Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
1998-07-23
2001-11-20
Chang, Vivian (Department: 2682)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S426100, C455S552100
Reexamination Certificate
active
06321096
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Technical Field
The invention concerns a method of controlling call routing through a communications network, and a communication terminal.
2. Discussion of Related Art
The invention starts with a communication system as described in EP 0738093. In this communication system a subscriber can be reached with a standardized call number, although he may have different types of communication terminals such as for example ISDN, GSM or DECT terminals, whereby he can be alternately reached.
A connection request directed to the subscriber is routed to a central network node of the communication system. This node translates the personal call number of the subscriber into the physical call number of the particular terminal for which the subscriber is registered. The connection is subsequently routed to the particular terminal for which the subscriber is registered.
In this case the registration takes place manually by the subscriber sending an explicit control message to the central node, or automatically through a DECT (Digital European Cordless Telephone) when the subscriber with his DECT terminal has moved into its covered range. The radio network base station of the DECT's access system detects the entrance of the DECT into its covered range and performs the registration in the central node.
A computer-controlled radio subscriber terminal which is suitable for operation in mobile radio networks with different system technologies, is known from EP 0297616 A1.
This subscriber radio terminal has two communication units. One of the communication units provides the means required to communicate via a first mobile radio network, and the other communication unit provides the means for communicating via a second, different type of mobile radio network. The subscriber radio terminal furthermore has an evaluation device which determines by means of the field strength of both mobile radio networks which one of the two communication units is activated and which one is blocked.
SUMMARY OF INVENTION
The object of the invention is to enable cost-effective communication with a mobile subscriber. This object is achieved by a method of controlling the call routing according to the principle of the method of the invention, and by a communication terminal according to the invention.
The invention is based on the idea of providing a communication terminal with an interface to a mobile radio network and to radio network base stations, which controls the network-side routing of connection requests directed to the terminal, by signalling the mobile radio network. On the one hand this has the advantage that a mobile subscriber can be reached through his call number via the most cost-effective access network, and on the other that the network-side cost of introducing this service feature is very small.
Thus, according to a first aspect of the invention, a method of controlling call routing via a communications network to a communication terminal, which is suitable for communicating in a first mode via a first radio interface with radio network base stations of the communications network, particularly with DECT stations, and for communicating in a second mode via a second radio interface with a mobile radio network of the communications network, is characterized in that the terminal determines whether it has moved into the range covered by radio network base stations, and that the terminal, if it has moved into the range covered by a selected radio network base station, initiates a switch-over of the network-side routing of connection requests, which are directed to the terminal, and routes them via the selected radio network base station by signalling the mobile radio network.
According to a second aspect of the invention, a communication terminal with a first communication unit for communicating with radio network base stations, particularly with DECT stations, via a first radio interface, is characterized in that the communication terminal is provided with a second communication unit for communicating with a mobile radio network via a second radio interface, and that the communication terminal is provided with a radio field evaluation device for ascertaining the range covered by radio network base stations, and with a control unit which is designed so that, if the terminal has moved into the range covered by a selected radio network base station, it initiates a switch-over of the network-side routing of connection requests which are directed to the terminal, and routes them via the selected radio network base station by signalling the mobile radio network.
It is particularly advantageous that the terminal controls the routing on the network-side by means of already existing signalling messages of the mobile radio network, for example through the signalling messages for attaching or detaching a terminal. This makes it possible that no intervention of any kind to the infrastructure on the network-side is required to carry out the invention. It merely requires a new type of terminal.
REFERENCES:
patent: 5127042 (1992-06-01), Gillig et al.
patent: 5260988 (1993-11-01), Schellinger et al.
patent: 5309502 (1994-05-01), Hirai
patent: 5509062 (1996-04-01), Carlsen
patent: 5675629 (1997-10-01), Raffel et al.
patent: 5774805 (1998-06-01), Zicker
patent: 5774806 (1998-06-01), Tayloe et al.
patent: 5890064 (1999-03-01), Widergren et al.
patent: 5901357 (1999-05-01), D'Avello et al.
patent: 5909650 (1999-06-01), Jonsson
patent: 5920815 (1999-07-01), Akhavan
patent: 5920820 (1999-07-01), Qureshi et al.
patent: 5924030 (1999-07-01), Rautiola et al.
patent: 6067456 (2000-05-01), Duran
patent: 4307966 (1994-09-01), None
patent: 4343335 (1995-06-01), None
patent: 4344702 (1995-07-01), None
patent: 19532069 (1997-01-01), None
patent: 19537087 (1997-04-01), None
patent: 196505223 (1997-08-01), None
patent: 0297616 (1989-01-01), None
patent: 0700227 (1996-03-01), None
patent: 0717578 (1996-06-01), None
patent: 0738093 (1996-10-01), None
patent: 0740482 (1996-10-01), None
patent: 9701918 (1997-01-01), None
patent: 9711567 (1997-03-01), None
“GSM und DECT in Dual-Mode-Handys” in Funkschau, 3/06, S. 22-7, s. insb. Ksp. “Technische Realisierung”.
“Mobilität in privaten Telekommunikationsnetzwerken (PTN)”.
D. Mosimann et al., In: tec 3/95 Das Technische Magazin von ascom, pp. 14-20.
Lautenschlager Wolfgang
Stahl Uwe
Tessmar Gerhard
Alcatel
Appiah Charles
Chang Vivian
Maguire, Jr. Francis J.
Oliver Milton
LandOfFree
Method of controlling call routing and a communication terminal does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of controlling call routing and a communication terminal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of controlling call routing and a communication terminal will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2618121