Exchanging quasi colocation information and acknowledging downlink control information

A base station (BS), comprising:

• a memory;
• at least one processor;
• and
• means for transmitting, to a user equipment (UE) on one or more downlink channels, one or more Downlink Control Informations (DCIs) that trigger transmission of a reference signal that includes Quasi Co-Location (QCL) information that indicates an association between a spatial parameter and a current transmission configuration,
• wherein any DCI triggering any reference signal that includes any QCL information is configured to trigger the UE to send an express acknowledgment or an implied acknowledgment to that DCI.

A user equipment (UE), comprising:

• a memory;
• at least one processor;
• and
• means for monitoring one or more downlink channels for one or more Downlink Control Informations (DCIs) that trigger transmission of a reference signal that includes Quasi Co-Location (QCL) information that indicates an association between a spatial parameter and a current transmission configuration,
• wherein any DCI triggering any reference signal that includes any QCL information is configured to trigger the UE to send an express acknowledgment or an implied acknowledgment to that DCI.

A base station (BS), comprising:

• a memory;
• and
• at least one processor coupled to the memory and configured to:
• transmit, to a user equipment (UE) on one or more downlink channels, one or more Downlink Control Informations (DCIs) that trigger transmission of a reference signal that includes Quasi Co-Location (QCL) information that indicates an association between a spatial parameter and a current transmission configuration,
• wherein any DCI triggering any reference signal that includes any QCL information is configured to trigger the UE to send an express acknowledgment or an implied acknowledgment to that DCI.

A user equipment (UE), comprising:

• a memory;
• and
• at least one processor coupled to the memory and configured to:
• monitor one or more downlink channels for one or more Downlink Control Informations (DCIs) that trigger transmission of a reference signal that includes Quasi Co-Location (QCL) information that indicates an association between a spatial parameter and a current transmission configuration,
• wherein any DCI triggering any reference signal that includes any QCL information is configured to trigger the UE to send an express acknowledgment or an implied acknowledgment to that DCI.