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Opportunistic spectrum access method based on Markov chain and CSMA

A Markov chain, multi-access technology, applied in transmission monitoring, network planning, electrical components, etc., can solve problems affecting system performance, large amount of calculation, uncertainty of perception results, etc., to achieve accurate perception results, good The effect of spectrum access and improving spectrum utilization

Inactive Publication Date: 2010-06-23
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

Starting from the technical challenges faced by OSA-MAC (Medium Access Control) design, existing solutions cannot always properly solve the problem of fully utilizing the spectrum
At the same time, in order to protect the normal communication of primary users, these algorithms have different degrees of defects in the compromise between spectrum utilization and primary user performance protection. At present, there is no opportunistic spectrum access method that can fully meet the requirements of cognitive radio systems.
The existing opportunistic spectrum access scheme based on Marko chain splitting will lead to the blindness of cognitive user access due to the existence of uncertainty in the perception results, which will affect the performance of the system, and the amount of calculation is very large

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  • Opportunistic spectrum access method based on Markov chain and CSMA
  • Opportunistic spectrum access method based on Markov chain and CSMA
  • Opportunistic spectrum access method based on Markov chain and CSMA

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Embodiment Construction

[0019] With reference to above-mentioned accompanying drawing, the specific embodiment of the present invention is described in further detail:

[0020] Such as figure 1 , the abscissa in the figure represents the interference temperature value υ, λ at the receiving end of the primary user 1 ,λ 2 are the threshold values ​​of the first and second interference temperatures respectively, satisfying λ 1 2 , when the measured disturbance temperature is less than λ 1 When , it means that the primary user signal does not exist, and the cognitive user can perform direct access; and when the value of the interference temperature is greater than λ 2 When , it means that the primary user signal exists, and the CSMA access mode is used for backoff access. When the value of the interference temperature is between λ 1 ,λ 2 In between, it is an uncertain region, and the cognitive users cannot accurately judge the existence of the main user. The Markov link with the main user as the pr...

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Abstract

An opportunistic spectrum access method based on Markov chain and CSMA includes that the access predication statistical module method of the Markov chain is combined with the CSMA access protocol to adopt different access modes according to different induction areas, before the user access is recognized, the spectrum detection is carried out according to spectrum induction method, and the first and second dual thresholds Lambda 1 and Lambda 2 of the interference temperature of the master user, the judgment area whether the master user exists is divided according to the two thresholds, when the interference temperature value is less than the Lambda 1, the user is recognized and accessed directly; when the interference temperature value is more than the Lambda 2, the CSMA access mode is adopted for back-off access; when the interference temperature is between the Lambda 1 and Lambda 2, a Markov chain access predication statistical module with the master user as the priority is built in queuing and non-queuing modes, and the Markov chain module is adopted to describe the opportunistic spectrum access. During access process, the first and second interference temperature thresholds are regulated dynamically to realize the maximization of the whole network throughput.

Description

technical field [0001] The invention relates to a cognitive radio opportunistic spectrum access technology, in particular to an opportunistic spectrum access method based on Markov chain and carrier sense multiple access, which belongs to the technical field of wireless communication and signal processing. Background technique [0002] Opportunistic Spectrum Access (OSA, Opportunistic Spectrum Access) allows unlicensed users (also known as cognitive users) to share licensed spectrum in the space domain or time domain, only when authorized users (also known as primary users) do not occupy these spectrums. users to access. In particular, the dynamic nature of the spectrum environment makes the design of opportunistic spectrum access schemes face several important issues, that is, cognitive users need to determine when and how to access which channel to send / receive data without affecting Normal communication for primary users. Starting from the technical challenges faced by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W16/14H04B17/00H04W24/00H04W74/08H04B17/382
Inventor 吴迎笑杨震
Owner NANJING UNIV OF POSTS & TELECOMM
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