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AT&T Wireless AT&T designs low power system for National Radio Quiet Zone

Discussion in 'Wireless News' started by JFB, Mar 24, 2016.

  1. JFB

    JFB Gold Senior Member
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    palandri likes this.
  2. KevinJames

    KevinJames WA's 1st retired mod
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    Good for them. I was just reading a rant the other day, I forget if it was here or elsewhere, that AT&T was technically inept. I knew that wasn't true, but of late, they really haven't developed anything noteworthy. (All the consumer product add-ons they sell were actually developed by other companies.) So it is good to see they still have some tricks up their sleeve.
     
  3. palandri

    palandri Former Palm Guy
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    I would think the system they installed is the same low power cell signal booster they install in malls and high rise buildings throughout Chicago and the suburbs. They are the only carrier that I have seen install it.
     
  4. viewfly

    viewfly Mobile RF Advisor
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    Interesting. As the article says it requires many short range antennas (40 foot range) linked together to force each smartphone to emit its lowest transmitted power.

    Nearly 200 of them.


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  5. RadioRaiders

    RadioRaiders RF Black-Belt
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    From my understanding, ATT is forcing the UE (User Equipment, or the phone) to reduce it's transmit power from the network side in order to keep the uplink and downlink power balanced. There's nothing special about a low powered DAS system, they are all over the place in shopping malls, office buildings, etc. However in those cases, when the DAS transmission gets too weak, the UE will increase it's power and find a macro cell (ie: a more powerful roof-top antenna).

    In this special case with the telescope, the trick was to stop the UE from doing that (increasing it's TX power) and to force it to stay locked onto the DAS so the UE never transmits a higher power that could interfere with the telescope. By keeping the DAS antenna distance shorter than usual and forcing the power of the UE to stay low, these two things combined, seems to be the "special solution" they came up with here.

    Strange, they didn't mention what technology it's for, as GSM, UMTS and LTE all behave differently (especially UMTS), and all have different types of power control.



     
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