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Option 7 relies on the 5G core (5GC).

The ng-eNB acts as an MN; it supports signaling (MCG signaling bearer) with the 5GC core network’s transport plane through the NG-C interface and exchanges data to the 5G core network’s user plane through the NG-U interface.

The gNB base station acts as an SN. It is controlled by the ng-eNB base station via the Xn-C interface.

The ng-eNB (4G base station) controls the gNB through the Xn interface.

The data is transmitted to the gNB entity via one of the following options (Figure 1.5):

1 – from the ng-eNB base station, which performs a split bearer. This is option 7 (MN terminated split bearer);

2 – from the 5G core network. This is option 7a (SCG bearer).

Figure 1.5. NE-DC architecture – option 7