Power control in a radio system

• US 6,574,485 B1
• Filed: 05/30/2000
• Issued: 06/03/2003
• Est. Priority Date: 09/30/1998
• Status: Expired due to Fees

• Current Assignee: Nokia Networks (Nokia Corporation)
• Original Assignee: Nokia Corporation
• Inventors: Lappeteläinen, Oscar, Salonaho, Oscar
• Primary Examiner(s): Hunter, Daniel
• Assistant Examiner(s): TRAN, TUAN A
• Application Number:
  US09/580,753
• Time in Patent Office: 1,099 Days
• Field of Search: 455/522, 455/450-453, 455/455, 455/464, 455/69, 455/63
• US Class Current: 455/522
• CPC Class Codes: H04W 52/244 Interferences in heterogeneous networks, e.g. among macro and femto or pico cells or other sector / system interference [OSI]

Abstract

The invention concerns a method of power regulation in a radio system including at least two transmitters, e.g. base transceiver stations, transmitting at the same frequency and receivers, e.g. mobile stations, which have set up a radio communication with the former. In the method according to the invention, the results of measurements of co-channel adjacent transmitter signals are used, besides the results of measurements of the radio communication to be relayed, in making the power regulation decision. From the results of measurements of adjacent transmitter signals to be transmitted with the monitored radio communication at the same frequency and in the same time slot, an estimate is determined of that interference caused to the radio communication, which is to be compensated for by a regulation of the transmission power of the desired signal.

Claims

1. A method of power regulation in a radio system, the system including at least two transmitters transmitting at the same frequency and at least one receiver having set up a radio connection with a first of the transmitters, the method comprising:

at the receiver, performing measurements of the signal of the radio connection, and of signals which are co-channel signals with respect to the radio connection and which originate from transmitters other than said first transmitter;

determining attenuation of the radio path of at least one of the co-channel signals; and

at the first transmitter, regulating the transmission power of the radio connection based on the results of the measurements of the radio connection signal and co-channel signals, including the determined attenuation.

2. The method as defined in claim 1, wherein the total interference caused by co-channels is calculated by determining radio path attenuation and a long-term transmission power estimate for each co-channel signal, and the transmission power is regulated based on the signal of the radio connection and on the calculated total interference.

3. The method as defined in claim 2, wherein the total interference caused by co-channels is calculated in the base station controller.

4. The method as defined in claim 3, wherein the power regulation requirement of several radio connections is determined in the base station controller, so that the new transmission power of each radio connection is determined taking into account the new transmission power of the other connections.

5. The method as defined in claim 1, wherein the transmission power of the transmitter is increased when the interference caused by co-channel signals is great, and the transmitter'"'"'s transmission power is reduced, when the interference caused by co-channel signals is small.

6. The method as defined in claim 1, wherein the measurement results are supplied from the receiver to the transmitter of the radio connection, and the attenuation of co-channel signals is determined in the transmitter of the radio connection.

7. The method as defined in claim 1, wherein the attenuation of co-channel signals is determined in the receiver, and the transmission power regulation information is supplied from the receiver to the transmitter of the radio connection.

8. The method as defined in claim 1, wherein frequency hopping is used in the radio connection.

9. The method as defined in claim 1, wherein the transmission in the radio connection is in packet form.

10. A power regulation method in a mobile communications system, the system including at least two base transceiver stations transmitting at the same frequency and at least one mobile station having set up a radio connection with a first of the base transceiver stations, the method comprising:

in the mobile station, performing measurements of the signal of the radio connection, and of signals which are co-channel signals with respect to the radio connection and which originate from a base transceiver station other than the first base transceiver station;

determining attenuation of the radio path of at least one of the co-channel signals; and

at the first transceiver, regulating the transmission power of the radio connection based on the results of measurements of the radio connection signal and co-channel signals, including the determined attenuation.