Packet retransmission control method and apparatus in multicast communication
AssigneeFujitsu Limited
InventorsAtsuko TADA, Ryuta TANAKA, Takashi HAMANO
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Abstract
In a multicast distribution system in which terminal devices on a distribution path are hierarchically grouped, a first terminal device which has detected a loss of a receiving packet transmits to a second terminal device located upstream of the first terminal device a retransmission request for a packet retransmission to the first terminal device and a third terminal device which receives a packet first in a group located downstream of a group to which the first terminal device belongs. The second terminal device which has received the retransmission request transmits a retransmission packet to both the first and third terminal devices.
Claims6
A method for performing retransmission control when a packet is lost in a multicast distribution system in which terminal devices on a distribution path are hierarchically grouped, comprising:
- transmitting from a first terminal device which has detected a loss of a receiving packet to a second terminal device located upstream of the first terminal device a retransmission request for a packet retransmission to the first terminal device and a third terminal device which receives a packet first in a group located downstream of a group to which the first terminal device belongs;
- and
- transmitting a retransmission packet from the second terminal device which has received the retransmission request to both the first and third terminal devices.
An apparatus which performs retransmission control when a packet is lost in a multicast distribution system in which terminal devices on a distribution path are hierarchically grouped, comprising:
- a retransmission request transmission unit configured to transmit a retransmission request for a packet retransmission to the apparatus and a terminal device that first receives a packet in a group located downstream of a group to which the apparatus belongs, to a terminal device located upstream of the apparatus when a loss of a receiving packet is detected;
- and
- a retransmission packet transmission unit configured to transmit a retransmission packet to each terminal device specified as a retransmission destination by the retransmission request when the retransmission request is received.
Dependencies are inferred from the claim text.