Performance Evaluation And Equilibrium Analysis Of Dsa Scheme On Batch Requests

The increasing number of Internet users together with the diverse types of networkbusiness lead to great challenges to wireless communication networks. Wireless resources,such as spectrum, become more and more valuable and more and more limited. Dynamicspectrum allocation in cognitive wireless networks focus on solving the contradictionbetween the shortage of available spectrum and the low utilization of authorized spectrum.Considering the cognitive radio network environments, the performance evaluation,equilibrium analysis and pricing mechanism of the dynamic spectrum allocation schemeare given in this paper.Firstly, for dynamic spectrum allocation scheme with batch requests, assuming thatthe buffer capacity for secondary user packets is infinite, and considering the primaryusers have preemptive priority to authorized spectrum, a batch arrival queueing modelwith possible transmission interruption is established. By using the method of probabilitygenerating function, the queueing model is analyzed in steady state, then the close-formsolutions of the average latency, spectrum switching rate, interruption rate and throughputof secondary user packets are derived.Secondly, considering the secondary user packets in the buffer are possible to leavethe system due to their impatience, a batch arrival queueing model with possibleimpatience and transmission interruption is established. By using the method of Gauss-Seidel iterative, the queueing model is analyzed in steady state. The loss rate, blockingrate, throughput and average latency of the secondary user packets are given.Thirdly, combining numerical results and simulation experiments, the influence of thesystem parameters on the performance measures is evaluated. For dynamic spectrumallocation strategy without impatient packets, the change trends of the average latency,spectrum switching rate, interruption rate and throughput of secondary user packets areshown. For dynamic spectrum allocation scheme with impatient packets, the influence ofbatch arrival rate of secondary user packets, impatience parameter of secondary userpackets and arrival rate of primary user packets on the loss rate, blocking rate, throughput and average latency of the secondary user packets is investigated.Finally, by constructing a benefit function and comparing the Nash equilibriumstrategy with social optimization strategy, a pricing policy for secondary user packets ispresented. Numerical results are provided for the spectrum admission fee to the secondaryuser packets without impatience and with impatience, respectively. Moreover, theinfluences of the system parameters on the individual net benefit secondary user packet,socially net benefit and spectrum admission fee are investigated.