The inadequacy of in-building mobile coverage is a constant refrain, especially among medium and large enterprises, but progress in addressing the problem has been slow. Distributed antenna systems (DAS) are mainly suited to very large locations such as sports venues, while WiFi is widely installed but has some challenges in terms of mobile hand-off, voice quality and security, especially for organizations which cannot invest in highly customized, enterprise-grade WLANs. Small cells, integrated with WiFi and the corporate LAN, are a strong solution, but MNOs have generally found it hard to make a good business case, while the potential customers are unwilling to invest in something they believe should be delivered as standard by an operator. The way forward lies with…