Centralized RAN and Fronthaul

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A Centralized Radio Access Network (C-RAN) is an architecture where the Digital Units (or Baseband Units) are placed at a centralized location, and the Remote Radio Units (RRU’s) are placed at distances up to several kilometers away from the baseband site. The connection from a baseband unit to a remote radio unit is typically a fiber facility which is referred to as “fronthaul” to differentiate it from backhaul which connects the baseband unit to the network. This document will discuss the background and origin of the C-RAN architecture and the cost savings that can be achieved using this approach.

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