LISTEN BEFORE TALK DESIGN FOR SPECTRUM SHARING IN NEW RADIO (NR)

• US 20180063799A1
• Filed: 03/15/2017
• Published: 03/01/2018
• Est. Priority Date: 09/01/2016
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Sadek, Ahmed Kamel, Bhushan, Naga, Black, Peter, Fan, Michael Mingxi, Wei, Yongbin
• Granted Patent: US 10,582,458 B2
• Time in Patent Office: Days
• CPC Class Codes: H04W 52/34 TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 72/56 based on priority criteria
• CPC Class Codes: H04W 74/002 Transmission of channel access control information
• CPC Class Codes: H04W 74/0808 using carrier sensing, e.g. carrier sense multiple access [CSMA]
• CPC Class Codes: H04W 74/0816 with collision avoidance

Abstract

Methods, systems, and devices for wireless communication are described. A wireless node may receive stress beacons on a channel. Each stress beacon may include an indication of an allowable interference level for a corresponding wireless node that transmitted the stress beacon on the channel. The wireless node may update a backoff window for the channel based on the allowable interference levels indicated in the stress beacons.

Claims

1. A method for wireless communication, comprising:

receiving one or more stress beacons on a channel, each of the one or more stress beacons comprising an indication of an attribute for a corresponding wireless node on the channel; and

updating a backoff window for the channel based at least in part on the attribute indicated by the respective one or more stress beacons.

2. The method of claim 1, further comprising:

updating the backoff window for the channel based at least in part on the one or more stress beacons.

3. The method of claim 1, further comprising:

updating the backoff window for the channel based at least in part on one or more of an acknowledgement/negative-acknowledgement (ACK/NACK) feedback message, a channel quality information (CQI) feedback message, a measurement report provided by a network listen module, or combinations thereof.

4. The method of claim 1, further comprising:

identifying a backoff transmit power level based at least in part on the attribute indicated by the respective one or more stress beacons; and

adjusting a transmit power based at least in part on the backoff transmit power level.

5. The method of claim 4, further comprising:

identifying a pathloss value associated with the respective one or more stress beacons; and

identifying the backoff transmit power level based at least in part on the pathloss value.

6. The method of claim 4, further comprising:

determining that the backoff transmit power level is above a threshold level; and

utilizing a time division multiplexing scheme for subsequent transmissions.

7. The method of claim 1, further comprising:

identifying a stress beacon count indicative of a number of the one or more stress beacons received on the channel; and

updating the backoff window based at least in part on the stress beacon count.

8. The method of claim 1, wherein

the attribute indicated by the one or more stress beacons are associated with one or more prior transmissions.

9. The method of claim 1, further comprising:

identifying a total network count associated with one or more detected networks; and

updating the backoff window based at least in part on the total network count.

10. The method of claim 1, further comprising:

receiving a subsequent stress beacon during a backoff window period;

pausing the backoff window;

updating the backoff window based at least in part on the indication in the subsequent stress beacon of the attribute for the corresponding wireless node; and

resuming the backoff window period according to the updated backoff window.

11. The method of claim 1, further comprising:

determining, based at least in part on the backoff window, whether to perform one or more of a power backoff operation, a transmission blanking procedure, or a beamforming transmission.

12. The method of claim 1, further comprising:

transmitting a trigger message to initiate receipt of the one or more stress beacons.

13. The method of claim 12, wherein

the trigger message comprises an enhanced request to send (eRTS) message.

14. The method of claim 1, wherein

the one or more stress beacons comprise an enhanced clear to send (eCTS) message.

15. The method of claim 1, wherein

the attribute comprises an allowable interference level for the corresponding wireless node.

16. A method for wireless communication, comprising:

maintaining a backoff window for each channel of a set of channels;

identifying a subset of channels from the set of channels, each channel of the subset of channels having a corresponding backoff window above a threshold level; and

deprioritizing the subset of channels such that each channel of the subset of channels is assigned a priority that is lower than channels having a corresponding backoff window below the threshold level.

17. The method of claim 16, further comprising:

updating the backoff window for each channel of the set of channels based at least in part on receiving one or more stress beacons on the channel.

18. The method of claim 16, further comprising:

updating the backoff window for each channel of the set of channels based at least in part on one or more of an acknowledgement/negative-acknowledgement (ACK/NACK) feedback message received on the channel, a channel quality information (CQI) feedback message received on the channel, a measurement report provided by a network listen module on the channel, or combinations thereof.

19. The method of claim 16, further comprising:

identifying a second subset of channels from the set of channels, each channel of the second subset of channels having a corresponding backoff window below a threshold level; and

transmitting at least one message on one or more channels of the second subset of channels.

20. The method of claim 16, further comprising:

determining that the subset of channels includes at least a predetermined number of channels;

selecting a random subset of channels of the set of channels; and

resetting, to a predetermined minimum value, the corresponding backoff windows for each of the random subset of channels.

21. The method of claim 20, further comprising:

selecting the random subset of channels of the set of channels based at least in part on an identity field.

22. A method for wireless communication, comprising:

determining whether an identified channel interference level is above a threshold;

configuring a stress beacon based at least in part on the determination of whether the identified channel interference level is above the threshold level, wherein the configured stress beacon comprises a duration field; and

transmitting the configured stress beacon, the stress beacon comprising an indication of an attribute.

23. The method of claim 22, wherein

determining whether the identified channel interference level is above the threshold comprises:

determining a signal to interference-plus-noise ratio (SINR) for a channel corresponding to the identified channel interference level; and

the method further comprising determining that the SINR for the channel is less than an SINR threshold.

24. The method of claim 22, further comprising:

receiving a trigger message from a transmitting node, the trigger message operative to trigger transmission of the stress beacon.

25. The method of claim 24, wherein

receiving the trigger message comprises:

receiving an enhanced request to send (eRTS) message.

26. The method of claim 22, wherein

configuring the stress beacon comprises:

configuring a reference signal to be transmitted at a predetermined power level.

27. The method of claim 22, further comprising:

selecting a value of the duration field to convey an indication of the attribute.

28. The method of claim 22, further comprising:

selecting a value of zero for the duration field to convey an indication that no transmission is allowed.

29. The method of claim 22, further comprising:

broadcasting the stress beacon.

30. An apparatus for wireless communication, comprising:

a processor;

memory in electronic communication with the processor; and

the processor and memory configured to;

receive one or more stress beacons on a channel, each of the one or more stress beacons comprising an indication of an attribute for a corresponding wireless node on the channel; and

update a backoff window for the channel based at least in part on the attribute indicated by the respective one or more stress beacons.