Data transmission method and data transmission apparatus
First Claim
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1. A data transmission method for transmitting data in units of packets, said method comprising:
- a first step of performing transmission of the packets, each of the packets having a first sequence number indicating a reproduction order of the packet;
a second step of receiving a retransmission request for a retransmission packet;
a third step of judging whether retransmission of the packet, which packet is indicated by the received retransmission request, should be performed or not; and
a fourth step of performing, on a basis of the judgment result, transmission of the retransmission packet having a first sequence number indicating a reproduction order of the packet, and a second sequence number indicating a transmission order, which can be used to judge a transmission error in the transmitted retransmission packet.
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Abstract
A data transmission apparatus including a receiving unit for receiving transmitted packets; a priority decision unit; a retransmission packet storage unit; a retransmission instruction receiving unit for receiving a retransmission request from a terminal at the receiving end; a retransmission decision unit; a transmission queue management unit; and a transmission unit.
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Citations
20 Claims
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1. A data transmission method for transmitting data in units of packets, said method comprising:
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a first step of performing transmission of the packets, each of the packets having a first sequence number indicating a reproduction order of the packet; a second step of receiving a retransmission request for a retransmission packet; a third step of judging whether retransmission of the packet, which packet is indicated by the received retransmission request, should be performed or not; and a fourth step of performing, on a basis of the judgment result, transmission of the retransmission packet having a first sequence number indicating a reproduction order of the packet, and a second sequence number indicating a transmission order, which can be used to judge a transmission error in the transmitted retransmission packet. - View Dependent Claims (2, 3, 4, 5)
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6. A data transmission method for receiving data in units of packets, said method comprising:
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a first step of detecting an occurrence of a transmission error in any of the packets, each of the packets having a first sequence number indicating a reproduction order of the packet; a second step of transmitting a retransmission request for a retransmission packet corresponding to one of the packets in which a transmission error has occurred; and a third step of performing reception of the retransmission packet which is transmitted on a basis of the retransmission request, the retransmission packet having a first sequence number indicating a reproduction order of the packet, and a second sequence number indicating a transmission order, which can be used to judge a transmission error in the transmitted retransmission packet. - View Dependent Claims (7, 8, 9, 10)
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11. A data transmission apparatus for transmitting data in units of packets, said apparatus comprising;
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a transmission unit for performing transmission of the packets, each of the packets having a first sequence number indicating a reproduction order of the packet; a retransmission instruction receiving unit for receiving a retransmission request for a retransmission packet; and a judgment unit for judging whether retransmission of the packet, which packet is indicated by the received retransmission request, should be performed or not; wherein said transmission unit performs transmission of the retransmission packet on a basis of the judgment result of the judgment unit, and wherein the retransmission packet has a first sequence number indicating a reproduction order of the packet, and a second sequence number indicating a transmission order, which can be used to judge a transmission error in the transmitted retransmission packet. - View Dependent Claims (12, 13, 14, 15)
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16. A data reception apparatus for receiving data in units of packets, said apparatus comprising:
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a detection unit for detecting an occurrence of a transmission error in any of the packets, each of the packets having a first sequence number indicating a reproduction order of the packet; a retransmission instruction output unit for transmitting a retransmission request for a retransmission packet; and a receiving unit for performing reception of the retransmission packet which is transmitted on a basis of the retransmission request; wherein the retransmission packet has a first sequence number indicating a reproduction order of the packet, and a second sequence number indicating a transmission order, which can be used to judge a transmission error in the transmitted retransmission packet. - View Dependent Claims (17, 18, 19, 20)
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Specification