What’s Going on Behind Wireless Public Safety Solutions WELCOME!

What’s Going on Behind Wireless

Public Safety Solutions

WELCOME!


This presentation contains:

• Frequently used terms that are components of Wireless 911

• Wireless Call Flow Process

• Questions


What’s Going on Behind WirelessFrequently Used Terms

• HCAS – Hybrid Call-Path Associated Signaling

• NCAS – Non Call-Path Associated Signaling


Two Different Technologies:


• MDN – Mobile Directory Number. “Callback” number of Cell Phone.

• pANI – pseudo ANI. • Sometimes Referred to as a “routing number”• A number used in wireless 911 call setup that can be

used to complete routing to a specific PSAP.• Two Kinds:

• ESRK – Emergency Services Routing Key. • ESRD – Emergency Services Routing Digit.



• MSC – Mobile Switching Center.• Wireless Carrier’s switch that provides

connectivity between mobile users on a wireless network, with the Public Switch Telephone Network (PSTN)

• One switch usually covers multiple geographic areas.



• S/R – Selective Router.• Also sometimes referred to as a “911 Tandem”

• The switch that routes the 911 call to the appropriate PSAP based on the Emergency Service Number (ESN)

• ESN – Emergency Service Number.• A three or four digit number that allows the S/R

to route a phone call to the appropriate PSAP.



• MF – Multi-Frequency Trunks.• A signaling code for communication from S/R

to PSAP using 8 digit ANI.

• EMF – Enhanced Multi-Frequency Trunks.• A signaling code for communication from S/R

to PSAP using 10 or 20 digit ANI.

• SS7 – Signaling System 7.• Type of signaling code used to communicate

from MSC to S/R.



• 3PDB – Third Party Database Provider.• A third party company that provides ALI

information.

• When the initial “dip” is sent from the PSAP to the SBC/ALISA database, that dip is then steered to the correct 3PDB which will return the actual ALI record.



Phase 0 (ZERO)


What’s Going on Behind WirelessPhase 0 (Zero)

• Equivalent to Wireline Basic 9-1-1.

• FCC minimum requirement of all wireless carriers.

• Provides voice only to designated PSAP.

• Usually routed via a 10-digit administrative line at the PSAP.


PHASE 0 (Zero)

911

Cell Tower

PSTN

PSAP

MobileSwitching

Center (MSC)

10 - Digit Number

PSAP Trunksor

Administrative Line

Provides a "Voice Only" Path for Emergency Call.No location information transmitted with the call.

IBM





Phase IHCAS

What’s Going on Behind WirelessPHASE I HCAS

Phase I provides Voice, Callback Number, and Tower Location Information

911

Cell TowerMobile

SwitchingCenter (MSC)

PSAP Trunks

ESRK/pANI + MDNIBM

911 Tandem(Selective Router)

MD

N

IDC

ALISA Database

ESRK/pANI +

MDN

ESNMDN

ALI Record

IBM

PSAP



Phase INCAS

What’s Going on Behind WirelessPHASE I NCAS


911

Cell Tower

MobileSwitching

Center (MSC)

PSAP Trunks

ESRK/pANI IBM


ES

RK

/pA

NI

IDC

ALISA Database

ESRK/pANI

ESN

ESRK/pANI

ALI Record

IBM

IBM

Third PartyDatabase Provider

(3PDB)

MD

N +

Tow

er I

nfor

mat

ion

ES

RK

/pA

NI

ESRK/pANI

ALI Record

PSAP



Phase IINCAS

What’s Going on Behind WirelessFrequently Used Terms(Phase II)• Latitude – Y coordinate.

• Distance from equator.

• Above equator = “+” (positive number)

• Below equator = “-” (negative number)

• Longitude – X coordinate.• Distance from Prime Meridian.

• East of Prime Meridian = “+” (positive number)

• West of Prime Meridian = “-” (negative number)

• MPC – Mobile Positioning Center.• Facility owned by the Wireless Carrier, or 3PDB that

uses Position Determining Equipment (PDE) to provide Latitude and Longitude of mobile caller.


What’s Going on Behind WirelessFrequently Used Terms(Phase II)

• PDE – Position Determining Equipment.

• 3 Types:• Handset Based

• Network Based

• Hybrid


What’s Going on Behind WirelessPHASE II NCAS


911

Cell Tower

MobileSwitching

Center (MSC)

PSAP Trunks

ESRK/pANIIBM


ES

RK

/pA

NI

IDC

ALISA DatabaseESRK/p

ANIESN

ESRK/pANI

ALI Record

IBM

IBM

Third PartyDatabase Provider

(3PDB)

MD

N +

To

we

r In

form

atio

n

ES

RK

/pA

NI

ESRK/pANI

ALI Record

IBM

MobilePositioning

Center(MPC)

Po

sitio

nin

g I

nfo

rma

tion

X / Y Cord.

PSAP


QUESTIONS?


What’s Going on Behind Wireless Public Safety Solutions WELCOME!

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