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What is 5G Fronthaul,Middlehaul,Backhaul

What is 5G Fronthaul,Middlehaul,Backhaul?
5G network has three parts, Access Network, Bearer Network, and Core
Network. The access network is also Radio Access Network(RAN), which
is mainly composed of base stations.
Mobile communication architecture
So what does the base station include? The base station usually includes
BBU (mainly responsible for signal modulation), RRU (mainly responsible
for radio frequency processing), feeder (connecting RRU and antenna)
and antenna (mainly responsible for the conversion between the guided
wave on the cable and space wave in the air.
Each base station in 4G network has a BBU, which is directly connected to
the core network. In 5G networks, the access network is no longer
composed of BBU, RRU and antenna. Iit is reconstructed into the
following three functional entities: CU (centralized unit), DU (distributed
unit) and AAU (active antenna unit). The original 4G RRU and antenna are
combined into AAU, and BBU is divided into CU and DU. DU sank to AAU.
One CU can be connected to multiple DUs.
The 4G network has fronthaul and backhaul. But in the 5G network, it is
divided into three parts. The AAU connected to the DU is called 5G
Fronthaul. A part of the DU connected to the CU is Middlehaul, and the
backhaul is the communication carrier between the CU and the core
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