METHOD FOR SENSOR NODE ROAMING IN WIRELESS SENSOR NETWORK ENVIRONMENT
First Claim
1. A method for mobile sensor node roaming in an environment of first and second adjacent wireless sensor networks having a plurality of sensor nodes, the method comprising the steps of:
- (a) periodically performing energy detection scan and active scan operations, at the mobile sensor node forming an association with a parent node of the first wireless network, and obtaining energy values of selected channels and link quality indications (LQIs) for the channels;
(b) when the sensor node moves to the second wireless sensor network, periodically performing energy detection scan and active scan operations, at the sensor node, and obtaining energy values of selected channels and link quality indications (LQIs) for the channels after movement;
(c) comparing, at the sensor node, the energy values and link quality indications (LQIs) of the selected channels before and after movement;
(d) when the selected channel energy values and link quality indications (LQIs) are larger after movement than before movement, forming, at the sensor node, an association with a parent node of the second wireless sensor network; and
(e) breaking off, at the sensor node, the association with the parent node of the first wireless sensor network.
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Abstract
Provided is a method for mobile sensor node roaming in an environment of first and second adjacent wireless sensor networks having a plurality of sensor nodes. The method includes the steps of: periodically performing energy detection scan and active scan operations, at the mobile sensor node forming an association with a parent node of the first wireless network, and obtaining energy values of selected channels and link quality indications (LQIs) for the channels; when the sensor node moves to the second wireless sensor network, periodically performing energy detection scan and active scan operations, at the sensor node, and obtaining energy values of selected channels and link quality indications (LQIs) for the channels after movement; comparing, at the sensor node, the energy values and link quality indications (LQIs) of the selected channels before and after movement; when the selected channel energy values and link quality indications (LQIs) are larger after movement than before movement, forming, at the sensor node, an association with a parent node of the second wireless sensor network; and breaking off, at the sensor node, the association with the parent node of the first wireless sensor network. Accordingly, this method for mobile sensor node roaming can promote the development of various wireless sensor network-based application services.
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Citations
12 Claims
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1. A method for mobile sensor node roaming in an environment of first and second adjacent wireless sensor networks having a plurality of sensor nodes, the method comprising the steps of:
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(a) periodically performing energy detection scan and active scan operations, at the mobile sensor node forming an association with a parent node of the first wireless network, and obtaining energy values of selected channels and link quality indications (LQIs) for the channels; (b) when the sensor node moves to the second wireless sensor network, periodically performing energy detection scan and active scan operations, at the sensor node, and obtaining energy values of selected channels and link quality indications (LQIs) for the channels after movement; (c) comparing, at the sensor node, the energy values and link quality indications (LQIs) of the selected channels before and after movement; (d) when the selected channel energy values and link quality indications (LQIs) are larger after movement than before movement, forming, at the sensor node, an association with a parent node of the second wireless sensor network; and (e) breaking off, at the sensor node, the association with the parent node of the first wireless sensor network. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for mobile sensor node roaming in an environment of a plurality of adjacent wireless sensor networks having a plurality of sensor nodes, the method comprising the steps of:
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(a′
) forming, at the sensor node, an association with a parent node of a wireless sensor network in which the sensor node is currently positioned through a periodic active scan operation;(b′
) selecting, at the sensor node, currently used channels by detecting energy values through a periodic energy detection scan operation, and obtaining link quality indications (LQIs) for the selected channels by periodically performing the active scan operation;(c′
) when the sensor node moves to a neighboring wireless sensor network, obtaining, at the sensor node, the energy values of the selected channels and the link quality indications (LQIs) for the channels by periodically performing energy detection scan and active scan operations; and(d′
) comparing, at the sensor node, the energy values and link quality indications (LQIs) for the selected channels before and after movement, and then forming an association with the parent node of the wireless sensor network before movement or a parent node of the wireless sensor network after movement according to the result of the comparison. - View Dependent Claims (8, 9)
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10. A method for mobile sensor node roaming in an environment of a plurality of adjacent wireless sensor networks having a plurality of sensor nodes, the method comprising the steps of:
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obtaining, at the sensor node, energy values of channels and link quality indications (LQIs) of each channel which change with movement through periodic energy detection scan and active scan operations; and comparing and analyzing, at the sensor node, the energy values of the channels and the link quality indications (LQIs) of each channel that are obtained, and forming an association with a parent node of the wireless sensor network before and after the movement. - View Dependent Claims (11, 12)
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Specification