Data retransmission method and wireless communication apparatus

• US 8,832,517 B2
• Filed: 07/08/2013
• Issued: 09/09/2014
• Est. Priority Date: 12/28/2007
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Shinohara, Chiaki, Obuchi, Kazuhisa, Suzuki, Masaaki, Otonari, Akihide, Soejima, Yoshinori, Yamasaki, Miki, Okamoto, Shinya
• Primary Examiner(s): DUNCAN, MARC M
• Application Number:
  US13/936,723
• Publication Number:
  US 20130297982A1
• Time in Patent Office: 428 Days
• Field of Search: 714/748, 714/749, 714/751
• US Class Current: 714/748
• CPC Class Codes: H04L 1/0073 Special arrangements for feedback channel
• CPC Class Codes: H04L 1/1678 where the control information is for timing, e.g. time stamps
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1838 for semi-reliable protocols, e.g. for less sensitive applications such as streaming video buffer level management for video bitstream receiver H04N21/44004
• CPC Class Codes: H04L 1/1848 Time-out mechanisms
• CPC Class Codes: H04W 24/04 Arrangements for maintaining operational condition

Abstract

A method for retransmission data for a data transmission system in which a receiver transmits, when receiving data, a transmittal confirmation signal indicating whether the data is correctly received or not, and a transmitter refers to the transmittal confirmation signal and retransmits, when confirming that the data is not correctly received in the receiver, the data to the receiver, the method includes: at the transmitter, holding the transmitted data; keeping the holding of the transmitted data even after the transmitter confirms that the data is correctly received in the receiver by referring to the transmittal confirmation signal corresponding to the data and retransmitting, to the receiver, the data held therein in response to a request for retransmission of the data from the receiver.

Claims

1. A method for retransmission data for a data transmission system in which a receiver transmits, when receiving data, a transmittal confirmation signal indicating whether the data is correctly received or not, and a transmitter refers to the transmittal confirmation signal and retransmits, when confirming that the data is not correctly received in the receiver, the data to the receiver, the method comprising:

holding, by the transmitter, the transmitted data;

keeping, by the transmitter, the holding of the transmitted data even after the transmitter confirms that the data is correctly received in the receiver by referring to the transmittal confirmation signal corresponding to the data;

transmitting, by the receiver to the transmitter, the transmittal confirmation signal indicating that the transmitted data is not correctly received, the transmittal confirmation signal not protected by Cyclic Redundancy Check (CRC);

transmitting, by the receiver to the transmitter, a request for retransmission of the data along with the transmittal confirmation signal indicating that the transmitted data is not correctly received when the receiver cannot receive the data transmitted from the transmitter within a certain time period after the transmission of the transmittal confirmation signal indicating that the data is not correctly received, the request being protected by Cyclic Redundancy Check (CRC) and the transmittal confirmation signal being not protected by Cyclic Redundancy Check (CRC); and

retransmitting, by the transmitter, the data depending on the transmittal confirmation signal, in response to the request for retransmission of the data from the receiver.