Enhanced channel interleaving for optimized data throughput

• US 9,419,751 B2
• Filed: 05/08/2014
• Issued: 08/16/2016
• Est. Priority Date: 05/22/2001
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Sindhushayana, Nagabhushana, Black, Peter J.
• Primary Examiner(s): LIN, KENNY S
• Application Number:
  US14/272,852
• Publication Number:
  US 20140241249A1
• Time in Patent Office: 831 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0007 by modifying the frame length
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/005 Iterative decoding, including iteration between signal detection and decoding operation
• CPC Class Codes: H04L 1/0059 Convolutional codes
• CPC Class Codes: H04L 1/0066 Parallel concatenated codes
• CPC Class Codes: H04L 1/0069 Puncturing patterns
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 1/0083 Formatting with frames or packets; Protocol or part of protocol for error control
• CPC Class Codes: H04L 1/18 Automatic repetition systems, e.g. Van Duuren systems
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver

Abstract

In a transmission scheme wherein multi-slot packet transmissions to a remote station can be terminated by an acknowledgment signal from the remote station, code symbols can be efficiently packed over the multi-slot packet so that the remote station can easily decode the data payload of the multi-slot packet by decoding only a portion of the multi-slot packet. Hence, the remote station can signal for the early termination of the multi-slot packet transmission, which thereby increases the data throughput of the system.

Claims

1. A method for transmitting data, the method comprising:

receiving at a base station a data rate message transmitted from a remote station;

generating a plurality of data symbols and a plurality of parity symbols at the base station;

interleaving the plurality of data symbols to form a block of interleaved data symbols;

interleaving the plurality of parity symbols to form a block of interleaved parity symbols separate from the block of interleaved data symbols;

combining the block of interleaved data symbols and the block of interleaved parity symbols to form an output sequence in which the plurality of interleaved data symbols are located at a beginning portion of the output sequence and the plurality of interleaved parity symbols are located at an end portion of the output sequence;

transmitting the beginning portion of the output sequence to the remote station;

transmitting an initial segment of the end portion of the output sequence to the remote station; and

transmitting a subsequent segment of the end portion of the output sequence to the remote station if a positive acknowledgement from the remote station is not received.

2. The method of claim 1, further comprising:

storing the output sequence in a buffer; and

retrieving the output sequence from the buffer and retransmitting each portion of the output sequence successively, if a negative acknowledgment arrives from the remote station after the last portion of the output sequence is transmitted.

3. The method of claim 1, wherein said generating the plurality of data symbols and the plurality of parity symbols comprises turbo encoding said plurality of data symbols.

4. The method of claim 3, wherein said turbo encoding said plurality of data symbols comprises:

generating a first plurality of parity symbols from said plurality of data symbols using a first constituent encoder, wherein the first constituent encoder is a recursive, convolutional encoder; and

interleaving said plurality of data symbols using a turbo interleaver.

5. The method of claim 4, wherein said turbo encoding said plurality of data symbols comprises:

generating a second plurality of parity symbols from said plurality of interleaved data symbols using a second constituent encoder; and

selectively puncturing and repeating said plurality of data symbols and said plurality of parity symbols.

6. The method of claim 5, wherein said turbo encoding further comprises:

generating a third plurality of parity symbols using said first constituent encoder; and

generating a fourth plurality of parity symbols using said second constituent encoder.

7. The method of claim 6, wherein said turbo encoding further comprises:

interleaving said first and second plurality of parity symbols separately from said third and fourth plurality of parity symbols; and

transmitting each of said first and second plurality of parity symbols before transmitting said third and fourth plurality of parity symbols over said plurality of slots.

8. The method of claim 1, wherein said generating a plurality of data symbols and a plurality of parity symbols comprises convolutional encoding a plurality of data symbols.

9. An apparatus for transmitting data, the apparatus comprising:

means for receiving at a base station a data rate message transmitted from a remote station;

means for generating a plurality of data symbols and a plurality of parity symbols at the base station;

means for interleaving the plurality of data symbols to form a block of interleaved data symbols;

means for interleaving the plurality of parity symbols to form a block of interleaved parity symbols separate from the block of interleaved data symbols;

means for combining the block of interleaved data symbols and the block of interleaved parity symbols to form an output sequence in which the plurality of interleaved data symbols are located at a beginning portion of the output sequence and the plurality of interleaved parity symbols are located at an end portion of the output sequence;

means for transmitting the beginning portion of the output sequence to the remote station;

means for transmitting an initial segment of the end portion of the output sequence to the remote station; and

means for transmitting a subsequent segment of the end portion of the output sequence to the remote station if a positive acknowledgement from the remote station is not received.

10. The apparatus of claim 9, further comprising:

means for storing the output sequence in a buffer; and

means for retrieving the output sequence from the buffer and retransmitting each portion of the output sequence successively, if a negative acknowledgment arrives from the remote station after the last portion of the output sequence is transmitted.

11. The method of claim 9, wherein said means for generating the plurality of data symbols and the plurality of parity symbols comprises means for turbo encoding said plurality of data symbols.

12. The method of claim 11, wherein said means for turbo encoding said plurality of data symbols comprises:

means for generating a first plurality of parity symbols from said plurality of data symbols using a first constituent encoder, wherein the first constituent encoder is a recursive, convolutional encoder; and

means for interleaving said plurality of data symbols using a turbo interleaver.

13. The method of claim 12, wherein said means for turbo encoding said plurality of data symbols comprises:

means for generating a second plurality of parity symbols from said plurality of interleaved data symbols using a second constituent encoder; and

means for selectively puncturing and repeating said plurality of data symbols and said plurality of parity symbols.

14. The method of claim 13, wherein said means for turbo encoding further comprises:

means for generating a third plurality of parity symbols using said first constituent encoder; and

means for generating a fourth plurality of parity symbols using said second constituent encoder.

15. The method of claim 14, wherein said means for turbo encoding further comprises:

means for interleaving said first and second plurality of parity symbols separately from said third and fourth plurality of parity symbols; and

means for transmitting each of said first and second plurality of parity symbols before transmitting said third and fourth plurality of parity symbols over said plurality of slots.

16. The method of claim 9, wherein said means for generating a plurality of data symbols and a plurality of parity symbols comprises means for convolutional encoding a plurality of data symbols.

17. An apparatus for symbol transmission comprising:

a memory; and

a processor operably connected to the memory, wherein the processor is configured to;

receive at a base station a data rate message transmitted from a remote station;

generate a plurality of data symbols and a plurality of parity symbols at the base station;

interleave the plurality of data symbols to form a block of interleaved data symbols;

interleave the plurality of parity symbols to form a block of interleaved parity symbols separate from the block of interleaved data symbols;

combine the block of interleaved data symbols and the block of interleaved parity symbols to form an output sequence in which the plurality of interleaved data symbols are located at a beginning portion of the output sequence and the plurality of interleaved parity symbols are located at an end portion of the output sequence;

transmit the beginning portion of the output sequence to the remote station;

transmit an initial segment of the end portion of the output sequence to the remote station; and

transmit a subsequent segment of the end portion of the output sequence to the remote station if a positive acknowledgement from the remote station is not received.

18. The apparatus of claim 17, wherein the processor is further configured to:

store the output sequence in a buffer; and

retrieve the output sequence from the buffer and retransmit each portion of the output sequence successively, if a negative acknowledgment arrives from the remote station after the last portion of the output sequence is transmitted.

19. A non-transitory computer-readable medium programmed with a set of instructions, the instructions being executable by a processor to:

receive at a base station a data rate message transmitted from a remote station;

generate a plurality of data symbols and a plurality of parity symbols at the base station;

interleave the plurality of data symbols to form a block of interleaved data symbols;

interleave the plurality of parity symbols to form a block of interleaved parity symbols separate from the block of interleaved data symbols;

combine the block of interleaved data symbols and the block of interleaved parity symbols to form an output sequence in which the plurality of interleaved data symbols are located at a beginning portion of the output sequence and the plurality of interleaved parity symbols are located at an end portion of the output sequence;

transmit the beginning portion of the output sequence to the remote station;

transmit an initial segment of the end portion of the output sequence to the remote station; and

transmit a subsequent segment of the end portion of the output sequence to the remote station if a positive acknowledgement from the remote station is not received.

20. The computer-readable medium of claim 19, wherein the instructions are executable by the processor to:

store the output sequence in a buffer; and

retrieve the output sequence from the buffer and retransmit each portion of the output sequence successively, if a negative acknowledgment arrives from the remote station after the last portion of the output sequence is transmitted.