Broadcast Messages and Paging
Practically every cellular system has some kind of broadcast mechanism. This can be used directly for distributing information to multiple mobiles, commonly, for example in mobile telephony systems, the most important use of broadcast information is to set up channels for one to one communication between the mobile transceiver and the base station. This is called paging. The three different paging procedures generally adopted are sequential, parallel and selective paging.
The details of the process of paging vary somewhat from network to network, but normally we know a limited number of cells where the phone is located (this group of cells is called a Location Area in the GSM or UMTS system, or Routing Area if a data packet session is involved; in LTE, cells are grouped into Tracking Areas). Paging takes place by sending the broadcast message to all of those cells. Paging messages can be used for information transfer. This happens in pagers, in CDMA systems for sending SMS messages, and in the UMTS system where it allows for low downlink latency in packet-based connections.
Read more about this topic: Cellular Network
Famous quotes containing the words broadcast and/or messages:
“Listening to a news broadcast is like smoking a cigarette and crushing the butt in the ashtray.”
—Milan Kundera (b. 1929)
“Acknowledging separation feelings directly and sympathetically is the best way of coping with them. It is actually helpful to tell a toddler “I’ll miss you,” or “I will think of you during the day,” or “It is hard to say goodbye,” or “I can’t wait to see you at the end of the day.” These messages tell the child that he is important to the parent even when they are not together and that out of sight need not mean out of mind.”
—Alicia F. Lieberman (20th century)