Method for channel switching of cognitive user and performance analysis method of method for channel switching of cognitive user
A technology for cognitive user and channel switching, which is applied in the field of performance analysis of the method, and can solve the problems of analyzing the performance of opportunistic spectrum access system and optimizing the channel access selection of cognitive users.
Inactive Publication Date: 2014-04-30
NANJING UNIV OF POSTS & TELECOMM
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However, there is no generalized model for analyzing cognitive user channel handover activities, and there are no simple and practical closed expressions for performance indicators such as successful handover probability, blocking probability, and average handover time. Difficulty in optimizing channel access selection for cognitive users
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[0055] In the following, the cognitive user channel switching method and performance analysis method of the present invention will be further described in detail in conjunction with the accompanying drawings and specific implementation methods.
[0056] The opportunistic spectrum access system scenarios where the cognitive user channel switching method and its performance analysis method are applicable are as follows: figure 1 shown. Assume that the main network has N licensed channels with a bandwidth of W, which are numbered i=1,...,N in sequence. The primary user has spectrum access priority and adopts centralized access control. The base station or access point AP assigns a unique channel to the primary user requesting access; the primary user can occupy the channel until the end of its transmission after successful access ; Once the channel is allocated, the newly arrived primary user is directly blocked. Cognitive users have spectrum sensing capabilities, can perceive ...
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The invention provides a method for channel switching of a cognitive user and a performance analysis method of the method for channel switching of the cognitive user and relates to the technical field of opportunity frequency spectrum access systems in the wireless communication technology. The method for channel switching comprises the steps that a periodical cognition-transmission time slot structure is adopted by the cognitive user for conducting data transmission and the cognitive user determines whether channel switching is conducted or not in each cognition period according to the fact whether a master user appears on a currently-occupied channel; according to the performance analysis method, a closed expression of performance parameters such as the average non-switching probability, the switching probability, the blocking probability, the switching relay and the like of the cognitive user is provided, the method can effectively and easily analyze the cognitive user channel switching performance in a quantitative mode, assessment of the channel switching performance, namely the indexes of the non-switching probability, the successful-switching probability, the blocking probability, the average switching relay and the like, of the cognitive user is achieved. According to the method, the theoretical and practical significance is brought for researching operation that a switching mechanism of the opportunity frequency spectrum access system is optimally designed and the handling capacity of a cognitive network is improved.
Description
technical field [0001] The invention relates to the technical field of wireless communication, in particular to a channel switching method for cognitive users in an opportunistic spectrum access system (Opportunistic Spectrum Access, OSA), and a method for performance analysis of the method. Background technique [0002] Cognitive radio and dynamic spectrum access technology have become research hotspots and important topics in the field of wireless communication in recent years because of their great advantages in improving wireless spectrum efficiency. As a dynamic spectrum access scheme most compatible with the current spectrum management system, opportunistic spectrum access technology has attracted extensive attention from researchers. Its basic idea is to Cognitive users (secondary users) look for free frequency bands that are not occupied by primary users by sensing the occupancy of authorized frequency bands, and select one or more free frequency bands to access comm...
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IPC IPC(8): H04W24/00H04W36/06
Inventor 张晶朱洪波
Owner NANJING UNIV OF POSTS & TELECOMM
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