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Broadcast communicating apparatus, method and system, and program thereof, and program recording medium

A transmission method, multi-point technology, applied in transmission systems, digital transmission systems, error prevention/detection using return channels, etc., can solve the problems of unable to retrieve data, unable to receive terminals to access the multicast network, etc., Achieve the effect of preventing communication cost burden, improving security, and preventing communication load

Inactive Publication Date: 2005-07-20
PFU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, when multicast communication has already started, there is a new receiving terminal that accesses and receives multicast data just after the start of communication (newly added receiving terminal), but the new receiving terminal cannot regain data that has previously been multicast
Then, once the multicast communication starts, when the new receiving terminal needs complete data, it is actually impossible to connect the new receiving terminal to the multicast network during the communication

Method used

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  • Broadcast communicating apparatus, method and system, and program thereof, and program recording medium
  • Broadcast communicating apparatus, method and system, and program thereof, and program recording medium
  • Broadcast communicating apparatus, method and system, and program thereof, and program recording medium

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Embodiment Construction

[0030] BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 shows the structure of a multicast communication system or a multicast communication system including the multicast communication device of the present invention.

[0031] As shown in FIG. 1 , the multicast communication system has a multicast communication device 1 and a plurality of receiving terminals 3 . The multicast communication device 1 is a computer (or server) that sends data by multicast. Each receiving terminal 3 is a computer (or client) that receives data transmitted by the multicast device 1 by multicast. In this embodiment, multicasting is performed as a multicast communication over UDP / IP, allowing data (datagram packets) to flow freely over the network, while each time the data passes through a router (not shown) ) will copy them. Thus, the multicast communication device 1 is connected to a plurality of receiving terminals 3 via the multicast communication network 2 so that they constitute a multicast communic...

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Abstract

A broadcast communicating apparatus (1) comprises a broadcast communication processing part (11) for transmitting, via broadcast, one or more data to a plurality of receiver terminals (3); a retransmission request receiving part (12) for receiving a retransmission request that designates at least one of the one or more broadcasted data and that is received, via unicast, from any of the receiver terminals (3); and a retransmission processing part (13) for transmitting, via unicast, the data designated by the retransmission request to the receiver terminal (3) that transmitted the retransmission request.

Description

technical field [0001] The present invention relates to a multicast device, method, and system, its program, and a recording medium, and more particularly, to a multicast device and method capable of minimizing communication load due to retransmission of lost data in multicast and systems and their programs and recording media. Background technique [0002] When a sending terminal sends the same data to multiple receiving terminals (computers receiving data) at the same time (or in the process of multicast communication), the data is transmitted in the form of datagram packets (data units), where the data The correct order and completeness are not guaranteed. That is, multicast communication is independent of TCP / IP (Transmission Control Protocol / Internet Protocol) or protocols for point-to-point communication. Therefore, multicast communication cannot ensure the correct order and integrity of data. Specifically, multicast communication relies on UDP / IP (User Datagram Pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/16H04L12/18H04L12/70H04L12/811H04L29/08
CPCH04L12/1863
Inventor 荒屋吉恒松本英儿
Owner PFU LTD