# US 10,455,525 B2 · Method for transmitting control information, and apparatus therefor

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- Number: US 10,455,525 B2
- Document ID: US10455525B2
- Status: Granted
- Kind: B2
- Application number: 15/543,190
- Filed: 2016-01-28
- Published: 2018-01-11
- Granted: 2019-10-22
- Earliest claimed: 2015-01-28
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Suckchel Yang; Joonkui Ahn; Daesung Hwang
- Web page: https://patentgrep.com/patent/US10455525B2

## CPC

- H04W 52/32: TPC of broadcast or control channels
- H04L 1/18: Automatic repetition systems, e.g. Van Duuren systems
- H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04W 52/146: {Uplink power control}
- 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 52/48: during retransmission after error or non-acknowledgment
- 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. Specifically, the present invention relates to a method comprising: configuring a first cell group consisting of a PCell and zero or more SCells, and a second cell group consisting of SCell(s); determining transmit power of a first PUCCH to be transmitted through the PCell; and determining transmit power of a second PUCCH to be transmitted through a predetermined SCell in the second cell group, wherein the transmit powers of the first PUCCH and the second PUCCH are adjusted so that the total sum of transmit power of a terminal is not greater than the maximum transmit power of the terminal, considering a minimum guaranteed power which is assigned to each cell group according to protection priorities between cell groups, and the minimum guaranteed power assigned to each cell group is selectively applied to a specific UCI among a plurality of UCIs.

## Claims

### Claim 1

A method of controlling a transmit power by a user equipment (UE) in a wireless communication system, the method comprising:
configuring a first cell group consisting of a primary cell (PCell) and zero or more secondary cells (SCells) and a second cell group consisting of one or more SCells;
transmitting a physical random access channel (PRACH) in the first cell group in a time unit #n;
transmitting a first Hybrid Automatic Repeat reQuest Acknowledgement (HARQ-ACK) via a first physical uplink control channel (PUCCH) in the PCell in the time unit #n; and
transmitting a second HARQ-ACK via a second PUCCH in a predefined SCell of the second cell group in the time unit #n,
wherein a transmit power of the first HARQ-ACK is determined based on a value satisfying CG1.AN.power and a transmit power of the second HARQ-ACK is determined based on a value satisfying CG2.AN.power:
CG1.AN.power=min{(Pmax−PRACH.power−min(min{(Pmax−PRACH.power), CG2.AN.C-power}, CG2.AN.G-power)), CG1.AN.C-power}
CG2.AN.power=min{(Pmax−PRACH.power−CG1.AN.power), CG2.AN.C-power}
where min{A, B} indicates a smaller one of A and B, Pmax indicates a maximum transmit power of the UE, PRACH.power indicates a transmit power of the PRACH, CG1.AN.C-power indicates an original transmit power of the first HARQ-ACK, CG2.AN.C-power indicates an original transmit power of the second HARQ-ACK, and CG2.AN.G-power indicates a value related with power allocation.

### Claim 2

A user equipment (UE) for controlling a transmit power in a wireless communication system, the UE comprising:
a radio frequency (RF) unit; and
a processor, wherein the processor is configured to
configure a first cell group consisting of a primary cell (PCell) and zero or more secondary cells (SCells) and a second cell group consisting of one or more SCells,
transmit a physical random access channel (PRACH) in the first cell group in a time unit #n,
transmit a first Hybrid Automatic Repeat reQuest Acknowledgement (HARQ-ACK) via a first physical uplink control channel (PUCCH) in the PCell in the time unit #n, and
transmit a second HARQ-ACK via a second PUCCH in a predefined SCell of the second cell group in the time unit #n,
wherein a transmit power of the first HARQ-ACK is determined based on a value satisfying CG1.AN.power and a transmit power of the second HARQ-ACK is determined based on a value satisfying CG2.AN.power:
CG1.AN.power=min{(Pmax−PRACH.power−min(min{(Pmax−PRACH.power), CG2.AN.C-power}, CG2.AN.G-power)), CG1.AN.C-power}
CG2.AN.power=min{(Pmax−PRACH.power−CG1.AN.power), CG2.AN.C-power}
where min{A, B} indicates a smaller one of A and B, Pmax indicates a maximum transmit power of the UE, PRACH.power indicates a transmit power of the PRACH, CG1.AN.C-power indicates an original transmit power of the first HARQ-ACK, CG2.AN.C-power indicates an original transmit power of the second HARQ-ACK, and CG2.AN.G-power indicates a value related with power allocation.