METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING ACK/NACK SIGNAL TO SUPPORT HYBRID AUTOMATIC REPEAT REQUEST FOR MULTI-LAYER TRANSMISSION

• US 20080095040A1
• Filed: 10/24/2007
• Published: 04/24/2008
• Est. Priority Date: 10/24/2006
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Han, Jio-Kyu, Kim, Dong-Hee, Yu, Jae-Chon, Kwon, Hwan-Joon
• Application Number:
  US11/923,379
• Publication Number:
  US 20080095040A1
• Time in Patent Office: Days
• US Class Current: 370/210
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 27/2636 with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
• CPC Class Codes: H04L 27/26526 with inverse FFT [IFFT] or inverse DFT [IDFT] demodulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] receiver or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
• 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

Abstract

A method and apparatus for transmitting an Acknowledge (ACK)/Non-Acknowledge (NACK) signal to support Hybrid Automatic Repeat reQuest (H-ARQ) in an Orthogonal Frequency Division Multiplexing (OFDM) system are provided. A controller selects one of a plurality of Discrete Fourier Transform (DFT) input positions mapped to data channels over which a received data stream is transmitted in a group corresponding to a layer over which the received data stream is transmitted. The plurality of input positions is grouped into N groups for N layers for transmitting different data streams, and the input positions in each group are mapped to different data channels. A transmission module transmits an ACK/NACK signal for the received data stream over the DFT input position selected by the controller.

Claims

1. A method for transmitting an Acknowledge (ACK)/Non-Acknowledge (NACK) signal to support Hybrid Automatic Repeat reQuest (H-ARQ) in an Orthogonal Frequency Division Multiplexing (OFDM) system, the method comprising the steps of:

selecting one of a plurality of Discrete Fourier Transformer (DFT) input positions mapped to data channels over which a received data stream is transmitted in a group corresponding to a layer over which the received data stream is transmitted, wherein the plurality of input positions are grouped into N groups for N layers for transmitting different data streams, and the input positions in each group are mapped to different data channels; and

transmitting an ACK/NACK signal for the received data stream over the selected DFT input position.

2. The method of claim 1, wherein remaining input positions except for the at least one selected input position are used for interference measurement.

3. The method of claim 1, wherein the selection comprises:

selecting a DFT input position mapped to a data channel with a lowest index from among the data channels over which the received data stream is transmitted.

4. The method of claim 1, wherein when N is 2,

DFT input positions #0 to #7 included in a group of DFT input positions corresponding to a first layer out of the 2 layers are mapped to data channels #0 to #7, respectively;

and

DFT input positions #8 to #15 included in a group of DFT input positions corresponding to a second layer out of the 2 layers are mapped to data channels #0 to #7, respectively.

5. The method of claim 1, wherein when N is 4,

DFT input positions #0 to #3 included in a group of DFT input positions corresponding to a first layer among the 4 layers are mapped to two of data channels #0 to #7, respectively;

DFT input positions #8 to #11 included in a group of DFT inputs corresponding to a second layer among the 4 layers are mapped to two of data channels #0 to #7, respectively;

DFT input positions #4 to #7 included in a group of DFT inputs corresponding to a third layer among the 4 layers are mapped to two of data channels #0 to #7, respectively; and

DFT input positions #12 to #15 included in a group of DFT inputs corresponding to a fourth layer among the 4 layers are mapped to two of data channels #0 to #7, respectively.

6. The method of claim 1, wherein the transmitting comprises:

transmitting an ACK/NACK signal for the received data stream over one of 4 subtiles comprising a tile having time/frequency resources allocated for transmitting ACK/NACK signals for received data channels.

7. A method for receiving an Acknowledge (ACK)/Non-Acknowledge (NACK) signal to support Hybrid Automatic Repeat reQuest (H-ARQ) in an Orthogonal Frequency Division Multiplexing (OFDM) system, the method comprising the steps of:

selecting one of a plurality of Discrete Fourier Transformer (DFT) input positions mapped to data channels over which a data stream is transmitted in a group corresponding to a layer over which the data stream is transmitted, wherein the plurality of input positions are grouped into N groups for N layers for transmitting different data streams, and the input positions in each group are mapped to different data channels; and

receiving an ACK/NACK signal for the transmitted data stream over the selected DFT input position.

8. The method of claim 7, wherein remaining input positions except for the at least one selected input position are used for interference measurement.

9. The method of claim 7, wherein the selection comprises:

selecting a DFT input position mapped to a data channel with a lowest index from among the transmitted data channels.

10. The method of claim 7, wherein when N is 2,

DFT input positions #0 to #7 included in a group of DFT input positions corresponding to a first layer out of the 2 layers are mapped to data channels #0 to #7, respectively;

and

DFT input positions #8 to #15 included in a group of DFT input positions corresponding to a second layer out of the 2 layers are mapped to data channels #0 to #7, respectively.

11. The method of claim 7, wherein when N is 4,

DFT input positions #0 to #3 included in a group of DFT input positions corresponding to a first layer among the 4 layers are mapped to two of data channels #0 to #7, respectively;

DFT input positions #8 to #11 included in a group of DFT inputs corresponding to a second layer among the 4 layers are mapped to two of data channels #0 to #7, respectively;

DFT input positions #4 to #7 included in a group of DFT inputs corresponding to a third layer among the 4 layers are mapped to two of data channels #0 to #7, respectively; and

DFT input positions #12 to #15 included in a group of DFT inputs corresponding to a fourth layer among the 4 layers are mapped to two of data channels #0 to #7, respectively.

12. The method of claim 7, wherein the reception comprises:

receiving the ACK/NACK signal over one of 4 subtiles comprising a tile having time/frequency resources allocated for transmitting ACK/NACK signals for transmitted data channels.

13. An apparatus for transmitting an Acknowledge (ACK)/Non-Acknowledge (NACK) signal to support Hybrid Automatic Repeat reQuest (H-ARQ) in an Orthogonal Frequency Division Multiplexing (OFDM) system, the apparatus comprising:

a controller for selecting one of a plurality of Discrete Fourier Transformer (DFT) input positions mapped to data channels over which a received data stream is transmitted in a group corresponding to a layer over which the received data stream is transmitted, wherein the plurality of input positions are grouped into N groups for N layers for transmitting different data streams, and the input positions in each group are mapped to different data channels; and

a transmission module for transmitting an ACK/NACK signal for the received data stream over the DFT input position selected by the controller.

14. The apparatus of claim 13, wherein remaining input positions except for the at least one selected input position are used for interference measurement.

15. The apparatus of claim 13, wherein the controller selects a DFT input position mapped to a data channel with a lowest index from among data channels over which the received data stream is transmitted.

16. The apparatus of claim 13, wherein when N is 2,

DFT input positions #0 to #7 included in a group of DFT input positions corresponding to a first layer out of the 2 layers are mapped to data channels #0 to #7, respectively;

and

DFT input positions #8 to #15 included in a group of DFT input positions corresponding to a second layer out of the 2 layers are mapped to data channels #0 to #7, respectively.

17. The apparatus of claim 13, wherein when N is 4,

DFT input positions #0 to #3 included in a group of DFT input positions corresponding to a first layer among the 4 layers are mapped to two of data channels #0 to #7, respectively;

DFT input positions #8 to #11 included in a group of DFT inputs corresponding to a second layer among the 4 layers are mapped to two of data channels #0 to #7, respectively;

DFT input positions #4 to #7 included in a group of DFT inputs corresponding to a third layer among the 4 layers are mapped to two of data channels #0 to #7, respectively; and

DFT input positions #12 to #15 included in a group of DFT inputs corresponding to a fourth layer among the 4 layers are mapped to two of data channels #0 to #7, respectively.

18. The apparatus of claim 13, wherein the transmission module transmits the ACK/NACK signal over one of 4 subtiles comprising a tile having time/frequency resources allocated for transmitting ACK/NACK signals for received data channels.

19. An apparatus for receiving an Acknowledge (ACK)/Non-Acknowledge (NACK) signal to support Hybrid Automatic Repeat reQuest (H-ARQ) in an Orthogonal Frequency Division Multiplexing (OFDM) system, the apparatus comprising:

a controller for selecting one of a plurality of Discrete Fourier Transformer (DFT) input positions mapped to data channels over which a data stream is transmitted in a group corresponding to a layer over which a data stream is transmitted, wherein the plurality of input positions are grouped into N groups for N layers for transmitting different data streams, and the input positions in each group are mapped to different data channels; and

a reception module for receiving an ACK/NACK signal for the transmitted data stream over the DFT input position selected by the controller.

20. The apparatus of claim 19, wherein the reception module comprises:

an Inverse Discrete Fourier Transformer (IDFT) for outputting, to a combiner, the ACK/NACK signal received over the DFT input position selected by the controller;

an interference measurer for measuring, from the signals output from the IDFT, an interference for subtiles using remaining input positions except for the selected input position; and

the combiner for determining a weight for combining the ACK/NACK signal output from the IDFT using the interference measured by the interference measurer, and combining ACK/NACK signals repeatedly received by the IDFT using the determined weight.

21. The apparatus of claim 19, wherein the controller selects a DFT input position mapped to a data channel with a lowest index from among the transmitted data channels.

22. The apparatus of claim 19, wherein when N is 2,

DFT input positions #0 to #7 included in a group of DFT input positions corresponding to a first layer out of the 2 layers are mapped to data channels #0 to #7, respectively;

and

DFT input positions #8 to #15 included in a group of DFT input positions corresponding to a second layer out of the 2 layers are mapped to data channels #0 to #7, respectively.

23. The apparatus of claim 19, wherein when N is 4,

DFT input positions #0 to #3 included in a group of DFT input positions corresponding to a first layer among the 4 layers are mapped to two of data channels #0 to #7, respectively;

DFT input positions #8 to #11 included in a group of DFT inputs corresponding to a second layer among the 4 layers are mapped to two of data channels #0 to #7, respectively;

DFT input positions #4 to #7 included in a group of DFT inputs corresponding to a third layer among the 4 layers are mapped to two of data channels #0 to #7, respectively; and

DFT input positions #12 to #15 included in a group of DFT inputs corresponding to a fourth layer among the 4 layers are mapped to two of data channels #0 to #7, respectively.

24. The apparatus of claim 19, wherein the reception module receives the ACK/NACK signal over one of 4 subtiles comprising a tile having time/frequency resources allocated for transmitting ACK/NACK signals for received data channels.