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What’s Going on Behind Wireless
Public Safety Solutions
WELCOME!
What’s Going on Behind Wireless
This presentation contains:
• Frequently used terms that are components of Wireless 911
• Wireless Call Flow Process
• Questions
Public Safety Solutions
What’s Going on Behind WirelessFrequently Used Terms
• HCAS – Hybrid Call-Path Associated Signaling
• NCAS – Non Call-Path Associated Signaling
Public Safety Solutions
Two Different Technologies:
What’s Going on Behind WirelessFrequently Used Terms
• 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.
Public Safety Solutions
What’s Going on Behind WirelessFrequently Used Terms
• 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.
Public Safety Solutions
What’s Going on Behind WirelessFrequently Used Terms
• 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.
Public Safety Solutions
What’s Going on Behind WirelessFrequently Used Terms
• 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.
Public Safety Solutions
What’s Going on Behind WirelessFrequently Used Terms
• 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.
Public Safety Solutions
What’s Going on Behind Wireless
Phase 0 (ZERO)
Public Safety Solutions
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.
Public Safety Solutions
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
What’s Going on Behind Wireless
Public Safety Solutions
What’s Going on Behind Wireless
Public Safety Solutions
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
What’s Going on Behind Wireless
Public Safety Solutions
Phase INCAS
What’s Going on Behind WirelessPHASE I NCAS
Phase I provides Voice, Callback Number, and Tower Location Information
911
Cell Tower
MobileSwitching
Center (MSC)
PSAP Trunks
ESRK/pANI IBM
911 Tandem(Selective Router)
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
What’s Going on Behind Wireless
Public Safety Solutions
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.
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What’s Going on Behind WirelessFrequently Used Terms(Phase II)
• PDE – Position Determining Equipment.
• 3 Types:• Handset Based
• Network Based
• Hybrid
Public Safety Solutions
What’s Going on Behind WirelessPHASE II NCAS
Phase I provides Voice, Callback Number, and Tower Location Information
911
Cell Tower
MobileSwitching
Center (MSC)
PSAP Trunks
ESRK/pANIIBM
911 Tandem(Selective Router)
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
What’s Going on Behind Wireless
QUESTIONS?
Public Safety Solutions
What’s Going on Behind Wireless
Public Safety Solutions