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To: Rajala who wrote (15493)9/25/1998 9:37:00 AM
From: Clarksterh  Read Replies (1) of 152472
 
Rajala - From the mobile point of view it is pretty much as expensive to build a patchy coverage mobile network than a WLL network.

I agree that, due to fact that most WLL systems are mobile-lite systems, the cost difference between the equipment for a WLL system and a mobile system isn't all that much. However, there are several other factors:

1) The link budgets for a WLL system are much more robust. The current generation of WLL doesn't, to my knowledge, take much advantage of that, but they undoubtedly will at some time. When they do it will be possible to get considerably more users per BS than on a mobile. (much the same reasoning as the 3g spec says that a fixed user should be able to transmit 2 Mbps, while the full mobile can only transmit ~300 kbps).

2) Installation/operation. The installation and tuning costs for a mobile system are substantially more than for a WLL system. This is related to the first item, and in fact as the WLL systems start taking full advantage of the immobility of their users, this difference will largely disappear - although some of it will remain such as the lack of the need to hook up all the roaming stuff.

3) Legislation. As I noted in an earlier post, many of the developing countries have over-legislated telecom industries. I know of several countries where the fixed and mobile operators each have a government given monopoly. The fixed provider cannot install a mobile system, but they can install a WLL system.

Clark

PS If I had to guess I would say that the cost/user for WLL is probably 1/2 that of full mobile for the same city. This is after accounting for the fewer number of basestations needed, the easier installation and the more heavily loadable system.
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