The coverage area is the geographic area served by a certain system, such as a mobile system or a broadcasting system, in which the service is available to the users.

IEEE 802.11 is a set of standards for a wireless local area network (wlan). The standard is better known as Wi-Fi. IEEE 802.11 comprises of a number of standards. The original 802.11 standard was publ [..]

The International Mobile Subscriber Identity (IMSI) is an internationally standardized unique number to identify a mobile subscriber. The IMSI is defined in ITU-T Recommendation E.212. The IMSI consis [..]

Orthogonal Frequency Division Multiplexing (OFDM) is a transmission technology in which the data is divided over a large number of radio frequencies. Each radio frequencies carries only a small portio [..]

The data rate is a term to denote the transmission speed, or the number of bits per second transferred. The useful data rate for the user is usually less than the actual data rate transported on the n [..]

The Global Navigation Satellite System GLONASS is a Russian-operated satellite navigation system, to provide users their position and time anywhere in the world or near-Earth space. GLONASS is nearly [..]

GNSS (Global Navigation Satellite System) is an umbrella term that incorporates all systems that provide world wide positioning based on satellites, including GPS, GLONASS and Galileo.

Quadrature Amplitude Modulation (QAM) is a combination of amplitude shift keying and phase shift keying. The bitstream is broken up into groups of e.g. 3 or 4 bits. Each bitgroup combination is given [..]

A ring topology is a topology for a Local Area Network (LAN) in which every device has exactly two neighbours for communication purposes.

Authentication, Authorization and Accounting (AAA) a related set of functions. First, a user has to be authenticated. Secondly, the user is granted access to the network. Finally, all necessary inform [..]