Techniques for control resource pool-gated data transmission

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

• one or more memories storing processor-executable code;
• and
• one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the apparatus to:
• receive, from a first UE, a first sidelink control information message during a first transmission time interval of a first resource pool, the first sidelink control information message indicating a data message to be transmitted by the first UE on a subchannel of a second resource pool;
• transmit a feedback message to the first UE for the first sidelink control information message during a second transmission time interval of the first resource pool;
• determine whether to monitor for the data message on the subchannel of the second resource pool based at least in part on the feedback message;
• identify a third transmission time interval of the first resource pool reserved by the first sidelink control information message;
• receive a retransmission of the first sidelink control information message during the third transmission time interval of the first resource pool based at least in part on the feedback message indicating a negative acknowledgment, the retransmission of the first sidelink control information message indicating the data message from the first UE on a second subchannel of the second resource pool;
• transmit a second feedback message to the first UE during a fourth transmission time interval of the first resource pool, the second feedback message indicating an acknowledgment for the retransmission of the first sidelink control information message;
• and
• receive the data message on the second subchannel of the second resource pool based at least in part on the second feedback message.

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

• transmitting a first sidelink control information message during a first transmission time interval of a first resource pool, the first sidelink control information message indicating a data message to be transmitted on a subchannel of a second resource pool to a second UE;
• receiving a feedback message from the second UE for the first sidelink control information message during a second transmission time interval of the first resource pool;
• determining whether to transmit the data message on the subchannel of the second resource pool based at least in part on the feedback message received from the second UE;
• reserving, based at least in part on transmitting the first sidelink control information message, a third transmission time interval of the first resource pool;
• transmitting a retransmission of the first sidelink control information message during the third transmission time interval of the first resource pool based at least in part on the feedback message indicating a negative acknowledgment, the retransmission of the first sidelink control information message indicating the data message to be transmitted on a second subchannel of the second resource pool to the second UE;
• receiving a second feedback message from the second UE during a fourth transmission time interval of the first resource pool, the second feedback message indicating an acknowledgment for the retransmission of the first sidelink control information message;
• and
• transmitting the data message on the second subchannel of the second resource pool based at least in part on the second feedback message.

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

• receiving, from a first UE, a first sidelink control information message during a first transmission time interval of a first resource pool, the first sidelink control information message indicating a data message to be transmitted by the first UE on a subchannel of a second resource pool;
• transmitting a feedback message to the first UE for the first sidelink control information message during a second transmission time interval of the first resource pool;
• determining whether to monitor for the data message on the subchannel of the second resource pool based at least in part on the feedback message;
• identifying a third transmission time interval of the first resource pool reserved by the first sidelink control information message;
• receiving a retransmission of the first sidelink control information message during the third transmission time interval of the first resource pool based at least in part on the feedback message indicating a negative acknowledgment, the retransmission of the first sidelink control information message indicating the data message from the first UE on a second subchannel of the second resource pool;
• transmitting a second feedback message to the first UE during a fourth transmission time interval of the first resource pool, the second feedback message indicating an acknowledgment for the retransmission of the first sidelink control information message;
• and
• receiving the data message on the second subchannel of the second resource pool based at least in part on the second feedback message.