NR在60GHz定位过程的隐藏节点规避方法

Hidden Node Avoidance Method for NR Positioning at 60GHz

摘要:

60GHz非授权频段因其波长短、频段宽的无线传播特性可实现更高的定位信号测量精度，因此5G NR-U设备基于60GHz频段进行高精度定位倍受关注；但是由于5G网络是多网异构共存的，存在众多不同无线接入技术（RAT，radio access technology）的设备，潜在的隐藏节点多，即使5G NR-U设备采用先听后说（LBT，listen before talk）方式接入60GHz无线信道，仍无法有效规避隐藏节点，有时会严重干扰定位信号传输而影响定位性能；针对以上隐藏节点问题，文中提出对定位信号资源集中的多个定位信号资源分别配置不同的空间关系，接收端根据定位信号的测量结果实时动态调整其空间关系，尽可能多地规避潜在的隐藏节点；仿真验证结果表明所提方法可将定位信号的测量精度提升了约27%，显著降低定位误差。

Abstract:

The 60GHz unlicensed frequency band can achieve higher positioning signal measurement accuracy due to its wireless propagation characteristics of short wavelength and wide band; Therefore, 5G NR-U equipment for high-precision positioning based on the 60GHz frequency band has attracted much attention; However, 5G network is a multi-network heterogeneous coexistence system, which has many devices with different radio access technologies (RAT); Thus there are many potential hidden nodes in 60GHz band, even if 5G NR-U devices use listen before talk (LBT) to access 60GHz radio channel, they can not avoid hidden nodes effectively, which sometimes interfere with positioning signal transmission and affect positioning performance seriously; To solve the above hidden node issue, this paper proposes to configure different spatial relationships for multiple positioning signal resources in the positioning signal resource set, and the receiver dynamically adjusts their spatial relationships in real time according to the measurement results, so as to avoid potential hidden nodes as much as possible; Simulation results show that the proposed method can improve the measurement accuracy of the positioning signal by about 27% and significantly reduce the positioning error.