Method of Cutting Off a Transmission Signal of a Main Transmitter Relayed by a Cell of a Base Station and Associated System

• US 20120115533A1
• Filed: 04/01/2010
• Published: 05/10/2012
• Est. Priority Date: 04/03/2009
• Status: Active Grant

• Current Assignee: ST-Ericcson SA (Telefonaktiebolaget LM Ericsson)
• Original Assignee: ST-Ericcson SA (Telefonaktiebolaget LM Ericsson)
• Inventors: Dorbes, Stephane, Mignot, Christophe
• Granted Patent: US 9,008,713 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04W 52/221 using past power control commands
• CPC Class Codes: H04W 52/228 using past power values or information
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range

Abstract

Method of cutting off a transmission signal of a main transmitter relayed by a cell of a base station and associated system. According to this method, the transmission signal is cut off:—if the power of the transmission signal emitted by the main transmitter is greater than the power of each transmission signal of other transmitters relayed by the same cell of the base station, and—if the power of the transmission signal of the main transmitter does not decrease after several identical successive transmitted-power regulating commands (TPC) emitted by the base station.

Claims

1. A method of cutting off a transmission signal of a main transmitter relayed by a cell of a base station, wherein the transmission signal is cut off:

if the power of the transmission signal emitted by the main transmitter is greater than the power of each transmission signal of other transmitters relayed by the same cell of the base station, and

if the power of the transmission signal of the main transmitter does not decrease after several identical successive transmitted-power regulating commands (TPC) emitted by the base station.

2. The method according to claim 1, in which the power variation commands of the transmitted-power regulating commands (TPC) emitted by the base station, on the one hand, are summed and the corresponding variations of effective power that are emitted by the main transmitter, on the other hand, are summed for a number of transmitted-power regulating commands (TPC), the sum of the power variation commands is compared with the sum of the variations of corresponding effective power, and the transmission signal of the main transmitter is cut off if the sum of the power variation commands is different from the sum of the variations of corresponding effective power.

3. The method according to claim 2, in which the power variation commands of the transmitted-power regulating commands (TPC) emitted by the base station, on the one hand, and the corresponding variations of effective power that are emitted by the main transmitter, on the other hand, are summed for a number of transmitted-power regulating commands, if the effective power emitted by the main transmitter is greater than an effective-power threshold (Power threshold).

4. The method according to claim 2, in which the sum of the power variation commands is compared with the sum of the variations of corresponding effective power if the sum of the power variation commands is greater than a control power variation threshold (threshold1).

5. The method according to claim 2, in which a subtraction is carried out between the sum of the power variation commands and the sum of the variations of corresponding effective power, and the transmission signal of the main transmitter is cut off if the difference between the sum of the power variation commands and the sum of the variations of corresponding effective power is greater than a tolerance threshold (threshold2).

6. A system for cutting off the transmission signal of a main transmitter relayed by a cell of a base station, the main transmitter comprising means for receiving transmitted-power regulating commands (TPC) emitted by a base station and means for transmitting the signal emitted by the main transmitter, comprising first integration means able to compute a sum of the power variation commands of the transmitted-power regulating commands (TPC) emitted by the base station, second integration means able to compute a sum of the corresponding variations of effective power that are emitted by the main transmitter, comparison means able to compare the sum of the power variation commands with the sum of the variations of corresponding effective power, and means for generating a cut-off signal.

7. The system according to claim 6, comprising parametrization means able to deliver a signal indicating the moment of starting of the first and second integration means, and the number of transmitted-power regulating commands (TPC) for which the sums are computed.

8. The system according to claim 6, comprising a threshold module able to deliver an effective-power threshold (Power threshold) above which the system operates.

9. The system according to claim 6, comprising a first comparison module able to compare the sum of the power variation commands of the transmitted-power regulating commands with a control power variation threshold value (threshold1).

10. The system according to claim 6, in which the comparison means comprise a subtraction module able to compute the difference between the sum of the power variation commands and the sum of the variations of corresponding effective power.

11. The system according to claim 6, in which the comparison means comprise a second comparison module able to compare the difference between the sum of the power variation commands and the sum of the variations of corresponding effective power with a tolerance threshold value (threshold2).

12. The system according to claim 6, in which the main transmitter is a European third-generation mobile telephone, and the base stations are base stations of a network of Universal Mobile Telecommunications System type.