Method and apparatus for controlling iterative decoding in a turbo decoder

Patent metadata

Field	Value
Publication number	US-8990652-B2
Application number	US-94710610-A
Country	US
Kind code	B2
Filing date	Nov 16, 2010
Priority date	Nov 17, 2009
Publication date	Mar 24, 2015
Grant date	Mar 24, 2015

Abstract

A method and apparatus for controlling iterative decoding in a turbo decoder are provided, in which a maximum number of iterations is determined for current data to be decoded based on at least one of current HARQ information necessary for a HARQ operation of the current data, previous HARQ information about previous data, and early stop information indicating whether iterative decoding of the previous data was early stopped. A turbo decoder iteratively decodes the current data within the maximum number of iterations.

First claim

What is claimed is:

1. A method for controlling iterative decoding in a turbo decoder, the method comprising:
determining a maximum number of iterations for current data to be decoded based on current Hybrid Automatic Repeat reQuest (HARQ) information necessary for a HARQ operation of the current data and previous HARQ information about previous data; and
iteratively decoding the current data within the maximum number of iterations for the current data,
wherein the determining of the maximum number of iterations comprises determining the maximum number of iterations for the current data based on early stop information indicating whether the iterative decoding of the previous data was stopped before a maximum number of iterations for the previous data, and
wherein the early stop information is applied when the current data is initial transmission data and the previous data is last transmission data of a specific packet.

2. The method of claim 1 , wherein each of the current HARQ information and the previous HARQ information includes a HARQ Retransmission Version (RV) indicating a retransmission number of the current data or the previous data.

3. The method of claim 1 , wherein the determination comprises:
determining whether the current data is initial transmission data or retransmission data according to the current HARQ information;
determining whether the current data corresponds to a last transmission of a specific encoded packet when the current data is retransmission data; and
incrementing the maximum number of iterations for the current data by a predetermined unit when the current data corresponds to the last transmission.

4. The method of claim 3 , wherein the determination further comprises maintaining the maximum number of iterations for the current data when the current data does not correspond to the last transmission of the specific encoded packet.

5. The method of claim 1 , wherein the determination comprises:
determining whether the previous data corresponds to a last transmission of a specific packet according to the previous HARQ information; and
determining whether early stop was applied to iterative decoding of the previous data when the previous data corresponds to the last transmission of the specific packet; and
decrementing the maximum number of iterations for the current data by a predetermined unit when the previous data corresponds to the last transmission of the specific packet and the early stop was not applied to the iterative decoding of the previous data.

6. The method of claim 5 , wherein the determination further comprises maintaining the maximum number of iterations for the current data when the previous data does not correspond to the last transmission of the specific packet or the early stop was applied to the iterative decoding of the previous data.

7. The method of claim 1 , wherein the previous HARQ information is received along with the previous data or on a control channel separately from a data channel and the current HARQ information is received along with the current data or on a control channel separately from a data channel.

8. The method of claim 1 , wherein each of the current HARQ information and the previous HARQ information indicates whether each transmission of the current data and the previous data is an initial transmission or a retransmission.

9. The method of claim 8 , wherein if each transmission of the current data and the previous data is a retransmission, each of the current HARQ information and the previous HARQ information indicates whether each transmission of the current data and the previous data is last retransmission or not.

10. An apparatus for controlling iterative decoding, the apparatus comprising:
a controller configured to determine a maximum number of iterations for current data to be decoded based on current Hybrid Automatic Repeat reQuest (HARQ) information necessary for a HARQ operation of the current data and previous HARQ information about the previous data; and
a turbo decoder configured to iteratively decode the current data within the maximum number of iterations for the current data,
wherein the controller determines the maximum number of iterations for the current data based on early stop information indicating whether the iterative decoding of the previous data was stopped before the maximum number of iterations for the previous data, and
wherein the early stop information is applied when the current data is initial transmission data and the previous data is last transmission data of a specific packet.

11. The apparatus of claim 10 , wherein each of the current HARQ information and the previous HARQ information includes a HARQ Retransmission Version (RV) indicating a retransmission number of the current data or the previous data.

12. The apparatus of claim 10 , wherein the controller increments the maximum number of iterations for the current data by a predetermined unit when the current data is retransmission data and corresponds to a last transmission of a specific packet.

13. The apparatus of claim 12 , wherein the controller maintains the maximum number of iterations for the current data when the current data is retransmission data and does not correspond to the last transmission of the specific encoded packet.

14. The apparatus of claim 10 , wherein the controller decrements the maximum number of iterations for the current data by a predetermined unit when the previous data corresponds to a last transmission of a specific packet and early stop was not applied to iterative decoding of the previous data.

15. The apparatus of claim 14 , wherein the controller maintains the maximum number of iterations for the current data when the previous data does not correspond to the last transmission of the specific packet or the early stop was applied to the iterative decoding of the previous data.

16. The apparatus of claim 10 , wherein the previous HARQ information is received along with the previous data or on a control channel separately from a data channel and the current HARQ information is received along with the current data or on a control channel separately from a data channel.

17. The apparatus of claim 10 , wherein each of the current HARQ information and the previous HARQ information indicates whether each transmission of the current data and the previous data is an initial transmission or a retransmission.

18. The apparatus of claim 17 , wherein if each transmission of the current data and the previous data is a retransmission, each of the current HARQ information and the previous HARQ information indicates whether each transmission of the current data and the previous data is last retransmission or not.

19. A method for controlling iterative decoding in a turbo decoder, the method comprising:
determining whether current data to be decoded is retransmission data based on current Hybrid Automatic Repeat reQuest (HARQ) information necessary for a HARQ operation of the current data;
determining whether the current data corresponds to a last transmission of a specific encoded packet when the current data is retransmission data;
determining a maximum number of iterations for the current data by incrementing a predetermined value by a predetermined unit when the current data is retransmission data and corresponds to the last transmission of the specific encoded packet; and
iteratively decoding the current data within the maximum number of iterations.

20. The method of claim 19 , further comprising:
determining whether pre

Assignees

• Park Hee-Young
• Kim Hun-Kee
• Samsung Electronics Co Ltd

Inventors

• Park Hee-Young
• Kim Hun-Kee

Classifications

• H03M13/6306

  Error control coding in combination with Automatic Repeat reQuest [ARQ] and diversity transmission, e.g. coding schemes for the multiple transmission of the same information or the transmission of incremental redundancy (H03M13/3761, H03M13/3769 and H03M13/635 take precedence) · CPC title

• H04L1/1812

  Hybrid protocols; Hybrid automatic repeat request [HARQ] · CPC title

• H03M13/2975 Primary

  Judging correct decoding, e.g. iteration stopping criteria · CPC title

• H04L1/0051

  Stopping criteria · CPC title

• H04L1/1845

  Combining techniques, e.g. code combining · CPC title