DETERMINATION OF TA ADJUSTMENT TIMING

• US 20190313407A1
• Filed: 04/03/2019
• Published: 10/10/2019
• Est. Priority Date: 04/05/2018
• Status: Active Grant

• Current Assignee: MediaTek, Inc.
• Original Assignee: MediaTek, Inc.
• Inventors: TSAI, Chiou-Wei
• Granted Patent: US 10,880,886 B2
• Time in Patent Office: Days
• CPC Class Codes: H04W 56/0045 compensating for timing error by altering transmission time
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 80/02 Data link layer protocols
• CPC Class Codes: H04W 84/042 Public Land Mobile systems, e.g. cellular systems
• CPC Class Codes: H04W 88/02 Terminal devices

Abstract

In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The UE receives, from a base station, a timing advance command on a first downlink component carrier in a first time slot measured from a perspective of a first uplink component carrier. The UE determines a number of slots between the first time slot and a second time slot measured from the perspective of the first uplink component carrier based on at least one of: a first time duration allocated to the UE for decoding a downlink data channel, and a second time duration allocated to the UE for preparing an uplink data channel. The UE applies a timing advance based on the timing advance command on the first uplink component carrier or a second uplink component carrier in the second time slot.

Claims

1. A method of wireless communication of a user equipment (UE), comprising:

receiving, from a base station, a timing advance command on a first downlink component carrier in a first time slot measured from a perspective of a first uplink component carrier;

determining a number of slots between the first time slot and a second time slot measured from the perspective of the first uplink component carrier based on at least one of;

a first time duration allocated to the UE for decoding a downlink data channel, and

a second time duration allocated to the UE for preparing an uplink data channel; and

applying a timing advance based on the timing advance command on the first uplink component carrier or a second uplink component carrier in the second time slot.

2. The method of claim 1, wherein the first time slot and the second time slot are further measured from a perspective of an uplink bandwidth part of the first uplink component carrier.

3. The method of claim 2, wherein the uplink bandwidth part of the first uplink component carrier is an uplink bandwidth part whose subcarrier spacing is the smallest among subcarrier spacings of all configured uplink bandwidth parts for all uplink component carriers in a timing advance group, wherein the second uplink component carrier is in the timing advance group.

4. The method of claim 2, wherein the first time duration is determined based on a first number of reference symbol periods that are determined based on a subcarrier spacing that is the smallest among subcarrier spacings of all configured uplink bandwidth parts for uplink component carriers in a timing advance group and all configured downlink bandwidth parts for corresponding downlink component carriers of the uplink component carriers.

5. The method of claim 4, wherein the second time duration is determined based on a second number of the reference symbol periods.

6. The method of claim 1, wherein the number of slots is determined further based on a predetermined timing advance value.

7. The method of claim 1, wherein the number of slots is determined further based on a processing latency at a media access control (MAC) layer of the UE.

8. The method of claim 1, wherein the first uplink component carrier is an uplink component carrier whose subcarrier spacing is the smallest among subcarrier spacings of uplink component carriers in a timing advance group, wherein the second uplink component carrier is in the timing advance group.

9. The method of claim 1, wherein the first time duration is determined based on a first number of reference symbol periods that are determined based on a subcarrier spacing that is the smallest among subcarrier spacings of uplink component carriers in a timing advance group and corresponding downlink component carriers of the uplink component carriers.

10. The method of claim 9, wherein the second time duration is determined based on a second number of the reference symbol periods.

11. An apparatus for wireless communication, the apparatus being a user equipment (UE), comprising:

a memory; and

at least one processor coupled to the memory and configured to;

receive, from a base station, a timing advance command on a first downlink component carrier in a first time slot measured from a perspective of a first uplink component carrier;

determine a number of slots between the first time slot and a second time slot measured from the perspective of the first uplink component carrier based on at least one of;

a first time duration allocated to the UE for decoding a downlink data channel, and

a second time duration allocated to the UE for preparing an uplink data channel; and

apply a timing advance based on the timing advance command on the first uplink component carrier or a second uplink component carrier in the second time slot.

12. The apparatus of claim 11, wherein the first time slot and the second time slot are further measured from a perspective of an uplink bandwidth part of the first uplink component carrier.

13. The apparatus of claim 12, wherein the uplink bandwidth part of the first uplink component carrier is an uplink bandwidth part whose subcarrier spacing is the smallest among subcarrier spacings of all configured uplink bandwidth parts for all uplink component carriers in a timing advance group, wherein the second uplink component carrier is in the timing advance group.

14. The apparatus of claim 12, wherein the first time duration is determined based on a first number of reference symbol periods that are determined based on a subcarrier spacing that is the smallest among subcarrier spacings of all configured uplink bandwidth parts for uplink component carriers in a timing advance group and all configured downlink bandwidth parts for corresponding downlink component carriers of the uplink component carriers.

15. The apparatus of claim 14, wherein the second time duration is determined based on a second number of the reference symbol periods.

16. The apparatus of claim 11, wherein the number of slots is determined further based on a predetermined timing advance value.

17. The apparatus of claim 11, wherein the number of slots is determined further based on a processing latency at a media access control (MAC) layer of the UE.

18. The apparatus of claim 11, wherein the first uplink component carrier is an uplink component carrier whose subcarrier spacing is the smallest among subcarrier spacings of uplink component carriers in a timing advance group, wherein the second uplink component carrier is in the timing advance group.

19. The apparatus of claim 11, wherein the first time duration is determined based on a first number of reference symbol periods that are determined based on a subcarrier spacing that is the smallest among subcarrier spacings of uplink component carriers in a timing advance group and corresponding downlink component carriers of the uplink component carriers.

20. A computer-readable medium storing computer executable code for wireless communication of a user equipment (UE), comprising code to:

receive, from a base station, a timing advance command on a first downlink component carrier in a first time slot measured from a perspective of a first uplink component carrier;

determine a number of slots between the first time slot and a second time slot measured from the perspective of the first uplink component carrier based on at least one of;

a first time duration allocated to the UE for decoding a downlink data channel, and

a second time duration allocated to the UE for preparing an uplink data channel; and

apply a timing advance based on the timing advance command on the first uplink component carrier or a second uplink component carrier in the second time slot.