Editing Location-based service (section)

===Control plane locating===
With [[control plane]] locating, sometimes referred to as positioning, the mobile phone service provider gets the location based on the radio signal delay of the closest cell-phone towers (for phones without satellite navigation features) which can be quite slow as it uses the 'voice control' channel.<ref name="shuwang" /> In the [[United Kingdom|UK]], networks do not use trilateration; Because LBS services use a single base station, with a "radius" of inaccuracy, to determine a phone's location. This technique was the basis of the E-911 mandate and is still used to locate cellphones as a safety measure. Newer phones and [[Personal digital assistant|PDA]]s typically have an integrated [[Assisted GPS|A-GPS]] chip.

In addition there are emerging techniques like Real Time Kinematics and WiFi RTT (Round Trip Timing) as part of Precision Time Management services in WiFi and related protocols.

In order to provide a successful LBS technology the following factors must be met:
* coordinates accuracy requirements that are determined by the relevant service,
* lowest possible cost,
* minimal impact on network and equipment.

Several categories of methods can be used to find the location of the subscriber.<ref name = "sst"/><ref>[http://www.navigationevent.com/pdf/tyntec_kunz.pdf LBS Positioning Methods]  {{webarchive |url=https://web.archive.org/web/20130904005038/http://www.navigationevent.com/pdf/tyntec_kunz.pdf |date=September 4, 2013 }}</ref> The simple and standard solution is LBS based on a [[satellite navigation]] system such as [[Galileo (satellite navigation)|Galileo]] or [[GPS]]. [[Sony Ericsson]]'s "NearMe" is one such example; it is used to maintain knowledge of the exact location. Satellite navigation is based on the concept of [[trilateration]], a basic geometric principle that allows finding one location if one knows its distance from other, already known locations.