Transmitting data on a sub-band based on a first and a second LBT of sub-bands
A wireless device receives a grant scheduling a transmission on sub-bands of a physical uplink shared channel of a cell. The sub-bands comprise a first sub-band and one or more other sub-bands. The wireless device performs, in response to the grant: a first type listen-before-talk (LBT) on the first sub-band; and a second type LBT on each of the one or more other sub-bands. Data is transmitted on a sub-band of the sub-bands, based on a determination that: the first type LBT indicates that the first sub-band is clear; and the second type LBT indicates that each of the one or more other sub-bands are clear.
1. A method comprising:
receiving, by a wireless device, a grant scheduling a transmission on sub-bands of a physical uplink shared channel of a cell, wherein the sub-bands comprise a first sub-band and one or more other sub-bands;
performing, by the wireless device and in response to the grant:
a first type listen-before-talk (LBT) on the first sub-band; and
performing, after performing of the first type LBT and immediately before transmission on the first sub-band, a second type LBT on each of the one or more other sub-bands, wherein the first type LBT is LBT with back-off, and the second type LBT is LBT without back-off; and
transmitting data on a sub-band of the sub-bands, based on a determination that:
the first type LBT indicates that the first sub-band is clear; and
the second type LBT indicates that each of the one or more other sub-bands are clear.
2. The method of claim 1 , wherein:
a bandwidth part of the cell comprises the first sub-band and the one or more other sub-bands of the cell; and
the transmitting of the data comprises transmitting the data via the bandwidth part of the cell.
3. The method of claim 1 , wherein a first duration of the first type LBT is different from a second duration of the second type LBT.
4. The method of claim 3 , wherein the first duration of the first type LBT is variable and the second duration of the second type LBT is fixed.
5. The method of claim 1 , wherein:
a first duration of the first type LBT is different from a second duration of the second type LBT; and
the first duration of the first type LBT is variable and the second duration of the second type LBT is fixed.
6. The method of claim 1 , wherein:
the first type LBT is an LBT with random back-off parameters and a first LBT duration; and
the second type LBT is a one-shot LBT based on a one-shot LBT duration without a random back-off.
7. The method of claim 1 , wherein the second type LBT is performed based on the determination that the first type LBT indicates that the first sub-band is clear.
8. The method of claim 1 , further comprising:
determining that the second type LBT on one or more second sub-bands of a second cell, performed immediately before the transmission on the first sub-band, indicates that each of one or more second other sub-bands are clear; and
transmitting one or more second transport blocks via a second PUSCH of the second cell based on:
the determining that the first type LBT indicates that the first sub-band is clear; and
the determining that the second type LBT indicates that each of the one or more second sub-bands are clear.
9. The method of claim 1 , further comprising receiving an LBT parameter configuration message comprising at least one of:
a maximum energy detection threshold for at least one of the first type LBT or the second type LBT; or
an energy detection threshold offset for at least one of the first type LBT or the second type LBT.
10. A method comprising:
transmitting, by a base station, a grant scheduling a transmission on sub-bands of a physical downlink shared channel of a cell, wherein the sub-bands comprise a first sub-band and one or more other sub-bands;
performing, by the base station:
a first type listen-before-talk (LBT) on the first sub-band; and
a second type LBT on each of the one or more other sub-bands, wherein the first type LBT is LBT with back-off, and the second type LBT is LBT without back-off; and
transmitting data on a sub-band of the sub-bands, based on a determination that:
the first type LBT indicates that the first sub-band is clear; and
the second type LBT indicates that each of the one or more other sub-bands are clear.
11. The method of claim 10 , wherein:
a bandwidth part of the cell comprises the first sub-band and the one or more other sub-bands of the cell; and
the transmitting the data comprises transmitting the data via the bandwidth part of the cell.
12. The method of claim 10 , wherein a first duration of the first type LBT is different from a second duration of the second type LBT.
13. The method of claim 12 , wherein the first duration of the first type LBT is variable and the second duration of the second type LBT is fixed.
14. The method of claim 10 , wherein:
the first type LBT is an LBT with random back-off parameters and a first LBT duration; and
the second type LBT is a one-shot LBT based on a one-shot LBT duration without a random back-off.
15. The method of claim 10 , wherein the second type LBT is performed based on the determination that the first type LBT indicates that the first sub-band is clear.
16. The method of claim 10 , further comprising determining that the second type LBT on one or more second sub-bands of a second cell, performed immediately before the transmission on the first sub-band, indicates that each of the one or more second sub-bands are clear.
17. The method of claim 16 , further comprising transmitting one or more second transport blocks via a second PDSCH of the second cell based on:
the determining that the first type LBT indicates that the first sub-band is clear; and
the determining that the second type LBT indicates that each of the one or more second sub-bands are clear.
18. The method of claim 10 , wherein the performing the second type LBT on each of the one or more other sub-bands occurs after the first type LBT begins and before transmission on the first sub-band.
19. An apparatus for a wireless device, comprising:
a transceiver configured to receive, from a base station, a grant scheduling a transmission on sub-bands of a physical uplink shared channel of a cell, wherein the sub-bands comprise a first sub-band and one or more other sub-bands;
at least one processor coupled to the transceiver, the at least on processor being configured to:
perform, in response to the grant:
a first type listen-before-talk (LBT) on the first sub-band; and
perform, after performing of the first type LBT and immediately before transmission on the first sub-band, a second type LBT on each of the one or more other sub-bands, wherein the first type LBT is LBT with back-off, and the second type LBT is LBT without back-off; and
transmit data on a sub-band of the sub-bands, based on a determination that:
the first type LBT indicates that the first sub-band is clear; and
the second type LBT indicates that each of the one or more other sub-bands are clear.