Techniques for configuring search spaces for sidelink communication

An apparatus for wireless communications, comprising:

• at least one processor;
• and memory coupled to the at least one processor, the memory including instructions executable by the at least one processor to cause the apparatus to:
• detect, at a first user equipment (UE), a sidelink transmission from at least one second UE;
• identify a search space in available subchannels to decode based on the detection of the sidelink transmission, wherein the search space is a subset of subchannels from the available subchannels, and
• wherein the search space is two or more of:
• a common search space (CSS) that is globally common for a plurality of sidelink UEs,
• a transmitter UE dependent CSS (“Tx-dependent CSS”) that is configured based on at least one second UE's transmitter identification (“SL-Tx-ID”),
• sidelink configured CSS (“SL-configured CSS”) that is transmitted by a transmitting UE (“Tx-UE”) to a subset of UEs, wherein the SL-configured CSS is configured based on a seed selected by the Tx-UE, or
• a UE-specific search space (USS) configured for the first UE, wherein the USS is hashed based on first UE's receiver identification (“SL-Rx-UE ID”) or a link identification between the first UE and the second UE (“SL-Tx-Rx-Link ID”);
• and
• decode sidelink data transmitted from the at least one second UE based on identification of the search space.

A method for wireless communications, comprising:

• configuring, at a first user equipment (UE), a search space for transmission of sidelink data to one or more second UEs, wherein the search space is a subset of subchannels from available subchannels, and
• wherein the search space is two or more of:
• a common search space (CSS) that is globally common for a plurality of sidelink UEs,
• a transmitter UE dependent CSS (“Tx-dependent CSS”) that is configured based on first UE's transmitter identification (“SL-Tx-ID”),
• sidelink configured CSS (“SL-configured CSS”) that is transmitted by a transmitting UE (“Tx-UE”) to a subset of UEs, wherein the SL-configured CSS is configured based on a seed selected by the Tx-UE, or
• a UE-specific search space (USS) configured for at least one second UE, wherein the USS is hashed based on at least one second UE's receiver identification (“SL-Rx-UE ID”) or a link identification between the first UE and the second UE (“SL-Tx-Rx-Link ID”);
• and
• transmitting a sidelink data from the first UE to the at least one second UE within the search space configured by the first UE for the at least one second UE.

An apparatus for wireless communications, comprising:

• at least one processor;
• and memory coupled to the at least one processor, the memory including instructions executable by the at least one processor to cause the apparatus to:
• configure, at a first user equipment (UE), a search space for transmission of sidelink data to one or more second UEs, wherein the search space is a subset of subchannels from available subchannels, and
• wherein the search space is two or more of:
• a common search space (CSS) that is globally common for a plurality of sidelink UEs,
• a transmitter UE dependent CSS (“Tx-dependent CSS”) that is configured based on first UE's transmitter identification (“SL-Tx-ID”),
• sidelink configured CSS (“SL-configured CSS”) that is transmitted by a transmitting UE (“Tx-UE”) to a subset of UEs, wherein the SL-configured CSS is configured based on a seed selected by the Tx-UE, or
• a UE-specific search space (USS) configured for the at least one second UE, wherein the USS is hashed based on at least one second UE's receiver identification (“SL-Rx-UE ID”) or a link identification between the first UE and the second UE (“SL-Tx-Rx-Link ID”);
• and
• transmit a sidelink data from the first UE to the at least one second UE within the search space configured by the first UE for the at least one second UE.