Performance Evaluation And Charging Scheme Of Dsa System Based On Impatient Behavior Of Secondary Users

With the development of information age,the number of users on the Internet are rapid increasing,which makes the limited spectrum resources become more scarce.In cognitive radio network,considering the feature of dynamic spectrum allocation and facing the secondary users with impatient behavior,respectively based on finite and infinite buffer,through numerical experiments and simulation experiments to evaluate the performance of the system.The Nash equilibrium strategy and social optimal strategy are studied,and the charging scheme for secondary users is developed.First of all,the secondary users have impatient behavior,considering the characteristics that the primary users can break the secondary users,establishing a preemptive priority queue model with impatient behavior and limit cache.The steady state solution of the system is obtained by Gauss iteration method,and obtain the expression of the system blocking rate,the average delay and the spectral switching rate.Secondly,assuming that the waiting queue capacity of the secondary users is infinite,a preemptive priority queue model based on the secondary users with impatient behavior and infinite cache is established.An algorithm for solving the steady state distribution of the model is obtained based on K's algebraic equation method,and the expression of each performance index of the system is derived according to the steady state distribution.Again,in order to evaluate the influence of the impatient behavior on the system performance.Based on the above two models and the performance expressions,with Matlab numerical experiments are carried out.Considering the user's arrival and service process in dynamic spectrum allocation strategy,with Matlab simulation experiments are carried out.Finally,according to the cost of secondary users in the system and the return of success transfer,the income function for secondary users is established.The influence of the system parameters on a single secondary user net income and social net income was verified,and the result show that the arrival rate of secondary users in Nash equilibrium strategy is greater than that in social optimal strategy.In order to realize the unification of Nash equilibrium strategy and social optimal strategy,the secondary user's charging scheme is determined.