Interpreting multiplexed HARQ feedback data

A non-transitory computer readable medium comprising computer-executable instructions that, when executed on a processing unit included in a radio base station, cause the radio base station to:

• receive, in response to a downlink transmission, a multiplexed Hybrid Automatic Repeat Request, HARQ, feedback data set from the wireless communication device;
• acquire information indicating each possible combination of reception status of Downlink Control Information, DCI, and decoding status for associated Physical Downlink Shared Channel, PDSCH, data received at the wireless communication device for the number of DCIs being included with the downlink transmission, the information further indicating a multiplexed HARQ feedback data set transmitted by the wireless communication device for each of the combinations and whether or not there is ambiguity as to if one or more Negative Acknowledgements, NACKs, of a multiplexed HARQ feedback data set associated with each of the combinations is a result of failed decoding of PDSCH data or of non-reception of one or more DCIs utilized to schedule the PDSCH data at the wireless communication device;
• determine whether the received multiplexed HARQ feedback data set includes one or more NACKs indicated to be ambiguous, and
• in response to determining that the received multiplexed HARQ feedback data set includes one or more NACKs indicated to be ambiguous, compute, for each received NACK determined to indicate ambiguity, a weight indicating probability that the NACK is a result of failed decoding of PDSCH data, based on the acquired information.

A radio base station configured to interpret multiplexed Hybrid Automatic Repeat Request, HARQ, feedback data received from a wireless communication device in response to a downlink transmission to the wireless communication device, the radio base station comprising a processing unit and a memory, said memory containing instructions executable by said processing unit, whereby the radio base station is operative to:

• receive, in response to a downlink transmission, a multiplexed HARQ feedback data set from the wireless communication device;
• acquire information indicating each possible combination of reception status of Downlink Control Information, DCI, and decoding status for associated Physical Downlink Shared Channel, PDSCH, data received at the wireless communication device for the number of DCIs being included with the downlink transmission, the information further indicating a multiplexed HARQ feedback data set transmitted by the wireless communication device for each of the combinations and whether or not there is ambiguity as to if one or more Negative Acknowledgements, NACKs, of a multiplexed HARQ feedback data set associated with each of the combinations is a result of failed decoding of PDSCH data or of non-reception of one or more DCIs utilized to schedule the PDSCH data at the wireless communication device;
• determine whether the received multiplexed HARQ feedback data set includes one or more NACKs indicated to be ambiguous, and to
• in response to determining that the received multiplexed HARQ feedback data set includes one or more NACKs indicated to be ambiguous, compute, for each received NACK determined to indicate ambiguity, a weight indicating probability that the NACK is a result of failed decoding of PDSCH data, based on the acquired information.