What is NOKIA RRU and Why Do We Use Them?

A Remote Radio Unit (RRU), also known as a Remote Radio Head (RRH) is a transceiver deployed on base stations. A transceiver combines the functionality of both a transmitter and receiver in one unit. Due to its features, RRU is used as a transceiver in telecommunications.

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An RRU is a device that connects wireless devices with wireless networks to ensure the transmission and reception of data, including text messages, and various other forms of communication. In other words, it establishes a connection between an operator network with mobile devices, cell phones, or other users’ equipment (UE).

Additionally, the RRU unit establishes a connection to the base station through a bidirectional fiber optic link. A common public radio interface (CPRI) is this optical interface link. CPRI is an interface protocol developed by telecommunications equipment manufacturers, including Huawei, Cisco, Nokia, and many more.

Note that the RRU helps to reduce losses in coaxial feed lines. This helps to improve the efficiency of the system and delivers a significant degree of flexibility in the construction of cellular sites. This makes it easier to upgrade to new equipment and devices.

1. Facilitates the transmission and reception of user signals to and from the base station.
2. Offers seamless support and connectivity for user equipment, including functions such as power management and signal delay.
3. Controls and processes electromagnetic signals received from the through via a hollow guide known as a Jumper.
4. Serves as an interface between two different physical links, such as optical and electromagnetic connections.
5. Manages and controls auxiliary equipment, such as the Remote-Control Unit (RCU), for tasks like remote electrical tilt adjustment (commonly referred to as RET).
6. Generates and transmits various signals, including but not limited to VSWR, RET, and ACT, among others.

What is RRU in Telecom?

A Remote Radio Unit (RRU), commonly referred to as a Remote Radio Head (RRH), is a transceiver that you’ll find on wireless base stations. These transceivers connect wireless devices with wireless networks, making it possible to send and receive text messages, among other things.

RRUs are one of two primary units of a wireless base station. The RRU is the RF processing unit; it transmits and receives signals. You’ll typically find the RRU at the top of a base station, mounted near the antenna. RRUs can receive, transmit, filter and amplify RF signals.

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The graphic below from Tech Target illustrates where RRUs fit in wireless communications. Every time you send a text, your sends a digital signal to a nearby cell tower, or base station. When that cell tower receives the signal, the RRU is responsible for converting it into an RF signal and transmitting it to the cell tower’s BBU. Optical fiber connects the RRU to the BBU. The BBU is then able to send the signal to a cell tower near the person you texted.

As you can see, there’s a lot going on behind the scenes of every text message you send and receive! And this is just the tip of the iceberg.

Function of RRU in Telecommunications

The primary functions of an RRU include:

Signal Transmission and Reception: The RRU receives and transmits RF signals between the antenna and the Base Band Unit (BBU).
Signal Processing: It processes RF signals, including filtering and amplification, to ensure clear and reliable communication.
Interface Between Optical and Electromagnetic Links: The RRU interfaces between the optical fiber link from the BBU and the electromagnetic link to the antenna using various ports.
Connectivity: It provides the necessary connectivity between user equipment (like cell phones) and the operator's network.
Types of RRU in Telecommunications

1.RRU: Definition and Overview

1. RRU stands for Radio Remote Unit and is the distributed frequency unit that connects to an operator's network and user equipment like cell phones. It is installed below antennas on towers. 2. RRU functions include transmitting and receiving signals, providing connectivity between user equipment, and interfacing between optical and electromagnetic links using ports. 3. BBU or Base Band Unit is the "heart" of communication and processes signals between analog and digital formats. It works with RRUs to form BTS and communicates with RRUs via CPRI fiber cable.

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