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5G in every corner

South Korean telecommunications company SK Telesys is bringing the 5G mobile network to every corner of large buildings with its remote radio units (RRUs). Three axial compact fans with extra power provide cooling for the RRUs.


The new 5G wireless standard promises a rosy future – and not only as a key technology for faster machine-to-machine communication in the IoT environment: Tens of thousands of people will be able to surf the net on mobile devices at trade shows or in soccer stadiums without any problems – all at the same time and at ten times the speed offered by its predecessor, 4G. For this to work, large buildings such as shopping malls and stadiums need what are known as ‘RRUs’, which pick up the signal from the large 5G antennas and transmit it into the building. This is because 5G has one disadvantage: it uses a shorter-wavelength frequency for its high data transmission rates. This has a shorter range and is often absorbed by the walls of buildings, resulting in annoying dead spots inside.

The RRUs from South Korean telecommunications company SK Telesys is bringing 5G to all corners of a building.

If SK Telesys has its way, however, these dead spots will be a thing of the past. With its RRUs, the telecommunications company from South Korea’s capital Seoul is bringing 5G to even the remotest corners of buildings – without any loss of speed and for use by many people at the same time. The RRUs can be installed both inside the building and outside, for example on the roof. This is particularly advantageous in warmer regions around the world, as the RRUs also generate a lot of heat with all the 5G data traffic, which can be dissipated better outside.

“We have increased the speed of our axial compact fans from 8,500 to 9,900 rpm especially for this application.”Bernhard Thürmer, Area Sales Manager at ebm-papst

Full coverage thanks to cool solution

To ensure that SK Telesys’ RRUs do not overheat and do not cause power failures in the buildings, the company relies on a custom-fit, high-performance cooling solution from ebm-papst. A total of three axial compact fans are used for this. Bernhard Thürmer, Area Sales Manager at ebm-papst, explains: “SK Telesys’ remote radio units require a lot of cooling capacity. This is why we have increased the speed of our axial compact fans from 8,500 to 9,900 rpm especially for this application.” In addition, the fans have very low electromagnetic radiation so as not to interfere with the 5G signal. “Our development engineers designed a new circuit board with shielding components in X months”, adds Thürmer.

With a full encapsulation of fan PCB, stator and winding the axial fans also run reliably outdoors and in all weathers.

Flexible network in any environment

SK Telesys has also equipped its RRUs with weatherproof components for outdoor use. Accordingly, the axial compact fans are also protected from dust, splash water and salt spray thanks to a fully cast circuit board and stator, and are fully functional at temperatures from -40 to +60 degrees Celsius. So even in tropical areas or right by the sea, the RRUs provide a reliable 5G connection inside buildings – for the best network, anywhere in the world.

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Compact fans

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