Method for transferring intersystem connections
First Claim
1. A method for controlling an intersystem connection transfer from a first radiocommunication system having a first transmission method to a second radiocommunication system having a second transmission method, comprising:
- in a first step, determining a transmission quality at a subscriber station, with respect to transmission characteristics from the subscriber station to a supplying base station of the first radiocommunication system;
comparing the transmission quality with a first threshold value;
activating a compressed mode if the transmission quality falls below the first threshold value, the compressed mode generating at least one transmission gap in a time frame of the first transmission method;
determining transmission characteristics at the subscriber station with respect to a base station of the second radiocommunication system within the at least one transmission gap;
comparing the transmission quality with a second threshold value;
in a subsequent second step, detecting, at the subscriber station, information sequences transmitted by the base station of the second radiocommunication system in a control channel only if the transmission quality with respect to transmission characteristics from the subscriber station to the supplying base station of the first radiocommunication system falls below the second threshold; and
selecting the base station of the second radio communication system for the connection transfer on the basis of the determined transmission characteristics and the detected information sequences.
1 Assignment
0 Petitions
Accused Products
Abstract
To transfer intersystem connections, the quality of a transfer to a supplying base station in a first radiocommunication system is determined at a given moment by a subscriber station and compared to a threshold value. If the value falls below said threshold, a compressed mode is activated and measurements are carried out by the subscriber station in relation to the transfer qualities to neighboring base stations in a second radiocommunication network. On the basis of said measurements, the subscriber station selects a base station for the transfer of a connection. If the value falls below the second threshold, information sequences in the organization channels of the selected base stations are detected by the subscriber station.
14 Citations
16 Claims
-
1. A method for controlling an intersystem connection transfer from a first radiocommunication system having a first transmission method to a second radiocommunication system having a second transmission method, comprising:
-
in a first step, determining a transmission quality at a subscriber station, with respect to transmission characteristics from the subscriber station to a supplying base station of the first radiocommunication system; comparing the transmission quality with a first threshold value; activating a compressed mode if the transmission quality falls below the first threshold value, the compressed mode generating at least one transmission gap in a time frame of the first transmission method; determining transmission characteristics at the subscriber station with respect to a base station of the second radiocommunication system within the at least one transmission gap; comparing the transmission quality with a second threshold value; in a subsequent second step, detecting, at the subscriber station, information sequences transmitted by the base station of the second radiocommunication system in a control channel only if the transmission quality with respect to transmission characteristics from the subscriber station to the supplying base station of the first radiocommunication system falls below the second threshold; and selecting the base station of the second radio communication system for the connection transfer on the basis of the determined transmission characteristics and the detected information sequences. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. A subscriber station to control an intersystem connection transfer from a base station of a first radiocommunication system having a first transmission method to a base station of a second radiocommunication system having a second transmission method, the subscriber station comprising:
-
a first determination unit to determine, in a first step, a transmission quality, with respect to transmission characteristics with a supplying base station of the first radiocommunication system; a first comparison unit to compare the transmission quality with a first threshold value; an activation unit to activate a compressed mode if the transmission quality falls below the first threshold value, the compressed mode generating at least one transmission gap in a time frame of the first transmission method; determining transmission characteristics at the subscriber station with respect to a base station of the second radiocommunication system within the at least one transmission gap; a second comparison unit to compare the transmission quality with a second threshold value; a detection unit to detect, in a subsequent second step, at the subscriber station, information sequences transmitted by the base station of the second radiocommunication system in a control channel only if the transmission quality with respect to transmission characteristics from the subscriber station to the supplying base station of the first radiocommunication system falls below the second threshold; and a selection unit to select a suitable base station of the second radio communication system for the connection transfer on the basis of the determined transmission characteristics and the detected information sequences.
-
-
16. A method for controlling an intersystem connection transfer from a first radiocommunication system having a first transmission method to a second radiocommunication system having a second transmission method, comprising:
-
in a first step, determining a transmission quality at a subscriber station, with respect to transmission characteristics from the subscriber station to a supplying base station of the first radiocommunication system; comparing the transmission quality with a first threshold value; activating a compressed mode if the transmission quality falls below the first threshold value, the compressed mode generating at least one transmission gap in a time frame of the first transmission method; determining transmission characteristics at the subscriber station with respect to a base station of the second radiocommunication system within the at least one transmission gap; comparing the transmission quality with a second threshold value; in a subsequent second step, detecting, at the subscriber station, information sequences transmitted by the base station of the second radiocommunication system in a control channel only if the transmission quality with respect to transmission characteristics from the subscriber station to the supplying base station of the first radiocommunication system falls below the second threshold; and selecting the base station of the second radio communication system for the connection transfer on the basis of the determined transmission characteristics and the detected information sequences.
-
Specification