Transmission method using parity packets, transmitter and repeater

• US 9,300,437 B2
• Filed: 11/14/2013
• Issued: 03/29/2016
• Est. Priority Date: 10/28/2009
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Inventors: Murakami, Yutaka
• Primary Examiner(s): Chase, Shelly A
• Application Number:
  US14/079,988
• Publication Number:
  US 20140075260A1
• Time in Patent Office: 866 Days
• US Class Current: 1/1
• 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: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04L 1/0068 by puncturing
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 1/1607 Details of the supervisory signal
• CPC Class Codes: H04L 1/1819 with retransmission of additional or different redundancy
• CPC Class Codes: H04L 1/1825 Adaptation of specific ARQ protocol parameters according to transmission conditions
• CPC Class Codes: H04L 1/1845 Combining techniques, e.g. code combining
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 2001/0093 Point-to-multipoint
• CPC Class Codes: H04L 2001/0097 Relays

Abstract

Problem: A packet error rate in a receiver needs to be effectively reduced.

Solution to Problem: A transmitter 11 inserts error detection codes into information packets on one-to-one basis, at a certain layer at which signal processing is performed earlier than at a physical layer, to obtain first information packets. The transmitter 11 codes the first information packets at the physical layer to obtain second information packets, and transmits the second information packets. At the certain layer, the transmitter 11 generates parity packets by coding the information packets and inserts the error detection codes into the parity packets on one-to-one basis to obtain first parity packets. The transmitter codes the first parity packets at the physical layer to obtain second parity packets. The transmitter 11 transmits the second parity packets in accordance with a transmission request from each of one or more receivers.

Claims

1. A transmission method executed by a transmitting apparatus to transmit a plurality of contents to a plurality of terminals, wherein

each of the contents has transmission count information indicating a number of times the content is to be transmitted by the transmitting apparatus,

the transmission method comprising:

a first transmission step of generating and transmitting a first transmission signal which transfers at least a portion of a plurality of data packets configured by a plurality of content packets, storing data of the content therein, and by a plurality of parity packets, generated from the content packets, and

a second transmission step of, when the transmission count information of the content indicates a plurality of times, generating a second transmission signal including the plurality of data packets, and transmitting the second transmission signal during a period which differs from a period during which the first transmission signal is transmitted.

2. A reception method for receiving a plurality of contents which are transmitted to a plurality of terminals by a transmitting apparatus, wherein

each of the contents has transmission count information indicating a number of times the content is to be transmitted by the transmitting apparatus,

the reception method comprising:

a reception step of, when the transmission count information of the content indicates a plurality of times, receiving at least one of a first transmission signal and a second transmission which are transmitted by the transmitting apparatus during different periods, the first transmission signal and the second transmission signal each transferring at least a portion of a plurality of data packets configured by a plurality of content packets, storing data of the content therein, and by a plurality of parity packets, generated from the content packets, and

a retransmission request step of judging whether the content packets are restorable by performing error correction processing using data packets which are received without error from the at least one of the first transmission signal and the second transmission signal, and when judging that the content packets are not restorable, identifying data packets which are required in order to restore the content packets and requesting retransmission of the data packets which are identified.

3. A transmitting apparatus for transmitting a plurality of contents to a plurality of terminals, wherein

each of the contents has transmission count information indicating a number of times the content is to be transmitted by the transmitting apparatus,

the transmitting apparatus comprising,

a transmitting unit configured to:

generate and transmit a first transmission signal which transfers at least a portion of a plurality of data packets configured by a plurality of content packets, storing data of the content therein, and by a plurality of parity packets, generated from the content packets, and

generate a second transmission signal including the plurality of data packets when the transmission count information of the content indicates a plurality of times, and transmit the second transmission signal during a period which differs from a period during which the first transmission signal is transmitted.

4. A reception apparatus for receiving a plurality of contents which are transmitted to a plurality of terminals by a transmitting apparatus, wherein

each of the contents has transmission count information indicating a number of times the content is to be transmitted by the transmitting apparatus,

the reception apparatus comprising:

a reception unit configured to, when the transmission count information of the content indicates a plurality of times, receive at least one of a first transmission signal and a second transmission which are transmitted by the transmitting apparatus during different periods, the first transmission signal and the second transmission signal each transferring at least a portion of a plurality of data packets configured by a plurality of content packets, storing data of the content therein, and by a plurality of parity packets, generated from the content packets, and

a retransmission unit configured to judge whether the content packets are restorable by performing error correction processing using data packets which are received without error from the at least one of the first transmission signal and the second transmission signal, and when judging that the content packets are not restorable, identify data packets which are required in order to restore the content packets and request retransmission of the data packets which are identified.