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P25 and LTE Standards for PTT Harmony: Update for 2022

Stephen Nichols  (Executive Director, Project 25 Technology Interest Group)

Andy Davis  (Senior Resource Manager, Motorola Solutions)

Jeremy Elder  (Director of Product Management for Systems Infrastructure, L3Harris)

Robin Grier  (President, Catalyst Communications)

Josh Lober  (President/CEO, ESChat)

Brad Stoddard  (Office of Michigan's Public Safety Communication System (MPSCS), Michigan Public Safety Communications System, SWIC)

Location: N260

Date: Thursday, March 24

Time: 2:30 pm - 3:45 pm

Track: Interoperability, Emergency Comms: LMR, LTE, 5G

Format: Short Course

Vault Recording: TBD

Project 25 has a large established base of over 3000 systems on the air today offering Public Safety Grade PTT communications to Public Safety and government agencies nationwide. As the new First-Net Broadband data system continues to roll out; many radio users and technologists question what type of Mission Critical PTT interoperability and sharing will be available between the two systems. The session will begin with a presentation of Public Safety User Expectations and real-world experience for PTT Interworking by a current Public Safety Communications System Manager. Then the latest 2022 update for LMR LTE Interworking Standards from the TIA TR-8.8 subcommittee (responsible for development of P25 Standards for Broadband Data Systems) and The Alliance for Telecommunications Industry Solutions ATIS will be presented. This Working Group is developing guidelines for MCPTT inter-working between P25 and LTE systems. A study document is in development that contains scenarios and considerations for the use of a 3GPP Interworking Function (IWF) to enable interoperability of common standard services between a 3GPP MC system and a TIA-based LMR system (P25). Three distinct TIA-based LMR systems are examined: P25 Trunking, P25 Conventional, and TIA-603 analog Conventional FM. Business Models of potential LMR/LTE Applications will be explored along with Public Safety User Expectations for PTT Operation and Interworking between the two services. An open Q&A period will be offered with the panel of experts.


1) What MCPTT Interworking functionality, features and call types can be available between P25 LMR and LTE.
2) What Business Models exist to create the Interworking Applications.
3) What are Public Safety Users Expectations and potential issues for the operation and interworking of the combined technologies.