Network infrastructures based on wireless technology through electromagnetic waves and comprised of transmitter/receiver stations (base or Bass stations and repeaters), switching exchanges (radios and pagers) and mobile phones.
The technologies currently used most based on the working frequencies, bandwidths, types of information and network application are: GSM, GPRS, GSM-R, UMTS, LTE, TETRA, WIFI, and WIMAX.
The leading manufacturers of these technologies are Ericsson, Nokia, Huawei, Motorola, Siemens, NEC, Rochilla, Sele, Alcatel and ZTE.
