Interference mitigation for control channels in a wireless communication network

• US 9,648,596 B2
• Filed: 06/03/2013
• Issued: 05/09/2017
• Est. Priority Date: 02/01/2008
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Palanki, Ravi, Khandekar, Aamod, Bhushan, Naga, Agrawal, Avneesh
• Primary Examiner(s): Nguyen, Hai V
• Application Number:
  US13/908,951
• Publication Number:
  US 20130265968A1
• Time in Patent Office: 1,436 Days
• Field of Search: 455522, 370329
• 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]
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Techniques for mitigating interference on control channels in a wireless communication network are described. In an aspect, high interference on radio resources used for a control channel may be mitigated by sending a request to reduce interference to one or more interfering stations. Each interfering station may reduce its transmit power on the radio resources, which may then allow the control channel to observe less interference. In one design, a user equipment (UE) may detect high interference on radio resources used for a control channel by a desired base station. The UE may send a request to reduce interference on the radio resources to an interfering base station, which may reduce its transmit power on the radio resources. The UE may receive the control channel on the radio resources from the desired base station and may observe less interference from the interfering base station.

Claims

1. A method for wireless communication, comprising:

receiving a first request, at a first user equipment (UE), to reduce interference on uplink radio resources used for communication with a base station, wherein the first request is based on a second request originating at a second UE and received at the base station;

reducing transmit power of the first UE on the uplink radio resources to reduce interference;

wherein at least one of the first UE is not served by the base station or the second UE is not served by the base station; and

wherein the second request is an initial access request or a handover request.

2. The method of claim 1, wherein the second request is based on:

a pathloss from the second UE to the base station based on a transmit power level and a received power level of the second request, and

a transmit power of the first UE on the uplink radio resources based on the pathloss and a target interference level for the uplink radio resources.

3. The method of claim 1, wherein the reducing transmit power comprises reducing transmit power of the first UE on the uplink radio resources to a lower level or zero.

4. The method of claim 1, wherein the reducing transmit power comprises steering a transmission from the first UE on the uplink radio resources away from the base station.

5. The method of claim 1, wherein the reducing transmit power comprises reducing the transmit power of the first UE on the uplink radio resources for a predetermined duration, a duration indicated by the request, or a duration determined based on at least one parameter with the first request.

6. The method of claim 1, further comprising:

determining the uplink radio resources used for the communication with the base station based on a hopping pattern and an identity of the base station.

7. An apparatus for wireless communication, comprising:

a memory; and

at least one processor coupled to the memory, and configured to

receive at first request, at a first user equipment (UE), to reduce interference on uplink radio resources used for the communication with a base station, wherein the first request is based on a second request originating from a second UE and received at the base station,

reduce transmit power of the first UE on the uplink radio resources to reduce interference;

wherein at least one of the first UE is not served by the base station or the second UE is not served by the base station; and

wherein the second request is an initial access request or a handover request.

8. The apparatus of claim 7, wherein the second request is based on:

a pathloss from the first UE to the second UE based on a transmit power level and a received power level of the first request, and

a transmit power of the second UE on the uplink radio resources based on the pathloss and a target interference level for the uplink radio resources.

9. The apparatus of claim 7, wherein the at least one processor is configured to reduce transmit power of the first UE on the uplink radio resources to a lower level or zero.

10. The apparatus of claim 7, wherein the at least one processor is configured to steer a transmission from the first UE on the uplink radio resources away from the base station.

11. The apparatus of claim 7, wherein the at least one processor is configured to reduce the transmit power of the first UE on the uplink radio resources for a predetermined duration, a duration indicated by the request, or a duration determined based on at least one parameter with the first request.

12. The apparatus of claim 7, wherein the at least one processor is configured to determine the uplink radio resources used by the base station based on a hopping pattern and an identity of the base station.

13. The apparatus of claim 7, wherein the first UE is not served by the base station, and the second UE is served by the base station.

14. An apparatus for wireless communication, comprising:

means for receiving a first request, at a first user equipment (UE), a request to reduce interference on uplink radio resources used for communication with a base station, wherein the first request is based on a second request originating at a second UE and received at the base station;

means for reducing transmit power of the first UE on the uplink radio resources to reduce interference;

wherein at least one of the first UE is not served by the base station or the second UE is not served by the base station;

wherein the second request is an initial access request or a handover request.

15. The apparatus of claim 14, wherein the second request is based on:

a pathloss from second UE to the base station based on a transmit power level and a received power level of the second request, and

a transmit power of the first UE on the uplink radio resources based on the pathloss and a target interference level for the uplink radio resources.

16. The apparatus of claim 14, wherein the means for reducing transmit power comprises means for reducing transmit power of the first UE on the uplink radio resources to a lower level or zero.

17. The apparatus of claim 14, wherein the means for reducing transmit power comprises means for steering a transmission from the first UE on the uplink radio resources away from the base station.

18. The apparatus of claim 14, wherein the means for reducing transmit power comprises means for reducing the transmit power of the first UE on the uplink radio resources for a predetermined duration, a duration indicated by the first request, or a duration determined based on at least one parameter associated with the first request.

19. The apparatus of claim 14, further comprising:

means for determining the uplink radio resources used by the base station based on a hopping pattern and an identity of the base station.

20. A computer program product, stored on a non-transitory computer-readable medium, comprising code for causing at least one computer to:

receive a first request, at a first user equipment (UE), to reduce interference on uplink radio resources used for communication with a base station, wherein the first request is based on a second request originating from a second UE and received at the base station;

reduce transmit power of the first UE on the uplink radio resources to reduce interference;

wherein at least one of the first UE is not served by the base station or the second UE is not served by the base station;

wherein the second request is an initial access request or a handover request.