New Standard for P25 TDMA Control Channel Approved for Ballot
Friday, February 24, 2017 | Comments

The Project 25 (P25) Telecommunications Industry Association (TIA) TR-8 group is working to add a new standard for a TDMA control channel to P25 air interfaces. The standard, which was approved for ballot, provides the messages and procedures for operating a 12.5-kilohertz channel with two TDMA slots where either or both may service control channel traffic.

For wireline interfaces, the group approved for ballot an addendum to the Inter RF Subsystem Interface (ISSI) that expands the existing emergency alarm request message to indicate that the emergency alarm request has been generated by conditions other than depression of the emergency alarm button.

In the broadband realm, an addendum to TSB-88.3 was approved for publication. This addendum adds new broadband-to-narrowband interference scenarios.

Also completed during 2017 were revisions to the FDMA Common Air Interface (CAI) standard and FDMA CAI reserved values document, both addressing errata collected since the last publication, along with a revision to the trunking interoperability test standard that merges the FDMA and TDMA material and addresses an error in a call pre-emption test procedure.

The updates are based on activity from the TIA TR-8 standards meetings held Jan. 31 – Feb. 2 in Orlando, Florida. The next TIA TR-8 meeting will be held in Chicago in June 19 – 22.

The full P25 standards update document is available on the P25 Technology Interest Group (PTIG) website here.

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