Uplink control information retransmission
Methods and apparatuses for retransmitting uplink control information. An apparatus comprising: a receiver that receives uplink control information (UCI) from a remote unit, wherein the UCI includes hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback corresponding to a plurality of downlink transmissions; a processor that decodes the UCI; and a transmitter that, in response to the UCI not being correctly decoded, transmits downlink control information (DCI) including a first signaling to the remote unit, wherein the first signaling includes an indicator indicating that the UCI is not correctly decoded and an identification corresponding to the UCI.
1 . A base station, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the base station to:
transmit, to a user equipment (UE), a set of downlink transmissions;
receive, from the UE, hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback corresponding to the set of downlink transmissions;
decode the HARQ-ACK feedback;
in response to the HARQ-ACK feedback not being correctly decoded, transmit, to the UE, first downlink control information (DCI) including a first indicator for requesting the UE to retransmit the HARQ-ACK feedback; and
in response to the HARQ-ACK feedback being correctly decoded, transmit a second DCI to the UE including a third indicator indicating that the HARQ-ACK feedback is correctly decoded.
2 . The base station of claim 1 , wherein the set of downlink transmissions is associated with a set identifier (ID).
3 . The base station of claim 2 , wherein the first DCI includes a second indicator indicating the set ID.
4 . The base station of claim 3 , wherein a maximum number of sets of downlink transmissions is configured by radio resource control (RRC) signaling and determines a number of bits for indicating the set ID in the first DCI.
5 . The base station of claim 2 , wherein the set ID is used to differentiate different sets of downlink transmissions.
6 . The base station of claim 1 , wherein the at least one processor is configured to cause the base station to transmit a radio resource control (RRC) signaling to the UE, and the RRC signaling configures the UE in a mode of supporting retransmission of the HARQ-ACK feedback.
7 . The base station of claim 1 , wherein the at least one processor is configured to cause the base station to transmit a radio resource control (RRC) signaling to the UE, and the RRC signaling configures a timer starting in a slot where the HARQ-ACK feedback is firstly received.
8 . The base station of claim 7 , wherein the first DCI is transmitted before the time expires.
9 . A user equipment (UE), comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the UE to:
receive a set of downlink transmissions;
transmit hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback corresponding to the set of downlink transmissions;
receive first downlink control information (DCI);
retransmit the HARQ-ACK feedback in response to the first DCI including a first indicator for requesting a user equipment (UE) to retransmit the HARQ-ACK feedback; and
receive a second DCI including a third indicator indicating the HARQ-ACK feedback is correctly decoded.
10 . The UE of claim 9 , wherein the set of downlink transmissions is associated with a set identifier (ID).
11 . The UE of claim 10 , wherein the first DCI includes a second indicator indicating the set ID.
12 . The UE of claim 11 , wherein a maximum number of sets of downlink transmissions is configured by radio resource control (RRC) signaling and determines a number of bits for indicating the set ID in the first DCI.
13 . The UE of claim 10 , wherein the set ID is used to differentiate different sets of downlink transmissions.
14 . The UE of claim 9 , wherein the at least one processor is configured to cause the UE to receive a radio resource control (RRC) signaling configuring the UE in a mode of supporting retransmission of the HARQ-ACK feedback.
15 . The UE of claim 9 , wherein the at least one processor is configured to cause the UE to receive a radio resource control (RRC) signaling configuring a timer starting in a slot where the HARQ-ACK feedback is firstly transmitted.
16 . The UE of claim 15 , wherein the first DCI is received before the time expires.
17 . The UE of claim 9 , wherein the at least one processor is configured to cause the UE to store the HARQ-ACK feedback in the memory until the third indicator is received.
18 . The UE of claim 17 , wherein the at least one processor is configured to cause the UE to store the HARQ-ACK feedback in the memory until the timer expires.
19 . A method performed by a base station, the method comprising:
transmitting, to a user equipment (UE), a set of downlink transmissions;
receiving, from the UE, hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback corresponding to the set of downlink transmissions;
decoding the HARQ-ACK feedback;
in response to the HARQ-ACK feedback not being correctly decoded, transmitting, to the UE, first downlink control information (DCI) including a first indicator for requesting the UE to retransmit the HARQ-ACK feedback; and
in response to the HARQ-ACK feedback being correctly decoded, transmitting a second DCI to the UE including a third indicator indicating that the HARQ-ACK feedback is correctly decoded.
20 . A method performed by a user equipment (UE), the method comprising:
receiving a set of downlink transmissions;
transmitting hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback corresponding to the set of downlink transmissions; receive first downlink control information (DCI);
retransmitting the HARQ-ACK feedback in response to the first DCI including a first indicator for requesting a user equipment (UE) to retransmit the HARQ-ACK feedback; and
receiving a second DCI including a third indicator indicating the HARQ-ACK feedback is correctly decoded.