Method and apparatus of controlling uplink transmission in a wireless communication system

Patent metadata

Field	Value
Publication number	US-9578629-B2
Application number	US-201314385943-A
Country	US
Kind code	B2
Filing date	May 10, 2013
Priority date	May 10, 2012
Publication date	Feb 21, 2017
Grant date	Feb 21, 2017

Abstract

The present invention is directed to a method and an apparatus used for in a wireless communication system. Specifically, the present invention is directed to a method of controlling uplink transmission and an apparatus therefore, in which the method comprises: receiving a signal including information related with an assignment of a TAG for SCell; and considering SCell as having no valid uplink timing if TAT of the TAG is not running.

First claim

The invention claimed is:

1. A method of controlling uplink transmission at a user equipment configured with a Secondary Cell (SCell) belonging to a certain Timing Advance Group (TAG) in a wireless communication system, the method comprising:
receiving a signal indicating that a TAG of the SCell is changed from the certain TAG to a newly assigned TAG;
determining whether a Time Alignment Timer (TAT) of the newly assigned TAG is running or not when the TAG of the SCell is changed from the certain TAG to the newly assigned TAG; and
considering the SCell as having no valid uplink timing if a the TAT of the newly assigned TAG is not running, even if a TAT of the certain TAG is running.

2. The method of claim 1 , further comprising:
flushing all Hybrid ARQ Repeat reQuest (HARQ) buffers if the TAT of the newly assigned TAG is not running.

3. The method of claim 2 , further comprising:
notifying an upper layer to release Physical Uplink Control Channel (PUCCH) resource and Sounding Reference Signal (SRS) if the TAT of the newly assigned TAG is not running.

4. The method of claim 3 , further comprising:
clearing any configured downlink assignment and uplink grant if the TAT of the newly assigned TAG is not running.

5. The method of claim 1 , wherein the signal is a Radio Resource Control (RRC) signal or a Medium Access Control (MAC) signal.

6. A User Equipment (UE) configured with a Secondary Cell (SCell) belonging to a certain Timing Advance Group (TAG) and further configured to control uplink transmission in a wireless communication system, the UE comprising:
a radio frequency (RF) module; and
a processor, wherein the processor is configured to:
receive a signal indicating that a TAG of the SCell is changed from the certain TAG to a newly assigned TAG;

determine whether a Time Alignment Timer (TAT) of the newly assigned TAG is running or not when the TAG of the SCell is changed from the certain TAG to the newly assigned TAG; and
consider the SCell as having no valid uplink timing if the TAT of the newly assigned TAG is not running, even if a TAT of the certain TAG is running.

7. The UE of claim 6 , wherein the processor is further configured to:
flush all Hybrid ARQ Repeat reQuest (HARM) buffers if the TAT of the newly assigned TAG is not running.

8. The UE of claim 7 , wherein the processor is further configured to:
notify an upper layer to release Physical Uplink Control Channel (PUCCH) resource and Sounding Reference Signal (SRS) if the TAT of the newly assigned TAG is not running.

9. The UE of claim 8 , wherein the processor is further configured to:
clear any configured downlink assignment and uplink grant if the TAT of the newly assigned TAG is not running.

10. The UE of claim 6 , wherein the signal is a Radio Resource Control (RRC) signal or a Medium Access Control (MAC) signal.

11. The method of claim 1 , further comprising:
initiating a Random Access (RA) procedure on the SCell if the SCell is considered as having no valid uplink timing.

12. The method of claim 1 , further comprising:
considering the SCell as having valid uplink timing and performing uplink transmission to the SCell if the TAT of the newly assigned TAG is running.

13. The UE of claim 6 , wherein the processor is further configured to initiate a Random Access (RA) procedure on the SCell if the SCell is considered as having no valid uplink timing.

14. The UE of claim 6 , wherein the processor is further configured to consider the SCell as having valid uplink timing and perform uplink transmission to the SCell if the TAT of the newly assigned TAG is running.

Assignees

• Lg Electronics Inc

Inventors

• Lee Sunyoung
• Yi Seungjune
• Park Sungjun
• Lee Youngdae
• Jung Sunghoon

Classifications

• H04W72/21 Primary

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

• H04W56/0045

  compensating for timing error by altering transmission time · CPC title

• H04W72/0413 Primary

  Electricity · mapped topic

• H04J11/005 Primary

  of intercell interference · CPC title