  In this work the undetected error probability performance of the proposed in
the technical specification of 5G new radio cyclic redundancy-check codes
taking into consideration that they have to work for fixed interval of lengths
are investigated. Codes of 6, 11 and 16 check bits with better error detection
performance than the proposed in the specification ones are suggested. For 24
check bits the 3 best CRC codes are presented, but no only one best for the
whole interval of lengths code was found.
