Triggering HARQ-ACK reporting on unlicensed spectrum
Methods and apparatuses for triggering HARQ-ACK feedback. A method comprising: receiving a first Downlink Control Information (DCI) from a base unit for scheduling a Downlink (DL) transmission, wherein the first DCI includes a first indicator indicating to suspend transmission of a Hybrid Automatic Repeat Request Acknowledgement (HARQ-ACK) feedback corresponding to the DL transmission; receiving a second DCI from the base unit for scheduling the transmission of the HARQ-ACK feedback, wherein the second DCI indicates a resource for the transmission of the HARQ-ACK feedback; and transmitting the HARQ-ACK feedback to the base unit on the resource indicated by the second DCI.
1 . A method performed by a user equipment (UE) the method comprising:
receiving a first downlink control information from a base station for scheduling a downlink transmission, wherein the first downlink control information includes a feedback timing indicator field having a first value, the first value indicating to temporarily suspend transmission of a hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback corresponding to the downlink transmission;
determining, based at least in part on the first value, to suspend HARQ-ACK feedback and wait for a second downlink control information;
refraining, in response to determining to suspend HARQ-ACK feedback, from transmitting any HARQ-ACK feedback;
receiving, subsequent to receiving the first downlink control information and determining to suspend HARQ-ACK feedback, the second downlink control information from the base station for scheduling the transmission of the suspended HARQ-ACK feedback corresponding to the downlink transmission, wherein:
the second downlink control information includes a feedback timing indicator field having a second value different from the first value;
the second value indicates a slot for the transmission of the suspended HARQ-ACK feedback corresponding to the downlink transmission; and
the second value comprises a positive numerical value; and
transmitting, in response to receiving the second downlink control information, the suspended HARQ-ACK feedback corresponding to the downlink transmission to the base station on the slot indicated by the second downlink control information.
2 . The method of claim 1 , wherein the feedback timing indicator indicates a predefined hybrid automatic repeat request timing value for suspending the transmission of the HARQ-ACK feedback.
3 . The method of claim 1 , wherein the feedback timing indicator indicates a predefined physical uplink control channel resource for suspending the transmission of the HARQ-ACK feedback.
4 . The method of claim 1 , wherein the first value comprises one bit for indicating suspension of the transmission of the HARQ-ACK feedback.
5 . The method of claim 1 , wherein the feedback timing indicator comprises a counter downlink assignment index and a total downlink assignment index and the determining to suspend the transmission of the HARQ-ACK feedback is in response to a value of counter downlink assignment index being smaller than a value of total downlink assignment index.
6 . The method of claim 1 , wherein the first downlink control information includes a HARQ-ACK codebook index.
7 . The method of claim 6 , wherein a bit length of the HARQ-ACK codebook index is determined based on radio resource control signaling.
8 . The method of claim 6 , wherein the second downlink control information includes the HARQ-ACK codebook index for scheduling transmission of the corresponding HARQ-ACK codebook.
9 . The method of claim 1 , wherein the second downlink control information schedules transmission of a HARQ-ACK feedback for a hybrid automatic repeat request process by indicating the corresponding hybrid automatic repeat request process identifier of the hybrid automatic repeat request process in the second downlink control information.
10 . The method of claim 9 , wherein the second downlink control information includes one field for indicating a starting hybrid automatic repeat request process identifier and another field for indicating a number of contiguous hybrid automatic repeat request processes.
11 . The method of claim 9 , wherein the second downlink control information includes one field for indicating a starting hybrid automatic repeat request process identifier and a number of contiguous hybrid automatic repeat request processes.
12 . The method of claim 1 ,
wherein the HARQ-ACK feedback is included in a first HARQ-ACK codebook and the transmission of the first HARQ codebook is suspended in response to the first value indicating to suspend the first HARQ-ACK codebook; and
wherein the second downlink control information schedules the transmission of the first HARQ-ACK codebook and retransmission of a second HARQ-ACK codebook,
wherein the transmission of the second HARQ-ACK codebook was not correctly received by the base station.
13 . The method of claim 12 , wherein the first and second HARQ-ACK codebooks are transmitted in one uplink control information.
14 . The method of claim 12 , wherein the first and second HARQ-ACK codebooks are transmitted in two separate uplink control informations.
15 . The method of claim 1 , wherein the first downlink control information includes a field for indicating listen-before-talk type for the transmission of the HARQ-ACK feedback.
16 . The method of claim 1 , wherein the first downlink control information includes a field for indicating listen-before-talk priority class for the transmission of the HARQ-ACK feedback.
17 . The method of claim 1 , wherein the second downlink control information includes a field for indicating listen-before-talk type for the transmission of the HARQ-ACK feedback.
18 . A method performed by a base station, the method comprising:
transmitting a first downlink control information from a base station for scheduling a downlink transmission, wherein the first downlink control information includes a feedback timing indicator field having a first value, the first value indicating to temporarily suspend transmission of a hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback corresponding to the downlink transmission;
transmitting, subsequent to transmitting the first downlink control information, a second downlink control information for scheduling the transmission of the HARQ-ACK feedback, wherein the second downlink control information includes a feedback timing indicator field having a second value different from the first value;
the second value indicates a slot for the transmission of a suspended HARQ-ACK feedback corresponding to the downlink transmission; and
the second value comprises a positive numerical value; and
receiving, in response to transmitting the second downlink control information, the suspended HARQ-ACK feedback corresponding to the downlink transmission
transmitted on the slot indicated by the second downlink control information.
19 . A user equipment (UE) comprising:
At least one memory; and
At least one processor coupled with at least one memory and configured to cause the UE to:
receive a first downlink control information from a base station for scheduling a downlink transmission, wherein the first downlink control information includes a feedback timing indicator field having a first value, the first value indicating to temporarily suspend transmission of a hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback corresponding to the downlink transmission;
determine, based at least in part on the first value, to suspend HARQ-ACK feedback and wait for a second downlink control information;
refrain, in response to determining to suspend HARQ-ACK feedback, from transmitting any HARQ-ACK feedback;
receive, subsequent to receiving the first downlink control information and determining to suspend HARQ-ACK feedback, the second downlink control information from the base station for scheduling the transmission of the suspended HARQ-ACK feedback corresponding to the downlink transmission, wherein:
the second downlink control information includes a feedback timing indicator field having a second value different from the first value;
the second value indicates a slot for the transmission of the suspended HARQ-ACK feedback corresponding to the downlink transmission; and
the second value comprises a positive numerical value; and
transmit, in response to receiving the second downlink control information, the suspended HARQ-ACK feedback corresponding to the downlink transmission to the base station on the slot indicated by the second downlink control information.
20 . A base station, comprising:
At least one memory; and
At least one processor coupled with at least one memory and configured to cause the base station to:
transmit a first downlink control information from a base station for scheduling a downlink transmission, wherein the first downlink control information includes a feedback timing indicator field having a first value, the first value indicating to temporarily suspend transmission of a hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback corresponding to the downlink transmission;
transmit, subsequent to transmitting the first downlink control information, a second downlink control information for scheduling the transmission of the HARQ-ACK feedback, wherein the second downlink control information includes a feedback timing indicator field having a second value different from the first value;
the second value indicates a slot for the transmission of a suspended HARQ-ACK feedback corresponding to the downlink transmission; and
the second value comprises a positive numerical value; and
receive, in response to transmitting the second downlink control information, the suspended HARQ-ACK feedback corresponding to the downlink transmission transmitted on the slot indicated by the second downlink control information.