Method for transmitting and receiving data in wireless communication system using shared band, and device therefor

A method of receiving data by a receiving device in a wireless communication system using a shared band, the method comprising:

• receiving, from a transmitting device, present data in a first time period for present data transmission via the shared band;
• transmitting, to the transmitting device, acknowledgement information in response to the receiving the present data;
• transmitting a measurement value in allocated time slots, the time slots being capable of measuring information on whether a channel of the shared band is occupied;
• and
• receiving, from the transmitting device, next data,
• wherein a second time period for determining whether the channel of the shared band is occupied is determined based on a variable of a clear channel assessment (CCA) window,
• wherein a number of operations of CCAs is determined based on the variable of the CCA window,
• wherein the variable is determined based on the acknowledgment information and the measurement value,
• wherein the next data is received, if the channel of the shared band is not occupied,
• wherein the measurement value includes an energy measurement result for the shared band or an energy measurement result for the shared band in an idle period configured after transmitting present data by occupying the channel, and
• wherein if the transmitting device occupies a channel of the shared band, the measurement value includes at least one of an energy measurement result measured in two or more determined time slots, a number of successive identifications of a vacancy of the channel of the shared band, a channel occupation result of the shared band, a number of maintenances of the second time period according to an identification of the channel occupation of the shared band, and information on whether the channel is occupied at a predetermined time point.

A transmitting device for transmitting data in a wireless communication device using a shared band, the transmitting device comprising:

• a transceiver;
• and
• a processor configured to:
• control the transceiver to transmit present data in a first time period for present data transmission,
• allocate time slots capable of measuring information on whether a channel of the shared band is occupied,
• control the transceiver to receive a measurement value in the allocated time slots,
• determine a variable of a clear channel assessment (CCA) window, wherein a number of operations of CCAs is determined based on the variable of the CCA window,
• identify a second time period based on the variable,
• determine whether the channel of the shared band is occupied at the second time period, and
• control the transceiver to transmit next data, if the channel of the shared band is not occupied,
• wherein the variable is determined based on the measurement value and acknowledgment information, the acknowledgement information being received from at least two receiving devices in response to the present data transmission,
• wherein the measurement value includes an energy measurement result for the shared band at different time points or an energy measurement result for the shared band in an idle period configured after transmitting present data by occupying the channel, and
• wherein if the transmitting device occupies the channel, the measurement value includes at least one of an energy measurement result measured in two or more time slots, a number of successive identifications of a vacancy of the channel, a channel occupation result of the shared band, a number of maintenances of the second time period according to an identification of the channel occupation of the shared band, and information on whether the channel is occupied or not at a predetermined time point.

A receiving device for receiving data in a wireless communication system using a shared band, the receiving device comprising:

• a transceiver;
• and
• a processor configured to control the transceiver to:
• receive, from a transmitting device, present data in a first time period for present data transmission via the shared band,
• transmit, to the transmitting device, acknowledgement information in response to the receiving the present data,
• transmit a measurement value in allocated time slots, the time slots being capable of measuring information on whether a channel of the shared band is occupied, and
• receiving, from the transmitting device, next data,
• wherein a second time period for determining whether the channel of the shared band is occupied is determined based on a variable of a clear channel assessment (CCA) window,
• wherein a number of operations of CCAs is determined based on the variable of the CCA window,
• wherein the variable is determined based on the acknowledgment information and the measurement value,
• wherein the next data is received, if the channel of the shared band is not occupied,
• wherein the measurement value includes an energy measurement result for the shared band or an energy measurement result for the shared band in an idle period configured after transmitting present data by occupying the channel, and
• wherein if the transmitting device occupies a channel of the shared band, the measurement value includes at least one of an energy measurement result measured in two or more determined time slots, a number of successive identifications of a vacancy of the channel of the shared band, a channel occupation result of the shared band, a number of maintenances of the second time period according to an identification of the channel occupation of the shared band, and information on whether the channel is occupied or not at a predetermined time point.