刘洋， 刘培植^*

（  北京邮电大学信息与通信工程学院,北京 100876；  ）

摘要： LTE的后期演进技术（LTE-A）由于其高速、大容量、低时延以及其它特性,对车联网通信起到很好的支撑作用。但是对高速路这一时延敏感的特殊车联网系统而言,LTE-A系统中信号的周期性传输导致了高速路通信中无法容忍的时延问题。为了优化这种时延,本文提出了一种分布式的用户配对协议。这个协议需要身处同一车联网环境下的车辆广播自己的位置,基站将根据特定的准则为它们分组,这就是用户配对过程。为了最小化时延,不同组内的车辆可以占用同一时隙广播自己的信息。之后的数据分析表明在同样的发现概率的情况下,时延减少了60%。
关键词： 信号与信息处理；LTE-A；车联网；用户配对。

LIU Yang， LIU Pei-Zhi^*

（  School of Information and Communication Engineering, Beijing University of Posts and Telecommunications (BUPT), Beijing 100876；  ）

Abstract： Long Term Evolution-Advanced (LTE-A) technology provides a good support for vehicle networking communication because its high speed, large capacity, low delay and other characteristics. But for the highway, which is sensitive to delay,the periodic transmission of the beacon in the LTE-A system leads to an intolerable delay. To optimize the delay, this paper improve a distributed peer discovery protocol. The proposed protocol requires vehicles to advertise their presence, and Evolved NodeB (eNB) divides them into clusters following a certain rule, which we called peer discovery. In order to minimize delay occupancy, vehicles in different groups broadcast their information on the same slot. Our numerical analysis indicates that under the same discovery probability, the delay is reduced by 60%.
Keywords： Signal and Information Processing; Long Term Evolution-Advanced (LTE-A); vehicle networking; peer discovery.