Cingular bumping

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Miles - 03 Jul 2005 14:58 GMT

here's a quick conversation which may be of interest. By the way,
Pauline, are you using GSM with Cingular?
Miles
------------------------------------------
Incidentally, it works fine with BT, but that is Nokia-- voice dialing
via BT is a great advent for me. A few people have told me that during
peak hours they cannot make connection -- Cingular is becoming too
popular for their current abilities. One lady told me that in talking
with Cingular in San Francisco that if someone is closer to the tower
than you, you can me thrown off, and they get on!

Miles
-----------------------------------------

I don't think so. It's pretty much whoever is using the channel first
keeps it with GSM. Your call could drop if your call tries to move to
a tower that is busy but the only way you can get bumped is with that
newly implemented law enforcement priority I believe.

It may work differently with CDMA.
-----------------------------------------

I think I have heard that CDMA suffers from the"shrinking cell effect",
which means when a tower reaches capacity, the people closest to the
tower are the ones the system keeps on. It would explain while I was in
Chicago 2 years ago why the Verizon phone I used would sometimes have
"full" signal in one place, and minutes later have no signal at all
(Verizon was terribly overloaded when I was there.)

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Steven de Mena - 07 Jul 2005 07:12 GMT

"I think I have heard..."

"I don't think so..."

"A few people have told me...."

A totally f.cking worthless post.

> here's a quick conversation which may be of interest. By the way,
> Pauline, are you using GSM with Cingular?
[quoted text clipped - 24 lines]
> signal in one place, and minutes later have no signal at all (Verizon was
> terribly overloaded when I was there.)

Reply to this Message

Miles - 07 Jul 2005 20:46 GMT

With your illiterate language you certainly add a great deal to this
newsgroup!
Miles

> "I think I have heard..."
>
[quoted text clipped - 32 lines]
>>signal in one place, and minutes later have no signal at all (Verizon was
>>terribly overloaded when I was there.)

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John Bartley K7AAY telcom admin, Portland OR - 07 Jul 2005 18:57 GMT

>here's a quick conversation

With whom?
And,what are their credentials?

>which may be of interest. By the way,
>Pauline, are you using GSM with Cingular?
[quoted text clipped - 14 lines]
>a tower that is busy but the only way you can get bumped is with that
>newly implemented law enforcement priority I believe.

Or, equivalent systems.

>It may work differently with CDMA.
>-----------------------------------------
[quoted text clipped - 5 lines]
>"full" signal in one place, and minutes later have no signal at all
>(Verizon was terribly overloaded when I was there.)

Betrays total ignorance of the foundations of CDMA technology.

With CDMA, it's the S/N ratio, not proximity.

--
John Bartley K7AAY USBC/DO PDX OR USA
"This is a carburetor," Hank tells his son. "Take it apart, put it back together; repeat until you're normal." - KOTH

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Miles - 07 Jul 2005 20:47 GMT

>>here's a quick conversation
>
[quoted text clipped - 39 lines]
> John Bartley K7AAY USBC/DO PDX OR USA
> "This is a carburetor," Hank tells his son. "Take it apart, put it back together; repeat until you're normal." - KOTH

This msg was sent in error to the newsgroup and it was cancelled, but
evidently Mozilla that only cancels it from my view, not from the NG.
Miles

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nospam@ptd.net - 08 Jul 2005 15:07 GMT

>>I think I have heard that CDMA suffers from the"shrinking cell effect",
>>which means when a tower reaches capacity, the people closest to the
[quoted text clipped - 6 lines]
>
>With CDMA, it's the S/N ratio, not proximity.

And since the people farthest from the tower are likely to have a
lower S/N ratio they will probably get bumped first.

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Isaiah Beard - 12 Jul 2005 21:40 GMT

>>-----------------------------------------
>>
[quoted text clipped - 6 lines]
>
> Betrays total ignorance of the foundations of CDMA technology.

Yes, you have. :)

> With CDMA, it's the S/N ratio, not proximity.

Actually, it's both. In CDMA, ec/Io will still increase with distance.
That's simple RF theory; the further away you are from the RF source,
the wekaer the received signal. In CDMA, this translates to a higher
noise floor at the fringes of the cell site.

Consequently, as a site's load increases, the noise floor increases for
everyone, but moreso for those users farthest away from the cell site.
So yes, the furthest cell users would get likely get have their calls
drop first. And the term is cell "breathing," not cell shrinkage.
Close enough though.

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