METHODS FOR WIRELESS COMMUNICATION, UE, AND BASE STATION
An apparatus and a method of wireless communication are provided. The method by a user equipment (UE) includes being configured, by a base station, to receive a downlink channel in a set of symbols for a serving cell and reporting, to the base station, an acknowledgement of the downlink channel in an uplink transmission. This can solve issues in the prior art, provide a method to determine an acknowledgement of a downlink channel in an uplink transmission, reduce signaling overhead, provide a good communication performance, and/or provide high reliability.
1 . A method for wireless communication, performed by a user equipment (UE), the method comprising:
being configured, by a base station, to receive a downlink channel in a set of symbols for a serving cell; and
reporting, to the base station, an acknowledgement of the downlink channel in an uplink transmission.
2 . The method of claim 1 , wherein at least one of the following applies:
the downlink channel comprises a physical downlink shared channel (PDSCH);
the uplink transmission comprises a physical uplink control channel (PUCCH) transmission;
the downlink channel is configured in a new radio-based access to a unlicensed spectrum or shared spectrum; or
the uplink transmission is reported in the new radio-based access to the unlicensed spectrum or shared spectrum.
3 . The method of claim 2 , wherein at least one of the following applies:
the PDSCH comprises a semi-persistent scheduled (SPS) PDSCH;
the acknowledgement of the downlink channel comprises a hybrid automatic repeat request-acknowledgement (HARQ-ACK) information corresponding to the PDSCH, the HARQ-ACK information comprising an ACK or a negative-acknowledgement (NACK); or
the PDSCH corresponds to a HARQ process number and a transport block.
4 . The method of claim 1 , wherein the set of symbols are within a channel occupancy of the serving cell,
wherein the channel occupancy of the serving cell is indicated by at least one of the following: a downlink control information (DCI) format 2_0 or a semi-static channel occupancy.
5 . The method of claim 4 , wherein at least one of the following applies:
an indication field in the DCI format 2_0 comprises at least one of the following: a resource block (RB) set indicator, a slot format indicator (SFI) index, a channel occupancy duration, or a search space set group switching field, and the indication field in the DCI format 2_0 indicates the channel occupancy of the serving cell; or
the semi-static channel occupancy indicates the channel occupancy of the serving cell, and is configured by a first radio resource control (RRC) parameter.
6 . The method of claim 3 , wherein the acknowledgement of the downlink channel comprises the HARQ-ACK information corresponding to the PDSCH when a first condition is met,
wherein the first condition comprises at least of the following;
the set of symbols are within the channel occupancy of the serving cell;
the set of symbols are indicated as downlink;
the UE is not configured to monitor the DCI format 2_0;
the DCI format 2_0 excludes a first indication field, the first indication field comprising at least one of the following: the RB set indicator, the SFI index, the channel occupancy duration, or the search space set group switching field, and the SFI index indicating that the set of symbols are downlink, uplink, or flexible; or
the UE is configured with a second RRC parameter, the second RRC parameter indicating that the first condition is met.
7 . The method of claim 3 , wherein the acknowledgement of the downlink channel comprises the NACK corresponding to the PDSCH when a second condition is met,
wherein the second condition comprises at least one of the following:
at least one symbol of the set of symbols is outside the channel occupancy of the serving cell;
at least one symbol of the set of symbols is indicated as uplink or flexible;
the UE is not configured to monitor the DCI format 2_0;
the DCI format 2_0 excludes a first indication field; or
the UE is configured by a third RRC parameter, the third RRC parameter indicating that the second condition is met.
8 . The method of claim 2 , wherein at least one of the following applies:
the PUCCH carriers the acknowledgement of the downlink channel; or
the PUCCH carriers a HARQ-ACK codebook, wherein the HARQ-ACK codebook comprises the acknowledgement of the downlink channel, and the HARQ-ACK codebook comprises at least one of the following: a type 1 HARQ-ACK codebook, a type 2 HARQ-ACK codebook, a type 2 HARQ-ACK codebook with grouping, or a type 3 HARQ-ACK codebook.
9 . A method for wireless communication, performed by a base station, the method comprising:
configuring, to a user equipment (UE), to transmit a downlink channel in a set of symbols for a serving cell; and
receiving, from the UE, an acknowledgement of the downlink channel in an uplink transmission.
10 . The method of claim 9 , wherein at least one of the following applies:
the downlink channel comprises a physical downlink shared channel (PDSCH);
the uplink transmission comprises a physical uplink control channel (PUCCH) transmission;
the downlink channel is configured in a new radio-based access to a unlicensed spectrum or shared spectrum; or
the uplink transmission is received in the new radio-based access to the unlicensed spectrum or shared spectrum.
11 . The method of claim 10 , wherein at least one of the following applies:
the PDSCH comprises a semi-persistent scheduled (SPS) PDSCH;
the acknowledgement of the downlink channel comprises a hybrid automatic repeat request-acknowledgement (HARQ-ACK) information corresponding to the PDSCH, the HARQ-ACK information comprising an ACK or a negative-acknowledgement (NACK); or
the PDSCH corresponds to a HARQ process number and a transport block.
12 . The method of claim 9 , wherein the set of symbols are within a channel occupancy of the serving cell,
wherein the channel occupancy of the serving cell is indicated by at least one of the following: a downlink control information (DCI) format 2_0 or a semi-static channel occupancy.
13 . The method of claim 11 , wherein the acknowledgement of the downlink channel comprises the HARQ-ACK information corresponding to the PDSCH when a first condition is met,
wherein the first condition comprises at least of the following:
the set of symbols are within the channel occupancy of the serving cell;
the set of symbols are indicated as downlink;
the UE is not configured to monitor the DCI format 2_0;
the DCI format 2_0 excludes a first indication field, the first indication field comprising at least one of the following: the RB set indicator, the SFI index, the channel occupancy duration, or the search space set group switching field, and the SFI index indicating that the set of symbols are downlink, uplink, or flexible; or
the UE is configured with a second RRC parameter, the second RRC parameter indicating that the first condition is met.
14 . The method of claim 11 , wherein the acknowledgement of the downlink channel comprises the NACK corresponding to the PDSCH when a second condition is met,
wherein the second condition comprises at least one of the following:
at least one symbol of the set of symbols is outside the channel occupancy of the serving cell;
at least one symbol of the set of symbols is indicated as uplink or flexible;
the UE is not configured to monitor the DCI format 2_0;
the DCI format 2_0 excludes a first indication field; or
the UE is configured by a third RRC parameter, the third RRC parameter indicating that the second condition is met.
15 . A user equipment (UE), comprising:
a memory;
a transceiver; and
a processor coupled to the memory and the transceiver;
wherein the processor is configured, by a base station, to receive a downlink channel in a set of symbols for a serving cell; and
the processor is configured to report, to the base station, an acknowledgement of the downlink channel in an uplink transmission.
16 . The UE of claim 15 , wherein at least one of the following applies:
the downlink channel comprises a physical downlink shared channel (PDSCH);
the uplink transmission comprises a physical uplink control channel (PUCCH) transmission;
the downlink channel is configured in a new radio-based access to a unlicensed spectrum or shared spectrum; or
the uplink transmission is reported in the new radio-based access to the unlicensed spectrum or shared spectrum.
17 . The UE of claim 16 , wherein at least one of the following applies:
the PDSCH comprises a semi-persistent scheduled (SPS) PDSCH;
the acknowledgement of the downlink channel comprises a hybrid automatic repeat request-acknowledgement (HARQ-ACK) information corresponding to the PDSCH, the HARQ-ACK information comprising an ACK or a negative-acknowledgement (NACK); or
the PDSCH corresponds to a HARQ process number and a transport block.
18 . The UE of claim 17 , wherein the acknowledgement of the downlink channel comprises the HARQ-ACK information corresponding to the PDSCH when a first condition is met,
wherein the first condition comprises at least of the following;
the set of symbols are within the channel occupancy of the serving cell;
the set of symbols are indicated as downlink;
the processor is not configured to monitor the DCI format 2_0;
the DCI format 2_0 excludes a first indication field, the first indication field comprising at least one of the following: the RB set indicator, the SFI index, the channel occupancy duration, or the search space set group switching field, and the SFI index indicating that the set of symbols are downlink, uplink, or flexible; or
the processor is configured with a second RRC parameter, the second RRC parameter indicating that the first condition is met.
19 . The UE of claim 17 , wherein the acknowledgement of the downlink channel comprises the NACK corresponding to the PDSCH when a second condition is met,
wherein the second condition comprises at least one of the following:
at least one symbol of the set of symbols is outside the channel occupancy of the serving cell;
at least one symbol of the set of symbols is indicated as uplink or flexible;
the processor is not configured to monitor the DCI format 2_0;
the DCI format 2_0 excludes a first indication field; or
the processor is configured by a third RRC parameter, the third RRC parameter indicating that the second condition is met.
20 . Abase station, comprising:
a memory;
a transceiver; and
a processor coupled to the memory and the transceiver;
wherein the processor is configured to configure, to a user equipment (UE), to transmit a downlink channel in a set of symbols for a serving cell; and
wherein the transceiver is configured to receive, from the UE, an acknowledgement of the downlink channel in an uplink transmission.