Channel estimation for two-stage sidelink control using sidelink data channel DMRS

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

• receiving, on a sidelink channel, one or more demodulation reference signals (DMRSs) for a sidelink data channel transmission via a set of one or more antenna ports;
• receiving a second stage of a two-stage sidelink control information (SCI) transmission using antenna ports from the set of one or more antenna ports and using a number of layers equal to a number of layers used for the sidelink data channel transmission;
• and
• demodulating the second stage of the two-stage SCI using the one or more DMRSs for the sidelink data channel transmission.

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

• at least one memory;
• and
• one or more processors coupled with the at least one memory and configured to cause the apparatus to:
• transmit one or more demodulation reference signals (DMRSs) for a sidelink data channel transmission via a set of one or more antenna ports, and
• transmit a second stage of a two-stage sidelink control information (SCI) transmission using antenna ports from the set of one or more antenna ports and using a number of layers equal to a number of layers used for the sidelink data channel transmission.

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

• at least one memory;
• and
• one or more processors coupled with the at least one memory and configured to cause the apparatus to:
• receive, on a sidelink channel, one or more demodulation reference signals (DMRSs) for a sidelink data channel transmission via a set of one or more antenna ports;
• receive a second stage of a two-stage sidelink control information (SCI) transmission using antenna ports from the set of antenna ports and using a number of layers equal to a number of layers used for the sidelink data channel transmission;
• and
• demodulate the second stage of the two-stage SCI using the one or more DMRSs for the sidelink data channel transmission.