Method and systems for paging a radiotelephone unit based on the unit's current cell location
View Patent ↗In the transmission of a message (LU) from a subscriber station (MS), a cell recognition signal (e.g. CI 2 ) identifying the current radio cell (e.g. C 2 ) in which the subscriber station (MS) is located is transmitted towards the mobile radio system with it and stored in a subscriber database (NVLR) of the mobile radio system. The stored cell recognition signal (e.g. CI 2 ) makes it possible to call the subscriber station (MS) via a radio message to the most recently used radio cell(s) (e.g. C 2 ) and possibly also to its/their neighboring radio cells. This reduces the signaling load on the transmission of the radio message (effective paging) in the area where there are radio cells. It is possible to derive the location information on the radio cell plane, which consists of the cell recognition to identify the radio cell last used by the subscriber station, without any additional signaling load.
1. A method for sending a radio paging broadcast to radiotelephone subscriber stations of mobile radiotelephone subscribers of a cellularly constructed mobile radiotelephone network, comprising the steps of:
managing locations of the radiotelephone subscriber stations by location areas that consist respectively of at least one radio cell and that are identifiable by a location area identifier;
calling radiotelephone subscriber stations in a location area by transmission of a radio paging broadcast;
sending, in a transmission of messages respectively sent by a respective radiotelephone subscriber station, a transmitted cell identifier that identifies a current radio cell in which the respective radiotelephone subscriber station is currently located, the transmitted cell identifier being sent in addition to the location area identifier;
storing the transmitted cell identifier in a subscriber database of the mobile radiotelephone network;
entering the transmitted cell identifier in a list of cell identifiers comprising both the transmitted cell identifier and retained cell identifiers which were formerly transmitted cell identifiers, thereby retaining transmitted cell identifiers; and
sending the paging broadcast to at least one cell listed in the list of cell identifiers.
2. The method according to claim 1 , wherein the radio paging broadcast is transmitted to a last-used radio cell determined by the stored cell identifier.
3. The method according to claim 1 , wherein the radio paging broadcast is transmitted to several last-used radio cells that are determined by the stored cell identifiers.
4. The method according to claim 1 , wherein the radio paging broadcast is transmitted to a last-used radio cell, and, in addition, to radio cells adjacent thereto that are determined by the stored cell identifiers.
5. The method according to claim 1 , wherein to increase a certainty of a hit during calling of the respective radiotelephone subscriber station, a time of transmission of the cell identifier is stored in the subscriber database, together with the cell identifier.
6. The method according to claim 1 , wherein if a paging response message that can be sent back by a radiotelephone subscriber station fails to appear, the radio paging broadcast is transmitted to all radio cells of a location area.
7. The method according to claim 1 , wherein the cell identifier and a time of transmission of the cell identifier are stored in a decentral subscriber database that is responsible for the radiotelephone subscriber stations located in an allocated location area.
8. The method according to claim 1 , wherein the cell identifier and a time of transmission of the cell identifier are stored in the subscriber database, together with a subscriber identifier that identifies the mobile radiotelephone subscriber.
9. The method according to claim 1 , wherein the cell identifier is respectively concurrently sent in data packets that are transmitted in the mobile radiotelephone network according to a data packet service.
10. A system for transmitting a radio paging broadcast to radiotelephone subscriber stations of mobile radiotelephone subscribers in location areas of a cellularly constructed mobile radiotelephone network, whereby the location areas respectively manage locations of the radiotelephone subscriber stations, and respectively consist of at least one radio cell, and are identifiable by a location area identifier, comprising:
the radiotelephone subscriber stations having means for transmitting messages that respectively contain, in addition to the location area identifier, a transmitted cell identifier that identifies a current radio cell in which a respective radiotelephone subscriber station is currently located; and
the mobile radiotelephone network having at least one subscriber database in which the transmitted cell identifier is entered in a list of cell identifiers comprising both the transmitted cell identifier and retained cell identifiers which were formerly transmitted cell identifiers, and the transmitted cell identifier is retained, the radio paging broadcast being sent to at least one cell listed in the list of cell identifiers.
11. The system according to claim 10 , wherein the mobile radiotelephone network has means for transmitting the radio paging broadcast to a last-used radio cell that is determined by the entered cell identifier.
12. The system according to claim 10 , wherein the mobile radiotelephone network is provided with means for transmitting the radio paging broadcast to several last-used radio cells determined by the entered cell identifiers.
13. The system according to claim 10 , wherein the mobile radiotelephone network has means for transmitting the radio paging broadcast to a last-used radio cell, and, in addition, to radio cells adjacent thereto as determined by the entered cell identifiers.