Method for adjusting contention window size considering priority class in wireless access system supporting unlicensed band, and apparatus for supporting same
First Claim
1. A method for adjusting a contention window size (CWS) by a base station in a wireless access system supporting an unlicensed band, the method comprising:
- determining a plurality of CWSs, wherein each of the plurality of CWSs corresponds to a respective one of a plurality of priority classes;
performing channel access to the unlicensed band based on a specific CWS among the plurality of CWSs;
performing a downlink transmission related to the channel access to the unlicensed band based on the specific CWS, based on a determination that the unlicensed band is in an idle state as a result of the channel access to the unlicensed band; and
adjusting all of the plurality of CWSs, based on the occurrence of a triggering event for adjusting the specific CWS,wherein the triggering event is related to acknowledgement/non-acknowledgement information for the downlink transmission.
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Abstract
The present invention relates to a wireless access system supporting an unlicensed band, various methods for adjusting a contention window size, methods for performing a carrier sensing process in a single engine and a multi-engine, and an apparatus supporting the same. As one embodiment of the invention, a method for adjusting a contention window size (CWS) in a wireless access system supporting an unlicensed band may comprise: a step of setting a contention window size (CWS) necessary for performing a channel access process for each of priority classes; a step of performing a channel access process for a particular priority class in a channel in an unlicensed band on the basis of the set CWS; a step of performing a downlink transmission related to the particular priority class if it is determined that the channel in the unlicensed band is in an idle state as a result of the channel access process; and a step of making adjustments for all CWS'"'"' of priority classes if a triggering event, which relates to a downlink transmission and increases or reduces the CWS for the particular priority class, occurs.
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Citations
14 Claims
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1. A method for adjusting a contention window size (CWS) by a base station in a wireless access system supporting an unlicensed band, the method comprising:
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determining a plurality of CWSs, wherein each of the plurality of CWSs corresponds to a respective one of a plurality of priority classes; performing channel access to the unlicensed band based on a specific CWS among the plurality of CWSs; performing a downlink transmission related to the channel access to the unlicensed band based on the specific CWS, based on a determination that the unlicensed band is in an idle state as a result of the channel access to the unlicensed band; and adjusting all of the plurality of CWSs, based on the occurrence of a triggering event for adjusting the specific CWS, wherein the triggering event is related to acknowledgement/non-acknowledgement information for the downlink transmission. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A base station for adjusting a contention window size (CWS) in a wireless access system supporting an unlicensed band, the base station comprising:
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a transmitter; and a processor, operably coupled with the transmitter, and configured to support CWS adjustment, wherein the processor is further configured to; determine a plurality of CWSs, wherein each of the plurality of CWSs corresponds to a respective one of a plurality of priority classes perform channel access to the unlicensed band based on a specific CWS among the plurality of CWSs, perform a downlink transmission related to the channel access to the unlicensed band based on the specific CWS, based on determination that the unlicensed band is in an idle state as a result of the channel access to the unlicensed band, and adjust all of the plurality of CWSs, based on an occurrence of a triggering event for adjusting the specific CWS, wherein the triggering event is related to acknowledgement/non-acknowledgement information for the downlink transmission. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification