b. martin ([email protected])

Satellite Digital Multimedia Broadcast system : a new tool for Public Protection Disaster Recovery

B. MARTIN ([email protected])

Workshop on Broadband Wireless Ad-Hoc Networks and Services, 12th - 13th September 2002, ETSI, Sophia Antipolis, France

S-DMB : a new tool for Public Protection Disaster Recovery

p 2 All rights reserved © 2002, Alcatel

S-DMB for PPDR

Introduction

S-DMB System concept

Applications

User Equipment

Radio Access Network

S-DMB flexibility

System capacity

Conclusion



Introduction

S-DMB is based on 3GPP UTRA FDD W-CDMA re-use of chipset and radio protocol technology re-use of network infrastructure equipment re-use of 3GPP handsets with minor adaptation

Mass marketed communication medium where terrestrial coverage not deployed for business

attractiveness reasons terrestrial system suffered environmental damages terrestrial network requires complementary coverage

Low to high data rate broadcast, point to point, location services

IMT-2000 Mobile Satellite Service (MSS) frequency band

Based on a dedicated high power geo-stationary satellite



S-DMB System concept - Radio Access Architecture S-DMB is operable on its own

Frequency bands

Full reuse of 3GPP UTRA FDD W-CDMA waveform all the cells use the same frequency spectrum (full

frequency reuse) no frequency planning requirement

2110 2170

Downlink Uplink

MSST-UMTS

2200 MHz19801920 2010

MSST-UMTS Core band

2670

MSS T-UMTS

2690 MHz2500 2520

MSS Extension band

Downlink Downlink and uplink Uplink



S-DMB System concept - Radio Access Architecture : "On its own configuration"

Network infrastructure with fully standardized 3GPP equipment: Node B, RNC, OMC

Suitable for rural, suburban and urban when the handset is visible from the satellite

Networkinfrastructure

3GPPW-CDMA

FMSSFFSS



S-DMB System concept - Radio Access ArchitectureFull coverage with Gap Fillers Situations where the handset is not visible from the

satellite (blockage by buildings, indoor penetration, etc.)

network of Gap Fillers : signal repetition within a terrestrial coverage

Networkinfrastructure

FMSSFFSS

FMSS orFFSS

FMSS

FT-UMTS

Node B

Gap Filler



S-DMB System concept - Radio Access ArchitectureGap Fillers Gap Fillers :

Repetition and transparent amplification in the MSS band Synchronous transmission of the same content over the

same code at the same frequency UE Rake receiver combination of the terrestrial and

satellite signals 1 carrier reused in all the spots no terrestrial frequency planning requirement fast deployment low power/low cost 3GPP equipment may be co-located with 3GPP terrestrial Node Bs



S-DMB System concept - System coverage

One geostationary satellite,12 meters antenna diameter

European + North Africa coverage : 44 individual spots30 spots for restriction to Europe

200W per spot

Handset elevation :16 to 42°



Regulatory issues

Joint support of : European Commission European Space Agency (ESA) French Space Agency (CNES)

ETSI : Work item SES-00078 Evaluation of W-CDMA UTRA FDD as an IMT-2000 Satellite Radio Interface

ITU-8F : on going action for S-DMB scenarios proposal in the IMT-2000 extension band



S-DMB Applications

Primarily designed for mass market standard commercial purpose

Also designed for Public Protection and Disaster Relief Missions

Early warning and public alert :

Emergency telecommunication services

Mobile network infrastructure back-up

Government institutional communication tool in case of disaster

Assistance, Search And Rescue (SAR)

Global Monitoring for Environment and Safety (GMES)

Other Location Based Services



S-DMB User Equipment

S-DMB basic handset = 3G class 3 handset (250 mW) with adaptation for frequency agility to MSS

Possibility to transmission power and antenna gain boosting

Vehicular TransportablePortableHandset

UE type Max Tx power Antenna GainHandset 250 mW 0 dBiPortable 2 W 2 dBiVehicular 8 W 4 dBiTransportable 2 W 14 dBi



S-DMB data rates

Forward link : low data rate (~1.5 kbps) to high data rate (384 kbps)

Return link : due to transmit poser limitations, depending on S-DMB User Equipment configuration S-DMB User Equipment location in the satellite spot (i.e.

elevation) in any case, minimal low data rate service (Short Message

Service)

Handset Portable Vehicular TransportableSMS Yes Yes Yes YesSpeech 2.4 kbps Yes Yes Yes YesSpeech 12.2kbps No Yes Yes YesData 64 kbps No Yes Yes YesData 144 kbps No Yes Yes YesData 384 kbps No No Yes Yes

(assumption : 30° average UE elevation, 10 dB link margin)



Radio Access Network - S-DMB channelsMinimum set of 3GPP channels

CCCH Common Control ChannelDCCH Dedicated Control Channel

Logicalchannels

DTCH Dedicated Traffic ChannelRACH Random Access ChannelTransport

channels DCH Dedicated ChannelPRACH Physical Random Access Ch.R

etu

rn L

ink

Physicalchannels DPCH Dedicated Physical Channel

BCCH Broadcast Control ChannelCCCH Common Control Channel

Logicalchannels

DCCH Dedicated Control ChannelBCH Broadcast ChannelTransport

channels FACH Forward Access ChannelCPICH Common Pilot ChannelSCH Synchronisation ChannelP-CCCH Primary Common Control Ch.S-CCCH Secondary Common Control Ch

Forw

ard

Lin

k

Physicalchannels

AICH Acquisition Indicator Channel



Radio Access Network - Protocol stack for SMS

RLC

MAC

PHY

UE Node B RNC

PHY

RLC

MAC

PHY

SMS

CN

SMS : Short Message ServicePMM : PacketMobility ManagementRRC : RadioResource Control

RLC : RadioLink ControlMAC : Medium Access Control

RRC

PMM

SMS

PMM

RRC



Radio Access Network - Protocol stack for Broadcast/Multicast

Appli

PDCP/BMC

RLC

MAC

PHY

UE Node B RNC

PHY

PDCP/BMC

RLC

MAC

PHY

Appli

CN

PDCP : Packet Data Convergence ProtocolBMC : Broadcast/Multicast Control

RLC : Radio Link ControlMAC : Medium Access Control



S-DMB flexibility

Transmission resources pre-emption by authorised organisation: on a spot basis or on a subset of radio resources (W-CDMA code tree)

ordered at OMC level

Possibility to focus satellite power on a restricted regional area

Support of redundancy (gateway geographical dispatching

Dynamic priority management (subscriber classes)

Support of data encryption

Support of time diversity



System Capacity

SMS :

Test case Portable Vehicular Transportable12.2 kbps 24.4 kbps 122 kbps 146 kbps64 kbps 128 kbps 128 kbps 192 kbps144 kbps 288 kbps 288 kbps 288 kbps384 kbps - 768 kbps 768 kbps

Test case Handset Portable Vehicular Transport.12.2 kbps 1.07 Mbps 1.42 Mbps 1.77 Mbps 2.77 Mbps64 kbps 0.77 Mbps 0.96 Mbps 1.22 Mbps 1.66 Mbps144 kbps 0.86 Mbps 1.15 Mbps 1.3 Mbps 1.87 Mbps384 kbps 0.77 Mbps 1.15 Mbps 1.15 Mbps 1.54 Mbps

Forward Link

1900 simultaneous transfers, 827 SMS/second Maximum transfer delay : 6.8 s

Return Link



Conclusions

Full compatibility of S-DMB with UTRAN FDD W-CDMA S-DMB handset = 3GPP handset + MSS frequency agility 3GPP network infrastructure (Node B, RNC, OMC,…) reduce production costs

3GPP handsets = S-DMB UEs scattered S-DMB UEs are in ownership of people at the moment of

emergency situation

Easy preemption for security mission

Radio resource distribution to focused geographical areas

S-DMB may be deployed for commercial use and pre-empted for Public Protection Disaster Recovery mission

Fast deployment

b. martin ([email protected])

Documents

new tool

gpp terrestrial node

network of gap fillers

gpp handsets

gpp equipmentmay

frequency spectrum

satellite blockage

gpp utra fdd wcdmare