Network system, gateway, radio terminal, and recording medium
First Claim
1. A network system comprising a plurality of internal networks and radio terminals belonging to each of said internal networks, wherein:
- said radio terminals perform communication with radio terminals belonging to another internal network;
each of said internal networks comprises communication networks, a gateway for connecting said communication networks to Internet, and said radio terminals connected to said communication networks;
each of said radio terminals has identification information that is defined unique in all of said internal networks;
said gateway has a global IP address on the Internet, and includes an address managing table which stores each radio terminal belonging to said internal network in association with the global IP address of said gateway of said internal network to which said radio terminal belongs;
said radio terminals perform communication via said communication network by specifying each other by said identification information;
when said gateway receives information in which identification information of a radio terminal in another internal network is designated as a destination address from a radio terminal via said communication network, it refers to the address managing table to find the global IP address assigned to said gateway of said internal network to which said radio terminal having said destination address belongs, and sends the received information to the Internet to reach the found global IP address; and
when said gateway receives information in which the global IP address of said gateway itself is designated as a destination address from the Internet, it sends the received information via said communication network to a radio terminal which is specified by identification information included in the received information.
1 Assignment
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Accused Products
Abstract
In data communication utilizing amateur radio, communication via Internet can be performed.
A radio terminal belonging to an internal network can communicate with a radio terminal belonging to another internal network via the Internet. Each radio terminal has a callsign, and a gateway has a global IP address and a table which associates each radio terminal with the global IP address of a corresponding gateway. When receiving from a radio terminal, information addressed to a radio terminal in another internal network, the gateway sends the received information to the Internet by addressing it to the global IP address of the gateway of the internal network to which the destination radio terminal 33 belongs with reference to the table. When receiving information from the Internet, the gateway sends the received information to a radio terminal specified by the callsign of a receiver.
229 Citations
21 Claims
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1. A network system comprising a plurality of internal networks and radio terminals belonging to each of said internal networks, wherein:
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said radio terminals perform communication with radio terminals belonging to another internal network;
each of said internal networks comprises communication networks, a gateway for connecting said communication networks to Internet, and said radio terminals connected to said communication networks;
each of said radio terminals has identification information that is defined unique in all of said internal networks;
said gateway has a global IP address on the Internet, and includes an address managing table which stores each radio terminal belonging to said internal network in association with the global IP address of said gateway of said internal network to which said radio terminal belongs;
said radio terminals perform communication via said communication network by specifying each other by said identification information;
when said gateway receives information in which identification information of a radio terminal in another internal network is designated as a destination address from a radio terminal via said communication network, it refers to the address managing table to find the global IP address assigned to said gateway of said internal network to which said radio terminal having said destination address belongs, and sends the received information to the Internet to reach the found global IP address; and
when said gateway receives information in which the global IP address of said gateway itself is designated as a destination address from the Internet, it sends the received information via said communication network to a radio terminal which is specified by identification information included in the received information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A gateway for connecting an internal network to Internet, in a network system in which a plurality of internal networks are connected to each other via the Internet, and radio terminals belonging to each internal network perform communication with radio terminals in another internal network via the Internet, wherein:
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said gateway has a global IP address on the Internet, and includes an address managing table which stores each radio terminal belonging to said internal network in association with the global IP address of said gateway of said internal network to which said radio terminal belongs, and said gateway comprises;
external sending means for referring to the address managing table when receiving information in which identification information of a radio terminal in an internal network independent from said gateway is designated as a destination address from a radio terminal via a communication network, finding the global IP address assigned to said gateway of said internal network to which said radio terminal specified by the identification information belongs, and sending the received information to the Internet by addressing the received information to the found global IP address; and
internal sending means for, when receiving information in which the global IP address of said gateway itself is designated as a destination address from the Internet, sending the received information to a radio terminal which is specified by identification information included in the received information via said communication network. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A radio terminal used in a network system in which a plurality of internal networks each comprise radio terminals, a repeater for performing radio communication with said radio terminals, and a gateway connected to said repeater via a communication cable, each of said internal networks is connected to Internet via said gateway, and each of said radio terminals performs communication with said radio terminal belonging to another internal network via said repeater, said gateway, and the Internet, said radio terminal comprising:
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radio communication means;
data communication means for sending and receiving data to and from data processing devices;
input means for receiving an input of identification information of a radio terminal to which data is to be sent; and
control means for affixing to data to be sent that is received from a data processing device by said data communication means, a radio header including a callsign of a repeater to which the data is to be sent, a callsign of a repeater from which the data is to be sent, a callsign of a radio terminal to which the data is to be sent, and a callsign of said radio terminal itself from which the data is to be sent based on the information input from said input means, and sending the data via said radio communication means to said repeater from which the data is to be sent, while when receiving data to which a radio header including a callsign of said radio terminal itself as a destination address is affixed from said repeater, removing the radio header from the received data, identifying a data processing device from a destination address included in the received data, and providing the received data to said identified data processing device, wherein when data is to be sent to a radio terminal in another internal network, said control means designates a callsign of said gateway in said internal network to which said radio terminal itself belongs as the callsign of a repeater to which the data is to be sent, and designates a callsign of said radio terminal to which the data is finally addressed as the callsign of a radio terminal to which the data is to be sent.
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20. A computer-readable recording medium storing a program for enabling a computer to realize a function of a gateway for connecting a plurality of internal networks to Internet, in a network system in which said internal networks are connected to each other via the Internet, and radio terminals belonging to each internal network perform communication with radio terminals belonging to another internal network, wherein:
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said computer has a global IP address on the Internet, and includes an address managing table which stores each radio terminal in said internal network in association with the global IP address of said gateway of said internal network to which said radio terminal belongs; and
said program controls said computer to function as;
external sending means for referring to the address managing table when receiving information in which identification information of a radio terminal in an internal network independent from said gateway is designated as a destination address from a radio terminal via a communication network, finding the global IP address assigned to said gateway of said internal network to which said radio terminal specified by the identification information belongs, and sending the received information to the Internet by addressing the received information to the found global IP address; and
internal sending means for, when receiving information in which the global IP address of said gateway itself is designated as a destination address from the Internet, sending the received information to a radio terminal which is specified by identification information included in the received information via said communication network.
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21. A computer-readable recording medium storing a program for enabling a computer to realize a function of a radio terminal which is used in a network system in which a plurality of internal networks each comprise radio terminals, a repeater for performing radio communication with said radio terminals, and a gateway connected to said repeater via a communication cable, each of said internal networks is connected to Internet via said gateway, and each of said radio terminals performs communication with said radio terminal belonging to another internal network via said repeater, said gateway, and the Internet, said program controlling said computer to function as:
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radio communication means;
data communication means for sending and receiving data to and from data processing devices;
input means for receiving an input of identification information of a radio terminal to which data is to be sent; and
control means for affixing to data to be sent that is received from a data processing device by said data communication means, a radio header including a callsign of a repeater to which the data is to be sent, a callsign of a repeater from which the data is to be sent, a callsign of a radio terminal to which the data is to be sent, and a callsign of said radio terminal itself from which the data is to be sent based on the information input from said input means, and sending the data via said radio communication means to said repeater from which the data is to be sent, while when receiving data to which a radio header including a callsign of said radio terminal itself as a destination address is affixed from said repeater, removing the radio header from the received data, identifying a data processing device from a destination address included in the received data, and providing the received data to said identified data processing device, wherein when data is to be sent to a radio terminal in another internal network, said control means designates a callsign of said gateway in said internal network to which said radio terminal itself belongs as the callsign of a repeater to which the data is to be sent, and designates a callsign of said radio terminal to which the data is finally addressed as the callsign of a radio terminal to which the data is to be sent.
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Specification