The Femto Forum has managed to bag some network operators and infrastructure providers, adding 40 companies to its roster and looking a lot less like a club for femtocell manufacturers. The forum was launched back in July, but was almost entirely made up of those making femtocells who have something of a vested interest. The …
Don't let femto fall to the marketing scum!
For the record - one femtometer is roughly half the width of a proton. Femto is a prefix meaning 10^-15. Therefore, a femtocell would have to cover one 10^-15th the width of a regular cell. GSM can reach (optimistically) 50 km from the base station, so we have (5m*10^4) * (10^-15) = 5m*10^-11 = The width of the inner electron cloud of a carbon atom. I can't imagine a cell zone of this region being useful, but I certainly give props to the engineers who can design something this small! Please call them, say, millicells or something more accurate - and stop peeving my pet.
But a cell occupies volume in three-dimensional space, so maybe a better calculation takes the volume of a femtocell as 1x10^-15 the volume of a full-size cell.
That would put the linear dimensions of the femtocell at 1x10^-5 that of a cell, so if a cell is 5x10^4 m then a femtocell is 5x10^-1 m - or half a metre. I think this is a bit smaller than what they have in mind, but it's not so wildly inaccurate...
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