Fairness-based power and channel joint allocation method for cognitive radio system

Abstract

The invention provides a fairness-based power and channel joint allocation method for a cognitive radio system, belongs to the technical field of wireless communication, and in particular relates to power and channel joint allocation used in the cognitive radio system. The invention relates to the power and channel joint allocation method which can meet the requirements of unauthorized users on quality of service (QoS), ensure the fairness and protect the authorized users at the same time. According to different QoS requirements of the unauthorized users, a mathematical definition on the fairness is given. Simultaneously, in order to reduce arithmetic cost and shorten the allocation period, the method divides the whole allocation process into two stages; the first stage is called as the crude allocation, at the stage, the protection of the authorized users is taken as premises, and the maximum resource which can be utilized by each non-authorized user is obtained according to the QoS requirements of the non-authorized users and the fairness; and the second stage is called as the fine allocation, at the stage, a plurality of non-authorized users independently complete the tasks, which can be serially and simultaneously completed by the authorized users, so that the complexity is reduced, the quick power and frequency spectrum allocation can be conveniently realized so as to adapt to the quick time varying characteristics of available frequency spectrum resources in the cognitive radio system, and all authorized users can independently determine the final utilizable resources.

Description

technical field [0001] A fairness-based joint allocation method of power and channels in a cognitive radio (Cognitive Radio) system belongs to the technical field of wireless communication, and in particular relates to joint allocation of power and channels applied in a cognitive radio system. Background technique [0002] With the continuous expansion of wireless applications, the lack of spectrum resources has become an unavoidable problem in the process of wireless application research. However, from some research results, it can be seen that the lack of spectrum resources is more caused by the unreasonable use of wireless access technologies. of. Current spectrum management strategies are based on a static control model. The management agency divides the available spectrum resources into fixed, non-overlapping spectrum blocks, and divides them by guard bands, and allocates these spectrum blocks to different services and technologies in an exclusive manner, such as: mobi...

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Problems solved by technology

The second category is interference between unauthorized users

[0021] The disadvantages of the above method are: 1) Since all the assignment work is done by the base station, as the number of available channels increases, the number of cells increases or the number of unauthorized users increases, the execution time overhead of the algorithm will also increase accordingly, and the allocation time The period will also be extended accordingly, which makes this spectrum allocation method not suitable for the fast time-varying requirements of idle spectrum in cognitive radio

For example, in the above algorithm, if the fairness of resource allocation among cells is not considered, otherwise some cells with emergency services may not be able to allocate resources

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