Techniques for performing carrier sense adaptive transmission in unlicensed spectrum

• US 10,356,623 B2
• Filed: 09/15/2014
• Issued: 07/16/2019
• Est. Priority Date: 09/24/2013
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Sadek, Ahmed Kamel, Naghshvar, Mohammad, Valliappan, Nachiappan
• Primary Examiner(s): Cho, Un C
• Assistant Examiner(s): Perez, Jose L
• Application Number:
  US14/486,114
• Publication Number:
  US 20150085683A1
• Time in Patent Office: 1,765 Days
• CPC Class Codes: H04L 43/0894 Packet rate
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 72/1215 for collaboration of different radio technologies

Abstract

Aspects for reducing interference between networks are provided. A signal transmitted by a first network over a communications medium using an unlicensed frequency spectrum is decoded to determine one or more parameters of a packet in the signal. A level of utilization of the communications medium by the first network can be estimated based at least in part on a signal strength of the signal and the one or more parameters. A time for communicating in a second network over the communications medium using the unlicensed frequency spectrum can be adjusted based at least in part on the level of utilization of the communications medium by the first network.

Claims

1. A method for reducing interference between networks, comprising:

decoding a first signal transmitted by a first network over a communications medium using an unlicensed frequency spectrum to determine one or more parameters of a data packet in the signal;

decoding a second signal transmitted by the first network over the communications medium;

determining that the second signal includes an acknowledgement packet associated with the data packet;

determining a signal-to-noise ratio (SNR) associated with a first signal strength of the first signal;

determining, based on determining that the second signal includes the acknowledgement packet associated with the data packet, a signal-to-interference ratio (SIR) as a function of at least a second signal strength of the second signal;

utilizing, based on determining that the second signal includes the acknowledgement packet associated with the data packet and where a function including both of the SNR and the SIR achieves a threshold, a duration of the first signal in computing a level of utilization of the communications medium by the first network; and

adjusting a time for communicating in a second network over the communications medium using the unlicensed frequency spectrum based at least in part on the level of utilization of the communications medium by the first network; and

communicating, based on the time as adjusted, in the second network by transmitting over the communications medium using the unlicensed frequency spectrum.

2. The method of claim 1, wherein decoding the signal is based at least in part on determining the first signal strength of the first signal is at least at a threshold level.

3. The method of claim 1, wherein the one or more parameters include one or more of the duration of the first signal, a modulation and coding scheme (MCS) of the first signal, or a type of the data packet.

4. The method of claim 3, wherein determining the SNR is based at least in part on the MCS of the first signal, and wherein determining the SIR is further based at least in part on both of the first signal strength of the first signal and a transmit power for communicating in the second network.

5. The method of claim 3, wherein determining the SNR is based at least in part on the MCS of the first signal, and wherein determining the SIR is further based at least in part on all of the first signal strength of the first signal, a noise power related to the first signal, and a transmit power for communicating in the second network.

6. The method of claim 3, wherein utilizing the duration of the first signal in computing the level of utilization of the communications medium is further based on comparing the second signal strength to a threshold.

7. The method of claim 3, wherein determining the SNR is based at least in part on the MCS of the first signal, wherein determining the SIR is further based at least in part on both of the first signal strength of the first signal and a transmit power for communicating in the second network, and wherein utilizing the duration of the first signal in computing the level of utilization of the communications medium comprises applying, based at least in part on comparing the function of the SNR and the SIR to one or more thresholds, a weight to the duration of the signal.

8. The method of claim 3, wherein determining the SNR is based at least in part on the MCS of the first signal, wherein determining the SIR is further based at least in part on all of the first signal strength of the first signal, a noise power related to the first signal, and a transmit power for communicating in the second network, and wherein utilizing the duration of the first signal in computing the level of utilization of the communications medium comprises applying, based at least in part on comparing the function of the SNR and the SIR to one or more thresholds, a weight to the duration of the signal.

9. The method of claim 3, wherein utilizing the duration of the first signal in computing the level of utilization of the communications medium comprises applying, based at least in part on comparing the second signal strength of the second signal to one or more thresholds, a weight to the duration of the signal.

10. The method of claim 1, wherein communications by the second network are based on Carrier Sense Adaptive Transmission (CSAT), the method further comprising receiving the first signal during a period in which transmission by the second network is OFF (T_OFF) in a CSAT cycle of a CSAT ON period.

11. The method of claim 1, wherein the first network is a Wi-Fi network and the second network is a Long Term Evolution (LTE) network.

12. An apparatus for reducing interference between networks, comprising:

a memory; and

at least one processor coupled to the memory, wherein the at least one processor is configured to execute;

a signal decoding component configured to decode a first signal transmitted by a first network over a communications medium using an unlicensed frequency spectrum and decode a second signal transmitted by the first network over the communications medium;

a signal parameters evaluating component configured to determine one or more parameters of a data packet in the first signal and determine that the second signal includes an acknowledgement packet associated with the data packet;

a medium utilization estimating component configured to;

determine a signal-to-noise ratio (SNR) associated with a first signal strength of the first signal;

determine, based on determining that the second signal includes the acknowledgement packet associated with the data packet, a signal-to-interference ratio (SIR) as a function of at least a second signal strength of the second signal; and

utilize, based on determining that the second signal includes the acknowledgement packet associated with the data packet and where a function including both of the SNR and the SIR achieves a threshold, a duration of the first signal in computing a level of utilization of the communications medium by the first network;

a communication time adjusting component configured to adjust a time for communicating in a second network over the communications medium using the unlicensed frequency spectrum based at least in part on the level of utilization of the communications medium by the first network; and

a communication device configured to communicate, based on the time as adjusted, in the second network by transmitting over the communications medium using the unlicensed frequency spectrum.

13. The apparatus of claim 12, wherein the signal decoding component is configured to decode the first signal based at least in part on determining the first signal strength of the first signal is at least at a threshold level.

14. The apparatus of claim 12, wherein the one or more parameters include one or more of the duration of the first signal, a modulation and coding scheme (MCS) of the first signal, or a type of the data packet.

15. The apparatus of claim 14, wherein the medium utilization estimating component is configured to:

determine the SNR based at least in part on the MCS of the first signal; and

determine the SIR further based at least in part on both of the first signal strength of the first signal and a transmit power for communicating in the second network.

16. The apparatus of claim 14, wherein the medium utilization estimating component is configured to:

determine the SNR based at least in part on the MCS of the first signal; and

determine the SIR further based at least in part on all of the first signal strength of the first signal, a noise power related to the first signal, and a transmit power for communicating in the second network.

17. The apparatus of claim 14, wherein the medium utilization estimating component is configured to utilize the duration of the first signal in computing the level of utilization of the communications medium based on comparing the second signal strength to a threshold.

18. The apparatus of claim 14, wherein the medium utilization estimating component is configured to:

determine the SNR based at least in part on the MCS of the first signal;

determine the SIR based at least in part on both of the first signal strength of the first signal and a transmit power for communicating in the second network; and

apply, based at least in part on comparing the function of the SNR and the SIR to one or more thresholds, a weight to the duration of the signal in computing the level of utilization of the communications medium by the first network.

19. The apparatus of claim 14, wherein the medium utilization estimating component is configured to:

determine the SNR based at least in part on the MCS of the first signal;

determine the SIR based at least in part on all of the first signal strength of the first signal, a noise power related to the first signal, and a transmit power for communicating in the second network; and

apply, based at least in part on comparing the function of the SNR and the SIR to one or more thresholds, a weight to the duration of the signal in computing the level of utilization of the communications medium by the first network.

20. The apparatus of claim 14, wherein the medium utilization estimating component is further configured to apply, based at least in part on comparing the second signal strength to one or more thresholds, a weight to the duration of the signal in computing the level of utilization of the communications medium by the first network.

21. The apparatus of claim 12, wherein communications by the second network are based on Carrier Sense Adaptive Transmission (CSAT), the method further comprising a signal receiving component configured to receive the first signal during a period in which transmission by the second network is OFF (T_OFF) in a CSAT cycle of a CSAT ON period.

22. The apparatus of claim 12, wherein the first network is a Wi-Fi network and the second network is a Long Term Evolution (LTE) network.

23. An apparatus for reducing interference between networks, comprising:

means for decoding a first signal transmitted by a first network over a communications medium using an unlicensed frequency spectrum and decoding a second signal transmitted by the first network over the communications medium;

means for determining one or more parameters of a data packet in the first signal and determining that the second signal includes an acknowledgement packet associated with the data packet;

means for determining a signal-to-noise ratio (SNR) associated with a first signal strength of the first signal;

means for determining, based on determining that the second signal includes the acknowledgement packet associated with the data packet, a signal-to-interference ratio (SIR) as a function of at least a second signal strength of the second signal;

means for utilizing, based on determining that the second signal includes the acknowledgement packet associated with the data packet and where a function including both of the SNR and the SIR achieves a threshold, a duration of the first signal in computing a level of utilization of the communications medium by the first network;

means for adjusting a time for communicating in a second network over the communications medium using the unlicensed frequency spectrum based at least in part on the level of utilization of the communications medium by the first network; and

means for communicating, based on the time as adjusted, in the second network by transmitting over the communications medium using the unlicensed frequency spectrum.

24. The apparatus of claim 23, wherein the one or more parameters include one or more of the duration of the first signal, a modulation and coding scheme (MCS) of the first signal, or a type of the data packet.

25. The apparatus of claim 24, wherein the means for determining the SNR determines the SNR based at least in part on the MCS of the first signal, and wherein the means for determining the SIR determines the SIR based at least in part on both of the first signal strength of the first signal and a transmit power for communicating in the second network.

26. The apparatus of claim 24, wherein the means for determining the SNR determines the SNR based at least in part on the MCS of the first signal, and wherein the means for determining the SIR determines the SIR based at least in part on all of the first signal strength of the first signal, a noise power related to the first signal, and a transmit power for communicating in the second network.

27. A non-transitory computer-readable storage medium storing computer executable code that, when executed by a processor, causes the processor to:

decode a first signal transmitted by a first network over a communications medium using an unlicensed frequency spectrum;

decode a second signal transmitted by the first network over the communications medium;

determine one or more parameters of a data packet in the first signal;

determine that the second signal includes an acknowledgement packet associated with the data packet;

determine a signal-to-noise ratio (SNR) associated with a first signal strength of the first signal;

determine, based on determining that the second signal includes the acknowledgement packet associated with the data packet, a signal-to-interference ratio (SIR) as a function of at least a second signal strength of the second signal;

utilize, based on determining that the second signal includes the acknowledgement packet associated with the data packet and where a function including both of the SNR and the SIR achieves a threshold, a duration of the first signal in computing a level of utilization of the communications medium by the first network;

adjust a time for communicating in a second network over the communications medium using the unlicensed frequency spectrum based at least in part on the level of utilization of the communications medium by the first network; and

communicate, based on the time as adjusted, in the second network by transmitting over the communications medium using the unlicensed frequency spectrum.

28. The non-transitory computer-readable storage medium of claim 27, wherein the one or more parameters include one or more of the duration of the first signal, a modulation and coding scheme (MCS) of the first signal, or a type of the data packet.

29. The non-transitory computer-readable storage medium of claim 28, wherein the code, when executed by the processor, causes the processor to:

determine the SNR based at least in part on the MCS of the first signal; and

determine the SIR based at least in part on both of the first signal strength of the first signal and a transmit power for communicating in the second network.

30. The non-transitory computer-readable storage medium of claim 28, wherein the code, when executed by the processor, causes the processor to:

determine the SNR based at least in part on the MCS of the first signal; and

determine the SIR based at least in part on all of the first signal strength of the first signal, a noise power related to the first signal, and a transmit power for communicating in the second network.