APPARATUS AND METHOD FOR DEFINING PHYSICAL CHANNEL TRANSMIT/RECEIVE TIMINGS AND RESOURCE ALLOCATION IN TDD COMMUNICATION SYSTEM SUPPORTING CARRIER AGGREGATION

• US 20120307689A1
• Filed: 05/31/2012
• Published: 12/06/2012
• Est. Priority Date: 05/31/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: KIM, Youngbum, CHOI, Seunghoon, CHO, Joonyoung, JI, Hyoungju
• Granted Patent: US 8,942,202 B2
• Time in Patent Office: Days
• US Class Current: 370/280
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 41/08 Configuration management of networks or network elements address allocation H04L61/50
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04W 72/12 Wireless traffic scheduling
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A method of defining physical channel transmit/receiving timings and resource allocation is provided for use in a Time Division Duplex (TDD) communication system supporting carrier aggregation. A method for receiving, at a base station, a Hybrid Automatic Repeat Request (HARQ) acknowledgement from a terminal in a Time Division Duplex (TDD) system supporting carrier aggregation of a primary cell and at least one secondary cell includes transmitting a downlink physical channel through one of the primary and secondary cells, receiving the HARQ acknowledgement corresponding to the downlink physical channel of the primary cell at a first timing predetermined for the primary cell, and receiving the HARQ acknowledgement corresponding to the downlink physical channel of the secondary cell at second timing, wherein the second timing is determined according to the first timing.

Claims

1. A method for receiving, at a base station, a Hybrid Automatic Repeat Request (HARQ) acknowledgement from a terminal in a Time Division Duplex (TDD) system supporting carrier aggregation of a primary cell and at least one secondary cell, the method comprising:

transmitting a downlink physical channel through one of the primary and secondary cells;

receiving the HARQ acknowledgement corresponding to the downlink physical channel of the primary cell at a first timing predetermined for the primary cell; and

receiving the HARQ acknowledgement corresponding to the downlink physical channel of the secondary cell at second timing,

wherein the second timing is determined according to the first timing.

2. The method of claim 1, wherein the second timing is identical with the first timing when the downlink physical channels of the primary and secondary cells are transmitted at the same timing.

3. The method of claim 1, wherein the second timing is identical with a HARQ acknowledge reception timing corresponding to a downlink subframe of the primary cell which is closest to a transmission timing of the downlink physical channel of the secondary cell, when the downlink physical channels of the primary and secondary cells are transmitted at different timings.

4. The method of claim 1, further comprising suspending, when the primary cell is in a state of a downlink subframe and the secondary cell is in a state of an uplink subframe at the same timing, cross-carrier scheduling to the secondary cell at the timing.

5. A method for transmitting, at a terminal, a Hybrid Automatic Repeat Request (HARQ) acknowledgement to a base station in a Time Division Duplex (TDD) system supporting carrier aggregation of a primary cell and at least one secondary cell, the method comprising:

receiving a downlink physical channel through one of the primary and second cells;

transmitting the HARQ acknowledgement corresponding to the downlink physical channel of the primary cell at a first timing predetermined for the primary cell; and

transmitting the HARQ acknowledgement corresponding to the downlink physical channel of the secondary cell at a second timing,

wherein the second timing is determined according to the first timing.

6. The method of claim 5, wherein the second timing is identical with the first timing when the downlink physical channels of the primary and secondary cells are received at the same timing.

7. The method of claim 5, wherein the second timing is identical with a HARQ acknowledge transmission timing corresponding to a downlink subframe of the primary cell which is closest to a reception timing of the downlink physical channel of the secondary cell, when the downlink physical channels of the primary and secondary cells are received at different timings.

8. A base station for receiving a Hybrid Automatic Repeat Request (HARQ) acknowledgement from a terminal in a Time Division Duplex (TDD) system supporting carrier aggregation of a primary cell and at least one secondary cell, the base station comprising:

a transceiver which transmits and receives to and from the terminal; and

a controller which controls transmitting a downlink physical channel through one of the primary and secondary cells, receiving the HARQ acknowledgement corresponding to the downlink physical channel of the primary cell at a first timing predetermined for the primary cell, and receiving the HARQ acknowledgement corresponding to the downlink physical channel of the secondary cell at second timing,

wherein the controller configures the second timing according to the first timing.

9. The base station of claim 8, wherein the controller configures, when the downlink physical channels of the primary and secondary cells are transmitted at the same timing, the second timing to be identical with the first timing.

10. The base station of claim 8, wherein the controller configures, when the downlink physical channels of the primary and secondary cells are transmitted at different timings, the second timing to be identical with a HARQ acknowledge reception timing corresponding to a downlink subframe of the primary cell which is closest to a transmission timing of the downlink physical channel of the secondary cell.

11. The base station of claim 8, wherein the controller controls suspending, when the primary cell is in a state of a downlink subframe and the secondary cell is in a state of an uplink subframe at the same timing, cross-carrier scheduling to the secondary cell at the timing.

12. A terminal for transmitting a Hybrid Automatic Repeat Request (HARQ) acknowledgement to a base station in a Time Division Duplex (TDD) system supporting carrier aggregation of a primary cell and at least one secondary cell, the terminal comprising:

a transceiver which transmits and receives to and form a base station; and

a controller which controls receiving a downlink physical channel through one of the primary and second cells, transmitting the HARQ acknowledgement corresponding to the downlink physical channel of the primary cell at a first timing predetermined for the primary cell, and transmitting the HARQ acknowledgement corresponding to the downlink physical channel of the secondary cell at a second timing,

wherein controller configures the second timing according to the first timing.

13. The terminal of claim 12, wherein the controller configures, when the downlink physical channels of the primary and secondary cells are received at the same timing, the second timing to be identical with the first timing.

14. The terminal of claim 12, wherein the controller configures, when the downlink physical channels of the primary and secondary cells are received at different timings, the second timing to be identical with a HARQ acknowledge transmission timing corresponding to a downlink subframe of the primary cell which is closest to a reception timing of the downlink physical channel of the secondary cell.