A method for downlink feedback information transmission in a shared spectrum, the method comprising: transmitting by a network node to a user equipment at least one downlink control information, said downlink control information carrying a downlink feedback information, wherein the downlink feedback information comprises a Hybrid Automatic Repeat Request Acknowledgement, HARQ-ACK, feedback information for a transmission from the user equipment to the network node; wherein the transmission comprises a PUSCH transmission and the PUSCH transmission comprises a configured UL grant PUSCH transmission; wherein when the configured uplink grant is configured uplink grant Type 1 in New Radio, NR, a maximum length of the downlink feedback information in the downlink control information is a first length, L1, and when the configured uplink grant is configured uplink grant Type 2 in NR, the maximum length of the downlink feedback information in the downlink control information is a second length, L2, wherein the first length, L1, is equal to the second length L2; wherein a format of the downlink control information for downlink feedback information transmission is the same as a format of the downlink control information for scheduling activation of the configured uplink grant, wherein the format includes the format 0_1 in NR; wherein the following fields in the format 0_1 of the downlink control information for scheduling activation of the configured uplink grant are not used for downlink feedback information transmission: HARQ process number and Redundancy version. transmitting by a network node to a user equipment at least one downlink control information, said downlink control information carrying a downlink feedback information, wherein the downlink feedback information comprises a Hybrid Automatic Repeat Request Acknowledgement, HARQ-ACK, feedback information for a transmission from the user equipment to the network node; wherein the transmission comprises a PUSCH transmission and the PUSCH transmission comprises a configured UL grant PUSCH transmission; wherein when the configured uplink grant is configured uplink grant Type 1 in New Radio, NR, a maximum length of the downlink feedback information in the downlink control information is a first length, L1, and when the configured uplink grant is configured uplink grant Type 2 in NR, the maximum length of the downlink feedback information in the downlink control information is a second length, L2, wherein the first length, L1, is equal to the second length L2; wherein when the configured uplink grant is configured uplink grant Type 1 in New Radio, NR, a maximum length of the downlink feedback information in the downlink control information is a first length, L1, and when the configured uplink grant is configured uplink grant Type 2 in NR, the maximum length of the downlink feedback information in the downlink control information is a second length, L2, wherein the first length, L1, is equal to the second length L2; wherein a format of the downlink control information for downlink feedback information transmission is the same as a format of the downlink control information for scheduling activation of the configured uplink grant, wherein the format includes the format 0_1 in NR; wherein the following fields in the format 0_1 of the downlink control information for scheduling activation of the configured uplink grant are not used for downlink feedback information transmission: HARQ process number and Redundancy version.