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Wireless network link quality estimation method

A link quality and wireless network technology, applied in wireless communication, electrical components, etc., can solve the problems of low practicability, incomplete link quality estimation, etc., and achieve the effect of high precision and comprehensive estimation parameters

Inactive Publication Date: 2013-10-02
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to propose a link quality estimation method for simultaneously estimating the two parameters of the link packet loss rate and delay in view of the incompleteness and low practicability of the current existing link quality estimation

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Embodiment Construction

[0018] When a node periodically sends data packets, the receiving node can record the arrival time of the periodically sent data packets, and the arrival times are T i i=1,2,3...N, where T 1 The time for the node to join the network, T N is the time when the node received the data packet last time. to T i Do the difference operation to get the time interval sequence: ΔT i = T i+1 -T i ,i=1,2,3...N-1;

[0019] If ΔT i As a random variable, establish a data packet arrival model: ΔT i = T 0 G+U, where G is a random variable that obeys a geometric distribution with a parameter of 1-p, U is a random variable that obeys a geometric distribution with a parameter of (0,2t), G is a discrete distribution, represented by a probability distribution, and U is a uniform distribution , is a type of continuous distribution, represented by a probability density function;

[0020] P(G=k)=(p) k-1 (1-p)=(p) k-1 (1-p), 0≤x≤2t;

[0021] Among them, p and t represent the link reverse ...

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Abstract

The invention discloses a wireless network link quality estimation method aiming at the problems of incompleteness and low practicality of a conventional link quality estimation method. The method comprises the steps as follows: sending a detection data packet; calculating the detection data packet arrival time; estimating real-time reverse link parameters, namely estimating the packet loss rate p and the time delay t of a real-time reverse link between a mobile node and each neighbor node through a detection data packet arrival relation (delta Ti=T0G+U) according to a detection data packet time interval (delta Ti) corresponding to each neighbor node; and updating the link parameters, namely smoothing the packet loss rate p and the time delay t of the real-time reverse link. According to the method, the link quality of a network is comprehensively reflected through effective estimation of each node in a wireless self-organizing network or a wireless sensor network to the packet loss rate and the time delay t.

Description

technical field [0001] The invention relates to a communication link parameter estimation method of a wireless sensor network and a mobile ad hoc network. Background technique [0002] In the field of mobile ad-hoc networks, in order to carry out efficient and stable communication, the communication parties often need to select links with high link quality. However, in practical applications, due to the unstable and asymmetric characteristics of wireless links, each A communication node often needs to obtain the link quality of each link connected to it in real time. The existing methods can be divided into three types: link estimation methods based on geographic location, link estimation methods based on signal strength, and link estimation methods based on periodic data packet detection. Among these three methods, the first two methods require specific hardware support, so their scope of application is greatly limited. For the link estimation method based on periodic pack...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W24/02
Inventor 王海南张冰许瑞廖红舒魏平
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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