1

Future Proofing of TETRA Networks

Dr. M. NouriNew Technologies Senior ManagerChairman of EPT Working Group 4

(WG4) High Speed Data (HSD)

Summary

• Initial Planning for Expansion• Feature / Software Release Plans• Upgrade to Integrated TETRA1 Plus

TETRA2 TEDS (TETRA Enhanced Data Services)

• Frequency Allocation Matters• Conclusions

Initial Planning for Expansion• Plan for additional switching centres• Plan for phased completion of

coverage• Channel addition to base stations as

traffic grows with time• Sizing of databases for the final

capacity• Plan for external interfaces and their

introduction time-plan• Subscriber differentiation via VPN

Feature Release Plans• Identify currently available features• Confirm the upcoming feature release plans• Commercial trade-off against future

functionality• Secure a realistic timetable for feature

releases• Take into account the need for the TIPS

process for certain features and the time impact

What Services? What Data Speeds?

• Is single slot TETRA1 sufficient• Do you require TETRA1 multislot operation

now or in the near future• What are the likely speeds required for the

future• Is low complexity low speed TEDS sufficient• Do you require medium or high speed TEDS in

the future

Current TETRA 1 Speeds: Multi-slot

Number of timeslots

No protection

Low protection

High protection

1

7,2

4,8

2,4

2

14,4

9,6

4,8

3

21,6

14,4

7,2

4

28,8

19,2

9,6

Bandwidth on demand

• TETRA Advanced Packet Service• An Overlay network• Based on the E-GPRS technology• Standardisation drafting completed• Designed for PAMR market• Not deployed to date

TETRA RELEASE 2TETRA RELEASE 2

TAPSTAPS TEDSTEDS

• TETRA Enhanced Data Service• Full Compatibility with TETRA 1• Allows migration from TETRA 1• Standardisation in progress• 5 technologies proposed initially• Designed for all TETRA market

sectors

Two Technologies for TETRA2 HSD

External IP packet data networks

TETRA1 Infra-

structure

TETRA1

EGPRS/3G

networks

IPI

ISI

E-GPRS / 3Gair interface

Direct Mode

TETRA1

T1

TETRA1 Infrastructure

T1 T2 EDGE TransceiverTETRA1 Transceiver E-GPRS Type Interfaces

TAPS Infrastructure

T2

E-GPRS/EDGEair interface

Overlay TAPS plus TETRA1 Network

TEDS Technology Parameters• Multi-carrier platform with TDMA carriers.• Adaptive selection of modulation and coding according to

propagation conditions.• Agreed modulation schemes:

/4 DQPSK for common control channel D8PSK for early migration requiring modest increase in speed 4 QAM for efficient links at edge of coverage 16 QAM for moderate speeds 64 QAM for high speed

• Carrier bandwidths: 25, 50, 100 and 150 kHz.• Expected user bit rates in the region of 30 to 400 kbit/s• TETRA1 higher layer protocols to be adapted for TEDS.

0 150 300 450 600 750

64QAM / 150kHz 691 kb/s64QAM / 100kHz 461 kb/s16QAM / 100kHz 307 kb/s64QAM / 50kHz 230 kb/s16QAM / 50kHz 154 kb/s64QAM / 25kHz 115 kb/s 4QAM / 50kHz 77 kb/sD8PSK / 25kHz 54 kb/sDQPSK/ 25kHz 36 kb/s

kb/s

TETRA1

Note: No channel coding assumed.

How Do Gross Speeds Compare ?

External IP packet data networks

TETRA1 Infra-

structure

TETRA1

EGPRS/3G

networks

TEDS+TETRA1

IPI

ISI

E-GPRS / 3Gair interface

Direct Mode

TETRA1

T2 T2T1T1

Integrated TEDS plusTETRA1 Infrastructure

T1 T2 TEDS TransceiverTETRA1 Transceiver E-GPRS Type Interfaces

Integrated TEDS + TETRA1 Network

Model 1

Four base stations with omni-directional antennas

Model 2

One base station with TEDS sectorized antennas

TEDS

TEDS

TEDS

TEDS

TEDS

TEDS

TETRA1

TEDS: Coverage Planning

Content Delivery

News, weather, sports Local information In-vehicle services Intranet access Information search On-line

magazine/trade publications

On-line banking E-commerce/on-line

shopping E-books download On-line games Music-on-demand Video-on-demand Travel services

advertising Job scheduling

Content Delivery

News, weather, sports Local information In-vehicle services Intranet access Information search On-line

magazine/trade publications

On-line banking E-commerce/on-line

shopping E-books download On-line games Music-on-demand Video-on-demand Travel services

advertising Job scheduling

Hybrid Communication

Video-telephony Screen sharing

Hybrid Communication

Video-telephony Screen sharing

Data Communication

E-mail Advanced e-mail

(text, drawings, images, video)

File transfer Forums

Data Communication

E-mail Advanced e-mail

(text, drawings, images, video)

File transfer Forums

Voice Communication

Voice Voice mail

Voice Communication

Voice Voice mail

Services required in TETRA networks in the near future

Emerging Services & Contents

Voice Communication

Voice Voice mail

Voice Communication

Voice Voice mail

Data Communication

E-mail Advanced e-mail

(text, drawings, images, video)

File transfer Forums

Data Communication

E-mail Advanced e-mail

(text, drawings, images, video)

File transfer Forums

Content Delivery

News, weather, sports Local information In-vehicle services Intranet access Information search On-line

magazine/trade publications

On-line banking E-commerce/on-line

shopping E-books download On-line games Music-on-demand Video-on-demand Travel services

advertising Job scheduling

Content Delivery

News, weather, sports Local information In-vehicle services Intranet access Information search On-line

magazine/trade publications

On-line banking E-commerce/on-line

shopping E-books download On-line games Music-on-demand Video-on-demand Travel services

advertising Job scheduling

Optional

TEDS RF

LLC

SNDCP

Application

MAC

TEDS TerminalProtocol Stack

IP

MEX

MLE

Multimedia Applications in TEDS

• Optional MEX layer defined for TEDS• Allows up to 8 multimedia

applications• Allows QoS negotiation

– Throughput– Delay– Priority– Reliability

• MEX layer can be by-passed• QoS attributes can be adjusted

during session

Frequency Planning• Frequency band allocation for TMO (national)• Frequency band allocation for DMO• Subscriber density distribution to assist

channel allocation• Cell re-use factor (cluster size)• Cell sectorisation may provide benefits• Channel allocation for the final network• Availability of the spectrum for later TEDS

additions

380 390 400 410 420 430 450 460 470440 MHz

Emergency ServicesSpectrum Available Now

(in most European Countries)

PAMR TETRA (Shared)(Country Specific)

Spectrum Available Now (in most European Countries)

Early Private TETRA (PMR) Adopters(Country Specific Allocations)

Limited Spectrum available

PMR & PAMR (Civil TETRA)(Country Specific Allocations)

Limited Spectrum Available(Requires re-farming in most

Countries)

Possible Civil Allocations in some Countries and/or

PSS Expansion band

TETRA Spectrum Assignments: CEPT ERC Decisions 96 (01) and 96 (04)

Spectrum

MHz

(870-876/915-921MHz)PMR & PAMR (Civil TETRA)

870 880 890 900 910 920 930 940 950 960

(876-880/921-925MHz)GSM-R (890-915/935-960MHz)

GSM Current Band

(880-890/925-935MHz)GSM Expansion Band

Spectrum (contd.)

Conclusions• The TETRA standard provides a number of

provisions for future proofing TETRA networks• The level of these provisions is supplier

dependent• Careful planning of TETRA networks with due

consideration for future growth and services results in a wiser investment

• Such a network is expected to be technologically competitive for the next 20 years

Thanks for your attention