IEEE802.11p protocol based vehicle-to-roadside and vehicle-to-vehicle communication test methods oriented to the internet of vehicles

Patent metadata

Field	Value
Publication number	US-10652074-B2
Application number	US-201816226037-A
Country	US
Kind code	B2
Filing date	Dec 19, 2018
Priority date	Dec 28, 2017
Publication date	May 12, 2020
Grant date	May 12, 2020

Abstract

An IEEE 802.11p protocol-based vehicle-to-roadside and vehicle-to-vehicle communication test method oriented to the Internet of Vehicles. The method includes: driving a host vehicle and a target vehicle at a same speed on a road segment; the host vehicle being located behind the target vehicle; a constant distance is maintained between the host vehicle and the target vehicle; the host vehicle is equipped with a host vehicular communication unit, the target vehicle is equipped with a target vehicular communication unit communicating with the host vehicular communication unit; calculating a throughput and a round trip time RTT from the target vehicular communication unit to the host vehicular communication unit; repeating driving the host vehicle and target vehicle N times, and calculating an average throughput and an average round trip time (RTT) of the N times; and calculating a network performance parameter η according to the average throughput and the RTT.

First claim

What is claimed is:

1. An IEEE 802.11p protocol-based vehicle-to-vehicle communication test method oriented to the Internet of Vehicles, comprising the following steps:
step 1: randomly selecting two vehicles, wherein one vehicle is a host vehicle, the other vehicle is a target vehicle, the host vehicle and the target vehicle are driven at a same speed per hour on a road segment L, the host vehicle is located behind the target vehicle, a constant distance is maintained between the host vehicle and the target vehicle, the host vehicle is equipped with a host vehicular communication unit, the target vehicle is equipped with a target vehicular communication unit, and the host vehicular communication unit and the target vehicular communication unit are capable of communicating with each other using the vehicular communication units;
step 2: calculating a throughput and a round trip time RTT from the target vehicular communication unit to the host vehicular communication unit;
step 3: driving the host vehicle and the target vehicle on the road segment L for N times, and calculating an average throughput and an average round trip time RTT of the N times; and
step 4: calculating a network performance parameter η using an equation (1) according to the average throughput and the average round trip time RTT that are obtained through calculation in the foregoing step:

η
=

A
⁢

⁢
T

800
⁢

⁢
KBps

×
0.35

+

10
⁢

⁢
ms

R
⁢

⁢
T
⁢

⁢
T

×
0.65

;

(
1
)

and
if η≥0.9, considering that IEEE 802.11p protocol-based wireless network performance of the Internet of Vehicles is excellent;
if 0.75≤η<0.9, considering that IEEE 802.11p protocol-based wireless network performance of the Internet of Vehicles is good;
if 0.6≤η<0.75, considering that IEEE 802.11p protocol-based wireless network performance of the Internet of Vehicles is moderate; or
if η<0.6, considering that IEEE 802.11p protocol-based wireless network performance of the Internet of Vehicles is poor.

2. The IEEE 802.11p protocol-based vehicle-to-vehicle communication test method oriented to the Internet of Vehicles according to claim 1 , wherein calculating an average throughput from the target vehicular communication unit to the host vehicular communication unit comprises:
step 21: sending, by the host vehicular communication unit, a throughput test request data packet to the target vehicular communication unit, and starting a timer with 1 s as a period;
step 22: after receiving the throughput test request data packet, returning, by the target vehicular communication unit, a UDP data packet continuously, and persisting for 4 s, wherein the UDP data packet comprises a location of the target vehicle and driving status information; and
step 23: recording, by the host vehicular communication unit, UDP data packets received in every 1 s period, persisting for three periods, and calculating a throughput of a unidirectional link from the target vehicular communication unit to the host vehicular communication unit according to a quantity of bytes of UDP data packets received in a second period.

3. The IEEE 802.11p protocol-based vehicle-to-vehicle communication test method oriented to the Internet of Vehicles according to claim 1 , wherein calculating a round trip time RTT from the target vehicular communication unit to the host vehicular communication unit comprises:
step 24: sending, by the host vehicular communication unit, an ICMPv6 data packet to the target vehicular communication unit at an interval of 0.1 s cyclically, persisting for 3 s, and recording a sending time sequence T_Send[i] of sending the ICMPv6 data packet, wherein i=1, 2, . . . , 30;
step 25: after receiving the ICMPv6 data packet, returning, by the target vehicular communication unit, an ICMPv6 response data packet;
step 26: recording, by the host vehicular communication unit, a receiving time sequence T_Receive[j] of receiving the ICMPv6 response data packet from the target vehicular communication unit, where j=1, 2, . . . , 30; and
step 27: when the response data packet is unreachable or times out, setting the corresponding sending time sequence T_Send[i] and the receiving time sequence T_Receive[j] to 0, wherein i=j, increasing a failure count by 1, and calculating the round trip time RTT according to an equation (3), wherein

R
⁢

⁢
T
⁢

⁢
T

=

∑

i
=

j
=
1

30

⁢

⁢

(

T_Receive
⁡

Assignees

• Changan Univ

Inventors

• Zhao Xiangmo
• Wang Runmin
• Xu Zhigang
• Deng Xiaofeng
• Zhu Yu
• Liu Zhanwen
• Li Dongwu
• Sun Pengpeng
• Chen Ting
• Yang Lan

Classifications

• H04L43/0864

  Round trip delays · CPC title

• H04W4/44

  for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H] · CPC title

• H04W24/06 Primary

  Testing, {supervising or monitoring} using simulated traffic · CPC title

• H04L43/0888

  Throughput · CPC title

• H04L67/12

  specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks · CPC title