Extended demodulation reference signal scrambling identifier for demodulation reference signal communication

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a base station (BS), information identifying a quantity of demodulation reference signal (DMRS) sequences supported per antenna panel of the BS. The UE may transmit a DMRS communication having one or more DMRS sequences configured based at least in part on the quantity of DMRS sequences supported per antenna panel and scrambled using an extended DMRS scrambling identifier that is based at least in part on a physical random access channel preamble. Numerous other aspects are provided.

What is claimed is: 
     
         1 . A user equipment (UE) for wireless communication, comprising:
 one or more memories; and   one or more processors coupled with the one or more memories, the one or more processors configured to:
 receive, from a network entity, information identifying a quantity of demodulation reference signal (DMRS) sequences supported per antenna panel of the network entity; and 
 transmit a DMRS communication having one or more DMRS sequences configured based at least in part on the quantity of DMRS sequences supported per antenna panel and scrambled using a DMRS scrambling identifier. 
   
     
     
         2 . The UE of  claim 1 , wherein the DMRS scrambling identifier is based at least in part on a physical random access channel preamble. 
     
     
         3 . The UE of  claim 2 , wherein the one or more processors are further configured to:
 utilize a scrambling sequence based at least in part on the physical random access channel preamble to scramble bits of a payload and cyclic redundancy check.   
     
     
         4 . The UE of  claim 2 , wherein the DMRS communication is associated with an uplink shared channel of a physical random access channel message associated with the physical random access channel preamble. 
     
     
         5 . The UE of  claim 1 , wherein the DMRS scrambling identifier is based at least in part on a physical uplink shared channel (PUSCH) scrambling identifier. 
     
     
         6 . The UE of  claim 1 , wherein the DMRS scrambling identifier is based at least in part on a radio network temporary identifier. 
     
     
         7 . The UE of  claim 1 , wherein the one or more processors, to transmit the DMRS communication, are configured to:
 transmit the DMRS communication based at least in part on configuring the one or more DMRS sequences for the DMRS communication.   
     
     
         8 . The UE of  claim 7 , wherein the one or more processors, to configure the one or more DMRS sequences, are configured to:
 generate a waveform for the DMRS communication,   wherein the waveform for the DMRS communication is a cyclic-prefix orthogonal frequency division multiplexing (CP-OFDM) waveform or a discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) waveform.   
     
     
         9 . The UE of  claim 1 , wherein the quantity of DMRS sequences supported per antenna panel is 4 or 8. 
     
     
         10 . The UE of  claim 1 , wherein a DMRS pattern of the one or more DMRS sequences is a Type-I DMRS pattern or a Type-II DMRS pattern. 
     
     
         11 . The UE of  claim 1 , wherein the DMRS scrambling identifier is configured on a per antenna port basis via a system information or radio resource control transmission. 
     
     
         12 . The UE of  claim 1 , wherein the one or more processors are further configured to:
 map a random access channel preamble to a physical uplink shared channel (PUSCH) resource unit including the one or more DMRS sequences in connection with a mapping ratio within a mapping period between the random access channel preamble and the PUSCH resource unit.   
     
     
         13 . The UE of  claim 12 , wherein the one or more processors are further configured to:
 determine the mapping ratio based at least in part on at least one of:
 a received system information transmission from the network entity, 
 a received radio resource control transmission from the network entity, 
 a set of validation rules, or 
 a mapping order. 
   
     
     
         14 . The UE of  claim 12 , wherein the mapping ratio is defined for a physical uplink shared channel (PUSCH) configuration, such that each PUSCH configuration, of a plurality of PUSCH configurations, in an initial or active bandwidth part is associated with a single mapping ratio. 
     
     
         15 . The UE of  claim 12 , wherein the mapping period is based at least in part on a synchronization signal block to random access channel occasion association pattern period. 
     
     
         16 . A method of wireless communication performed by a user equipment (UE), comprising:
 receiving, from a network entity, information identifying a quantity of demodulation reference signal (DMRS) sequences supported per antenna panel of the network entity; and   transmitting a DMRS communication, with one or more DMRS sequences configured based at least in part on the quantity of DMRS sequences supported per antenna panel and scrambled using a DMRS scrambling identifier.   
     
     
         17 . The method of  claim 16 , wherein the DMRS scrambling identifier is based at least in part on a physical random access channel preamble. 
     
     
         18 . The method of  claim 17 , further comprising:
 utilizing a scrambling sequence based at least in part on a physical random access channel preamble to scramble bits of a payload and cyclic redundancy check.   
     
     
         19 . The method of  claim 16 , further comprising:
 generating a waveform for the DMRS communication,
 wherein the waveform for the DMRS communication is a cyclic-prefix orthogonal frequency division multiplexing (CP-OFDM) waveform or a discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) waveform. 
   
     
     
         20 . The method of  claim 16 , wherein a DMRS pattern of the one or more DMRS sequences is a Type-I DMRS pattern or a Type-II DMRS pattern.