Sub-band operations in unlicensed spectrums of new radio
Sub-band (SB) indications and listen-before-talk (LBT) outcomes may be used to adjust communications between devices such as wireless terminals and base stations. For example, a wireless terminal may receive SB indications including SB configurations and/or LBT outcomes of a base station, and other information such as a remapped CORESET. Similarly, a terminal may determine that a physical resource block (PRB) is invalid based at least in part on whether the PRB overlaps with a guard band. The terminal may be arranged to adjust its searches and transmissions based on received SB indications, and to provide the base station with LBT outcomes of the terminal.
1. An apparatus, comprising a processor, a memory, and communication circuitry, the apparatus being connected to a network via the communication circuitry, the apparatus further comprising computer-executable instructions stored in the memory which, when executed by the processor, cause the apparatus to:
receive, from a base station, downlink control information (DCI) comprising one or more bitmapped sub-band (SB) indications indicating one or more SB configurations;
perform measurements using a first channel state information-reference signal (CSI-RS) received in one or more orthogonal frequency division multiplexing (OFDM) symbols, wherein the first CSI-RS is received in a first channel successfully acquired by the base station; and
cancel reception of a second CSI-RS in one or more OFDM symbols, wherein the second CSI-RS reception falls outside the first channel successfully acquired by the base station.
2. The apparatus of claim 1 , wherein the instructions further cause the apparatus to determine whether the OFDM symbols are successfully acquired is based on the one or more bitmapped SB indications.
3. The apparatus of claim 1 , wherein the instructions further cause the apparatus to determine a listen-before-talk (LBT) type from a Random Access Response (RAR).
4. The apparatus of claim 1 , wherein the apparatus is a wireless transmit/receive unit (WTRU).
5. The apparatus of claim 4 , wherein the unavailable sub-band is an LBT sub-band that is indicated to be unavailable based on the LBT outcome of the base station.
6. The apparatus of claim 1 , wherein the one or more SB indications is associated with a resource block (RB), wherein the instructions further cause the apparatus to periodically receive new DCI, wherein one or more new DCI indicate a change in available sub-bands.
7. An apparatus, comprising a processor, a memory, and communication circuitry, the apparatus being connected to a network via the communication circuitry, the apparatus further comprising computer-executable instructions stored in the memory which, when executed by the processor, cause the apparatus to:
receive, from a base station, downlink control information (DCI) comprising one or more sub-band (SB) indications indicating one or more SB configurations; and
determine whether a first channel state information reference signal (CSI-RS) is canceled based on the DCI and at least in part on a second CSI RS, where sub-bands cross a boundary between an available and an unavailable listen-before-talk (LBT) sub-band.
8. The apparatus of claim 7 , wherein the instructions further cause the apparatus to determine that group of Physical Resource Blocks (PRBs) is invalid based at least in part on whether a PRB of the group of PRBs overlaps a guard band.
9. The apparatus of claim 7 , wherein the instructions further cause the apparatus to determine a listen-before-talk (LBT) type from a Random Access Response (RAR).
10. The apparatus of claim 7 , wherein the one or more SB indications is associated with a resource block (RB), wherein the unavailable sub-band is an LBT sub-band that is indicated to be unavailable based on the LBT outcome of the base station.
11. The apparatus of claim 7 , wherein the instructions further cause the apparatus to cancel Channel State Information Reference Signal (CSI-RS) in one or more Orthogonal Frequency Division Multiplexing (OFDM) symbols carrying CSI-RS that fall outside a channel successfully acquired by the base station.
12. A method comprising:
receiving, from a base station, downlink control information (DCI) comprising one or more bitmapped sub-band (SB) indications indicating one or more SB configurations; and
performing measurements using a first channel state information-reference signal (CSI-RS) received in one or more orthogonal frequency division multiplexing (OFDM) symbols, wherein the first CSI-RS is received in a first channel successfully acquired by the base station; and
canceling reception of a second CSI-RS in one or more OFDM symbols, wherein the second CSI-RS reception falls outside a second channel successfully acquired by the base station.
13. The method of claim 12 , further comprising whether the OFDM symbols are successfully acquired is based on the one or more bitmapped SB indications.
14. The method of claim 12 , further comprising determining a listen-before-talk (LBT) type from a Random Access Response (RAR).
15. The method of claim 12 , wherein the unavailable sub-band is an LBT sub-band that is indicated to be unavailable based on the LBT outcome of the base station.
16. The method of claim 12 , wherein the one or more SB indications is associated with a resource block (RB).
17. The method of claim 12 , further comprising periodically receiving new DCI, wherein one or more new DCI indicate a change in available sub-bands.
18. The method of claim 12 , wherein CSI-RS in one or more OFDM symbols indicated as not successfully acquired by the base station are not available.
19. The apparatus of claim 1 , wherein CSI-RS in one or more OFDM symbols indicated as not successfully acquired by the base station are not available.
20. The apparatus of claim 1 , wherein a SB configuration of the one or more SB configurations comprises an indication of frequency domain resources.