transmitting, to a wireless device, an indication of a physical downlink channel configuration for receiving a physical downlink channel transmission, the physical downlink channel transmission including a demodulation reference signal (DMRS);

receiving, from the wireless device, an indication that the wireless device supports bundling DMRS signals across multiple slots and an indication that the wireless device supports dynamic DMRS reconfiguration;

transmitting, to the wireless device, a DMRS configuration, wherein the DMRS configuration includes a channel estimation bundle window indicating that channel estimation may be performed across multiple slots, and wherein the DMRS configuration further indicates a number of DMRS signals to transmit in at least one of the multiple slots of the channel estimation bundle window;

transmitting, by a wireless node and based on the DMRS configuration, a set of DMRS signals in the channel estimation bundle window, wherein a first DMRS signal of the set of DMRS signals is transmitted in a first slot, and wherein a second DMRS signal of the set of DMRS signals is transmitted in a second slot, and wherein the first DMRS signal and the second DMRS signal are configured for use by the wireless device to estimate a radio channel based on the first DMRS signal and the second DMRS signal, and

transmit a DMRS reconfiguration indication, the DMRS reconfiguration indication changing the number of DMRS signals to transmit in at least one of the multiple slots of the channel estimation bundle window.