Mms, MPEG4, Nmt, Packet Switching Service

M-P

MMS

Multimedia Messaging Service is a new standard that is being defined for use in advanced wireless terminals. The service concept is derived from Short Message Service and allows for non-real-time transmission of various kinds of multimedia contents like images, audio, video clips, etc. As a further evolution of the current text mail, for example, electronic postcards, audio/video clips, etc. can be sent.

MPEG4

MPEG4 is a technology for compressing voice, video and related control data and is one of the MPEG (Moving Picture Experts Group) international standards. It is currently a focus of attention due to the fact that it enables high speed and stable video transmission even in heretofore difficult environments such as mobile communication. Incorporation of this leading edge technology will imbue 3G terminals with a rich multimedia capability.

Mobile Switching Center. Equipped with a switching function for mobile communication.

NMT

Nordic Mobile Telephone. Analog cellular system originally developed for use in Finland, Sweden, Denmark, Norway and Iceland. NMT is operated in 450 MHz and 900 MHz bands.

PACKET SWITCHING SERVICE

A communication system whereby data is divided and transmitted in packets of set size. Its special feature is that communication between terminals with differing speeds and formats is possible since transmission/ reception is performed after data has first been stored at the exchange. In contrast to circuit-switching where a circuit is occupied until all data transfer has been completed, packet-switching improves efficiency through common use of circuits.

PCN

Personal Communications Network. A standard for digital mobile phone transmissions operating at a frequency of 1800 MHz (also referred to as OSM 1800). Adopted mainly in urban areas of Europe.

PCS

Personal Communication Service. Digital mobile phone network which operates at the 1900 MHz frequency band. GSM 1900 is one of the technologies used in building PCS networks (also referred to as PCS 1900 or DCS 1900). Such networks employ a range of technologies including GSM, TDMA and cdmaOne.