Tree-shaped broadcasting system, packet transmitting method, node device, and computer-readable medium
First Claim
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1. A node device for use in a tree-shaped broadcasting system including a plurality of node devices connected and located in a hierarchy, the node device comprising:
- a receiver configured to receive a plurality of packets of content data transmitted from a node located at one level higher in the hierarchy or a broadcasting device located at a top of the hierarchy;
a lost packet detector configured to detect a lost packet from the packets of the content data received by the receiver;
a packet complement request information transmitter configured to transmit packet complement request information to the node device located at one level higher in the hierarchy, the packet complement request information including a packet complementation request to complement the lost packet; and
a dummy packet transmitter configured to transmit a dummy packet to a node located at one level lower in the hierarchy instead of the lost packet, the dummy packet including information to delay transmission of the packet complement request information for a predetermined period of hold time.
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Abstract
A lost packet in a plurality of packets broadcasted from a broadcasting apparatus is detected. Packet complement request information indicative of a packet complement request for complementing the lost packet is transmitted to a device in a high hierarchical level, and a dummy packet for holding transmission of the packet complement request information for a predetermined hold time is transmitted in place of the lost packet to a node device connected in a low hierarchical level.
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Citations
7 Claims
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1. A node device for use in a tree-shaped broadcasting system including a plurality of node devices connected and located in a hierarchy, the node device comprising:
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a receiver configured to receive a plurality of packets of content data transmitted from a node located at one level higher in the hierarchy or a broadcasting device located at a top of the hierarchy; a lost packet detector configured to detect a lost packet from the packets of the content data received by the receiver; a packet complement request information transmitter configured to transmit packet complement request information to the node device located at one level higher in the hierarchy, the packet complement request information including a packet complementation request to complement the lost packet; and a dummy packet transmitter configured to transmit a dummy packet to a node located at one level lower in the hierarchy instead of the lost packet, the dummy packet including information to delay transmission of the packet complement request information for a predetermined period of hold time. - View Dependent Claims (2, 3, 4, 5)
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6. A Non-transitory computer readable medium having computer executable instructions for performing a method of controlling a node device for use in a tree-shaped broadcasting system including a plurality of node devices connected and located in a hierarchy, the method comprising the steps of:
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receiving a plurality of packets of content data transmitted from a node device located at one level higher in the hierarchy or a broadcasting device located at a top of the hierarchy; detecting a lost packet from the packets of the content data received; transmitting packet complement request information including a packet complementation request to complement the lost packet to the node device located at one level higher in the hierarchy; and transmitting a dummy packet to a node located at one level lower in the hierarchy instead of the lost packet.
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7. A method of controlling a node device for use in a tree-shaped broadcasting system including a plurality of node devices connected and located in a hierarchy, the method comprising the steps of:
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receiving a plurality of packets of content data transmitted from a node device located at one level higher in the hierarchy or a broadcasting device located at a top of the hierarchy; detecting a lost packet from the packets of the content data received; transmitting packet complement request information including a packet complementation request to complement the lost packet to the node device located at one level higher in the hierarchy; and transmitting a dummy packet to a node located at one level lower in the hierarchy instead of the lost packet.
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Specification