Re: ATT MicroCell

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#701

From: Mark Crispin
Date: Tue, 25 May 2010 06:38

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AT&T's MicroCell is 3G only (no GSM).  3G, a.k.a. UMTS a.k.a. W-CDMA is a 
CDMA technology.  CDMA technology requires that the cell must know the 
precise time.

GPS provides both the time and the location for operation validation. 
Although it does not "need" to validate location during operation once it 
has done so on power up, it does need to keep its clock synchronized; and 
it does so via GPS.

I do not know about AT&T's MicroCell, but Verizon's network extender has a 
quite sensitive GPS that works with even a limited sky view.  If I recall 
the GPS specification correctly, a fix is needed on just two satellites to 
maintain time.

-- Mark --

http://panda.com/mrc
Democracy is two wolves and a sheep deciding what to eat for lunch.
Liberty is a well-armed sheep contesting the vote.

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Date: Mon, 24 May 2010 23:38:18 -0700
From: Mark Crispin <mrc@panda.com>
Subject: Re: ATT MicroCell
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