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5G Overhead is almost half 4G, and the mean reason behind that 5G has no Cell Specific Reference Signal as 4G
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As you know that CRS was all the time transmitted “Always on” over the entire BW and consume a large number of resource elements within the Resource block
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While 5G uses DMRS for channel demodulation instead of CRS.
PDSCH DMRS offers much less overhead compared to CRS due to the following: -
DMRS is transmitted within the set of RBs allocated to PDSCH. i.e, if a UE is allocated 10RBs for PDSCH, then both PDSCH and DMRS will be transmitted across those BW
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DMRS Configuration type 1 uses 6 RS within one or two symbols, which adds around 3.6% up to 7% overhead to 5G, while 4G offers from 9% to 17% overhead.
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