direct mode in a wireless anrufinformationaufzeichnung kommunikationseinheit after the tetra standard

摘要

A wireless direct mode communication unit (200), capable of communication with a number of second communication unit(s), comprising a transceiver for transmitting and/or receiving communications to/from said second communication unit(s), a signal processing function (208), operably coupled to or comprising a recording function (216, 234), recording communication events between the wireless direct mode communication unit (200) and said second communication unit(s). A method of recording communication events is also provided. In this manner, it is possible to track a performance of a direct mode communication unit, and messages sent to and/or received from it. In particular, it is possible to utilise the recorded information to re-enact an incident at a later time and/or identify how a communication unit/user reacted to a given scenario in a DMO communication system.