SUL (Supplementary Uplink) in LTE

LTE
#1

Dear Experts

Can we use Supplementary Uplink in 4G just like we use in 5G. Like if i want DL on 2300 band and UL on 1800/2100 band?

#2

I believe it’s a 5G NR concept.

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#3

When is Supplementary Uplink and Downlink used in 5G?