well i can assure you that very few ops had 3G ready BTS's. actually except reliance (claimed by them)none had 3G ready BTS's.
That's the reason for the (well cant say it but) delayed roll out of 3G. there are still many important towns were there is no trace of 3G, what will u say abt that.
3G has been being activated since not long after the auction ended, which suggests that there was equipment already out there, but in small towns, it's pretty understandable - quite often networking gear is recycled again and again until it either craps out or reaches the end of it's useful life, so as the urban areas get new equipment, the old equipment gets moved out to more rural areas.
If, however, there is equipment in the field that hasn't had 3G "switched on", then it may be a planning or network capacity issue depending on how the provider has the backhaul provisioned - they still have to buy fibre to connect those base stations up (or do it with wireless which is just ugly) and as such, may even be a cost/return on investment issue in some places.
One of my friend's
brother works in
Nokia(NSN perhaps) and he said that they had got contract to change all BTS to 3g ready ones in bihar's some district. He said that they had to change some modular cards for that and all that stuff.
Out of the tens of thousands of BTSes all over India, how many of them were 3G enabled was "significant" as far as population is concerned but actual geographical coverage, not so much. I can't imagine there being particularly great coverage in Bihar (which is rather unfortunate by itself), but this is kind of what I said, isn't it? Not just a software update, additional hardware needed.
To add all HSPA plus systems can easily migrate to LTE due to this modular design approach implemented currently...if i am not wrong.
I'm not sure that HSPA can migrate to LTE without upgrading the base station hardware, otherwise the equipment manufacturers are really pulling the wool over our eyes. Whether it's as simple as inserting another module in to existing hardware to have LTE and HSXX operating from the same base station would depend on the manufacturer.