Transmission scheme for multiple component carriers in adjacent subframes

Patent metadata

Field	Value
Publication number	US-10869332-B2
Application number	US-201715648229-A
Country	US
Kind code	B2
Filing date	Jul 12, 2017
Priority date	Jul 12, 2017
Publication date	Dec 15, 2020
Grant date	Dec 15, 2020

Abstract

Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive a first grant to perform a first uplink transmission in a first subframe using a first component carrier. The UE may receive a second grant to perform a second uplink transmission in a second subframe adjacent the first subframe in time. The UE may determine to null one or more symbols of the uplink transmission in the first subframe based at least in part on the second grant. In some cases, the UE may determine to null the one or more symbols of the first uplink transmission is based at least in part on an availability of a single radio frequency (RF) frontend for use by the UE.

First claim

What is claimed is:

1. A method for wireless communication, comprising:
receiving, at a user equipment (UE), a first grant to perform a first uplink transmission in a first subframe using a first component carrier;
receiving, at the UE, a second grant to perform a second uplink transmission in a second subframe subsequent in time to the first subframe using a second component carrier;
determining, at the UE, that the second subframe is consecutive to the first subframe;
determining, at the UE, a number of radio frequency (RF) frontends available for use by the UE;
determining, at the UE, to null one or more symbols of the first uplink transmission in the first subframe based at least in part on the determination by the UE that the second subframe is consecutive to the first subframe and the determination by the UE of the number of RF frontends available for use by the UE; and
transitioning from a transmission mode using the first component carrier to a reception mode using the second component carrier during the nulled one or more symbols of the first uplink transmission.

2. The method of claim 1 , wherein determining to null the one or more symbols of the first uplink transmission is based at least in part on an availability of a single RF frontend for use by the UE.

3. The method of claim 1 , wherein:
the second component carrier is different from the first component carrier.

4. The method of claim 1 , further comprising:
identifying a modulation and coding scheme (MCS) of the first uplink transmission in the first subframe; and
determining a number of symbols to null based at least in part on the MCS of the first uplink transmission.

5. The method of claim 1 , further comprising:
determining a first duration for a listen-before-talk (LBT) procedure of the second component carrier during the first subframe; and
determining a second duration to switch from a first communication mode to a second communication mode during the first subframe, wherein the one or more symbols to null are determined based at least in part on the first and second durations.

6. The method of claim 5 , further comprising:
performing, during the first duration and prior to a beginning of the second subframe, the LBT procedure of the second component carrier.

7. The method of claim 1 , wherein:
the first grant is a licensed assisted access (LAA) grant for the first component carrier.

8. An apparatus for wireless communication, comprising:
means for receiving, at a user equipment (UE), a first grant to perform a first uplink transmission in a first subframe using a first component carrier;
means for receiving, at the UE, a second grant to perform a second uplink transmission in a second subframe subsequent in time to the first subframe using a second component carrier;
means for determining, at the UE, that the second subframe is consecutive to the first subframe;
determining, at the UE, a number of radio frequency (RF) frontends available for use by the UE;
means for determining, at the UE, to null one or more symbols of the first uplink transmission in the first subframe based at least in part on the determination by the UE that the second subframe is consecutive to the first subframe and the determination by the UE of the number of RF frontends available for use by the UE; and
transitioning from a transmission mode using the first component carrier to a reception mode using the second component carrier during the nulled one or more symbols of the first uplink transmission.

9. The apparatus of claim 8 , wherein the means for determining to null the one or more symbols of the first uplink transmission is based at least in part on an availability of a single RF frontend for use by the UE.

10. The apparatus of claim 8 , wherein:
the second component carrier is different from the first component carrier.

11. The apparatus of claim 8 , further comprising:
means for identifying a modulation and coding scheme (MCS) of the first uplink transmission in the first subframe; and
means for determining a number of symbols to null based at least in part on the MCS of the first uplink transmission.

12. The apparatus of claim 8 , further comprising:
means for determining a first duration for a listen-before-talk (LBT) procedure of the second component carrier during the first subframe; and
means for determining a second duration to switch from a first communication mode to a second communication mode during the first subframe, wherein the one or more symbols to null are determined based at least in part on the first and second durations.

13. The apparatus of claim 12 , further comprising:
means for performing, during the first duration and prior to a beginning of the second subframe, the LBT procedure of the second component carrier.

14. The apparatus of claim 8 , wherein:
the first grant is a licensed assisted access (LAA) grant for the first component carrier.

15. An apparatus for wireless communication, comprising:
a processor;
memory coupled with the processor; and
instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
receive, at a user equipment (UE), a first grant to perform a first uplink transmission in a first subframe using a first component carrier;
receive, at the UE, a second grant to perform a second uplink transmission in a second subframe subsequent in time to the first subframe using a second component carrier;
determine, at the UE, that the second subframe is consecutive to the first subframe;
determine, at the UE, a number of radio frequency (RF) frontends available for use by the UE;
determine, at the UE, to null one or more symbols of the first uplink transmission in the first subframe based at least in part on the determination by the UE that the second subframe is consecutive to the first subframe and the determination by the UE of the number of RF frontends available for use by the UE; and
transition from a transmission mode using the first component carrier to a reception mode using the second component carrier during the nulled one or more symbols of the first uplink transmission.

16. The apparatus of claim 15 , wherein:
determining to null the one or more symbols of the first uplink transmission is based at least in part on an availability of a single RF frontend for use by the UE.

17. The apparatus of claim 15 , wherein:
the second component carrier is different from the first component carrier.

18. The apparatus of claim 15 , wherein the instructions are further executable by the processor to:
identify a modulation and coding scheme (MCS) of the first uplink transmission in the first subframe; and
determine a number of symbols to null based at least in part on the MCS of the first uplink transmission.

19. The apparatus of claim 15 , wherein the instructions are further executable by the processor to:
determine a first duration for a listen-before-talk (LBT) procedure of the second component carrier during the first subframe; and
determine a second duration to switch from a first communication mode to a second communication mode during the first subframe, wherein the one or more symbols to null are determined based at least in part on the first and second durations.

20. The apparatus of claim 19 , wherein the instructions are further executable by the processor to:
perform, during the first duration and prior to a beginning of the second subframe, the LBT procedure of the second component carrier.

Assignees

• Qualcomm Inc

Inventors

• Negro Francesco
• Brueck Stefan

Classifications

• H04L5/001 Primary

  the frequencies being arranged in component carriers · CPC title

• H04W72/23 Primary

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

• H04L27/26025

  Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking (allocating sub-channels of the transmission path H04L5/003) · CPC title

• H04L27/2602

  Signal structure · CPC title

• H04L1/00

  Arrangements for detecting or preventing errors in the information received {(correcting synchronisation H04L7/00)} · CPC title