Updates on P25 Security, Wireline Interfaces Among January Work
Tuesday, March 08, 2016 | Comments

The Project 25 (P25) Technology Interest Group highlighted work completed and in progress from the January P25 Telecommunications Industry Association (TIA) standards meeting. The document will be updated after every TR-8 face-to-face meeting scheduled to occur in 2016.

A revision of TSB-102 (TIA-102 Documentation Suite Revision C) was approved for publication. The revision reflects TR8 progress since the last publication (2012), including new TIA publications, improved graphics and identifying miscellaneous errata.

In addition, a revision to the FDMA, TDMA and analog air interface performance measurement method standards were approved for publication. These revisions will ensure that harmonics present in Class D amplifiers do not interfere with various audio measurements.

Finally, a revision of TSB-88.2-E (Wireless Communications Systems – Performance in Noise and Interference Limited Situations – Part 2: Propagation and Noise) was approved for publication. The revisions add information associated with broadband air interface propagation and noise modeling.

In the area of security, Link Layer Encryption is in progress. This is the first big new technology upgrade for improved security for all air interfaces of P25. It protects control channel control messages and hides group and individual IDs. An addendum to the Key Fill Interface standard is also in progress. This will enable Key Fill Device (KVL) interface to a KMF, an authentication facility and another KVL.

Specific to wireline interfaces, an addendum to the Inter RF Subsystem Interface (ISSI) messages and procedures standard is in progress. The revision corrects several errata that have been noted since the last publication. In addition, a revision to the Fixed Station Interface (FSI) standard is in progress. This revision adds additional capabilities, the most significant of which is packet data.

In the air interfaces standards, a revision to the FDMA Common Air Interface (CAI) is in progress. This revision addresses errata that have been collected since the last publication. A revision to the Trunking Interoperability Test Standard is in progress. This revision merges the FDMA and TDMA material and addresses an error in a call pre-emption test procedure. Also, a new standard for a TDMA control channel is in progress. This standard 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 broadband, additions to TSB-88 are in progress. These additions will create recommendations for broadband data system coverage modeling and verification.

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