摘要
作为低功率广域物联网新兴技术之一,窄带物联网(NB-IoT,narrow band Internet of things)面临着终端海量连接的压力和挑战。针对实际应用场景,提出一种Beta分布下的前导码分配方案,该方案首先计算各时隙设备能耗度,并按照平均能耗度和累计能耗度两种分组方式将设备划分为高能耗度设备组和低能耗度设备组,然后优先将前导码分配给高能耗度设备组,剩余前导码和高能耗度设备组冲突前导码分配给低能耗度设备组。仿真结果表明,与传统随机分配方案相比,所提方案能够有效提高NB-IoT系统平均接入成功率和平均吞吐量,同时能有效降低退避时间。
As one of the emerging technologies of low-power wide-area Internet of things,narrow band Internet of things(NB-IoT)faces the pressure and challenge of massive connections of terminals.Aiming at practical application scenarios,a preamble allocation scheme based on Beta distribution was proposed.In this scheme,the energy consumption of each time slot device was firstly calculated.The equipment was divided into high energy consumption according to two grouping methods:average energy consumption and cumulative energy consumption.The preamble was assigned to the high-energy-consuming device group first,and the remaining preamble and the conflicting preamble of the high-energy-consuming device group were assigned to the low-energy-consuming device group.The simulation results show that compared with the traditional random allocation scheme,the proposed scheme can effectively improve the average access success rate and average throughput of the NB-IoT system,and can effectively reduce the back off time.
作者
李梦雅
李正权
LI Mengya;LI Zhengquan(School of Internet of Things Engineering,Jiangnan University,Wuxi 214122,China)
出处
《物联网学报》
2021年第3期70-77,共8页
Chinese Journal on Internet of Things
基金
国家自然科学基金资助项目(No.61571108)
无锡市科技发展资金项目(No.H20191001,No.G20192010)
江苏省研究生科研与实践创新计划项目(No.SJCX20_0781)。
