Method and apparatus that facilitates interference reduction in wireless systems

• US 9,509,543 B2
• Filed: 06/25/2010
• Issued: 11/29/2016
• Est. Priority Date: 06/26/2009
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Gaal, Peter, Palanki, Ravi
• Primary Examiner(s): Hsu, Alpus H
• Assistant Examiner(s): DIVITO, WALTER J
• Application Number:
  US12/824,123
• Publication Number:
  US 20110158211A1
• Time in Patent Office: 2,349 Days
• US Class Current: 1/1
• CPC Class Codes: H04J 11/0023 Interference mitigation or co-ordination direct sequence spread spectrum [DSSS] systems H04B1/7097; frequency hopping H04B1/713; allocation criteria for ingress interference avoidance H04L5/0062; frequency allocation criteria for requirements on out-of-channel emissions H04L5/0066; arrangements for removing intersymbol interference or baseband equalisers H04L25/03006; peak power aspects in multicarrier modulation H04L27/2614; power management H04W52/00; traffic scheduling H04W72/54, H04W72/541
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 25/023 with extension to other symbols
• CPC Class Codes: H04L 27/2647 Arrangements specific to the receiver only equalisation H04L27/01
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

Techniques for managing interference in a wireless communication system are disclosed. In one aspect, an estimated interference associated with data transmission over a plurality of subcarriers on an uplink is determined The estimated interference may relate to intermodulation products associated with a parallel transmission over the plurality of subcarriers. Based at least partly on the estimated interference, data received on the downlink can be processed, and subcarriers can be selected for data transmission on the uplink. Additionally, resources can be assigned to a wireless device according to the estimated interference.

Claims

1. A method of wireless communication, comprising:

determining an estimated interference associated with a data transmission over a plurality of subcarriers on an uplink;

transmitting a set of information relating to the estimated interference to a base station, wherein the set of information comprises frequency locations of intermodulation products associated with the plurality of subcarriers; and

processing data received over at least one subcarrier on a downlink based at least in part on the estimated interference, wherein processing data received over the at least one subcarrier comprises zeroing a log-likelihood ratio (LLR) for modulation symbols of the at least one subcarrier.

2. The method of claim 1, wherein determining the estimated interference comprises determining intermodulation products associated with the plurality of subcarriers.

3. The method of claim 2 wherein determining the estimated interference comprises identifying the at least one subcarrier as having a frequency within a range of frequencies related to the intermodulation products.

4. The method of claim 1, further comprising suspending the data transmission on at least one of the plurality of subcarriers based at least in part on the estimated interference.

5. The method of claim 4, wherein suspending the data transmission is responsive to a scheduling from a base station.

6. The method of claim 1, further comprising selecting a subcarrier for transmitting data on the uplink based at least in part on the estimated interference.

7. The method of claim 1, wherein the plurality of subcarriers comprise a first set of subcarriers associated with a first wireless access technology and second set of subcarriers associated with a second wireless access technology.

8. The method of claim 7, wherein the first wireless access technology comprises a long term evolution (LTE) system and the second wireless access technology is one of a code division multiple access (CDMA) system or a WiFi system.

9. The method of claim 1, wherein the plurality of subcarriers comprise a plurality of discontiguous subcarriers available for a parallel data transmission on the uplink.

10. An wireless communications apparatus, comprising:

a processor configured to execute computer executable components stored in a memory, including;

an estimation component configured to determine an estimated interference associated with a data transmission over a plurality of subcarriers on an uplink;

a communication component configured to transmit a set of information relating to the estimated interference to a base station, wherein the set of information comprises frequency locations of intermodulation products associated with the plurality of subcarriers; and

a signal processing component configured to process data received over at least one subcarrier on a downlink based at least in part on the estimated interference and configured to zero a log-likelihood ratio (LLR) for modulation symbols of the at least one subcarrier.

11. The apparatus of claim 10, wherein the estimation component is configured to determine intermodulation products associated with the plurality of subcarriers.

12. The apparatus of claim 11, wherein the estimation component is configured to identify the at least one subcarrier as having a frequency within a range of frequencies related to intermodulation products.

13. The apparatus of claim 10, further comprising a communication component configured to suspend the data transmission on at least one of the plurality of subcarriers based at least in part on the estimated interference.

14. The apparatus of claim 13, wherein the communication component is configured to suspend the data transmission in response to a scheduling from a base station.

15. The apparatus of claim 10, further comprising a transmission component configured to select a subcarrier for transmitting data on the uplink based at least in part on the estimated interference.

16. The apparatus of claim 10, wherein the plurality of subcarriers comprise a first set of subcarriers associated with a first wireless access technology and second set of subcarriers associated with a second wireless access technology.

17. The apparatus of claim 16, wherein the first wireless access technology comprises a long term evolution (LTE) system and the second wireless access technology is one of a code division multiple access (CDMA) system or a WiFi system.

18. The apparatus of claim 10, wherein the plurality of subcarriers comprise a plurality of discontiguous subcarriers available for a parallel data transmission on the uplink.

19. A computer program product that facilitates wireless communication, comprising:

a non-transitory computer-readable storage medium comprising code for causing at least one computer to;

determine an estimated interference associated with a data transmission over a plurality of subcarriers on an uplink;

transmit a set of information relating to the estimated interference to a base station, wherein the set of information comprises frequency locations of intermodulation products associated with the plurality of subcarriers; and

process data received over at least one subcarrier on a downlink based at least in part on the estimated interference by zeroing a log-likelihood ratio (LLR) for modulation symbols of the at least one subcarrier.

20. An wireless communications apparatus, the apparatus comprising:

means for determining an estimated interference associated with a data transmission over a plurality of subcarriers on an uplink;

means for transmitting a set of information relating to the estimated interference to a base station, wherein the set of information comprises frequency locations of intermodulation products associated with the plurality of subcarriers; and

means for processing data received over at least one subcarrier on a downlink based at least in part on the estimated interference, wherein the means for processing data received over the at least one subcarrier comprises means for zeroing a log-likelihood ratio (LLR) for modulation symbols of the at least one subcarrier.

21. A method of wireless communication, comprising:

determining an estimated interference associated with a data transmission by a wireless device over a plurality of subcarriers;

receiving an indication from the wireless device relating to frequency locations of intermodulation products associated with the plurality of subcarriers; and

assigning resources to the wireless device based at least in part on the estimated interference.

22. The method of claim 21, wherein determining the estimated interference comprises determining intermodulation products associated with the plurality of subcarriers.

23. The method of claim 21, wherein determining the estimated interference is based at least in part on the indication received from the wireless device.

24. The method of claim 23, wherein the frequency locations of the intermodulation products are related to data transmissions of the wireless device over at least a first wireless access technology and a second wireless access technology.

25. The method of claim 24, wherein the first wireless access technology comprises a long term evolution (LTE) system and the second wireless access technology is one of a code division multiple access (CDMA) system or a WiFi system.

26. The method of claim 21, wherein assigning resources to the wireless device comprises scheduling the wireless device on an uplink subcarrier.

27. The method of claim 21, wherein assigning resources to the wireless device comprises scheduling the wireless device on a downlink subcarrier.

28. An wireless communications apparatus, comprising:

a processor configured to execute computer executable components stored in a memory, the components including;

an estimation component configured to determine an estimated interference associated with a data transmission by a wireless device over a plurality of subcarriers;

a communication component configured to receive an indication from the wireless device relating to frequency locations of intermodulation products associated with the plurality of subcarriers; and

an assigning component configured to assign resources to the wireless device based at least in part on the estimated interference.

29. The apparatus of claim 28, wherein the estimation component is configured to determine intermodulation products associated with the plurality of subcarriers.

30. The apparatus of claim 28, wherein the estimation component is configured to determine the estimated interference based at least in part on the indication received from the wireless device.

31. The apparatus of claim 30, wherein the frequency locations of the intermodulation products are related to data transmissions of the wireless device over at least a first wireless access technology and a second wireless access technology.

32. The apparatus of claim 31, wherein the first wireless access technology comprises a long term evolution system and the second wireless access technology is one of a code division multiple access (CDMA) system or a WiFi system.

33. The apparatus of claim 28, wherein the assigning component is configured to schedule the wireless device on an uplink subcarrier.

34. The apparatus of claim 28, wherein the assigning component is configured to schedule the wireless device on a downlink subcarrier.

35. A computer program product that facilitates wireless communication, comprising:

a non-transitory computer-readable storage medium comprising code for causing at least one computer to;

determine an estimated interference associated with a data transmission by a wireless device over a plurality of subcarriers;

receive an indication from the wireless device relating to frequency locations of intermodulation products associated with the plurality of subcarriers; and

assign resources to the wireless device based at least in part on the estimated interference.

36. A wireless communications apparatus, comprising:

means for determining an estimated interference associated with a data transmission by a wireless device over a plurality of subcarriers;

means for receiving an indication from the wireless device relating to frequency locations of intermodulation products associated with the plurality of subcarriers; and

means for assigning resources to the wireless device based at least in part on the estimated interference.