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Multi-user cooperation channel selection method in cognitive wireless network

A cognitive wireless network and multi-user collaboration technology, applied in wireless communication, network planning, transmission monitoring, etc. higher question

Inactive Publication Date: 2012-05-23
SHANGHAI RES CENT FOR WIRELESS COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the spectrum detection and switching of cognitive users will consume the effective transmission time of cognitive users
It is a relatively inefficient channel characteristic estimation method to complete the detection and statistics of all target channels by cognitive users themselves, and it is not conducive to the improvement of spectral efficiency.
[0008] 2. The application of multi-user cooperation in cognitive wireless networks mainly focuses on the state detection of the target channel, while the research on channel selection using multi-user cooperation is still blank
[0009] 3. In the existing cognitive wireless network, the processing method of the statistical value of the target channel characteristic parameters is inefficient, and the estimation accuracy is not high, which affects the access efficiency of cognitive users and the accuracy of channel selection

Method used

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  • Multi-user cooperation channel selection method in cognitive wireless network
  • Multi-user cooperation channel selection method in cognitive wireless network
  • Multi-user cooperation channel selection method in cognitive wireless network

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] figure 1 The target channel in the paper refers to the channel available to the cognitive system in the wireless network environment where the cognitive user is located; the collaborative cognitive user refers to the cognitive user who provides collaborative information for the target cognitive user in the cognitive system; the target A cognitive user refers to a cognitive user who has obtained the cooperation of other cognitive users in the cognitive system; cooperation information refers to information including target channel characteristic parameters sent by a cooperative cognitive user to a target cognitive user. figure 1 The circles filled with slashes in represent the cognitive users who are accessing the target channel, while the hollow circles represent the cognitive users who have not accessed the target channel or have accessed the target channel but are not currently connected to the target channel.

[0046] First introduce a few concepts in detail:

[0047...

Embodiment 2

[0071]The difference between this embodiment and Embodiment 1 is that the distribution h is assumed to be a normal distribution, and the duty ratios of the target channels recorded by all cooperative users have the same uncertainty. The specific implementation process of the method of the present invention will be described below by taking an example of updating the duty cycle and uncertainty of the nth target channel recorded by the target cognitive user after receiving the collaboration information of the i-th cooperating user.

[0072] 1'. Target cognitive users define the actual duty cycle θ of the nth target channel n satisfied with as the mean value, with Probability distribution for variance where h is a normal distribution.

[0073] 2'. The target recognizes the user's duty cycle of the nth target channel according to the received cooperation information The update can be done as follows:

[0074] x ~ ...

Embodiment 3

[0092] The difference between this embodiment and Embodiment 2 is that: the duty cycle of the channel satisfies the exponential distribution, and at this time, the updated cooperation information update probability factor corresponding to the nth target channel is:

[0093] ρ ~ n = ρ n σ n , 0 e - σ n , 0 x n 0 - x n ...

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Abstract

The invention discloses a multi-user cooperation channel selection method in a cognitive wireless network. The method comprises the following steps that: step 1. a target cognition user enters into a cognitive system and determines whether there is credible target channel duty ratio information in the cognitive system; step 2. a cooperative cognition user in the cognitive system provides cooperation information to the target cognition user and the cooperation information comprises a duty ratio of a target channel and a corresponding uncertainty; step 3. the target cognition user updates the target channel duty ratio recorded by the target cognition user himself or herself and the corresponding uncertainty according to the cooperation information; step 4. the target cognition user compares the updated uncertainty with a preset uncertainty threshold; if the updated uncertainty is greater than or equal to the preset uncertainty threshold, the channel is selected to be accessed according to the duty ratio; otherwise, the step 2 is returned to. According to the method of the invention, based on that target channel information sharing of the multi-user cooperation is realized, characteristic estimation and rapid distinguish of the target channel can be realized and channel selection and access time can be shortened.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a multi-user cooperative channel selection method in a cognitive wireless network. Background technique [0002] Due to the problems of low spectrum utilization and inflexible allocation in the existing spectrum allocation and management strategies, the industry and academia have studied the use of cognitive radio to achieve dynamic spectrum access to improve spectrum utilization. At present, cognitive users adopting cognitive radio technology realize dynamic spectrum access by detecting licensed frequency bands to find channels in an idle state. Due to the randomness of idle resources, if cognitive users randomly select licensed frequency bands for detection in order to find free channels, the blindness of spectrum selection will lead to the reduction of spectrum detection efficiency of cognitive users, making cognitive users’ The transmission quality is difficult ...

Claims

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Application Information

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IPC IPC(8): H04B17/00H04L25/02H04W16/14H04W24/00
Inventor 杨旸袁广翔徐景胡宏林钱骅熊勇
Owner SHANGHAI RES CENT FOR WIRELESS COMM
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