一种基于TA值比较的机器通信设备随机接入机制  

An Improved Random Access Mechanism for Machine Communication Devices Based on Timing Advance Value Comparison

作　　者：王晓春[1] 张军 WANG Xiaochun1,ZHANG Jun2(1. The 54th Research Institute of CETC,Shijiazhuang 050081,China;2. Jiangsu Key Laboratory of Wireless Communications,College of Telecommunications and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China)

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081 [2]南京邮电大学通信与信息工程学院江苏省无线通信重点实验室,江苏南京210003

出　　处：《无线电通信技术》2018年第6期573-578,共6页Radio Communications Technology

摘　　要：作为物联网关键技术之一的机器通信(Machine Type Communications,MTC)中包含了大量的MTC设备,如果这些大规模MTC设备直接接入到现有的无线接入网络,将会导致接入效率低、功率消耗大和丢包等问题。针对以上问题,提出了一种基于定时提前(Timing Advance,TA)值比较的改进型机器通信设备随机接入机制。这种机制在基于TA值比较的基础上,以"最大接入效率"为目标,根据接入设备数量的变化,动态地对前导资源进行分配和运用接入类别限制机制对接入设备数量进行控制,可以减少大规模接入时的冲突概率,并且能够保持相对较高的随机接入效率。As one of the key technology of Io T,the machine type communications（ MTC） contains huge amount of MTC devices.If these MTC devices are accessed into the current wireless access network,the problems may be caused,such as low access efficiency,high power consumption and packet loss. Aiming at the problems mentioned above,this paper proposes an improved random access mechanism based on timing advance（ TA） comparison,which aims to＂maximum access efficiency＂.According to the number changes of access devices,the leading resources are dynamically allocated and the number of access devices is controlled by access type limitation mechanism,thus the collision probability in large-scale wireless access can be reduced,and the relatively high random access efficiency can be maintained.

关 键 词：机器通信 TA值 接入控制 动态资源分配 随机接入效率 

分 类 号：TN915[电子电信—通信与信息系统]