Methods and apparatus for sidelink communications and resource allocation

A user equipment (UE), comprising:

• at least one processor;
• and
• a non-transitory computer readable storage medium storing programming for execution by the at least one processor, the programming including instructions for:
• transmitting, to a target UE, sidelink (SL) control information comprising a scheduling assignment (SA) indicating SL transmission resources for a SL data transmission, the SL transmission resources based on one or more occupied SL resources sensed by the UE, and the SL transmission resources including a first resource in a resource pool for an initial transmission and multiple different resources in the resource pool for one or more retransmissions,
• wherein the first resource includes a first time resource, a first frequency resource, or a first time-frequency resource, and
• wherein the multiple different resources include multiple time resources, multiple frequency resources, or multiple time-frequency resources;
• and
• transmitting the SL data transmission using the SL transmission resources according to the SL control information transmitted by the UE, wherein the SL control information and the SL data transmission are transmitted by the UE without receiving, in a downlink control information (DCI), a grant of communication resources.

A method, comprising:

• receiving, by a user equipment (UE) from a base station, a message indicating multiple sidelink (SL) communication resource configurations to be used by the UE for communicating SL control information and SL data between the UE and another UE;
• transmitting, by the UE, the SL control information to the another UE using a communication resource indicated by a SL communication resource configuration of the multiple SL communication resource configurations;
• and
• transmitting, by the UE, the SL data to the another UE using the communication resource indicated by the SL communication resource configuration,
• wherein the SL control information and the SL data are transmitted by the UE without the UE receiving, in a downlink control information (DCI), a grant of the communication resource.

A user equipment (UE), comprising:

• at least one processor;
• and
• a non-transitory computer readable storage medium storing programming for execution by the at least one processor, the programming including instructions to:
• receive, from a base station, a message indicating multiple sidelink (SL) communication resource configurations to be used by the UE for communicating SL control information and SL data between the UE and another UE;
• transmit the SL control information to the another apparatus LIE using a communication resource indicated by a SL communication resource configuration of the multiple SL communication resource configurations;
• and
• transmit the SL data to the another UE using the communication resource indicated by the SL communication resource configuration,
• wherein the SL control information and the SL data are transmitted by the UE without the UE receiving, in a downlink control information (DCI), a grant of the communication resource.