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To: Rajala who wrote (16724)10/19/1998 9:55:00 AM
From: Clarksterh  Read Replies (1) of 152472
 
Rajala

Thus the (marginally) higher theoretical capacity of WLL brings very little savings in rural areas as the the capacity is not the bottleneck (distance to base station is).

I agree if it is indeed a rural area in which you are installing the system. However, most customers in developing countries are in what we would call suburban areas (i.e. the outskirts of big cities like Sao Paulo or Bogata), not rural areas, for the very simple reason that even in developing countries there has been a big migration away from farms.

Secondly, the economies of scale are of such great magnitude with GSM system that IMO the cheapest way of designing a WLL system is by using standard components of GSM. Thus no savings nor more spectral efficiency.

I agree that most of the WLL systems are indeed very similar to full mobile systems. However, some of the spectral efficiency comes for free. For instance the near-far problem becomes much smaller in WLL CDMAOne with no change in the BS or remote. And other changes come for only a very small one-time development cost for software - such as the real-time reallocation of frequencies and time-slots in TDMA systems. I do not know which of the particular changes they have implemented, but I would be surprised if they hadn't made at least some.

Also we should not count the base stations on the highway as extra cost, as the mobile system can be built just as patchy as the WLL system. In India this appears to be the norm.

I agree but now you are no longer comparing apples to apples. You could also just underinstall a WLL system and save some money there.

Clark
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