Selecting a modulation table to mitigate 5G message faults

A method for selecting a new modulation table, different from a current modulation table, comprising:

• a. receiving a faulted message, the faulted message modulated using a current modulation table;
• b. receiving a non-faulted message;
• c. comparing each symbol of the faulted message with a corresponding symbol of the non-faulted message;
• d. determining at least one symbol of the faulted message that differs from the corresponding symbol of the non-faulted message;
• e. determining whether the differing symbols are modulated according to:
• i. respective members of adjacent amplitude levels;
• ii. respective members of adjacent phase levels;
• iii. respective members of a high-amplitude portion of the current modulation table;
• and
• iv. respective members of a low-amplitude portion of the current modulation table.

A method for adjusting a particular amplitude level in a modulation table having Namp amplitude levels and Nphase phase levels and Nstates states, each state determined by one of the amplitude levels and one of the phase levels respectively, comprising:

• a. varying the particular amplitude level while keeping at least two other amplitude levels unchanged;
• b. detecting an adjacent-amplitude fault comprising a wireless message symbol modulated according to a first amplitude level and demodulated according to a second amplitude level adjacent or next to the first amplitude level;
• c. determining a first number or rate Famp of adjacent-amplitude faults;
• d. varying the particular amplitude level in a first direction, the first direction being either an increase or a decrease in the particular amplitude level;
• and then
• e. determining a second Famp subsequent to the varying.

A method for adjusting a particular amplitude level in a modulation table having Namp amplitude levels and Nphase phase levels and Nstates states, each state determined by one of the amplitude levels and one of the phase levels respectively, comprising:

• a. varying the particular amplitude level while keeping at least two other amplitude levels unchanged:
• b. measuring a message failure rate during a time interval;
• c. changing the particular amplitude level in a first direction, the first direction being an increase or a decrease of the particular amplitude level;
• d. then measuring the message failure rate again and determining whether the message failure rate has increased or decreased;
• e. upon determining that the message failure rate has decreased, changing the particular amplitude level further in the first direction;
• and
• Men upon determining that the message failure rate has increased, changing the particular amplitude level in a second direction opposite to the first direction.

A wireless network comprising a base station and a plurality of user nodes configured to transmit and receive wireless messages comprising symbols modulated according to a current modulation table, wherein the base station is configured to:

• a. detect a message failure;
• b. determine one or more symbol modulation faults in the failed message;
• c. determine a modulation fault type for each symbol modulation fault by comparing symbols of the failed message with symbols of a corresponding successful message;
• and
• d. select a new modulation table according to the modulation fault type or types so detected.