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Sprint Ranging Data

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hcso1510
(@hcso1510)
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In a recent case involving a Sprint cellular account I asked for and received some reveal records that contained PCMD ranging data. The two “Call Types” that were associated with this data were EVDO and Data 1X transmissions. From speaking with Sprint my understanding is a data transfer signified by EVDO is quicker than Data 1X. I was also told that EVDO data transmissions were internet based.

The ranging data associated with Data 1X transmissions seems to be quite consistent at 3.6 miles from the antenna, but the EVDO ranging data seems to be excessive and all over the place from 20.0 , 90.0, 110 miles, etc.

I have several questions and was wondering if anyone might have some answers.

Do data transfers in EVDO and Data 1X format both transfer in the same frequency range?

If I were sitting at my house and wanted to send an active Sprint account a Data 1X transmission could that be accomplished by a standard SMS originating from my handset? Are there other ways to do this?

If I wanted to send an EVDO data transmission is the only way to accomplish this by sending a data transmission via the internet?

Would the data transmission type change depending on whether an SMS was sent from a handset or via the internet?

Thanks!


   
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Passmark
(@passmark)
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Joined: 14 years ago
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Was this in a built up / populated area?
If so it would be very very unusual to have 100 mile cell sizes. In most cases a mobile phone doesn't have the power to transmit more than 30 miles back to the tower. Although it can be better over flat water.

Most cells are only a few miles wide. In very built up areas a cell might only be 1/2 mile in size or less (Microcells).

Be interesting to know how this PCMD data was calculated. But it is highly likely it is wrong (or the decimal place is in the wrong spot).

DATA 1X is most likely a normal voice channel that was used by the network for data. At least in the case of GSM mobile networks SMS messages are carried on a separate lower bandwidth channel. It doesn't make sense to allocate a full data channel for small SMS messages.

In terms of frequency, each carrier has a range of frequencies they are allowed to use by the FCC (ACMA in Australia). So all data transmissions will fall within the same range.

There is a great chart here for the USA,
http//www.ntia.doc.gov/files/ntia/publications/2003-allochrt.pdf

And one here for Australia (I am in Australia),
http//www.acma.gov.au/webwr/radcomm/frequency_planning/spectrum_plan/arsp-wc.pdf

Normally you don't have a great deal of control over the protocols, frequencies and modulation used for you mobile's data connection. The mobile and the base station negotiate a suitable, compatible, set of parameters for your call when it is setup.


   
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