Methods of Determining Whether a Frequency Channel is Available for Data Transmission for a Communication Device

(canceled)

A method of determining whether a frequency channel is available for data transmission for a first communication device and a second communication device, comprising:

• dynamically selecting a time interval for determining whether the frequency channel is available for data transmission, wherein the selection of the time interval is performed by the first communication device,
• transmitting information regarding the time interval selected from the first communication device to the second communication device, and
• determining whether the frequency channel is available for data transmission, during the time interval selected, wherein the determination is performed by the first communication device and the second communication device.

A frequency channel determination device for determining whether a frequency channel is available for data transmission for a communication device, comprising

• a selection unit programmed to dynamically select a time interval for determining whether the frequency channel is available for data transmission for the communication device, and
• a determination unit programmed to determine whether the frequency channel is available for data transmission for the communication device, during the time interval selected.

33-40. (canceled)