Methods and devices for configuring HARQ-ACK feedback
The present disclosure describes methods, system, and devices for configuring hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback for physical downlink shared channel (PDSCH) transmission. The method includes receiving, by a user equipment (UE), a radio resource control (RRC) parameter to configure an enhanced dynamic HARQ-ACK feedback mode; and receiving, by the UE, a first downlink control information (DCI) comprising a first K. The first DCI corresponds to a first PDSCH. The method also includes receiving, by the UE, a second DCI for a second PDSCH, the second DCI comprising a second K with an applicable value; and transmitting, by the UE, an enhanced dynamic HARQ-ACK feedback according to a preset rule.
1. A method for wireless communication, comprising:
configuring hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback for physical downlink shared channel (PDSCH) transmission by:
receiving, by a user equipment (UE), a radio resource control (RRC) parameter to configure an enhanced dynamic HARQ-ACK feedback mode;
receiving, by the UE, a first downlink control information (DCI) comprising a first K, the first DCI corresponding to a first PDSCH;
receiving, by the UE, a second DCI for a second PDSCH, the second DCI comprising a second K with an applicable value and a bit field for a uplink (UL) DAI, wherein in response to the second DCI not being configured with UL-TotalDAI-Included-r16 and two HARQ-ACK codebooks for different priority being necessary for HARQ-ACK transmission, the UL DAI in the second DCI corresponds to a HARQ-ACK codebook of higher priority; and
transmitting, by the UE, an enhanced dynamic HARQ-ACK feedback according to a preset rule.
2. The method according to claim 1 , wherein:
the first K comprises a non-applicable value of −1; and
the RRC parameter indicating the enhanced dynamic HARQ-ACK feedback mode comprises a pdsch-HARQ-ACK-Codebook with a positive value of enhancedDynamic-r16.
3. The method according to claim 1 , wherein:
in response to the first DCI and the second DCI indicating same priority and same group, the UE combines a first HARQ-ACK feedback for the first PDSCH in an enhanced dynamic HARQ-ACK codebook with a second HARQ-ACK feedback for the second PDSCH.
4. The method according to claim 3 , wherein:
the UE transmits the enhanced dynamic HARQ-ACK codebook in a slot at the second K after the second PDSCH.
5. The method according to claim 1 , wherein:
the second DCI comprises a new feedback indication (NFI) with a value not being toggled after the first DCI is received; and
in response to the first DCI and the second DCI indicating same priority and same group, the UE combines a first HARQ-ACK feedback for the first PDSCH in an enhanced dynamic HARQ-ACK codebook with a second HARQ-ACK feedback for the second PDSCH.
6. The method according to claim 5 , wherein:
the UE transmits the enhanced dynamic HARQ-ACK codebook in a sub-slot at the second K after the second PDSCH.
7. The method according to claim 5 , wherein:
the second DCI comprises a number of request PDSCH group with a positive value; and
in response to the first DCI and the second DCI indicating same priority, the UE combines a first HARQ-ACK feedback for the first PDSCH in an enhanced dynamic HARQ-ACK codebook with a second HARQ-ACK feedback for the second PDSCH.
8. The method according to claim 1 , wherein:
the UE transmits an enhanced dynamic HARQ-ACK codebook for a ultra-reliable low latency communication (URLLC) in a unlicensed band configured by a specific DCI format; and
a DCI with the specific DCI format indicates a PDSCH group index according to a predefined rule.
9. The method according to claim 8 , wherein:
the predefined rule comprises at least one of the following:
the DCI with the specific DCI format determines the PDSCH group index according to a priority indicator of the DCI;
the DCI with the specific DCI format determines the PDSCH group index as a default value; or
the DCI with the specific DCI format determines the PDSCH group index according to a predefined value configured by a RRC message.
10. The method according to claim 1 , wherein:
the UE transmits an enhanced dynamic HARQ-ACK codebook for a ultra-reliable low latency communication (URLLC) in a unlicensed band configured by a specific DCI format; and
a DCI with the specific DCI format comprises a bit field for a PDSCH group index according to a predefined rule.
11. The method according to claim 10 , wherein:
the predefined rule comprises that two DCIs with different priority indexes comprises different PDSCH group indexes.
12. The method according to claim 1 , wherein:
the second DCI being a specific format comprises a bit field for a NFI;
in response to the NFI of the second DCI being toggled:
a counter-downlink assignment index (C-DAI) and a total-downlink assignment index (T-DAI) are reset,
the UE discards a first HARQ-ACK feedback for the first PDSCH, and
the UE combines a second HARQ-ACK feedback for the second PDSCH in an enhanced dynamic HARQ-ACK codebook; and
in response to the NFI of the second DCI not being toggled:
the C-DAI and the T-DAI are accumulated, and
the UE combines a first HARQ-ACK feedback for the first PDSCH in the enhanced dynamic HARQ-ACK codebook with a second HARQ-ACK feedback for the second PDSCH.
13. The method according to claim 12 , wherein:
the UE transmits the enhanced dynamic HARQ-ACK codebook in a slot at the second K after the second PDSCH.
14. The method according to claim 1 , wherein:
in response to satisfying a predefined rule, the UE determines to combine a first HARQ-ACK feedback for the first PDSCH in an enhanced dynamic HARQ-ACK codebook with a second HARQ-ACK feedback for the second PDSCH.
15. The method according to claim 14 , wherein:
the predefined rule comprises at least one of the following:
the first PDSCH is in a predefined time window relative to the second PDSCH;
the UE determines whether a number of ACK/NACK bits in the enhanced dynamic HARQ-ACK codebook exceed a predefined threshold; or
the UE determines whether a NFI in a last DCI is toggled.
16. The method according to claim 15 , wherein:
the predefined time window comprises at least one sub-slot; and
in response to the first PDSCH is in the predefined time window relative to the second PDSCH, the UE combines a first HARQ-ACK feedback for the first PDSCH in the enhanced dynamic HARQ-ACK codebook with the second HARQ-ACK feedback for the second PDSCH.
17. A method for wireless communication, comprising:
configuring hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback for physical downlink shared channel (PDSCH) transmission by:
sending, by a radio access network (RAN) to a user equipment (UE), a radio resource control (RRC) parameter to configure an enhanced dynamic HARQ-ACK feedback mode;
sending, by the RAN to the UE, a first downlink control information (DCI) comprising a first K, the first DCI corresponding to a first PDSCH;
sending, by the RAN to the UE, a second DCI for a second PDSCH, the second DCI comprising a second K with an applicable value and a bit field for a uplink (UL) DAI, wherein in response to the second DCI not being configured with UL-TotalDAI-Included-r16 and two HARQ-ACK codebooks for different priority being necessary for HARQ-ACK transmission, the UL DAI in the second DCI corresponds to a HARQ-ACK codebook of higher priority; and
receiving, by the RAN from the UE, an enhanced dynamic HARQ-ACK feedback according to a preset rule.
18. A wireless communication device comprising:
a memory storing a plurality of instructions; and
a processor, in communication with the memory, configured to execute the plurality of instructions, and upon execution of the plurality of instructions, is configured to:
receive a radio resource control (RRC) parameter to configure an enhanced dynamic HARQ-ACK feedback mode;
receive a first downlink control information (DCI) comprising a first K, the first DCI corresponding to a first PDSCH;
receive a second DCI for a second PDSCH, the second DCI comprising a second K with an applicable value and a bit field for a uplink (UL) DAI, wherein in response to the second DCI not being configured with UL-TotalDAI-Included-r16 and two HARQ-ACK codebooks for different priority being necessary for HARQ-ACK transmission, the UL DAI in the second DCI corresponds to a HARQ-ACK codebook of higher priority; and
transmit an enhanced dynamic HARQ-ACK feedback according to a preset rule.
19. A wireless communication node comprising:
a memory storing a plurality of instructions; and
a processor, in communication with the memory, configured to execute the plurality of instructions, and upon execution of the plurality of instructions, is configured to:
sending a radio resource control (RRC) parameter to configure an enhanced dynamic HARQ-ACK feedback mode;
sending a first downlink control information (DCI) comprising a first K, the first DCI corresponding to a first PDSCH;
sending a second DCI for a second PDSCH, the second DCI comprising a second K with an applicable value and a bit field for a uplink (UL) DAI, wherein in response to the second DCI not being configured with UL-TotalDAI-Included-r16 and two HARQ-ACK codebooks for different priority being necessary for HARQ-ACK transmission, the UL DAI in the second DCI corresponds to a HARQ-ACK codebook of higher priority; and
receiving an enhanced dynamic HARQ-ACK feedback according to a preset rule.