Client machine node locating method of wireless meshed network
A wireless mesh network and node positioning technology, which is applied in the direction of data exchange through path configuration, can solve the problems of large measurement method errors, inability to map signal strength to specific distance values, large measurement errors, etc., to improve accuracy Effect
Inactive Publication Date: 2009-06-24
PEKING UNIV
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However, in practical applications, wireless signal transmission will undergo various changes such as scattering, diffraction, and reflection due to the influence of the environment, and it is difficult to use a definite model to describe its change law
In addition, in general measurement, the measured signal strength is at 1dBW (or 1dBm) accuracy, and it is impossible to map the signal strength to a specific distance value
It can be seen that mapping the signal strength value to a specific distance value will bring a large measurement error, coupled with the measurement error of the signal strength itself, the measurement method calculated based on the signal strength transmission model will have a very large error
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[0028] The present invention first obtains the signal strength and node distance between the nodes of the corresponding wireless mesh network according to different wireless network scene models, divides the signal strength and node distance into several intervals, and determines the signal strength interval and distance interval in each scene model Correspondence between.
[0029] The corresponding relationship between the signal strength interval and the distance interval of the present invention has a direct relationship with the wireless network scene model adopted. Before dividing, firstly, according to the wireless network scene, calculate the signal strength at different distances within the communication range, and according to the desired measurement Precision picks the calculated distance value. In general, the distance in integer meters is selected. In practical applications, according to the wireless network scenario of a specific environment, data is collected th...
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The invention provides a client-node localization method of wireless mesh network, which belongs to the communication technical field of wireless mesh network. The method includes: the client node starts the monitoring thread, receives a plurality of packets that are sent by the backbone nodes connected with the client node at a certain period of time, and obtains the coordinates information of corresponding backbone nodes and the signal strength between the client node and the backbone nodes; the distance interval value between the client node and the backbone nodes is obtained according to the corresponding relation between the signal strength interval and the distance interval; in the wireless mesh network coordinate system, the coordinate of each backbone node is taken as the center of a circle, and a ring is drawn by taking the upper and the lower limit value of the distance interval between the client node and the corresponding backbone nodes; after obtaining the rings of a plurality of backbone nodes, an overlapping area of the ring is confirmed, the centroid of the overlapping area is calculated, and the coordinate of the client node is obtained. The accuracy of the client node localization of the wireless mesh network can be improved by applying the invention.
Description
technical field [0001] The invention belongs to the technical field of wireless mesh network communication, and in particular relates to a client node positioning method of a wireless mesh network (WMN). Background technique [0002] There are two kinds of nodes in the WMN network: one kind of node is a routing node on the backbone network, that is, a backbone node; the other kind of node is a client node connected to the backbone node in WLAN mode. In the WMN network, the backbone node plays an access role to the client node, that is, the backbone node provides access service for the client node. [0003] Client node location methods for WLAN networks are usually implemented based on measuring the strength of signal transmissions. The existing client location method is specifically: according to the wireless transmission model, use a mathematical model to describe the characteristics of wireless signal transmission, and calculate the relationship between the client node an...
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IPC IPC(8): H04L12/28
Inventor田明军王靖轩严伟李晓明
OwnerPEKING UNIV