Re: MI automatically locating a caller on cellular networks

[Ian_Rudd]

Try


 http://www.cursor-system.com/


Ian

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Re: MI automatically locating a caller on cellular networks

[John Watson]

Rajeev,

Check out www.Cell-loc.comfor information on 
locating cellular users without a GPS.

John Watson
Advanced Information Marketing

  - Original Message - 
  From: 
  Rajeev saraf 
  
  To: mapinfo-l 
  Sent: Wednesday, March 22, 2000 9:15 
  PM
  Subject: MI automatically locating a 
  caller on cellular networks
  
  Hi mappers:
  This quewtion is not related much to MI but 
  more tp cellular telephony. Is it possible to identify the location of a 
  cellular celluar ( within say 20 to 25 metre accuracy) without the caller 
  having having a GPS or similar device. Or oes the cellular switching has any 
  information using which we can track a caller? Any pointers would be 
  appreciated. I wam sure people in RF planning may have some answer to 
  it.
  --
  rajeev saraf

Re: MI automatically locating a caller on cellular networks

[john-mccarthy]

Yes for both questions.. somewhat
I do not believe accuracy to 25 meters can be claimed, 
even though someone trying to sell you something will 
tell you anything you want to hear. There are 3 and 
perhaps 4 ways of identifying location, the problem is 
that equipment needs to be located at the cellsite for 
the carrier. Equipment vendors use such techniques as 
the timing difference between when each cellsite sees 
the signal, timing difference between antennas located 
at the same cellsite, the strength of the signal 
transmitted by the phone, timing infomation located in 
the bit stream in some wireless technologies like TDMA 
(time division multiple access) and CDMA, and I've heard 
something on the timing in CDMA (code division multiple 
access) and using the reference gps from the cellsite, 
all cellsites in CDMA systems use gps timing to time all 
users on the cellsite (Sprint, Primeco...). Cellular 
carriers also can pinpoint a phone to a single antenna 
beam on a single cellsite from reports in the network 
switching office.  Research the subject  'time of 
arrival' and see what you come up with. Wireless phones 
at the end of the year will have gps installed in them 
by some of the manufacturers, if they hit the market, 
Big Brother is watching, will again have a new twist.

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Re: MI automatically locating a caller on cellular networks

[Rajeev saraf]

I remember reading somewhere that some company in UK that 
developed aan algorithm or software to locate a caller within 20 to 25 meters. I 
am sure cell companies like nokia, ericssion, motorola, etc. may have some 
solution if everybody is talking of location based WAP services.

--
rajeev saraf

-Original Message-From: 
Trey Pattillo [EMAIL PROTECTED]To: Rajeev saraf 
[EMAIL PROTECTED]Date: 
Friday, March 24, 2000 7:01 AMSubject: Re: MI automatically 
locating a caller on cellular networks
Hello,

Beside what I do here on the list from 8-5 I'm 
the Operations and GIS manager for the Coastal Bend 9-1-1 
network.
12 counties, 22 answering points, 15000 sq mi, 
1400 miles off *highway* [no cities etc] with Corpus Christi, TX being the 
*major* city 300,000 pop.
AND A F-A-S-T GROWING CELL PROBLEM FOR 
9-1-1

We are just now upgrading toPhase 1 
Wireless as mandates by the US FCC by 31 Oct 2000 which will now give us the 
[911 call taker] the cell phone number, name, and *registered* address, this 
will be a 10digit ph# to take care of area codes for traveling 
phones.

The best location we will get is the cell 
company ID,cell tower ID, and Sector [face] which I will put into MI as 
provided by the estimated 600 towers that exist[no one really knows 
how many there are = 26 sellers of phones in this area].

Phase II mandates the 30 Oct 2002 we will get 
location within 100meters 67% of the time. HA-HA
Feds are looking to change this date or 
requirements as it has not been successful yet.
Time-Difference-Of-Arrival which triangulates 
position works really good here in the hinterland but sucks in the urban 
canyon. GPS is capable of being put into the phone but everyone likes 
their $19.95 and not having to up that to $
like the Motorola Iridium.

For now if I can say that you need to send help 
in the NW area of this location [the tower] - but some of these towers are 
35mile omni-directional - it is better that saying *well, we go a cell 
call*..

Trey Pattillo[EMAIL PROTECTED]http://www.wap3.com

- Original Message - 
From: 
Rajeev 
saraf 
To: mapinfo-l 

Sent: Wednesday, 22 March, 2000 
22:15
Subject: MI automatically locating 
a caller on cellular networks

Hi mappers:
This quewtion is not related much to MI 
but more tp cellular telephony. Is it possible to identify the location 
of a cellular celluar ( within say 20 to 25 metre accuracy) without the 
caller having having a GPS or similar device. Or oes the cellular 
switching has any information using which we can track a caller? Any 
pointers would be appreciated. I wam sure people in RF planning may have 
some answer to it.
--
rajeev 
saraf

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