Methods, systems, and devices for wireless communication are described. A base station supporting multimedia broadcast multicast service (MBMS) and operating in a shared radio frequency spectrum band may map MBMS transport blocks (TBs) to each carrier in the system bandwidth. The device may perform a clear channel assessment (CCA) on one or more of the carriers, and transmit a portion of the MBMS TBs on carriers with successful CCAs. The portion of the MBMS TBs mapped to carriers with unsuccessful CCAs may be punctured. In various examples, a single TB may be mapped across the carriers, different TBs may mapped to each carrier, or redundancy versions (RVs) may be mapped to each carrier. A region at the frequency boundary of each carrier may be reserved for a guard region, and may not be used for MBMS transmissions when a carrier is associated with a failed CCA.