.e. urban area is not flat)

� Prediction resolution ~10m

Vector buildingdata for Munich

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Deterministic Ray-Optical Wave Propagation Modelling

� Based on 3-D building data in vector format

� Ray tracing considers dominant characteristics

� Reflection

� Diffraction

� Shadowing

� Wave guiding

� Max. number of threeinteractions (refl./diffract.)

� Reduced computationtime due to preprocessing

Wave Propagation

Rx

Tx

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Empirical Wideband LMS Channel Model� Provides typical profiles of the LMS channel in the 2 GHz band

� Based on the evaluation of measurement data

� LMS model (satellite channel) described in different publications of DLR

� Alternative to the deterministic ray-optical model (for wide/rural scenarios)

� Channel profile depending on satellite elevation angle and environment� Urban� Suburban� Rural

� Superposition of three submodels leads to channel profile� Direct path� Near echos� Far echos

Wave Propagation

22.09.2004 6th EMPS 2004 & 2nd ASMS 2004 13


Simulation Approach� Superposition of satellite and repeater channel profiles

� Consideration of link budget for each tap � adaptation of power and delay� Tx power per code� Tx antenna gain� handheld antenna gain� processing and prop. delay

� Sort taps according to increasing delay

� Distinction between data and signalling channels

� Consideration of rake receiver

SDMB System Simulation

Start of Rake window

End of Rake window

t in µs

power [dBm]

Signalling channels (common channels)

Other data channels

Dedicated data channel

Satellite 1st Repeater 2nd Repeater

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Rake Receiver� Definition of rake window (start, end, resolution)

� Calculation of C/I within each Rake finger � selection of N best fingers

� Signal power: Contribution of data channel in given Rake finger

� Interference power: Noise, inter-system and inter-beam interference power plus all contributions arriving out of the considered Rake finger (power addition)

� Max. ratio combining of N best Rake fingers (according to C/I)

SDMB System Simulation

Start of Rake window

t [µs]

power [dBm]

Signalling channels (common channels)Other data channels

Dedicated data channel{

{signal power C

code orthogonal

code orthogonal

= interference power I

1st Rake finger period

End of Rake window

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Simulation Parameters� Baseline SDMB architecture: 3 satellites providing 6 nation-wide spot beams

� Simulation of single satellite beam (10° east) with EIRP of 72 dBW

� Throughput of 2 traffic channels with 384 kbps each at one frequency carrier

� Simulations carried out for two environments: rural and urban

SDMB Simulation Results

Satellite Segment Terrestrial Repeater (IMR) Segment User Equipment Segment

Orbital height 36000 km Number of repeaters 3 Handheld antenna gain 0 dBi

Longitude 10° East Number of sectors per site 3 Loss for pol. mismatch (sat.) 3 dB

Tx power per beam 63 dBm Tx power per sector 30 – 35 dBm Receiver noise figure 6 dB

Tx frequency 2197.5 MHz Tx frequency 2197.5 MHz Rake window size 20 µs

Antenna gain 39 dBi Antenna pattern max. gain 18.5 dBi Rake resolution capabilities ¼ chip

Interbeam interference C/I 12 dB Antenna pattern HPBW 60° Number of rake fingers 6 / 12

Number traffic codes 2 Number traffic codes 2 Rake receiver threshold -117 dBm

Data rate per traffic code 384 kbps Data rate per traffic code 384 kbps Eb/Nt target satellite reception 10 dB

% of power per code 46.2 % % of power per code 46.2 % Eb/Nt target hybrid reception 7 dB

% of power for signalling 7.6 % % of power for signalling 7.6 % Fast fading margin 0 dB

22.09.2004 6th EMPS 2004 & 2nd ASMS 2004 16


Rural Environments� For different locations (latitudes of Seville, Rome, Stuttgart and Stockholm)

� Investigation of influence of satellite elevation angle

� Based on empirical wideband LMS channel model (according to DLR)

� No terrestrial repeater deployment

� Satellite coverage depends on EIRP per beam and Eb/Nt target


92100

92100

82

96

50

82

0

10

20

30

40

50

60

70

80

90

100

Sevillelatitude

Romelatitude

Stuttgartlatitude

Stockholmlatitude

Coverage (%) in rural environments for 2·384 kbps (target Eb/Nt = 10 dB)

Satellite EIRP = 72 dBW Satellite EIRP = 76 dBW

34

82

32

81

26

75

7

42

0

10

20

30

40

50

60

70

80

90

Sevillelatitude

Romelatitude

Stuttgartlatitude

Stockholmlatitude

Coverage (%) in rural environments for 2·384 kbps (target Eb/Nt = 13 dB)

Satellite EIRP = 72 dBW Satellite EIRP = 76 dBW

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Urban Environment� Based on ray-optical wave propagation model by using 3D building vector data� Pure satellite case and case with additional deployment of terrestrial repeaters


City centerof MunichGermany

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Urban Environment� SDMB coverage improvement by deployment of IMRs

� Investigation of 6 and 12 Rake fingers in Rake receiver

� Assessment of indoor coverage (assuming building penetration loss of 20 dB)


Outdoor coverage for pure satellite case (6 rake fingers) 61 %

Outdoor coverage for satellite + IMRs (6 rake fingers) 96 %

Outdoor coverage for satellite + IMRs (12 rake fingers) 99 %

Outdoor + indoor coverage for satellite + IMRs (6 rake fingers) 93 %

Outdoor + indoor coverage for satellite + IMRs (12 rake fingers) 97 %

� Deployment of repeaters leads to sufficient coverage even within buildings

� Coverage improvement for increasing number of Rake fingers (from 6 to 12)

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Conclusions

� SDMB Radio Network Planning Tool

� Based on Accurate 3D Ray-Optical

Wave Propagation Modelling

� SDMB System Simulation

� Simulation Results for Urban and Rural Scenarios

� Outlook

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Outlook: Indoor Penetration

� Indoor coverage important issue in SDMB business concept

� Extension of ray-optical wave propagation model: two approaches

� Large-scale approach by neglecting the interior wall structure, but considering an overall value for the building penetration loss (all buildings)

� Detailed-scale approach by taking into account the interior wall structure of a building, including ceilings, walls, windows, doors (single building)

� Impinging waves are attenuated when penetrating into a building

� Signal levels in building depend on building layout and the material of the walls

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Outlook: Indoor Penetration

Indoor Penetration Model on Detailed Scale � 3D characterisation of indoor scenario incl. material properties for different

objects (ceilings, floors, hard partitions, soft partitions, windows, doors)

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Further information about SDMB planning tool

Join our stand at the exhibition

Thank you for your attention!

Satellite Digital Multimedia Broadcast Radio Network ...ist-maestro.dyndns.org/MAESTRO/pages/Publication/ftp/MAESTRO/... · coverage outdoor and indoor 3G handset SDMB enabled ...

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