Ntt Docomo, Inc.

Kobaruto Shimada

Narumi Umeda

Hijin Sato

Toshiaki Takao

In a wireless base station, when a newly provided control unit receives an IP packet from one mobile station (), it refers to a destination address in control information added to the IP packet (), and determines whether the IP packet is one to be broadcast or multicast (). If the value of destination address is at a value indicative of broadcasting or the like defined by IP, the IP packet is copied according to the subnet, and is sent back to a wireless link layer processor with its contents intact (). Further, the wireless link layer processor is commanded to broadcast the sent-back IP packet in a wireless area and so forth (), whereby the IP packet can be broadcast into a cell and so forth.

Mobile communication system, mobile communication method, wireless base station, mobile station, and program

The present invention is configured such that, in a multicast service providing system in which multicast information distribution service is made from an information distributing apparatus to radio terminals present within a service area via a radio section, the radio terminal has service continuation request signal transmitting a service continuation request signal for requesting continuation of the multicast information distribution service to the information distributing apparatus, the information distributing apparatus has service continuation management means managing as to whether or not request for the service continuation has been made by the radio terminal for the multicast information distribution service, and the information distributing apparatus transmits information indicating as to whether or not continuation request has been made for the multicast information distribution service managed by the service continuation management means.

Multicast service providing system, multicast service providing method, information distributor, radio terminal, and radio base station

One preferred embodiment of the invention provides a wireless base station which provides a multicasting service to simultaneously transmit identical data to a plurality of wireless terminals. A wireless base station is connected to a plurality of wireless terminals and provides a multicasting service for a plurality of wireless terminals. The wireless base station determines autonomously whether it provides the multicasting service for the plurality of wireless terminals. Another preferred embodiment of the invention provides a method of selecting a wireless base station for a wireless terminal, the wireless base station providing a multicasting service for the wireless terminal. When the wireless terminal can receive the same multicasting information from a plurality of wireless base stations, the wireless terminal selects one of the plurality of wireless base stations so as to make the number of the wireless base stations that send the same multicasting information as small as possible.

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Yokosuka, Japan

Kobaruto Shimada