Resource selection with sidelink receiver sensing

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

• receiving, from a second UE, a second sidelink message over a sidelink channel, the second sidelink message comprising an indication of first resources of the sidelink channel, wherein the second sidelink message indicates that the first resources are available for selection by the first UE for a fourth sidelink message to the second UE or not available for selection by the first UE for the fourth sidelink message;
• selecting second resources of the sidelink channel for the fourth sidelink message to the second UE based at least in part on the first resources and the indication that the first resources are available for selection by the first UE for the fourth sidelink message or not available for selection by the first UE for the fourth sidelink message;
• transmitting, to the second UE, a third sidelink message over the sidelink channel, wherein the third sidelink message reserves the second resources for the fourth sidelink message to the second UE;
• and
• transmitting, to the second UE, the fourth sidelink message over the second resources reserved by the first UE, wherein the fourth sidelink message comprises data for the second UE.

An apparatus for wireless communication 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:
• receive a first sidelink message from a second UE over a sidelink channel, the first sidelink message comprising an indication of first resources of the sidelink channel reserved by the second UE for a fifth sidelink message by the second UE to a third UE;
• transmit, to a fourth UE, a second sidelink message over the sidelink channel, the second sidelink message comprising an indication of second resources of the sidelink channel, wherein the second sidelink message indicates that the second resources are available for selection by the fourth UE for a fourth sidelink message to the first UE or not available for selection by the fourth UE for the fourth sidelink message;
• receive a third sidelink message from the fourth UE based at least in part on transmitting the second sidelink message to the fourth UE, wherein the third sidelink message allocates third resources of the sidelink channel for the fourth sidelink message;
• and
• receive, from the fourth UE, the fourth sidelink message over the third resources of the sidelink channel reserved by the fourth UE based at least in part on transmitting the second sidelink message to the fourth UE, the fourth sidelink message comprising data for the first UE.

An apparatus for wireless communication 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:
• receive, from a second UE, a second sidelink message over a sidelink channel, the second sidelink message comprising an indication of first resources of the sidelink channel, wherein the second sidelink message indicates that the first resources are available for selection by the first UE for a fourth sidelink message to the second UE or not available for selection by the first UE for the fourth sidelink message;
• select second resources of the sidelink channel for the fourth sidelink message to the second UE based at least in part on the first resources and the indication that the first resources are available for selection by the first UE for the fourth sidelink message or not available for selection by the first UE for the fourth sidelink message;
• transmit, to the second UE, a third sidelink message over the sidelink channel, wherein the third sidelink message reserves the second resources for the fourth sidelink message to the second UE;
• and
• transmit, to the second UE, the fourth sidelink message over the second resources reserved by the first UE, wherein the fourth sidelink message comprises data for the second UE.