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Frequency spectrum distribution method based on graph theory in cognitive radio system

A cognitive radio and spectrum allocation technology, which is applied in transmission systems, wireless communications, electrical components, etc., can solve problems such as not adapting to the rapid development of wireless communications, waste of time and space for spectrum resources, and low spectrum utilization, and improve spectrum efficiency. Utilization rate, lower call loss rate, simple algorithm effect

Inactive Publication Date: 2010-03-03
SOUTHEAST UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

In the fixed allocation mode, even if the licensed user does not use the licensed spectrum at a certain time and place, other unlicensed users cannot use the frequency band, resulting in a waste of time and space for spectrum resources, low spectrum utilization, and unsuitable The rapid development of wireless communication

Method used

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  • Frequency spectrum distribution method based on graph theory in cognitive radio system
  • Frequency spectrum distribution method based on graph theory in cognitive radio system
  • Frequency spectrum distribution method based on graph theory in cognitive radio system

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Embodiment Construction

[0023] figure 1 is an illustration of the network topology of a cognitive radio system. The eight vertices 1-8 in the figure represent eight different cognitive users. There are 4 channels A, B, C and D available in the system. There are four main users distributed in the system, that is, users I- IV, now suppose they occupy channel A, channel B, channel C and channel D respectively. Since the cognitive radio chooses to use the frequency band temporarily unused by the licensed user for communication, if the current channel is used by the licensed user, in order to avoid interference to the licensed user, this channel cannot be used by the cognitive user in the licensed user's cell. The four dotted circles in the figure represent the interference ranges of the four authorized users, that is, within the range of the circles, using the same frequency as the authorized users will cause interference to the authorized users. The available frequency sets are represented in parenthe...

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Abstract

The invention provides a frequency spectrum distribution method based on a graph theory in a cognitive radio system. In the method, channel availability and channel connectivity are comprehensively considered when a priority level is calculated and distributed; a parameter of regional call loss rate is introduced at the same time, thereby reducing the call loss rate and enhancing the utilization rate of the frequency spectrum. The method comprises the following steps: firstly, calculating the frequency range degree and the connectivity degree of each node; secondly, calculating the priority level of each node according to the frequency range degree, the channel connectivity and the parameter of the regional call loss rate; selecting the node with the maximum priority level to distribute; selecting the node which has smaller frequency range degree to distribute if the nodes have the same priority level; finding out the frequency range with the minimum interference with neighboring nodethereof in the frequency range list to distribute after the distribution node is determined; after the frequency range is distributed, deleting the frequency range which has the same frequency range in the neighboring node and updating a topological graph; and returning to the first step to re-calculate the priority level until all nodes are matched completely.

Description

technical field [0001] The invention relates to an implementation scheme especially for spectrum allocation of cognitive users in a cognitive radio system, and belongs to the technical field of communication. Background technique [0002] With the rapid development of wireless communication technology, spectrum resources are becoming more and more scarce, but a large number of licensed wireless spectrums are idle or have extremely low utilization. Especially with the development of wireless local area network (WLAN) technology and wireless personal area network (WPAN) technology, more and more people access the Internet in a wireless manner through these technologies. Most of these network technologies work using the unlicensed frequency band (UFB). Due to the rapid development of WLAN and WRAN wireless communication services, the unlicensed frequency bands where these networks work have gradually become saturated. And some other communication services (such as TV broadcas...

Claims

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Application Information

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IPC IPC(8): H04W24/00H04B17/00H04W16/10
Inventor 朱琦蔡莉莉
Owner SOUTHEAST UNIV
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