channel 映射

• NR does not use (has no) CRS (Cell Specific Reference Signal)
• NR PDCCH requires DMRS whereas LTE PDCCH does not use DMRS. This is understandable because NR PDCCH would require its own reference signal (DMRS) since there is no CRS.
• NR PSCCH requires DMRS whereas LTE PDSCH does not use DMRS. This is understandable because NR PDSCH would require its own reference signal (DMRS) since there is no CRS.