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UTRAN Iub Interface General Frame Structure


The general structure of a Common Transport Channel frame between Node B and RNC consists of a header and a payload.


Header
Payload: Data or Control Information

General Frame Structure


There are two types of frames (indicated by the Frame Type field).
  • Data frame.
  • Control frame.

     general frame structure
    The general structure of frames



    Data frame example:

    DSCH frame structure

    DL FDD DSCH data frame structure

    CRC
    FT
    CFN
    TFI
    SF
    SP
    MC Info

    TB
    Cyclic Redundancy Checksum
    Frame Type
    Connection Frame Number
    Transport Format Indicator
    Spreading Factor
    Spare
    Multi Code to indicate the number of parallel PDSCH codes
    on which the DSCH data will be carried
    Transport Block


    Control frame example:

    CTCH frame structure

    Iub Common Transport Channel Control Frame Format


    Further reading: 3GPP TS 25.435


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