Incremental redundancy initially uses a coding
scheme, such as MCS9, with very little error protection
and without consideration for the actual radio link
quality. When information is received incorrectly,
additional coding is transmitted and then soft
combined in the receiver with the previously received
information. Soft-combining increases the probability
of decoding the information. This procedure will be
repeated until the information is successfully decoded.
This means that information about the radio link is not
necessary to support incremental redundancy. For the
mobile stations, incremental redundancy support is
mandatory in the standard.