Downlink Control Information (DCI) Size Matching

A method, in a user equipment (UE), for determining downlink control information (DCI) sizes for monitoring by the UE in a cell, the method comprising:

• determining DCI sizes for monitoring by the UE;
• and
• monitoring, using the determined DCI sizes, one or more configured search spaces for DCI messages targeted to the UE,
• wherein determining DCI sizes for monitoring by the UE comprises:
• determining a preliminary size for DCI format 0_0 based on a first size of a frequency domain resource allocation (FDRA) field for DCI format 0_0, wherein the first size of the FRDA field for DCI format 0_0 depends on a size of an initial uplink bandwidth part (BWP);
• determining a size for DCI format 1_0 based on a first size of an FDRA field for DCI format 1_0, wherein:
• the first size of the FDRA field for DCI format 1_0 depends on a size of an initial downlink BWP if CORESET 0 is not configured in the cell;
• and
• the first size of the FDRA field for DCI format 1_0 depends on a size of CORESET 0 if CORESET 0 is configured in the cell;
• and
• determining an adjusted size for DCI format 0_0 based on a comparison of the preliminary size for DCI format 0_0 and the size for DCI format 1_0.

A user equipment (UE) for determining downlink control information (DCI) sizes for monitoring by the UE in a cell, the UE comprising:

• transceiver circuitry configured to communicate with a wireless communications system;
• and
• processing circuitry configured to:
• determine DCI sizes for monitoring by the UE;
• and
• monitor, using the determined DCI sizes, one or more configured search spaces for DCI messages targeted to the UE,
• wherein determining DCI sizes for monitoring by the UE comprises:
• determining a preliminary size for DCI format 0_0 based on a first size of a frequency domain resource allocation (FDRA) field for DCI format 0_0, wherein the first size of the FRDA field for DCI format 0_0 depends on a size of an initial uplink bandwidth part (BWP);
• determining a size for DCI format 1_0 based on a first size of an FDRA field for DCI format 1_0, wherein:
• the first size of the FDRA field for DCI format 1_0 depends on a size of an initial downlink BWP if CORESET 0 is not configured in the cell;
• and
• the first size of the FDRA field for DCI format 1_0 depends on a size of CORESET 0 if CORESET 0 is configured in the cell;
• and
• determining an adjusted size for DCI format 0_0 based on a comparison of the preliminary size for DCI format 0_0 and the size for DCI format 1_0.

A method, in a base station, for transmitting one or more downlink control information (DCI) messages to a user equipment (UE) in a cell, the method comprising:

• assembling one or more DCI messages;
• and
• transmitting the one or more assembled DCI messages to the UE in one or more search spaces configured for the UE,
• wherein assembling one or more DCI messages comprises:
• determining a preliminary DCI format 0_0 based on a first size of a frequency domain resource allocation (FDRA) field for DCI format 0_0, wherein the first size of the FRDA field for DCI format 0_0 depends on a size of an initial uplink bandwidth part (BWP);
• determining a DCI format 1_0 based on a first size of an FDRA field for DCI format 1_0, wherein:
• the first size of the FDRA field for DCI format 1_0 depends on a size of an initial downlink BWP if CORESET 0 is not configured in the cell;
• and
• the first size of the FDRA field for DCI format 1_0 depends on a size of CORESET 0 if CORESET 0 is configured in the cell;
• if a size of the preliminary DCI format 0_0 is smaller than a size of the DCI format 1_0, adding zeros to the preliminary DCI format 0_0 until the size of the preliminary DCI format 0_0 equals the size of the DCI format 1_0;
• and
• if the size of the preliminary DCI format 0_0 is larger than the size of the DCI format 1_0, truncating most significant bits of the FDRA field in the preliminary DCI format 0_0 until the size of the preliminary DCI format 0_0 is equal to the size of the DCI format 1_0.

A base station for transmitting one or more downlink control information (DCI) messages to a user equipment (UE) in a cell, the base station comprising:

• transceiver circuitry configured to communicate with the UE;
• and
• processing circuitry configured to:
• assemble one or more DCI messages;
• and
• transmit the one or more assembled DCI messages to the UE in one or more search spaces configured for the UE,
• wherein assembling one or more DCI messages comprises:
• determining a preliminary DCI format 0_0 based on a first size of a frequency domain resource allocation (FDRA) field for DCI format 0_0, wherein the first size of the FRDA field for DCI format 0_0 depends on a size of an initial uplink bandwidth part (BWP);
• determining a DCI format 1_0 based on a first size of an FDRA field for DCI format 1_0, wherein:
• the first size of the FDRA field for DCI format 1_0 depends on a size of an initial downlink BWP if CORESET 0 is not configured in the cell;
• and
• the first size of the FDRA field for DCI format 1_0 depends on a size of CORESET 0 if CORESET 0 is configured in the cell;
• if a size of the preliminary DCI format 0_0 is smaller than a size of the DCI format 1_0, adding zeros to the preliminary DCI format 0_0 until the size of the preliminary DCI format 0_0 equals the size of the DCI format 1_0;
• and
• if the size of the preliminary DCI format 0_0 is larger than the size of the DCI format 1_0, truncating most significant bits of the FDRA field in the preliminary DCI format 0_0 until the size of the preliminary DCI format 0_0 is equal to the size of the DCI format 1_0.