Communication base station amplifier/professional basement signal enhancement project

Brand: GLINK

Low frequency band: 806-960

Mid-band: 1710-1880

High frequency band: 1920-2650

The number of antennas that can be carried: 5G

Manufacturer model approval certificate: SRF-L900-43N/F

Network format: 4G+5G

When we surf the Internet through the wireless network, the signal sent by the mobile phone needs to pass through the base station, the bearer network, and reach the core network.

So, how much bandwidth is needed from the base station serving multiple users to the core network? This involves the estimation of the backhaul bandwidth.

In fact, the original backhaul bandwidth algorithm does not distinguish between 4G and 5G, but considering that the 5G architecture also includes fronthaul and midhaul, the first part will give a general introduction.

1. What is backhaul?

Speaking of the 5G network architecture, the most widely spread is the standard structure of AAU, DU, CU plus core network in the figure below.

AAU: Active Antenna Unit, active antenna unit, is a combination of RRU and antenna;

DU: Distributed Unit, distributed unit, the original 4G BBU splits out the part that needs real-time processing, and is generally deployed at the site together with AAU;

CU: Centralized Unit, a centralized unit. The original 4G BBU splits out the non-real-time processing part. It is generally believed that it should be deployed in a centralized manner and can manage multiple DUs;

Although the architecture is so, in the actual 5G network deployment, there is no strong motivation to split the network elements for the time being, and the DU and CU are basically deployed in one. In this case, DU plus CU is still called BBU.

Since the CU and DU are integrated and deployed as a BBU, the transmission between them becomes an internal interface. Therefore, what everyone is most concerned about is the transmission between the BBU and the core network: backhaul.


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