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Heterogeneous wireless network selection method based on interval triangular fuzzy number

A heterogeneous wireless network, triangular fuzzy technology, applied in the field of communication, can solve problems such as irregular changes

Inactive Publication Date: 2015-08-12
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

No matter which method is used, it is not very good to consider that the network parameters are very uncertain at any time, and their changes are irregular

Method used

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  • Heterogeneous wireless network selection method based on interval triangular fuzzy number
  • Heterogeneous wireless network selection method based on interval triangular fuzzy number
  • Heterogeneous wireless network selection method based on interval triangular fuzzy number

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Embodiment Construction

[0060] 1. Fuzzy set theory

[0061] Before introducing the fuzzy AHP method, it is necessary to introduce some preliminary knowledge about fuzzy theory.

[0062] When Bellman & Zadeh introduced fuzzy set theory into decision science, they defined fuzzy set theory precisely as follows:

[0063] Definition Let X represent a collection of objects (points), and each object point is generally expressed as x. A fuzzy set F is defined as a set of ordered pairs: F={(x,μ F (x))}, x∈X

[0064] where μ F (x) is called the membership degree of x in F, and μ F (X→M) is a function from X to domain M, called membership function. When M only contains two points 0 and 1, X is non-fuzzy, and its membership function is equivalent to the characteristic function of non-fuzzy sets.

[0065] Example: Let X={1,2...} be a set of non-negative integers. In this domain, a fuzzy set F of several objects may be defined (subjectively defined) as a set of ordered pairs:

[0066] F={(3,0.6),(4,0.8),(5...

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Abstract

To solve the selecting problem of a heterogeneous wireless network, the invention provides a network selection method based on an interval triangular fuzzy number, considering the uncertainty and irregularity of different parameter variations of various networks. The method constructs an optimization model combining subjective and objective weights to obtain an optimal weight, the subjective weight is obtained by a fuzzy analytic hierarchy process, and the objective weight is obtained by an entropy method. When a decision matrix is constructed, considering the uncertainty of network parameters, the interval triangular fuzzy number is used for processing data, and the sorting of the networks is achieved finally based on an improved gray correlation analysis method. The method in the invention can effectively reduce the switching times of terminals relative to other methods, and has better performance in terms of network parameters (time delay, time-delay jitter and throughput capacity).

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to a heterogeneous network access decision method based on multi-network parallel transmission. Background technique [0002] With the continuous development of Internet technology, broadband wireless access technology has also made great progress, and a new network structure in which multiple network technologies coexist, represented by heterogeneous networks, has attracted widespread attention. The emergence of heterogeneous networks has brought about the problem of network selection. Since each network has different coverage, security levels, charges, and QoS that can be provided, it becomes a problem to choose to access the network that best meets business needs at a certain moment. The problem that must be solved. [0003] The network selection problem in a heterogeneous network is a typical multi-attribute decision-making problem. In order to provide user-satisfied QoS an...

Claims

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Application Information

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IPC IPC(8): H04W48/18H04W36/14
CPCH04W48/18H04W36/14
Inventor 朱琦郦烜杰
Owner NANJING UNIV OF POSTS & TELECOMM
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