Motorola P25 Simulcast

Rick PollakSolutions ConsultantMotorolaAugust 6, 2008

“Hi, I’m Rick Pollak and I’m a radio geek!”

Motorola P25 Simulcast – APCO International Annual Conference and Exposition – August 6, 2008

What do you think of when you see the Olympics logo?

Five Olympic Rings

A police officer might think of five doughnuts

Five Olympic Rings

I think of a five-site P25 simulcast system

Five Olympic Rings

Fencing

Sports Fan’s View

Fencing

Radio Geek’s View

Sports Fan’s View

Radio Geek’s View

Synchronized swimming

Sports Fan’s View

Synchronized transmitting

Radio Geek’s View

Clear audio, seamless roaming, and simple operation

A Winning Combination

Here’s what we’ll be talking about today

Stamford

Backhaul

Phase 2

Top Five Reasons for P25 Simulcast

Why select P25 simulcast over multicast?

1. Frequency efficiency2. Better coverage3. Full capacity everywhere4. Clear audio throughout the network5. Multiple sources for subscribers

Leaders

1. Frequency Efficiency

Site 1

Site 2

Site 3

F3F2F1

Wide-area coverage with limited frequencies

Site 1

Site 2

Site 3

F3F2F1

F9F8F7

F6F5F4

1. Frequency Efficiency

Multicast may need more frequencies than you have

2. Better Coverage

Tight synchronization keeps signals in phase

2. Better Coverage

Signals combine in overlap zones to improve coverage

2. Better Coverage

Overlap means better coverage for first responders

3. Full Capacity Everywhere

4 channels

6 channels

Do you know where your next 911 call will come from?

3. Full Capacity Everywhere

10 channels

Simulcast gives you full capacity for emergencies

4. Clear Audio Throughout the Network

Clear audio in single-site capture area

4. Clear Audio Throughout the Network

Clear audio and seamless roaming in overlap areas

5. Multiple Sources for Subscribers

P25 simulcast is open architecture

5. Multiple Sources for Subscribers

You can buy radios from multiple manufacturers

Why select P25 simulcast over multicast?

1. Frequency efficiency2. Better coverage3. Full capacity everywhere4. Clear audio throughout the network5. Multiple sources for subscribers

Leaders

What’s the most important reason for your system?

The Most Important Reason

First responders need mission critical performance

P25 simulcast network in Stamford, Connecticut

Stamford

Stamford, Connecticut

Multicast to simulcast – improved operations

Stamford, Connecticut

Suburb of NYC, 37.7 square miles – 117,000 people

Existing Stamford System

4 channels

6 channels

Analog multicast system from early 1990s

New Simulcast Network in 2008

Digital simulcast – 4 sites with 10 channels everywhere

10 channels

Stamford Simulcast Network

Prime site

Remote sites

Microwave connectivity from prime site to remotes

Remote Site Configuration

Simple remote site configuration – no site controller

800 MHz stationsGPS interfaceRouters

Prime Site Configuration

Prime site has RF, controllers, and comparators

800 MHz stationsComparatorsRedundant prime site controllerGPS interfaceRouters

Audio Processing

Comparator votes the strongest received signal

Audio Processing

Comparator routes audio to sites with appropriate delays

User Benefits

Lower Total Cost of Ownership

P25 simulcast design saves Stamford money

Fewer sites because of additive overlap coverage

Compact stations mean smaller shelters

Lower maintenance costs with digital simulcast

Linear simulcast modulation

Stamford

Linear Simulcast Modulation

Why would you need linear simulcast modulation?

Developed to increase site spacing with12.5 kHz channels

.025 .050 .075.0375 .0625.0125 .0875

P25 Phase 1 uses C4FM modulation

Linear simulcast uses CQPSK modulation

“Dibit” pairs mapped to phase changes in RF carrier

How does that increase site spacing?

LSM has a longer dwell in the signal eye pattern

C4FM CQPSK

Dwell Dwell

What if one signal arrives a bit late?

We want all of the signals to get a gold medal

Arrival times can be further apart with CQPSK

Site 1

Site 2

C4FM Simulcast Modulation

Non-linear site spacing is 8 miles maximum at 12.5 kHz

CQPSK Linear Simulcast Modulation

Site spacing increases with linear simulcast modulation

CQPSK Linear Simulcast Modulation

LSM means lower initial and ongoing costs

CQPSK linear from infrastructure to subscriber

C4FM non-linear from subscriber to infrastructure

You can buy radios from multiple manufacturers

Radios can decode C4FM and CQPSK

Onondaga County, New York

15-site, 15-channel UHF linear simulcast system

Longer path lengths:10.19 miles11.24 miles11.39 miles12.27 miles

State of Rhode Island

24-site, 3-cell linear simulcast at 800 MHz

Longer path lengths:10.4 miles12.4 miles14.3 miles

Longer path lengths means lower costs

Backhaul requirements for P25 simulcast

Stamford

Backhaul

Telco T1

Ethernet

Point to Point

Wireless Broadband

Flexible Backhaul Design

End-to-end delay determines backhaul design

IP Simulcast

Channel banks are not required for IP simulcast

IP Simulcast

IP Network

Channel banks are not required for IP simulcast

Traditional Microwave

Traditional microwave has the lowest latency

Motorola PTP Series Microwave

PTP series is an alternative to traditional microwave

Motorola PTP Series Microwave

Alternative to line of sight microwave networks

Telco T1

Ethernet

Flexible Backhaul Design

Many options available for simulcast backhaul

Point to Point

Wireless Broadband

Project 25 Phase 2

Stamford

Backhaul

Phase 2

P25 Phase 2 Simulcast

12.5kHz

TDMA gives you more capacity without adding channels

I thought you couldn’t simulcast TDMA

Site 1

Site 2

Site 3

F3F2F1

F9F8F7

F6F5F4

You can have your cake and eat it too!

TDMA Simulcast

Phase 2 simulcast will use HDQPSK linear modulation

Will the performance be the same as CQPSK?

HDQPSK? ?

Our engineers are busy analyzing the data

We’ll be using performance enhancing antennas

Don’t worry, you won’t have to P25 in a cup!

What do you think of when you see the Olympics logo?

Five Olympic Rings

Sports Fan’s View

Synchronized swimming

Synchronized transmitting

Radio Geek’s View

Stamford

Backhaul

Phase 2

A Winning Combination

First responders need mission critical performance

P25 simulcast gives you mission critical performance

Rick PollakSolutions ConsultantMotorolaAugust 6, 2008

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