ROUTING METHOD IN WIRELESS MULTI-HOP NETWORK AND COMMUNICATION TERMINAL
First Claim
1. A routing method in a wireless multi-hop network that exchanges between a plurality of communication terminals by radio a control packet including a Hello message which is a control message for discovering neighbor nodes to form a multi-hop network where each of the communication terminals serves as a node, retains topology information of the multi-hop network, and controls routes of packets exchanged between the communication terminals based on the topology information, the routing method comprising the steps of:
- suppressing the information amount of the Hello message at the time when the Hello message is transmitted at a predetermined transmission interval; and
setting the transmission interval to a transmission interval shorter than a Hello message transmission interval in a steady-state while the information amount of the Hello message is suppressed.
1 Assignment
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Accused Products
Abstract
A wireless multi-hop network communication terminal 11 uses a Hello information suppression function 21 to suppress a part of information included in a Hello message for a given time after start-up or a new neighbor terminal is detected, thereby reducing message length. Further, the communication terminal 11 uses a Hello interval adjustment function 22 to adjust and shorten a Hello interval during the suppression of the Hello message length. After canceling the suppression of the Hello message length, the communication terminal 11 calculates and establishes a second Hello interval that is shorter than the usual one. Furthermore, after canceling the second Hello interval, the communication terminal 11 reestablishes the steady-state Hello interval. In this way, the time required for the route convergence among the communication terminals can be shortened when a large number of communication terminals, which are adjacent to one another in a narrow-band wireless network and existent within a wireless communication range, are started up at the same time or when a new communication terminal is added to the network.
19 Citations
27 Claims
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1. A routing method in a wireless multi-hop network that exchanges between a plurality of communication terminals by radio a control packet including a Hello message which is a control message for discovering neighbor nodes to form a multi-hop network where each of the communication terminals serves as a node, retains topology information of the multi-hop network, and controls routes of packets exchanged between the communication terminals based on the topology information, the routing method comprising the steps of:
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suppressing the information amount of the Hello message at the time when the Hello message is transmitted at a predetermined transmission interval; and setting the transmission interval to a transmission interval shorter than a Hello message transmission interval in a steady-state while the information amount of the Hello message is suppressed. - View Dependent Claims (2, 3, 4)
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5. A routing method in a wireless multi-hop network that exchanges between a plurality of communication terminals by radio a control packet including a Hello message which is a control message for discovering neighbor nodes to form a multi-hop network where each of the communication terminals serves as a node, retains topology information of the multi-hop network, and controls routes of packets exchanged between the communication terminals based on the topology information, the routing method comprising the steps of:
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suppressing a part of information included in the Hello message to shorten Hello message length at the time when the Hello message is transmitted at a predetermined transmission interval; setting the transmission interval to a first transmission interval shorter than a Hello message transmission interval in a steady-state while the Hello message length is suppressed; transmitting the Hello message whose message length is suppressed at the first transmission interval; canceling the suppression of the Hello message length; setting the transmission interval to a second transmission interval after the suppression of the Hello message length has been canceled; transmitting the Hello message at the second transmission interval; canceling the second transmission interval; and resetting the transmission interval to a Hello message transmission interval in a steady-state after the second transmission interval has been canceled. - View Dependent Claims (6, 7, 8)
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9. A communication terminal used in a wireless multi-hop network that exchanges between a plurality of communication terminals by radio a control packet including a Hello message which is a control message for discovering neighbor nodes to form a multi-hop network where each of the communication terminals serves as a node, retains topology information of the multi-hop network, and controls routes of packets exchanged between the communication terminals based on the topology information, the communication terminal comprising:
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Hello information suppression means for suppressing the information amount of the Hello message at the time when the Hello message is transmitted at a predetermined transmission interval; and Hello interval setting means for setting the transmission interval to a transmission interval shorter than a Hello message transmission interval in a steady-state while the information amount of the Hello message is suppressed. - View Dependent Claims (10, 11, 12)
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13. A wireless multi-hop network that exchanges between a plurality of communication terminals by radio a control packet including a Hello message which is a control message for discovering neighbor nodes to form a multi-hop network where each of the communication terminals serves as a node, retains topology information of the multi-hop network, and controls routes of packets exchanged between the communication terminals based on the topology information, wherein
each of the plurality of communication terminals comprises: -
Hello information suppression means for suppressing the information amount of the Hello message at the time when the Hello message is transmitted at a predetermined transmission interval; and Hello interval setting means for setting the transmission interval to a transmission interval shorter than a Hello message transmission interval in a steady-state while the information amount of the Hello message is suppressed.
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14. An apparatus for controlling a route in a wireless multi-hop network that exchanges between a plurality of communication terminals by radio a control packet including a Hello message which is a control message for discovering neighbor nodes to form a multi-hop network where each of the communication terminals serves as a node, retains topology information of the multi-hop network, and controls routes of packets exchanged between the communication terminals based on the topology information, the apparatus comprising:
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Hello information suppression means for suppressing the information amount of the Hello message at the time when the Hello message is transmitted at a predetermined transmission interval; and Hello interval setting means for setting the transmission interval to a transmission interval shorter than a Hello message transmission interval in a steady-state while the information amount of the Hello message is suppressed.
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15. A program for controlling a route in a wireless multi-hop network that exchanges between a plurality of communication terminals by radio a control packet including a Hello message which is a control message for discovering neighbor nodes to form a multi-hop network where each of the communication terminals serves as a node, retains topology information of the multi-hop network, and controls routes of packets exchanged between the communication terminals based on the topology information, the program allowing a computer to execute the steps of:
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suppressing the information amount of the Hello message at the time when the Hello message is transmitted at a predetermined transmission interval; and setting the transmission interval to a transmission interval shorter than a Hello message transmission interval in a steady-state while the information amount of the Hello message is suppressed.
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16. A communication terminal used in a wireless multi-hop network that exchanges between a plurality of communication terminals by radio a control packet including a Hello message which is a control message for discovering neighbor nodes to form a multi-hop network where each of the communication terminals serves as a node, retains topology information of the multi-hop network, and controls routes of packets exchanged between the communication terminals based on the topology information, the communication terminal comprising:
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a Hello information suppression unit configured to suppress the information amount of the Hello message at the time when the Hello message is transmitted at a predetermined transmission interval; and a Hello interval setting unit configured to set the transmission interval to a transmission interval shorter than a Hello message transmission interval in a steady-state while the information amount of the Hello message is suppressed. - View Dependent Claims (17, 18, 19)
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20. A wireless multi-hop network that exchanges between a plurality of communication terminals by radio a control packet including a Hello message which is a control message for discovering neighbor nodes to form a multi-hop network where each of the communication terminals serves as a node, retains topology information of the multi-hop network, and controls routes of packets exchanged between the communication terminals based on the topology information, wherein
each of the plurality of communication terminals comprises: -
a Hello information suppression unit configured to suppress the information amount of the Hello message at the time when the Hello message is transmitted at a predetermined transmission interval; and a Hello interval setting unit configured to set the transmission interval to a transmission interval shorter than a Hello message transmission interval in a steady-state while the information amount of the Hello message is suppressed. - View Dependent Claims (21, 22, 23)
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24. An apparatus for controlling a route in a wireless multi-hop network that exchanges between a plurality of communication terminals by radio a control packet including a Hello message which is a control message for discovering neighbor nodes to form a multi-hop network where each of the communication terminals serves as a node, retains topology information of the multi-hop network, and controls routes of packets exchanged between the communication terminals based on the topology information, the apparatus comprising:
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a Hello information suppression unit configured to suppress the information amount of the Hello message at the time when the Hello message is transmitted at a predetermined transmission interval; and a Hello interval setting unit configured to set the transmission interval to a transmission interval shorter than a Hello message transmission interval in a steady-state while the information amount of the Hello message is suppressed. - View Dependent Claims (25, 26, 27)
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Specification