Registration of Radio Network Change Based Title of the Invention on A CS Fallback Mechanism

Abstract

A method for the switchover of a mobile terminal device from a first radio network of a mobile radio system to a second radio network is described. The switchover is carried out on the basis of a CS fallback mechanism, and whereby, on the basis of the switchover, the mobile terminal device logs on to a base station of the second radio network in order to establish a connection. In conjunction with the log-on, the mobile terminal device transmits a notification pertaining to the CS fallback mechanism to the base station, and the base station registers the log-on of the terminal device as a function of the notification. Moreover, a base station and to a mobile terminal device for carrying out the method are also described herein.

What is claimed is: 
     
         1 . A method for switching over a mobile terminal device from a first radio network of a mobile radio system to a second radio network of the mobile radio system, whereby switching over is carried out on the basis of a circuit-switched (CS) fallback mechanism, and whereby, on the basis of switching over, the mobile terminal device logs on to a base station of the second radio network in order to establish a connection, wherein, in conjunction with logging-on, the mobile terminal device transmits a notification to the base station of the second radio network station indicating that the CS fallback mechanism has been used, and the base station registers a log-on of the terminal device as a function of the notification. 
     
     
         2 . The method according to  claim 1 , whereby a checking procedure is carried out to ascertain whether the log-on of the terminal device to the base station of the second radio network is successful, and the log-on of the terminal device is registered, together with an outcome indicator that is determined as a function of a result of the checking procedure. 
     
     
         3 . The method according to  claim 1 , whereby a base station of the first radio network prompts the terminal device to carry out switching over and, on the basis of prompting, the base station of the first radio network registers a switchover attempt has been made within scope of the CS fallback mechanism. 
     
     
         4 . The method according to  claim 3 , whereby the log-on of the terminal device is registered in the base station of the second radio network and/or the switchover attempt is registered in the base station of the first radio network pertaining to a specific radio cell of the second radio network that receives its feed from the base station of the second radio network. 
     
     
         5 . A base station for use in a second radio network of a mobile radio system, whereby mobile terminal devices can be logged on to the base station in order to establish a connection, and whereby the base station is configured to receive a notification sent by a mobile terminal device in conjunction with the log-on, and to register the log-on of the mobile terminal device as a function of the received notification, whereby the notification provides information that the log-on of the mobile terminal device is being carried out on the basis of a switchover from a first radio network to the second radio network within the scope of a CS fallback mechanism. 
     
     
         6 . The base station of  claim 5 , whereby a checking procedure is carried out to ascertain whether the log-on of the mobile terminal device to the base station of the second radio network is successful, and the log-on of the mobile terminal device is registered, together with an outcome indicator that is determined as a function of a result of the checking procedure. 
     
     
         7 . The base station of  claim 5 , whereby a base station of the first radio network prompts the mobile terminal device to carry out switching over and, on the basis of prompting, the base station of the first radio network registers a switchover attempt has been made within scope of the CS fallback mechanism. 
     
     
         8 . The base station of  claim 7 , whereby the log-on of the terminal device is registered in the base station of the second radio network and/or the switchover attempt is registered in the base station of the first radio network pertaining to a specific radio cell of the second radio network that receives its feed from the base station of the second radio network. 
     
     
         9 . A mobile terminal device for use in a mobile radio system, whereby the mobile terminal device is configured to make a switchover from a first radio network of the mobile radio system to a second radio network of the mobile radio system on the basis of a CS fallback mechanism and, on the basis of switching over, to log on to a base station of the second radio network in order to establish a connection, wherein the mobile terminal device is configured in such a way that, in conjunction with the log-on, a notification pertaining to the CS fallback mechanism that can be registered in the base station is transmitted to the base station. 
     
     
         10 . The mobile terminal device of  claim 9 , whereby a checking procedure is carried out to ascertain whether the log-on of the mobile terminal device to the base station of the second radio network is successful, and the log-on of the terminal device is registered, together with an outcome indicator that is determined as a function of a result of the checking procedure. 
     
     
         11 . The mobile terminal device of  claim 9 , whereby a base station of the first radio network prompts the mobile terminal device to carry out switching over and, on the basis of prompting, the base station of the first radio network registers a switchover attempt has been made within scope of the CS fallback mechanism. 
     
     
         12 . The mobile terminal device of  claim 11 , whereby the log-on of the mobile terminal device is registered in the base station of the second radio network and/or the switchover attempt is registered in the base station of the first radio network pertaining to a specific radio cell of the second radio network that receives its feed from the base station of the second radio network.