利用上行参考信号循环移位的往返时间估计
Round Trip Time Estimation Utilizing Cyclic Shift of Uplink Reference Signal
AI总结：
针对5G NR中基站无法直接获取绝对上行信道冲激响应以估计往返时间的问题，提出基于新型ZC序列宽带上行参考信号循环移位的RTT估计方法，可降低开销与时延，且经OAI真实测试平台验证有效。
摘要：
在第五代新空口（5G NR）技术背景下，基站（gNB）无法直接从用户设备（UE）获取绝对上行（UL）信道冲激响应（CIR）。通过探测参考信号（SRS）获取的UL CIR始终会因UE端应用的定时提前量（TA）而产生时移。TA对维持上行同步至关重要，若不施加TA就传输SRS则会产生干扰。本研究提出了一种新方法，可从UE获取绝对UL CIR，进而在gNB端估计往返时间（RTT）。该方法需要对现有5G协议栈进行增强，引入一种新的基于Zadoff-Chu（ZC）序列的宽带上行参考信号（URS）。利用URS序列的循环移位特性，与现有方案相比，我们能以显著降低的开销和时延获取RTT。研究采用基于OpenAirInterface（OAI）的真实测试平台对所提方法进行了实验验证。
英文摘要：
In the context of fifth-generation new radio (5G NR) technology, it is not possible to directly obtain an absolute uplink (UL) channel impulse response (CIR) at the base station (gNB) from a user equipment (UE). The UL CIR obtained through the sounding reference signal (SRS) is always time-shifted by the timing advance (TA) applied at the UE. The TA is crucial for maintaining UL synchronization, and transmitting SRS without applying the TA will result in interference. In this work, we propose a new method to obtain absolute UL CIR from a UE and then use it to estimate the round trip time (RTT) at the gNB. This method requires enhancing the current 5G protocol stack with a new Zadoff-Chu (ZC) based wideband uplink reference signal (URS). Capitalizing on the cyclic shift property of the URS sequence, we can obtain the RTT with a significant reduction in overhead and latency compared to existing schemes. The proposed method is experimentally validated using a real-world testbed based on OpenAirInterface (OAI).
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
