radio planning of hybrid dvb-h/umts · pdf fileradio planning of hybrid dvb-h/umts networks...

Radio Planning of HybridDVB-H/UMTS Networks

Thomas Kürner, Peter Unger

Institut für NachrichtentechnikTechnische Universität Braunschweig

Prof. Dr.-Ing. Thomas Kürner · Institut für Nachrichtentechnik · Technische Universität Braunschweig

S.2

Outline

• Introduction and Motivation• Scenarios for hybrid data traffic• Efficiency Estimation of hybrid networks• Approach to Network Planning• Unloading of UMTS cells in a hybrid network• Conclusion


S.3

Why thinking about hybridnetworks?

• Asymmetric interactive data services with high data rates• Neither stand-alone mobile networks nor stand-alone

broadcast networks can transmit such services• solution: combination of these networks => hybrid network

MobileCommunication

Network(GPRS, UMTS)

Broadcast Network(DVB-H)


S.4

Features of DVB-H

• DVB-H enables to transmit up to 10 Mbit/s to mobile handhelddevices run by a battery (e.g. PDA, Communicator, SmartPhone etc.)

• DVB-H offers high rate point-to-multipoint datacasting

• DVB-H is based on DVB-T

– using time slicing for less power consumption

– more robust signal with additional forward error correction

– new 4k-OFDM modus

• DVB-H offers no uplink channel, however, mobile devices willhave access to a mobile communication network (GSM,GPRS, UMTS).


S.5

Features of Hybrid Networks

• Hybrid networks combine two or more individual networks(e.g. UMTS and DVB-H)

• DVB-H / UMTS hybrid networks offer interactive serviceswith high data rates to many mobile users (downlink)providing full coverage

• Network planning for DVB-H / UMTS hybrid networks– finding positions and sizes of DVB-H cells– optimising required data rate to satisfy all user demands– analysing CAPEX and OPEX of a hybrid network– analysing influence on electromagnetic immission


S.6

Schematic Model of a Hybrid Network

• The ServiceManagementbalances thetraffic within thehybrid system byusing the logicalinterfaces.

• Logical Interfaces:ISP,IBO,IMO ,IMT.

MUX DVB-T/HTransmitter

Corenetwork

Basestation

Broadcast operator

Mobile network operator

Mobileterminal

DVB-H

UMTS

ServiceManagement

IMO

IBO

IMT

ISPService-Platform


S.7

Radio Planning of Hybrid Networks

• Architecture of a hybrid DVB-H/UMTS- network

Potential DVB-H cell coverage

structure of a TVnetwork

(e. g. DVB-T)

cellular networkstructure

(e. g. UMTS)


S.8

Description of DVB-H Scenarios

• Scenarios have different characteristics in terms ofgeographic distribution of users and intensity of usage ofDVB-H services

• Modifying Momentum Scenario by including DVB-H traffic asnew OpEnv classes and a new bearer service

• DVB-H channel video data rate 384 kbps (CIF 360x288 Pixels)

• For each Scenario Operational Environment, PopulationDensity, Average Load Maps are defined.


S.9

• Different scenarios for Berlin describing differentbehaviour of users (intensity, density, location)

Loveparade

MOMENTUM extension

Nightscene

Sightseeing &culture

Scenarios for Hybrid Networks


S.10

Popularity of Channels

• Popularity of Channelsdescribed by ZipfDistribution

• Minimum ListenerThreshold used to decidethe way of transmission

• For each scenario– 5 prepared Channels– alpha = 2 Broadcast Users

served by DVB-HChannels

= Offered Channels

BroadcastUsers served

by UMTS

Minimum ListenersThreshold

1

1 1( ) , 1 ,

C

i

P i i Ci iα α

=

= ≤ ≤ Ω = Ω

∑

Channel Number

User Distribution

Num

ber

of U

sers


S.11

Efficiency of Hybrid Networks

totalUC

BC UC

wG

w w=

+

• Comparing required datarate of a single unicastsystem to that of a hybrid(unicast/broadcast)system

• Gain > 1 indicates benefitfor hybrid networks interms of data rate


S.12

Principal DVB-H cell structure(Night scene scenario)

• Assumption of circular DVB-Hcells

• Automatic selection oftransmitter locations (maximisinggain)

Gainmap


S.13

Estimation of Tx Power and Antenna Height

• Calculation based on link-budget and path loss prediction(Walfish-Ikegami Model)

• Strategy: minimising difference to (ideal) circular DVB-H-cell

Coverage of DVB-H network(EIRP 52-56 dBm, antenna height 30m)

Tx power as a function of antenna height


S.14

Benefit of a Hybrid Network

• Unloading is measured as the ratio of data rates for a singleunicast network to the unicast part in a hybrid network

DVB-H - Network

UMTS - Network

Unloading of UMTS Cells

Unl

oadi

ng F

acto

r


S.15

Conclusion

• Definition of Scenarios based on the public scenario ofBerlin from MOMENTUM Project

• Characterisation of Efficiency of hybrid networks by GainValue

• Placing of DVB-H cells for an optimised hybrid network

• Unloading of UMTS networks

• Basis for realistic investigations of hybrid networks


S.16

Kontakt:

Institut für NachrichtentechnikTechnische Universität Braunschweighttp://www.ifn.ing.tu-bs.deE-Mail: [email protected]

Niccimonhttp://www.niccimon.de

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