Handling of impaired antenna branch

A network node for handling an impaired antenna branch at a radio transceiver device comprising a plurality of antenna branches, channel information being correlated among the respective antenna branches according to a correlation relation, the network node comprising:

• processing circuitry and;
• a storage medium for storing software instructions for execution by the processing circuitry, the processing circuitry being configured to cause the network node to:
• obtain an indication that at least one of the antenna branches at the radio transceiver device is impaired, the indication specifying that fewer than a threshold number of the antenna branches at the radio transceiver device is impaired, and in response thereto:
• obtain channel information for each non-impaired antenna branch of the plurality of antenna branches at the radio transceiver device;
• estimate channel information for each of the at least one impaired antenna branch using the obtained channel information and the correlation relation;
• obtain further channel information for all the antenna branches at the radio transceiver device;
• and
• update the correlation relation by training a machine learning model with the further channel information as input.

A non-transitory computer storage medium storing a computer program for handling an impaired antenna branch at a radio transceiver device comprising a plurality of antenna branches, channel information being correlated among the respective antenna branches according to a correlation relation, the computer program comprising computer code which, when run on processing circuitry of a network node, causes the network node to:

• obtain an indication that at least one of the antenna branches at the radio transceiver device is impaired, the indication specifying that fewer than a threshold number of the antenna branches at the radio transceiver device is impaired, and in response thereto:
• obtain channel information for each non-impaired antenna branch of the plurality of antenna branches at the radio transceiver device;
• estimate channel information for each of the at least one impaired antenna branch using the obtained channel information and the correlation relation;
• obtain further channel information for all the antenna branches at the radio transceiver device;
• and
• update the correlation relation by training a machine learning model with the further channel information as input.