5G Deployment Option-4/4a

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Hi Guys today we are learning about 5G deployment options, if you want to know more about other 5G deployment option please click here

 Option 4: NR-EUTRA Dual Connectivity(NE-DC)


Option 4 represents a network using the Next Generation Core (NGC). Control signaling will be routed through the NR RAN.

The only difference between Options 4 and 4a is based on whether the user plane data is sent to LTE directly or via the NR RAN.(Difference is UP path Non Standalone (Dual Connectivity 4G/5G)).



The pre-requisite conditions for Options 4/4A are eLTE(Release 15) upgrade at the start and a robust 5G coverage.

In Option 4/4a, there can be a Dual Connectivity between the gNB (similar role as MeNB in TS 36.300) and the NGC with Non-standalone E-UTRA (similar role as SeNB in TS 36.300). The E-UTRA user plane connection to the NGC can go either via the gNB i.e. Option 4 or directly i.e. Option 4a.




The procedures and protocols for the Xn interface between eLTE eNB and gNB should be newly designed.

This deployment scenario will be especially attractive for deployments of NR access systems in areas where the legacy LTE eNB and the EPC are prepared to be upgraded to ng-eNB and the 5GC, respectively, so that the benefits of these enhanced network elements can be inherited.

In Option 4/4A, the gNB will be connected to the 5GC with NSA evolved E-UTRA, and the ng-eNB will have the NR gNB as an anchor for CP (part of the network carrying signaling traffic) connectivity to 5GC.

The evolved E-UTRA UP connection to the 5GC will go either through the gNB Option 4 or directly Option 4A.




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