Techniques for communicating on an uplink in a shared radio frequency spectrum band

Patent metadata

Field	Value
Publication number	US-2020196307-A1
Application number	US-202016796305-A
Country	US
Kind code	A1
Filing date	Feb 20, 2020
Priority date	Jul 21, 2016
Publication date	Jun 18, 2020
Grant date	—

Abstract

Techniques are described for wireless communication. One method includes detecting a first reference signal received from a user equipment (UE) in a reference scheduled transmission burst including a plurality of contiguous transmission time intervals (TTIs) received over a shared radio frequency spectrum band; identifying a reference TTI in which the first reference signal is received; determining a contention window size usable by the UE to contend for access to the shared radio frequency spectrum band; and transmitting an indication of the determined contention window size to the UE.

First claim

What is claimed is:

1 . A method for wireless communication at a user equipment (UE), comprising:
receiving a first uplink grant for a reference scheduled transmission burst including a plurality of contiguous transmission time intervals (TTIs) transmitted over a shared radio frequency spectrum band, wherein the first uplink grant indicates: that the first uplink grant is associated with a first scheduled TTI of the reference scheduled transmission burst, a position of the first scheduled TTI within the reference scheduled transmission burst, or a combination thereof; transmitting during at least one TTI of the reference scheduled transmission burst, in accordance with the first uplink grant, the transmitting beginning during a first transmission TTI; determining a reference TTI, the reference TTI being used for transmission by the UE during the reference scheduled transmission burst; and determining a contention window size usable by the UE to contend for access to the shared radio frequency spectrum band, the determining based at least in part on a relationship between the first scheduled TTI, the reference TTI, and the first transmission TTI.

2 . The method of claim 1 , wherein the first uplink grant for the reference scheduled transmission burst indicates the position of the first scheduled TTI of the reference scheduled transmission burst.

3 . The method of claim 1 , wherein the reference TTI is relative to the first scheduled TTI.

4 . The method of claim 1 , wherein the relationship includes the first transmission TTI being earlier than the reference TTI, the first transmission TTI being later than the reference TTI, or the first transmission TTI being the same as the reference TTI.

5 . An apparatus for wireless communication at a user equipment (UE), comprising:
a processor; memory in electronic communication with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to:
receive a first uplink grant for a reference scheduled transmission burst including a plurality of contiguous transmission time intervals (TTIs) transmitted over a shared radio frequency spectrum band, wherein the first uplink grant indicates: that the first uplink grant is associated with a first scheduled TTI of the reference scheduled transmission burst, a position of the first scheduled TTI within the reference scheduled transmission burst, or a combination thereof;
transmit during at least one TTI of the reference scheduled transmission burst, in accordance with the first uplink grant, the transmitting beginning during a first transmission TTI;
determine a reference TTI, the reference TTI being used for transmission by the UE during the reference scheduled transmission burst; and
determine a contention window size usable by the UE to contend for access to the shared radio frequency spectrum band, the determining based at least in part on a relationship between the first scheduled TTI, the reference TTI, and the first transmission TTI.

6 . The apparatus of claim 5 , wherein the first uplink grant for the reference scheduled transmission burst comprises an indication of the position of the first scheduled TTI of the reference scheduled transmission burst.

7 . The apparatus of claim 5 , wherein the the reference TTI is relative to the first scheduled TTI.

8 . The apparatus of claim 5 , wherein the relationship includes the first transmission TTI being earlier than the reference TTI, the first transmission TTI being later than the reference TTI, or the first transmission TTI being the same as the reference TTI.

9 . An apparatus for wireless communication at a user equipment (UE), comprising:
means for receiving a first uplink grant for a reference scheduled transmission burst including a plurality of contiguous transmission time intervals (TTIs) transmitted over a shared radio frequency spectrum band, wherein the first uplink grant indicates: that the first uplink grant is associated with a first scheduled TTI of the reference scheduled transmission burst, a position of the first scheduled TTI within the reference scheduled transmission burst, or a combination thereof; means for transmitting during at least one TTI of the reference scheduled transmission burst, in accordance with the first uplink grant, the transmitting beginning during a first transmission TTI; means for determining a reference TTI, the reference TTI being used for transmission by the UE during the reference scheduled transmission burst; and means for determining a contention window size usable by the UE to contend for access to the shared radio frequency spectrum band, the determining based at least in part on a relationship between the first scheduled TTI, the reference TTI, and the first transmission TTI.

10 . The apparatus of claim 9 , wherein the first uplink grant for the reference scheduled transmission burst comprises an indication of the position of the first scheduled TTI of the reference scheduled transmission burst.

11 . The apparatus of claim 9 , wherein the reference TTI is relative to the first scheduled TTI.

12 . The apparatus of claim 9 , wherein the relationship includes the first transmission TTI being earlier than the reference TTI, the first transmission TTI being later than the reference TTI, or the first transmission TTI being the same as the reference TTI.

13 . A non-transitory computer-readable medium storing code for wireless communication at a user equipment (UE), the code comprising instructions executable by a processor to:
receive a first uplink grant for a reference scheduled transmission burst including a plurality of contiguous transmission time intervals (TTIs) transmitted over a shared radio frequency spectrum band, wherein the first uplink grant indicates: that the first uplink grant is associated with a first scheduled TTI of the reference scheduled transmission burst, a position of the first scheduled TTI within the reference scheduled transmission burst, or a combination thereof; transmit during at least one TTI of the reference scheduled transmission burst, in accordance with the first uplink grant, the transmitting beginning during a first transmission TTI; determine a reference TTI, the reference TTI being used for transmission by the UE during the reference scheduled transmission burst; and determine a contention window size usable by the UE to contend for access to the shared radio frequency spectrum band, the determining based at least in part on a relationship between the first scheduled TTI, the reference TTI, and the first transmission TTI.

14 . The non-transitory computer-readable medium of claim 13 , wherein the first uplink grant for the reference scheduled transmission burst comprises an indication of the position of the first scheduled TTI of the reference scheduled transmission burst.

15 . The non-transitory computer-readable medium of claim 13 , wherein the reference TTI is relative to the first scheduled TTI.

16 . The non-transitory computer-readable medium of claim 13 , wherein the relationship includes the first transmission TTI being earlier than the reference TTI, the first transmission TTI being later than the reference TTI, or the first transmission TTI being the same as the reference TTI.

Assignees

• Qualcomm Inc

Inventors

• Yerramalli Srinivas
• Gaal Peter
• Montojo Juan
• Luo Tao
• Chen Wanshi

Classifications

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W72/21

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04W72/54

  based on quality criteria · CPC title

• H04W74/085

  collision avoidance · CPC title

• H04W74/006

  in the downlink, i.e. towards the terminal · CPC title