METHOD AND APPARATUS FOR TRANSMITTING UPLINK CONTROL INFORMATION IN A WIRELESS COMMUNICATION SYSTEM

• US 20130322355A1
• Filed: 07/26/2011
• Published: 12/05/2013
• Est. Priority Date: 07/26/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Seo, Dong Youn, Kim, Min Gyu, Yang, Suck Chel, Ahn, Joon Kui
• Granted Patent: US 9,042,357 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 1/0028 Formatting
• CPC Class Codes: H04L 1/1858 Transmission or retransmission of more than one copy of acknowledgement message
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management

Abstract

The present invention relates to a method for a terminal, in which a plurality of serving cells is established, to transmit uplink control information in a wireless communication system. The method comprises the following steps: receiving at least one physical downlink control channel (PDCCH) in a first subframe via a first serving cell from among the plurality of serving cells in a first subframe; receiving at least one physical downlink shared channel (PDSCH) via at least one serving cell from among the plurality of serving cells in the first subframe based on said at least on PDCCH; and transmitting, in a second subframe, an acknowledgement/non-acknowledgement (ACK/NACK) which indicates whether or not a decoding for said at least one PDSCH has succeeded. The ACK/NACK is transmitted using a first resource through only the first serving cell, and transmitted using a second resource in the second subframe if said at least one PDSCH is received through two or more serving cells from among the plurality of serving cells. The first resource is dynamically allocated through the PDCCH which schedules the first serving cell, and the second resource is designated in advance.

Claims

1. A method for transmitting uplink control information of a user equipment (UE) for which a plurality of serving cells are configured in a wireless communication system, the method comprising:

receiving at least one physical downlink control channel (PDCCH) in a first subframe through a first serving cell among the plurality of serving cells;

receiving at least one physical downlink shared channel (PDSCH) in the first subframe through at least one serving cell among the plurality of serving cells based on the at least one PDCCH; and

transmitting acknowledgement/not-acknowledgement (ACK/NACK) indicating success or failure of decoding of the at least one PDSCH in a second subframe,

wherein the ACK/NACK is transmitted by using first resources within the second subframe when the at least one PDSCH is received only by the first serving cell;

the ACK/NACK is transmitted by using second resources within the second subframe when the at least one PDSCH is received by two or more serving cells from among the plurality of serving cells; and

the first resources are allocated dynamically by a PDCCH which schedules the first serving cell and the second resources are predetermined.

2. The method of claim 1, wherein the first serving cell is a primary cell in which the UE carries out a procedure of establishing an initial connection to a base station or a procedure of re-establishing a connection.

3. The method of claim 2, wherein the first serving cell includes a first downlink component carrier and a first uplink component carrier, wherein the at least one PDCCH is received through the first downlink component carrier and the ACK/NACK is transmitted through the first uplink component carrier.

4. The method of claim 3, wherein the first resources are determined based on resources of a PDCCH which schedules the first downlink component carrier.

5. The method of claim 4, wherein the second resources are indicated by a radio resource control (RRC) message.

6. The method of claim 5, wherein A PDCCH which schedules serving cells except for the first serving cell from among the at least one PDCCH includes PDSCH aggregate information indicating the total number of PDSCHs transmitted through a plurality of serving cells in the first subframe.

7. The method of claim 6, wherein the PDSCH aggregate information is transmitted through a transmission power control (TPC) field of an uplink component carrier.

8. The method of claim 6, wherein, if the number of PDSCH received successfully through the at least one serving cell is the same as the number of PDSCHs indicated by the PDSCH aggregate information, one ACK is transmitted through the second resources.

9. The method of claim 6, wherein, if the number of PDSCH received successfully through the at least one serving cell is smaller than the number of PDSCHs indicated by the PDSCH aggregate information, one NACK is transmitted through the second resources.

10. The method of claim 1, wherein ACK/NACK transmitted through the second resources represents a number of PDSCHs received successfully through the at least one serving cell or a number of PDSCHs not received successfully.

11. The method of claim 1, wherein the transmitting ACK/NACK comprises obtaining the first resources from a PDCCH which schedules a PDSCH received through the first serving cell;

generating a modulation symbol by modulating the ACK/NACK;

determining a cyclic shift value based on the first resources;

generating a cyclic-shifted sequence by applying a cyclic shift to a base sequence by the cyclic shift value;

spreading the modulation symbol to the cyclic-shifted sequence; and

transmitting the spread sequence.

12. The method of claim 1, wherein the plurality of serving cells operate according to frequency division duplex (FDD) scheme which uses different frequencies in the uplink and downlink.

13. A user equipment, comprising:

an RF (Radio Frequency) unit transmitting or receiving radio signals; and

a processor connected to the RF unit,

wherein the processor receives at least one physical downlink control channel (PDCCH) through a first serving cell among a plurality of serving cells configured in a first subframe, receives at least one physical downlink shared channel (PDSCH) through at least one serving cell among the plurality of serving cells based the at least one PDCCH in the first subframe, and transmits ACK/NACK indicating success or failure of decoding of the at least one PDSCH in a second subframe,

the ACK/NACK being transmitted by using first resources within the second subframe when the at least one PDSCH is received only at the first serving cell; and

being transmitted by using second resources within the second subframe when the at least one PDSCH is received through two or more serving cells among the plurality of serving cells,

the first resources being allocated dynamically through a PDCCH which schedules the first serving cell while the second resources being predetermined.