A core network node, e.g. MME, and a first radio network node, e.g., eNB, are comprised in a wireless communication network. The core network node receives information about capability of a communication device with regard to a maximum supported transport block size, “TBS”. The core network node transmits, to the first radio network node, information about a limitation of the capability of the communication device with regard to maximum supported TBS. The information about the limitation is based on the received information about capability.