Inter-UE coordination for sidelink enhancements
An apparatus for utilization in wireless communications comprises an antenna for use in transmission of electromagnetic signals, a memory for maintaining computer-readable code, and a processor for executing the computer-readable code. The processor causes the apparatus to transmit an indication including at least one of information that the first UE has been assigned a coordinating UE for coordination of sidelink transmissions of a plurality of additional UEs or information identifying an assigned coordinating UE, and transmit one or more groupcast transmission parameters for transmitting sidelink transmission parameters to the plurality of additional UEs.
1 . An apparatus for utilization in wireless communications, comprising:
an antenna for use in transmission of electromagnetic signals;
a memory for maintaining computer-readable code; and
a processor configured to execute the computer-readable code to cause the apparatus to:
receive one or more groupcast transmission parameters;
determine sidelink transmission parameters associated with one or more UEs, wherein the determined sidelink transmission parameters are to be used to avoid collision or half-duplex conflict in sidelink transmissions of the one or more UEs; and
transmit a groupcast message to the one or more UEs, wherein the groupcast message comprises the sidelink transmission parameters for the one or more UEs, and wherein transmission of the groupcast message is based on the received one or more groupcast transmission parameters,
wherein the sidelink transmission parameters include assistance information indicating a set of resources used by a certain UE and enabling the one or more UEs to select a set of resources to be used by the one or more UEs, and
wherein the sidelink transmission parameters comprise a set of resources preferred for the one or more UEs or a set of resources not preferred for the one or more UEs.
2 . The apparatus according to claim 1 , wherein the processor is configured to execute the computer-readable code to cause the apparatus to transmit the groupcast message at a predetermined time.
3 . The apparatus according to claim 1 , wherein the one or more groupcast transmission parameters include information to identify a schedule for transmission of the groupcast message.
4 . The apparatus according to claim 1 , wherein the processor is configured to execute the computer-readable code to cause the apparatus to identify at least a portion of the sidelink transmission parameters of the one or more UEs based on at least one previously received transmission from the one or more UEs.
5 . The apparatus according to claim 1 , wherein the processor is configured to execute the computer-readable code to cause the apparatus to receive an indication indicating that the apparatus is a coordinating UE for coordination of the sidelink transmissions of the one or more UEs, based on at least one of: receiving a radio resource control (RRC) message including information that the apparatus has been assigned as the coordinating UE, or receiving a downlink control information, a value of a field of the downlink control information including information indicating that the apparatus has been assigned as the coordinating UE.
6 . The apparatus according to claim 1 , wherein the processor is configured to execute the computer-readable code to cause the apparatus to determine the sidelink transmission parameters based on at least one of:
a result of sensing the sidelink transmission parameters of the one or more UEs; or
a predicted resource collision or a predicted half-duplex conflict in the sidelink transmissions.
7 . The apparatus according to claim 1 , wherein the processor is configured to execute the computer-readable code to cause the apparatus to determine the sidelink transmission parameters based on a detected resource collision or a detected half-duplex conflict in the sidelink transmissions.
8 . A method for mobile communications including sidelink transmissions, the method comprising:
receiving, by a first user equipment (UE), one or more groupcast transmission parameters;
determining, by the first UE, sidelink transmission parameters associated with one or more second UEs, wherein the determined sidelink transmission parameters are to be used to avoid collision or half-duplex conflict among sidelink transmissions of the one or more second UEs; and
transmitting, by the first UE, a groupcast message to the one or more second UEs, wherein the groupcast message comprises the sidelink transmission parameters for the one or more second UEs, and wherein transmission of the groupcast message is based on the received groupcast transmission parameters,
wherein the sidelink transmission parameters include assistance information indicating a set of resources used by a certain UE and enabling the one or more second UEs to select a set of resources to be used by the one or more second UEs, and
wherein the sidelink transmission parameters comprise a set of resources preferred for the one or more second UEs or a set of resources not preferred for the one or more second UEs.