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Technology Stocks : Qualcomm Incorporated (QCOM)
QCOM 174.01-0.3%Nov 14 9:30 AM EST
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To: Joe NYC who wrote (20730)1/4/1999 12:21:00 AM
From: Clarksterh  Read Replies (1) of 152472
 
Joe - This 1.25 MHz channel, by that do you mean 1.25 MHz for sending and another 1.25 for receiving, or half of 1.25 MHz each way?

Each way. The reason is that if they were talking on the same channel the signal your transmitter was sending would completely swamp the receiver. Thus they are separated by many MHz (45? off the top of my head).

Clark

PS The reason for using one channel in the initial deployment is, in retrospect, obvious. When a provider is first deploying and does not yet have a single customer, they want to minimize their expenditures. In order to do this they must:

1) Maximize the distance between basestations

2) Minimize the cost of each individual basestation (i.e. One channel and no sectors.)

As customers join the provider will have to add capacity in certain areas, and there are several ways to do this:

a) Add new sectors in the overloaded basestations (has little ripple effect on other cells). Only a little bit of new equipment is needed for each of the overloaded basestations, and no new site.

b)Add some new cells. Need whole new basestations and new sites, and thus this is more expensive than #a.

c) Add a new channel. But now, to get the benefits of softhandoff (a selling feature) you need to add the second channel to all sites in the area (very expensive). Even if you decide to forgo(sp?) the selling feature of softhandoff, and only add the extra channel to the overloaded sites, it doesn't cost any less than #a. Therefore option #a is the preference until it isn't possible anymore.

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