A user equipment, UE, comprising: device to device, D2D, circuitry to: identify that a first sidelink transmission by the UE is to be transmitted in a same subframe as a second sidelink transmission by the UE; and identify, based on a type of the first sidelink transmission and a type of the second sidelink transmission, that the UE is to continue to transmit the first sidelink transmission and that the UE is to drop the second sidelink transmission; and interface control circuitry coupled with the D2D circuitry, the interface control circuitry to transmit, based on the identification that the UE is to drop the second sidelink transmission, the first sidelink transmission on the subframe; wherein the D2D circuitry is to identify that the first sidelink transmission by the UE is to be transmitted in the same subframe as the second sidelink transmission based on an identification that the first sidelink transmission is to collide in the time domain with the second sidelink transmission; wherein the first sidelink transmission is a Type 2B D2D discovery transmission, and the second sidelink transmission is a Type 1 D2D discovery transmission; and wherein the UE is configured, for Type 2B discovery, to continue D2D transmission of discovery media access control, MAC, protocol data units, PDUs, on other transmission time intervals, TTIs, of a transmission opportunity bundle, TOB, in which the collision occurred, and, for Type 1 discovery, to continue transmission of a discovery MAC PDU on other TTIs or subframes of a discovery resources period irrespective of whether one or more of the transmissions of the MAC PDU are dropped. identify that a first sidelink transmission by the UE is to be transmitted in a same subframe as a second sidelink transmission by the UE; and identify, based on a type of the first sidelink transmission and a type of the second sidelink transmission, that the UE is to continue to transmit the first sidelink transmission and that the UE is to drop the second sidelink transmission; and interface control circuitry coupled with the D2D circuitry, the interface control circuitry to transmit, based on the identification that the UE is to drop the second sidelink transmission, the first sidelink transmission on the subframe; wherein the D2D circuitry is to identify that the first sidelink transmission by the UE is to be transmitted in the same subframe as the second sidelink transmission based on an identification that the first sidelink transmission is to collide in the time domain with the second sidelink transmission; wherein the first sidelink transmission is a Type 2B D2D discovery transmission, and the second sidelink transmission is a Type 1 D2D discovery transmission; and wherein the UE is configured, for Type 2B discovery, to continue D2D transmission of discovery media access control, MAC, protocol data units, PDUs, on other transmission time intervals, TTIs, of a transmission opportunity bundle, TOB, in which the collision occurred, and, for Type 1 discovery, to continue transmission of a discovery MAC PDU on other TTIs or subframes of a discovery resources period irrespective of whether one or more of the transmissions of the MAC PDU are dropped.