Techniques for assisting performance of listen before talk procedures and uplink traffic multiplexing at user equipment

Patent metadata

Field	Value
Publication number	US-10764913-B2
Application number	US-201715467379-A
Country	US
Kind code	B2
Filing date	Mar 23, 2017
Priority date	Mar 24, 2016
Publication date	Sep 1, 2020
Grant date	Sep 1, 2020

Abstract

Techniques are described for wireless communication. One method for wireless communication at a user equipment (UE) includes receiving, over the air, information indicative of at least one type of LBT procedure to perform for an uplink transmission; identifying, from the received information, the at least one type of LBT procedure to perform for the uplink transmission; and performing, for a shared spectrum, the at least one type of LBT procedure for the uplink transmission. One method for wireless communication at a network access device includes scheduling an uplink transmission of a UE in a shared spectrum, and transmitting, over the air, information indicative of at least one type of LBT procedure to perform for the uplink transmission.

First claim

What is claimed is:

1. A method for wireless communication at a user equipment (UE), comprising:
receiving, over the air, in an uplink grant for an uplink transmission, information indicative of one of multiple types of Listen Before Talk (LBT) procedures, each of the multiple types of LBT procedures being associated with the uplink transmission, and wherein the information indicative of the one of multiple types of LBT procedures comprises at least one bit received in the uplink grant;
identifying, from the received information, the indicated type of LBT procedure to perform for the uplink transmission; and
performing, for a shared spectrum, the indicated type of LBT procedure for the uplink transmission.

2. The method of claim 1 , wherein the information indicative of the one of multiple types of LBT procedures, each of the multiple types of LBT procedures being associated with the uplink transmission, indicates at least one of:
whether a duration of the uplink transmission is within a maximum channel occupancy time for which the shared spectrum is reserved by a network access device, or a type of LBT procedure to perform prior to transmitting the uplink transmission, or a combination thereof.

3. The method of claim 1 , wherein the information indicative of the one of multiple types of LBT procedures, each of the multiple types of LBT procedures being associated with the uplink transmission, indicates a duration of a portion of a maximum channel occupancy time for which the shared spectrum is reserved by a network access device and available for uplink transmissions.

4. The method of claim 3 , further comprising:
receiving a common physical downlink control channel (PDCCH);
wherein the information indicative of the one of multiple types of LBT procedures, each of the multiple types of LBT procedures being associated with the uplink transmission, is signaled in the common PDCCH.

5. The method of claim 3 , wherein the indicated type of LBT procedure to perform for the uplink transmission is identified based at least in part on the duration of the portion of the maximum channel occupancy time for which the shared spectrum is reserved by the network access device and available for uplink transmissions and a duration of the uplink transmission.

6. The method of claim 1 , further comprising:
receiving at least one indication of at least one LBT priority class including: a first LBT priority class used by a network access device when performing a LBT procedure to contend for access to the shared spectrum, or a second LBT priority class to be used for performing a type of LBT procedure for the uplink transmission when contention for access to the shared spectrum by the network access device is unsuccessful, or a combination thereof.

7. The method of claim 6 , wherein the first LBT priority class is associated with the network access device performing a LBT procedure to contend for access to:
at least a first carrier of the shared spectrum on which the uplink transmission is scheduled, or at least a second carrier of the shared spectrum used to cross-carrier schedule the uplink transmission.

8. The method of claim 6 ,
wherein the at least one indication of the at least one LBT priority class is received in the uplink grant.

9. The method of claim 6 , further comprising:
determining whether the network access device successfully contended for access to the shared spectrum; and
determining whether to perform a LBT procedure for the uplink transmission based at least in part on the first LBT priority class or the second LBT priority class, based at least in part on determining whether the network access device successfully contended for access to the shared spectrum.

10. The method of claim 6 , further comprising:
identifying a LBT priority class in the at least one LBT priority class for performing a LBT procedure for the uplink transmission;
selecting data for transmission during the uplink transmission based at least in part on the identified LBT priority class; and
transmitting the selected data during the uplink transmission.

11. The method of claim 1 , further comprising:
receiving at least one indication of a contention window size to use for at least one LBT priority class;
selecting a LBT priority class for performing a LBT procedure for the shared spectrum; and
sizing a contention window for the LBT procedure based at least in part on an indication of a contention window size corresponding to the selected LBT priority class.

12. The method of claim 11 , wherein the at least one indication of a contention window size to use for at least one LBT priority class comprises a ratio of contention window sizes for each LBT priority class of the at least one LBT priority class.

13. The method of claim 12 , wherein each ratio of contention window sizes comprises a ratio of a contention window size for a LBT priority class and a default contention window size.

14. The method of claim 11 ,
wherein the at least one indication of a contention window size to use for at least one LBT priority class is received in the uplink grant.

15. The method of claim 1 , further comprising:
receiving an indication of a type of multi-carrier LBT procedure to perform for the uplink transmission.

16. The method of claim 15 , wherein the type of multi-carrier LBT procedure to perform comprises:
a type of LBT procedure performed for a UE-selected primary carrier in the shared spectrum, or a type of LBT procedure performed for a physical uplink control channel (PUCCH) carrier in the shared spectrum, or a type of LBT procedure performed for a UE-selected carrier in the shared spectrum, or a type of LBT procedure performed for a network access device-selected carrier in the shared spectrum, or a type of LBT procedure performed for multiple carriers in the shared spectrum.

17. The method of claim 15 , wherein the indication of the type of multi-carrier LBT procedure to perform is received in radio resource control (RRC) signaling.

18. An apparatus for wireless communication at a user equipment (UE), comprising:
means for receiving, over the air, in an uplink grant for an uplink transmission, information indicative of one of multiple types of Listen Before Talk (LBT) procedures, each of the multiple types of LBT procedures being associated with the uplink transmission, and wherein the information indicative of the one of multiple types of LBT procedures comprises at least one bit received in the uplink grant;
means for identifying, from the received information, the indicated type of LBT procedure to perform for the uplink transmission; and
means for performing, for a shared spectrum, the indicated type of LBT procedure for the uplink transmission.

19. The apparatus of claim 18 , wherein the information indicative of the one of multiple types of LBT procedures, each of the multiple types of LBT procedures being associated with the uplink transmission, indicates at least one of:
whether a duration of the uplink transmission is within a maximum channel occupancy time for which the shared spectrum is reserved by a network access device, or a type of LBT procedure to perform prior to transmitting the uplink transmission, or a combination thereof.

20. The apparatus of claim 18 , wherein the information indicative of the one of multiple types of LBT procedures, each of the multiple types of LBT procedures being associated with the uplink transmission, indicates a duration of a portion of a maximum channel occupancy time for whi

Assignees

• Qualcomm Inc

Inventors

• Yerramalli Srinivas
• Damnjanovic Aleksandar
• Gaal Peter
• Montojo Juan

Classifications

• H04W72/56

  based on priority criteria · CPC title

• H04W72/23

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

• H04L5/001

  the frequencies being arranged in component carriers · CPC title

• H04W74/006

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

• H04W74/0808 Primary

  using carrier sensing, e.g. carrier sense multiple access [CSMA] · CPC title