Method for sharing reverse channel based on DO group telecommunication system

The method comprises: the speaking side in DO trunking communication system initiates a call; the scheduling sub-system builds a forward channel and one or more shared backward channel according to a certain strategy; the schedule sub-system sends the broadcast channel assignment message in each sector in the scheduling area through base station; after the users in idle non-speaking state in the sector receives the broadcasting channel assignment message, the scheduling sub-system calculates a shared backward channel that will be used by users according to the predetermined rule, and transfers the signals to said shared backward channel; when the non-speaking users need to use the shared backward channel to send signals, they start up the backward transmitting power and sends the backward signaling; after sending the signals the non-speaking users close the backward transmitting power.