Distributed power control method in cognitive network on basis of cooperative game

Abstract

The invention discloses a distributed power control method in a cognitive network on the basis of a cooperative game, which comprises the following steps that: a master user sets an interference permissible threshold T and broadcasts price factors lambda (t) according to service quality of the master user; after receiving the price factors broadcast by the master user, each secondary user j belongs to a set of (1,...,n) measures total interference and noise at the position of a receiving terminal of the secondary user and then broadcasts the price factors cj=1 / Ij (t) to the rest of secondary users, and after the broadcast of all the price factors is completed, each secondary user updates the power of the secondary user; the master user updates the price factor of the master user and regulates the price factor on the basis of the interference of the secondary users; and the second step and the third step are repeated until the powers of the secondary users are converged. According to the distributed power control method provided by the invention, the performance of a center method on the basis of the cooperative game is rapidly converged; by an obtained result, the secondary users fairly and efficiently utilize spectrum resources in the cognitive network and the powers among the secondary users are regulated only by utilizing local channel information of the secondary users without knowing overall channel information of the integral cognitive network; and the distributed power control method has strong practicality and feasibility.

Description

technical field [0001] The invention relates to the technical field of spectrum resource management, in particular to a cooperative game-based distributed power control method in a cognitive network. Background technique [0002] Power control is the key technology for the cognitive radio system to realize spectrum resource sharing. In order to ensure that the interference when the secondary user accesses the authorized frequency band of the primary user does not affect the normal communication of the primary user, it is necessary to properly adjust the power of the secondary user in the cognitive network. In cognitive networks, the spectrum utilization between secondary users and the protection of primary users depend on the performance of power control methods. [0003] Traditional power control methods in cognitive networks generally aim at maximizing the sum rate of the entire network or maximizing the rate of the smallest secondary user. This method needs to know the ch...

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Problems solved by technology

However, because this method only considers the maximization of its own utility and the disturbance to the primary user among the secondary users, it does not consider the influence of the secondary user's own power control on the disturbance of the other secondary users, so it cannot guarantee to converge to a cooperative game-based The optimal solution of the power control can not efficiently use the spectrum, and the result of convergence cannot guarantee the fairness between the secondary users based on the cooperative game. More power, so that the remaining secondary users allocate less power

[0011] Another power control method is to maximize the rate of the smallest user in the entire cognitive network. This method makes the rate of all secondary users the same, thereby ensuring strict fairness among secondary users; but because the rate of this method is mainly affected by The worst secondary user limitation of the channel, so this method makes the sum rate of the entire cognitive network smaller, while obtaining fairness among secondary users, it greatly sacrifices the throughput of the entire cognitive network

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