System and methods for transmitting data

• US 8,428,185 B1
• Filed: 09/30/2005
• Issued: 04/23/2013
• Est. Priority Date: 06/28/1999
• Status: Expired due to Fees

• Current Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Original Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Inventors: Driessen, Peter Frank, Kretschmer, Mathias R., Quackenbush, Schuyler Reynier, Snyder, James H.
• Primary Examiner(s): Ahn, Sam K
• Assistant Examiner(s): Wong, Linda
• Application Number:
  US11/240,170
• Time in Patent Office: 2,762 Days
• Field of Search: 375/219, 375/220, 375/221, 375/222, 375/295, 375/316, 714/100, 714/1, 714/2, 714/752, 714/753, 714/754, 714/755, 714/758, 714/787, 714/799, 714/800, 714/801, 714/746, 714/748, 714/749, 370/241
• US Class Current: 375/316
• CPC Class Codes: G06F 11/10 Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's
• CPC Class Codes: H03M 13/356 Unequal error protection [UEP]
• CPC Class Codes: H03M 13/6508 Flexibility, adaptability, parametrability and configurability of the implementation
• CPC Class Codes: H04L 1/0017 where the mode-switching is based on Quality of Service requirement
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0045 Arrangements at the receiver end
• CPC Class Codes: H04L 1/18 Automatic repetition systems, e.g. Van Duuren systems
• CPC Class Codes: H04L 1/1829 Arrangements specially adapted for the receiver end
• CPC Class Codes: H04L 2001/0098 Unequal error protection

Abstract

A system and method for transmitting data over a channel, in which the data are categorized in at least two different categories. For example, the data are categorized according to the effect on perceived degradation on the data when error mitigation is performed on the data. Corrupted data of the first category are replaced using a first replacement method, such as retransmission and forward error correction. The corrupted data of the second category are replaced using a second replacement method different from the first replacement method, e.g., error mitigation or interpolation.

Claims

1. A method for receiving data over a channel, comprising:

receiving, from a transmitter, a first plurality of data packets categorized into a first category of importance and a second category of importance, wherein the second category of importance comprises low importance, and wherein the first category of importance comprises a higher importance than the second category of importance, the categorization based on;

a determination of degradation associated with reconstructing the first plurality of data packets, and

a predictability of the first plurality of data packets based on an estimate of a difference between the first plurality of data packets and a result of error mitigation of the first plurality of data packets if data was unavailable due to transmission loss,

wherein the first plurality of data packets comprise sequential data packets categorized into the second category of importance, the sequential data packets comprising a second plurality of data packets, and a following data packet;

detecting the second plurality of data packets to be corrupted;

dynamically changing a categorization of the following data packet from the second category of importance to the first category of importance based on a data packet history of error occurrence to promote importance of the following data packet from the lower importance to the higher importance, wherein the data packet history of error occurrence comprises an indication of a corrupt state of the second plurality of data packets, and wherein the second plurality of data packets are determined to require mitigation; and

if the following data packet is determined to be corrupt, transmitting a request for retransmission of the following data packet based on the dynamically changing a categorization of the following data packet.

2. The method according to claim 1, wherein transmitting a request for retransmission is further based on an availability of bandwidth on the channel.

3. The method according to claim 1, wherein dynamically changing a categorization of the following data packet comprises:

changing the categorization of the following data packet to require retransmission of the following data packet when each of a series of previously received data packets of the first plurality of data packets is corrupt.

4. A system for receiving data over a channel, comprising:

a receiver adapted to receive a first plurality of data packets categorized into a first category of importance and a second category of importance, wherein the second category of importance comprises low importance, and wherein the first category of importance comprises a higher importance than the second category of importance, the categorization based on;

a determination of degradation associated with reconstructing the first plurality of data packets, and

a predictability of the first plurality of data packets based on an estimate of a difference between the first plurality of data packets and a result of error mitigation of the first plurality of data packets if data was unavailable due to transmission loss,

wherein the first plurality of data packets comprise sequential data packets categorized into the second category of importance, the sequential data packets comprising a second plurality of data packets, and a following data packet; and

an error correction circuit adapted to detect the second plurality of data packets to be corrupt, dynamically change a categorization of the following data packet from the second category of importance to the first category of importance based on a data packet history of error occurrence to promote importance of the following data packet from the lower importance to the higher importance, wherein the data packet history of error occurrence comprises an indication of a corrupt state of the second plurality of data packets, and wherein the second plurality of data packets are determined to require mitigation, and if the following data packet is determined to be corrupt, transmit a request for retransmission of the following data packet based on a dynamic change in categorization of the following data packet.

5. The system of claim 4, wherein the error correction circuit is further adapted to transmit the request for retransmission of the corrupted data packet based on an availability of bandwidth on the channel.

6. The system of claim 4, wherein the error correction circuit is adapted to dynamically change the categorization of the following data packet to require retransmission of the following data packet when each of a series of previously received data packets of the first plurality of data packets is corrupt.