A pre-allocation grant schedule for communications between a wireless communication device (UE device) and a base station may be conducted according to requests made by the UE device. The UE device may provide information to a base station, requesting the base station to end a previous pre-allocation schedule and/or to start a new pre-allocation schedule. A request for stopping a previous pre-allocation schedule and starting a new pre-allocation schedule may be transmitted at the same time or in subsequent frames, respectively, depending on whether transition is from talk to non-talk mode or non-talk to talk mode. The base station may determine a pre-allocation schedule using the information received from the UE device, and may begin communicating uplink grants to the UE device according to the pre-allocation schedule requested by the UE device. The UE device may in turn may communicate with the base station according to the received uplink grants.