计算机科学 ›› 2020, Vol. 47 ›› Issue (4): 243-248.doi: 10.11896/jsjkx.190300410
张继荣, 贾晨晴
ZHANG Ji-rong, JIA Chen-qing
摘要: 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。
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