无源物联网技术探讨

Discussion on Passive IoT Technology

针对现有物联场景中RFID技术面临的通信距离受限、不支持连续组网和不支持定位三大技术挑战,提出了联合干扰抑制、极简空口协议栈设计、基于蜂窝网络的粗定位等无源物联关键技术。面向未来无源物联网的规模商用,提出两大端到端网络架构,以及7项无线网络架构。通过对CAT1-1/CAT1-2无源标签和CAT2半无源标签的链路预算评估得出,相比于其他的无线网络架构,半无源标签在蜂窝直连架构下的上下行均可以取得98 dB的链路预算,上下行覆盖能力平衡,验证了蜂窝直连架构可以作为网络部署的优选方案。

In view of the three major technical challenges faced by RFID technology in the existing IoT scenario, namely, limited communication distance, not supporting cellular network and not supporting positioning,it proposes several key technologies of passive IOT, such as joint interference suppression, design of simplified air interface protocol stack and rough positioning based on cellular network. For the deployment of passive IoT in the future,two kinds of end-to-end network architectures as well as seven kinds of radio access network architectures are proposed. By analyzing the link budget of CAT1-1/CAT1-2 passive IoT tag and CAT2 semi-passive IoT tag,it shows that semi-passive IoT tag can achieve 98 dB link budget for both uplink and downlink compared with other wireless network architecture. The balance between uplink coverage and downlink coverage is achieved,which confirms that the cellular based passive IoT architecture can be prioritized for future deployment.