Channel sensing in wireless communication system, transmission method based on same, and device therefor
According to one embodiment, the present invention relates to channel sensing in an unlicensed band in a wireless communication system, and a data transmission method based on the same, wherein the method is performed by a transmission node for transmitting data by performing the channel sensing and comprises the steps of: receiving a data transmission instruction from a control node; performing a channel sensing-related operation in at least one of channel sensing-related operation execution sections set prior to each of a plurality of transmission opportunity units allowed at the transmission node, according to the data transmission instruction; and transmitting data according to the data transmission instruction in the transmission opportunity unit corresponding to a specific channel sensing-related operation execution section, if it is determined that a channel for transmitting the data is in the unoccupied state in the specific channel sensing-related operation execution section, wherein a transmission priority is assigned to each of the plurality of transmission opportunity units, and the length of the channel sensing-related opportunity execution section set prior to each of the plurality of transmission opportunity units can be adjusted according to the transmission priority assigned to each transmission opportunity unit.
1. A method for a transmitting node to operate in an unlicensed band in a wireless communication system, the method comprising:
receiving a data transmission indication from a control node;
performing a channel sensing-related operation using a back-off counter value in at least one of channel sensing-related operation execution sections set prior to each of a plurality of transmission opportunity units allowed to the transmitting node according to the data transmission indication; and
performing a data transmission according to the data transmission indication in a transmission opportunity unit determined based on the back-off counter value,
wherein a transmission priority is assigned to each of the plurality of the transmission opportunity units,
wherein an offset, determined according to the transmission priority of a corresponding transmission opportunity unit, is added to the back-off counter value, and
wherein the at least one of the channel sensing-related operation execution sections set prior to each of the plurality of transmission opportunity units has a length being adjusted according to the transmission priority assigned to each of the plurality of the transmission opportunity units.
2. The method of claim 1 , wherein a length of a channel sensing-related operation execution section of a preceding transmission opportunity unit among the plurality of the transmission opportunity units is longer than a length of a channel sensing-related operation execution section of a following transmission opportunity unit.
3. The method of claim 1 , further comprising initializing the value of the back-off counter for the transmitting node with a predetermined value when the priority of the transmission opportunity unit corresponds to a predetermined value.
4. The method of claim 1 , wherein the channel sensing-related operation comprises at least one of an operation of performing back-off counter-based initial clear channel assessment (CCA), an operation of performing back-off counter-based extended CCA (ECCA), an operation of deferring transmission, or an operation of transmitting a reservation signal.
5. The method of claim 1 , further comprising transmitting a reservation signal when a back-off counter value becomes 0 in a channel sensing-related operation execution section set prior to one of the plurality of the transmission opportunity units,
wherein the reservation signal comprises information indicating a transmission opportunity unit among the plurality of the transmission opportunity units and that the reservation signal is for a data transmission for the indicated transmission opportunity unit.
6. A transmitting node configured to operate in an unlicensed band in a wireless communication system, the transmitting node comprising:
a transceiver; and
a processor configured to:
control the transceiver to receive a data transmission indication from a control node,
perform a channel sensing-related operation using a back-off counter value in at least one of channel sensing-related operation execution sections set prior to each of a plurality of transmission opportunity units allowed to the transmitting node according to the data transmission indication, and
perform a data transmission according to the data transmission indication in a transmission opportunity unit determined based on the back-off counter value,
wherein a transmission priority is assigned to each of the plurality of the transmission opportunity units,
wherein an offset, determined according to the transmission priority of a corresponding transmission opportunity unit, is added to the back-off counter value, and
wherein the at least one of the channel sensing-related operation execution sections set prior to each of the plurality of transmission opportunity units has a length being adjusted according to the transmission priority assigned to each of the plurality of the transmission opportunity units.
7. The transmitting node of claim 6 , wherein a length of a channel sensing-related operation execution section of a preceding transmission opportunity unit among the plurality of the transmission opportunity units is longer than a length of a channel sensing-related operation execution section of a following transmission opportunity unit.
8. The transmitting node of claim 6 , wherein the processor initializes the value of the back-off counter for the transmitting node with a predetermined value when the priority of the transmission opportunity unit corresponds to a predetermined value.
9. The transmitting node of claim 6 , wherein the channel sensing-related operation comprises at least one of an operation of performing back-off counter-based initial clear channel assessment (CCA), an operation of performing back-off counter-based extended CCA (ECCA), or operation of deferring transmission, and an operation of transmitting a reservation signal.
10. The transmitting node of claim 6 , wherein the processor controls the transceiver to transmit a reservation signal when a back-off counter value becomes 0 in a channel sensing-related operation execution section set prior to one of the plurality of the transmission opportunity units, and
wherein the reservation signal comprises information indicating a transmission opportunity unit among the plurality of the transmission opportunity units and that the reservation signal is for a data transmission for the indicated transmission opportunity unit.