BLIND DETECTION AND REPORTING OF INTERFERENCE IN UNLICENSED SPECTRUM

• US 20170094672A1
• Filed: 09/23/2016
• Published: 03/30/2017
• Est. Priority Date: 09/25/2015
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: LEI, Jing, YERRAMALLI, Srinivas, CHENDAMARAI KANNAN, Arumugam, RAMANUJAM, Sridhar, WEI, Yongbin
• Granted Patent: US 10,531,473 B2
• Time in Patent Office: 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 43/16 Threshold monitoring
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 28/0236 radio quality, e.g. interference, losses or delay
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

The disclosure provides for detecting interference in wireless communications. A wireless devices may receive an interfering signal on a portion of unlicensed spectrum. The wireless device may perform cyclic autocorrelation on the interfering signal to determine one or both of a cyclic prefix length and a symbol period. The wireless device may determine a radio access technology of the interfering signal based on one or both of the cyclic prefix length and the symbol period. In an aspect, the wireless device may further transmit an interference report including information regarding the interfering signal including the cyclic prefix length, symbol period, identified radio access technology, or packet length.

Claims

1. A method of detecting interference in wireless communications, comprising:

receiving, by a receiver, an interfering signal on a portion of unlicensed spectrum;

performing, by a processor, cyclic autocorrelation on the interfering signal to determine one or both of a cyclic prefix length and a symbol period; and

determining, by the processor, a radio access technology of the interfering signal based on one or both of the cyclic prefix length and the symbol period.

2. The method of claim 1, further comprising adjusting an energy detection threshold based on the radio access technology.

3. The method of claim 1, further comprising transmitting, from a user equipment (UE), an interference report to a base station, the interference report including the one or both of the cyclic prefix length and the symbol period.

4. The method of claim 3, wherein the interference report further includes channels on which the interfering signal was detected or a duration of a packet on the interfering signal.

5. The method of claim 3, wherein the interference report is one of:

an interference report requested by the base station, an interference report periodically transmitted by the UE, or an interference report transmitted based on an event detected by the UE.

6. The method of claim 5, wherein the event detected by the UE is one of detecting the interfering signal from the radio access technology for a threshold amount of time, determining that the radio access technology of the interfering signal has not been recently detected, or determining that a radio access technology of a previously detected interfering signal has not been recently detected.

7. The method of claim 3, wherein the interference report further includes a received signal strength indicator (RSSI) associated with the interfering signal.

8. The method of claim 7, further comprising switching from a first window adaptation technique to a different second window adaptation technique based on the RSSI associated with the interfering signal and a duration of a transmission opportunity (TXOP) of the interfering signal.

9. The method of claim 1, further comprising adjusting a contention window size for channel access based on the radio access technology.

10. The method of claim 9, wherein the contention window size for channel access on a first channel is dependent on detection of the radio access technology on a different channel.

11. The method of claim 1, further comprising adjusting a transmission opportunity (TXOP) duration based on a duration of a TXOP of the interfering signal.

12. The method of claim 11, wherein the duration of the TXOP of the interfering signal is detected at a base station or reported by one or more UEs.

13. The method of claim 3, wherein the interference report indicates a transmission direction of the interfering signal.

14. The method of claim 3, wherein the interference report indicates multiple cyclic prefix and symbol period combinations for a channel over a period of time.

15. An apparatus for detecting interference in wireless communications, comprising:

a transceiver configured to receive an interfering signal on a portion of unlicensed spectrum;

a memory; and

a processor communicatively coupled to the transceiver and the memory, the processor and the memory configured to;

perform cyclic autocorrelation on the interfering signal to determine one or both of a cyclic prefix length and a symbol period; and

determine a radio access technology of the interfering signal based on one or both of the cyclic prefix length and the symbol period.

16. The apparatus of claim 15, wherein the processor and the memory are configured to adjust an energy detection threshold based on the radio access technology.

17. The apparatus of claim 15, wherein the apparatus is a user equipment (UE), and wherein the processor and the memory are configured to transmit, from the UE, an interference report to a base station, the interference report including the one or both of the cyclic prefix length and the symbol period.

18. The apparatus of claim 17, wherein the interference report further includes channels on which the interfering signal was detected or a duration of a packet on the interfering signal.

19. The apparatus of claim 17, wherein the interference report is one of:

an interference report requested by the base station, an interference report periodically transmitted by the UE, or an interference report transmitted based on an event detected by the UE.

20. The apparatus of claim 19, wherein the event detected by the UE is one of detecting the interfering signal from the radio access technology for a threshold amount of time, determining that the radio access technology of the interfering signal has not been recently detected, or determining that a radio access technology of a previously detected interfering signal has not been recently detected.

21. The apparatus of claim 17, wherein the interference report further includes a received signal strength indicator (RS SI) associated with the interfering signal.

22. The apparatus of claim 15, wherein the processor and the memory are configured to switch from a first window adaptation technique to a different second window adaptation technique based on a received signal strength indicator (RSSI) associated with the interfering signal and a duration of a transmission opportunity (TXOP) of the interfering signal.

23. The apparatus of claim 15, wherein the processor and the memory are configured to adjust a contention window size for channel access based on the radio access technology.

24. The apparatus of claim 23, wherein the contention window size for channel access on a first channel is dependent on detection of the radio access technology on a different channel.

25. The apparatus of claim 15, wherein the processor and the memory are configured to adjust a transmission opportunity (TXOP) duration based on a duration of a TXOP of the interfering signal.

26. The apparatus of claim 25, wherein the processor and the memory are configured to detect the duration of the TXOP of the interfering signal.

27. An apparatus for detecting interference in wireless communications, comprising:

means for receiving an interfering signal on a portion of unlicensed spectrum;

means for performing cyclic autocorrelation on the interfering signal to determine one or both of a cyclic prefix length and a symbol period; and

means for determining a radio access technology of the interfering signal based on one or both of the cyclic prefix length and the symbol period.

28. The apparatus of claim 27, further comprising means for adjusting an energy detection threshold based on the radio access technology.

29. The apparatus of claim 27, further comprising means for transmitting an interference report to a base station, the interference report including the one or both of the cyclic prefix length and the symbol period.

30. A computer-readable medium storing computer executable code for detecting interference in wireless communications, comprising code to:

receive an interfering signal on a portion of unlicensed spectrum;

perform cyclic autocorrelation on the interfering signal to determine one or both of a cyclic prefix length and a symbol period; and

determine a radio access technology of the interfering signal based on one or both of the cyclic prefix length and the symbol period.