Method for reducing interference

• US 20090252122A1
• Filed: 05/31/2005
• Published: 10/08/2009
• Est. Priority Date: 05/31/2005
• Status: Active Grant

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Corporation
• Inventors: Kangas, Pertti, Leinonen, Marko, Rousu, Seppo
• Granted Patent: US 8,170,063 B2
• Time in Patent Office: Days
• US Class Current: 370/332
• CPC Class Codes: H04W 36/06 Reselecting a communication resource in the serving access point
• CPC Class Codes: H04W 36/20 for optimising the interference level

Abstract

This invention relates to wireless communication systems, specifically to methods for reducing interference. The invention allows a mobile station to determine if certain transmissions of the mobile station cause interference to reception by a second receiver in the mobile station, and indicate to the network that a change in a transmission parameter of the mobile station is desired. The network can then change a transmission parameter to reduce interference observed by the second receiver.

Claims

1. Method in a mobile station of a wireless communication network, the mobile station having a first receiver and a first transmitter for communicating with the wireless communication network on at least a first frequency band, the mobile station having a second receiver for receiving transmissions on at least a second frequency band, comprising the steps of

determining if changing of a transmission parameter of the mobile station would cause less interference to reception by the second receiver by transmissions of the mobile station, and if it is so determined,

transmitting a message to the wireless communication network indicating a communication parameter.

2. A method according to claim 1, wherein

the message indicates a handover target radio channel.

3. A method according to claim 1, wherein

the message indicates a radio frequency of a second wireless communication network.

4. A method according to claim 1, wherein

the message indicates a handover target frequency band.

5. A method according to claim 1, wherein

the message indicates a second wireless communication network.

6. A method according to claim 1, wherein

the message indicates a handover target system modulation method.

7. A method according to claim 1, wherein

the message indicates timing information of a second wireless communication network.

8. A method according to claim 1, wherein

the message indicates timing information of a signal interfering reception by the second receiver.

9. A method according to claim 1, wherein

the message indicates a type of service received by the second receiver.

10. A method according to claim 1, wherein the message is a handover request message.

11. A method according to claim 1, wherein

the message indicates a power level of an interfering signal.

12. A method according to claim 1, wherein

the message indicates a transmission or reception power level of a second wireless communication network.

13. A method according to claim 1, wherein

the message indicates a frequency of an interfering signal.

14. A method according to claim 1, wherein

the message indicates location information of the mobile terminal.

15. A method according to claim 1, comprising the step of

transmitting an indication of more than one transmission channel, frequency band, or wireless communication network, and an indication of order of preference of the more than one transmission channel, frequency band, or wireless communication network.

16. A method according to claim 1, comprising the step of

transmitting an indication to the wireless communication network that reception by the second receiver has ended.

17. A method according to claim 1, wherein the message indicates a transmission parameter to be used in transmissions from the mobile station to the wireless communication network.

18. A method according to claim 1, wherein the message indicates a transmission parameter to be avoided in transmissions from the mobile station to the wireless communication network.

36. A software program product comprising computer software code means for carrying out the method according to claim 1.

19. A method in a wireless communication system, comprising the steps of

receiving a message from a mobile station,

extracting indication of a communication parameter from the received message, and

changing a communication parameter of the radio link between the wireless communication system and the mobile station as a response to receiving the message.

20. A method according to claim 19, comprising the step of

initiating handover to a channel, frequency band, or a wireless communication system indicated in the message.

21. A method according to claim 19, comprising the steps of

receiving an indication from a mobile station that reception by a second receiver in the mobile station has finished, and

initiating a handover as a response to receiving the indication.

22. A method according to claim 19, comprising the steps of

receiving information from the mobile station about timing of reception by a second receiver in the mobile station, and

adjusting a communication parameter on the basis of the received timing information.

23. A method according to claim 19, comprising the steps of

receiving information from the mobile station about a frequency band received by a second receiver in the mobile station,

selecting a handover target at least in part on the basis of the received information about the frequency band, and

initiating a handover to the selected handover target.

24. A method according to claim 19, comprising the steps of

receiving information from the mobile station about a type of service received by a second receiver in the mobile station,

selecting a handover target at least in part on the basis of the received information about a type of service, and

initiating a handover to the selected handover target.

25. A method according to claim 23, wherein the handover target is a channel.

26. A method according to claim 23, wherein the handover target is a frequency band.

27. A method according to claim 23, wherein the handover target is a wireless communication network.

37. A software program product comprising computer software code means for carrying out the method according to claim 19.

28. A mobile station having a first transmitter and a first receiver for communicating with a wireless communication network on at least a first frequency band and a second receiver for receiving transmissions on at least a second frequency band, comprising

a controller for determining if changing of a transmission parameter of the mobile station would cause less interference to reception by the second receiver by transmissions of the mobile station, and

a transmitter for transmitting, as a response to a positive determination by the controller, a message to the wireless communication network indicating a communication parameter.

29. A mobile station according to claim 28, comprising

a controller for transmitting information to the wireless communication network about timing of reception by the second receiver.

30. A mobile station according to claim 28, comprising

a controller for transmitting information to the wireless communication network about a second frequency band.

31. A mobile station according to claim 28, comprising

a controller for transmitting information to the wireless communication network about the type of service received by the second receiver.

32. A mobile station according to claim 28, comprising

a controller for transmitting an indication of more than one transmission channel, frequency band, or wireless communication network, and an indication of order of preference of the more than one transmission channel, frequency band, or wireless communication network.

33. A mobile station according to claim 28, comprising

a controller for transmitting, as a response to ending of reception by the second receiver, an indication to the wireless communication network that reception by the second receiver has ended.

34. A network element for a wireless communication system, comprising

a controller for extracting an indication of a communication parameter from a message received from a mobile station, and

a controller for changing a transmission parameter of the radio link between the wireless communication system and the mobile station as a response to extracting a communication parameter from a message received from a mobile station.

35. A system in a wireless communication network, comprising

a controller for extracting an indication of a communication parameter from a message received from a mobile station, and

a controller for changing a transmission parameter of the radio link between the wireless communication system and the mobile station as a response to extracting a communication parameter from a message received from a mobile station.

38. An integrated circuit for a mobile station of a wireless communication network, the mobile station having a first transmitter, a first receiver, and at least a second receiver, comprising

a controller for determining if changing of a transmission parameter of the mobile station would cause less interference to reception by the second receiver by transmissions of the mobile station, and

a message transmitter for initiating, as a response to a positive determination by the controller, transmission of a message to the wireless communication network indicating a communication parameter.

39. An integrated circuit according to claim 38, further comprising

an information structure containing information about at least one transmission parameter for the first transmitter causing interference to reception on a channel or a frequency band by the second receiver.

40. An integrated circuit according to claim 38, further comprising

a calculator for calculating harmonic frequencies of transmissions of the first transmitter, and

a controller for determining whether a harmonic frequency of a transmission by the first transmitter falls within a reception channel or a frequency band of the second receiver.