Method and apparatus for transmitting uplink signals in wireless communication system

• US 9,520,984 B2
• Filed: 01/03/2014
• Issued: 12/13/2016
• Est. Priority Date: 01/03/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Yang, Suckchel, Ahn, Joonkui, Seo, Dongyoun, Yi, Yunjung
• Primary Examiner(s): Trinh, Tan H
• Application Number:
  US14/759,164
• Publication Number:
  US 20150341864A1
• Time in Patent Office: 1,075 Days
• Field of Search: 455/69, 455/522, 455/501, 455/452, 455/561, 370/336, 370/329, 370/255, 370/254, 370/252, 370/330, 370/311, 370/280
• US Class Current: 1/1
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 1/18 Automatic repetition systems, e.g. Van Duuren systems
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 27/2607 Cyclic extensions
• CPC Class Codes: H04L 5/00 Arrangements affording multiple use of the transmission path
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/281 taking into account user or data type priority
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels
• CPC Class Codes: H04W 52/34 TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
• CPC Class Codes: H04W 52/365 Power headroom reporting
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 52/40 during macro-diversity or soft handoff
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment
• CPC Class Codes: H04W 52/58 Format of the TPC bits
• 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 72/20 : Control channels or signalling for resource management
• CPC Class Codes: H04W 72/21 : in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 76/15 : Setup of multiple wireless link connections
• CPC Class Codes: H04W 88/02 : Terminal devices

Abstract

The present invention relates to a wireless communication system. More particularly, the present invention relates to a method and an apparatus for a terminal controlling uplink power in a carrier aggregation-based wireless communication system, comprising the steps of: configuring a first cell and a second cell; transmitting a first PUCCH signal from subframe #n in the first cell; and transmitting a second PUCCH signal from subframe #n in the second cell, wherein when the sum of transmit power of the first PUCCH signal and transmit power of the second PUCCHJ signal exceeds a predetermined maximum transmit power configured to the terminal, the transmit power of the PUCCH signal having a lower priority from among the first UCCH signal and the second PUCCH signal is reduced or the transmission is dropped.

Claims

1. A method for a user equipment (UE) to manage a transmission power for control information in a wireless communication system, the method comprising:

determining a transmission power of a first physical uplink control channel (PUCCH) including first uplink control information (UCI) to be transmitted via a cell of a first cell group, the first cell group consisting of a primary cell (PCell) and zero or more secondary cells (SCells); and

determining a transmission power of a second PUCCH including second UCI to be transmitted via a cell of a second cell group, the second cell group consisting of one or more SCells only; and

when the UE reaches a maximum power limit due to overlap of the first PUCCH and the second PUCCH, reducing the transmission power of at least the first PUCCH or the second PUCCH as follows;

if the first UCI and the second UCI have different protection priorities, primarily reducing the transmission power of one of the first and second PUCCHs including UCI of a lower protection priority, and

if the first UCI and the second UCI have a same protection priority, primarily reducing the transmission power of the second PUCCH for the second cell group.

2. The method of claim 1, wherein the first cell group is managed by a first base station (BS) and the second cell group is managed a second BS different from the first BS, and the UE has communication connectivity both with the first and second BSs.

3. The method of claim 2, wherein the first BS manages and performs an radio resource connection (RRC) function associated with the UE.

4. The method of claim 1, wherein the protection priorities of UCI are defined as:

hybrid ARQ acknowledgement (HARQ-ACK)>

periodic channel status information (p-CSI).

5. The method of claim 1, wherein the protection priorities of UCI are defined as:

hybrid ARQ acknowledgement (HARQ-ACK)=scheduling request (SR)>

periodic channel status information (p-CSI).

6. The method of claim 1, wherein when the UE reaches the maximum power limit due to overlap of the first PUCCH and the second PUCCH, at least the first PUCCH or the second PUCCH are transmitted using reduced transmission power(s).

7. The method of claim 1, wherein if the first UCI and the second UCI have different protection priorities, the transmission power of one of the first and second PUCCHs including UCI of the lower protection priority is first reduced, and

if the first UCI and the second UCI have the same protection priority, the transmission power of the second PUCCH for the second cell group is first reduced.

8. A user equipment (UE) configured to manage a transmission power for control information in a wireless communication system, the UE comprising:

a radio frequency (RF) unit; and

a processor,

wherein the processor is configured to;

determine a transmission power of a first physical uplink control channel (PUCCH) including first uplink control information (UCI) to be transmitted via a cell of a first cell group, the first cell group consisting of a primary cell (PCell) and zero or more secondary cells (SCells);

determine a transmission power of a second PUCCH including second UCI to be transmitted via a cell of a second cell group, the second cell group consisting of one or more SCells only; and

when the UE reaches a maximum power limit due to overlap of the first PUCCH and the second PUCCH, reducing the transmission power of at least the first PUCCH or the second PUCCH as follows;

if the first UCI and the second UCI have different protection priorities, primarily reducing the transmission power of one of the first and second PUCCHs including UCI of a lower protection priority, and

if the first UCI and the second UCI have a same protection priority, primarily reducing the transmission power of the second PUCCH for the second cell group.

9. The UE of claim 8, wherein the first cell group is managed by a first base station (BS) and the second cell group is managed a second BS different from the first BS, and the UE has communication connectivity both with the first and second BSs.

10. The UE of claim 9, wherein the first BS manages and performs an radio resource connection (RRC) function associated with the UE.

11. The UE of claim 9, wherein if the first UCI and the second UCI have different protection priorities, the transmission power of one of the first and second PUCCHs including UCI of the lower protection priority is first reduced, and

if the first UCI and the second UCI have the same protection priority, the transmission power of the second PUCCH for the second cell group is first reduced.

12. The UE of claim 8, wherein when the UE reaches the maximum power limit due to overlap of the first PUCCH and the second PUCCH, at least the first PUCCH or the second PUCCH are transmitted using reduced transmission power(s).

13. The UE of claim 8, wherein the protection priorities of UCI are defined as:

hybrid ARQ acknowledgement (HARQ-ACK)>

periodic channel status information (p-CSI).

14. The UE of claim 8, wherein the protection priorities of UCI are defined as:

hybrid ARQ acknowledgement (HARQ-ACK)=scheduling request (SR)>

periodic channel status information (p-CSI).