基于NOMA系统强用户URLLC最优资源分配研究

Optimal resource allocation for strong user in URLLC based on NOMA

为满足强用户URLLC传输和提高系统解码效率,提出利用弱用户信息混合编码方式进行传输。进一步利用最优资源分配构建满足弱用户最小服务质量(QoS)需求下的最大化强用户有效吞吐量优化方程,采用近似分析求解获得最优功率分配策略和强用户最优传输块长度。仿真结果验证了近似分析的可行性,以及NOMA相对传统的正交多址接入(OMA)传输方式的优越性;在有限总发射功率情况下,最优有效吞吐量随着发射功率的增大而增大;发射功率增大到一定值时,系统性能将趋于稳定,与传输块长度无关。

In order to meet the strong user URLLC transmission and improve the system decoding efficiency,we proposed based on the weak user hybrid encoding method for information transmission.The optimal resource allocation is used to construct an optimization equation for maximizing the effective throughput of strong users under the minimum quality of service(QoS)requirements of weak users,and approximate analysis is used to obtain the optimal power allocation strategy and the optimal transmission block length.The simulation results verify the feasibility of the approximate analysis and the superiority of NOMA over the traditional orthogonal multiple access(OMA)transmission method;in the case of limited total transmission power,the optimal effective throughput increases with the increase of the transmission power.However,when the total transmit power increases to a certain value,the system performance will tend to be stable and regardless of the length of the transmission block.