COMMUNICATION METHOD USING CARRIER AGGREGATION AND DEVICE FOR SAME

• US 20170310452A1
• Filed: 09/25/2015
• Published: 10/26/2017
• Est. Priority Date: 09/27/2014
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: LEE, Seungmin, YANG, Suckchel
• Granted Patent: US 10,447,460 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• 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 5/0098 Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks

Abstract

The present invention relates to a method for transmitting and receiving a signal by a terminal in a wireless communication system supporting carrier aggregation. A method for transmitting and receiving a signal by a terminal can comprise the steps of: receiving configuration information about component carrier aggregation; on the basis of the configuration information, configuring a primary component carrier in a licensed band and configuring a secondary component carrier in an unlicensed band; transmitting data in a first subframe of the secondary component carrier; and receiving in a second subframe a response to the data. If the primary component carrier in the licensed band is configured as a component carrier on a TDD mode, the second subframe can be configured on the basis of a HARQ-ACK timing in a first condition.

Claims

1. A method of transmitting a signal by a user equipment in a wireless communication system supporting carrier aggregation, the method comprising:

receiving configuration information about component carrier aggregation;

configuring a primary component carrier in a licensed band and configuring a second component carrier in an unlicensed band, based on the configuration information;

transmitting data in a first subframe of the secondary component carrier; and

receiving a response to the data in a second subframe,

wherein, the second subframe is configured based on a hybrid automatic repeat and request acknowledgement/negative acknowledgement (HARQ-ACK) timing under a first condition when the primary component carrier is configured as a component carrier in a time division duplex (TDD) mode in the licensed band, and

wherein the HARQ-ACK timing is configured based on uplink-downlink configuration information of the primary component carrier configured as the component carrier in the TDD mode.

2. The method according to claim 1,

wherein the first condition is a state in which a TDD primary component carrier and a frequency division duplex (FDD) secondary component carrier are aggregated in the licensed band.

3. The method according to claim 2,

wherein the HARQ-ACK timing indicates a timing at which a response is received after data is transmitted on the FDD secondary component carrier under the first condition.

4. The method according to claim 1,

wherein the unlicensed band is a frequency band in which exclusive right to use is not guaranteed.

5. The method according to claim 1,

wherein the first subframe of the secondary component carrier is a downlink subframe.

6. The method according to claim 5,

wherein the first condition is a state in which the TDD primary component carrier and an FDD secondary component carrier are aggregated and the FDD secondary component carrier operates based on cross-carrier scheduling when a subframe of a TDD primary component carrier corresponding to the first subframe is configured as an uplink subframe and thus scheduling cannot be performed.

7. The method according to claim 6,

wherein the HARQ-ACK timing indicates a timing at which a response is received after data is transmitted on the FDD secondary component carrier operating based on the cross-carrier scheduling under the first condition.

8. The method according to claim 5,

wherein the first subframe is configured based on a time duration during which the secondary component carrier occupies and secures the unlicensed band.

9. The method according to claim 2,

wherein the HARQ-ACK timing is configured to be the same as a timing at which a response is received after data is transmitted on the TDD primary component carrier under the first condition.

10. The method according to claim 1,

wherein scheduling for downlink data of the secondary component carrier of the unlicensed band is configured based on multi-subframe scheduling.

11. The method according to claim 10,

wherein downlink subframes in which scheduling can be performed on the secondary component carrier based on the multi-subframe scheduling are limited to downlink subframes in a bundling window.

12. The method according to claim 11, wherein a response to data received in each of the downlink subframes in the bundling window is transmitted at the same uplink subframe timing.

13. The method according to claim 1, wherein scheduling for downlink data of the secondary component carrier of the unlicensed band is configured based on multi-subframe scheduling and cross-carrier scheduling.

14. The method according to claim 13, wherein the number and locations of downlink subframes of the secondary component carrier scheduled by multi-subframe scheduling are configured based on uplink-downlink configuration information about a TDD primary component carrier.

15. A user equipment for transmitting and receive a signal in a wireless communication system supporting carrier aggregation, the user equipment comprising:

a radio frequency (RF) unit configured to transmit and receiving a signal; and

a processor configured to control the RF unit,

wherein the processor is further configured to;

receive configuration information about component carrier aggregation using the RF unit,

configure a primary component carrier in a licensed band and configures a second component carrier in an unlicensed band, based on the configuration information,

transmit data in a first subframe of the secondary component carrier using the RF unit, and

receive a response to the data in a second subframe using the RF unit,

wherein the second subframe is configured based on a HARQ-ACK timing under a first condition when the primary component carrier is configured as a component carrier in a time division duplex (TDD) mode in the licensed band, and

wherein the HARQ-ACK timing is configured based on uplink-downlink configuration information of the primary component carrier configured as the component carrier in the TDD mode.