Contention window determination
A wireless device determines a reference duration for contention window adjustment. The reference duration is from a beginning of a channel occupancy and until an end of a first slot where at least one physical uplink shared channel (PUSCH) is transmitted. The wireless device determines a contention window value based on one or more new data indicators (NDIs) of one or more first transport blocks transmitted during the reference duration. The wireless device performs a listen before talk (LBT) procedure based on the contention window value. The wireless device transmits one or more second transport blocks based on the LBT procedure indicating a clear channel.
1. A method comprising:
determining, by a wireless device, a reference duration for contention window adjustment, wherein the reference duration is from a beginning of a channel occupancy and until an end of a first slot where at least one physical uplink shared channel (PUSCH) is transmitted;
determining a contention window value based on one or more new data indicators (NDIs) of one or more first transport blocks transmitted during the reference duration;
performing a listen before talk (LBT) procedure based on the contention window value; and
transmitting one or more second transport blocks based on the LBT procedure indicating a clear channel.
2. The method of claim 1 , wherein the beginning of the channel occupancy is a beginning of a channel occupancy of a first transmission burst.
3. The method of claim 1 , wherein the beginning of the channel occupancy is based on when a first LBT procedure indicates that the clear channel.
4. The method of claim 1 , further comprising adjusting a contention window based on the contention window value.
5. The method of claim 1 , wherein the reference duration comprises multiple contiguous slots from a beginning of a transmission burst or a channel occupancy time.
6. The method of claim 1 , further comprising receiving one or more messages comprising configuration parameters of a cell, wherein a length of the reference duration is based on a numerology of the cell.
7. The method of claim 1 , wherein the one or more NDIs indicate:
one or more positive acknowledgements (ACKs); or
one or more negative acknowledgements (NACKs).
8. A wireless device comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, cause the wireless device to:
determine a reference duration for contention window adjustment, wherein the reference duration is from a beginning of a channel occupancy and until an end of a first slot where at least one physical uplink shared channel (PUSCH) is transmitted;
determine a contention window value based on one or more new data indicators (NDIs) of one or more first transport blocks transmitted during the reference duration;
perform a listen before talk (LBT) procedure based on the contention window value; and
transmit one or more second transport blocks based on the LBT procedure indicating a clear channel.
9. The wireless device of claim 8 , wherein the beginning of the channel occupancy is a beginning of a channel occupancy of a first transmission burst.
10. The wireless device of claim 8 , wherein the beginning of the channel occupancy is based on when a first LBT procedure indicates the clear channel.
11. The wireless device of claim 8 , wherein the instructions further cause the wireless device to adjust a contention window based on the contention window value.
12. The wireless device of claim 8 , wherein the reference duration comprises multiple contiguous slots from a beginning of a transmission burst or a channel occupancy time.
13. The wireless device of claim 8 , wherein the instructions further cause the wireless device to receive one or more messages comprising configuration parameters of a cell, wherein a length of the reference duration is based on a numerology of the cell.
14. The wireless device of claim 8 , wherein the one or more NDIs indicate:
one or more positive acknowledgements (ACKs); or
one or more negative acknowledgements (NACKs).
15. A method comprising:
determining, by a base station, a reference duration for contention window adjustment, wherein the reference duration is from a beginning of a channel occupancy of and until an end of a first slot where at least one physical downlink shared channel (PDSCH) is transmitted;
determining a contention window value based on a first number of received negative acknowledgement feedbacks and a second number of received positive acknowledgement feedbacks corresponding to a plurality of first transport blocks transmitted during the reference duration;
performing a listen before talk (LBT) procedure based on the contention window value; and
transmitting one or more second transport blocks based on the LBT procedure indicating a clear channel.
16. The method of claim 15 , wherein the beginning of the channel occupancy is a beginning of a channel occupancy of a first transmission burst.
17. The method of claim 15 , wherein the beginning of the channel occupancy is based on when a first LBT procedure indicates the clear channel.
18. The method of claim 15 , further comprising adjusting a contention window based on the contention window value.
19. The method of claim 15 , wherein the reference duration comprises multiple contiguous slots from a beginning of a transmission burst or a channel occupancy time.
20. The method of claim 15 , further comprising transmitting one or more messages comprising configuration parameters of a cell, wherein a length of the reference duration is based on a numerology of the cell.