A method of processing data for transmission in a wireless communications system, the method comprising identifying within the data a data frame having a protocol header, the protocol header comprising a plurality of protocol header fields and associated with a medium access control, MAC, frame format for data transmission within a local area network, LAN, determining a selected profile for header compression, the profile for header compression being selected from a plurality of predetermined profiles, each of the plurality of predetermined profiles specifying a subset of the plurality of protocol header fields, applying compression to a subset of the plurality of protocol header fields in accordance with the selected profile for header compression to form a compressed data frame for transmission on a wireless access interface of the wireless communications system, transmitting an indication of the selected profile for header compression, receiving a decompressor status indication, the decompressor status indication indicating whether an attempt to apply decompression to the compressed data frame to reconstruct the protocol header fields was successful, determining whether conditions for modifying the selected profile for header compression are satisfied, wherein the conditions for modifying the selected profile for header compression comprise conditions based on the received decompressor status, and, if so, identifying, within subsequent data, another data frame having a protocol header comprising the plurality of protocol header fields and being associated with the MAC frame format for data transmission within the LAN, determining a modified selected profile for header compression by selecting another one of the plurality of predetermined profiles, applying compression to a subset of the plurality of protocol header fields of the other data frame in the subsequent data in accordance with the modified selected profile for header compression to form another compressed data frame for transmission on the wireless access interface of the wireless communications system, and transmitting an indication of the modified selected profile for header compression. identifying within the data a data frame having a protocol header, the protocol header comprising a plurality of protocol header fields and associated with a medium access control, MAC, frame format for data transmission within a local area network, LAN, determining a selected profile for header compression, the profile for header compression being selected from a plurality of predetermined profiles, each of the plurality of predetermined profiles specifying a subset of the plurality of protocol header fields, applying compression to a subset of the plurality of protocol header fields in accordance with the selected profile for header compression to form a compressed data frame for transmission on a wireless access interface of the wireless communications system, transmitting an indication of the selected profile for header compression, receiving a decompressor status indication, the decompressor status indication indicating whether an attempt to apply decompression to the compressed data frame to reconstruct the protocol header fields was successful, determining whether conditions for modifying the selected profile for header compression are satisfied, wherein the conditions for modifying the selected profile for header compression comprise conditions based on the received decompressor status, and, if so, identifying, within subsequent data, another data frame having a protocol header comprising the plurality of protocol header fields and being associated with the MAC frame format for data transmission within the LAN, determining a modified selected profile for header compression by selecting another one of the plurality of predetermined profiles, applying compression to a subset of the plurality of protocol header fields of the other data frame in the subsequent data in accordance with the modified selected profile for header compression to form another compressed data frame for transmission on the wireless access interface of the wireless communications system, and transmitting an indication of the modified selected profile for header compression.