# US 8,542,697 B2 · Method of transmitting data in a wireless communication system

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 8,542,697 B2
- Document ID: US8542697B2
- Status: Granted
- Kind: B2
- Application number: 12/673,438
- Filed: 2008-06-13
- Published: 2011-09-01
- Granted: 2013-09-24
- Earliest claimed: 2007-08-14
- Assignees: LG Electronics Inc.
- Applicants: Hak Seong Kim; Bong Hoe Kim; Dong Wook Roh; Dae Won Lee; Suk Hyon Yoon; Dong Youn Seo
- Inventors: Hak Seong Kim; Bong Hoe Kim; Dong Wook Roh; Dae Won Lee; Suk Hyon Yoon; Dong Youn Seo
- Web page: https://patentgrep.com/patent/US8542697B2

## CPC

- H04L 1/1671: {the supervisory signal being transmitted together with control information}
- H04L 1/16: in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L 1/1867: Arrangements specially adapted for the transmitter end
- H04L 1/1896: {ARQ related signaling}
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information}
- H04L 27/2613: {Structure of the reference signals}
- H04L 5/0064: {Rate requirement of the data, e.g. scalable bandwidth, data priority}
- H04L 5/0094: {Indication of how sub-channels of the path are allocated}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A method of transmitting data in a wireless communication system is provided. The method includes transmitting downlink scheduling information regarding downlink radio resource allocation and uplink scheduling information regarding uplink radio resource allocation on a downlink control channel, transmitting downlink data on a downlink data channel according to the downlink scheduling information, and detecting an acknowledgement (ACK)/negative-acknowledgement (NACK) signal for the downlink data from a radio resource exclusively allocated to the ACK/NACK signal. According to the present invention, when an error occurs in a downlink control channel due to deterioration of a channel condition, the error can be promptly handled using an error detection protocol agreed between a user equipment and a base station. Therefore, data can be transmitted with higher reliability.

## Claims

### Claim 1

A method of transmitting data in a wireless communication system, the method comprising:
transmitting, by a base station (BS), downlink scheduling information regarding downlink radio resource allocation and uplink scheduling information regarding uplink radio resource allocation to a user equipment (UE) on a downlink control channel, the uplink scheduling information including a downlink transmission indicator indicating whether the downlink scheduling information is transmitted or not;
transmitting, by the BS, downlink data to the UE on a downlink data channel based on the downlink scheduling information;
detecting, by the BS, a first transmission error in the uplink scheduling information by determining whether expected control signals, including an acknowledgement (ACK)/negative-acknowledgement (NACK) signal corresponding to the downlink data, are detected from an uplink data channel based on the uplink scheduling information or not; and
if the expected control signals are not detected from the uplink data channel, detecting, by the BS, a second transmission error in the downlink scheduling information by determining whether the expected control signals, including the ACK/NACK signal corresponding to the downlink data, are detected from an uplink control channel.

### Claim 2 (depends on 1)

The method of claim 1, wherein the downlink control channel is a physical downlink control channel (PDCCH).

### Claim 3 (depends on 1)

The method of claim 1, wherein the uplink data channel is a physical uplink shared channel (PUSCH).

### Claim 4 (depends on 1)

The method of claim 1, wherein the uplink control channel is a physical uplink control channel (PUCCH).

### Claim 5 (depends on 1)

The method of claim 1, wherein the uplink control signals including at least one of a channel quality indicator (CQI), a scheduling request (SR), and an uplink multiplexing information indicator indicating whether a plurality of uplink control signals are multiplexed or not.

### Claim 6 (depends on 1)

The method of claim 1, wherein the first transmission error or the second transmission error is detected by performing discontinuous transmission (DTX) detection on a reference signal for the uplink control signals.

### Claim 7 (depends on 1)

The method of claim 1, wherein
the uplink control signals use fixed resources including at least one of a location of an uplink subframe, a location of a frequency resource, and a location of a single carrier frequency division multiple access (SC-FDMA) symbol.