Allocating speech items to mobile units communicating on a direct mode channel

A method and a mobile device, for assigning the voice one end of the is directly mode groove (DM) mobile device (RU1, RU2, RU3). The method, wherein during direct mode of mobile voice unit, one output end of the first mobile device (RU1) parallel active, a second movable unit (RU2) and a voice power, and mobile device for voice one during the ventilation channel mode, the output end of the second base unit (RU2) transmission. The method, guide, a mobile device on the direct current mode channel corresponding (RU1, RU2, RU3) and following way operation, wherein after the second base unit (RU2) voice one is finished, wherein the front mobile device on the direct current mode channel corresponding (RU3), the first mobile device (RU1 charges) and a switch, a voice one or wire is a voice power.