Radio communication control station, radio communication terminal, home agent, and radio communication method
First Claim
1. A radio communication control station comprising:
- a packet receiver for receiving an IP packet destined for a radio communication terminal subscribing to one of sub-networks constituting a composite radio communication network;
a paging controller for causing one of the sub-networks to page the radio communication terminal;
a location information receiver for receiving location information on a current location of the radio communication terminal from the radio communication terminal; and
a retriever for retrieving candidates of sub-networks that can be employed by the radio communication terminal on the basis of the location information on the radio communication terminal.
1 Assignment
0 Petitions
Accused Products
Abstract
A radio communication control station including a packet receiver, a paging controller, a location information receiver, and a retriever. The packet receiver receives an IP packet destined for a radio communication terminal subscribing to one of sub-networks constituting a composite radio communication network. The paging controller causes one of the sub-networks to page the radio communication terminal. The location information receiver receives location information on a current location of the radio communication terminal from the radio communication terminal. The retriever retrieves candidates of sub-networks that can be employed by the radio communication terminal on the basis of the location information on the radio communication terminal. The radio communication terminal selects a sub-network for its use among from the candidates and establishes an environment for communication with the sub-network.
116 Citations
20 Claims
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1. A radio communication control station comprising:
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a packet receiver for receiving an IP packet destined for a radio communication terminal subscribing to one of sub-networks constituting a composite radio communication network;
a paging controller for causing one of the sub-networks to page the radio communication terminal;
a location information receiver for receiving location information on a current location of the radio communication terminal from the radio communication terminal; and
a retriever for retrieving candidates of sub-networks that can be employed by the radio communication terminal on the basis of the location information on the radio communication terminal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 17, 19, 20)
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12. A radio communication terminal comprising:
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a location information transmitter for acquiring location information on a current location of the radio communication terminal and transmitting the location information to a radio communication control station when the radio communication terminal has been paged by the radio communication control station in one of sub-networks constituting a composite radio communication network;
a selector for selecting a sub-network, which the radio communication terminal utilizes, from candidates of sub-networks available for the radio communication terminal once receiving information on the candidates of sub-networks;
a setter for setting up a communication mechanism to be matched with the selected sub-network; and
a negotiator for negotiating with the selected sub-network for establishing an environment of communication between the selected sub-network and the radio communication terminal.
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16. A home agent provided in a sub-network of a composite radio communication network, and supervising, receiving, and transferring IP packets destined for radio communication terminals subscribing to the sub-network, the home agent comprising a transferrer that transfers an IP packet to a destination terminal using an IP address inherent in the destination terminal without transferring the IP packet to another sub-network when the destination terminal exists effectively in the sub-network where the home agent is provided and the inherent IP address can be used in the sub-network, the transferrer transferring an IP packet to a radio communication control station provided in the composite radio communication network when the destination terminal does not effectively exist in any sub-networks constituting the composite radio communication network, the transferrer using a temporary IP address to transfer IP packets received after the destination terminal obtains the temporary IP address that is effective in a visited sub-network different from the network at which the home agent is provided.
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18. A radio communication method comprising:
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receiving an IP packet destined for a radio communication terminal subscribing to one of sub-networks constituting a composite radio communication network;
causing one of the sub-networks to page the radio communication terminal;
receiving location information on a current location of the radio communication terminal from the radio communication terminal; and
retrieving candidates of sub-networks that can be employed by the radio communication terminal on the basis of the location information on the radio communication terminal.
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Specification