Control device, handover control method and mobile communication system
First Claim
1. A control device, which constitutes a moving network including a plurality of mobile hosts, and a plurality of mutually connectable access interfaces each constituting a connection interface for a connection to a core network from a mobile host, and which serves to control a handover relating to the connection to the core network at the access interfaces, comprising:
- connection status acquiring means for acquiring information on a connection status to the core network at each access interface, from each access interface;
handover predicting means for predicting a subsequent handover on a basis of the information on the connection status to the core network at each access interface; and
changing means for dynamically changing a first access interface adopted as the connection interface for the mobile host to a second access interface in accordance with predetermined logic when a predetermined condition is satisfied on a basis of the information on the connection status to the core network at each access interface or prediction information for a subsequent handover,wherein, upon dynamically changing the first access interface to the second access interface, the mobile host remains connected to the first access interface that is not capable of maintaining a predetermined communication quality and is connected to the second access interface which is capable of maintaining the predetermined communication quality, the changing means issues an instruction for establishing a mutual communication connection between the first access interface and the second access interface, and the changing means continues to transmit and receive data to and from the first access interface through the second access interface via a communication link created in response to the instruction for establishing the mutual communication connection.
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Abstract
An object of the present invention is to avoid packet loss and implement a seamless handover by minimizing the handover latency when a handover is implemented by a multihomed moving network (MN) or a mobile host (MH). The present invention is a mobile communication system that is constituted comprising an MN, a plurality of AI each constituting an interface for the connection to a core network at the MN, and a control device (MMF), wherein the MMF dynamically changes the AI adopted as the connection interface when a predetermined condition is satisfied on the basis of the connection status to the core network at each AI or the prediction information for a subsequent handover. In so doing, the control device continues the transmission and receipt of data with respect to an appropriate AI capable of maintaining a predetermined communication quality, and maintains the connection to the core network of another AI while causing this AI to enter a closed state in which the transmission and receipt of data is disabled.
36 Citations
12 Claims
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1. A control device, which constitutes a moving network including a plurality of mobile hosts, and a plurality of mutually connectable access interfaces each constituting a connection interface for a connection to a core network from a mobile host, and which serves to control a handover relating to the connection to the core network at the access interfaces, comprising:
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connection status acquiring means for acquiring information on a connection status to the core network at each access interface, from each access interface; handover predicting means for predicting a subsequent handover on a basis of the information on the connection status to the core network at each access interface; and changing means for dynamically changing a first access interface adopted as the connection interface for the mobile host to a second access interface in accordance with predetermined logic when a predetermined condition is satisfied on a basis of the information on the connection status to the core network at each access interface or prediction information for a subsequent handover, wherein, upon dynamically changing the first access interface to the second access interface, the mobile host remains connected to the first access interface that is not capable of maintaining a predetermined communication quality and is connected to the second access interface which is capable of maintaining the predetermined communication quality, the changing means issues an instruction for establishing a mutual communication connection between the first access interface and the second access interface, and the changing means continues to transmit and receive data to and from the first access interface through the second access interface via a communication link created in response to the instruction for establishing the mutual communication connection. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A handover control method by a mobile communication system that includes a moving network comprising a plurality of mobile hosts, a plurality of mutually connectable access interfaces each constituting a connection interface for a connection to a core network from a mobile host, and a control device for controlling a handover relating to the connection to the core network at the access interfaces, the method comprising:
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acquiring, with an acquisition unit in the control device, information on a connection status to the core network at each access interface, from each access interface; predicting, with an handover prediction unit in the control device, a subsequent handover on a basis of the information on the connection status to the core network at each access interface; dynamically changing, with a change unit in the control device, a first access interface adopted as the connection interface for the mobile host to a second access interface device in accordance with predetermined logic when a predetermined condition is satisfied on a basis of the information on the connection status to the core network at each access interface or prediction information for a subsequent handover, wherein, upon dynamically changing the first access interface to the second access interface, the mobile host remains connected to the first access interface that is not capable of maintaining a predetermined communication quality and that is connected to the second access interface which is capable of maintaining the predetermined communication quality, the changing includes issuing an instruction for establishing a mutual communication connection between the first access interface and the second access interface; and controlling the control device to continue to transmit and receive data to and from the first access interface through the second access interface via a communication link created in response to the instruction for establishing the communication connection.
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11. A communication system, comprising:
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a moving network including a plurality of mobile hosts, and a plurality of mutually connectable access interfaces each constituting a connection interface to a core network from a mobile host; and a control device configured to control a handover relating to the connection to the core network at the access interfaces, said control device including connection status acquiring means for acquiring information on a connection status to the core network at each access interface, from each access interface, handover predicting means for predicting a subsequent handover on a basis of the information on the connection status to the core network at each access interface, and changing means for dynamically changing a first access interface adopted as the connection interface for the mobile host to a second access interface in accordance with predetermined logic when a predetermined condition is satisfied on a basis of the information on the connection status to the core network at each access interface or prediction information for a subsequent handover, wherein, upon dynamically changing the first access interface to the second access interface, the mobile host remains connected to the first access interface that is not capable of maintaining a predetermined communication quality and that is connected to the second access interface which is capable of maintaining the predetermined communication quality, the changing means issues an instruction for establishing a mutual communication connection between the first access interface and the second access interface, and the changing means continues to transmit and receive data to and from the first access interface through the second access interface via a communication link created in response to the instruction for establishing the mutual communication connection.
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12. A control device, which constitutes a moving network including a plurality of mobile hosts, and a plurality of mutually connectable access interfaces each constituting a connection interface for a connection to a core network from a mobile host, and which serves to control a handover relating to the connection to the core network at the access interfaces, comprising:
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a connection status acquiring unit configured to acquire information on a connection status to the core network at each access interface, from each access interface; a handover predicting unit configured to predict a subsequent handover on a basis of the information on the connection status to the core network at each access interface; and a changing unit configured to dynamically change a first access interface adopted as the connection interface for the mobile host to a second access interface in accordance with predetermined logic when a predetermined condition is satisfied on a basis of the information on the connection status to the core network at each access interface or prediction information for a subsequent handover, wherein, upon dynamically changing the first access interface to the second access interface, the mobile host remains connected to the first access interface that is not capable of maintaining a predetermined communication quality and that is connected to the second access interface which is capable of maintaining the predetermined communication quality, the changing unit issues an instruction for establishing a mutual communication connection between the first access interface and the second access interface, and the changing unit is configured to continue to transmit and receive data to and from the first access interface through the second access interface via a communication link created in response to the instruction for establishing the mutual communication connection.
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Specification