Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Reexamination Certificate
2004-03-26
2008-07-15
Marcelo, Melvin (Department: 2616)
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
C370S338000, C370S400000, C370S401000
Reexamination Certificate
active
07400601
ABSTRACT:
It is an object of the present invention to provide a mobile communication system capable of shortening a delay time preceding the reception of a multicast packet at a radio base station which has been reached by a movement of a mobile terminal. The mobile communication system includes a multicast router, a data layer link switch, a radio base station, and a mobile terminal. In cases where the mobile terminal detects switching of the radio base station but does not detect switching of the multicast router, a path establishing request, a withdrawal request, and another path establishing request are sequentially output. When the switching of the radio base station and the switching of the multicast router is detected, a path establishing request is transmitted to the new multicast router, and a withdrawal request is transmitted to the previous multicast router thereafter.
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Atsumi Yukio
Moritani Yuki
Faroul Farah
Marcelo Melvin
NTT DoCoMo Inc.
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