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1. (WO2017155436) METHODS FOR REDUCING INTERFERENCE IN A WIRELESS COMMUNICATIONS NETWORK
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1. A method performed by a transmitting node (1 10) for reducing interference in a wireless communications network (100), the method comprising

receiving (201) information indicating that inference caused by an interfering node (1 11) to a transmission signal from the transmitting node (1 10) fulfills a timing condition relative to the reception of the transmission signal in a receiving node (121) in the wireless communications network (100); and

adjusting (202) one or more transmission parameters in the transmitting node (1 10) based on the received information.

2. The method according to claim 1 , wherein the timing condition is that the

inference is received earlier than the reception of the transmission signal in the receiving node (121), or that the inference is received at the same time as the reception of the transmission signal in the receiving node (121), or that the inference is received later than the reception of the transmission signal in the receiving node (121).

The method according to claim 2, wherein, when the timing condition indicates that the inference is received earlier than the transmission signal in the receiving node (121), the adjusting (202) comprises:

- decreasing a channel sensing threshold, and/or

- increasing the transmission power of transmission signals from the transmitting node (1 10).

4. The method according to claim 2 or 3, wherein, when the timing condition

indicates that the inference is received later than the reception of transmissions in the receiving node (121), the adjusting (202) comprises:

- initiating an Request-to-Transmit/Clear-to-Transmit, RTS/CTS, procedure in the wireless communications network (100), and/or

- increasing the transmission power of transmission signals from the transmitting node (1 10).

5. The method according to any of claims 2-4, wherein, when the timing condition indicates that the inference is received at the same time as the reception of the transmission signal in the receiving node (121), the adjusting (202) comprises increasing a contention window size in the transmitting node (1 10).

A transmitting node (110) for reducing interference in a wireless communications network (100), the transmitting node (1 10) is configured to

receive information indicating that inference caused by an interfering node (1 11) to a transmission signal from the transmitting node (110) fulfills a timing condition relative to the reception of the transmission signal in a receiving node (121) in the wireless communications network (100), and adjust one or more transmission parameters in the transmitting node (1 10) based on the received information.

The transmitting node (1 10) according to claim 6, wherein the timing condition is that the inference is received earlier than the reception of the transmission signal in the receiving node (121), or that the inference is received at the same time as the reception of the transmission signal in the receiving node (121), or that the inference is received later than the reception of the transmission signal in the receiving node (121).

The transmitting node (1 10) according to claim 7, wherein, when the timing condition indicates that the inference is received earlier than the transmission signal in the receiving node (121), the transmitting node (110) is configured to adjust one or more transmission parameters by decreasing a channel sensing threshold, and/or increase the transmission power of transmission signals from the transmitting node (1 10).

The transmitting node (1 10) according to claim 7 or 8, wherein, when the timing condition indicates that the inference is received later than the reception of transmissions in the receiving node (121), the transmitting node (1 10) is configured to adjust one or more transmission parameters by initiate an Request-to-Transmit/Clear-to-Transmit, RTS/CTS, procedure in the wireless

communications network (100), and/or increase the transmission power of transmission signals from the transmitting node (1 10).

10. The transmitting node (1 10) according to any of claims 7-9, wherein, when the timing condition indicates that the inference is received at the same time as the reception of the transmission signal in the receiving node (121), the transmitting node (1 10) is configured to adjust one or more transmission parameters by increasing a contention window size in the transmitting node (1 10).

1 1. A method performed by an interfering node (11 1) for reducing interference in a wireless communications network (100), the method comprising

receiving (301) information indicating that inference caused by the interfering node (1 11) to a transmission signal from a transmitting node (110) fulfills a timing condition relative to the reception of the transmission signal in a receiving node (121) in the wireless communications network (100); and

adjusting (302) one or more transmission parameters in the interfering node (1 1 1) based on the received information.

12. The method according to claim 11 , wherein the timing condition is that the

inference is received earlier than the reception of the transmission signal in the receiving node (121), or that the inference is received at the same time as the reception of the transmission signal in the receiving node (121), or that the inference is received later than the reception of the transmission signal in the receiving node (121).

13. The method according to claim 12, wherein, when the timing condition indicates that the inference is received earlier than the transmission signal in the receiving node (121), the adjusting (302) comprises:

- initiating an Request-to-Transmit/Clear-to-Transmit, RTS/CTS, procedure in the wireless communications network (100), and/or

- decreasing the transmission power of transmission signals from the interfering node (11 1).

14. The method according to claim 12 or 13, wherein, when the timing condition

indicates that the inference is received later than the reception of transmissions in the receiving node (121), the adjusting (302) comprises:

- decreasing a channel sensing threshold, and/or

- decreasing the transmission power of transmission signals from the interfering node (1 11).

15. The method according to any of claims 12-14, wherein, when the timing condition indicates that the inference is received at the same time as the reception of the transmission signal in the receiving node (121), the adjusting (202) comprises increasing a contention window size in the interfering node (1 11).

16. An interfering node (11 1) for reducing interference in a wireless communications network (100), the interfering node (1 11) is configured to

receive information indicating that inference caused by the interfering node (1 11) to a transmission signal from a transmitting node (1 10) fulfills a timing condition relative to the reception of the transmission signal in a receiving node (121) in the wireless communications network (100), and adjust one or more transmission parameters in the interfering node (1 11) based on the received information.

17. The interfering node (1 11) according to claim 16, wherein the timing condition is that the inference is received earlier than the reception of the transmission signal in the receiving node (121), or that the inference is received at the same time as the reception of the transmission signal in the receiving node (121), or that the inference is received later than the reception of the transmission signal in the receiving node (121).

18. The interfering node (1 11) according to claim 17, wherein, when the timing

condition indicates that the inference is received earlier than the transmission signal in the receiving node (121), the interfering node (1 11) is configured to adjust one or more transmission parameters by initiating an Request-to- Transmit/Clear-to-Transmit, RTS/CTS, procedure in the wireless communications network (100), and/or decreasing the transmission power of transmission signals from the interfering node (1 11).

19. The interfering node (1 11) according to claim 17 or 18, wherein, when the timing condition indicates that the inference is received later than the reception of transmissions in the receiving node (121), the interfering node (1 1 1) is configured to adjust one or more transmission parameters by decreasing a channel sensing threshold, and/or decreasing the transmission power of transmission signals from the interfering node (1 11).

20. The interfering node (1 11) according to any of claims 17-19, wherein, when the timing condition indicates that the inference is received at the same time as the reception of the transmission signal in the receiving node (121), the interfering node (1 11) is configured to adjust one or more transmission parameters by increasing a contention window size in the interfering node (11 1).

21. A method performed by a receiving node (121) for reducing interference in a wireless communications network (100), the method comprising

determining (301) information indicating that inference caused by an interfering node (1 1 1) to a transmission signal from a transmitting node (110) fulfills a timing condition relative to the reception of the transmission signal in the receiving node (121); and

transmitting (302) the determined information to the interfering node (1 11) and/or to the transmitting node (1 10).

22. The method according to claim 21 , wherein the timing condition is that the

inference is received earlier than the reception of the transmission signal in the receiving node (121), or that the inference is received at the same time as the reception of the transmission signal in the receiving node (121), or that the inference is received later than the reception of the transmission signal in the receiving node (121).

23. The method according to claim 22, wherein the timing condition that the inference is received earlier than the reception of the transmission signal in the receiving node (121) is deemed to be fulfilled when most data units of the transmission signal have at least their first data payload unit occurring after its preamble decoded incorrectly, while also having at least their last data payload unit occurring after its preamble decoded correctly.

24. The method according to claim 22 or 23, wherein the timing condition that the inference is received later than the reception of the transmission signal in the

receiving node (121) is deemed to be fulfilled when most data units of the transmission signal have at least their first data payload unit occurring after its preamble decoded correctly, while also having at least their last data payload unit occurring after its preamble decoded incorrectly.

25. The method according to any of claims 22-24, wherein the timing condition that the inference is received at the same time as the reception of transmission signal in the receiving node (121) is deemed to be fulfilled when most data units of the transmission signal have at least their first data payload unit occurring after its preamble decoded incorrectly, while a received signal strength of the transmission signal is above a determined threshold.

26. The method according to any of claims 23-25, wherein the data units of the

transmission signal are WLAN PLCP packet data units, WLAN PPDUs, and the data payload units are aggregated MAC protocol data units, AMPDUs.

27. The method according to any of claims 21-26, wherein the wireless

communications network (100) operates in an unlicensed spectrum.

28. A receiving node (121) for reducing interference in a wireless communications network (100), the receiving node (121) is configured to

determine information indicating that inference caused by an interfering node (1 11) to a transmission signal from a transmitting node (1 10) fulfills a timing condition relative to the reception of the transmission signal in the receiving node (121), and transmit the determined information to the interfering node (11 1) and/or to the transmitting node (1 10).

29. The receiving node (121) according to claim 28, wherein the timing condition is that the inference is received earlier than the reception of the transmission signal in the receiving node (121), or that the inference is received at the same time as the reception of the transmission signal in the receiving node (121), or that the inference is received later than the reception of the transmission signal in the receiving node (121).

30. The receiving node (121) according to claim 29, wherein the timing condition that the inference is received earlier than the reception of the transmission signal in the receiving node (121) is deemed to be fulfilled when most data units of the transmission signal have at least their first data payload unit occurring after its preamble decoded incorrectly, while also having at least their last data payload unit occurring after its preamble decoded correctly.

31. The receiving node (121) according to claim 29 or 30, wherein the timing

condition that the inference is received later than the reception of the transmission signal in the receiving node (121) is deemed to be fulfilled when most data units of the transmission signal have at least their first data payload unit occurring after its preamble decoded correctly, while also having at least their last data payload unit occurring after its preamble decoded incorrectly.

32. The receiving node (121) according to any of claims 29-31 , wherein the timing condition that the inference is received at the same time as the reception of transmission signal in the receiving node (121) is deemed to be fulfilled when most data units of the transmission signal have at least their first data payload unit occurring after its preamble decoded incorrectly, while a received signal strength of the transmission signal is above a determined threshold.

33. The method according to any of claims 30-32, wherein the data units of the

transmission signal are WLAN PLCP packet data units, WLAN PPDUs, and the data payload units are aggregated MAC protocol data units, AMPDUs.

34. The method according to any of claims 28-33, wherein the wireless

communications network (100) operates in an unlicensed spectrum.

35. A computer program product, comprising instructions which, when executed on at least one processor (610, 710, 810), cause the at least one processor (610, 710, 810) to carry out the method according to any of claims 1-5, 11-15 or 21-27.

36. A carrier containing the computer program product according to claim 35, wherein the carrier is one of an electronic signal, optical signal, radio signal, or computer- readable storage medium.