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What is the difference between RRU and RRH?

A Remote Radio Head (RRH), also known as a Remote Radio Unit (RRU), is a small outdoor transceiver used with a wireless base station. They connect wireless devices with cellular wireless networks. They are used to extend coverage into rural areas, improve urban service, and address dead zones found in tunnels and similar blind spots of existing cellular coverage.



Nokia 8 pin RRH Alarm Cable



Remote radio heads are usually mounted close to the antenna to reduce transmission line losses. It connects to the baseband unit (BBU) over fiber optics using Common Public Radio Interface (CPRI) or Open Base Station Architecture Initiative (OBSAI) protocols. The BBU provides the interface to and from the cellular network.



A remote radio head transceiver has two main parts: transmit and receive. The transmit section consists of a digital-to-analog converter (DAC), mixer, RF power amplifier, filter and duplexer. It obtains the data signal provided by the BBU through the optical fiber, converts it into an analog signal, up-converts it to the required radio frequency, and sends it out through the antenna after amplification.



The receive section consists of filters, low-noise amplifiers (LNAs), mixers, and analog-to-digital converters. It receives the signal from the antenna through a duplexer, filters and amplifies it, converts it to a digital signal, and sends it to the BBU and into the cellular network through optical fiber.



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