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Opportunistic spectrum access method based on collision probability constraint

A collision probability and spectrum access technology, which is applied in electrical components, wireless communication, network planning, etc., can solve the problems of primary user damage and inability to effectively arrange secondary user spectrum access and transmission

Inactive Publication Date: 2009-07-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the traditional method does not have any information about the time length distribution of future idle spectrum, it cannot effectively arrange the future spectrum access and transmission of secondary users, and cause uncontrollable collision between secondary users and primary users, which may cause damage to primary users due to collisions. cause intolerable damage

Method used

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  • Opportunistic spectrum access method based on collision probability constraint
  • Opportunistic spectrum access method based on collision probability constraint
  • Opportunistic spectrum access method based on collision probability constraint

Examples

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Embodiment 1

[0035] Embodiment 1: An opportunistic spectrum access method based on collision probability constraints when the target spectrum idle time follows a negative exponential distribution

[0036] In this embodiment, the mean value of the busy duration of the target spectrum is v, but the idle duration of the target spectrum obeys a negative exponential distribution, and its distribution function is f(t)=ue -ut (t≥0). In the case that the idle time of the target spectrum obeys the negative exponential distribution, the flow of the opportunistic spectrum access method based on the collision probability constraint is as follows: figure 2 shown, including the following steps:

[0037] 1) Initialization: set the collision probability constraint value according to the requirements of the main user , this embodiment is set to ; The parameter u of the target spectrum idle time distribution function f (t) and the mean value v (v>0) of the target spectrum busy time are set to any valu...

Embodiment 2

[0044] Embodiment 2: Opportunistic Spectrum Access Method Based on Collision Probability Constraints When the Destination Spectrum Idle Time Follows the Universal Pareto (Pareto) Distribution

[0045] In this embodiment, the mean value of the busy duration of the target spectrum is v, but the idle duration of the target spectrum obeys the general Pareto distribution, and its distribution function is

[0046] f ( t ) = 1 σ ( 1 + k 1 σ ) - 1 - 1 / k ,

[0047] where k≠0 is the shape parameter, and σ is the scale parameter. In the case that the idle time of the target spectrum obeys the general Pareto distribu...

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Abstract

The present invention relates to an opportunistic frequency spectrum access method based on collision probability restriction, and belongs to the technical field of wireless mobile communication. The method comprises the following steps: setting a collision probability restriction value zeta, and setting the parameter of frequency spectrum disengagement time length distribution function f(t) to arbitrary values; circulating the following steps: continuously perceiving until the frequency spectrum is free; if the frequency spectrum is free, using zeta, f(t) and v for calculating the optimal access time point x and optimal access time length T, if the free time length is smaller than x, perceiving the frequency spectrum, otherwise continuously accessing the frequency spectrum until the access time length is larger than T or collision generation; if the access time length is larger than T, continuing perceiving until the frequency spectrum is busy, and if the frequency spectrum is busy, calculating and storing the busy time length and idle time length, estimating the parameter of f(t) and v for entering the next circulation; and if the collision is generated, calculating and storing busy time length and free time length, estimating the parameter of f(t) and v for entering the next circulation. The method of the invention can optimally use the free frequency spectrum resource and simultaneously satisfies the collision probability restriction which can be tolerated by the master subscriber.

Description

technical field [0001] The invention belongs to the technical field of wireless mobile communication, and in particular relates to an opportunistic spectrum access method for secondary users aiming at maximizing the utilization rate of idle spectrum. Background technique [0002] In recent decades, wireless mobile communication technology has developed rapidly, and wireless mobile communication services are more and more favored by people. The status quo of low utilization of wireless spectrum and the increasing demand for wireless communication lead to the concept of secondary utilization of idle spectrum, which leads to the development of opportunistic spectrum access, a core technology to improve spectrum utilization. The main idea of ​​opportunistic spectrum access is to take advantage of the instant availability of spectrum by opening licensed spectrum to secondary users (unlicensed users), allowing secondary users to use wireless spectrum resources that are not used or...

Claims

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Application Information

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IPC IPC(8): H04W16/14H04W72/10H04W72/12H04W74/00
Inventor 李云洲肖青海王京周世东钟晓峰高群毅
Owner TSINGHUA UNIV
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