LTE-V2X车联网技术、标准与应用

doi:10.11959/j.issn.1000-0801.2018140

Abstract

Abstract:

V2X (vehicle to everything) communication is the critical technology to provide environment sensing,information exchange and cooperative control capabilities in vehicular networks.LTE-V2X,as one of the major V2X communication standards initiated and mainly driven by Datang Telecom,can enable low latency,high reliability,high data rate and security in communications,as well as scale economies by sharing the existing LTE network and terminal chipsets.LTE-V2X communication technology was introduced,and compared with IEEE 802.11p standards.Then,the progress of LTE-V2X standardization,industrial research and development and trials and field testing works were provided.Finally,the development strategy of LTE-V2X and technical evolution towards 5G was discussed.

Key words: vehicular network, LTE-V2X, IEEE 802.11p, standard, trial and application

CLC Number:

TP393

Shanzhi CHEN,Jinling HU,Yan SHI,Li ZHAO. Technologies,standards and applications of LTE-V2X for vehicular networks[J]. Telecommunications Science, 2018, 34(4): 1-11.

Figures/Tables 6

References 24

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	DSRC	LTE-V2X	LTE-V2X技术优势
物理层处理	信道编码卷积码	Turbo码	Turbo码的编码增益可在相同传输距离下获得更高的可靠性，或在相同可靠性下传输距离更远
	重传不考虑重传	通过HARQ（hybrid automatic repeat request）机制进行多次重传	重传合并增益可提高可靠性
	波形OFDM（orthogonal frequency division multiplexing）	SC-FDMA（single-carrier frequencydivision multiple access）	PAPR（peak to average power ratio）影响更小，在相同功放情况下可有更大的发射功率
	信道估计信道估计算法需改进以支持高速场景	4列DMRS	4列DMRS参考信号有效支持高速场景
	接收分集不是必须的	两个接收天线考虑接收分集处理	充分利用接收分集增益
资源分配机制	资源复用TDM	TDM/FDM	采用 TDM 和 FDM，考虑了节点密度、业务量和低时延高可靠传输需求
	资源选择机制CSMA/CA	感知+SPS	充分考虑业务周期性，可充分利用感知结果避免产生资源冲突
	资源感知通过固定门限以及检测前导码来判断信道是否被占用	通过功率和能量测量感知资源占用情况	考虑业务优先级对资源选择的影响，并且功率和能量测量提供资源感知结果供资源选择使用
同步	同步方式非同步方式	同步方式	采用同步方式降低信道接入开销，提高频谱利用率

Technologies,standards and applications of LTE-V2X for vehicular networks

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