Granted Patent B2

US 8,369,844 · App. 12/600,691 · Granted Feb 5, 2013

Abstract

Claims (65)

1. 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.

2. A device as claimed in claim 1 , wherein said first transmission controller includes:

a timer for timing a period of time said detecting of the amount of energy has been performed, and

a comparator for comparing said timed period with a failure threshold, said comparator being arranged to output a transmission failed signal in case said timed period exceeds said failure threshold.

3. A device as claimed in claim 1 , wherein said transmitter is arranged to transmit remote control data to a remote controlled device.

4. A device as claimed in claim 1 , wherein said transmitter is arranged to transmit said data in a period of time of 10 ms or less.

5. A device as claimed in claim 1 , said transmitter having a data transmission rate of less than 2 Mb per second.

6. A device as claimed in claim 1 , wherein said device is compliant or compatible with the IEEE 802.15.4 standard.

7. An apparatus including a device as claimed in claim 1 .

8. A wideband wireless network, including:

a device as claimed in claim 1 ; and

at least one receiving device.

9. A device as claimed in claim 2 , wherein said transmitter is arranged to transmit remote control data to a remote controlled device.

10. A device as claimed in claim 2 , wherein said transmitter is arranged to transmit said data in a period of time of 10 ms or less.

11. A device as claimed in claim 3 , wherein said transmitter is arranged to transmit said data in a period of time of 10 ms or less.

12. A device as claimed in claim 2 , said transmitter having a data transmission rate of less than 2 Mb per second.

13. A device as claimed in claim 3 , said transmitter having a data transmission rate of less than 2 Mb per second.

14. The device of claim 1 , wherein the switch unit comprises hardware.

15. A method for transmitting data in a wideband wireless network, comprising:

controlling a transmitter to transmit data via a channel of said wideband wireless network, said transmitter being arranged to start said transmitting in response to a start signal, said controlling including:

controlling the transmitter by a first transmission controller, the controlling including: detecting the amount of energy in a frequency band corresponding to said channel;

comparing the detected amount of energy with an energy threshold;

outputting a continue signal in case said detected amount of energy exceeds said energy threshold;

continuing said detecting in response to said continue signal; and

outputting the start signal to said transmitter when said detected amount of energy is below said energy threshold; and

controlling the transmitter by a second transmission controller, the controlling including:

timing a period of time lapsed after the transmitter transmits data;

controlling the transmitter to retransmit said data when an acknowledgement of the transmission of data is not received within a predetermined period of time,

comparing a number of retransmissions with a failure threshold; and

outputting a transmission failed signal in case said number exceeds said failure threshold;

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.

16. The method of claim 15 , wherein the controlling by the second transmission controller comprises:

detecting the amount of energy in a frequency band corresponding to said channel;

comparing the detected amount of energy with an energy threshold; and

outputting the start signal to said transmitter when said detected amount of energy is below said energy threshold.

17. The method of claim 16 , wherein:

the detecting by the first transmission controller comprises detecting the amount of energy in the frequency band corresponding to said channel in a fully continuous manner during a time interval when the energy detection is performed; and

the detecting by the second transmission controller comprises taking a back-off period from further detecting based upon the detected amount of energy exceeding said energy threshold.

18. The method of claim 17 , wherein the taking comprises taking a random back-off period from further detecting.

19. The method of claim 17 , wherein the taking comprises taking a back-off period from further detecting, the back-off period increasing as the number of back-offs taken increases.

20. A non-transitory computer-readable medium comprising code portions for performing steps of a method for transmitting data in a wideband wireless network when run on a programmable apparatus, the steps comprising:

controlling a transmitter to transmit data via a channel of said wideband wireless network, said transmitter being arranged to start said transmitting in response to a start signal, said controlling including:

controlling the transmitter by a first transmission controller, the controlling including: detecting the amount of energy in a frequency band corresponding to said channel;

comparing the detected amount of energy with an energy threshold;

outputting a continue signal in case said detected amount of energy exceeds said energy threshold;

continuing said detecting in response to said continue signal; and outputting the start signal to said transmitter when said detected amount of energy is below said energy threshold; and

controlling the transmitter by a second transmission controller, the controlling including:

timing a period of time lapsed after the transmitter transmits data;

controlling the transmitter to retransmit said data when an acknowledgement of the transmission of data is not received within a predetermined period of time,

comparing a number of retransmissions with a failure threshold; and

outputting a transmission failed signal in case said number exceeds said failure threshold;

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.

Assignments (31)