Method and apparatus for performing wireless communication in unlicensed band
Provided are a method and a device performing wireless communication in an unlicensed band, which receives information on allocating a radio resource in a system bandwidth made up of a plurality of subbands, receives information on a LBT (Listen Before Talk) failure region among the radio resource, and receives a downlink signal in other regions in the radio resource, except the LBT failure region.
1. A wireless device, comprising:
a transmitter;
a receiver; and
a controller which controls one or more of the transmitter and the receiver to:
receive, from a base station, configuration information about a plurality of subbands in an unlicensed band; and
receive, from the base station, downlink control information (DCI) including a bitmap,
wherein each bit in the bitmap indicates an availability or unavailability for a reception in a corresponding subband,
wherein based on the bitmap indicating at least one subband as available for the reception, the wireless device is able to receive a downlink signal from the base station,
wherein based on that all subbands in the bitmap are determined as unavailable for the reception, the wireless device does not receive a channel state information reference signal (CSI-RS), and
wherein the DCI further includes information indicating whether a listen before talk (LBT) succeeds for each of the plurality of subbands.
2. The wireless device of claim 1 , wherein the DCI is scrambled with a Radio Network Temporary Identifier (RNTI) commonly applied to a plurality of wireless devices which access a same control resource set (CORESET) and received through a group common physical downlink control channel (PDCCH).
3. The wireless device of claim 1 ,
wherein the controller is configured to further control the receiver to: receive information on a guard band, and
wherein the guard band includes one or more resource blocks (RBs).
4. The wireless device of claim 1 , wherein each subband includes a plurality of resource blocks (RBs).
5. The wireless device of claim 1 , wherein before receiving the downlink signal, a listen before talk (LBT) is performed by the base station.
6. An apparatus for a wireless device, comprising:
a controller which controls one or more of a transmitter and a receiver of the wireless device to:
receive, from a base station, configuration information about a plurality of subbands in an unlicensed band; and
receive, from the base station, downlink control information (DCI) including a bitmap,
wherein each bit in the bitmap indicates an availability or unavailability for a reception in a corresponding subband,
wherein based on the bitmap indicating at least one subband as available for the reception, the wireless device is able to receive a downlink signal from the base station,
wherein based on that all subbands in the bitmap are determined as unavailable for the reception, the wireless device does not receive a channel state information reference signal (CSI-RS), and
wherein the DCI further includes information indicating whether a listen before talk (LBT) succeeds for each of the plurality of subbands.
7. The apparatus of claim 6 , wherein the DCI is scrambled with a Radio Network Temporary Identifier (RNTI) commonly applied to a plurality of wireless devices which access a same control resource set (CORESET) and received through a group common physical downlink control channel (PDCCH).
8. The apparatus of claim 6 , wherein each subband includes a plurality of resource blocks (RBs).
9. The apparatus of claim 6 , wherein before receiving the downlink signal, a listen before talk (LBT) is performed by the base station.
10. A base station, comprising:
a transmitter;
a receiver; and
a controller which controls one or more of the transmitter and receiver to:
transmit, to a wireless device, configuration information about a plurality of subbands in an unlicensed band; and
transmit, to the wireless device, downlink control information (DCI) including a bitmap,
wherein each bit in the bitmap indicates an availability or unavailability for a reception in a corresponding subband,
wherein based on the bitmap indicating at least one subband as available for the reception, the wireless device is able to receive a downlink signal from the base station,
wherein based on that all subbands in the bitmap are determined as unavailable for the reception, the wireless device does not receive a channel state information reference signal (CSI-RS), and
wherein the DCI further includes information indicating whether a listen before talk (LBT) succeeds for each of the plurality of subbands.
11. The base station of claim 10 , wherein the DCI is scrambled with a Radio Network Temporary Identifier (RNTI) commonly applied to a plurality of wireless devices which access a same control resource set (CORESET) and received through a group common physical downlink control channel (PDCCH).
12. The base station of claim 10 , wherein each subband includes a plurality of resource blocks (RBs).
13. The base station of claim 10 , wherein before receiving the downlink signal, the base station performs a listen before talk (LBT).