Low cost small cells in shared or unlicensed spectrum will have a disruptive effect on the mobile market, lowering the barriers to entry for new operators and allowing non-spectrum holders to deploy LTE indoors and support optimized and localized services. The US cablecos have been talking about this approach since the days of WiMAX, and their standards group, CableLabs, is increasingly contributing to development efforts in 5G, shared spectrum and other relevant technology. Now Comcast looks likely to test small cells in the 3.5 GHz CBRS band, which has a general access, shared layer. Comcast CEO Brian Roberts has previously said that a mixture of WiFi hotspots and homespots, the cableco’s MVNO deal with Verizon, and its own cellular roll-out,…