Augmented sidelink control information for wireless communications

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

• receiving, using a first subchannel of a shared radio frequency spectrum band, a first sidelink control message reserving a first set of resources for a sidelink data message between a first UE and the second UE, the first set of resources comprising a first subset of resources for transmission of the sidelink data message and a second subset of resources for reception of the sidelink data message;
• receiving a second sidelink control message that indicates a second set of resources of the shared radio frequency spectrum band for data communications are reserved for reception of the data communications at the first UE in accordance with an availability status of the second set of resources, wherein the second set of resources comprises at least the second subset of resources;
• and
• communicating the sidelink data message with the first UE, wherein communicating comprises transmitting the sidelink data message using the first subset of resources or receiving the sidelink data message using the second subset of resources.

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

• receiving, using a first subchannel of a shared radio frequency spectrum band, a first sidelink control message reserving a first set of resources for a first sidelink data message between a first UE and a third UE;
• receiving a second sidelink control message that indicates a second set of resources of the shared radio frequency spectrum band for data communications and an availability status of the second set of resources;
• selecting a third set of resources for a second sidelink data message between the second UE and a fourth UE based at least in part on the first sidelink control message and the second sidelink control message, the third set of resources comprising a first subset of resources for transmission of the second sidelink data message and a second subset of resources for reception of the second sidelink data message;
• and
• communicating the second sidelink data message with the fourth UE, wherein communicating comprises transmitting the second sidelink data message using the first subset of resources or receiving the second sidelink data message using the second subset of resources.

An apparatus for wireless communications at a first user equipment (UE), comprising:

• a processor;
• memory coupled with the processor;
• and
• instructions stored in the memory and executable by the processor to cause the apparatus to:
• transmit, using a first subchannel of a shared radio frequency spectrum band, a first sidelink control message reserving a first set of resources of the shared radio frequency spectrum band for sidelink communications, the first set of resources comprising a first subset of resources for transmission of a sidelink data message between the first UE and a second UE and a second subset of resources for reception of the sidelink data message;
• transmit a second sidelink control message that indicates to at least a third UE that a second set of resources of the shared radio frequency spectrum band for data communications are reserved for reception of the data communications at the first UE in accordance with an availability status of the second set of resources, wherein the second set of resources comprises at least the second subset of resources;
• and
• communicate the sidelink data message with the second UE, wherein communicating comprises transmitting the sidelink data message using the first subset of resources or receiving the sidelink data message using the second subset of resources.