In 5 G wireless network architecture

the 3 GPP has reconstructed the base station that divided BBU into two functional entities those are CU and DU. When we deploy the 5 G RAN

we can put the CU/DU in a same physical equipment or in two different physical equipments. The different ways that CU/DU was placed will get different coast

latency. We have analysed and compared the demands of the network building

maintenance

application scenarios

and technology evolution. Then we make the strategy of building CU/DU in recent and future.