page_title: Terrestrial Trunked Radio
section_title: Cell improvable
hierarchical_section_title: Terrestrial Trunked Radio / Technical details / Cell selection / Cell improvable
context_page_description: Terrestrial Trunked Radio, a European standard for a trunked radio system, is a professional mobile radio and two-way transceiver specification. TETRA was specifically designed for use by government agencies, emergency services, for public safety networks, rail transport staff for train radios, transport services and the military. TETRA is the European version of trunked radio, similar to Project 25.
  TETRA is a European Telecommunications Standards Institute standard, first version published 1995; it is mentioned by the European Radiocommunications Committee.
context_section_description: The next diagram illustrates where a given TETRA radio cell becomes improvable. The serving cell becomes improvable when the following occurs: the C1 of the serving cell is below the value defined in the radio network parameter cell reselection parameters, slow reselect threshold for a period of 5 seconds, and the C1 or C2 of a neighbour cell exceeds the C1 of the serving cell by the value defined in the radio network parameter cell reselection parameters, slow reselect hysteresis for a period of 5 seconds.
caption: Cell improvable
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