AT&T has been pushing the idea that a version of LTE Advanced, using a lot of carrier aggregation should be called 5G Evolution and said this week it has installed it in parts of Indianapolis, more than doubling data speeds there. While there are arguments about nomenclature, it shows very clearly its step by step, pigeon steps towards a faster network – it will put 5G Evolution into 20 metro areas in 2017. It has already launched it in Austin, Texas, and will add Atlanta, Boston, Chicago, Los Angeles, Nashville and San Francisco. In each case this is mostly about carrier aggregation, using 3 separate extra carriers – oddments of spectrum that can be used for the download path. The…