SIMULTANEOUS RECEPTION SWEEP AND TRANSMISSION IN A FULL-DUPLEX NODE

• US 20180317259A1
• Filed: 04/10/2018
• Published: 11/01/2018
• Est. Priority Date: 05/01/2017
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Islam, Muhammad Nazmul, Li, Junyi, Subramanian, Sundar, Kadous, Tamer
• Granted Patent: US 10,595,342 B2
• Time in Patent Office: Days
• CPC Class Codes: H04W 74/0816 with collision avoidance

Abstract

Methods, systems, and devices for wireless communication are described. A wireless node may transmit directional signals in a sweeping transmission pattern while receiving communications from a second wireless node. Another wireless node may then, during a listen-before-talk (LBT) procedure, receive one of the directional signals, and terminate a correspondence communication session to avoid potential interference. Additionally or alternatively, a wireless node may listen in directions in a sweeping receive pattern while transmitting to a second wireless node. While listening, the wireless node may detect a transmission from a third wireless node in a particular direction. The wireless node may then accordingly refrain from transmitting in that direction to avoid potential interference.

Claims

1. A method for wireless communication at a first wireless node, comprising:

selecting a plurality of reception directions for a sweeping receive pattern based at least in part on prior signaling transmitted by one or more additional wireless nodes;

transmitting a first message to a second wireless node; and

listening, while concurrently transmitting the first message and in accordance with the sweeping receive pattern, for one or more signals from the one or more additional wireless nodes in a corresponding direction.

2. The method of claim 1, wherein the first wireless node supports full-duplex communications.

3. The method of claim 1, wherein the first wireless node transmits the first message and receives the one or more signals in a same radio frequency band.

4. The method of claim 1, wherein listening for the one or more signals comprises:

listening for one or more request-to-send (RTS) and clear-to-send (CTS) signals from the one or more additional wireless nodes.

5. The method of claim 1, further comprising:

determining that a request-to-send (RTS) or clear-to-send (CTS) is being transmitted by at least one of the one or more additional wireless nodes; and

refraining from transmitting a second message in a direction corresponding to the at least one of the one or more additional wireless nodes based at least in part on the determination.

6. The method of claim 1, further comprising:

determining respective locations of the one or more additional wireless nodes based on the prior signaling.

7. The method of claim 1, further comprising:

receiving an indication of respective locations of the one or more additional wireless nodes, wherein selecting the plurality of reception directions is based at least in part on the indication.

8. The method of claim 1, wherein listening for the one or more signals comprises:

listening in a plurality of reception directions during respective time intervals; and

receiving the one or more signals during the respective time intervals.

9. The method of claim 1, further comprising:

receiving, from the one or more additional wireless nodes, an indication of a transmission configuration indicator (TCI) for at least one reference signal transmitted by the one or more additional wireless nodes, wherein selecting a plurality of reception directions is based at least in part on the indication.

10. The method of claim 1, further comprising:

receiving, prior to listening for the one or more signals from the one or more additional wireless nodes, a sequence or a message transmitted by the one or more additional wireless nodes.

11. The method of claim 10, wherein the sequence or the message conveys at least a cell identity of the one or more additional wireless nodes, a timing reference of the one or more additional wireless nodes, or any combination thereof.

12. The method of claim 1, wherein the sweeping receive pattern comprises a plurality of receive directions having a predefined angular separation between each of the plurality of receive directions.

13. The method of claim 12, wherein the plurality of receive directions are different than a direction corresponding to transmission of the first message to the second wireless node.

14. An apparatus for wireless communication a first wireless node, comprising:

means for selecting a plurality of reception directions for a sweeping receive pattern based at least in part on prior signaling transmitted by one or more additional wireless nodes;

means for transmitting a first message to a second wireless node; and

means for listening, while concurrently transmitting the first message and in accordance with the sweeping receive pattern, for one or more signals from the one or more additional wireless nodes in a corresponding direction.

15. The apparatus of claim 14, further comprising:

means for performing full-duplex communications.

16. The apparatus of claim 14, further comprising:

means for transmitting the first message and receiving the one or more signals in a same radio frequency band.

17. The apparatus of claim 14, wherein listening for the one or more signals comprises:

listening for one or more request-to-send (RTS) and clear-to-send (CTS) signals from the one or more additional wireless nodes.

18. The apparatus of claim 14, further comprising:

means for determining that a request-to-send (RTS) or clear-to-send (CTS) is being transmitted by at least one of the one or more additional wireless nodes; and

means for refraining from transmitting a second message in a direction corresponding to the at least one of the one or more additional wireless nodes based at least in part on the determination.

19. An apparatus for wireless communication a first wireless node, comprising:

a processor;

memory in electronic communication with the processor; and

instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to;

select a plurality of reception directions for a sweeping receive pattern based at least in part on prior signaling transmitted by one or more additional wireless nodes;

transmit a first message to a second wireless node; and

listen, while concurrently transmitting the first message and in accordance with the sweeping receive pattern, for one or more signals from the one or more additional wireless nodes in a corresponding direction.

20. The apparatus of claim 19, wherein the instructions are executable by the processor to:

perform full-duplex communications.

21. The apparatus of claim 19, wherein the instructions are executable by the processor to:

transmit the first message and receive the one or more signals in a same radio frequency band.

22. The apparatus of claim 19, wherein the instructions executable by the processor to cause the apparatus to listen for the one or more signals comprise instructions executable by the processor to cause the apparatus to:

listen for one or more request-to-send (RTS) and clear-to-send (CTS) signals from the one or more additional wireless nodes.

23. The apparatus of claim 19, wherein the instructions are executable by the processor to:

determine that a request-to-send (RTS) or clear-to-send (CTS) is being transmitted by at least one of the one or more additional wireless nodes; and

refrain from transmitting a second message in a direction corresponding to the at least one of the one or more additional wireless nodes based at least in part on the determination.

24. The apparatus of claim 19, wherein the instructions are executable by the processor to:

determine respective locations of the one or more additional wireless nodes based on the prior signaling.

25. The apparatus of claim 19, wherein the instructions are executable by the processor to:

receive an indication of respective locations of the one or more additional wireless nodes, wherein selecting the plurality of reception directions is based at least in part on the indication.

26. The apparatus of claim 19, wherein the instructions executable by the processor to cause the apparatus to listen for the one or more signals comprise instructions executable by the processor to cause the apparatus to:

listen in a plurality of reception directions during respective time intervals; and

receive the one or more signals during the respective time intervals.

27. The apparatus of claim 19, wherein the instructions are executable by the processor to:

receive, from the one or more additional wireless nodes, an indication of a transmission configuration indicator (TCI) for at least one reference signal transmitted by the one or more additional wireless nodes, wherein selecting a plurality of reception directions is based at least in part on the indication.

28. The apparatus of claim 19, wherein the instructions are executable by the processor to:

receive, prior to listening for the one or more signals from the one or more additional wireless nodes, a sequence or a message transmitted by the one or more additional wireless nodes, wherein the sequence or the message conveys at least a cell identity of the one or more additional wireless nodes, a timing reference of the one or more additional wireless nodes, or any combination thereof.

29. The apparatus of claim 19, wherein the sweeping receive pattern comprises a plurality of receive directions having a predefined angular separation between each of the plurality of receive directions.

30. A non-transitory computer readable medium storing code for wireless communication a first wireless node, the code comprising instructions executable by a processor to:

select a plurality of reception directions for a sweeping receive pattern based at least in part on prior signaling transmitted by one or more additional wireless nodes;

transmit a first message to a second wireless node; and

listen, while concurrently transmitting the first message and in accordance with the sweeping receive pattern, for one or more signals from the one or more additional wireless nodes in a corresponding direction.