Location sensing system and method for mobile communication system
First Claim
1. A location sensing method for a mobile communication system, comprising the steps of:
- (a) discovering, by a source mobile node, anchor nodes within a predefined vicinity;
(b) discovering neighbor mobile nodes, when a number of discovered anchor nodes is fewer than a predetermined number of reference nodes required for location sensing, discovering neighbor mobile nodes includes;
(i) broadcasting a device discovery request message to the neighbor mobile nodes; and
(ii) receiving device discovery response messages from the neighbor mobile nodes in response to the device discovery request message;
(c) selecting at least one neighbor mobile node as a reference mobile node in conjunction with the discovered anchor nodes, the reference mobile node selected with reference to measurement information contained in the device discovery response messages in step (ii);
(d) computing a location of the source mobile node in cooperation with the predetermined number of reference nodes including the discovered anchor nodes and the reference mobile node;
wherein the measurement information comprise at least one of a standard deviation of measurements, a standard deviation of Received Signal Strength Indications (RSSIs) of anchor nodes, an average speed of the neighbor mobile node, and an acceleration of the source mobile node.
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Abstract
A location sensing system and method for a mobile communication system is provided for maintaining location sensing service with the support of mobile nodes when there is an insufficient number of anchor nodes for reference points. A location sensing method for a mobile communication system includes discovering, at a source mobile node, anchor nodes in a vicinity; discovering, when a number of discovered anchor nodes is less than a predetermined number of reference nodes required for location sensing, neighboring mobile nodes; selecting at least one of neighboring mobile nodes as a reference mobile node; and computing a location of the source mobile node in cooperation with the predetermined number of reference nodes including the discovered anchor nodes and the reference mobile node.
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Citations
18 Claims
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1. A location sensing method for a mobile communication system, comprising the steps of:
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(a) discovering, by a source mobile node, anchor nodes within a predefined vicinity; (b) discovering neighbor mobile nodes, when a number of discovered anchor nodes is fewer than a predetermined number of reference nodes required for location sensing, discovering neighbor mobile nodes includes; (i) broadcasting a device discovery request message to the neighbor mobile nodes; and (ii) receiving device discovery response messages from the neighbor mobile nodes in response to the device discovery request message; (c) selecting at least one neighbor mobile node as a reference mobile node in conjunction with the discovered anchor nodes, the reference mobile node selected with reference to measurement information contained in the device discovery response messages in step (ii); (d) computing a location of the source mobile node in cooperation with the predetermined number of reference nodes including the discovered anchor nodes and the reference mobile node; wherein the measurement information comprise at least one of a standard deviation of measurements, a standard deviation of Received Signal Strength Indications (RSSIs) of anchor nodes, an average speed of the neighbor mobile node, and an acceleration of the source mobile node. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A location sensing system for a mobile communication system, comprising:
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means for broadcasting a device discovery request message, when a source mobile node detects a lack of predetermined number of anchor nodes; means for receiving device discovery response messages transmitted by at least one neighbor mobile node positioned in a transmission range of the source mobile node; means for selecting one of the at least one neighbor mobile node as a reference mobile node on the basis of measurement information contained in the device discovery response messages; and means for computing a location of the source mobile node with support of the reference mobile node; wherein the measurement information comprises at least one of a standard deviation of measurements, a standard deviation of Received Signal Strength Indications (RSSIs) of anchor nodes, an average speed of neighbor mobile node, and an acceleration of neighbor mobile node. - View Dependent Claims (9, 10, 11, 12)
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13. A location sensing method for a mobile communication system, comprising:
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(a) broadcasting by a source mobile node, a device discovery request message, when a source mobile node detects less than a predetermined number of anchor nodes; (b) receiving by the source mobile node, a device discovery response message containing location information and measurement information to the source mobile node by neighbor mobile nodes which received the device discovery request message broadcast in (a); (c) analyzing, at the source mobile node, the location and measurement information contained in the received device discovery response messages; and (d) selecting at least one of the neighbor mobile nodes as a reference mobile node wherein the measurement information comprises at least one of a standard deviation of measurements, a standard deviation of Received Signal Strength Indications (RSSIs) of anchor nodes, an average speed of neighbor mobile node, and an acceleration of neighbor mobile node on the basis of analysis result. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification