Title:
放送チャネルを介するIPマルチキャスト・サービス
Document Type and Number:
Japanese Patent JP2005520370
Kind Code:
A
Abstract:
A method of and apparatus for providing an Internet Protocol multicast service wherein multicast data is transmitted through multicast routers (8) to user stations (9) over a digital broadcast channel (especially DVB-T) together with digital broadcast signals, at least if a request has been received from a user station (9) for the multicast data,. The transmission of the multicast data by a multicast router is conditional upon the reception of a request for said multicast data from that multicast router by a plurality of the user stations (9). The number of requests from the user stations (9) has to be greater than a threshold number, which is a function of the available bandwidth for multicast transmission over the broadcast channel. Information concerning the requests for the multicast data by the user stations (9) is unavailable to the other user stations (9).
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Inventors:
Garrec, david
Fabere, Referere
Benali, Amor
Fabere, Referere
Benali, Amor
Application Number:
JP2003533518A
Publication Date:
July 07, 2005
Filing Date:
September 11, 2002
Export Citation:
Assignee:
MOTOROLA INCORPORATED
International Classes:
H04L12/56; H04B7/26; H04L12/18; H04N7/24; (IPC1-7): H04L12/56; H04B7/26
Attorney, Agent or Firm:
Kazuo Shamoto
Tadashi Masui
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Hideo Tanaka
Tadashi Masui
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Hideo Tanaka