Capacity enhancement for a sidelink feedback channel

The UE of claim 0, wherein the feedback communication is associated with a physical sidelink feedback channel format 2 communication.

The UE of claim 0, wherein the feedback resource spans multiple contiguous symbols within a slot.

The UE of claim 0, wherein a quantity of the multiple contiguous symbols is either preconfigured or indicated via a radio resource control communication and associated with a resource pool associated with the feedback communication.

The UE of claim 0, wherein the one or more processors are further configured to receive a configuration of a resource pool associated with the feedback communication, wherein a size of the resource pool is based at least in part on the eight-level CDM scheme.

The UE of claim 0, wherein the eight-level CDM scheme is associated with a time domain orthogonal cover code (TD-OCC) scheme and a frequency domain orthogonal cover code (FD-OCC) scheme.

The UE of claim 0, wherein the eight-level CDM scheme is associated with one of:

• a two-level TD-OCC scheme and a four-level FD-OCC scheme, or
• a four-level TD-OCC scheme and a two-level FD-OCC scheme.

The UE of claim 0, wherein the feedback communication includes demodulation reference signal (DMRS) information that is frequency division multiplexed with feedback information, and wherein the TD-OCC scheme and the FD-OCC scheme are applied to both the DMRS information and the feedback information.

The UE of claim 0, wherein the eight-level CDM scheme is associated with a first-step frequency domain orthogonal cover code (FD-OCC) scheme and a second-step FD-OCC scheme.

The UE of claim 0, wherein the first-step FD-OCC scheme is associated with a two-level FD-OCC scheme, and wherein the second-step FD-OCC scheme is associated with a four-level FD-OCC scheme.

The UE of claim 0, wherein the feedback communication includes demodulation reference signal (DMRS) information that is frequency division multiplexed with feedback information, wherein the first-step FD-OCC scheme and the second-step FD-OCC scheme are applied to the feedback information, and wherein a time domain orthogonal cover code (TD-OCC) scheme and another FD-OCC scheme are applied to the DMRS information.

The UE of claim 0, wherein the one or more processors are further configured to transmit the feedback communication using a scheduled interlace associated with the feedback resource, wherein the scheduled interlace is associated with multiple non-contiguous physical resource blocks (PRBs).

The UE of claim 0, wherein the eight-level CDM scheme is associated with a frequency division orthogonal cover code (FD-OCC) scheme, and wherein the feedback communication is transmitted using FD-OCC cycling such that an FD-OCC sequence changes between subsequent PRBs, of the multiple non-contiguous PRBs.

The UE of claim 0, wherein an FD-OCC sequence index associated with a corresponding FD-OCC sequence in a corresponding PRB, of the multiple non-contiguous PRBs, is determined based at least in part on an FD-OCC-cycling formula.

The UE of claim 0, wherein the FD-OCC-cycling formula is based at least in part on a length of the corresponding FD-OCC sequence and an initial FD-OCC sequence index.

The UE of claim 0, wherein transmitting the feedback communication is further based at least in part on using eight-level code division multiplexing to generate the feedback communication.

The UE of claim 0, wherein the multiple sub-PRB interlaces include two sub-PRB interlaces within one PRB, wherein each sub-PRB interlace within the one PRB is associated with six contiguous resource elements.

The UE of claim 0, wherein transmitting the feedback communication is further based at least in part on using four-level code division multiplexing and four-level frequency division multiplexing to generate the feedback communication.

The UE of claim 0, wherein the multiple sub-PRB interlaces include four sub-PRB interlaces within one PRB, wherein each sub-PRB interlace within the one PRB is associated with three contiguous resource elements.

The UE of claim 0, wherein an indication of whether to implement sub-PRB interlacing is either preconfigured at the UE or indicated via a radio resource control communication.

The UE of claim 0, wherein the one or more processors are further configured to receive an indication of the sub-PRB interlace.

The UE of claim 0, wherein the one or more processors are further configured to map a sidelink data communication to the sub-PRB interlace.

The UE of claim 0, wherein a first subset of the multiple partial interlace groups are associated with a physical sidelink feedback channel (PSFCH) format 0 communication, and wherein a second subset of the multiple partial interlace groups are associated with a PSFCH format 2 communication.

The UE of claim 0, wherein the TD-OCC scheme is one of a two-level TD-OCC scheme or a four-level TD-OCC scheme.

The UE of claim 0, wherein the one or more processors are further configured to receive a configuration of a resource pool associated with the feedback communication, wherein a size of the resource pool is based at least in part on a number of levels associated with the TD-OCC scheme.

A method of wireless communication performed by a user equipment (UE), comprising:

• receiving a configuration of a feedback resource associated with a sidelink feedback channel, wherein the feedback resource is associated with an eight-level code division multiplexing (CDM) scheme;
• and
• transmitting a feedback communication associated with a sidelink data communication using the feedback resource, wherein transmitting the feedback communication is based at least in part on using the eight-level CDM scheme to generate the feedback communication.

36-40. (canceled)