Scheduling restrictions for a physical downlink shared channel (PDSCH) demodulation reference signal (DMRS)
A system and a method are disclosed for processing a first PDSCH, the method includes processing the first PDSCH based on determining that one or more first restrictions apply to the first PDSCH, the one or more first restrictions including restricting a first allocation of resource blocks, such that a number of consecutively scheduled physical resource blocks (PRBs) in a bundle for the first PDSCH is even, or a number of common resource blocks (CRBs) offset from an initial CRB of a CRB grid for a set of consecutively scheduled PRBs for the first PDSCH is even.
1 . A method for processing, by a user equipment (UE), a first physical downlink shared channel (PDSCH), the method comprising:
processing, by the UE, the first PDSCH based on determining that one or more first restrictions apply to the first PDSCH, the one or more first restrictions comprising:
restricting a first allocation of resource blocks, such that:
a number of consecutively scheduled physical resource blocks (PRBs) in a bundle for the first PDSCH is even; and
a number of common resource blocks (CRBs) offset from an initial CRB of a CRB grid for a set of consecutively scheduled PRBs for the first PDSCH is even; and
based on an interleaved mapping of virtual resource blocks (VRBs) to PRBs being allowed, restricting a second allocation of resource blocks, such that only a one-to-one mapping of VRBs to PRBs is allowed.
2 . The method of claim 1 , further comprising processing a second PDSCH based on determining that one or more second restrictions apply to the second PDSCH, the one or more second restrictions comprising:
restricting a third allocation of resource blocks,
such that:
a number of CRBs to a starting PRB for the second PDSCH is even; or
a position of a BWP within a CRB grid for the second PDSCH starts and ends at a CRB index value that is an integer multiple of a resource block group (RBG); or
a position of allocated VRBs within the CRB grid starts and ends at a CRB index value that is an integer multiple of a resource block bundle (RBB) for the second PDSCH; or
a number of consecutively scheduled VRBs for the second PDSCH is even; or
a number of CRBs offset from the initial CRB of the CRB grid to a starting VRB for the second PDSCH is even; or
a number of consecutively scheduled VRBs for the second PDSCH is even; or
a number of CRBs or PRBs offset from the initial CRB of the CRB grid to the starting VRB for the second PDSCH is even.
3 . The method of claim 2 further comprising:
based on restricting the third allocation of resource blocks, such that only the one-to-one mapping of VRBs to PRBs is allowed, supporting FD-OCC length 4 eType 2 DMRS.
4 . The method of claim 1 , wherein the one or more first restrictions are applied based on determining that the UE associated with processing the first PDSCH is configured to process the first PDSCH only with restrictions.
5 . The method of claim 1 , wherein, based on determining that a second PDSCH corresponds to a frequency division multiplexing Scheme A (fdmSchemeA) transmission or a frequency-division multiplexing Scheme B (fdmSchemeB) transmission, processing the second PDSCH based on determining that one or more second restrictions apply to the second PDSCH, the one or more second restrictions comprising restricting a third allocation of resource blocks, such that:
a number of consecutively scheduled PRBs for the second PDSCH for a transmission-and-reception point/transmission configuration indicator (TRP/TCI) state is even; or
a number of PRBs offset from the initial CRB of the CRB grid for the second PDSCH to a TRP/TCI state is even; or
a multi-user, multiple input, multiple output (MU-MIMO) frequency division multiplexing (FDM)-based multi-TRP (MTRP) PDSCH is prevented for the second PDSCH; or
a number of consecutively scheduled PRBs for the second PDSCH for a TRP frequency-domain resource allocation is even; or
a number of PRBs offset from an initial CRB of the CRB grid for the second PDSCH to the TRP frequency-domain resource allocation is even.
6 . A system for processing a first physical downlink shared channel (PDSCH), the system comprising a UE comprising a processing circuit and memory comprising instructions that, when executed by the processing circuit, cause the UE to process the first PDSCH based on determining that one or more first restrictions apply to the first PDSCH, the one or more first restrictions comprising:
restricting a first allocation of resource blocks for the first PDSCH, such that:
a number of consecutively scheduled physical resource blocks (PRBs) in a bundle for the first PDSCH is even; and
a number of common resource blocks (CRBs) offset from an initial CRB of a CRB grid for a set of consecutively scheduled PRBs for the first PDSCH is even; and
based on an interleaved mapping of virtual resource blocks (VRBs) to PRBs being allowed, restricting a second allocation of resource blocks, such that only a one-to-one mapping of VRBs to PRBs is allowed.
7 . The system of claim 6 , wherein the instructions, when executed by the processing circuit, further cause the UE to process a second PDSCH based on determining that one or more second restrictions apply to the second PDSCH, the one or more second restrictions comprising:
restricting a third allocation of resource blocks for the second PDSCH, such that:
a number of consecutively scheduled VRBs for the second PDSCH is even; and
a number of CRBs or PRBs offset from an initial CRB of a CRB grid to a starting VRB for the second PDSCH is even.
8 . The system of claim 6 , wherein the instructions, when executed by the processing circuit, further cause the UE to process a second PDSCH based on determining that one or more second restrictions apply to the second PDSCH, the one or more second restrictions comprising:
based on the second PDSCH having a PRG size of 2, restricting a third allocation of resource blocks for the second PDSCH, such that a number of consecutively scheduled VRBs or PRBs for the first PDSCH is even.
9 . The system of claim 6 , wherein the instructions, when executed by the processing circuit, further cause the UE to process a second PDSCH based on determining that one or more second restrictions apply to the second PDSCH, the one or more second restrictions comprising restricting a third allocation of resource blocks for the second PDSCH, such that a number of common resource blocks (CRBs) to a starting PRB for the second PDSCH is even.
10 . The system of claim 6 , wherein the instructions, when executed by the processing circuit, further cause the UE to process a second PDSCH based on determining that one or more second restrictions apply to the second PDSCH, the one or more second restrictions comprising restricting a third allocation of resource blocks for the second PDSCH, such that a position of a bandwidth part (BWP) within a CRB grid for the second PDSCH starts and ends at a CRB index value that is an integer multiple of a resource block group (RBG).
11 . The system of claim 6 , wherein the instructions, when executed by the processing circuit, further cause the UE to process a second PDSCH based on determining that one or more second restrictions apply to the second PDSCH, the one or more second restrictions comprising restricting a third allocation of resource blocks for the second PDSCH, such that a position of allocated VRBs within a CRB grid for the second PDSCH starts and ends at a CRB index value that is an integer multiple of a resource block bundle (RBB).