Transmission with restrictions in unlicensed spectrum
Systems, devices, and methods for operating in an unlicensed band are disclosed herein. In one example, a device may receive configuration information that includes a maximum channel occupancy time (MCOT) and a plurality of parameters including a plurality of transmission opportunity windows (TOWs). Based on the configuration information, the device may split a transmission into a plurality of bursts that may be grouped into sets of bursts based on how many bursts fit within a TOW. The number of bursts in a set of bursts may be less than or equal to the MCOT. The device may perform a clear channel assessment (CCA) to determine if the channel is busy and to determine a start time within the TOW for the bursts. The device may then transmit the set of bursts for that TOW, where each burst may have a burst indicator (BI).
1. A method implemented by a wireless transmit/receive unit (WTRU), the method comprising:
receiving downlink control information (DCI), wherein the DCI is associated with a set of resource allocations, and wherein the DCI indicates a number of time resources for each resource allocation of the set of resource allocations, a start time for the set of resource allocations, and a total number of resource allocations in the set of resource allocations;
determining that at least one time resource for at least one resource allocation of the set of resource allocations is unavailable for transmission; and
transmitting data via the set of resource allocations, wherein a subset of the number of time resources indicated via the DCI is used for transmission for the at least one resource allocation of the set of resource allocations.
2. The method of claim 1 , wherein the set of resource allocation is consecutive in time.
3. The method of claim 1 , wherein the number of time resources for each resource allocation comprises a number of symbols allocated for each resource allocation.
4. The method of claim 3 , wherein the subset of the number of time resources indicated via the DCI used for transmission for the at least one resource allocation of the set of resource allocations comprises a subset of symbols of the number of number of symbols allocated the at least one resource allocation.
5. The method of claim 3 , wherein the number of symbols corresponds to a number of orthogonal frequency division multiplexing (OFDM) symbols or a number of discrete Fourier transform spread OFDM (DFT-s-OFDM) symbols, and wherein the number of symbols allocated for each resource allocation are consecutive in time.
6. The method of claim 1 , wherein the data corresponds to a transport block, and wherein each resource allocation of the set of resource allocations is used for transmitting a transmission burst.
7. The method of claim 1 , wherein each resource allocation of the set of resource allocations is used for sending a respective repetition of a set of repetitions.
8. The method of claim 7 , wherein each repetition corresponds to a respective redundancy version of the data.
9. The method of claim 1 , wherein the set of resource allocations corresponds to a transmission opportunity window (TOW).
10. The method of claim 1 , wherein the subset of the number of time resources does not comprise the at least one time resource that is unavailable for transmission.
11. A wireless transmit/receive unit (WTRU) comprising:
a processor and a transmitter, wherein the processor and the transmitter are configured to:
receive downlink control information (DCI), wherein the DCI is associated with a set of resource allocations, and wherein the DCI indicates a number of time resources for each resource allocation of the set of resource allocations, a start time for the set of resource allocations, and a total number of resource allocations in the set of resource allocations;
determine that at least one time resource for at least one resource allocation of the set of resource allocations is unavailable for transmission; and
transmit data via the set of resource allocations, wherein a subset of the number of time resources indicated via the DCI is used for transmission for the at least one resource allocation of the set of resource allocations.
12. The WTRU of claim 11 , wherein the set of resource allocation is consecutive in time.
13. The WTRU of claim 11 , wherein the number of time resources for each resource allocation comprises a number of symbols allocated for each resource allocation.
14. The WTRU of claim 13 , wherein the subset of the number of time resources indicated via the DCI used for transmission for the at least one resource allocation of the set of resource allocations comprises a subset of symbols of the number of number of symbols allocated the at least one resource allocation.
15. The WTRU of claim 13 , wherein the number of symbols corresponds to a number of orthogonal frequency division multiplexing (OFDM) symbols or a number of discrete Fourier transform spread OFDM (DFT-s-OFDM) symbols, and wherein the number of symbols allocated for each resource allocation are consecutive in time.
16. The WTRU of claim 11 , wherein the data corresponds to a transport block, and wherein each resource allocation of the set of resource allocations is used for transmitting a transmission burst.
17. The WTRU of claim 11 , wherein each resource allocation of the set of resource allocations is used for sending a respective repetition of a set of repetitions.
18. The WTRU of claim 17 , wherein each repetition corresponds to a respective redundancy version of the data.
19. The WTRU of claim 11 , wherein the set of resource allocations corresponds to a transmission opportunity window (TOW).
20. The WTRU of claim 11 , wherein the subset of the number of time resources does not comprise the at least one time resource that is unavailable for transmission.