Method and device in wireless transmission

A method in a base station supporting HARQ, comprising:

• transmitting a first radio signal;
• transmitting a low-latency signaling in L1 time intervals;
• and
• receiving first HARQ-ACK information;
• wherein the low-latency signaling is a physical layer signaling, the low-latency signaling comprises a first field, the first field in the low-latency signaling is used for determining at least the former one of whether a corresponding low-latency HARQ-ACK bit group comprises a HARQ-ACK bit in a first HARQ-ACK bit group and the number of HARQ-ACK bits in the corresponding low-latency HARQ-ACK bit group;
• the first HARQ-ACK bit group comprises a HARQ-ACK bit related to the first radio signal, the low-latency signaling is used for determining time-domain resources occupied by the corresponding low-latency HARQ-ACK bit group;
• the first HARQ-ACK information comprises part or all of HARQ-ACK bits in the first HARQ-ACK bit group;
• the first HARQ-ACK information and the low-latency HARQ-ACK bit group each comprise a positive integer number of HARQ-ACK bits, and one HARQ-ACK bit indicates whether one downlink bit block is correctly decoded;
• the L1 is a positive integer;
• time-domain resources occupied by the first radio signal are not later than any one of the L time intervals;
• and the first HARQ-ACK information is used for conveying the corresponding low-latency HARQ-ACK bit group.

A UE supporting HARQ, comprising:

• a first receiver, to receive a first radio signal;
• a second receiver, to detect a low-latency signaling in L1 time intervals respectively;
• and
• a first transceiver, to transmit first HARQ-ACK information;
• wherein the low-latency signaling is a physical layer signaling, the low-latency signaling comprises a first field, the first field in the low-latency signaling is used for determining at least the former one of whether a corresponding low-latency HARQ-ACK bit group comprises a HARQ-ACK bit in a first HARQ-ACK bit group and the number of HARQ-ACK bits in the corresponding low-latency HARQ-ACK bit group;
• the first HARQ-ACK bit group comprises a HARQ-ACK bit related to the first radio signal, the low-latency signaling is used for determining time-domain resources occupied by the corresponding low-latency HARQ-ACK bit group;
• the first HARQ-ACK information comprises part or all of HARQ-ACK bits in the first HARQ-ACK bit group;
• the first HARQ-ACK information and the low-latency HARQ-ACK bit group each comprise a positive integer number of HARQ-ACK bits, and one HARQ-ACK bit indicates whether one downlink bit block is correctly decoded;
• the L1 is a positive integer;
• time-domain resources occupied by the first radio signal are not later than any one of the L time intervals;
• and the first HARQ-ACK information is used for conveying the corresponding low-latency HARQ-ACK bit group.

A base station supporting HARQ, comprising:

• a first transmitter, to transmit a first radio signal;
• a second transmitter, to transmit a low-latency signaling in L1 time intervals;
• and
• a second transceiver, to receive first HARQ-ACK information;
• wherein the low-latency signaling is a physical layer signaling, the low-latency signaling comprises a first field, the first field in the low-latency signaling is used for determining at least the former one of whether a corresponding low-latency HARQ-ACK bit group comprises a HARQ-ACK bit in a first HARQ-ACK bit group and the number of HARQ-ACK bits in the corresponding low-latency HARQ-ACK bit group;
• the first HARQ-ACK bit group comprises a HARQ-ACK bit related to the first radio signal, the low-latency signaling is used for determining time-domain resources occupied by the corresponding low-latency HARQ-ACK bit group;
• the first HARQ-ACK information comprises part or all of HARQ-ACK bits in the first HARQ-ACK bit group;
• the first HARQ-ACK information and the low-latency HARQ-ACK bit group each comprise a positive integer number of HARQ-ACK bits, and one HARQ-ACK bit indicates whether one downlink bit block is correctly decoded;
• the L1 is a positive integer;
• time-domain resources occupied by the first radio signal are not later than any one of the L time intervals;
• and the first HARQ-ACK information is used for conveying the corresponding low-latency HARQ-ACK bit group.