Grant based physical uplink shared channel (PUSCH) transmission and configured grant based PUSCH transmission in new radio (NR) systems operating on unlicensed spectrum
Systems, methods, and apparatuses disclosed herein can operate on an unlicensed spectrum. These systems, methods, and apparatuses can perform a first listen-before-talk (LBT) operation of a LBT protocol in a first slot from among multiple slots to determine whether the unlicensed spectrum is unoccupied. Thereafter, these systems, methods, and apparatuses can transmit an uplink (UL) transmission in other slots from among the plurality of slots in response to the unlicensed spectrum being unoccupied. Otherwise, these systems, methods, and apparatuses can perform a second LBT operation in a second slot from among the plurality of slots in response to the unlicensed spectrum being occupied.
1. A method for operating on an unlicensed spectrum, the method comprising:
performing, by a user equipment (UE), a first listen-before-talk (LBT) operation of a LBT protocol in a first symbol from among a plurality of symbols of a first slot from among a plurality of slots to determine whether the unlicensed spectrum is unoccupied;
transmitting, by the UE, an uplink (UL) transmission starting from remaining symbols after the first symbol from among the plurality of symbols of the first slot in response to the first LBT operation determining the unlicensed spectrum is unoccupied;
performing, by the UE, a second LBT operation in a second symbol, after the first symbol, from among the plurality of symbols of the first slot in response to the first LBT operation determining the unlicensed spectrum is occupied;
puncturing, by the UE, the UL transmission in remaining symbols after the second symbol from among the plurality of symbols of the first slot in response to the second LBT operation determining the unlicensed spectrum is unoccupied; and
transmitting, by the UE, the UL transmission starting from remaining symbols after the second symbol from among the plurality of symbols of the first slot in response to the second LBT operation determining the unlicensed spectrum is unoccupied.
2. The method of claim 1 , further comprising:
performing, by the UE, a third LBT operation in a third symbol from among the plurality of symbols in response to the first LBT operation determining and the second LBT operation determining the unlicensed spectrum is occupied.
3. The method of claim 1 , wherein the UL transmission comprises a grant based physical uplink shared channel (GB PUSCH) transmission.
4. The method of claim 1 , wherein the transmitting starting from the remaining symbols after the first symbol comprises determining, by the UE, a start position of the UL transmission in terms of an offset on the first symbol.
5. A user equipment (UE), comprising:
radio front end circuitry configured to perform wireless communication over an unlicensed spectrum;
processing circuitry configured to:
perform a first listen-before-talk (LBT) operation of a LBT protocol in a first symbol from among a plurality of symbols of a first slot from among a plurality of slots to determine whether the unlicensed spectrum is unoccupied,
transmit, using the radio front end circuitry, an uplink (UL) transmission starting from remaining symbols after the first symbol from among the plurality of symbols of the first slot in response to the first LBT operation determining the unlicensed spectrum is unoccupied,
perform a second LBT operation in a second symbol, after the first symbol, from among the plurality of symbols of the first slot in response to the first LBT operation determining the unlicensed spectrum is occupied,
puncture the UL transmission in remaining symbols after the second symbol from among the plurality of symbols of the first slot in response to the second LBT operation determining the unlicensed spectrum is unoccupied, and
transmit, using the radio front end circuitry, the UL transmission starting from the remaining symbols after the second symbol from among the plurality of symbols of the first slot in response to the second LBT operation determining the unlicensed spectrum is unoccupied.
6. The UE of claim 5 , wherein the processing circuitry is further configured to perform a third LBT operation in a third symbol from among the plurality of symbols in response to the first LBT operation determining and the second LBT operation determining the unlicensed spectrum is occupied.
7. The UE of claim 5 , wherein the UL transmission comprises a grant based physical uplink shared channel (GB PUSCH) transmission.
8. The UE of claim 5 , wherein the processing circuitry is configured to determine a start position of the UL transmission in terms of an offset on the first symbol.
9. A system for operating on an unlicensed spectrum, the system comprising:
a first user equipment (UE); and
a second UE configured to:
perform a first listen-before-talk (LBT) operation of a LBT protocol in a first symbol from among a plurality of symbols of a first slot from among a plurality of slots to determine whether the unlicensed spectrum is unoccupied,
transmit an uplink (UL) transmission starting from remaining symbols after the first symbol from among the plurality of symbols of the first slot in response to the first LBT operation determining the unlicensed spectrum is unoccupied,
perform a second LBT operation in a second symbol, after the first symbol, from among the plurality of symbols of the first slot in response to the first LBT operation determining the unlicensed spectrum is occupied,
puncture the UL transmission in remaining symbols after the second symbol from among the plurality of symbols of the first slot in response to the second LBT operation determining the unlicensed spectrum is unoccupied, and
transmit the UL transmission starting from the remaining symbols after the second symbol from among the plurality of symbols of the first slot in response to the second LBT operation determining the unlicensed spectrum is unoccupied.
10. The system of claim 9 , wherein the second UE is configured to perform a third LBT operation in a third symbol from among the plurality of symbols in response to the first LBT operation determining and the second LBT operation determining the unlicensed spectrum is occupied.
11. The system of claim 9 , wherein the UL transmission comprises a grant based physical uplink shared channel (GB PUSCH) transmission.
12. The method of claim 1 , wherein the performing the first LBT operation comprises performing the first LBT operation in symbol 0 of the first slot to determine whether the unlicensed spectrum is unoccupied, and
wherein the performing the second LBT operation comprises performing the second LBT operation in symbol 7 of the first slot in response to the first LBT operation determining the unlicensed spectrum is occupied.
13. The method of claim 12 , wherein the puncturing comprises puncturing the UL transmission in remaining 7 symbols after the symbol 7 of the first slot.
14. The method of claim 1 , further comprising receiving, by the UE, downlink control information (DCI) having a start symbol that indicates the first symbol in the first slot.
15. The UE of claim 5 , wherein the first symbol comprises symbol 0 of the first slot, and
wherein the second symbol comprises symbol 7 of the first slot.
16. The UE of claim 15 , wherein the remaining symbols after the second symbol comprises remaining 7 symbols after the symbol 7 of the first slot.
17. The UE of claim 5 , wherein the processing circuitry is further configured to receive downlink control information (DCI) having a start symbol that indicates the first symbol in the first slot.
18. The system of claim 9 , wherein the first symbol comprises symbol 0 of the first slot, and
wherein the second symbol comprises symbol 7 of the first slot.
19. The system of claim 18 , wherein the remaining symbols after the second symbol comprises remaining 7 symbols after the symbol 7 of the first slot.
20. The system of claim 9 , wherein the second UE is further configured to receive downlink control information (DCI) having a start symbol that indicates the first symbol in the first slot.