13 articles
A3/A8 algorithm
The A3/A8 algorithm is the pair of GSM security functions for subscriber authentication and cipher key generation, typically implemented as one operator-chosen algorithm on the SIM card.
A5/1
A5/1 is a stream cipher built from three shift registers that encrypts the radio link between handset and base station in GSM (2G) networks; designed in 1987, it is considered compromised.
Base station controller
A base station controller (BSC) is the GSM network element that manages one or more base transceiver stations and sits between them and the core network, controlling radio resources.
DCS 1800
DCS 1800, later renamed GSM 1800, is a variant of the GSM cellular standard operating in the 1800 MHz band, created by ETSI in 1990.
EDGE (telecommunication)
EDGE, or Enhanced Data rates for GSM Evolution (EGPRS), is a mobile technology that triples GSM data rates by adding 8PSK modulation, with first networks live in 2003.
EDGE Evolution
EDGE Evolution is a set of 3GPP Release 7 enhancements to the GSM/EDGE radio interface, raising peak data rates above 1 Mbps and cutting latency to around 100 ms.
GPRS
General Packet Radio Service (GPRS) is a packet-switched data service built on the GSM 2G mobile standard, often described as 2.5G, first launched commercially in 2000.
GSM
GSM, the Global System for Mobile Communications, is a 2G digital cellular standard developed in Europe in the late 1980s and adopted worldwide, using TDMA and the SIM card.
GSM 03.38
GSM 03.38, published today as 3GPP TS 23.038, is the specification defining SMS character encodings; its 7-bit alphabet lets a 140-byte message carry 160 characters.
GSM frequency bands
GSM frequency bands: paired FDD allocations (P/E/R-GSM 900, DCS 1800, GSM 850, PCS 1900, GSM 750/480) with 200 kHz carrier spacing, ARFCN numbering, duplex spacings of 45/95/30 MHz, and EU/CEPT regulatory history.
GSM services
GSM services are the telecommunication services a GSM mobile network offers its subscribers: voice calls, SMS, data, supplementary services such as call forwarding, and international roaming.
SIM Application Toolkit
The SIM Application Toolkit, also known as SIM Toolkit or STK, is a set of standardized commands letting SIM card applications control a phone's display, calls, and messaging.
Unstructured Supplementary Service Data
Unstructured Supplementary Service Data (USSD) is a GSM protocol for real-time text sessions between a handset and an operator's network, used to check balances and run mobile money.