METHOD FOR CONTROLLING UPLINK TRANSMISSION POWER AND WIRELESS DEVICE USING SAME

• US 20140050205A1
• Filed: 09/28/2012
• Published: 02/20/2014
• Est. Priority Date: 09/29/2011
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Ahn, Joon Kui, Yang, Suck Chel, Seo, Dong Youn, Yi, Yun Jung
• Granted Patent: US 9,337,980 B2
• Time in Patent Office: Days
• US Class Current: 370/336
• CPC Class Codes: H04B 17/318 Received signal strength
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 4/00 Services specially adapted for wireless communication networks; Facilities therefor
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/16 Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/32 TPC of broadcast or control channels
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 56/0005 synchronizing of arrival of multiple uplinks
• 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 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

Provided are a method for controlling uplink transmission power and a wireless device. The wireless device decides a first transmission power of a first uplink channel, which is transmitted through a first wireless resource from a first serving cell, and decides a second transmission power of a second uplink channel, which is transmitted through a second wireless resource from a second serving cell. The first serving cell belongs to a first timing advance (TA) group, and the second serving cell belongs to a second TA group that differs from the first TA group. All or a portion of the first wireless resource and the second wireless resource overlap, wherein the sum of the first and second transmission powers in the overlapping portion is decided so as not to exceed a maximum transmission power.

Claims

1-14. -14. (canceled)

15. A method for uplink transmission in a wireless communication system, the method performed by a user equipment comprising:

receiving information about a first time alignment timer for a first timing advance group (TAG) and information about a second time alignment timer for a second TAG, the first TAG including a first serving cell and a second serving cell, the second TAG including a third serving cell;

receiving a timing advance command for the first TAG;

applying the timing advance command to the first serving cell and the second serving cell in order to adjust uplink timing;

starting or restarting the first time alignment timer upon applying the timing advance command;

if an uplink transmission toward the first serving cell at n^th subframe and an uplink transmission of the second serving cell at (n+1)^th subframe are overlapped due to the uplink timing adjustment while the first time alignment timer is running, completing the uplink transmission of the n^th subframe and not transmitting the overlapped portion of the (n+1)^th subframe.

16. The method of claim 15, wherein an uplink signal used for the uplink transmission of the first serving cell includes one of a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH) and a sounding reference signal (SRS).

17. The method of claim 15, wherein an uplink signal used for the uplink transmission of the second serving cell includes one of a PUCCH, a PUSCH and a SRS.

18. The method of claim 15, wherein the timing advance command is received at (n−

6)^th subframe and the timing advance command is applied at the n^th subframe.

19. The method of claim 15, wherein the overlapped portion includes a part of an orthogonal frequency division multiplexing (OFDM) symbol.

20. A user equipment for uplink transmission in a wireless communication system, the user equipment comprising:

a radio frequency (RF) unit configured to transmit and receive radio signals; and

a processor operatively coupled with the RF unit and configured to;

receive information about a first time alignment timer for a first timing advance group (TAG) and information about a second time alignment timer for a second TAG, the first TAG including a first serving cell and a second serving cell, the second TAG including a third serving cell;

receive a timing advance command for the first TAG;

apply the timing advance command to the first serving cell and the second serving cell in order to adjust uplink timing;

start or restart the first time alignment timer upon applying the timing advance command; and

if an uplink transmission of the first serving cell at n^th subframe and an uplink transmission of the second serving cell at (n+1)^th subframe are overlapped due to the uplink timing adjustment while the first time alignment timer is running, complete the uplink transmission of the n^th subframe and not transmit the overlapped portion of the (n+1)^th subframe.

21. The user equipment of claim 20, wherein an uplink signal used for the uplink transmission of the first serving cell includes one of a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH) and a sounding reference signal (SRS).

22. The user equipment of claim 20, wherein an uplink signal used for the uplink transmission of the second serving cell includes one of a PUCCH, a PUSCH and a SRS.

23. The user equipment of claim 20, wherein the timing advance command is received at (n−

6)^th subframe and the timing advance command is applied at the n subframe.

24. The user equipment of claim 20, wherein the overlapped portion includes a part of an orthogonal frequency division multiplexing (OFDM) symbol.