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Technology Stocks : Qualcomm Incorporated (QCOM) -- Ignore unavailable to you. Want to Upgrade?


To: w molloy who wrote (19053)12/2/1998 9:36:00 PM
From: Bux  Read Replies (2) | Respond to of 152472
 
I think the problem with the Sony phones is in the programming of the chip(s). Wouldn't this programming be done by the cellular provider? If so, no big deal. In any case it is only an expensive mistake once the phones are sold.



To: w molloy who wrote (19053)12/2/1998 11:29:00 PM
From: Maurice Winn  Read Replies (1) | Respond to of 152472
 
"CDMA networks closely monitor and regulate handset transmission power. The network has the option of shutting down rogue handsets that
don't comply."

'Babe' stations do control handset power, but I don't think they set a maximum power - they just balance the power within a cell so a distant handset is told to turn the power up more than one 5 metres from Babe. For example, you could have a super powerful handset 300 km from an Australian outback Babe, up on Ayers Rock so you have line of sight. Babe would just tell it to turn itself up until its power matched the cellsite decibel needs to maintain links. I don't think Babe cares how many watts are coming out of the handset, just how many are being received by Babe.

The limits are set by government spectrum police who don't want spectrum pollution. Also, the company, as JGoren says, doesn't want some handsets having advantage over others so I suppose sets maximum power outputs. As he says [next post], this excess power issue came up once before.

That's the story I'm making up anyway. Engineer?

With Globalstar handsets, there is an extreme example of this. When in terrestrial mode close to Babe, the handset will be whispering like all the other cdmaOne handsets in the cell. But when it switches to Globalstar mode, it will be decibeling its head off, sending a signal 3000 km out into space. In a different band of course so the terrestrial system doesn't hear it. Dual mode, dual band. Actually, I'm not sure how many watts the Globalstar handsets put out at peak output. Must be quite a bit since the batteries are big and talk time is small.

Mqurice



To: w molloy who wrote (19053)12/2/1998 11:34:00 PM
From: JGoren  Read Replies (1) | Respond to of 152472
 
The software is usually input into the chips at the factory. The carriers receive firmware updates, which they will put into the phone if you take it back to the Sprint, PrimeCo store. I do recall posting a message back in the summer noting that one Sprint salesman had mentioned that the Samsung phones had the best connection rate on the Sprint system. Someone responded that is because Samsung had the power turned up. PrimeCo is tends to be a far greater stickler than Sprint in wanting its system to run "right" and therefore it would be more likely IMHO to blow the whistle if some manufacturer's phones run at too high a power.



To: w molloy who wrote (19053)12/3/1998 1:37:00 AM
From: freak.monster1  Respond to of 152472
 
sony phone power control issue:

>I understand that the Sony handsets use QCOM chips and
>software. One has to think that QCOM 'phones may also be
>recalled.

So do most all other CDMA phones, and they have not demonstrated
this problem. I do not think this is a QCOM chips or sw issue.
More likely to be RF design (or sw control of it).