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System and method for transmitting data in frame format using an R-Rake retransmission technique with blind identification of data frames

  • US 6,940,809 B2
  • Filed: 03/12/2004
  • Issued: 09/06/2005
  • Est. Priority Date: 09/22/1998
  • Status: Expired due to Term
First Claim
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1. A method for transmitting data frames in a communications system comprising a transmitter and a receiver, comprising:

  • transmitting a data frame from said transmitter to said receiver;

    when said transmitter receives a request from the receiver for retransmission of said data frame, retransmitting said data frame to the receiver without transmitting a signaling message identifying said retransmitted data frame;

    receiving said retransmitted data frame at said receiver;

    comparing said received retransmitted data frame to data frames stored in a buffer, the data frames stored in the buffer comprising data frames that were received with errors;

    identifying a first data frame stored in the buffer which potentially corresponds to the received retransmitted data frame; and

    combining the received retransmitted data frame with the first data frame to form a combined data frame; and

    wherein the comparing comprises determining whether a likelihood of a match between said received retransmitted data frame and one of said data frames in said buffer exceeds a first predetermined threshold; and

    wherein the identifying comprises identifying a data frame in which the likelihood of a match exceeds the first predetermined threshold as the first data frame; and

    further comprising;

    performing an error check on the combined data frame; and

    when said combined data frame does not pass the error checking, said receiver performs the following;

    storing in said buffer either said combined data frame, or said received retransmitted data frame and said first data frame, depending on whether the likelihood of the match exceeds a second predetermined threshold; and

    sending another retransmission request to said transmitter to request said transmitter to again retransmit said data frame.

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