METHOD OF COMMUNICATION USING FRAME

• US 20090219842A1
• Filed: 02/17/2009
• Published: 09/03/2009
• Est. Priority Date: 02/17/2008
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: MOON, Sungho, Kim, Dong Cheol, Kwak, Jin Sam, Han, Seung Hee, Kwon, Yeong Hyeon, Noh, Minseok, Lee, Hyun Woo
• Granted Patent: US 8,059,676 B2
• Time in Patent Office: Days
• US Class Current: 370/294
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/2603 Signal structure ensuring backward compatibility with legacy system
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/1469 using time-sharing

Abstract

A device and method for communicating by a mobile communication terminal in communication with a base station. The method according to an embodiment includes exchanging a frame of data with the base station. The frame of data includes a) a plurality of first subframes each having a first number of orthogonal frequency division multiple access (OFDMA) symbols, and b) a plurality of second subframes each having a second number of orthogonal frequency division multiple access (OFDMA) symbols different from the first number. A first and a last subframe each includes one of the plurality of first subframes.

Claims

1. A method of communicating by a mobile communication terminal in communication with a base station, comprising:

exchanging a frame of data with the base station, the frame of data including

a plurality of first subframes each having a first number of orthogonal frequency division multiple access (OFDMA) symbols, and

a plurality of second subframes each having a second number of orthogonal frequency division multiple access (OFDMA) symbols different from the first number,

wherein a first and a last subframe each comprises one of the plurality of first subframes.

2. The method of claim 1, wherein a number of the plurality of first subframes and a number of the plurality of second subframes are predetermined.

3. The method of claim 1, wherein a number of the plurality of first subframes and a number of the plurality of second subframes are determined based upon an instruction received from the base station.

4. The method of claim 1, wherein the frame has a cyclic prefix (CP) length of 1/16 useful symbol time (Tu).

5. The method of claim 1, wherein the first number of OFDMA symbols is seven (7) symbols and the second number of OFDMA symbols is six (6) symbols.

6. The method of claim 5, wherein the step of exchanging comprises time division duplexing (TDD) the frame with another frame.

7. The method of claim 6, wherein the plurality of first subframes includes 2 first subframes and the plurality of second subframes includes 6 second subframes.

8. The method of claim 7, wherein one of the 6 second subframes includes an idle symbol.

9. The method of claim 6, wherein the frame includes one first subframe followed by 6 second subframes followed by another first subframe.

10. The method of claim 9, wherein a 4^th of the six second subframes includes an idle symbol.

11. The method of claim 10, wherein the idle symbol is a sixth symbol of the 4^th second subframe.

12. The method of claim 6, wherein the plurality of first subframes and the plurality of second subframes are grouped into a plurality of downlink subframes followed by a plurality of uplink subframes.

13. The method of claim 12, wherein

the plurality of downlink subframes includes at least one of the plurality of first subframes followed by at least one of the plurality of second subframes, and

the plurality of uplink subframes includes at least one other of the plurality of second subframes followed by at least one other of the plurality of first subframes.

14. The method of claim 12, wherein a ratio between the plurality of uplink subframes and the plurality of downlink subframes is one of 4:

4, 6;

2, 7;

1, and 5;

3.

15. The method of claim 5, wherein the step of exchanging comprises frequency division duplexing (FDD) the frame with another frame.

16. The method of claim 15, wherein the plurality of first subframes includes 3 first subframes and the plurality of second subframes includes 5 second subframes.

17. The method of claim 15, wherein the frame includes one first subframe followed by 3 second subframes followed by a second first subframe followed by 2 second subframes followed by a third first subframe.

18. A mobile communication terminal configured to communicate with a base station, comprising:

a display;

a transceiver; and

a processor operatively connected to the display and transceiver, the processor configured to exchange a frame of data with the base station, the frame of data including

a plurality of first subframes each having a first number of orthogonal frequency division multiple access (OFDMA) symbols, and

a plurality of second subframes each having a second number of orthogonal frequency division multiple access (OFDMA) symbols different from the first number,

wherein a first and a last subframe each comprises one of the plurality of first subframes.