Packet Relay Assisted V2V Communication with Multiple Sectorized Relay Stations

Highly reliable vehicular communication is a key to the future automated driving. CSMA/CA packet relay-assisted schemes can improve reliability of ITS vehicle-to-vehicle (V2V) communications by compensating shadowing loss and fading. However, their performance is affected by hidden terminal (HT) problem. An improved relay-assisted V2V scheme employing a sectorized relay station (RS) was proposed to mitigate the problem and its effectiveness has been studied for intersection environment. However, effectiveness of the scheme with multiple RSs along a street has not been studied yet. This paper first analyzes the effect of HT problem on the relay-assisted V2V schemes with multiple RSs along a street, and shows that the sectorized RSs cooperate with each other to mitigate the problem and obtain diversity gain. Large-scale system simulations of 240 vehicles confirm that the relay-assisted scheme with sectorized RSs can achieve the highest reliability of V2V communications even in straight street scenario.

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