INDOOR POSITION DETERMINATION METHOD AND SYSTEM BASED ON WLAN SIGNAL STRENGTH
First Claim
1. An indoor position determination method based on WLAN (Wireless Local Area Network) signal strength, comprising:
- a remote monitoring step of collecting information about signal strength from a neighboring AP (Access Points) and generating an AP signal strength table;
a position information requesting step of receiving identification information and signal strength of a detected AP from a mobile terminal; and
a cell determination step of comparing a signal strength pattern of each AP received from the mobile terminal with a neighboring AP signal strength pattern of each AP with reference to the AP signal strength table and determining a cell having an AP with a most similar pattern as a cell where the mobile terminal is presently located.
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Abstract
An indoor position determination method and system based on WLAN signal strength using remote monitoring and cell space environmental attenuation is provided. The indoor position determination method includes a remote monitoring step of collecting information about signal strength from a neighboring AP and generating an AP signal strength table, a position information requesting step of receiving identification information and signal strength of a detected AP from a mobile terminal, and a cell determination step of comparing a signal strength pattern of each AP received from the mobile terminal with a neighboring AP signal strength pattern of each AP with reference to the AP signal strength table and determining a cell having an AP with a most similar pattern as a cell where the mobile terminal is presently located. Environmental attenuation is used instead of wall attenuation and floor attenuation, and locations of an AP and a mobile terminal in the same cell space may be may be simply estimated by applying the same environmental attenuation.
66 Citations
21 Claims
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1. An indoor position determination method based on WLAN (Wireless Local Area Network) signal strength, comprising:
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a remote monitoring step of collecting information about signal strength from a neighboring AP (Access Points) and generating an AP signal strength table; a position information requesting step of receiving identification information and signal strength of a detected AP from a mobile terminal; and a cell determination step of comparing a signal strength pattern of each AP received from the mobile terminal with a neighboring AP signal strength pattern of each AP with reference to the AP signal strength table and determining a cell having an AP with a most similar pattern as a cell where the mobile terminal is presently located. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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10. The indoor position determination method based on WLAN signal strength according to claim 7,
wherein the detailed position determining step includes calculating a distance from each AP to the mobile terminal in consideration of environmental attenuation from each AP to the mobile terminal, when using the triangular surveying, and wherein the environmental attenuation from each AP to the mobile terminal employs environmental attenuation from each AP to an AP installed in the cell where the mobile terminal is located. -
11. The indoor position determination method based on WLAN signal strength according to claim 10,
wherein the remote monitoring step includes receiving information about strength of a signal, sent by each AP, from the corresponding AP, and wherein the detailed position determining step includes calculating a distance (di,m) from each AP to the mobile terminal by using the following equation: -
di,m=d010(Ldi,m /10n)where d0 represents a reference distance for signal measurement, n represents a variable endowed depending on a characteristic of the space, and Ldi,m represents distance attenuation from the APi to the mobile terminal.
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12. The indoor position determination method based on WLAN signal strength according to claim 11, wherein the Ldi,m is calculated by using the following equation:
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Ldi,m=PL(d)−
PL(d0)−
L(ci,j)where PL(d) represents strength of an AP signal received by the mobile terminal, PL(d0) represents strength of a signal of each AP, which is received by the corresponding AP, L(ci,j) represents environmental attenuation of a signal path sent by the APi and received by APj, and the APj is an AP installed in the cell where the mobile terminal is located.
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13. The indoor position determination method based on WLAN signal strength according to claim 12, wherein the L(ci,j) is calculated by using the following equation:
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14. The indoor position determination method based on WLAN signal strength according to claim 13, wherein then is calculated by using the following equation:
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15. An indoor position determination system based on WLAN signal strength, comprising:
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a mobile terminal for sending identification information and signal strength of an AP whose signal is detected to a position determination service server to request position information; an AP for sending information about signal strength from a neighboring AP to the position determination service server; a position determination service server for collecting information received from the APs and generating an AP signal strength table, in a case the position information is requested by the mobile terminal, the position determination service server comparing a pattern of signal strength of each AP received from the mobile terminal with a pattern of signal strength of a neighboring AP of each AP with reference to the AP signal strength table, determining a cell having an AP with a most similar pattern as a cell where the mobile terminal is presently located, and sending information about the determined cell to the mobile terminal as position information; a space information storage unit for storing data about a location of an AP and a cell where the AP belongs to; and an AP information storage unit for storing the AP signal strength table. - View Dependent Claims (16, 17)
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18. An AP for monitoring signal strength of neighboring APs, comprising:
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an Ethernet interface; a storage unit for storing identification information and signal strength of a neighboring AP; an RF module for storing strength of a WLAN signal received from another AP and identification information of the AP which has sent the signal; and a monitoring client for providing the information stored in the storage unit through the Ethernet interface in a wired manner. - View Dependent Claims (19, 20, 21)
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Specification