G-I | IP Location

gateway mobile location center (GMLC)

The GMLC provides location information from a UMTS or GSM network. The GMLC has a number of clients, including LCS applications, emergency services, and network services.

General Packet Radio Service (GPRS)

GPRS is a "2.5G" enhancement to GSM that adds a packet data service.

Geographic Information System (GIS)

A GIS is a computer system that uses, creates, edits, or stores geographic or spatial data. Usually this involves visualization of features as maps with overlaid detail.

Geographic Location/Privacy (GEOPRIV)

The IETF GEOPRIV working group is looking at aspects of location, in particular privacy issues relating to the use of location information in respect to a person.

geoid

A mathematical representation of the Earth, usually described as an oblate spheroid.

Global Navigation Satellite System (GNSS)

A GNSS is a navigation system that uses satellites to provide navigational and time data to ground-based systems.

Global Positioning System (GPS)

GPS is a GNSS developed by the U.S. military, now in wide civilian use.

See also Global Navigation Satellite System (GNSS).

Global System for Mobile Communications (GSM)

GSM is a "2G" cellular network technology that uses a time division for signal separation. The acronym was originally used for Groupe Special Mobile, which started standards development. GSM standards cover all aspects of network architecture from modulation schemes to roaming models.

Home Agent (Mobile IP) (HA)

In Mobile IP, the Home Agent provides a way for a roaming IP device to be contacted through a well-known identifier. The HA also provides a mechanism to support seamless handovers for a device roaming between two remote networks.

Home Subscriber Server (HSS)

The HSS (or, previously, the Home Location Register) houses subscriber records in 3GPP network architectures. The HSS can be thought of as a presence server.

HTTP Enabled Location Delivery (HELD)

HELD is a location acquisition protocol. See Chapter 4.

HyperText Transfer Protocol (HTTP)

HTTP is the widely used protocol for the retrieval of documents over the Internet.

i2

i2 is the common name of the NENA interim VoIP architecture for providing enhanced 911 services. This standard provides a migration towards IP-based telephony by allowing VoIP callers to access existing emergency infrastructure.

i3

i3 is the name given to the NENA architecture under development which will support a fully IP-enabled emergency infrastructure.

instant message (IM)

An instant message is a small unit of data that is sent for immediate display to others. IM services rely on presence for addressing information amongst other data.

Institute of Electrical and Electronics Engineers (IEEE)

The IEEE is a professional group and standards development organization (SDO) that is responsible for administering the 802.x series of standards, which include Ethernet (802.3), WiFi (802.11), and WiMAX (802.16).

Internet Engineering Task Force (IETF)

The IETF is a standards development organization (SDO) responsible for Internet protocols.

International Mobile Station Identifier (IMSI)

The IMSI is a unique identifier for a GSM or UMTS terminal that is stored in the subscriber identity module (SIM).

Internet Protocol (IP)

IP is the network protocol used on the Internet. Two versions of IP are used, 4 and 6, with version 4 being the most widely used.

Internet Protocol Control Protocol (IPCP)

IPCP is the control protocol for PPP