Research On The Theory And Algorithm Of Spectrum Sharing For 5G Network

With the rapid development of mobile networks,one of the challenges facing 5G wireless systems is how to deal with the unprecedented spectrum crisis.A potential solution is in the form of spectrum sharing.Based on game theory and hybrid duplex theory,this paper studied spectrum sharing technology.It proposed a hybrid access spectrum sharing algorithm based on two stage game theory,and a random MAC spectrum sharing algorithm based on mixed half duplex / full duplex.The main contents and contributions of this article can be summarized as follows:(1)For two spectrum markets,from the economic point of view,a hybrid access spectrum sharing algorithm based on two-stage game was proposed.In the two scenarios of duopoly spectrum operators and monopoly spectrum operators,the secondary users selected operators based on their different preferences for prices.At the same time,operators could make optimal investments and adjust prices dynamically to maximize revenue.The Nash equilibrium solution of spectrum access was obtained through game theory.(2)A random MAC spectrum sharing algorithm based on mixed half duplex / full duplex was proposed.The spectrum usage level was represented by probability,namely opportunistic probability(OP).Based on opportunity probability,a random MAC strategy was proposed in which each node accessed the spectrum with a probability proportional to the OP value and we verified its feasibility.Using a random MAC based on opportunistic probability,we also proposed a hybrid half duplex/full duplex communication model in which per pair duplex mode was dynamically determined by the OP value.Through simulation,we confirmed the feasibility of the proposed algorithm and proved that it has 4 times higher system throughput than the traditional system.This shows great potential for the use of future spectrum resources.