Research On Local Delay And Energy Efficiency In Heterogeneous Based On Decoupled Uplink And Downlink Access

The widespread adoption of 5G has made the Internet of Thing possible,massive amounts of access devices have led to explosive growth in wireless mobile data traffic,and the rapid popularity of online games,cloud storage and short video services in the context of the global push for economic digitalization has brought increasing attention to the performance of uplink transmission.On the other hand,heterogeneous networks have been applied in the construction of 5G networks,aiming to further improve the throughput of wireless networks.However,constrained by the traditional user association mode of uplink and downlink coupling access(CUDA),the uplinking transmission performance of users under heterogeneous networks has reached a bottleneck,which cannot meet the performance requirements of future mobile communications.To solve this problem,this paper mainly uses the uplink and downlink decoupled access(DUDA)strategy,and based on the base station location distribution model of Poisson point and Poisson cluster process,to study the local delay and energy efficiency performance improvement of uplinking transmission of users in heterogeneous networks.In view of the characteristics of heterogeneous networks,this paper proposes a user uplinking transmission association scheme based on DUDA mode,deduces the expression of probability density function of user base station association probability and association distance,and calculates the load of base station and average user association distance.Compared with the CUDA,it is found that in the heterogeneous network,the load of the base station adopting the DUDA scheme is balanced,the average user association distance is reduced,and the DUDA mode is beneficial to the performance improvement of the uplinking transmission system.Based on Poisson Point Process(PPP),this paper established the analysis model of heterogeneous network interference,using random geometry tool simplifies the calculation of user successfully transmission probability(STP)in the heterogeneous network,local delay is deduced and the expression of energy efficiency,and simulates and analyses the effect of threshold,the density of micro base station and power compensation coefficient on the performance of heterogeneous networks.At the same time,some significant conclusions are summarized.For example,compared with the CUDA mode,the local delay in the DUDA mode is lower,the system energy efficiency is higher,and the decoupled access mode can solve the problem of energy efficiency reduction caused by the use of power compensation strategy.Considering the difference between the PPP and the actual base station distribution,this paper establishes the time delay and energy efficiency analysis model based on the PCP,and deduces the user's STP under the PCP.This paper simulates and analyses the effect of signal to stem ratio threshold,the density of micro-base stations and the average number of cluster base stations on local delay and energy efficiency under the two modes of CUDA and DUDA.The results show that in the PCP,the decoupled access mode is still more advantageous than the decoupled access mode.It is also verified that compared with the PPP,the DUDA mode has a more obvious reduction in local delay and a more significant improvement in energy efficiency in the heterogeneous network based on the PCP.