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.