Network system using dedicated downlink network and bidirectional network
First Claim
1. A network system, comprising:
- a radio terminal having a first communication interface usable for reception only and a second communication interface usable for transmission and reception;
a first sub-network to which the radio terminal can be connected through a radio base station of a downlink radio network by using the first communication interface;
a second sub-network to which the radio terminal can be connected through a bidirectional communication network by using the second communication interface, the second sub-network being connected with the first sub-network through a backbone network; and
a packet relay device configured to receive a request message requesting a protocol processing with respect to the first sub-network from the radio terminal through the second sub-network, and carry out the protocol processing on the first sub-network according to the request message on behalf of the radio terminal, such that a response message corresponding to the request message obtaining by the protocol processing is returned from the first sub-network to the radio terminal through the downlink radio network or the bidirectional communication network.
1 Assignment
0 Petitions
Accused Products
Abstract
A packet relay device for processing a request message of a prescribed protocol on behalf of a radio terminal is provided at a first sub-network which is capable of communications in the downlink direction with respect to the radio terminal only. Then, a request message encapsulated in an IP packer is transferred from the radio terminal to the packet relay device through the second sub-network which is capable of communications in both uplink direction and the downlink direction with respect to the radio terminal, and a response message corresponding to the request message is transferred from the packet relay device to the radio terminal, so that it becomes possible for the radio terminal to execute a prescribed protocol with respect to the first sub-network.
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Citations
20 Claims
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1. A network system, comprising:
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a radio terminal having a first communication interface usable for reception only and a second communication interface usable for transmission and reception;
a first sub-network to which the radio terminal can be connected through a radio base station of a downlink radio network by using the first communication interface;
a second sub-network to which the radio terminal can be connected through a bidirectional communication network by using the second communication interface, the second sub-network being connected with the first sub-network through a backbone network; and
a packet relay device configured to receive a request message requesting a protocol processing with respect to the first sub-network from the radio terminal through the second sub-network, and carry out the protocol processing on the first sub-network according to the request message on behalf of the radio terminal, such that a response message corresponding to the request message obtaining by the protocol processing is returned from the first sub-network to the radio terminal through the downlink radio network or the bidirectional communication network. - View Dependent Claims (2)
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3. A packet relay device for use in a network system containing a radio terminal having a first communication interface usable for reception only and a second communication interface usable for transmission and reception, a first sub-network to which the radio terminal can be connected through a radio base station of a downlink radio network by using the first communication interface, and a second sub-network to which the radio terminal can be connected through a bidirectional communication network by using the second communication interface, the second sub-network being connected with the first sub-network through a backbone network, the packet relay device comprising:
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a communication interface configured to receive an encapsulated IP packet containing a request message requesting a protocol processing with respect to the first sub-network, which is transferred from the radio terminal located in a radio area of the radio base station through the second sub-network;
a processing unit configured to decapsulate the encapsulated IP packet received by the communication interface so as to take out the request message, and carry out the protocol processing on the first sub-network according to the request message on behalf of the radio terminal. - View Dependent Claims (4, 5, 6, 7)
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8. A radio terminal for use in a network system containing a first sub-network to which the radio terminal can be connected through a radio base station of a downlink radio network, a second sub-network to which the radio terminal can be connected through a bidirectional communication network, the second sub-network being connected with the first sub-network through a backbone network, and a packet relay device for carrying out a protocol processing on the first sub-network on behalf of the radio terminal, the radio terminal comprising:
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a first communication interface usable for reception only, by which the radio terminal can be connected to the first sub-network, which is configured to receive a notification message indicating an existence or an address of the packet relay device on the first sub-network through the downlink radio network when the radio terminal enters a radio area of the radio base station;
a second communication interface usable for transmission and reception, by which the radio terminal can be connected to the second sub-network, which is configured to transmit a request message requesting a protocol processing with respect to the first sub-network after receiving the notification message at the first communication interface, by encapsulating the request message into an IP (Internet Protocol) packet destined to the address of the packet relay device obtained according to the notification message and transmitting the IP packet through the second sub-network; and
a processing unit configured to process a response message corresponding to the request message obtained by the protocol processing. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A packet processing method in a network system containing a radio tarrying out the protocol processing o network according to the request message on behalf of the radio terminal at the packet relay device;
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returning a response message corresponding to the request message obtained by the protocol processing from the first sub-network to the radio terminal through the downlink radio network or the bidirectional communication network. - View Dependent Claims (16)
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17. A packet processing method at a packet relay device in a network system containing a radio terminal having a first communication Interface usable for reception only and a second communication interface usable for transmission and reception, a first sub-network to which the radio terminal can be connected through a radio base station of a downlink radio network by using the first communication interface, a second sub-network to which the radio terminal can be connected through a bidirectional communication network by using the second communication Interface, and the second sub-network being connected with the first sub-network through a backbone network, the method comprising:
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receiving an encapsulated IP packet containing a request message requesting a protocol processing with respect to the first sub-network, which is transferred from the radio terminal located in a radio area of the radio base station through the second sub-network; and
decapsulatlng the encapsulated IP packet received by the receiving step so as to take out the request message, and carrying out the protocol processing on the first sub-network according to the request message on behalf of the radio terminal.
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18. A packet processing method at a radio terminal in a network system containing a first sub-network to which the radio terminal can be connected through a radio base station of a downlink radio network, a second sub-network to which the radio terminal can be connected through a bidirectional communication network, the second sub-network being connected with the first sub-network through a backbone network, and a packet relay device for carrying out a protocol processing on the first sub-network on behalf of the radio terminal, the method comprising:
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receiving a notification message indicating an existence or an address of the packet relay device on the first sub-network through the downlink radio network when the radio terminal enters a radio area of the radio base station, using a first communication interface usable for reception only, by which the radio terminal can be connected to the first sub-network;
transmitting a request message requesting a protocol processing with respect to the first sub-network after receiving the notification message at the first communication interface, by encapsulating the request message into an IP (Internet Protocol) packet destined to the address of the packet relay device obtained according to the notification message and transmitting the IP packet through the second sub-network, using a second communication interface usable for transmission and reception, by which the radio terminal can be connected to the second sub-network; and
processing a response message corresponding to the request message obtained by the protocol processing.
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19. A computer usable medium having computer readable program codes embodied therein for causing a computer to function as a packet relay device in a network system containing a radio terminal having a first communication interface usable for reception only and a second communication interface usable for transmission and reception, a first sub-network to which the radio terminal can be connected through a radio base station of a downlink radio network by using the first communication interface, and a second sub-network to which the radio terminal can be connected through a bidirectional communication network by using the second communication interface, the second sub-network being connected with the first sub-network through a backbone network, the computer readable program codes include:
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a first computer readable program code for causing said computer to receive an encapsulated IP packet containing a request message requesting a protocol processing with respect to the first sub-network, which is transferred from the radio terminal located In a radio area of the radio base station through the second sub-network; and
a second computer readable program code for causing said computer to decapsulate the encapsulated IP packet received by the first computer readable program code so as to take out the request message, and carry out the protocol processing on the first sub-network according to the request message on behalf of the radio terminal.
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20. A computer usable medium having computer readable program codes embodied therein for causing a computer to function as a radio terminal in a network system containing a first sub-network to which the radio terminal can be connected through a radio base station of a downlink radio network, a second sub-network to which the radio terminal can be connected through a bidirectional communication network, the second sub-network being connected with the first sub-network through a backbone network, and a packet relay device for carrying out a protocol processing on the first sub-network on behalf of the radio terminal, the computer readable program codes include:
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a first computer readable program code for causing said computer to receive a notification message indicating an existence or an address of the packet relay device on the first sub-network through the downlink radio network when the radio terminal enters a radio area of the radio base station, using a first communication interface usable for reception only, by which the radio terminal can be connected to the first sub-network;
a second computer readable program code for causing said computer to transmit a request message requesting a protocol processing with respect to the first sub-network after receiving the notification message at the first communication interface, by encapsulating the request message into an IP (Internet Protocol) packet destined to the address of the packet relay device obtained according to the notification message and transmitting the IP packet through the second sub-network, using a second communication interface usable for transmission and reception, by which the radio terminal can be connected to the second sub-network; and
a third computer readable program code for causing said computer to process a response message corresponding to the request message obtained by the protocol processing.
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Specification