Method for switching frequency spectrum based on cognitive radio technology and system thereof
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A cognitive radio and spectrum switching technology, which is applied in the field of spectrum switching based on cognitive radio technology, to achieve the effect of ensuring continuity and business service quality
Inactive Publication Date: 2013-06-19
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology
At present, the research work on the spectrum switching technology has just started, and the spectrum switching criteria and mechanism are urgently needed to be studied
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Embodiment 1
[0090] For those whose authorized user is a GSM system user, the cognitive user uses the spectrum not used by the authorized user, and performs spectrum switching when the authorized user reclaims the spectrum.
[0091] According to the spectrum switching mechanism and criterion proposed in the present invention, its spectrum switching process is as follows:
[0092] Since the business of the GSM system is mainly a voice service, the probability distribution of authorized user call arrival obeys the Poisson distribution, and the call interval obeys the negative exponential distribution; the probability distribution of the call duration obeys the negative exponential distribution, and the call leaving probability obeys the Poisson distribution.
[0093] Assuming that the call arrival rate is λ, its probability density function is:
[0094] P 1 ( k ) = e ...
Embodiment 2
[0120] For those licensed users of the broadband OFDM system, the cognitive users dynamically use the unused spectrum of the licensed users, and perform spectrum switching when the cognitive users request higher bandwidth.
[0121] Due to the rich types of services, including conversational, streaming, interactive, and background, each service has different requirements for delay, delay jitter, and bandwidth. When a cognitive user who is communicating proposes a new higher bandwidth Spectrum switching can be performed to meet user needs when services are required.
[0122] In this embodiment, when the cognitive user is using the authorized user's spectrum, but the spectrum pre-estimation threshold has not yet been reached, the handover triggered by the authorized user reclaiming the spectrum is considered.
[0123] If the handover is triggered, if the cognitive user maintains an available spectrum set and the set is not empty, the user can directly select a suitable spectrum i...
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Abstract
The invention provides a method for switching a frequency spectrum based on a cognitive radio technology and a system thereof. The system comprises: a time diving module for dividing the communication process of a cognitive user into a data transmission time and a frequency spectrum detection time according to time dimension; a data transmitting module for performing communication and data transmission on the frequency spectrum currently utilized by the cognitive user at the time transmission time; a frequency spectrum judging module for judging whether the frequency spectrum is needed to be switched at the frequency spectrum detection time, wherein if the frequency spectrum is needed to be switched, judging whether an available frequency spectrum is existed in an available frequency spectrum set; a frequency spectrum detecting module for detecting that the availability of the frequency spectrum exceeds the threshold value of the available frequency spectrum, the available time exceeds the threshold value of the available time, and the unoccupied available frequency spectrum; and a frequency spectrum switching module for switching the frequency spectrum which is currently utilizedby the cognitive user into the available frequency spectrum. The invention can guarantee the continuity of the communication of the cognitive user and the service quality.
Description
technical field [0001] The present invention relates to the field of wireless communication and mobile communication, in particular to a method and system for spectrum switching based on cognitive radio technology. Background technique [0002] The traditional fixed spectrum allocation scheme allocates non-overlapping dedicated frequency bands for different wireless communication systems. Under this spectrum allocation system, with the rapid development and wide deployment of wireless and mobile communication systems, it is an important Spectrum resources for carrying are becoming more and more scarce, especially most of the frequency bands below 2 GHz suitable for mobile communications have been allocated, which has become the primary problem facing the research, development and deployment of many new wireless and mobile communication systems. [0003] However, after measuring the status quo of spectrum usage by many wireless management departments, communication companies,...
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