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GSM Location Based Services provide personalised services
to the subscriber based on their current position. Two categories
of methods can be used to find the location of the subscriber:
basic and Advanced. Basic positioning methods are based on
the knowledge of the cell the subscriber is using (cell ID).
This can be used alone, or together with other information
available in the network such as timing advance (TA) and network
measurement reports (NMR). This information is available for
all handsets.
Advanced techniques will be available in new handsets such
as Enhanced Observed Time Difference (E-OTD) and Assisted
GPS (A-GPS)which uses the GSM network to help the reception
of the freely available GPS system.
The division of position technologies above is based on accuracy
of the positioning method. Other factors, also very important
are for example complexity of the system, availability of
the positioning technology in the network (e.g. A-GPS may
not be available everywhere) and the investment needed on
the network side and in handsets
The Services Group (SerG) of the GSM Association has produced
a Permanent Reference Document (PRD SE.23) on Location Base
Services (LBS).
The objective of this PRD is to:
- Brief the operator community at large on Location Based
Services (LBS) and examples thereof.
- Develop guidelines and requirements for roaming and interoperability
between operators.
- Help GSMA develop strategies to build pro-active co-operation
with other significant industry fora.
- To provide operational guidelines to operators in advance
of the availability of technical standards (e.g. inter-GMLC
interface).
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Download the SE.23 Permanent Reference
Document on Location Based Services
(1.2MB - PDF)
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