Method for receiving control information in orthogonal frequency division multiplexing system of mobile communication system

• US 8,363,743 B2
• Filed: 07/25/2011
• Issued: 01/29/2013
• Est. Priority Date: 06/21/2007
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Ahn, Joon Kui, Yun, Young Woo, Kim, Ki Jun, Kim, Eun Sun, Lee, Dae Won, Seo, Dong Youn, Yoon, Suk Hyon
• Primary Examiner(s): Tran, Khai
• Application Number:
  US13/190,318
• Publication Number:
  US 20110280328A1
• Time in Patent Office: 554 Days
• Field of Search: 375/260, 375/147, 375/219, 375/267, 370/329, 370/330, 370/337, 370/342, 370/468, 455/450, 455/451, 455/454, 714/748, 714/749
• 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 of configuring number n of OFDM (Orthogonal Frequency Division Multiplexing) symbols which is used for first channels that carry downlink control information at a mobile terminal in a wireless communication system, the method comprising:

receiving information indicating number m of OFDM symbols which is used for second channels that carry hybrid automatic repeat request (HARQ) Acknowledgements/Negative Acknowledgements (ACK/NACKs); and

if the number m is a predetermined value N, assuming that the number n of OFDM symbols which is used for first channels is equal to the predetermined value N,

wherein the predetermined value N is a maximum number of OFDM symbols for the first channels.

2. The method of claim 1, further comprising:

receiving the downlink control information and the HARQ ACK/NACKs through the first and second channels, respectively.

3. The method of claim 1, wherein the first channels are physical downlink control channels (PDCCHs).

4. The method of claim 1, further comprising:

receiving information indicating the number n of OFDM symbols which is used for first channels,

wherein the number is equal to or greater than the number m (n≧

m) and a transmission interval of the information indicating the number is greater than a transmission interval of the information indicating the number n.

5. A mobile terminal used in a wireless communication system, the mobile terminal comprising:

a radio frequency unit; and

a processor,

wherein the processor is configured to;

configure number n of OFDM (Orthogonal Frequency Division Multiplexing) symbols which is used for first channels that carry downlink control information; and

receive information indicating number m of OFDM symbols which is used for second channels that carry hybrid automatic repeat request (HARQ) Acknowledgements/Negative Acknowledgements (ACK/NACKs), and

wherein if the number m is a predetermined value N, the processor is further configured to assume that the number n of OFDM symbols which is used for first channels is equal to the predetermined value N,

wherein the predetermined value N is a maximum number of OFDM symbols for the first channels.

6. The mobile terminal of claim 5, wherein the processor is further configured to receive the downlink control information and the HARQ ACK/NACKs through the first and second channels, respectively.

7. The mobile terminal of claim 5, wherein the first channels are physical downlink control channels (PDCCHs).

8. The mobile terminal of claim 5, wherein the processor is further configured to receive information indicating the number n of OFDM symbols which is used for first channels,

wherein the number n is equal to or greater than the number m (n≧

m) and a transmission interval of the information indicating the number m is greater than a transmission interval of the information indicating the number n.