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US 2001/0043601 A1Published application
Packet communication system, mobile communication system, and addressing method for communication
AssigneeNEC Corporation
InventorsShigeki Yamano, Atsushi Iwata
Life of this patent
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Abstract
A broadcast group managing router (1) transmits a broadcast packet by attaching thereto a calculation type address which allows to arithmetically obtain a delivery destination by calculation, and each calculation type address calculating router (2 to 4) calculates the calculation type address so as to determine the delivery destination, to thereby conduct the broadcast communication.
Claims3
A packet communication system comprising:
- a plurality of terminals, and
- transferring means for transferring multicast packets written with the same information to said plurality of terminals;
- wherein said transferring means comprises:
- a broadcast group managing router provided with:
- holding means for holding calculation type addresses having bits “1” corresponding to those of said plurality of terminals to which a multicast packet is to be transferred, respectively;
- and assigning/sending means for assigning a pertinent calculation type address to a multicast packet and sends out the multicast packet;
- and
- at least one calculation type address calculating router provided with:
- holding means for holding directional route masks having bits “1” corresponding to those directional routes into which a multicast packet is to be transferred, respectively;
- and sending means for sending out a multicast packet to those directional routes which are given with logical products of “1” by the combination of each directional route mask and said assigned calculation type address;
- and
- wherein each of said plurality of terminals comprises:
- holding means for holding a terminal mask having a bit “1” corresponding to the terminal itself;
- and
- multicast packet receiving means for receiving a multicast packet which is given with a logical product of “1” by the combination of said terminal mask and said assigned calculation type address.
12 more elements
A mobile communication system comprising:
- a mobile terminal;
- a plurality of broadcast receiving routers communicated to said mobile terminal via radio link;
- encapsulating means for encapsulating a uni-cast packet destined to said mobile terminal into a multicast packet destined to said plurality of broadcast receiving routers;
- and
- transferring means for transferring the multicast packet;
- wherein said transferring means comprises:
- a mobile terminal position managing router provided with:
- holding means for holding calculation type addresses having bits “1” corresponding to those of said plurality of broadcast receiving routers to which a multicast packet is to be transferred, respectively;
- and assigning/sending means for assigning a pertinent calculation type address to a multicast packet and sends out the multicast packet;
- and
- at least one calculation type address calculating router provided with:
- holding means for holding directional route masks having bits “1” corresponding to those directional routes into which a multicast packet is to be transferred, respectively;
- and sending means for sending out a multicast packet to those directional routes which are given with logical products of “1” by the combination of each directional route mask and said assigned calculation type address;
- and
- wherein each of said plurality of broadcast receiving routers comprises:
- holding means for holding a terminal mask having a bit “1” corresponding to the terminal itself;
- multicast packet receiving means for receiving a multicast packet which is given with a logical product of “1” by the combination of said terminal mask and said assigned calculation type address;
- and
- de-capsulating means for de-capsulating the received multicast packet into a uni-cast packet destined to said mobile terminal.
16 more elements
An addressing method for communication, comprising:
- at least one calculation type address having bits “1” corresponding to destinations to which a multicast packet is to be transferred;
- at least one directional route mask having bits “1” corresponding to those directional routes into which a multicast packet is to be transferred;
- and
- at least one terminal mask having a bit “1” corresponding to that destination which is to receive the multicast packet.
1 more element
Dependencies are inferred from the claim text.