One aspect of the disclosure provides a method for a terminal device in a wireless communications network, wherein the terminal device is configurable with a plurality of logical channel groups. The method comprises generating buffer status information and transmitting a message to a network node operative in the wireless communications network. The message comprises a buffer status report comprising the buffer status information. The buffer status report comprises respective indications, for each of the plurality of logical channel groups, of the availability of data to transmit in the terminal device for the logical channel group. The buffer status report further comprises respective buffer size fields, for one or more of the logical channel groups for which data is available to transmit, indicating an amount of data which is available to transmit.