project 25 wireline standards update · p25 wireline interfaces documentation • current status...

Project 25 Wireline Standards Update

Roy McClellan

March 7, 2011 1

An EADS North American Company

Project 25 Technology Interest Group

Project 25 “Wireline” InterfacesFixedFixedSubscriber Data Subscriber Data

Peripheral Peripheral Interface Interface e.g. MDTe.g. MDT

Subscriber

Fixed Fixed SystemSystem

Interface Interface (FSI)(FSI)

Data InterfaceData Interfacee.g. Databasese.g. DatabasesGateway

SubscriberUnits

PSTN

Telephone Telephone Interconnect Interconnect

(PSTN)(PSTN)NetworkManagerManager

ConsolesRepeaters

Common Air Common Air Interface Interface

(CAI)(CAI)

Inter RF Inter RF SubSystemSubSystem

InterfaceInterfaceOther P25Systems

SystemConsoleConsole

SubSystemSubSystemInterface Interface

P25 RFSubSystem

(RFSS)

March 7, 2011 2

Interface Interface (ISSI)(ISSI)

Systems(CSSI)(CSSI)(RFSS)


What and how much documentation comprises a P25 Standard?comprises a P25 Standard?

• In general interfaces documentation consists of:O i d ib hi h l l i f i– Overview – describes high level interface requirements

– Protocol Document(s) – detailed technical descriptionM t h t d h t– Measurements – what and how to measure

– Performance – what to expect in the measurementsConformance did it do the job per the spec– Conformance – did it do the job per the spec

– Interoperability – does it work with other manufacturers– Compliance – existing tests deemed necessary for– Compliance – existing tests deemed necessary for assessing manufacturer interoperability by P25 CAP labs

Depending on the interface and it’s maturity and/or complexity

March 7, 2011 3

Depending on the interface and it s maturity and/or complexity, each of these documents may not be needed for all interfaces


P25 Wireline Interfaces DocumentationP25 Wireline Interfaces Documentation• Current status end of 2010

P25 Wireline Interface Label Conv Trunked Ovw M&P Meas Perf Conf Interop Comp

ISSI X X X X X X

SPECIFICATION DOCUMENT

E X X XISSI Supp Data X

ISSI Packet Data X

X X

X X X XCSSI Ec X

Eg X X X

X X X X

FSSI Ef X X

Telephone Interconnect Et X X X

X =Docs Exist =Planned =Developing

Several existing documents are currently under revision, adding additional material, or developing addendums

March 7, 2011 4

Conv = Conventional; Ovw = Overview; M&P = Measurements & Procedures (protocol); Meas = Measurements; Perf = Performance; Interop = Interoperability; Comp = Compliance Recommendations


P25 ISSI BenefitsP25 ISSI Benefits• Establish long term interoperability option

i h i hb i k dl f hwith neighboring networks, regardless of how they evolve and change

• Connectivity while maintaining autonomy

• Delivering Task Force Interoperabilityg p y

• DHS interoperability grant funding

• Support of mixed vendor backbones• Support of mixed vendor backbones

• Coverage extension

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P25 Network of Networks


P25 CSSI Benefits( l d )(protocol integrated into ISSI spec)

• P25 CSSI adds console connectivity &P25 CSSI adds console connectivity & interoperability to a P25 network

• Standard interface for basic console voice• Standard interface for basic console voice interoperability

S b i P25 f f i li• Supports basic P25 feature functionality

• Supports P25 console to console operations

• Supports conventional & trunked operations

L ISSI t l f l i t f t RFSS

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Leverages ISSI protocol for console interface to RFSS


P25 FSI BenefitsP25 FSI Benefits• Applies to conventional systems only

ll d l b• Allows a P25 digital base station repeater to be connected to a console using a standard

lprotocol– Also describes analog console to analog repeater connectivity

• Utilizes P25 ISSI RTP voice frames transport– Full rate IMBE vocoders – baseline & enhanced

Leverages ISSI protocol for P25 base station repeater to

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g p pconventional console Interface


P25 Telephone Interconnect Benefits• Facilitates PSTN interconnect

• Supports conventional & trunked operations• Supports conventional & trunked operations

• Features or characteristicsS pport for dialed digits & o erdialing– Support for dialed digits & overdialing

– Call setup and teardown messaging– Transcoding from P25 to PSTN voice requiredTranscoding from P25 to PSTN voice required

• Loss of end‐to‐end encryption– Call limit timer recommended

Limited deployment due to “telephone call” network loading

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P25 General Systems Model Focus on P25 ISSI Operationsp

P25 CompliantConsole Sub

System InterfaceISSI

Inter RF Sub-System Interface

P25 Compliant

Telephone Interconnect

pRF Sub System A

(Trunked RFSS)

Console Sub-System

System Interface ISSIISSI/CSSI

P25 CompliantRF Sub System B

(Trunked RFSS)

System

Fixed StationConventional

ConventionalFSI

Four P25 Wireline Interface Types

Trunked P25 Ph1 or Ph 2

CAI

Fixed Station FS

TO PSTN

FS

Telephone

ConventionalSystem

StationConventional P25 CAI1. Inter RF Sub-System Interface (ISSI)

2. Console Sub-System Interface (CSSI)3. Conventional Fixed Station Interface (FSI)

FS

Telephone Interconnect4. Telephone Interconnect

Three P25 Common Air Interface (CAI) Types1. Trunked P25 Phase 1 FDMA CAI

TO PSTN

March 7, 2011 9

Adopted from TIA-102.BACA-A, Page 28, § 2.1 Architecture Overview

2. Trunked P25 Phase 2 TDMA CAI3. Conventional P25 CAI


ISSI Architecture• The ISSI architecture is based on the concept of a “Home” and a “Serving” RFSS:– The “home” RFSS represents the home based location and radio

coverage area under which a particular talk group and/or individual operates. A “ i ” RFSS t f i l ti d di– A “serving” RFSS represents a foreign location and radio coverage area to which a talk group (or certain members of a talk group) and/or individual has roamed, and is away from the home‐based radio coverage areag

• ISSI TIA 102.BACA‐A Messages & Procedures– ISSI Messages and Procedures defines the basic ISSI protocol for

trunked voice and mobility management operationstrunked voice and mobility management operations– Based on SIP for session/call setup, control, and teardown– Uses RTP for transmission of P25 IMBE voice packets and PTT floor

control

March 7, 2011 10

control


P25 ISSI – Single Frequency BandISSI System B

NetworkSystem ANetwork

ISSI

Inter-RF Sub System InterfaceMulti-System

Console A Multi-

Selected system A & B users are members of Inter-System

Talk Group 4 (ISTG4)

MultiSystem

Console BAgency A: Art, Les, Andy, Roy, Jon

Agency B: Deb, Tom

Agency A“Art” Agency A:

Agency B“Deb”

Agency B

ISTG4

Agency A:“Andy”

Art Agency A:“John”Agency A:

“Andy”Agency A:

“Roy”

g y“Tom” Roam

•Users from Agencies A&B can roam and communicate anywhere in System A+B coverage area

•Both consoles monitor calls

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•Both consoles monitor calls•ISSI maintains End to End Encryption across the two systems


P25 ISSI – Multiband CoverageSystem DSystem C ISSI System DNetwork

System CNetwork

Multi-SystemC l D

Multi-System

Console C

Inter-RF Sub System Interface

Selected system A & B users are members of Inter-System

Talk Group 5 (ISTG5)

Console DAgency A: Art, Les, Andy, Roy, Jon

Agency B: Deb, Tom, Mike

System CCoverage Area System D

Coverage Area

Agency A

ISTG 5

Agency A:“Andy”

Agency A“Art”

Agency A:“John” Agency B

“Deb”Agency B

“Tom”Agency B

“Mike”

•Agencies on different RF Bands•The ISSI “glues” the networks together so that radios from different networks communicate as if they are on one network.

March 7, 2011 12

•Each network (& consoles) can monitor all the traffic simultaneously•Multi‐band operation allows multi‐band radios to roam between the networks


P25 Wireline Interfaces Summaryy• Interface interoperability standards

I t RF S b S t I t f ISSI– Inter‐RF Sub‐System Interface –ISSI– Console Sub‐System Interface – CSSIFixed Station Interface FSI– Fixed Station Interface ‐ FSI

– Telephone Interconnect

• Preserves basic P25 functionality beyond the• Preserves basic P25 functionality beyond the air interfaces

• Provides standard interconnections:• Provides standard interconnections:• Between P25 networks – including consoles• P25 networks to PSTN

March 7, 2011 13

P25 networks to PSTN


Currently Available TIA/APCO P25 Wi li St d d D tWireline Standards Documents

Project 25 Wireline Document TIA Published Document NOTES

ISSI Overview 102.BACC-A 102.BACC-B upgrade - in developmentpg pISSI Messages & Procedures (M&P) 102.BACA-A 102.BACA-A-3 addendum - in devlopmentISSI Measurement Methods 102.CACAISSI Performance Recommendations 102.CACBISSI Conformance 102.CACC 102.CACC-1 addendum - in developmentISSI Interoperability Testing 102.CACD-AISSI Recommended Compliance Test Procedures 102.CBBK-AISSI Recommended Compliance Test Procedures 102.CBBK A

102.BACD-A 102.BACD-B upgrade - in developmentalso requires 102.BACA-A

ISSI Supplementary Data Conformance 102.CACF in developmentISSI Capability Monitoring 102.BACA-A-2 Addendum to 102.BACA-A

CSSI O i (T k d & C ti l) 102 BABG

ISSI Supplementary Data M&P

CSSI Overview (Trunked & Conventional) 102.BABGCSSI Messages & Procedures - Trunked included in 102.BACA-ACSSI Messages & Procedures - Conventional 102.BACECSSI Measurement Methods - Trunked 102.CACA-1 Addendum to 102.CACACSSI Performance Recommendations - Trunked 102.CACB-1 Addendum to 102.CACBCSSI Conformance 102.CACCCSSI Interoperability Testing 102.CACD-ACSSI Recommended Compliance Test Procedures 102.CBBK-A

FSI Messages & Procedures 102.BAHA 102.BAHA-A upgrade - in developmentFSI Conformance 102.CADA

Telephone Interconnect Requirements & Definitions 102.BADA & 102 BADA-1

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Commercial Users – purchase from www.ihs.com or http://engineers.ihs.com/PS Users – available at no cost – contact the TIA at www.tiaonline.org

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