Comment some math (Score 1) 124
If we assume that there are about 7 million people in london then that means that each cell serves about 100 people IF they all have 4g cellphones. For some reason this seems a bit off. Lets assume that adoption rates are 50% so that gives us 50 people per cell. 50*100Mb/s = 5Gb/s (assuming all users are mobile otherwise we are looking at 50Gb/s which is quite a load for a single cell but assumes that all the users are pulling the max data all the time). I'm not going to do the math for antenna space and bandwidth, but this [https://www.google.com/url?sa=t&rct=j&q=number%20of%20simultaneous%20connections%20to%20a%20single%20lte%20cell&source=web&cd=3&ved=0CCsQFjAC&url=http%3A%2F%2Fwww.motorola.com%2Fweb%2FBusiness%2FSolutions%2FIndustry%2520Solutions%2FService%2520Providers%2FWireless%2520Operators%2FLTE%2F_Document%2FStatic%2520Files%2F6834_MotDoc_New.pdf&ei=7PeETrGmIo24twemp_gu&usg=AFQjCNEQ5Y_VX896_PG2lJPZK3HviwzdDw&sig2=aDM8ApeoCYBEHMbDCqbDJA] PDF white paper seems to suggest that 200 connections per cell is about maximum. So, I'd say that their math is off somewhere even given reasonable QOS requirements and 50 concurrent users. Maybe they are defining London differently?
TL;DR bad math