Dual Connectivity (DC) seems to play important role in inter-working between LTE and NR. In this case, any RAT can act as master node, as described in earlier posts
To ease the implementation, i assume, LTE eNB is not synchronized with NR gNB in DC between LTE and NR deployment case.
Like in LTE, NR also supports Carrier Aggregation of carriers at lower layers. It is also referred DC as upper layer aggregation.
NR user plane protocol stack (below) containes New AS sublayer along with PDCP/RLC/MAC/PHY at UE side and they are terminated at gNB on the network side.
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