Automatic Retransmission Request Control System and Retransmission Method in Memo-Ofdm System

• US 20070255993A1
• Filed: 09/13/2004
• Published: 11/01/2007
• Est. Priority Date: 09/13/2004
• Status: Active Grant

• Current Assignee: INVT SPE LLC (FIG LLC (d/b/a Fortress Investment Group LLC))
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Loh, Lee Ying, Yap, Choo Eng
• Granted Patent: US 8,775,890 B2
• Time in Patent Office: Days
• US Class Current: 714/748
• CPC Class Codes: H03M 13/09 Error detection only, e.g. using cyclic redundancy check [CRC] codes or single parity bit
• CPC Class Codes: H03M 13/23 using convolutional codes, e.g. unit memory codes
• CPC Class Codes: H03M 13/2957 Turbo codes and decoding
• CPC Class Codes: H03M 13/6306 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 Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04L 1/0001 Systems modifying transmission characteristics according to link quality, e.g. power backoff adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04
• CPC Class Codes: H04L 1/0625 Transmitter arrangements
• CPC Class Codes: H04L 1/0643 block codes
• CPC Class Codes: H04L 1/0656 Cyclotomic systems, e.g. Bell Labs Layered Space-Time [BLAST]
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 1/1819 with retransmission of additional or different redundancy
• CPC Class Codes: H04L 1/1822 involving configuration of automatic repeat request [ARQ] with parallel processes
• CPC Class Codes: H04L 1/1825 Adaptation of specific ARQ protocol parameters according to transmission conditions
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements

Abstract

An automatic retransmission request control system in OFDM-MIMO communication system. In this system, an ACK/NACK output part (320) of a receiver transmits, to a transmitter, a feedback information of positive or negative response based on the result of a cyclic redundancy check. An error data stream decision part (310) of the transmitter determines, based on the feedback information, a data stream that need be retransmitted, and a retransmission mode selection part (312) selects a retransmission mode from among (a) a mode in which to transmit the data, which are to be retransmitted, via the same antenna as in the previous transmission, while transmitting, at the same time, new data by use of an antenna via which no data retransmission is requested; (b) a mode in which to transmit the data, which are to be retransmitted, via an antenna via which no retransmission is requested, while transmitting new data via another antenna at the same time; (c) a mode in which to use STBC to retransmit the data via an antenna via which no retransmission is requested; and (d) a mode in which to use STBC to retransmit the data via all the available antennas.

Claims

1. A retransmission method based on automatic repeat request (ARQ) in a multiple-input multiple-output (MIMO) communication system using orthogonal frequency division multiplexing (OFDM), the method comprising the steps of:

at a receiver;

executing cyclic redundancy check (CRC) for data received from a transmitter, for every transmit antenna of the transmitter; and

transmitting to the transmitter feedback information of acknowledgment (ACK) or negative acknowledgement (NACK) based on a result of the cyclic redundancy check; and

at the transmitter;

identifying a data stream that requires retransmission based on the feedback information; and

selecting a retransmission mode for data of the feedback information of negative acknowledgment,

wherein the step of selecting retransmission mode comprises one of;

(a) a mode of transmitting data for retransmission using the same antenna as previous transmission and simultaneously transmitting new data using an antenna without a data retransmission request;

(b) a mode of transmitting data for retransmission using the antenna without retransmission request and simultaneously transmitting new data using an other antenna;

(c) a mode of retransmitting data using a space-time block coding (STBC), which is a spatial diversity technique, using the antenna without retransmission request; and

(d) a mode of retransmitting data using a space-time block coding (STBC) using all available antennas.

2. The retransmission method according to claim 1, wherein the step of identifying the antenna stream further comprises storing long-term ARQ statistics for each transmit antenna stream and making link adaptation decisions using the long-term ARQ statistics information.

3. The retransmission method according to claim 2, wherein the link adaptation comprises adaptive modulation and coding and power control

4. The transmission method according to claim 1, wherein a higher order of modulation is used at retransmission to improve a retransmission data rate.

5. The retransmission method according to claim 1, wherein a balance of fading difference and random effects between OFDM subcarriers are maintained using a different set of interleaving patterns at retransmission.

6. A retransmission method of automatic repeat request (ARQ) in a multiple-input multiple-output (MIMO) communication system employing orthogonal frequency division multiplexing (OFDM), wherein data for retransmission is transmitted using the same antenna as previous transmission, and new data is simultaneously transmitted using an antenna without retransmission request.

7. A retransmission method of automatic retransmission request (ARQ) in a multiple-input multiple-output (MIMO) communication system employing orthogonal frequency division multiplexing (OFDM), wherein data for retransmission is transmitted using an antenna without retransmission request, and new data is simultaneously transmitted using an other antenna.

8. A retransmission method of automatic retransmission request (ARQ) in a multiple-input multiple-output (MIMO) communication system using orthogonal frequency division multiplexing (OFDM), wherein data is retransmitted using a space-time block coding (STBC), whcih is a spatial diversity technique, using an antenna without retransmission request.

9. A retransmission method of automatic retransmission request (ARQ) in a multiple-input multiple-output (MIMO) communication system employing orthogonal frequency division multiplexing (OFDM), wherein data is retransmitted using a space-time block coding (STBC)I using all available antennas.

10. A system for automatic repeat request (ARQ) control in a multiple-input multiple-output (MIMO) communication system employing orthogonal frequency division multiplexing (OFDM), wherein:

a receiver comprises;

a CRC processing section that executes cyclic redundancy check (CRC) for data received from a transmitter for every transmit antenna of the transmitter; and

an ACK/NACK output section that sends to the transmitter feedback information of acknowledgement (ACK) or no-acknowledgment (NACK) based on a result of the cyclic redundancy check; and

the transmitter comprises;

an error data stream detecting section that identifies a data stream that requires retransmission based on the feedback information; and

a retransmission mode selecting section that selects a retransmission mode for retransmitting data of feedback information of negative acknowledgment; and

the retransmission mode selecting section selects one of;

(a) a mode of transmitting data for retransmission using the same antenna as previous transmission and simultaneously transmitting new data using an antenna without a data retransmission request;

(b) a mode of transmitting data for retransmission using the antenna without retransmission request and simultaneously transmitting new data using an other antenna;

(c) a mode of retransmitting data using a space-time block coding (STBC), which is a spatial diversity technique, using the antenna without retransmission request; and

(d) a mode of retransmitting data using a space-time block coding (STBC) using all available antennas.

11. The system according to claim 10, further comprising a multiple ACK/NACK receiving section that collects ARQ statistics obtained from the receiver.