车联网环境下的4G和DSRC异构网络切换机制研究  

Research on heterogeneous network switching mechanism based on 4G and DSRC in IoVs environment

作　　者：郑继亭[1,2] 胡锦超 李珺[1] 

机构地区：[1]长安大学信息与网络管理处,陕西西安710064 [2]长安大学信息工程学院,陕西西安710064

出　　处：《现代电子技术》2018年第1期105-111,共7页Modern Electronics Technique

基　　金：国家自然科学基金(51278058);陕西省自然科学基金(2012JM8011);中央高校基本科研专项基金(2013G1241111;2014G1321035)~~

摘　　要：面向车联网的实际应用需求,构建了一种高速公路环境下的基于4G和DSRC的异构网络通信场景。针对车辆在该场景下可能会在不同网络信道间频繁发生垂直切换导致较高的传输时延和丢包率的问题,在分析研究基于4G与DSRC的高速公路异构网络切换过程的基础上,引入网络跳数、连接次数和行驶轨迹作为切换判决条件,基于TREBOL路由协议设计了一种异构网络垂直切换算法。最后利用Veins仿真平台对提出的异构网络垂直切换算法的切换性能进行对比测试分析。测试结果表明,与基于RSSI的异构网络垂直切换方法相比,所提切换算法能增大车辆与DSRC网络连接的持续时间,并有效减少"乒乓效应"。According to the practical application requirements of Internet of Vehicles （IoVs）, a scenario of heterogeneous network communication based on 4G and DSRC was constructed for freeway. Since the frequent vertical switching of the channel between different networks may cause the high transmission delay and packet loss rate in the constructed scenario, the network hop count, connection frequency and traveling trajectory are introduced as the switching decision factors on the basis of the research on the switching process of the freeway heterogeneous network based on 4G and DSRC, and a vertical switching algorithm of heterogeneous network is designed on the basis of TREBOL routing protocol. The comparison test and analysis were carried out for the switching performance of the heterogeneous network vertical switching algorithm with Veins simulation platform. The test results show that, in comparison with the heterogeneous network vertical switching algorithm based on RSSI, the switching algo- rithm can prolong the duration time of the network connection between the vehicle and DSRC, and effectively weaken the pingpong effect.

关 键 词：车联网 高速公路 异构网络 垂直切换 第四代移动通信技术 专用短程通信 

分 类 号：TN915-34[电子电信—通信与信息系统]