Inter-rat interference cancellation

Patent metadata

Field	Value
Publication number	US-9641272-B2
Application number	US-201414523772-A
Country	US
Kind code	B2
Filing date	Oct 24, 2014
Priority date	Oct 24, 2014
Publication date	May 2, 2017
Grant date	May 2, 2017

Abstract

Methods, systems, and devices are described for eliminating interference from a convoluted signal comprising several signals of different radio access technologies (RATs), such as a Long Term Evolution (LTE) signal and wireless local area network (WLAN) signal, in an unlicensed or shared radio frequency spectrum band are described. In accordance with the present disclosure, a dual-radio mobile device may utilize a multiple radios to assist in the operation of interference cancellation. Specifically, in some examples, a first radio (e.g., WLAN radio) may process the received convoluted signal to reconstruct a first signal (e.g., WLAN signal). The reconstructed first signal may be utilized by a second radio (e.g., LTE radio) to identify a second signal (e.g., LTE signal) in the received convoluted signal by cancelling or removing the reconstructed first signal from the convoluted signal.

First claim

What is claimed is:

1. A method of wireless communication at a user equipment (UE), comprising:
receiving a convoluted signal comprising a plurality of radio access technology (RAT) waveforms over a shared channel;
determining that an interference level associated with the convoluted signal satisfies a threshold;
sending an indication to reconstruct a first signal of a first RAT waveform based on the determination that the threshold is satisfied, wherein the indication is sent to a first radio of the UE from a second radio of the UE;
reconstructing the first signal of the first RAT waveform from the plurality of RAT waveforms with the first radio in response to the indication; and
identifying a second signal of a second RAT waveform from the plurality of RAT waveforms with the second radio based on the reconstructed first signal.

2. The method of claim 1 , wherein determining that the interference level associate with the convoluted signal satisfies the threshold comprises determining that the interference level associated with the convoluted signal is greater than or equal to the threshold.

3. The method of claim 2 , wherein determining the interference level associated with the convoluted signal comprises identifying a signal-to-interference-plus-noise-ratio (SINR) of the convoluted signal.

4. The method of claim 1 , further comprising:
determining that the interference level associated with the convoluted signal is less than the threshold; and
sending an indication to cease signal reconstruction from the second radio to the first radio.

5. The method of claim 1 , further comprising:
decoding the convoluted signal with the first radio; and
reconstructing with the first radio a portion of the convoluted signal to generate the first signal.

6. The method of claim 5 , wherein decoding the convoluted signal with the first radio comprises:
identifying a modulation or coding scheme for the convoluted signal; and
demodulating a portion of the convoluted signal based on the modulation or coding scheme.

7. The method of claim 1 , wherein identifying the second signal comprises:
cancelling the reconstructed first signal of the first RAT waveform from the convoluted signal.

8. The method of claim 1 , wherein the first radio comprises a receiver and a packet reconstructor.

9. The method of claim 1 , wherein the first radio comprises a wireless local area network (WLAN) modem.

10. The method of claim 1 , wherein the second radio comprises a Long Term Evolution (LTE) receiver.

11. The method of claim 1 , wherein the first signal comprises a wireless local area network (WLAN) signal and the second signal comprises a Long Term Evolution (LTE) signal.

12. An apparatus for wireless communication at a user equipment (UE), comprising:
a receiver of a first radio configured to receive a convoluted signal comprising a plurality of radio access technology (RAT) waveforms over a shared channel;
an interference detector configured to determine that an interference level associated with the convoluted signal satisfies a threshold;
an inter-RAT interference enabler configured to send an indication to reconstruct a first signal of a first RAT waveform based on the determination that the threshold is satisfied, wherein the indication is sent to the first radio from a second radio;
a packet reconstructor of the first radio configured to reconstruct the first signal of the first RAT waveform from the plurality of RAT waveforms with the first radio in response to the indication;
a signal identifier of the second radio configured to identify a second signal of a second RAT waveform from the plurality of RAT waveforms based on the reconstructed first signal.

13. The apparatus of claim 12 ,
wherein the interference detector is configured to determine that the interference level associated with the convoluted signal is greater than or equal to the threshold.

14. The apparatus of claim 13 ,
wherein the interference detector is configured to determine that the interference level associated with the convoluted signal comprises identifying a SINR of the convoluted signal.

15. The apparatus of claim 12 ,
wherein the interference detector is configured to determine the interference level associated with the convoluted signal is less than a threshold; and wherein the apparatus further comprises:
an inter-RAT interference disabler configured to send an indication to cease signal reconstruction from the second radio to the first radio.

16. The apparatus of claim 12 , further comprising:
a decoder of the first radio configured to decode the convoluted signal; and
a signal generator of the first radio configured to reconstruct a portion of the convoluted signal to generate the first signal.

17. The apparatus of claim 16 , further comprising:
a modulation identifier configured to identify a modulation or coding scheme for the convoluted signal; and
a demodulator configured to demodulate a portion of the convoluted signal based on the modulation or coding scheme.

18. The apparatus of claim 12 , further comprising:
an interference remover configured to cancel the reconstructed first signal of the first RAT waveform from the convoluted signal.

19. The apparatus of claim 12 , wherein the first radio comprises a modem.

20. The apparatus of claim 12 , wherein the first radio comprises a wireless local area network (WLAN) modem.

21. The apparatus of claim 12 , wherein the second radio comprises a Long Term Evolution (LTE) receiver.

22. The apparatus of claim 12 , wherein the first signal comprises a WLAN signal and the second signal comprises a LTE signal.

23. An apparatus for wireless communication at a user equipment (UE), comprising:
means for receiving a convoluted signal comprising a plurality of radio access technology (RAT) waveforms over a shared channel;
means for determining that an interference level associated with the convoluted signal satisfies a threshold;
means for sending an indication to reconstruct a first signal of a first RAT waveform based on the determination that the threshold is satisfied, wherein the means for sending the indication is operable to send the indication to a first radio of the UE from a second radio of the UE;
means for reconstructing the first signal of the first RAT waveform from the plurality of RAT waveforms with the first radio in response to the indication; and
means for identifying a second signal of a second RAT waveform from the plurality of RAT waveforms with the second radio based on the reconstructed first signal.

24. The apparatus of claim 23 , further comprising:
means for determining that the interference level associated with the convoluted signal is greater than or equal to the threshold.

25. The apparatus of claim 24 , wherein determining the interference level associated with the convoluted signal comprises identifying a SINR of the convoluted signal.

26. The apparatus of claim 23 , further comprising:
means for determining that an interference level associated with the convoluted signal is less than a threshold; and
means for sending an indication to cease signal reconstruction from the second radio to the first radio.

27. A non-transitory computer-readable medium storing code for wireless communication at a user equipment (UE), the code comprising instructions executable to:
receive a convoluted signal comprisin

Assignees

• Qualcomm Inc

Inventors

• Wang Jibing

Classifications

• H04W84/12

  WLAN [Wireless Local Area Networks] · CPC title

• H04L27/0012

  arrangements for identifying the type of modulation · CPC title

• H04J11/0023 Primary

  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 title