Techniques for adjusting contention window in unlicensed new radio
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit an uplink communication, associated with a reference duration, in an uplink burst. The UE may receive hybrid automatic repeat request (HARQ) feedback after transmitting the uplink communication. The UE may adjust a size of a listen before talk (LBT) contention window based at least in part on whether the HARQ feedback is associated with the reference duration. Numerous other aspects are provided.
1 . A method of wireless communication performed by a user equipment (UE), comprising:
transmitting an uplink communication, associated with a reference duration and a channel access priority that satisfies a channel access priority threshold, in an uplink burst;
receiving hybrid automatic repeat request (HARQ) feedback after transmitting the uplink communication; and
adjusting a size of a listen before talk (LBT) contention window based at least in part on the channel access priority and on whether the HARQ feedback is associated with the reference duration.
2 . The method of claim 1 , further comprising:
determining that the HARQ feedback is associated with the uplink communication that is associated with the reference duration; and
determining that the HARQ feedback comprises an acknowledgement (ACK).
3 . The method of claim 2 , wherein adjusting the size of the LBT contention window comprises:
resetting the size of the LBT contention window based at least in part on determining that the HARQ feedback comprises the ACK and is associated with the uplink communication that is associated with the reference duration.
4 . The method of claim 1 , further comprising:
determining that the HARQ feedback is associated with the uplink communication that is associated with the reference duration; and
determining that the HARQ feedback comprises a negative acknowledgement (NACK).
5 . The method of claim 4 , wherein adjusting the size of the LBT contention window comprises:
increasing the size of the LBT contention window based at least in part on determining that the HARQ feedback comprises the NACK and is associated with the uplink communication that is associated with the reference duration.
6 . The method of claim 1 , further comprising:
determining that another HARQ feedback is not associated with the uplink communication that is associated with the reference duration; and
wherein adjusting the size of the LBT contention window comprises:
refraining from adjusting the size of the LBT contention window based at least in part on determining that other HARQ feedback is not associated with the uplink communication that is associated with the reference duration.
7 . The method of claim 1 , wherein the reference duration corresponds to duration of a reference subframe.
8 . The method of claim 1 , wherein the HARQ feedback is received in an uplink scheduling grant.
9 . A user equipment (UE) for wireless communication, comprising:
one or more memories; and
one or more processors, coupled to the one or more memories, configured to cause the UE to:
transmit an uplink communication, associated with a reference duration and a channel access priority that satisfies a channel access priority threshold, in an uplink burst;
receive hybrid automatic repeat request (HARQ) feedback after transmission of the uplink communication; and
adjust a size of a listen before talk (LBT) contention window based at least in part on the channel access priority and on whether the HARQ feedback is associated with the reference duration.
10 . The UE of claim 9 , wherein the one or more processors are further configured to cause the UE to:
determine that the HARQ feedback is associated with the uplink communication that is associated with the reference duration; and
determine that the HARQ feedback comprises an acknowledgement (ACK).
11 . The UE of claim 10 , wherein the one or more processors, to cause the UE to adjust the size of the LBT contention window, are configured to cause the UE to:
reset the size of the LBT contention window based at least in part on a determination that the HARQ feedback comprises the ACK and is associated with the uplink communication that is associated with the reference duration.
12 . The UE of claim 9 , wherein the one or more processors are further configured to cause the UE to:
determine that the HARQ feedback is associated with the uplink communication that is associated with the reference duration; and
determine that the HARQ feedback comprises a negative acknowledgement (NACK).
13 . The UE of claim 12 , wherein the one or more processors, to cause the UE to adjust the size of the LBT contention window, are configured to cause the UE to:
increase the size of the LBT contention window based at least in part on a determination that the HARQ feedback comprises the NACK and is associated with the uplink communication that is associated with the reference duration.
14 . The UE of claim 9 , wherein the one or more processors are further configured to cause the UE to:
determine that another HARQ feedback is not associated with the uplink communication that is associated with the reference duration; and
wherein the one or more processors, to cause the UE to adjust the size of the LBT contention window, are configured to cause the UE to:
refrain from adjusting the size of the LBT contention window based at least in part on determining that the other HARQ feedback is not associated with the uplink communication that is associated with the reference duration.
15 . The UE of claim 9 , wherein the reference duration corresponds to duration of a reference subframe.
16 . The UE of claim 9 , wherein the HARQ feedback is received in an uplink scheduling grant.
17 . A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising:
one or more instructions that, when executed by one or more processors of a user equipment (UE), cause the UE to:
transmit an uplink communication, associated with a reference duration and a channel access priority that satisfies a channel access priority threshold, in an uplink burst;
receive hybrid automatic repeat request (HARQ) feedback after transmission of the uplink communication; and
adjust a size of a listen before talk (LBT) contention window based at least in part on the channel access priority and on whether the HARQ feedback is associated with the reference duration.
18 . The non-transitory computer-readable medium of claim 17 , wherein the one or more instructions further cause the UE to:
determine that the HARQ feedback is associated with the uplink communication that is associated with the reference duration; and
determine that the HARQ feedback comprises an acknowledgement (ACK).
19 . The non-transitory computer-readable medium of claim 18 , wherein the one or more instructions, that cause the UE to adjust the size of the LBT contention window, cause the UE to:
reset the size of the LBT contention window based at least in part on a determination that the HARQ feedback comprises the ACK and is associated with the uplink communication that is associated with the reference duration.
20 . The non-transitory computer-readable medium of claim 17 , wherein the one or more instructions further cause the UE to:
determine that the HARQ feedback is associated with the uplink communication that is associated with the reference duration; and
determine that the HARQ feedback comprises a negative acknowledgement (NACK).
21 . The non-transitory computer-readable medium of claim 20 , wherein the one or more instructions, that cause the UE to adjust the size of the LBT contention window, cause the UE to:
increase the size of the LBT contention window based at least in part on a determination that the HARQ feedback comprises the NACK and is associated with the uplink communication that is associated with the reference duration.
22 . The non-transitory computer-readable medium of claim 17 , wherein the one or more instructions further cause the UE to:
determine that another HARQ feedback is not associated with the uplink communication that is associated with the reference duration; and
wherein the one or more instructions, that cause the UE to adjust the size of the LBT contention window, cause the UE to:
refrain from adjusting the size of the LBT contention window based at least in part on a determination that the other HARQ feedback is not associated with the uplink communication that is associated with the reference duration.
23 . The non-transitory computer-readable medium of claim 17 , wherein the reference duration corresponds to duration of a reference subframe.
24 . The non-transitory computer-readable medium of claim 17 , wherein the HARQ feedback is received in an uplink scheduling grant.
25 . An apparatus for wireless communication, comprising:
means for transmitting an uplink communication, associated with a reference duration and a channel access priority that satisfies a channel access priority threshold, in an uplink burst;
means for receiving hybrid automatic repeat request (HARQ) feedback after transmitting the uplink communication; and
means for adjusting a size of a listen before talk (LBT) contention window based at least in part on the channel access priority and on whether the HARQ feedback is associated with the reference duration.
26 . The apparatus of claim 25 , further comprising:
means for determining that the HARQ feedback is associated with the uplink communication that is associated with the reference duration; and
means for determining that the HARQ feedback comprises an acknowledgement (ACK).
27 . The apparatus of claim 26 , wherein the means for adjusting the size of the LBT contention window comprises:
means for resetting the size of the LBT contention window based at least in part on determining that the HARQ feedback comprises the ACK and is associated with the uplink communication that is associated with the reference duration.
28 . The apparatus of claim 25 , further comprising:
means for determining that the HARQ feedback is associated with the uplink communication that is associated with the reference duration; and
means for determining that the HARQ feedback comprises a negative acknowledgement (NACK).
29 . The apparatus of claim 28 , wherein the means for adjusting the size of the LBT contention window comprises:
means for increasing the size of the LBT contention window based at least in part on determining that the HARQ feedback comprises the NACK and is associated with the uplink communication that is associated with the reference duration.
30 . The apparatus of claim 25 , further comprising:
means for determining that another HARQ feedback is not associated with the uplink communication that is associated with the reference duration; and
wherein the means for adjusting the size of the LBT contention window comprises:
means for refraining from adjusting the size of the LBT contention window based at least in part on determining that the other HARQ feedback is not associated with the uplink communication that is associated with the reference duration.