A multiple mode data communication
system and method provides the flexibility to schedule
wireless unit transmissions and / or allow the
wireless unit to transmit autonomously. In certain embodiments, the
wireless units can transmit autonomously and / or use scheduling depending on the
data rate, the length of the data packet or the type of data. For example, the wireless units can transmit autonomously at lower data rates and use scheduling at higher data rates. Thus, the multiple mode
system enables wireless unit transmissions to be scheduled and / or be transmit autonomously, and wireless units can simultaneously operate in different scheduling and / or autonomous
modes. Depending on the embodiment, the
system can provide even greater flexibility in operation by permitting wireless units to be scheduled by a single
base station, scheduled by a multiplicity of base stations simultaneously or otherwise, via coordination between base stations, scheduled by a multiplicity of base stations in an uncoordinated and asynchronous manner, allowed to transmit autonomously, and / or allowed to transmit autonomously under
base station supervision (i.e.
rate control / adjustment by the
base station). Additionally, a forward and / or reverse link
control channel structure is provided which can be used to implement the multiple mode data communication system and / or support various features enabling increased
throughput over a shared
data channel in a wireless
communications system.