Technology / Cell Phones Glossary

Gateway: Node that connect two different networks.

Gateway GPRS Support Node (GGSN): Interface between the GPRS wireless data network and other networks such as the Internet or private networks.

General Packet Radio Service (GPRS): A GSM data transmission technique that does not set up a continuous channel from a portable terminal for the transmission and reception of data, but transmits and receives data in packets. G . . . View Full Definition

Global Positioning System (GPS): A system of 24 satellites for identifying earth locations, launched by the U.S. By triangulation of signals from three of the satellites, a receiving unit can pinpoint its current location a . . . View Full Definition

Global System for Mobile Communications (GSM): GSM is a digital cellular phone technology based on TDMA that is the predominant system Europe, the Middle East, Africa, Asia and in parts of America and Canada. First introduced in 1991, th . . . View Full Definition

Globalstar: Second major LEO-based global communications system; initially created for voice, it was launched in late 1999.

GSM 1800: Also known as DCS 1800 or PCN, GSM 1800 is a digital network working on a frequency of 1800 MHz. It is used in Europe, Asia-Pacific and Australia.

GSM 1900: Also known as PCS 1900, GSM 1900 is a digital network working on a frequency of 1900 MHz. It is used in the US and Canada and is scheduled for parts of Latin America and Africa.

GSM 900: The world's most widely used digital network and now operating in over 100 countries around the world, particularly in Europe and Asia Pacific.

GSM Hosted SMS Teleservice (GHOST): A tunneling protocol that allows a GSM SMS to be embedded in a teleservice that can be transmitted over the air interface of a TDMA based network.

Half-Rate: A variant of GSM, Half-Rate doubles system capacity by more efficient speech coding.

Handheld Device Markup Language (HDML): A specialized version of HTML designed to enable wireless pagers, cell phones and other handheld devices to obtain information from Web pages. HDML was developed by Phone.com (formerly Unwir . . . View Full Definition

Handoff: The process by which the Mobile Telephone Switching Office passes a cellular phone conversation from one radio frequency in one cell to another radio frequency in another. The handoff is per . . . View Full Definition

Hands-Free: An important safety feature that's included with most of today's mobile phones. It permits drivers to use their cellular phone without lifting or holding the hand-set to their ear.

Handset Subsidy: Frequently, a wireless company will sell a phone (handset) below cost, with the hope of making up the loss later on customer usage fees. The amount of loss per handset is called the handset subsidy.

Hertz (Hz): A unit of measurement of one cycle per second when one radio wave passes one point in one second of time. Named in honor of Heinrich Hertz, the physicist who developed the theory of radio waves.

High-Speed Circuit Switched Data (HSCSD): The final evolution of circuit switched data within the GSM environment. HSCSD enables the transmission of data over a GSM link at speeds of up to 57.6kbit-s. This is achieved by concatenati . . . View Full Definition

Home Location Register (HLR): A database residing in a local wireless network that contains service profiles and checks the identity of a local subscriber.

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