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Future PTT Harmony Through P25 LMR-LTE Interworking

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

Andy Davis  (Senior Resource Manager, Motorola Solutions)

Brad Stoddard  (Director Michigan's Public Safety Communications System (MPSCS) and SWIC, State of Michigan)

Jeremy Elder  (Director of Product Management, L3Harris)

Pass Type: All Access

Track: Interoperability, LMR

Format: Panel Session

Vault Recording: TBD

Project 25 has over 3000 systems on the air today offering Public Safety Grade PTT communications to government agencies nationwide. As the new First-Net Broadband data system continues to roll out; many question what type of Mission Critical PTT interoperability and sharing will be available between the two systems.

The session begins with a Whitepaper by SAFECOM/NCSWIC that details LMR LTE Interworking on the air today in multiple P25 Systems. Many agencies have experimented with different ways to utilize LMR/LTE. See examples from interviews with practitioners across the country.

Then the latest 2023 update for LMR LTE Interworking Standards from the TIA TR-8.8 subcommittee (responsible for P25 Standards) and The Alliance for Telecommunications Industry Solutions (ATIS) will be presented. This Working Group is developing guidelines for MCPTT inter-working between P25 LMR and LTE systems. A study document includes 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). Multiple LMR systems are examined: P25 Trunking, P25 Conventional, and TIA-603 analog Conventional FM. The P25 Inter Sub System Interface (ISSI/CSSI) is the TIA recommended interface for P25 LMR. See the P25 Standards documents updates that facilitate interworking with the IWF.

Learn about User considerations for extending existing P25 systems with LMR/LTE Interworking. This will include: Supported feature-sets from P25 (ISSI/CSSI/etc), as well as Encryption, User device, & Cybersecurity considerations. An Q&A period will follow.