MULTICAST SERVICE PROVIDING SYSTEM, MULTICAST SERVICE PROVIDING METHOD, INFORMATION DISTRIBUTOR, RADIO TERMINAL, AND RADIO BASE STATION

Title:

MULTICAST SERVICE PROVIDING SYSTEM, MULTICAST SERVICE PROVIDING METHOD, INFORMATION DISTRIBUTOR, RADIO TERMINAL, AND RADIO BASE STATION

Document Type and Number:

WIPO Patent Application WO/2001/080590

Kind Code:

A1

Abstract:

A multicast service providing system for providing a distribution service of multicast information from an information distributor to a radio terminal in a service area through a radio section, in which the radio terminal has service continuation request means for transmitting a service continuation request signal for requesting continuation of a distribution service of multicast information to the information distributor. The information distributor has service continuation managing means for managing a request for the multicast information distribution service continuation from the radio terminal and transmits information representing whether or not a request for continuation of multicast information distribution service managed by the service continuation managing means is made to the radio terminal.

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Inventors:

SATO HIJIN (JP)
SHIMADA KOBARUTO (JP)
TAKAO TOSHIAKI (JP)
UMEDA NARUMI (JP)

Application Number:

PCT/JP2001/003163

Publication Date:

October 25, 2001

Filing Date:

April 12, 2001

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Assignee:

NTT DOCOMO INC (JP)
SATO HIJIN (JP)
SHIMADA KOBARUTO (JP)
TAKAO TOSHIAKI (JP)
UMEDA NARUMI (JP)

International Classes:

H04L12/18; H04L12/28; H04L12/56; H04W76/04; H04W4/06; H04W36/08; (IPC1-7): H04Q7/38; H04L12/18

Foreign References:

JP2000032007A	2000-01-28
JP2000175263A	2000-06-23
JPH1132370A	1999-02-02
EP0951198A2	1999-10-20

Other References:

FENNER W: "Internet Group Management Protocol, Version 2", IETF REQUEST FOR COMMENTS, XX, XX, NO. RFC 2236, 1 November 1997 (1997-11-01), pages 1 - 24
See also references of EP 1185125A4

Attorney, Agent or Firm:

Itoh, Tadahiko (Yebisu Garden Place Tower 20-3 Ebisu 4-chome Shibuya-ku, Tokyo, JP)

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