DEMODULATION REFERENCE SIGNAL RESOURCE ALLOCATION
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit, to a network entity, information associated with a virtual resource block to physical resource block (VRB-to-PRB) mapping for a demodulation reference signal (DMRS). The UE may receive, from the network entity, an indication to apply a frequency domain orthogonal cover code (FD-OCC) to the DMRS for every three resource elements or every six resource elements of the DMRS. The indication may relate to a DMRS configuration type that uses every other resource element within one or more symbols allocated to the DMRS. Numerous other aspects are described.
1 . An apparatus for wireless communication at a user equipment (UE), comprising:
one or more memories; and
one or more processors, coupled to the one or more memories, configured individually or collectively to:
transmit, to a network entity, information associated with a virtual resource block to physical resource block (VRB-to-PRB) mapping for a demodulation reference signal (DMRS); and
receive, from the network entity, an indication to apply a frequency domain orthogonal cover code (FD-OCC) to the DMRS for every three resource elements of the DMRS or every six resource elements of the DMRS.
2 . The apparatus of claim 1 , wherein the indication indicates to apply the FD-OCC to the DMRS for every three resource elements of the DMRS for a DMRS configuration type that uses every other resource element within one or more symbols allocated to the DMRS.
3 . The apparatus of claim 2 , wherein the DMRS configuration type supports six ports for a single symbol DMRS and twelve ports for a two symbol DMRS, wherein the six ports or the twelve ports are included in a code division multiplexing group.
4 . The apparatus of claim 1 , wherein the indication indicates to apply the FD-OCC to the DMRS for every six resource elements of the DMRS for a DMRS configuration type that uses every other resource element within one or more symbols allocated to the DMRS.
5 . The apparatus of claim 4 , wherein the DMRS configuration type supports twelve ports for a single symbol DMRS and twenty-four ports for a two symbol DMRS.
6 . The apparatus of claim 1 , wherein the information indicates that VRB-to-PRB interleaving is enabled, and wherein applying the FD-OCC to the DMRS enables each PRB of a plurality of PRBs associated with the DMRS to be contiguous in a frequency domain.
7 . A method of wireless communication performed by a user equipment (UE), comprising:
transmitting, to a network entity, information associated with a virtual resource block to physical resource block (VRB-to-PRB) mapping for a demodulation reference signal (DMRS); and
receiving, from the network entity, an indication to apply a frequency domain orthogonal cover code (FD-OCC) to the DMRS for every three resource elements of the DMRS or every six resource elements of the DMRS.
8 . The method of claim 7 , wherein the indication indicates to apply the FD-OCC to the DMRS for every three resource elements of the DMRS for a DMRS configuration type that uses every other resource element within one or more symbols allocated to the DMRS.
9 . The method of claim 8 , wherein the DMRS configuration type supports six ports for a single symbol DMRS and twelve ports for a two symbol DMRS, wherein the six ports or the twelve ports are included in a code division multiplexing group.
10 . The method of claim 7 , wherein the indication indicates to apply the FD-OCC to the DMRS for every six resource elements of the DMRS for a DMRS configuration type that uses every other resource element within one or more symbols allocated to the DMRS.
11 . The method of claim 10 , wherein the DMRS configuration type supports twelve ports for a single symbol DMRS and twenty-four ports for a two symbol DMRS.
12 . The method of claim 7 , wherein the information indicates that VRB-to-PRB interleaving is enabled, and wherein applying the FD-OCC to the DMRS enables each PRB of a plurality of PRBs associated with the DMRS to be contiguous in a frequency domain.
13 . A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising:
one or more instructions that, when executed by one or more processors of a user equipment (UE), cause the UE to:
transmit, to a network entity, information associated with a virtual resource block to physical resource block (VRB-to-PRB) mapping for a demodulation reference signal (DMRS); and
receive, from the network entity, an indication to apply a frequency domain orthogonal cover code (FD-OCC) to the DMRS for every three resource elements of the DMRS or every six resource elements of the DMRS.
14 . The non-transitory computer-readable medium of claim 13 , wherein the indication indicates to apply the FD-OCC to the DMRS for every three resource elements of the DMRS for a DMRS configuration type that uses every other resource element within one or more symbols allocated to the DMRS.
15 . The non-transitory computer-readable medium of claim 13 , wherein the indication indicates to apply the FD-OCC to the DMRS for every six resource elements of the DMRS for a DMRS configuration type that uses every other resource element within one or more symbols allocated to the DMRS.
16 . The non-transitory computer-readable medium of claim 14 , wherein the DMRS configuration type supports six ports for a single symbol DMRS and twelve ports for a two symbol DMRS, wherein the six ports or the twelve ports are included in a code division multiplexing group.
17 . The non-transitory computer-readable medium of claim 15 , wherein the DMRS configuration type supports twelve ports for a single symbol DMRS and twenty-four ports for a two symbol DMRS.
18 . The non-transitory computer-readable medium of claim 13 , wherein the information indicates that VRB-to-PRB interleaving is enabled, and wherein applying the FD-OCC to the DMRS enables each PRB of a plurality of PRBs associated with the DMRS to be contiguous in a frequency domain.
19 . The non-transitory computer-readable medium of claim 13 , wherein the indication is received from the network entity in downlink control information.
20 . The non-transitory computer-readable medium of claim 13 , wherein the information associated with the VRB-to-PRB mapping is transmitted to the network entity in uplink control information.
21 . The non-transitory computer-readable medium of claim 13 , wherein the DMRS is associated with a physical downlink shared channel (PDSCH) or a physical uplink shared channel (PUSCH).
22 . The non-transitory computer-readable medium of claim 13 , wherein the FD-OCC is applied to the DMRS for a code division multiplexing group.
23 . The non-transitory computer-readable medium of claim 13 , wherein the indication to apply the FD-OCC is based at least in part on a capability reported by the UE.
24 . The non-transitory computer-readable medium of claim 13 , wherein the indication to apply the FD-OCC is received as part of a radio resource control message.
25 . An apparatus for wireless communication, comprising:
means for transmitting, to a network entity, information associated with a virtual resource block to physical resource block (VRB-to-PRB) mapping for a demodulation reference signal (DMRS); and
means for receiving, from the network entity, an indication to apply a frequency domain orthogonal cover code (FD-OCC) to the DMRS for every three resource elements of the DMRS or every six resource elements of the DMRS.
26 . The apparatus of claim 25 , wherein the indication relates to a DMRS configuration type that uses every other resource element within one or more symbols allocated to the DMRS.
27 . The apparatus of claim 26 , wherein the DMRS configuration type supports six ports for a single symbol DMRS and twelve ports for a two symbol DMRS, wherein the six ports or the twelve ports are included in a code division multiplexing group.
28 . The apparatus of claim 25 , wherein the indication relates to applying the FD-OCC to the DMRS for every six resource elements of the DMRS.
29 . The apparatus of claim 28 , wherein the DMRS configuration type supports twelve ports for a single symbol DMRS and twenty-four ports for a two symbol DMRS.
30 . The apparatus of claim 25 , wherein the information received indicates that VRB-to-PRB interleaving is enabled, and wherein the indication to apply the FD-OCC to the DMRS specifies that each PRB of a plurality of PRBs associated with the DMRS is contiguous in a frequency domain.