Patent ID: 8369844

Claim:
A device for transmitting data in a wideband wireless network, comprising: a transmitter for transmitting data via a channel of said wideband wireless network, said transmitter being arranged to start said transmitting in response to a start signal; and a first transmission controller connected to said transmitter, for controlling transmission of data by said transmitter, said first transmission controller including: an energy detector for detecting the amount of energy in said channel, said energy detector being arranged to continue said detecting in response to a continue signal; a comparator connected to an output of said energy detector and to a control input of said transmitter, said comparator being arranged: to compare the detected amount of energy with an energy threshold; to output said continue signal to the energy detector in case said detected amount of energy exceeds said energy threshold; and to output said start signal to said transmitter when said detected amount of energy is below said energy threshold; a second transmission controller connected to said transmitter, said second transmission controller including: a reception detector for receiving a reception acknowledgement from a receiving device; a timer for timing a period of time lapsed after transmitting said data and controlling the transmitter to retransmit said data when said acknowledgement is not received within a predetermined period of time; and a retransmission counter for counting a number of retransmissions and a comparator for comparing said number with a failure threshold, said comparator being arranged to output a transmission failed signal in case said number exceeds said failure threshold; and a switch unit for activating said first transmission controller in response to said transmission failed signal from said second transmission controller and deactivating, in response to said transmission failed signal, said second transmission controller.