A method and system for radio communication comprise a base station and terminal stations communicating with each other through the base station. Each terminal station has a terminal identifier and belongs to a group of terminal stations. Each group has a group identifier. The base station and/or each terminal station stores combinations of terminal identifiers and group identifiers. A first terminal station, in a predetermined mode, transmits a first communication, its terminal identifier and a mode identifier associated with the predetermined mode to the base station. The base station and/or terminal stations other than the first terminal station determine, based on the received mode identifier and the stored combinations of terminal identifiers and group identifiers, a specific group identifier and all terminal identifiers having this group identifier. Said other terminal stations having terminal identifiers having the specific group identifier stored in said combinations, output a second communication.