Apparatuses, methods, and systems are disclosed for device-to-device transmission. One apparatus includes a processor that generates a first signal indicating a first sequence and a first resource pool. Transmission of the first sequence within the first resource pool indicates a behavior of a first device that transmits the transmission of the first sequence. Moreover, the first resource pool is configured for use by multiple devices. The apparatus also includes a transmitter that transmits the first signal to the first device.