文摘
In order to realize efficient data transmission for multiple bounded rationality users sharing multiple channels in radio network, a dynamic spectrum access mechanism based on graphical evolutionary game is proposed to describe user’s dynamic process for distributing transmission rate. The mechanism can reflect the real game relationship among users, thus simplifying the complexity of the game. Meanwhile, a dynamic spectrum access algorithm with smaller complexity and corresponding dynamic equation are designed for the mechanism, converging to Nash equilibrium with faster speed and obtaining higher system throughput. At Nash equilibrium, the reward of individual user is identical on each channel. Theory analyzes and proves that the dynamic equation is globally asymptotically stable, which illustrates that when user deviates because of bounded rationality, it is still able to converge again with faster speed and guarantee better performance with less deviation, and user’s deviation only affects its neighboring users, not spreading to the whole network. Simulation comparison verifies the superiority above. Keywords Dynamic spectrum access mechanism Graphical evolutionary game Dynamic equation Nash equilibrium