| 基于SRS优先级划分及时移传输机制的SL空口同步方案 |
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| 引用本文： | 周晓勇,申滨,徐浪,黄晓舸.基于SRS优先级划分及时移传输机制的SL空口同步方案[J].电信科学,2018,34(12):1-9. |
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| 作者姓名： | 周晓勇 申滨 徐浪 黄晓舸 |
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| 作者单位： | 重庆邮电大学通信与信息工程学院移动通信重庆市重点实验室，重庆 400065 |
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| 摘 要： | 在LTE-V2X（long term evolution-vehicle to everything）系统中，存在部分车载用户无法获取基站的同步参考信号（synchronization reference signal，SRS），从而无法与网络进行通信的问题。为解决这一问题，提出一种副链接（sidelink，SL）空口同步方案。车载用户根据SRS优先级划分机制选择最优的SRS，同时可获取该SRS的优先级以及确定自身发送SRS的优先级；并设计SRS时移传输机制使得不同优先级SRS在不同时帧上传输来区分优先级，与此同时还可有效抑制同频干扰。仿真结果显示，该方案在同步源优先级为 4 个等级时，同步定时误差均满足车载用户的同步需求。本文所提方案不仅扩大了空口同步范围，还可以有效抑制车载用户之间的同频干扰，可作为LTE-V2X系统实现有效可行的空口同步方案之一。
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| 关 键 词： | LTE-V2X系统 SRS SL 优先级 时移传输机制 |
SRS prioritization and time-shift transmit mechanism based sidelink radio interface synchronization scheme |
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| Xiaoyong ZHOU,Bin SHEN,Lang XU,Xiaoge HUANG.SRS prioritization and time-shift transmit mechanism based sidelink radio interface synchronization scheme[J].Telecommunications Science,2018,34(12):1-9. |
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| Authors: | Xiaoyong ZHOU Bin SHEN Lang XU Xiaoge HUANG |
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| Affiliation: | Chongqing Key Laboratory of Mobile Communications,School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China |
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| Abstract: | For LTE-V2X system,acquiring the synchronization reference signal (SRS) is indispensable for vehicles to establish service connections in the network.However,there are some vehicles may not obtain the SRS and consequently fail to be synchronized with the network.In order to solve this problem,a sidelink (SL) radio interface synchronization scheme was proposed.Vehicles select an optimal SPS according to SRS priority division mechanism.The SRS are given different priorities,where the priorities of different synchronization sources can be distinguished in a time-shift based SRS transmit mechanism and meanwhile the interference among the SRS of different sources can be effectively suppressed.Simulation results illustrate that even when the synchronization source is assigned a priority of four,the synchronization error can still be satisfied the requirement.Compared with the conventional synchronization schemes,the proposed scheme supports an expanded synchronization range aided by synchronization over the SL and achieves mitigation of SRS interference with the time-shift based SRS transmit mechanism.The proposed scheme can serve as an efficacious and feasible solution for the LTE-V2X system. |
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| Keywords: | LTE-V2X system SRS SL prioritization time-shift transmit mechanism |
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