It is clear that 5G networks, if they are to support the new use cases envisaged for them, will require far more infrastructure, from small cell sites to high quality fiber backhaul and fronthaul. This is likely to result in a far greater degree of infrastructure, and even active equipment, sharing than operators (and regulators, in many countries) have been comfortable with in the past. As in so many aspects of wireless deployment, South Korea is showing the way. The Ministry of Science and ICT announced recently that the three mobile operators, and one ISP, SK Broadband, would share the cost of building the infrastructure for a 5G network. This would save them about $938m over a decade, according to…