Design And Performance Analysis Of System-level Simulation Platform Based On Non-orthogonal Multiple Access

In order to meet the demand of emerging services for wireless network spectral efficiency and system capacity,and support more and more user terminal access,the industry has proposed non-orthogonal multiple access(NOMA).Among them,the multi-user shared access(MUSA)proposed by ZTE can effectively reduce signaling overhead and delay by means of code domain spread spectrum,which has a good application prospect in the scenario of Internet of Things using small data packet transmission.MUSA has more related research at the link level.However,system-level networking performance based on MUSA is affected by many factors,and there is an urgent need to study and evaluate its corresponding networking performance in indoor and outdoor scenarios and different scheduling methods.For this reason,this paper studies the system-level network performance of MUSA.First,considering the lack of simulation tools for network performance evaluation,this paper builds a 5G system-level simulation platform based on MUSA.After that,based on the system-level simulation platform,the performance of MUSA and orthogonal frequency division multiple access(OFDMA)is compared.Finally,an improved user grouping strategy is proposed based on the performance simulation of MUSA based on grant-free and grant-based scheduling,which can effectively improve network performance.The main work and innovation of this article are as follows.1.Design and build a 5G system-level simulation platform based on MUSA.The initialization module,time promotion module,base station module and user module of system level platform are developed.Algorithms for calculating coupling loss,access control,power control,grant-free and grant-based scheduling modes of MUSA,and successive interference cancellation at the receiving are implemented in the simulation platform.2.Based on the system-level simulation platform the system performance of MUSA technology and OFDMA technology in urban macro-cell,urban micro-cell and indoor hotspot scenarios is analyzed and simulated.Specifically,the coupling loss and signal to interference radio of the system-level simulation platform under three scenarios are simulated according to the 3 GPP standard,and calibrates the simulation results with different manufacturers to verify the accuracy of the simulation platform.Then,the packet drop rates of MUSA and OFDMA technologies are simulated in three scenarios.The simulation results show that MUSA can support higher business load than OFDMA in all three scenarios,which can increase the packet arrival rate by almost 80%when the packet loss rate is 1%in urban macro-cell and urban micro-cell.3.Aiming at the problem that traditional MUSA based on grant-free scheduling would cause multi-user signature collision,a MUSA user group scheduling method based on grant-based scheduling is proposed.Simulation results show that the average throughput of the base station with the proposed improved grouping strategy can be improved by approximately 15%and 134%compared with the grouping strategy based on coupling loss and the grant-free scheduling mode.This work provides theoretical and technical support for the promotion of MUSA technology for 5G and Beyond-5G systems,and provides performance references for MUSA standardization and practical industrial applications.