Cell Broadcast
Cell broadcast or Cell Broadcasting ( CB short ) is a mobile service for sending text messages.
In contrast to normal text, in which the message is addressed only to a particular mobile phone, a broadcast message is sent from the base station ( the transmitter mast ) to all phones that have this service activated and be in the same radio cell.
A broadcast message can be up to 93 characters long, but since you can string together several messages even longer texts can be transferred. The user sees the CB messages either on demand or as so-called " automatic display " in the form of a marquee in the home screen. The reception of CB is free.
The cell broadcast service is called with different providers with different names (eg " broadcast " or "Cell Info" ). Similar to the Teletext can be selected by dialing a three-digit number usually between different topics.
Since CB is free to the user, this service is usually financed by sponsors. At times, there were channels with different themes such as news ( ProSieben, Handelsblatt ), online services ( snap123 on channel 123 in the D2 network ) and weather forecasts. Since this retreat more and more, only available from many providers base themes available (location determination, collective information).
In general, channel 50 in many countries in a wide variety of mobile service providers for the location information in use. Thus, the local exchange codes that are relevant to specific tariffs were transferred at vodafone on the CB channels 50 and 100; on 1 April 2009, this information was set. On channel 837 vodafone sent at irregular intervals, date and time, just ten minutes; and on channel 833, the network element name (as of June 2008).
O ₂ sends the position of the base station in Gauss-Krueger - coordinates on channel 221. Thus, the mobile phones know their location and home and can show a house when the phone is in the home zone is located or city if it is in the City Zone. The first 6 digits of this result by 0 supplements the right value, the last 6 digits with an attached high value to 0.
T -Mobile Germany has the transmission of cell broadcast messages, according to a test mode, set again. E-Plus has never introduced this service.
In Switzerland, Swisscom sends the name of the region or the city where you are on channel 50. Larger cities are thereby usually divided into several geographic areas (eg, Zurich Airport, Zurich North -West, Zurich West, etc.).
The UMTS standard does not provide for cell broadcast channels, but offers SAB ( Service Area Broadcast), which performs the same function and also has more capacity.
Advanced Cell Broadcast
Vodafone in Germany sent from CB channels that were used for the so-called Vodafone ticker. This required a special client -equipped mobile phones necessary. The service vodafone ticker has been set for 31 December 2006. He was resumed on 1 January 2008.