A wireless device receives parameters indicating: a hybrid automatic repeat request (HARQ) round trip time (RTT) timer of a multicast and broadcast service (MBS) session, and a HARQ feedback is enabled for the MBS session. Based on the HARQ feedback being enabled, the wireless device transmits a HARQ feedback corresponding to a transport block (TB) transmitted to wireless devices including the wireless device. In response to an expiry of the HARQ RTT timer started based on the transmitting, a physical downlink control channel (PDCCH) for a retransmission of the TB is monitored.