5G is the next - fifth- generation of mobile internet connectivity promising much faster data download and upload speeds, wider coverage and more stable connections. It's all about making better use of the radio spectrum and enabling far more devices to access the mobile internet at the same time. There are a number of new technologies likely to be applied - but standards haven't been hammered out yet for all 5G protocols. Higher-frequency bands - 3.5GHz (GigaHerz) to 26GHz and beyond - have a lot of capacity but their lower wavelengths mean their range is lower - they're more easily blocked by physical objects.
The world is going mobile and we're consuming more data every year, particularly as the popularity of video and music streaming increases. Existing spectrum bands are becoming congested, leading to breakdowns in service, particularly when lots of people in the same area are trying to access online mobile services at the same time. 5G is much better at handling thousands of devices simultaneously, from mobiles to equipment sensors, video cameras to smart street lights.
Most countries are unlikely to launch 5G services before 2020, but South Korea is aiming to get in there first and launch next year, with its three largest network operators agreeing to kick off at the same time. China is also racing to launch services in 2019. Read more on this on BBC.
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