| Gain |
Gain refers to the ratio of the output amplitude of a signal to the input amplitude of a signal. This ratio typically is expressed in dBs. The higher the gain, the better the antenna receives or transmits but also the more noise it includes.
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| GAN: Global Area Network |
Global Area Network (GAN) is a network that is composed of different interconnected computer networks and covers an unlimited geographical area.
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| Gaussian channel |
Gaussian channel is an RF communications channel having the properties of a wide-band uniform noise spectral density resulting in a random distribution of errors in the channel.
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| GEOS: Geo-stationary Earth Orbit Systems |
Geo-stationary Earth Orbit Systems (GEOS) is a communications system with satellites in geosynchronous orbits -- 22,300 miles above the Earth.
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| Geosynchronous Orbit |
A geosynchronous orbit has the same orbital period as the sidereal rotation period of the Earth. It has a semi-major axis of 42,164 km.
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| GERAN: GSM (GPRS)/EDGE Radio Access Netw |
GSM(GPRS)/EDGE Radio Access Network (GERAN) is the name given to the 3GPP standards for GSM(GPRS)/EDGE radio access, which has been specified to connect the A, Gb and Iu interfaces to the CN (Core Network). The architecture allows two BSS (Base Station Subsystem) to be connected to each other.
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| GGSN: Gateway GPRS Support Node |
Gateway GPRS Support Node (GGSN) is a gateway from a cellular network to an IP network that allows mobile cell phone users to access the public data network (PDN) or specified private IP networks. The GPRS Core Network is the centralised part of the GPRS system and also provides support for UMTS-based 3G networks.
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| GHz: GigaHertz |
GigaHertz (GHz) is one billion hertz, which is a measurement of frequency.
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| Gi interface |
Gi interface is the reference point between a GPRS network and an external packet data network.
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| GIS: geographic information system |
Geographical Information System (GIS) refers to a computer system capable of capturing, storing, analyzing, and displaying geographically referenced information, that is, data identified according to location. Practitioners also define a GIS as including the procedures, operating personnel, and spatial data that go into the system.
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| GLONASS: global navigation system |
Global navigation system (GLONASS) is a Russian satellite location technology similar to global positioning system.
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| GMM/SM: GPRS Mobility Management / Sessi |
GPRS Mobility Management/Session Management (GMM/SM) protocol supports mobility management functionality of a mobile such as GPRS attach, GPRS detach, security, routing area update, location update. The main function of the Session Management (SM) layer is to support PDP context handling of the user terminal. SM comprises of procedures for the PDP context activation, deactivation and modification. The GMM layer uses the services of the Radio Access Network Application Protocol (RANAP) over the Iu interface to provide these services.
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| GMM: GPRS Mobility Management |
GPRS Mobility Management (GMM) is a GPRS signaling protocol that handles mobility issues such as roaming, authentication, and selection of encryption algorithms. GPRS Mobility Management, together with Session Management (GMM/SM) protocol, supports the mobility of user terminal so that the SGSN can know the location of a mobile station (MS) at any time and to activate, modify and deactivate the PDP sessions required by the MS for the user data transfer.
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| GMPCS: Global Mobile Personal Communicat |
Global Mobile Personal Communications Services (GMPCS) is a mobile satellite systems that will provide global wireless phone service.
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| GMSK: Gaussian Minimum Shift Keying |
Gaussian Minimum Shift Keying (GMSK) is a modulation technique involving Gaussian filtering of the input data prior to its application to the phase modulator. This results in a narrowly occupied spectrum and better adjacent channel interference performance.
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| Gn Interface |
Gn Interface is the interface between GSNs within the same PLMN in a GPRS network. GPRS Tunneling Protocol (GTP) is a protocol defined on both the Gp and Gn interfaces between GSNs in a GPRS network.
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| GOS: Grade of Service |
Grade of Service (GOS) is a measure of the success a subscriber is expected to have in accessing a network to complete a call. The grade of service is usually expressed as percentage of calls attempted by the subscriber during the busy-hour that are blocked due to insufficient network resources.
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| Gp Interface |
Gp Interface is the Interface between GSNs within different PLMNs in a GPRS network. GPRS Tunneling Protocol (GTP) is a protocol defined on both the Gp and Gn interfaces between GSNs in a GPRS network.
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| GPRS: General Packet Radio Service |
General Packet Radio Service (GPRS) technology runs at speeds of up to 115Kbit/sec., compared with the 9.6Kbit/sec. of older GSM systems. It enables high-speed wireless Internet and other communications such as e-mail, games and applications. It supports a wide range of bandwidths and is an efficient use of limited bandwidth. It's particularly suited for sending and receiving small amounts of data, such as e-mail and Web browsing, as well as large volumes of data.
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| GPS: Global Positioning System |
The Global Positioning System (GPS) is a "constellation" of 24 satellites that orbit the Earth at a height of 10,900 miles, making it possible for people using ground receivers to determine their geographic location within 10 to 100 meters. The satellites use simple mathematical calculations to broadcast information that is translated as longitude, latitude and altitude by Earth-based receivers.
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| GPT: GPRS Tunneling Protocol |
GPRS Tunneling Protocol (GTP) is a protocol used by the GPRS backbone network for packet switching. GTP is a protocol defined on both the Gn and Gp interfaces between GSNs in a GPRS network.
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| Ground Station |
Ground Station, also called a downlink station, refers to the collection of communications equipment designed to receive signals from (and usually transmit signals to) satellites.
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| GSM 1800 |
GSM 1800, also known as DCS 1800 or PCN, is a moble network working on a frequency of 1800 MHz. It is used in Europe, Asia-Pacific and Australia.
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| GSM 1900 |
GSM 1900, also known as PCS 1900, is a mobile 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.
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| GSM 900 |
GSM 900, or just GSM, is the world's most widely used digital network -- now operating in over 100 countries around the world, particularly in Europe and Asia Pacific.
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