Method for adjusting contention window size in wireless communication system supporting unlicensed band and device for supporting same
AssigneeLG Electronics Inc.
InventorsHanjun Park, Seonwook Kim, Joonkui Ahn
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Abstract
Disclosed in the present invention are: a method for controlling a contention window size (CWS) for uplink listen-before-talk (LBT) in a wireless communication system supporting an unlicensed band; and a device for supporting the same. More particularly, disclosed are a base station centric CWS controlling method, a terminal centric CWS controlling method, and devices for supporting the same.
Claims20
A method of controlling a contention window size (CWS) for uplink listen-before-talk (LBT) by a user equipment (UE) in a wireless communication system supporting an unlicensed band, the method comprising:
- receiving a downlink control signal in a first subframe from a base station (BS), the downlink control signal indicating the position of a first successfully received subframe of an uplink signal transmitted in an unlicensed band within a predetermined number of subframes from the first subframe, or the absence of any successfully received subframe of the uplink signal;
- when uplink transmission in the unlicensed band is skipped during a predetermined time, maintaining a CWS for uplink LBT by ignoring the received downlink control signal;
- and
- when the downlink control signal is re-received from the BS, performing uplink LBT for the uplink transmission in the unlicensed band on the basis of the maintained CWS, and performing the uplink transmission in the unlicensed band on the basis of a result of the uplink LBT.
A user equipment (UE) for controlling a contention window size (CWS) for uplink listen-before-talk (LBT) in a wireless communication system supporting an unlicensed band, the UE comprising:
- a transmitter;
- a receiver;
- and
- a processor operatively connected to the transmitter and the receiver,
- wherein the processor is configured to:
- receive a downlink control signal in a first subframe from a base station (BS), the downlink control signal indicating the position of a first successfully received subframe of an uplink signal transmitted in an unlicensed band within a predetermined number of subframes from the first subframe, or the absence of any successfully received subframe of the uplink signal,
- when uplink transmission in the unlicensed band is skipped during a predetermined time, maintain a CWS for uplink LBT by ignoring the received downlink control signal, and
- when the downlink control signal is re-received from the BS, perform uplink LBT for the uplink transmission in the unlicensed band on the basis of the maintained CWS, and performing the uplink transmission in the unlicensed band on the basis of a result of the uplink LBT.
Dependencies are inferred from the claim text.