Mechanisms to operate downlink wideband carrier in unlicensed band
Systems, devices, and techniques for listen-before-talk (LBT) operations in unlicensed spectrum are described. A described technique includes receiving, by a user equipment (UE), a downlink control information (DCI) message, the DCI message including available bandwidth information and a channel occupancy time (COT) duration, the available bandwidth information being associated with one or more LBT bandwidths of a bandwidth part (BWP) in unlicensed spectrum; receiving, by the UE, one or more physical downlink shared channel (PDSCH) transmissions in the BWP, during the COT duration; and processing the one or more PDSCH transmissions based on the available bandwidth information.
1. A method comprising:
receiving a downlink control information (DCI) message, wherein the DCI message comprises available bandwidth information and a channel occupancy time (COT) duration, wherein the available bandwidth information is associated with one or more listen-before-talk (LBT) bandwidths of a bandwidth part (BWP) in unlicensed spectrum;
receiving, in the BWP, one or more physical downlink shared channel (PDSCH) transmissions during the COT duration;
processing the one or more PDSCH transmissions based on the available bandwidth information; and
encoding data for a physical uplink shared channel (PUSCH) transmission using the BWP in its entirety including one or more available LBT bandwidths of the BWP and one or more unavailable LBT bandwidths of the BWP, wherein puncturing is applied to the one or more unavailable LBT bandwidths.
2. The method of claim 1 , wherein receiving the DCI message comprises receiving the DCI message over a group common physical downlink control channel (GC-PDCCH);
the method further comprising decoding at one or more PDCCH candidate locations within the BWP to locate the GC-PDCCH.
3. The method of claim 2 , wherein the decoding comprises decoding at the one or more PDCCH candidate locations during two or more monitoring occasions within the COT duration.
4. The method of claim 2 , wherein:
the DCI message comprises an indication of an available LBT bandwidth;
the DCI message is carried in a primary channel; and
receiving the one or more PDSCH transmissions during the COT uses the primary channel and the indication of the available LBT bandwidth.
5. The method of claim 2 , comprising:
determining a primary channel based on detecting a demodulation reference signal (DMRS) or decoding the GC-PDCCH, wherein:
receiving the one or more PDSCH transmissions during the COT uses the primary channel.
6. The method of claim 1 , wherein receiving the DCI message comprises receiving the DCI message over a group common physical downlink control channel (GC-PDCCH) in licensed spectrum.
7. The method of claim 1 , wherein the one or more PDSCH transmissions comprise a first PDSCH transmission and a second PDSCH transmission, wherein the first PDSCH transmission is encoded using the BWP in its entirety including one or more available LBT bandwidths of the BWP and one or more unavailable LBT bandwidths of the BWP, and wherein the second PDSCH transmission is encoded using the one or more available LBT bandwidths.
8. A baseband processor comprising memory storing instructions that, when executed by the baseband processor, cause the baseband processor to perform operations comprising:
receiving a downlink control information (DCI) message, wherein the DCI message comprises available bandwidth information and a channel occupancy time (COT) duration, wherein the available bandwidth information is associated with one or more listen-before-talk (LBT) bandwidths of a bandwidth part (BWP) in unlicensed spectrum;
receiving one or more physical downlink shared channel (PDSCH) transmissions in the BWP during the COT duration; and
processing the one or more PDSCH transmissions based on the available bandwidth information; and
encoding data for a physical uplink shared channel (PUSCH) transmission using the BWP in its entirety including one or more available LBT bandwidths of the BWP and one or more unavailable LBT bandwidths of the BWP, wherein puncturing is applied to the one or more unavailable LBT bandwidths.
9. The baseband processor of claim 8 , wherein receiving the DCI message comprises receiving the DCI message over a group common physical downlink control channel (GC-PDCCH);
the operations comprising decoding at one or more PDCCH candidate locations within the BWP to locate the GC-PDCCH.
10. The baseband processor of claim 9 , wherein the decoding comprises decoding at the one or more PDCCH candidate locations during two or more monitoring occasions within the COT duration.
11. The baseband processor of claim 9 , wherein the DCI message comprises an indication of an available LBT bandwidth, wherein the DCI message is carried in a primary channel.
12. The baseband processor of claim 9 , wherein the operations comprise:
determining a primary channel based on detecting a demodulation reference signal (DMRS) or decoding the GC-PDCCH.
13. The baseband processor of claim 8 , wherein receiving the DCI message comprises receiving the DCI message over a group common physical downlink control channel (GC-PDCCH) in licensed spectrum.
14. The baseband processor of claim 8 , wherein the one or more PDSCH transmissions comprise a first PDSCH transmission and a second PDSCH transmission, wherein the first PDSCH transmission is encoded using the BWP in its entirety including one or more available LBT bandwidths of the BWP and one or more unavailable LBT bandwidths of the BWP, and wherein the second PDSCH transmission is encoded using the one or more available LBT bandwidths.
15. An apparatus one or more processors and a memory storing instructions that, when executed by the one or more processors, cause the one or more processors to perform operations comprising:
performing a listen-before-talk (LBT) procedure on a plurality of LBT bandwidths of a bandwidth part (BWP) in an unlicensed spectrum to produce LBT outcomes;
selecting one or more LBT bandwidths of the plurality of LBT bandwidths based on the LBT outcomes;
transmitting a DCI message that indicates the selected one or more LBT bandwidths, wherein the DCI message comprises available bandwidth information and a channel occupancy time (COT) duration;
performing one or more physical downlink shared channel (PDSCH) transmissions in the one or more selected LBT bandwidths during the COT duration; and
decoding data for a physical uplink shared channel (PUSCH) transmission that was encoded using the BWP in its entirety including one or more available LBT bandwidths of the BWP and one or more unavailable LBT bandwidths of the BWP, wherein puncturing was applied to the one or more unavailable LBT bandwidths.
16. The apparatus of claim 15 , wherein transmitting the DCI message comprises transmitting the DCI message over a group common physical downlink control channel (GC-PDCCH) in a primary channel;
wherein the operations comprise transmitting the DCI message over the GC-PDCCH two or more times during the COT duration.
17. The apparatus of claim 15 , wherein transmitting the DCI message comprises transmitting the DCI message over a group common physical downlink control channel (GC-PDCCH) in licensed spectrum.
18. The apparatus of claim 15 , wherein the one or more PDSCH transmissions comprise a first PDSCH transmission and a second PDSCH transmission, wherein the first PDSCH transmission is encoded using the BWP in its entirety including one or more available LBT bandwidths of the BWP and one or more unavailable LBT bandwidths of the BWP such that puncturing is applied to the one or more unavailable LBT bandwidths, and wherein the second PDSCH transmission is encoded using the one or more available LBT bandwidths.