A base station distributed unit may receive packet data convergence protocol (PDCP) packets of a radio bearer. The base station distributed unit may transmit, to a wireless device, the PDCP packets via the radio bearer. The base station distributed unit may initiate a bearer release procedure comprising transmitting, to a base station central unit, a first message comprising a first data radio bearer identifier of the radio bearer to be released. The base station distributed unit may receive, from the base station central unit, a second message confirming release of the radio bearer by the base station central unit. The base station distributed unit may receive, from the base station central unit, a radio resource control message for the wireless device. The radio resource control message may comprise the first data radio bearer identifier. The base station distributed unit may transmit, to the wireless device, the radio resource control message.