Group common demodulation reference signals with time domain waveform
The apparatus is configured to transmit and/or receive GDMRS that may be scrambled based on a same scrambling identifier (ID) and shared for a plurality of UEs or channels. The apparatus, in some configurations, is further configured to multiplex, in time, data for the plurality of UEs or channels into different segments within each symbol in a set of symbols. The apparatus is further configured to transmit and/or receive the multiplexed data for the plurality of UEs or channels. In some configurations, the apparatus is further configured to demodulate the received data based on the GDMRS, and extract at least one segment for a UE or a plurality of channels associated with the apparatus within the demodulated data for subsequent decoding at the apparatus. In some configurations the extraction is based on a SLIV transmitted and/or received by the apparatus.
1. A method of wireless communication of a user equipment (UE), comprising:
receiving, from a base station, demodulation reference signals (DMRS), the DMRS being UE-set-specific to a plurality of UEs including the UE, the UE-set-specific DMRS being scrambled based on a same scrambling identifier (ID) and being shared for the plurality of UEs;
receiving, from the base station, data for the plurality of UEs multiplexed in time within each symbol of a set of symbols;
demodulating the received data based on the received UE-set-specific DMRS; and
extracting at least one segment for the UE within the demodulated data in each symbol of the set of symbols for subsequent decoding at the UE.
2. The method of claim 1 , wherein the received data includes a cyclic prefix (CP) and a segments portion, each segment in the segments portion excluding a CP.
3. The method of claim 1 , wherein the DMRS is received in a first set of resource blocks (RBs) and the data is received in a second set of RBs, and each RB of the first set of RBs and the second set of RBs extends over a portion of a symbol and spans a pre-configured bandwidth.
4. The method of claim 1 , further comprising:
receiving a start and length indicator value (SLIV) indicating a starting resource block (RB) and a number of RBs for the data, the SLIV having sub-symbol granularity, the data being received based on the received SLIV; and
receiving DMRS-location information indicating at least one RB for the DMRS, the DMRS being received based on the received DMRS-location information.
5. The method of claim 1 , further comprising:
receiving a start and length indicator value (SLIV) indicating a starting resource block (RB) and a number of RBs for both the DMRS and the data, the DMRS being at the starting RB, the SLIV having sub-symbol granularity, the DMRS and the data being received based on the received SLIV; and
receiving DMRS-to-data gap information indicating a gap between the DMRS at an end of the starting RB and the at least one segment within the data for the UE, the at least one segment being extracted based on the received DMRS-to-data gap information.
6. The method of claim 5 , further comprising receiving a DMRS configuration indicating RBs and resource elements (REs) for the DMRS within the number of RBs, the configuration being received through at least one of radio resource control (RRC) signaling, a media access control (MAC) control element (CE) (MAC-CE), or downlink control information (DCI), wherein the DMRS is received based on the received DMRS configuration.
7. The method of claim 1 , further comprising:
receiving a start and length indicator value (SLIV) indicating a starting resource block (RB) and a number of RBs for both the DMRS and the data, the DMRS being at the starting RB, the SLIV having sub-symbol granularity, the DMRS and the data being received based on the received SLIV; and
receiving at least one of time-domain interlace information or a virtual RB (VRB) to physical RB (PRB) mapping indicating the at least one segment for the UE within the data, the at least one segment being extracted based on the received at least one of the time-domain interlace information or the VRB to PRB mapping.
8. The method of claim 1 , further comprising:
receiving a first start and length indicator value (SLIV) indicating a starting resource block (RB) and a number of RBs for both the DMRS and the data, the first SLIV having sub-symbol granularity, the DMRS and the data being received based on the received first SLIV; and
receiving a second SLIV indicating a starting RB and a number of RBs for the at least one segment within the data for the UE, the at least one segment being extracted based on the received second SLIV.
9. An apparatus for wireless communication, the apparatus being a user equipment (UE) comprising:
a memory; and
at least one processor coupled to the memory and configured to:
receive, from a base station, demodulation reference signals (DMRS), the DMRS being UE-set-specific to a plurality of UEs including the UE, the UE-set-specific DMRS being scrambled based on a same scrambling identifier (ID) and being shared for the plurality of UEs;
receive, from the base station, data for the plurality of UEs multiplexed in time within each symbol of a set of symbols;
demodulate the received data based on the received UE-set-specific DMRS; and
extract at least one segment for the UE within the demodulated data in each symbol of the set of symbols for subsequent decoding at the UE.
10. The apparatus of claim 9 , wherein the received data includes a cyclic prefix (CP) and a segments portion, each segment in the segments portion excluding a CP.
11. The apparatus of claim 9 , wherein the DMRS is received in a first set of resource blocks (RBs) and the data is received in a second set of RBs, and each RB of the first set of RBs and the second set of RBs extends over a portion of a symbol and spans a pre-configured bandwidth.
12. The apparatus of claim 9 , wherein the at least one processor is further configured to:
receive a start and length indicator value (SLIV) indicating a starting resource block (RB) and a number of RBs for the data, the SLIV having sub-symbol granularity, the data being received based on the received SLIV; and
receive DMRS-location information indicating at least one RB for the DMRS, the DMRS being received based on the received DMRS-location information.
13. The apparatus of claim 9 , wherein the at least one processor is further configured to:
receive a start and length indicator value (SLIV) indicating a starting resource block (RB) and a number of RBs for both the DMRS and the data, the DMRS being at the starting RB, the SLIV having sub-symbol granularity, the DMRS and the data being received based on the received SLIV; and
receive DMRS-to-data gap information indicating a gap between the DMRS at an end of the starting RB and the at least one segment within the data for the UE, the at least one segment being extracted based on the received DMRS-to-data gap information.
14. The apparatus of claim 9 , wherein the at least one processor is further configured to:
receive a start and length indicator value (SLIV) indicating a starting resource block (RB) and a number of RBs for both the DMRS and the data, the DMRS being at the starting RB, the SLIV having sub-symbol granularity, the DMRS and the data being received based on the received SLIV; and
receive at least one of time-domain interlace information or a virtual RB (VRB) to physical RB (PRB) mapping indicating the at least one segment for the UE within the data, the at least one segment being extracted based on the received at least one of the time-domain interlace information or the VRB to PRB mapping.
15. The apparatus of claim 9 , wherein the at least one processor is further configured to:
receive a first start and length indicator value (SLIV) indicating a starting resource block (RB) and a number of RBs for both the DMRS and the data, the first SLIV having sub-symbol granularity, the DMRS and the data being received based on the received first SLIV; and
receive a second SLIV indicating a starting RB and a number of RBs for the at least one segment within the data for the UE, the at least one segment being extracted based on the received second SLIV.