Research On Resource Optimization Scheduling Strategy In Two-way Relaying Networks

With the continuous increase of communication services,wireless resources are becoming increasingly scarce.By introducing relay nodes,relay communication technology enables the data interaction between source nodes and destination nodes to be completed with the assistance of relay nodes,thus reducing the transmission power of source nodes and saving energy resources.The two-way relay network can realize bidirectional transmission of data on the channel,and solves the problem of low channel resource utilization in the traditional one-way data transmission.Buffer relay technology makes relay adaptively select links with good channel conditions for information transmission by equipping buffer devices at relay nodes.On the other hand,reasonable allocation of wireless network resources can effectively improve the performance of wireless communication systems,so it is necessary to study resource allocation in wireless networks.This paper mainly studies the resource optimal scheduling strategy of two-way relay network.The specific research work and results are as follows:(1)This paper presents an energy-saving scheme for joint relay selection and power allocation under time division broadcasting protocol,which requires three slots to realize data interaction between end nodes.In the case of complete channel state information,the two-way relay network model of two end nodes and N parallel relay nodes is studied.Based on the data rate and the power non-negative constraints of two end nodes,the relay selection and power allocation are combined to minimize the total power consumption of the system.In the two relay signal combination technologies based on zero forcing(ZF)and variable gain(VG),the optimal relay node is selected according to the channel state,and then the power allocation of both end nodes and relay nodes is determined by the optimization problem,so that the total power consumption of the system is the lowest.The experimental results show that the time division broadcasting protocol has better energy-saving effect in two-way relay network.By setting reasonable data rate parameters,the power consumption of the system can be effectively reduced.(2)A throughput optimization scheme for joint bidirectional buffer-assisted relay system and birth-death(BD)Markov model is proposed,which considers the influence of buffer state and channel state on system performance.Both users canrandomly access a finite buffer on the relay node.Considering the relay environment of half-duplex decoding and forwarding,the effect of channel interrupt probability on buffer is analyzed.Then,based on the knowledge of BD Markov chain,the transmission probability of BD Markov process is analyzed,and the maximum throughput of the system at a fixed transmission rate is deduced according to the relevant mathematical theory.The experimental results show that the scheme is superior to other schemes in maximizing system throughput.