摘要
为了实现万物互联,6G蜂窝物联网需要提供低功耗、巨连接和广覆盖的无线接入。通过对6G物联网中大规模接入技术的分析和研究,特别是结合物联网业务的偶发特性,设计了一个基于免授权随机接入协议的新型接入架构,以促进在有限频谱资源内实现高效的大规模接入。所提接入架构包括两个阶段,即联合激活检测与信道估计、数据传输。根据数据传输方向的不同,可以分为上行数据传输和下行数据传输两种方案。由于大规模免授权随机接入情况下基站获取的信道信息具有不确定性,同时考虑6G物联网设备的低功耗需求,因此,两种方案都以系统能量效率为优化目标,分别设计了稳健的接入算法。仿真结果证明了所提方案的有效性和稳健性。
To realize Internet of everything(IoE),the 6 G cellular Internet of things(IoT)network need to provide wireless access with low power,massive connectivity and wide coverage.Through the analysis and research on the massive access technology in 6 G cellular IoT network,especially in combination with the sporadic characteristics of IoT applications,a new access framework based on the grant-free random access protocol was designed to facilitate efficient massive access with limited spectrum resources.The proposed framework consisted of two phases.One was joint activity detection and channel estimation.The other was data transmission,which was divided into two categories,uplink data transmission and downlink data transmission,according to the different directions of data transmission.Due to the uncertainty of channel state information at the base station under the massive grant-free random access and considering the low power demand of 6 G IoT devices,two robust uplink and downlink access algorithms were designed by maximizing the system energy efficiency.Extensive simulation results validate the effectiveness and robustness of the proposed algorithm.
作者
田飞燕
陈晓明
钟财军
张朝阳
Feiyan TIAN;Xiaoming CHEN;Caijun ZHONG;Zhaoyang ZHANG(College of Information Science and Electronic Engineering,Zhejiang University,Hangzhou 310027,China)
出处
《物联网学报》
2020年第1期92-103,共12页
Chinese Journal on Internet of Things
基金
国家重点研发计划资助项目(No.2018YFB1801104)
国家自然科学基金资助项目(No.61725104,No.61871344,No.61922071).
关键词
6G
蜂窝物联网
大规模接入
能量效率
低功耗
巨连接
广覆盖
6G
cellular Internet of things
massive access
energy efficiency
low power
massive connectivity
wide coverage
