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Agenda. Radio Basics Conventional Versus Trunked Radio Frequency Spectrum - Project 25 Phase I Versus Phase II Trunked System Components (What makes up a system?) Wide-Area Trunking Systems Vendor Proposals Overview Vendor Demonstrations Overview Evaluation Form Overview. 1. 2. . . .

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Agenda l.jpg
Agenda

  • Radio Basics

    • Conventional Versus Trunked Radio

    • Frequency Spectrum - Project 25 Phase I Versus Phase II

    • Trunked System Components (What makes up a system?)

    • Wide-Area Trunking Systems

  • Vendor Proposals Overview

  • Vendor Demonstrations Overview

  • Evaluation Form Overview


Example of conventional vs trunked radio system l.jpg

1

2

. . .

. . .

19

16

1

1

2

2

Houston Police

Houston Fire/EMS

Example of Conventional vs. Trunked Radio System

  • Currently Police and Fire each have their own, separate bank of conventional channels.

  • Now lets look at these channels on Sunday at 2:00 AM.

  • Police channels get overloaded in this peak activity time.

  • Meanwhile there are Fire Channels “available” that are not used by those Police who are waiting.


Conventional radio system like hpd and hfd have today l.jpg
Conventional Radio System(Like HPD and HFD have today)

  • No inherent redundancy for channel failure

  • System has Individual frequencies or channels dedicated to specific agencies for their use

  • Channel congestion and crowding

1

2

3

4

5

Police

East

Police

West

Fire

Disp.

Fire

Tac

EMS


Trunked radio system l.jpg
Trunked Radio System

  • Trunked radio systems were originally developed to provide more efficient use of available radio frequencies and to support a greater number of radio users than conventional systems equipped with the same number of frequencies.

  • Trunked systems are computer driven radio networks that can provide a more complete set of operational features & functions than conventional systems


Example of conventional vs trunked radio system6 l.jpg

2

3

8

4

7

6

8

2

4

. . .

N

5

1

7

3

1

Policeand Fire Share channels!

5

6

Example of Conventional vs. Trunked Radio System

  • Now lets examine that same Sunday at 2:00 AM scenario, this time in a trunked system . . .

  • Police and Fire share a “pool” of channels

  • A “Control Channel” manages trunked calls

  • The Fire Channels that were available but not used during the Police peak activity time may now be used.


How trunked systems work l.jpg

EMS TG

PD East TG

Dispatch

Point

Dispatch

Point

Fire TG

PD West TG

Dispatch

Point

Trunked Controller

Dispatch

Point

How Trunked Systems Work

  • Interconnects repeaters with a computer

  • Computer regulates channel usage

  • User agencies are assigned to “talkgroups”

  • Common pool of channels shared by all

  • Channel redundancy is inherent

1

2

3

4

5

Trunked Controller


Example of talkgroups in a trunking system l.jpg
Example of Talkgroups in a Trunking System

Talkgroup A

Talkgroup B

Dispatch

Point

Dispatch

Point

1

2

3

4

5

Trunked Controller


Trunking system in idle mode l.jpg

OSW

OSW

1

Trunking System in Idle Mode

Idle Radios Monitor the Control Channel

Talkgroup A

Talkgroup B

Dispatch

Point

Dispatch

Point

2

3

4

5

Trunked Controller Assigns a “Control Channel”

to Coordinate Radio Traffic

Trunked Controller


A talkgroup call request l.jpg

1

A Talkgroup Call Request

Talkgroup A

Talkgroup B

Dispatch

Point

Dispatch

Point

ISW

(Call Request)

2

3

4

5

Trunked Controller


Repeater designated as voice channel l.jpg

1

Repeater Designated as Voice Channel

Talkgroup A

Talkgroup B

Dispatch

Point

Dispatch

Point

OSW

(“go to channel 5”)

2

3

4

5

Trunking Controller


Communication through assigned voice channel l.jpg

1

Communication Through Assigned Voice Channel

Talkgroup A

Talkgroup B

Dispatch

Point

Dispatch

Point

Voice Communication

2

3

4

5

Trunking Controller


Request for access when all channels are busy l.jpg

1

Request for Access When All Channels Are Busy

Talkgroup A

Dispatch

Point

ISW

(Call Request)

2

3

4

5

Trunking Controller


User placed in new user queue l.jpg

BUSY QUEUE

1

User Placed in New User Queue

Talkgroup A

Dispatch

Point

OSW

(System Busy)

2

3

4

5

1. Talkgroup A

Trunking Controller


Voice channel assignment l.jpg

3

5

3

BUSY QUEUE

1

Voice Channel Assignment

Talkgroup A

Dispatch

Point

Voice Communication

OSW

(“go to Channel 3”)

2

3

4

5

1. Talkgroup A

TrunkingController


Trunked system features l.jpg

. . data . . data . . data . .

The continuous “Control Channel” enables many advanced features!

1

Trunked System Features

  • User validation before system access

  • Push-To-Talk Identification for all users

  • Subscriber Access Control (limits who can get on the system)

  • Priority Access (Most important calls given priority)

  • Emergency Signaling (Emergency button on radios)

  • Talkgroup Scan

  • Busy Queuing

  • Larger systems can handle very heavy traffic loads


Frequency spectrum l.jpg

Low

Band

VHF

“800”

UHF

“New 700”

800 MHz

39

150

450 - 512

700 MHz

Houston Police & Fire Today

Houston PW & HAS Today

City’s New 700/800 MHz Trunked Radio System

Frequency Spectrum

For 700, FCC says . . .

* Digital Only

* Squeeze in more “Talkpaths”


Frequency spectrum18 l.jpg

Low

Band

VHF

“New 700”

“800”

UHF

700 MHz

800 MHz

39

150

450 - 512

Houston Police & Fire Today

Houston PW & HAS Today

Frequencies

Frequency Spectrum

For 700, FCC says . . .

* Digital Only

* Squeeze in more “Talkpaths”

450

550

650

750

950

850


Fcc squeeze in more talkpaths l.jpg

All of City’s Existing UHF and 800 MHz systems utilize 25 KHz

Frequency 1

Frequency 2

25 KHz

Freq 2

Freq 1

Standards are published, Systems in operation today !

Project 25 Phase I

FCC says: “2–to-1”

12.5 KHz

Standards adopted, but not published !

Project 25 Phase II

FCC says: “4–to-1”

Project 25 Phase II

“Requires TDMA Technology"

Proposed by Vendors, not in operation today !

Talkpath 1

Talkpath 2

FCC “Squeeze In More Talkpaths”


25 khz channels from the past l.jpg

25 Feet KHz

25 KHz Channels from the Past


12 5 khz channels from project 25 phase i l.jpg

12.5 Feet KHz

12.5 KHz Channels from Project 25 Phase I


12 5 khz channels from project 25 phase ii l.jpg

25 Feet KHz

12.5 Feet

12.5 KHz Channels from Project 25 Phase II

In Phase II, TDMA allows 4 talkpaths per 25 slot


Trunked system components l.jpg
Trunked System Components KHz

  • Now lets look at the key components that make up a modern trunked radio system

    • Repeater Sites (these provide radio coverage)

    • Wide-Area System (more than one repeater site)

    • Master Control Point (controls & manages the network)

    • Site Connectivity (links between the sites, control point, & dispatch)

    • User Radios (hand held radios & mobile (vehicle) radios)


Basic trunked repeater site l.jpg

Antenna System KHz

EquipmentShelter

Tower

1

2

3

N

AC Generator

Battery System

Repeaters (channels)

Trunking Controller

Basic Trunked Repeater Site


Basic trunked repeater site25 l.jpg

4 – 6 miles KHz

Basic Trunked Repeater Site

  • One repeater site provides in-building coverage for approximately 4 – 6 miles.

  • For the City of Houston’s service area, that translates to 40+ sites ! !


Wide area systems l.jpg
Wide-Area Systems KHz

  • When do you need a Wide-Area System?

    • When more than one repeater site is needed to provide the required radio coverage!


Wide area systems27 l.jpg

. . . and a Backup Master Site adds reliability KHz

HEC Master Site

In a Wide-Area system, a “Master Site” is required to control all repeater sites.

. . . a Microwave System or Fiber Network connects all of the repeater sites to the Master Site

Wide-Area Systems

The City needs a Wide-Area system


Wide area systems28 l.jpg

HEC Dispatch KHz

Wide-Area Systems

Now add the Users to the system . .

HEC Master Site


Wide area systems simulcast l.jpg

HEC KHzMaster Site

Simulcast Prime Site

Wide-Area Systems: Simulcast

  • In the proposed Simulcast systems, all repeater sites are connected with microwave

  • One of the sites is a “Simulcast Prime Site” and is connected to HEC Master Site


Wide area systems simulcast30 l.jpg

F1 KHz

F1

F1

F1

F1

Wide-Area Systems - Simulcast

  • In Simulcast, all repeater sites use the same set of frequencies

  • This improves coverage since the radio can actually receive and transmit to multiple sites at once

  • A group of Simulcast Sites makes a “Simulcast Subsystem” (there are limits to the number of simulcast sites)

South Simulcast Subsystem


Simulcast subsystems l.jpg

Central Simulcast Subsystem KHz

F1

F1

WestSimulcast Subsystem

F1

Simulcast Subsystems

  • Multiple Simulcast Subsystems are required to accommodate the number of repeater sites needed for the City of Houston

South Simulcast Subsystem


Simulcast subsystems32 l.jpg

F1 KHz

F1

F1

Simulcast Subsystems

  • Each Simulcast Subsystem uses a different set of frequencies

  • Thus special “Roaming” software is required in all subscriber radios to allow the radios to seamlessly move throughout the City.

F3

F2

F1


Simulcast subsystems33 l.jpg

F4 KHz

PublicWorks

F3

F1

F1

F2

F1

F1

Simulcast Subsystems

  • Public Works has different radio coverage requirements, thus they have their own Simulcast Subsystem.

Public

Safety


Lets look at whole system l.jpg

HEC Dispatch KHz

Simulcast Prime Site

Simulcast Prime Site

HEC Master Site

Simulcast Prime Site

Simulcast Prime Site

Lets Look at Whole System

PublicWorks

F4

Public

Safety

F3

F2

F1


How about radio coverage l.jpg
How About Radio Coverage? KHz

  • What are the key drivers?

    • Service area and types of coverage – were defined by the City’s project team including Police, Fire, PW&E and HAS

      • Mobile coverage (vehicle radios)

      • Portable radios on-street

      • Portable radios in 10 dB buildings (light buildings, typically residential)

      • Portable radios in 20 dB buildings (typically medium to heavy buildings)

      • Portable radios in 30 dB buildings (typically heavier buildings, but not all heavy buildings)

      • “Required Buildings” – a list of 147 buildings developed by the City, in which the Vendor must provide coverage

      • Downtown tunnel system

      • Medical Center tunnel system


How about radio coverage36 l.jpg
How About Radio Coverage? KHz

  • What are the key drivers?

    • Coverage reliability – Selected 95% Area Reliability

    • Delivered audio quality (sound quality) – Selected TIA DAQ 3.4 as the baseline minimum

    • Location of portable radio on the user – radio at belt level with antenna on the radio

    • Belt clip carrying device for the portable radio

    • Coverage with the radios stationary and moving

    • Coverage acceptance testing


How about radio coverage37 l.jpg
How About Radio Coverage? KHz

  • The RFP requires 95% coverage of the City’s service area with a Delivered Audio Quality (DAQ) of 3.4, based on the following scale.


Level 5 interoperability l.jpg
Level 5 Interoperability KHz

  • The City expects to have Level 5 Interoperability, standards based shared systems with all of the adjacent 700 / 800 MHz radio systems in the area, as defined by the SAFECOM Interoperability Continuum on the next slide.



How about interoperability l.jpg
How About Interoperability? KHz

  • There are currently two separate Harris County Regional Radio Systems in place today:

    1. A newer ASTRO 25 system – platform for the future

    2. An older SmartZone 4.1 system - has most system users

  • Successful proposers will need to provide solutions to interoperate with both of these systems


Vendor demos l.jpg
Vendor Demos KHz

  • Three days set aside for “Demonstrations and Discussions”

  • Locations to be identified by Vendors

  • Tyco: week of March 10-14

  • Motorola: week of March 17-21


Vendor demos42 l.jpg
Vendor Demos KHz

  • Two areas to be set up

    • Area for or evaluation committee, technical workgroup, strategic purchasing, and RCC to interact with Vendor

    • Area for hands-on evaluation of dispatch consoles and subscriber equipment

  • City will stream a cross-section of City users and staff through the hands-on area over the three days


Vendor demos outline l.jpg
Vendor Demos Outline KHz

  • City Team introductions and guidance for the session

  • Introduction of Vendor’s presentation team

  • Vendor presentation of session agenda

  • Brief overview of Proposer’s company (15 minutes)

  • Overview and discussion of Proposed Primary System Infrastructure Offering (incorporate demonstration of equipment as appropriate!)

    • Type of system and system configuration

    • Rationale for the selection of proposed repeater sites

    • Rationale for proposed system capacity

    • Ability of Public Safety and Public Works to provide mutual backup capability

    • System expansion capability for future growth

    • Guaranteed radio coverage performance in all categories - including but not limited to the following:

    • Audio Quality Demonstrations for P25 Phase I and Phase II


Vendor demos outline44 l.jpg
Vendor Demos Outline KHz

  • Failure mode analysis (follow Appendix A to this outline)

  • Trunked System Features (follow Appendix B to this outline)

  • Voice Encryption Discussion

  • Microwave System Configuration and Connectivity

  • Network management system

  • Interoperability with external entities in the Houston area

  • Proposed Dispatch Console Systems

  • Infrastructure implementation and optimization

  • Site Development

  • Infrastructure Maintenance (discuss the team that will be involved in this aspect of the project)

  • Corrective Maintenance Alerting and Response Plan (before and after warranty)


Vendor demos outline45 l.jpg
Vendor Demos Outline KHz

  • Presentation and Demonstration of Proposed Primary System Subscriber Equipment (incorporate demonstration of equipment as indicated below)

    • Proposed Mobile Radios

    • Proposed Portable Radios and Accessories

    • Status of Proposed Radios

    • Proposed battery technology

  • Proposed System Pricing for Primary Offering

  • Discussion of Alternate Offerings

  • Vendor Specific Topics and Questions to be added at a later date.

  • System, Console, and Subscriber Equipment demos for City Staff

  • Close-Out of Vendor Demonstrations


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