METHOD FOR RECEIVING CONTROL INFORMATION IN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYSTEM OF MOBILE COMMUNICATION SYSTEM

• US 20090154580A1
• Filed: 06/20/2008
• Published: 06/18/2009
• Est. Priority Date: 06/21/2007
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Ki Jun, Seo, Dong Youn, Yun, Young Woo, Ahn, Joon Kui, Kim, Eun Sun, Yoon, Suk Hyon, Lee, Dae Won
• Granted Patent: US 8,019,017 B2
• Time in Patent Office: Days
• US Class Current: 375/260
• CPC Class Codes: H04J 11/0036 at the receiver
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated

Abstract

The present invention relates to receiving control information in an orthogonal frequency division multiplexing (OFDM) system of a mobile communication system. The present invention includes receiving information related to a number of OFDM symbols in a subframe for receiving first control information, receiving information related to a number of OFDM symbols in the subframe for receiving second control information, decoding the first control information according to the received information related to the number of OFDM symbols in the subframe for receiving the first control information, and decoding the second control information according to the received information related to the number of OFDM symbols in the subframe for receiving the second control information, wherein the number of OFDM symbols for receiving the first control information is less than or equal to the number of OFDM symbols for receiving the second control information.

Claims

1. A method for receiving control information in an orthogonal frequency division multiplexing (OFDM) system of a mobile communication system, the method comprising:

receiving information related to a number of OFDM symbols in a subframe for receiving first control information;

receiving information related to a number of OFDM symbols in the subframe for receiving second control information;

decoding the first control information according to the received information related to the number of OFDM symbols in the subframe for receiving the first control information; and

decoding the second control information according to the received information related to the number of OFDM symbols in the subframe for receiving the second control information,

wherein the number of OFDM symbols for receiving the first control information is less than or equal to the number of OFDM symbols for receiving the second control information.

2. The method of claim 1, wherein the second control information is not decoded if the number of OFDM symbols for receiving the first control information is greater than the number of OFDM symbols for receiving the second control information.

3. The method of claim 1, further comprising:

decoding the second control information using all possible numbers of OFDM symbols in the subframe for receiving the second control information if the number of OFDM symbols for receiving the first control information is greater than the number of OFDM symbols for receiving the second control information.

4. The method of claim 1, further comprising:

decoding the second control information using all possible numbers of OFDM symbols in the subframe for receiving the second control information greater than or equal to the number of OFDM symbols for receiving the first control information if the number of OFDM symbols for receiving the first control information is greater than the number of OFDM symbols for receiving the second control information.

5. The method of claim 1, wherein the first control information comprises an ACK/NACK signal.

6. The method of claim 1, wherein the second control information comprises a physical downlink control channel (PDCCH).

7. The method of claim 1, wherein the information related to the number of OFDM symbols in the subframe for receiving the first control information is received via a broadcast channel.

8. The method of claim 1, wherein the information related to the number of OFDM symbols in the subframe for receiving the second control information is received via a physical control channel format indicator channel.

9. The method of claim 1, wherein the number of OFDM symbols in the subframe for receiving the second control information is 1, 2 or 3.

10. A method for transmitting control information in an orthogonal frequency division multiplexing (OFDM) system of a mobile communication system, the method comprising:

transmitting information related to a number of OFDM symbols in a subframe for transmitting first control information;

transmitting information related to a number of OFDM symbols in the subframe for transmitting second control information;

transmitting the first control information according to the transmitted information related to the number of OFDM symbols in the subframe for transmitting the first control information; and

transmitting the second control information according to the transmitted information related to the number of OFDM symbols in the subframe for transmitting the second control information,

wherein the number of OFDM symbols for transmitting the first control information is less than or equal to the number of OFDM symbols for transmitting the second control information.

11. The method of claim 10, wherein the first control information comprises an ACK/NACK signal.

12. The method of claim 10, wherein the second control information comprises a physical downlink control channel (PDCCH).

13. The method of claim 10, wherein the information related to the number of OFDM symbols in the subframe for transmitting the first control information is transmitted via a broadcast channel.

14. The method of claim 10, wherein the information related to the number of OFDM symbols in the subframe for transmitting the second control information is transmitted via a physical control channel format indicator channel.

15. The method of claim 10, wherein the number of OFDM symbols for transmitting the second control information is 1, 2 or 3.