In this scenario, the RRH hardware remains at the cell site. The BBU is relocated to a centralized location to serve multiple RRHs. The optical network links that interconnect multiple RRHs with the centralized BBU are called fronthaul.
Backhaul is better known than fronthaul. It refers to the connections between a mobile network and a wired network that backhaul traffic from disparate cell sites to a mobile switching telephone office
Backhaul links the mobile network to the wired network, while fronthaul describes the network architecture that connects the remote cell sites to the BBU.
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