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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Image: RRU
Definition of Radio Remote Unit (RRU)
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).
The RRU is typically located close to the antenna, commonly on top of the base station. RRUs can amplify, filter, and receive and transmit RF signals.
Image: RRU on a tower
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.
Functions of RRU
The RRU in a BTS performs some key functions which may include the following:
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Most modern wireless networks utilise a distributed base station architecture that physically separates the Remote Radio Unit (RRU) and Base Band Unit (BBU). The hybrid cable incorporates both optical fibre and power into the same cable design, minimising operational and installation costs while providing a secure way of quickly installing and upgrading the wireless network.
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This terminal box, with MPO connectors is installed at a Remote Radio Unit (RRU) site and can feed 6 x RRU. The box is an externally mounted enclosure, allowing for an optical connection between the mobiles base station and 6x RRU.
' Plug and play
' IP66 weather-proof, UV resistant, enclosure
' Weather-proof cable gland entries
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' Features high density MPO connectors
' Pole mountable using standard 'band-it' straps, on stainless steel mounting brackets
' Wall mountable
' Meets all mobiles optical and physical performance criteria
This 1 ¼' (Ø38.5mm) hybrid trunk cable on drum is pre-terminated as a part of the 6 RRU hybrid junction box. The 6 pair DC power connector is terminated in staggered lengths with cable lugs for quick and easy installation to the 6 RRU hybrid junction box. This pre-terminated solution is specifically designed for connecting up to 6 RRUs and provides a fast and effective means of adding extright angle wireless sectors at mobile base stations.
' 2 x 12 fibre MPO Optical connections
' 12 x DC copper cables (10mm²)
' Pre-terminated copper cables with lugs for quick and easy installation to Mobile junction box
' Custom trunk cable lengths to suit every site
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The Hybrid Jumper Cables are used to connect VAC Hybrid Junction Boxes and the RRHs/RRUs at the mobile radio sites.
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