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Project 25 Update Presented by: The Project 25 Technology Interest Group http://www.project25.org Copyright Project 25 Technology Interest Group Presentation Agenda • Project 25 Overview • Wireline Interfaces • Project 25 Work In Progress Copyright Project 25 Technology Interest Group Slide 2 Project 25 Overview Copyright Project 25 Technology Interest Group Project 25/TIA Standards Process Map User voice Industry voice Joint Participation P25 Steering Committee APIC: TIA-P25 Interface via MoU TIA TR-8 Committee P25 User Needs Committee APIC Task Groups TR-8 Committee Subcommittees User Needs Task Groups • Define requirements for standardization; • Adopt or reject TIA work • Only Users vote • Develops concept documents for P25 APIC Working Groups • Develops user requirements into standards proposals • Serves as venues for needed clarifications • Manages documents • All organizations get a vote Subcommittee Working Groups • Develop consensus standards with guidance from APIC and users • Only TR-8 members vote APIC: APCO Project 25 Interface Committee TIA: Telecommunications Industry Association Copyright Project 25 Technology Interest Group Slide 4 Project 25 Proposal Process TR8 Subcommittee Output Input Process is Iterative Proposal submitted to P25 Steering Committee P25 Steering Committee accepts, rejects, or requests modifications to proposal User Needs assists with requirements clarifications Working Document on proposal developed in APCO P25 Interface Committee or Task Group P25 Steering Committee Votes to move Working Document Forward to TIA (TR-8) TIA Standard ANSI Standard Requires 2/3 TIA approval approved. among voting All interested members. parties vote. Reviewed Reviewed every 5 years. every 5 years. ANSI approved. All interested parties vote. Reviewed every 5 years. TIA Bulletin TIA Standards can be upgraded to ANSI Standards via ANSI/TIA processes Copyright Project 25 Technology Interest Group Slide 5 Project 25 Document Designation • All Project 25 documents will carry a designation of TSB102XYYZ or TIA102XYYZ • Some documents are a TSB (Telecommunications System Bulletin) • Others are TIA (Telecommunications Industry Association) Standards • The four alpha characters following the 102 are designated: - - By the left most alpha character (X) • A Services Conventional, Trunked, Encrypted • B Systems Interface Standards • C Equipment Measurements and Specifications The next 2 alpha characters (YY) designate a particular feature within a category The last alpha character (Z) designates a particular standards document dealing with a feature • i.e. TIA102BACA ISSI Messages and Procedures Copyright Project 25 Technology Interest Group Slide 6 Benefits of Project 25 Standard • Project 25 Standard documents define seven specific interfaces, or connection points, of digital wireless systems. - Enables competing manufacturers to build products that interoperate across those interfaces - Enables agencies to procure interoperable Project 25 products, sub-systems, and systems from competing manufacturers. Copyright Project 25 Technology Interest Group Slide 7 Project 25 System Interfaces Subscriber Data Peripheral Interface e.g. MDT Fixed System Interface (FSI) Subscriber Units Data Interface e.g. Databases Gateway PSTN Telephone Interconnect (PSTN) Network Manager Common Air Interface (CAI) Repeaters Consoles System P25 RF SubSystem (RFSS) Inter RF SubSystem Interface (ISSI) Other P25 Systems Copyright Project 25 Technology Interest Group Console SubSystem Interface (CSSI) Slide 8 Project 25 RF SubSystem The RFSS or Radio Frequency Sub-System - is the heart of the system - provides for processing all calls • group, individual, PSTN - sets up command and control messages - routes voice and data packets - manages subscriber (group) databases - six of the seven standard interfaces connect to the RFSS Copyright Project 25 Technology Interest Group Slide 9 Project 25 Interfaces • Common Air Interface - CAI - (Um) –describes the wireless/over-the-air radio access among subscriber radios and between the subscriber radios and the fixed or base station radios • Inter RF Subsystem Interface – ISSI - (G) – describes the interface between systems, permitting users in one system to communicate with users in a different system for expanded coverage. • Fixed Station Interface – FSI - (Ef) –describes the conventional signaling and messages between the radio system and the fixed station by defining the voice and data packets and the command and control messages. • Console Subsystem Interface – CSSI - (Ec) –describes the signaling and messages between the radio system and the console, the position that a dispatcher or a supervisor would occupy to provide commands and support to the personnel in the field. The trunked console interface is part of the ISSI interface. Copyright Project 25 Technology Interest Group Slide 10 Project 25 Interfaces (cont.) • Subscriber data peripheral interface (A) –describes the data interface between the Project 25 radio and a data device • Data network interface (Ed) – describes the data interface between the Project 25 radio system and the external data network including connections to computers, data networks, external data sources, etc. • Telephone interconnect interface (Et) – describes the interface between the subscriber and the Public Switched Telephone Network (PSTN) to allow field personnel to make telephone calls. The use of this interface is dwindling due to (1) the availability of commercial cellular networks, and (2) the potential loading impact to the radio system if over used. (Future work) • Network Management Interface (En) – describes the interface to the radio system that allows administrators to control and monitor network fault management and network performance management. (Future work) Copyright Project 25 Technology Interest Group Slide 11 Common Air Interface Elements The Common Air Interface CAI integrates and combines all other aspects of the radio system such as Conventional & Trunking control, Encryption, Data, and Over-The-Air-Rekeying. Trunking Encryption Control Channel Trunking Signal Blocks Unit & Group Addressing Multi-algorithm Multi-key Encrypted Voice, Data, & Control CAI FDMA 12.5 kHz channels 9.6 kbps Talk Around Conventional Signal Blocks QPSK-c modulation FDMA channel access Unit & Group Addressing Error correction codes IMBE vocoder Conventional Over the Air Rekeying OTAR Data IP packets Integrated with Voice and Control Copyright Project 25 Technology Interest Group Slide 12 Project 25 FDMA Air Interface Aggregate Data Rate • Digital voice, 4400 bits/sec • Channel signaling, 2400 bits/sec • Error correction, 2800 bits/sec Composite signal, 9600 b/s Copyright Project 25 Technology Interest Group Slide 13 P25 Features (1) (per APCO P25 System and Standards Definition) Conventional Trunking Not Applicable Mandatory Mandatory Not Applicable Group Voice Call Standard Option Mandatory Individual Voice Call Standard Option Mandatory Pre-programmed Data Messaging Standard Option Standard Option Standard Option Standard Option Not Available Standard Option Affiliation Standard Option Standard Option Call Routing Standard Option Standard Option Encryption Update Standard Option Standard Option Registration Standard Option Mandatory Mandatory Mandatory Radio Unit Disable/Re-enable Optional Optional Call Statistics/Traffic Recording Optional Optional Teleservices Broadcast Voice Call Unaddressed Voice Call Services to the Subscriber Intra/Inter System Roaming Call Restriction Roaming Copyright Project 25 Technology Interest Group Slide 14 P25 Features (2) (per APCO P25 System and Standards Definition) Conventional Trunking Encryption Standard Option Standard Option Priority Call Not Available Standard Option Preemptive Priority Call Not Available Standard Option Call Interrupt Standard Option Standard Option Voice Telephone Interconnect Standard Option Standard Option Discreet Listening Standard Option Standard Option Silent Emergency Standard Option Standard Option Radio Unit Monitoring Standard Option Standard Option Talking Party Identification Standard Option Standard Option Call Alerting Standard Option Standard Option Circuit Switched Unreliable/Reliable Data Standard Option Standard Option Packet Switched Unreliable/Reliable Data Standard Option Standard Option Supplementary Services Bearer services Copyright Project 25 Technology Interest Group Slide 15 Project 25 “Phases” • “Phase 1” defines digital Common Air Interface FDMA work, using a 12.5 kHz channel • “Phase 2” defines additional digital Interfaces, TDMA or FDMA work, achieving 6.25 kHz channel equivalent efficiency • Note: Phase 2 also refers to P25 requirements developed supporting both Phase 1 and Phase 2 systems, such as the ISSI, Fixed Station, and Console interfaces Copyright Project 25 Technology Interest Group Slide 16 Wireline Interfaces Significant Progress in 2006-7 Copyright Project 25 Technology Interest Group ISSI, Fixed Station Subsystem Interface and Console SubSystem Interfaces SYSTEM 2 RFSS 1 ISSI SYSTEM 1 HLR/VLR RFSS 1 HLR/VLR Additional Conventional Coverage Area CSSI Console SubSystem FSSI ISSI Inter Sub System Interface FSSI Fixed Station Subsystem Interface (conventional interface) CSSI Console Sub System Interface HLR Home Location Register (manages home subscribers) VLR Visitor Location Register (manages visitor subscribers) RFSS Radio Frequency Sub System Copyright Project 25 Technology Interest Group Slide 18 Wireline Interface Scope definitions • ISSI - Scope 1 • Trunked Talkgroup call, Unit to Unit call (Individual), Mobility (Subscriber roaming) and Authentication - Scope 2 • Conventional, Data, OTAR (Over The Air Rekeying), Console across ISSI, Supplementary data (call alert, etc.) • Fixed Station Interface - Scope 1 • Voice & Station control for analog/P25 air interface supported over 4-wire (analog) and Ethernet (digital) transport between console and single fixed station. • Console Subsystem Interface - Scope 1 • Uses the Trunked ISSI features and incorporates Conventional ISSI features. Copyright Project 25 Technology Interest Group Slide 19 Wireline Standards Documentation Compliance Assessment Plan Overview Messages and Procedures Methods of Measure Performance Conformance Interop testing ISSI Scope 1 ISSI Scope 2 TBD CSSI Scope 1 CSSI Scope 2 TBD FSI Scope 1 FSI Scope 2 TBD TIA Published Balloting Developing Copyright Project 25 Technology Interest Group Next In Line Slide 20 ISSI Features • Authentication of roaming radios • Tracking current location of roaming radios - subscriber database management • • • • • Voice transport Project 25 addressing scheme Unit/Group Call setup & teardown Home-based PTT services to roaming radios PTT communications management among roaming and home-based radios Copyright Project 25 Technology Interest Group Slide 21 ISSI – Interconnecting Networks Users from Network A and B communicate using ISSI ISSI NETWORK A Talk Group A NETWORK B The ISSI is an all-IP system interface using SIP and RTP to achieve voice communications between Project 25 radio networks SIP = Session Initiation Protocol (call setup and tear down) Project 25 Technology Interest Group RTP = RealCopyright Time Transport Protocol (traffic bearer) Slide 22 ISSI - Coverage Extension Users from Network A roam into B and communicate using ISSI ISSI NETWORK A Talk Group B Copyright Project 25 Technology Interest Group NETWORK B Slide 23 ISSI Agency Interoperability - Roaming Network A user roams into Network B and using the ISSI communicates with Network B users or Network A NETWORK A Network A user can join talk groups with Network B users ISSI NETWORK B Network B user can join talk groups with Network A users or Network B Network B users roam into Network A and using the ISSI communicates with Network A users Copyright Project 25 Technology Interest Group Slide 24 Project 25 Activity… Work In Progress Copyright Project 25 Technology Interest Group Project 25 Work In Progress • User Requirements - Project 25 Statement Of Requirements (SOR) updates • Project 25 Interoperability - Document Updates - Trunking - Planning for Project 25 Compliance Assessment Program • Encryption - Document Updates - OTAR - Inter KMF Key Sharing • TDMA - Air Interface - Project 25 FDMA and TDMA Interoperability Copyright Project 25 Technology Interest Group Slide 26 Drivers for TDMA • FCC - Spectral Efficiency - 6.25 kHz efficiency ruling • 2-slot in 12.5kHz for 6.25 kHz efficiency • 4-slot in 25kHz for 6.25 kHz efficiency - Additional capacity needed, particularly in urban areas • • • • Smooth migration from FDMA to TDMA Backwards compatibility with FDMA TDMA coverage same as FDMA Improved audio quality Copyright Project 25 Technology Interest Group Slide 27 Project 25 TDMA – Attributes • Enhanced FDMA Control Channel - Updates to FDMA CCH to accommodate TDMA traffic channel control and assignment - Controls FDMA and TDMA subscriber units - Interoperability with FDMA for joint operations and migration - Preservation of FDMA subscriber investments • FDMA Conventional Direct mode - Option for TDMA subscribers when outside of coverage area • Two channels in 12.5 kHz or four channels in 25 kHz - Achieves FCC 6.25 kHz channel equivalent efficiency - Encryption interoperability (DES or AES) • Vocoders - Dual rate for FDMA interoperability - Accommodate enhanced vocoders for improved voice quality Copyright Project 25 Technology Interest Group Slide 28 TDMA Harmonization Work in process • 9.6 to 12 kbps air link rate for 2-slot TDMA • Modulation - Simulcast improvements for downlink modulation • Dual Rate Vocoder - Baseline Full Rate IMBE & Enhanced Half Rate IMBE • 30 msec slot size - Frame structures defined • Signaling improvements - Bidirectional for transmitting unit takeover • 4-slot TDMA work to follow Copyright Project 25 Technology Interest Group Slide 29 Thank You! PTIG Commercial Members: Aeroflex, Inc. BearCom Wireless Worldwide Bechtel Corporation Catalyst Communications Technologies CTA Communications Consulting Daniels Electronics Ltd. Datron World Communications Inc. Digital Voice Systems, Inc. EADS Public Safety Inc. EFJohnson Company Etherstack Ltd. Federal Engineering, Inc. General Dynamics Genesis Group Honeywell Batteries, Global Technology Systems, Inc. Icom America Kenwood Midland Radio Corporation Motorola, Inc. Pantel International Inc. RELM Wireless Corporation Tait Electronics - Radio Communications Technisonic Industries Ltd. Thales Communications Inc. TMC Radio Pty Ltd Tyco Electronics - M/A-COM Vertex Standard, Inc. Westel RF Technology Corporation Wireless Pacific Wulfsberg Electronics Zetron, Inc. Copyright Project 25 Technology Interest Group