Data exchange performing process, involves simultaneously broadcasting blocking information of uplink on downlink of group channel, and broadcasting signal requesting concerned listener to establish data transmission request on downlink

摘要

The process involves broadcasting status information of an uplink (9) of a group channel on a downlink (8) of the channel, to authorize a data transmission upon a request of a broadcast listener (2) when the uplink is available. A blocking information of the uplink is broadcast simultaneously on the down link. A signal requesting the concerned listener to establish a data transmission request is broadcast on the down link. The listener is temporarily assigned with a dedicated channel by a network when a request is presented by the listener.