MCS 6 Transport Block size for 1 RB?
I found an answer in the text of


  Long Term Evolution In Bullets, 2nd Edition


towards the back of the book (page 575).

It states:


  TBS index 6 for a single allocated Resource Block specifies a
  transport block size of 328 bits.  Table 387 indicates that TBS index
  6 uses QPSK as a modulation scheme so the capacity of a single
  Resource Block allocation over a subframe is (12*13-6) = 300 bits,
  when assuming a single OFDMA symbol is allocated to the PDCCH and the
  cell specific Reference Signal is transmitted for a single antenna
  port.  Thus, the transport block size of 328 bits cannot be fully
  accommodated by the Resource Block allocation.  The transport block
  size of 328 bits has been specified for the purposes of Voice over IP
  (VoIP) users allocated QPSK towards cell edge.  The use of a single
  Resource Block helps to maximise system capacity.  TTI bundling can be
  used to transfer the complete set of 328 bits by applying a different
  puncturing pattern for each transmission within the TTI bundle.