March 2019 1 Project 25 Technology Interest Group International Wireless and Communications Expo Las Vegas, Nevada March 7, 2019 Project 25 with LTE: Mission Critical PTT Interworking Standards in Development Presented by: PTIG - The Project 25 Technology Interest Group www.project25.org – Booth 2761
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March 20191Project 25 Technology Interest Group
International Wireless and Communications ExpoLas Vegas, Nevada
March 7, 2019
Project 25 with LTE: Mission Critical PTT Interworking Standards in
Development
Presented by:PTIG - The Project 25 Technology Interest Group
• FirstNet (LTE) – Public Safety Broadband Network
• Existing Radio System
• Existing Cellular Usage
• Government Users LTE Expectations
• Government Users LTE Initial Deployments
• Government Users LTE Challenges/Opportunities
• Government Users LMR/LTE Interworking
Overview & User Perspective
March 20199Project 25 Technology Interest Group
• Project 25 (P25) – Land Mobile Radio (LMR)
o Standard for the design and manufacture of interoperable digital two-way wireless communications products.
o Developed in North America with state, local and federal representatives and Telecommunications Industry Association (TIA) governance, P25 has gained worldwide acceptance for public safety, security, public service, and commercial applications
• Long Term Evolution (LTE) – Cellular
o Standard for wireless broadband communication for mobile devices and data terminals, based on the GSM/EDGE and UMTS/HSPA technologies.
o It increases the capacity and speed using a different radio interface together with core network improvements.
Overview
March 201910Project 25 Technology Interest Group
• FirstNet - Public Safety Broadband Network
o The First Responder Network Authority of the United States was created under the Middle Class Tax Relief and Job Creation Act of 2012 as an independent authority.
o FirstNet is a nationwide wireless broadband network being built for first responders.
o The First Responder Network Authority is the federal entity charged with overseeing the creation and delivery of the FirstNet network. It is housed within the Department of Commerce, National Telecommunications and Information Administration.
o AT&T was awarded the contract in April 2017 to build the LTE broadband network.
o The agency’s role is to ensure AT&T delivers on the terms of its contract and creates a network that meets the needs of public safety now and into the future.
Overview
March 201911Project 25 Technology Interest Group
• Government agencies rely on Land Mobile Radio (LMR) systems to support voice two-way radio communications for personnel in the field to communicate.
• Radio Systems are complex terrestrially-based, wireless communications systems. Not all radio systems are the same. The configuration of the radio system makes it unique. When developing a radio system there are many elements involved. However, some of the primary elements are:
oCapacity - # of talkpaths, # of devices, avg. length of conversation
o Frequency – VHF, UHF, 800 MHz, 700 MHz
oCoverage – street level, inside of buildings (density level) for jurisdiction
o Type – Conventional, trunked, single site, multi-site, analog, digital, encryption, local control, programming processes for interoperability
oReliability – the performance of the system under a stated condition for a specified period of time.
oCost – Original purchase price, plus, on-going operational and maintenance costs
Existing Radio System
March 201912Project 25 Technology Interest Group
• Government agencies utilize Cellular systems to augment existing forms of communication
• Mobile Data Terminals (MDT) – laptops in vehicles – NCIC Lookups
– Local Computer Aid Dispatch (CAD) Systems
– Access Shared Data Information
– Emails
– Internet
• Cell phones– Voice Calls
– Data transmissions
» Emails
» Internet
Existing Cellular Usage
March 201913Project 25 Technology Interest Group
• Reliability• Equal or better
• Coverage • Equal or better
• Cost• Less money or more services
• Capacity • Equal or better
• Frequency • Band 14 plus commercial bands
• Type • Local control & seamless transfer from carrier to carrier for interoperability
Government Users LTE Expectations
March 201914Project 25 Technology Interest Group
• Replacing existing MDT service provider equipment
• Interworking with existing P25 systems
• Increasing coverage for non-critical users regularly going outside of jurisdiction
• Increasing coverage gaps for non-critical users within existing systems
• Convergence of new devices (testing phase)
Government Users LTE Initial Deployments
March 201915Project 25 Technology Interest Group
• Overcoming, State and Local government agency contracts with carriers that are not AT&T(FirstNet), which currently indicate they have enhanced coverage.
• Since there are currently, no established standards or agreements for the following, they should be developed.
• cellular commercial carriers to ensure prioritized interoperability for critical public safety applications and access between carriers.
• cellular commercial carriers to ensure seamless access and transferring of data between carriers.
Government Users LTE Challenges/Opportunities
March 201916Project 25 Technology Interest Group
• LTE to operate between carriers for public safety mission critical broadband data
• LTE to operate between carriers & FirstNet for public safety mission critical broadband data
• LTE/FirstNet to develop interoperable capabilities with P25 systems
Government Users LMR/LTE Interworking
March 201917Project 25 Technology Interest Group
Government Users LMR/LTE Interworking
There is a place in Public Safety for LMR & LTE systemsUtilizing the best of both technologies
• TIA and ATIS Memorandum of Understanding dates back to 2006 in which the two SDOs “agree to jointly sponsor and work cooperatively in the development of joint standards documents that are of mutual interest”.
• ATIS – Alliance for Telecommunications Industry Solutions is a Standards Development Organization (SDO) develops technical and operational standards and solutions for the ICT (Information and Communication Technologies) industry (members include manufacturers and user agencies such as APCO)
• TIA – Telecommunications Industry Association is a Standards Development Organization (SDO) that develops voluntary, consensus-based industry standards for a wide variety of ICT products (members include manufacturers and P.S. Agency reps)
ATIS and TIA Background (1 of 2)
March 201932Project 25 Technology Interest Group
• TIA and ATIS began work on interworking of LTE Mission Critical (MC) and LMR services in 2012
• Joint Project Committee known as “JLMRLTE”
• This included Tetra, P25 Conventional, P25 Trunking and TIA-603 based Conventional Analog FM service
• In 2014 , the JLMRLTE agreed to “postpone further work in JLMRLTE until the LTE part of MCPTT work in 3GPP is more developed”
• In 2015 work resumed that created documents defining kLMRterminology and high level service descriptions
• Provided to 3GPP in 2016
• In December 2017, JLMRLTE work resumed
• Primary participants are 3GPP member representatives, TIA member representatives, Firstnet, AT&T
ATIS and TIA Background (2 of 2)
March 201933Project 25 Technology Interest Group
• Current ATIS Issue statement (WTSC-JLMRLTE-2017-00001R001) excerpt:
This issue statement proposes that ATIS WTSC (SN and RAN) initiate work with TIA TR-8 (TR-8.8 subcommittee) to develop joint ATIS/TIA specification(s), with ATIS as the lead Standards Development Organization (SDO).
Joint ATIS/TIA specification(s) on Use Cases, requirements, architecture, call/message flows, and implementation guidelines would be developed that define interworking of standard interfaces for published or future TIA LMR standards to the 3GPP interworking specifications. The JPC shall coordinate with 3GPP and TIA committees to identify and address gaps and evolve those standards as necessary. in support of this issue. As application and service protocols evolve, the work should accommodate, in so far as is possible, interoperation of new broadband public safety features with new features of TIA-102 and TIA-603 conventional FM systems.
ATIS/TIA JLMRLTE Status (1 of 7)
March 201934Project 25 Technology Interest Group
• Current work item WTSC-JLMRLTE-2019-00001R001 title:
• “Study of Interworking between P25 LMR and 3GPP (MCPTT) Mission Critical Services”
• Scope excerpt:
This document contains scenarios and considerations for the use of a 3GPP
Release 15 Interworking Function to enable interoperability of services
between a 3GPP MC system and a TIA-based LMR system. For the purposes
of this document there are three distinct TIA-based LMR systems that will be
examined, namely: P25 trunking, P25 conventional, and TIA-603 analog
conventional FM.
NOTE: This document is intended to describe how that 3GPP Interworking Function
may be used to enable interoperability of those services that are common
between 3GPP MC systems and each of the three TIA-based LMR systems
mentioned above. Interoperability of services between 3GPP MC systems and
TETRA-based LMR systems are outside the scope of this document.
ATIS/TIA JLMRLTE Status (2 of 7)
March 201935Project 25 Technology Interest Group
• 3GPP Release 15 and 16 documents define:
• Interconnection of 3GPP LTE Mission Critical Systems
• Interworking between LTE and non-LTE Systems
• The 3GPP Interworking architecture defines an Interworking functional entity (IWF)
• Adapts LMR Systems to mission critical systems via the IWF interface and supports interworking between LMR systems and mission critical systems.
• From the 3GPP side, the IWF acts as another MC System
• From the LMR side, the IWF acts as another LMR System
• The IWF is the functional entity responsible for conversion of media and control signaling between LTE and LMR technologies
ATIS/TIA JLMRLTE Status (3 of 7)
March 201936Project 25 Technology Interest Group
• High level functional model found in the JLMRLTE document:
ATIS/TIA JLMRLTE Status (4 of 7)
MC serviceIWF
Conventional FMLMR system
IWF-1, IWF-2, IWF-3
L603
TIA-102 LMR system
L102C/L102T
L603 – TBD interface to Conventional analog FM system
L102C – TBD interface to P25 Conventional System
L102T – TBD interface to P25 Trunking System
IWF-1, -2, -3 – Interfaces to 3GPP Mission Critical (MC) System
Services
NOTE: IWF in this picture = LMR Interworking Gateway device(s) that
connect LMR and LTE standard interfaces to enable interoperability (orange box in previous deployment model slides)
March 201937Project 25 Technology Interest Group
• Current philosophy of the JLMRLTE document:
• Describe how common services (features) may interwork (interoperate)oDo not prescribe a particular LMR interfaces to the IWF although ISSI/DFSI
are likely candidates
oDo not prescribe specific 3GPP or TIA messages to or from the IWF
oDo not prescribe specific TIA devices that may interface with the IWF
• High level identification of message translations that are needed for interworking
• High level identification of media translations that are needed for interworking
• Identify issues “For Future Study (FFS)” that must be resolved
ATIS/TIA JLMRLTE Status (5 of 7)
March 201938Project 25 Technology Interest Group
• Current JLMRLTE document Table of Contents includes:
oArchitectural considerations and assumptions (active work)
oFunctional models (placeholder)
oAddressing (placeholder)
oDeployment models (placeholder)
oFeatures and scenarios (active work)
• Architectural considerations and assumptions section provides high level descriptions of how services operate
• Features and scenarios section provides descriptions and generic message flows for establishing, maintaining and terminating interworking services
ATIS/TIA JLMRLTE Status (6 of 7)
March 201939Project 25 Technology Interest Group
• ATIS intends to publish some form of the current working document in June 2019
• The completion level of the current document by June 2019 is TBD
• The level of detail (architecture level vs. protocol level) that ATIS will eventually provide is TBD
• The JLMRLTE has requested the submission of discussion papers from the participating members that are intended to further define the breadth and depth of documents to be produced by the JLMRLTE
• Standards work in 3GPP or TIA may be necessary to enable implementation of 3GPP LTE MC and TIA LMR service interworking defined by the JLMRLTE documentation