Communication apparatus and handover control method
First Claim
1. A communication apparatus comprising:
- a first wireless functional unit which includes a first transmitter for transmitting data through a first wireless network and a first receiver for receiving data through the first wireless network;
a second wireless functional unit which includes a second transmitter for transmitting data through a second wireless network and a second receiver for receiving data through the second wireless network; and
a connection unit for connecting the first wireless functional unit and the second wireless functional unit to a computer;
wherein;
the communication apparatus controls the first wireless functional unit and the second wireless functional unit in accordance with an instruction from the computer;
a transmitter and a receiver of a wireless functional unit connecting a current wireless network are activated, a transmitter of a wireless functional unit to be connecting a target wireless network which is a handover target is deactivated, a receiver of the wireless functional unit to be connecting the target wireless network is activated and the receivers regularly obtain the wireless quality of the current wireless network and the target wireless networkthe wireless functional unit connecting the current wireless network performs a data suppression process by a congestion avoidance algorithm when carrying out communication in a case where the wireless quality of the current wireless network is less than a predetermined threshold and the wireless quality of the target wireless network is more than a predetermined threshold;
the wireless functional unit connecting the current wireless network checks whether the protocol process is in progress after performing the data suppression process;
the wireless functional unit connecting the current wireless network performs the handover after being transitioned to a standby state in which the data transfer and the protocol process are not in progress in a case where the protocol process is not in progress;
the wireless functional unit connecting the current wireless network cancels the data suppression process by stopping the congestion avoidance algorithm, and deactivate the transmitter of the wireless functional unit connecting the current wireless network after the completion of the handover; and
the wireless functional unit to be connecting the target wireless network activates the transmitter and the receiver after the deactivation of the transmitter of the wireless functional unit connecting the current wireless network.
1 Assignment
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Accused Products
Abstract
It is provided a communication apparatus connected to first and second wireless networks which performs handover between the first and second wireless networks, including first and second wireless functional units which obtain connection states and wireless quality of the wireless networks. A transmitter and a receiver of the first wireless functional unit are activated, a transmitter of the second wireless functional unit is deactivated, a receiver of the second wireless functional unit is activated and the wireless quality of the first wireless network and the second wireless network are obtained when a connection between the first wireless functional unit and the first wireless network is in a connected state. The transmitter and the receiver of the first wireless functional unit are deactivated, the transmitter and the receiver of the second wireless functional unit are activated and the data suppression process is canceled after the completion of the handover.
12 Citations
8 Claims
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1. A communication apparatus comprising:
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a first wireless functional unit which includes a first transmitter for transmitting data through a first wireless network and a first receiver for receiving data through the first wireless network; a second wireless functional unit which includes a second transmitter for transmitting data through a second wireless network and a second receiver for receiving data through the second wireless network; and a connection unit for connecting the first wireless functional unit and the second wireless functional unit to a computer;
wherein;the communication apparatus controls the first wireless functional unit and the second wireless functional unit in accordance with an instruction from the computer; a transmitter and a receiver of a wireless functional unit connecting a current wireless network are activated, a transmitter of a wireless functional unit to be connecting a target wireless network which is a handover target is deactivated, a receiver of the wireless functional unit to be connecting the target wireless network is activated and the receivers regularly obtain the wireless quality of the current wireless network and the target wireless network the wireless functional unit connecting the current wireless network performs a data suppression process by a congestion avoidance algorithm when carrying out communication in a case where the wireless quality of the current wireless network is less than a predetermined threshold and the wireless quality of the target wireless network is more than a predetermined threshold; the wireless functional unit connecting the current wireless network checks whether the protocol process is in progress after performing the data suppression process; the wireless functional unit connecting the current wireless network performs the handover after being transitioned to a standby state in which the data transfer and the protocol process are not in progress in a case where the protocol process is not in progress; the wireless functional unit connecting the current wireless network cancels the data suppression process by stopping the congestion avoidance algorithm, and deactivate the transmitter of the wireless functional unit connecting the current wireless network after the completion of the handover; and the wireless functional unit to be connecting the target wireless network activates the transmitter and the receiver after the deactivation of the transmitter of the wireless functional unit connecting the current wireless network. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A handover control method in a communication apparatus which is connected to a computer and controlled by the computer,
the communication apparatus including a first wireless functional unit which transmits and receives data through a first wireless network, and a second wireless functional unit which transmits and receives data through a second wireless network; -
the method, including the steps of; activating a transmitter and a receiver of a wireless functional unit connecting a current wireless network, deactivating a transmitter of a wireless functional unit to be connecting a target wireless network which is a handover target, activating a receiver of the wireless functional unit to be connecting the target wireless network and regularly obtaining wireless quality of the current wireless network and the target wireless network in a case of a handover between the first wireless network and the second wireless network; performing a data suppression process by a congestion avoidance algorithm when the wireless functional unit connecting the current wireless network is in communicating, in a case where the wireless quality of the current wireless network is less than a predetermined threshold and the wireless quality of the target wireless network is more than a predetermined threshold; checking whether the protocol process is in progress after performing the data suppression process after performing the data suppression process; performing the handover after being transitioned to a standby state in which the data transfer and the protocol process is not in progress in a case where the protocol process is not in progress; cancelling the data suppression process by stopping the congestion avoidance algorithm, and deactivate the transmitter of the wireless functional unit connecting the current wireless network after the completion of the handover; and activating the transmitter and the receiver of the wireless functional unit to be connecting the target wireless network after the deactivation of the transmitter of the wireless functional unit connecting the current wireless network.
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Specification