1. User Technical Committee Radio Technology Discussion
FOXCOMM
User Technical Committee
Radio Technology Discussion

2. Agenda Radio Terms/Definitions Multicast vs. Simulcast
Analog vs. Digital
Conventional vs. Trunking
Frequency Considerations
Interop / Mutual Aid / Migration
Data
Comments/Questions?

3. Multicast vs. Simulcast

4. Multicast f f f f f f Different frequencies at each site
Good fit when excess channels available
Mobile coverage
Low number of talkpaths required at a site C A L P H O N R G M E f f f f f f 1 2 3 4 5 6

5. Simulcast
Most frequency efficient architecture
More Coverage with overlap
Enhanced In-Building Coverage
Site Expansion Without Additional Frequencies
Expansion Without Reprogramming Radios C A L P H O N R G M E
Much like the stereo speakers on the previous slide, a simulcast trunked radio system broadcasts the same audio information on the same frequency. To function properly a well designed simulcast radio system assures that the signal arrives at the receiving unit (portable or mobile radio) at the same time and under the same conditions. f 1 2 3 4 5 6 f 1 2 3 4 5 6

6. Simulcast Configurations Improves “Shadowing”

7. Analog vs. Digital

8. Analog vs. Digital Radios
Modulator/
Amplifier
Analog Radio
Digital Radio
Modulator/
Amplifier
Analog/
Digital
Converter
Conventional and Trunked
VHF, UHF, 700 and 800Mhz

9. Benefits of Digital Technologies
Improved Signaling Capabilities
Excess bandwidth used for signaling & control
Enhanced features such as Unit IDs Identification, Adaptive Power Control, etc.
Forward Error Correction
Digitized
Audio
Embedded
Signaling

10. Benefits of Digital Technologies Improved Audio Quality
Good
Audio
Quality
Analog
Poor
Strong
Signal Strength
Weak

11. Conventional vs. Trunking

12. Conventional Radio Chan 1 Chan 2 Channel 2 Channel 1 EMS Police
Fire
Channel 1
In Use
Channel 2
Not In Use
Call
Blocked
Currently Transportation is using Channel 1. Fire needs to communicate, but they can not until Transportation is finished. In the meantime, Risk Management’s Channel 2 is sitting idle. This is a waste of a needed resource. The Risk Management channel sits idle while the demand piles up on the shared channel between transportation and SIU.
Not only is this wasteful, Fire must listen to another departments conversation, and wait for an opportunity to grab the channel.
EMS
Police
Fire

13. Trunked System - Talkgrouping
EMS
Fire
Voice
Communication
Idle
Idle
Idle 1 2 3 4 5
Police
The radios in the SIU talkgroup internally switch to Channel 4 and everyone in the SIU talkgroup can begin talking.
All of this usually occurs in less than 500 ms (1/2 second).
All other users on other talkgroups will receive the outbound assignment information and ignore it as the information is not for their talkgroup.
There is a voltage controlled oscillator within the radio which allows it to transmit at any selected frequency. However, the radio can only communicate on one frequency. Once it switches from the control channel to the voice channel, it is no longer communicating with the central controller on the control channel. Also, the communication is only half-duplex. The radio can either be transmitting or receiving, but not both simultaneously.
Controller
Talkgroups “rest” on the control channel
Talkgroup receives voice channel grant upon request
When conversation complete all units return to control channel

14. Trunking Features Talkgrouping Push To Talk ID Emergency Private Call
Call Alert
Scan
Priority
Busy Queing
Police

15. Frequency Band Considerations

16. Frequency Band Considerations – Organized vs. Unorganized
Base TX
Base RX
VHF
136MHz
172MHz
700/800 MHz
764MHz
776MHz
794MHz
824MHz
851MHz
869MHz

17. Frequency Band Considerations – Physical Space
700/800
MHz
VHF 19 RU

18. Frequency Band Considerations – Site Selection
VHF
Restricted
Water Towers
are not usable
700/800 MHz
Not as Restricted
Water Towers
are usable
20ft
(min)
40ft
(min)

19. Frequency Considerations – In Building Penetration Losses
Bldg Type
Building Loss (dB)
Example
VHF
700/800 MHz
Light 8 4
Residential, Small Commercial
Medium 20 14
Apartments, Office Buildings
Heavy 30 18
Shopping Mall, Large Commercial

20. Coverage (Specifically - In Building)
Operational Issues
Coverage (Specifically - In Building)
Potential Solutions: Simulcast
700/800MHz
Congestion/Capacity
Potential Solutions: Trunking
Interference
Potential Solutions: 700/800MHz

21. Interoperability / Mutual Aid / Migration

22. Interoperability/Mutual Aid/Migration
Issue:
How do users operating on a 700/800MHz system talk to neighbors who operate on VHF?
Scenario #1 – Incident occurs within 700/800MHz coverage area.
Possible Solution – VHF mutual aid channel(s) are integrated into the 700/800MHz system and patched to mutual aid talkgroups for VHF mutual aid/interoperability. The patch can be set up “on the fly” or permanently through the console.

23. Interop - Scenario #1
IP Network
VHF
700MHz IP

24. Interop – Scenario #1
VHF
700MHz IP 4W
IP Network

25. Interoperability/Mutual Aid Continued
Scenario #2 – Incident occurs outside of the 700/800MHz coverage area.
NOTE
Mobile and portable on the street coverage will extend well beyond county borders
Possible Solution(s)
Portable Cross-Band DVRS
700/800MHz Mutual Aid Repeater to extend coverage into neighboring counties
Portable Swap
Carry Two Subscribers (VHF and 700/800MHz)

26. 700MHz RADIO COVERAGE RANGE VHF RADIO COVERAGE RANGE
Interop - Scenario #2 - Portable DVRS Solution
700MHz RADIO COVERAGE RANGE
VHF RADIO COVERAGE RANGE

27. DVRS Extends Portable Radio Communications in RF Shielded Areas.
Why use DVRS?
DVRS Extends Portable Radio Communications in RF Shielded Areas.
PORTABLE RADIO COVERAGE RANGE
DVRS Extends Portable Radio Communications in Areas where only Mobile Radio Coverage is available.
MOBILE RADIO COVERAGE RANGE

28. MOBILE and Portable On the Street RADIO COVERAGE RANGE
Why use DVRS?
DVRS Provides a Migration Path for users operating with VHF subscribers
MOBILE and Portable On the Street RADIO COVERAGE RANGE

29. How does it work? Outbound Calls
DVRS
SYSTEM MODE
(DVR + XTL)
XTL Ant
DVR Ant
Local Portable

30. How does it work? Inbound Calls
DVRS
SYSTEM MODE
(DVR + XTL)
XTL Ant
DVR Ant
XTL Ant
DVR Ant
System Portable
In Car Monitor
Local Portable
Local Portable

31. How does it work? Mobile Microphone PTT
DVRS
SYSTEM MODE
(DVR + XTL)
XTL Ant
DVR Ant
XTL Ant
DVR Ant
System Portable
Local Portable

32. Data

33. Mission Critical Data Solutions
Tier 1 – 9.6/19.2 kbps
Tier kbps
Video
Tier 3 – 200k-1M
Tier 4 - Megabits
Multimedia
Includes Tier 1&2
Intranet Access
Internet Access
Images (Tx/Rx)
Video (buffered)
Remote Camera
Includes Tier 1-3
Office Apps
Video (full motion)
Remote camera viewing / control
OTAP (reflash mobile radios)
Video archiving
Includes Tier 1
Fingerprints (Tx)
Mug Shots (Tx/Rx)
Reports (Tx)
Intranet (constrained)
Internet (constrained)
AVL
Messaging
Dispatch
Text messaging
Query Databases
Driver’s License
License Plates
Warrants
Text Based
Browser

34. Optimal Performance Enables New Applications
DONE…..
Loading…
Push Enter to Begin…
Tier 2
Tier 1 (19.2kbs)
Details of the Applications Performance Slide
The slide simulates the download of a file
37.5 kB JPEG file
The simulated networks are:
HPD -> 96 kbs raw data rate
HSD50 -> 230 kbs raw data rate
DataTac -> 19.2 kbs raw data rate
IV&D -> 9.6 kbs raw data rate
No middleware compression was factored into the simulation.
Tier 3
Tier 1 (9.6kbs)

35. ( County, Region, State or Nationwide)
Motorola’s Mission Critical Data Platform
Primary Voice System
( County, Region, State or Nationwide)
9.6 kbps
96 kbps
230 kbps 80
Primary Data System
(City Wide)
MCLB
(at Hot Spots)
Hotspots
up to
54 Mbps
Vision:
IVD and HPD are ASTRO 25 IP Data solutions…..we can offer TODAY.
Excellent coverage to meet the needs of users and applications.
If higher data rates are needed, then Wideband Data and Broadband can be offered. Wideband Data is planned in the 700 MHz band with 50 KHz channel allocations.
KEY MESSAGE: We are planning a range of DATA SOLUTIONS to cover the VARIED NEEDS of customers.
High Speed
(City Wide)

36. Questions?
Comments?