MOBILE COMMUNICATION Prepared by: Kaiypbergen A Gazizova A Algozha E Bolatuly N
Mobile communications - kind of telecommunications, in which voice, text and graphic information is transmitted to the subscriber wireless terminals are not tied to a particular place or area. Differ satellite, cellular, trunk, etc. Mobile species.
The most common today is a kind of mobile cellular communications. Cellular services are provided to subscribers of operating companies. Wireless cellular phone base station provides network. Each station provides access to a network in a limited area, the area and the configuration of which depends on the terrain and other factors. Overlapping coverage create a structure similar to a honeycomb; by this way, and there is the term "cellular". When moving his phone subscriber is served by one or the other base station, the switching is automatic, completely transparent to the user, and does not affect the quality of communication. This approach allows using mobile low-power radio network to cover large areas, allowing this communication mean, in addition to efficiency, also the highest level of environmental performance.
The history of cellular communication.
Networks in the first civil cellular standards NMT-450 - appeared in 1981. Although the standard name is a contraction of the words Nordic Mobile Telephony ( «mobile telephony Nordic"), the first on the planet cellular network was launched in Saudi Arabia. In Sweden, Norway, Finland (and the other Nordic countries) NMT network earned a few months later. Two years later - in 1983 - the United States launched the first network standard AMPS (Advanced Mobile Phone Service), created at Bell Laboratories research center.
Other mobile communication systems. DECT Paging Trunking network satellite connection
cellular networks non voice services. Cell (mobile) phone - a user terminal operating in a cellular network. In fact, each cellular telephone is a specialized computer that is focused primarily on providing voice communication subscribers, but also supports the exchange of text and multimedia messaging, and the modem is provided with a simplified interface. Voice and data mobile phones provide advanced digital. The subscribers of cellular networks available a range of no voice services
services
Thanks for attention!
Скачать презентацию MOBILE COMMUNICATION Prepared by Kaiypbergen A Gazizova A
MOBILE COMMUNICATION.pptx