Sensor node device and method for supporting mobility of mobile node in sensor network
First Claim
1. A sensor node device for supporting mobility of a mobile node in a sensor network, the sensor node device comprising:
- a network interface for communicating with a sink node, at least one neighboring sensor node, and the mobile node;
a mobility supervisor for detecting a location of the mobile node, and deciding a sensor node for a service of a data packet received through the network interface on the basis of the detected location;
a transmission decision maker for deciding a transmission mode for the data packet received through the network interface according to the location of the mobile node; and
a state reporter for reporting a transmission state of the data packet through the sensor node device.
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Accused Products
Abstract
Provided are a sensor node device and method for supporting mobility of a mobile node in a sensor network. The sensor node device includes: a network interface for communicating with a sink node, at least one neighboring sensor node, and the mobile node; a mobility supervisor for detecting a location of the mobile node, and deciding a sensor node for a service of a data packet received through the network interface on the basis of the detected location; a transmission decision maker for deciding a transmission mode for the data packet received through the network interface according to the location of the mobile node; and a state reporter for reporting a transmission state of the data packet through the sensor node device. When the mobile node moves to a place where radio wave propagation areas of sensor nodes overlap each other, the radio wave intensity of each sensor node is detected to perform a handoff to the sensor node of the area having the strongest radio wave intensity. Thus, a ping-pong problem caused by unnecessary repeated handoff, and a delay problem caused by too slow handoff, can be prevented.
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Citations
20 Claims
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1. A sensor node device for supporting mobility of a mobile node in a sensor network, the sensor node device comprising:
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a network interface for communicating with a sink node, at least one neighboring sensor node, and the mobile node;
a mobility supervisor for detecting a location of the mobile node, and deciding a sensor node for a service of a data packet received through the network interface on the basis of the detected location;
a transmission decision maker for deciding a transmission mode for the data packet received through the network interface according to the location of the mobile node; and
a state reporter for reporting a transmission state of the data packet through the sensor node device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for supporting mobility of a mobile node in a sensor network, the method comprising the steps of:
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determining, by the mobile node, whether or not sensor switching is required using a Received Signal Strength Indication (RSSI) of each sensor node and a threshold value;
when it is determined that sensor switching is required, deciding a target sensor node using the RSSI of each sensor node and the threshold value;
performing a handoff to the decided target sensor node;
setting an optimal route through the decided target sensor node; and
transmitting/receiving a data packet using the set optimal route. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for processing handoff of a mobile node in a sensor network, the method comprising the steps of:
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measuring a Received Signal Strength Indication (RSSI) of each neighboring sensor node using an Advertisement message periodically transmitted from each neighboring sensor node;
determining whether or not there is a neighboring sensor node whose measured RSSI exceeds a preset threshold value;
when it is determined that there is a neighboring sensor node whose measured RSSI exceeds the preset threshold value, measuring the RSSI of a source sensor node performing a current data packet service;
when the measured RSSI of the source sensor node does not exceed the threshold value, transmitting a Pre-forwarding message to the source sensor node and deciding as a target sensor node the sensor node having the strongest RSSI among the neighboring sensor nodes;
transmitting a Rerouting Request message to the target sensor node; and
when the Rerouting Request message is received from the target sensor node, transmitting/receiving a data packet through the target sensor node. - View Dependent Claims (19, 20)
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Specification