# US 9,520,984 B2 · Method and apparatus for transmitting uplink signals in wireless communication system

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- Number: US 9,520,984 B2
- Document ID: US9520984B2
- Status: Granted
- Kind: B2
- Application number: 14/759,164
- Filed: 2014-01-03
- Published: 2015-11-26
- Granted: 2016-12-13
- Earliest claimed: 2013-01-03
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Suckchel Yang; Joonkui Ahn; Dongyoun Seo; Yunjung Yi
- Web page: https://patentgrep.com/patent/US9520984B2

## CPC

- H04W 52/146: {Uplink power control}
- H04L 1/18: Automatic repetition systems, e.g. Van Duuren systems
- H04L 1/1854: {Scheduling and prioritising arrangements}
- H04L 1/1861: {Physical mapping arrangements (for ACK signaling see also H04L5/0053)}
- H04L 5/00: Arrangements affording multiple use of the transmission path
- H04L 5/001: {the frequencies being arranged in component carriers}
- H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)}
- H04L 5/14: Two-way operation using the same type of signal, i.e. duplex
- H04L 27/2607: {Cyclic extensions}
- H04W 52/281: {taking into account user or data type priority}
- H04W 52/367: {Power values between minimum and maximum limits, e.g. dynamic range}
- H04W 52/50: at the moment of starting communication in a multiple access environment
- H04W 52/58: Format of the TPC bits
- H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA
- H04W 72/20: Control channels or signalling for resource management
- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H04L 1/1671: {the supervisory signal being transmitted together with control information}
- H04W 52/325: {Power control of control or pilot channels}
- H04W 52/34: TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
- H04W 52/365: {Power headroom reporting}
- H04W 52/40: during macro-diversity or soft handoff
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 76/15: Setup of multiple wireless link connections
- H04W 88/02: Terminal devices
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## 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

### Claim 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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 2)

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

### Claim 4 (depends on 1)

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).

### Claim 5 (depends on 1)

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).

### Claim 6 (depends on 1)

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).

### Claim 7 (depends on 1)

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.

### Claim 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.

### Claim 9 (depends on 8)

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.

### Claim 10 (depends on 9)

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

### Claim 11 (depends on 9)

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.

### Claim 12 (depends on 8)

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).

### Claim 13 (depends on 8)

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).

### Claim 14 (depends on 8)

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).