HARQ feedback transmission for sidelink communications in unlicensed spectrum

In one aspect, a method of wireless communication includes receiving, by a user equipment (UE), a sidelink transmission in a first slot of an unlicensed channel. The method further includes performing, by the UE, a channel access (CA) operation for hybrid automatic repeat request (HARQ) feedback transmission in a second slot for sidelink transmission, wherein the second slot is one of the plurality of slots configured for HARQ feedback for sidelink transmission. The method further includes transmitting, by the UE, a HARQ feedback transmission in a second time slot based on successfully performing the CA operation. Other aspects and features are also claimed and described. 在一个方面中，一种无线通信的方法包括：由用户设备(UE)在未授权信道的第一时隙中接收侧链路发送。该方法还包括：由UE在用于侧链路发送的第二时隙中执行用于混合自动重传请求(HARQ)反馈发送的信道接入(CA)操作，其中第二时隙是被配置用于针对侧链路发送的HARQ反馈的多个时隙中的一个时隙。所述方法还包括：由UE基于成功地执行CA操作来在第二时隙中发送HARQ反馈发送。还要求保护和描述了其他方面和特征。