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A Vehicle Location Method Based on Protocol Cross-layer Optimization

A cross-layer optimization and vehicle positioning technology, which is applied in the field of Internet of Vehicles communication, can solve the problems affecting the measurement accuracy of signal flight time, the decrease of positioning accuracy, and the retransmission of data frames, etc., and achieve the effect of flexible position reference nodes and high positioning accuracy

Active Publication Date: 2018-07-13
GUANGDONG MECHANICAL & ELECTRICAL COLLEGE
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  • Abstract
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AI Technical Summary

Problems solved by technology

Because the collision will cause the retransmission of the data frame, the time spent waiting for the retransmission will affect the measurement accuracy of the signal flight time, resulting in a decrease in positioning accuracy

Method used

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  • A Vehicle Location Method Based on Protocol Cross-layer Optimization
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  • A Vehicle Location Method Based on Protocol Cross-layer Optimization

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Experimental program
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Effect test

Embodiment

[0055] In an ideal communication environment, according to the OSS-TWR positioning algorithm, the signal flight time t p The calculation is as shown in (1.1), and multiplied by the propagation speed of radio waves, the distance D from the vehicle to the RSU can be obtained.

[0056]

[0057] t roundA is the round-trip flight time of the wireless signal between the vehicle and the RSU; t replyB To locate the processing time of the data packet at the RSU end (timed with the clock system of the RSU); t waitA is the processing time of recording the positioning data packet at the RSU end under the clock system of the vehicle; t waitA =f(t replyB ), f is a mapping function, which represents the mapping relationship between the two clock systems. But in complex network environment, OSS-TWR will be affected.

[0058] In the communication network with collision and the ideal communication network, t roundA and t waitA is inconsistent, in an ideal network, t roundA and t wai...

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Abstract

The invention discloses a vehicle positioning method based on protocol cross-layer optimization, and the method comprises the following steps: S1, determining a channel and frame structure, wherein V2V communication employs the DSRC (dedicated short range communication) technology according with the IEEE802.11p WAVE standard, thereby achieving the vehicle-road and vehicle-vehicle bidirectional communication, transmitting voice and data information in real time, and enabling the vehicles to be organically connected with vehicles and roads; S2, recording back-off time through employing a back-off algorithm TRB; S3, reducing the probability of network collision and time delay caused by retransmission of statistic data through employing a dedicated communication channel, requesting a nearby RSU for providing position reference through employing an enhanced OSS-TWR positioning communication protocol and a vehicle periodic broadcast positioning request data frame 'Req', and completing the self-positioning through measuring the distance with the RSB. The method irons out the defects of a satellite positioning system, and a vehicle can estimate the position by itself through a ground base station (RSU), especially in a region where GPS loses efficacy. Therefore, the method is of great significance to the automatic driving and active safe application of the vehicle.

Description

technical field [0001] The invention relates to the research field of vehicle networking communication, in particular to a vehicle positioning method based on protocol cross-layer optimization. Background technique [0002] With the continuous advancement of related technologies of the Internet of Vehicles, more and more applications of the Internet of Vehicles based on Location Based Service (LBS) have been gradually promoted, such as the identification of friend or foe and location coordination of military vehicles, and the supervision of bank cash transport vehicles. Through the DSRC communication technology, the vehicle can also realize self-positioning in special environments such as the city center with many high-rise buildings or tunnels, so that the supervision is truly seamless. Similarly, other location-based services such as precise advertising promotion, urban intelligent parking guidance system, urban intelligent transportation system, etc. also require self-pos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W4/021H04W4/44H04W4/46G01S19/48
CPCG01S19/48
Inventor 刘建圻万加富张严林
Owner GUANGDONG MECHANICAL & ELECTRICAL COLLEGE