基于终端分组的非正交随机接入资源分配方案

为了解决机器到机器(Machine to Machine,M2M)通信中的冲突碰撞、资源短缺等问题,提出了基于终端分组的非正交随机接入和数据传输(Non-Orthogonal Random Access and Data Transmission based on Terminal Grouping,TG-NORA-DT)方案。首先,根据能量消耗速度对机器类型通信设备(Machine Type Communication Devices,MTCDs)进行分组,并对组设定优先级,优先级高的组MTCDs优先分配接入资源。其次,利用到达时间的差异,识别出选择相同前导码的多个MTCDs,且在随后的接入过程中实现冲突MTCDs的功率复用。最后,基于TG-NORA-DT方案,提出一种资源分配方法,以实现在物理随机接入信道(Physical Random Access Channel,PRACH)和物理上行共享信道(Physical Uplink Shared Channel,PUSCH)间的资源合理分配。仿真结果表明,与正交随机接入数据传输协议(Orthogonal Random Access and Data Transmission Protocol,ORADTP)和非正交随机接入的数据传输(Non-Orthogonal Random Access-Data Transmission,NORA-DT)方案相比,TG-NORA-DT方案提高了系统吞吐量和资源利用率,降低了前导码冲突概率,其中资源利用率提高了20%以上。

Non-orthogonal Random Access Resource Allocation Scheme Based on Terminal Grouping

In order to solve the collisions,resource shortages and other problems in Machine to Machine(M2M)communication,a non-orthogonal random access and data transmission scheme based on terminal Grouping was proposed,i.e.TG-NORA-DT scheme.Firstly,the machine type communication devices(MTCDs)are grouped according to the speed of energy consumption,and the priority of the group is set.Secondly,the difference of arrival time is used to identify multiple MTCDs with the same preambles,and the power reuse of conflicting MTCDs is realized in the subsequent access process.Finally,based on the TG-NORA-DT scheme,a resource allocation method is proposed to reasonably allocate resources between the physical random access channel(PRACH)and the physical uplink shared channel(PUSCH).Simulation results show that compared with orthogonal random access and data transmission protocol(ORADTP)and Non-Orthogonal Random Access-Data Transmission(NORA-DT)scheme,TG-NORA-DT scheme improves system throughput and resource efficiency,and decreases the probability of preamble collisions.The resourse efficiency has increased by more than 20%.