Does Cingular Use GPS in Phones for E-911?

Archived from groups: alt.cellular.cingular (More info?)

"Henry" <hziembaAT@comcast.net> wrote in message
news:4enk2156qbf69dfpqqf5cfgfqbip3d093a@4ax.com...
> The question is in general. Specifically, the Phila and Baltimore
> markets?
> ------------------------------
>
> Henry
>
> Posted Using Agent 2.0
> [to reply, delete the AT]
>
> ******************************

Not sure, did find this out on the net.


- Cingular chose a network-based solution for implementing E911 Phase II
capabilities, which will work with all handset models, as long as the
handset is being used in an area where E911 has been deployed by
Cingular and the local PSAP. This means that Cingular customers do
not
need to upgrade their phones for Cingular's E911 technology to trace
their location in an emergency.and i found this: AT&T Wireless,
Cingular and T-Mobile are now opting for a more expensive yet less accurate
network-based technology known as time difference of arrival, or TDOA, which
AT&T Wireless and Cingular already are using in their TDMA networks.
Network-based solutions have less accuracy requirements than the
handset-based solutions such as E-OTD and assisted global positioning system
(GPS) solutions U.S. CDMA carriers and Nextel are deploying. Network-based
solutions such as TDOA are required to locate wireless 911 callers within
100 meters for 67 percent of calls and 300 meters for 95 percent of calls.
Handset-based technology requires calls to be located within 50 meters for
67 percent of calls and 150 meters for 95 percent of calls

Archived from groups: alt.cellular.cingular (More info?)

> Not sure, did find this out on the net.
>
>
> - Cingular chose a network-based solution for implementing E911 Phase II
> capabilities, which will work with all handset models, as long as the
> handset is being used in an area where E911 has been deployed by
> Cingular and the local PSAP. This means that Cingular customers do
> not
> need to upgrade their phones for Cingular's E911 technology to trace
> their location in an emergency.and i found this: AT&T Wireless,
> Cingular and T-Mobile are now opting for a more expensive yet less accurate
> network-based technology known as time difference of arrival, or TDOA, which
> AT&T Wireless and Cingular already are using in their TDMA networks.
> Network-based solutions have less accuracy requirements than the
> handset-based solutions such as E-OTD and assisted global positioning system
> (GPS) solutions U.S. CDMA carriers and Nextel are deploying. Network-based
> solutions such as TDOA are required to locate wireless 911 callers within
> 100 meters for 67 percent of calls and 300 meters for 95 percent of calls.
> Handset-based technology requires calls to be located within 50 meters for
> 67 percent of calls and 150 meters for 95 percent of calls

The network based solution makes more sense because GSM users can freely
change handsets, and this would also address the issue of foreign
handsets (Eurasian ones) dialing 911 who may not have compatible
emergency location requirements in their home country.

TH