A method for wireless communication in a 3 rd generation partnership project, 3GPP, communication system, performed by a base station and comprising: identifying a downlink transmission time interval, TTI, structure and a feedback configuration, wherein the feedback configuration comprises a feedback timing spanning a first set of orthogonal frequency division multiplexing, OFDM, symbols and a rescheduling timing spanning a second set of OFDM symbols, wherein the downlink TTI structure comprises a plurality of shortTTIs, sTTIs, that are TTIs spanning each two or three OFDM symbols; receiving , unsuccessfully, a first downlink transmission from a first user equipment, UE, and a second downlink transmission from a second user equipment, UE in a first downlink sTTI, wherein the two downlink transmissions are transmitted in two separate partial sTTIs in the same sTTI, where a partial sTTI spans fewer than all the resources of the sTTI; generating , following the feedback timing, a first NACK transmission for the first downlink transmission of the first UE and a second NACK transmission for the second downlink transmission of the second UE; transmitting the first NACK transmission and the second NACK transmission in a partial uplink sTTI that is shared by both the first UE and the second UE; and receiving , based at least in part on the received feedback and following the rescheduling timing, a retransmission of the first downlink transmission from the first UE and the second downlink transmission from the second UE that are transmitted in separate partial sTTIs in a second downlink sTTI, wherein the first downlink sTTI and the second downlink sTTI are located within a same subframe or within one millisecond. identifying a downlink transmission time interval, TTI, structure and a feedback configuration, wherein the feedback configuration comprises a feedback timing spanning a first set of orthogonal frequency division multiplexing, OFDM, symbols and a rescheduling timing spanning a second set of OFDM symbols, wherein the downlink TTI structure comprises a plurality of shortTTIs, sTTIs, that are TTIs spanning each two or three OFDM symbols; receiving , unsuccessfully, a first downlink transmission from a first user equipment, UE, and a second downlink transmission from a second user equipment, UE in a first downlink sTTI, wherein the two downlink transmissions are transmitted in two separate partial sTTIs in the same sTTI, where a partial sTTI spans fewer than all the resources of the sTTI; generating , following the feedback timing, a first NACK transmission for the first downlink transmission of the first UE and a second NACK transmission for the second downlink transmission of the second UE; transmitting the first NACK transmission and the second NACK transmission in a partial uplink sTTI that is shared by both the first UE and the second UE; and receiving , based at least in part on the received feedback and following the rescheduling timing, a retransmission of the first downlink transmission from the first UE and the second downlink transmission from the second UE that are transmitted in separate partial sTTIs in a second downlink sTTI, wherein the first downlink sTTI and the second downlink sTTI are located within a same subframe or within one millisecond. <EOS>