Construction And Performance Test Of Wireless Communication Platform Based On 4G-LTE And WAVE

In the previous connected car researching, there is a lack of actual measurement of network performance. In this case, the paper designs and establishes a wireless communication platform in vehicular environment based on 4G-LTE and WAVE to measure the performance of networks and show the conclusions. The main work of this paper is as follows:1. On the basis of driving assistance, information releasing, free-flow ETC and other traffic requirement, the paper designs and organizes 46 traffic safety and non-safety applications based on vehicular network in three brand categories of communication mode. The objective requirements for the network load and the communication performance of the network are discussed for the applications. According to the characteristics of the application and the network requirements, combining the features of the existing mainstream wireless bearer networks, 4G-LTE and WAVE are chosen as the bearer network for the application of connected cars.2. The paper designs and establishes the wireless communication platform based on 4G-LTE and WAVE. For the characteristics of communication between terminal and base station in 4G-LTE and ad hoc structure of WAVE, the testing softwares are designed and developed. The testing softwares can match the measured data with the location and movement information of network terminals and record, to obtain the different state of motion by 4G-LTE and WAVE communication performance of different vehicle environment of network performance test.3. On the basis of studying on 4G-LTE performance characteristics, combining with demand of connected car communication, the paper analysises the advantages of 4G-LTE application on the traffic information releasing, such as extensive range of emplacement, IP-online forever, etc; and shortages, such as poor multicast capability etc. Aiming at these problems, combined with the experimental conditions, the paper designs and finishes the test in poor signal area under the antenna, signal shielding area and interference between stations / cell switching area on 4G-LTE transmission delay and throughput. The conclusions of the experiment are as follows: 4G-LTE is suitable for the application of Internet accessing and other traffic information releasing, such as entertainment applications and transportation information service.4. On the basis of studying on WAVE performance characteristics, combining with demand of connected car communication, the paper analysises the advantages of WAVE application on the vehicle infrastructure cooperative safety applications, such as low packet error rate, overcoming the fast fading effectively, etc; and shortages, such as BBS problem, hidden terminal problem, etc. Aiming at these problems, combined with the experimental conditions, the paper designs and finishes the test by following, crossing and relative motion on WAVE transmission delay and throughput. The conclusions of the experiment are as follows: WAVE is suitable for the traffic safety application with low throughput and high time delay demands.This paper intergrate all works above. According to the actual test on 4G-LTE and WAVE in vehicular environment, the paper analysises the performance data. It is proved that 4G-LTE and WAVE in the hehicle heterogeneous network have their own advantages and functions.