WHAT IS DMR

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(((dmr)))

A Presentation for the DATA OVER PMR GROUP -

PMR BUSINESS MODEL

What is ((dmr))

A LOW COST LOW COMPLEXITY DIGITAL RADIO PROTOCOL

Using a polite protocol?

PMR Business ModelPMR Business Model

WHAT IS DMR(2)

SWISS

What is ((dmr)) (2)

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Peer to peer

Repeater

Trunked

ETSI & TEAM

Short MessagesShort Messages

EmailAVLTele

met

r

y

Protection from

Eavesdropping

Licenced

Licence

Exempt

Data

brick

Simultaneous

speech+data

((dmr)) – THE TEAM

WHAT IS DMR

• 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

• 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

What is ((dmr))

FEATURES CIRCLE

Range – Equal to FM

Low cost Terminal

Manufacture

Works out of the box

Good quality Speech

Battery LifeRepeaters2ch/carrier

Plug and Play Data

Scalable from two radio’s to

wide area fleets

Security

TRANSMITTER HAS A 12.5kHz

ANALOGUE MASK

DIFFERENTIATOR FROM FM

(((dmr)))(((dmr)))

Differentiator (from FM)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

Starting with two DMR units working back-to-back in licence exempt spectrum

Starting with two DMR units working back-to-back in licence exempt spectrum

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It Works Out of the Box

The Marketing is in the Box

BRICKS

These may be DatabricksThese may be Databricks

WORKING THROUGH A REPEATER

Working through a Repeater

Working through a Repeater

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SUPPORTS TWO SIMULTANEOUS CALLS

One Channel supports two independent

simultaneous calls

One Channel supports two independent

simultaneous calls

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SHARING A CHANNEL

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

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

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TRUNKED

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Repeaters may be linked

Repeaters may be linked

or sites may have multiple

channels

or sites may have multiple

channels

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DATA

Data

ApplicationAccess Interface

• MAP27

• Custom

• ………………

I am a Mode

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TEKKI STUFF(1)

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

STIMULUS (A)20mS

RESPONSE (B)5mS

CPU Processing

5mS TX Ramp

20mS VCO Switch

5mS SYNC tuning and timingPLL

5mS TX Ramp

20mS VCO Switch

(B) will not decode this

(B) will decode this

20mS

(B) will not decode this

(B) will not decode this

(B) will not decode this

Slot requiring a response from (B)

Slot 1 Slot 2 Slot 3 Slot 4 Slot 5 Slot 6

TEKKI STUFF(2)

Tekki Stuff(2)

360mS

Release PTT here

PLL(12)+SYNC(60)+SYS(22)+Recipient Address(18)

Pilot(14)+SenderAddress(18)+VOCODERHEADEROPCODE(8)+VocoderNegotiation(8)

Pilot(14)+TelegramType(2)+Vocoder Data

Pilot(14)+CALLMAINTENANCEOPCODE(8)+PTT ReleaseType

SYNC(60)+SYS(22)+RecipientAddress(18)+WAKEUPOPCODE(8)+WakupSlotNumber(4)

Press PTT here

POWER SAVE

DIVINITY

DATA and divinity

http://www.mod.uk/issues/pcomms/physics.htm

Capacity = Bandwidth x Log2 {1 + Signal to Noise Ratio}

TEXT BOOK

SIMULATIONS

Simulations for DMR

 7.2 Kbit/s 4.8 Kbit/s

MER=10 %

MER=1%

MER=10 %

MER=1%

450 MHz - 150 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 14.2 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

Throughput

RA

Signal strength (dbm)

Thr

ough

put

(kb/

s)

-119 -117 -115 -113 -111 -109 -107 -105 -103 -101 -99 -97 -95 -93 -91 -89 -87 -85

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MobileCoverage

PortableCoverage

Tetra 7.2kb/s

Tetra 4.8kb/s

Tetra 2.4kb/s

DMR 7.2kb/s

DMR 4.8kb/s

(((dmr)))Licensed Exempt

PMR446 - equivalentCEPT dedicated harmonised simplex channels in UHF1 (currently considering the PMR446 channels and if market demands further channels in the range 440-450MHz)

More Informations

Licensed PMR & PAMR

3W erp Handheld (max)10W erp Mobile (max)25W erp Base/Repeater (max)

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More Information

LPRA+URL’s

URL’sMOD web sitehttp://www.mod.uk/issues/pcomms/physics.htm

Shannon Articlehttp://www.fyldemicro.com/dmr/shannon.doc

DMR Articlehttp://www.fyldemicro.com/dmr/what_is_dmr.doc

This Powerpoint Presentationhttp://www.fyldemicro.com/dmr/pmr-dmr.ppt

LPRAThere is an opportunity for the DATA OVER PMR GROUP to influence what DMR becomes. WHAT DO YOU WANT?