METHOD FOR TRANSMITTING HARQ ACK/NACK FROM USER EQUIPMENT SIMULTANEOUSLY ACCESSING MULTIPLE CELLS

• US 20160249338A1
• Filed: 08/11/2014
• Published: 08/25/2016
• Est. Priority Date: 10/30/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Hwang, Daesung, Ahn, Joonkui, Yi, Yunjung
• Granted Patent: US 9,974,057 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 1/1822 involving configuration of automatic repeat request [ARQ] with parallel processes
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• 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: H04L 5/1469 using time-sharing
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management

Abstract

One disclosure of the present specification provides a user equipment method. The method comprises the steps of: receiving a time division duplex (TDD) uplink (UL)-downlink (DL) configuration from a frequency division duplex (FDD)-based primary cell; receiving downlink data from at least one secondary cell; determining an uplink subframe of the primary cell to transmit a hybrid automatic repeat request (HARQ) acknowledgement (ACK)/negative-acknowledgement (NACK) for the received downlink data, which is transmitted from the at least one secondary cell, according to the TDD UL-DL configuration; and transmitting the HARQ ACK/NACK from the determined uplink subframe to the primary cell.

Claims

1. A method for transmitting a hybrid automatic repeat request (HARQ) acknowledgement (ACK)/non-acknowledgement (NACK), the method performed by a user equipment (UE) and comprising:

receiving a time division duplex (TDD) uplink (UL)-downlink (DL) configuration from a frequency division duplex (FDD)-based primary cell;

receiving downlink data from at least one secondary cell;

determining an uplink subframe of the primary cell to transmit an HARQ ACK/NACK with respect to the downlink data received from the at least one secondary cell according to the TDD UL-DL configuration; and

transmitting the HARQ ACK/NACK to the primary cell on the determined uplink subframe.

2. The method of claim 1, wherein the TDD UL-DL configuration is received through system information.

3. The method of claim 2, wherein the system information is a system information block (SIB).

4. The method of claim 1, further comprising:

receiving an offset for the TDD UL-DL configuration,

wherein in the determination, the uplink subframe to transmit the HARQ ACK/NACK is determined based on the TDD UL-DL configuration and the offset.

5. The method of claim 4, wherein the offset is UE-specific and thus varies depending on a UE.

6. The method of claim 5, wherein the uplink subframe to transmit the HARQ ACK/NACK varies depending on a UE according to the offset.

7. A user equipment (UE) comprising:

a transceiver to receive a time division duplex (TDD) uplink (UL)-downlink (DL) configuration from a frequency division duplex (FDD)-based primary cell and to receive downlink data from at least one secondary cell; and

a processor to control the transceiver and to determine an uplink subframe of the primary cell to transmit a hybrid automatic repeat request (HARQ) acknowledgement (ACK)/non-acknowledgement (NACK) with respect to the downlink data received from the at least one secondary cell according to the TDD UL-DL configuration,

wherein the processor transmits the HARQ ACK/NACK to the primary cell on the determined uplink subframe through the transceiver.

8. The UE of claim 7, wherein the TDD UL-DL configuration is received through system information.

9. The UE of claim 8, wherein the system information is a system information block (SIB).

10. The UE of claim 7, wherein the transceiver is further configured to:

receive an offset for the TDD UL-DL configuration,

wherein in the determination the uplink subframe to transmit the HARQ ACK/NACK is determined based on the TDD UL-DL configuration and the offset.

11. The UE of claim 10, wherein the offset is UE-specific and thus varies depending on a UE.

12. The UE of claim 11, wherein the uplink subframe to transmit the HARQ ACK/NACK varies depending on a UE according to the offset.