Adaptive uplink SU-MIMO precoding in wireless cellular systems based on reception quality measurements

A method implemented in a network node that is configured to communicate with a wireless device, the method comprising:

• causing transmission of signaling of one or more uplink grants indicating a first exploration set of precoders for a first plurality of uplink transmissions, each precoder of the first exploration set of precoders being associated with an uplink transmission of the first plurality of uplink transmissions;
• determining a first plurality of reception quality metrics associated with the first plurality of uplink transmissions;
• determining a first precoder of the first exploration set of precoders based at least in part on the first plurality of reception quality metrics;
• selecting the first precoder of the first exploration set of precoders for uplink transmission based at least on the first precoder meeting a predefined exploitation selection criterion;
• and
• forming a second exploration set of precoders to be associated with a second plurality of uplink transmissions based at least on the first precoder failing to meet the predefined exploitation selection criterion;
• wherein each one of the first exploration set of precoders is one of equal in rank to a second precoder of the first exploration set of precoders and within one rank to the second precoder;
• and
• the second precoder corresponding to one of a previously selected precoder for uplink transmission during an exploitation phase and a precoder from a previous exploration set of precoders;
• wherein the first precoder is configured to be implemented for uplink transmission for an exploitation phase time period;
• wherein the exploitation phase time period is based on a reception quality metric performance loss associated with a previous exploration set of precoders.