To do the 5G transformation of 4G base stations, LTE anchor base stations and NR base stations are required to share the BBU frame, so which of the following practices is feasible?

• A.LBBPc is replaced with UBBPg veneer
• B.Use the BBU3910 as the chassis for 4G and NR
• C.Use UMPTb as the main control board for 4G and NR
• D.Replace BBU3900 with BBU5900

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The order in which the gNodeB adds hardware devices is Cabinet->Chassis->Board->Radio Unit.

• A.True
• B.False

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What are the following layer two protocol of the 15.5G air interface control plane? (Multiple Choice)

• A.RLC
• B.SDAP
• C.MAC
• D.PDCP

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