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Active spectrum sensing switching method

A spectrum sensing and active technology, applied in the field of mobile communication, can solve the problems of low resource utilization and low probability

Active Publication Date: 2017-03-15
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0009] (4) The active spectrum selection method based on time estimation belongs to the highest matching algorithm, and the utilization rate of resources is not high
Spectrum allocation schemes based on graph theory or game theory are only suitable for processing multiple spectrum allocation requests at the same time, but in actual systems, new access requests or handover requests occur independently on the discrete time axis. The probability of multiple spectrum allocation requests at the same time will be relatively small

Method used

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Embodiment Construction

[0090] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0091] like figure 1 As shown, it is the application scene diagram of the cognitive wireless network of the present invention, in which there is no base station management center in the cognitive user network, the cognitive nodes are in peer-to-peer positions, and the cognitive users transmit control information through dedicated control channels , after the allocation is completed, data transmission is performed on the respective data channels. When the channel state changes, the cognitive user needs to notify the communication partner to vacate the currently occupied channel, and jointly switch to another idle channel to continue unfinished communication.

[0092] like Figure 2~3 As shown, the present invention is a method for active spectrum sensing switching, comprising the following steps:

[0093] 1. Initialization:

[0094] The ...

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Abstract

The invention relates to an active spectrum sensing switching method. The method mainly comprises the steps that a cognitive user senses and collects spectrum information of available channels; the cognitive user calculates to obtain next time slot idle probabilities of the channels, residual idle time correction factors of the channels and learning constants of cognitive user switching thresholds through long term observation; the cognitive user judges when to switch and which channel to switch; and the cognitive user carries out spectrum switching and recovers communication. According to the method, changes of the channels can be dynamically tracked and the spectrum can be switched rapidly; on-demand switching can be realized on the premise of not disturbing licensed users; the collision and switching times is effectively reduced; and the method can be applied to a spectrum switching process in a distributed cognitive radio network.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, relates to dynamic spectrum access in a cognitive wireless network, and in particular to a cognitive user active spectrum sensing switching method in a distributed cognitive wireless network. Background technique [0002] With the rapid development of wireless communication services, wireless spectrum resources become increasingly scarce. Due to the limitation of Shannon's theorem, many advanced communication technologies, such as channel coding technology, orthogonal frequency division multiplexing technology, smart antenna technology, etc., cannot fundamentally improve the utilization rate of spectrum. In order to further improve the utilization efficiency of wireless spectrum resources, cognitive radio technology emerges as the times require. Users in the cognitive radio network have the ability to perceive the surrounding environment, and can dynamically select the currently idl...

Claims

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Application Information

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IPC IPC(8): H04W16/14H04L27/00H04L12/24
CPCH04L27/0006H04L41/145H04W16/14Y02D30/70
Inventor 曹型兵焦中帅唐起超孙梦璐
Owner CHONGQING UNIV OF POSTS & TELECOMM
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