Traffic Statistics and Analysis of Transmitter in C-V2X Communication

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Traffic Statistics and Analysis of Transmitter in C-V2X Communication

Mingxi, Yang / Rundong, Yu / Yanheng, Liu / Yuming, Ge / Jian, Wang / Zhihan, Yao

In the communication of devices based on C-V2X, packet error rate (PER) is an important metric to measure the communication performance of a device. As for the packet loss phenomenon, we usually focus on why the receiver did not successfully receive the message, and rarely focus on whether the transmitter actually sent the message.We usually consider the messages sending situation recorded by the application layer as the messages that should be received by the receiver (packets that are known to be not sent by the application layer due to application layer congestion control, etc., are not in the scope of this paper). However, in the actual communication process, there are some discrepancies between the real packets sent from the bottom layer and the application layer's records. In the 2020 C-V2X Large-scale Pilot Demonstration, when we analyzed the results and calculated the received PER of the devices, we were confused whether some of the devices did not send all the packets successfully. Based on this confusion, we defined the concept of transmitter traffic to represent the actual packet sending situation of the device. We designed a method to calculate transmitter traffic by using the "large-scale" data available, and conducted statistics on the transmitter traffic of more than 40 terminal companies, more than 10 chip module companies, and more than 50 participating devices. We analyzed the statistical results, and analyzed the possible reasons for the unsuccessful transmitter traffic.