Methods, systems, and devices for wireless communications are described. Generally, the described techniques provide for signaling a semi-static configuration for demodulation reference signal (DMRS) bundling across non-uniform bundles of transmission time intervals (TTIs). A base station may transmit control signaling to a user equipment (UE) that schedules resources for DMRSs and associated data channels across the TTIs. For example, the base station may transmit a bundling configuration to the UE that may configure a bundling sequence defining an order for the bundles and a number of TTIs for each bundle. Based on the control signaling, the UE may determine a reference signal bundling pattern for receiving the DMRSs and the associated data channels, where the reference signal bundling pattern may indicate the bundling sequence. The UE may accordingly receive the DMRSs and the associated data channels and perform channel estimation on the data channels.