CSMA/CA in time and frequency domains

A communication device for transmitting a data packet in a wireless communication system, the communication device comprising means for:

• determining a first set of transmission parameters comprising a first central transmission frequency and a first spectral bandwidth;
• transmitting a first data packet by applying the first set of transmission parameters;
• determining whether or not the first data packet collided with a second data packet from a second communication device;
• determining a second set of transmission parameters, which in case of collision comprises a second central transmission frequency, and a second spectral bandwidth, which is different from the first spectral bandwidth with a first probability value, and the same as the first spectral bandwidth with a second probability value, the second probability value being equal to 1—the first probability value, the first probability value being non-zero unless the first spectral bandwidth is the minimum spectral bandwidth allowed in the communication system;
• and
• transmitting a second data packet by applying the second set of transmission parameters.