基于SRS优先级划分及时移传输机制的SL空口同步方案

doi:10.11959/j.issn.1000-0801.2018289

Abstract

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.

Key words: LTE-V2X system, SRS, SL, prioritization, time-shift transmit mechanism

CLC Number:

TN929.5

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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References 18

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参数	数值
基站覆盖范围	2 000 m
车载用户通信范围	200 m
基站发送功率	46 dBm
车载用户发送功率	24 dBm
信噪比阈值a₁/a₂	5 dB/10 dB
车载用户移动速度	40~70 km/h
DL帧结构	常规CP
SL帧结构	常规CP
带宽	10 MHz
载波频率	2 GHz
同步周期	10 ms
噪声功率密度	-174 dBm/Hz

SRS prioritization and time-shift transmit mechanism based sidelink radio interface synchronization scheme

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