<<<<If you get bored, please analyze the effects of subscriber priced calls. Calls are
going to have to be rationed somehow, and accurately, to avoid wasted resources
or frustrated customers with "NO SERVICE" flashing. Then get Globalstar and
Qualcomm mangement to do something about it. >>>>
I had been reading this for a few days and I admit, I still didn't get it. I think what your talking about wiht the spectrum filling up won't happen for a long time. If there are people to talk and people to use it and pay for it, the sprints and Primecos of the world will build out infrastructure to use it. They have alot of unused spectrum up there in PCS space.
If you look at Japan and PHS, you see that they put these little cordless phone boxes on almost every building and they reuse the spectrum quite alot. Too bad the service is just that, cordless phone. You can call out, but can't get a call.
CDMA offers the same advantage, in that there are 4096 possible CDMA codes and you only need to offset them by the maximum cell radius in time, or about every 128 per todays network. If you shrink into microcells, then this timing difference becomes like 64 or even 32, giving way to 100-200 possible adjacent cell codes. It means in technical terms you can stack cells along side each other very well and the "Breathing" thing that was discussed before comes into play. Just put in another cell and the others adjust down in size automatically to let the new one in. Each cell is unique to the other by the code difference. Part of the system design.
I do not think that we will get to the point where the frequency will be rationed, but that the carriers will have to buy ever smaller cell site equipment. There are also ways to take a single RF station and remote antennas for it to make it appear like a new cell. Nobody has started doing this yet, since they only need to pick off the top 20% of the technology today to make a good business out of it. In the future as Sprint and others mature in coverage, they will also take more advantage of all these other features.
By the way, for indoor PBX, CDMA could be used the same way. Here you take a single antenna string and at each 100-200 feet you delay the signal by the code difference (20-50 milliseconds), and the phone thinks it is a new basestation and hands off to it. So you can have completely unique handoffs down a hallway to the same RF carrier.
(Wasn't really bored, just got all hyped up by the exchange between Maruice and Ramsey and Dougjn...) |
