1. .
(((dmr)))
A Presentation for the DATA OVER PMR GROUP -
WHAT IS DMR

2. What is ((dmr)) A LOW COST LOW COMPLEXITY DIGITAL RADIO PROTOCOL
Using a polite protocol?
PMR BUSINESS MODEL

3. PMR Business Model
WHAT IS DMR(2)

4. What is ((dmr)) (2)
Repeater
Peer to peer
Trunked
SWISS

5. Protection from Eavesdropping
Telemetry
AVL
Short Messages
Licenced
Short Messages
Licence Exempt
Data brick
Simultaneous speech+data
ETSI & TEAM

6. ((dmr)) – THE TEAM
WHAT IS DMR

7. What is ((dmr)) MB, VHF & UHF
A Digital PMR Standard serving Existing PMR markets. Licenced and licence exempt
Fits in existing PMR Spectrum
MB, VHF & UHF
Conventional ETS 12.5Khz channel (1 carrier/Ch)
plus 2 channels/carrier and channel sharing
Range as good as F.M
Simple LOW COST or fully featured radio’s (including data-bricks)
Peer to peer OR infrastructure modes SO –
Fully Scalable from two radio’s to large trunked networks
FEATURES CIRCLE

8. TRANSMITTER HAS A 12.5kHz ANALOGUE MASK Range – Equal to FM
Security
Low cost Terminal Manufacture
Scalable from two radio’s to wide area fleets
Works out of the box
(((dmr)))
Plug and Play Data
Good quality Speech
Repeaters 2ch/carrier
Battery Life
DIFFERENTIATOR FROM FM

9. Differentiator (from FM)
“Free” protection from eavesdropping
“Free” Voice Storage
“Free” Pager
“Free” Simultaneous speech and SMS
“Built-in” Data.
Spectrum Sharing
Two channels/carrier
STARTING WITH 2 UNITS BACK 2 BACK

10. The Marketing is in the Box It Works Out of the Box
Starting with two DMR units working back-to-back in licence exempt spectrum
BRICKS

11. These may be Databricks
WORKING THROUGH A REPEATER

12. Working through a Repeater
SUPPORTS TWO SIMULTANEOUS CALLS

13. One Channel supports two independent simultaneous calls
SHARING A CHANNEL

14. Independent Repeaters sharing a single channel (in licence exempt spectrum?)
TRUNKED

15. Repeaters may be linked
or sites may have multiple channels
DATA

16. Data I am a Modem Application Access Interface MAP27 Custom ………………
TEKKI STUFF(1)

17. Tekki Stuff Modulation – 4 level FM. Transmitter Mask EN300-113
Symbol Rate 6kb/s. Bit Rate 12kb/s
20mS slots each of 240 bits unprotected
18 slots/frame. 4 frames/superframe
TEKKI STUFF(2)

18. Tekki Stuff(2)
DIVINITY

19. Capacity = Bandwidth x Log2 {1 + Signal to Noise Ratio}
DATA and divinity
Capacity = Bandwidth x Log2 {1 + Signal to Noise Ratio}
TEXT BOOK

20. SIMULATIONS

21. Simulations for DMR 7.2 Kbit/s 4.8 Kbit/s MER=10 % MER=1%
7.2 Kbit/s
4.8 Kbit/s
MER=10 %
MER=1%
450 MHz Km/h
15.8
18.4 12
14.2
450 MHz - 50 Km/h
16.8
20.5
12.8 16
150 MHz - 50 Km/h
18.0
23.8
19.3
66 MHz - 5 Km/h
17.8
28.3
16.1
26.2
Static Conditions
7.8
8.4
6.6 7
THROUGHPUT

22. Throughput RA

23. (((dmr))) Licensed Exempt Licensed PMR & PAMR . PMR446 - equivalent
CEPT dedicated harmonised simplex channels in UHF1 (currently considering the PMR446 channels and if market demands further channels in the range MHz)
Licensed PMR & PAMR
3W erp Handheld (max)
10W erp Mobile (max)
25W erp Base/Repeater (max) .
More Informations

24. More Information
LPRA+URL’s

25. LPRA
There is an opportunity for the DATA OVER PMR GROUP to influence what DMR becomes. WHAT DO YOU WANT?
URL’s
MOD web site
Shannon Article
DMR Article
This Powerpoint Presentation