Techniques for single-DCI switching for downlink and uplink bandwidth parts and sub-bands

A network node for wireless communications, comprising:

• one or more processors;
• memory coupled with the one or more processors;
• and
• instructions stored in the memory and executable by the one or more processors to cause the network node to:
• transmit, to a user equipment (UE), control signaling indicating a first downlink bandwidth part and a first uplink bandwidth part, or a first downlink sub-band and a first uplink sub-band, or both, for performing sub-band full-duplex communications, or both;
• transmit, to the UE, a downlink control information message indicating to switch to a second downlink bandwidth part and a second uplink bandwidth part, or to switch to a second downlink sub-band and a second uplink sub-band, or both, wherein the downlink control information message indicates:
• one or more bandwidth part indicator field values indicating one of the second downlink bandwidth part or the second uplink bandwidth part;
• and
• one or more additional bit field values indicating an other of the second downlink bandwidth part or the second uplink bandwidth part, wherein:
• the one or more additional bit field values indicate the other of the second downlink bandwidth part or the second uplink bandwidth part based at least in part on the one or more bandwidth part indicator field values indicating the one of the second downlink bandwidth part or the second uplink bandwidth part, and
• the one or more additional bit field values indicate the other of the second downlink bandwidth part or the second uplink bandwidth part further based at least in part on whether the downlink control information message schedules data at the UE;
• and
• perform full-duplex communications with the UE within the second downlink bandwidth part and the second uplink bandwidth part, or within the second downlink sub-band and the second uplink sub-band, or both.

A method for wireless communication at a user equipment (UE), comprising:

• receiving, from a network node, control signaling indicating a first downlink bandwidth part and a first uplink bandwidth part, or a first downlink sub-band and a first uplink sub-band, or both, for performing sub-band full-duplex communications;
• receiving, from the network node, a downlink control information message indicating to switch to a second downlink bandwidth part and a second uplink bandwidth part, or to switch to a second downlink sub-band and a second uplink sub-band, or both, wherein the downlink control information message indicates:
• one or more bandwidth part indicator field values indicating one of the second downlink bandwidth part or the second uplink bandwidth part;
• and
• one or more additional bit field values indicating an other of the second downlink bandwidth part or the second uplink bandwidth part, wherein:
• the one or more additional bit field values indicate the other of the second downlink bandwidth part or the second uplink bandwidth part based at least in part on the one or more bandwidth part indicator field values indicating the one of the second downlink bandwidth part or the second uplink bandwidth part, and
• the one or more additional bit field values indicate the other of the second downlink bandwidth part or the second uplink bandwidth part further based at least in part on whether the downlink control information message schedules data at the UE;
• and
• performing full-duplex communications with the network node within the second downlink bandwidth part and the second uplink bandwidth part, or within the second downlink sub-band and the second uplink sub-band, or both.

A method for wireless communication at a network node, comprising:

• transmitting, to a user equipment (UE), control signaling indicating a first downlink bandwidth part and a first uplink bandwidth part, or a first downlink sub-band and a first uplink sub-band, or both, for performing sub-band full-duplex communications, or both;
• transmitting, to the UE, a downlink control information message indicating to switch to a second downlink bandwidth part and a second uplink bandwidth part, or to switch to a second downlink sub-band and a second uplink sub-band, or both, wherein the downlink control information message indicates:
• one or more bandwidth part indicator field values indicating one of the second downlink bandwidth part or the second uplink bandwidth part;
• and
• one or more additional bit field values indicating an other of the second downlink bandwidth part or the second uplink bandwidth part, wherein:
• the one or more additional bit field values indicate the other of the second downlink bandwidth part or the second uplink bandwidth part based at least in part on the one or more bandwidth part indicator field values indicating the one of the second downlink bandwidth part or the second uplink bandwidth part, and
• the one or more additional bit field values indicate the other of the second downlink bandwidth part or the second uplink bandwidth part further based at least in part on whether the downlink control information message schedules data at the UE;
• and
• performing full-duplex communications with the UE within the second downlink bandwidth part and the second uplink bandwidth part, or within the second downlink sub-band and the second uplink sub-band, or both.