5GC NG-C NG-U Option 2 EPC S1-C S1-U gNB LTE eNB gNB EPC LTE eNB gNB Figure 1.80 Option 3 5GC S1-C S1-U S1-U NG-C NG-U ng-eNB gNB Option 3A Option 4 5GC ...
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